What is accumulated material in precision casting?

What is accumulated material in precision casting?

Accumulation of materials is not simply the accumulation of materials, it is not simply an increase in the number of layers. So, what is accumulated material? Today, precision casting manufacturer Tianyao Metal will talk to you about what accumulation material is.

The surface of some parts of the precision casting shell is relatively rough, with large particles present. Touching it with your hand will definitely give a rough and rough feeling, handle it; And some parts do not have powder accumulation, which is the difference between the accumulation part and the surrounding area.

1、 How is this accumulation of material produced?

In some cases, the final sealing layer control material is not poured completely, resulting in the accumulation of slurry. This is the result of uneven material control. I don't know if everyone often pays attention. Some people often see a daze on the surface layer after the sand hanging operation, some on the sprue, and some on the wax mold. This is actually a problem of uneven material control. Sometimes the control material keeps flipping, which means that the coating forms a layer of uniform thickness film on the surface of the wax mold module. If the operation is not appropriate, it will form a bump, which is actually a kind of material accumulation. In fact, what we mean by material accumulation is an incorrect operation method that leads to an endless increase in the thickness of the mold shell under the same production conditions.

2、 What are the consequences of this accumulation of material?

2.1 It inexplicably increases the wall thickness of the shell, leading to an increase in heat dissipation resistance, which is actually poor heat dissipation;

2.2 It increases the accumulation of slurry, but in fact, the accumulation of refractory powder leads to poor local permeability of the casting.

We know that the solidification of castings is a complex process with many influencing factors. Such operations can cause uncontrolled solidification of castings, which may lead to defects such as shrinkage, porosity, and insufficient pouring, resulting in the final scrapping of castings.

Precision machining