CN102145400A - Twist drill with changeable helical angles - Google Patents
Twist drill with changeable helical angles Download PDFInfo
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- CN102145400A CN102145400A CN 201110106771 CN201110106771A CN102145400A CN 102145400 A CN102145400 A CN 102145400A CN 201110106771 CN201110106771 CN 201110106771 CN 201110106771 A CN201110106771 A CN 201110106771A CN 102145400 A CN102145400 A CN 102145400A
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- helical angle
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- apex point
- active section
- fluted drill
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Abstract
The invention relates to a twist drill with changeable helical angles, belonging to a metal cutting tool technology. The twist drill comprises a handle part and a working segment, wherein the working segment is provided with a double-helical groove divided into a front segment near a drill point and a rear segment near the handle part, the helical angle of the front segment is 35-38 DEG, the helical angle of the rear segment is 15-17 DEG, and the front segment and the rear segment are in smooth transition. The twist drill provided by the invention better gives consideration to cutting and chip removing processes, and has the advantages of long service life, stability in drilling and high drilling quality.
Description
Technical field
The invention belongs to the metal cutting tool technology, relate to a kind of fluted drill that changes helical angle.
Background technology
The fluted drill of standard is made of shank and active section, its active section is provided with double-helical groove, the helical angle of its spiral grooves is a fixed value, if it is using the excessive then chip removal difficulty of helical angle, the machinability of the too small then cutting edge of helical angle is relatively poor, existing standard fluted drill helical angle about 30 °, is difficult to take into account chip removal and cutting usually, finally all can cause drilling life of bit to descend.
Summary of the invention
Technical problem to be solved by this invention is, provides that a kind of cutting and chip removal to fluted drill takes into account better, the fluted drill of long service life, borehole stability, variation helical angle that drilling quality is high.
The fluted drill of variation helical angle of the present invention includes shank and active section, active section has the double helix groove, described double helix groove is divided near the leading portion of apex point with near these two parts of shank back segment, the helical angle of its leading portion is 35 °~38 °, the back segment helical angle is 15 °~17 °, and front and back seamlessly transit for two sections.
Segment length accounts for 10%~20% of active section total length before described.
Described apex point makes the core of apex point part thick thick less than other part cores by the cross reconditioning, and making the chisel edge anterior angle simultaneously is+3 °~+ 8 °.
Described active section leading portion has the part of one section diameter less than nominal diameter near apex point, forms ladder-type structure in the end.
Advantage of the present invention is:
1, the drill bit active section adopts the large helix angle groove near cutting tip, makes drill bit main cutting edge anterior angle increase, and cutting edge is more sharp; Partly adopt the low pitch angle groove near shank, make the boring chip removal smooth more; Improved overall performance;
2, cutting tip is the stairstepping of size diameter, during on the one hand for product boring incision, has reduced cutting force, has improved processing stability, on the other hand also for the ladder pass need, provide may and conveniently;
3, apex point cross reconditioning, reduced apex point core thick (being chisel edge length), increased chisel edge anterior angle (-50 °~-60 ° become+3 °~+ 8 °), become the shovel cutting by squeezing cutting by the working angles that makes chisel edge by standard, can reduce heat in metal cutting, reduce the apex point wearing and tearing; Reduce the axial compressive force (≈ 50%) of boring, bore square (≈ 30%), make drilling brisk.Because chisel edge shortens, help boring centering simultaneously, can obviously reduce the hole wall surface roughness, improve shape, the positional precision in aperture and hole.
4, through actual tests, under conditions such as identical cutting data and rapidoprint, relative standard's fluted drill, the present invention can improve 2~5 times of drilling life of bit.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention;
Fig. 2 is the enlarged diagram of apex point part of the present invention, and its projecting direction is the length direction of apex point chisel edge.
The specific embodiment
The invention will be further described below in conjunction with embodiment and contrast test.
Embodiment one
With the high-speed steel bar of same production batch W6Mo5Cr4V2, Ф 10.80, produce Ф 10 specification fluted drill A samples and B sample (both Technologies for Heating Processing are identical), the A sample is existing standard fluted drill, and the B sample is a fluted drill of the present invention, and concrete parameter is as follows:
A sample: length overall L=133mm, active section length L 1=87mm, 30 ° of active section helical angles, diameter d=10mm, the thick 1.6mm of apex point core, chisel edge anterior angle γ=-52 °;
B sample: length overall L=133mm, active section length L 1=87mm, active section leading portion length L 2=15mm, 1=37 ° of leading portion helical angle ω, 2=16 ° of back segment helical angle ω, diameter d=10mm, near apex point step portion minor diameter d1=6.8mm, the thick 0.15mm of apex point core, chisel edge anterior angle γ=5 °.
Test method: with TK7640 type digital control vertical boring and milling machine, cutting speed: 28m/min, amount of feeding 0.25mm/r, drilling degree of depth 30mm.Cutting examination base: 40Cr Ф 350*40 modifier treatment, hardness HB208~212.The drilling blind hole is with the cooling of the oil emulsion aqueous solution.Its function life-span result of the test sees Table 1, table 2.
Table 1(B sample test specimen boring result)
1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# | Add up to | Average |
363 | 391 | 489 | 471 | 369 | 380 | 512 | 575 | 269 | 498 | 4317 | ? |
Table 2(A sample test specimen boring result)
1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# | Add up to | Average |
144 | 130 | 125 | 168 | 143 | 138 | 99 | 145 | 102 | 135 | 1329 | ? |
Embodiment two
With the high-speed steel bar of same production batch W9Mo3Cr4V, Ф 6.6, produce Ф 6.0 specification straight shank twist drill A samples and B sample (Technology for Heating Processing is identical), the A sample is existing standard fluted drill, and the B sample is a fluted drill of the present invention, and concrete parameter is as follows:
A sample: length overall L=101mm, active section length L 1=63mm, 30 ° of active section helical angles, diameter d=6mm, the thick 1.05mm of apex point core, chisel edge anterior angle γ=-53 °;
B sample: length overall L=101mm, active section length L 1=63mm, active section leading portion length L 2=10mm, 1=36 ° of leading portion helical angle ω, 2=16 ° of back segment helical angle ω, diameter d=6mm, near apex point step portion minor diameter d1=4.2mm, the thick 0.12mm of apex point core, chisel edge anterior angle γ=4 °.
Test method: with TK7640 type digital control vertical boring and milling machine, cutting speed: 28m/min, amount of feeding 0.17mm/r, drilling degree of depth 20mm.Cutting examination base: 40Cr Ф 300*30 modifier treatment, hardness HB212~218.The drilling blind hole is with the cooling of the oil emulsion aqueous solution.Its result of the test sees Table 3, table 4.
Table 3(B sample test specimen boring result)
1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# | Add up to | Average |
945 | 1102 | 1339 | 1543 | 1553 | 1745 | 1335 | 1162 | 1039 | 959 | 12722 | ? |
Table 4(A sample test specimen boring result)
1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# | Add up to | Average |
401 | 458 | 366 | 383 | 372 | 443 | 279 | 380 | 497 | 477 | 4056 | ? |
Claims (4)
1. fluted drill that changes helical angle, include shank and active section, active section has the double helix groove, it is characterized in that: described double helix groove is divided near the leading portion of apex point with near these two parts of shank back segment, the helical angle of its leading portion is 35 °~38 °, the back segment helical angle is 15 °~17 °, and front and back seamlessly transit for two sections.
2. the fluted drill of variation helical angle according to claim 1 is characterized in that: segment length accounts for 10%~20% of active section total length before described.
3. the fluted drill of variation helical angle according to claim 1 and 2 is characterized in that: apex point makes the core of apex point part thick thick less than other part cores by the cross reconditioning, and making the chisel edge anterior angle simultaneously is+3 °~+ 8 °.
4. the fluted drill of variation helical angle according to claim 1 and 2 is characterized in that: described active section leading portion has the part of one section diameter less than nominal diameter near apex point, forms ladder-type structure in the end.
Priority Applications (1)
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CN 201110106771 CN102145400A (en) | 2011-04-27 | 2011-04-27 | Twist drill with changeable helical angles |
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CN 201110106771 CN102145400A (en) | 2011-04-27 | 2011-04-27 | Twist drill with changeable helical angles |
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CN 201110106771 Pending CN102145400A (en) | 2011-04-27 | 2011-04-27 | Twist drill with changeable helical angles |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102974871A (en) * | 2012-11-27 | 2013-03-20 | 深圳市金洲精工科技股份有限公司 | Substrate for processing cutter and manufacturing method of substrate and drill bit using substrate |
CN104551122A (en) * | 2014-12-30 | 2015-04-29 | 苏州欧美克合金工具有限公司 | Twist drill with variable apex angle |
CN106141258A (en) * | 2016-08-17 | 2016-11-23 | 江苏飞达钻头股份有限公司 | Stepped core thickness fluted drill and manufacture method thereof |
CN108161081A (en) * | 2018-01-19 | 2018-06-15 | 苏州阿诺精密切削技术有限公司 | For the drill bit to the metal works Drilling operation with cementation zone |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3545586A1 (en) * | 1985-12-21 | 1987-07-02 | Komet Stahlhalter Werkzeug | Drilling tool |
US6652203B1 (en) * | 2002-08-30 | 2003-11-25 | Credo Technology Corporation | Precision drill bits |
DE102006032005A1 (en) * | 2006-07-10 | 2008-01-17 | EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Material processing tool e.g. shaft tool, has working area, which is rotatable around tool axis, and grooves running around tool axis, where angle of twist of grooves changes along tool axis in sections |
CN101342605A (en) * | 2007-07-12 | 2009-01-14 | 本田技研工业株式会社 | Drill |
CN202079312U (en) * | 2011-04-27 | 2011-12-21 | 江苏飞达钻头股份有限公司 | Spiral drill with changed spiral angles |
-
2011
- 2011-04-27 CN CN 201110106771 patent/CN102145400A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3545586A1 (en) * | 1985-12-21 | 1987-07-02 | Komet Stahlhalter Werkzeug | Drilling tool |
US6652203B1 (en) * | 2002-08-30 | 2003-11-25 | Credo Technology Corporation | Precision drill bits |
DE102006032005A1 (en) * | 2006-07-10 | 2008-01-17 | EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Material processing tool e.g. shaft tool, has working area, which is rotatable around tool axis, and grooves running around tool axis, where angle of twist of grooves changes along tool axis in sections |
CN101342605A (en) * | 2007-07-12 | 2009-01-14 | 本田技研工业株式会社 | Drill |
CN202079312U (en) * | 2011-04-27 | 2011-12-21 | 江苏飞达钻头股份有限公司 | Spiral drill with changed spiral angles |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102974871A (en) * | 2012-11-27 | 2013-03-20 | 深圳市金洲精工科技股份有限公司 | Substrate for processing cutter and manufacturing method of substrate and drill bit using substrate |
CN104551122A (en) * | 2014-12-30 | 2015-04-29 | 苏州欧美克合金工具有限公司 | Twist drill with variable apex angle |
CN106141258A (en) * | 2016-08-17 | 2016-11-23 | 江苏飞达钻头股份有限公司 | Stepped core thickness fluted drill and manufacture method thereof |
CN108161081A (en) * | 2018-01-19 | 2018-06-15 | 苏州阿诺精密切削技术有限公司 | For the drill bit to the metal works Drilling operation with cementation zone |
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Application publication date: 20110810 |