Precision Casting industry characteristics
Precision Casting is the most commonly used is the investment casting, also known as lost wax Precision Casting: the use of suitable melting materials (such as paraffin) made of investment mold; in the mold on the repeated wear refractory coating and sand-resistant sand, hardening shell and Drying; and then melt the internal melting of the mold, get the cavity; roasted shell to get enough strength, and burn the residual melting material, Precision Casting the required metal materials; solidification cooling, shelling after the sand, So as to obtain high-precision finished products. According to product needs or heat treatment and cold processing and surface treatment. Such as sand casting, mass production of the factory should create the conditions of the use of advanced technology modeling, core method. Vintage shock or shock pressure molding machine production line productivity is not high enough, workers labor intensity, noise, not suited to the requirements of mass production, should be gradually modified. For small Precision Casting, you can use the horizontal classification or vertical type of box-free high-pressure molding machine production line, real shape modeling production efficiency is high, covers an area of less; for the pieces can choose a variety of box high pressure molding machine production line, gas Punching line to meet the requirements of fast, high-precision molding production line, core method can be used: cold box, hot box, shell core and other efficient core method.
Medium batch of large Precision casting can be considered the application of resin from hard sand shape and core.
Single pieces of small batch production of heavy castings, hand shape is still an important method, hand styling can adapt to a variety of complex requirements more flexible, do not require a lot of technology and equipment. Can be applied to water glass sand type, VRH water glass sand type, organic ester water glass self-hardening sand, clay dry type, resin self-hardening sand and cement sand type; for single-piece production of Precision Casting, the use of pit molding method cost is low fast. Mass production or long-term production of stereotypes products using multi-box shape, split box molding method is more appropriate, although the mold, sand box and other investment began to high, but from the conservation of working hours, improve product quality to be compensated.
Low pressure casting, die casting, centrifugal casting and other casting methods, because the equipment and molds are expensive, so only for mass production.
The conditional method should be appropriate
For example, the same production of large machine bed and other Precision Casting, the general use of core modeling method, do not make the appearance and sand box, in the pit in the core; and other factories are used sand box modeling method, making the appearance. Different production conditions (including equipment, venues, staff quality, etc.), production habits, the accumulated experience of different, should be based on these conditions to consider what products and do not fit (or can not do what products.
Accuracy requirements and cost
Precision Casting methods obtained by the different precision of the casting, the initial investment and productivity are inconsistent, the final economic benefits are also different. Therefore, to do more, fast, good, province, it should take into account all aspects. A preliminary cost estimate should be made for the Precision Casting method chosen to determine the casting method that is economically efficient and ensures Precision Casting requirements.
Although China's foundry industry development in a more difficult period, but from a long-term point of view, China's Precision Casting industry development or have some hope that the market demand has slowly begun to pick up, and with China's foundry industry Development has a solid strength, I believe that China's foundry industry will certainly achieve gratifying results.
Experts said that to fundamentally improve the level of Precision Casting technology must do the following four points: First, the development of simulation technology to improve the accuracy of the forecast, to strengthen the process control, improve the yield. Regularity of the problem is not very good grasp, thus affecting the production rate in mass production. Second, the combination of production and research. Enterprise independent innovation in addition to enhance the sense of innovation and research and development capabilities to enhance, but also need to pay attention to and strengthen the Precision Casting enterprises as the main "production, learning, research" combination. Third, attention to material research and development. Material is the basis of industry, there is still a lot of work to do. In the field of aerospace, alloy materials, especially high temperature alloys and other new materials research, smelting technology has yet to be improved, and the gap is still large. Fourth, pay attention to the upgrading of equipment technology. Process is mainly the problem of equipment, a lot of key equipment, such as some directional solidification equipment is mainly dependent on imports, so Precision Casting equipment research and development is still the focus.