Treatment process for shortening planetary extruder screw length
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A processing technology, machine screw technology, applied in the field of processing technology to shorten the length of the planetary extruder screw
Active Publication Date: 2013-01-23
北京华腾佳和科技有限公司
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Abstract
Description
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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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Effect test
Embodiment 1
[0020] 3) Cooling: After the workpiece is moved from the furnace to the furnace, it naturally cools naturally at room temperature.
[0021] 4), step 3) After the end, return to step 2), repeat twice to five times.
[0022] Example 2:
[0023] A processing process that shortens the screw length of the planet extrusion machine, including the following steps:
[0024] 1) Quick cooling: When vacuum quenching, heat the workpiece to 1000 ° C to 1050 ° C, and then cool it with low temperature ammonia gas to reduce the temperature to or lower than 470 ° C;
Embodiment 2
[0026] 3) Cooling: After the workpiece is moved from the furnace to the furnace, it naturally cools naturally at room temperature.
[0027] 4) Step 3) After the end, return to step 2 again), repeat twice to five times.
[0028] Example 3:
[0029] A processing process that shortens the screw length of the planet extrusion machine, including the following steps:
[0030] 1) Quick cooling: When vacuum quenching, heated the workpiece to 1000 ° C. After the heat preservation for a period of time, then use low temperature ammonia gas to quickly cool it, reduce the temperature to or lower than 470 ° C;
Embodiment 3
[0032] 3) Cooling: After the workpiece is moved from the furnace to the furnace, it naturally cools naturally at room temperature.
[0033] 4) Step 3) After the end, return to step 2 again), repeat twice to five times.
[0034] Example 4:
[0035] A processing process that shortens the screw length of the planet extrusion machine, including the following steps:
[0036] 1) Quick cooling: When vacuum quenching, heated the workpiece to 1020 ° C. After the heat preservation for a period of time, then use low temperature ammonia gas to quickly cool it to reduce the temperature to or lower than 470 ° C;
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PUM
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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 involves a processing process that shortens the screw length, especially a processing process that shortens the screw length of the planet extrusion machine. Background technique [0002] When processing the planet screw, the processed workpiece is processed with vacuum quenching. The purpose of vacuum quenching is to greatly improve the hardness of the workpiece and more abrasion.However, after the vacuum quenching process is completed, the screw will become longer, so that the guide course of the screw can not be assembled normally with the plasticization section of the planet.The extension of the screw axial direction is caused by more remnants of the mimselin in the gold phase tissue after the vacuum quenching, and the grains are thick.There is no effective way to deal with the existing technologies, and it can no longer meet people's requirements. Invention content [0003] The purpose of the present invention is to provide the thermal...
Claims
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Application Information
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