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Special temperature-control cooling thermal treatment technology

A temperature-controlled cooling and process technology, applied in the field of heat treatment process, can solve the problems of increasing production cost, affecting the hardness of high-frequency quenching, and scrapping workpieces

Active Publication Date: 2014-04-02
JIANGSU SUNWAY PRECISION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Moreover, the annealing process after warm forging and the turnover of intermediate logistics from forging to annealing greatly increase the production cost, and there is also the risk of decarburization of the workpiece caused by annealing. After the decarburization of the workpiece, the hardness of medium and high frequency quenching will be seriously affected. All workpieces are scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Place the flange shaft-XC45 warm-forged blank in a continuous mesh belt temperature-controlled furnace, and change the structure in a constant temperature environment by controlling the temperature in the furnace. The heating zone of the temperature control furnace is divided into four zones, the temperature of the first zone and the second zone is 630-680°C, the temperature of the third zone is 590-630°C, the temperature of the fourth zone is not more than 560°C, and the speed of the variable frequency motor of the mesh belt is 10±4Hz---that is, the time for the workpiece to pass through the entire belt is 75-90min. Enter the slow cooling zone until it is released at 500°C.

[0019] The hardness of the temperature-controlled forging blank is 196-211HB, and the hardness dispersion of a single piece is less than 10HB, and the hardness dispersion of the batch is less than 15HB. The metallographic structure is uniform, and the structure is fine pearlite and a small amount ...

Embodiment 2

[0021] Put the universal joint-CF53 warm-forged blank in a continuous mesh belt temperature-controlled furnace, and change the structure in a constant temperature environment by controlling the temperature in the furnace. The heating zone of the temperature control furnace is divided into four zones, the temperature of the first zone and the second zone is 630-680°C, the temperature of the third zone is 590-630°C, the temperature of the fourth zone is not more than 560°C, and the speed of the variable frequency motor of the mesh belt is 10±4Hz---that is, the time for the workpiece to pass through the entire belt is 75-90min. Enter the slow cooling zone until it is released at 500°C.

[0022] The hardness of the temperature-controlled forging blank is 208-225HB, and the hardness dispersion of a single piece is less than 10HB, and the hardness dispersion of the batch is less than 17HB. The metallographic structure is uniform, and the structure is fine pearlite and a small amount...

Embodiment 3

[0024] Put the flange shaft-XC45 warm-forged blank in a continuous mesh belt temperature-controlled furnace. By controlling the temperature in the furnace, the structure is transformed in a constant temperature environment. The temperature in the first and second zones of the temperature-controlled furnace is 640- 650°C, the temperature in the third zone is 600-620°C, the temperature in the fourth zone is not more than 550°C, the speed of the variable frequency motor of the mesh belt is 10±4Hz, the time for the workpiece to pass through the entire mesh belt is 80-90min, and enter the slow cooling zone Until it comes out of the furnace at 480°C, the hardness of the temperature-controlled forging blank is 196-211HB, and the hardness dispersion of a single piece is less than 10HB, and the hardness dispersion of the batch is less than 15HB. The metallographic structure is uniform, and the structure is fine pearlite and a small amount. Punctate fine spheroids, small massive ferrite ...

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Abstract

The invention discloses a special temperature-control cooling thermal treatment technology which is characterized by comprising the following steps of: placing a blank workpiece to be processed after warm forging in a continuous mesh-belt temperature control furnace; and controlling the temperature in the furnace so as to transform the structure in a constant-temperature environment, wherein a heating area of the continuous mesh-belt temperature control furnace is divided into four areas, the temperature of the first and second areas is 630-660 DEG C, the temperature of the third area is 590-630 DEG C, and the temperature of the fourth area is not higher than 560 DEG C; the time of the workpiece passing through the whole mesh belt is 75-90 minutes; and the workpiece enters a slow-cooling area and is discharged when the temperature is lower than 500 DEG C. The technology is relatively simple, the requirements on equipment are low, the production efficiency is high, the production period is short, and the cost is low.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a process related to temperature-controlled cooling. Background technique [0002] At present, in the prior art, after the blank is processed by the warm forging process, in order to smooth the subsequent cold finish forming and spline twisting, the blank after warm forging must be annealed to soften the material and reduce the deformation resistance. Reduce the hardness dispersion of the workpiece to control the technical parameters of the twisted spline. And it is not conducive to the subsequent medium and high frequency quenching process. [0003] After the logistics turnover, and then enter the next process. [0004] Moreover, the annealing process after warm forging and the turnover of intermediate logistics from forging to annealing greatly increase the production cost, and there is also the risk of decarburization of the workpiece caused by annealing. After the decarburization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/84C21D8/00B21J1/06
Inventor 袁兆峰龚爱军徐祥龙施卫兵胡成亮
Owner JIANGSU SUNWAY PRECISION FORGING
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