CN107282675A - A kind of straight spur gear radial extrusion die and method - Google Patents
A kind of straight spur gear radial extrusion die and method Download PDFInfo
- Publication number
- CN107282675A CN107282675A CN201710361255.4A CN201710361255A CN107282675A CN 107282675 A CN107282675 A CN 107282675A CN 201710361255 A CN201710361255 A CN 201710361255A CN 107282675 A CN107282675 A CN 107282675A
- Authority
- CN
- China
- Prior art keywords
- pin
- mould
- gear
- punch
- cylinder
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/14—Making other products
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The present invention discloses a kind of straight spur gear radial compression shaping dies and method, including upper mould, lower mould and the radial extruding die being fixed between upper and lower mould, the elastomer and cylinder wedge of upper mould are connected with the motor-driven beam of pressure, wherein, elastomer is flat to be embedded in cylinder wedge upper end, lower mould is fixed on press bench, during extrusion molding, it is upper mould and lower mould matched moulds fixed gear blank first, then forcing press compresses elastomeric, cylinder wedge is pressurized and continues to move downward simultaneously, transmit the force to side punch-pin, make side punch-pin in coulisse up and down and side form fixed plate along radial motion, complete the shaping of gear radial compression, forcing press gos up, cylinder wedge is moved upwards, the counter motion under the effect of spring bolt restoring force of side punch-pin, mould is opened completely, take out gear product.Present invention decreases mould, institute is loaded, improves die life, and tooth cavity filling is fuller, improves the production efficiency and qualification rate of gear.
Description
Technical field
The present invention relates to straight spur gear extrusion forming technology, and in particular to a kind of straight spur gear radial extruding die
Tool and method.
Background technology
Gear is a kind of part for transmitting motion and power, is widely used in all kinds of mechanical fields such as automobile, ship,
There is powerful demand and range of needs.Therefore the improvement to Gear Production technology, will directly affect Gear Manufacture Industry production
Economic benefit.In recent years, extrusion molding turns into the dominant direction of formed gear, especially axle with its supremacy clause protruded
To extrusion molding gear process.The gear tooth metal streamline of axial compression shaping is distributed along continuous flank profil, and the strength of gear teeth is high, the longevity
Life length.These advantages not only avoid the shortcoming in traditional diamond-making technique, also have new progress on the basis of existing.But axially
Extruding but has that tooth cavity filling is difficult, shaping load is big, die life low technical barrier.Study a kind of new manufacturing process
Solve these technical barriers imperative.
The content of the invention
There is problem for above-mentioned, it is an object of the present invention to provide a kind of straight spur gear radial extrusion die and method,
It is intended to reduce mould stress and the time of contact with extrusion, so as to increase the life-span of mould, saves production cost, make gear
Forming arrangements are optimal.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of straight spur gear radial compression shaping dies, including upper die and lower die, the footpath that is fixed between upper and lower mould
To extrusion die, the elastomer of the upper mould is connected with the motor-driven beam of pressure, and the die shoe of the lower mould is fixed on press bench
On, the radial extruding die includes side punch-pin, coulisse, centring ring, cylinder wedge, side form fixed plate, outer sleeve, band spring
Bolt, the elastomer of the upper mould is flat to be embedded in cylinder wedge upper end, and the cylinder wedge is connected with the motor-driven beam of pressure, institute
The number and number of gear teeth for stating side punch-pin match, and the centring ring endoporus is contacted with coulisse outer ring, above the side punch-pin
By sunk screw connection upper mould fixed plate, centring ring, lower section connects centring ring, side form fixed plate, outer sleeve by sunk screw, made
Turn into entirety above and below the punch-pin of side, the side punch-pin can be moved radially by centring ring in coulisse, it is described with spring
Bolt is locked on the punch-pin of side through outer sleeve, cylinder wedge, can be moved up and down with cylinder wedge, is played compression and is returned
Bullet is acted on；It is upper mould and lower mould matched moulds fixed gear blank first under forcing press effect, then forcing press compresses elastomeric,
Cylinder wedge is pressurized and continues to move downward simultaneously, transmits the force to side punch-pin, makes side punch-pin solid in coulisse up and down and side form
Along radial motion in fixed board, gear extrusion shaping is completed, cylinder wedge is moved upwards, compression of the side punch-pin in spring bolt
The lower counter motion of effect, mould is opened completely, gear product is taken out.
Preferably, radial extruding die of the present invention also includes oblique ring flat-plate, and the oblique ring flat-plate passes through countersunk head spiral shell
Nail is fixed on the cylinder wedge, realizes the replaceability on the inclined-plane of cylinder wedge.
A kind of straight spur gear radial compression manufacturing process, using above-mentioned straight spur gear radial compression shaping dies
Gear blank radial compression is configured to gear product, comprised the following steps that：
(1) gear blank is prepared, phosphatization, saponification will be carried out after gear blank annealing softening；
(2) fixed gear blank, the gear blank for completing step (1) is put on the lower punch of lower mould, forcing press is downward
Motion, completes upper and lower mould matched moulds；
(3) gear blank is formed by radial extruding die, the elastomer of the upper mould of forcing press compression, cylinder wedge
Compression continues to move downward, and transmits the force to side punch-pin, makes side punch-pin in coulisse up and down and side form fixed plate along radially
Motion, starts the shaping of gear radial compression, can be oblique by cylinder to make side punch-pin move radially distance controlling in 8.3~8.4mm
The displacement value range control that wedge is moved downward is in 31.2~31.3mm, and forcing press is completed after the amount of moving down, and stops extruding, now,
The spring screw being connected on the punch-pin of side is drawn as die sinking and prepared, and forcing press gos up, and cylinder wedge is moved upwards, and side is convex
Mould counter motion under the compression of spring bolt, after mould is opened completely, takes out gear product.
The radial compression shaping of the present invention is multiple side punch-pin radial motions, one shaping of teeth gear of a side punch-pin,
The characteristics of meeting precise positioning Quick-forming, and mould lifting surface area is small, corner filling is complete；The present invention constitutes the upper of upper mould
Template is replaced by elastomer, is made after upper and lower mould matched moulds, and the motor-driven beam of pressure can be made to continue to press on cylinder wedge and moved downward,
The power for promoting side punch-pin radial motion is produced, radial compression process is realized, while the weight of whole set of die assembly is mitigated,
Reduce cost；The oblique ring flat-plate of the present invention is set on cylinder wedge by sunk screw, and the effect of power is transmitted to side punch-pin, its
It is removable it is transsexual ensure that cylinder wedge is not worn, increase die life；The coulisse and side form fixed plate of the present invention
Play and be accurately positioned with respectively forwardly being slided afterwards along coulisse after orienting railway effect, side punch-pin stress, complete compressional movement, replace
For the guide pillar needed for being axially moved, the effect of guide pin bushing；The spring bolt of the present invention is connected with side punch-pin, when extrusion molding is completed
Afterwards, side punch-pin is flicked by completion die sinking by spring force, realizes the effect of Quick-forming and Rapid reset, improve production effect
Rate.
The present invention realize radial compression shaping straight spur gear new technology, its smart structural design, service behaviour can
Lean on, die life is long, product qualification rate height and handling ease.It is full that this forming technique both can guarantee that tooth cavity corner was partially filled with
It is full, shaping load can be effectively reduced again, and production efficiency is improved while product qualification rate is improved.
Brief description of the drawings
Fig. 1 is straight spur gear radial compression forming die structure schematic diagram.
Fig. 2 is the top view of radial compression shaping dies shown in Fig. 1.
In figure：1- die shoes, 2- hexagon socket cap head screws, 3- lower mold fixed plates, the outer backing plates of 4-, 5- sunk screws, 6-
Sleeve fixed plate, 7- lower punches, 8- lower punch sleeves, 9- side form fixed plates, 10- centring rings, 11- outer sleeves, the oblique ring flat-plates of 12-,
13- downslide frids, 14- sides punch-pin, 15- upper grids, 16- cylinder wedges, 17- sunk screws, 18- backing plates, the upper moulds of 19- are consolidated
Fixed board, 20- elastomers, 21- upper male moulds, 22- gear blanks, 23- springs, 24- bolts, 25- plain washers (C grades), 26- hexagonal spiral shells
It is female.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described：
As shown in Fig. 1~2, the straight spur gear radial compression shaping dies of the embodiment of the present invention, including upper mould, under
Mould, the radial extruding die being fixed between upper and lower mould, upper mould include：Elastomer 20, backing plate 18, upper mould fixed plate 19, oblique ring flat-plate
12, elastomer 20 is connected with the motor-driven beam of pressure, radial extruding die include side punch-pin 14, upper and lower coulisse 15,13, centring ring 10,
Oblique ring flat-plate 12, cylinder wedge 16, side form fixed plate 9, outer sleeve 11, spring 23, bolt 24, the elastomer 20 of upper mould is flat to be embedded in
The upper end of cylinder wedge 16 of radial extruding die, cylinder wedge 16 is connected with the motor-driven beam of pressure, the number and gear of side punch-pin
The number of teeth matches, and centring ring endoporus is contacted with coulisse outer ring, the top of side punch-pin 14 by sunk screw connect upper mould fixed plate 19,
Centring ring 10, lower section connects centring ring 10, side form fixed plate 9, outer sleeve 11 by sunk screw, makes to turn into one above and below the punch-pin of side
Overall, side punch-pin can be moved radially by centring ring in coulisse, and oblique ring flat-plate is fixed on cylinder wedge by sunk screw
On, the bolt 24 with spring 23 is locked on side punch-pin 14 through outer sleeve 11, cylinder wedge 16, oblique ring flat-plate 12, and offside is convex
Mould 14 applies thrust, and upper and lower frid 15,13 offside punch-pin radially slide realization positioning and orientation constraint, spring, bolt quilt
After compression, side punch-pin is pulled to reset by restoring force, so as to complete radial compression process.Lower mould is fixed on pressure by die shoe 1
On power machine worktable, lower punch 7, lower die-sleeve cylinder 8 are inserted in die shoe 1, are fixed by lower mold fixed plate 3.Upper and lower mould is closed
Whole set of die connects together, and constitutes an entirety.
As shown in figure 1, during extruding, gear blank 22 is placed on lower punch 7, forcing press is moved downward, in forcing press
It is upper mould and lower mould matched moulds fixed gear blank first under effect, then forcing press compresses elastomeric 20, while cylinder wedge
16, which are pressurized, continues to move downward, and transmits the force to side punch-pin 14, makes side punch-pin in upper and lower coulisse 15,13 and side form fixed plate 9
Interior to complete gear extrusion shaping along radial motion, cylinder wedge 16 is moved upwards, and side punch-pin 14 is in the bolt with spring
Counter motion under compression, mould is opened completely, takes out gear product.
Gear blank radial compression is configured to by gear product using above-mentioned straight spur gear radial compression shaping dies
Method, it is comprised the following steps that：
(1) gear blank 22 is prepared, phosphatization, saponification will be carried out after gear blank annealing softening；
(2) fixed gear blank 22, gear blank is put on the lower punch 7 of lower mould, forcing press is moved downward, and is completed
Upper and lower mould matched moulds；
(3) extrusion molding, the elastomer 20 of the upper mould of forcing press compression, circle are carried out to gear blank 22 by radial extruding die
Cylinder wedge 16, which is pressurized, to be continued to move downward, and is transmitted the force to side punch-pin 14, is made side punch-pin in upper and lower coulisse 15,13 and side
Along radial motion in mould fixed plate 9, start the shaping of gear radial compression, exist to make side punch-pin move radially distance controlling
8.3mm, the displacement control that cylinder wedge is moved downward is in 31.2mm, and forcing press is completed after the amount of moving down, and stops extruding, this
When, spring 23, the screw 24 being connected on the punch-pin of side are drawn as die sinking and prepared, when forcing press gos up, cylinder wedge 16
Motion upwards, side punch-pin counter motion under the restoring force effect of spring 23, bolt 24, after mould is opened completely, takes out gear
Product.
Claims (4)
1. a kind of straight spur gear radial compression shaping dies, it is characterised in that including upper die and lower die, be fixed on upper and lower mould
Between radial extruding die, the elastomer of the upper mould is connected with the motor-driven beam of pressure, and the die shoe of the lower mould is fixed on pressure
On machine worktable, the radial extruding die includes side punch-pin, coulisse, centring ring, cylinder wedge, side form fixed plate, overcoat
Cylinder, the bolt with spring, the elastomer of the upper mould is flat to be embedded in cylinder wedge upper end, and the cylinder wedge and pressure are motor-driven
Beam is connected, and the number of the side punch-pin matches with number of gear teeth, and the centring ring endoporus is contacted with coulisse outer ring, the side
Upper mould fixed plate, centring ring are connected by sunk screw above punch-pin, lower section by sunk screw connect centring ring, side form fixed plate,
Outer sleeve, makes to turn into an entirety above and below the punch-pin of side, the side punch-pin can be moved radially by centring ring in coulisse, described
Bolt with spring is locked on the punch-pin of side through outer sleeve, cylinder wedge, can be moved up and down, be played with cylinder wedge
Compression and rebound effect；It is upper mould and lower mould matched moulds fixed gear blank, then forcing press compression first under forcing press effect
Elastomer, at the same cylinder wedge be pressurized continue to move downward, transmit the force to side punch-pin, make side punch-pin up and down coulisse and
Along radial motion in side form fixed plate, gear extrusion shaping is completed, cylinder wedge is moved upwards, and side punch-pin is with spring
The lower counter motion of restoring force effect of bolt, mould is opened completely, gear product is taken out.
2. a kind of straight spur gear radial compression shaping dies according to claim 1, it is characterised in that described footpath
Also include oblique ring flat-plate to extrusion die, the oblique ring flat-plate is fixed on the cylinder wedge by sunk screw, realizes cylinder
The replaceability on the inclined-plane of wedge.
3. a kind of straight spur gear radial compression shaping dies according to claim 1, it is characterised in that described bullet
Property body be rubber slab.
4. a kind of straight spur gear radial compression manufacturing process, it is characterised in that radially squeezed using the straight spur gear
Gear blank radial compression is configured to gear product by pressing formation mould, is comprised the following steps that：
(1) gear blank is prepared, phosphatization, saponification will be carried out after gear blank annealing softening；
(2) fixed gear blank, the gear blank for completing step (1) is put on the lower punch of lower mould, forcing press is moved downward,
Complete upper and lower mould matched moulds；
(3) extrusion molding, the elastomer of the upper mould of forcing press compression, cylinder wedge are carried out to gear blank by radial extruding die
Compression continues to move downward, and transmits the force to side punch-pin, makes side punch-pin in coulisse up and down and side form fixed plate along radially
Motion, starts the shaping of gear radial compression, can be oblique by cylinder to make side punch-pin move radially distance controlling in 8.3~8.4mm
The displacement value range control that wedge is moved downward is in 31.2~31.3mm, and forcing press is completed after the amount of moving down, and stops extruding, now,
The spring screw being connected on the punch-pin of side is drawn as die sinking and prepared, and forcing press gos up, and cylinder wedge is moved upwards, and side is convex
Mould counter motion under the restoring force effect of spring bolt, after mould is opened completely, takes out gear product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361255.4A CN107282675A (en) | 2017-05-19 | 2017-05-19 | A kind of straight spur gear radial extrusion die and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361255.4A CN107282675A (en) | 2017-05-19 | 2017-05-19 | A kind of straight spur gear radial extrusion die and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107282675A true CN107282675A (en) | 2017-10-24 |
Family
ID=60094650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710361255.4A Pending CN107282675A (en) | 2017-05-19 | 2017-05-19 | A kind of straight spur gear radial extrusion die and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107282675A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109047361A (en) * | 2018-08-22 | 2018-12-21 | 威海华邦精冲科技股份有限公司 | Lateral compression molding die, molding machine and method with non-straight-through indent tooth form |
| CN110153299A (en) * | 2019-06-27 | 2019-08-23 | 烟台豪德博尔机械设备有限公司 | Steel pipe bell and spigot molding machine |
| CN113560579A (en) * | 2021-07-28 | 2021-10-29 | 南京工程学院 | Large-scale die laser three-dimensional repairing device based on closed extrusion molding and using method thereof |
| CN114210756A (en) * | 2021-12-09 | 2022-03-22 | 湖南荣晟昌新材料科技有限公司 | High-wear-resistance sagger die for lithium battery anode material |
| CN114453501A (en) * | 2022-01-14 | 2022-05-10 | 北京瑞汀斯达机械配件有限公司 | Sleeve press-fitting mechanism |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04366028A (en) * | 1991-09-06 | 1992-12-17 | Metal Art:Kk | Manufacturing device for transmission gear |
| US20010001165A1 (en) * | 1997-12-26 | 2001-05-17 | Heiichi Hasegawa | Method of manufacturing a speed gear and an apparatus for manufacturing a speed gear |
| CN101060949A (en) * | 2003-12-04 | 2007-10-24 | 毕晓普创新有限公司 | Method for manufacturing steering rack |
| CN101249524A (en) * | 2008-04-11 | 2008-08-27 | 袁正敏 | Device for wedge pressure forming process gear |
| CN201711484U (en) * | 2010-07-08 | 2011-01-19 | 北京机电研究所 | Precision forging mould for floating straight-tooth cylindrical gear |
| CN203592012U (en) * | 2013-12-18 | 2014-05-14 | 株洲齿轮有限责任公司 | Sliding sleeve back taper extruding die |
-
2017
- 2017-05-19 CN CN201710361255.4A patent/CN107282675A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04366028A (en) * | 1991-09-06 | 1992-12-17 | Metal Art:Kk | Manufacturing device for transmission gear |
| US20010001165A1 (en) * | 1997-12-26 | 2001-05-17 | Heiichi Hasegawa | Method of manufacturing a speed gear and an apparatus for manufacturing a speed gear |
| CN101060949A (en) * | 2003-12-04 | 2007-10-24 | 毕晓普创新有限公司 | Method for manufacturing steering rack |
| CN101249524A (en) * | 2008-04-11 | 2008-08-27 | 袁正敏 | Device for wedge pressure forming process gear |
| CN201711484U (en) * | 2010-07-08 | 2011-01-19 | 北京机电研究所 | Precision forging mould for floating straight-tooth cylindrical gear |
| CN203592012U (en) * | 2013-12-18 | 2014-05-14 | 株洲齿轮有限责任公司 | Sliding sleeve back taper extruding die |
Non-Patent Citations (1)
| Title |
|---|
| 罗虎: "《冲压工艺与模具设计技巧图集速查手册》", 30 June 2015, 吉林出版集团有限责任公司等 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109047361A (en) * | 2018-08-22 | 2018-12-21 | 威海华邦精冲科技股份有限公司 | Lateral compression molding die, molding machine and method with non-straight-through indent tooth form |
| CN109047361B (en) * | 2018-08-22 | 2024-04-05 | 威海华邦精冲科技股份有限公司 | Lateral extrusion forming die, forming device with non-straight-through concave tooth shape and method |
| CN110153299A (en) * | 2019-06-27 | 2019-08-23 | 烟台豪德博尔机械设备有限公司 | Steel pipe bell and spigot molding machine |
| CN110153299B (en) * | 2019-06-27 | 2024-06-11 | 豪德博尔(山东)智能装备有限公司 | Steel pipe bell and spigot forming machine |
| CN113560579A (en) * | 2021-07-28 | 2021-10-29 | 南京工程学院 | Large-scale die laser three-dimensional repairing device based on closed extrusion molding and using method thereof |
| CN113560579B (en) * | 2021-07-28 | 2022-11-15 | 南京工程学院 | Large-scale die laser three-dimensional repairing device based on closed extrusion forming and using method thereof |
| CN114210756A (en) * | 2021-12-09 | 2022-03-22 | 湖南荣晟昌新材料科技有限公司 | High-wear-resistance sagger die for lithium battery anode material |
| CN114453501A (en) * | 2022-01-14 | 2022-05-10 | 北京瑞汀斯达机械配件有限公司 | Sleeve press-fitting mechanism |
| CN114453501B (en) * | 2022-01-14 | 2024-04-16 | 北京瑞汀斯达紧固系统有限公司 | Sleeve press-fitting mechanism |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107282675A (en) | A kind of straight spur gear radial extrusion die and method | |
| CN202752523U (en) | Automobile steering knuckle multidirectional die forging precision forging forming die | |
| CN107812871B (en) | A kind of high flange becomes the thick wall head solid forging method of wall thickness | |
| CN209062060U (en) | One kind being used for duplicate gear blank forging mold | |
| CN101708526B (en) | Method and die for forming driven helical gear profile of automobile rear axle | |
| CN103990753A (en) | Oil pump gear shaft precision-forging forming mold and forming method | |
| CN111745116A (en) | Forging forming device and method for excavator flange | |
| CN202087619U (en) | Temperature cool extrusion molding die for bevel gear | |
| CN214768660U (en) | Coal cutting pick mold structure capable of preventing mold from cracking | |
| CN201960038U (en) | Deep drawing die for producing bowl-shaped ornaments | |
| CN107671217A (en) | A kind of flanged ball valve valve body forging forming method and its base mould of use | |
| CN207447247U (en) | Double floating type lock ring cold closed-die forging one step forming mould | |
| CN102658304A (en) | Closed-extrusion and molding method of flange | |
| CN107363205B (en) | Forging forming die set of valve body forging piece of flange ball valve with handle | |
| CN207308860U (en) | A kind of molding die of charging gun double end contact pin | |
| CN201644691U (en) | Composite forming die mold of complicated axial forging with shaft shoulder and flange plate | |
| CN102350475B (en) | Material overlapping and cold precision forging technique for straight toothed spur gear | |
| CN205200433U (en) | Modulus is not less than 6 straight -teeth gear finish forge hot extrusion formation mould | |
| CN107520390A (en) | Double floating type lock ring cold closed-die forging one step forming mould | |
| CN209664111U (en) | Reflectal automotive wheels punching flaring die | |
| CN208555844U (en) | Vertical non-trimming molding machine | |
| CN102397966A (en) | Forging forming technology for extra-high voltage composite insulator groove-shaped hardware | |
| CN101486058A (en) | Precision punching method for drill bit | |
| CN111659800A (en) | Multi-section control mold for numerical control | |
| CN204108015U (en) | A kind of valve stem cold extrusion die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171024 |
|
| WD01 | Invention patent application deemed withdrawn after publication |