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About machine tool casting understanding
With the development of science and technology and the improvement of people's living standards, the machine tool casting manufacturing industry is faced with the accelerated renewal frequency of manufacturing objects and the prominent personalization of processing objects, so the machine tool industry which provides processing and manufacturing equipment also requires a variety of products, which has also become an important symbol to measure the comprehensive strength of a machine tool industry. There are many factors affecting the quality of machine tool castings.
1. The design process of machine tool castings. During the design, in addition to determining the geometric shape and size of machine tool castings according to working conditions and metal material properties, the rationality of the design should also be considered from the point of view of casting alloy and casting process characteristics. that is, obvious size effect and solidification, shrinkage, stress and other problems, in order to avoid or reduce the defects such as composition segregation, deformation and cracking of copper castings.
2. It is necessary to have reasonable casting technology. That is, according to the casting structure, weight and size, casting alloy characteristics and production conditions, the appropriate parting surface, modeling and core-making method are selected, and the casting reinforcement, cold iron, riser and gating system are set up reasonably. To get the castings.
3. Quality of raw materials for casting. The quality of metal charge, refractory, fuel, flux, modifier, casting sand, molding sand binder, coating and other materials are not up to standard, which will cause defects such as pores, pinholes, slag inclusion, sand sticking and other defects in castings, which will affect the appearance and internal quality of castings, and will make castings scrapped in serious cases.
The weight of large machine tool castings accounts for a large proportion, and many structural components and many main parts are made of castings, which are closely related to the quality and accuracy of machine tools.
