CN102312058A - Treatment process for shortening planetary extruder screw length - Google Patents
Treatment process for shortening planetary extruder screw length Download PDFInfo
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- CN102312058A CN102312058A CN201110238308A CN201110238308A CN102312058A CN 102312058 A CN102312058 A CN 102312058A CN 201110238308 A CN201110238308 A CN 201110238308A CN 201110238308 A CN201110238308 A CN 201110238308A CN 102312058 A CN102312058 A CN 102312058A
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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
The present invention relates to a kind of treatment process that shortens spiro rod length, relate in particular to a kind of treatment process that planet proposes the machine spiro rod length that shortens.
Background technology
When the processing planetary-screw, the workpiece that processes to be carried out vacuum hardening handle, the purpose of vacuum hardening is that the hardness of workpiece is improved greatly, and is more wear-resisting.But after the vacuum hardening processing finished, screw rod can be elongated, makes the helical pitch of screw rod change and can't normally assemble with the fluxing zone of planetary extruder.The elongation of screw axial is because after vacuum hardening, has in the metallographic structure that more remaining martensite and crystal grain are thick to be caused.Do not have effective means that it is handled in the prior art, can not satisfy people's requirement.
Summary of the invention
The object of the present invention is to provide planet to propose the heat treating method of machine workpiece, the elongated planetary extruder screw rod in back is handled in vacuum hardening shortened, accomplish the normal appts of screw rod and fluxing zone.
The present invention adopts following technical scheme to realize:
A kind of treatment process that shortens the planetary extruder spiro rod length is characterized in that, this treatment process comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to and be equal to or less than 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
Further, in step 1), during vacuum hardening workpiece is heated to 1000 ℃, 1020 ℃ or 1050 ℃.
Further, in step 1), workpiece is cooled off fast, the temperature of workpiece is reduced to 470 ℃ with the low temperature ammonia.
Further, in step 2) in, workpiece is heated to 485 ℃.
Further, in step 2) in, workpiece is heated to 485 ℃, and workpiece was kept 3 hours under this temperature, be cooled to 300 ℃ then.
Further, step 3) is got back to step 2 again after finishing), so repeat twice to five times.
During vacuum hardening workpiece is heated to 1020 °, after insulation for some time, with the low temperature ammonia it is cooled off fast, the tissue overwhelming majority (more than or equal to 95%) of cooling back workpiece all becomes martensite; The crystal grain of martensitic stucture is very big, and hardness is very high, and fragility is very big, can not directly use; Must carry out tempering, martensitic stucture changes tempered sorbite into during tempering, and tempered sorbite crystal grain is littler than the crystal grain of martensitic stucture; Tempered sorbite is a kind of extraordinary tissue, its good toughness, and intensity is high; Hardness is moderate, in order to obtain the higher wear-resisting sorbite of hardness, generally all tempering temperature is controlled at about 470 °; This moment, the tissue that obtains also residually had martensite, and martensite is big than the tempered sorbite volume, Gu the workpiece after vacuum hardening and tempering has extended.After the process of the planetary extruder screw rod art breading of the present invention; The tempered martensite that remains in during vacuum hardening in the screw rod becomes sorbite, and crystal grain has attenuated, and the workpiece of elongation is withdrawn into the length before the thermal treatment; And do not reduce the hardness of workpiece; Face the workpiece of scrapping and just can normally assemble, reduced the wearing and tearing of planetary-screw, prolong the work-ing life of parts.
Embodiment
Through facing the description of embodiment down; To help public understanding the present invention more; But can't be regarded as restriction by the concrete embodiment that the applicant is given to technical scheme of the present invention, any definition to parts or technical characterictic change and/or to one-piece construction do form but not the conversion of essence all should be regarded as the protection domain that technical scheme of the present invention limits.
Embodiment 1:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to and be equal to or less than 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4), after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 2:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, with the low temperature ammonia it is cooled off then, cool the temperature to and be equal to or less than 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 3:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to and be equal to or less than 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 4:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1020 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to and be equal to or less than 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 5:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to and be equal to or less than 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 6:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 7:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to 470 ℃;
2) tempering: workpiece is heated to 485 ℃, and makes workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 8:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to 470 ℃;
2) tempering: workpiece is heated to 485 ℃, and makes workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Embodiment 9:
A kind of treatment process that shortens the planetary extruder spiro rod length comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to 470 ℃;
2) tempering: workpiece is heated to 485 ℃, and makes workpiece under this temperature, keep being no less than 3 hours, be cooled to 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
4) after step 3) finishes, get back to step 2 again), so repeat twice to five times.
Certainly; The present invention can also have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (6)
1. a treatment process that shortens the planetary extruder spiro rod length is characterized in that, this treatment process comprises following steps:
1) cooling fast: during vacuum hardening workpiece is heated to 1000 ℃ to 1050 ℃, after insulation for some time, with the low temperature ammonia it is cooled off fast then, cool the temperature to and be equal to or less than 470 ℃;
2) tempering: workpiece is heated to is equal to or higher than 485 ℃, and make workpiece under this temperature, keep being no less than 3 hours, be cooled to be equal to or less than 300 ℃ then;
3) cooling: after workpiece is moved to outside the stove naturally cooling at room temperature in stove.
2. the treatment process of shortening planetary extruder spiro rod length according to claim 1 is characterized in that, in step 1), during vacuum hardening workpiece is heated to 1000 ℃, 1020 ℃ or 1050 ℃.
3. the treatment process of shortening planetary extruder spiro rod length according to claim 1 is characterized in that, in step 1), with the low temperature ammonia workpiece is cooled off fast, and the temperature of workpiece is reduced to 470 ℃.
4. the treatment process of shortening planetary extruder spiro rod length according to claim 1 is characterized in that, in step 2) in, workpiece is heated to 485 ℃.
5. the treatment process of shortening planetary extruder spiro rod length according to claim 1 is characterized in that, in step 2) in, workpiece is heated to 485 ℃, and workpiece was kept 3 hours under this temperature, be cooled to 300 ℃ then.
6. according to the temper technology of each described planetary extruder screw rod in the claim 1 to 3, it is characterized in that step 3) is got back to step 2 again after finishing), so repeat twice to five times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110238308 CN102312058B (en) | 2011-08-19 | 2011-08-19 | Treatment process for shortening planetary extruder screw length |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110238308 CN102312058B (en) | 2011-08-19 | 2011-08-19 | Treatment process for shortening planetary extruder screw length |
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| CN102312058A true CN102312058A (en) | 2012-01-11 |
| CN102312058B CN102312058B (en) | 2013-01-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042359A (en) * | 2012-09-11 | 2013-04-17 | 昌利锻造有限公司 | Method for forging screw for extruding machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1342791A (en) * | 2001-10-26 | 2002-04-03 | 常州市培星纺织机械制造有限公司 | Technology for manufacturing stainless steel ring of bast spinning frame |
| CN101182757A (en) * | 2007-12-14 | 2008-05-21 | 天津钢管集团股份有限公司 | Sidetracking petroleum case pipe for petroleum natural gas mining industry and production process thereof |
| CN102061370A (en) * | 2011-01-31 | 2011-05-18 | 中国钢研科技集团有限公司 | Production process of rebar for concrete |
-
2011
- 2011-08-19 CN CN 201110238308 patent/CN102312058B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1342791A (en) * | 2001-10-26 | 2002-04-03 | 常州市培星纺织机械制造有限公司 | Technology for manufacturing stainless steel ring of bast spinning frame |
| CN101182757A (en) * | 2007-12-14 | 2008-05-21 | 天津钢管集团股份有限公司 | Sidetracking petroleum case pipe for petroleum natural gas mining industry and production process thereof |
| CN102061370A (en) * | 2011-01-31 | 2011-05-18 | 中国钢研科技集团有限公司 | Production process of rebar for concrete |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042359A (en) * | 2012-09-11 | 2013-04-17 | 昌利锻造有限公司 | Method for forging screw for extruding machine |
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| CN102312058B (en) | 2013-01-23 |
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Inventor after: Liu Duanzhang Inventor before: Liu Ruizhang |
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Free format text: CORRECT: INVENTOR; FROM: LIU RUIZHANG TO: LIU DUANZHANG |
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