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Rare-earth-containing microalloy enhanced copper alloy for motor rotor and preparation method thereof

A technology of motor rotor and mixed rare earth alloy, applied in the field of non-ferrous metal materials, can solve the problems of motor damage, fracture, insufficient mechanical properties of bar materials, etc., and achieve the effect of improving mechanical properties and meeting comprehensive requirements

Inactive Publication Date: 2013-08-14
上海飞驰铜铝材有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a micro-alloy reinforced copper alloy material containing rare earth for squirrel-cage (including double-squirrel-cage and deep-slot) motor rotors, to solve the problem of large-scale motors under high-torque starting conditions. The mechanical properties are not enough to cause fracture, and even cause technical problems of motor damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Ingredients: silicon 0.18%, iron 0.5%, mixed rare earth 0.08%, boron 0.001%, copper balance

[0021] First, put the weighed iron 7.5kg and copper 1488.3kg into the power frequency induction melting furnace, cover with dry distillation charcoal, heat up until the copper melts, when the temperature reaches 1150 ℃ ~ 1160 ℃, add the weighed boron successively. Copper master alloy (containing 5% boron) 0.3kg, mixed rare earth alloy (containing 30.6% mixed rare earth) 3.9kg. When adding, use a graphite guide plate to press the intermediate alloy and the mixed rare earth alloy into the copper liquid whose surface is covered with a charcoal layer, and stir evenly. After the composition analysis and adjustment meet the requirements, let it stand for 5 minutes and then cast it out of the furnace. The casting temperature is 1150℃~1160℃.

Embodiment 2

[0023] Ingredients: silicon 0.27%, iron 0.5%, mixed rare earth 0.12%, boron 0.001%, copper balance

[0024] First, put the weighed iron 7.5kg and copper 1486.3kg into the power frequency induction melting furnace, cover with dry distillation charcoal, heat up to the copper melting, when the temperature reaches 1150 ℃ ~ 1160 ℃, add the weighed boron successively. Copper master alloy (containing 5% boron) 0.3kg, mixed rare earth alloy (containing 30.6% mixed rare earth) 5.9kg. When adding, use a graphite guide plate to press the intermediate alloy and the mixed rare earth alloy into the copper liquid whose surface is covered with a charcoal layer, and stir evenly. After standing for 5 minutes, it is cast out of the furnace, and the casting temperature is 1150°C to 1160°C.

[0025] The comprehensive properties of the above-mentioned materials of Example 1 and Example 2 are: tensile strength of 280-290 N / mm 2 , Elongation 28~30%, Brinell hardness HB83~85, conductivity 58.5~59.6%...

Embodiment 3

[0027] Ingredients: silicon 0.5%, iron 0.6%, mixed rare earth 0.15%, boron 0.002%, copper balance

[0028] First put the weighed iron 9kg and copper 1466kg into the power frequency induction smelting furnace, cover with dry distillation charcoal, heat up until the copper melts, when the temperature reaches 1160 ℃ ~ 1170 ℃, successively add the weighed silicon copper intermediate Alloy (containing 14% silicon) 17.1kg, boron-copper master alloy (containing 5% boron) 0.6kg, mixed rare earth alloy (containing 30.6% mixed rare earth) 7.4kg. When adding, use a graphite guide plate to press the intermediate alloy and the mixed rare earth alloy into the copper liquid whose surface is covered with a charcoal layer, and stir evenly. After standing for 5 minutes, it is cast out of the furnace, and the casting temperature is 1160°C to 1170°C.

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Abstract

The invention provides a rare-earth-containing microalloy enhanced copper alloy for a motor rotor and a preparation method thereof. In the preparation method, pure microalloy enhanced elements silicon, iron, mixed rare earth alloy and boron are added in copper, wherein the content of silicon is 0.18%-2.0% by mass, the content of iron is 0.5%-1.0% by mass, the content of the mixed rare earth alloyis 0.08%-0.36% by mass, the content of boron is 0.001%-0.01% by mass, impurities are trace, and copper is the balance. The preparation method comprises the following steps of: (1) preparing materials; (2) adding Fe and electrolytic copper; (3) fusing; (4) adding a silicon copper alloy and a boron copper alloy, and finally adding the mixed rare earth alloy; and (5) pouring into an ingot blank. Through adding the microalloy enhanced elements such as silicon, iron, mixed rare earth alloy, boron and the like in the copper base body, the comprehensive requirements of the material on mechanical properties and electrical conductivity when in use can be fully met.

Description

technical field [0001] The invention relates to the field of non-ferrous metal materials, in particular to copper alloy materials for making motor rotors, in particular to a rare earth-containing microalloy reinforced copper alloy for rotor bars of large-scale deep-slot or double squirrel-cage asynchronous motors and preparation thereof method. Background technique [0002] The starting performance of large asynchronous motors and high-load motors has always been the focus of motor manufacturers and users. In order to improve the starting performance of such motors, motor rotors with double squirrel cage or deep groove structures are usually used. The characteristic of the double squirrel-cage rotor is that the rotor is designed to have independent short-circuit windings of inner and outer layers (inner cage and outer cage). (also called guide bars) are formed in parallel along the height of the slot. Generally, copper, brass or bronze is used as the guide bar material. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/10C22C9/00C22C1/03
Inventor 郭莉周洪雷
Owner 上海飞驰铜铝材有限公司
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