Investment casting thin-walled part casting method

Abstract

An investment casting thin-walled part casting method is disclosed, comprising the following steps of: (1) manufacturing the mould of a wax pattern; (2) manufacturing the wax pattern; (3) welding the wax pattern and a pouring wax rod group to a module; (4) shell making; (5) de-waxing; (6) roasting the shell; (7) pouring; (8) cleaning the shell; (9) heat treatment; (10) removing reinforcing ribs, implementing root polishing and ball blasting; the mould manufacturing of the wax pattern comprises that a mould is provided with two parallel cast cavities between which a plurality of channel holes are arranged; the wax manufacturing comprises that: the wax is injected into the mould of the wax pattern at first and then the wax pattern is de-moulded after being cooled, therefore, the shaped wax pattern is of a catamaran-type structure, and wax-made reinforcing ribs equal to the number of the channels in the step (1) are arranged between the catamaran-type structure. Compared with the prior art, the invention has the characteristics of being difficult of deformation, high rate of finished products and high benefit.

Description

Technical field: [0001] The invention relates to the field of investment casting, in particular to an investment casting thin-wall casting method. Background technique: [0002] Investment casting (also known as precision casting and lost wax casting) is one of the most widely used special casting methods. Its products involve various fields. The annual output of castings at home and abroad is increasing every year, ranking first among special casting methods. [0003] Investment castings are characterized by: [0004] 1. High dimensional accuracy and good surface finish; [0005] 2. Can cast castings of different complexity; [0006] 3. It can cast thin and small castings below 0.5mm and 0.1kg; [0007] 4. Not limited by the type of alloy; [0008] 5. It can be mechanized or semi-non-mechanized mass production and manual small-scale production. [0009] At present, there are many investment casting manufacturers in China, but 80% of the methods in the existing technolo...

AI Technical Summary

Problems solved by technology

[0012] 2. Wax molds, especially thin-walled wax molds, are easily deformed by stress during placement and movement.

[0013] 3. Thin-walled parts are easily deformed during post-processing, especially during heat treatment

[0014] At present, although many medium-temperature or high-temperature mold materials are constantly being introduced on the market, due to the wide variety of products of many enterprises, such as changing wax materials, due to different shrinkage rates of different wax materials, a large number of molds will need to be repaired or cannot be used, and the direct loss will be will be millions of dollars

Therefore, quite a lot of enterprises in the existing technology would rather carry out post-sequence repair, mechanical processing or scrapping of deformed products than easily replace low-temperature wax materials.

Therefore, how to solve the easy deformation of the castings in the low temperature wax water glass production process, reduce the scrap rate and improve the efficiency is a difficult problem faced by many investment casting manufacturers.