Development of systematic integration of plastic mold making

Modern mold manufacturing technology is developing in the direction of accelerating information drive, improving manufacturing flexibility, agile manufacturing and system integration.

First, high-speed milling: the third generation of molding technology

High-speed milling not only has high processing speed, good processing precision and surface quality, but also has low temperature rise (the workpiece is only increased by 3 °C) compared with the traditional cutting process, and the thermal deformation is small, so it is suitable for temperature and thermal deformation. Processing of sensitive materials (such as magnesium alloys); also due to the small cutting force, can be applied to the processing of parts with thin walls and poor rigidity; reasonable selection of Tools and cutting amount can achieve a series of advantages such as processing of hard materials (HRC60). Therefore, high-speed milling technology is still a hot topic at present, and it has developed into a higher agility, intelligence, and integration, becoming the third-generation molding technology.

Second, EDM milling and "green" product technology

From the point of view of foreign electric machining machines, the performance, process index, intelligence, and automation have reached a very high level. At present, the new trend in foreign countries is to perform EDM milling technology (EDG processing technology). Research and development, this is a new technology to replace the traditional cavity machining with shaped electrodes. It is a simple tubular electrode rotating at high speed for 3D or 2D contour machining (like CNC milling), so no longer need to manufacture. Complex shaped electrodes, which is clearly a major development in the field of EDM.

At the same time as the advancement of EDM technology, the safety and protection technology of EDM has received more and more attention. Many electric machine tools have considered safety protection technology. At present, the European Community has stipulated that machine tools without the “CE” mark cannot enter the European Community market, and the international market is paying more and more attention to the requirements of safety protection technology. 

Third, the new generation of mold CAD / CAM software technology

The new generation of mold software should be based on a large amount of knowledge summarized from the mold design practice. This knowledge has been systematically and scientifically organized and stored in a specific form in the engineering knowledge base and can be easily called by the mold. With the support of intelligent software, mold CAD is no longer an imitation of traditional design and calculation methods, but under the guidance of advanced design theory, the full use of the rich knowledge and successful experience of experts in this field, the design results must be reasonable Sex and advanced.

The new generation of mold software designs the mold structure with three-dimensional thought and intuitive feeling. The generated three-dimensional structure information can be conveniently used for mold manufacturability evaluation and numerical control processing, which requires the mold software to shape and shape the parameters in three dimensions. Process simulation, CNC machining process simulation and information exchange and organization and management have achieved a fairly complete level and a high level of integration. Measuring the level of software integration depends not only on whether the functional modules are complete, but also whether these functional modules share the same data model, whether a global dynamic database is formed in a unified manner, and comprehensive management and sharing of information is realized to support mold design. The entire process of manufacturing, assembly, inspection, testing and commissioning. The function of mold manufacturability evaluation is very important in the new generation of mold software. It is necessary to screen multiple plans, evaluate the rationality and economy of the mold design process, and provide modification basis for mold designers.

Fourth, advanced rapid mold manufacturing technology

1. Laser rapid prototyping technology (RPM) develops speed, and China has reached international level and gradually realized commercialization. The rapid prototyping processes that have been commercialized in the world mainly include SLA (stereolithography), LOM (layered separation manufacturing), SLS (selective laser sintering), and 3D-P (three-dimensional printing).

2. The moldless multi-point forming technology is another advanced manufacturing technology for replacing the traditional mold with the height-adjustable punch group. The moldless multi-point forming system is based on CAD/CAM/CAT technology, which is fast and economical. Realize the automatic forming of 3D curved surfaces. Jilin University of Technology has undertaken the national key scientific and technological research project on moldless forming, and has independently designed and manufactured the moldless multi-point forming equipment with international leading level.

3. The resin stamping die was successfully applied in the trial production of domestic cars for the first time. FAW Mould Manufacturing Co., Ltd. designed and manufactured 12 sets of resin molds for the modification of the new Xiaohongqi sedan. These 12 sets of molds are the drawing molds for large and complex internal and external coverings such as luggage, hood, front, rear, left and right fenders. The main feature is that the mold profile is based on the main model of CAD/CAM processing, and is cast by high-strength resin refined by Ciba. The gap between the convex and concave molds is accurately controlled by imported special wax sheets. The dimensional accuracy of the mold is high. The cycle can be shortened by one-half to two-thirds, and the manufacturing cost can be saved by about 10 million yuan (12 sets of molds). It has opened up a new way for China's car trial production and small batch production, which is the first in China. Experts from the Swiss Ciba Refinement believe that it can reach the international level in the 1990s.

5. On-site mold inspection technology

The development of precision molds is increasingly demanding measurement. Precision CMMs have long been limited by the environment and are rarely used in production sites. The new generation of three-coordinate measuring machine basically has temperature compensation and anti-vibration materials to improve dustproof measures, improve environmental adaptability and reliability, so that it can be easily installed in the workshop to achieve on-site measurement. .