CN113500132A - Method for balancing pressure center of iron core stamping die - Google Patents
Method for balancing pressure center of iron core stamping die Download PDFInfo
- Publication number
- CN113500132A CN113500132A CN202110756789.3A CN202110756789A CN113500132A CN 113500132 A CN113500132 A CN 113500132A CN 202110756789 A CN202110756789 A CN 202110756789A CN 113500132 A CN113500132 A CN 113500132A
- Authority
- CN
- China
- Prior art keywords
- die
- punch press
- center
- distance
- equal
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000005520 cutting process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 12
- 238000004590 computer program Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/04—Centering the work; Positioning the tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/14—Dies
- B21D28/145—Dies with means for slug retention, e.g. a groove
-
- 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
- B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a method for balancing the pressure center of an iron core stamping die, which has the technical scheme that: acquiring the moving distance of the die on the table surface of the punch; judging whether the movable distance is above or equal to a threshold value according to the obtained movable distance of the die on the table surface of the punch press; if the distance is above or equal to a threshold, executing a first strategy on the mold; if the distance is below the threshold value, a second strategy is executed on the die, after the die is balanced with the pressure center by the method, the damage to the cutting edge of the die and the stability of the die are obviously improved, meanwhile, the parallelism of the punch press slide block is protected to a certain degree, the stability of the die is improved, and meanwhile, three die adjusting modes are arranged, so that the die center aligning method disclosed by the invention has a wider application range.
Description
Technical Field
The invention relates to the technical field of dies, in particular to a method for balancing a pressure center of an iron core stamping die.
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 related art, a layout chart of a die is obtained on the premise of determining a blanking sequence of the die, and the position of a pressure center of the die can be obtained through calculation. Often the center of pressure is calculated not to coincide with the geometric center of the mold. Easily lead to the mould blade to damage, punch press slider stability descends to the life of mould reduces.
Disclosure of Invention
In view of the problems mentioned in the background art, an object of the present invention is to provide a method for balancing the pressure center of an iron core stamping die, so as to solve the problems mentioned in the background art.
The technical purpose of the invention is realized by the following technical scheme:
a method of balancing a core stamping die center of pressure, comprising: acquiring the moving distance of the die on the table surface of the punch;
judging whether the movable distance is above or equal to a threshold value according to the obtained movable distance of the die on the table surface of the punch press;
if the distance is above or equal to a threshold, executing a first strategy on the mold;
if the distance is below a threshold, a second policy is executed on the mold.
Through adopting above-mentioned technical scheme for behind the balanced pressure center of mould, the damage of mould blade has obvious improvement than before with mould stability, has also had certain degree of protection to the depth of parallelism of punch press slider simultaneously, improves mould stability.
Preferably, the judging whether the distance is above or equal to the threshold value according to the moving distance of the mold on the punch press table comprises: obtaining a difference value between the length of the table surface of the punch press and the length of the die, wherein the length is pointed to be the moving direction of the die;
and judging whether the distance is above or equal to a threshold value based on the difference between the length of the table surface of the punch press and the length of the die.
Preferably, the determining whether the distance is above or equal to a threshold value based on the difference between the length of the punch press table and the length of the die comprises: acquiring the length of the table top of the punch press and the absolute value corresponding to the difference value of the lengths of the dies;
detecting whether the absolute value is above or equal to a threshold;
if the absolute value is detected to be above or equal to the threshold value, determining that the moving distance of the die on the table surface of the punch press is above or equal to the threshold value;
and if the absolute value is detected to be below the threshold value, determining that the moving distance of the die on the table surface of the punch press is below the threshold value.
Preferably, the threshold is 110 mm.
Preferably, the first policy includes: the position of the die on the table surface of the punch press is changed to ensure that the pressure center of the die is consistent with the center of the slide block of the punch press.
Preferably, the changing the position of the mold on the punching table comprises one of: moving the position of the die on the table surface of the punch press to make the pressure center of the die consistent with the center of the slide block of the punch press;
the length of the die is changed to make the geometric center of the die consistent with the pressure center of the die.
Preferably, the second policy includes: judging whether the die can adjust the blanking sequence;
if the die can adjust the blanking sequence, executing a first sub-strategy;
if the die is not capable of adjusting the blanking order, a second sub-strategy is executed.
Preferably, the first sub-strategy comprises adjusting a blanking sequence of the die layout to achieve a die center of pressure that coincides with a punch press ram center.
Preferably, the second sub-strategy comprises adding pre-punched holes in the die to achieve a die center of pressure that coincides with the punch press ram center.
The three adjusting modes are set, so that the die center aligning method has more application range, has respective advantages and defects, and can be flexibly applied according to the characteristics of products in the actual die design application so as to achieve a reasonable design scheme.
In summary, the invention mainly has the following beneficial effects:
according to the method for balancing the pressure center of the iron core stamping die, provided by the embodiment of the invention, after the pressure center is balanced by the die, the damage to the cutting edge of the die and the stability of the die are obviously improved compared with the prior art, meanwhile, the parallelism of a punch press sliding block is also protected to a certain extent, the stability of the die is improved, the damage to the cutting edge of the die and the unilateral abrasion are reduced, and the service life of the punch press sliding block is prolonged. Meanwhile, the invention has three die adjustment modes, which have respective advantages and defects, and can be flexibly applied according to the characteristics of products in the actual die design application to achieve a more reasonable design scheme.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for balancing a pressure center of an iron core stamping die according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a first policy move according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a first sub-policy move according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a second sub-policy move according to an embodiment of the present invention;
FIG. 5 shows a lower table of a JL-80T type punching apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a method for balancing a pressure center of an iron core stamping die according to an embodiment of the present invention, and fig. 5 is a schematic table top diagram of a JL-80T type stamping device of the stamping device according to the present invention.
Referring to fig. 1-4, a method of balancing the center of pressure of an iron core stamping die includes:
step s100, adjusting the position of a die and placing the die on a stamping table;
step s101, adjusting the length direction of the die to enable the length direction of the die to be consistent with the movement direction of the stamping equipment;
step s102, acquiring a moving distance of the die on the table surface of the punch press;
step s104, judging whether the movable distance is above or equal to a threshold value according to the obtained movable distance of the die on the punch press table;
and step s106, if the distance is above or equal to the threshold, executing a first strategy on the mold.
And step s108, if the distance is below the threshold value, executing a second strategy on the mould.
After the pressure center of the die is balanced by the method, the damage to the cutting edge of the die and the stability of the die are obviously improved, and meanwhile, the parallelism of the sliding block of the punch press is protected to a certain extent, and the stability of the die is improved.
Further, the judging whether the distance is above or equal to the threshold value according to the moving distance of the die on the punch table comprises: obtaining a difference value between the length of the table surface of the punch press and the length of the die, wherein the length is pointed to be the moving direction of the die;
and judging whether the distance is above or equal to a threshold value based on the difference between the length of the table surface of the punch press and the length of the die.
Further, the determining whether the distance is above or equal to a threshold based on the difference in the length of the punch press land and the length of the die comprises: acquiring the length of the table top of the punch press and the absolute value corresponding to the difference value of the lengths of the dies;
detecting whether the absolute value is above or equal to a threshold;
if the absolute value is detected to be above or equal to the threshold value, determining that the moving distance of the die on the table surface of the punch press is above or equal to the threshold value;
and if the absolute value is detected to be below the threshold value, determining that the moving distance of the die on the table surface of the punch press is below the threshold value.
Further, the threshold is 110 mm.
The threshold value is determined by the size ratio of the table top of the punch press to the die and the structure of the stamping part during specific operation, and only needs to meet the manufacturing requirement.
Further, the first policy includes: the position of the die on the table surface of the punch press is changed to ensure that the pressure center of the die is consistent with the center of the slide block of the punch press.
Further, the changing the position of the mold on the punch press table includes one of: moving the position of the die on the table surface of the punch press to make the pressure center of the die consistent with the center of the slide block of the punch press;
the length of the die is changed to make the geometric center of the die consistent with the pressure center of the die.
As shown in fig. 2, the die center of pressure can be aligned with the punch slide center by moving the position of the die on the punch with the punch table free or by changing the die length to align the die geometric center with the center of pressure.
Further, the second policy includes: step s202, judging whether the die can adjust the blanking sequence;
step s204, if the die can adjust the blanking sequence, executing a first sub-strategy;
in step s206, if the die is not capable of adjusting the blanking order, the second sub-strategy is executed.
Further, the first sub-strategy includes adjusting a blanking order of the die stock to achieve a die center of pressure that is consistent with a punch slide center.
As shown in fig. 3, the blanking sequence of the die stock is adjusted to achieve the die center of pressure to coincide with the punch slide center.
Further, the second sub-strategy includes adding pre-punched holes on the die to achieve a die center of pressure that coincides with the punch press slide center. The three adjusting modes are set, so that the die center aligning method has more application range, has respective advantages and defects, and can be flexibly applied according to the characteristics of products in the actual die design application so as to achieve a reasonable design scheme. The flexibility of the centering method is further improved, and the application range of the centering method is enlarged.
As shown in fig. 4, i.e., for a blanking sequence that cannot be adjusted and the punch table is saturated, the pre-punch is added to achieve a die center of pressure that is coincident with the punch slide center.
The working principle is as follows: referring to fig. 1-5, a method for balancing a pressure center of an iron core stamping die according to an embodiment of the present invention includes aligning a length direction of a die with a moving direction of a stamping table, placing and fixing the die, obtaining a moving distance of the die on the table of a stamping machine, determining whether the moving distance is greater than or equal to a threshold value according to the obtained moving distance of the die on the table of the stamping machine, executing a first strategy on the die if the distance is greater than or equal to the threshold value, executing a second strategy on the die if the distance is less than the threshold value, after balancing the pressure center of the die by the above method, significantly improving a cutting edge of the die and stability of the die before, protecting parallelism of a slider of the stamping machine to a certain extent, improving stability of the die, and setting three die adjustment modes, the method for aligning the center of the die has more application range, and the three adjusting modes have respective advantages and defects, and can be flexibly applied according to the characteristics of the product in the actual die design application to achieve a more reasonable design scheme.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method of balancing the center of pressure of an iron core stamping die, comprising:
acquiring the moving distance of the die on the table surface of the punch;
judging whether the movable distance is above or equal to a threshold value according to the obtained movable distance of the die on the table surface of the punch press;
if the distance is above or equal to a threshold, executing a first strategy on the mold;
if the distance is below a threshold, a second policy is executed on the mold.
2. The method of claim 1, wherein said determining whether the distance is above or equal to a threshold value based on the distance the mold travels on the punch press deck comprises: obtaining a difference value between the length of the table surface of the punch press and the length of the die, wherein the length is pointed to be the moving direction of the die;
and judging whether the distance is above or equal to a threshold value based on the difference between the length of the table surface of the punch press and the length of the die.
3. The method of claim 2, wherein the determining whether the distance is above or equal to a threshold based on a difference in the length of the punch press land and the length of the die comprises: acquiring the length of the table top of the punch press and the absolute value corresponding to the difference value of the lengths of the dies;
detecting whether the absolute value is above or equal to a threshold;
if the absolute value is detected to be above or equal to the threshold value, determining that the moving distance of the die on the table surface of the punch press is above or equal to the threshold value;
and if the absolute value is detected to be below the threshold value, determining that the moving distance of the die on the table surface of the punch press is below the threshold value.
4. The method of any one of claims 1-3, wherein the threshold value is 110 mm.
5. The method of claim 1, wherein the first policy comprises: the position of the die on the table surface of the punch press is changed to ensure that the pressure center of the die is consistent with the center of the slide block of the punch press.
6. The method of claim 5, wherein the changing the position of the die on the punch press platen comprises one of: moving the position of the die on the table surface of the punch press to make the pressure center of the die consistent with the center of the slide block of the punch press;
the length of the die is changed to make the geometric center of the die consistent with the pressure center of the die.
7. The method of claim 1, wherein the second policy comprises: judging whether the die can adjust the blanking sequence;
if the die can adjust the blanking sequence, executing a first sub-strategy;
if the die is not capable of adjusting the blanking order, a second sub-strategy is executed.
8. The method of claim 7, wherein the first sub-strategy includes adjusting a blanking sequence of die stock to achieve a die center of pressure that is coincident with a punch slide center.
9. The method of claim 8, wherein the second sub-strategy comprises adding pre-punched holes in the die to achieve a die center of pressure that coincides with a punch press slide center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110756789.3A CN113500132B (en) | 2021-07-05 | 2021-07-05 | Method for balancing pressure center of iron core stamping die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110756789.3A CN113500132B (en) | 2021-07-05 | 2021-07-05 | Method for balancing pressure center of iron core stamping die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113500132A true CN113500132A (en) | 2021-10-15 |
| CN113500132B CN113500132B (en) | 2023-12-22 |
Family
ID=78011717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110756789.3A Active CN113500132B (en) | 2021-07-05 | 2021-07-05 | Method for balancing pressure center of iron core stamping die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113500132B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417305A (en) * | 2008-11-06 | 2009-04-29 | 四川集成天元模具制造有限公司 | Method for adjusting mold pressure center using nitrogen gas spring |
| CN101837421A (en) * | 2009-03-18 | 2010-09-22 | 吴远东 | Novel multi-station change table mechanism of metal forming machinery |
| CN102930133A (en) * | 2012-09-24 | 2013-02-13 | 安徽埃力智能科技有限公司 | Integrated rapid balance and gait assessment system and method |
| CN103919654A (en) * | 2013-01-15 | 2014-07-16 | 株式会社东芝 | Support Apparatus And Support Method |
-
2021
- 2021-07-05 CN CN202110756789.3A patent/CN113500132B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417305A (en) * | 2008-11-06 | 2009-04-29 | 四川集成天元模具制造有限公司 | Method for adjusting mold pressure center using nitrogen gas spring |
| CN101837421A (en) * | 2009-03-18 | 2010-09-22 | 吴远东 | Novel multi-station change table mechanism of metal forming machinery |
| CN102930133A (en) * | 2012-09-24 | 2013-02-13 | 安徽埃力智能科技有限公司 | Integrated rapid balance and gait assessment system and method |
| CN103919654A (en) * | 2013-01-15 | 2014-07-16 | 株式会社东芝 | Support Apparatus And Support Method |
Non-Patent Citations (1)
| Title |
|---|
| 王娟: "级进模压力中心的确定及优化方法", 《工程科技I辑-金属学及金属工艺》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113500132B (en) | 2023-12-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20050211032A1 (en) | Cutting technology for metal sheet | |
| US9844809B2 (en) | Forming tools having textured surfaces | |
| CN101549380B (en) | Resilience control method for moulding top surface of car roof | |
| KR101479218B1 (en) | Press moulding apparatus using Belleville spring | |
| CN206702064U (en) | A kind of backboard punching trimming marks mould | |
| CN104624805A (en) | Refrigerator rear plate blanking and flanging mould | |
| CN105665531A (en) | Inclined wedge stamping mechanism, stamping die and stamping method for vehicle door hinge reinforcing plate | |
| CN113500132A (en) | Method for balancing pressure center of iron core stamping die | |
| US20200346268A1 (en) | Press molding device and manufacturing method thereof | |
| CN204486592U (en) | Refrigerator backboard stamping-out flanging die | |
| CN102029311A (en) | Processing technique for compressor shell | |
| CN106944794A (en) | A kind of auto parts and components production method | |
| JP3070285B2 (en) | Press working method and device | |
| US11331870B2 (en) | Mold assembly for shaping and cutting sock liners | |
| CN105537396A (en) | Novel die for U-shaped automobile supporting frame | |
| CN114346070A (en) | Partition forming method for inner plate of automobile stand column | |
| CN105033047A (en) | Processing technique of upper and lower pieces of axle case | |
| CN108262390B (en) | Method and device for determining cutter position of cutter die row | |
| CN207606153U (en) | Precise punching die | |
| CN207414118U (en) | A kind of punching die on part inclined surface | |
| CN111633120A (en) | Amortization piece modulus of continuity of shaping in area mould | |
| CN207414167U (en) | A kind of convex closure in sheet member shrinks finishing mold | |
| CN207508068U (en) | A kind of sheet metal shaving die | |
| CN105345555A (en) | Single-induction three-pneumatic punching fixture | |
| CN210160233U (en) | Die capable of quickly mounting cutting die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 213000 No.18, Yangyuan Road, Yaoguan Town, Wujin District, Changzhou City, Jiangsu Province Applicant after: Yuma precision technology (Jiangsu) Co.,Ltd. Address before: 213000 No.18, Yangyuan Road, Yaoguan Town, Wujin District, Changzhou City, Jiangsu Province Applicant before: Yuma precision technology (Jiangsu) Co.,Ltd. Address after: 213000 No.18, Yangyuan Road, Yaoguan Town, Wujin District, Changzhou City, Jiangsu Province Applicant after: Yuma precision technology (Jiangsu) Co.,Ltd. Address before: 213000 No.18, Yangyuan Road, Yaoguan Town, Wujin District, Changzhou City, Jiangsu Province Applicant before: CHANGZHOU YUMA PRECISION STAMPING PARTS CO.,LTD. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |