CN101653905A - Method for manufacturing drilling bit - Google Patents

Method for manufacturing drilling bit Download PDF

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Publication number
CN101653905A
CN101653905A CN200910184514A CN200910184514A CN101653905A CN 101653905 A CN101653905 A CN 101653905A CN 200910184514 A CN200910184514 A CN 200910184514A CN 200910184514 A CN200910184514 A CN 200910184514A CN 101653905 A CN101653905 A CN 101653905A
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CN
China
Prior art keywords
workpiece
grinding
tempering
time
minutes
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CN200910184514A
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Chinese (zh)
Inventor
朱剑鑫
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CHANGZHOU WANSUI TOOL PLANT
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CHANGZHOU WANSUI TOOL PLANT
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Application filed by CHANGZHOU WANSUI TOOL PLANT filed Critical CHANGZHOU WANSUI TOOL PLANT
Priority to CN200910184514A priority Critical patent/CN101653905A/en
Publication of CN101653905A publication Critical patent/CN101653905A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to the manufacturing field drilling bits, in particular a method for manufacturing a drilling bit. The method for manufacturing the drilling bit comprises the steps of snagging,slot rolling, cutting and sharpening, coarse grinding before heat treatment, heat treatment, coarse grinding of excircle, handle flat head chamfering, opening, fine grinding of excircle, edge finishing and cleaning. The invention has the advantages of low cost, excellent performance and longer service life.

Description

Make the method for drill bit
Technical field
The invention belongs to drill bit and make field, especially a kind of method of making drill bit.
Background technology
Present drill bit is made up of helicla flute part and shank, general drill bit is by rolling formation, rolling brill is bar to be heated go out helicla flute with roll pressed, its advantage is the production efficiency height, material fiber is not cut off after the hot rolling, the good physical performance of finished product, save material and save emery wheel consumption, shortcoming is that the helicla flute rough surface influences bits, and it is poor that the helicla flute cross section geometric forms, precision is low, and two helicla flute symmetry usually do not reach standard and scrap, can only be used for coarse processing, along with the raising of processing request, although rolling brill has good physical performance, the durability height, advantage of low manufacturing cost can will progressively be eliminated because of low precision.
Summary of the invention
The present invention is directed to that rolling auger shell spin slot rough surface, drill bit can't be used for accurately machined shortcoming in the above-mentioned technology, propose a kind of method of making drill bit, the drill bit that utilizes the method to make is sharp, can be used for fine finishining.
Realize that technical scheme of the present invention is as follows:
Make the method for drill bit, it is characterized in that: this method step is as follows,
A, snagging are carried out grinding with the coarse fodder steel, grind off surperficial casting skin, make coarse fodder steel smooth surface not have screw-like, do not have the burn phenomenon, obtain blank after the grinding, are removing pigment and greasy dirt;
B, roll groove, be rolled groove with obtaining blank in a step on roll mill, obtain having the workpiece 1 of flute, the difference of 1 liang of leaf of workpiece is smaller or equal to 0.10 millimeter, unbearable symmetry δ 3Smaller or equal to 0.25 millimeter, the point of contact of circular arc and main cutting edge throwing shape line is lower than drill axis at the bottom of the flute, and working portion is to the circular radial jumping amount δ of axis 1Smaller or equal to 0.25 millimeter;
C, cutting sharpening, the workpiece 1 that the b step is obtained cuts into the workpiece 2 of needed length L, and the sharpening angle is 118 ℃---122 ℃;
D, cylindrical grinding burr carry out grinding with the external diameter of the workpiece 2 that obtains in the c step, make workpiece 2 smooth surfaces not have screw thread, do not have burn;
The workpiece 2 that obtains in the d step is heat-treated in e, heat treatment, and heat treated step is as follows,
(1), preheating, be preheating in 800 ℃-860 ℃ the salt bath in temperature, the time is the twice of required heat time heating time, the salt bath composition is the NaCl of 70%BaCl and 30%;
(2), the heating, in high-temperature salt bath, carry out, salt temperature is 1200 ℃-1300 ℃, the salt bath composition is 100%BaCl;
(3), the cooling, in low temperature salt-bath, carry out, 500 ℃-600 ℃ of temperature, the time is identical with heat time heating time, the salt bath composition is 50%KNO 3And 50%NaNO 2
(4), tempering, workpiece 2 is carried out tempering, temperature is 500 ℃-600 ℃, the salt bath composition is 100%NaNO 3Perhaps 100%KNO 3, times of tempering 3-4 time, each 60 minutes of tempering time must coldly can be carried out tempering next time to room temperature after each tempering, and the tempering rank is the 1-1.5 level;
F, corase grind cylindrical carry out grinding with workpiece 2 once more;
G, shank flat head chamfering, the shank end face car of workpiece 2 is flat, and end face is vertical with center line of bit, and chamfering is even, no prismatic shape, chamfering 1*45 °;
H, opening make cutting edge sharp workpiece 2 openings, and two main cutting edges are straight and be symmetrical in the working portion axis, and chisel edge is by the working portion axis, and main cutting edge is to the oblique round jumping amount δ of working portion 2Smaller or equal to 0.18 millimeter;
I, correct grinding cylindrical obtain workpiece 2 with h in the step and finish grind cylindrical;
Grinding is carried out on workpiece 2 surfaces in j, clear limit, makes its no blackspot in surface and burn phenomenon, obtains drill bit;
K, nitrogenize are carried out nitrogenize with drill bit, and step is as follows,
(1) deoil, boiled 30 minutes in the aqueous solution of 8% sodium carbonate and 2% tertiary sodium phosphate, workpiece is rinsed well with running water after going out oil cauldron;
(2) pickling, pickling is 3 minutes-5 minutes in the hydrochloric acid solution of 20%-25%, rinses well with running water after the workpiece pickling;
(3) clean, in 4% detergent solution, boiled 8 minutes-10 minutes;
(4) workpiece is gone in 500 ℃-600 ℃ the nitriding furnace to keep 3.5 to 4.5 hours, and drips ammoniacal liquor on workpiece, the ammoniacal liquor amount of dripping be 100-150 drip/minute;
1, cleans, wash the dirt on the drill bit.
Described cleaning agent is a metal cleaner.
The drill bit that adopts said method to make, on rolling tool, polish, surface roughness at the bottom of the raising groove, a groove, land and cylindrical quench after grinding forms, thereby it does not destroy metallic fiber, add that remainder mill amount is little, be unlikely to produce drill bit annealing phenomenon, make its land abundant again, intensity increases, and cutting edge is sharp.Useful benefit of the present invention is that cost is low, and performance is more excellent, long service life.
The specific embodiment
Make the method for drill bit, it is characterized in that: this method step is as follows, with outside dimension is
A, snagging are carried out grinding with the coarse fodder steel, grind off surperficial casting skin, make coarse fodder steel smooth surface not have screw-like, do not have the burn phenomenon, obtain blank after the grinding, are removing pigment and greasy dirt;
B, roll groove, be rolled groove with obtaining blank in a step on roll mill, obtain having the workpiece 1 of flute, the difference of 1 liang of leaf of workpiece is smaller or equal to 0.10 millimeter, unbearable symmetry δ 3Smaller or equal to 0.25 millimeter, the point of contact of circular arc and main cutting edge throwing shape line is lower than drill axis at the bottom of the flute, and working portion is to the circular radial jumping amount δ of axis 1Smaller or equal to 0.25 millimeter;
C, cutting sharpening, the workpiece 1 that the b step is obtained cuts into the workpiece 2 of needed length L, and the sharpening angle is 120 ℃;
D, cylindrical grinding burr carry out grinding with the external diameter of the workpiece 2 that obtains in the c step, make workpiece 2 smooth surfaces not have screw thread, do not have burn;
The workpiece 2 that obtains in the d step is heat-treated in e, heat treatment, and heat treated step is as follows,
(1), preheating, be preheating in 800 ℃ the salt bath in temperature, the time is the twice of required heat time heating time, the salt bath composition is the NaCl of 70%BaCl and 30%;
(2), the heating, in high-temperature salt bath, carry out, salt temperature is 1200 ℃, the salt bath composition is 100%BaCl;
(3), the cooling, in low temperature salt-bath, carry out, 500 ℃ of temperature, the time is identical with heat time heating time, the salt bath composition is 50%KNO 3And 50%NaNO 2
(4), tempering, workpiece 2 is carried out tempering, temperature is 600 ℃, the salt bath composition is 100%NaNO 3Perhaps 100%KNO 3, times of tempering 4 times, each 60 minutes of tempering time must be cold after each tempering can be carried out tempering next time to room temperature;
F, corase grind cylindrical carry out grinding with workpiece 2 once more;
G, shank flat head chamfering, the shank end face car of workpiece 2 is flat, and end face is vertical with center line of bit, and chamfering is even, no prismatic shape, chamfering 1*45 °;
H, opening make cutting edge sharp workpiece 2 openings, and two main cutting edges are straight and be symmetrical in the working portion axis, and chisel edge is by the working portion axis, and main cutting edge is to the oblique round jumping amount δ of working portion 2Smaller or equal to 0.18 millimeter;
I, correct grinding cylindrical obtain workpiece 2 with h in the step and finish grind cylindrical;
Grinding is carried out on workpiece 2 surfaces in j, clear limit, makes its no blackspot in surface and burn phenomenon, obtains drill bit;
K, nitrogenize are carried out nitrogenize with drill bit, and step is as follows,
(1) deoil, boiled 30 minutes in the aqueous solution of 8% sodium carbonate and 2% tertiary sodium phosphate, workpiece is rinsed well with running water after going out oil cauldron;
(2) pickling, pickling is 5 minutes in the hydrochloric acid solution of 20%-25%, rinses well with running water after the workpiece pickling;
(3) clean, in 4% metal cleaner solution, boiled 10 minutes;
(4) workpiece is gone in 500 ℃-600 ℃ the nitriding furnace to keep 4 hours, and drip ammoniacal liquor on workpiece, the ammoniacal liquor amount of dripping is 150 droplets/minute;
1, cleans, wash the dirt on the drill bit.

Claims (2)

1, make the method for drill bit, it is characterized in that: this method step is as follows,
A, snagging are carried out grinding with the coarse fodder steel, grind off surperficial casting skin, make coarse fodder steel smooth surface not have screw-like, do not have the burn phenomenon, obtain blank after the grinding, are removing pigment and greasy dirt;
B, roll groove, be rolled groove with obtaining blank in a step on roll mill, obtain having the workpiece 1 of flute, the difference of 1 liang of leaf of workpiece is smaller or equal to 0.10 millimeter, unbearable symmetry δ 3Smaller or equal to 0.25 millimeter, the point of contact of circular arc and main cutting edge throwing shape line is lower than drill axis at the bottom of the flute, and working portion is to the circular radial jumping amount δ of axis 1Smaller or equal to 0.25 millimeter;
C, cutting sharpening, the workpiece 1 that the b step is obtained cuts into the workpiece 2 of needed length L, and the sharpening angle is 118 ℃-122 ℃;
D, cylindrical grinding burr carry out grinding with the external diameter of the workpiece 2 that obtains in the c step, make workpiece 2 smooth surfaces not have screw thread, do not have burn;
The workpiece 2 that obtains in the d step is heat-treated in e, heat treatment, and heat treated step is as follows,
(1), preheating, be preheating in 800 ℃-860 ℃ the salt bath in temperature, the time is the twice of required heat time heating time, the salt bath composition is the NaCl of 70%BaCl and 30%;
(2), the heating, in high-temperature salt bath, carry out, salt temperature is 1200 ℃-1300 ℃, the salt bath composition is 100%BaCl;
(3), the cooling, in low temperature salt-bath, carry out, 500 ℃-600 ℃ of temperature, the time is identical with heat time heating time, the salt bath composition is 50%KNO 3And 50%NaNO 2
(4), tempering, workpiece 2 is carried out tempering, temperature is 500 ℃-600 ℃, the salt bath composition is 100%NaNO 3Perhaps 100%KNO 3, times of tempering 3-4 time, each 60 minutes of tempering time must be cold after each tempering can be carried out tempering next time to room temperature;
F, corase grind cylindrical carry out grinding with workpiece 2 once more;
G, shank flat head chamfering, the shank end face car of workpiece 2 is flat, and end face is vertical with center line of bit, and chamfering is even, no prismatic shape, chamfering 1*45 °;
H, opening make cutting edge sharp workpiece 2 openings, and two main cutting edges are straight and be symmetrical in the working portion axis, and chisel edge is by the working portion axis, and main cutting edge is to the oblique round jumping amount δ of working portion 2Smaller or equal to 0.18 millimeter;
I, correct grinding cylindrical obtain workpiece 2 with h in the step and finish grind cylindrical;
Grinding is carried out on workpiece 2 surfaces in j, clear limit, makes its no blackspot in surface and burn phenomenon, obtains drill bit;
K, nitrogenize are carried out nitrogenize with drill bit, and step is as follows,
(1) deoil, boiled 30 minutes in the aqueous solution of 8% sodium carbonate and 2% tertiary sodium phosphate, workpiece is rinsed well with running water after going out oil cauldron;
(2) pickling, pickling is 3 minutes-5 minutes in the hydrochloric acid solution of 20%-25%, rinses well with running water after the workpiece pickling;
(3) clean, in 4% detergent solution, boiled 8 minutes-10 minutes;
(4) workpiece is gone in 500 ℃-600 ℃ the nitriding furnace to keep 3.5 to 4.5 hours, and drips ammoniacal liquor on workpiece, the ammoniacal liquor amount of dripping be 100-150 drip/minute;
Clean, wash the dirt on the drill bit.
2, want the method for 1 described manufacturing drill bit according to right, it is characterized in that: described cleaning agent is a metal cleaner.
CN200910184514A 2009-08-28 2009-08-28 Method for manufacturing drilling bit Pending CN101653905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200910184514A CN101653905A (en) 2009-08-28 2009-08-28 Method for manufacturing drilling bit

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Application Number Priority Date Filing Date Title
CN200910184514A CN101653905A (en) 2009-08-28 2009-08-28 Method for manufacturing drilling bit

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CN101653905A true CN101653905A (en) 2010-02-24

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102703911A (en) * 2012-06-29 2012-10-03 长沙黑金刚实业有限公司 Heat treatment method for down-the-hole drill bit of high-wind pressure drilling tool, and drill bit
CN102837169A (en) * 2011-06-21 2012-12-26 祁成 Production method of milling cutter
CN103223579A (en) * 2013-04-16 2013-07-31 常熟市三骏精密刃具制造厂 Manufacturing method of milling cutter
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
CN105134082A (en) * 2015-07-24 2015-12-09 盐城市鑫源铜业有限公司 Heavy-duty annular drill bit and manufacturing method for same
CN105397438A (en) * 2015-12-31 2016-03-16 武汉江钻恒立工程钻具股份有限公司 Manufacture method of way-type drilling unit
CN106181279A (en) * 2016-08-10 2016-12-07 台州华达工量具制造有限公司 A kind of processing technique of cutter head changeable type depth drill
CN106670550A (en) * 2015-11-05 2017-05-17 扬州市实力五金工具工贸有限公司 Drilling and chamfering synthesis tool and manufacturing method thereof
CN107363203A (en) * 2017-07-21 2017-11-21 江苏军威电子科技有限公司 A kind of cold-heading molding technique of drill bit
CN108070820A (en) * 2017-12-22 2018-05-25 江雨仙 T7 steel blades and its intensifying method
CN109773437A (en) * 2019-03-26 2019-05-21 丹阳市丹鹰工具制造有限公司 A kind of processing technology of drill
CN110369979A (en) * 2019-08-19 2019-10-25 丹阳河工工具有限公司 A kind of processing technology of anti-breaking type screw tap
CN111673403A (en) * 2020-05-29 2020-09-18 贵州泰和超硬工具股份有限公司 Hard alloy twist drill rod grinding process
CN112846315A (en) * 2020-12-31 2021-05-28 苏州用朴精密科技有限公司 Hard alloy drill bit and machining process thereof

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102837169A (en) * 2011-06-21 2012-12-26 祁成 Production method of milling cutter
CN102703911B (en) * 2012-06-29 2014-03-05 长沙黑金刚实业有限公司 Heat treatment method for down-the-hole drill bit of high-wind pressure drilling tool, and drill bit
CN102703911A (en) * 2012-06-29 2012-10-03 长沙黑金刚实业有限公司 Heat treatment method for down-the-hole drill bit of high-wind pressure drilling tool, and drill bit
CN103223579B (en) * 2013-04-16 2015-08-26 常熟市三骏精密刃具制造厂 The manufacture method of milling cutter
CN103223579A (en) * 2013-04-16 2013-07-31 常熟市三骏精密刃具制造厂 Manufacturing method of milling cutter
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
CN105134082A (en) * 2015-07-24 2015-12-09 盐城市鑫源铜业有限公司 Heavy-duty annular drill bit and manufacturing method for same
CN105134082B (en) * 2015-07-24 2018-10-26 盐城市鑫源铜业有限公司 A kind of manufacturing method of heavy type annular bit
CN106670550A (en) * 2015-11-05 2017-05-17 扬州市实力五金工具工贸有限公司 Drilling and chamfering synthesis tool and manufacturing method thereof
CN105397438A (en) * 2015-12-31 2016-03-16 武汉江钻恒立工程钻具股份有限公司 Manufacture method of way-type drilling unit
CN106181279B (en) * 2016-08-10 2018-02-13 台州华达工量具制造有限公司 A kind of processing technology of cutter head changeable type depth drill
CN106181279A (en) * 2016-08-10 2016-12-07 台州华达工量具制造有限公司 A kind of processing technique of cutter head changeable type depth drill
CN107363203A (en) * 2017-07-21 2017-11-21 江苏军威电子科技有限公司 A kind of cold-heading molding technique of drill bit
CN108070820A (en) * 2017-12-22 2018-05-25 江雨仙 T7 steel blades and its intensifying method
CN109773437A (en) * 2019-03-26 2019-05-21 丹阳市丹鹰工具制造有限公司 A kind of processing technology of drill
CN110369979A (en) * 2019-08-19 2019-10-25 丹阳河工工具有限公司 A kind of processing technology of anti-breaking type screw tap
CN111673403A (en) * 2020-05-29 2020-09-18 贵州泰和超硬工具股份有限公司 Hard alloy twist drill rod grinding process
CN112846315A (en) * 2020-12-31 2021-05-28 苏州用朴精密科技有限公司 Hard alloy drill bit and machining process thereof

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Open date: 20100224