CN215033105U - Prevention mechanism based on scrap jumping of punching die knife edge - Google Patents
Prevention mechanism based on scrap jumping of punching die knife edge Download PDFInfo
- Publication number
- CN215033105U CN215033105U CN202120919010.0U CN202120919010U CN215033105U CN 215033105 U CN215033105 U CN 215033105U CN 202120919010 U CN202120919010 U CN 202120919010U CN 215033105 U CN215033105 U CN 215033105U
- Authority
- CN
- China
- Prior art keywords
- air inlet
- blanking
- hole
- air
- trigger
- 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.)
- Active
Links
Images
Landscapes
- Punching Or Piercing (AREA)
Abstract
The utility model provides a prevention mechanism based on punching die edge of a knife is jumped bits, include: the lower template is provided with blanking holes; the gas control mechanism is arranged in the lower template; wherein, when the punch head falls to a bottom dead center along the blanking hole; the gas control mechanism forms a negative pressure below the head of the punch and a positive pressure above the punch. The utility model discloses a gaseous control mechanism takes the waste material to move when the bottom dead center at the drift, forms malleation and negative pressure on the upper and lower both ends face of waste material respectively, and then when making the drift roll back, the negative pressure that the waste material below formed adsorbs the waste material, and the malleation of waste material top is applyed decurrent pressure and gaseous space between filling drift and waste material fast to the waste material, great reduction jump the probability of bits, and then reduce the mould and damage the probability, practice thrift the cost.
Description
Technical Field
The utility model relates to a press die technical field especially relates to a prevention mechanism based on press die edge of a knife jumps bits.
Background
The stamping die is a special process equipment for processing materials (metal or nonmetal) into parts (or semi-finished products) in cold stamping processing, and is called a cold stamping die (commonly called a cold stamping die). Stamping is a press working method in which a die mounted on a press is used to apply pressure to a material at room temperature to cause separation or plastic deformation of the material, thereby obtaining a desired part.
In the stamping production process, the situation that the scrap is jumped due to the small holes of the die is often met. The small hole is jumped the bits and is caused the product easily and press and hinder and then reduce the yields, serious can lead to damaging the mould. The reason for the scrap jumping is that when the punch returns back from the female die, air backflow between the punch and the waste material cannot generate approximate vacuum in time, the waste material is subjected to the pressure difference between the atmospheric pressure below the waste material and the vacuum above the waste material, and rises together with the punch, so that the waste material returns to the female die and continues to participate in the subsequent punching process, and the die is damaged.
The prior art mostly adopts the situation that negative pressure is generated under the waste to reduce the occurrence of chip jumping. However, shavings are still occasionally generated.
SUMMERY OF THE UTILITY MODEL
To exist not enough among the prior art, the utility model provides a prevent mechanism based on punching die edge of a knife jumps bits to reduce cost improves the effect of blowing, reduces and jumps bits and takes place the probability.
The utility model provides a prevention mechanism based on punching die edge of a knife is jumped bits, include:
the lower template is provided with blanking holes;
the gas control mechanism is arranged in the lower template;
wherein, when the punch head falls to a bottom dead center along the blanking hole; the gas control mechanism forms a negative pressure below the head of the punch and a positive pressure above the punch.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses in the technique, when taking the waste material to move bottom dead center at the drift through gaseous control mechanism, form malleation and negative pressure on the upper and lower both ends face of waste material respectively, and then when making the drift roll back, the negative pressure that the waste material below formed adsorbs the waste material, and the malleation of waste material top is applyed decurrent pressure and gaseous space between filling drift and waste material fast to the waste material, great reduction the probability of jumping bits, and then reduce the mould and damage probability, practice thrift the cost.
Preferably, the gas control mechanism comprises an air channel structure;
the air passage structure comprises an air inlet channel which is arranged on the lower template and is communicated with the outside, and a first air blowing passage and a second air blowing passage which are communicated with the air inlet channel;
one end of the first air blowing passage, which is far away from the air inlet passage, and one end of the second air blowing passage, which is far away from the air inlet passage, are both communicated with the blanking hole and are sequentially arranged along the blanking direction of the blanking hole; and the blowing direction of the second air blowing channel is obliquely arranged along the blanking direction of the blanking hole.
Preferably, the blowing direction of the first blowing duct is obliquely arranged along the blanking direction of the blanking hole.
Preferably, the gas control mechanism further comprises a gas stopping member and a triggering member which are installed in the lower template;
the gas stopping component comprises a gas stopping ball, a limiting ring and a sliding pipe;
the outer ring of the limiting ring is fixedly connected with the inner wall of the air inlet channel; the stop balloon and the sliding pipe are positioned on two sides of the limiting ring and are in sliding fit with the air inlet channel; the sliding pipe and the first air blowing channel are positioned on the same side of the limiting ring; the balloon stopping body is connected with a connecting rod; the connecting rod penetrates through the limiting ring and is connected with a cross rod; two ends of the cross rod are respectively connected with the inner wall of the sliding pipe; the sliding tube is connected with the trigger component;
when the punch is contacted with the triggering component during blanking, the triggering component drives the sliding pipe to slide along the air inlet channel.
Preferably, the gas control mechanism further comprises a placement groove formed in the inner wall of the blanking hole; the side wall of the placing groove is provided with a linkage through hole; the other end of the linkage through hole is communicated with the air inlet channel;
the air inlet channel is positioned between the placing groove and the blanking end of the blanking hole;
the trigger component comprises a trigger block, a rotating rod, a sleeve, an external connecting rod and a positioning rod;
the upper end of the trigger block is provided with a trigger through hole; the outer wall of the rotating rod is in clearance fit with the inner wall of the trigger through hole; two ends of the rotating rod are respectively connected with the inner wall of the placing groove; the positioning rod is fixedly connected with the bottom of the placement groove; the sleeve is sleeved on the positioning rod in a sliding manner; one end of the sleeve, which is far away from the placing groove, is contacted with the lower end of the trigger block; the outer wall of the sleeve is connected with one end of the extension rod, and one end of the extension rod, which is far away from the sleeve, penetrates through the linkage through hole and then is connected with the outer wall of the sliding pipe; when the sleeve slides along the positioning rod, the extension rod moves along the radial direction of the linkage through hole.
Preferably, the outer walls of the two ends of the sliding pipe are respectively provided with an annular groove along the circumferential direction of the sliding pipe; rubber rings are arranged in the annular grooves; the outer wall of the rubber ring is in contact with the inner wall of the air inlet channel.
Preferably, the trigger member further comprises a trigger spring;
the trigger spring is sleeved on the positioning rod, and two ends of the trigger spring are respectively abutted against the bottom of the placement groove and the end part of the sleeve.
Preferably, the gas control mechanism is provided with a plurality of sets around the circumference of the blanking hole;
one of a plurality of air inlet channels in the plurality of sets of air control mechanisms is communicated with the outside, and one ends of the rest air inlet channels, which are far away from the blanking hole, are closed; the air inlet channels of the plurality of sets of air control mechanisms are communicated by a connecting channel arranged in the lower template.
Drawings
Fig. 1 is a schematic structural diagram of a prevention mechanism based on scrap jumping at a knife edge of a stamping die in an embodiment of the present invention;
fig. 2 is an enlarged schematic view of a gas stopping member and a trigger member of the press die edge chip-jumping prevention mechanism in fig. 1.
The reference numbers illustrate:
1. a lower template; 11. a blanking hole;
2. a gas control mechanism;
21. an airway structure; 211. an air inlet channel; 212. a first air blowing passage; 213. a second air blowing duct;
22. a gas-stopping member; 221. stopping the balloon; 222. a limiting ring; 223. a sliding tube; 224. a connecting rod; 225. a cross bar; 226. a rubber ring;
23. a trigger member; 231. a trigger block; 231a, a trigger through hole; 232. rotating the rod; 233. a sleeve; 234. an extension rod; 235. positioning a rod; 236. a trigger spring;
24. a placing groove; 241. the linkage through-hole.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly understood, the following technical solutions of the present invention are further described with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 2, a mechanism for preventing chip jumping based on a punching die cutting edge comprises: the lower template 1 is provided with a blanking hole 11. And the gas control mechanism 2 is arranged in the lower template 1.
Wherein, when the punch falls to the bottom dead center along the blanking hole 11; the gas control mechanism 2 forms a negative pressure below the head of the punch and a positive pressure above the punch.
The negative pressure may be formed by blowing air in the blanking direction of the blanking hole 11 or by sucking air in the opposite direction to the blanking direction of the blanking hole 11. When the punch punches along the blanking hole 11, the waste material falls along the blanking hole 11 until the punch moves to a bottom dead center, and reverse backspacing is carried out; at the moment, air between the punch and the blanking falling waste materials cannot be filled in time to form negative pressure, the faster the punch returns, the larger the negative pressure, and the blanking falling waste materials are adsorbed and return along the blanking hole 11; at the moment, the gas control mechanism 2 forms positive pressure above the waste, gas is quickly filled in a gap between the waste and the punch to relieve the negative pressure state between the waste and the punch, the gas control mechanism 2 forms negative pressure below the waste to adsorb the waste, the waste slides down along the blanking hole 11 under the double action, and the probability of scrap jumping of the waste is greatly reduced.
Specifically, the gas control mechanism 2 includes a gas passage structure 21. The air passage structure 21 includes an air inlet passage 211 opened on the lower die plate 1 to communicate with the outside, and a first air blow passage 212 and a second air blow passage 213 communicating with the air inlet passage 211.
One end of the first air blowing passage 212, which is far away from the air inlet passage 211, and one end of the second air blowing passage 213, which is far away from the air inlet passage 211, are both communicated with the blanking hole 11 and are sequentially arranged along the blanking direction of the blanking hole 11; the blowing direction of the second blowing duct 213 is obliquely arranged along the blanking direction of the blanking hole 11.
The air inlet 211 is externally connected with an air inlet device for blowing air into the air inlet 211. The bottom dead center is provided between the first blow-gas duct 212 and the second blow-gas duct 213. When the punch drives the waste to move to the bottom dead center, the gas of the gas inlet device is blown out along the first gas blowing channel 212 and the second gas blowing channel 213, and the waste passes through the mouth of the first gas blowing channel 212 and then passes through the mouth of the second gas blowing channel 213 because the second gas blowing channel 213 is located below the first gas blowing channel 212, namely, along the direction of waste blanking. When the second air blowing duct 213 blows air, the air is blown obliquely downward in the blanking hole 11, and negative pressure is formed below the waste. The first air blowing channel 212 blows air above the waste, the stamping die at the moment is tightly attached, the air of the first air blowing channel 212 is densely distributed above the waste, and when the punch is withdrawn, the air is filled into a gap between the punch and the waste, so that the negative pressure state between the punch and the waste is relieved.
Also, the blowing direction of the first blowing duct 212 is arranged obliquely along the blanking direction of the blanking hole 11.
When the waste moves between the first air blowing channel 212 and the second air blowing channel 213, the first air blowing channel 212 is obliquely arranged, the space between the punch at the upper part of the waste and the blanking hole 11 can be filled with the air during air blowing, the upper end surface of the waste can be blown to apply pressure, and the probability of scrap jumping of the waste is reduced.
In detail, the gas control mechanism 2 further comprises a gas stop member 22 and a trigger member 23 installed in the lower template 1. The gas stop member 22 includes a gas stop balloon 221, a stop collar 222, and a sliding tube 223.
The outer ring of the limiting ring 222 is fixedly connected with the inner wall of the air inlet 211; the air stopping ball 221 and the sliding pipe 223 are positioned at two sides of the limiting ring 222 and are in sliding fit with the air inlet 211; the sliding tube 223 and the first air blowing duct 212 are located on the same side of the retainer ring 222; the connecting rod 224 is connected to the air stopping ball 221; the connecting rod 224 is connected with a cross rod 225 after passing through the limiting ring 222; both ends of the cross bar 225 are connected with the inner wall of the sliding tube 223 respectively; the sliding tube 223 is connected with the trigger member 23;
after the punch contacts the trigger member 23 during punching, the trigger member 23 drives the sliding tube 223 to slide along the air inlet channel 211.
The sliding tube 223 is driven by the trigger component 23 to slide along the axial direction of the air inlet 211, and the air stopping ball 221 is far away from the limiting ring 222, so that the air in the air inlet 211 can pass through the limiting ring 222 and then ventilate the first air blowing channel 212 and the second air blowing channel 213. When the punch is far away from the blanking hole 11, the triggering member 23 can not drive the stop ball 221 any more, and at this time, the stop ball 221 slides to be close to the limit ring 222 under the action of the air pressure in the air inlet 211, so that the air inlet 211 is stopped.
In addition, the gas control mechanism 2 also comprises a placing groove 24 arranged on the inner wall of the blanking hole 11; a linkage through hole 241 is formed on the side wall of the placing groove 24; the other end of the linkage through hole 241 communicates with the intake passage 211. The inlet passage 211 is located between the seating groove 24 and the blanking end of the blanking hole 11. The trigger member 23 includes a trigger block 231, a rotation lever 232, a sleeve 233, an external lever 234, and a positioning lever 235.
The upper end of the trigger block 231 is provided with a trigger through hole 231 a; the outer wall of the rotating rod 232 is in clearance fit with the inner wall of the trigger through hole 231 a; two ends of the rotating rod 232 are respectively connected with the inner wall of the placing groove 24; the positioning rod 235 is fixedly connected with the bottom of the placing groove 24; the sleeve 233 is sleeved on the positioning rod 235 in a sliding manner; one end of the sleeve 233 far away from the placing groove 24 is in contact with the lower end of the trigger block 231; the outer wall of the sleeve 233 is connected with one end of the external connecting rod 234, and one end of the external connecting rod 234 far away from the sleeve 233 penetrates through the linkage through hole 241 and then is connected with the outer wall of the sliding tube 223; when the sleeve 233 slides along the positioning rod 235, the outer connecting rod 234 moves in the radial direction of the link through-hole 241.
The punch drives the waste material to pass through the trigger block 231 during blanking, and the trigger block 231 is driven to rotate so as to press the sleeve 233 to be close to the bottom of the placing groove 24 along the positioning rod 235. The extension rod 234 drives the sliding tube 223 to move so that the stop balloon 221 is far away from the stop collar 222, and the air inlet 211 is opened. When the punch retracts, under the action of air pressure of the air inlet channel 211, the air stopping ball 221 sequentially drives the sliding pipe 223, the external connecting rod 234 and the sleeve 233 to slide until the external connecting rod 234 abuts against the inner wall of the linkage through hole 241, at the moment, the lower end of the trigger block 231 rotates into the blanking hole 11, the punch retraction is not affected, waste materials are driven to move upwards to abut against the trigger block 231, and the probability of scrap jumping is reduced.
Moreover, the outer walls of the two ends of the sliding tube 223 are respectively provided with an annular groove along the circumferential direction; rubber rings 226 are arranged in the annular grooves; the outer wall of the rubber ring 226 contacts the inner wall of the intake passage 211.
When the air stop ball 221 is far away from the limit ring 222 to open the air inlet channel 211, the rubber ring 226 can prevent air from entering the installation groove 24, so that the air pressure in the air inlet channel 211 is reduced, and the air blowing effect of the first air blowing channel 212 and the second air blowing channel 213 is ensured.
Further, the trigger member 23 further includes a trigger spring 236.
The trigger spring 236 is sleeved on the positioning rod 235, and two ends of the trigger spring 236 respectively abut against the bottom of the placement groove 24 and the end of the casing 233.
When the punch is retracted, the trigger spring 236 forces the sleeve 233 to retract, based on the gas pressure in the inlet channel 211 to stop the gas flow, and the device is more stable.
Further, the gas control mechanism 2 is provided with a plurality of sets around the circumference of the blanking hole 11.
One of the air inlet channels 211 in the multiple sets of gas control mechanisms 2 is communicated with the outside, and one end of the other air inlet channels 211, which is far away from the blanking hole 11, is closed; the air inlet channels 211 of the plurality of sets of air control mechanisms 2 are communicated by a connecting channel arranged in the lower template.
The arrangement of the multiple sets of gas control mechanisms 2 can blow the upper end face and the lower end face of the waste in the blanking hole 11 from multiple directions, so that the effect is better.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (8)
1. The utility model provides a prevention mechanism based on punching press mould edge is jumped bits which characterized in that includes:
the lower template is provided with blanking holes;
the gas control mechanism is arranged in the lower template;
wherein, when the punch head falls to a bottom dead center along the blanking hole; the gas control mechanism forms a negative pressure below the head of the punch and a positive pressure above the punch.
2. The die-cutting chip-skipping-based prevention mechanism of claim 1, wherein the gas control mechanism comprises a gas channel structure;
the air passage structure comprises an air inlet channel which is arranged on the lower template and is communicated with the outside, and a first air blowing passage and a second air blowing passage which are communicated with the air inlet channel;
one end of the first air blowing passage, which is far away from the air inlet passage, and one end of the second air blowing passage, which is far away from the air inlet passage, are both communicated with the blanking hole and are sequentially arranged along the blanking direction of the blanking hole; and the blowing direction of the second air blowing channel is obliquely arranged along the blanking direction of the blanking hole.
3. The mechanism for preventing chip jumping on the basis of the cutting edge of the punching die as claimed in claim 2, wherein the blowing direction of the first blowing duct is obliquely arranged along the blanking direction of the blanking hole.
4. The mechanism for preventing the chip jumping based on the cutting edge of the stamping die as claimed in claim 2 or 3, wherein the gas control mechanism further comprises a gas stop member and a trigger member which are arranged in the lower template;
the gas stopping component comprises a gas stopping ball, a limiting ring and a sliding pipe;
the outer ring of the limiting ring is fixedly connected with the inner wall of the air inlet channel; the stop balloon and the sliding pipe are positioned on two sides of the limiting ring and are in sliding fit with the air inlet channel; the sliding pipe and the first air blowing channel are positioned on the same side of the limiting ring; the balloon stopping body is connected with a connecting rod; the connecting rod penetrates through the limiting ring and is connected with a cross rod; two ends of the cross rod are respectively connected with the inner wall of the sliding pipe; the sliding tube is connected with the trigger component;
when the punch is contacted with the triggering component during blanking, the triggering component drives the sliding pipe to slide along the air inlet channel.
5. The mechanism for preventing the chip jumping based on the cutting edge of the stamping die as claimed in claim 4, wherein the gas control mechanism further comprises a placement groove formed on the inner wall of the blanking hole; the side wall of the placing groove is provided with a linkage through hole; the other end of the linkage through hole is communicated with the air inlet channel;
the air inlet channel is positioned between the placing groove and the blanking end of the blanking hole;
the trigger component comprises a trigger block, a rotating rod, a sleeve, an external connecting rod and a positioning rod;
the upper end of the trigger block is provided with a trigger through hole; the outer wall of the rotating rod is in clearance fit with the inner wall of the trigger through hole; two ends of the rotating rod are respectively connected with the inner wall of the placing groove; the positioning rod is fixedly connected with the bottom of the placement groove; the sleeve is sleeved on the positioning rod in a sliding manner; one end of the sleeve, which is far away from the placing groove, is contacted with the lower end of the trigger block; the outer wall of the sleeve is connected with one end of the extension rod, and one end of the extension rod, which is far away from the sleeve, penetrates through the linkage through hole and then is connected with the outer wall of the sliding pipe; when the sleeve slides along the positioning rod, the extension rod moves along the radial direction of the linkage through hole.
6. The mechanism for preventing the chip jumping based on the punching die cutting edge as claimed in claim 5, wherein the outer walls of the two ends of the sliding tube are respectively provided with an annular groove along the circumferential direction; rubber rings are arranged in the annular grooves; the outer wall of the rubber ring is in contact with the inner wall of the air inlet channel.
7. The die-cutting chip-skipping-based prevention mechanism of claim 5, wherein the trigger member further comprises a trigger spring;
the trigger spring is sleeved on the positioning rod, and two ends of the trigger spring are respectively abutted against the bottom of the placement groove and the end part of the sleeve.
8. The punching die blade-chip-skipping-based prevention mechanism according to claim 7, wherein the gas control mechanism is provided with a plurality of sets around the circumference of the blanking hole;
one of a plurality of air inlet channels in the plurality of sets of air control mechanisms is communicated with the outside, and one ends of the rest air inlet channels, which are far away from the blanking hole, are closed; the air inlet channels of the plurality of sets of air control mechanisms are communicated by a connecting channel arranged in the lower template.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120919010.0U CN215033105U (en) | 2021-04-29 | 2021-04-29 | Prevention mechanism based on scrap jumping of punching die knife edge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120919010.0U CN215033105U (en) | 2021-04-29 | 2021-04-29 | Prevention mechanism based on scrap jumping of punching die knife edge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215033105U true CN215033105U (en) | 2021-12-07 |
Family
ID=79107780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120919010.0U Active CN215033105U (en) | 2021-04-29 | 2021-04-29 | Prevention mechanism based on scrap jumping of punching die knife edge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215033105U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116690194A (en) * | 2023-06-16 | 2023-09-05 | 滁州市远诚模具设备制造有限公司 | Numerical control stamping die capable of deburring and numerical control forming machine tool |
-
2021
- 2021-04-29 CN CN202120919010.0U patent/CN215033105U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116690194A (en) * | 2023-06-16 | 2023-09-05 | 滁州市远诚模具设备制造有限公司 | Numerical control stamping die capable of deburring and numerical control forming machine tool |
| CN116690194B (en) * | 2023-06-16 | 2024-03-12 | 江门市普瑞斯精密制造有限公司 | Numerical control stamping die capable of deburring and numerical control forming machine tool |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN215033105U (en) | Prevention mechanism based on scrap jumping of punching die knife edge | |
| CN109570361A (en) | It is a kind of can fast demoulding stamping die auxiliary device and its application method | |
| JPS60158930A (en) | Method and device for manufacturing shell | |
| CN113714394B (en) | Go up and go out waste material chain link joint blanking device | |
| CN104923655B (en) | Punching die | |
| CN204770135U (en) | Aluminum pipe frock of punching a hole | |
| CN110732618A (en) | Die for upsetting hexagon flange bolt | |
| CN108526345B (en) | Full-automatic stamping device for piston cylinder of air conditioner compressor of automobile and working method thereof | |
| CN102699218A (en) | Necking device of gas cylinder | |
| CN209035369U (en) | Bottom punch stick cooling device | |
| CN107097291A (en) | A kind of paper perforating mould piercing knife | |
| CN201320586Y (en) | Stamping piece ejection device for high-speed stamping die | |
| CN203712396U (en) | Knife replacing and air blowing mechanism of direct connection main shaft | |
| CN207171970U (en) | nut fetching device | |
| CN114589263B (en) | Automatic processing device for multi-station stamping hardware | |
| CN211727142U (en) | Die structure of stamping part | |
| CN203830533U (en) | Punching machine capable of manufacturing punched products continuously | |
| CN203245307U (en) | Riveting die of roller bearing E-shaped retainer | |
| CN216397815U (en) | High-efficient stamping die of sheet metal component easy demoulding | |
| CN109530553B (en) | Blanking and flanging integrated forming stamping die | |
| CN207288532U (en) | A kind of brake dust side-cutting die | |
| CN220674356U (en) | Perforating device is planted to yunnan paris polyphylla | |
| CN213436820U (en) | Punch die ejection device | |
| CN209990723U (en) | Miniature high-pressure oil hydraulic cylinder and forming die | |
| CN114101486B (en) | Stamping die for hardware stamping part |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |