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A method for preparing cu-cr-mg-zr-ce high-performance end rings by hot isostatic pressing near net forming

A technology of hot isostatic pressing and near-net forming, which is applied in the field of copper alloy materials for motor rotors, can solve problems such as increased processing costs, low material utilization, and many internal defects, and achieves improved material utilization, saving forging costs, and internal The effect of defect reduction

Active Publication Date: 2021-04-16
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The end ring is a large-scale ring, and the conventional process of the end ring is casting, but the rejection rate of this process is high and there are many internal defects
In recent years, the preparation process of end rings is forging, but the problem faced by this process is that the material utilization rate is low, and the cost is relatively high, and under the call of the country for energy conservation and environmental protection, forging and other thermal processing processes are unfavorable to the environment. Makes the related processing costs more and more increasing trend

Method used

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  • A method for preparing cu-cr-mg-zr-ce high-performance end rings by hot isostatic pressing near net forming
  • A method for preparing cu-cr-mg-zr-ce high-performance end rings by hot isostatic pressing near net forming
  • A method for preparing cu-cr-mg-zr-ce high-performance end rings by hot isostatic pressing near net forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Put the pre-prepared Cu-0.56Cr-0.03Mg-0.24Zr alloy powder into the package whose base material is Q235 for degassing packaging. The degassing process is: vacuumize to 10 -5 Pa level, reheat to 400°C, keep warm for 6h; put the packaged package into the furnace cavity of hot isostatic pressing, use Ar as the gas pressure transmission medium for HIP sintering, the HIP process is: the pressure is 100MPa, the holding time is 0.5h, and the sintering temperature is 900°C. After removing the sheath from the dense copper alloy sintered by HIP, the mechanical and electrical properties of the alloy are adjusted by aging heat treatment at 380°C for 4 hours, and finally the Cu-Cr-Mg-Zr alloy of Φ400×Φ300×40 is obtained by machining End ring products.

Embodiment 2

[0043] Put the pre-prepared Cu-0.82Cr-0.36Zr-0.04Ce alloy powder into the package whose base material is Q235 for degassing packaging. The degassing process is: vacuumize to 10 -5 Pa level, reheat to 500°C, keep warm for 7 hours; put the packaged package into the furnace cavity of hot isostatic pressing, use Ar as the gas pressure transmission medium for HIP sintering, the HIP process is: the pressure is 110MPa, the holding time is 2h, and the sintering temperature is 950°C. After the dense copper alloy sintered by HIP is removed, the mechanical and electrical properties of the alloy are adjusted through heat treatment, and finally the Cu-Cr-Zr-Ce alloy end ring product of Φ400×Φ300×40 is obtained through proper machining .

Embodiment 3

[0045] Put the pre-prepared Cu-0.74Cr-0.03Mg-0.38Zr-0.03Ce alloy powder into the package whose base material is Q235 for degassing packaging. The degassing process is: vacuumize to 10 -5Pa level, reheat to 600°C, keep warm for 6 hours; put the packaged package into the furnace cavity of hot isostatic pressing, use Ar as the gas pressure transmission medium for HIP sintering, the HIP process is: the pressure is 120MPa, the holding time is 2h, and the sintering temperature is 1000°C. After the dense Cu-Cr-Mg-Zr-Ce alloy sintered by HIP is removed from the jacket, the mechanical and electrical properties of the alloy are adjusted through heat treatment, and finally Cu-Cr of Φ400×Φ300×40 is obtained through appropriate machining -Mg-Zr-Ce alloy end ring products.

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Abstract

The invention discloses a method for preparing Cu-Cr-Mg-Zr-Ce high-performance end rings by using hot isostatic pressing near-net forming. The weight percentage composition of the copper alloy is: Cr: 0.3wt%-3.0wt%, Mg: 0.03wt%-1.3wt%, Zr: 0.03wt%-1.0wt%, Ce: 0.01wt%-1.0wt%, Cu: balance. The preparation process of the copper alloy is as follows: ingredient mixing-making sheathing mold-charging-degassing-sealing-HIP-removing sheathing-heat treatment-partial finishing-finished end ring. The present invention utilizes the hot isostatic pressing process to prepare Cu-Cr-Mg-Zr-Ce high-performance finished end rings, which greatly improves the material utilization rate of the end ring products, and at the same time uses the hot isostatic pressing rapid heating method to refine the crystal The particles greatly improve the mechanical properties of the copper alloy.

Description

technical field [0001] The invention relates to the technical field of copper alloy materials for motor rotors, in particular to a method for preparing Cu-Cr-Mg-Zr-Ce high-performance end rings by using hot isostatic pressing near net forming. Background technique [0002] The rotor of a high-power asynchronous traction motor for rail transit is a key component of the motor. At present, high-speed traction motors for rail transit adopt a squirrel-cage structure, and the end ring is one of the key components of the rotor. The rotor is subjected to various stresses and temperature rise in the motor during operation. The stress acting on the rotor mainly includes electromagnetic stress, residual stress, thermal stress, mechanical stress and environmental stress. The temperature rise of the motor will cause the rotor to deform or break, so the rotor material is required not only to have better normal temperature mechanical properties but also to have certain high temperature me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/04B22F3/15B22F3/24
CPCB22F3/15B22F3/24B22F2003/248C22C1/0425C22C9/00
Inventor 马明月庾高峰张航吴斌李小阳王聪利张琦靖林
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD