CN105344898A - One-time thread-rolling molding method and mold for bobtail rivet - Google Patents
One-time thread-rolling molding method and mold for bobtail rivet Download PDFInfo
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- CN105344898A CN105344898A CN201510937948.4A CN201510937948A CN105344898A CN 105344898 A CN105344898 A CN 105344898A CN 201510937948 A CN201510937948 A CN 201510937948A CN 105344898 A CN105344898 A CN 105344898A
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- 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
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
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Abstract
The invention discloses a one-time thread-rolling molding method and a mold for a bobtail rivet. A movable die and a fixed die on a thread rolling machine both comprises a locking die, a thread die and a tail tooth die from top to bottom; the lengths of front-most ends of the three dies satisfy that L3 is larger than L1 and smaller than L2; the entrance angles of the two side surfaces satisfy that alpha 3 is larger than alpha 1 and smaller than alpha 2; the maximal die widths are Y1, Y2 and Y3, and Y3 is not smaller than Y2; a stripping angle beta is formed at the tail end; the die height at each section is not smaller than the lengths of a locking section, a thread section and tail teeth; the front end of the thread die has a small plane, an upper chamfer angle and a lead angle, and an acute angle is removed from a maximal die width position; during thread rolling, a blank is extruded between the movable die and the fixed die and moves backwards along the axial direction of the movable die; the locking section, the tail teeth and the thread section are sequentially extruded within the length of the entrance angle; when the blank enters the position of length L2, a complete three-section screw thread is to be vertically molded; all circumferential and vertical screw thread molding is finished until the blank moves to front of a stripping bevel. The efficiency of the one-time thread-rolling molding method disclosed by the invention is improved by 20 times or more in comparison with that of the prior art of 1 or 3 thread rollers; the one-time thread-rolling molding method is capable of saving time, saving force and saving work, has the optimal performances of good machining location, no cracking of thread teeth, no burrs at joints and the like and can satisfy large-batch production requirements.
Description
(1) technical field: the processing screw thread technology that the present invention relates to a kind of securing member pulling rivet.Belong to intermetallic composite coating slotting class (B23D).
(2) background technology:
Existing short-tail rivet finished product 5 on railroad train, automobile, its profile is shown in Fig. 1, nail bar has three sections of screw threads from top to bottom: rivet with the collar 5.4 the locking section 5.1, thread segment 5.2, the tail tooth 5.3 that extrude and lock.In Fig. 1, ailhead is 5.5, is 5.6 by riveted plating, riveting machine claw 5.7, riveting machine overcoat 5.8.Thread segment rear end face is taper seat 5.21, and during riveted joint during riveting machine claw clamping rivet point tooth, taper seat 5.21 is located for claw.Also locate for claw 5.31 sections, tail tooth upper end.Slightly wide at the bottom of the 5.31 sections of teeth in general tail tooth upper end, referred to herein as section 5.31 at the bottom of the wide tooth of tail tooth.Such as: rivet specification 16mm, widen 0.15mm at the bottom of tooth, now at the bottom of the wide tooth of tail tooth, section 5.31 length is 4.67 ± 0.15.Different model product size is provided by design drawing.
Existing short-tail rivet screw thread shapes method two kinds: 1) establish San Tai Roll silk machine: First fills tail tooth thread rolling die, the second platform fills screw thread thread rolling die, the 3rd platform fills locking slot thread rolling die; Operate throwing tail tooth → throwing screw thread → throwing locking slot respectively by 3 people, 3 people are responsible for every section of rolled thread and change station disassemble and assemble work simultaneously.2) Yi Tai Roll silk machine is established, 3 secondary thread rolling dies: by 1 people's disassembling, assembling and replacing thread rolling die 3 times, process 3 times: throwing tail tooth → throwing screw thread → throwing locking slot completes three sections of rolled thread processing.Such forming technology is time-consuming, require great effort, take a lot of work, efficiency is low, and hold facility is many, cannot meet production demand.
(3) summary of the invention:
Short-tail rivet provided by the invention thread rolling forming method and mould, its objective is solve short-tail rivet existing screw thread forming technology time-consuming, require great effort, take a lot of work, the low problem that cannot meet production demand of efficiency.
Technical scheme is as follows:
Short-tail rivet thread rolling forming method, comprising: the dynamic model in thread rolling machine, cover half, workpiece position, feeding guide, material-pulling device; It is characterized in that: have the following steps:
1) dynamic model 6 or cover half 7 all have identical the locking mould, die and the tail tooth mould that connect in turn from top to bottom:
Locking mould 1: long L foremost
1interior two sides angle is that locking imports angle α
1.Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
1, Z1 is equal with the locking segment length L5.1 of short-tail rivet 5 for height.
Die 2: long L foremost
2interior two sides angle is that screw thread imports angle α
2.Two sides highest point has facet 2.1, has upper chamfering 2.2; Die has lead angle θ, and die rearmost end two sides angle is de-material angle β; Die is the widest is the screw thread Mould Breadth Y of middle-end
2, and have the seamed edge removing acute angle; Die height Z
2equal thread segment length L5.2 and the facet 2.1 height h2.1 sum of short-tail rivet.
Tail tooth mould 3: long L foremost
3interior two sides angle is that tail tooth imports angle α
3; Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
3; Tail tooth mould height Z3 is greater than the tail dental length L2.3 of short-tail rivet; Processing tooth 3.1 at the bottom of the wide tooth of band chamfering is established in tail tooth mould upper end.
Above-mentioned α
1< α
3< α
2; L
1< L
3< L
2;
2) pre-install: the dynamic model after above-mentioned connection or cover half be arranged on respectively the dynamic plate side of both sides, workpiece position 8.1 in thread rolling machine 8 and determine plate side, debug and fix mould.
3) thread rolling 1 step: start thread rolling machine, dynamic model is along X shift-in cutter forward, and the counter-clockwise rotation of rivet blank 4, first squeezes out rivet blank locking section 4.1 in the length L1 scope class importing angle, secondly extruding tail tooth 4.3, last thread-rolling screw section 4.2.
4) thread rolling 2 step and shaping:
Dynamic model, along X to continuation reach feed, moves after semi-finished product rivet blank and imports on angular length degree L2 end position B at dynamic model, start extruding from here and reach depth capacity, start vertical shaping complete locking section, tail tooth, thread segment screw thread; Until to de-material front position, inclined-plane C, in this section, arc length 4a circumference reach after thread rolling; Dynamic model continues feed extruding, makes the rivet blank in Zhou Xianghou mono-section of arc length 4b be shaped to upper, middle and lower three sections of screw threads 5.1,5.2,5.3, completes the vertical all screw thread moldings of circumference, carry out integer subsequently in a girth.
5) de-material: dynamic model continues in X direction to moving forward to dynamic model de-material inclined-plane 6.1 and cover half de-material inclined-plane 7.1 place, and the gap between dynamic model, cover half increases gradually, until workpiece comes off.
For realizing the mould needed for above-mentioned short-tail rivet thread rolling forming method, it is characterized in that and <1 in above-mentioned short-tail rivet thread rolling forming method) dynamic model 6 or cover half 7 all have identical locking mould, the die connected in turn from top to bottom identical with Expressive Features in tail tooth mould >, no longer repeat here.
Above-mentioned Design of Moulds optimization range is as follows:
α
1≤0.5°、α
2≤1.5°、α
3≤1.5°。Y
3≮Y
2。Facet height h2.1=(0.3 ~ 1) mm.Upper chamfering 2.2=0.5 × 45 °.Lead angle θ=arctanP/ π d, in formula, d is selected major diameter of thread, and P is selected tooth distance.De-material angle β gets 10 °.
Beneficial effect of the present invention:
1) existing throwing tail tooth → throwing screw thread → throwing locking slot three technique, each rolled thread process need about 10 seconds, completing a short-tail rivet at least needs 30 seconds, within 1 minute, can only process 2.The present invention's thread rolling is shaping, within 1 minute, can process more than 40, working (machining) efficiency improve 20 times and more than.
2) one-shot forming thread rolling process operator labour intensity of the present invention is little, and pilot process does not have the de-material of workpiece, changes station, refills the operations such as folder and time, saves time, laborsaving, saving of labor.
3) thread rolling mould parameter designing of the present invention adopts α 1 < α 3 < α 2; L1 < L3 < L2, the importing length L1 in the locking mould 1 of namely first shaping rivet locking section screw thread is the shortest, imports angle α 1 minimum (see Fig. 4), ensures shaping locking section 5.1 at first, can locate in advance.Such design make workpiece enter start to extrude in mould time, guarantee can not have a down dip at self gravitation, causes random button.Though it is simultaneously extruded that the present invention is the dissimilar screw thread of a workpiece upper, middle and lower three kinds, if the length of mould and highly permission, may be used for realizing more eurypalynous screw thread by the present invention's thread rolling technology simultaneously extruded.
4) thread rolling mould parameter designing adopts Y3 ≮ Y2, and tail tooth mould 3 is played a supportive role, and can prevent screw thread in processing from collapsing tooth.
5) die: establish screw thread Mould Breadth to remove acute angle seamed edge, can prevent screw thread in processing from collapsing tooth.If facet 2.1, ensure locking section 5.1 and thread segment 5.2 joining place impulse-free robustness.If upper chamfering 2.2 can prevent screw thread edge screw thread in processing from collapsing tooth.Lead angle θ ensures to process thread segment (θ is provided by product drawing size).
6) there is processing tooth 3.1 (see Figure 12) at the bottom of the wide tooth of band chamfering tail tooth mould upper end, can process section 5.31 at the bottom of the wide tooth of thread segment lower end taper seat 5.21 and tail tooth upper end, in order to ensure riveting machine claw location (see Fig. 1).
(4) accompanying drawing illustrates:
Short-tail rivet finished product 5 front view after Fig. 1 riveted joint.
Fig. 2 dynamic model 6 or cover half 7 assemble schematic diagram (depicting workpiece short-tail rivet blank 4 in figure).
Fig. 3 is the B-B sectional view in Fig. 2.(Z-Y face)
Fig. 4 is the A in Fig. 2
1-A
1sectional view, namely locks mould 1 top view (X-Y plane).
Fig. 5 is the vertical view cutaway drawing (X-Y plane) of blank 4 before importing angular length degree end position B in Fig. 2.
Fig. 6 be in Fig. 2 blank 4 having extruded the vertical view cutaway drawing (X-Y plane) before waiting to enter de-material incline position C.
Fig. 7 is the A in Fig. 2
2-A
2sectional view, i.e. die 2 top view (X-Y plane).(at importing angular length degree extrusion position)
Fig. 8 is the M direction view in Fig. 7.I.e. die 2 front view (Z-X face).
Fig. 9 is local I enlarged drawing in Fig. 8.I.e. die 2 front view (Z-X face) foremost.
Figure 10 is N direction view in Fig. 9.I.e. die 2 end view (Z-Y face) foremost.
Figure 11 is the A in Fig. 2
3-A
3sectional view, i.e. tail tooth mould 3 top view (X-Y plane) (at importing angular length degree extrusion position).
Figure 12 is N direction view in Figure 11.I.e. tail tooth mould 3 end view (Z-Y face) foremost.
Figure 13 thread rolling machine 8 top view (X-Y plane).Comprise dynamic model, cover half, feeding guide, feeding device etc.
Figure 14 is local II enlarged drawing in Figure 13.
(5) detailed description of the invention:
The present embodiment short-tail rivet thread rolling forming method,
Comprise and see Figure 13, thread rolling machine 8 is provided with the dynamic model 6 and cover half 7 arranged along Y-direction, and spacing is between the two workpiece position 8.1.Dynamic model is driven by the connecting rod 8.2 that flywheel is housed and moves relative to cover half in X direction.Cover half lock-screw is fixed on thread rolling machine 8 base.See Figure 13,14, set oblique feeding guide 8.4 in porch, workpiece position 8.1, it discharges short-tail rivet blank 4.See Figure 14, there is the material-pulling device of pushing sheet 8.5 and backgauge sheet 8.6 feeding guide 8.4 front end.It is characterized in that having the following steps:
1) see Fig. 2, dynamic model 6 or cover half 7 all have identical the locking mould 1, die 2 and the tail tooth mould 3 that are connected and fixed in turn from top to bottom.
Locking mould 1: see Fig. 4, foremost long L
1interior two sides angle is that locking imports angle α
1.Rearmost end two sides angle is de-material angle β.The widest is locking Mould Breadth Y
1(Y
1fig. 3 can be seen) simultaneously.See the locking segment length L of short-tail rivet 5 in height Z1 and Fig. 1 in Fig. 2
5.1equal.
Die 2: see Fig. 7, foremost long L
2interior two sides angle is that screw thread imports angle α
2.See Figure 10, Fig. 9, two sides highest point has facet 2.1, has upper chamfering 2.2.See Fig. 9, die has lead angle θ, and namely between cross-section center line horizontal plane and bottom surface, variable angle is lead angle θ in X direction, in order to realize processing screw thread.See Fig. 7, die rearmost end two sides angle is de-material angle β.See Fig. 7, Fig. 3, die is the widest is the screw thread Mould Breadth Y of middle-end
2, have the seamed edge removing acute angle, and screw thread is more close to lower surface, more sharply, intensity is lower.More need to remove sharp edge.See die height Z in Fig. 2
2equal the thread segment length L of short-tail rivet in Fig. 1
5.2with facet in Figure 10 2.1 height h2.1 sum, i.e. Z
2=L
5.2+ h2.1.
Tail tooth mould 3: see Figure 11, foremost long L
3interior two sides angle is that tail tooth imports angle α
3; Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
3(Y
3fig. 3 can be seen) simultaneously.See that in Fig. 2, tail tooth mould height Z3 is greater than the tail dental length L2.3 of short-tail rivet in Fig. 1.If tail tooth mould height is too low, heat treatment can be out of shape, and intensity is also not enough.See Fig. 1, tail tooth 5.3 has section 5.31 at the bottom of the wide tooth of tail tooth also to locate for riveting machine claw topmost.See Figure 12, tail tooth mould 3 upper end is provided with processing tooth 3.1 at the bottom of the wide tooth of band chamfering, just can squeeze out section 5.31 (see Fig. 1) at the bottom of taper seat 5.21 and the wide tooth of tail tooth.
Above-mentioned α
1< α
3< α
2; L
1< L
3< L
2(see Fig. 4, Fig. 7 and Figure 11).
2) pre-install:
Locking mould 1 in Fig. 4, Fig. 7, Figure 11, die 2 and tail tooth mould 3 are filled from top to bottom in turn as the dynamic model 6 in Fig. 2, Fig. 3 or cover half 7, and during thread rolling machine 8 is in fig. 13 installed respectively both sides, workpiece position 8.1 dynamic plate side and determine plate side, debug and fix mould.
Feeding process: see Figure 13, workpiece 4 transfers to gradient guide rail 8.4 through thread rolling machine 8 feed mechanism, and workpiece is reach under deadweight, by feeding tooth on guide rail one by one feeding to backgauge sheet 8.6, when dynamic model 6 move to cover half 7 import port part time, pushing sheet 8.5 synchronization action, pushes working position 8.1 workpiece.
3) thread rolling 1 step:
See Fig. 4, dynamic model 6 along X shift-in cutter forward, the counter-clockwise rotation of rivet blank 4, importing the length L1 at angle, L2, L3 scope class first to extrude in Fig. 2 rivet blank 4 section of locking 4.1 (because L1 is the shortest, α 1 is minimum), secondly extruding blank tail tooth 4.3, finally extrudes blank thread segment 4.2.
4) thread rolling 2 step and shaping:
See Fig. 5, Fig. 6, dynamic model 6, along X to continuation reach feed, moves after semi-finished product blank 4 and imports on angular length degree L2 end position B at dynamic model 6, starts the extruding of all screw threads from here and reaches depth capacity, starts vertical shaping complete screw thread locking, screw thread, tail tooth; Until to Fig. 6 de-material front position, inclined-plane C, in this section, semi-finished product blank 4 continues counter-clockwise rotation, arc length 4a circumference reach after thread rolling; Dynamic model 6, along X to continuation reach feed extruding, makes the blank in Zhou Xianghou mono-section of arc length 4b be shaped to upper, middle and lower three sections of screw threads 5.1,5.2,5.3 (see Fig. 1), in a girth, namely completes the vertical all screw thread moldings of circumference, carry out integer subsequently.
5) de-material: see Fig. 6, dynamic model 6 continues in X direction to moving forward to dynamic model de-material inclined-plane 6.1 and cover half de-material inclined-plane 7.1 place, and because there being the existence at de-material angle, the gap between dynamic model, cover half increases gradually, until workpiece comes off.
The present embodiment realizes the mould needed for above-mentioned short-tail rivet thread rolling forming method, comprising:
See Fig. 2, dynamic model 6 or cover half 7 all have identical the locking mould 1, die 2 and the tail tooth mould 3 that are connected and fixed in turn from top to bottom.
Locking mould 1: see Fig. 4, foremost long L
1interior two sides angle is that locking imports angle α
1.Rearmost end two sides angle is de-material angle β.The widest is locking Mould Breadth Y
1(Y
1fig. 3 can be seen) simultaneously.See that the locking segment length L5.1 of short-tail rivet 5 in height Z1 and Fig. 1 in Fig. 2 is equal.
Die 2: see Fig. 7, foremost long L
2interior two sides angle is that screw thread imports angle α
2.See Figure 10, Fig. 9, two sides highest point has facet 2.1, has upper chamfering 2.2.See Fig. 9, die has lead angle θ, and namely between cross-section center line horizontal plane and bottom surface, variable angle is lead angle θ in X direction, in order to realize processing screw thread.See Fig. 7, die rearmost end two sides angle is de-material angle β.See Fig. 7, Fig. 3, die is the widest is the screw thread Mould Breadth Y of middle-end
2, have the seamed edge removing acute angle, and screw thread is more close to lower surface, more sharply, intensity is lower.More need to remove sharp edge.See die height Z in Fig. 2
2equal the thread segment length L of short-tail rivet in Fig. 1
5.2with facet in Figure 10 2.1 height h2.1 sum, i.e. Z
2=L
5.2+ h2.1.
Tail tooth mould 3: see Figure 11, foremost long L
3interior two sides angle is that tail tooth imports angle α
3; Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
3(Y
3fig. 3 can be seen) simultaneously.See that in Fig. 2, tail tooth mould height Z3 is greater than the tail dental length L of short-tail rivet in Fig. 1
2.3.If tail tooth mould height is too low, heat treatment can be out of shape, and intensity is also not enough.See Fig. 1, tail tooth 5.3 has section 5.31 at the bottom of the wide tooth of tail tooth also to locate for riveting machine claw topmost.See Figure 12, tail tooth mould 3 upper end is provided with processing tooth 3.1 at the bottom of the wide tooth of band chamfering, just can squeeze out section 5.31 (see Fig. 1) at the bottom of taper seat 5.21 and the wide tooth of tail tooth.
Above-mentioned design parameter value condition and scope as follows:
Above-mentioned α
1< α
3< α
2; L
1< L
3< L
2(see Fig. 4, Fig. 7 and Figure 11).
α
1≤0.5°、α
2≤1.5°、α
3≤1.5°。(see Fig. 4, Fig. 7 and Figure 11)
Y
3≮ Y
2; (see Fig. 3).Facet height h2.1=(0.3 ~ 1) mm.(see Figure 10).
Upper chamfering 2.2=0.5 × 45 °; (see Figure 10).
Lead angle θ=arctanP/ π d, in formula, d is selected major diameter of thread, and P is selected tooth distance.(see Fig. 9)
De-material angle β gets 10 °.(see Fig. 4, Fig. 7 and Figure 11) angle is larger, and de-material stroke is shorter.
L
1, L
2, L
3length is chosen by dynamic model 6 or cover half 7 overall length.Y
1, Y
2, Y
3width is arranged by thread rolling machine 8 width and is chosen.
Claims (3)
1. short-tail rivet thread rolling forming method, comprising: the dynamic model in thread rolling machine, cover half, workpiece position, feeding guide, material-pulling device; It is characterized in that: comprise the steps:
1) described dynamic model (6) or cover half (7) all have identical the locking mould, die and the tail tooth mould that connect in turn from top to bottom;
Locking mould (1): long L foremost
1interior two sides angle is that locking imports angle α
1.Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
1, the locking segment length L of height Z1 and short-tail rivet (5)
5.1equal;
Die (2): long L foremost
2interior two sides angle is that screw thread imports angle α
2.Two sides highest point has facet (2.1), has upper chamfering (2.2); Die has lead angle θ, and die rearmost end two sides angle is de-material angle β; Die is the widest is the screw thread Mould Breadth Y of middle-end
2, and have the seamed edge removing acute angle; Die height Z
2equal the thread segment length L of short-tail rivet
5.2with facet (2.1) height h2.1 sum;
Tail tooth mould (3): long L foremost
3interior two sides angle is that tail tooth imports angle α
3; Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
3; Tail tooth mould height Z3 is greater than the tail dental length L of short-tail rivet
2.3; Processing tooth (3.1) at the bottom of the wide tooth of band chamfering is established in tail tooth mould upper end;
Above-mentioned α
1< α
3< α
2; L
1< L
3< L
2;
2) pre-install: the dynamic model after above-mentioned connection or cover half be arranged on respectively the dynamic plate side of workpiece position (8.1) both sides in thread rolling machine (8) and determine plate side, debug and fix mould;
3) thread rolling 1 step: start thread rolling machine, dynamic model is along X shift-in cutter forward, rivet blank (4) counter-clockwise rotation, rivet blank locking section (4.1) is first squeezed out in the length L1 scope class importing angle, secondly extruding tail tooth (4.3), last thread-rolling screw section (4.2).
4) thread rolling 2 step and shaping: dynamic model is along X to continuation reach feed, move after semi-finished product rivet blank and import on angular length degree L2 end position B at dynamic model, start extruding from here and reach depth capacity, start vertical shaping complete locking section, tail tooth, thread segment screw thread; Until to de-material front position, inclined-plane C, in this section, arc length (4a) circumference reach after thread rolling; Dynamic model continues feed extruding, makes the rivet blank in Zhou Xianghou mono-section of arc length (4b) be shaped to upper, middle and lower three sections of screw threads (5.1,5.2,5.3), completes the vertical all screw thread moldings of circumference, carry out integer subsequently in a girth.
5) de-material: dynamic model continues in X direction to moving forward to dynamic model de-material inclined-plane (6.1) and cover half de-material inclined-plane (7.1) place, and the gap between dynamic model, cover half increases gradually, until workpiece comes off.
2. die needed for realizing the thread rolling forming method of short-tail rivet belonging to claim 1, comprising: the dynamic model in thread rolling machine, cover half, workpiece position, feeding guide, material-pulling device; It is characterized in that:
Described dynamic model (6) or cover half (7) all have identical the locking mould, die and the tail tooth mould that connect in turn from top to bottom;
Locking mould (1): long L foremost
1interior two sides angle is that locking imports angle α
1.Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
1, the locking segment length L of height Z1 and short-tail rivet (5)
5.1equal;
Die (2): long L foremost
2interior two sides angle is that screw thread imports angle α
2.Two sides highest point has facet (2.1), has upper chamfering (2.2); Die has lead angle θ, and die rearmost end two sides angle is de-material angle β; Die is the widest is the screw thread Mould Breadth Y of middle-end
2, and have the seamed edge removing acute angle; Die height Z
2equal the thread segment length L of short-tail rivet
5.2with facet (2.1) height h2.1 sum;
Tail tooth mould (3): long L foremost
3interior two sides angle is that tail tooth imports angle α
3; Rearmost end two sides angle is de-material angle β; The widest is locking Mould Breadth Y
3; Tail tooth mould height Z3 is greater than the tail dental length L of short-tail rivet
2.3; Processing tooth (3.1) at the bottom of the wide tooth of band chamfering is established in tail tooth mould upper end;
Above-mentioned α
1< α
3< α
2; L
1< L
3< L
2.
3., by short-tail rivet thread rolling mould belonging to claim 2, it is characterized in that: described design parameter value condition and scope as follows:
α
1≤0.5°、α
2≤1.5°、α
3≤1.5°；Y
3≮Y
2；
Facet height h2.1=(0.3 ~ 1) mm; Upper chamfering 2.2=0.5 × 45 °;
Lead angle θ=arctanP/ π d, in formula, d is selected major diameter of thread, and P is selected tooth distance;
De-material angle β gets 10 °.
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI595941B (en) * | 2016-03-18 | 2017-08-21 | 三秀股份有限公司 | Rolling flat die for screw component and rolling process method |
| CN112916773A (en) * | 2021-01-23 | 2021-06-08 | 上海奥达科股份有限公司 | Manufacturing method of composite tooth shape of blind rivet |
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| JPS6233035A (en) * | 1985-08-05 | 1987-02-13 | Toyota Motor Corp | Odd-shaped screw and its manufacture |
| JPS63149033A (en) * | 1986-12-12 | 1988-06-21 | Toyota Motor Corp | Thread rolling method |
| JPH1029030A (en) * | 1996-07-15 | 1998-02-03 | Minebea Co Ltd | Flat die for form rolling of screw |
| JP3673946B2 (en) * | 2002-04-24 | 2005-07-20 | 株式会社浅川製作所 | Thread rolling dies |
| CN201136035Y (en) * | 2007-12-19 | 2008-10-22 | 舟山市7412工厂 | Ring-patterned credit cards at shank of blind rivet |
| CN203778664U (en) * | 2013-01-16 | 2014-08-20 | 易连工业股份有限公司 | Combined tooth plate die |
| CN104668414A (en) * | 2015-02-06 | 2015-06-03 | 舟山市7412工厂 | Forming method for locking thread |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI595941B (en) * | 2016-03-18 | 2017-08-21 | 三秀股份有限公司 | Rolling flat die for screw component and rolling process method |
| CN112916773A (en) * | 2021-01-23 | 2021-06-08 | 上海奥达科股份有限公司 | Manufacturing method of composite tooth shape of blind rivet |
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| CN105344898B (en) | 2017-02-01 |
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