Method for investment casting of chromium bronze casting in vacuum environment

Abstract

The embodiment of the invention discloses a method for investment casting of a chromium bronze casting in a vacuum environment. The method comprises the following steps: under the vacuum environment condition, preparing electrolytic copper and a copper-chromium intermediate alloy according to a certain proportion, then filling into a graphite crucible, heating by using a graphite resistance heating mode, and after copper and chromium are fully molten, through a mechanical casting system in a furnace, pouring molten chromium bronze into a fired mold, and after cooling, removing a mold shell to obtain a casting. The defects that in existing chromium bronze casting, the casting quality is poor, the mechanical performance is poor, the conductivity is poor, and casting loss is serious can be obviously overcome or overcome; the problems that a chromium element is extremely prone to oxidization in the atmosphere, the molten chromium bronze is poor in flowability, large in viscosity, prone to bonding, large in chromium loss and the like are effectively solved, and the quality of the chromium bronze casting is greatly improved; the investment casting mode is adopted, and the defects that a vacuum furnace is small in size and few in parts are effectively overcome; and the pouring problem is effectively solved in a closed container by adopting a mechanical transmission mode.

Description

[0001] This application is a divisional application with an application date of February 4, 2015, an application number of 201510057494.1, and an invention title of "A Method for Investment Casting Chromium Bronze Castings in a Vacuum Environment". The applicant is Henan Kefeng New Material Co., Ltd. technical field [0002] The invention relates to the field of bronze castings, in particular to a method for investment casting chrome bronze castings in a vacuum environment. Background technique [0003] At present, chrome bronze castings are usually cast in an atmospheric environment, and its products have the following disadvantages: [0004] 1. The casting defect is serious and the yield is low. Due to the poor fluidity of the chromium bronze melt in the atmospheric environment, many unavoidable defects such as pores, shrinkage cavities, porosity, and slag inclusions appear in the castings. [0005] 2. The casting loss is serious and the casting cost is high. Due to the ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the embodiments of the present invention is to provide an effective solution to the problems of chromium element being easily oxidized in the atmosphere, poor fluidity of chromium bronze melt, high viscosity, easy bonding and large loss of chromium, etc. It improves the quality of chrome bronze castings, effectively solves the defect of vacuum furnace with small volume and few parts, and effectively solves the pouring problem. The method of investment casting chrome bronze castings in a vacuum environment