Introduction of investment castings

Update:22 Aug 2019
Summary:

When using wax to make a look, investment forging is al […]

When using wax to make a look, investment forging is also called "lost wax forging". Investment forging usually means that the smelting material is made into a shape, and the refractory material is coated in a profile to form a shell, and then the sample is melted and extruded into a shell, thereby obtaining a mold having no parting surface, and after being baked at a high temperature. A forging plan that can be filled with sand. Because it is generally made of waxy materials, it is often referred to as "wax forging".

The alloys that can be produced by the investment forging method include carbon steel, alloy steel, heat resistant alloy, stainless steel, compact alloy, permanent magnet alloy, bearing alloy, copper alloy, aluminum alloy, titanium alloy and ductile iron.

The shape of the investment casting is generally large, and the minimum diameter of the castable hole on the casting can be up to 0.5 mm, and the minimum wall thickness of the casting is 0.3 mm. In the production, some parts that are originally composed of several parts can be modified by the layout of the parts, and they are indirectly cast and cast by the investment mold, and the parts are processed by the throttling processing time and the loss of the metal materials. The layout is more reasonable.

 The weight of investment castings is usually a few tens of cattle (from a few grams to a dozen kilograms, usually not more than 25 kilograms), too heavy castings are more laborious to produce by investment forging.

The process of investment forging is relatively large, and it is not easy to control. The materials used and consumed are more expensive. Therefore, it is suitable for producing small parts with large shapes, high precision requirements, or difficult to stop other processing, such as blades of turbines.