Wednesday, April 8, 2020

Development status and main problems of fine blanking die technology

Fine blanking technology has been invented in Europe in the 1920s and has gone through more than 80 years. It is one of the most important precision plastic forming methods for the manufacture of thick plates. It is an economical production of high-volume, high-quality, multi-functional ferrous metals. And non-ferrous metal parts with high technical content and good economic benefits. The fine blanking press completes a stamping process. Through the processing of the special fine blanking die, one or more pieces of high-precision shaped parts that can be directly used for assembly will be manufactured. They have been widely used in electronics, computers, power, and home appliances. , Automotive and aviation. According to incomplete statistics, at present, 40 countries in the world have adopted fine blanking technology, with a total of about 4500 fine blanking machines and about 10,000 parts produced. For example, in a car (car) including gear shift forks, seats and seat belt angle adjusters, planetary gears, brake shoes and steel back, there are nearly 100 kinds of fine blanking parts.
Development status and main problems of fine blanking die technology

China's fine blanking die technology has made great progress during the "Eleventh Five-Year Plan" period, and has achieved a series of scientific research results in fine blanking technology, materials, fine blanking presses, die holders, molds and lubrication. As of the end of 2008, there are nearly 20 provinces and cities in China with professional fine blanking production equipment, more than 80 fine blanking presses (excluding hydraulic formwork), more than 5,000 employees in fine blanking, and about 2000 types of fine blanking parts. And has formed several independent fine blanking die development demonstration base. Metal materials are expanded from non-ferrous metal punching to ferrous metal punching. The punching thickness of low carbon steel, low alloy steel and stainless steel reaches 12mm; the punching thickness of non-ferrous metals such as aluminum alloy and copper alloy reaches 18mm; with the advancement of mold materials and processing methods and the perfection of the spheroidizing process of punched plates With popularization, some harder high-carbon steels, high-alloy steels, and other low-toughness materials such as nickel-based or cobalt-based alloy materials have also begun to be used in the production of fine blanking parts. In addition, the proportion of self-developed progressive compound fine die, transfer die and modular die in domestic fine die has increased significantly. Especially the progressive compound fine die for complex parts of automobile transmission system has basically been localized. The research, development and application of finite element numerical simulation technology for fine blanking forming process, fine blanking die structure optimization technology, fine blanking die intelligent design and knowledge base technology have enhanced and enriched the technical connotation of fine blanking die in China. However, at present, fine blanking companies are generally small in size, dispersed in resources, low in production efficiency, lack of talents and incomplete. Although it has certain development capabilities in the development of fine blanking dies, there is still a lack of experience in the development of complex fine blanking dies, especially fine blanking composite forming dies, and imported dies still account for a large proportion

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