CN103909310A - Screw tap - Google Patents

Screw tap Download PDF

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Publication number
CN103909310A
CN103909310A CN201410137607.4A CN201410137607A CN103909310A CN 103909310 A CN103909310 A CN 103909310A CN 201410137607 A CN201410137607 A CN 201410137607A CN 103909310 A CN103909310 A CN 103909310A
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CN
China
Prior art keywords
blade
screw tap
shank
cutting
screw
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Granted
Application number
CN201410137607.4A
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Chinese (zh)
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CN103909310B (en
Inventor
陈鹏宇
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ZHEJIANG MEKOL TOOLS CO Ltd
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ZHEJIANG MEKOL TOOLS CO Ltd
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Priority to CN201410137607.4A priority Critical patent/CN103909310B/en
Publication of CN103909310A publication Critical patent/CN103909310A/en
Application granted granted Critical
Publication of CN103909310B publication Critical patent/CN103909310B/en
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Abstract

The invention provides a screw tap, belongs to the technical field of tools and solves the problem that an existing screw tap is inapplicable to processing high-strength materials like stainless steel. The screw tap comprises a handle portion and a blade portion, wherein the handle portion and the blade portion are in an integral structure, the tail end of the handle portion is shaped in a square shape, the blade portion is provided with a threaded groove, three cutting grooves communicated with the threaded groove are uniformly distributed on the cut-over bottom face of the blade portion, each cutting groove is formed by combination of three clockwise arranged arcs named R1, R2 and R3, R1: R2: R3 is 2.1-2.3:0.85-1.05:3.9-4.1, a front angle y at the position of the cutting groove R1 ranges from 14 to 16 degrees. The screw tap is applicable to processing high-strength materials like stainless steel, good in cutting effect, long in service life and the like.

Description

A kind of screw tap
Technical field
The invention belongs to process tool technical field, relate to a kind of boring bar tool, particularly a kind of screw tap.
Background technology
In the industries such as space flight and aviation, universal machine, chemical industry, Medical Devices, the energy, for numerous parts, the high-strength material such as acidproof, alkaline-resisting, corrosion resistant stainless steel, titanium or titanium alloy is made.The feature of this class high-strength material is that intensity is high, toughness is large, and there is larger viscosity, will be on these difficult-to-machine materials thread mill drilling, the universal straight trough screw tap that the past is traditional is also inapplicable, must adopt the spiral fluted tap of particular design could solve the processing problems on these materials.For example Chinese patent literature data discloses a kind of processing stainless steel aperture fine thread high accuracy special screw tap [application number: 201020261322.9, Granted publication number: CN201755703U], it comprises caudal peduncle, cutting portion and guide post, cutting portion is connected with caudal peduncle, the cutting portion other end is connected with guide post, the caudal peduncle other end is made Mohs centrum, cutting portion is by proofreading and correct tooth, cutting teeth and front cutting teeth composition, proofreading and correct tooth one end is connected with caudal peduncle, proofreading and correct the tooth other end is connected with cutting teeth one end, the cutting teeth other end is connected with front cutting teeth one end, the front cutting teeth other end is connected with guide post, cutting portion lieutenant colonel commutating tooth, the anterior angle of cutting teeth and front cutting teeth is made 15 degree to 25 degree, seamed edge is made 0 degree, relief angle is made 1 degree to 2 degree, cutting edge inclination is made 30 degree.
Above-mentioned screw tap is applicable to processing stainless steel aperture, but in reality processing, still has following problem: 1,, because the obstruction of smear metal adds that the anti-disconnected moment of torsion of minor diameter screw tap itself is little, screw tap easily ruptures; 2, because smear metal is blocked, tapping moment of torsion increases greatly, often cannot once attack on earth, and the screw tap of being obliged to retreat is attacked after removing smear metal again, will be repeatedly repeatedly in the time of the high material of processing intensity, tapping efficiency is very low, cannot guarantee machining accuracy simultaneously, causes very large difficulty to the processing in enormous quantities of the part of this material; 3, because smear metal is bonded between cutting edge and chip pocket and processed screw, (screw surface roughness is poor to make processed screw thread with low quality, screw thread " rotten tooth "), have to for fear of this situation frequent sharpening and exchange new screw tap, shortened life of tap, this situation is comparatively common in the time of the materials such as processing cast aluminium, soft copper.
Existing other screw tap is at (also having kindred circumstances when certain major diameter) deep thread hole, blind hole or the screw with groove breach of processing diameter minor diameter below 16 millimeters, toughness and the ductility of machined material are better, such as stainless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy etc., also can run into the problems referred to above.
Summary of the invention
The object of the invention is for the above-mentioned problems in the prior art, provide one to be applicable to stainless steel, stainless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy processing, and the good screw tap of cutting effect.
Object of the present invention can realize by following technical proposal: a kind of screw tap, comprise shank and the blade with the integral formula structure of shank, described shank end is square tail shape, described blade offers thread groove, it is characterized in that, the incision bottom surface of described blade offers circumferentially cutting slot equally distributed and that be connected with described thread groove of three roads, described cutting slot is made up of the circular arc of three sections of arranged clockwise and by these three sections of circular arcs called after R1 successively, R2 and R3, R1:R2:R3 is 2.1-2.3:0.85-1.05:3.9-4.1, the anterior angle y at described cutting slot R1 place is 14 degree to 16 degree.
Adopt above-mentioned setting, this screw tap is applicable to toughness and the good machined material of ductility (materials such as stainless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) to carry out deep thread hole, blind hole or the processing with the screw of groove breach, R1, R2, R3 and anterior angle y are arranged so that blade cutting effect is good, and make between blade and processed screw to be difficult for bonding smear metal, the quality of processed screw thread is improved, and improved life of tap.
In above-mentioned a kind of screw tap, the helical angle w of described thread groove is 75 degree.Chip removal is smoothly smooth like this.
In above-mentioned a kind of screw tap, the thick diameter D of the heart of described blade equals 2 times of R2 points of tangency and deducts to the vertical range M of blade side face in opposite directions again the outside diameter d of blade.Above-mentioned formula is D=2M-d, reasonable in design like this, and resistance to torsion is good, this screw tap long service life.
In above-mentioned a kind of screw tap, the thick diameter D trend of the heart of described blade shank direction is 0 ° of 45 ' gradient of increase.Increase like this resistance to torsion of this screw tap, long service life.
In above-mentioned a kind of screw tap, the incision bottom periphery of described blade has the cutting edge of axial extension, and the length of described cutting edge is more than or equal to 1.3 tooth depths.Tooth depth is the tooth depth of the thread of work piece, and this sample screw tap is easily cut work piece, cuts sharp.
In above-mentioned a kind of screw tap, described shank and blade adopt high-speed tool steel to make.Wearability is good like this, intensity is high, long service life, is applicable to High-speed machining.
Compared with prior art, this screw tap is applicable to toughness and the good machined material of ductility (materials such as stainless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) to carry out deep thread hole, blind hole or the processing with the screw of groove breach, also have the following advantages: 1, chip removal is unobstructed, therefore tapping moment of torsion reduces greatly, conventionally can once attack on earth, enhance productivity; 2, cut sharp, therefore between cutting edge and chip pocket and processed screw be difficult for bonding smear metal, make processed screw thread quality improve (screw surface roughness is good, and screw thread " rotten tooth " situation is avoided), improved life of tap; 3, for the processing of the high-strength material such as acidproof, alkaline-resisting, corrosion resistant stainless steel and titanium and titanium alloy in the industries such as space flight and aviation, universal machine, chemical industry, Medical Devices, the energy, solve in the past traditional inapplicable state of universal straight trough screw tap, had obvious advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of this screw tap.
Fig. 2 is the structural representation of looking up of this screw tap.
In figure, 1, shank; 2, blade; 3, thread groove; 4, cutting slot; 5, cutting edge.
The specific embodiment
Be below specific embodiments of the invention by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiment.
As shown in Figure 1 and Figure 2, this screw tap comprises shank 1 and the blade 2 with the integral formula structure of shank 1, shank 1 and blade 2 all adopt high-speed tool steel to make, shank 1 end is square tail shape, blade 2 offers thread groove 3, the incision bottom surface of blade 2 offers circumferentially cutting slot 4 equally distributed and that be connected with described thread groove 3 of three roads, cutting slot 4 is made up of the circular arc of three sections of arranged clockwise and by these three sections of circular arcs called after R1, R2 and R3 successively, R1:R2:R3 is 2.1-2.3:0.85-1.05:3.9-4.1, and the anterior angle y at cutting slot 4R1 place is 14 degree to 16 degree.In the present embodiment, R1:R2:R3 is 2.0:0.95:4.0, and anterior angle y is 14 degree.
Further describe in detail, smoothly smooth for chip removal, the helical angle w of thread groove 3 is 75 degree; For resistance to torsion is good, long service life, the thick diameter D of the heart of blade 2 equals 2 times of R2 points of tangency and deducts to the vertical range M of blade 2 side faces in opposite directions again the outside diameter d of blade 2, formula is D=2M-d, and the thick diameter D trend of heart shank 1 direction of blade 2 is 0 ° of 45 ' gradient of increase.
Adopt above-mentioned setting, this screw tap is applicable to toughness and the good machined material of ductility (materials such as stainless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) to carry out deep thread hole, blind hole or the processing with the screw of groove breach, R1, R2, R3 and anterior angle y are arranged so that blade 2 cutting effects are good, and make between blade 2 and processed screw to be difficult for bonding smear metal, the quality of processed screw thread is improved, and improved life of tap; For the ease of incision work piece, the incision bottom periphery of blade 2 has the cutting edge 5 of axial extension, and the length of cutting edge 5 is more than or equal to 1.3 tooth depths, and in the present embodiment, the length of cutting edge 5 equals 1.3 tooth depths (tooth depth of the thread of work piece).
This screw tap is applicable to toughness and the good machined material of ductility (materials such as stainless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) to carry out deep thread hole, blind hole or the processing with the screw of groove breach, solve in the past traditional inapplicable state of universal straight trough screw tap, had obvious advantage.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although more used the terms such as shank 1, blade 2, thread groove 3, cutting slot 4, cutting edge 5 herein, do not got rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present invention; They are construed to any additional restriction is all contrary with spirit of the present invention.

Claims (6)

1. a screw tap, comprise shank (1) and the blade (2) with the integral formula structure of shank (1), described shank (1) end is square tail shape, described blade (2) offers thread groove (3), it is characterized in that, the incision bottom surface of described blade (2) offers circumferentially cutting slot (4) equally distributed and that be connected with described thread groove (3) of three roads, described cutting slot (4) is made up of the circular arc of three sections of arranged clockwise and by these three sections of circular arcs called after R1 successively, R2 and R3, R1:R2:R3 is 2.1-2.3:0.85-1.05:3.9-4.1, the anterior angle y at described cutting slot (4) R1 place is 14 degree to 16 degree.
2. a kind of screw tap according to claim 1, is characterized in that, the helical angle w of described thread groove (3) is 75 degree.
3. a kind of screw tap according to claim 1, is characterized in that, the thick diameter D of the heart of described blade (2) equals 2 times of R2 points of tangency and deduct to the vertical range M of blade (2) side face in opposite directions again the outside diameter d of blade (2).
4. a kind of screw tap according to claim 3, is characterized in that, the thick diameter D trend of heart shank (1) direction of described blade (2) is 0 ° of 45 ' gradient of increase.
5. according to a kind of screw tap described in claim 1 or 2 or 3 or 4, it is characterized in that, the incision bottom periphery of described blade (2) has the cutting edge (5) of axial extension, and the length of described cutting edge (5) is more than or equal to 1.3 tooth depths.
6. a kind of screw tap according to claim 1, is characterized in that, described shank (1) and blade (2) adopt high-speed tool steel to make.
CN201410137607.4A 2014-04-08 2014-04-08 Screw tap Active CN103909310B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410137607.4A CN103909310B (en) 2014-04-08 2014-04-08 Screw tap

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410137607.4A CN103909310B (en) 2014-04-08 2014-04-08 Screw tap

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CN103909310A true CN103909310A (en) 2014-07-09
CN103909310B CN103909310B (en) 2017-01-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106475606A (en) * 2016-12-23 2017-03-08 平湖市山特螺纹工具有限公司 A kind of rustless steel screw tap
CN106563855A (en) * 2016-11-11 2017-04-19 丹阳宝联五金制品有限公司 Screw tap with high machining efficiency

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2202606Y (en) * 1994-10-14 1995-07-05 汲伟民 Oblique edge tap
CN2843705Y (en) * 2005-12-05 2006-12-06 陈�胜 Spiral screw
WO2008149465A1 (en) * 2007-06-08 2008-12-11 Osg Corporation Tap covered with hard coating, and process for manufacturing the same
CN201253719Y (en) * 2008-08-13 2009-06-10 吴秀峰 Heavy cutting tap
CN101563180A (en) * 2006-12-18 2009-10-21 Osg株式会社 Spiral tap
CN203765115U (en) * 2014-04-08 2014-08-13 浙江美克工具有限公司 Screw tap

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2202606Y (en) * 1994-10-14 1995-07-05 汲伟民 Oblique edge tap
CN2843705Y (en) * 2005-12-05 2006-12-06 陈�胜 Spiral screw
CN101563180A (en) * 2006-12-18 2009-10-21 Osg株式会社 Spiral tap
WO2008149465A1 (en) * 2007-06-08 2008-12-11 Osg Corporation Tap covered with hard coating, and process for manufacturing the same
CN201253719Y (en) * 2008-08-13 2009-06-10 吴秀峰 Heavy cutting tap
CN203765115U (en) * 2014-04-08 2014-08-13 浙江美克工具有限公司 Screw tap

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106563855A (en) * 2016-11-11 2017-04-19 丹阳宝联五金制品有限公司 Screw tap with high machining efficiency
CN106475606A (en) * 2016-12-23 2017-03-08 平湖市山特螺纹工具有限公司 A kind of rustless steel screw tap

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