Machining processes and technology
Precise machining can be divided into upper and lower die methods, which can be completed through comprehensive processes such as planing, milling, etching, turning, and electric spark machining. The dimensions and pit shapes of precise machining are consistent with the product's edges. When used, because wax molds are mainly used for industrial wax pressing, the selection criteria prioritize low melting point, low hardness, low cost, and light weight; therefore, aluminum alloy materials are often used for the molds.
After the first two sandblasting processes and natural air drying, the precise machining process continues with a third, fourth, and fifth sandblasting, and so on. The number of sandblasting processes is adjusted according to the size, surface requirements, and weight of the workpiece. Generally, the number of sandblasting processes ranges from 3 to 7 times.
In precise machining, multiple wax molds on the fixed mold head are coated with industrial adhesive and then evenly sprayed with a layer of fine sand. This sand has very small and fine particles, making the surface of the blank as smooth as possible. After sandblasting and natural air drying, industrial adhesive is applied to the surface of the wax mold, followed by spraying a layer of sand with larger and coarser particles than the previous layer. After spraying, the wax mold is allowed to air dry at a set constant temperature.
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