请输入您要查询的百科知识:

 

词条 investment casting
释义
investment casting
precision-casting technique for forming metal shapes. A typical process for bronze castings involves six steps:
1. A gelatin mold is formed around the solid sculptured form.
2. The mold is removed (in two or more sections) from the sculptured form, and the inside of the mold is filled with wax or coated with a layer of wax of the same thickness as that desired for the final casting.
3. The outer gelatin mold is then removed, and a second mold, of heat-resisting clay, is formed around the wax shell, the interior of which is filled with a clay core.
4. The mass is baked, hardening the clay and melting the wax, which runs off through openings in the outer mold.
5. The hardened mold is packed in sand, and molten bronze is poured through the openings to fill the space vacated by the lost wax.
6. The mold is broken, and the bronze form remains.
In modern foundries, plastics (plastic), or occasionally frozen mercury, are used in place of the wax. Coated with a refractory cement instead of clay, the mold is packed in a porous cement, dried, and heated. The plastic melts, leaving cavities to be filled with molten metal. For all except the smallest forms, the molds are usually made in sections. The process is used for manufacturing jewelry, dentures, sculpture, and many small industrial parts that require minutely precise details. See also lost-wax process.
随便看

 

百科全书收录100133条中英文百科知识,基本涵盖了大多数领域的百科知识,是一部内容开放、自由的电子版百科全书。

 

Copyright © 2004-2023 Newdu.com All Rights Reserved
更新时间:2025/4/10 1:57:11