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当前位置:不锈钢铸件生产工艺
[来源:www.hslcasting.com.cn] [作者:精密铸造] [日期:18-09-04]

不锈钢铸件生产工艺
Production technology of stainless steel castings
所谓熔模铸造工艺,简单说就是用易熔材料(例如蜡料或塑料)制成可熔性模型(简称熔模或模型),在其上涂覆若干层特制的耐火涂料,经过干燥和硬化形成一个整体型壳后,再用蒸汽或热水从型壳中熔掉模型,然后把型壳置于砂箱中,在其四周填充干砂造型,最后将铸型放入焙烧炉中经过高温焙烧(如采用高强度型壳时,可不必造型而将脱模后的型壳直接焙烧),铸型或型壳经焙烧后,于其中浇注熔融金属而得到铸件。
The so-called investment casting process, in short, is to use fusible materials (such as wax or plastic) to make a fusible model (for short, investment mold or model), coated with a number of layers of special refractory coatings, after drying and hardening to form a whole shell, then with steam or hot water from the shell melt model, and then the shell. Place the mold in the sand box and fill it with dry sand. Finally, put the mold into the calciner and bake it at high temperature (for example, when the high strength mold shell is used, the mold shell can be baked directly without molding). After baking, the mold or shell can be cast with molten metal.
熔模铸件尺寸精度较高,一般可达CT4-6(砂型铸造为CT10~13,压铸为CT5~7),当然由于熔模铸造的工艺过程复杂,影响铸件尺寸精度的因素较多,例如模料的收缩、熔模的变形、型壳在加热和冷却过程中的线量变化、合金的收缩率以及在凝固过程中铸件的变形等,所以普通熔模铸件的尺寸精度虽然较高,但其一致性仍需提高(采用中、高温蜡料的铸件尺寸一致性要提高很多)。
The dimension precision of investment casting is higher, generally up to CT4-6 (sand casting is CT10-13, die casting is CT5-7). Of course, due to the complex process of investment casting, there are many factors affecting the dimension precision of the casting, such as the shrinkage of the mold, the deformation of the investment mold, the linear change of the shell during heating and cooling, the shrinkage of the alloy. As well as in the solidification process of casting deformation, so although the ordinary investment casting size accuracy is higher, but its consistency still needs to be improved (using medium and high temperature wax casting size consistency to improve a lot).
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 investment mold, the high surface finish of the cavity is used, so the surface finish of the investment mold is also relatively high. In addition, the shell is made of high temperature resistant special binder and refractory, and the refractory coating is coated on the investment mold. The surface of the cavity directly contacted with the molten metal has high smoothness. Therefore, the surface finish of investment castings is higher than that of ordinary castings, generally up to Ra.1.6~3.2 m.

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