Investment casting core production process for turbosuperchager volute and pump parts

Abstract

The invention relates to an investment casting core production process for turbosuperchager volute and pump parts. The investment casting core production process for the turbosuperchager volute and pump parts adopts an investment casting process for producing a core, and comprises the following steps of (1) carrying out a wax mould pressing process; (2) carrying out a shell making process; (3) carrying out a dewaxing process; and (4) finishing. According to the investment casting core production process for the turbosuperchager volute and pump parts provided by the invention, the core is highin low-temperature strength and not easy to deform; the core is high in dimensional precision; the core is long in preservation period; the core is high in high-temperature strength and not easy to leak molten steel; the core is convenient to clean without the need for using a chemical method for clearing shells; the core is compact in structure; and the casting surface smoothness is high and canreach to Ra3.2 which is the same as general investment casting. According to the investment casting core production process for the turbosuperchager volute and pump parts provided by the invention, after a core rough blank is prepared, the core rough blank can be checked and repaired, so that the casting rejection caused by the core surface quality problem can be greatly reduced. According to theinvestment casting core production process for the turbosuperchager volute and pump parts provided by the invention, after the core is used, an inner cavity has no need to be dried, so that the shellmaking period can be greatly shortened, the shell turnover rate is improved, and the economic benefit is improved.

Description

technical field [0001] The invention relates to an investment casting core production process, in particular to an investment casting core production process for turbocharger volutes and pump parts with good core forming effect and low defective rate. Background technique [0002] Investment casting, also known as lost wax casting, can cast castings with high dimensional accuracy, high surface finish and complex shapes, such as advanced aeroengine hollow blades. The inner cavity of investment casting is generally formed by dipping slurry, sand showering, drying and other methods along with the shape. When the cavity of the casting is too narrow, complicated or difficult to dry, it is necessary to form the cavity with the help of a pre-prepared core. [0003] Classified according to the molding method of the core, its preparation methods generally include: grouting molding, injection molding, extrusion molding, hot pressing molding, etc. The above-mentioned methods have the...

AI Technical Summary

Problems solved by technology

The above methods have their own advantages and disadvantages. For example, the core prepared by grouting molding is easy to clean, but the structure is loose and cannot withstand the high pressure of wax mold pressing and the impact of high-temperature molten steel.

The core made by hot pressing has a compact structure and can withstand high wax mold pressing pressure, but it is troublesome to clean up, and it usually needs to be cleaned by chemical methods

Moreover, the cores of general materials, such as coated sand / resin sand cores, have a poor surface finish and cannot meet the special requirements of customers.