CN103934520B - A kind of Contoured squeeze screw tap with many faceted pebbles - Google Patents
A kind of Contoured squeeze screw tap with many faceted pebbles Download PDFInfo
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- CN103934520B CN103934520B CN201310018835.5A CN201310018835A CN103934520B CN 103934520 B CN103934520 B CN 103934520B CN 201310018835 A CN201310018835 A CN 201310018835A CN 103934520 B CN103934520 B CN 103934520B
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- contoured squeeze
- screw tap
- faceted pebbles
- many faceted
- forming portion
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Abstract
The invention discloses a kind of Contoured squeeze screw tap with many faceted pebbles, comprise shank and be at least provided with the thread forming portion of a forming thread, described thread forming portion comprises extruding tapering, corrects press section and two or more lubrication groove, and described thread forming portion is at least provided with two Contoured squeeze ribs between adjacent two lubrication grooves.This Contoured squeeze screw tap with many faceted pebbles has that intensity is high, antiwear property is strong, the advantage of long service life.
Description
Technical field
The present invention relates to screw thread process technology, particularly relate to a kind of Contoured squeeze screw tap with many faceted pebbles.
Background technology
Cut tap tapping belongs to more difficult manufacturing procedure, because screw tap is almost be embedded in workpiece to cut, the machining load of its each tooth is larger than other cutters, and screw tap along screw thread and work piece interface very large, also to hold during screw cutting and scrap fallaway, therefore, can say that screw tap works under very arduous test conditions.
Thread forming tap is mainly used for carrying out a kind of screw tap of chipless machining internal thread, compared with traditional cut tap, thread forming tap does not need to produce chip, but utilize the plastic deformation of workpiece material to extrude screw thread, this process does not produce chip, thus does not also cut off the crystalline phase fibre structure of workpiece material; Thread forming tap adds the moment of torsion that man-hour requirement provides larger than cut tap processing, and its moment of torsion is about 1 ~ 1.5 times of cut tap.
Thread forming tap is mainly applicable to the steel of percentage elongation δ >=10%, stainless steel, non-ferrous metal and the internal thread through hole of Si content≤10% alusil alloy or the extrusion process of blind hole.According to DIN8583 standard, thread-rolling screw refers to that being threaded through pressure clamp-ons and occupy certain space within the workpiece among workpiece and form screw thread.That is, the polygonal profile of thread forming tap, under invariable feed rate, by the guiding of crush cones, screw in gradually in the thread Pilot hole on workpiece, thereupon, workpiece material transfers plastic deformation to by elastic deformation.Because workpiece material has ductility, along with material radial dilatation, metal material, along there being the profile of screw-tap threaded to flow in screw-tap threaded gap, finally forms path and the tooth form of internal thread.The diameter of thread forming tap thread Pilot hole is before processing large, after processing, bottom outlet can diminish, and after crush cones enters endoporus completely, follow-up correction tooth screws along the direction that crush cones processes and enters, tightly combine with processed internal thread, guide effect is played to screw tap processing; But when crush cones has just entered or do not entered completely, overhang more than 20 × D at cutter especially, or under being added with extension bar operating mode, cutter amount of deflection is very large, when crush cones clamp-ons thread Pilot hole, screw tap is easy to cause tapping eccentric by radial load, and cause screw tap to process moment of torsion and increase, cutter very easily fractures.In order to reduce per tooth load, improve cutter life and processed screw thread fineness, thread forming tap is designed with the number of teeth more more than cut tap usually; Enter processing district to make cooling fluid and prevent the cooling fluid when processing blind hole from blocking in bottom, general all with oil-way on thread forming tap; The number of teeth of thread forming tap is more, and number of groves is more, and actual effective cross-sectional area rate reduces, and cutter rigidity declines.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, provides that a kind of intensity is high, antiwear property is strong, the Contoured squeeze screw tap with many faceted pebbles of long service life.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of Contoured squeeze screw tap with many faceted pebbles, comprise shank and be at least provided with the thread forming portion of a forming thread, described thread forming portion comprises extruding tapering, corrects press section and two or more lubrication groove, and described thread forming portion is at least provided with two Contoured squeeze ribs between adjacent two lubrication grooves.
N number of Contoured squeeze rib is provided with, 2≤N≤3 between described adjacent two lubrication grooves.
Be provided with 2 Contoured squeeze ribs between described adjacent two lubrication grooves, on the radial section in thread forming portion, the angle of adjacent two Contoured squeeze ribs is α and β, 5 °≤| alpha-beta |≤20 °.
On the radial section in thread forming portion, the minimum angle of described Contoured squeeze rib and lubrication groove is θ, 15 °≤θ≤75 °.
Described Contoured squeeze rib and lubrication groove are linear pattern or spiral line type.
Described two or more lubrication groove is uniformly distributed along cutter outer circumference surface.
Described Contoured squeeze rib forms in extruding tapering and corrects on press section.
Compared with prior art, the invention has the advantages that:
The Contoured squeeze screw tap with many faceted pebbles of the present invention, by establishing multiple Contoured squeeze rib between adjacent two lubrication grooves, make cutter of the present invention while ensuring sufficient lubrication and cooling, 5% ~ 20% is improved than general same specification, thread forming tap effective cross-sectional area of the same type, thus improve tool strength, effective tool life; Meanwhile, the increase of extrusion edge, will reduce per tooth load, improve cutter antiwear property.Contoured squeeze rib have employed the arrangement form of not decile, effectively can suppress screw tap generation chatter, makes cutter have outstanding centering performance, extends cutting-tool's used life, can also improve the quality of processed thread surface simultaneously.
Accompanying drawing explanation
Fig. 1 is main TV structure schematic diagram of the present invention.
Fig. 2 is the A-A cross section view of Fig. 1.
In figure, each label represents:
1, Contoured squeeze rib; 2, space between rib; 3, lubrication groove; 6, tapering is extruded; 7, press section is corrected; 8, shank.
Detailed description of the invention
Fig. 1 and Fig. 2 shows a kind of Contoured squeeze screw tap embodiment with many faceted pebbles of the present invention, the thread forming portion that this Contoured squeeze screw tap with many faceted pebbles comprises shank 8 and is at least provided with a forming thread, thread forming portion comprises extruding tapering 6, correct press section 7 and two or more lubrication groove 3, two or more lubrication groove 3 is uniformly distributed along cutter outer circumference surface, thread forming portion is at least provided with two Contoured squeeze ribs 1 between adjacent two lubrication grooves 3, space 2 between rib is defined between each adjacent Contoured squeeze rib 1, generally, N number of Contoured squeeze rib 1 is provided with between adjacent two lubrication grooves 3, 2≤N≤3, in the present embodiment, N=2, the forming thread in thread forming portion is one, lubrication groove 3 is two.By establishing multiple Contoured squeeze rib 1 between adjacent two lubrication grooves 3, make cutter of the present invention while ensuring sufficient lubrication and cooling, 5% ~ 20% is improved than general same specification, thread forming tap effective cross-sectional area of the same type, actual effective cross-sectional area rate increases (y/x, wherein y is effective cross-sectional area, x is the crosscut area of a circle) thus improve tool strength, effectively extend cutter life; Meanwhile, the increase of Contoured squeeze rib, will reduce per tooth load, improve cutter antiwear property.
Further, on the radial section in thread forming portion, the angle of adjacent two Contoured squeeze ribs 1 is α and β, 5 °≤| alpha-beta |≤20 °, Contoured squeeze rib 1 is θ with the minimum angle of lubrication groove 3,15 °≤θ≤75 °.In the present embodiment, α=85 °, β=95 °, θ=50 °, | alpha-beta |=10 °.Between adjacent two lubrication grooves 3, be provided with 2 Contoured squeeze ribs 1, compare same specification, its effective cross-sectional area of common thread forming tap of the same type improves nearly 12%, screw tap rigidity, intensity obtain significant increase.Simultaneously, adopt not decile shaping extrusion edge 1 angle design, angle α, β between adjacent two Contoured squeeze ribs 1 are unequal, add man-hour each Contoured squeeze rib 1 different from the absorption surface time, and it is very little that the intrinsic frequency between lathe, cutter, fixture produces the probability resonated, and there is the effect suppressing screw tap chatter, screw tap, adding man-hour (particularly when extruding tapering 6 and clamp-oning aperture centering) more steadily, is conducive to obtaining high-quality machining screw surface and improving cutter life.Hang at cutter and extend over 20 × D, or under having extension bar operating mode, cutter amount of deflection is very large, and screw tap adds very easily generation vibration and eccentric tapping under radial load effect in man-hour, causes interior threaded surface fineness poor, screwed hole is defective, even process moment of torsion large, cutter fractures, and the present invention successfully solves the problems referred to above in the improvement of above several respects, improve cutter rigidity, intensity and antivibration, anti-eccentric ability, improve cutter life and processed thread surface quality.
Further, Contoured squeeze rib 1 forms in extruding tapering 6 and corrects on press section 7, and Contoured squeeze rib 1 and lubrication groove 3 are linear pattern or spiral line type, and the present embodiment selects linear pattern.
With of the present invention there is the Contoured squeeze screw tap thread mill drilling of many faceted pebbles time, the cooked mode that employing dextrorotation inlet hole squeezing tapping, derotation exit, the extruding tapering 6 being positioned at front end during dextrorotation inlet hole progressively extrudes from small to large, correct press section 7 follow-up extruding and form complete screw thread, and corrective action is risen to forming thread.
Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, when not departing from technical solution of the present invention scope, can utilize the technology contents of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, or being revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to the technology of the present invention essence to any simple modification made for any of the above embodiments, equivalent variations and modification, all should drop in the scope of technical solution of the present invention protection.
Claims (8)
1. one kind has the Contoured squeeze screw tap of many faceted pebbles, comprise shank (8) and be at least provided with the thread forming portion of a forming thread, described thread forming portion comprises extruding tapering (6), correct press section (7) and two or more lubrication groove (3), it is characterized in that: described thread forming portion is at least provided with two Contoured squeeze ribs (1) between adjacent two lubrication grooves (3), N number of Contoured squeeze rib (1) is provided with between described adjacent two lubrication grooves (3), on the radial section in thread forming portion, the angle of adjacent two Contoured squeeze ribs (1) is α and β, 5 °≤| alpha-beta |≤20 °.
2. the Contoured squeeze screw tap with many faceted pebbles according to claim 1, is characterized in that: be provided with N number of Contoured squeeze rib (1), 2≤N≤3 between described adjacent two lubrication grooves (3).
3. the Contoured squeeze screw tap with many faceted pebbles according to claim 1 and 2, is characterized in that: on the radial section in thread forming portion, and described Contoured squeeze rib (1) is θ with the minimum angle of lubrication groove (3), 15 °≤θ≤75 °.
4. the Contoured squeeze screw tap with many faceted pebbles according to claim 3, is characterized in that: described Contoured squeeze rib (1) and lubrication groove (3) are linear pattern or spiral line type.
5. the Contoured squeeze screw tap with many faceted pebbles according to claim 1 and 2, is characterized in that: described two or more lubrication groove (3) is uniformly distributed along cutter outer circumference surface.
6. the Contoured squeeze screw tap with many faceted pebbles according to claim 4, is characterized in that: described two or more lubrication groove (3) is uniformly distributed along cutter outer circumference surface.
7. the Contoured squeeze screw tap with many faceted pebbles according to claim 1 and 2, is characterized in that: described Contoured squeeze rib (1) forms in extruding tapering (6) and corrects on press section (7).
8. the Contoured squeeze screw tap with many faceted pebbles according to claim 6, is characterized in that: described Contoured squeeze rib (1) forms in extruding tapering (6) and corrects on press section (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310018835.5A CN103934520B (en) | 2013-01-18 | 2013-01-18 | A kind of Contoured squeeze screw tap with many faceted pebbles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310018835.5A CN103934520B (en) | 2013-01-18 | 2013-01-18 | A kind of Contoured squeeze screw tap with many faceted pebbles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103934520A CN103934520A (en) | 2014-07-23 |
| CN103934520B true CN103934520B (en) | 2016-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310018835.5A Active CN103934520B (en) | 2013-01-18 | 2013-01-18 | A kind of Contoured squeeze screw tap with many faceted pebbles |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107717144A (en) * | 2017-11-06 | 2018-02-23 | 温岭市多宝力工具厂（普通合伙） | A kind of hole processing drill bit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2127645Y (en) * | 1992-07-02 | 1993-03-03 | 廖来全 | Thread tap |
| CN2396916Y (en) * | 1999-11-23 | 2000-09-20 | 齐长海 | Spiral fluted pressure tap |
| CN1511071A (en) * | 2001-05-22 | 2004-07-07 | ɽ��ʩά���� | Thread forming tap with non-circular cross-section and radially extending cutting edges |
| CN102712055A (en) * | 2010-01-13 | 2012-10-03 | Osg株式会社 | Thread forming tap with inside diameter finishing tooth |
| CN203018866U (en) * | 2013-01-18 | 2013-06-26 | 株洲钻石切削刀具股份有限公司 | Forming extrusion screw tap with multi-edge surface |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3609366B2 (en) * | 2001-10-22 | 2005-01-12 | オーエスジー株式会社 | Raising tap |
-
2013
- 2013-01-18 CN CN201310018835.5A patent/CN103934520B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2127645Y (en) * | 1992-07-02 | 1993-03-03 | 廖来全 | Thread tap |
| CN2396916Y (en) * | 1999-11-23 | 2000-09-20 | 齐长海 | Spiral fluted pressure tap |
| CN1511071A (en) * | 2001-05-22 | 2004-07-07 | ɽ��ʩά���� | Thread forming tap with non-circular cross-section and radially extending cutting edges |
| CN102712055A (en) * | 2010-01-13 | 2012-10-03 | Osg株式会社 | Thread forming tap with inside diameter finishing tooth |
| CN203018866U (en) * | 2013-01-18 | 2013-06-26 | 株洲钻石切削刀具股份有限公司 | Forming extrusion screw tap with multi-edge surface |
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| Publication number | Publication date |
|---|---|
| CN103934520A (en) | 2014-07-23 |
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