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Manufacturing method of electric vehicle motor rotor

A processing method and technology for motor rotors, which are applied in electric vehicles, motors, manufacturing stator/rotor bodies, etc., can solve the problems of cumbersome and high processing costs, and achieve the effects of low yield, good hardness and good wear resistance.

Inactive Publication Date: 2015-09-30
CHONGQING TONGSAI ELECTROMECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processing methods are generally cumbersome and costly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A processing method for an electric vehicle motor rotor, comprising the following steps:

[0032] (1) The powder metallurgy components are prepared according to the following weight ratio: 4.5% Cu, 0.15% C, 0.1% MnS, 0.02% Fe 2 o 3 , 1% ZrO 2 The remainder is Fe and unavoidable impurities;

[0033] (2) Mix powder metallurgy components, dry press molding in a mold, molding pressure 50MPa, holding time 20min;

[0034] (3) Isostatic pressing, molding pressure 220MPa, holding time 10min;

[0035] (4) Sintering, the sintering temperature is 1150°C, and the sintering speed is 95mm / min;

[0036] (5) Shaping, shaping pressure 100T;

[0037] (6) Fine grinding and modifying the surface to obtain finished products.

[0038] The main technical parameters of product testing: Density: 6.24g / cm 3 ; Hardness: HRB 68; surface roughness value Ra0.06μm.

Embodiment 2

[0040] A processing method for an electric vehicle motor rotor, comprising the following steps:

[0041] (1) The powder metallurgy components are prepared according to the following weight ratio: 4% Cu, 0.2% C, 0.03% MnS, 0.002% Fe 2 o 3 , 1.2% ZrO 2 The remainder is Fe and unavoidable impurities;

[0042] (2) Mix powder metallurgy components, dry press molding in a mold, molding pressure 100MPa, holding time 15min;

[0043] (3) Isostatic pressing, molding pressure 250MPa, holding time 12min;

[0044] (4) Sintering, the sintering temperature is 1180°C, and the sintering speed is 90mm / min;

[0045] (5) Shaping, shaping pressure 120T;

[0046] (6) Fine grinding and modifying the surface to obtain finished products.

[0047] The main technical parameters of product testing: Density: 6.30g / cm 3 ; Hardness: HRB 70; Surface roughness value Ra0.08μm.

Embodiment 3

[0049] A processing method for an electric vehicle motor rotor, comprising the following steps:

[0050] (1) The powder metallurgy components are prepared according to the following weight ratio: 4.3% Cu, 0.22% C, 0.08% MnS, 0.01% Fe 2 o 3 , 1.5% ZrO 2 The remainder is Fe and unavoidable impurities;

[0051] (2) Mix powder metallurgy components, dry press molding in a mold, molding pressure 60MPa, holding time 20min;

[0052] (3) Isostatic pressing, molding pressure 220MPa, holding time 11min;

[0053] (4) Sintering, the sintering temperature is 1170°C, and the sintering speed is 90mm / min;

[0054] (5) Shaping, shaping pressure 120T;

[0055] (6) Fine grinding and modifying the surface to obtain a finished product.

[0056] The main technical parameters of product testing: Density: 6.26g / cm 3 ; Hardness: HRB 66; Surface roughness value Ra0.06μm.

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Abstract

The invention relates to an electric vehicle motor rotor and a machining method of the electric vehicle motor rotor. The electric vehicle motor rotor and the machining method aim to simplify the machining process and improve machining efficiency. A rotor body of the vehicle motor rotor is machined and formed through powder metallurgy. The powder metallurgy components are as follows: by weight, 4.0-4.5% of Cu, 0.15-0.25% of C, 0.025-0.1% of MnS, 0.002-0.02% of Fe2O3, 1-1.5% of ZrO2 and the balance Fe and impurities. The components are dry-pressed and formed in a die after being mixed, then subjected to isostatic pressing, sintered, shaped and precisely ground into finished products. Compared with the prior art, the electric vehicle motor rotor is high in precision, low in weight, good in hardness, good in wear resistance, enduring and durable. The density of the rotor is 6.1-6.5g / cm<3>. The hardness of the rotor ranges from HRB 63 to HRB 70. The roughness value of the surface ranges from Ra 0.08 micron to Ra 0.02 micron.

Description

technical field [0001] The invention relates to an electric automobile component, in particular to a processing method for an electric automobile motor rotor. Background technique [0002] Electric vehicles (BEV), commonly known as new energy vehicles, refer to vehicles powered by on-board power supplies and driven by motors. Because it has less impact on the environment than traditional cars, its prospects are widely optimistic, and it is one of the effective ways to solve the pollution of automobile exhaust emissions. [0003] The rotor of an electric vehicle motor, the rotating part in the motor, is roughly shaft-shaped. However, because it needs to match the service life of the vehicle, and the vehicle is usually at least 1 ton after being fully loaded, the operating load is relatively heavy. Therefore, the requirements for the machining accuracy, performance and service life of the motor rotor are very high. In the prior art, some manufacturers themselves have master...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F3/16C22C38/16H02K15/02
CPCY02T10/64
Inventor 傅强陈明菊
Owner CHONGQING TONGSAI ELECTROMECHANICAL