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

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 used for rotor guide bars of large-scale deep groove 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 attention 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 an inner and outer two layers (inner cage and outer cage) with independent short-circuit windings; the characteristic of a deep slot rotor is that the rotor slot is designed as a deep and narrow slot, and the rotor conduc...

Examples

Embodiment 1

[0020] Ingredient ratio: 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 it with dry distilled charcoal, heat it to melt the copper, when the temperature reaches 1150℃~1160℃, add the weighed boron respectively. 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 master alloy and the mixed rare earth alloy into the copper liquid covered with a charcoal layer, and stir evenly. After the composition analysis and adjustment reach 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] Ingredient ratio: 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 it with dry distilled charcoal, and heat it to melt the copper. When the temperature reaches 1150℃~1160℃, add the weighed boron respectively. 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 master alloy and the mixed rare earth alloy into the copper liquid 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℃~1160℃.

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

Embodiment 3

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

[0028] First put 9kg of iron and 1466kg of copper weighed into the power frequency induction melting furnace, cover with dry distilled charcoal, and heat to increase the temperature to the melting of copper. When the temperature reaches 1160℃~1170℃, add the weighed silicon copper one after another. 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 master alloy and the mixed rare earth alloy into the copper liquid 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℃~1170℃.

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 used for rotor guide bars of large-scale deep groove 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 attention 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 an inner and outer two layers (inner cage and outer cage) with independent short-circuit windings; the characteristic of a deep slot rotor is that the rotor slot is designed as a deep and narrow slot, and the rotor conduc...

Examples

Embodiment 1

[0020] Ingredient ratio: 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 it with dry distilled charcoal, heat it to melt the copper, when the temperature reaches 1150℃~1160℃, add the weighed boron respectively. 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 master alloy and the mixed rare earth alloy into the copper liquid covered with a charcoal layer, and stir evenly. After the composition analysis and adjustment reach 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] Ingredient ratio: 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 it with dry distilled charcoal, and heat it to melt the copper. When the temperature reaches 1150℃~1160℃, add the weighed boron respectively. 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 master alloy and the mixed rare earth alloy into the copper liquid 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℃~1160℃.

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

Embodiment 3

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

[0028] First put 9kg of iron and 1466kg of copper weighed into the power frequency induction melting furnace, cover with dry distilled charcoal, and heat to increase the temperature to the melting of copper. When the temperature reaches 1160℃~1170℃, add the weighed silicon copper one after another. 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 master alloy and the mixed rare earth alloy into the copper liquid 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℃~1170℃.