1、mold manufacturing and the development trend of the mold mold manufacturing :The requirement of the mold design :the size should be exact ,surface should be clean ,structure should be reasonable ,high production efficiency ,easy automation ,long service life ,low cost ,etc. Rigidity, oriented, disch
2、arge institutions ,positioning method ,gap size etc. should be considered during the mold design and the coefficient selection .The replacement of wearing parts on the mold should be easy .High efficiency ,high precision ,high-life mold should be used in mass production . The selection of mold mater
3、ial: Mold material selection is a very important part of the process of making the mold .Mold material selection need to meet three principles: Mold should meet the wear resistance ； toughness and other work demands ；technical requirements ,and also ,mold should meet the economic applicability . Mol
4、d to meet the working conditions: Wear resistance: Blank in the mold cavity in the plastic denaturation , will be flowing and sliding along the cavity. So there will be a sharp friction between the cavity surface and the blank and it results in the mold to wear and failure. Thats why the wear resist
5、ance of the materials is one of the most important and basic performance of the mold. Hardness is the main factors of affecting the wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear, the better wear resistance. In addition, the wear resistance rel
6、ates with the type, quantity, shape, size and distribution of the carbide of the material. Strength and toughness: Most mold work in a very bad working conditions, some often bear a big impact load, which leads to brittle fracture. In order to prevent this situation, mold should have high strength a
7、nd toughness. The toughness of the mold material depends on the carbon content, grain size and organization of the state. Fatigue fracture performance: while the mold is working, the long-term effect of cyclic stress often leads to fatigue fracture. Fatigue fracture properties of the mold depends on
8、 its strength, toughness, hardness and the debris content of the material. High temperature performance: when the mold works in a high temperature, hardness and strength will decrease. It leads to early wear and failure because of plastic deformation. So the mold material should have high resistance
9、 to tempering stability in order to ensure the mold have a high hardness and strength in the operating temperature. Performance of the resistance to thermal fatigue: some mold in the state of repeating heating and cooling while working, which causes cracking and spalling of the cavity surface, incre
10、asing friction and hinder plastic deformation, reducing the dimensional accuracy. It leads to the failure of the mold. Thermal fatigue is one of the main form of failure of the mold, these mold should have a high resistance to thermal fatigue performance. Corrosion resistance: some molds such as pla
11、stic mold decomposes and precipitats HCl, HF and other strong corrosive gases after heated because of the chlorine and fluorine and other elements in the plastic. They will eroding the surface of the mold cavity, increasing its surface roughness, increase the wear failure. 7.Die trend 1. Mold CAD /
12、CAE / CAM being integrated, three-dimensional, intelligent and network direction (1) Mold software features integrated Die software features of integrated software modules required relatively complete, while the function module using the same data model, in order to achieve Syndicated news managemen
13、t and sharing of information to support the mold design, manufacture, assembly, inspection, testing and production management of the entire process to achieve optimal benefits. Series such as the UK Delcams software will include a surface / solid geometric modeling, engineering drawing complex geome
14、try, advanced rendering industrial design, plastic mold design expert system, complex physical CAM, artistic design and sculpture automatic programming system, reverse engineering and complex systems physical line measurement systems. A higher degree of integration of the software includes: Pro / EN
15、GINEER, UG and CATIA, etc. Shanghai Jiao tong University, China with finite element analysis of metal plastic forming systems and Die CAD / CAM systems； Beijing Beihang Haier Software Ltd. CAXA Series software； Jilin Gold Grid Engineering Research Center of the stamping die mold CAD / CAE / CAM syst
16、ems . (2) Mold design, analysis and manufacture of three-dimensional Two-dimensional mold of traditional structural design can no longer meet modern technical requirements of production and integration. Mold design, analysis, manufacturing three-dimensional technology, paperless software required to
17、 mold a new generation of three-dimensional, intuitive sense to design the mold, using three-dimensional digital model can be easily used in the product structure of CAE analysis, tooling manufacturability evaluation and CNC machining, forming process simulation and information management and sharin
18、g. Such as Pro / ENGINEER, UG and CATIA software such as with parametric, feature-based, all relevant characteristics, so that mold concurrent engineering possible. In addition, Cimatran company Mold expert, Delcams Ps-mold and Hitachi Shipbuilding of Space- E/mold are professional injection mold 3D
19、 design software, interactive 3D cavity, core design, mold base design configuration and typical structure . Australian company Moldflow realistic three-dimensional flow simulation software MoldflowAdvisers been widely praised by users and applications. China Huazhong University of Science have deve
20、loped similar software HSC3D4.5F and Zhengzhou University, Z-mold software. For manufacturing, knowledge-based intelligent software function is a measure of die important sign of advanced and practical one. Such as injection molding experts Cimatrons software can automatically generate parting direction based parting line and parting surface, generate products corresponding to the core and cavity, implementation of all relevant parts mold, and
