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  • 2022.03.02

    How is the mold made?

    How is the mold made? Production Process A mold is a model, and products are made according to this model, but how the mold is produced may not be answered by most professionals except for the mold. The mold has played an irreplaceable role in our life. Our daily necessities Most of them are inseparable from molds, such as computers, telephones, fax machines, keyboards, cups, etc. These plastic products need not be mentioned. In addition, the covers of automobiles and motorcycle engines are also made of molds. More than 20,000 molds are used for various molds. Therefore, the role of molds in modern life is irreplaceable. As long as mass production is inseparable from molds. So how is the mold made? The following is a brief introduction to the modern mold production process. 1) ESI: This stage is mainly a technical discussion between customers and suppliers on product design and mold development. The main purpose is to allow suppliers to clearly understand the design intent and accuracy requirements of product designers. At the same time, it also allows product designers to better understand the ability of mold production and the process performance of products, so as to make more reasonable designs. 2) Quotation: including the price of the mold, the life of the mold, the turnover process, the required tonnage of the machine and the delivery time of the mold. (A more detailed quotation should include product size weight, mold size weight and other information.) 3) Order (Purchase Order): customer orders, the issuance of deposits and the acceptance of supplier orders. 4) Mold Production Planning and Schedule Arrangement: At this stage, it is necessary to reply to the customer for the specific date of mold delivery. 5) Mold Design: Design software that may be used include Pro/Engineer, UG, Solidworks, AutoCAD, CATIA, etc. 6) Procurement of materials 7) Mould processing (Machining): The processes involved generally include turning, gong (milling), heat treatment, grinding, computer gong (CNC), electric spark (EDM), wire cutting (WEDM), coordinate grinding (JIG GRINGING), Laser engraving, polishing, etc. 8) Mold assembly (Assembly) 9) Trial Run 10) Sample Evaluation Report (SER) 11) Model evaluation report approval (SER Approval)

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  • 2022.02.21

    Inspection during mold making

    Inspection during mold making The control of the raw materials of the mold is carried out from the following aspects: 1. Macro inspection The chemical composition is decisive to ensure the performance of the steel, but the composition is qualified and cannot fully explain the performance of the steel. Due to the inhomogeneity of the internal structure and composition of the steel, the macro inspection supplements this deficiency to a large extent. Macroscopic inspection can observe the crystallization of the steel, the failure of the continuity of the steel and the inhomogeneity of some components. There are 8 common macro defects: segregation, porosity, inclusions, shrinkage cavities, bubbles, white spots, cracks, and folds. 2. Evaluation of annealing structure The purpose of annealing is to reduce the hardness of the steel, facilitate machining, and also prepare the structure for subsequent heat treatment. The annealed structure of carbon tool steel is evaluated according to the first-level rating chart of GB1298. 3. Carbide inhomogeneity Cr12 type ledeburite steel contains a large amount of eutectic carbides in the structure, and the inhomogeneity of carbides has a very important influence on the performance, so the distribution of its carbides must be strictly controlled. All in all, due to the cumbersome production objects of mold factories and workshops, and more or less single pieces and small batches, it brings certain difficulties to the formulation and management of mold production quotas. In addition, the production methods of each factory and workshop, The equipment and technical quality are not the same, so when setting the quota, it is necessary to find an appropriate method to formulate an advanced and reasonable working hour quota according to the actual situation of the factory and workshop, in order to improve labor productivity.

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  • 2022.02.16

    What are the key points of mold design

    What are the key points of mold design Work steps 1. Review items before design 1. Mold material 2. Molded product 3. Molding machine selection 4. Basic structure of die base 2. Important items of mold design (1). Multi-color injection combination 2. runner system (1) The injection pressure is low. (2) Fast filling is completed, which can increase the output. (3) It can be uniformly injected, and the product quality is better. (4) Reduce waste and shorten injection time. 3. Forming equipment: (1) The injection volume of each injection cylinder determines which material cylinder is used for which color. (2) The position and stroke of the striker. (3) The configuration of the water circuit, oil circuit, and circuit on the rotating disk. (4) The bearing weight of the rotating disc. 4. Mold base design: mold core configuration design First of all, considering that the male mold side of the mold must be rotated 180 degrees, the mold core settings must be arranged in a cross-symmetrical arrangement, otherwise the mold cannot be closed and formed. (1) Guide post: It has the function of guiding the male mold and the female mold. Concentricity must be maintained in the multi-color mold. (2) Return pin: Since the mold must rotate, the ejector plate must be fixed, and a spring is added to the return pin to keep the ejector plate stable. (3) Positioning block: ensure that the two mold bases are not offset due to the gap of the screws when they are fixed on the large solid plate. (4) Adjustment block (wear-resistant block): It is mainly used to adjust the z coordinate value of the mold height when the mold is closed. (5) Ejection mechanism: The design of the ejection method is the same as that of the general mold. (6) Design of cooling circuit: The cooling circuit design of mold one and mold two should be the same as possible.

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  • 2022.02.12

    Other classifications of molds

    Other classifications of molds (1) Hot runner mold With the help of the heating device, the plastic in the gating system will not solidify, nor will it be demolded with the product, so it is also called a runnerless mold. Advantages: 1) No waste 2) Can reduce injection pressure, can use multi-cavity mold 3) Can shorten molding cycle 4) Improve product quality Features suitable for hot runner molding compounds: 5) The melting temperature range of plastics is wide. At low temperature, it has good fluidity, and at high temperature, it has better thermal stability. 6) Sensitive to pressure, does not flow without pressure, but can flow when pressure is applied. 7) Good specific heat, so that it can be cooled quickly in the mold. Available hot runner plastics are PE, ABS, POM, PC, HIPS, PS. There are two commonly used hot runners: 1) heating runner molds 2) adiabatic runner molds. (2) Hard mold The steel plate used in the inner mold needs to be heat treated after buying it, such as quenching and carburizing, to meet the requirements of use. Such an injection mold is called a hard mold. For example, the inner mold is made of H13 steel, 420 steel, and S7 steel. (3) Soft mold (below 44HRC) The steel used in the inner mold can meet the requirements of use without heat treatment after purchase. Such injection molding is called soft mold. For example, the inner module adopts P20 steel, ace steel, 420 steel, NAK80, aluminum, beryllium copper. Suzhou Huihong Electric Co., Ltd. is a professional manufacturer of precision molds , injection molding, 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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  • 2022.02.09

    Two,Die casting classification

    (4) Injection molding Also known as die casting. It is to add plastic raw materials into the preheated feeding chamber, then put the pressure column into the charging chamber to lock the mold, and apply pressure to the plastic through the pressure column. The plastic melts into a flowing state under high temperature and high pressure, and enters the cavity through the pouring system. It gradually solidifies into a plastic part. This molding method is also called transfer molding. Injection molding is suitable for plastics that are lower than solid plastics and can be compression molded in principle, and can also be molded by injection molding. However, it is required that the molding material has good fluidity in the molten state when it is lower than the curing temperature, and has a larger curing rate when it is higher than the curing temperature. (5) Blow molding It is to fix the tubular or sheet-like blanks in the plasticized state made by extrusion or injection into the molding die, and immediately introduce compressed air to force the blanks to expand and stick to the wall of the mold cavity. A processing method for obtaining the desired hollow product by demoulding after cooling and shaping. Plastics suitable for hollow molding are high pressure polyethylene, low pressure polyethylene, hard polyvinyl chloride, soft polyvinyl chloride, polystyrene, polypropylene, polycarbonate, etc. According to different parison molding methods, hollow molding is mainly divided into extrusion blow molding and injection blow molding. The advantage of extrusion blow molding is that the structure of the extruder and the extrusion blow mold is simple, and the disadvantage is that the wall thickness of the parison is inconsistent, which is easy to cause uneven wall thickness of plastic products. The advantage of injection blow molding hollow molding is that the wall thickness of the parison is uniform and there is no flash. Since the injection parison has a bottom surface, the bottom of the hollow product will not have joints and seams, which is not only beautiful but also high in strength. The disadvantage is that the molding equipment and molds used are expensive, so this molding method is mostly used in the mass production of small hollow products, and it is not widely used in extrusion blow molding. (6) Die-casting mold Die casting molds are also called transfer molding molds. The plastic raw material is added to the preheated feeding chamber, and then pressure is applied to the pressure column. The plastic is melted under high temperature and high pressure, and enters the cavity through the casting system of the mold, and gradually hardens and forms. This molding method is called die casting. The mold used It is called die casting mould. This kind of mold is mostly used for the molding of thermosetting plastics.

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  • 2022.01.26

    Mold casting classification

    Mold casting classification(1) Injection moldingThe plastic is first added to the heating barrel of the injection machine, and the plastic is heated and melted. Under the push of the screw or plunger of the injection machine, it enters the mold cavity through the nozzle and the mold pouring system, and is hardened and shaped into injection molding due to physical and chemical effects. product. Injection molding consists of a cycle consisting of injection, pressure holding (cooling) and plastic part demolding processes, so injection molding has the characteristics of periodicity. Thermoplastic injection molding has a short molding cycle, high production efficiency, and low wear on the mold by the melt. It can mold plastic parts with complex shapes, clear surface patterns and markings, and high dimensional accuracy in large quantities; however, for plastics with large wall thickness changes. It is difficult to avoid molding defects. Anisotropy of plastic parts is also one of the quality problems, and all possible measures should be taken to minimize it.(2) Compression moldingCommonly known as compression molding, it is one of the earliest methods of molding plastic parts. Compression molding is to directly add plastic into an open mold cavity with a certain temperature, then close the mold, and melt the plastic into a flowing state under the action of heat and pressure. Due to physical and chemical effects, the plastic is hardened into a plastic part with a certain shape and size that remains unchanged at room temperature. Compression molding is mainly used for molding thermosetting plastics, such as phenolic molding powder, urea-formaldehyde and melamine-formaldehyde molding powder, glass fiber reinforced phenolic plastic, epoxy resin, DAP resin, silicone resin, polyimide and other molding compounds, It can also be processed into unsaturated polyester dough (DMC), sheet molding compound (SMC), prefabricated integral molding compound (BMC), etc. Under normal circumstances, compression dies are often divided into three types: overflow type, non-overflow type, and semi-overflow type according to the matching structure of the upper and lower molds of the compression film.(3) Extrusion moldingIt is a molding method in which the plastic in a viscous flow state passes through a die with a specific cross-sectional shape at a high temperature and a certain pressure, and then is shaped into a continuous profile with the desired cross-sectional shape at a lower temperature. The production process of extrusion molding is preparation of molding materials, extrusion molding, cooling and shaping, traction and cutting, and post-processing (quenching and tempering or heat treatment) of extruded products. In the extrusion molding process, pay attention to adjusting the temperature, screw revolutions, traction speed and other process parameters of each heating section of the extruder barrel and the die in order to obtain qualified extrusion profiles. Special attention should be paid to adjusting the rate at which the polymer melt is extruded from the die. Because when the extrusion rate of the molten material is low, the extrudate has a smooth surface and a uniform cross-sectional shape; but when the extrusion rate of the molten material reaches a certain limit, the surface of the extrudate will become rough and tarnished , appear shark skin, orange peel, shape distortion and other phenomena. When the extrusion rate was further increased, the extrudate surface was distorted and even fragmented and fractured into melt fragments or cylinders. Therefore, the control of extrusion rate is very important.

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  • 2022.01.25

    Mould material and gating system

    Mould material and gating systemThe most important factors of mold material are thermal strength and thermal stability, commonly used mold materials: working temperature, forming material, mold material<300℃ zinc alloy Cr12, Cr12MoV, S-136, SLD, NAK80, GCr15, T8, T10.300~500℃ aluminum alloy, copper alloy 5CrMnMo, 3Cr2W8, 9CrSi, W18Cr4V, 5CrNiMo, W6Mo5Cr4V2, M2.500~800℃ Aluminum alloy, copper alloy, steel titanium GH130, GH33, GH37.800~1000℃ Titanium alloy, steel, stainless steel, nickel alloy K3, K5, K17, K19, GH99, IN100, ЖC-6NX88, MAR-M200, TRW-NASA, WA.>1000℃ Nickel alloy Copper base alloy mold, cemented carbide mold.Gating system classificationAccording to the different types of gating systems, plastic molds can be divided into three categories:(1) Large nozzle mold: The runner and gate are on the parting line, and the mold is released together with the product when the mold is opened. The design is the simplest, easy to process, and the cost is low, so many people use the large nozzle system for operation. The plastic mold structure is divided into two parts: the movable mold and the fixed mold. The movable part of the injection machine is the movable mold (mostly the ejection side), and the inactive part at the injection end of the injection machine is generally called the fixed mold. Because the fixed part of the large nozzle mold is generally composed of two steel plates, it is also called a two-plate mold for this type of structural mold. The two-plate mold is the simplest structure in the large nozzle mold.(2) Small nozzle mold: The runner and gate are not on the parting line, and are generally directly on the product. Therefore, it is necessary to design more than one set of nozzle parting lines. The design is more complicated and the processing is more difficult. Generally, it should be selected according to the product requirements. Fine water system. The fixed part of the nozzle mold is generally composed of three steel plates, so this kind of structural mold is also called "three-plate mold". The three-plate mold is the simplest structure in the nozzle mold.(3) Hot runner mold: The structure of this type of mold is basically the same as that of the fine nozzle. The biggest difference is that the runner is located in one or more hot runner plates and hot nozzles with constant temperature, and there is no cold material demoulding, runner and pouring. The mouth is directly on the product, so the runner does not need to be demolded. This system is also called a nozzleless system, which can save raw materials. It is suitable for the situation where the raw materials are expensive and the product requirements are high, the design and processing are difficult, and the mold cost is high. Hot runner system, also known as hot runner system, is mainly composed of hot sprue sleeve, hot runner plate and temperature control electric box. Our common hot runner system has two types of single-point hot gate and multi-point hot gate. Single-point hot gate is to use a single hot gate sleeve to directly inject molten plastic into the cavity, it is suitable for plastic with a single cavity and a single gate.

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  • 2022.01.17

    Mold types and classification

    Mold types and classificationType of moldMany types of moldsAccording to the processing object and processing technology, it can be divided into:① Die for processing metal.② Process non-metallic and powder metallurgy molds. Including plastic molds (such as two-color molds, compression molds and extrusion molds, etc.), rubber molds and powder metallurgy molds. According to the structural characteristics, the die can be divided into a flat blanking die and a cavity die with space. Moulds are generally single-piece and produced in small batches.Mold classificationDepending on the material being formedMetal molds, plastic molds, and their special molds.Hardware dies are divided into: including stamping dies (such as punching dies, bending dies, deep drawing dies, turning dies, shrinkage dies, undulating dies, bulging dies, shaping dies, etc.), forging dies (such as die forging dies, upsetting dies, etc.) forging dies, etc.), extrusion dies, extrusion dies, die-casting dies, forging dies, etc.;Non-metallic molds are divided into: plastic molds, inorganic non-metallic molds, sand molds, vacuum molds and paraffin molds.Among them, with the rapid development of polymer plastics, plastic molds are closely related to people's lives. Plastic molds can generally be divided into: injection molding molds, extrusion molding molds, gas-assisted molding molds, etc.Suzhou Huihong Electric Co., Ltd. is a professional manufacturer of precision molds , injection molding, 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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  • 2022.01.13

    What is a mold?

    What is a mold?Molds, various molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging, smelting, stamping and other methods. In a nutshell, a mold is a tool used to make a shaped item, this tool is made up of various parts, and different molds are made up of different parts. It mainly realizes the processing of the shape of the article by changing the physical state of the formed material. Known as the "Mother of Industry".Under the action of external force, the blank becomes a tool with a specific shape and size. It is widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, and compression molding or injection molding of engineering plastics, rubber, ceramics and other products. The mold has a specific contour or cavity shape, and the application of the contour shape with the cutting edge can separate the blank according to the contour shape (blanking). Applying the cavity shape allows the blank to obtain a corresponding three-dimensional shape. The mold generally includes two parts, a movable mold and a fixed mold (or a punch and a concave mold), which can be divided and combined. When separated, the parts are taken out, and when closed, the blanks are injected into the mold cavity to form. The mold is a precision tool with complex shape, which bears the expansion force of the blank, and has high requirements on structural strength, rigidity, surface hardness, surface roughness and machining accuracy. The development level of mold production is one of the important symbols of the level of machinery manufacturing.Many types of moldsAccording to the processing object and processing technology, it can be divided into:① Die for processing metal.② Process non-metallic and powder metallurgy molds. Including plastic molds (such as two-color molds, compression molds and extrusion molds, etc.), rubber molds and powder metallurgy molds. According to the structural characteristics, the die can be divided into a flat blanking die and a cavity die with space. The mold is generally a single piece, small batch production

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