Die is the basic process equipment of automobile industry, more than 90% of parts in automobile production need to rely on die forming. 3D mold design is an important part of digital mold technology, and it is the basis of mold design, manufacturing and inspection integration. Some foreign practices in mold 3D design are worthy of our reference. In addition to integrated manufacturing, another advantage of mold 3D design is that it is convenient for interference checking and motion interference analysis, which solves a difficult problem in 2D design. Mold software automotive mold management software solutions can help the development of the automotive industry to provide favorable assistance.
1、 Rapid development of digital mold technology
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 process of mold design and manufacturing. This paper summarizes the successful experience of applying computer-aided technology in automobile mould enterprises at home and abroad
The traditional 2D design is replaced by 3D mold structure design;
The technology of CAPP, cam and cat is used in the manufacturing process of mould;
Auxiliary technology of mold surface design, development of intelligent surface design technology;
Under the guidance of digital technology, solve the problems in the process of die testing and stamping production.
Design for manufacturability (DFM), that is, consider and analyze the manufacturability in the design to ensure the success of the process;
CAE aided analysis and Simulation of stamping process, prediction and solution of possible defects and forming problems;
2、 Increasingly important CAE Technology
With the rapid development of computer software and hardware, the simulation technology of stamping process (CAE) plays an increasingly important role. In many developed countries, CAE technology has become a necessary part of the die design and manufacturing process. It is widely used to predict the forming defects, optimize the stamping process and die structure, improve the reliability of die design and reduce the time of die test. Many domestic automobile mould enterprises have also made remarkable progress in the application of CAE and achieved good results. The application of CAE technology can greatly save the cost of die test and shorten the development cycle of stamping die, which has become an important means to ensure the quality of die. CAE technology is gradually changing mold design from experience design to scientific design.
3、 Advanced processing technology and equipment
Advanced processing technology and equipment is an important basis for improving productivity and ensuring product quality. In the advanced automobile mould enterprises, it is not uncommon to have CNC machine tools equipped with double worktables, automatic tool changer (ATC), photoelectric control system for automatic processing, workpiece online measurement system, etc. Numerical control machining has developed from simple surface machining to comprehensive machining of surface and structural surface, from medium and low speed machining to high speed machining, and the development of machining automation technology is very rapid.
4、 High strength steel widely used
High strength steel is widely used in automobile due to its excellent properties in yield strength ratio, strain hardening, strain distribution and impact energy absorption. At present, the main high strength steels used in automotive stamping parts are paint hardening steel (BH steel), dual phase steel (DP steel), transformation induced plasticity steel (TRIP steel), etc.
5、 Pressing technology of high strength steel plate
The soft steel series mainly composed of IF steel will be replaced by high strength steel series, and the high strength low alloy steel will be replaced by dual phase steel and ultra-high strength steel. 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 below 500 MPa. Therefore, it is an important problem to master the stamping technology of high strength steel plate in China's automobile die industry.
6、 Focus on the development of progressive die
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 a kind of high-tech die product, which is difficult in technology, high in manufacturing accuracy and long in production cycle. Multi position progressive die will be one of the key die products in China. The stamping parts with complex shape, especially some small and medium-sized complex stamping parts which need to be punched by multiple dies according to the traditional process, are increasingly formed by progressive die.
7、 Research and development of high performance die materials
The quality and performance of mold materials are important factors affecting the quality, life and cost of mold. In recent years, in addition to a variety of high toughness and high wear resistance cold work die steel, flame quenching cold work die steel, 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. Nodular cast iron has good strength, toughness and wear resistance. Its weldability, machinability and surface quenching performance are also good. Moreover, its cost is lower than that of alloy cast iron, so it is widely used in automobile stamping die.
8、 Scientific and information management
Another important aspect of the development of automobile mold technology is the scientific and information management. The scientific management makes the mold enterprises continue to develop in the direction of just in time manufacturing and lean production. The enterprise management is more accurate, the production efficiency is greatly improved, and the invalid organizations, links and personnel are constantly simplified. With the progress of modern management technology, many advanced information management tools, including enterprise resource management system (ERP), customer relationship management (CRM), supply chain management (SCM) and project management (PM), are widely used in mold enterprises.
9、 Fine manufacturing of mould
The so-called mold fine manufacturing is for the mold development process and manufacturing results, specifically for the rationalization of stamping process and mold structure design, high precision of mold processing, high reliability of mold products and strict technical management. Mold fine manufacturing is not a single technology, but a comprehensive reflection of design, processing and management technology. The realization of mold fine manufacturing depends not only on the improvement of technology, but also on strict management.