CN103909310B - Screw tap - Google Patents

Screw tap Download PDF

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Publication number
CN103909310B
CN103909310B CN201410137607.4A CN201410137607A CN103909310B CN 103909310 B CN103909310 B CN 103909310B CN 201410137607 A CN201410137607 A CN 201410137607A CN 103909310 B CN103909310 B CN 103909310B
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China
Prior art keywords
blade
screw tap
cutting
shank
screw
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CN201410137607.4A
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Chinese (zh)
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CN103909310A (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
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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 to a kind of screw tap.
Background technology
In the industries such as space flight and aviation, universal machine, chemical industry, armarium, the energy, the numerous parts high-strength materials such as rustless steel acidproof, alkaline-resisting, corrosion resistant, titanium or titanium alloy are made.The feature of this kind of high-strength material is that intensity is high, toughness is big, and there is bigger viscosity, will on these difficult-to-machine materials thread mill drilling, universal straight slot screw tap that the past is traditional is the most inapplicable, it is necessary to use the spiral fluted tap of particular design could solve the processing problems on these materials.Such as Chinese patent literature data discloses a kind of processing stainless steel aperture fine thread high accuracy special screw tap [application number: 201020261322.9;Authorization Notice No.: CN201755703U], it includes 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 makes Mohs vertebral body, cutting portion is by correcting tooth, cutting tooth and front cutting tooth composition, correction tooth one end is connected with caudal peduncle, the correction tooth other end is connected with cutting tooth one end, the cutting tooth other end is connected with front cutting tooth one end, the front cutting tooth other end is connected with guide post, cutting portion lieutenant colonel's commutating tooth, the anterior angle of cutting tooth and front cutting tooth makes 15 degree to 25 degree, seamed edge makes 0 degree, relief angle makes 1 degree to 2 degree, cutting edge inclination makes 30 degree.
Above-mentioned screw tap is applicable to processing stainless steel aperture, but in reality is processed, still suffers from problems with: 1, owing to the blocking of chip is little plus the anti-disconnected moment of torsion of minor diameter screw tap itself, screw tap is easily broken off;2, block due to chip, tapping torque is greatly increased, often cannot once attack on earth, and attack again after having to exit screw tap removing chip, will the most repeatedly when the material that processing intensity is high, tapping efficiency is the lowest, cannot ensure machining accuracy simultaneously, processes to the high-volume of the part of this material and causes the biggest difficulty;3, it is bonded between cutting edge and chip pocket and processed screw due to chip, (screw surface roughness is poor to make processed screw thread with low quality, screw thread " rotten tooth "), have to often sharpen and exchange new screw tap in order to avoid this situation, shortening life of tap, this situation is relatively conventional when processing the material such as cast aluminium, soft copper.
Other screw tap existing is at processing diameter (also there is kindred circumstances during certain major diameter) deep thread hole, blind hole or the screw with groove breach of minor diameter below 16 millimeters, toughness and the ductility of machined material are preferable, such as rustless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy etc., also can run into the problems referred to above.
Summary of the invention
It is an object of the invention to for the above-mentioned problems in the prior art, it is provided that one is applicable to rustless steel, rustless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy processing, and the screw tap that cutting effect is good.
The purpose of the present invention can be realized by following technical proposal: a kind of screw tap, including shank and the blade of structure integrated with 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 three road circumference cutting slots that are equally distributed and that be connected with described thread groove, described cutting slot is made up of the circular arc of three sections of arranged clockwise and by these three sections of the most named R1 of circular arc, R2 and R3, R1:R2:R3 is 2.1-2.3:0.85-1.05:3.9-4.1, described anterior angle y at cutting slot R1 is 14 degree to 16 degree.
Use above-mentioned setting, this screw tap is applicable to machined material preferable to toughness and ductility (material such as such as rustless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) and carries out deep thread hole, blind hole or the processing of the screw with groove breach, the setting of R1, R2, R3 and anterior angle y makes blade cutting effect good, and make between blade and processed screw, to be difficult to the chip that bonds, make the Quality advance of processed screw thread, and improve life of tap.
In above-mentioned a kind of screw tap, helical angle w of described thread groove is 75 degree.So chip removal is smooth smoothly.
In above-mentioned a kind of screw tap, the heart thickness diameter D of described blade deducts the outside diameter d of blade again equal to vertical dimension M of 2 times of R2 points of tangency to blade side face in opposite directions.Above-mentioned formula is D=2M-d, such reasonable in design, and resistance to torsion is good, and this screw tap is long for service life.
In above-mentioned a kind of screw tap, the heart thickness diameter D of described blade tends to shank direction in the 0 ° of 45 ' gradient increased.Which increasing the resistance to torsion of this screw tap, service life is long.
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 work piece easily cut by this sample screw tap, cuts sharp.
In above-mentioned a kind of screw tap, described shank and blade use high-speed tool steel to make.So wearability is good, intensity is high, service life is long, it is adaptable to High-speed machining.
Compared with prior art, this screw tap is applicable to machined material preferable to toughness and ductility (material such as such as rustless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) and carries out deep thread hole, blind hole or the processing of the screw with groove breach, also have the advantage that 1, chip removal unobstructed, therefore tapping torque is greatly reduced, generally can once attack on earth, improve production efficiency;2, cut sharp, therefore be difficult between cutting edge and chip pocket and processed screw bond chip so that the Quality advance (screw surface roughness is good, and screw thread " rotten tooth " situation is avoided) of processed screw thread, improve life of tap;3, for the rustless steel acidproof, alkaline-resisting, corrosion resistant in the industries such as space flight and aviation, universal machine, chemical industry, armarium, the energy and the processing of the high-strength material such as titanium and titanium alloy, solve over traditional inapplicable state of universal straight slot screw tap, have obvious advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of this screw tap.
Fig. 2 be this screw tap look up structural representation.
In figure, 1, shank;2, blade;3, thread groove;4, cutting slot;5, cutting edge.
Detailed description of the invention
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described, but the present invention is not limited to these embodiments.
As shown in Figure 1 and Figure 2, this screw tap includes shank 1 and the blade 2 of structure integrated with shank 1, shank 1 and blade 2 all use 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 three road circumference cutting slots 4 that are equally distributed and that be connected with described thread groove 3, cutting slot 4 is made up of the circular arc of three sections of arranged clockwise and by these three sections of circular arcs the most named R1, R2 and R3, R1:R2:R3 is 2.1-2.3:0.85-1.05:3.9-4.1, and anterior angle y at cutting slot 4R1 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.
Describing in detail further, in order to chip removal is smooth smoothly, helical angle w of thread groove 3 is 75 degree;In order to resistance to torsion is good, service life is long, the heart thickness diameter D of blade 2 deducts the outside diameter d of blade 2 again equal to vertical dimension M of 2 times of R2 points of tangency to blade 2 side face in opposite directions, formula is D=2M-d, and the heart thickness diameter D of blade 2 tends to shank 1 direction in the 0 ° of 45 ' gradient increased.
Use above-mentioned setting, this screw tap is applicable to machined material preferable to toughness and ductility (material such as such as rustless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) and carries out deep thread hole, blind hole or the processing of the screw with groove breach, the setting of R1, R2, R3 and anterior angle y makes blade 2 cutting effect good, and make between blade 2 and processed screw, to be difficult to the chip that bonds, make the Quality advance of processed screw thread, and improve 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 is equal to 1.3 tooth depths (tooth depth of the thread of work piece).
This screw tap is applicable to machined material preferable to toughness and ductility (material such as such as rustless steel, structural alloy steel, chromium steel, soft copper, aluminium alloy) and carries out deep thread hole, blind hole or the processing of the screw with groove breach, solve over traditional inapplicable state of universal straight slot screw tap, have obvious advantage.
Specific embodiment described herein is only to present invention spirit explanation for example.Described specific embodiment can be made various amendment or supplements or use similar mode to substitute by those skilled in the art, but without departing from the spirit of the present invention or surmount scope defined in appended claims.
Although the most more employing the terms such as shank 1, blade 2, thread groove 3, cutting slot 4, cutting edge 5, but it is not precluded from using the probability of other term.Use these terms to be only used to more easily to describe and explain the essence of the present invention;It is all contrary with spirit of the present invention for being construed as any additional restriction.

Claims (6)

1. a screw tap, including shank (1) and with the blade (2) of shank (1) integrated structure, 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 three road circumference cutting slots (4) that are equally distributed and that be connected with described thread groove (3), described cutting slot (4) is made up of the circular arc of three sections of arranged clockwise and by these three sections of the most named R1 of circular arc, R2 and R3, R1:R2:R3 is 2.1-2.3:0.85-1.05:3.9-4.1, described anterior angle y at cutting slot (4) R1 is 14 degree to 16 degree.
A kind of screw tap the most according to claim 1, it is characterised in that helical angle w of described thread groove (3) is 75 degree.
A kind of screw tap the most according to claim 1, it is characterised in that the heart thickness diameter D of described blade (2) deducts the outside diameter d of blade (2) again equal to vertical dimension M of 2 times of R2 points of tangency to blade (2) side face in opposite directions.
A kind of screw tap the most according to claim 3, it is characterised in that the heart thickness diameter D of described blade (2) tends to shank (1) direction in the 0 ° of 45 ' gradient increased.
5., according to a kind of screw tap described in claim 1 or 2 or 3 or 4, it is characterised in that the incision bottom periphery of described blade (2) has the cutting edge (5) of axial extension, the length of described cutting edge (5) is more than or equal to 1.3 tooth depths.
A kind of screw tap the most according to claim 1, it is characterised in that described shank (1) and blade (2) use 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

Publications (2)

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

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Families Citing this family (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

Family Cites Families (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
WO2008075402A1 (en) * 2006-12-18 2008-06-26 Osg Corporation 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

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