Three most concerned aspects about investment casting

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Three most concerned aspects about investment casting

Postby megan2008 » Mon Oct 28, 2013 10:31 am

Casting is the foundation of modern machinery manufacturing industry is one process, so the development of the foundry industry marks a country's production capabilities. China currently has become one of the world's great powers and has made great achievements on foundry machinery,and foundry machinery manufacturing industry in recent years.With the wide applications of investment casting,more and more people pay attention to three questions about investment casting:

The Kinds of Surface Finishes:

Because the ceramic shell is assembled around smooth patterns produced by injecting wax into a polished aluminum die, the final casting finish is excellent. A 125 microfinish is standard and even finer finishes (63 or 32) are not uncommon on aircraft engine castings. The size of shot particles used also factors into the final surface finish.

Individual metalcasting facilities have their own standards for surface blemishes, and facility staffs and design engineers/customers will discuss these capabilities before the tooling order is released. Certain standards depend on a component’s end-use and final cosmetic features.

The payment of Investment Castings:

Due to the costs and labor with the molds, investment castings generally have higher costs than forged parts or sand and permanent mold casting methods. However, they make up for the higher cost through the reduction of machining achieved through as-cast near-net-shape tolerances. One example of this is innovations in automotive rocker arms, which can be cast with virtually no machining necessary. Many parts that require milling, turning, drilling and grinding to finish can be investment cast with only 0.020-0.030 finish stock.

Further, investment castings do not need taper to remove the components because the ceramic shells are cracked off the part. This can allow castings with 90-degree angles to be designed with no shrink build included and no additional machining to obtain those angles.

The Parts For Make Investment Casting Practical:

This number depends on how many casting runs will occur. If there is a run size of 50 that will be produced 10 times per year, the tooling costs for the wax patterns likely will be well paid off after the 10th run. Further, no additional repairs need to be made to the tool because wax does little to cause wear defects to the tool material. Generally, machine toolmakers say that the logical part count to pay off a tool is at least 25 castings. Once a tool is purchased, it likely needs only one or two pieces at a time for replacements.

electrical castings:
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