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Treatment process for shortening planetary extruder screw length

A processing technology and screw technology, which is applied in the processing technology field of shortening the length of the screw of the planetary extractor

Active Publication Date: 2012-01-11
北京华腾佳和科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no effective method to deal with it in the prior art, which can no longer meet people's requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A treatment process for shortening the screw length of a planetary extruder, comprising the steps of:

[0018] 1) Rapid cooling: During vacuum quenching, the workpiece is heated to 1000°C to 1050°C, and after a period of heat preservation, it is then rapidly cooled with low-temperature ammonia gas to reduce the temperature to 470°C or lower;

[0019] 2) Tempering: heat the workpiece to be equal to or higher than 485°C, and keep the workpiece at this temperature for not less than 3 hours, and then cool to equal to or lower than 300°C;

[0020] 3) Cooling: Finally, move the workpiece from the furnace to the outside of the furnace, and cool it naturally at room temperature.

[0021] 4), after step 3) is finished, return to step 2), repeat like this two to five times.

Embodiment 2

[0023] A treatment process for shortening the screw length of a planetary extruder, comprising the steps of:

[0024] 1) Rapid cooling: During vacuum quenching, the workpiece is heated to 1000°C to 1050°C, and then cooled with low-temperature ammonia gas to reduce the temperature to 470°C or lower;

[0025] 2) Tempering: heat the workpiece to be equal to or higher than 485°C, and keep the workpiece at this temperature for not less than 3 hours, and then cool to equal to or lower than 300°C;

[0026] 3) Cooling: Finally, move the workpiece from the furnace to the outside of the furnace, and cool it naturally at room temperature.

[0027] 4) After step 3) is finished, return to step 2), and repeat this two to five times.

Embodiment 3

[0029] A treatment process for shortening the screw length of a planetary extruder, comprising the steps of:

[0030] 1) Rapid cooling: During vacuum quenching, heat the workpiece to 1000°C, keep it warm for a period of time, and then rapidly cool it with low-temperature ammonia gas to reduce the temperature to 470°C or lower;

[0031] 2) Tempering: heat the workpiece to be equal to or higher than 485°C, and keep the workpiece at this temperature for not less than 3 hours, and then cool to equal to or lower than 300°C;

[0032] 3) Cooling: Finally, move the workpiece from the furnace to the outside of the furnace, and cool it naturally at room temperature.

[0033] 4) After step 3) is finished, return to step 2), and repeat this two to five times.

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Abstract

The invention discloses a treatment process for shortening planetary extruder screw length. The treatment process comprises the following steps of 1, a rapid cooling step comprising heating a workpiece to a temperature of 1000 to 1050 DEG C during vacuum quenching, carrying out heat preservation for a period of time, and cooling rapidly the heated workpiece by low-temperature ammonia gas to a temperature less than or equal to 470 DEG C, 2, a tempering step comprising heating the workpiece treated by the step 1 to a temperature great than or equal to 485 DEG C, maintaining the reheated workpiece at the temperature for at least 3 hours, and cooling the reheated workpiece to a temperature less than or equal to 300 DEG C, and 3, a cooling step comprising transferring the workpiece treated by the step 2 out from a furnace form the furnace and cooling at room temperature. After a planetary extruder screw is treated by the treatment process, tempered martensite remaining in the planetary extruder screwan during the vacuum quenching is transformed into sorbite and thus crystal particles become small; an extended workpiece contracts to the length before heat treatment; and hardness of the workpiece is not reduced. Therefore, a workpiece which will be scrapped can be assembled normally; wear of a planetary extruder screw is reduced; and a part service life is prolonged.

Description

technical field [0001] The invention relates to a treatment process for shortening the length of the screw rod, in particular to a treatment process for shortening the length of the screw rod of a planetary lifter. Background technique [0002] When processing the planetary screw, the processed workpiece is vacuum quenched. The purpose of vacuum quenching is to greatly improve the hardness of the workpiece and make it more wear-resistant. However, after the vacuum quenching process is completed, the screw will become longer, so that the lead of the screw will change and cannot be normally assembled with the plasticizing section of the planetary extruder. The axial elongation of the screw is due to the existence of more residual martensite and coarse grains in the metallographic structure after vacuum quenching. There is no effective method to deal with it in the prior art, which cannot meet people's requirements. Contents of the invention [0003] The object of the prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/00
Inventor 刘瑞章
Owner 北京华腾佳和科技有限公司
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