CN1031339A - Die-revolving high-speed cold header with multiple working positions - Google Patents
Die-revolving high-speed cold header with multiple working positions Download PDFInfo
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Abstract
The present invention relates to particularly die-revolving high-speed cold headers of cold headers.
The present invention provides the die more than at least three on revolution die socket (3), will adorn and the same number of punch die corresponding with the die of die socket on the slide block (107); The guiding mechanism of regulating product length is made of regulating sleeve (108), ring washer (16) and adjusting nut (15), is used for unifying to regulate the length of product; The present invention simultaneously is application space cam mechanism on cold headers at first; drive cavity die rotating dress (2) and do the intermittent-rotation motion; to realize the transposition between the cold headers multiple operation, enlarged the processing range of cold headers like this, solved the unsolved for a long time technical barrier of cold-heading industry.
Description
The present invention relates to particularly die-revolving high-speed cold header with multiple working positions of cold headers.The present invention provides at least three with the corresponding with it punch die of upper cavity die on revolution die die holder, the present invention simultaneously is at first at cold-heading application space cam mechanism mechanically, successfully make the die device do intermittent movement, to realize the transposition between the cold headers multiple operation, enlarge the processing range of cold headers like this, solved the unsolved for a long time technical barrier of cold-heading industry.
At present, in order to satisfy the needs of cold headers processes, usually the cold headers that manufacture and design have various forms, these cold headers commonly used problem structurally is well-known, their die all is to be fixed on the fuselage, and the transposition of inter process is realized by drift inversion mechanism and clamp inversion mechanism.External in recent years many producers are novel cold-heading machinery for the user has manufactured and designed; for example: the cold nail hitting head machinery of the two-stroke that West Germany Xi Gelan company produces HC is exactly best a kind of of performance; though this machine also adopts the cavity die rotating device, the rotation of cavity die rotating device is to rely on rack-and-pinion to realize.When the gears engaged of tooth bar and cavity die rotating device; driving the cavity die rotating device rotates; when being out of gear of tooth bar and cavity die rotating device, the cavity die rotating device just stops operating, and is limited in the fixing angle cavity die rotating device motionless by the alignment pin in the detent mechanism again simultaneously.After the system of upsetting finished, alignment pin withdrawed from from the locating hole of cavity die rotating device, this hour rack again with the gears engaged of cavity die rotating device, repeat the action of front.Under high-speed case, the engagement repeatedly of rack and pinion and the insertion repeatedly of alignment pin and pin-and-hole are withdrawed from generation bump, vibration and noise; Again because the wearing and tearing of these two kinematic pairs, the precision and the service life of reducing machine.Secondly; the cold nail hitting head machinery of the two-stroke that uncommon Glan company produces HC; on the rotation die holder, three dies have been installed; two punch dies have been installed on slide block; this double cavity die rotating cold headers make the work piece system secondary of can only upsetting; therefore the system of can not upsetting leading edge deformation amount reaches bar portion short bolt, rivet and other forming part greatly.Once more, the cold nail hitting head machinery of the two-stroke that Xi Gelan company produces HC, to adjusting respectively of goods bar length in the die, this structure was both inconvenient, also inaccurate when adjusting, and influenced the quality of product.
Free-revving engine of the present invention provides a kind of new construction die-revolving high-speed cold header with multiple working positions; a plurality of dies can be set on the die socket of cavity die rotating device make a product, the short product of the system leading edge deformation amount of can upsetting so big bar portion to realize that multiple working procedure is upset.
Another object of the present invention is that successfully the usage space cam mechanism is controlled the intermittent movement of cavity die rotating device, so the motion of cavity die rotating device steadily, and calibration is accurate, and the location is reliable and do not have and impact etc., improves the precision and the productivity ratio of product.
Another purpose of the present invention provides a kind of guiding mechanism of adjusting goods bar length in the die, and this guiding mechanism can guarantee the precision of product, and makes things convenient for when adjusting, saves time, accurately.
Main points of the present invention are: on die socket with same garden week each other with a uniform n hole, isogonism gap (at least three), n die can be installed in the hole; There is a stressed disk die socket back; One is used for die socket by bearing and the geared sleeve that the fuselage hole is connected, stressed disk, and the connecting axle that links together of geared sleeve; A governor motion that is used for regulating product length.The uniform ejector beam group corresponding in die and governor motion with the die hole.Interrupted division mechanism comprises a driving shaft; A space cam that is enclosed within the middle of the driving shaft, both ends of main drive shaft is bearing in the bearing block of nowel; In the driven shaft two supports top box bearing block; The uniform several rollers of equi-angularly space (pocket-wheel) on the driven shaft circumference, roller is meshed with space cam in turn.
On high-speed cold heading machine the application space cam as interrupted division mechanism for following consideration: driving shaft and the driven shaft direction that meets at right angles is done radial embedding.Therefore, the flange surface of cam becomes cone shape, cam is pressed to be attached to form on the driven member pocket-wheel give pressure, can guarantee that like this die is on-stream steadily, accurately; Give and press such mode can eliminate sideshake, therefore can be applied on the high-speed cold heading machine.
The present invention will more clearly be illustrated in the following example.
Drawings and Examples:
Fig. 1 is the high cold headers major opposing side of a multistation cavity die rotating part diagrammatic cross-sectional view.
Fig. 2 is the diagrammatic side views of the cavity die rotating device 2 of the present invention got along the line I-I among Fig. 1.
Fig. 3 is the auspicious figure in cross section of the cavity die rotating device 2 of the present invention got along line II-II of Fig. 2.
Fig. 4 is the auspicious figure in cross section of the interrupted division device 27 of the present invention got along line III-III of Fig. 1.
Fig. 5 is the auspicious figure in cross section of the interrupted division device 27 of the present invention got along line IV-IV of Fig. 4.
Fig. 6 is the main transmission sketch along Fig. 1 line this machine that V-V gets.
Fig. 7 is the auspicious figure of side-looking of the slide block mechanism 86 that VI-VI is got among Fig. 1.
Fig. 8 is the auspicious figure in cross section of the slide block mechanism 86 got along line VII-VII of Fig. 7.
Fig. 9 is the top plan view of the slide block mechanism 86 that VIII-VIII is got among Fig. 8.
As can be seen from Fig. 1, the cavity die rotating device is installed in the hole of fuselage (1), and fuselage (1) is installed on the support (85).From Fig. 1 to Fig. 3 as seen; the geared sleeve (17) of cavity die rotating device (2) is bearing in the two ends in fuselage (1) hole by two bearings (19); connecting axle (4) is with die socket (3), and stressed disk (24) and geared sleeve (17) tighten together by key (23) and nut (5).The external diameter of the regulating sleeve of guiding mechanism (18) cooperates with the hole of geared sleeve (17); Regulating sleeve (18) internal diameter cooperates with connecting axle (4) external diameter, and relatively rotate with key (21) restriction, by ring washer (16) regulating sleeve (18) and adjusting nut (15) are coupled together, can drive regulating sleeve (18) along the axial move left and right of connecting axle (4), the length that adjustable restraining part needs with adjusting nut (15).Three holes of the same even layout of garden week equi-angularly space on the plane of die socket (3), in each hole, respectively load onto die (6), with screw (26) die (6) is securely fixed in die socket (3) hole, in die (6) hole, a material pushing needle (10) is arranged respectively, contact with material pushing needle (10) end face and concentric a connecting rod (11) and knock-pin (14) arranged respectively.The axial location of die socket (3) is realized by ring flange (25) and the stressed disk of backing plate (22) clamping (24).Ring flange (13), spacer (20) and backing plate (22) are fixing needle bearing (19) positions.On ring flange (25) surface, install and cut off die holder (8), in the hole that cuts off die holder (8), load onto knife edge die (7), and fix its position with screw (9).
From Fig. 1 to Fig. 5 as seen, interrupted division device (27) be used for controlling cavity die rotating device (2) at work rotation and stop.Gear (54) on the driven shaft (28) of interrupted division device (27) combines with gear on the geared sleeve (17) of cavity die rotating device (2), makes cavity die rotating device (2) intermittent movement.Installing space cam (38) (Fig. 4 is as one) in the middle of the driving shaft (36) of interrupted division device (27), driving shaft (36) two ends are bearing in the two ends of lower box (32) by bearing (37), (40), and the bevel gear (34) of driving shaft (36) one ends connects by key (35).Driven shaft (28) two ends are bearing in the two ends of upper box (30) by bearing (46), (55), garden Zhou Fangxiang in the middle of the driven shaft (28) goes up the evenly distributed several holes of equi-angularly space (among Fig. 4 being 6), an axle (44) respectively is installed in the hole, upward cooperate with roller (29) endoporus by the needle roller (not shown) at this axle (44), roller (29) is gone up space cam (38) surface with driving shaft (36) in turn and is contacted.Interrupted division device (27) when roller (29) moves to next roller (29), remains with space cam (38) generation and gives pressure at the volley, can eliminate sideshake like this, is suitable at a high speed.Interrupted division device (27) time will guarantee to give pressure in assembling, from Fig. 4 and Fig. 5 as seen, at first with driving shaft (36) bearing (37), (40) and on all parts be installed in lower box (32) hole; Then with driven shaft (28), bearing (46), (55) and on all parts be installed in upper box (30) hole.Upper box (30) is placed in lower box (32) groove, space cam (38) contacts with roller (29), its position is to be adjusted by the end cap (48) of the end cap of driving shaft (36) (33), (39) and driven shaft (28), (49), roller (29) and the pressure amount of the giving size that space cam (38) surface contacts are regulated the relative position of wedge (31) and parallels (41) and are controlled with screw rod (47).After regulating, pressing plate (43) upper box (30) and lower box (32) are tightened together, in lower box (32), load onto lubricating oil, load onto dust cover (45) and prevent that dust and other impurities from falling into several screws.Under driving, the bevel gear (69) of the bevel gear (34) on the driving shaft (36) of interrupted division device (27) in motor (59) driving main transmission (see figure 6) rotate, when driving shaft (36) rotates a week, driven shaft (28) pause certain hour and 60 ° of angles of rotation.The interrupted division device has stable drive for the intermittent movement that the die of cold headers provides, and calibration is accurate, and advantages such as the location is reliable, noiselessness are applicable to cavity die rotating multistation high-speed cold headers.
The number of the die (6) on die socket (3) plane if increase the number of die, will correspondingly change space cam (38) and pocket-wheel, gear (54) and geared sleeve (17) number ratio according to the technological requirement design.
From Fig. 2, Fig. 6 to Fig. 9 as seen, last two the die centerline holes of the die socket (3) of the cavity die rotating device (2) of this machine are to be horizontal when upsetting, and the 3rd die hole is in extreme lower position.Slide block (93) motion is by connecting rod (111) by bent axle (65), minor axis (112), contiguous block parts such as (113) drives, and the height of packing compact adjustment is to unclamp locking nut (109) and bolt (110), turns bolt (108) wedge (107) is moved up and down.Slide block (93) is moved forward and backward, after adjusting, bolt (110) is tightened and pinned with locking nut (109).Three moulds on the slide block (93) are corresponding with the die (6) of the die socket (3) of cavity die rotating device (2), and three punch dies all have independent adjusting device.Want single the adjustment; before adjustment, to take out all punch dies in the die shoe (98) of all dies (6) in the die of cavity die rotating device (2) (3) and slide block (93), in the punch die hole of the die shoe (98) of slide block (93), put into and adjust excellent (not shown).Slide block (93) is shifted to die socket (3), begin to adjust, the nut (96) of the fastening bolt (97) (102) on the die shoe (98), (101) unclamp, turning at screw rod (99) on the support (100) and the screw rod (104) on support (103) just to make die shoe (98) move in any direction, when entering in the die hole of its corresponding die socket (3) adjusting rod adjustment, because adjusting rod outside diameter matches with the die hole in the die socket (3), adjustment on the slide block (93) rod is a center line with the last pairing die hole of die socket (3) like this, fastening nut (96), (101), just die shoe (98) is fixed on the backing plate (115) of slide block (93).Die centerline hole method of adjustment on other two punch dies and the corresponding die socket (3) is with above-mentioned identical.After three die shoes are all adjusted, three drifts are put into the die shoe hole, adjust the closed gap length of punch die and die respectively, its method is to turn nut (88) and adjusting nut (87) can drive and adjust wedge (90) and move up and down, the inclined-plane of adjusting wedge (90) contacts with the inclined-plane of adjusting piece (116), make adjustment piece (116) promote punch die and move forward and backward, just can adjust the size in the closed gap of punch die and die.Other method of adjustment of two is also identical.
The motion of drive part is such, motor (59) is connected on base (85) side by motor cabinet (56), motor (59) provides driving power to pass on the flywheel (60) by means of belt pulley (57) driving belt (58), when clutch (61) engages, flywheel (60) drives flywheel shaft (78) and rotates, pass to gear (76) by the gear (77) on the flywheel shaft (78), driving bent axle (65) rotates, bent axle (65) two ends have dynamic poise device, the crank section of bent axle (65) and connecting rod (111) connecting band movable slider (107) horizontal reciprocating movement.Gear (76) in the bent axle (65) is passed to gear (73) with power, driving slow-speed shaft (74) rotates, there are an eccentric disc (72), eccentric disc (72) to be connected in the middle of the slow-speed shaft (74) and drive dnockout mechanism (82) motion with pull bar (84).Bevel gear (66) on the other end of slow-speed shaft (74) drives vertical distributing shaft (67) with bevel gear (68) engagement and rotates, cut-out cam (70) and blank feed-cam (71) are arranged in this centre, the cut-out and the feed mechanism (79) of these two cams control blanks drive interrupted division device (27) motion the vertical bevel gear (69) of distributing shaft (67) other end by bevel gear (34).The gear (17) that the gear of interrupted division device (54) drives cavity die rotating device (2) makes cavity die rotating device (2) intermittent movement.
Geared sleeve (17) on gear (54) on the driven shaft (28) and the cavity die rotating device (2) is the transmission of no gap.
In order to more fully understand the present invention, the process to die-revolving high-speed cold header with multiple working positions specifically describes below, and the processed blank that this machine uses is the metal wire rod material of circular cross-section.At first start the Oil pump electrical machinery (not shown) and carry out the lubricated of each motion link of full machine, start main driven by motor flywheel (60) then and rotate, clutch (61) joint makes each mechanism of machine all by the circular chart coordination of determining.By alignment, the metal wire rod of alignment process guide pipe (12) and the knife edge die (7) on cut-out die holder (8) are limited the length that needs by shelves glassware (not shown) to feed mechanism (80) traction metal wire rod by aligning mechanism (81).From Fig. 1 and Fig. 6 as seen; metal wire rod is cut off and delivers to the first rammer die place at A place by blank and feed mechanism (79); it is the die at A place among Fig. 2; at this moment cavity die rotating device (2) is to be in halted state; slide block (93) and on the punch die (not shown) close to die; just the punch die (not shown) advances blank in the first rammer die at A place; cut-out and feed mechanism (79) are return immediately; slide block (93) moves forward; just punch die continues to push away blank and carries out rammer moulding just, system that its essence is upset and whole two punch dies of upsetting are also upset simultaneously.When slide block backward during the motion certain distance, the fabricated part that the knockout rod of dnockout mechanism (82) will be in the whole rammer die at C place is got, at this moment cavity die rotating device (2) interrupted division device (27) control down rotation hexagonal angle degree stop.So just the part of upsetting is along with the die at place is shifted to smart position of upsetting, B place together, and smart part of upsetting is shifted to the position of the whole rammer in C place together along with the die at place, and first rammer position, A place is arrived in the die position that was in smart rammer position originally.When slide block travels forward once more, before having new blank to be sent to the first rammer die at A place again, circulate down according to the process of narrating previously like this, the every stroke of slide block once, carry out the rammer system of the different operations of multiple tracks simultaneously, just can finish the processing of a fabricated part.
By front described; we can find out die-revolving high-speed cold header with multiple working positions provided by the present invention at an easy rate; because this machine provides the die more than at least three that corresponding and the same number of punch die with the die socket upper cavity die is provided on slide block simultaneously at rotating die socket; its purpose just; in order to enlarge the cold heading technique scope; not only can upsetting system general common machine can upsetting system part, and the maximum characteristics of this machine are the parts of can the big bar of upsetting leading edge deformation amount processed section lacking. The station of this machine is arranged as circumferential arrangement, and cavity die rotating device intermittent rotary carries out the transposition of inter process. In order to make in the cavity die rotating device busy location reliable, calibration is accurate, provides advanced spatial cam as intermittent dividing device, and it is accurate that this device has a calibration, and the location is reliable, do not have and impact, be fit to, at a high speed; The advantages such as long service life. Because this machine modern design is rational in infrastructure, so this machine adjustment, easy to maintenance, noise is little, not only enlarges the processing range of cold headers, and has improved productivity ratio.
Multistation high-speed cold headers provided by the invention have been opened up a new way for manufacturing and designing of cold headers undoubtedly.
Claims (5)
1, is used to process the die-revolving high-speed cold header with multiple working positions of profiled members such as screw, rivet, having drive motors (56), transmission system, slider-crank mechanism (86), feed mechanism (80), aligning mechanism (81), cavity die rotating device (2), cut-out feed mechanism (8), dnockout mechanism (83) etc. forms, it is characterized in that: uniform circular hole more than three on the same circumference in die socket (3) plane, die (6) is installed in the hole, and slide block (86) is gone up and the same number of punch die corresponding with the die of die socket (3) is installed; There is a stressed dish (24) die socket (3) back, and a geared sleeve (17) that is connected with the fuselage hole by bearing is used for die socket (3), stressed round power dish (24), reaches the connecting axle (4) that geared sleeve (17) links together; The guiding mechanism of regulating product length is made of regulating sleeve (18), ring washer (16), adjusting nut (15) and connecting axle (4); In die and guiding mechanism, place the ejector beam group; The intermittent movement that is provided by spatial cam makes cavity die rotating device (3) make intermittent-rotation; Space cam (38) is enclosed within the middle part of driving shaft (36), driving shaft (36) two supports is in the bearing block (37) of lower box (32), (40), driven shaft (28) two ends are bearing in the two ends of upper box (30) by bearing (46), (55), pocket-wheel is installed at driven shaft (28) middle part, and the roller on the pocket-wheel (29) is meshed with space cam in turn.
2, die-revolving high-speed cold header with multiple working positions according to claim 1; it is characterized in that: the number of the die (6) on die socket (3) plane designs according to technological requirement; if increase the number of die, will correspondingly change space cam (38) and pocket-wheel, gear (54) and geared sleeve (17) number ratio.
3, die-revolving high-speed cold header with multiple working positions according to claim 1; it is characterized in that: regulating sleeve (18) is installed in the endoporus of geared sleeve (17); the internal diameter of regulating sleeve (18) cooperates with connecting axle (4); and relatively rotate with key (21) restriction; adjusting nut (15) can drive regulating sleeve (18) along the axial move left and right of connecting axle (4), to regulate the length that product needs.
4, die-revolving high-speed cold header with multiple working positions according to claim 1 is characterized in that: the roller of pocket-wheel (29) is gone up space cam (38) surface with driving shaft (36) in turn and contact, and remains with the space cam generation and give pressure.
5, die-revolving high-speed cold header with multiple working positions according to claim 1 is characterized in that: the geared sleeve (17) on gear (54) on the driven shaft (28) and the cavity die rotating device (2) is the transmission of no gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105260 CN1017783B (en) | 1987-08-20 | 1987-08-20 | Multi-station die rotary high-speed cold header |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105260 CN1017783B (en) | 1987-08-20 | 1987-08-20 | Multi-station die rotary high-speed cold header |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1031339A true CN1031339A (en) | 1989-03-01 |
| CN1017783B CN1017783B (en) | 1992-08-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87105260 Expired CN1017783B (en) | 1987-08-20 | 1987-08-20 | Multi-station die rotary high-speed cold header |
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| Country | Link |
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| CN (1) | CN1017783B (en) |
Cited By (12)
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| CN101817052A (en) * | 2010-03-12 | 2010-09-01 | 杨东佐 | Multi-station female die rotary upsetting machine and working method |
| CN101262965B (en) * | 2005-09-16 | 2011-04-13 | 本田技研工业株式会社 | Process for producing molded article with undercut, forging apparatus therefor |
| WO2011109974A1 (en) * | 2010-03-12 | 2011-09-15 | Yang Dongzuo | Female die rotation upsetting press and operating method thereof |
| CN103381461A (en) * | 2013-08-09 | 2013-11-06 | 杨东佐 | Die bi-direction rotation upsetter and work method |
| CN104690202A (en) * | 2015-03-17 | 2015-06-10 | 陈建德 | Main die rotary type high-speed cold heading machine |
| CN105344907A (en) * | 2015-12-09 | 2016-02-24 | 陈建德 | Silent main die rotary high-speed cold heading machine |
| CN104174808B (en) * | 2014-08-04 | 2016-05-04 | 哈尔滨工程大学 | Automatically cold heading rivet nailing machine |
| CN105983640A (en) * | 2015-03-05 | 2016-10-05 | 冯鸣 | Multi-station screw forming device |
| CN107413999A (en) * | 2017-06-16 | 2017-12-01 | 航天精工股份有限公司 | Turret head cross recess fastener upsetting forming method and mould |
| CN109175887A (en) * | 2018-07-18 | 2019-01-11 | 上海顺翼紧固件有限公司 | A kind of production technology and its application of Sifangtai contrast section bolt |
| CN109530606A (en) * | 2019-01-24 | 2019-03-29 | 常州机电职业技术学院 | Cold heading machine for screw machining |
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| CN1052927C (en) * | 1995-05-15 | 2000-05-31 | 雷世明 | Shaping device and technology for extra-long rod element |
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1987
- 1987-08-20 CN CN 87105260 patent/CN1017783B/en not_active Expired
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101262965B (en) * | 2005-09-16 | 2011-04-13 | 本田技研工业株式会社 | Process for producing molded article with undercut, forging apparatus therefor |
| WO2011109973A1 (en) * | 2010-03-12 | 2011-09-15 | Yang Dongzuo | Multi-station female die revolving upsetting press and processing method thereof |
| WO2011109974A1 (en) * | 2010-03-12 | 2011-09-15 | Yang Dongzuo | Female die rotation upsetting press and operating method thereof |
| CN101817052B (en) * | 2010-03-12 | 2012-05-16 | 杨东佐 | Multi-stage female die returning jolting machine and operating method |
| CN101817052A (en) * | 2010-03-12 | 2010-09-01 | 杨东佐 | Multi-station female die rotary upsetting machine and working method |
| CN103381461A (en) * | 2013-08-09 | 2013-11-06 | 杨东佐 | Die bi-direction rotation upsetter and work method |
| CN103381461B (en) * | 2013-08-09 | 2015-07-29 | 杨东佐 | A kind of die bidirectional rotation upsetter and method of work |
| CN104174808B (en) * | 2014-08-04 | 2016-05-04 | 哈尔滨工程大学 | Automatically cold heading rivet nailing machine |
| CN105983640A (en) * | 2015-03-05 | 2016-10-05 | 冯鸣 | Multi-station screw forming device |
| CN104690202A (en) * | 2015-03-17 | 2015-06-10 | 陈建德 | Main die rotary type high-speed cold heading machine |
| CN105344907A (en) * | 2015-12-09 | 2016-02-24 | 陈建德 | Silent main die rotary high-speed cold heading machine |
| CN105344907B (en) * | 2015-12-09 | 2017-06-16 | 陈建德 | Jing Yin main mould swinging type high-velocity cold headers |
| CN107413999A (en) * | 2017-06-16 | 2017-12-01 | 航天精工股份有限公司 | Turret head cross recess fastener upsetting forming method and mould |
| CN107413999B (en) * | 2017-06-16 | 2019-07-16 | 航天精工股份有限公司 | Turret head cross recess fastener upsetting forming method and mold |
| CN109175887A (en) * | 2018-07-18 | 2019-01-11 | 上海顺翼紧固件有限公司 | A kind of production technology and its application of Sifangtai contrast section bolt |
| CN109175887B (en) * | 2018-07-18 | 2020-08-07 | 上海顺翼紧固件有限公司 | Production process and application of square step adjusting bolt |
| CN109530606A (en) * | 2019-01-24 | 2019-03-29 | 常州机电职业技术学院 | Cold heading machine for screw machining |
| CN112371868A (en) * | 2020-10-26 | 2021-02-19 | 广州法思特精密五金有限公司 | Screw head forming process |
| CN112371868B (en) * | 2020-10-26 | 2022-03-15 | 广州法思特精密五金有限公司 | Screw head forming process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017783B (en) | 1992-08-12 |
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