Machining method for improving grain size of flexible gear of harmonic reducer

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: 2020-04-14
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 proces...

Method used

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  • Machining method for improving grain size of flexible gear of harmonic reducer
  • Machining method for improving grain size of flexible gear of harmonic reducer
  • Machining method for improving grain size of flexible gear of harmonic reducer

Examples

Experimental program
Comparison scheme
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 invention relates to the technical field of harmonic reducers, in particular to a machining method for improving the grain size of a flexible gear of a harmonic reducer. The machining method comprises the following steps of (1) bar cutting; (2) heating; (3) upsetting; (4)die forging; (5) air cooling; (6) isothermal normalizing; (7) rough machining; (8) secondary normalizing; and (9) quenchingand tempering treatment. The average grain size of the flexible gear subjected to die forging and air cooling can reach up to 26-33 microns, that is, the granularity can reach the level 7-7.5. Moreover, overburning cannot occur to the structure of the flexible gear, and forging cracks or banded structures cannot be generated. After secondary normalizing, the granularity can reach the level 10-10.5. After two-time salt bath heating and quenching and tempering, the grain size reaches up to 5-6 microns, and the granularity reaches the level 12-12.5. The microstructures belong to tempered sorbiteand a little troostite. The hardness is 34-38 HRC. The product of strength and elongation of the mechanical performance can exceed 25000 MPa%.

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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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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