A processing method for improving the grain size of the harmonic reducer flex wheel

A harmonic reducer and processing method technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of flexible splines being easily damaged, flexible splines with large alternating loads, etc., and achieve large strong plastic product and small grain size , the effect of high grain size grade

Active Publication Date: 2021-02-05
NINGBO ZHONGDA LEADER TRANSMISSION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above patents have improved the band structure, the grain size of the flexspline can reach 10 grades, but at present the flexspline needs to bear a large alternating load during the deceleration transmission process, and the flexspline is easily damaged during operation
This problem cannot be solved by using the above patents, so it is necessary to develop a processing method that can improve the fatigue strength and service life of the flexible spline

Method used

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  • A processing method for improving the grain size of the harmonic reducer flex wheel
  • A processing method for improving the grain size of the harmonic reducer flex wheel
  • A processing method for improving the grain size of the harmonic reducer flex wheel

Examples

Experimental program
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Effect test

Embodiment 2

[0103] A processing method for increasing the grain size of a harmonic reducer flexwheel, comprising the following steps:

[0104] (1) Cut bar stock. The bar is made of 40CrNiMoA medium carbon low alloy steel.

[0105](2) Heating. Electromagnetic induction heating is adopted, the heating time is 9s, and the heating temperature is 1120°C.

[0106] (3) Upsetting. The upsetting temperature is 1120°C.

[0107] (4) Die forging. The initial forging temperature is 1110°C, the final forging temperature is 880°C, and the wall thickness of the forging is 7.5mm.

[0108] (5) Air cooling. After the die forging is finished, place the workpiece on the mesh belt and cool it quickly with a fan. The air cooling speed, that is, the cooling rate of the workpiece is 25°C / s. When it is cooled to about 500°C, it is placed in the air for free cooling.

[0109] (6) Isothermal normalizing. Heat the workpiece to 880°C for 180 minutes, then place the workpiece in a slow cooling tank for slow coo...

Embodiment 3

[0122] A processing method for increasing the grain size of a harmonic reducer flexwheel, comprising the following steps:

[0123] (1) Cut bar stock. The bar is made of 40CrNiMoA medium carbon low alloy steel.

[0124] (2) Heating. Electromagnetic induction heating is adopted, the heating time is 11s, and the heating temperature is 1150°C.

[0125] (3) Upsetting. The upsetting temperature is 1145°C.

[0126] (4) Die forging. The initial forging temperature is 1130°C, the final forging temperature is 918°C, and the wall thickness of the forging is 7.5mm.

[0127] (5) Air cooling. After die forging, place the workpiece on the mesh belt and cool it quickly with a fan. The air cooling speed, that is, the cooling rate of the workpiece is 30°C / s. After cooling to about 500°C, place it in the air for free cooling.

[0128] (6) Isothermal normalizing. Heat the workpiece to 900°C for 150 minutes, then place the workpiece in a slow cooling tank for slow cooling, and when cooled ...

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Abstract

The present invention relates to the technical field of harmonic reducers, in particular to a processing method for increasing the grain size of a harmonic reducer flexwheel, comprising the following steps: (1) cutting bar material; (2) heating; (3) upsetting Coarse; (4) Die forging; (5) Air cooling; (6) Isothermal normalizing; (7) Rough machining; (8) Secondary normalizing; (9) Quenching and tempering. After die forging and air cooling, the average grain size can reach 26-33μm, that is, the grain size can reach 7-7.5 grade, and the structure will not be over-burned, and forging cracks or banded structures will not occur. After secondary normalizing, the grain size can reach 10‑10.5 grade, after two times of salt bath heating and quenching, after tempering, the grain size can reach 5‑6μm, the grain size can reach 12‑12.5 grade, and the microstructure is tempered. Pyrosorbite and a small amount of troostite, the hardness is 34-38HRC, and the strength-plastic product of mechanical properties can exceed 25000MPa%.

Description

technical field [0001] The invention relates to the technical field of harmonic reducers, in particular to a processing method for increasing the grain size of a flexspline of a harmonic reducer. Background technique [0002] The flex spline is the core component of the harmonic reducer, which determines the service life, transmission accuracy and transmission efficiency of the harmonic reducer. Due to the very high requirements on the mechanical properties of flexsplines, tooth shape design and manufacturing precision, there is still a gap between my country's research and development level and the advanced manufacturing level of Japan, the United States and some countries in the European Union. Therefore, my country's high-quality harmonic deceleration The implementer still relies on imports. In addition to the influence of factors such as tooth shape design, manufacturing accuracy, and surface treatment, the grain size of the flexspline material is a key internal material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14C21D1/25C21D1/28C21D9/34
CPCB23P15/14C21D1/25C21D1/28C21D9/34
Inventor 陈正周罗凯宇黄炳
Owner NINGBO ZHONGDA LEADER TRANSMISSION EQUIP
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