CN109648022A - A kind of seamless impulse- free robustness thread forming tap and its internal screw thread of production - Google Patents
A kind of seamless impulse- free robustness thread forming tap and its internal screw thread of production Download PDFInfo
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- CN109648022A CN109648022A CN201910106753.3A CN201910106753A CN109648022A CN 109648022 A CN109648022 A CN 109648022A CN 201910106753 A CN201910106753 A CN 201910106753A CN 109648022 A CN109648022 A CN 109648022A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000002788 crimping Methods 0.000 claims abstract description 17
- 241001270131 Agaricus moelleri Species 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 abstract description 22
- 238000000465 moulding Methods 0.000 abstract description 12
- 238000003754 machining Methods 0.000 abstract description 8
- 230000033228 biological regulation Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 19
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 210000003371 toe Anatomy 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 241000220317 Rosa Species 0.000 description 2
- 238000003825 pressing 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
- 230000006978 adaptation Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000035515 penetration Effects 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
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000007514 turning Methods 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 kind of seamless impulse- free robustness thread forming tap and its internal screw thread of production.It is related to a kind of machining tool more particularly to a kind of seamless impulse- free robustness thread forming tap and its internal screw thread of production.Provide it is a kind of thread forming tap tooth bottom is made into regulation r circular sliding slopes, eliminate the scarce seam and burr of previous thread forming tap molding internal screw thread, be precisely controlled a kind of seamless impulse- free robustness thread forming tap of threaded engagement rate and its internal screw thread of production.Including Fang Bu ﹑ shank and threaded portion, the threaded portion includes crimping section and calibrated section, and the half of thread angle in the calibration portion is α, and the tooth form threaded engagement rate in calibration portion is δ, and the screw pitch of threaded portion is P；The radius of curvature at the tooth bottom of threaded portion is r；Radius of curvature r=(7-5 δ) P/ (16cos α)；Crimping section (the l5) reach be 0.5P-25P.The present invention reduces the tapping torque of thread forming tap, improves the intensity and production efficiency of thread forming tap.
Description
Technical field
The present invention relates to a kind of machining tool more particularly to a kind of seamless impulse- free robustness thread forming taps and its interior spiral shell of production
Line.
Background technique
Existing forming internal threads technology is: first drilling or punching, then with following three kinds of methods: 1. tap tapping；2. vehicle
Cut screw thread；3. milling thread.No matter first cutted thread and milling thread, because turning and milling thread belong to machining and office
It is limited to process the biggish screw thread of nominal dimension, and it is more common with the method for screw tap processing screw thread.
Screw tap is to there is chipless to be classified as: having bits screw tap and chipless screw tap.
There is bits screw tap to be divided into chip removal direction: front clearance screw tap (spiral pointed tap, backpitch slot screw tap), rear chip removal screw tap
(spiral fluted tap) holds bits in slot plug tap (straight slot screw tap), machine tap with internal swarf passage；Pass through the method for cut tap machining internal thread
Tooth bottom is usually flat at the common triangle internal screw thread path processed, and has been easy burr.
Chipless screw tap common are thread forming tap.Thread forming tap machining internal thread using metal plastic deformation principle
A kind of Novel threaded cutter, plasticity preferable copper alloy lower especially suitable for intensity and aluminium alloy, it can also be used to stainless steel and
The material tapping that the hardness such as mild steel are low, plasticity is big, also has application in medium carbon steel and high-carbon steel and steel alloy.
With previous thread forming tap come machining internal thread, the higher any surface finish of the available screw thread than cut tap processing
Degree, and the fibr tissue of metal is not destroyed when extrusion forming screw thread, improve the material density of internal screw thread toothed portion, screw thread
Surface forms hardened layer, is added significantly to internal screw thread intensity, but internal screw thread path tooth bottom has and lacks seam and have burr.With
Toward after the molding of thread forming tap tapping thread, since the flowing of workpiece material plastic deformation, final internal screw thread are small during thread forming
Diameter tooth bottom middle, which is formed, lacks seam (such as Figure 21), and external screw thread tooth is often resulted in Screw assembly and is accidentally screwed into scarce seam, is caused
External screw thread is possible to rotation not into the internal screw thread tooth form that should enter, and is unfavorable for threaded engagement, although having the characteristics of chipless and increasing
The advantages of strong intensity of internal screw thread, but the occasion for not had high request to screw thread uses.
Tooth bottom is all flat at the internal screw thread path of usual 60 ° of angular threads, that is, straight line connection, tooth bottom and facing shape
At two 120 ° or so of angle, and often there is burr, is unfavorable for Screw assembly.
Summary of the invention
The present invention in view of the above problems, provide it is a kind of thread forming tap tooth bottom is made into regulation r circular sliding slopes, eliminate with
Toward the scarce seam and burr of thread forming tap molding internal screw thread, a kind of seamless impulse- free robustness for being precisely controlled threaded engagement rate squeezes silk
Cone and its internal screw thread of production.
The technical scheme is that including Fang Bu ﹑ shank and threaded portion, the threaded portion includes crimping section and calibration
Part, the half of thread angle in the calibration portion are α, and the tooth form threaded engagement rate in calibration portion is δ, and the screw pitch of threaded portion is P；Threaded portion
Tooth bottom radius of curvature be r；Radius of curvature r=(7-5 δ) P/ (16cos α)；
The screw thread original triangle height in the calibration portion is H, and the flat-top straight line of calibration portion crest is cut as low as it
Height is using H/8 as the limit, and circular arc tooth bottom cuts height h at diameter of thread2Less than H/4, and with predetermined size (b) from H/4
Decline.
The predetermined size (b) is 5 μm~45 μm.
The thread form angle of the threaded portion is 60 °, and the radius of curvature r and tooth bottom path at the tooth bottom cut height h2It is equal.
The thread crest of the press section is in arc surface (r1)
Crimping section (the l5) reach be 0.5P-25P.
The path crest of the internal screw thread is in the arc surface of continuous closed state or in slit state.
Seamless impulse- free robustness thread forming tap of the invention is available because effectively controlling the tooth bottom r circular arc at diameter of thread
Continuously, smooth path tooth bottom R circular arc internal screw thread, and it is made to connect to form smooth curve with facing, tooth when threaded engagement
Bottom circular arc portion plays the role of guiding, has guided and has screwed with externally threaded, is better than flat screw thread, more conducively Screw assembly.It solves
The burr of previous thread forming tap molding internal screw thread and scarce seam problem, embody extrusion forming screw thread better than cutting forming spiral shell
The intensity and quality of threaded connection greatly improved in the advantages of line, improves internal screw thread production efficiency, more adapts to high request
It is threadedly coupled.Can also be by increasing tapping bottom outlet size, obtaining slit state, (tooth bottom middle is provided with slit, tooth bottom and tooth
Face or circular sliding slopes, such as Figure 22) internal screw thread, applied to the occasion of less demanding to path.
The present invention has a characteristic that
1, the scarce seam and burr generated at internal screw thread path when solving previous thread forming tap molding internal screw thread.
2, threaded engagement rate (δ), r=(7- are relatively precisely controlled by control seamless impulse- free robustness thread forming tap tooth bottom r circular arc
5δ)P/(16cosα)。
3, the tapping torque for reducing thread forming tap, improves the intensity and production efficiency of thread forming tap.
Detailed description of the invention
Fig. 1 is thread forming tap calibrated section thread shape structural schematic diagram of the present invention,
Fig. 2 is thread forming tap calibrated section helicitic texture schematic diagram,
Fig. 3 is thread forming tap calibrated section Bottom of Thread structural schematic diagram,
Fig. 4 is the structural schematic diagram of thread forming tap crimping section thread crest,
Fig. 5 is Class1: M7 with the structural schematic diagram of lower through-hole thread forming tap,
Fig. 6 is the structural schematic diagram of the following blind hole thread forming tap of type 2:M7,
Fig. 7 is type 3: structural schematic diagram of the blind hole with neck thread forming tap,
Fig. 8 is the structural schematic diagram of the above thread forming tap of type 4:M7,
Fig. 9 is type 5:M5 with the structural schematic diagram of lower nut thread forming tap,
Figure 10 is type 6: diameter d ∈ (5mm~30mm] circle handle (no square toes) nut thread forming tap structural schematic diagram,
Figure 11 is type 7: the structural schematic diagram of the nut thread forming tap of diameter d > 5mm,
Figure 12 is type 8: the structural schematic diagram of the thread forming tap with interior cold hole,
Figure 13 is 3 rib thread forming tap thread cross-section shape and structure schematic diagrames,
Figure 14 is 4 rib thread forming tap thread cross-section shape and structure schematic diagrames,
Figure 15 is 5 rib thread forming tap thread cross-section shape and structure schematic diagrames,
Figure 16 is 6 rib thread forming tap thread cross-section shape and structure schematic diagrames,
Figure 17 is the seamless impulse- free robustness thread forming tap tapping state thread forming structural schematic diagram of this case,
Figure 18 is common thread forming tap tapping state thread forming structural schematic diagram,
Figure 19 is cut tap tapping state thread forming structural schematic diagram,
Figure 20 is the molding internal screw thread path tooth underseal closed state tooth form figure of thread forming tap of the invention；
Figure 21 is using the molding internal screw thread path tooth bottom tooth form figure of existing thread forming tap；
Figure 22 is the molding internal screw thread path tooth bottom slit state tooth form figure of thread forming tap of the invention；
D is the nominal dimension of screw-tap threaded, d in figure1It is handle diameter, d2It is neck diameter, d3It is interior cold aperture, L is screw tap edge to edge
Overall length, l are reach, l1It is neck length (withdrawing part), l2It is screw tap square toes length, l5Be crimping section reach,
L subtracts l5Part is screw thread calibrated section, KrIt is crush cones tool cutting edge angle, RkIt is thread forming tap rib top radius of curvature, 5 is oil groove, 2a
It is square toes (square toes are in regular quadrangle or regular hexagon).
Specific embodiment
The present invention is as shown in Fig. 1-2 1；Including shank and threaded portion, the threaded portion includes crimping section and calibrated section,
Crimping section tooth form is that latter tooth is higher than previous tooth, and when thread forming tap forward travel, each rib of each tooth squeezes one
Layer flow of metal, the main extrusion forming work of thread forming tap is undertaken by crimping section.The tooth form of calibrated section be it is complete,
It is mainly used to calibrate screw thread, and play the guiding role, and the half of thread angle in the calibration portion is α, the tooth form threaded engagement in calibration portion
Rate is δ, and the screw pitch of the screw thread of threaded portion is P；The radius of curvature at the tooth bottom of threaded portion is r；Radius of curvature r=(7-5 δ) P/
(16cosα)；
The screw thread original triangle height in the calibration portion is H, and the flat-top straight line of calibration portion crest is cut as low as it
Height is using H/8 as the limit, and circular arc tooth bottom cuts height h at diameter of thread2Less than (shallow to be no more than) H/4, and from H/4 with
Predetermined size (b) decline cuts height h with circular arc tooth bottom at diameter of thread2Value is that radius makees seamless impulse- free robustness thread forming tap
Tooth bottom r circular arc, and it is tangent with two facings.
The predetermined size (b) is 5 μm~45 μm.
The thread form angle of the threaded portion is 60 °, and the radius of curvature r and tooth bottom path at the tooth bottom cut height h2It is equal.
The thread crest of the press section is in arc surface (r1).Arc surface (r1) with the points of tangency of facing at H/8.
Crimping section (the l5) reach be 0.5P-25P.
Crest at the internal screw thread path is in continuous closed arc surface or is in slit state.
Threaded engagement rate (such as Fig. 2) is relatively precisely controlled by control seamless impulse- free robustness thread forming tap tooth bottom r circular arc value；
If: tooth bottom radius of curvature is r
Screw thread original triangle height is H
Theoretical thread height is h
Practical engagement height is h1
Tooth bottom path cuts height h2
Screw pitch is P
Half of thread angle α
Threaded engagement rate is δ (referring to h=5H/8=100%)
Known conditions: r=OC, AE=H, EF=P/2, h=H-H/8-H/4=5H/8, ∠ OAC=α
In △ ABC and △ AEF
∵ ∠ AEF=∠ ABC=90 °
∠ BAC=∠ EAF
∴ △ ABC~△ AEF
∴ AB/AE=BC/EF is 1.
H=H-H/8-H/4=5H/8
δ=h1/ h × 100%=h1/(5H/8)
H1=δ h=δ 5H/8
AB=H-H/8-h1=H-H/8- δ 5H/8
AE=H
The ∠ OCB=∠ OAC=α in Rt △ OBC
OC=r
BC=OCcos α=rcos α
EF=P/2
1. back substitution aforementioned proportion formula obtains:
(H-H/8- δ 5H/8)/H=rcos α/P/2
Abbreviation obtains:
R=(7-5 δ) P/ (16cos α)
Radius of rounded root r and tooth bottom path cut height h in the screw thread of 60 ° of thread form angles (30 ° of half of thread angle)2Phase
Deng.
Such as Fig. 3, it is known that condition: ∠ QAJ=30 °, ∠ OCJ=∠ OQJ=90 °, OQ=OC=r, AQ=h2
In △ OQJ and △ OCJ
∵ OQ=OC=r
OJ=OJ
∠ OCJ=∠ OQJ=90 °
∴△OQJ≌△OCJ(HL)
∴ ∠ QOJ=∠ COJ
∴ OJ divides ∠ AOC equally
∵ ∠ OAC=30 °
∠ OCA=90 °
∴ ∠ AOC=60 °
∵ OJ divides ∠ AOC equally again
∴ ∠ QOJ=30 °=∠ QAJ
∴ △ OAJ is isosceles triangle
∴ OQ=AQ
∴ r=OQ=AQ=h2
∴ r=h2
In the screw thread of 60 ° of thread form angles (30 ° of half of thread angle), the height h2 that cuts at circular arc tooth bottom is equal at diameter of thread
When H/4, threaded engagement rate δ is 80%.
As shown in figure 3, known conditions: h2=H/4；H=5H/8；δ=(h1/ h) * 100%
h1=h-QG
Front has been proven that r=OQ=OC=AQ=h2, ∠ AOC=60 °,
∴ ∠ QOC=60 °
∴ △ QOC is equilateral triangle
∵ CG ⊥ OQ again
∴ CG divides ∠ OCQ equally
∴ QG=OG=(1/2) * OQ=(1/2) * h2=(1/2) * (H/4)=H/8
∴h1=h-QG=(5H/8)-(H/8)=4H/8
∴ δ=(h1/ h) * 100%=(4H/8)/(5H/8)=80%
The tooth bottom r circular arc of strict control thread forming tap and the bottom outlet size before adjustment work-piece tapping are available comparatively ideal
The tooth bottom R circular arc of angular thread internal screw thread, the extruding for effectively eliminating internal screw thread tooth bottom lack seam, avoid flying for internal screw thread tooth bottom
Burr, and internal screw thread tooth bottom circular arc is made to smoothly transit, be conducive to guidance and screwed with externally threaded.Previous thread forming tap is due to lacking
The generation of seam, it is very high to the bottom outlet dimension precision requirement before tapping, and the seamless impulse- free robustness that tooth bottom is made into regulation r circular arc squeezes silk
Cone decreases to the bottom outlet required precision before tapping.The material appropriate adjustment bottom outlet size according to different workpieces is only needed, just
The internal screw thread of the path tooth bottom R circular arc of available seamless non-trimming burr.
The stress that thread forming tap tooth bottom is made into the wedge angle that regulation circular arc also improves screw-tap threaded tooth bottom is concentrated, and is enhanced crowded
The intensity of silk pressing cone, reduces machining allowance, improves thread forming tap production efficiency.
Crimping section (the l of thread forming tap5) crest be also made into circular arc r1, the points of tangency of crest circular arc and facing is in H/8
Place.
Compare: the thread forming tap of crimping section crest flat-top, the thread forming tap with crimping section crest dome are being attacked
The plastic deformation that the thread forming tap of crest dome is more conducive to workpiece material during silk reduces convenient for the formation of internal screw thread
The tapping torque of thread forming tap.
The type of thread forming tap
Such as Fig. 5, Class1: M7 is used with lower through-hole, l5It is made into 2P~6P.
Such as Fig. 6, the following blind hole of type 2:M7 is used, l5It is made into 0.5P~3P.
Such as Fig. 7, type 3: band neck blind hole is used, l5It is made into 0.5P~3P.
Such as Fig. 8, type 4:M7 or more, l5It is made into 0.5P~6P.
Such as Fig. 9, type 5:M5 is with lower nut thread forming tap, l5It is made into 18P~25P.
Such as Figure 10, type 6: diameter d ∈ (5mm~30mm] circle handle (no square toes) nut thread forming tap, l5Be made into 20P~
25P。
Such as Figure 11, type 7: the nut thread forming tap of diameter d > 5mm, l5It is made into 20P~25P.
Such as Figure 12, type 8: the thread forming tap with interior cold hole is generally used for blind hole, l5It is made into 0.5P~3P.
The rib number of thread forming tap can be set as odd number and also be set as even number, can be set according to particular technique condition.RkFor rib top
Radius of curvature can be made according to different workpiece materials to adjust.5 for oil groove can also clamping rose reamer, thread forming tap can be set
Oil groove can also be not provided with oil groove.
Thread forming tap of the invention and previous thread forming tap molding internal screw thread tooth form comparison, previous thread forming tap molding
Internal screw thread tooth bottom occur lack seam and burr, thread forming tap of the invention molding internal screw thread tooth bottom eliminated scarce seam, nothing
Burr, tooth bottom circular arc is smooth to be connect with two facings.
Being threadedly coupled intensity is the intensity of the rotation rate and thread by workpiece material and threaded connection to guarantee.
The internal screw thread of the existing 60 ° of angular threads of the present invention (half of thread angle is 30 °) connection does not make R circle to tooth bottom at path
Arc requirement.
The present invention, which provides one kind, can eliminate scarce seam and burr, and can relatively be precisely controlled the extruding silk of threaded engagement rate
Cone.In the screw tap tooth form of 60 ° of thread form angles, when it is P that screw thread original triangle height, which is H screw pitch, thread forming tap is calibrated into portion
Divide (such as Fig. 5) form of thread to be set to: the flat-top straight line of thread crest cuts height as close possible to H/8 (such as Fig. 2) as low as it.
Circular arc tooth bottom cuts height h at diameter of thread2Shallow arrive is no more than H/4, if cutting height h2More than H/4, threaded engagement rate δ
It will be less than 80%, reduce screw strength, and be unfavorable for the formation of internal screw thread path tooth bottom R circular arc.Cut height h2It is no more than
H/4 can be obtained threaded engagement rate δ and be more than 80% internal screw thread, and be conducive to the formation of internal screw thread path tooth bottom R circular arc, obtain
High-intensitive screw thread.And with predetermined size (b) decline from H/4, with h2Value is the tooth bottom r that radius makees seamless impulse- free robustness thread forming tap
Circular arc (in 60 ° of angular thread tooth forms r=h2), and it is tangent (see Fig. 3) with two facings.Crimping section (l5) thread crest circular arc
Points of tangency with facing, (see Fig. 4), and is gradually reduced the diameter of thread of screw tap crimping section front end at H/8, small to arrive
The circular arc crest diameter dimension of screw tap is less than tapping bottom outlet size.Predetermined size (b) is 5 μm~45 μm.
Example
Unleaded copper nut, material HB159-1.5Q/NPWZ004, screw thread specification M1*0.25, reach 2.8mm are wanted
Seek to obtain 88% threaded engagement rate, existing technique is with previous thread forming tap tapping, and tapping bottom outlet size 0.88mm makes small
Diameter is swollen to the path size less than threaded engagement rate 88%, and then bore hole removal lacks seam again and burr reaches threaded engagement rate
88% size, but the junction in the screw thread withdrawing face and tooth bottom when bore hole still generates burr, 40 power microscopes as it can be seen that
Tapping difficulty is increased, screw tap service life is reduced, influences Screw assembly.
Inventor is as follows with seamless impulse- free robustness thread forming tap test result: the threaded engagement rate (δ) 88% that will be required substitutes into
Formula r=(7-5 δ) P/ (16cos α)=0.0469mm controls thread forming tap tooth bottom r circular arc in r=0.0469mm, tolerance+
0.005mm, sufficiently, when tapping, is very smooth for lubricating oil supply, directly obtains 88% threaded engagement rate.General machining internal thread,
Chamfering is required in screw thread inlet and exit, chamfering has and also has after tapping before tapping, seamless impulse- free robustness thread forming tap
Internal screw thread is made, chamfering needs to arrange after tapping, and otherwise the spiral shell of the cutting direction of rose reamer and screw thread is on the contrary, be easy out
Existing penetration of a cutting tool phenomenon, depth of chamfering need to reach 1P~1.25P, when removing at internal screw thread entrance and exit due to squeezing, be squeezed into
The not full of the internal screw thread path tooth bottom of type is formed by defect, can be obtained after chamfering close to perfect internal screw thread.At 100 times
Burr is had no under microscope at internal screw thread path and lacks seam.Using seamless impulse- free robustness thread forming tap, reduce manufacturing procedure,
Production efficiency is improved, improves and is threadedly coupled the smooth of intensity and Screw assembly.
The present invention is not limited to above schemes, without departing from the spirit and scope of the present invention, can carry out: 1. screw pitch (P)
Or 2. half of thread angle (α) or the 3. various changes such as change of threaded engagement rate (δ).
Seamless impulse- free robustness thread forming tap is because effectively control the tooth bottom r circular arc at diameter of thread, available continuous, light
Sliding path tooth bottom R circular arc internal screw thread, and it is made to connect to form smooth curve with facing, tooth bottom arc sections when threaded engagement
Dividing plays the role of guiding, has guided and has screwed with externally threaded, is better than flat screw thread, more conducively Screw assembly.Solve previous squeeze
The burr of silk pressing cone molding internal screw thread and scarce seam problem, it is excellent better than cutting forming screw thread to embody extrusion forming screw thread
The intensity and quality of threaded connection greatly improved in point, improves internal screw thread production efficiency, and the screw thread of more adaptation high request connects
It connects, such as: field of traffic, IT industry, the occasion that the needs such as industrial automation assembly line are threadedly coupled.
The stress that thread forming tap tooth bottom is made into the wedge angle for also improving screw-tap threaded tooth bottom of regulation circular arc is concentrated, and is enhanced
The intensity of thread forming tap, and the grinding allowance of thread forming tap processing is reduced, improve processing efficiency.
It can by the bottom outlet size before the tooth bottom R circular arc and control work-piece tapping of the seamless impulse- free robustness thread forming tap of strict control
To obtain the tooth bottom R circular arc of comparatively ideal angular thread internal screw thread, the extruding for having effectively eliminated internal screw thread tooth bottom lacks seam, and keeps away
The burr at internal screw thread tooth bottom is exempted from.
For this case disclosure of that, need to illustrate there are also the following:
(1), this case the disclosed embodiments attached drawing relate only to structure involved by this case disclosed embodiment,
His structure, which can refer to, to be commonly designed；
(2), in the absence of conflict, the feature in this case the disclosed embodiments and embodiment can be combined with each other with
Obtain new embodiment；
More than, only specific embodiment disclosed in this case, but the protection scope of the disclosure is not limited thereto, this case
Disclosed protection scope should be subject to the protection scope in claims.
Claims (6)
1. a kind of seamless impulse- free robustness thread forming tap, including shank and threaded portion, the threaded portion include crimping section and calibration portion
Point, which is characterized in that the half of thread angle in the calibration portion is α, and the tooth form threaded engagement rate in the calibration portion is δ, threaded portion
Screw pitch is P；The radius of curvature at the tooth bottom of threaded portion is r；Radius of curvature r=(7-5 δ) P/ (16cos α)；
The screw thread original triangle height in the calibration portion is H, and the flat-top straight line of calibration portion crest cuts height as low as it
Using H/8 as the limit, circular arc tooth bottom cuts height h at diameter of thread2Less than H/4, and with predetermined size (b) decline from H/4.
2. a kind of seamless impulse- free robustness thread forming tap described in claim 1, which is characterized in that the predetermined size (b) be 5 μm~
45μm。
3. a kind of seamless impulse- free robustness thread forming tap according to claim 1, which is characterized in that the thread form angle in the calibration portion
It is 60 °, circular arc tooth bottom cuts height h at the radius of curvature r and diameter of thread at the tooth bottom2It is equal.
4. a kind of seamless impulse- free robustness thread forming tap according to claim 1, which is characterized in that the thread of the press section
Top is in arc surface (r1)。
5. a kind of seamless impulse- free robustness thread forming tap according to claim 1, which is characterized in that the crimping section (l5)
Reach is 0.5P-25P.
6. utilizing a kind of internal screw thread of seamless impulse- free robustness thread forming tap production described in claim 1, which is characterized in that in described
The path crest of screw thread is in the arc surface of continuous closed state or in slit state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910106753.3A CN109648022B (en) | 2019-02-02 | 2019-02-02 | Seamless burr-free extrusion tap and internal thread manufactured by same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910106753.3A CN109648022B (en) | 2019-02-02 | 2019-02-02 | Seamless burr-free extrusion tap and internal thread manufactured by same |
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| CN109648022A true CN109648022A (en) | 2019-04-19 |
| CN109648022B CN109648022B (en) | 2024-01-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111015117A (en) * | 2019-12-25 | 2020-04-17 | 重庆跃进机械厂有限公司 | Machining method for bearing bush groove of marine engine |
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|---|---|---|---|---|
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| JPS4813902B1 (en) * | 1969-12-17 | 1973-05-01 | ||
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