Food equipment hardware castings

Precision casting refers to the general term for the process of obtaining precision-sized castings. Compared with the traditional sand casting process, the casting size obtained by precision casting is more accurate and the surface finish is better. It includes: investment casting, ceramic mold casting, metal moldPrecision cast steel, Pressure casting, lost foam casting.

Precision casting is also calledLost wax casting, Its products are precise, complex, close to the final shape of the part, and can be used directly without processing or with little processing. Therefore, investment casting is an advanced technology with near net shape.

It includes: investment casting, ceramic mold casting, metal mold casting, pressure casting, and lost foam casting.

One of the more commonly used is investment casting, also known as lost wax casting: choose suitable investment materials (such as paraffin) to make investment molds; repeat the steps of dipping refractory paint and sprinkling refractory sand on the investment mold, hardening the shell and drying; then Melt the inner investment mold to obtain a cavity; bake the mold shell to obtain sufficient strength and burn off the remaining investment material; cast the required metal materials; solidify and cool, and remove the sand after removing the shell to obtain a high Precision finished product. According to product needs or heat treatment, cold processing and surface treatment.

Since investment casting was used in industrial production in the 1940s, it has been developing at a relatively rapid rate for half a century. Especially European and American countries are developing rapidly. Investment casting is used in the aviation and weapons sectors, and is used in almost all industrial sectors, especially in electronics, petroleum, chemical, energy, transportation, light industry, textiles, pharmaceuticals, medical equipment, pumps and valves. my country has also developed rapidly in recent years.

The development of investment technology enables investment casting not only to produce small castings, but also to produce larger castings. The outline size of the largest investment casting is nearly 2m, while the minimum wall thickness is less than 2mm. At the same time, investment castings are becoming more precise. In addition to linear tolerances, parts can also achieve higher geometric tolerances. The surface roughness of investment castings is getting smaller and smaller, which can reach Ra0.4μm.

Condition method should be suitable

For example, it is also the production of large-scale machine bed and other castings. Generally, the core assembly method is adopted, instead of making the pattern and sand box, the core is assembled in the pit; while in other factories, the sand box modeling method is used to make the pattern. Different companies have different production conditions (including equipment, site, staff quality, etc.), production habits, and accumulated experience. Based on these conditions, we should consider what products are suitable and what products are not suitable (or not).

Guangdong alloy steel castingPrecision requirements and cost

The accuracy of castings obtained by various casting methods is different, the initial investment and productivity are also inconsistent, and the final economic benefits are also different. Therefore, in order to be more, faster, better, and less expensive, we should take all aspects into consideration. A preliminary cost estimate should be made for the selected casting method to determine the casting method that has high economic benefits and can guarantee the requirements of the casting.

Although the development of my country’s foundry industry is in a relatively difficult period, from a long-term perspective, there is still hope for the development of my country’s precision casting industry. The market demand has slowly begun to pick up, and with the addition of my country’s foundry industry We believe that my country’s foundry industry will surely achieve gratifying results with the development of its strong strength.