The first thing to do every day in shell production in precision casting

The first thing to do every day in shell production in precision casting

What is the first thing to do every day when making shells in precision casting? The monitoring of coating parameters includes wax shavings in the coating, material clusters in the transition layer and back layer coatings, and material clusters in the sand bucket. Today, precision casting manufacturer Tianyao Metal will talk to you about the first thing to do in shell making production every day.

Under normal circumstances, the surface layer mainly comes into contact with the wax mold module, and it is inevitable that wax shavings will mix into the material bucket. Sometimes, if the parting agent and cleaning agent are not washed clean, they will also mix into the surface layer coating (of course, this situation is absolutely not allowed). If the surface layer is operated with a floating sand bucket, it is inevitable that paint droplets will drip into the sand bucket, forming sand clusters; The probability of sand clumps mixing into the transition layer and back layer slurry is higher, and there are also more sand clumps in the floating sand bucket. These are all hidden dangers to the quality of shell making, so they must be cleaned up before mold shell production.

Before shell production, it is necessary to first check whether the viscosity of the coating is within the range controlled by the process documents. However, in the presence of the above phenomenon, it is obvious that the viscosity test is a pseudo parameter and not a real one. For example, the presence of parting agents or cleaning solutions in the surface layer slurry may lead to a decrease in slurry quality or cause gelation, resulting in viscous slurry and wax particles adhering to the mold, resulting in a succulent casting; There may be sand clumps in the slurry, and the viscosity may increase or cannot be measured by the flow cup. The material clumps in the sand bucket may increase the local thickness of the mold shell, causing poor heat dissipation and shrinkage of the casting. It may also lead to internal bridging of the casting hole position, resulting in leakage of the mold shell after pouring. These are all risks that should be avoided in shell making production.

There is a sentence in a casting manual that more than 50% of casting defects in investment casting come from shell making operations. The role of the shell making process in the entire investment casting process is evident. However, many investment casting enterprises do not pay enough attention to shell production, resulting in fluctuations and instability in the quality of castings. Furthermore, most investment casting enterprises still maintain manual operations and manual control, which makes it difficult to achieve stable quality in shell production, making the maintenance of casting quality a mere talk. Shell making is a very complex process with many human factors. As a low-level supervisor, one should be meticulous and consider all aspects of factors. Only in this way can uncontrollable factors be minimized.

Precision machining