CN109079035A - A kind of retaining ring finishing mold - Google Patents
A kind of retaining ring finishing mold Download PDFInfo
- Publication number
- CN109079035A CN109079035A CN201811257814.8A CN201811257814A CN109079035A CN 109079035 A CN109079035 A CN 109079035A CN 201811257814 A CN201811257814 A CN 201811257814A CN 109079035 A CN109079035 A CN 109079035A
- Authority
- CN
- China
- Prior art keywords
- plate
- upper die
- die holder
- mold
- retaining ring
- 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
- 230000000712 assembly Effects 0.000 claims abstract description 18
- 238000000429 assembly Methods 0.000 claims abstract description 18
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 229920001971 elastomer Polymers 0.000 claims abstract description 5
- 239000000806 elastomer Substances 0.000 claims abstract description 5
- 210000003746 feather Anatomy 0.000 claims description 24
- 239000000945 filler Substances 0.000 claims description 4
- 238000009827 uniform distribution Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000007493 shaping process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
- B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of retaining ring finishing mold, including upper die component, lower mold assemblies, the guiding device for connecting upper die component and lower mold assemblies and the device for discharging being arranged on upper die component and lower mold assemblies；Upper die component include upper die holder, outer ring, the cavity plate for being arranged on the inside of outer ring and being connected by carriage and outer ring, pressing plate, the compressed spring being arranged between pressing plate and upper die holder, upper die holder bottom end be located at compressed spring, adjustable plate and the mold core being arranged between fixed plate, fixed plate and the upper die holder that the inside of cavity plate is arranged；Lower mold assemblies include lower die holder, the punch-pin that lower die holder top is arranged in, supporting plate, lower liner plate and elastomer；Workpiece to be formed is placed on punch-pin, pushes upper die component, and mold core enters the inside of workpiece to be formed, and for cavity plate from the outside of workpiece to be formed to contract, workpiece to be formed is pressed into predetermined size.The precision of mold is high, maintenance cost is low, and there is no embracing mould phenomenon and pressing inclined phenomenon, the workpiece size precision after finishing is high, elasticity is good.
Description
Technical field
The present invention relates to field of machining, particularly relate to a kind of retaining ring finishing mold.
Background technique
Currently, traditional retaining ring shaping mould structure is, sliding block sliding directly opposite with outer ring is repaired after die wear
Cost is excessively high；Easily there is workpiece and embraces mould phenomenon；Mold is not easy pressure inclined phenomenon easily occur to just when installing；It is elastic after workpiece shaping
Standard requirements are not achieved.
Summary of the invention
The purpose of the present invention is to provide a kind of retaining ring finishing molds, for solving mold repair cost in the prior art
The problem of standard requirements are not achieved in elasticity after high, workpiece embraces mould, the inclined phenomenon of pressure and workpiece shaping easily occurs.
To achieve the above object, the present invention the following technical schemes are provided:
A kind of retaining ring finishing mold, including upper die component, lower mold assemblies, the connection upper die component and the lower mold assemblies
Guiding device and the device for discharging that is arranged on the upper die component and the lower mold assemblies；
The upper die component includes upper die holder, the outer ring that the upper die holder bottom end is arranged in, is arranged on the inside of the outer ring
And connect with the outer ring by carriage cavity plate, the cavity plate top is set pressing plate, be arranged in the pressing plate and
Compressed spring between the upper die holder and the liner plate that the carriage bottom end is arranged in, the bottom end of the upper die holder is located at institute
It states and is provided with fixed plate on the inside of cavity plate, compressed spring, the fixed plate are provided between the fixed plate and the upper die holder
Bottom end be provided with adjustable plate, the bottom end of the adjustable plate is provided with mold core；
The lower mold assemblies include lower die holder, the punch-pin that the lower die holder top is arranged in, are arranged on the lower die holder
Supporting plate and the lower liner plate that is arranged on the supporting plate, be provided with elastomer between the lower die holder and the supporting plate；
Workpiece to be formed is placed on the punch-pin, pushes the upper die component, and the mold core enters the work to be formed
The inside of part, for the cavity plate from the outside of the workpiece to be formed to contract, the workpiece to be formed is pressed into pre- scale
It is very little.
Wherein, the inside of the outer ring is equipped with 8-16 pyramidal surface, and the pyramidal surface is equipped with keyway.
Wherein, upper circumference uniform distribution is provided with 24-36 oil filler point on the outside of the outer ring.
Wherein, the guiding device includes the guide sleeve being arranged on the upper die holder and is arranged on the lower die holder
Adjusting sleeve, the adjusting sleeve can protrude into the guide sleeve.
Wherein, the device for discharging includes that one end connects the lower die holder and the other end can be stretched out from the supporting plate top
Unloading bolt and supporting plate, and the unloading bolt and pressing plate that are arranged on the upper die holder.
Wherein, the bottom end of the outer ring is provided with baffle.
Wherein, feather key is provided on the inside of the outer ring, being provided on the outside of the cavity plate can be along the feather key
Mobile guide plate.
Wherein, the carriage include the feather key being arranged in the keyway and along the feather key slide sliding block,
The sliding block connects cavity plate.
Wherein, the groove on the sliding block is connect with the protrusion on the cavity plate, and the shape of the groove and the protrusion
Shape is adapted.
Wherein, the two sides that the sliding block is contacted with the feather key when sliding block is slided along the feather key are respectively arranged with
Backing plate.
The advantageous effects of the above technical solutions of the present invention are as follows:
In above scheme, the precision of retaining ring finishing mold of the invention is high, and maintenance cost is low, there is no mould phenomenon is embraced, no
In the presence of inclined phenomenon is pressed, the workpiece size precision after finishing is high.Elasticity is good.
Detailed description of the invention
Fig. 1 is the cross-sectional view of retaining ring finishing mold of the invention；
Fig. 2 is the cross-sectional view of the punch-pin of retaining ring finishing mold of the invention；
Fig. 3 is the cross-sectional view of the cavity plate of retaining ring finishing mold of the invention；
Fig. 4 is the partial top view of the cavity plate of retaining ring finishing mold of the invention；
Fig. 5 is the top view of the sliding block of retaining ring finishing mold of the invention；
Fig. 6 is the C direction view of the sliding block of retaining ring finishing mold of the invention；
Fig. 7 is the A-A cross-sectional view of the sliding block of retaining ring finishing mold of the invention；
Fig. 8 is the B-B cross-sectional view of the sliding block of retaining ring finishing mold of the invention；
Fig. 9 is the cross-sectional view of the backing plate of retaining ring finishing mold of the invention；
Figure 10 is the A direction view of the backing plate of retaining ring finishing mold of the invention；
Figure 11 is the C-C view of the backing plate of retaining ring finishing mold of the invention；
Figure 12 is the cross-sectional view of the feather key of retaining ring finishing mold of the invention；
Figure 13 is the cross-sectional view of the outer ring of retaining ring finishing mold of the invention；
Figure 14 is the top view of the outer ring of retaining ring finishing mold of the invention.
Appended drawing reference:
1, lower die holder；2, lifting lug；3, unloading bolt；4, elastomer；5, supporting plate；6, baffle；9, backing plate；10, outer ring；12,
Guide plate；14, feather key；16, upper die holder 16；18, sliding block；20, pressing plate；21, compressed spring；25, cavity plate；29, guide sleeve；
30, fixed plate；31, limiter；32, adjustable plate；34, mold core；35, adjusting sleeve；37, punch-pin；39, upper liner plate；40, lower liner plate.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
The present invention for existing mold repair, embrace mould, bullet after the inclined phenomenon of pressure and workpiece shaping easily occur by high cost, workpiece
The problem of standard requirements are not achieved in property, provide a kind of retaining ring finishing mold.
As represented in figures 1 through 14, the embodiment of the invention provides a kind of retaining ring finishing molds, including upper die component, lower die group
Part, the guiding device of the connection upper die component and the lower mold assemblies and setting are in the upper die component and the lower mold assemblies
On device for discharging；
The upper die component includes upper die holder 16, the outer ring 10 that 16 bottom end of upper die holder is arranged in, setting described outer
Cavity plate 25, the pressing plate that 25 top of cavity plate is set, setting are connect with the outer ring 10 on the inside of circle 10 and by carriage
Compressed spring between the pressing plate and the upper die holder 16 and the liner plate that the carriage bottom end is set, the upper mold
The inside that the bottom end of seat 16 is located at the cavity plate 25 is provided with fixed plate, is provided between the fixed plate and the upper die holder 16
Compressed spring 21, the bottom end of the fixed plate are provided with adjustable plate 32, and the bottom end of the adjustable plate 32 is provided with mold core 34；
The lower mold assemblies include lower die holder 1, the punch-pin 37 that 1 top of lower die holder is arranged in, are arranged in the lower die
Supporting plate 5 on seat 1 and the lower liner plate 40 being arranged on the supporting plate 5, are provided with bullet between the lower die holder 1 and the supporting plate 5
Property body 4；
The design of the guiding device of retaining ring finishing mold of the invention is not so that the mold is deposited in use
Pressing inclined phenomenon；The design of the upper liner plate 39 and the lower liner plate 40 can reduce the upper die component and the lower mold assemblies
Abrasion when contact reduces the maintenance cost of mold；The carriage may make that the cavity plate 25 is sliding along the outer ring 10
It is dynamic, it solves workpiece and embraces modulus problem；The elastomer 4 is arranged between the supporting plate 5 and the lower die holder 1, and the supporting plate 5 connects
Connect the lower liner plate 40, the sliding block 18 connects the upper liner plate 39, and the upper liner plate 39 and the lower liner plate 40 can be held in the palm
Put down the sliding block 18 so that the sliding block 18 baseplane keep horizontality, the sliding block 18 shrink when will not deflection, institute
It states cavity plate 25 and shrinks workpiece, workpiece uniform force, elasticity is good for the workpiece processed using retaining ring finishing mold of the invention.
Workpiece to be formed is placed on the punch-pin 37, pushes the upper die component, the mold core 34 enter it is described at
The inside of shape workpiece, from the outside of the workpiece to be formed to contract, the workpiece to be formed is pressed into the cavity plate 25
Predetermined size.
Wherein, the inside of the outer ring 10 is equipped with 8-16 pyramidal surface.The pyramidal surface is equipped with keyway.The sliding dress
The sliding block 18 setting the feather key including being arranged in the keyway and sliding along the feather key, the sliding block 18 connect cavity plate 25.
Groove on the sliding block 18 is connect with the protrusion on the cavity plate 25, and the groove is adapted with the shape of the protrusion.
The sliding block 18 two sides that the sliding block 18 is contacted with the feather key when sliding along the feather key are respectively arranged with backing plate 9.
The feather key lateral surface of retaining ring finishing mold of the invention is provided with the pyramidal surface phase with 10 inside of outer ring
The pyramidal surface of adaptation, the carriage passes through the design of feather key and the sliding block 18, so that the cavity plate 25 can be along described
The guiding movement of 10 inside keyway of outer ring.Meanwhile backing plate 9 is provided on the sliding block 18, the backing plate 9 uses wear-resistant material
Material, the carriage is wear-resistant.Part in retaining ring finishing mold of the invention is to be detachably connected, and wears or damages
Afterwards, direct renewal part reduces the maintenance cost of mold.
Wherein, upper circumference uniform distribution is provided with 24-36 oil filler point on the outside of the outer ring 10.
The setting of the oil filler point of retaining ring finishing mold of the invention can reduce the abrasion journey of mold in order to the lubrication of mold
Degree, increases the service life of mold.
Wherein, the guiding device includes the guide sleeve 29 being arranged on the upper die holder 16 and is arranged in the lower die holder
Adjusting sleeve 35 on 1, the adjusting sleeve 35 can protrude into the guide sleeve 29.
The setting of the guiding device of retaining ring finishing mold of the invention can make the upper die component and it is described under
During membrane module molds, the upper die component and the lower mold assemblies are to just, the upper die component and the lower mold assemblies
Without the inclined phenomenon of pressure.
Wherein, the device for discharging includes one end connection lower die holder 1 and the other end can be stretched out from 5 top of supporting plate
Unloading bolt 3 and the unloading bolt 3 that is arranged on the upper die holder 16.
The design of the device for discharging of retaining ring finishing mold of the invention is so that the workpiece to be formed after forming is fast
Fast discharging.
Wherein, the bottom end of the outer ring 10 is provided with baffle 6.
It is respectively arranged with lifting lug 2 on the upper die holder 16 and the lower die holder 1 of retaining ring finishing mold of the invention, is convenient for
It moves moulds.The bottom end of the outer ring 10 of retaining ring finishing mold of the invention is provided with baffle 6, the baffle 6 and the outer ring 10
It is detachably connected, convenient for the assembling of mold.
Wherein, the inside of the outer ring 10 is provided with feather key 14, and the outside of the slide plate 18 is provided with can be along described
The mobile guide plate 12 of feather key 14.
The feather key 14 and the guide plate 12 of retaining ring finishing mold of the invention play the role of guiding.
Retaining ring finishing mold of the invention is mounted on friction press, and the upper die holder 16 and the friction press are sliding
Block connection, the lower die holder 1 is installed on the workbench, workpiece to be formed is placed on the punch-pin 37, by the adjusting sleeve
35, which enter the guide sleeve 29, the feather key 14 and the guide plate 12, plays guiding in upper die component pushing process
Effect.Start friction press, pushes the upper die holder 16, so that the upper die component moves down, the mold core 34 is in institute
The inside that the workpiece to be formed is introduced under the action of compressed spring 21 is stated, as the upper die component continues to move down,
The compressed spring 21 is in contraction state, and the sliding block 18 drives cavity plate 25 along the keyway of 10 inside of outer ring to moving up
It being shunk while dynamic, the workpiece to be formed is pressed into predetermined size by the cavity plate 25, mold core 34 and the punch-pin 37,
Obtain workpiece.It is lifted up the upper die holder 16, so that the upper die component moves up, the cavity plate 25 is in the compression bullet
Outside expanding while being moved down under the action of spring 21 along the keyway in the outer ring 10 so that the cavity plate 25 with it is described
Workpiece is detached from, and is unloaded the workpiece using the unloading bolt 3.
In above scheme, the precision of retaining ring finishing mold of the invention is high, and maintenance cost is low, there is no mould phenomenon is embraced, no
In the presence of inclined phenomenon is pressed, the workpiece size precision after finishing is high, elasticity is good.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
In the description of the present invention, it is to be understood that, the orientation or positional relationship of the instructions such as term " upper ", " one end " is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " being equipped with " " connects
Connecing " shall be understood in a broad sense.It for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be straight
Connect it is connected, can also be indirectly connected through an intermediary.Being fixedly connected can be the common techniques such as to weld, be threadedly coupled and step up
Scheme.For the ordinary skill in the art, can be understood with concrete condition above-mentioned term in the present invention specifically contain
Justice.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of retaining ring finishing mold, which is characterized in that including upper die component, lower mold assemblies, the connection upper die component and institute
The device for discharging stating the guiding device of lower mold assemblies and being arranged on the upper die component and the lower mold assemblies；
The upper die component includes upper die holder, the outer ring that the upper die holder bottom end is arranged in, is arranged on the inside of the outer ring and leads to
Cross cavity plate that carriage connect with the outer ring, pressing plate that the cavity plate top is set, setting the pressing plate with it is described
Compressed spring between upper die holder and the liner plate that the carriage bottom end is arranged in, the bottom end of the upper die holder is located at described recessed
It is provided with fixed plate on the inside of mould, compressed spring, the bottom of the fixed plate are provided between the fixed plate and the upper die holder
End is provided with adjustable plate, and the bottom end of the adjustable plate is provided with mold core；
The lower mold assemblies include lower die holder, the punch-pin that the lower die holder top is arranged in, the support of setting on the lower die holder
Plate and the lower liner plate being arranged on the supporting plate, are provided with elastomer between the lower die holder and the supporting plate；
Workpiece to be formed is placed on the punch-pin, pushes the upper die component, and the mold core enters the workpiece to be formed
Inside, for the cavity plate from the outside of the workpiece to be formed to contract, the workpiece to be formed is pressed into predetermined size.
2. retaining ring finishing mold as described in claim 1, which is characterized in that the inside of the outer ring is equipped with 8-16 pyramid
Face, the pyramidal surface are equipped with keyway.
3. retaining ring finishing mold as described in claim 1, which is characterized in that upper circumference uniform distribution is provided on the outside of the outer ring
24-36 oil filler point.
4. retaining ring finishing mold as described in claim 1, which is characterized in that the guiding device includes being arranged in the upper mold
The adjusting sleeve of guide sleeve and setting on the lower die holder on seat, the adjusting sleeve can protrude into the guide sleeve.
5. retaining ring finishing mold as described in claim 1, which is characterized in that the device for discharging includes under one end connection is described
The unloading bolt and supporting plate that die holder and the other end can be stretched out from the supporting plate top, and the discharging spiral shell being arranged on the upper die holder
Nail and pressing plate.
6. retaining ring finishing mold as described in claim 1, which is characterized in that the bottom end of the outer ring is provided with baffle.
7. retaining ring finishing mold as described in claim 1, which is characterized in that be provided with feather key, institute on the inside of the outer ring
State the guide plate for being provided with and being moved on the outside of cavity plate along the feather key.
8. retaining ring finishing mold as claimed in claim 2, which is characterized in that the carriage includes being arranged in the keyway
Interior feather key and the sliding block slided along the feather key, the sliding block connect cavity plate.
9. retaining ring finishing mold as claimed in claim 8, which is characterized in that on the groove and the cavity plate on the sliding block
Protrusion connection, and the groove is adapted with the shape of the protrusion.
10. retaining ring finishing mold as claimed in claim 8, which is characterized in that the sliding block slides when institute along the feather key
It states the two sides that sliding block is contacted with the feather key and is respectively arranged with backing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257814.8A CN109079035A (en) | 2018-10-26 | 2018-10-26 | A kind of retaining ring finishing mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257814.8A CN109079035A (en) | 2018-10-26 | 2018-10-26 | A kind of retaining ring finishing mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109079035A true CN109079035A (en) | 2018-12-25 |
Family
ID=64844248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811257814.8A Pending CN109079035A (en) | 2018-10-26 | 2018-10-26 | A kind of retaining ring finishing mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109079035A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207193A (en) * | 2020-10-20 | 2021-01-12 | 东风汽车有限公司 | Continuous machining forming die for conical check ring |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497094A (en) * | 2009-03-05 | 2009-08-05 | 河南省宏源车轮有限公司 | Technology for manufacturing retaining ring for wheel of wheeled engineering machinery and special-purpose mold thereof |
| CN201361653Y (en) * | 2009-03-05 | 2009-12-16 | 河南省宏源车轮有限公司 | Locked groove ring finishing die for wheeled-type engineering machinery wheel |
| CN203002935U (en) * | 2012-11-14 | 2013-06-19 | 舒群 | Drawing mould with under-mounted convex mould |
| CN203281743U (en) * | 2013-06-20 | 2013-11-13 | 河南省宏源车轮有限公司 | Mould for lock ring for multi-piece type minitype engineering vehicle wheel |
| CN203437521U (en) * | 2013-09-06 | 2014-02-19 | 亿森（上海）模具有限公司 | Double-action double-angle side shaping mechanism for outer covering part |
| CN203635774U (en) * | 2013-12-31 | 2014-06-11 | 蚌埠捷顺机器有限公司 | Rim finishing die |
| CN208929036U (en) * | 2018-10-26 | 2019-06-04 | 宏源精工车轮股份有限公司 | A kind of retaining ring finishing mold |
-
2018
- 2018-10-26 CN CN201811257814.8A patent/CN109079035A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497094A (en) * | 2009-03-05 | 2009-08-05 | 河南省宏源车轮有限公司 | Technology for manufacturing retaining ring for wheel of wheeled engineering machinery and special-purpose mold thereof |
| CN201361653Y (en) * | 2009-03-05 | 2009-12-16 | 河南省宏源车轮有限公司 | Locked groove ring finishing die for wheeled-type engineering machinery wheel |
| CN203002935U (en) * | 2012-11-14 | 2013-06-19 | 舒群 | Drawing mould with under-mounted convex mould |
| CN203281743U (en) * | 2013-06-20 | 2013-11-13 | 河南省宏源车轮有限公司 | Mould for lock ring for multi-piece type minitype engineering vehicle wheel |
| CN203437521U (en) * | 2013-09-06 | 2014-02-19 | 亿森（上海）模具有限公司 | Double-action double-angle side shaping mechanism for outer covering part |
| CN203635774U (en) * | 2013-12-31 | 2014-06-11 | 蚌埠捷顺机器有限公司 | Rim finishing die |
| CN208929036U (en) * | 2018-10-26 | 2019-06-04 | 宏源精工车轮股份有限公司 | A kind of retaining ring finishing mold |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207193A (en) * | 2020-10-20 | 2021-01-12 | 东风汽车有限公司 | Continuous machining forming die for conical check ring |
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