A kind of preparation technology of tubular casting

Abstract

Disclosed is a tubular casting. The tubular casting comprises a tubular body and an accommodating cavity formed in the middle of the tubular body. The tubular body comprises a cast pipe and a die-cast pipe, wherein the cast pipe is provided with a first circumferential surface and a first inner circular surface, the die-cast pipe is provided with a second circumferential surface and a second inner circular surface, and the second inner circular surface of the die-cast pipe covers the first circumferential surface of the cast pipe. The invention relates to a production process of the tubular casting. The method comprises performing primary casting molding on a sand core to obtain the cast pipe and then taking the cast pipe as the inner core of a die-casting process. Due to the fact of being made of a surface-dense light metal alloy structure, the cast pipe can bear high pressure generated by the die-casting process when serving as the inner core relative to the relatively structurally loose sand core and can ensure no deformation to reduce the rejection ratio of tubular casting products produced through the die-casting process, so that the die-casting process can be widely applied to producing the tubular casting and have a wide application prospect.

Description

technical field [0001] The invention relates to the field of processing light metal alloy products, in particular to a preparation process of tubular castings. Background technique [0002] Die casting is a metal casting process characterized by the use of mold cavities to apply high pressure to molten metal. Molds are usually machined from stronger alloys, a process somewhat similar to injection molding. Most die castings are ferrous, such as zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys and their alloys. Because the die-casting process is generally only used to mass-produce a large number of products. Manufacturing die-cast parts is relatively easy, generally requiring only four major steps with low incremental cost per item. Die casting is especially suitable for manufacturing a large number of small and medium-sized castings, so die casting is the most widely used of various casting processes. Compared with other casting technologies, the surface ...

AI Technical Summary

Problems solved by technology

[0004] At present, sand cores are often required to cast tubular castings, and the use of die casting to manufacture tubular castings often requires great pressure on the sand cores. However, due to the loose shape of the sand cores, it is easy to be deformed under pressure, which will lead to die casting. The resulting casting cavity is not fixed, and it is difficult to achieve consistency with the target product, resulting in a high scrap rate, and the product quality is even inferior to that obtained by conventional casting

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