CN118002735A - Anti-shifting device in bar upsetting process - Google Patents
Anti-shifting device in bar upsetting process Download PDFInfo
- Publication number
- CN118002735A CN118002735A CN202410207781.5A CN202410207781A CN118002735A CN 118002735 A CN118002735 A CN 118002735A CN 202410207781 A CN202410207781 A CN 202410207781A CN 118002735 A CN118002735 A CN 118002735A
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- fixedly connected
- thrust
- bar
- adjusting
- cylinder
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Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 210000000078 claw Anatomy 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 210000001847 jaw Anatomy 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 210000003781 tooth socket Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/10—Manipulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses an anti-channeling device in a bar upsetting process, which comprises an adjusting plate, wherein a first adjusting component is arranged on the adjusting plate and can enable the adjusting plate to move up and down; the adjusting plate is connected with a second adjusting component, and a pushing component matched with the second adjusting component is arranged below the second adjusting component. According to the invention, a thrust maintaining cylinder is added behind the clamping jaw clamping mechanism, when the clamping jaw clamping mechanism pushes a bar to be processed into the upsetting machine and the bar upsetting process is performed, the thrust of the cylinder to the bar is dynamically adjusted through the force born by the clamping jaw clamping mechanism acquired by the stress sensor, the axial stress of the bar is counteracted, the stress of the clamping jaw clamping related mechanism is reduced, the air pressure of the cylinder is regulated in a double closed-loop regulation mode, the air pressure of the cylinder is controlled in a closed-loop mode according to the air pressure of the upsetting machine, and the air pressure of the cylinder is finely regulated in a closed-loop mode according to the stress sensor data of the clamping jaw clamping mechanism.
Description
Technical Field
The invention relates to the technical field of machining, in particular to an anti-shifting device in a bar upsetting process.
Background
Upsetting is a forging process in which the billet height is reduced and the cross section is increased. If the local cross section of the blank is increased, the upsetting is called local upsetting, and the upsetting comprises the steps of obtaining a forging with a larger cross section and a smaller height from the blank with a smaller cross section; the cross section of the blank is enlarged and the end face is flattened before punching; the forging ratio in the next drawing is improved; the transverse mechanical property of the forging is improved, and the anisotropy is reduced; repeated upsetting and drawing to break up carbide in the alloy tool steel and to make it distributed homogeneously.
The upsetting process of the bar is to heat the bar, then apply pressure to the end to be added of the bar, extrude the end of the bar into a required shape, and the stress is very large in the whole process and can reach more than 1000 KN; although the upsetting machine is fixed by a clamping mechanism, the bar always has a certain deformation in the compression process and has the condition of axial movement, and the clamping accuracy of the clamping mechanism is affected due to the fact that the clamping jaw needs to be adjusted in the fine diameter clamping process, the self structure, the control motor and the sensor are matched with each other precisely, and the movement can directly cause deformation and even damage of the clamping jaw clamping system once generated.
Therefore, we propose an anti-channeling device in the upsetting process of bar stock to solve the above problems.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, an embodiment of the present invention provides an anti-play device in a bar upsetting process, so as to solve the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: an anti-channeling device in a bar upsetting process comprises an adjusting plate, wherein a first adjusting component is arranged on the adjusting plate, and the first adjusting component can enable the adjusting plate to move up and down; the adjusting plate is connected with a second adjusting component, and a pushing component matched with the second adjusting component is arranged below the second adjusting component; the pushing assembly is connected with a driving assembly, the pushing assembly is connected with a clamping assembly matched with the driving assembly, and one end of the pushing assembly is positioned at one side of the clamping assembly; one side of the clamping component is provided with an upsetting machine, and the clamping component is adjusted in a double closed-loop adjusting mode.
According to the invention, a thrust maintaining cylinder is added behind the clamping jaw clamping mechanism, when the clamping jaw clamping mechanism pushes a bar to be processed into the upsetting machine and the bar upsetting process is performed, the thrust of the cylinder to the bar is dynamically adjusted through the force born by the clamping jaw clamping mechanism acquired by the stress sensor, the axial stress of the bar is counteracted, the stress of the clamping jaw clamping related mechanism is reduced, the air pressure of the cylinder is regulated in a double closed-loop regulation mode, the air pressure of the cylinder is controlled in a closed-loop mode according to the air pressure of the upsetting machine, and the air pressure of the cylinder is finely regulated in a closed-loop mode according to the stress sensor data of the clamping jaw clamping mechanism.
In a preferred embodiment, the first adjusting component comprises a first mounting plate arranged on one side of an adjusting plate, a first servo motor is fixedly connected to the first mounting plate, the first servo motor and the first mounting plate are fixed through other parts, two first guide rails are fixedly connected to the adjusting plate, first racks matched with the first guide rails are fixedly connected to the two first guide rails, and gears on a driving shaft of the first racks are meshed with gears on the driving shaft of the first servo motor.
In a preferred embodiment, the second adjusting component comprises a second mounting plate fixedly connected to the lower end of the adjusting plate, a second servo motor is fixedly connected to the second mounting plate, a first gear is fixedly connected to a driving shaft of the second servo motor, and two first guide blocks are fixedly connected to the lower end face of the second mounting plate.
In a preferred embodiment, the pushing assembly comprises a mounting plate arranged below the adjusting plate, two second guide rails matched with the first guide blocks are fixedly connected to the mounting plate, the mounting plate is fixedly connected to a second rack meshed with the first gear, the lower end face of the mounting plate is fixedly connected with a mounting seat, and a pushing cylinder is fixedly connected to the mounting seat.
In a preferred embodiment, the driving assembly comprises a fixed plate fixedly connected to the mounting plate, a third servo motor is fixedly connected to the fixed plate, a second gear is fixedly connected to a driving shaft of the third servo motor, and the driving shaft of the third servo motor penetrates through the side wall of the mounting plate and extends to the lower portion.
In a preferred embodiment, the clamping assembly comprises a third guide rail fixedly connected to the lower end of the mounting plate, a second guide block is slidably connected to the third guide rail, two connecting plates are fixedly connected to the second guide block, two symmetrical clamping claws are fixedly connected to the connecting plates, stress sensors are fixedly connected to the connecting plates, and tooth grooves matched with the second gears are formed in the stress sensors.
In a preferred embodiment, the dual closed loop adjustment mode includes a first loop adjustment mode and a second loop adjustment mode;
The first loop adjusting mode is a closed loop of pneumatic output of a hydraulic control target and a thrust maintaining mechanism of the upsetting machine;
The second loop adjustment mode is closed loop adjustment participated by a stress sensor.
In a preferred embodiment, in the first loop adjustment mode, the system receives hydraulic target data of the upsetting machine and outputs the hydraulic target data to a controller of the thrust holding cylinder through the proportion adjustment 2;
then, the difference between the two parties is made up through the adjustment coefficient;
Adjustment coefficient
Wherein R1 is the diameter of the hydraulic cylinder of the upsetter, and R2 is the diameter of the thrust maintaining cylinder;
The thrust holding cylinder controller controls the air pressure input by the thrust holding cylinder;
The controller directly controls the input of air pressure, and adjusts the air pressure in the thrust maintaining cylinder by adjusting the input of air pressure;
The thrust maintaining cylinder outputs thrust to the bar to be upset, and the thrust maintaining cylinder is directly linked with the non-upset end of the bar.
In a preferred embodiment, in the second loop adjustment mode, the upsetter outputs the first thrust under the control of the hydraulic machine controller;
The thrust maintaining cylinder outputs a second thrust under the control of the air pressure controller;
The two thrust forces act on two ends of the bar to be processed simultaneously, and the stress sensor monitors the stress condition of the claw along the axial direction of the bar;
If the set threshold value F0 is exceeded, outputting a torque control signal with the opposite stress direction to control the output of the cylinder, and counteracting the stress;
the stress counteracting signal is overlapped with the control signal calculated by the hydraulic target of the upsetting machine and then output to the thrust holding cylinder controller, so that the output of the thrust holding cylinder is controlled together, and the purpose of fine adjustment of the thrust is achieved.
The invention has the technical effects and advantages that:
According to the invention, a thrust maintaining cylinder is added behind the clamping jaw clamping mechanism, when the clamping jaw clamping mechanism pushes a bar to be processed into the upsetting machine and the bar upsetting process is performed, the thrust of the cylinder to the bar is dynamically adjusted through the force born by the clamping jaw clamping mechanism acquired by the stress sensor, the axial stress of the bar is counteracted, the stress of the clamping jaw clamping related mechanism is reduced, the air pressure of the cylinder is regulated in a double closed-loop regulation mode, the air pressure of the cylinder is controlled in a closed-loop mode according to the air pressure of the upsetting machine, and the air pressure of the cylinder is finely regulated in a closed-loop mode according to the stress sensor data of the clamping jaw clamping mechanism.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a bottom view of the present invention;
FIG. 3 is a schematic side view of the connection structure of the present invention;
FIG. 4 is a schematic view of a first partial connecting structure according to the present invention;
FIG. 5 is a schematic view of a second partial connecting structure according to the present invention;
FIG. 6 is a schematic diagram of a dual closed loop adjustment mode system;
FIG. 7 is a schematic diagram of a first loop adjustment mode according to the present invention;
FIG. 8 is a schematic diagram of a second loop adjustment mode according to the present invention;
FIG. 9 is a schematic illustration of the upsetting process in accordance with the present invention;
FIG. 10 is a graph of the horizontal stress analysis of a bar stock according to the present invention.
The reference numerals are: the device comprises a1 adjusting plate, a2 first adjusting component, a21 first mounting plate, a22 first servo motor, a23 first guide rail, a24 first rack, a3 second adjusting component, a 31 second mounting plate, a 32 second servo motor, a 33 first gear, a 34 first guide block, a4 pushing component, a 41 mounting plate, a 42 second guide rail, a 43 second rack, a 44 mounting seat, a 45 pushing cylinder, a5 driving component, a 51 fixing plate, a 52 third servo motor, a 53 second gear, a6 clamping component, a 61 third guide rail, a 62 second guide block, a 63 connecting plate, a 64 claw, a 65 stress sensor and 66 tooth sockets.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-10, an anti-moving device in a bar upsetting process comprises an adjusting plate 1, wherein a first adjusting component 2 is arranged on the adjusting plate 1, the first adjusting component 2 can enable the adjusting plate 1 to move up and down, the first adjusting component 2 comprises a first mounting plate 21 arranged on one side of the adjusting plate 1, a first servo motor 22 is fixedly connected to the first mounting plate 21, the first servo motor 22 and the first mounting plate 21 are fixed through other parts, two first guide rails 23 are fixedly connected to the adjusting plate 1, first racks 24 matched with the two first guide rails 23 are fixedly connected to the two first guide rails, and gears on driving shafts of the first racks 23 and the first servo motor 22 are meshed.
In actual operation, the first mounting plate 21 and the first servo motor 22 are mounted at the proper positions of the device through other parts, so that the device is positioned at one side above the upsetting machine, meanwhile, a gear is connected to a driving shaft of the first servo motor 22, when the first servo motor 22 works, the gear can be rotated, the rack 24 can be further moved along with the gear, the adjusting plate 1 can be further moved up and down along with the movement, the position of the clamping jaw 64 can be further changed, and the position of the bar can be changed.
Referring to fig. 2, 3 and 4, the adjusting plate 1 is connected with a second adjusting assembly 3, the second adjusting assembly 3 includes a second mounting plate 31 fixedly connected to the lower end of the adjusting plate 1, a second servo motor 32 is fixedly connected to the second mounting plate 31, a first gear 33 is fixedly connected to a driving shaft of the second servo motor 32, and two first guide blocks 34 are fixedly connected to the lower end surface of the second mounting plate 31.
Referring to fig. 2, 3 and 4, a pushing component 4 matched with the second adjusting component 3 is arranged below the second adjusting component 3, the pushing component 4 comprises a mounting plate 41 arranged below the adjusting plate 1, two second guide rails 42 matched with the first guide blocks 34 are fixedly connected to the mounting plate 41, a second rack 43 meshed with the first gear 33 is fixedly connected to the mounting plate 41, a mounting seat 44 is fixedly connected to the lower end face of the mounting plate 41, and a pushing cylinder 45 is fixedly connected to the mounting seat 44.
In actual operation, when the second servo motor 32 works, the first gear 33 can rotate along with the second servo motor, the second rack 43 can be further moved, and the mounting plate 41 can be normally moved under the assistance of the second guide rail 42 and the first guide block 34, so that bars can be normally pushed into the upsetter to be conveniently processed, and the pushing cylinder 45 can work in the subsequent process.
Referring to fig. 5, the driving assembly 5 is connected to the pushing assembly 4, the driving assembly 5 includes a fixing plate 51 fixedly connected to the mounting plate 41, a third servo motor 52 is fixedly connected to the fixing plate 51, a second gear 53 is fixedly connected to a driving shaft of the third servo motor 52, and the driving shaft of the third servo motor 52 penetrates through a side wall of the mounting plate 41 and extends to the lower side.
Referring to fig. 5, the pushing component 4 is connected with a clamping component 6 matched with the driving component 5, one end of the pushing component 4 is located at one side of the clamping component 6, the clamping component 6 comprises a third guide rail 61 fixedly connected to the lower end of the mounting plate 41, second guide blocks 62 are slidably connected to the third guide rail 61, two connecting plates 63 are fixedly connected to the second guide blocks 62, two groups of symmetrical clamping claws 64 are fixedly connected to the two connecting plates 63, stress sensors 65 are fixedly connected to the two connecting plates 63, and tooth grooves 66 matched with the second gears 53 are formed in the two stress sensors 65.
In actual operation, when the third servo motor 52 works, the second gear 53 can rotate along with it, so that the two stress sensors 65 can be close to each other, so that the two connecting plates 63 can be close to each other, and at the moment, the two clamping jaws 64 can be close to each other, so that the bar can be clamped, and further the subsequent processing requirements can be met.
Referring to fig. 6, an upsetter is arranged at one side of the clamping assembly 6, and the clamping assembly 6 is adjusted in a double closed-loop adjustment mode, wherein the double closed-loop adjustment mode comprises a first loop adjustment mode and a second loop adjustment mode; the double closed-loop adjusting mode performs the thrust output of the thrust maintaining cylinder together, ensures the reliability of adjustment,
Referring to fig. 7, the first loop adjustment mode is a closed loop of the hydraulic control target of the upsetter and the air pressure output of the thrust holding mechanism, by which the initial value of the air pressure output of the thrust holding cylinder can be confirmed.
In the first loop regulation mode, the system receives hydraulic target data of the upsetting machine and outputs the hydraulic target data to a controller of a thrust maintaining cylinder through proportion regulation 2;
The reason for the adjustment of the proportionality coefficient is that the diameters of the hydraulic cylinder of the upsetting machine and the diameters of the pneumatic cylinder of the thrust holding mechanism are different, so that the corresponding thrust of the pressure intensity is different; therefore, an adjustment coefficient is needed to make up the difference between the two parties;
Adjustment coefficient
Wherein R1 is the diameter of the hydraulic cylinder of the upsetter, and R2 is the diameter of the thrust maintaining cylinder;
The thrust holding cylinder controller controls the air pressure input by the thrust holding cylinder;
The controller directly controls the input of air pressure, and adjusts the air pressure in the thrust maintaining cylinder by adjusting the input of air pressure;
The thrust maintaining cylinder outputs thrust to the bar to be upset, and the thrust maintaining cylinder is directly linked with the non-upset end of the bar.
Referring to fig. 8, the second loop adjustment mode is closed loop adjustment with the participation of the stress sensor, in which the upsetter outputs the first thrust under the control of the hydraulic machine controller;
The thrust maintaining cylinder outputs a second thrust under the control of the air pressure controller;
The two thrust forces act on two ends of the bar to be processed simultaneously, and the stress sensor monitors the stress condition of the claw along the axial direction of the bar;
If the set threshold F0 is exceeded (generally set at 10-50N, 40N is selected in the scheme), outputting a torque control signal with the opposite stress direction to control the output of the cylinder, and counteracting the stress;
the stress counteracting signal is overlapped with the control signal calculated by the hydraulic target of the upsetting machine and then output to the thrust holding cylinder controller, so that the output of the thrust holding cylinder is controlled together, and the purpose of fine adjustment of the thrust is achieved.
Finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. An anti-play device in the upsetting process of bar stock is characterized in that; the device comprises an adjusting plate (1), wherein a first adjusting component (2) is arranged on the adjusting plate (1), and the first adjusting component (2) can enable the adjusting plate (1) to move up and down;
The adjusting plate (1) is connected with a second adjusting component (3), and a pushing component (4) matched with the second adjusting component (3) is arranged below the second adjusting component;
The pushing assembly (4) is connected with a driving assembly (5), the pushing assembly (4) is connected with a clamping assembly (6) matched with the driving assembly (5), and one end of the pushing assembly (4) is positioned at one side of the clamping assembly (6);
one side of the clamping component (6) is provided with an upsetting machine, and the clamping component (6) is adjusted in a double closed-loop adjusting mode.
2. The anti-play device in a bar upsetting process according to claim 1, wherein: the first adjusting component (2) comprises a first mounting plate (21) arranged on one side of an adjusting plate (1), a first servo motor (22) is fixedly connected to the first mounting plate (21), the first servo motor (22) and the first mounting plate (21) are fixed through other parts, two first guide rails (23) are fixedly connected to the adjusting plate (1), two first racks (24) matched with the first guide rails are fixedly connected to the first guide rails (23), and gears on the driving shafts of the first racks (23) and the first servo motor (22) are meshed.
3. The anti-play device in a bar upsetting process according to claim 1, wherein: the second adjusting component (3) comprises a second mounting plate (31) fixedly connected to the lower end of the adjusting plate (1), a second servo motor (32) is fixedly connected to the second mounting plate (31), a first gear (33) is fixedly connected to a driving shaft of the second servo motor (32), and two first guide blocks (34) are fixedly connected to the lower end face of the second mounting plate (31).
4. A tamper-evident device in a bar upsetting process as recited in claim 3, wherein: the pushing assembly (4) comprises a mounting plate (41) arranged below the adjusting plate (1), two second guide rails (42) matched with the first guide blocks (34) are fixedly connected to the mounting plate (41), the mounting plate (41) is fixedly connected to a second rack (43) meshed with the first gear (33), a mounting seat (44) is fixedly connected to the lower end face of the mounting plate (41), and a pushing cylinder (45) is fixedly connected to the mounting seat (44).
5. The anti-play device in a bar upsetting process according to claim 4, wherein: the driving assembly (5) comprises a fixed plate (51) fixedly connected to the mounting plate (41), a third servo motor (52) is fixedly connected to the fixed plate (51), a second gear (53) is fixedly connected to a driving shaft of the third servo motor (52), and the driving shaft of the third servo motor (52) penetrates through the side wall of the mounting plate (41) and extends to the lower portion.
6. The anti-play device in a bar upsetting process according to claim 5, wherein: the clamping assembly (6) comprises a third guide rail (61) fixedly connected to the lower end of the mounting plate (41), a second guide block (62) is fixedly connected to the third guide rail (61) in a sliding manner, two connecting plates (63) are fixedly connected to the second guide block (62), two clamping claws (64) which are symmetrical in two groups are fixedly connected to the connecting plates (63), stress sensors (65) are fixedly connected to the connecting plates (63), and tooth grooves (66) matched with the second gears (53) are formed in the stress sensors (65).
7. The anti-play device in a bar upsetting process according to claim 1, wherein: the double closed loop adjustment mode comprises a first loop adjustment mode and a second loop adjustment mode;
The first loop adjusting mode is a closed loop of pneumatic output of a hydraulic control target and a thrust maintaining mechanism of the upsetting machine;
The second loop adjustment mode is closed loop adjustment participated by a stress sensor.
8. The anti-play device in a bar upsetting process as recited in claim 7, wherein: in the first loop regulation mode, the system receives hydraulic target data of the upsetting machine and outputs the hydraulic target data to a controller of a thrust maintaining cylinder through proportion regulation 2;
then, the difference between the two parties is made up through the adjustment coefficient;
Adjustment coefficient
Wherein R1 is the diameter of the hydraulic cylinder of the upsetter, and R2 is the diameter of the thrust maintaining cylinder;
The thrust holding cylinder controller controls the air pressure input by the thrust holding cylinder;
The controller directly controls the input of air pressure, and adjusts the air pressure in the thrust maintaining cylinder by adjusting the input of air pressure;
The thrust maintaining cylinder outputs thrust to the bar to be upset, and the thrust maintaining cylinder is directly linked with the non-upset end of the bar.
9. The anti-play device in a bar upsetting process according to claim 8, wherein: in the second loop regulation mode, the upsetter outputs a first thrust under the control of the hydraulic press controller;
The thrust maintaining cylinder outputs a second thrust under the control of the air pressure controller;
The two thrust forces act on two ends of the bar to be processed simultaneously, and the stress sensor monitors the stress condition of the claw along the axial direction of the bar;
If the set threshold value F0 is exceeded, outputting a torque control signal with the opposite stress direction to control the output of the cylinder, and counteracting the stress;
the stress counteracting signal is overlapped with the control signal calculated by the hydraulic target of the upsetting machine and then output to the thrust holding cylinder controller, so that the output of the thrust holding cylinder is controlled together, and the purpose of fine adjustment of the thrust is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410207781.5A CN118002735A (en) | 2024-02-26 | 2024-02-26 | Anti-shifting device in bar upsetting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410207781.5A CN118002735A (en) | 2024-02-26 | 2024-02-26 | Anti-shifting device in bar upsetting process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118002735A true CN118002735A (en) | 2024-05-10 |
Family
ID=90944195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410207781.5A Pending CN118002735A (en) | 2024-02-26 | 2024-02-26 | Anti-shifting device in bar upsetting process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118002735A (en) |
-
2024
- 2024-02-26 CN CN202410207781.5A patent/CN118002735A/en active Pending
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