CN114523294A - Hybrid-driven energy accumulator end socket deep drawing drilling device - Google Patents

Hybrid-driven energy accumulator end socket deep drawing drilling device Download PDF

Info

Publication number
CN114523294A
CN114523294A CN202210326881.0A CN202210326881A CN114523294A CN 114523294 A CN114523294 A CN 114523294A CN 202210326881 A CN202210326881 A CN 202210326881A CN 114523294 A CN114523294 A CN 114523294A
Authority
CN
China
Prior art keywords
plate
drilling
hoisting
die
lower die
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.)
Pending
Application number
CN202210326881.0A
Other languages
Chinese (zh)
Inventor
周相文
孟宝
任凯
韩金宝
张国庆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hengshui Dongmo Precision Metal Products Co ltd
Beihang University
Original Assignee
Hengshui Dongmo Precision Metal Products Co ltd
Beihang University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hengshui Dongmo Precision Metal Products Co ltd, Beihang University filed Critical Hengshui Dongmo Precision Metal Products Co ltd
Priority to CN202210326881.0A priority Critical patent/CN114523294A/en
Publication of CN114523294A publication Critical patent/CN114523294A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P23/00Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B23P23/04Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

A hybrid-driven energy accumulator end socket deep drawing and drilling device relates to the technical field of hydraulic press deep drawing and drilling automation and comprises an upper die part, a lower die part and a drilling part. The upper die part comprises an upper die plate, a blank pressing oil cylinder, a convex die holder, a convex die, a blank pressing ring base plate and a blank pressing ring, and the lower die part comprises a lower die holder, a lower die holder vertical plate, a concave die holder, a knockout plate and a knockout spring. The drilling part comprises a drilling power part and a drilling feeding part, the drilling power part comprises a direct-current speed regulating motor, a motor mounting seat, a hoisting plate, a drill bit, a drill bushing fixing seat, a hoisting rod, a hoisting plate screw, a hoisting plate spring, a wire gauge seat and a wire gauge mounting plate, and the drilling feeding part comprises a servo motor, a bevel gear, a ball screw, a nut, a bearing and a screw rod moving mounting plate. The invention has high automation degree, can finish two procedures of stretching and drilling once, avoids the positioning error of secondary clamping, can eliminate partial deformation stress after drilling and improves the stability of the blank.

Description

Hybrid-driven energy accumulator end socket deep drawing drilling device
Technical Field
The invention relates to the technical field of hydraulic press deep drawing and drilling automation, in particular to a hybrid-driven energy accumulator end socket deep drawing and drilling device.
Background
The production process of similar products in the current market mainly comprises the steps of preparing a seal head, completing the stamping preparation by a stamping machine through a die, and then machining. Because this head is mostly butterfly or bowl type, alignment is very difficult when carrying out mechanical clamping, though each producer has designed various types of clamping processing frock and has improved the speed and the precision of clamping, because the relatively poor reason of the stability of blank preparation, causes head machining precision and efficiency all not ideal.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a hybrid-driven energy accumulator end socket deep drawing and drilling device which is compact in structure, convenient to operate and high in automation degree, can complete two procedures of deep drawing and drilling at one time, avoids the positioning error of secondary clamping, and can eliminate partial deformation stress after drilling to improve the stability of a blank.
In order to solve the problems, the invention adopts the following technical scheme: a hybrid-driven energy accumulator end socket deep drawing and drilling device is characterized by comprising an upper die part, a lower die part and a drilling part,
the upper die part comprises an upper die plate, a blank holder oil cylinder, a convex die holder, a convex die, a blank holder backing plate and a blank holder, the upper die plate is provided with a connecting structure which is installed with a punching machine, the convex die holder is arranged at the center of the bottom of the upper die plate, the convex die is arranged at the lower end of the convex die holder, the blank holder oil cylinder is arranged around the bottom of the upper die plate, the lower end of a piston rod of the blank holder oil cylinder is fixed on the blank holder backing plate, the blank holder is fixed at the bottom of the blank holder backing plate, the blank holder backing plate and the blank holder are provided with through holes which are matched with the convex die at the centers,
the lower die part comprises a lower die base, a lower die base vertical plate, a female die base, a knockout plate and a knockout spring, wherein the lower die base vertical plate is positioned above the working table surface of the punching machine, the lower die base is fixed at the upper end of the lower die base vertical plate, three grooves are uniformly distributed on the upper end surface of the lower die base, the knockout plate and the knockout spring are arranged in the grooves, the knockout spring is positioned behind the knockout plate, the edge of the upper end surface of the knockout plate, which is close to the center of the female die, is provided with a transition fillet, the female die base is arranged above the lower die base, the female die is accommodated in the female die base,
the drilling part comprises a drilling power part and a drilling feeding part,
the drilling power part comprises a direct current speed regulating motor, a motor mounting seat, a hoisting plate, a drill bit, a drill bushing fixing seat, a hoisting rod, a hoisting plate screw, a hoisting plate spring, a wire gauge seat and a wire gauge mounting plate, the drilling power part is hoisted below the hoisting plate, the hoisting plate is embedded in a groove of a vertical plate of a lower die seat, the drill bushing fixing seat is arranged at the central part above the hoisting plate, the drill bushing is embedded in the center of the drill bushing fixing seat, four hoisting rods are arranged on the drill bushing fixing seat, the lower end of the hoisting rod is connected with the hoisting plate, the lower end of the hoisting plate is connected with the motor mounting seat through the hoisting plate screw and the hoisting plate spring, the direct current speed regulating motor is arranged below the motor mounting seat, the output shaft of the direct current speed regulating motor is connected with the drill bit, one side of the motor mounting seat is provided with the wire gauge seat, the wire gauge is fixed on the wire gauge mounting plate, the wire gauge is matched with the wire gauge seat, one end of the wire gauge mounting plate is fixed on the hoisting plate, the other end of the wire gauge mounting plate is connected with the screw rod moving mounting plate,
the drilling and feeding part comprises a servo motor, a bevel gear, a ball screw, a nut, a bearing and a screw moving mounting plate, wherein the servo motor is installed in a mounting hole of a lower die base vertical plate, the bevel gear is installed on a main shaft of the servo motor, the other bevel gear is installed on the ball screw, one end of the ball screw is installed on the hoisting plate through the bearing, the other end of the ball screw is installed on the screw moving mounting plate through the bearing, the nut is arranged on the motor mounting base, and the ball screw and the nut are matched.
Further: the dust ring mounting seat is arranged between the hanging rod and the hoisting plate, the dust ring is arranged between the upper end of the dust ring mounting seat and the hanging rod, and a linear bearing is arranged between the lower end of the dust ring mounting seat and the hanging rod.
Further: the lower die base vertical plate is also provided with a first high-pressure airflow nozzle and a second high-pressure airflow nozzle.
The invention has the beneficial effects that:
1. the automatic drilling device is compact in structure, convenient to operate and high in automation degree, can finish two procedures of stretching and drilling once, avoids the positioning error of secondary clamping, and can eliminate partial deformation stress after drilling to improve the stability of a blank. Meanwhile, the hydraulic press can be conveniently applied to the existing hydraulic press, complex modification is not needed, the processes and labor are saved, and the processing efficiency and precision are improved.
2. Three grooves are uniformly distributed on the upper end face of the lower die holder, a knockout plate and a knockout spring are contained in the grooves, the knockout spring is positioned behind the knockout plate, and transition fillets are arranged on edges of the knockout plate, which are close to the upper end face of the center of the female die. The structural design enables the ramming plate to be pushed to move outwards along the transition fillet of the ramming plate when the male die is pressed downwards, the ramming spring is compressed, the ramming plate always abuts against the outer wall of the male die under the action of the ramming spring, the ramming plate can block the upper end face of a workpiece when the male die returns, the workpiece is stripped from the male die and falls onto the hoisting plate, and the workpiece is sent into the material basket through the material pushing cylinder. The process of manually stripping the workpiece is saved, and time and labor are saved.
3. The lower die base vertical plate is also provided with a first high-pressure airflow nozzle and a second high-pressure airflow nozzle. When drilling, the controller controls the air valve to be opened, the drill bit is blown through the first high-pressure air flow nozzle to be cooled, and scrap iron falling to the position of the drill bushing fixing seat on the hoisting plate is blown away through the second high-pressure air flow nozzle, so that the problems of cooling of the drill bit and clearing of the scrap iron are solved.
4. The dust ring mounting seat is arranged between the hanging rod and the hoisting plate, the dust ring is arranged between the upper end of the dust ring mounting seat and the hanging rod, and a linear bearing is arranged between the lower end of the dust ring mounting seat and the hanging rod. The structural design can ensure that the hoisting plate moves stably and accurately relative to the hoisting rod, the hoisting rod is positioned accurately, and dust and scrap iron can be effectively prevented from entering the linear bearing to influence the operation and reduce the service life.
5. The drill bushing fixing seat is arranged at the center of the upper surface of the hoisting plate, the drill bushing is embedded in the center of the drill bushing fixing seat, the structural design can ensure the drilling precision, scrap iron can be prevented from entering a working area of the motor, and the stable operation and precision of processing are ensured.
6. The lower extreme of hanger plate is connected with the motor mount pad through hanger plate screw and hanger plate spring, and this kind of structural design can guarantee to inlay the drill bushing contact on the drill bushing fixing base and compress tightly the work piece location back, continues to move ahead through compression spring motor, realizes the purpose of accurate drilling.
7. The hybrid drive comprises a blank pressing oil cylinder, a servo motor provides power for a drilling process, and a pneumatic part for cleaning waste materials is added. The hydraulic, motor and pneumatic hybrid driving modes can fully play the advantages of different driving modes, so that the full-automatic deep-drawing and drilling device is more compact and reasonable in structure.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the construction of the lower die portion and the drilling portion of the present invention;
fig. 3 is an enlarged view of a in fig. 2.
In the figure: 1, 2, a blank holder cylinder, 3, a male die holder, 4, a blank holder backing plate, 5, a blank holder, 6, a male die, 7, a lower die holder vertical plate, 8, a lower die holder, 9, a knockout plate, 10, a knockout spring, 11, a female die holder, 12, a 13, a 14, a hoisting plate, 15, a suspender, 16, a 17, a hanger spring, 18, a motor mount, 19, a gauge mount, 20, a 21, a lead screw moving mount, 22, a direct current speed regulating motor, 23, a 24, a second, a high-pressure air jet, 25, a first, a 26, a dust ring mount, 27, a linear bearing, 28, a bevel gear, 30, a 31, a punch table, 32, a 33, a drill bush mount, 34, 35, a hanger screw, 36, a servo motor and 37.
Detailed Description
As shown in fig. 1, 2 and 3, the hybrid-driven energy accumulator end socket deep drawing and drilling device comprises an upper die part, a lower die part and a drilling part.
The upper die part comprises an upper die plate 1, a blank holder oil cylinder 2, a convex die holder 3, a convex die 6, a blank holder base plate 4 and a blank holder 5, the upper die plate 1 is provided with a connecting structure installed with a punching machine, the convex die holder 3 is arranged at the center of the bottom of the upper die plate 1, the convex die 6 is arranged at the lower end of the convex die holder 3, the blank holder oil cylinder 2 is arranged around the bottom of the upper die plate 1, the lower end of a telescopic rod of the blank holder oil cylinder 2 is fixed on the blank holder base plate 4, the blank holder 5 is fixed at the bottom of the blank holder base plate 4, and through holes matched with the convex die 6 are formed in the centers of the blank holder base plate 4 and the blank holder 5.
The lower die part comprises a lower die base 8, a lower die base vertical plate 7, a female die 12, a female die base 11, a knockout plate 9 and knockout springs 10, wherein the lower die base vertical plate 7 is positioned above a working table surface 31 of the punching machine, the lower die base 8 is fixed at the upper end of the lower die base vertical plate 7, three grooves are uniformly distributed on the upper end surface of the lower die base 8, the knockout plate 9 and the knockout springs 10 are arranged in the grooves, the knockout springs 10 are positioned behind the knockout plate 9, transition fillets are arranged on edges of the upper end surface of the knockout plate 9, which is close to the center of the female die 12, a female die base 11 is arranged above the lower die base 8, and the female die 12 is arranged in the female die base 11.
The drilling part comprises a drilling power part and a drilling feeding part.
The drilling power part comprises a direct current speed regulating motor 22, a motor mounting seat 18, a hoisting plate 14, a drill bit 16, a drill bushing 32, a drill bushing fixing seat 33, a hanging rod 15, a hanging plate 34, a hanging plate screw 35, a hanging plate spring 17, a wire gauge seat 19, a wire gauge mounting plate 20 and a wire gauge 30, the drilling power part is hoisted below the hoisting plate 14, the hoisting plate 14 is embedded in a groove of a lower die seat vertical plate 7, the drill bushing fixing seat 33 is installed at the central part above the hoisting plate 14, the drill bushing 32 is embedded in the center of the drill bushing fixing seat 33, the four hanging rods 15 are installed on the drill bushing fixing seat 33, the lower end of each hanging rod 15 is connected with the hanging plate 34, the lower end of each hanging plate 34 is connected with the motor mounting seat 18 through the hanging plate screw 35 and the hanging plate spring 17, the direct current speed regulating motor 22 is installed below the motor mounting seat 18, the output shaft of the direct current speed regulating motor 22 is connected with the drill bit 16, the wire gauge seat 19 is installed on one side of the motor mounting seat 18, the wire gauge 30 is fixed on the wire gauge mounting plate 20, the wire gauge 30 is matched with the wire gauge seat 19, one end of the wire gauge mounting plate 20 is fixed on the hoisting plate 14, and the other end of the wire gauge mounting plate 20 is connected with the screw rod moving mounting plate 21.
The drilling feeding part comprises a servo motor 36, a bevel gear 29, a ball screw 31, a nut 23, a bearing and a screw moving mounting plate 21, wherein the servo motor 36 is installed in a mounting hole of the lower die base vertical plate 7, the bevel gear 29 is installed on a main shaft of the servo motor 36, the other bevel gear 36 is installed on the ball screw 31, one end of the ball screw 31 is installed on the hoisting plate 14 through the bearing, the other end of the ball screw is installed on the screw moving mounting plate 21 through the bearing, the nut 23 is arranged on the motor mounting seat 18, and the ball screw 31 is matched with the nut 23.
A dust ring mounting seat 26 is arranged between the hanging rod 15 and the hanging plate 14, a dust ring 28 is arranged between the upper end of the dust ring mounting seat 26 and the hanging rod 15, and a linear bearing 27 is arranged between the lower end of the dust ring mounting seat 26 and the hanging rod 15.
The lower die base vertical plate 7 is also provided with a first high-pressure air flow nozzle 25 and a second high-pressure air flow nozzle 24.
During processing, firstly, the material sheet 13 is placed on the female die 12, when the male die 6 presses the material sheet 13 to reach the position A, the workpiece 37 pushes the material beating plate 9 away from the outer side along the transition round angle of the material beating plate 9, so that the material beating spring 10 is compressed, and the material beating plate 9 is always pressed against the outer wall of the male die 6 under the action of the material beating spring 10. When the punch 6 presses the material sheet 13 to reach the position B in the downward direction, the punch 6 stops moving downward, the servo motor 36 rotates rapidly and drives the ball screw 31 to rotate through the bevel gear 29, the nut 23 drives the whole drilling part to rapidly approach the workpiece 37 at the position B through the motor mounting seat 18, the servo motor 36 moves slowly after approaching the workpiece 37, the drill bushing fixing seat 33 is pushed by the four suspension rods 15 to cling to the surface of the workpiece 37, at the moment, the direct-current speed regulating motor 22 drives the drill bit 16 to rotate, the hanger plate screw 35 positions the drill bushing 32 to the center of the workpiece 37 at the position B through compressing the hanger plate spring 17 for drilling, and simultaneously, the air valve is opened, the drill bit is blown through the first high-pressure air flow nozzle 25 to cool the drill bit, scrap iron falling to the position of the drill bushing fixing seat 33 on the hoisting plate 14 is blown away through the second high-pressure air flow nozzle 24, the air valve is closed after the hole is drilled, and the servo motor 36 rapidly rotates reversely to drive the whole drilling part to rapidly return. The punch 6 descends again, the workpiece 37 completely leaves the knockout plate 9 of the female die 12, the upper end face of the workpiece 37 is blocked, the workpiece 37 is peeled off from the punch 6 and falls to the C position, the material pushing cylinder drives the material pushing plate to be sent into the charging basket, and one working cycle is completed.
The present invention is not limited to the above-described embodiments.

Claims (3)

1. A hybrid-driven energy accumulator end socket deep drawing and drilling device is characterized by comprising an upper die part, a lower die part and a drilling part,
the upper die part comprises an upper die plate, a blank holder oil cylinder, a convex die holder, a convex die, a blank holder backing plate and a blank holder, the upper die plate is provided with a connecting structure which is installed with a punching machine, the convex die holder is arranged at the center of the bottom of the upper die plate, the convex die is arranged at the lower end of the convex die holder, the blank holder oil cylinder is arranged around the bottom of the upper die plate, the lower end of a piston rod of the blank holder oil cylinder is fixed on the blank holder backing plate, the blank holder is fixed at the bottom of the blank holder backing plate, the blank holder backing plate and the blank holder are provided with through holes which are matched with the convex die at the centers,
the lower die part comprises a lower die base, a lower die base vertical plate, a female die base, a knockout plate and a knockout spring, wherein the lower die base vertical plate is positioned above the working table surface of the punching machine, the lower die base is fixed at the upper end of the lower die base vertical plate, three grooves are uniformly distributed on the upper end surface of the lower die base, the knockout plate and the knockout spring are arranged in the grooves, the knockout spring is positioned behind the knockout plate, the edge of the upper end surface of the knockout plate, which is close to the center of the female die, is provided with a transition fillet, the female die base is arranged above the lower die base, the female die is accommodated in the female die base,
the drilling part comprises a drilling power part and a drilling feeding part,
the drilling power part comprises a direct current speed regulating motor, a motor mounting seat, a hoisting plate, a drill bit, a drill bushing fixing seat, a hoisting rod, a hoisting plate screw, a hoisting plate spring, a wire gauge seat and a wire gauge mounting plate, the drilling power part is hoisted below the hoisting plate, the hoisting plate is embedded in a groove of a lower die seat vertical plate, the drill bushing fixing seat is arranged at the central part above the hoisting plate, the drill bushing is embedded in the center of the drill bushing fixing seat, four hoisting rods are arranged on the drill bushing fixing seat, the lower end of each hoisting rod is connected with the hoisting plate, the lower end of each hoisting plate is connected with the motor mounting seat through the hoisting plate screw and the hoisting plate spring, the direct current speed regulating motor is arranged below the motor mounting seat, the output shaft of the direct current speed regulating motor is connected with the drill bit, the wire gauge seat is arranged on one side of the motor mounting seat, the wire gauge is fixed on the wire gauge mounting plate, the wire gauge mounting plate is matched with the wire gauge seat, one end of the wire gauge mounting plate is fixed on the hoisting plate, the other end of the wire gauge mounting plate is connected with the screw rod moving mounting plate,
the drilling and feeding part comprises a servo motor, a bevel gear, a ball screw, a nut, a bearing and a screw moving mounting plate, wherein the servo motor is installed in a mounting hole of a lower die base vertical plate, the bevel gear is installed on a main shaft of the servo motor, the other bevel gear is installed on the ball screw, one end of the ball screw is installed on the hoisting plate through the bearing, the other end of the ball screw is installed on the screw moving mounting plate through the bearing, the nut is arranged on the motor mounting base, and the ball screw and the nut are matched.
2. The hybrid driving energy accumulator end socket deep drawing drilling device as claimed in claim 1, wherein a dust ring mounting seat is arranged between the suspension rod and the hoisting plate, a dust ring is arranged between the upper end of the dust ring mounting seat and the suspension rod, and a linear bearing is arranged between the lower end of the dust ring mounting seat and the suspension rod.
3. The hybrid driving energy accumulator end socket deep drawing and drilling device as claimed in claim 1 or 2, wherein the lower die base vertical plate is further provided with a first high-pressure air flow nozzle and a second high-pressure air flow nozzle.
CN202210326881.0A 2022-03-30 2022-03-30 Hybrid-driven energy accumulator end socket deep drawing drilling device Pending CN114523294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210326881.0A CN114523294A (en) 2022-03-30 2022-03-30 Hybrid-driven energy accumulator end socket deep drawing drilling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210326881.0A CN114523294A (en) 2022-03-30 2022-03-30 Hybrid-driven energy accumulator end socket deep drawing drilling device

Publications (1)

Publication Number Publication Date
CN114523294A true CN114523294A (en) 2022-05-24

Family

ID=81626597

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210326881.0A Pending CN114523294A (en) 2022-03-30 2022-03-30 Hybrid-driven energy accumulator end socket deep drawing drilling device

Country Status (1)

Country Link
CN (1) CN114523294A (en)

Similar Documents

Publication Publication Date Title
CN212857383U (en) Rotating disc type deburring device for tubular parts
CN116652088B (en) Forging and pressing location frock
CN217045402U (en) Hybrid-driven energy accumulator end socket deep drawing drilling device
CN219233674U (en) Multistation integration stamping mechanism
CN219074189U (en) Stamping die capable of automatically demolding
CN114523294A (en) Hybrid-driven energy accumulator end socket deep drawing drilling device
CN202780525U (en) Air clamper for machine tool
CN209811027U (en) Auto-parts mold processing
CN209124805U (en) A kind of forging and forming device
CN2855571Y (en) Shape-formation mould device for plate-material with cutting function together with reparing function
CN207710223U (en) A kind of processing unit (plant) for solenoid valve riveting damper
CN211540268U (en) Station conversion assembly of motor shaft hole machining equipment
CN208555620U (en) Stamping die is used in a kind of mechanical equipment accessory production of anti-burr
CN202010721U (en) Molding press punching device for cathode line of electrostatic dust collector
CN208288765U (en) Waist-shaped hole stamping device
CN212857405U (en) Gear shaft gear pressing forming tool
CN113145849B (en) Forming method of double-edge planing tool blank
CN220614382U (en) Hollow thin-wall part pressing device
CN216227104U (en) Duplex position balancing piece drilling tool
CN220862626U (en) Die plate tooling die of press machine
CN219817775U (en) Press convenient to work piece removes
CN217252058U (en) Hole flanging area chamfer device
CN110355274A (en) A kind of flat-plate compressed circular arc technique and half versatility mould structure and its application method
CN107900649A (en) A kind of processing unit (plant) and processing method for solenoid valve riveting damper
CN219444204U (en) Perforating device for mold processing

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