CN105734247A - Vacuum quenching process for thread rolling die - Google Patents
Vacuum quenching process for thread rolling die Download PDFInfo
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- CN105734247A CN105734247A CN201410744848.5A CN201410744848A CN105734247A CN 105734247 A CN105734247 A CN 105734247A CN 201410744848 A CN201410744848 A CN 201410744848A CN 105734247 A CN105734247 A CN 105734247A
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Abstract
The invention discloses a vacuum quenching process for a thread rolling die. A Cr12MoV material is adopted. The vacuum quenching process is characterized by comprising the following process steps that 1, preheating is conducted, specifically, the preheat temperature is 800 DEG C-900 DEG C, the heat preservation time is 60-90 min, and the vacuum degree is 130-670 Pa; 2, heating is conducted, specifically, the heating temperature is 1020 DEG C-1040 DEG C, the heat preservation time is 30-45 min, the vacuum degree is 50-70 MPa, and high-purity nitrogen is filled; 3, cooling is conducted, specifically, high-pressure gas quenching is carried out, the vacuum degree is 80-90 MPa, and the tapping temperature of a workpiece is lower than 80 DEG C; and 4, tempering is conducted, specifically, two times of nitrate tempering are conducted, the tempering temperature is 190 DEG C-210 DEG C, and the hardness after tempering is 60-65 HRC. According to the vacuum quenching process for the thread rolling die, after the thread rolling die is processed, the hardness is high, the toughness and the plasticity are good, the tipping defect is overcome, compared with salt bath quenching, the service life of the thread rolling die subjected to vacuum quenching is prolonged by 2-3 times, and economic benefits are good.
Description
Technical field
The invention belongs to Technology for Heating Processing field, specifically the vacuum hardening technique of a kind of cylindrical die roll.
Background technology
Cylindrical die roll is external thread rolling tool.At screw tool and standard component maker, cylindrical die roll is frock crucial in production process and important cutter, the height in its life-span and the quality of quality directly influence the precision of the workpiece such as the screw tap, the standard component that process, manufacturing schedule are brought material impact simultaneously.Therefore, the crudy of cylindrical die roll seems particularly critical.Cylindrical die roll was lost efficacy and carried out statistical analysis it can be seen that heat treatment is undoubtedly topmost influence factor.Prior art is generally adopted Cr12MoV steel cylindrical die roll, and result of use is less than satisfactory, and its failure mode is often tipping.
Summary of the invention
It is an object of the invention to for Shortcomings part in above-mentioned technology, the present invention provides the vacuum hardening technique of a kind of cylindrical die roll, and hardness is higher, has good toughness and plasticity, reduces tipping defect, improves service life.
The technical scheme realizing the object of the invention is as follows:
The vacuum hardening technique of a kind of cylindrical die roll, adopts Cr12MoV material, is characterised by, comprises the following steps that:
(1) preheating: preheat temperature 800-900 DEG C, temperature retention time 60-90min, vacuum 130-670Pa；
(2) heating: 1020-1040 DEG C, temperature retention time 30-45min；Vacuum 50-70MPa, fills high pure nitrogen；
(3) cooling: high pressure gas quenching, vacuum 80-90MPa, workpiece tapping temperature is less than 80 DEG C；
(4) tempering: perform twice at salt made from earth containing a comparatively high percentage of sodium chloride tempering, temperature 190-210 DEG C, temper number 60-65HRC.
The present invention provides the vacuum hardening technique of a kind of cylindrical die roll, and after it processes, hardness is high, has good toughness and plasticity, reduces tipping defect, improves 2-3 times with vacuum hardening than with the salt bath quenching life-span, good in economic efficiency.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
The vacuum hardening technique of a kind of cylindrical die roll, adopts Cr12MoV material, comprises the following steps that:
(1) preheating: preheat temperature 800-900 DEG C, temperature retention time 60-90min, vacuum 130-670Pa；
(2) heating: 1020-1040 DEG C, temperature retention time 30-45min；Vacuum 50-70MPa, fills high pure nitrogen；
(3) cooling: high pressure gas quenching, vacuum 80-90MPa, workpiece tapping temperature is less than 80 DEG C；
(4) tempering: perform twice at salt made from earth containing a comparatively high percentage of sodium chloride tempering, temperature 190-210 DEG C, temper number 60-65HRC.
The present invention provides the vacuum hardening technique of a kind of cylindrical die roll, and after it processes, hardness is high, has good toughness and plasticity, reduces tipping defect, improves 2-3 times with vacuum hardening than with the salt bath quenching life-span, good in economic efficiency.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.All technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (1)
1. a vacuum hardening technique for cylindrical die roll, adopts Cr12MoV material, is characterised by, comprises the following steps that:
(1) preheating: preheat temperature 800-900 DEG C, temperature retention time 60-90min, vacuum 130-670Pa；
(2) heating: 1020-1040 DEG C, temperature retention time 30-45min；Vacuum 50-70MPa, fills high pure nitrogen；
(3) cooling: high pressure gas quenching, vacuum 80-90MPa, workpiece tapping temperature is less than 80 DEG C；
(4) tempering: perform twice at salt made from earth containing a comparatively high percentage of sodium chloride tempering, temperature 190-210 DEG C, temper number 60-65HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744848.5A CN105734247A (en) | 2014-12-09 | 2014-12-09 | Vacuum quenching process for thread rolling die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744848.5A CN105734247A (en) | 2014-12-09 | 2014-12-09 | Vacuum quenching process for thread rolling die |
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| CN105734247A true CN105734247A (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410744848.5A Pending CN105734247A (en) | 2014-12-09 | 2014-12-09 | Vacuum quenching process for thread rolling die |
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| CN (1) | CN105734247A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107674942A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of high speed steel screw tap screw die vacuum air-quenching |
| CN107674941A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of alloy tool steel bearing steel tap die vacuum oil quenching |
| CN107815521A (en) * | 2017-11-28 | 2018-03-20 | 湖北工程职业学院 | A kind of heat treatment quenching process of high-carbon chrome molybdenum bubbing steel precision component |
| CN109338060A (en) * | 2018-12-11 | 2019-02-15 | 重庆世潮机械有限公司 | A kind of cylindrical die roll process for preparing raw material |
| CN109385506A (en) * | 2018-12-11 | 2019-02-26 | 重庆世潮机械有限公司 | A kind of cylindrical die roll quenching technical |
-
2014
- 2014-12-09 CN CN201410744848.5A patent/CN105734247A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107674942A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of high speed steel screw tap screw die vacuum air-quenching |
| CN107674941A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of alloy tool steel bearing steel tap die vacuum oil quenching |
| CN107815521A (en) * | 2017-11-28 | 2018-03-20 | 湖北工程职业学院 | A kind of heat treatment quenching process of high-carbon chrome molybdenum bubbing steel precision component |
| CN109338060A (en) * | 2018-12-11 | 2019-02-15 | 重庆世潮机械有限公司 | A kind of cylindrical die roll process for preparing raw material |
| CN109385506A (en) * | 2018-12-11 | 2019-02-26 | 重庆世潮机械有限公司 | A kind of cylindrical die roll quenching technical |
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Application publication date: 20160706 |
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| WD01 | Invention patent application deemed withdrawn after publication |