CN102719645B - Heat treatment method for twist drills - Google Patents
Heat treatment method for twist drills Download PDFInfo
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- CN102719645B CN102719645B CN201210161541.3A CN201210161541A CN102719645B CN 102719645 B CN102719645 B CN 102719645B CN 201210161541 A CN201210161541 A CN 201210161541A CN 102719645 B CN102719645 B CN 102719645B
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Abstract
The present invention relates to a heat treatment method for twist drills. The method comprises the steps in turn as follows: a. preheating the twist drills to be treated for the first time at a temperature in a range from 400 DEG C to 500 DEG C for a time in the range of from three hours to four hours; b. quenching the first pre-heated twist drills, and the quenching includes the steps as follows: pre-heating the twist drills for the second time at a temperature in the range of from 860 DEG C to 880 DEG C for a time in the range of from three minutes to twelve minutes; pre-heating the second pre-heated twist drills for the third time at a temperature in the range of from 1050 DEG C to 1080 DEG C for a time in the range of from three minutes to twelve minutes; and high-temperature treating the third pre-heated twist drills at a temperature in the range of from 1225 DEG C to 1235 DEG C; c. cooling the quenched twist drills at a temperature in the range of from 500 DEG C to 550 DEG C for a time in the range of from three minutes to twelve minutes; d. tempering the cooled twist drills at a temperature in the range of from 550 DEG C to 570 DEG C for a time in the range of from one hour and a half to two hours. The method can obviously improve the hardness property, the toughness property and the red hardness property of the twist drills.
Description
Technical field
The present invention relates to a kind of twist drill heat treating method.
Background technology
After twist drill cutting forming, need to heat-treat, Main Function is hardness, toughness and the red hardness in order to improve twist drill.The heat treatment step of prior art comprises quenching, cooling process, tempering successively, and the temperature and time of quenching, cooling process, tempering is unreasonable, causes twist drill hardness, toughness, red hardness after thermal treatment not good.
Summary of the invention
Technical problem to be solved by this invention is overcome deficiency of the prior art and a kind of twist drill heat treating method is provided, and can improve hardness, toughness and the red hardness of twist drill.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of twist drill heat treating method, is characterized in that: in turn include the following steps:
A, pending twist drill carry out preheating for the first time at 400～500 ℃, and the time is 3～4 hours;
B, the twist drill after preheating is for the first time quenched, quenching comprises the steps:
Twist drill carries out preheating for the second time at 860～880 ℃, and the time is 3～12 minutes;
Twist drill after preheating is for the second time carried out at 1050～1080 ℃ to preheating for the third time, the time is 3～12 minutes;
Twist drill after preheating is for the third time carried out at 1225～1235 ℃ to pyroprocessing, the pyroprocessing time calculates according to following formula: t=α * D, and t is the pyroprocessing time, unit is second, and D is twist drill net thickness, and unit is millimeter, α is heating coefficient, and α is 13～15 seconds/millimeter;
C, the twist drill after quenching is carried out cooling, heat-eliminating medium comprises 50% calcium chloride, 30% bariumchloride, 20% sodium-chlor by weight percentage, and cooling temperature is 500～550 ℃, and the time is 3～12 minutes;
D, cooled twist drill is carried out to tempering, tempering temperature is 550～570 ℃, and the time is 1.5～2 hours.
In rapid a of the present invention, pending twist drill carries out preheating for the first time at 450 ℃, and the time is 3.5 hours.
In step b of the present invention, twist drill carries out preheating for the second time at 870 ℃, and the time is 8 minutes.
In step b of the present invention, the twist drill after preheating is for the second time carried out at 1065 ℃ to preheating for the third time, the time is 8 minutes.
In step b of the present invention, the twist drill after preheating is for the third time carried out at 1230 ℃ to pyroprocessing, the pyroprocessing time calculates according to following formula: t=α * D, α is 14 seconds/millimeter.
In step c of the present invention, the twist drill after quenching is carried out cooling, cooling temperature is 530 ℃, and the time is 8 minutes.
Of the present invention cooled twist drill is carried out to tempering, tempering temperature is 560 ℃, and the time is 1.7 hours.
Compared with prior art, tool has the following advantages and effect in the present invention: the hardness of twist drill, toughness, red hardness performance are improved significantly.
Embodiment
Below by embodiment, the invention will be further described.
The present invention in turn includes the following steps:
A, pending twist drill carry out preheating for the first time at 400～500 ℃, and the time is 3～4 hours.This step effect is the unrelieved stress of eliminating twist drill, in preventing from quenching, occurs crackle, has effectively improved the quality of twist drill.
B, the twist drill after preheating is for the first time quenched, quenching comprises the steps:
Twist drill carries out preheating for the second time at 860～880 ℃, and the time is 3～12 minutes; Twist drill after preheating is for the second time carried out at 1050～1080 ℃ to preheating for the third time, the time is 3～12 minutes.By preheating for the second time and preheating for the third time, make the abundant preheating of twist drill, twist drill partial austenitizing, has shortened the heat time, raises the efficiency.
Twist drill after preheating is for the third time carried out at 1225～1235 ℃ to pyroprocessing, the pyroprocessing time calculates according to following formula: t=α * D, and t is the pyroprocessing time, unit is second, and D is twist drill net thickness, and unit is millimeter, α is heating coefficient, and α is 13～15 seconds/millimeter.Twist drill complete austenitizing after pyroprocessing, autstenitic grain size is 9.5～10, twist drill hardness, toughness, the red hardness after thermal treatment is better like this.The twist drill net thickness that the present invention mentions, refers to the net thickness of twist drill drill body, if drill body net thickness disunity, as the drill body of taper, is got this drill body average effective thickness.Net thickness is common practise title in drill bit field.
C, the twist drill after quenching is carried out in heat-eliminating medium cooling, cooling temperature is 500～550 ℃, and the time is 3～12 minutes; Heat-eliminating medium comprises 50% calcium chloride, 30% bariumchloride, 20% sodium-chlor by weight percentage, and the formula of this heat-eliminating medium makes cooling performance better.
D, cooled twist drill is carried out to tempering, tempering temperature is 550～570 ℃, and the time is 1.5～2 hours, and this step can be carried out four times, makes the complete formation of martensite of twist drill.
Embodiment 1:
The present embodiment in turn includes the following steps:
A, pending twist drill carry out preheating for the first time at 400 ℃, and the time is 3 hours.
B, the twist drill after preheating is for the first time quenched, quenching comprises the steps:
Twist drill carries out preheating for the second time at 860 ℃, and the time is 3 minutes;
Twist drill after preheating is for the second time carried out at 1050 ℃ to preheating for the third time, the time is 3 minutes;
Twist drill after preheating is for the third time carried out at 1225 ℃ to pyroprocessing, the pyroprocessing time calculates according to following formula: t=α * D, and t is the pyroprocessing time, and unit is second, and D is twist drill net thickness, and unit is millimeter, α is 13 seconds/millimeter;
C, the twist drill after quenching is carried out cooling, cooling temperature is 500 ℃, and the time is 3 minutes;
D, cooled twist drill is carried out to tempering, tempering temperature is 550 ℃, and the time is 1.5 hours, and this step can be carried out four times, makes the complete formation of martensite of twist drill.
Embodiment 2:
The present embodiment in turn includes the following steps:
A, pending twist drill carry out preheating for the first time at 450 ℃, and the time is 3.5 hours;
B, the twist drill after preheating is for the first time quenched, quenching comprises the steps:
Twist drill carries out preheating for the second time at 870 ℃, and the time is 8 minutes;
Twist drill after preheating is for the second time carried out at 1065 ℃ to preheating for the third time, the time is 8 minutes;
Twist drill after preheating is for the third time carried out at 1230 ℃ to pyroprocessing, the pyroprocessing time calculates according to following formula: t=α * D, and t is the pyroprocessing time, and unit is second, and D is twist drill net thickness, and unit is millimeter, α is 14 seconds/millimeter;
C, the twist drill after quenching is carried out cooling, cooling temperature is 530 ℃, and the time is 8 minutes;
D, cooled twist drill is carried out to tempering, tempering temperature is 560 ℃, and the time is 1.7 hours, and this step can be carried out four times, makes the complete formation of martensite of twist drill.
Embodiment 3:
A, pending twist drill carry out preheating for the first time at 500 ℃, and the time is 4 hours;
B, the twist drill after preheating is for the first time quenched, quenching comprises the steps:
Twist drill carries out preheating for the second time at 880 ℃, and the time is 12 minutes;
Twist drill after preheating is for the second time carried out at 1080 ℃ to preheating for the third time, the time is 12 minutes;
Twist drill after preheating is for the third time carried out at 1235 ℃ to pyroprocessing, the pyroprocessing time calculates according to following formula: t=15 * D, and t is the pyroprocessing time, and unit is second, and D is twist drill net thickness, and unit is millimeter;
C, the twist drill after quenching is carried out cooling, cooling temperature is 550 ℃, and the time is 12 minutes;
D, cooled twist drill is carried out to tempering, tempering temperature is 570 ℃, and the time is 2 hours, and this step can be carried out four times, makes the complete formation of martensite of twist drill.
Claims (1)
1. a twist drill heat treating method, is characterized in that: in turn include the following steps:
A, pending twist drill carry out preheating for the first time at 400～500 ℃, and the time is 3～4 hours;
B, the twist drill after preheating is for the first time quenched, quenching comprises the steps:
Twist drill carries out preheating for the second time at 860～880 ℃, and the time is 3～12 minutes;
Twist drill after preheating is for the second time carried out at 1050～1080 ℃ to preheating for the third time, the time is 3～12 minutes;
Twist drill after preheating is for the third time carried out at 1225～1235 ℃ to pyroprocessing, the pyroprocessing time calculates according to following formula: t=α * D, t is the pyroprocessing time, unit is second, D is twist drill net thickness, unit is millimeter, and α is heating coefficient, and α is 13～15 seconds/millimeter;
C, the twist drill after quenching is carried out cooling, heat-eliminating medium comprises 50% calcium chloride, 30% bariumchloride, 20% sodium-chlor by weight percentage, and cooling temperature is 500～550 ℃, and the time is 3～12 minutes;
D, cooled twist drill is carried out to tempering, tempering temperature is 550～570 ℃, and the time is 1.5～2 hours.
2. according to the twist drill heat treating method described in claim 1, it is characterized in that: in step a, pending twist drill exists
At 450 ℃, carry out preheating for the first time, the time is 3.5 hours.
3. according to the twist drill heat treating method described in claim 1, it is characterized in that: in step b, twist drill is at 870 ℃
Under carry out preheating for the second time, the time is 8 minutes.
4. according to the twist drill heat treating method described in claim 1, it is characterized in that: in step b, by after preheating for the second time
Twist drill at 1065 ℃, carry out preheating for the third time, the time is 8 minutes.
5. according to the twist drill heat treating method described in claim 1, it is characterized in that: in step b, by after preheating for the third time
Twist drill at 1230 ℃, carry out pyroprocessing, the pyroprocessing time calculates according to following formula: t=α * D, α is 14 seconds/millimeter.
6. according to the twist drill heat treating method described in claim 1, it is characterized in that: in step c, to the fried dough twist after quenching
Creep into row cooling, cooling temperature is 530 ℃, and the time is 8 minutes.
7. according to the twist drill heat treating method described in claim 1, it is characterized in that: cooled twist drill is returned
Fire, tempering temperature is 560 ℃, the time is 1.7 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210161541.3A CN102719645B (en) | 2012-05-23 | 2012-05-23 | Heat treatment method for twist drills |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210161541.3A CN102719645B (en) | 2012-05-23 | 2012-05-23 | Heat treatment method for twist drills |
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| Publication Number | Publication Date |
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| CN102719645A CN102719645A (en) | 2012-10-10 |
| CN102719645B true CN102719645B (en) | 2014-08-27 |
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| CN201210161541.3A Active CN102719645B (en) | 2012-05-23 | 2012-05-23 | Heat treatment method for twist drills |
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Families Citing this family (1)
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085257A (en) * | 1992-09-29 | 1994-04-13 | 北京科技大学 | A kind of V3N super-hard high-speed steel thermal treatment process |
| CN1718775A (en) * | 2005-06-28 | 2006-01-11 | 季胜华 | Low temperature quencing heat treatment technology of high speed steel saw blade |
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2012
- 2012-05-23 CN CN201210161541.3A patent/CN102719645B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085257A (en) * | 1992-09-29 | 1994-04-13 | 北京科技大学 | A kind of V3N super-hard high-speed steel thermal treatment process |
| CN1718775A (en) * | 2005-06-28 | 2006-01-11 | 季胜华 | Low temperature quencing heat treatment technology of high speed steel saw blade |
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| CN102719645A (en) | 2012-10-10 |
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Denomination of invention: Heat treatment method for twist drills Effective date of registration: 20180907 Granted publication date: 20140827 Pledgee: Zhejiang Tyrone commercial bank Limited by Share Ltd Taizhou Wenling branch Pledgor: Wenling Yongxin Tool Co.,Ltd. Registration number: 2018330000267 |