Die test problem of automobile stamping die

1. Pay attention to the selection of mold steel
This is the most important step to improve the quality of mold steel. Many factors need to be considered, including: the selection of mold steel materials, the usability and safety of mold steel structures, the machinability of mold steel parts, and the convenience of mold steel maintenance. These should be considered as thoroughly as possible at the beginning of the design.
①The selection of mold steel materials should not only meet the customer's requirements for product quality, but also consider the cost of the material and its strength within the set period. , the main failure mode and other factors to select materials.
② When designing the mold steel structure, try to make the structure as compact and easy to operate as possible, and ensure that the mold steel parts have sufficient strength and rigidity; when the mold steel structure allows, the corners of each surface of the mold steel parts should be designed as rounded transitions as much as possible. In order to avoid stress concentration; for the concave mold, cavity and part of the punch and core, the combination or mosaic structure can be used to eliminate the stress concentration; for the slender punch or core, appropriate protection measures should be taken in structure; Cold punching dies should be equipped with devices to prevent clogging of parts or waste (such as ejector pins, compressed air, etc.). At the same time, it is also necessary to consider how to reduce sliding fittings and frequent impact parts, which will cause wear and tear in long-term use. Influence on the quality of die steel.
③In the design, it is necessary to reduce the scope of disassembly and assembly when a certain component is repaired, especially when the wearing parts are replaced, the scope of disassembly and assembly should be reduced as much as possible.

2. Pay attention to the machining accuracy of the manufacturing process
This is also an important part of ensuring the quality of mold steel. The processing method and machining accuracy in the manufacturing process of mold steel will also affect the service life of mold steel.
The accuracy of each component directly affects the overall assembly of the mold steel. In addition to the influence of the accuracy of the equipment itself, it is necessary to improve the processing method of the parts and improve the technical level of the fitter in the grinding and matching process of the mold steel to improve the mold steel parts. If the overall assembly effect of the mold steel does not meet the requirements, the probability of the mold steel moving in an abnormal state during the mold test will increase, which will have a great impact on the overall quality of the mold steel.
In order to ensure that the mold steel has good original precision - the original mold steel quality, in the manufacturing process, first of all, it is necessary to reasonably select high-precision processing methods, such as EDM, wire cutting, CNC machining, etc. At the same time, attention should be paid to the quality of the mold steel. Accuracy inspection, including machining accuracy and assembly accuracy of mold steel parts, and comprehensive inspection of mold steel accuracy through mold trial acceptance. During inspection, it is necessary to use high-precision measuring instruments as much as possible. For those mold steel parts with complex surface and curved surface structures, if ordinary rulers and vernier cards cannot achieve accurate measurement data, then three-coordinate measurement is required. Instruments and other precision measuring equipment to ensure the accuracy of the measurement data.

3. Surface strengthening forming parts
This can improve the wear resistance of the surface of the mold steel parts, thereby better improving the quality of the mold steel.
For surface strengthening, different strengthening methods should be selected according to the mold steel used for different purposes. In addition, a technology called FCVA vacuum diamond coating developed in recent years can form a layer on the surface of the part that is extremely strong and combined with the matrix. A very smooth, uniform and dense protective film, this technology is especially suitable for the protective treatment of the surface of the mold steel, and it is also an effective method to improve the quality of the mold steel.

4. Correct use and maintenance of molds
The installation and debugging method of the mold should be appropriate, and the parameters of the CNC bending machine should be consistent with the design requirements and so on.
When using the mold correctly, it is also necessary to carry out regular maintenance on the mold. The guide posts, guide sleeves and other parts with relative motion of the mold should be frequently filled with lubricating oil; for forging molds, plastic molds, die-casting molds and other molds, in Before each mold is formed, lubricant or mold release agent should be sprayed on the surface of the formed parts;
Planned preventive maintenance of the mold and data processing in the maintenance process can prevent possible problems in the production of the mold and improve the efficiency of maintenance work.