Precision castingOne of the more common ones is investment casting, Also known as lost wax casting: use suitable investment raw materials (such as paraffin) to make investment molds; repeatedly dip fireproof architectural coatings and sprinkle fireproof sand on the investment molds, hard-bottomed shells and dryness; The internal investment mold is melted to obtain a concave mold; the shell is burned to obtain sufficient compressive strength and the remaining investment mold raw materials are burned; the metal composite material necessary for casting; condensation and cooling, and sand removal after molting, and then obtain High-precision finished products. Depending on the product, it is necessary to carry out quenching and tempering treatment, cold drawing and metal surface treatment.

Many manufacturing factories should give full play to their strengths and choose excellent technical modeling design and core-making methods. The old-style shock-type or shock-type molding machine production line has insufficient production efficiency, high labor efficiency and loud noise, and is not suitable for many manufacturing regulations. It should be gradually updated in many aspects. For small and medium-sized castings, the boxless high pressure molding machine production line can be selected for horizontal parting or vertical parting. The solid shape design has high productivity and less space; for middle parts, a variety of boxed high pressure molding machines can be used. Compression molding machine production line and air-punch molding design line are integrated into the requirements of rapid and high-precision molding design production line. Core-making methods can be: cold-core box, hot-core box, shell core and other core-making methods.

Precision casting method refers to the general term for casting methods that use non-metallic materials to mold, and the product specifications are more precise than ordinary sand mold castings. It includes three categories: dewaxing method, plaster mold method, and porcelain mold method. Among them, there are two types of dewaxing casting methods: solid core mold method and pottery shell mold method, and the latter is an improved method of the previous one. The pottery shell mold method is commonly used by practitioners of dewaxing precision castings at this stage, because it has the following advantages:

(1) The most reliable specifications

(2) The demand for refractory insulation materials is less

(3) Lighter weight, easy to transport, solve, and make large castings

(4) The process can be partially automated to save human resources and increase the speed of production

(5) Lower product cost

(6) The pottery shell mold is thin, and the cooling speed of the castings after casting is high and symmetrical, so the mechanical equipment characteristics are the best.