Manufacturing method of new-energy automobile drive motor shaft

Abstract

The invention discloses a manufacturing method of a new-energy automobile drive motor shaft. A blank is heated at a temperature of 1050 DEG C to 1150 DEG C, die forging and forming are conducted on the blank on an electric screw press, and a pre-forging blank is obtained; a ball normalizing method is adopted; phosphorizing and saponifying are conducted; an inner spline is manufactured through cold extruding; machining and thermal processing are conducted, and a motor shaft meeting technological requirements is obtained. Tooth-shaped backward-extrusion forming is adopted in the key spline cold extruding procedure, and a backward-extrusion process replaces a traditional tooth insertion process; due to the metal plastic forming process, a metal assembly line is complete and is not cut off, and product strength is high; meanwhile, due to the fact that a tooth-shaped extrusion male die is integrally machined, imported high-precision line cutting and electric discharge machining devices are adopted for machining, it is ensured that the tooth shape accuracy of the male die is smaller than or equal to the fifth-stage spline accuracy (GB3478.1-2008), and the Fr value and the FP value are greatly optimized. Thus, the extruded inner spline accuracy can reach the sixth-stage spline accuracy, and the tooth shape accuracy is much better than that of the tooth insertion process.

Description

technical field [0001] The invention belongs to the field of metal parts processing, and relates to a method for manufacturing a drive motor shaft of a new energy vehicle. Background technique [0002] The development of new energy vehicles is the strategic direction of the country. my country's new energy vehicles include: pure electric vehicles and plug-in hybrid vehicles. The drive motor is the core part of the new energy vehicle. The motor shaft is the key component of the entire drive motor, which plays the role of fixing the rotor core and transmitting power. Its performance directly affects the performance of the power system of the new energy vehicle. The drive motor shaft connection end is the output end of the motor. After the drive motor generates power, it is connected with the automatic transmission or deceleration mechanism of the automobile through the internal spline of the end. The internal splines of this part have been manufactured by pure machining bef...

AI Technical Summary

Problems solved by technology

The internal splines of this part have been manufactured by pure machining before, and there are the following problems: ①The internal splines are processed by gear shaping machine tools with poor tooth profile accuracy

② Due to the cutting process, the metal flow line is cut off, and the service life of the tooth profile is only 20,000 kilometers.

③The processing efficiency is low, and the shift output is only 200 pieces / shift

④ low utilization rate of materials

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