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  • 2022.05.24

    Solutions to common problems in die stamping

    What are the reasons for the blockage of chips in die stamping parts, and what countermeasures should be taken?The reasons and corresponding countermeasures for the blockage of chips in stamping parts are as follows: 1) The leakage hole is too small, the gap of the leakage hole can be increased; 2) The leakage hole is too large, the scrap material rolls, and the leakage hole is re-modified; 3) The knife edge is worn and the burr is large, and the knife edge needs to be trimmed;  4) The oil dripping is too fast and the oil is sticky. You can control the amount of oil dripping and change the oil type;  5) The surface of the straight blade of the concave die is rough, and the powder is sintered and attached to the blade, and the surface roughness can be reduced or the material can be changed by surface treatment and polishing; 6) The material is soft, modify the blanking gap;The emergency measures are: trim the end face of the punch blade with a slope or arc (pay attention to the direction), use a vacuum cleaner, and blow air at the blanking hole of the backing plate.What are the reasons for the variation of the blanking offset size during die stamping?What countermeasures should be taken? The main reasons for the variation of blanking offset size and the corresponding countermeasures are:  1) The knife edge of the convex and concave die is worn, resulting in burrs (the shape is too large, the inner hole is too small), and the knife edge needs to be repaired; 2) Improper design clearance, modify the design and control the machining accuracy; 3) If the punch and die inserts at the blanking level are offset and the gap is uneven, the position accuracy and blanking gap can be adjusted; 4) If the guide pin is worn and the pin diameter is insufficient, the guide pin can be replaced; 5) If the guide is worn, the guide post and guide bush can be replaced;  6) The feeding distance of the feeder is not properly adjusted for the release of the pressing material, and the feeder is re-adjusted; 7) Improper adjustment of the mold closing height, re-adjust the closing mold height; 8) The stripping inserts are worn out, there is no pressing (strong pressure) function or the punching is small due to the material pulling and turning over) the stripping inserts can be ground or replaced, the strong pressure function can be increased, and the pressing materials can be adjusted; 9) The strong pressure of the stripping insert is too deep, the punching hole is too large, and the die needs to be adjusted to reduce the strong pressure depth; 10) If the mechanical properties of stamping materials vary (unstable strength and elongation), it is necessary to replace the material and control the quality of the feed; 11) The punching force causes the dimensional variation of the material traction. The end face of the punch blade can be trimmed with a slope or arc to improve the force condition during punching, or a guide function can be added to the blanking part on the stripping insert.Suzhou Huihong Electric Co., Ltd. is a professional manufacturer of precision molds ,Auto parts Mould, assembling and silk-printing. Some moulds are exported to Japan, Europe and the United States. We have the right to import and export the goods. We can develop and manufacture the moulds according to the needs of our customers. We pay attention to quality control, new project development, personnel training, team spirit. In recent years, we have established long-term business relationships with many well-known enterprises at home and abroad.

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  • 2022.05.20

    Types of auto parts

    The basic unit that constitutes each part of a vehicle for transportation, also called auto parts, or auto parts for short, is mainly composed of the following parts:Engine auto partsThrottle body, engine, engine assembly, oil pump, nozzle, tensioner, cylinder block, bearing bush, water pump, fuel injection, gasket, camshaft, valve, crankshaft, connecting rod assembly, piston, belt, muffler, chemical Oil tank, oil tank, water tank, fan, oil seal, radiator, filterDrivetrain Auto PartsTransmission, gear shift lever assembly, reducer, clutch, pneumatic, power tools, magnetic materials, electronic components, clutch disc, clutch cover, universal joint, universal ball, universal ball, ball cage, clutch disc , transfer case, power take-off, synchronizer, synchronizer ring, timing belt, differential, differential case, differential disc angle teeth, planetary gear, wheel carrier, flange, gearbox, intermediate shaft, Gear, lever fork, drive shaft assembly, drive shaft flangeBrake system auto partsBrake shoes, brake pads, brake disc, brake drum, compressor, brake assembly, brake pedal assembly, brake master cylinder, brake wheel cylinder, ABS-ECU controller, electric hydraulic pump, brake camshaft, Brake roller, brake tellurium pin, brake adjustment arm, brake chamber, vacuum booster, hand brake assembly, parking brake assembly, parking brake lever assemblySteering auto partsKingpin Steering Gear Knuckle Ball Pin ...Walking accessoriesRear axle, air suspension system, balance weight, steel plate, tire, leaf spring, half shaft, shock absorber, steel ring assembly, half shaft bolt, axle housing, frame assembly, wheel base, front axleElectrical instrument accessoriesSensors, car lamps, buzzers, spark plugs, batteries, wiring harnesses, relays, audio, alarms, regulators, distributors, starters (motors), one-way devices, car meters, switches, insurance sheets, glass regulators, Generator, ignition coil, ignitercar lampsDecorative lights, headlights, searchlights, ceiling lights, anti-fog lights, instrument lights, brake lights, tail lights, turn signals, emergency lightsCar modificationTire pump, car roof rack, car roof box, electric winch, car buffer, sunroof, sound insulation material, bumper, fixed wind wing, fender, exhaust pipe, fuel saverSecurity anti-theftSteering wheel lock, wheel lock, anti-theft device, rear view mirror, rear view system, camera, seat belt, driving recorder, central control lock, GPS, ABS, reversing radar, gear lockAutomotive interiorCar carpet (foot pad) Steering wheel cover Steering wheel power ball Curtain, sun gear ...automotive exteriorWheel cover Body color sticker License plate holder Weather...Comprehensive auto partsAdhesives, Sealants Vehicle Tools Auto Springs Plastic Parts ...Audio and video appliancesTire Pressure Monitoring System Decoder Display Vehicle Intercom ...Chemical CareCoolant Brake Fluid Antifreeze Lubricant ...Body and accessoriesWipers Auto Glass Seat Belts, Airbags Dashboards ...Maintenance equipmentSheet metal equipment Purification system Tire changer Corrector ...electrical toolsElectric punching shears Heat gun Electric jack Electric wrenchSuzhou Huihong Electric Co., Ltd.is a professional manufacturer specialized in precision molds, injection molding, assembling and silk-printing. Chinese OEM Plastic Injection Mould Manufacturers and Plastic Mold Factory. Some moulds are exported to Japan, Europe and the United States. We have our own goods and factories so we can develop and produce the moulds according to the needs of our customers.

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  • 2022.05.09

    The structure of the injection mold

    The structure of the injection mold Although the structure of the mold may vary due to the variety and performance of plastics, the shape and structure of plastic products, and the type of injection machine, the basic structure is the same. The mold is mainly composed of pouring system, temperature regulation system, forming parts and structural parts. Among them, the gating system and the molding parts are the parts that are in direct contact with the plastic, and change with the plastic and the product. They are the most complex and most variable parts in the mold, and require the highest processing finish and precision. The injection mold consists of a movable mold and a fixed mold. The movable mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic product. In order to reduce the heavy workload of mold design and manufacturing, most of the injection molds use standard mold bases. Gating system The gating system refers to the part of Charger top cover mold Plant the runner before the plastic enters the cavity from the nozzle, including the main runner, the cold material hole, the runner and the gate. The gating system is also called the runner system. A set of feeding channels to the cavity, usually composed of a main channel, a branch channel, a gate and a cold material cavity. It is directly related to the molding quality and production efficiency of plastic products Mainstream It is a passage in the mold that connects the injection nozzle of the injection molding machine to the runner or cavity. The top of the sprue is concave for engagement with the nozzle. The inlet diameter of the main channel should be slightly larger than the diameter of the nozzle (0.8mm) to avoid overflow and prevent the two from being blocked due to inaccurate connection. The diameter of the inlet depends on the size of the product, generally 4-8mm. The diameter of the sprue should be expanded inward at an angle of 3° to 5° to facilitate the release of the runner debris. cold slug It is a cavity at the end of the main channel to capture the cold material generated between two injections at the end of the nozzle, thereby preventing the blockage of the runner or gate. If the cold material is mixed into the cavity, internal stress is easily generated in the manufactured product. The diameter of the cold material hole is about 8-10mm and the depth is 6mm. In order to facilitate demoulding, the bottom is often borne by the demoulding rod. The top of the demoulding rod should be designed as a zigzag hook or a sunken groove, so that the sprue can be pulled out smoothly when demoulding. shunt It is the channel connecting the main channel and each cavity in the multi-slot mold. In order to make the melt fill each cavity at the same speed, the arrangement of the runners on the mold should be symmetrical and equidistant. The shape and size of the runner section have an impact on the flow of the plastic melt, the demolding of the product and the ease of mold manufacturing. If the flow of the same amount of material is considered, the flow channel resistance with a circular cross-section is the smallest. However, because the specific surface of the cylindrical runner is small, it is not good for the cooling of the runner excess, and the runner must be opened on the two halves of the mold, which is labor-intensive and difficult to align. Therefore, trapezoidal or semi-circular cross-section runners are often used, and are opened on half of the mold with ejector bars. The runner surface must be polished to reduce flow resistance and provide faster filling speed. The size of the runner depends on the type of plastic, the size and thickness of the product. For most thermoplastics, the cross-sectional width of the runner is not more than 8m, the extra large can reach 10-12m, and the extra small is 2-3m. Under the premise of meeting the needs, the cross-sectional area should be reduced as much as possible to increase the shunting duct debris and prolong the cooling time. gate It is the channel that connects the main channel (or shunt channel) and the cavity. The cross-sectional area of Breath collector upper cover mold Plant ​​the channel can be equal to the main channel (or branch channel), but it is usually reduced. Therefore, it is the part with the smallest cross-sectional area in the entire runner system. The shape and size of the gate have a great influence on the quality of the product.

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  • 2022.05.05

    Seven matters should be paid attention to in the development and injection of medical device molds

    Seven matters should be paid attention to in the development and injection of medical device molds Compared with ordinary molds, the control in the manufacturing process of medical device accessories molds is different. We need to pay attention to the following matters. 1, We need to know whether the customer's product belongs to class 1, class 2 or class 3 medical devices. In the process of making medical device molds, the automation, cleanliness and production process control are different. For example, if it is class 2 medical consumables, we design the mold In the process, fully automated production will be considered to reduce the participation of personnel, and the ejection and lubrication systems will be different from ordinary molds, reducing the pollution of oil contamination to medical equipment products. 2, We will also recommend suitable medical plastics according to the specific needs of customers' medical products. Engaged in medical injection molding for more than 10 years, we have accumulated rich information on medical plastics at home and abroad, which can help customers choose medical equipment and medical equipment suitable for you. Suitable plastic for consumables. Not only from the use of medical products, but also from Auto air conditioning body mold the medical injection molding process to help customers reduce costs and improve quality. We firmly believe that easy processing and smooth process are the key factors to ensure the quality and low price of medical plastic products. 3. The barrel temperature of ordinary injection molding machines cannot meet the melting requirements of high-temperature plastics. For the injection of high-temperature medical plastic products, the company is also equipped with specific medical injection molding machines to produce high-temperature medical plastic products. 4, The company is equipped with imported medical micro-injection molding machines, which are specialized in the injection molding production of small products ranging from 0.1g to 0.5g to ensure product accuracy. 5, We will choose the appropriate mold structure and injection molding production plan according to your medical plastic production and processing quantity requirements, product structure and quality requirements, and will also help you recommend suitable and cost-effective medical plastics. 6, Before the medical device mold is opened, we will provide a manufacturable information report to ensure that you and us have a consistent understanding of  Auto air conditioner snail shell mold quality, structure and product optimization, while eliminating the risk of mold development and medical plastic production. 7, At the beginning of your inquiry, we will ask you about the requirements of medical packaging methods, to ensure the cost and medical product packaging safety in the early stage

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  • 2022.04.26

    Mold repair knowledge

    Mold repair knowledge According to incomplete statistics, the annual consumption value of molds in the machining industry is five times the total value of various machine tools. It is conceivable that the mold market in machinery, metallurgy, light industry, electronics and other industries is so huge. Another example: in the metallurgical industry, the annual consumption of hot-rolled rolls alone is more than 300,000 tons, and the value of hot-rolled rolls accounts for more than 5% of Auto air conditioner snail shell mold Plant the cost of steel production. The large consumption of molds not only directly increases production costs, but also causes greater economic losses due to frequent shutdown of a large number of production lines due to frequent mold replacement. The failure of the mold is actually scrapped due to the local material wear on the surface layer, and the processing cycle of the mold is very long and the processing cost is extremely high (especially the manufacturing and processing cost of precision and complex molds or large molds is as high as hundreds of thousands of yuan or even millions of dollars. Yuan). Therefore, it is undoubtedly a method with important economic significance to strengthen the surface of the specific parts of the mold that are really subjected to wear, so as to greatly extend and improve the service life of the mold. In addition, most molds fail and are scrapped only because a thin layer of material is worn on Auto Air Conditioner Bracket Mould Plant the surface. Therefore, it is only necessary to repair the worn local areas on the surface of the mold and key metal parts, and in the repair process, the surface of the mold is actually subjected to wear and tear. The surface of the mold is coated with a high-hardness and high-wear-resistant metal layer, which can "turn waste into treasure", not only the mold can be repaired, but the service life of the repaired mold will be greatly improved compared with the original mold, and the economic benefits will be huge (such as : It only takes a few days to repair a large shaft of a power plant motor including various preparation times, but it can create economic benefits of millions of yuan). Mold repairing machine is a high-tech equipment for repairing mold surface wear and processing defects. The principle of the mold repairing machine is to use the principle of high-frequency electric spark discharge to perform heat-free surfacing welding on the workpiece to repair the surface defects and wear of the metal mold. The main feature is that the heat-affected area is small, and the mold will not be deformed, annealed, There is no stress concentration and no cracks, which ensures the integrity of the mold; it can also use its strengthening function to strengthen the surface of the mold workpiece to achieve wear resistance, heat resistance, and corrosion resistance of the mold. The mold repairing machine strengthens the mold with long service life and good economic benefits. It can be used to strengthen and repair the surface of various iron-based alloys (carbon steel, alloy steel, cast iron), nickel-based alloys and other metal materials, molds and workpieces, and greatly improve the service life. Scope of application: machinery, automobile, light industry, household appliances, petroleum, chemical industry, electric power and other industrial equipment manufacturing departments and use departments, key wear parts of aero-engine, hot extrusion dies, warm extrusion film tools, hot forging dies, rolling steel rolling Parts and molds for guides, rollers, camshafts of automobile engines, etc.

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  • 2022.04.18

    How much do you know about the manufacturing process performance of the mold?

    How much do you know about the manufacturing process performance of the mold? The manufacture of molds generally has to go through several processes such as forging, cutting, and heat treatment. In order to ensure the manufacturing quality of the mold and reduce the production cost, the material should have good forgeability, machinability, hardenability, hardenability and grindability; it should also have small oxidation, decarburization sensitivity and quenching. Deformation and cracking tendency. 1. Forgeability It has low hot forging deformation resistance, good plasticity, wide forging temperature range, low tendency for forging cracking and cold cracking and precipitation of network carbides. 2. Annealing manufacturability The spheroidizing annealing temperature range is wide, the annealing hardness is low and the fluctuation range is small, and the spheroidizing rate is high. 3. Machinability The cutting amount is large, the tool loss is low, and the machined surface roughness is low. 4. Oxidation, decarburization sensitivity When heated at high temperature, it has good anti-oxidation energy, slow decarburization Auto parts Mould speed, insensitivity to heating medium, and small tendency to produce pitting. 5. Hardenability It has a uniform and high surface hardness after quenching. 6. Hardenability After quenching, a deep hardened layer can be obtained, which can be hardened by using a mild quenching medium. 7. Quenching deformation cracking tendency The volume change of conventional quenching is small, the shape is warped, the distortion is slight, and the abnormal deformation tendency is low. Conventional quenching has low cracking sensitivity and is not sensitive to quenching temperature and workpiece shape. 8. Grindability The relative loss of  Household appliances Mould the grinding wheel is small, the limit grinding amount without burns is large, it is not sensitive to the quality of the grinding wheel and the cooling conditions, and it is not easy to cause abrasion and grinding cracks.

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  • 2022.04.11

    Mold material selection requirements

    Mold material selection requirements Mold material selection is a very important link in  Auto parts Mould the entire mold making process. The selection of mold materials needs to meet three principles. The mold meets the work requirements such as wear resistance and toughness, the mold meets the process requirements, and the mold should meet economic applicability. Condition requirements 1. Wear resistance When the blank is plastically deformed in the mold cavity, it both flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, resulting in the failure of the mold due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold. Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material. 2. toughness Most of the working conditions of the mold are very bad, and some often bear a large impact load, which leads to brittle fracture. In order to prevent sudden brittle fracture of mold parts during operation, the mold must have high strength and toughness. The toughness of the mold mainly depends on the carbon content, grain size and organizational state of the material. 3. Fatigue fracture performance During the working process of the mold, fatigue fracture is often caused under the long-term action of cyclic stress. Its forms include small-energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of the mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material. 4. High temperature performance When the working temperature of the mold is higher, the hardness and strength will decrease, resulting in Household appliances Mould early wear of the mold or plastic deformation and failure. Therefore, the mold material should have high anti-tempering stability to ensure that the mold has high hardness and strength at working temperature. 5. Thermal fatigue resistance Some molds are in a state of repeated heating and cooling during the working process, which causes the surface of the cavity to be subjected to tension, pressure and stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, resulting in Mold failure. Hot and cold fatigue is one of the main forms of failure of hot work dies, and these dies should have high resistance to cold and heat fatigue. 6. Corrosion resistance When some molds such as plastic molds are working, due to the presence of chlorine, fluorine and other elements in the plastic, strong corrosive gases such as HCI and HF are decomposed after heating, which erodes the surface of the mold cavity, increases its surface roughness, and aggravates wear failure.

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  • 2022.04.06

    Requirements and characteristics of mold design and production

    Requirements and characteristics of mold design and production The requirements of mold design and production are: accurate size, smooth surface; reasonable structure, high production efficiency, easy to automate; easy to manufacture, long life, low cost; design meets process needs, economical and reasonable. Mold structure design and parameter selection must consider factors such as rigidity, orientation, unloading mechanism, positioning method, and gap size. The wearing parts on the mold should be easy to replace. For plastic molds and die-casting molds, it is also necessary to consider a reasonable gating system, the flow state of the molten plastic or metal, and the location and direction of  Auto parts Mould Plant entry into the cavity. In order to improve productivity and reduce runner casting loss, multi-cavity molds can be used, and multiple identical or different products can be completed simultaneously in one mold. High-efficiency, high-precision and long-life molds should be used in mass production. The stamping die should use a multi-position progressive die:and a cemented carbide insert progressive die can be used to improve the service life. In small batch production and trial production of Household appliances Mould Plant new products, simple molds with simple structure, fast manufacturing and low cost should be used, such as combined die, sheet die, polyurethane rubber die, low melting point alloy die, zinc alloy die, superplastic alloy die, etc. The mold has begun to use computer-aided design (CAD), which is to optimize the design of the mold through a complete computer-centric system. This is the development direction of mold design. According to the structural characteristics, the mold manufacturing is divided into a flat blanking die and a cavity die with a space. The punching die uses the size of the punch and the die to fit precisely, and some even have no clearance fit. Other forging dies such as cold extrusion dies, die casting dies, powder metallurgy dies, plastic dies, rubber dies, etc. belong to cavity dies, which are used to form three-dimensional workpieces. Cavity molds have size requirements in the three directions of length, width and height, and the shape is complex and difficult to manufacture. Mold production is generally single-piece and small-batch production. The manufacturing requirements are strict and precise, and most sophisticated processing equipment and measuring devices are used. The plane blanking die can be initially formed by EDM, and then the accuracy can be further improved by forming grinding, coordinate grinding and other methods. Shape grinding can be done with an optical projection curve grinder, or a surface grinder with a miniature and grinding wheel mechanism, or with a special shape grinding tool on a precision surface grinder. Coordinate grinder can be used for precise positioning of molds to ensure precise hole diameter and hole spacing. It can also use a computer numerical control (CNC) continuous trajectory coordinate grinder to grind punches and dies of any curved shape. Cavity molds are mostly processed by profiling milling machines, electrical discharge machining and electrolytic machining. The combined application of copy milling and numerical control and the addition of a three-way translation head device in EDM can improve the machining quality of the cavity. The addition of gas-filled electrolysis in electrolytic processing can improve production efficiency.

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  • 2022.04.01

    Do you know the template design of the mold?

    Do you know the template design of the mold? The main templates of continuous molds include punch fixing plate, pressing plate, concave plate, etc. The structural design depends on the accuracy of stamping products, production quantity, processing equipment and processing methods of the mold, and maintenance methods of the mold, etc. There are the following three types Forms: (1) Monolithic, (2) Yoke, (3) Inserted. 1. Monolithic Monolithic formwork is also known as one-piece construction type, and its processing shape must be closed. The monolithic template is mainly used for the mold with simple structure or low precision. Its processing method is mainly cutting (without heat treatment). The template with heat treatment must be subjected to wire cutting or electrical discharge machining and grinding. When the size of the template is long (continuous mold), two or more pieces of one-piece type will be used together. 2. yoke The central part of the yoke formwork is grooved to assemble block products. Its structure is based on application requirements, and the groove portion can be formed by other templates. The advantages of this yoke formwork structure are: the groove part is easy to process, the groove part width can be adjusted, and the processing accuracy is good. But low rigidity is its disadvantage. The design considerations for the yoke formwork are as follows: (1) The fitting of the yoke plate structure and the block parts adopts the middle or light fitting method. If the strong press fit is adopted, the yoke plate will change. (2) The yoke plate also has the function of retaining the block parts, and must have sufficient rigidity to withstand the side pressure and surface pressure of the block parts. In addition, in order to make the grooves of the yoke plate and the block parts closely combined, the corners of the grooves are processed for clearance. If the corners of the grooves of the yoke plate cannot be processed for clearance, the block parts must be processed for clearance. (3) The division of block parts should also consider the internal shape, and the reference plane must be clarified. In order to prevent deformation during stamping, attention should also be paid to the shape of each block-shaped part. (4) When many pieces of block parts are assembled into the yoke plate, the pitch changes due to the accumulated error of the processing of each block part. The solution is to design the middle block parts in an adjustable way. (5) The block parts adopt the mold structure of side-by-side combination, because the block parts will be subjected to lateral pressure during punching processing, which will cause gaps between the block parts or cause the block parts to tilt. This phenomenon is an important cause of poor punching such as poor punching dimensions and clogging of punching chips, so adequate countermeasures are required. (6) The fixing methods of the block parts in the yoke plate are as follows according to their size and shape: A. Fix with locking screws, B. Fix with keys, C. Fix with swivel keys, D. With shoulders Fix, E. The above pressing parts (such as guide plates) are pressed and fixed. 3. Built-in The circular or square concave parts are processed in the template, and the block parts are embedded in the template. This template is called an embedded structure. This structure has less cumulative machining tolerance, high rigidity, and accurate reproducibility during disassembly and assembly. good. Due to the advantages of easy machining, the machining accuracy is determined by the working machine, and the final adjustment process is less, the insert-type template structure has become the mainstream of precision stamping dies, but its disadvantage is that a high-precision hole processing machine is required. When the continuous stamping die adopts this template structure, in order to make the template have high rigidity requirements, an empty station is designed. Precautions for the construction of a built-in template are as follows: (1) Processing of embedded holes: vertical milling machines (or jig milling machines), comprehensive processing machines, jig boring machines, jig grinders, wire-cut electrical discharge machines, etc. are used for the processing of embedded holes in the template. The machining standard for embedding holes, when using a wire-cut electric discharge machine, in order to improve its machining accuracy, two or more wire-cutting processes are performed. (2) Fixing method of inserts: The determinants of the fixing method of inserts include the accuracy of processing, the ease of assembly and disassembly, and the possibility of adjustment. There are four ways to fix the insert: A. Fix it with screws, B. Fix it with the shoulder, C. Fix it with the toe block, D. The upper part is pressed with a plate. The insert fixing method of the concave formwork also adopts press fit. At this time, the relaxation result caused by the thermal expansion of processing should be avoided. When using the circular die insert to process irregular holes, a rotation prevention method should be designed. (3) Considerations for the assembly and disassembly of the inserts: The machining accuracy of the inserts and their holes is required to be high for assembly operations. In order to obtain even a slight dimensional error that can be adjusted at the time of assembly, it is advisable to consider solutions in advance. The specific considerations for the processing of inserts are as follows: A. There is a press-in introduction part, B. The spacer is used to adjust the insert The pressed state and correct position of the parts, C. There are holes for pressing out on the bottom surface of the inserts. D. Screws of the same size should be used when locking with screws to facilitate locking and loosening. E. In order to prevent the assembly direction from changing If mistakes are made, fool-proof chamfering should be designed.

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  • 2022.03.22

    Design principle of mold

    Design principle of mold Because different forming molds have been applied in many fields, and the manufacturing technology of professional molds has also changed and developed in recent years, in this part, the general design rules of vacuum forming molds are summarized. The design of vacuum forming mold includes batch size, molding equipment, precision conditions, geometric shape design, dimensional stability and surface quality. 1. The batch size is used for experiments, the mold output is small, and wood or resin can be used for manufacturing. However, if the experimental mold is to obtain data about shrinkage, dimensional stability and cycle time of the product, a single cavity mold should be used for the experiment, and it can be guaranteed to be used under production conditions. Molds are generally made of plaster, copper, aluminum or aluminum-steel alloys, and aluminum-resin is rarely used. 2. Geometric shape design. When designing, dimensional stability and surface quality are often considered comprehensively. For example, product design and dimensional stability require the use of female molds (concave molds), but products that require high gloss on the surface require the use of male molds (punch molds). point so that the product can be produced under optimal conditions. Experience has shown that designs that do not meet actual machining conditions often fail. 3. Dimensional stability. During the molding process, the surface of the plastic part in contact with the mold has better dimensional stability than the part that leaves the mold. If the material thickness needs to be changed in the future due to the material stiffness, it may lead to the conversion of the male mold to the female mold. The dimensional tolerance of plastic parts cannot be less than 10% of the shrinkage.4. As far as the surface of the plastic part can be covered by the molding material, the surface structure of the visible surface of the plastic part should be formed at the contact point with the mold. If possible, the smooth surface of the plastic part should not come into contact with the mold surface. As is the case with the use of female molds for bathtubs and laundry tubs. 5. For decoration, if a mechanical horizontal saw is used to saw off the clamping edge of the plastic part, there should be at least a 6-8mm margin in the height direction. Other finishing work, such as grinding, laser cutting or jetting, must also be left over. The gap between the cutting lines of the knife edge die is the smallest, and the distribution width of the punching die during trimming is also small, which should be paid attention to. 6. Shrinkage and deformation, plastic is easy to shrink (such as PE), and some plastic parts are easy to deform. No matter how to prevent it, plastic parts will deform during the cooling stage. Under this condition, it is necessary to change the shape of the forming mold to adapt to the geometric deviation of the plastic part. For example: although the wall of the plastic part remains straight, its reference center has been deviated by 10mm; the mold base can be raised to adjust the amount of shrinkage of this deformation. 7. Shrinkage: The following shrinkage factors must be taken into account when manufacturing blister forming molds. ① Shrinkage of molded products. If the shrinkage rate of the plastic cannot be clearly known, it must be obtained by sampling or testing with a similarly shaped mold. Note: Only the shrinkage rate can be obtained by this method, and the deformation size cannot be obtained. ② Shrinkage caused by the adverse effects of intermediate media, such as ceramics, silicone rubber, etc. ③ Shrinkage of the material used in the mold, such as shrinkage when casting aluminum.

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  • 2022.03.14

    Seven matters should be paid attention to in the development and injection of medical device molds

    Seven matters should be paid attention to in the development and injection of medical device moldsCompared with ordinary molds, the control in the manufacturing process of medical device accessories molds is different. We need to pay attention to the following matters. 1, We need to know whether the customer's product belongs to class 1, class 2 or class 3 medical devices. In the process of making medical device molds, the automation, cleanliness and production process control are different. For example, if it is class 2 medical consumables, we design the mold In the process, fully automated production will be considered to reduce the participation of personnel, and the ejection and lubrication systems will be different from ordinary molds, reducing the pollution of oil contamination to medical equipment products. 2, We will also recommend suitable medical plastics according to the specific needs of customers' medical products. Engaged in medical injection molding for more than 10 years, we have accumulated rich information on medical plastics at home and abroad, which can help customers choose medical equipment and medical equipment suitable for you. Suitable plastic for consumables. Not only from the use of medical products, but also from the medical injection molding process to help customers reduce costs and improve quality. We firmly believe that easy processing and smooth process are the key factors to ensure the quality and low price of medical plastic products. 3. The barrel temperature of ordinary injection molding machines cannot meet the melting requirements of high-temperature plastics. For the injection of high-temperature medical plastic products, the company is also equipped with specific medical injection molding machines to produce high-temperature medical plastic products. 4, The company is equipped with imported medical micro-injection molding machines, which are specialized in the injection molding production of small products ranging from 0.1g to 0.5g to ensure product accuracy. 5, We will choose the appropriate mold structure and injection molding production plan according to your medical plastic production and processing quantity requirements, product structure and quality requirements, and will also help you recommend suitable and cost-effective medical plastics. 6, Before the medical device mold is opened, we will provide a manufacturable information report to ensure that you and us have a consistent understanding of quality, structure and product optimization, while eliminating the risk of mold development and medical plastic production. 7, At the beginning of your inquiry, we will ask you about the requirements of medical packaging methods, to ensure the cost and medical product packaging safety in the early stage

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  • 2022.03.07

    The principle of mold design

    The principle of mold design Because different forming molds have been applied in many fields, and the manufacturing technology of professional molds has also changed and developed in recent years, in this part, the general design rules of vacuum forming molds are summarized. The design of vacuum forming mold includes batch size, molding equipment, precision conditions, geometric shape design, dimensional stability and surface quality. 1. The batch size is used for experiments, the mold output is small, and wood or resin can be used for manufacturing. However, if the experimental mold is to obtain data about shrinkage, dimensional stability and cycle time of the product, a single cavity mold should be used for the experiment, and it can be guaranteed to be used under production conditions. Molds are generally made of plaster, copper, aluminum or aluminum-steel alloys, and aluminum-resin is rarely used. 2. Geometric shape design. When designing, dimensional stability and surface quality are often considered comprehensively. For example, product design and dimensional stability require the use of female molds (concave molds), but products that require high gloss on the surface require the use of male molds (punch molds). point so that the product can be produced under optimal conditions. Experience has shown that designs that do not meet actual machining conditions often fail. 3. Dimensional stability. During the molding process, the surface of the plastic part in contact with the mold has better dimensional stability than the part that leaves the mold. If the material thickness needs to be changed in the future due to the material stiffness, it may lead to the conversion of the male mold to the female mold. The dimensional tolerance of plastic parts cannot be less than 10% of the shrinkage. 4. As far as the surface of the plastic part can be covered by the molding material, the surface structure of the visible surface of the plastic part should be formed at the contact point with the mold. If possible, the smooth surface of the plastic part should not come into contact with the mold surface. As is the case with the use of female molds for bathtubs and laundry tubs. 5. For decoration, if a mechanical horizontal saw is used to saw off the clamping edge of the plastic part, there should be at least a 6-8mm margin in the height direction. Other finishing work, such as grinding, laser cutting or jetting, must also be left over. The gap between the cutting lines of the knife edge die is the smallest, and the distribution width of the punching die during trimming is also small, which should be paid attention to. 6. Shrinkage and deformation, plastic is easy to shrink (such as PE), and some plastic parts are easy to deform. No matter how to prevent it, plastic parts will deform during the cooling stage. Under this condition, it is necessary to change the shape of the forming mold to adapt to the geometric deviation of the plastic part. For example: although the wall of the plastic part remains straight, its reference center has been deviated by 10mm; the mold base can be raised to adjust the amount of shrinkage of this deformation. 7. Shrinkage: The following shrinkage factors must be taken into account when manufacturing blister forming molds. ① Shrinkage of molded products. If the shrinkage rate of the plastic cannot be clearly known, it must be obtained by sampling or testing with a similarly shaped mold. Note: Only the shrinkage rate can be obtained by this method, and the deformation size cannot be obtained. ② Shrinkage caused by the adverse effects of intermediate media, such as ceramics, silicone rubber, etc. ③ Shrinkage of the material used in the mold, such as shrinkage when casting aluminum.

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