CN103114192A - Micro-deformation quenching process of slender-rod like drill bits - Google Patents
Micro-deformation quenching process of slender-rod like drill bits Download PDFInfo
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- CN103114192A CN103114192A CN2013100890314A CN201310089031A CN103114192A CN 103114192 A CN103114192 A CN 103114192A CN 2013100890314 A CN2013100890314 A CN 2013100890314A CN 201310089031 A CN201310089031 A CN 201310089031A CN 103114192 A CN103114192 A CN 103114192A
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Abstract
The invention discloses a micro-deformation quenching process of slender-rod like drill bits. The process comprises the following concrete steps of: (1) pre-heating; (2) heating; (3) de-stressing; (4) quenching; (5) straightening; (6) tempering; and (7) inspecting. The process disclosed by the invention can reduce bending deformation generated from a heat treatment process, and qualification rate can reach 100% without correction; and meanwhile, an effect of micro-deformation is achieved.
Description
Technical field
The present invention relates to a kind of micro deformation quenching processing method of slender rod type drill bit, belong to the material processing technology field.
Background technology
In the every field of mechanical workout, especially aviation field, when the processing Small-deep Hole, often can use various types of slender rod type drill bits, is that 15mm, length are the elongate rod drill bit of 250mm as diameter.And this cutter be processed into a difficult problem because this cutter easily produces certain distortion in cold working, in hot-work, be out of shape particularly remarkable.If can be good at reducing the distortion of slender rod type drill bit in hot-work, will improve significantly the quality of such cutter.Therefore how reducing the distortion that the slender rod type drill bit produces in the course of processing is the key of problem.
In prior art, usually can run into following several situation in processing the diastrophic heat-treatment technology method of slender rod type drill bit: (1) adopts the cold working process, though can obtain the release of stress, also has distortion; (2) adopt hot procedure, produce serious flexural deformation, affect the quality of product; (3) in quenching process, because the effect of acutely stirring with electrode magnetic field gravitation of salt bath liquid level produces buckling deformation; (4) adopt marquenching, make amount of bow at 0.4-2.7mm, deflection is larger, the alignment difficulty, and scrap rate is higher.
Summary of the invention
The purpose of this invention is to provide a kind of micro deformation quenching processing method of slender rod type drill bit, can reduce the flexural deformation that produces in heat treatment process, do not need to proofread and correct, qualification rate just can reach 100%, has reached simultaneously the effect of little distortion.
Technical scheme of the present invention: the micro deformation quenching processing method of slender rod type drill bit comprises following concrete steps:
(1) preheating: adopt three sections preheatings, the first paragraph preheating is slender rod type drill bit integral body to be placed on carry out preheating in fixture, preheating temperature is 540-560 ℃, be 0.8-1.2h warm up time, the second segment preheating remains slender rod type drill bit integral body is placed on carries out preheating in fixture, preheating temperature is 810-830 ℃, be 6.5-7.5min warm up time, the 3rd section preheating is slender rod type drill bit integral body to be placed on carry out preheating in fixture equally, preheating temperature is 1040-1060 ℃, and be 4.5-5.5min warm up time;
(2) heating: adopt the outage heating, control the temperature of salt bath furnace at 1280-1290 ℃, then whole the immersion in salt bath furnace of slender rod type drill bit after preheating being finished heated, the 1.5-2.5min that then cuts off the power supply, and the tapping temperature of slender rod type drill bit is at 1270-1280 ℃;
(3) destressing: the slender rod type drill bit is packed into to be sealed in can, cylinder iron bits are filled the space, then put into cabinet-type electric furnace 840-860 ℃ of heat tracing 1.4-1.6h, soaking time is closed cabinet-type electric furnace after arriving, the slender rod type drill bit, takes out at last the slender rod type drill bit and completes stress relief annealing to room temperature with the electric furnace air cooling;
(4) quench: adopting temperature is that 840-860 ℃, time are that the 2.5-3.5min laggard trip temperature that quenches for the first time is that 540-560 ℃, time are the quenching for the second time of 3.5-4.5min, air cooling 25-35s after twice quenching, again the slender rod type drill bit is entered in nitrate furnace, design temperature is 250-270 ℃ of isothermal 30min, and then quench for the third time again, the temperature of this time quenching is 115-125 ℃, and the time is 4.5-5.5min;
(5) alignment: the slender rod type drill bit after quenching is placed on and carries out hot school in pressing machine, proofreaies and correct the high spot of slender rod type drill bit;
(6) tempering: adopt double tempering, tempering for the first time adopts suspending way to carry out tempering, and tempering temperature is 540-560 ℃, and tempering time is 1.8-2.2h, and slow cooling is carried out tempering for the second time to room temperature; Tempering for the second time still adopts suspending way to carry out tempering, and tempering temperature is 540-560 ℃, and tempering time is 1.4-1.6h;
(7) censorship.
The structure of the described fixture of above-mentioned steps (1) is: comprise hook, clamping plate and removable clamping plate, hook is welded on clamping plate by solder joint, clamping plate are with the parallel placement of removable clamping plate and link together by screw and nut between the two, are distributed with several drill bit bore on removable clamping plate.
Beneficial effect of the present invention: the slender rod type drill bit is in this micro deformation quenching technique of process, its deflection is controlled at 0.03-0.07mm, thermal treatment sinuousness＜0.20mm, hardness reaches HRC64-66, toughness, red hardness, wear resistance all reach requirement, do not need to proofread and correct, and qualification rate reaches 100%, reach the effect of little distortion, effectively solved the problem that the slender rod type drill bit occurs bending and deformation.
Description of drawings
Fig. 1 is the structural representation of slender rod type drill bit of the present invention.
Fig. 2 is the structural representation of fixture of the present invention.
Embodiment
As shown in Figure 1, take diameter as 15mm, length is example as the elongate rod drill bit of 250mm, its micro deformation quenching processing method comprises following concrete steps:
(1) preheating: adopt three sections preheatings, the first paragraph preheating is slender rod type drill bit integral body to be placed on carry out preheating in fixture, preheating temperature is 550 ℃, be 1h warm up time, and the second segment preheating remains slender rod type drill bit integral body is placed on carries out preheating in fixture, and preheating temperature is 820 ℃, be 7min warm up time, the 3rd section preheating is slender rod type drill bit integral body to be placed on carry out preheating in fixture equally, and preheating temperature is 1050 ℃, and be 5min warm up time;
(2) heating: adopt the outage heating, control the temperature of salt bath furnace at 1285 ℃, the whole immersion in salt bath furnace of slender rod type drill bit after then preheating being finished heated, the 1min that then cuts off the power supply, and the tapping temperature of slender rod type drill bit is at 1275 ℃;
(3) destressing: the slender rod type drill bit is packed into to be sealed in can, cylinder iron bits are filled the space, then put into cabinet-type electric furnace 840-860 ℃ of heat tracing 1.5h, soaking time is closed cabinet-type electric furnace after arriving, the slender rod type drill bit, takes out at last the slender rod type drill bit and completes stress relief annealing to room temperature with the electric furnace air cooling;
(4) quench: adopting temperature is that 850 ℃, time are that the 3min laggard trip temperature that quenches for the first time is that 550 ℃, time are the quenching for the second time of 4min, air cooling 30s after twice quenching, again the slender rod type drill bit is entered in nitrate furnace, design temperature is 260 ℃ of isothermal 30min, and then quench for the third time again, the temperature of this time quenching is 110 ℃, and the time is 5min;
(5) alignment: the slender rod type drill bit after quenching is placed on and carries out hot school in pressing machine, proofreaies and correct the high spot of slender rod type drill bit;
(6) tempering: adopt double tempering, tempering for the first time adopts suspending way to carry out tempering, and tempering temperature is 550 ℃, and tempering time is 2h, and slow cooling is carried out tempering for the second time to room temperature; Tempering for the second time still adopts suspending way to carry out tempering, and tempering temperature is 550 ℃, and tempering time is 1.5h;
(7) censorship.
As shown in Figure 2, in step (1), the structure of fixture is: comprise hook 2, clamping plate 1 and removable clamping plate 8, hook 2 is welded on clamping plate 1 by solder joint 3, clamping plate 1 are with the parallel placement of removable clamping plate 8 and link together by screw 4 and nut 6 between the two, are distributed with several drill bit bore 7 on removable clamping plate 8.During use, first unscrew screw 4 and nut 6, regulate the distance between clamping plate 1 and removable clamping plate 8, then place after the drill bit drill bit bore 7 with 9SiCr pin reamer, tighten screw 4 and nut 6 this moment, stable being clipped in of 9SiCr pin reamer regulated between clamping plate 1 and removable clamping plate 8, quenched by mentioning hook 2.
Diameter be 15mm, length be the elongate rod drill bit of 250mm after adopting above-mentioned processing method, its deflection is controlled at 0.05mm, the thermal treatment sinuousness is 0.17mm, hardness reaches HRC65, toughness, red hardness, wear resistance all reach requirement, do not need to proofread and correct, and qualification rate reaches 100%.
Claims (1)
1. the micro deformation quenching processing method of slender rod type drill bit, is characterized in that, comprises following concrete steps:
(1) preheating: adopt three sections preheatings, the first paragraph preheating is slender rod type drill bit integral body to be placed on carry out preheating in fixture, preheating temperature is 540-560 ℃, be 0.8-1.2h warm up time, the second segment preheating remains slender rod type drill bit integral body is placed on carries out preheating in fixture, preheating temperature is 810-830 ℃, be 6.5-7.5min warm up time, the 3rd section preheating is slender rod type drill bit integral body to be placed on carry out preheating in fixture equally, preheating temperature is 1040-1060 ℃, and be 4.5-5.5min warm up time;
(2) heating: adopt the outage heating, control the temperature of salt bath furnace at 1280-1290 ℃, then whole the immersion in salt bath furnace of slender rod type drill bit after preheating being finished heated, the 1.5-2.5min that then cuts off the power supply, and the tapping temperature of slender rod type drill bit is at 1270-1280 ℃;
(3) destressing: the slender rod type drill bit is packed into to be sealed in can, cylinder iron bits are filled the space, then put into cabinet-type electric furnace 840-860 ℃ of heat tracing 1.4-1.6h, soaking time is closed cabinet-type electric furnace after arriving, the slender rod type drill bit, takes out at last the slender rod type drill bit and completes stress relief annealing to room temperature with the electric furnace air cooling;
(4) quench: adopting temperature is that 840-860 ℃, time are that the 2.5-3.5min laggard trip temperature that quenches for the first time is that 540-560 ℃, time are the quenching for the second time of 3.5-4.5min, air cooling 25-35s after twice quenching, again the slender rod type drill bit is entered in nitrate furnace, design temperature is 250-270 ℃ of isothermal 30min, and then quench for the third time again, the temperature of this time quenching is 115-125 ℃, and the time is 4.5-5.5min;
(5) alignment: the slender rod type drill bit after quenching is placed on and carries out hot school in pressing machine, proofreaies and correct the high spot of slender rod type drill bit;
(6) tempering: adopt double tempering, tempering for the first time adopts suspending way to carry out tempering, and tempering temperature is 540-560 ℃, and tempering time is 1.8-2.2h, and slow cooling is carried out tempering for the second time to room temperature; Tempering for the second time still adopts suspending way to carry out tempering, and tempering temperature is 540-560 ℃, and tempering time is 1.4-1.6h;
(7) censorship.
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| CN201310089031.4A CN103114192B (en) | 2013-03-20 | 2013-03-20 | Micro-deformation quenching process of slender-rod like drill bits |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276183A (en) * | 2013-06-14 | 2013-09-04 | 沈阳飞机工业（集团）有限公司 | Heat treatment process for high-speed steel sheet side and face milling cutter |
| CN105349760A (en) * | 2015-12-14 | 2016-02-24 | 陕西渭河工模具有限公司 | Anti-deformation salt-bath furnace quenching process for hand-use tapered pin reamer |
| CN107058688A (en) * | 2017-06-21 | 2017-08-18 | 合肥博创机械制造有限公司 | A kind of drill pipe body heat treatment method |
| CN108486349A (en) * | 2018-05-09 | 2018-09-04 | 合肥汇之新机械科技有限公司 | A kind of heat treatment process of twist bit alloy tool steel bit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276183A (en) * | 2013-06-14 | 2013-09-04 | 沈阳飞机工业（集团）有限公司 | Heat treatment process for high-speed steel sheet side and face milling cutter |
| CN103276183B (en) * | 2013-06-14 | 2015-09-09 | 沈阳飞机工业（集团）有限公司 | Rapid steel thin slice face and side cutter thermal treatment process |
| CN105349760A (en) * | 2015-12-14 | 2016-02-24 | 陕西渭河工模具有限公司 | Anti-deformation salt-bath furnace quenching process for hand-use tapered pin reamer |
| CN107058688A (en) * | 2017-06-21 | 2017-08-18 | 合肥博创机械制造有限公司 | A kind of drill pipe body heat treatment method |
| CN108486349A (en) * | 2018-05-09 | 2018-09-04 | 合肥汇之新机械科技有限公司 | A kind of heat treatment process of twist bit alloy tool steel bit |
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