| 不锈钢精密铸造发展历程（2） |
| 添加时间：2019/8/14 10:17:57 浏览次数： |
| 压制熔模时，采用型腔表面光洁度高的压型，因此，熔模的表面光洁度也比较高。此外，型壳由耐高温的特殊粘结剂和耐火材料配制成的耐火涂料涂挂在熔模上而制成，与熔融金属直接接触的型腔内表面光洁度高。所以，熔模铸件的表面光洁度比一般铸造件的高，一般可达Ra.1.6~3.2μm。 When pressing the melting die, the high surface finish of the cavity is used, so the surface finish of the melting die is also higher. In addition, the shell is made of a refractory coating made of a special high temperature binder and refractory material, which is coated on the melting die. The inner surface of the cavity directly contacted with the molten metal has a high smoothness. Therefore, the surface finish of investment castings is higher than that of ordinary castings, generally up to Ra.1.6-3.2 um. 熔模铸造最大的优点就是由于熔模铸件有着很高的尺寸精度和表面光洁度，所以可减少机械加工工作，只是在零件上要求较高的部位留少许加工余量即可，甚至某些铸件只留打磨、抛光余量，不必机械加工即可使用。由此可见，采用熔模铸造方法可大量节省机床设备和加工工时，大幅度节约金属原材料。 The greatest advantage of investment casting is that because of its high dimensional accuracy and surface finish, it can reduce the work of mechanical processing. Only a little processing allowance can be left in parts with higher requirements. Even some castings can be used without mechanical processing. It can be seen that investment casting can save a lot of machine tools and processing time, and greatly save metal raw materials. 熔模铸造方法的另一优点是，它可以铸造各种合金的复杂的铸件，特别可以铸造高温合金铸件。如喷气式发动机的叶片，其流线型外廓与冷却用内腔，用机械加工工艺几乎无法形成。用熔模铸造工艺生产不仅可以做到批量生产，保证了铸件的一致性，而且避免了机械加工后残留刀纹的应力集中。 Another advantage of investment casting method is that it can cast complex castings of various alloys, especially superalloy castings. For example, the blade of jet engine, its streamlined outline and cooling chamber can hardly be formed by mechanical processing technology. Using investment casting technology can not only achieve batch production, ensure the consistency of castings, but also avoid the stress concentration of residual knife marks after machining. |
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