CN109261806B - Positioning structure of drawing die, die and forming method of positioning structure - Google Patents
Positioning structure of drawing die, die and forming method of positioning structure Download PDFInfo
- Publication number
- CN109261806B CN109261806B CN201811464556.0A CN201811464556A CN109261806B CN 109261806 B CN109261806 B CN 109261806B CN 201811464556 A CN201811464556 A CN 201811464556A CN 109261806 B CN109261806 B CN 109261806B
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- circle
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- positioning structure
- plate
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000009286 beneficial effect Effects 0.000 abstract description 8
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 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
-
- 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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to the technical field of dies, in particular to a positioning structure of a drawing die, a die and a forming method of the positioning structure. The positioning structure of the drawing die comprises a base and a positioning plate, wherein the outer side of the positioning plate is provided with a connecting part, the connecting part is connected with the base, the inner side of the positioning plate is provided with a positioning part, and the positioning part is an arc-shaped surface matched with the movement track of the end part in the product forming process. The beneficial effects of the invention are as follows: the positioning part with the arc-shaped structure is arranged to enable the plate material of the automobile panel to be always in contact with the positioning part in the forming process, so that the movement is avoided, the positioning stability is improved, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of dies, in particular to a positioning structure of a drawing die, a die and a forming method of the positioning structure.
Background
In the existing automobile covering part products, the positioning of the product in the drawing forming process is difficult, particularly the products such as the back door inner and outer plates, the trunk inner and outer plates and the like, in the forming process, the flat plate material is gradually formed into an inverted V-shaped structure, the fluctuation is large, and the product with large fluctuation is easy to generate uncontrollable movement, so that the positioning is very unreliable, and the drawing quality defect is generated. At present, the conventional positioning structure is a linear positioning structure, but the linear positioning structure can not meet the positioning requirement, and the problems of movement, unstable positioning and the like of plate input still easily occur, so that the molding quality and appearance of the product are influenced.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a positioning structure of a drawing die, a die and a molding method of the positioning structure, which are used for solving the problems of unstable positioning, easy movement, poor product quality and the like in the production process of automobile panels in the prior art.
In order to achieve the above and other related objects, the present invention provides a positioning structure of a drawing die, comprising a base and a positioning plate, wherein the outer side of the positioning plate is a connecting part, the connecting part is connected with the base, the inner side of the positioning plate is a positioning part, and the positioning part is an arc-shaped surface matched with the movement track of the end part in the product forming process.
The beneficial effects of the invention are as follows: the positioning part with the arc-shaped structure is arranged to enable the plate material of the automobile panel to be always in contact with the positioning part in the forming process, so that the movement is avoided, the positioning stability is improved, and the product quality is improved.
Further, a first mounting hole is formed in the connecting portion, and the connecting portion penetrates through the first mounting hole through the locking piece to be connected with the base.
Further, the first mounting hole is a bar-shaped hole arranged along the horizontal direction.
The beneficial effects of adopting the further scheme are as follows: the positioning plate can be moved and adjusted in the horizontal direction, positioning is convenient, plates with different lengths can be adapted, and the application range is wider.
Further, the top of base articulates through the rotation round pin has and lifts the balancing piece, it is holding in the palm the material end to lift the one end that the balancing piece is close to the location portion, and the other end is the counter weight end, and the counter weight end passes through the minimum position of locating pin restriction counter weight end pivoted, and when counter weight end and locating pin cooperation, hold in the palm the material end top and be the level.
Further, a guide part for guiding the plate to fall into the positioning part is arranged at the top of the base.
The beneficial effects of adopting the further scheme are as follows: the guide part is favorable for accurately falling into the positioning structure, the lifting balance support is used for preventing the plate from tilting due to unequal gravity at two ends, the plate is favorable for keeping balance, and the positioning accuracy is improved.
The die comprises a male die, wherein a blank holder is arranged at the edge of the male die, the die further comprises the positioning structure, at least one positioning structure is arranged on the blank holder, and the positioning part of the positioning structure faces towards the end part of a product.
The beneficial effects of the invention are as follows: the die has simple structure and accurate positioning, is beneficial to improving the product quality and avoids mess channeling in the product forming process.
A shaping method of positioning structure simulates the motion track of the end of plate in shaping process, and selects multiple points of motion track to connect to form the arc surface of positioning part,
selecting a reference section;
repeatedly drawing a circle to confirm a locating point;
and connecting all positioning points to form an arc line.
Further, when the reference section is selected, a positioning structure with the outline of the positioning part to be determined is firstly installed on the blank holder, the plate is horizontally arranged on the positioning structure, and any section which simultaneously longitudinally penetrates through the positioning part, the plate and the blank holder is selected as the reference section.
Further, repeatedly drawing a circle to confirm a locating point, firstly drawing a first circle, drawing a first circle by taking the highest intersection point of a plate line and a blank holder on a reference section as the center of the first circle and taking the distance from the highest intersection point to the end point of one end of the plate as a radius, taking a plurality of reference points from the end point of the plate along the vertical downward direction, wherein each reference point is used as a locating point of an arc along the intersection point of the horizontal direction and the first circle; and drawing a subsequent circle, namely taking the last datum point of the previous circle as a starting datum point of the subsequent circle, taking the intersection point of the datum point and the previous circle along the horizontal direction as a starting locating point of the subsequent circle, taking the intersection point of the connecting line of the starting locating point and the circle center of the previous circle and the blank holder as the circle center of the subsequent circle, drawing the subsequent circle by taking the distance from the circle center to the starting locating point as the radius, taking a plurality of datum points from the starting datum point of the circle along the vertical downward direction, taking the intersection point of each datum point and the circle along the horizontal direction as a locating point of an arc line, and repeatedly drawing the circle until the plurality of locating points are connected to form the arc line.
Further, when the datum points are selected, the datum points are selected in the vertical direction in the sequence from top to bottom, and the distances between two adjacent datum points in the vertical direction are equal.
The beneficial effects of the invention are as follows: the operation method is simple and convenient, the positioning point determination accuracy is high, the matching degree of the arc-shaped surface and the plate movement track is improved, and the positioning effect is improved.
Drawings
FIG. 1 is a schematic view showing a first state of a positioning structure of a drawing die according to an embodiment of the invention;
FIG. 2 is a schematic view showing a second state of a positioning structure of a drawing die according to an embodiment of the invention;
FIG. 3 shows a top view of a mold according to an embodiment of the invention;
FIG. 4 shows a cross-sectional view of A-A in FIG. 3;
FIG. 5 is an enlarged schematic view of portion B of FIG. 4;
fig. 6 shows an enlarged schematic view of the portion C of fig. 4.
Description of the part reference numerals
11. A male die;
12. edge pressing rings;
2. a positioning structure;
3. a base;
31. a guide part;
32. a rotation pin;
33. a limiting pin;
4. a positioning plate;
41. a positioning part;
42. a locking member;
43. a first mounting hole;
5. lifting the balance weight;
51. a counterweight end;
52. a material supporting end;
6. a first circle;
7. a second circle;
8. a third circle;
9. and (5) plate materials.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
The terms such as "upper", "lower", "left", "right", "middle" and "a" and the like are also used in the present specification for convenience of description, but are not intended to limit the scope of the present invention, and the relative changes or modifications thereof are not limited to essential changes in technical content, but are also regarded as the scope of the present invention.
Before describing embodiments of the present invention in detail, an application environment of the present invention will be described. The technology of the invention is mainly applied to the mould, in particular to the drawing mould. The invention solves the problem of unstable positioning of some products with larger fluctuation in the automobile covering part products, in particular to V-shaped products such as back door inner and outer plates, trunk inner and outer plates and the like, and the positioning of two ends of a product plate is difficult in the forming process due to the larger fluctuation.
As shown in fig. 1 and 2, the positioning structure of the drawing die in the embodiment of the invention comprises a base 3 and a positioning plate 4, wherein a connecting part is arranged on the outer side of the positioning plate 4 and is connected with the base 3, a first mounting hole 43 is formed in the connecting part, and the connecting part passes through the first mounting hole 43 through a locking piece 42 and is connected with the base 3. The locking member 42 may be a screw and provided with a washer to provide a more stable and secure locking. The first mounting hole 43 may be a bar hole arranged along a horizontal direction, and the positioning plate 4 can be adjusted in position along the horizontal direction by adopting the bar hole, so that the positioning precision of the positioning plate and a plate material is improved. The inner side of the positioning plate 4 is provided with a positioning part 41, the positioning part 41 is an arc surface matched with the movement track of the end part in the product plate forming process, the arc surface is adopted to ensure that the plate is always contacted with the positioning part in the deformation process, the overlarge gap between the end part of the plate and the positioning part is avoided, and the positioning accuracy is improved.
As shown in fig. 1 and 2, a guiding part 31 for guiding the plate to fall into the positioning part is arranged at the top of the base 3, and an opening at the upper end of the guiding part 31 is outwards expanded, so that the plate is conveniently guided to be put in. The top of base 3 still is equipped with lifts balancing piece 5, lifts balancing piece 5 and hinges through the top of round pin 32 and base, and the one end that lifts balancing piece 5 is close to location portion 4 is holds in the palm material end 52, and the other end is counter weight end 51, still installs spacer pin 33 on the base 3, and counter weight end 51 passes through the minimum position of spacer pin 33 restriction counter weight end 51 pivoted, and when counter weight end 51 and spacer pin 33 cooperation, hold in the palm material end 52 top and be the level for the sheet material initially places when holding in the material end, and the sheet material remains the horizontality. When the sheet material is placed above the material supporting end, the weight of the counterweight end is greater than the weight of the sheet material, the sheet material is supported and lifted, when the upper die pressure of the die is downward, the sheet material is simultaneously pressed downward, when the downward pressure is greater than the gravity of the counterweight end, the material supporting end rotates downward around the rotating pin, and when rotating, the material supporting end gradually descends and shortens the contact distance with the sheet material until the sheet material completely falls into the positioning part, so that the sheet material is stably positioned all the time in the whole process of forming, the shaking and the moving are avoided, and the product forming quality is improved.
As shown in fig. 3 and fig. 4, the die of the embodiment of the invention comprises a male die 11, a blank holder 12 is arranged at the edge of the male die 11, the die also comprises the positioning structure 2, at least one positioning structure 2 is arranged on the blank holder 12, the number of the positioning structures 2 is selected and arranged according to specific requirements, and the positioning part 41 of the positioning structure 4 faces the end part of the product plate 9, so that the end part of the plate 9 is positioned through the positioning part 41 in the forming process, and the shaking and the random channeling are avoided.
As shown in fig. 1 to 6, the forming method of the positioning structure according to the embodiment of the present invention is used for determining a specific shape of a positioning portion of the positioning structure, and by simulating a movement track of an end portion of a plate 9 during a forming process, and selecting a plurality of points of the movement track to connect to form an arc surface of the positioning portion, the forming method includes the following steps: selecting a reference section; repeatedly drawing a circle to confirm a locating point; and connecting all positioning points to form an arc line. When the reference section is selected, the positioning structure with the outline of the positioning part to be determined is firstly installed on the blank holder 12, the plate 9 is horizontally arranged on the material supporting end of the positioning structure, and any section which simultaneously longitudinally penetrates through the positioning part 41, the plate 9 and the blank holder 12 is selected as the reference section, and in the embodiment, the section A-A is taken as the reference for specific explanation.
As shown in fig. 1 to 6, a reference point is repeatedly drawn on the same section, a first circle is drawn first, the highest intersection point O1 of a plate line and a blank holder on the reference section A-A is used as the center of the first circle 6, the distance R1 from the highest intersection point O1 to the endpoint Z1 of one end of the plate in the initial state is used as the radius, and the endpoint Z1 is the initial locating point A1 of the arc of the section of the locating part. Then, a plurality of datum points are taken along the vertical downward direction of the plate endpoint Z1, when the datum points are selected, the datum points are selected in the vertical direction in the sequence from top to bottom, and the intersection point of each datum point along the horizontal direction and the first circle is the locating point of the arc line. And drawing a subsequent circle, namely taking the last datum point of the previous circle as a starting datum point of the subsequent circle, taking the intersection point of the datum point and the previous circle along the horizontal direction as a starting locating point of the subsequent circle, taking the intersection point of the connecting line of the starting locating point and the circle center of the previous circle and the blank holder as the circle center of the subsequent circle, drawing the subsequent circle by taking the distance from the circle center to the starting locating point as the radius, taking a plurality of datum points along the vertical downward direction by taking the starting datum point of the circle, taking the intersection point of each datum point and the circle along the horizontal direction as a locating point of an arc line, repeatedly drawing the circle to obtain a plurality of locating points, and smoothly connecting the locating points to form the arc line. The distance H between two adjacent datum points in the vertical direction can be equal, the number of the datum points and the distance between the adjacent datum points can be selected and set according to the requirement on the arc precision, the distance between the two adjacent datum points can be 5-20 mm, 10-15 datum points can be generally taken to confirm corresponding positioning points, and each positioning point is connected to form a section of an arc.
As shown in fig. 4 to 6, in this embodiment, the height S of the supporting end plate from the bottom of the base is about 213mm, that is, the supporting height is about 213mm, the distance between two adjacent reference points may be 20mm, 11 reference points may be taken on the supporting height, when a first circle is drawn, the highest intersection O1 of the plate line on the reference section A-A and the blank holder is taken as the center of the first circle 6, the first circle 6 is drawn with the distance R1 from the highest intersection O1 to the endpoint Z1 of one end of the plate in the initial state, the endpoints Z1 of the plate sequentially take the reference points Z2, Z3 and Z4 along the vertical downward direction, and the horizontal line extending along the horizontal direction of each reference point and the first circle generate corresponding intersection points A2, A3 and A4, and the intersection points A2, A3 and A4 are the locating points of the arc. The last datum point (datum point Z4) of the previous circle (first circle 6) is taken as the starting datum point of the next circle (second circle 7), the intersection point A4 of the datum point Z4 and the previous circle (first circle 6) is taken as the starting locating point of the next circle (second circle 7), the intersection point O2 of the connecting line of the starting locating point and the previous circle (first circle 6) and the blank holder is taken as the center of the next circle (second circle 7), the distance R2 from the center O2 to the starting locating point is taken as the radius to draw the next circle (second circle 7), the starting datum point Z4 of the circle sequentially takes the datum points Z5, Z6, Z7, Z8 and Z9 along the vertical downward direction, and the intersection points A5, A6, A7, A8 and A8 of the corresponding arcs are generated by the horizontal line of each datum point and the circle (second circle 7). The steps are repeated to continue drawing the next circle, the last datum point (the datum point Z9) of the previous circle (the second circle 7) is used as the initial datum point of the next circle (the third circle 8) and the intersection point A9 of the datum point Z9 and the previous circle (the second circle 7) is used as the initial locating point of the next circle (the third circle 8), the intersection point O3 of the connecting line of the initial locating point and the previous circle (the second circle 7) and the pressing ring is used as the center of the next circle (the third circle 8), the distance R3 from the center O3 to the initial locating point is used as the radius of the next circle (the third circle 8), Z10 and Z11 are sequentially taken in the vertical downward direction by the initial datum point Z9 of the circle, each datum point extending along the horizontal direction is used as the initial locating point A11 and A11 of the next circle (the third circle 8), the intersection point A10 and A11 are selected as the points of the connecting points of the next circle and the pressing ring, the number of the connecting points is more than the arc points are selected according to the number of the required points, and the number of the points to be drawn on the curve points is more, and the number of the points to be matched with the number of the locating points is selected. After the determination of one section arc line is completed, selecting a new section for repeated operation, and finally determining the arc surface of the positioning part.
The forming method has simple operation steps, and the matching degree of the arc surface determined by the forming method and the movement track of the end part of the plate is high, thereby being beneficial to improving the positioning precision and ensuring the product quality.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (8)
1. A forming method of a positioning structure is characterized in that: the method is used for determining the shape of the positioning part of the positioning structure, the positioning structure is arranged on the blank holder arranged at the edge of the male die, the positioning part of the positioning structure faces the end part of the plate, the arc-shaped surface of the positioning part is formed by simulating the movement track of the end part of the plate in the forming process and selecting a plurality of points of the movement track to connect,
selecting a reference section;
repeatedly drawing a circle to confirm a locating point, firstly drawing a first circle, taking the highest intersection point of a plate line on a reference section and a blank holder as the center of the first circle, drawing the first circle by taking the distance from the highest intersection point to the endpoint of one end of the plate as a radius, taking a plurality of reference points on the endpoint of the plate along the vertical downward direction, and taking the intersection point of each reference point and the first circle along the horizontal direction as the locating point of an arc line; drawing a next circle, namely taking the last datum point of the previous circle as a starting datum point of the next circle, taking the intersection point of the datum point and the previous circle along the horizontal direction as a starting locating point of the next circle, taking the intersection point of a connecting line of the starting locating point and the circle center of the previous circle and a blank holder as the circle center of the next circle, drawing the next circle by taking the distance from the circle center to the starting locating point as a radius, taking a plurality of datum points along the vertical downward direction by taking the starting datum point of the circle, taking the intersection point of each datum point and the circle along the horizontal direction as a locating point of an arc line, and repeatedly drawing the circle until the plurality of locating points are connected to form the arc line;
and connecting all positioning points to form an arc line.
2. The method of forming a positioning structure according to claim 1, wherein: when the reference section is selected, a positioning structure with the outline of the positioning part to be determined is firstly arranged on the blank holder, the plate is horizontally arranged on the positioning structure, and any section which longitudinally penetrates through the positioning part, the plate and the blank holder simultaneously is selected as the reference section.
3. The method of forming a positioning structure according to claim 1, wherein: when the datum points are selected, the datum points are selected in the vertical direction in sequence from top to bottom, and the distances between two adjacent datum points in the vertical direction are equal.
4. The method of forming a positioning structure according to claim 1, wherein: the positioning structure comprises a base and a positioning plate, wherein the outer side of the positioning plate is a connecting part, the connecting part is connected with the base, the inner side of the positioning plate is the positioning part, and the positioning part is an arc-shaped surface matched with the movement track of the end part in the product forming process.
5. The method of forming a positioning structure according to claim 4, wherein: the connecting part is provided with a first mounting hole, and the connecting part passes through the first mounting hole through the locking piece and is connected with the base.
6. The method of forming a positioning structure according to claim 5, wherein: the first mounting hole is a strip-shaped hole arranged along the horizontal direction.
7. The method of forming a positioning structure according to claim 4, wherein: the top of base articulates through the rotation round pin has and lifts the balancing piece, it holds in the palm the material end to lift the one end that the balancing piece is close to the location portion, and the other end is the counter weight end, and the counter weight end passes through the minimum position of locating pin restriction counter weight end pivoted, and when counter weight end and locating pin cooperation, hold in the palm the material end top to be the level.
8. The method of forming a positioning structure according to claim 4, wherein: the top of base is equipped with the guiding part that is used for guiding the sheet material to fall into location portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811464556.0A CN109261806B (en) | 2018-12-03 | 2018-12-03 | Positioning structure of drawing die, die and forming method of positioning structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811464556.0A CN109261806B (en) | 2018-12-03 | 2018-12-03 | Positioning structure of drawing die, die and forming method of positioning structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109261806A CN109261806A (en) | 2019-01-25 |
| CN109261806B true CN109261806B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811464556.0A Active CN109261806B (en) | 2018-12-03 | 2018-12-03 | Positioning structure of drawing die, die and forming method of positioning structure |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110560572A (en) * | 2019-08-16 | 2019-12-13 | 中国第一汽车股份有限公司 | Plate positioning device with limiting block |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU997911A1 (en) * | 1980-12-16 | 1983-02-23 | Ленинградский Ордена Трудового Красного Знамени Институт Точной Механики И Оптики | Die for drawing without clamp box-shaped parts from square blanks with rounded angles |
| CN103100597A (en) * | 2011-11-15 | 2013-05-15 | 北汽福田汽车股份有限公司 | Positioning mechanism for die and pouching die |
| CN204975070U (en) * | 2015-09-17 | 2016-01-20 | 无锡明豪汽车轻量化技术应用有限公司 | Mould positioning mechanism |
| CN206898202U (en) * | 2017-05-11 | 2018-01-19 | 深圳市国成辉塑胶模具有限公司 | Automobile die plate detent mechanism |
| CN209156896U (en) * | 2018-12-03 | 2019-07-26 | 重庆平伟汽车科技股份有限公司 | A kind of location structure of drawing die, mold |
-
2018
- 2018-12-03 CN CN201811464556.0A patent/CN109261806B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU997911A1 (en) * | 1980-12-16 | 1983-02-23 | Ленинградский Ордена Трудового Красного Знамени Институт Точной Механики И Оптики | Die for drawing without clamp box-shaped parts from square blanks with rounded angles |
| CN103100597A (en) * | 2011-11-15 | 2013-05-15 | 北汽福田汽车股份有限公司 | Positioning mechanism for die and pouching die |
| CN204975070U (en) * | 2015-09-17 | 2016-01-20 | 无锡明豪汽车轻量化技术应用有限公司 | Mould positioning mechanism |
| CN206898202U (en) * | 2017-05-11 | 2018-01-19 | 深圳市国成辉塑胶模具有限公司 | Automobile die plate detent mechanism |
| CN209156896U (en) * | 2018-12-03 | 2019-07-26 | 重庆平伟汽车科技股份有限公司 | A kind of location structure of drawing die, mold |
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| CN109261806A (en) | 2019-01-25 |
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