CN106694710A - Automobile side wall outer plate drawing die provided with auxiliary drawing male die - Google Patents
Automobile side wall outer plate drawing die provided with auxiliary drawing male die Download PDFInfo
- Publication number
- CN106694710A CN106694710A CN201611086482.2A CN201611086482A CN106694710A CN 106694710 A CN106694710 A CN 106694710A CN 201611086482 A CN201611086482 A CN 201611086482A CN 106694710 A CN106694710 A CN 106694710A
- Authority
- CN
- China
- Prior art keywords
- plate
- die
- auxiliary
- wall outer
- blank holder
- 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
- 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
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- 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
-
- 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
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Abstract
The invention discloses an automobile side wall outer plate drawing die provided with an auxiliary drawing male die. The automobile side wall outer plate drawing die provided with the auxiliary drawing male die comprises an upper die holder, a lower die holder and a blank holder. The upper die holder is provided with a drawing female die. The lower die holder is correspondingly provided with a drawing male die matched with the drawing female die. The drawing male die is arranged inside the blank holder and connected with the blank holder in a sliding manner. The auxiliary drawing male die is arranged on the lower die holder. The auxiliary drawing male die is located between the drawing male die and the blank holder and connected with the blank holder in a sliding manner. The auxiliary drawing male die is opposite to the connection site of the automatic side wall outer plate, a back cover and a back air window. According to the automobile side wall outer plate drawing die provided with the auxiliary drawing male die, because the auxiliary drawing male die is arranged between the drawing male die and the blank holder, in the early period of drawing forming, the auxiliary drawing male die can allow plate materials to flow in, and the situation that the plate materials are drawn broken because the plate materials are excessively thin is avoided; and in the later period of drawing forming, the auxiliary drawing male die can prevent outside plate materials from flowing in and can also have the function of drawing the plate materials from the inner side to the outer side, and therefore deformation of the plate materials opposite to the connection site is more sufficient.
Description
Technical field
The invention belongs to Automobile Cover Drawing Die technical field, more particularly to a kind of vapour with auxiliary drawing punch
Car side-wall outer-plate drawing die.
Background technology
At present, people to the pursuit of Automobile Body Modeling based on mellow and full, streamline moulding, and the change of Automobile Body Modeling
Change also improves the manufacture difficulty of automobile panel.Vehicle side-wall outer-plate is one of important covering of automobile, as shown in figure 1,
There is obvious Curvature varying in vehicle side-wall outer-plate, the type face has from convex with the type face at the overlapping regions of rear air regulator and bonnet
The tendency on convex surface is arrived in face to concave surface again, and, the parting of the region part is nor straight line, but the curve of anti-recessed tendency.Cause
This, during the drawing and moulding of plate, easily there is the problem that sheet metal deformation is insufficient, drawing and moulding is uneven in this region, makes
Obtain the vehicle side-wall outer-plate after drawing and moulding and dark hole easily occur in this region.
In order to solve the above-mentioned technical problem, the method that technical staff adjusts frequently with bead or adjusting process supplements shape
The thinning rate of plate to increase the region, wherein：
Bead adjustment be by increasing the resistance between plate and drawing die, so as to reach control panel material influx,
Make sheet metal deformation more fully purpose, the method can to a certain extent increase thinning rate, but there is three below defect：
First, because the drawing depth in the region is deeper, so that a certain amount of plate is flowed into, will otherwise occur plate by drawing crack
Situation, now the enhancing nargin of bead is limited；Second, in actual production process, when particularly producing in enormous quantities, if
There is stronger bead in the position flowed into plate, will make bead heavy wear, in order to ensure being smoothed out for production,
Be accomplished by carrying out artificial Welding Repair to bead, not only increase workload, reduce production efficiency, and bead length
Phase repairs the durability that can also influence drawing die；3rd, when plate passes through stronger reinforcement, the rolled tin on plate can be made
It is more easy to fall off, thus need arrestment to clear up mould during production, and also add reprocessing for part
Rate.
The method of adjusting process supplement shape is to increase the region by designing technique supplement shape in the region
Thinning rate, but effect on driving birds is not good, if because technique supplement shape it is excessive, easily cause the drawing crack or corrugation of part, and
If technique supplement shape is too small, playing a part of will be limited, can not equally reach the purpose of optimization.
Therefore, be badly in need of provide it is a kind of can not only avoid plate by drawing crack, and make plate with vehicle side-wall outer-plate with
The deformation of the connection position relative position of bonnet and rear air regulator more fully vehicle side-wall outer-plate drawing die.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of can not only avoid plate by drawing crack, and plate is existed
Deformation more fully vehicle side-wall outer-plate with the connection position relative position of air regulator and bonnet after vehicle side-wall outer-plate and automobile draws
Prolong mould.
To solve the above problems, the technical solution adopted by the present invention content is specific as follows：
A kind of vehicle side-wall outer-plate drawing die with auxiliary drawing punch, including upper bolster, die shoe and blank holder,
Drawing cavity plate is provided with the upper bolster, is correspondingly arranged on the die shoe convex with the drawing that the drawing cavity plate is engaged
Mould, the drawing punch is arranged on the blank holder inside and is slidably connected with the blank holder, is additionally provided with the die shoe
Auxiliary drawing punch, the auxiliary drawing punch is located between the drawing punch and the blank holder and is slided with the blank holder
Dynamic connection, and the auxiliary drawing punch is relative with the connection position of air regulator after automobile and bonnet with vehicle side-wall outer-plate；It is described
The auxiliary drawing cavity plate being engaged with the auxiliary drawing punch is correspondingly arranged on upper bolster.
Further, the height of the height less than the drawing punch of the auxiliary drawing punch.
Further, the upper surface of the blank holder is provided with bead.
Preferably, the bead includes being arranged on the groove of the blank holder upper surface and is correspondingly arranged at described
On drawing cavity plate and with the convex tendon of the fit depressions.
Further, it is provided with guide between the auxiliary drawing punch and the blank holder.
Further, the guide is the guide plate for being arranged on the auxiliary drawing punch both sides.
Further, the guide plate is detachably connected on the both sides of the auxiliary drawing punch.
Further, the guide plate is connected to the both sides of the auxiliary drawing punch by screw or pin.
Further, the auxiliary drawing punch is detachably connected on the die shoe.
Further, the auxiliary drawing punch is connected on the die shoe by screw or pin.
Compared to existing technology, the beneficial effects of the present invention are：
The present invention between the drawing punch and the blank holder by being provided with auxiliary drawing punch so that the vapour
In the early stage of drawing and moulding, the auxiliary drawing punch can allow plate to flow inward into, make plate car side-wall outer-plate drawing die
Material will not the drawing crack because of excessively thinning；And in the drawing and moulding later stage, the auxiliary drawing punch can not only prevent outer panel
The inflow of material, and may also operate as by the effect of Inside To Outside drawing plate so that with the connection position relative position
Sheet metal deformation is more abundant.And, the auxiliary drawing punch, in the absence of the problem of heavy wear, makes during drawing and moulding
The drawing die durability degree is good, stability is high, so as to improve production efficiency.
In addition, the vehicle side-wall outer-plate drawing die is in drawing and moulding later stage, the bead and auxiliary drawing punch
Can play a role simultaneously, so as to ensure that plate is relatively controllable during drawing and moulding, it is to avoid plate goes out in forming process
Situations such as now distorting, fluctuate, and then prevent the vehicle side-wall outer-plate of drawing and moulding from major defect occur.
Described above is only the general introduction of technical solution of the present invention, in order to better understand technological means of the invention,
And can be practiced according to the content of specification, and in order to allow the above and other objects, features and advantages of the invention can
Become apparent, below especially exemplified by more preferably embodiment, and coordinate accompanying drawing, describe in detail as follows.
Brief description of the drawings
Fig. 1 is the schematic shapes of vehicle side-wall outer-plate；
Fig. 2 is the assembling schematic diagram of auxiliary drawing punch of the present invention and die shoe；
Fig. 3 is schematic diagram when upper bolster of the present invention starts to contact with blank holder；
Fig. 4 is schematic diagram when plate of the present invention starts to contact with auxiliary drawing punch；
Fig. 5 is the schematic diagram that the upper bolster of drawing die of the present invention and die shoe are closed completely；
Fig. 6 is the structural representation of the top profile with size of auxiliary drawing punch of the present invention；
Wherein, the description of reference numerals in Fig. 1 to Fig. 6 is as follows：
1st, upper bolster；2nd, die shoe；3rd, drawing cavity plate；4th, drawing punch；5th, drawing cavity plate is aided in；6th, auxiliary drawing is convex
Mould；7th, blank holder；8th, guide plate；9th, die parting line；10th, top radius of corner；11st, plate；12nd, connection position.
Specific embodiment
Further to illustrate the present invention to reach the technological means that expected goal of the invention is taken, below in conjunction with accompanying drawing and
More preferably embodiment, to according to specific embodiment of the invention, structure and feature, describing in detail as follows：
As shown in figure 3, the vehicle side-wall outer-plate drawing die with auxiliary drawing punch 6 of the present invention includes upper mould
Seat 1, die shoe 2 and blank holder 7, are provided with drawing cavity plate 3 on the upper bolster 1, be correspondingly arranged on the die shoe 2 and institute
State the drawing punch 4 that drawing cavity plate 3 is engaged, the drawing punch 4 be arranged on the inside of the blank holder 7 and with the flanging
Circle 7 is slidably connected.In order to avoid plate 11 during drawing and moulding by drawing crack, while make plate 11 with vehicle side-wall outer-plate
Deformation with the relative position of connection position 12 of bonnet and rear air regulator is more abundant, and auxiliary drawing punch is provided with the die shoe 2
6, the auxiliary drawing punch 6 is arranged between the drawing punch 4 and the blank holder 7 and is slided with the blank holder 7 and connects
Connect, the auxiliary drawing cavity plate 5 being engaged with the auxiliary drawing punch 6 is correspondingly arranged on the upper bolster 1, and it is described auxiliary
Help drawing punch 6 relative with the connection position 12.
In order to avoid the auxiliary drawing punch 6 produces influence, the auxiliary to the overall drawing and moulding of automobile side outside plate
The height of drawing punch 6 is less than the height of the drawing punch 4, so that the auxiliary drawing punch 6 is outside vehicle side
Plate drawing and moulding starts to play a role when being nearly completed, and not only reduces the vehicle side-wall outer-plate drawing die drawing and moulding
Unstability, the drawing depth for being additionally, since vehicle side-wall outer-plate is deeper, and the auxiliary drawing punch 6 is in vehicle side-wall outer-plate
Starting to play a role when drawing and moulding is nearly completed can also avoid plate 11 from being more easy to by drawing crack during drawing and moulding.
In the present embodiment, the upper surface of the blank holder 7 is provided with bead, and specifically, the bead includes setting
Put the upper surface of the blank holder 7 groove and be correspondingly arranged on the drawing cavity plate 3 and with the fit depressions
Convex tendon.After the upper bolster 1 is moved downward and clamps plate 11 with blank holder 7 with press slide, the convex tendon and groove
Engaging so that the border of plate 11 is in locking state, so that plate 11 keeps stabilization during drawing and moulding, and
And, during the drawing and moulding of plate 11, the bead is also prevented from plate 11 and flows inward into, and makes plate 11 in drawing
The initial stage of shaping fully deforms.In addition, in the later stage of drawing and moulding, because the bead is sent out with auxiliary drawing punch 6 simultaneously
The effect of waving, thereby may be ensured that plate 11 is relatively controllable during drawing and moulding, it is to avoid plate 11 goes out in forming process
Situations such as now distorting, fluctuate, and then prevent major defect occur through the vehicle side-wall outer-plate of drawing and moulding.
As shown in Fig. 2 in order to realize that the blank holder 7 aids in being slidably connected for drawing punch 6 with described, the auxiliary is drawn
Prolong and be provided with guide between punch-pin 6 and the blank holder 7.Specifically in the present embodiment, the guide is described to be arranged on
The guide plate 8 of auxiliary drawing punch 6 both sides.The installation of the guide plate 8 and dismounting for convenience, the guide plate 8 is detachably connected on
The both sides of the auxiliary drawing punch 6, are improved as one kind of the present embodiment, and the guide plate 8 is connected to by screw or pin
The both sides of the auxiliary drawing punch 6.
The installation and dismounting of the auxiliary drawing punch 6 for convenience, the removable dismounting of auxiliary drawing punch 6 is connected to
On the die shoe 2, improved as one kind of the present embodiment, the auxiliary drawing punch 6 is connected to institute by screw or pin
State on die shoe 2.
The drawing process of the vehicle side-wall outer-plate drawing die with auxiliary drawing punch 6 of the present invention is specific such as
Under：
Before drawing and moulding, the vehicle side-wall outer-plate drawing die is opened, plate 11 is placed on the blank holder 7
On, as shown in figure 3, the upper bolster 1 is moved downward in the presence of press slide, the upper bolster 1 starts to connect with blank holder 7
Touch, realize the clamping of plate 11, and the convex tendon engages with groove so that and the border of plate 11 is in locking state；Such as Fig. 4
Shown, the upper bolster 1 continues to move downward with blank holder 7 in the presence of press slide, plate 11 gradually with the auxiliary
Drawing punch 6 is contacted, and the auxiliary drawing punch 6 starts to play a role, and plate 11 starts to be acted on by by Inside To Outside
Power so that plate 11 is more abundant with the deformation of the relative position of the connection position 12；As described in Figure 5, the upper bolster 1 and flanging
Circle 7 continues to move downward in the presence of press slide, now, described until the upper bolster 1 is closed completely with die shoe 2
Drawing punch 4 is closed completely with drawing cavity plate 3, and the auxiliary drawing punch 6 is closed completely with auxiliary drawing cavity plate 5, and drawing is complete
Into.
The manufacture method of vehicle side-wall outer-plate drawing die of the present invention comprises the following steps：
Step one：It is determined that the drawing work boundary condition of stabilization
In order to ensure that the vehicle side-wall outer-plate drawing die can reach the state of process stabilizing, pressing direction, binder
The basic parameters such as face, pressure and technique supplement need adjusted design to finish.
Step 2：It is determined that the top profile and size of auxiliary drawing punch 6
In order to make the drawing die can adapt in the vehicle side-wall outer-plate with different gussets, as shown in fig. 6,
The die parting line 9 of the auxiliary drawing punch 6 is designed at connection position 12 first, then according to the drawing depth at connection position 12
And tendency, determine the auxiliary drawing punch 6 in the height of diverse location, the angle of both sides wall and top radius of corner 10
Deng.
Step 3：The top profile determined using molding simulation software pair is simulated checking with size
Checking, its mesh are simulated with size to the top profile that auxiliary drawing punch 6 determines using simulation shaping software
Be checking it is described auxiliary drawing punch 6 top profile can make plate 11 in the position relative with the connection position 12 with size
Put can reach fully deformation, while plate 11 be not in during drawing and moulding fracture, corrugation etc. phenomenon.Conventional
Simulation shaping software kit includes AutoForm and Dynaform etc..
Step 4：For simplation verification result, the auxiliary top profile of drawing punch 6 is modified with size
If the top profile that the result of simplation verification is to determine can meet requirement with size, into step 5；If
The top profile being to determine through the result of simplation verification can not meet requirement with size, then repeat step two and step 3, until
Empirical tests determine that the top profile of the auxiliary drawing punch 6 can meet requirement with size.
Step 5：Vehicle side-wall outer-plate drawing mold structure is designed according to correction result
Drawn according to the vehicle side-wall outer-plate is designed with size by the top profile of the auxiliary drawing punch 6 corrected repeatedly
Prolong the design drawing of mould.
Step 6：According to design drawing, vehicle side-wall outer-plate drawing die is manufactured and debugged.
Above-mentioned implementation method is only the preferred embodiment of the present invention, it is impossible to limit the scope of protection of the invention with this,
The change and replacement of any unsubstantiality that those skilled in the art is done on the basis of of the invention belong to institute of the present invention
Claimed scope.
Claims (10)
1. a kind of with the vehicle side-wall outer-plate drawing die for aiding in drawing punch, including upper bolster, die shoe and blank holder, institute
State and be provided with upper bolster drawing cavity plate, be correspondingly arranged on the die shoe convex with the drawing that the drawing cavity plate is engaged
Mould, the drawing punch is arranged on the blank holder inside and is slidably connected with the blank holder, it is characterised in that：The lower mould
Be additionally provided with auxiliary drawing punch on seat, the auxiliary drawing punch be located between the drawing punch and the blank holder and with institute
Blank holder is stated to be slidably connected, and the auxiliary drawing punch and vehicle side-wall outer-plate and the connection position phase of bonnet and rear air regulator
It is right；The auxiliary drawing cavity plate being engaged with the auxiliary drawing punch is correspondingly arranged on the upper bolster.
2. vehicle side-wall outer-plate drawing die as claimed in claim 1, it is characterised in that：The height of the auxiliary drawing punch
Less than the height of the drawing punch.
3. vehicle side-wall outer-plate drawing die as claimed in claim 1, it is characterised in that：The upper surface of the blank holder is set
There is bead.
4. vehicle side-wall outer-plate drawing die as claimed in claim 3, it is characterised in that：The bead includes being arranged on institute
State the groove of blank holder upper surface and be correspondingly arranged on the drawing cavity plate and with the convex tendon of the fit depressions.
5. vehicle side-wall outer-plate drawing die as claimed in claim 1, it is characterised in that：It is described auxiliary drawing punch with it is described
Guide is provided between blank holder.
6. vehicle side-wall outer-plate drawing die as claimed in claim 5, it is characterised in that：The guide is described to be arranged on
The guide plate of auxiliary drawing punch both sides.
7. vehicle side-wall outer-plate drawing die as claimed in claim 6, it is characterised in that：The guide plate is detachably connected on institute
State the both sides of auxiliary drawing punch.
8. vehicle side-wall outer-plate drawing die as claimed in claim 7, it is characterised in that：The guide plate passes through screw or pin
It is connected to the both sides of the auxiliary drawing punch.
9. the vehicle side-wall outer-plate drawing die as described in claim 1-8 any one, it is characterised in that：The auxiliary drawing
Punch-pin is detachably connected on the die shoe.
10. vehicle side-wall outer-plate drawing die as claimed in claim 9, it is characterised in that：The auxiliary drawing punch passes through
Screw or pin are connected on the die shoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611086482.2A CN106694710A (en) | 2016-11-30 | 2016-11-30 | Automobile side wall outer plate drawing die provided with auxiliary drawing male die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611086482.2A CN106694710A (en) | 2016-11-30 | 2016-11-30 | Automobile side wall outer plate drawing die provided with auxiliary drawing male die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106694710A true CN106694710A (en) | 2017-05-24 |
Family
ID=58935323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611086482.2A Pending CN106694710A (en) | 2016-11-30 | 2016-11-30 | Automobile side wall outer plate drawing die provided with auxiliary drawing male die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106694710A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716686A (en) * | 2017-11-30 | 2018-02-23 | 重庆平伟汽车科技股份有限公司 | Automobile panel drawing process and drawing die |
| CN108262404A (en) * | 2018-05-02 | 2018-07-10 | 上海实树汽车工程技术有限公司 | A kind of production method for manufacturing experimently automobile front door outside plate |
| CN110328278A (en) * | 2019-08-14 | 2019-10-15 | 哈尔滨工业大学 | A kind of large thin-wall curved-surface piece forming device and method |
| CN111672983A (en) * | 2020-06-19 | 2020-09-18 | 深圳数码模汽车技术有限公司 | Whole kickboard forming die of foundry goods |
| CN113680902A (en) * | 2021-07-15 | 2021-11-23 | 奇瑞商用车（安徽）有限公司 | Drawing die structure with driving male die and fixed male die and using method |
| CN114346045A (en) * | 2021-12-24 | 2022-04-15 | 安徽江淮福臻车体装备有限公司 | Processing die surface treatment method for drawing die |
| CN117399509A (en) * | 2023-12-11 | 2024-01-16 | 上海治臻新能源股份有限公司 | Draw bead and stamping die |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107716686A (en) * | 2017-11-30 | 2018-02-23 | 重庆平伟汽车科技股份有限公司 | Automobile panel drawing process and drawing die |
| CN107716686B (en) * | 2017-11-30 | 2024-03-26 | 重庆平伟汽车科技股份有限公司 | Automobile panel stretching process and stretching die |
| CN108262404A (en) * | 2018-05-02 | 2018-07-10 | 上海实树汽车工程技术有限公司 | A kind of production method for manufacturing experimently automobile front door outside plate |
| CN110328278A (en) * | 2019-08-14 | 2019-10-15 | 哈尔滨工业大学 | A kind of large thin-wall curved-surface piece forming device and method |
| CN110328278B (en) * | 2019-08-14 | 2020-06-23 | 哈尔滨工业大学 | Large thin-wall curved surface part forming device and method |
| CN111672983A (en) * | 2020-06-19 | 2020-09-18 | 深圳数码模汽车技术有限公司 | Whole kickboard forming die of foundry goods |
| CN113680902A (en) * | 2021-07-15 | 2021-11-23 | 奇瑞商用车（安徽）有限公司 | Drawing die structure with driving male die and fixed male die and using method |
| CN114346045A (en) * | 2021-12-24 | 2022-04-15 | 安徽江淮福臻车体装备有限公司 | Processing die surface treatment method for drawing die |
| CN114346045B (en) * | 2021-12-24 | 2023-08-29 | 安徽江福科技有限公司 | Processing die surface treatment method of drawing die |
| CN117399509A (en) * | 2023-12-11 | 2024-01-16 | 上海治臻新能源股份有限公司 | Draw bead and stamping die |
| CN117399509B (en) * | 2023-12-11 | 2024-04-05 | 上海治臻新能源股份有限公司 | Draw bead and stamping die |
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Application publication date: 20170524 |