CN106825377A - The forging and molding mould and manufacture method of herringbone gear - Google Patents

The forging and molding mould and manufacture method of herringbone gear Download PDF

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Publication number
CN106825377A
CN106825377A CN201611234969.0A CN201611234969A CN106825377A CN 106825377 A CN106825377 A CN 106825377A CN 201611234969 A CN201611234969 A CN 201611234969A CN 106825377 A CN106825377 A CN 106825377A
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CN
China
Prior art keywords
mould
spill spin
spin block
press
upstream
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611234969.0A
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Chinese (zh)
Inventor
孙晓辉
邬银辉
钟尉清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Bokaidi Automation Technology Development Co Ltd
Original Assignee
Ningbo Bokaidi Automation Technology Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningbo Bokaidi Automation Technology Development Co Ltd filed Critical Ningbo Bokaidi Automation Technology Development Co Ltd
Priority to CN201611234969.0A priority Critical patent/CN106825377A/en
Publication of CN106825377A publication Critical patent/CN106825377A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/02Dies or mountings therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/08Accessories for handling work or tools
    • B21J13/14Ejecting devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00Making machine elements
    • B21K1/28Making machine elements wheels; discs
    • B21K1/30Making machine elements wheels; discs with gear-teeth
    • B21K1/305Making machine elements wheels; discs with gear-teeth helical

Abstract

The invention discloses the forging and molding mould of herringbone gear, including the mould upstream being assemblied on the press of press-forming machine and the mould bottom being arranged on press-forming machine price fixing, it is characterized in that mould upstream is provided with spill spin block being movably arranged in mould upstream, set up the upper mould of screw serrated form, upper mould top is provided with coaxially, can slide up and down drift, mould bottom is fixedly installed the lower mould for setting up screw serrated form, lower mould bottom is provided with coaxially, can slide up and down knock-pin, mould upstream is provided with Power Component to control spill spin block to rotate or static.Simple structure, structure reliability are high and control relatively low Mold Making expense, can effectively suppress the increase of manufacturing cost, and the angular phase of axial coil is in high precision between screw serrated form.

Description

The forging and molding mould and manufacture method of herringbone gear
Technical field
The present invention relates to a kind of shaping dies, more particularly, to a kind of forging and molding mould of herringbone gear and manufacturer Method.
Background technology
Herringbone gear refers to roller gear, roller gear have straight-tooth and helical teeth point, cylindric spiral gear is also referred to as helical tooth Wheel (having helixangleβ).When the helical teeth that the two ends of a gear are provided with identical or different rotation direction is exactly herringbone gear, people is commonly called as Word gear.Herringbone gear has two kinds of forms:One kind is that herringbone bear is processed on a blank, one kind be two differences not With the gear combination of rotation direction into herringbone bear, the former is large gear, and the latter is usually less gear.
The common manufacturing method of Cylinder Gear wheel-class parts is generally:Blanking, hot forging, normalizing, machining, heat treatment, essence It is processed into fabricated part.Substantial amounts of metal material is turned into iron filings through the cutting of cutter wherein in machining, is wasted Substantial amounts of steel material, simultaneously because using the processing of various lathes and cutter so that the cycle of processing is elongated, occupies a large amount of Process time, consume substantial amounts of electricity, and bending strength is not good enough.
Automobile drive axle spiral bevel gear started using finish forge near-net-shape technique in the last few years, by means of mould in pressure Helical gear form of gear tooth is processed by hot forging forming on power machine, then on the basis of tooth, processing mounting holes and mounting surface. This forging overcomes low stock utilization caused by existing machining, low production efficiency and has cut off metal The shortcomings of fibre flow and the bending strength that causes are reduced, meets the 21 century advanced manufacturing technology of efficient, accurate, green cleaning Development trend, be one of main path that Machining Spiral Bevel Gear is changed.
It is as shown in Figure 1 herringbone gear, including the first helical tooth 11, the second helical tooth 12 positioned at two ends.Now to double The processing of helical gear, generally obtains the first helical tooth 11 using being first processed shaping to one end of cylindrical part, then half-and-half The other end of finished product is processed shaping and obtains the second helical tooth 12.And the herringbone gear processed obtain in this way is adopted, Not only cost of manufacture is high, production efficiency is low, and the accuracy of gear is not high, and for the axis of the first helical tooth and the second helical tooth The control accuracy of angular phase is low.
The content of the invention
The technical problems to be solved by the invention are to provide the forging and molding mould and manufacture method of a kind of herringbone gear, Simple structure, structure reliability are high and control relatively low Mold Making expense, can effectively suppress the increase of manufacturing cost, The angular phase of axial coil is in high precision between screw serrated form.
The present invention solve the technical scheme that is used of above-mentioned technical problem for:The forging and molding mould of herringbone gear, including The mould upstream being assemblied on the press of press-forming machine and the mould bottom being arranged on press-forming machine price fixing, described mould Tool top is provided with spill spin block and is movably arranged on upper mould in mould upstream, setting up screw serrated form, described upper mould Top is provided with coaxially, can slide up and down drift, and mould bottom is fixedly installed the lower mould for setting up screw serrated form, institute The lower mould bottom stated is provided with coaxially, can slide up and down knock-pin, and described mould upstream is provided with Power Component Control spill spin block rotation or static.
Further preferred scheme of the invention:Described Power Component includes full wind-up and two hydraulic spring grease cups, described Full wind-up be fixedly installed on the center and two ends of spill spin block and stretch out described spill spin block, described hydraulic spring grease cup one end and mould Tool top movable connection, two other ends of hydraulic spring grease cup are flexibly connected with two ends respectively with full wind-up.Rotation is set Change hands the driving force that arm is used as spill spin block convolution with hydraulic spring grease cup so that spill spin block is in liquid after upper mould and herringbone gear disengaging Circled round in the presence of pressing spring to initial position.The full wind-up extended towards radial direction is provided with spill spin block, in hydraulic pressure Spring extruding full wind-up rotates spill spin block, and simple structure, structure reliability are high and control relatively low Mold Making expense With can effectively suppress the increase of manufacturing cost.
Further preferred scheme of the invention:Described Power Component also includes rotating part and regulation part, described Regulation part includes being fixed on the support block of mould upstream and is engaged on the reference block of the side for supporting block, described reference block Side with support block be connected and edge be evagination arc-shaped structure, the opposite side of reference block connects for planar structure with rotating part Connection is touched, described reference block can carry out rotation regulation around central shaft, and the side of described support block is to be adapted with reference block The circular arc caved in.Rotating part and regulation part are set, the initial position of spill spin block are carried out spacing, it is possible to rotate base Quasi- block contacts the plane position of the reference block being connected to adjust with rotating part.Because of mould upstream
Regulation part is set, the rotating part that can be together rotated with spill spin block is set on spill spin block, make rotating part with regulation Part reference block docking, make the axial coil of upper die and lower die angle position to return to the initial stage position to, so can make mould and under Mould it is accurate and it is high-precision be returned to the initial stage position to.The angular phase that axial coil between each screw serrated form can thus be obtained is high The herringbone gear of the formation of precision.
Further preferred scheme of the invention:Described regulation part includes the supporting part being fixed on spill spin block, described Supporting part on be provided with the docking section that is connected of reference block contact, be provided between described docking section and supporting part replaceable The pad of regulation, changes the initial displacement of the adjustable spill spin block of pad.Pad is changed, the position of spill spin block can be adjusted, The relative position of upper mould and lower mould is adjusted, it is determined that the relative position of upper lower gear wheel line.And, even same shape(Angle Degree position to)Product(Herringbone gear)Shaping in the case of, characteristic of factor material machinery and the difference of the condition such as lubricating status Cause mould movement, the difference of the rotation amount of spill spin block, the error that these conditions are produced carries out Product Precision after sample shaping Pad between the docking section of the error insertion rotating part of inspection, basis and normal value and supporting part, is just easy to obtain Amendment.
Further preferred scheme of the invention:Described mould upstream includes base plate and upper die clamper, described upper die clamp Tool is fixed on base plate, and described upper mould and drift are all arranged in spill spin block, are set between described spill spin block and upper die clamper It is equipped with bearing.Bearing is set and causes smaller, the spill spin block smooth rotation in upper die clamper that rubbed between spill spin block and upper die clamper.
Further preferred scheme of the invention:Described mould bottom includes lower mould clamping device, described lower mould and knock-pin On lower mould clamping device, the upper top surface of described lower mould clamping device is provided with depression, and the bottom surface of described spill spin block is provided with The projection being adapted with sunk structure.Corresponding must depression and projection is set so that after mould upstream is pushed and mould bottom Relative position is fixed.
Further preferred scheme of the invention:The manufacture method of herringbone gear, it is characterised in that comprise the following steps:
1) under original state, hydraulic spring grease cup is in micro- compressive state, and rotating part is against on regulation part, by columned material It is installed in mould bottom;
2) compressor operation of press-forming machine, mould upstream declines to material pressurization, is attached to the helical tooth on upper die and lower die Shape generates the twisting resistance of axial coil to material rolling forming, period material, makes spill spin block counterclockwise rotates, but rotation zero Part offsets with regulation part and limits spill spin block, the spinning movement that upper mould counterclockwise rotates, therefore in forming process, element Material is rotated clockwise in shaping dies;
3) press of press-forming machine continues to pressurize, and mould upstream moves to final position, completes the punch forming to material;
4) the press driven mold top of press-forming machine rises, and upper mould drives drift, drift to press the upper of material while rising End face so that material is maintained in lower mould and does not move, and now goes up mould by along the axial direction phase of the screw serrated form of material To movement, i.e. spill spin block on axial coil in being rotated clockwise, hydraulic spring grease cup is further compressed;
5) moment that material departs from from upper mould, hydraulic spring grease cup ejection, spill spin block is extremely adjusted towards the counterclockwise rotates of axial coil Part is docked with reference block, the angle of the axial coil of upper die and lower die position to return to the initial stage position to;
6) the press driven mold top of press-forming machine continues to rise, and drives knock-pin to rise the lower surface of extruding material, makes Material departs from from lower mould, so far herringbone gear molding from mould, obtains high-precision herringbone gear.
Compared with prior art, the advantage of the invention is that setting the upper die and lower die for setting up helical gear, by press To exert a force upper mould, synchronously carry out the punch forming to material gear, lower gear.Traditional herringbone gear is compared to, The step of this invention simplifies machined.In the punching press of helical gear and knockout course, can produce along the side of screw serrated form To certain revolving force is produced, the present invention is provided with spill spin block, and spill spin block can drive in punch forming and knockout course Upper mould is rotated or is remained stationary as so that the present invention can complete punch forming and the demoulding.The present invention can be by rotation The swing offset of switch block controls the angular phase of the axial coil between screw serrated form.The present invention is by knock-pin by material Deviate from from lower mould, deviate from material from upper mould by drift.Overall structure of the present invention is simple, low manufacture cost.
Brief description of the drawings
Fig. 1 is the structural representation of herringbone gear;
Fig. 2 is structural representation of the invention;
Fig. 3 is sectional view of the invention;
Fig. 4 is the spill spin block position of original state;
Fig. 5 is the spill spin block position that material departs from the moment from upper mould.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not For limiting the present invention.
It is as shown in Figures 1 to 5 embodiments of the invention one:The forging and molding mould of herringbone gear, including it is assemblied in punching Mould upstream 1 and the mould bottom 2 being arranged on press-forming machine price fixing on the press of pressing formation machine, mould upstream 1 are set Have and upper mould 3 in mould upstream 1, setting up screw serrated form is movably arranged on by spill spin block 5, the top of upper mould 3 is provided with On coaxial, can slide up and down drift 6, and mould bottom 2 is fixedly installed the lower mould 4 for setting up screw serrated form, and the lower bottom of mould 4 sets It is equipped with coaxially, can slide up and down knock-pin 7, mould upstream 1 is provided with Power Component to control spill spin block 5 to rotate or quiet Only.
Power Component includes full wind-up 21 and two hydraulic spring grease cups 22, and full wind-up 21 is fixedly installed on spill spin block 5 Center and spill spin block 5 is stretched out at two ends, the one end of hydraulic spring grease cup 22 is flexibly connected with mould upstream 1, two hydraulic spring grease cups 22 it is another End is flexibly connected with two ends respectively with full wind-up 21.
Power Component also includes rotating part 31 and regulation part 32, and regulation part 32 includes being fixed on mould upstream 1 Support block 33 and be engaged on the reference block 34 of the side for supporting block 33, the side of reference block 34 is connected with support block 33 and edge is The arc-shaped structure of evagination, the opposite side of reference block 34 is connected for planar structure is contacted with rotating part 31, and reference block 34 can be around Central shaft carries out rotation regulation, and the side for supporting block 33 is the circular arc caved in being adapted with reference block 34.
Regulation part 32 includes the supporting part 41 being fixed on spill spin block 5, is provided with supporting part 41 and is connect with reference block 34 The docking section 42 of connection is touched, the pad 43 of replaceable regulation is provided between docking section 42 and supporting part 41, changing pad 43 can Adjust the initial displacement of spill spin block 5.
Mould upstream 1 includes base plate 52 and upper die clamper 51, and upper die clamper 51 is fixed on base plate 52, upper mould 3 and drift 6 All it is arranged in spill spin block 5, bearing 53 is provided between spill spin block 5 and upper die clamper 51.
Mould bottom 2 includes lower mould clamping device 61, and lower mould 4 is arranged on lower mould clamping device 61 with knock-pin 7, lower mould clamping device 61 Upper top surface is provided with depression, and the bottom surface of spill spin block 5 is provided with the projection being adapted with sunk structure.
The form of implementation is not limited solely to the note form, and for example following composition can also.
The other parts of embodiment two are identical with embodiment one, and its difference is:In mould upstream 1, a liquid is set Pressing spring 22, gear is set in the center of spill spin block 5, and causes the engagement of wheel and rack formula pushing meanss, and pushing meanss are then There is hydraulic spring grease cup 22 to provide power.
The other parts of embodiment three are identical with embodiment one, and its difference is:Power Component is servomotor, By Serve Motor Control revolving part.
The other parts of example IV are identical with embodiment one, and its difference is:Make drift 6 during shaping relative to upper Mould 3 is rotated, and liberation acts on the torsion strength of material, and this is also possible.
The manufacture method of herringbone gear, it is characterised in that comprise the following steps:
1) under original state, hydraulic spring grease cup 22 is in micro- compressive state, and rotating part 31 is against on regulation part 32, will be cylindric Material 10 be installed in mould bottom 2;
2) compressor operation of press-forming machine, mould upstream 1 declines material 10 is pressurizeed, and is attached to the spiral shell on mould 3 and lower mould 4 To the rolling forming of material 10, period material 10 generates the twisting resistance of axial coil to rotation tooth form, spill spin block 5 is counterclockwise revolved Turn, but rotating part 31 with regulation part 32 offset limit spill spin block 5, the spinning movement that upper mould 3 counterclockwise rotates, Therefore in forming process, material 10 is rotated clockwise in shaping dies;
3) press of press-forming machine continues to pressurize, and mould upstream 1 moves to final position, completes striking out to material 10 Type;
4) the press driven mold top 1 of press-forming machine rises, and drift 6, the pressure material of drift 6 are driven while upper mould 3 rises 10 upper surface so that material 10 is maintained in lower mould 4 and does not move, and now goes up mould 3 by along the screw serrated form of material 10 Axial direction relative movement, i.e., spill spin block 5 in being rotated clockwise on axial coil, further pressed by hydraulic spring grease cup 22 Contracting;
5) moment that material 10 departs from from upper mould 3, hydraulic spring grease cup 22 is ejected, counterclockwise rotates of the spill spin block 5 towards axial coil Docked with reference block 34 to regulation part 32, upper mould 3, the axial coil of lower mould 4 angle position to return to initial stage to;
6) the press driven mold top 1 of press-forming machine continues to rise, and drives knock-pin 7 to rise the lower end of extruding material 10 Face, makes material 10 depart from from lower mould 4, so far herringbone gear molding from mould, obtains high-precision herringbone gear.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (7)

1. the forging and molding mould of herringbone gear, including the mould upstream being assemblied on the press of press-forming machine be arranged on punching Mould bottom on pressing formation machine price fixing, it is characterised in that described mould upstream is provided with spill spin block and is movably arranged on mould Upper mould in tool top, to set up screw serrated form, described upper mould top is provided with coaxially, can slide up and down punching Head, mould bottom is fixedly installed the lower mould for setting up screw serrated form, and described lower mould bottom is provided with coaxial, can be upper and lower The knock-pin of slip, described mould upstream is provided with Power Component to control spill spin block to rotate or static.
2. the forging and molding mould of herringbone gear according to claim 1, it is characterised in that described Power Component bag Include full wind-up and two hydraulic spring grease cups, the center and two ends that described full wind-up is fixedly installed on spill spin block stretch out described Spill spin block, described hydraulic spring grease cup one end is flexibly connected with mould upstream, two other ends of hydraulic spring grease cup with respectively with rotation Two ends of arm are flexibly connected.
3. the forging and molding mould of herringbone gear according to claim 1, it is characterised in that described Power Component is also Including rotating part and regulation part, described regulation part includes being fixed on the support block of mould upstream and is engaged on support block Side reference block, the side of described reference block with support block be connected and edge be evagination arc-shaped structure, reference block Opposite side be connected for planar structure and rotating part are contacted, described reference block can carry out rotation regulation around central shaft, described Support block side be with reference block be adapted the circular arc caved in.
4. the forging and molding mould of herringbone gear according to claim 3, it is characterised in that described regulation part bag The supporting part being fixed on spill spin block is included, the docking section being connected with reference block contact is installed on described supporting part, it is described The pad of replaceable regulation is provided between docking section and supporting part, the initial displacement of the adjustable spill spin block of pad is changed.
5. the forging and molding mould of herringbone gear according to claim 1, it is characterised in that described mould upstream bag Base plate and upper die clamper are included, described upper die clamper is fixed on base plate, described upper mould and drift are all arranged in spill spin block, Bearing is provided between described spill spin block and upper die clamper.
6. the forging and molding mould of herringbone gear according to claim 5, it is characterised in that described mould bottom bag Include lower mould clamping device, described lower mould is arranged on lower mould clamping device with knock-pin, the upper top surface of described lower mould clamping device is provided with recessed Fall into, the bottom surface of described spill spin block is provided with the projection being adapted with sunk structure.
7. the manufacture method of herringbone gear, it is characterised in that comprise the following steps:
1) under original state, hydraulic spring grease cup is in micro- compressive state, and rotating part is against on regulation part, by columned material It is installed in mould bottom;
2) compressor operation of press-forming machine, mould upstream declines to material pressurization, is attached to the helical tooth on upper die and lower die Shape generates the twisting resistance of axial coil to material rolling forming, period material, makes spill spin block counterclockwise rotates, but rotation zero Part offsets with regulation part and limits spill spin block, the spinning movement that upper mould counterclockwise rotates, therefore in forming process, element Material is rotated clockwise in shaping dies;
3) press of press-forming machine continues to pressurize, and mould upstream moves to final position, completes the punch forming to material;
4) the press driven mold top of press-forming machine rises, and upper mould drives drift, drift to press the upper of material while rising End face so that material is maintained in lower mould and does not move, and now goes up mould by along the axial direction phase of the screw serrated form of material To movement, i.e. spill spin block on axial coil in being rotated clockwise, hydraulic spring grease cup is further compressed;
5) moment that material departs from from upper mould, hydraulic spring grease cup ejection, spill spin block is extremely adjusted towards the counterclockwise rotates of axial coil Part is docked with reference block, the angle of the axial coil of upper die and lower die position to return to the initial stage position to;
6) the press driven mold top of press-forming machine continues to rise, and drives knock-pin to rise the lower surface of extruding material, makes Material departs from from lower mould, so far herringbone gear molding from mould, obtains high-precision herringbone gear.
CN201611234969.0A 2016-12-28 2016-12-28 The forging and molding mould and manufacture method of herringbone gear Pending CN106825377A (en)

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Application Number Priority Date Filing Date Title
CN201611234969.0A CN106825377A (en) 2016-12-28 2016-12-28 The forging and molding mould and manufacture method of herringbone gear

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Application Number Priority Date Filing Date Title
CN201611234969.0A CN106825377A (en) 2016-12-28 2016-12-28 The forging and molding mould and manufacture method of herringbone gear

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108436010A (en) * 2018-01-23 2018-08-24 台州万特汽车零部件有限公司 Helical tooth cold forging machine
CN112058936A (en) * 2019-06-10 2020-12-11 上海汽车变速器有限公司 Cold extrusion molding process of bevel gear

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2317027Y (en) * 1997-08-26 1999-05-05 高魁阁 Hot forging gear blank die device
JP2007245220A (en) * 2006-03-17 2007-09-27 Fuji Heavy Ind Ltd Forging device
JP2008080406A (en) * 2007-12-20 2008-04-10 Toyota Motor Corp Press-forming die and method for manufacturing double-helical gear
CN201524766U (en) * 2009-11-05 2010-07-14 郑州机械研究所 Internal bevel gear or spiral involute internal spline plastic precise forming device
JP2011240387A (en) * 2010-05-20 2011-12-01 Michihiro Yokoyama Planetary pinion case and press device for planetary pinion case
CN203390145U (en) * 2013-08-23 2014-01-15 浙江振华紧固件有限公司 Bevel wheel heading die
CN104972002A (en) * 2015-07-17 2015-10-14 武汉理工大学 Helical gear demoulding device and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2317027Y (en) * 1997-08-26 1999-05-05 高魁阁 Hot forging gear blank die device
JP2007245220A (en) * 2006-03-17 2007-09-27 Fuji Heavy Ind Ltd Forging device
JP2008080406A (en) * 2007-12-20 2008-04-10 Toyota Motor Corp Press-forming die and method for manufacturing double-helical gear
CN201524766U (en) * 2009-11-05 2010-07-14 郑州机械研究所 Internal bevel gear or spiral involute internal spline plastic precise forming device
JP2011240387A (en) * 2010-05-20 2011-12-01 Michihiro Yokoyama Planetary pinion case and press device for planetary pinion case
CN203390145U (en) * 2013-08-23 2014-01-15 浙江振华紧固件有限公司 Bevel wheel heading die
CN104972002A (en) * 2015-07-17 2015-10-14 武汉理工大学 Helical gear demoulding device and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108436010A (en) * 2018-01-23 2018-08-24 台州万特汽车零部件有限公司 Helical tooth cold forging machine
CN108436010B (en) * 2018-01-23 2019-12-10 台州万特汽车零部件有限公司 Cold forging machine for spiral teeth
CN112058936A (en) * 2019-06-10 2020-12-11 上海汽车变速器有限公司 Cold extrusion molding process of bevel gear

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