Digital mold technology has become the mainstream direction
In recent years, the rapid development of digital mold technology is an effective way to solve many problems in the development of automobile mold. The so-called digital mold technology is the application of computer technology or computer-aided technology (CAX) in the mold design and manufacturing process. The successful experience of applying computer aided technology in automobile die and mould enterprises at home and abroad is summarized
① Design for manufacturability (DFM) is to consider and analyze the manufacturability in the design to ensure the success of the process.
② The auxiliary technology of mold surface design, the development of intelligent surface design technology.
③ CAE aided analysis and Simulation of stamping process, predict and solve possible defects and forming problems.
④ The traditional two-dimensional design is replaced by three-dimensional mold structure design. ⑤ CAPP, cam and CAT technology are used in the manufacturing process of mould. ⑥ Under the guidance of digital technology, the problems in the process of die testing and stamping production are solved.
The rapid development of mold processing automation
Advanced processing technology and equipment is an important basis for improving productivity and ensuring product quality. In the advanced automobile mold enterprises, CNC machine tools with double worktables, automatic tool changer (ATC), photoelectric control system for automatic machining, and workpiece online measurement system are not uncommon. NC machining has developed from simple surface processing to comprehensive processing of profile and structural surface, from medium and low speed processing to high-speed processing, and the development of machining automation technology is very rapid.
High strength steel sheet stamping technology is the future development direction
High strength steel is widely used in automobiles because of its excellent properties in yield ratio, strain hardening characteristics, strain distribution ability and energy absorption. At present, the high strength steels used in automotive stamping parts mainly include bake hardening steel (BH steel), dual phase steel (DP steel), transformation induced plasticity steel (TRIP steel), etc. It is estimated that 97% of ulsab-avc will be made of high-strength steel, and the proportion of advanced high-strength steel in the whole vehicle will exceed 60%, and the proportion of dual phase steel will account for 74% of vehicle steel plate. Now a large number of IF steel based mild steel series will be replaced by high strength steel plate series, high strength low alloy steel will be replaced by dual phase steel and ultra-high strength steel plate. At present, the application of high strength steel plate for automobile parts in China is mostly limited to structural parts and beam parts, and the tensile strength of the materials used is mostly less than 500MPa. Therefore, it is an important problem to master the stamping technology of high strength steel sheet in China.
New mould products launched in time
With the development of high efficiency and automation of automobile stamping production, progressive die will be widely used in the production of automobile stamping parts. Progressive die is used more and more for the complex stamping parts with complex shape, especially for the small and medium-sized parts which need to be punched by multiple dies according to the traditional process. Progressive die is a kind of high-tech mould product, which is difficult in technology, high in manufacturing precision and long in production cycle. Multi position progressive die will be one of the key die products in China.
Die material and surface treatment technology will be reused
The quality and performance of die materials are important factors affecting the quality, life and cost of dies. In addition to a variety of high toughness and high wear resistance cold work die steel, flame quenching cold work die steel and powder metallurgy cold work die steel, the selection of cast iron materials in large and medium-sized stamping dies abroad is a development trend worthy of attention
About the author