The precision of castings obtained by various precision casting methods is not the same, the initial investment and productivity will not be consistent, and the final economic benefits will also be different. Therefore, in order to achieve more, faster, better, province, we must take into account all aspects. A preliminary cost estimate should be made for the selected precision casting method to determine the precision casting method with high economic benefits and to ensure the casting requirements. Although the precision casting industry development in our country is still in a difficult period, but from a long-term point of view of precision casting, precision casting industry development in our country still has a lot of hope, market demand has been slowly began to recover, and combined with the development of casting industry in China has abundant strength, believe that the casting industry in China will be a remarkable achievements.

Experts said, to fundamentally improve the level of precision casting technology, we must do the following four points: first, pay attention to the improvement of precision casting equipment technology.In terms of technology, the problem of equipment is very critical. For example, some directional solidification equipment is mainly imported, so the research and development of precision casting equipment is the focus.Second, the importance of precision casting material research and development.Materials are the foundation of industry, and there is still much work to be done.In the field of aeronautics and astronautics, the research and smelting technology of alloy materials, especially some new materials such as high-temperature alloys, need to be improved.Third, in addition to the enhancement of innovation consciousness and research and development ability, enterprises' independent innovation should also attach importance to and strengthen the combination of "production, study and research" with precision casting enterprises as the main body.Fourth, the development of simulation technology, improve the accuracy of the prediction, strengthen process control, improve the yield.Regular problems are not well mastered, thus affecting the yield in batch production.In precision casting, investment casting is more commonly used, also known as lost wax casting.Repeat dipping refractory coating and sand spraying on the investment mold, hardening shell and drying;Then melt the internal mold to get the cavity;Roasting the shell to obtain sufficient strength and burning off the residual investment materials;Metal materials required for pouring;Solidification cooling, dehulling after sand cleaning, so as to obtain high-precision finished products.According to the product needs or heat treatment and cold processing and surface treatment.For example, sand casting, mass production plants should create conditions for the use of advanced technology modeling, core-making methods.The production line of the old shock-type or shock-compaction moulding machine is not high enough in productivity, the labor intensity of workers is high and the noise is large, which cannot meet the requirements of mass production.For small castings, the production line of no-box high-pressure molding machine with horizontal or vertical parting can be used.In order to meet the requirements of the rapid and high-precision molding production line, we can choose various high pressure molding machine production line and air impact molding line for the middle part. We can choose the following core manufacturing methods: cold core box, hot core box, shell core and other efficient core manufacturing methods.

  Resin self - hardening sand molding and coring can be considered for large castings of medium batch.For heavy castings produced in small batches, manual molding is still an important method. Manual molding can adapt to various complex requirements, which is more flexible and does not require a lot of process equipment.It can be applied to sodium silicate sand mold, VRH sodium silicate sand mold, organic ester sodium silicate self-hardening sand mold, clay dry mold, resin self-hardening sand mold and cement sand mold.For heavy castings produced by a single piece, the pit molding method has low cost and fast production.Bulk production or long-term production of finalize the design of the product using multi-box modeling, split box modeling method is more appropriate, although the mold, sand box and other beginning investment is high, but can be saved from modeling man-hours, improve product quality to get compensation.Low pressure casting, die casting, centrifugal casting and other casting methods, due to the high cost of equipment and mold, so only suitable for mass production.