Precision casting technology requirements
For example, sand casting, a large number of production factories should create conditions using advanced technology design, core making method. Old shock or jolt squeeze moulding machine production line productivity is not high enough, high labor intensity of workers, large noise, does not meet the requirement of mass production should be gradually change. For small castings, can adopt horizontal type or vertical type box without high pressure molding machine production line, mould production efficiency and high, covers an area of less; for parts can be made of various box high pressure molding machine production line, air impact molding line, in order to meet the requirements of rapid and high precision molding line, core making method can choose: cold core box, hot core box, shell core of high core method.
The application of resin self hardening sand molding and core making can be considered in the medium batch of large castings.
Single piece and small batch production of heavy castings, manual modeling is an important method, manual modeling can adapt to a variety of complex requirements are flexible, does not require a lot of technology and equipment. Can be used with water glass sand, VRH water glass sand, organic ester water glass self hardening sand, clay, resin self hardening sand and cement sand; for the production of a single piece of heavy castings, the pit molding method has the advantages of low cost and fast operation.
Batch production or long-term production of stereotypes products using multi box modelling, split box modeling method is more appropriate, although mould, sand box, etc to start high investment, but can be compensated from saving form of working hours and improve the quality of the products. Low pressure casting, die casting, centrifugal casting and other casting methods, because of the expensive equipment and tooling, so it is only suitable for mass production. Conditions method should be suitable for example is also in the production of large machine tool bed casting, core assembly modeling method is commonly used, do not make the appearance and sand box, in the pit of cores; and another factory used the sand box modelling method, and making the appearance.
Different production conditions of the enterprise (including equipment, site, the quality of the staff, etc.), a habit of producing, the accumulated experience each are not identical, should according to these conditions are considered suitable for what products and is not suitable for (or not) do what products. Accuracy requirements and cost of various casting methods to obtain the casting accuracy is different, the initial investment and productivity are not consistent, and the final economic benefits are also different. Therefore, to do more, fast, good, province, it should take into account all aspects. In response to the selection of casting methods to carry out a preliminary cost estimation, to determine the economic benefits of high and can ensure the casting requirements of the casting method.
