CN102260779B - Quenching method for 20CrNiMo material drill bit - Google Patents
Quenching method for 20CrNiMo material drill bit Download PDFInfo
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- CN102260779B CN102260779B CN2011102038264A CN201110203826A CN102260779B CN 102260779 B CN102260779 B CN 102260779B CN 2011102038264 A CN2011102038264 A CN 2011102038264A CN 201110203826 A CN201110203826 A CN 201110203826A CN 102260779 B CN102260779 B CN 102260779B
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Abstract
The invention relates to a quenching method for a 20CrNiMo material drill bit. The method comprises the following: a first quenching step, which comprises the steps of heating up a drill bit workpiece after being carburized, heat preserving, discharging from a furnace and oil cooling, washing with clear water, first tempering, heat preserving for at least three hours, naturally cooling, and discharging from the furnace and air cooling to the room temperature; and a second quenching step, which comprises the steps of second heating up the drill bit, heat preserving, discharging from the furnace and second oil cooling, extracting oil, washing with clear water, second tempering, and discharging from the furnace and air cooling to the room temperature. Due to the adoption of the two-time quenching process and a display of detected data from a test, the hardness of the workpiece of the 20CrNiMo material drill bit is uniformly distributed, the hardness value of the workpiece of the 20CrNiMo material drill bit reaches to Rockwell hardness 58-61, and the metallurgical structure of the workpiece of the 20CrNiMo material drill bit is further refined; moreover, the invention has the advantages of prolonging the service life of the 20CrNiMo material drill bit, increasing economic benefit, reducing replacement times and reducing production cost.
Description
Technical field
The present invention relates to heat treating method, specifically belong to a kind of quenching method of the 20CrNiMo of being used for material drill bit object.
Background technology
At present; The drill bit product of 20CrNiMo material all adopts disposable quenching, and its quenching temperature is 830～850 ℃, and under 830～850 ℃ of conditions, is incubated 2 hours; Carry out low-temperaturetempering after adopting the quenching oil cooling then; Tempering temperature is 150～180 ℃, is incubated 4 hours, come out of the stove then and air cooling to room temperature.The deficiency of its existence: can not eliminate the infiltration layer carbide network fully, the tissue of drill bit heart portion that can not refinement 20CrNiMo material, thus cause the inhomogeneous and problem of lower of hardness after heat treatment; Its durometer level is at HRC45-60, and drill bit is when running up, because its hardness value fluctuation range is big; Bearing arrangement occurs losing efficacy and whole drill bit can't be used; Its life cycle is short, influences working efficiency, increases production cost.
Summary of the invention
The drill bit that the objective of the invention is to solve present 20CrNiMo material adopts the existing deficiency of disposable quenching, and a kind of drill bit even hardness of the 20CrNiMo of making material is provided, and can improve the quenching method that is used for 20CrNiMo material drill bit of its life cycle.
Realize the technical measures of above-mentioned purpose:
A kind of quenching method that is used for 20CrNiMo material drill bit, its step:
Quench for the first time:
1) heat behind the 20CrNiMo material drill bit workpiece carbonization, heating and temperature control is 868～872 ℃;
2) be incubated 1.5～2 hours down at 868～872 ℃;
3) come out of the stove and oil cooling for the first time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 100～200 ℃;
4) clear water of 20CrNiMo material drill bit workpiece with 60～75 ℃ cleaned;
5) carry out the tempering first time, tempering temperature is controlled to be 595～605 ℃;
6) be incubated at least 3 hours down at 595～605 ℃;
7) carry out the nature temperature drop: 20CrNiMo material drill bit workpiece is with process furnace nature temperature drop to 490～510 ℃;
8) come out of the stove and air cooling to room temperature;
Quench for the second time:
9) 20CrNiMo material drill bit workpiece is carried out the heating second time, Heating temperature is 818～822 ℃;
10) be incubated 1.5～2 hours down at 818～822 ℃;
11) come out of the stove and carry out the oil cooling second time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 100～200 ℃;
12) fuel-displaced back clear water with 60～75 ℃ cleans 20CrNiMo material drill bit workpiece;
13) under 150～160 ℃, carry out the tempering second time, tempering time at least 4 hours;
14) come out of the stove and air cooling to room temperature.
The present invention can know that from the data that test detects 20CrNiMo material drill bit workpiece hardness is evenly distributed owing to adopt twice quenching technology; Hardness value reaches HRC 58-61; Its metallographic structure obtains further refinement, thereby has prolonged the work-ing life of 20CrNiMo material drill bit, the corresponding economic benefit that improved; Reduce and change number of times, reduced production cost.
Embodiment
Below in conjunction with specific embodiment the present invention is done further description:
Embodiment 1
A kind of quenching method that is used for 20CrNiMo material drill bit, its step:
Carrying out the first time quenches:
1) heat behind the 20CrNiMo material drill bit workpiece carbonization, heating and temperature control is 868 ℃;
2) be incubated 1.5 hours down at 868 ℃;
3) come out of the stove and oil cooling for the first time, 20CrNiM o material drill bit workpiece surface temperature is cooled to 100～110 ℃;
4) clear water of 20CrNiMo material drill bit workpiece with 60 ℃ cleaned;
5) carry out the tempering first time, tempering temperature is controlled to be 595 ℃;
6) be incubated 3 hours down at 595 ℃;
7) carry out the nature temperature drop: 20CrNiMo material drill bit workpiece is with process furnace nature temperature drop to 490～495 ℃;
8) come out of the stove and air cooling to room temperature;
Carrying out the second time quenches:
9) 20CrNiMo material drill bit workpiece is carried out the heating second time, Heating temperature is 818 ℃;
10) be incubated 1.5～2 hours down at 818 ℃;
11) come out of the stove and carry out the oil cooling second time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 150～160 ℃;
12) fuel-displaced back clear water with 60 ℃ cleans 20CrNiMo material drill bit workpiece;
13) under 150 ℃, carry out the tempering second time, tempering time 4 hours;
14) come out of the stove and air cooling to room temperature.
Embodiment 2
A kind of quenching method that is used for 20CrNiMo material drill bit, its step:
Carrying out the first time quenches:
1) heat behind the 20CrNiMo material drill bit workpiece carbonization, heating and temperature control is 870 ℃;
12) be incubated 1.5 hours down at 870 ℃;
3) come out of the stove and oil cooling for the first time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 150～165 ℃;
4) clear water of 20CrNiMo drill bit workpiece with 70 ℃ cleaned;
5) carry out the tempering first time, tempering temperature is controlled to be 600 ℃;
6) be incubated 3.5 hours down at 600 ℃;
7) carry out the nature temperature drop: 20CrNiMo material drill bit workpiece is with process furnace nature temperature drop to 495～500 ℃;
8) come out of the stove and air cooling to room temperature;
Carrying out the second time quenches:
9) 20CrNiMo material drill bit workpiece is carried out the heating second time, Heating temperature is 820 ℃;
10) be incubated 2 hours down at 820 ℃;
11) come out of the stove and carry out the oil cooling second time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 100～110 ℃;
12) fuel-displaced back clear water with 68 ℃ cleans 20CrNiMo material drill bit workpiece;
13) under 155 ℃, carry out the tempering second time, tempering time is 4.5 hours;
14) come out of the stove and air cooling to room temperature.
Embodiment 3
A kind of quenching method that is used for 20CrNiMo material drill bit, its step:
Carrying out the first time quenches:
1) heat behind the 20CrNiMo material drill bit workpiece carbonization, heating and temperature control is 872 ℃;
2) be incubated 1 hour 45 minutes down at 872 ℃;
3) come out of the stove and oil cooling for the first time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 185～200 ℃;
4) clear water of 20CrNiMo material drill bit workpiece with 75 ℃ cleaned;
5) carry out the tempering first time, tempering temperature is controlled to be 605 ℃;
6) be incubated 4 hours down at 600 ℃;
7) carry out the nature temperature drop: 20CrNiMo material drill bit workpiece is with process furnace nature temperature drop to 505～510 ℃;
8) come out of the stove and air cooling to room temperature;
Carrying out the second time quenches:
9) 20CrNiMo material drill bit workpiece is carried out the heating second time, Heating temperature is 822 ℃;
10) be incubated 1 hour 45 minutes down at 822 ℃;
11) come out of the stove and carry out the oil cooling second time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 190～200 ℃;
12) fuel-displaced back clear water with 75 ℃ cleans 20CrNiMo material drill bit workpiece;
13) under 155 ℃, carry out the tempering second time, tempering time is 4.5 hours;
14) come out of the stove and air cooling to room temperature.
Table 1 is hardness value after detecting and the tabulation of drill bit workpiece surface hardness situation statistics of each embodiment
| Project | Drill bit workpiece surface hardness situation | Drill bit workpiece centre hardness situation | Drill bit workpiece organization factors |
| Embodiment 1 | HRC58-60 | HRC25-35 | F1-4 level K1-4 level M1-3 level |
| Embodiment 2 | HRC59-61 | HRC35-45 | F1-3 level K1-3 level M1-3 level |
| Embodiment 3 | HRC57-59 | HRC30-45 | F1-4 level K1-4 level M1-3 level |
Find out that from the detection of table 1 the present invention makes drill bit workpiece surface hardness fluctuations scope very little, expression drill bit workpiece surface even hardness, drill bit workpiece centre hardness fluctuation good uniformity, the metallographic structure of drill bit workpiece heart portion in order, thereby can improve its life cycle.
Claims (1)
1. quenching method that is used for 20CrNiMo material drill bit, its step:
Quench for the first time:
1) heat behind the 20CrNiMo material drill bit workpiece carbonization, heating and temperature control is 868～872 ℃;
2) be incubated 1.5～2 hours down at 868～872 ℃;
3) come out of the stove and oil cooling for the first time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 100～200 ℃;
4) clear water of 20CrNiMo material drill bit workpiece with 60～75 ℃ cleaned;
5) carry out the tempering first time, tempering temperature is controlled to be 595～605 ℃;
6) be incubated at least 3 hours down at 595～605 ℃;
7) carry out the nature temperature drop: 20CrNiMo material drill bit workpiece is with process furnace nature temperature drop to 490～510 ℃;
8) come out of the stove and air cooling to room temperature;
Quench for the second time:
9) 20CrNiMo material drill bit workpiece is carried out the heating second time, Heating temperature is 818～822 ℃;
10) be incubated 1.5～2 hours down at 818～822 ℃;
11) come out of the stove and carry out the oil cooling second time, 20CrNiMo material drill bit workpiece surface temperature is cooled to 100～200 ℃;
12) fuel-displaced back clear water with 60～75 ℃ cleans 20CrNiMo material drill bit workpiece;
13) under 150～160 ℃, carry out the tempering second time, tempering time at least 4 hours;
14) come out of the stove and air cooling to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102038264A CN102260779B (en) | 2011-07-20 | 2011-07-20 | Quenching method for 20CrNiMo material drill bit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102038264A CN102260779B (en) | 2011-07-20 | 2011-07-20 | Quenching method for 20CrNiMo material drill bit |
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| CN102260779A CN102260779A (en) | 2011-11-30 |
| CN102260779B true CN102260779B (en) | 2012-11-07 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103114192B (en) * | 2013-03-20 | 2014-08-27 | 沈阳飞机工业（集团）有限公司 | Micro-deformation quenching process of slender-rod like drill bits |
| CN104209720A (en) * | 2014-09-19 | 2014-12-17 | 马鞍山邦斯科自动化科技有限公司 | Manufacturing method of heat-resistant rock drill bit |
| CN104481409A (en) * | 2014-09-19 | 2015-04-01 | 马鞍山邦斯科自动化科技有限公司 | Manufacturing method of rock drill |
| CN104805451A (en) * | 2015-03-31 | 2015-07-29 | 西安煤矿机械有限公司 | Heat processing technology for improving impact energy of 20CrNiMo alloy steel |
| CN106048149A (en) * | 2016-07-16 | 2016-10-26 | 柳州科尔特锻造机械有限公司 | Heat treatment process of low-alloy steel |
| CN112795730B (en) * | 2020-12-24 | 2022-09-16 | 大冶特殊钢有限公司 | Heat treatment method for improving performance of drilling tool for down-the-hole drill |
| CN113249552B (en) * | 2021-05-26 | 2023-03-31 | 河南中原特钢装备制造有限公司 | Quenching and tempering heat treatment process for improving flaw detection clutter of 2Cr13 rotor |
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| CN1560311A (en) * | 2004-02-27 | 2005-01-05 | 天津工程机械研究院 | Wear-resisting cast steel and preparation method thereof |
| CN101476029B (en) * | 2009-01-06 | 2010-08-11 | 重庆跃进机械厂有限公司 | Heat treatment method for diesel engine cam |
| CN101831595B (en) * | 2010-04-26 | 2012-05-23 | 抚顺加氢炼化设备有限公司 | Rapid cooling thermal treatment method of 21/4Cr-1Mo-1/4V steel forging and automatic temperature-control inflation three-dimensional circulating water |
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Effective date of registration: 20170323 Address after: 430080 Hubei Province, Wuhan City Qingshan District factory St. Tsing King Road No. 10 Patentee after: Wuhan Iron & Steel Group Metallurgical Heavy Industry Co., Ltd. Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Granted publication date: 20121107 Termination date: 20180720 |