CN213997423U - Multi-hole punching die for automobile silencer - Google Patents
Multi-hole punching die for automobile silencer Download PDFInfo
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- CN213997423U CN213997423U CN202023042438.6U CN202023042438U CN213997423U CN 213997423 U CN213997423 U CN 213997423U CN 202023042438 U CN202023042438 U CN 202023042438U CN 213997423 U CN213997423 U CN 213997423U
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- 238000004080 punching Methods 0.000 title claims abstract description 40
- 230000003584 silencer Effects 0.000 title claims description 7
- 230000003068 static effect Effects 0.000 claims abstract description 59
- 238000009434 installation Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000013459 approach Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The application relates to a multi-hole punching die for an automobile muffler, which comprises a static die and a movable die, wherein a driving mechanism for driving the movable die to be close to and far away from the static die is arranged on the static die, and a first punch for punching a product is arranged on one side of the movable die, which faces the static die; a guide rail is arranged on one side, facing the movable die, of the static die, the guide rail is connected with an installation seat in a sliding mode, and a second punch used for punching a product is arranged on the installation seat; the movable mould is provided with a linkage assembly, and the linkage assembly is used for converting an acting force for driving the movable mould to be close to and far away from the static mould into an acting force for driving the mounting seat to reciprocate on the guide rail. The method has the advantages that the multi-hole punching efficiency of the product is accelerated, and the production cost is reduced; and the double-layer shell of the product is punched simultaneously, so that the condition that the punched holes of the inner and outer shells are staggered can be reduced, and the yield of the product is improved.
Description
Technical Field
The application relates to the technical field of automobile part processing, in particular to a punching die for multiple holes of an automobile silencer.
Background
At present, in order to achieve good heat insulation and noise reduction effects, a double-layer shell stretching piece is generally adopted, a double-layer shell is drawn twice in the production process, trimming and shaping are carried out, and the obtained product is irregular in shape.
Current cut-out press only processes to single hole, be CN106216493A like patent publication, a disclosed cut-out press's improvement structure suitable for microperforated panel silencer, including die holder, upper die base and membrane handle, the drift fixed plate is installed to the upper die base bottom, and the drift fixed plate bottom sets up the drift, and the die holder top is fixed with the guide bar, the blowing board, the activity of guide bar upper end runs through the upper die base, sets up on the blowing board and punches a hole, punches a hole and runs through blowing board and die holder, and this kind of device only is applicable to the processing in single hole. In order to provide more than two holes on the automobile muffler, one hole is punched through a punching die, other holes need to be punched on raw materials of the inner shell and the outer shell respectively, and then the inner shell and the outer shell are subjected to die-casting forming and then are locked, so that the holes of the inner shell are aligned with the holes of the outer shell.
The above related technical solutions have the following drawbacks: because the size of the die-casting forming of the inner shell and the outer shell is different, the hole dislocation of the inner shell and the outer shell is easy to occur after the lock seam, and the finished product rate of the produced product is further influenced.
SUMMERY OF THE UTILITY MODEL
The application aims at providing a multihole punching die of an automobile muffler, which has the advantage of improving the yield of products.
The above object of the present application is achieved by the following technical solutions:
a punching die for multiple holes of an automobile muffler comprises a static die and a movable die, wherein a driving mechanism for driving the movable die to be close to and far away from the static die is arranged on the static die, and a first punch for punching a product is arranged on one side, facing the static die, of the movable die; a guide rail is arranged on one side, facing the movable die, of the static die, the guide rail is connected with an installation seat in a sliding mode, and a second punch used for punching a product is arranged on the installation seat; the movable mould is provided with a linkage assembly, and the linkage assembly is used for converting an acting force for driving the movable mould to be close to and far away from the static mould into an acting force for driving the mounting seat to reciprocate on the guide rail.
By adopting the technical scheme, the driving mechanism drives the movable die to be close to the static die, the first punch head is close to the static die along with the movable die, and a product placed on the static die is punched; meanwhile, the linkage assembly converts the acting force of the movable die close to the static die into the acting force of the mounting seat moving towards the product on the guide rail, and the second punch head is close to the product along with the mounting seat so as to punch the product; conversely, as the moving die moves away from the stationary die, the first and second punches will move away from the product placed on the stationary die. The positions and the angles of the two punching holes on the product are changed, and the product can be adjusted by changing the positions of the guide rails and the inclination angles of the guide rails. Therefore, the multi-hole punching efficiency of the product can be accelerated, and the production cost is reduced; and the double-layer shell of the product is punched simultaneously, so that the condition that the holes of the inner and outer shells are staggered can be reduced, and the yield of the product is improved.
The application is further configured to: the linkage assembly comprises a sliding groove and a sliding rod, the sliding groove is formed in the mounting seat, the sliding rod is fixed on one side, facing the static die, of the movable die, and the sliding rod is in sliding fit with the sliding groove; an included angle is formed between the extending direction of the sliding rod and the moving direction of the movable die, and the sliding rod inclines towards the direction of the installation seat far away from the product.
By adopting the technical scheme, the sliding rod is matched with the sliding groove, and the movable die moves towards the direction of the static die, so that the mounting seat is close to the movable die along the sliding rod; the sliding rod inclines towards the direction of the mounting seat far away from the product, so that the mounting seat is close to the product along the guide rail, and the product is punched through the second punch on the mounting seat; conversely, as the movable mould is far away from the static mould, the installation seat is far away from the product along the guide rail, and the linkage assembly structure is more stable.
The application is further configured to: the linkage assembly comprises a linkage rod, two ends of the linkage rod are respectively connected to the movable die and the mounting seat in a rotating mode, and the linkage rod and the rotating shaft of the movable die are located on the outer side, away from the product, of the linkage rod and the rotating shaft of the mounting seat.
By adopting the technical scheme, the movable die moves towards the direction of the static die, the movable die pushes the mounting seat to be close to a product along the guide rail through the linkage rod, and thus the product is punched through the second punch on the mounting seat; on the contrary, as the movable mould is far away from the static mould, the movable mould pulls the mounting seat to be far away from the product along the guide rail through the linkage rod, and the linkage assembly is simpler in structure.
The application is further configured to: the positioning assembly is arranged on the static die and used for positioning a product, the positioning assembly comprises a support and a positioning seat, the support is fixed on the static die, one end of the positioning seat is fixed on the support, and the positioning seat is located between the static die and the movable die and used for placing the product.
By adopting the technical scheme, the product is taken and placed from one end of the positioning seat far away from the support, so that the product is more easily sleeved on the positioning seat; the positioning seat is used for positioning the product, so that the situation that the product moves is reduced when the first punch and the second punch the product, and the punching position on the product is more accurate.
The application is further configured to: the fixed die is connected with a support block in a sliding manner, and the support block is used for supporting one end of the positioning seat far away from the support; and the static die is provided with a power cylinder for driving the supporting block to slide.
By adopting the technical scheme, when the punching die punches a hole, the supporting block and the support seat respectively support the positioning seat, so that a product is positioned on the positioning seat more stably; the supporting block is driven by the power cylinder to be separated from the positioning seat, so that the product can be taken out from the positioning seat more easily.
The application is further configured to: the surface of the positioning seat facing the static die is rotatably connected with a supporting wheel, and the supporting wheel can be in rolling fit with the surface of the supporting block departing from the static die.
Through adopting above-mentioned technical scheme, power cylinder orders about the supporting shoe and removes on quiet mould, and the roll of supporting wheel will make the supporting shoe remove the below of positioning seat more easily to support the positioning seat.
The application is further configured to: a first female die is arranged on the positioning seat and corresponds to the first punch; and a second female die is arranged on the positioning seat and corresponds to the second punch.
Through adopting above-mentioned technical scheme, first drift cooperatees with first die to and second drift cooperatees with the second die, will make punching a hole of product easier, and can reduce the condition that first drift and second drift damaged.
The application is further configured to: the movable die is provided with a limiting female die used for being sleeved outside a product, and the limiting female die is provided with a through hole for the first punch to penetrate through.
By adopting the technical scheme, when the punching die punches the holes, the limiting female die and the positioning seat position the products together, so that the situation that the products move is further reduced; when the punching die does not punch, the limiting concave die can protect the first punch, so that the condition that the first punch is damaged is reduced.
The application is further configured to: and a sheath which is sleeved outside the second punch is arranged on the mounting seat.
Through adopting above-mentioned technical scheme, when the cut-out press did not punch a hole, the sheath can be to the protection of second drift to reduce the condition that the second drift appears damaging.
The application is further configured to: the driving mechanism comprises a guide pillar, a guide sleeve and a driving cylinder, wherein one end of the guide sleeve is fixed on the static die, one end of the guide pillar is fixed on the movable die, and the other end of the guide pillar is connected in the guide sleeve in a sliding manner; the cylinder body of the driving cylinder is fixed on the static die, and the piston rod of the driving cylinder is fixed on the movable die.
By adopting the technical scheme, the guide pillar is matched with the guide sleeve, so that the guide effect of guiding the movable mould and the static mould to approach or move away can be achieved; the movable mould and the static mould are driven to be close to or far away through the driving cylinder, and the structure is simple.
To sum up, the beneficial technical effect of this application does:
1. the first punch head approaches to the static die along with the movable die and punches a product placed on the static die; meanwhile, the linkage assembly converts the acting force of the movable die close to the static die into the acting force of the mounting seat moving towards the product on the guide rail, and the second punch head is close to the product along with the mounting seat so as to punch the product; conversely, as the moving die moves away from the stationary die, the first and second punches will move away from the product placed on the stationary die. The multi-hole punching efficiency of the product can be accelerated, and the production cost is reduced; the double-layer shell of the product is punched simultaneously, so that the situation that the holes of the inner shell and the outer shell are staggered can be reduced, and the yield of the product is improved;
2. because the sliding rod is matched with the sliding groove, the movable die moves towards the direction of the static die, and the mounting seat is enabled to be close to the movable die along the sliding rod; because the direction slope of product is kept away from towards the mount pad to the slide bar, will make the mount pad be close to the product along the guided way to second drift on the mount pad punches a hole to the product, the structure of linkage subassembly is more firm like this.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present application;
FIG. 2 is a schematic structural diagram of a limiting concave die according to one embodiment of the present application after being partially sectioned;
FIG. 3 is an enlarged partial schematic view of portion A of FIG. 2;
fig. 4 is a schematic structural diagram of another embodiment of the present application.
In the figure, 1, a static mode; 2. moving the mold; 31. a guide post; 32. a guide sleeve; 33. a driving cylinder; 4. a first punch; 5. a guide rail; 6. a mounting seat; 7. a second punch; 81. a sliding groove; 82. a slide bar; 83. a linkage rod; 91. a support; 92. positioning seats; 10. a support block; 11. a power cylinder; 12. a support wheel; 13. a first female die; 14. a second female die; 15. a limiting female die; 16. a through hole; 17. a sheath; 18. a slide rail; 19. a slider; 20. a first fixed seat; 21. a motor; 22. a limiting block; 23. a second fixed seat; 24. and a third fixed seat.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
The embodiment of the application discloses porous cut-out press of car silencer.
Example 1
Referring to fig. 1, a porous cut-out press of car silencer, includes static mould 1 and movable mould 2, installs actuating mechanism on the static mould 1, and actuating mechanism includes guide pillar 31, guide pin bushing 32 and drives actuating cylinder 33, and bolted connection is passed through on the static mould 1 to the one end of guide pin bushing 32, and bolted connection is passed through on the movable mould 2 to the one end of guide pillar 31, and the other end of guide pillar 31 slides and connects in guide pin bushing 32. The guide pillar 31 is matched with the guide sleeve 32, so that the movable die 2 and the fixed die 1 can be guided to approach or separate from each other. Four driving cylinders 33 are provided, and the four driving cylinders 33 are respectively positioned at four corners of the movable mold 2; the cylinder body of the driving cylinder 33 is fixed on the static mould 1, the piston rod of the driving cylinder 33 is fixed on the movable mould 2, and the movable mould 2 can be driven to be close to or far away from the static mould 1 by the driving cylinder 33.
Install locating component on quiet mould 1, locating component includes support 91 and positioning seat 92, and support 91 welds on quiet mould 1, and the one end welding of positioning seat 92 is on support 91, and positioning seat 92 is located between quiet mould 1 and movable mould 2 for supply the product to lay. Because the automobile muffler is the tube-shape, the product is got from the one end that positioning seat 92 kept away from support 91 and is put for it is easier that the product cup joints on positioning seat 92. Fix a position the product through positioning seat 92, when the cut-out press of being convenient for punched a hole to the product, the condition that the removal appears in the reduction product to the position of punching a hole on messenger's product is more accurate.
The first fixing seat 20 is welded on the stationary mold 1, and the first fixing seat 20 and the support 91 are respectively located at two ends of the positioning seat 92. The first fixing seat 20 is welded with a slide rail 18, and the extending direction of the slide rail 18 is perpendicular to the extending direction of the positioning seat 92; the slide rail 18 is provided with a supporting block 10, the supporting block 10 is integrally formed with a slide block 19, and the slide block 19 is in sliding fit with the slide rail 18. The supporting block 10 can move on the first fixed seat 20 along the slide rail 18 through the cooperation of the slide block 19 and the slide rail 18. The surface of the positioning seat 92 facing the static mold 1 is rotatably connected with three supporting wheels 12, and the supporting wheels 12 can be in rolling fit with the surface of the supporting block 10 facing away from the static mold 1. The rolling of the support wheels 12 will make it easier for the support block 10 to move under the positioning socket 92 and thus support the positioning socket 92.
The bolt connection has power cylinder 11 on the first fixing base 20, drives supporting shoe 10 through power cylinder 11 and slides. When the punching die punches a hole, the supporting block 10 and the support 91 respectively support the positioning seat 92, so that a product is positioned on the positioning seat 92 more stably; the supporting block 10 is driven by the power cylinder 11 to be separated from the positioning seat 92, so that the product can be taken out from the positioning seat 92 more easily.
Referring to fig. 1 and 2, one end of the positioning seat 92, which is far away from the support 91, is connected with the motor 21 through a bolt, the output shaft of the motor 21 is fixed with a limiting block 22, and the limiting block 22 is L-shaped. When the product cover is outside the reference column, through control motor 21 circular telegram for stopper 22 is rotatory in order to restrict the product, combines positioning seat 92 and support 91 to the restriction of product, can all restrict the upper and lower, about and around the product, thereby makes the location of product more accurate.
Referring to fig. 2 and 3, a first punch 4 is fixed on one side of the movable mold 2 facing the stationary mold 1, a first groove is formed in the positioning seat 92, and the first female mold 13 corresponds to the first punch 4. By the cooperation of the first punch 4 and the first die 13, punching of the product is easier, and damage to the first punch 4 can be reduced. The movable die 2 is connected with a limiting female die 15 through a bolt, and the limiting female die 15 is located between the movable die 2 and the positioning seat 92 and is used for being sleeved outside a product; the limiting concave die 15 is provided with a through hole 16 for the first punch 4 to pass through. When the punching die punches a hole, the limiting concave die 15 and the positioning seat 92 position the product together, so that the situation that the product moves is further reduced; when the punching die does not punch, the limiting concave die 15 can protect the first punch 4, so that the condition that the first punch 4 is damaged is reduced.
A second fixed seat 23 is welded on one side, facing the movable mold 2, of the static mold 1, a guide rail 5 is installed on the second fixed seat 23, the guide rail 5 is connected with an installation seat 6 in a sliding mode, and a second punch 7 is fixed on the installation seat 6; the positioning seat 92 is provided with a second concave die 14, and the second concave die 14 corresponds to the second punch 7. The second punch 7 is matched with the second concave die 14, so that the punching of the product is easier, and the damage of the second punch 7 can be reduced. The mounting seat 6 is connected with a sheath 17 through bolts, and the sheath 17 is sleeved outside the second punch 7. The sheath 17 can protect the second punch 7 when the punching die is not punching, thereby reducing the occurrence of damage to the second punch 7.
And a linkage assembly is arranged on the third fixed seat 24 and is used for converting the acting force for driving the movable mold 2 to approach and leave the stationary mold 1 into the acting force for driving the mounting seat 6 to reciprocate on the guide rail 5. The linkage assembly comprises a sliding groove 81 and a sliding rod 82, the sliding groove 81 is formed in the mounting seat 6, the sliding rod 82 is welded on the third fixing seat 24, and the sliding rod 82 is in sliding fit with the sliding groove 81; an included angle is formed between the extending direction of the sliding rod 82 and the moving direction of the movable die 2, and the sliding rod 82 inclines towards the direction of the mounting seat 6 far away from the product. When the positions and the angles of the two punched holes on the product are changed, the positions and the angles of the guide rails 5 can be adjusted by changing the positions of the guide rails 5 and the inclination angles of the guide rails 5.
The implementation principle of the embodiment 1 is as follows: the driving cylinder 33 drives the movable mold 2 to approach the stationary mold 1, the first punch 4 approaches the stationary mold 1 along with the movable mold 2, and punches the product positioned on the positioning seat 92; meanwhile, as the sliding rod 82 is matched with the sliding groove 81, the mounting seat 6 is close to the third fixing seat 24 along the sliding rod 82; as the sliding rod 82 is inclined towards the direction of the mounting seat 6 far away from the product, the mounting seat 6 is close to the product along the guide rail 5, so that the product is punched through the second punch 7 on the mounting seat 6; conversely, the driving cylinder 33 drives the movable die 2 away from the stationary die 1, and the first punch 4 and the second punch 7 will be away from the product positioned on the positioning seat 92. Therefore, the multi-hole punching efficiency of the product can be accelerated, and the production cost is reduced; and the double-layer shell of the product is punched simultaneously, so that the condition that the holes of the inner and outer shells are staggered can be reduced, and the yield of the product is improved.
Example 2
Referring to fig. 4, the difference between this embodiment and embodiment 1 is that the linkage assembly includes a linkage rod 83, two ends of the linkage rod 83 are respectively rotatably connected to the third fixing seat 24 and the mounting seat 6, and the rotation axes of the linkage rod 83 and the third fixing seat 24 are located at the outer side of the rotation axes of the linkage rod 83 and the mounting seat 6, which is far away from the product.
The implementation principle of the embodiment 2 is as follows: the movable die 2 moves towards the direction of the static die 1, the movable die 2 pushes the installation seat 6 to be close to a product along the guide rail 5 through the linkage rod 83, and therefore the product is punched through the second punch 7 on the installation seat 6; on the contrary, as the movable mold 2 is far away from the stationary mold 1, the movable mold 2 pulls the mounting seat 6 away from the product along the guide rail 5 through the linkage rod 83, and the linkage assembly is simpler in structure.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a porous cut-out press of car silencer, includes quiet mould (1) and movable mould (2), its characterized in that: the static die (1) is provided with a driving mechanism for driving the movable die (2) to be close to and far away from the static die (1), and one side, facing the static die (1), of the movable die (2) is provided with a first punch (4) for punching a product; a guide rail (5) is arranged on one side, facing the movable die (2), of the static die (1), a mounting seat (6) is connected to the guide rail (5) in a sliding mode, and a second punch (7) used for punching a product is arranged on the mounting seat (6); the movable mould (2) is provided with a linkage assembly, and the linkage assembly is used for converting an acting force for driving the movable mould (2) to be close to and far away from the static mould (1) into an acting force for driving the mounting seat (6) to reciprocate on the guide rail (5).
2. The multi-hole punching die for the automobile muffler, according to claim 1, is characterized in that: the linkage assembly comprises a sliding groove (81) and a sliding rod (82), the sliding groove (81) is formed in the mounting seat (6), the sliding rod (82) is fixed on one side, facing the static die (1), of the movable die (2), and the sliding rod (82) is in sliding fit with the sliding groove (81); an included angle is formed between the extending direction of the sliding rod (82) and the moving direction of the moving die (2), and the sliding rod (82) inclines towards the direction of the installation seat (6) far away from a product.
3. The multi-hole punching die for the automobile muffler, according to claim 1, is characterized in that: the linkage assembly comprises a linkage rod (83), two ends of the linkage rod (83) are respectively connected to the movable die (2) and the mounting seat (6) in a rotating mode, and the linkage rod (83) and the rotating shaft of the movable die (2) are located on the outer side, away from the product, of the linkage rod (83) and the rotating shaft of the mounting seat (6).
4. The multi-hole punching die for the automobile muffler, according to claim 1, is characterized in that: the positioning device is characterized in that a positioning assembly used for positioning a product is arranged on the static die (1), the positioning assembly comprises a support (91) and a positioning seat (92), the support (91) is fixed on the static die (1), one end of the positioning seat (92) is fixed on the support (91), and the positioning seat (92) is located between the static die (1) and the movable die (2) and used for placing the product.
5. The multi-hole punching die for the automobile muffler, according to claim 4, is characterized in that: the fixed die (1) is connected with a supporting block (10) in a sliding mode, and the supporting block (10) is used for supporting one end, far away from the support (91), of the positioning seat (92); and the static die (1) is provided with a power cylinder (11) for driving the supporting block (10) to slide.
6. The multi-hole punching die for the automobile muffler, according to claim 5, is characterized in that: the surface of the positioning seat (92) facing the static mold (1) is rotatably connected with a supporting wheel (12), and the supporting wheel (12) can be in rolling fit with the surface of the supporting block (10) deviating from the static mold (1).
7. The multi-hole punching die for the automobile muffler, according to claim 4, is characterized in that: a first female die (13) is arranged on the positioning seat (92), and the first female die (13) corresponds to the first punch (4); and a second female die (14) is arranged on the positioning seat (92), and the second female die (14) corresponds to the second punch (7).
8. The multi-hole punching die for the automobile muffler according to any one of claims 1 to 4, wherein: the movable die (2) is provided with a limiting female die (15) used for being sleeved outside a product, and the limiting female die (15) is provided with a through hole (16) for the first punch (4) to penetrate through.
9. The multi-hole punching die for the automobile muffler according to any one of claims 1 to 4, wherein: and a sheath (17) which is sleeved outside the second punch (7) is arranged on the mounting seat (6).
10. The multi-hole punching die for the automobile muffler, according to claim 1, is characterized in that: the driving mechanism comprises a guide post (31), a guide sleeve (32) and a driving cylinder (33), one end of the guide sleeve (32) is fixed on the static die (1), one end of the guide post (31) is fixed on the movable die (2), and the other end of the guide post (31) is connected in the guide sleeve (32) in a sliding manner; the cylinder body of the driving cylinder (33) is fixed on the static die (1), and the piston rod of the driving cylinder (33) is fixed on the movable die (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023042438.6U CN213997423U (en) | 2020-12-16 | 2020-12-16 | Multi-hole punching die for automobile silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023042438.6U CN213997423U (en) | 2020-12-16 | 2020-12-16 | Multi-hole punching die for automobile silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213997423U true CN213997423U (en) | 2021-08-20 |
Family
ID=77312362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023042438.6U Expired - Fee Related CN213997423U (en) | 2020-12-16 | 2020-12-16 | Multi-hole punching die for automobile silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213997423U (en) |
-
2020
- 2020-12-16 CN CN202023042438.6U patent/CN213997423U/en not_active Expired - Fee Related
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Granted publication date: 20210820 |