Copper ingot inuse for gravity casting, and casting method

Abstract

This invention relates to a method for preparing copper ingots by gravity casting. The copper ingots comprise basic raw materials and additives. The basic raw materials comprise Cu 59-61 wt.%, Pb 1.1-1.7 wt.%, Al 0.5-0.7 wt.% and Zn. The additives comprise refining agent and thinning agent. The method comprises: (1) preparing the raw materials according to the formula; (2) heating and melting theraw materials; (3) adding the refining agent, stirring uniformly and removing impurities; (4) adding the thinning agent, and stirring uniformly; (5) sampling, examining the fluidity of the copper liquid as well as the proportions of allcomponents, and adding the raw materials or the refining agent if not qualified; (6) casting in copper ingots, and cooling naturally; (7) examining the properties ofthe copper ingots, and grading. The gravity casting method has such advanatages as good fluidity of metal liquid, few defects of cast products, high qualification rate, good polishing property, reduc ed labor and improved productivity.

Description

Technical field [0001] The invention relates to copper ingots, in particular to copper ingots for gravity casting and a casting method thereof. technical background [0002] Gravity casting is a new type of casting production method. It uses automatic equipment such as gravity pouring machines to cast relatively small castings, especially the casting method of relatively precision castings. It has the advantages of low environmental pollution and high production efficiency. The field of application is getting wider and wider. [0003] Gravity casting generally uses metal models and resin sand cores to achieve the production of castings. It has strict requirements on the raw materials for casting, especially for the fluidity of the molten metal after the raw materials are melted. At present, the field of gravity casting is used Brass and red copper are more common, but both have poor fluidity after melting, poor polishing performance of processed finished products, and casting prob...

AI Technical Summary

Problems solved by technology

[0005] 1. Poor fluidity after melting

Poor fluidity is the root cause of many casting defects such as cold shut, and at the same time causes low casting yield, 70% yield is very low for other alloys in the foundry industry

[0006] 2. The casted finished product has poor polishability

The surface of the existing copper alloy casting is rough, and it needs more than ten times of polishing to barely achieve the desired effect, which is labor-intensive and inefficient

[0007] 3. There are many internal defects in casting products

The existing similar copper alloys contain a large amount of impurities in the casting process, and in addition to low surface finish, there will be internal quality defects such as hard spots

Images