Improvement of precision casting silica sol shell making process

author: kevin

2024-06-10

Improvement of precision casting silica sol shell making process

The saying we often say is that the stones on other mountains are hard and can be used to polish jade. It metaphorically refers to talented individuals from other countries who can serve their own country, as well as individuals or opinions who can help correct their own shortcomings. Here, we can actually draw what we need from other people's articles.

1、 The composite shell process has reference value for manufacturers who still use water glass adhesives. For most investment casting manufacturers who use water glass quartz sand to produce shells, composite shells are used to improve the surface quality of castings. However, the quartz sand on the back layer cannot avoid the temperature of 573 ℃. Even if the calcination can smoothly transition, it is possible for the shell to rapidly drop to this temperature after being released, and the phase transition of quartz can cause cracks in the shell. In the previous tweet, there was an example where a friend's quartz shell cracked completely after being fired, probably not exceeding the 573 ℃ threshold. So, this article mentions the use of kaolinite clinker instead of quartz sand powder. It not only improves the strength of the shell, but also accelerates the production progress. The later stage shell collapse is good, and it has avoided the 573 ℃ threshold. In fact, isn't the current low-temperature wax silica sol shell just a replacement of the adhesive?

2、 Surface spraying. Actually, have we been seeking solutions to the wetting of silica sol coatings and wax mold modules? This is not easy to come by. We talk about using a brush or compressed air to blow in the textbook, so why not use this method? Just use a spray can and spray the surface layer of silica gel on it. Whatever the font or groove, it's all done. Isn't wetting the liquid driving away the gas? I use strong air to spray the paint onto the corners, grooves, and bumps. I don't believe it wets well. So, this is a good way to solve the defect of iron beans.

3、 We often encounter small holes, non holes, narrow grooves, and the like, which are all high difficulty for the shell making process. Shell making is difficult, drying is difficult. We often encounter various difficulties in production practice, but our cognitive scope or knowledge is slightly limited.