Analysis of defects in stamping process

I have been discussing stamping related technologies, but I have never talked about the defects of stamping. Everything has both positive and negative aspects. If there is a positive side, there will be a negative side. For the manufacturing industry, advantages and disadvantages exist at the same time. No matter what kind of processing and manufacturing methods, there are no exceptions. Some processing methods have high precision but relatively high investment and processing costs. Some processing methods are rough, but they can meet the requirements of industry precision and program. Therefore, there is no difference between high and low processing methods, and it is fundamental to adapt to the needs of the industry. Even the transformation and upgrading advocated at present should be decided according to different industries and actual conditions. As for the upgrading of enterprises, it is better for the market to decide. Without further ado, let’s talk about the defects of the stamping process:

  1. The mold problem
    The dies used in stamping process are generally special (some symmetrical products have common-mode blanking), and most stamping products are comprehensively completed by several different stamping processes. There are also some simple products that can be realized in one or two processes; At the same time, mold manufacturing has high precision, long cycle, large investment, many unpredictable problems, and high requirements for mold technicians’ experience, which is a technology-intensive product. Therefore, only when the product is produced in large quantities will the stamping process be considered. The advantages of stamping can be fully reflected, thus obtaining better economic benefits.
  2. Security issuesThere are also some safety-related problems in stamping process. Which stamping factory doesn’t have a big or small work injury every year? If which stamping factory doesn’t have a work injury every year, it is estimated that it will burn high incense in the New Year. This is also one of the characteristics of the industry, which is determined by the production equipment and processing methods. There are only two ways to solve this problem:

    One is transformation and upgrading, and automation transformation (large investment in the early stage) can be done in various ways: small wires can be wired by robots and mechanical arms, and fixed steel beams can be used to reduce investment if the product fluctuates little; Automation, informatization and intelligentization of stamping production are one of the important paths for stamping enterprises to seek long-term development. Some advanced stamping enterprises have begun to apply online automatic detection of stamping parts, automatic framing of the tail of large stamping parts, automatic logistics of AGV in stamping workshop and automatic three-dimensional warehouse of molds. The purpose is to solve the problem of difficult employment, safe operation, improve quality, improve the utilization rate of factory space, and finally improve the comprehensive benefit and market competitiveness. Refer to previous articles for related automation transformation.

    Second, workers should be insured (absolutely). Now there are many types of insurance. If there is no social security, there must be commercial insurance. If there is a work-related injury, the burden on enterprises can be reduced and workers can be compensated.
    Then there are two hazards, noise and vibration, which are produced during stamping. The stamping operators should be equipped with relevant labor protection articles, such as earplugs, wrist guards, gloves, anti-smashing labor protection shoes and so on.

  3. Material problem

    Developing and studying the cold forming of high strength steel is a direction of international efforts at present. At present, the research on hot forming technology and equipment technology at home and abroad is relatively mature, but the research on cold forming is almost blank. Nowadays, high-strength steel and ultra-high-strength steel have realized the lightweight of car body and improved the collision strength and safety performance of vehicles, so they have become an important development direction of automotive steel. However, with the improvement of sheet strength, the traditional cold stamping process is prone to cracking in the forming process, which can not meet the processing requirements of high-strength steel plates. Under the condition that it can’t meet the requirements of normal temperature forming, only the hot stamping technology of ultra-high strength steel plate can be applied in the industry at present. This technology integrates a process of forming, heat transfer and microstructure transformation, mainly using the characteristics of high temperature austenite state, which increases the plasticity of sheet metal and decreases the yield strength, and quenching in the forming die through the die.

     

     

     

     

    To sum up, although there are some defects in stamping process, many industries cannot do without stamping process, which is also a very important part of China’s industry. With the diversification and individualization of market demand, many stamping parts produced by traditional technology are completed by laser cutting, NC punching, bending and rolling, which can improve flexibility, reduce die cost and meet the needs of small batch and various varieties, which will become the future development trend.

    The stamping industry needs constant ideological innovation, which involves not only enterprise managers, but also technical personnel’s ideological transformation. We must broaden our horizons and correct old ideas, and we must not wander around in the thought of “just making money and making it”, but also have the concept, courage and courage of “maximizing challenges and satisfying benefits”. Constantly innovate in products, materials and processes to make due contributions to the development of the industry.

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