Improvement measures for flow patterns in precision casting wax molds

Improvement measures for flow patterns in precision casting wax molds

What is precision casting wax pattern flow pattern? Flow pattern is the trace or trajectory pattern left by the flow of wax. The flow pattern of a wax mold is the mark left by the fusion and fusion of paste or liquid wax when the wax flow enters the mold cavity and the material flow mixes during injection or injection. To solve the problem of flow patterns, it is necessary to understand the causes. Today, precision casting manufacturer Tianyao Metal will talk about the improvement measures for wax pattern flow patterns.

The injection port is not only responsible for casting and molding, but also for the surface quality of the wax parts and the exhaust of the mold. To be able to inject a intact wax piece, a combination of temperature, pressure, injection speed, and holding time is required. However, if the wax injection port design is unreasonable, even with other combinations, the qualification rate of the wax component will not be very high.

How to design the wax injection port of precision casting wax parts to reduce the generation of flow lines? As for molds, the first step is to form them, one is to consider not shrinking, and the other is to consider not missing them. These are actually two types of products.

1. Shrinkage generally refers to thick and large parts (or locally thick areas). Therefore, its injection port is usually located at the gate position or at the thicker part of the casting, in order to supplement the wax part (in fact, wax parts are basically similar to castings, and wax parts in the shrinkage area of the casting will also shrink). In addition, it will not cause the wax part to be missing meat due to breaking the wax injection port.

2. For indispensable parts, it generally refers to thin-walled parts. When producing thin-walled parts, in addition to forming, exhaust must also be considered. If the mold exhaust is not good, it may hold air and still cannot obtain a complete wax part. So, its injection port design may need to balance both, of course, the design is the best on the gate, but it may not necessarily be the best for wax molding.

In summary, the injection port of the wax mold should not be directly facing the mold core as much as possible. All injection port designs that hinder the wax material process are not good designs. The opening of the wax injection port in the mold should be based on comprehensive considerations, rather than simply feeding the wax material into the mold.

Precision machining