CN109648022B - Seamless burr-free extrusion tap and internal thread manufactured by same - Google Patents
Seamless burr-free extrusion tap and internal thread manufactured by same Download PDFInfo
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- CN109648022B CN109648022B CN201910106753.3A CN201910106753A CN109648022B CN 109648022 B CN109648022 B CN 109648022B CN 201910106753 A CN201910106753 A CN 201910106753A CN 109648022 B CN109648022 B CN 109648022B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 100
- 238000005520 cutting process Methods 0.000 claims description 17
- 241001270131 Agaricus moelleri Species 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 238000003825 pressing Methods 0.000 abstract description 4
- 238000007514 turning Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 235000009421 Myristica fragrans Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000001115 mace Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/08—Making helical bodies or bodies having parts of helical shape internal screw-threads
Abstract
A seamless burr-free extrusion tap and internal threads manufactured by the same. Relates to a processing tool, in particular to a seamless burr-free extrusion tap and internal threads manufactured by the same. The seamless burr-free extrusion tap and the internal thread manufactured by the seamless burr-free extrusion tap are provided, wherein the extrusion tap bottoms are connected in a specified r-arc mode, the defects and burrs of the internal thread formed by the conventional extrusion tap are eliminated, and the screwing rate of the thread is accurately controlled. Comprises a square part, a handle part and a threaded part, wherein the threaded part comprises a squeezing part and a calibration partThe standard part, the half angle of the tooth form of the said calibration part is alpha, the thread turning rate of the tooth form of the calibration part is delta, the pitch of the threaded part is P; the radius of curvature of the root of the thread is r; the radius of curvature r= (7-5 δ) P/(16 cos α); said pressing portion (l 5 ) The thread length of (2) is 0.5P-25P. The invention reduces the tapping torque of the extrusion tap and improves the strength and the production efficiency of the extrusion tap.
Description
Technical Field
The invention relates to a processing tool, in particular to a seamless burr-free extrusion tap and internal threads manufactured by the same.
Background
The existing internal thread forming technology is as follows: drilling or punching firstly, and then using the following three methods: (1) tapping by a screw tap; (2) turning threads; (3) milling the threads. Turning and milling threads are common in the art, however, because they are limited to cutting and machining threads of a nominal size.
Taps were classified as chip: chipless taps and chipless taps.
The chip tap is divided into: front chip removing tap (spiral tip tap, reverse spiral flute tap), rear chip removing tap (spiral flute tap), chip holding in flute tap (straight flute tap), chip holding tap; the thread root of the small diameter part of the common triangular internal thread machined by the method of cutting the internal thread of the tap is generally flat and is easy to have flash burrs.
Chipless taps are commonly known as extrusion taps. The extrusion tap is a novel threading tool for processing internal threads by utilizing a metal plastic deformation principle, is particularly suitable for copper alloy and aluminum alloy with lower strength and better plasticity, can be used for tapping materials with low hardness and large plasticity such as stainless steel, low carbon steel and the like, and also has application in medium carbon steel, high carbon steel and alloy steel.
The internal thread is processed by the traditional extrusion tap, the surface smoothness higher than that of the thread processed by the cutting tap can be obtained, the fiber tissue of metal is not damaged when the thread is extruded, the material density of the tooth part of the internal thread is improved, a hardening layer is formed on the surface of the thread, the strength of the internal thread is greatly improved, but the small-diameter root of the internal thread is provided with gaps and burrs. After the conventional extrusion tap is used for tapping thread forming, as the workpiece material plastically deforms and flows in the thread forming process, a gap is formed in the middle of the small-diameter root of the internal thread (as shown in figure 21), and when the thread is assembled, an external thread is often caused to be wrongly screwed into the gap, so that the external thread is possibly not screwed into the internal thread profile which is required to enter, the thread screwing is not facilitated, and the extrusion tap is not used in occasions with high requirements on the thread although the characteristics of no scraps and the advantages of the strength of the internal thread are improved.
Generally, the root of the 60-degree triangle thread at the small diameter part of the internal thread is flat, namely, the root and the tooth form are connected in a straight line, and an included angle of about 120 degrees is formed between the root and the tooth form, and flash burrs are usually formed, so that the thread assembly is not facilitated.
Disclosure of Invention
Aiming at the problems, the invention provides a seamless burr-free extrusion tap and an internal thread manufactured by the same, wherein the extrusion tap is formed by connecting the thread bottoms of the extrusion taps into specified r-arc, so that the defects and burrs of the internal thread formed by the conventional extrusion tap are eliminated, and the screwing rate of the threads is accurately controlled.
The technical scheme of the invention is as follows: the device comprises a square part, a handle part and a thread part, wherein the thread part comprises an extrusion part and a calibration part, the tooth half angle of the calibration part is alpha, the tooth thread screwing rate of the calibration part is delta, and the thread pitch of the thread part is P; the radius of curvature of the root of the thread is r; the radius of curvature r= (7-5 δ) P/(16 cos α);
the original triangular height of the thread of the calibration part is H, the flat-top straight line of the crest of the calibration part is reduced to the cutting height H of the arc root at the minor diameter of the thread taking H/8 as the limit 2 Less than H/4, and descending from H/4 by a prescribed dimension (b).
The predetermined size (b) is 5-45 μm.
The thread part has a tooth angle of 60 DEG, and the curvature radius r of the root and the small diameter cutting height h of the root 2 Equal.
The thread crest of the extrusion part takes the shape of an arcNoodles (r) 1 )
Said pressing portion (l 5 ) The thread length of (2) is 0.5P-25P.
The small-diameter crests of the internal threads are arc surfaces in a continuous closed state or in a micro-slit state.
The seamless burr-free extrusion tap can obtain continuous and smooth small-diameter root R circular arc internal threads because the root R circular arcs at the small-diameter positions of the threads are effectively controlled, and the continuous and smooth small-diameter root R circular arcs are connected with tooth surfaces to form smooth curves, so that the root circular arcs have guiding function when the threads are screwed, the screwing with external threads is guided, the thread is superior to flat-bottom threads, and the thread assembly is facilitated. The problem of the flash burr and the gap of former extrusion screw tap shaping internal thread has been solved, the advantage that extrusion screw thread is superior to cutting shaping screw thread has been embodied, has improved threaded connection's intensity and quality by a wide margin, has improved internal thread production efficiency, adapts to the threaded connection of high requirement more. The internal thread in the micro-gap state (the micro-gap is arranged in the middle of the root, and the root and the tooth surface are connected in an arc manner, as shown in fig. 22) can be obtained by increasing the size of the tapping bottom hole, and the internal thread is applied to the occasion with low small diameter requirement.
The invention has the following characteristics:
1. solves the problems of gaps and burrs generated at the small diameter of the internal thread when the internal thread is formed by the traditional extrusion tap.
2. The thread screwing rate (delta) is precisely controlled by controlling the arc of the thread root r of the seamless burr-free extrusion tap, and r= (7-5 delta) P/(16 cos alpha).
3. The tapping torque of the extrusion tap is reduced, and the strength and the production efficiency of the extrusion tap are improved.
Drawings
Figure 1 is a schematic view of the thread form configuration of the calibrated portion of the extrusion tap of the present invention,
figure 2 is a schematic view of the thread structure of the calibrated portion of the tap,
figure 3 is a schematic view of the thread root structure of the calibrated portion of the tap,
figure 4 is a schematic view of the configuration of the thread crests of the tap relief portion,
fig. 5 is type 1: a schematic structural view of the extrusion tap for the through hole below M7,
fig. 6 is type 2: a structural schematic diagram of the extrusion tap for blind holes below M7,
fig. 7 is type 3: a structural schematic diagram of a extruding tap with a neck for a blind hole,
fig. 8 is type 4: a structural schematic diagram of the extrusion tap above M7,
fig. 9 is type 5: a structural schematic diagram of the nut extruding tap below M5,
fig. 10 is type 6: a structural schematic diagram of a round handle (square head-free) nut extrusion tap with the diameter d epsilon (5 mm-30 mm),
fig. 11 is type 7: a structural schematic diagram of a nut extruding tap with the diameter d more than 5mm,
fig. 12 is type 8: a schematic structural view of the extrusion tap with an inner cold hole,
figure 13 is a schematic view of the cross-sectional shape of the 3-edge extrusion tap threads,
figure 14 is a schematic view of the cross-sectional shape of the threads of a 4-sided extrusion tap,
figure 15 is a schematic view of the cross-sectional shape of the threads of a 5-edge extrusion tap,
figure 16 is a schematic view of the cross-sectional shape of the threads of a 6-sided extrusion tap,
figure 17 is a schematic diagram of the thread forming structure of the seamless burr-free extrusion tap in the tapping state,
figure 18 is a schematic view of a thread forming structure of a common extrusion tap in a tapping state,
figure 19 is a schematic view of the thread forming structure of the tap in the tapped state,
FIG. 20 is a view of the closed state of the internal thread small diameter root of the extrusion tap formed according to the invention;
FIG. 21 is a view of the internal thread small diameter root profile formed using a conventional tap;
FIG. 22 is a view showing the internal thread small diameter root micro-gap state of the extrusion tap according to the present invention;
in the figure, d is the nominal dimension of the tap thread, d 1 Is the diameter of the handle, d 2 Is the neck diameter d 3 Is the internal cold bore diameter, L is the tap edge-to-edge total length, L is the thread length, L 1 Is neck length (retracting part), l 2 Is the length of the square head of the screw tap 5 Is the length of the extrusion thread, l minus l 5 Part is a thread calibration part, K r Is the principal deflection angle R of the extrusion cone k The radius of curvature of the crest of the extrusion tap is the radius of curvature of the crest of the extrusion tap, the oil groove is 5, and the square head is 2a (the square head is in a regular quadrangle or a regular hexagon).
Detailed Description
The invention is shown in fig. 1-21; the screw tap comprises a handle part and a screw thread part, wherein the screw thread part comprises a squeezing part and a calibration part, the tooth shape of the squeezing part is that the later tooth is higher than the earlier tooth, when the screw tap moves forward, each edge of each tooth squeezes one layer of metal to deform, and the main squeezing forming work of the screw tap is carried by the squeezing part. The tooth shape of the calibration part is complete, the calibration part is mainly used for calibrating threads and plays a role in guiding, the half angle of the tooth shape of the calibration part is alpha, the screwing rate of the tooth shape threads of the calibration part is delta, and the pitch of the threads of the thread part is P; the radius of curvature of the root of the thread is r; the radius of curvature r= (7-5 δ) P/(16 cos α);
the original triangular height of the thread of the calibration part is H, the flat-top straight line of the crest of the calibration part is reduced to the cutting height H of the arc root at the minor diameter of the thread taking H/8 as the limit 2 Is smaller than (shallow to not more than) H/4, and descends from the H/4 by a prescribed dimension (b) and cuts the height H of the arc root at the minor diameter of the thread 2 The value is the radius, which is the arc of the root r of the seamless burr-free extrusion tap and is tangent to the two tooth surfaces.
The predetermined size (b) is 5-45 μm.
The thread part has a tooth angle of 60 DEG, and the curvature radius r of the root and the small diameter cutting height h of the root 2 Equal.
The thread crest of the extrusion part is an arc surface (r 1 ). Arc surface (r) 1 ) The tangent point to the tooth surface is at H/8.
Said pressing portion (l 5 ) The thread length of (2) is 0.5P-25P.
The crests at the small diameter of the internal thread are continuously closed arc surfaces or are in micro-slit states.
The thread screwing rate is precisely controlled by controlling the r arc value of the thread root of the seamless burr-free extrusion tap (as shown in figure 2);
setting: radius of curvature of root r
The height of the original triangle of the thread is H
The height of the theoretical teeth is h
The actual engagement height is h 1
The small diameter of the root cuts the height h 2
Pitch of P
Tooth half angle alpha
The thread turn-up ratio was δ (see h=5h/8=100%)
The conditions are known: r=oc, ae=h, ef=p/2,h =h-H/8-H/4=5h/8, < oac=α
In ΔABC and ΔAEF
∵∠AEF＝∠ABC＝90°
∠BAC＝∠EAF
∴△ABC～△AEF
∴AB/AE＝BC/EF①
h＝H－H/8－H/4＝5H/8
δ＝h 1 /h×100％＝h 1 /(5H/8)
h1＝δh＝δ·5H/8
AB＝H-H/8-h 1 ＝H-H/8-δ·5H/8
AE＝H
In Rt delta OBC = OCB = = OAC = α
OC＝r
BC＝OC·cosα＝rcosα
EF＝P/2
And substituting the above proportional formula (1) to obtain:
(H-H/8-δ·5H/8)/H＝rcosα/P/2
simplifying and obtaining:
r＝(7-5δ)P/(16cosα)
the root arc radius r and the root minor diameter cutting height h in a thread with a 60 DEG profile angle (30 DEG profile half angle) 2 Equal.
As in fig. 3, the known conditions are: QAJ =30°, OCJ = OQJ =90°, oq=oc=r，AQ＝h 2
In Delta OQJ and Delta OCJ
∵OQ＝OC＝r
OJ＝OJ
∠OCJ＝∠OQJ＝90°
∴△OQJ≌△OCJ(HL)
∴∠QOJ＝∠COJ
OJ bisecting angle AOC
∵∠OAC＝30°
∠OCA＝90°
∴∠AOC＝60°
Further, the angle AOC is bisected by the mace
∴∠QOJ＝30°＝∠QAJ
Delta OAJ is an isosceles triangle
∴OQ＝AQ
∴r＝OQ＝AQ＝h 2
∴r＝h 2
In a thread having a thread form angle of 60 ° (thread form half angle 30 °), when the cutting height H2 of the circular arc root at the minor diameter of the thread is equal to H/4, the thread turn-up rate δ is 80%.
As shown in fig. 3, the known conditions are: h is a 2 ＝H/4；h＝5H/8；δ＝(h 1 /h)*100％
h 1 ＝h-QG
It has been previously demonstrated that r=oq=oc=aq=h 2 ，∠AOC＝60°，
∴∠QOC＝60°
Delta QOC is an equilateral triangle
Further, frightened CG T OQ
CG bisecting angle OCQ
∴QG＝OG＝(1/2)*OQ＝(1/2)*h 2 ＝(1/2)*(H/4)＝H/8
∴h 1 ＝h–QG＝(5H/8)–(H/8)＝4H/8
∴δ＝(h 1 /h)*100％＝(4H/8)/(5H/8)＝80％
The arc of the root R of the extrusion tap is strictly controlled, and the size of the bottom hole before tapping of the workpiece is adjusted, so that the ideal arc of the root R of the internal thread of the triangular thread can be obtained, extrusion gaps of the root of the internal thread are effectively eliminated, burrs of the root of the internal thread are avoided, the arc of the root of the internal thread is smoothly transited, and the guiding and screwing of the external thread are facilitated. In the past, the size precision of the bottom hole before tapping is required to be high due to the generation of the gaps, and the precision of the bottom hole before tapping is required to be reduced by the seamless burr-free extrusion tap with the tooth bottom formed into a specified r-arc. The small-diameter tooth bottom R arc internal thread without burrs can be obtained by properly adjusting the bottom hole size according to the materials of different workpieces.
The extrusion tap root is made into a specified circular arc, so that the stress concentration of sharp corners of the tap thread root is improved, the strength of the extrusion tap is enhanced, the machining allowance is reduced, and the production efficiency of the extrusion tap is improved.
Extrusion portion (l of extrusion tap 5 ) The crest of the tooth is also made into a circular arc r 1 The tangent point of the crest arc and the tooth surface is at H/8.
Comparison: the extrusion tap with the crest flat top of the extrusion part and the extrusion tap with the crest circular arc top of the extrusion part are more beneficial to plastic deformation of workpiece materials in the tapping process, are convenient for forming internal threads, and reduce the tapping torque of the extrusion tap.
Type of extrusion tap
As in fig. 5, type 1: through-hole below M7, l 5 2P-6P is produced.
As in fig. 6, type 2: blind hole below M7, l 5 Making into 0.5P-3P.
As in fig. 7, type 3: for blind hole with neck l 5 Making into 0.5P-3P.
As in fig. 8, type 4: m7 or more, l 5 The preparation is 0.5P-6P.
As in fig. 9, type 5: screw tap for extruding nut below M5, l 5 Is made into 18P-25P.
As in fig. 10, type 6: diameter d E (5 mm-30 mm)]Round handle (square head-free) nut extrusion tap l 5 20P to 25P.
As in fig. 11, type 7: nut extrusion tap with diameter d > 5mm, l 5 20P to 25P.
As in fig. 12, type 8: extrusion tap with inner cold hole, generally used for blind hole, l 5 Making into 0.5P-3P.
The number of edges of the extrusion tap can be set to be odd or even, and can be set according to specific technical conditions. R is R k The radius of curvature of the prism top can be adjusted according to different workpiece materials. And 5, the oil groove can be used for clamping the chamfering tool, and the extrusion tap can be provided with or without the oil groove.
Compared with the internal thread profile formed by the traditional extrusion tap, the internal thread root formed by the traditional extrusion tap has the defects and burrs, the internal thread root formed by the extrusion tap has the advantages of no defects and burrs, and smooth arc of the root and connection between two thread surfaces.
The screw connection strength is ensured by the material of the workpiece and the screwing rate of the screw connection and the strength of the screw teeth.
The existing 60-degree triangular thread (the half angle of the tooth type is 30 degrees) connected internal thread does not have the R arc requirement on the root of the tooth at the small diameter position.
The invention provides an extrusion tap which can eliminate gaps and burrs and can precisely control the screwing rate of threads. In the tap profile of 60 ° profile angle, when the thread original triangle height is H pitch P, the thread profile of the extrusion tap calibration section (as in fig. 5) is set to: the flat-top straight line of the thread crests is as low as its cut height is as close to H/8 (see FIG. 2). Cutting height h of arc root at small diameter of thread 2 Shallow to not exceed H/4, if the height H is cut 2 Beyond H/4, the thread turning rate delta is lower than 80%, the thread strength is reduced, and the formation of the small-diameter root R arc of the internal thread is not facilitated. Cutting height h 2 The internal thread with the thread screwing rate delta of more than 80 percent can be obtained without exceeding H/4, and the formation of the small-diameter root R arc of the internal thread is facilitated, so that the high-strength thread is obtained. And from H/4 down to a prescribed size (b) at H 2 Root r arc (r=h in 60 ° triangle thread form) of seamless burr-free extrusion tap with value of radius 2 ) And is tangential to the two facets (see fig. 3). Pressing portion (l) 5 ) The tangent point of the arc of the thread crest and the tooth surface isH/8 (see FIG. 4) and gradually reduces the thread diameter at the front end of the tap relief portion to a point where the circular arc crest diameter dimension of the tap is less than the tap pilot hole dimension. The predetermined size (b) is 5 μm to 45. Mu.m.
Examples
The lead-free copper nut is made of HB159-1.5Q/NPWZ004, the screw thread specification M1 is 0.25, the screw thread length is 2.8mm, 88% screw thread screwing rate is required to be obtained, the existing technology is that the screw tap is used for extrusion tapping, the size of a tapping bottom hole is 0.88mm, the small diameter is expanded to be smaller than the small diameter size of 88% screw thread screwing rate, then the hole is bored to remove gaps and burrs to reach the size of 88% screw thread screwing rate, but burrs are still generated at the joint of a thread withdrawal surface and a thread bottom during boring, and a 40-time micro mirror is visible, so that the tapping difficulty is increased, the service life of the screw tap is reduced, and the screw thread assembly is affected.
The inventors tested the following with a seamless burr-free extrusion tap: the required screw thread screwing rate (delta) 88% is substituted into a formula r= (7-5 delta) P/(16 cos alpha) =0.0469 mm, the arc of the root r of the extrusion tap is controlled to be r=0.0469 mm, the tolerance is +/-0.005 mm, the lubricating oil is sufficiently supplied, the tapping is smooth, and the screw thread screwing rate of 88% is directly obtained. Generally, internal threads are machined, chamfering is needed at the inlet and the outlet of the threads, the chamfering is also needed before tapping, the seamless burr-free extrusion tap is used for manufacturing the internal threads, the chamfering is needed to be arranged after tapping, the cutting direction of a chamfering cutter is opposite to the screw direction of the threads, otherwise, the phenomenon of cutting is easy to occur, the chamfering depth is needed to reach 1P-1.25P, the defect formed by the non-full inner thread bottoms of extrusion molding during extrusion at the inlet and the outlet of the internal threads is removed, and near perfect internal threads can be obtained after chamfering. Flash burrs and gaps are not found at the small diameter of the internal thread under a microscope of 100 times. The seamless burr-free extrusion tap is used, so that the processing procedures are reduced, the production efficiency is improved, and the threaded connection strength and the smoothness of threaded assembly are improved.
The present invention is not limited to the above-described embodiments, and may be carried out within a range not departing from the spirit of the present invention: (1) the thread pitch (P) or (2) the thread half angle (alpha) or (3) the thread screwing rate (delta).
The seamless burr-free extrusion tap can obtain continuous and smooth small-diameter root R circular arc internal threads because the root R circular arc at the small-diameter part of the threads is effectively controlled, and the continuous and smooth small-diameter root R circular arc internal threads are connected with tooth surfaces to form smooth curves, so that the root circular arc parts have guiding function when the threads are screwed, the screwing with external threads is guided, the threads are superior to flat-bottom threads, and the thread assembly is facilitated. The problem of the flash burr and the gap of extrusion screw tap shaping internal thread in the past has been solved, has embodied extrusion screw thread and has been superior to cutting shaping screw thread's advantage, has improved threaded connection's intensity and quality by a wide margin, has improved internal thread production efficiency, adapts to the threaded connection of high requirement more, for example: traffic field, IT trade, industrial automation assembly line assembly etc. need threaded connection's occasion.
The stress concentration of sharp corners of the thread bottoms of the extrusion tap is improved due to the fact that the thread bottoms of the extrusion tap are made into the specified circular arcs, the strength of the extrusion tap is enhanced, the grinding allowance of the extrusion tap is reduced, and the machining efficiency is improved.
The ideal root R circular arc of the triangular thread internal thread can be obtained by strictly controlling the root R circular arc of the seamless burr-free extrusion tap and controlling the size of the bottom hole before tapping of the workpiece, so that extrusion gaps of the internal thread root are effectively eliminated, and burrs of the internal thread root are avoided.
For the purposes of this disclosure, the following points are also described:
(1) The drawings of the embodiments disclosed in the present application relate only to the structures related to the embodiments disclosed in the present application, and other structures can refer to common designs;
(2) The embodiments disclosed herein and features of the embodiments may be combined with each other to arrive at new embodiments without conflict;
the above is only a specific embodiment disclosed in the present application, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. The seamless burr-free extrusion tap comprises a handle part and a thread part, wherein the thread part comprises an extrusion part and a calibration part, and is characterized in that the half angle of a tooth of the calibration part is alpha, the thread screwing rate of the tooth of the calibration part is delta, and the pitch of the thread part is P; the radius of curvature of the root of the thread is r; the radius of curvature r= (7-5 δ) P/(16 cos α);
the original triangular height of the thread of the calibration part is H, the flat-top straight line of the crest of the calibration part is reduced to the cutting height H of the arc root at the minor diameter of the thread taking H/8 as the limit 2 Less than H/4, and descending from H/4 by a prescribed dimension (b).
2. The seamless burr-free extrusion tap of claim 1, wherein said prescribed dimension (b) is from 5 μm to 45 μm.
3. The seamless burr-free extrusion tap according to claim 1, wherein the tooth angle of said calibration portion is 60 ° and the radius of curvature r of said root is equal to the cutting height h of the circular arc root at the minor thread diameter 2 Equal.
4. The seamless burr-free extrusion tap according to claim 1, wherein the thread crests of the extrusion are rounded (r 1 )。
5. A seamless burr-free extrusion tap according to claim 1, wherein the extrusion (l 5 ) The thread length of (2) is 0.5P-25P.
6. The internal thread manufactured by the seamless burr-free extrusion tap according to claim 1, wherein the small-diameter crest of the internal thread is in a continuous closed arc surface or in a micro-slit state.
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|---|---|---|---|---|
| GB1039564A (en) * | 1962-04-27 | 1966-08-17 | Balax Internat Ltd | Method of manufacture of thread-forming taps |
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