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A method of using pressed borax in copper-steel bimetal casting process

A bimetallic and borax technology, which is applied in the field of bimetallic composite molding, can solve problems such as shrinkage and shrinkage, and achieve the effects of volume reduction, good fluidity, and increased solubility

Active Publication Date: 2022-04-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, common casting defects such as shrinkage porosity and shrinkage cavity are also faced after casting

Method used

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  • A method of using pressed borax in copper-steel bimetal casting process
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  • A method of using pressed borax in copper-steel bimetal casting process

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Embodiment 1

[0023] A method for using pressed borax in a copper-steel bimetal casting process, comprising the steps of:

[0024] Step 1. Add borax into the graphite crucible, install the graphite crucible on the induction heating furnace, and keep it warm at 400°C for 30 minutes to remove crystal water; then ball mill the borax until the particle size is 100-200 mesh.

[0025] Step 2, uniformly mixing the borax treated in step 1 with potassium fluoride and sodium carbonate to obtain a mixed powder. In the mixed powder, the mass percentage of potassium fluoride accounts for 5%, the mass percentage of sodium carbonate accounts for 5%, and the balance is borax;

[0026] The obtained mixed powder is pressed, the pressing pressure is 50MPa, the holding time is 5min, the pressed borax quality is 9.14g, and the density is 56% borax block is obtained.

[0027] Step 3, utilize absolute ethanol to clean the steel substrate (the groove diameter of 45# steel is 46mm, the thickness of the molten laye...

Embodiment 2

[0031] A method for using pressed borax in a copper-steel bimetal casting process, comprising the steps of:

[0032] Step 1. Add borax into the graphite crucible, install the graphite crucible on the induction heating furnace, and keep it warm at 400°C for 30 minutes to remove crystal water; then ball mill the borax until the particle size is 100-200 mesh.

[0033] Step 2, uniformly mixing the borax treated in step 1 with potassium fluoride and sodium carbonate to obtain a mixed powder. In the mixed powder, the mass percentage of potassium fluoride accounts for 5%, the mass percentage of sodium carbonate accounts for 5%, and the balance is borax;

[0034] The obtained mixed powder is pressed, the pressing pressure is 40MPa, the holding time is 5min, the pressed borax quality is 6.85g, and the density is 48% borax block is obtained.

[0035] Step 3. Utilize absolute ethanol to clean the steel substrate (45# steel groove diameter 46mm, the thickness of the molten layer of 6.85g...

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Abstract

The invention discloses a method for using pressed borax in a copper-steel double-metal casting process. After the borax is subjected to dehydration treatment and particle refinement, it is mixed with potassium fluoride and sodium carbonate and pressed into a borax block, and then the borax block is Used in copper-steel bimetal casting process. In the method of the invention, the borax can play the role of deoxidation, anti-oxidation, heat preservation and structural sequential solidification conditions, and the volume of the borax is reduced by pressing the borax, and its dependence on the size of the steel matrix is ​​reduced.

Description

technical field [0001] The invention belongs to the field of bimetal composite molding, and in particular relates to a method for using pressed borax in a copper-steel bimetal casting process. Background technique [0002] Due to the excellent tribological properties of copper alloys and the advantages of steel in mechanics and machining properties, copper-steel bimetals are widely used in various mechanical parts, especially in shaft sleeves, bushings, and key parts of plunger pumps. There are key applications in components, large and medium-sized stamping die guide parts, etc. There are many forming methods of copper-steel bimetal, and the methods widely used in production are: rolling composite method, powder sintering method, casting composite method, electromagnetic continuous casting method, melting casting method, etc. Rolling composite method and powder sintering method generally have the limitation of low bonding strength, which makes it difficult to operate stably...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/06B22D19/16
CPCB22D23/06B22D19/16
Inventor 尹延国刘凌峰吴玉程曹刚李蓉蓉张钰辉刘聪
Owner HEFEI UNIV OF TECH