Method for preparing metal core for investment casting and precision investment casting method for aluminum alloy casting based on metal core

Abstract

The invention provides a method for preparing a metal core for investment casting and a precision investment casting method for an aluminum alloy casting based on the metal core. The method comprises the following steps that: the metal core is designed; a nickel-based or iron-based high temperature alloy is processed into the designed metal core by a slow-feeding wire-cut method, and the surface of the metal core is ground and polished; the ground and polished metal core is fixed in a mould and then is cast to form an investment pattern; the investment pattern is coated, dewaxed, roasted and subjected to shell blowing; an aluminum alloy solution is smelted, and then, a mould shell for wrapping the metal core is poured; the mould shell is cleaned by a hydraulic shell cleaning machine; and after the residual mould shell is removed from an inner cavity, the mould shell is immersed by water, and the metal core is taken out by a fixture. By the method for preparing the metal core for the investment casting, many problems of low surface roughness of a sand mould, low strength of a plaster core and oxidization of a copper core for investment casting during mould shell roasting are solved, the problems of complicated working procedures and low yield rate are solved, and the aluminum alloy casting meeting technical requirements is produced.

Description

technical field [0001] The invention belongs to the field of precision equipment manufacturing, and in particular relates to a method for preparing a metal core for investment casting and a method for investment precision casting of aluminum alloy castings based on the metal core. Background technique [0002] With the development of precision equipment such as radar, some precision functional components are developing in the direction of compact structure and high electrical performance. Taking a waveguide as an example, the design of the waveguide includes a slot with a width of 0.8mm, a length of 3.6mm, and a depth of 5.2mm, and the roughness of the surface of the slot and other non-processed surfaces is required to be no greater than 3.2μ. Currently known forming methods include mechanical processing, electric discharge machining and casting to form the waveguide and its gaps. However, since the gap is surrounded by the wall of the waveguide, the machining tool rod cann...

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Problems solved by technology

[0003] In order to solve the problem in the prior art that there are no small gaps and the surface quality of the gaps is high, the present invention provides a method for preparing a metal core for investment casting and a method for investment precision casting of aluminum alloy castings based on the metal core. By preparing a metal core for investment casting, the aluminum alloy castings based on the investment casting precision casting of the metal core meet the requirements of dimensional accuracy and surface roughness

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