CN110883199B - Square tube punching mechanism for luggage pull rod - Google Patents
Square tube punching mechanism for luggage pull rod Download PDFInfo
- Publication number
- CN110883199B CN110883199B CN201911213558.7A CN201911213558A CN110883199B CN 110883199 B CN110883199 B CN 110883199B CN 201911213558 A CN201911213558 A CN 201911213558A CN 110883199 B CN110883199 B CN 110883199B
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- Prior art keywords
- plate
- square tube
- descending
- square
- die core
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Classifications
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- 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
- B21D28/24—Perforating, i.e. punching holes
- B21D28/28—Perforating, i.e. punching holes in tubes or other hollow bodies
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- 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
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- 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
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
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- 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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles
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- 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
- B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
- B21D45/06—Stripping-off devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention discloses a square tube punching mechanism for a luggage pull rod, which comprises a base, a descending part, a lower die and a die core, wherein a support is fixedly arranged in the middle of the rear end of the base and comprises an upright post and a top plate, the bottom of the upright post is welded with the base, and the upright post is fixedly connected with the top plate through a bolt; the descending component is positioned at the front end of the upright post and comprises a guide post, an elliptical flange type linear bearing and a descending plate; the guide posts are provided with an even number of guide posts, preferably two guide posts in the scheme, and are symmetrically arranged on the left side and the right side of the upright post, and the guide posts are slidably sleeved on the elliptical flange type linear bearing; according to the invention, the die core is arranged, so that the die core on the left side is inserted into the square pipe after the square pipe reaches the punching station, and the square pipe cannot move to the left side and cannot move back and forth and up and down; meanwhile, the die core is inserted into the square tube and can support the tube wall of the square tube, so that the square tube is not easy to deform during punching.
Description
Technical Field
The invention relates to the field of travel product production, in particular to a square tube punching mechanism for a luggage pull rod.
Background
Early luggage cases were made of wood or other heavy materials, which tended to be lighter and lighter in weight, hard plastic or cloth, as air travel became popular. Most models are also provided with built-in small wheels, the luggage case can be conveniently pulled by using a pull rod, and the luggage case with 4 small wheels can be easily pushed on a flat ground without labor except that the luggage case can be rotated by 360 degrees in 2010.
In addition, the luggage may be divided into a hard-shell luggage and a soft-shell luggage according to the outer shell. The hard-shell luggage case is relatively resistant to falling and is suitable for luggage needing more protection. Soft shell luggage is generally lighter in weight and more flexible in capacity than hard shell luggage. However, the zipper position of the soft shell luggage case is more likely to pop open due to too many items inside.
The pull rod is an indispensable component on most of travel cases, the pull rod is required to be punched when the pull rod of the travel cases is produced, the square tube adopted by the pull rod is hollow, the square tube is easy to deform due to overlarge clamping force when the square tube is clamped and fixed, and the conventional punching machine clamps the square tube through an elastic gasket so as to solve the problem; however, since the punching needle applies force to the wall of the square tube from outside to inside during punching, the square tube is easily deformed during the punching process
Disclosure of Invention
The invention aims to provide a square tube punching mechanism for a luggage pull rod, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a square tube punching mechanism for a luggage pull rod comprises a base, a descending part, a lower die and a die core, wherein a support is fixedly arranged in the middle of the rear end of the base and comprises an upright post and a top plate, the bottom of the upright post is welded with the base, and the upright post is fixedly connected with the top plate through a bolt; the descending component is positioned at the front end of the upright post and comprises a guide post, an elliptical flange type linear bearing and a descending plate; the guide columns are provided with an even number of guide columns, preferably two guide columns in the scheme, the guide columns are symmetrically arranged on the left side and the right side of the upright column, the guide columns are slidably sleeved on the elliptical flange type linear bearing, and the upper end and the lower end of each guide column are fixedly connected with the top plate and the base through bolts respectively; the lower end of the lower plate is provided with a first counter bore for mounting the elliptical flange type linear bearing; the punching cylinder is fixedly arranged at the front end of the top plate through a screw, and an output shaft of the punching cylinder penetrates through the top plate and is fixedly connected with the top of the lower plate through a screw; a punch is fixedly connected below the front end of the descending plate and is positioned right below an output shaft of the punching cylinder; the lower die is positioned above the base and comprises a lower die base, and a feeding groove is formed in the middle of the lower die base in the left-right direction; the die core is arranged on the left side of the feeding groove in a sliding mode, and a stepped hole matched with the hole is formed in the die core; the left end of the die core is connected with the base in a sliding mode through a sliding structure, the sliding structure comprises a first sliding rail, a first sliding block and a linear motor, a second countersunk hole is formed in the left end of the die core, the die core is fixedly connected with the first sliding block through a screw arranged in the second countersunk hole, and the first sliding rail is fixedly installed on the base through a screw; the linear motor is also fixedly arranged on the base through a bolt, and an output shaft of the linear motor is in driving connection with the first sliding block; the front fixing plate mounting groove has been seted up to the feed chute front end, and preceding clamp plate that slides in the front fixing plate mounting groove is equipped with, and preceding fixed plate mounting groove front end has been seted up and has been compressed tightly the cylinder mounting groove, compresses tightly fixed mounting in the cylinder mounting groove and has the cylinder that compresses tightly, compresses tightly cylinder drive connection preceding clamp plate.
Furthermore, a reinforcing rib plate is arranged between the rear side of the stand column and the lower end of the top plate, the reinforcing rib plate is fixedly connected with the stand column and the top plate through bolts, and the reinforcing rib plate is integrally in a right-angled triangle shape.
Furthermore, the elliptical flange type linear bearing is fixed with the lower plate through screws.
Furthermore, a downward pressing structure is arranged below the downward plate and comprises a lower pressing plate, the lower pressing plate is in a rectangular frame shape, guide rods are fixedly connected to four corners of the top of the lower pressing plate in a vertical upward welding mode, a countersunk hole matched with the guide rods is formed in the downward plate, a guide square flange type linear bearing is installed in the countersunk hole through screws, the guide rods are arranged in the guide square flange type linear bearing in a sliding mode, compression springs are sleeved on the guide rods, and the tops of the guide rods are further in threaded connection with limit nuts.
Further, the depth of the feeding groove is smaller than the height of the processed square pipe.
Further, the feeding groove is provided with a stripper plate, the lower die holder on the left side of the feeding groove is provided with a stripper plate mounting groove, and the stripper plate is mounted in the stripper plate mounting groove through a screw; the stripping plate is integrally concave, and the top of the stripping plate is provided with a groove for the mold insert to pass through.
Furthermore, the square tube punching mechanism X for the luggage pull rod.
Furthermore, the square tube punching mechanism X for the luggage pull rod.
Compared with the prior art, the invention has the beneficial effects that: when the square pipe punching machine works, after the square pipe is placed at a punching station, the pressing cylinder is driven and connected with the front pressing plate to clamp the square pipe, and the mold core on the left side is inserted into the square pipe, so that the square pipe cannot move towards the left side and cannot move back and forth and up and down (the cross section of the mold core is smaller than that of the inner cavity of the square pipe, and the square pipe cannot move); the punching cylinder moves downwards to drive the descending plate to move downwards, firstly, a lower pressing plate below the descending plate presses the square pipe to be punched, and the descending punch punches the hole; the die core is inserted into the square tube and can support the tube wall of the square tube, so that the square tube is not easy to deform during punching; because the inner diameters of the square pipes with different specifications are different, the selected mold core needs to be matched with the inner diameter of the square pipe; by arranging the die core, the die core on the left side is inserted into the square pipe after the square pipe reaches the punching station, so that the square pipe cannot move to the left side and cannot move back and forth and up and down; meanwhile, the die core is inserted into the square tube and can support the tube wall of the square tube, so that the square tube is not easy to deform during punching.
Drawings
Fig. 1 is a schematic structural view of a square tube punching mechanism for a luggage pull rod.
Fig. 2 is a side view of a square tube punching mechanism for a luggage pull rod.
Fig. 3 is a plan view of a square tube punching mechanism for a luggage pull rod.
Fig. 4 is a schematic structural diagram of a lower pressing plate in the square tube punching mechanism for the luggage pull rod.
Fig. 5 is a schematic structural diagram of a stripper plate in a square tube punching mechanism for a luggage pull rod.
Fig. 6 is a schematic structural diagram of a first sliding block in a square tube punching mechanism for a luggage pull rod.
Fig. 7 is a schematic structural view of a mold insert in a square tube punching mechanism for a luggage pull rod.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1 to 7, a square tube punching mechanism for a luggage pull rod includes a base 100, a descending member 300, a lower mold 500 and a mold core 600,
the middle part of the rear end of the base 100 is fixedly provided with a support 200, the support 200 comprises a vertical column 201 and a top plate 202, the bottom of the vertical column 201 is welded with the base 100, the vertical column 201 is fixedly connected with the top plate 202 through bolts,
further, a reinforcing rib plate 203 is arranged between the rear side of the upright column 201 and the lower end of the top plate 202, the reinforcing rib plate 203 is fixedly connected with the upright column 201 and the top plate 202 through bolts, and the reinforcing rib plate 203 is integrally in a right-angled triangle shape;
the descending component 300 is positioned at the front end of the upright column 201, and the descending component 300 comprises a guide pillar 301, an elliptical flange type linear bearing 302 and a descending plate 303; the guide posts 301 are provided with an even number, preferably two in the scheme, the guide posts 301 are symmetrically arranged on the left side and the right side of the upright post 201, the guide posts 301 are slidably sleeved on the elliptical flange type linear bearing 302, and the upper end and the lower end of each guide post 301 are fixedly connected with the top plate 202 and the base 100 through bolts;
the descending plate 303 is integrally concave, a first counter sink 304 for mounting the elliptical flange type linear bearing 302 is formed at the lower end of the descending plate 303, and the elliptical flange type linear bearing 302 is fixed with the descending plate 303 through screws;
the punching cylinder 400 is fixedly installed at the front end of the top plate 202 through a screw, and an output shaft of the punching cylinder 400 penetrates through the top plate 202 to be fixedly connected with the top of the lower plate 303 through a screw;
a punch 700 is fixedly connected and arranged below the front end of the descending plate 303, the punch 700 is positioned right below the output shaft of the punching cylinder 400,
a descending compaction structure 800 is arranged below the descending plate 303, the descending compaction structure 800 comprises a lower pressing plate 801, the lower pressing plate 801 is in a rectangular frame shape, guide rods 802 are fixedly connected to four corners of the top of the lower pressing plate 801 in a vertical and upward welding mode, a countersunk hole matched with the guide rods 802 is formed in the descending plate 303, a guide square flange type linear bearing 803 is installed in the countersunk hole through screws, the guide rods 802 are slidably arranged in the guide square flange type linear bearing 803, compression springs 804 are sleeved on the guide rods 802, and the top of the guide rods 802 is further in threaded connection with limit nuts 805;
the punching cylinder 400 moves downwards to drive the descending plate 303 to move downwards, firstly, a lower pressing plate 801 below the descending plate 303 presses a square tube to be punched, and the descending punch 700 punches a hole;
the lower die 500 is positioned above the base 100, the lower die 500 comprises a lower die base 501, a feeding groove 502 is formed in the middle of the lower die base 501 in the left-right direction, and the depth of the feeding groove 502 is not larger than the height of the processed square tube; meanwhile, the width of the feeding groove 502 is slightly larger than that of the processed square pipe (the range is between 1 and 5 mm);
the die core 600 is arranged on the left side of the feed chute 502 in a sliding manner, and a stepped hole 601 matched with the opened hole is formed in the die core 600; by arranging the die core 600, after the square pipe reaches the punching station, the die core 600 on the left side is inserted into the square pipe, so that the square pipe cannot move to the left side and cannot move back and forth and up and down; meanwhile, the die core 600 is inserted into the square tube and can support the tube wall of the square tube, so that the square tube is not easy to deform during punching; because the inner diameters of the square pipes with different specifications are different, the selected mold insert 600 needs to be matched with the inner diameter of the square pipe;
the left end of the mold insert 600 is slidably connected to the base 100 through a sliding structure 610, the sliding structure 610 includes a first sliding rail 611, a first sliding block 612 and a linear motor 613, the left end of the mold insert 600 is provided with a second countersunk hole 602, the mold insert 600 is fixedly connected to the first sliding block 612 through a screw disposed in the second countersunk hole 602, and the first sliding rail 611 is fixedly mounted on the base 100 through a screw; the linear motor 613 is also fixedly mounted on the base 100 through a bolt, and an output shaft of the linear motor 613 is in driving connection with the first slider 612;
further, the feeding groove 502 is provided with a stripper plate 503, the lower die holder 501 on the left side of the feeding groove 502 is provided with a stripper plate mounting groove 504, and the stripper plate 503 is mounted in the stripper plate mounting groove 504 through screws; the stripping plate 503 is concave, the top of the stripping plate 503 is provided with a groove for the mold insert 600 to pass through, and the height difference between the groove and the feed chute 502 is at least half of the thickness of the processed square tube; the grooves on the stripper plate 503 can allow the mold insert 600 to pass through so that the mold insert 600 can be inserted into the square tube, and the grooves on the stripper plate 503 limit the square tube from passing through; meanwhile, the die core 600 and the stripper plate 503 can be mounted by screws so as to adjust the specifications of the die core 600 and the stripper plate 503 according to the specific specification of the processed square tube;
the front end of the feed chute 502 is provided with a front fixing plate mounting groove 520, a front pressing plate 521 is arranged in the front fixing plate mounting groove 520 in a sliding manner, the front end of the front fixing plate mounting groove 520 is provided with a pressing cylinder mounting groove 522, a pressing cylinder 523 is fixedly mounted in the pressing cylinder mounting groove 522, and the pressing cylinder 523 is in driving connection with the front pressing plate 521;
when the square tube punching machine works, after the square tube is placed at a punching station, the pressing cylinder 523 drives and is connected with the front pressing plate 521 to clamp the square tube, and the mold insert 600 on the left side is inserted into the square tube, so that the square tube cannot move towards the left side and cannot move back and forth and up and down (the cross section of the mold insert 600 is smaller than that of the inner cavity of the square tube, and the square tube cannot move); the punching cylinder 400 moves downwards to drive the descending plate 303 to move downwards, firstly, a lower pressing plate 801 below the descending plate 303 presses a square tube to be punched, and the descending punch 700 punches a hole; the die core 600 is inserted into the square tube and can support the tube wall of the square tube, so that the square tube is not easy to deform during punching; since the square pipes of different specifications have different inner diameters, the selected mold insert 600 needs to be matched with the inner diameter of the square pipe.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (1)
1. The utility model provides a case and bag is square pipe mechanism of punching a hole for pull rod, includes base, down part, lower mould and mould benevolence, its characterized in that:
a bracket is fixedly arranged in the middle of the rear end of the base and comprises an upright post and a top plate, the bottom of the upright post is welded with the base, the upright post and the top plate are fixedly connected through a bolt,
a reinforcing rib plate is arranged between the rear side of the upright column and the lower end of the top plate, the reinforcing rib plate is respectively and fixedly connected with the upright column and the top plate through bolts, and the whole reinforcing rib plate is in a right-angled triangle shape;
the descending component is positioned at the front end of the upright post and comprises a guide post, an elliptical flange type linear bearing and a descending plate; the guide columns are provided with an even number and are symmetrically arranged on the left side and the right side of the upright column, the guide columns are slidably sleeved on the elliptical flange type linear bearing, and the upper end and the lower end of each guide column are fixedly connected with the top plate and the base through bolts respectively;
the lower plate is integrally concave, a first counter bore for mounting the elliptical flange type linear bearing is formed in the lower end of the lower plate, and the elliptical flange type linear bearing is fixed with the lower plate through a screw;
the punching cylinder is fixedly arranged at the front end of the top plate through a screw, and an output shaft of the punching cylinder penetrates through the top plate and is fixedly connected with the top of the downlink plate through a screw;
a punch is fixedly connected below the front end of the descending plate and is positioned right below the output shaft of the punching cylinder,
a descending compression structure is arranged below the descending plate and comprises a lower pressing plate, the lower pressing plate is in a rectangular frame shape, guide rods are fixedly connected to four corners of the top of the lower pressing plate in a vertical and upward welding mode, a countersunk hole matched with the guide rods is formed in the descending plate, a guide square flange type linear bearing is installed in the countersunk hole through screws, the guide rods are arranged in the guide square flange type linear bearing in a sliding mode, compression springs are sleeved on the guide rods, and the tops of the guide rods are further in threaded connection with limit nuts;
the punching cylinder moves downwards to drive the descending plate to move downwards, firstly, a lower pressing plate below the descending plate presses the square pipe to be punched, and the descending punch punches the hole;
the lower die is positioned above the base and comprises a lower die seat, a feeding groove is formed in the middle of the lower die seat in the left-right direction, and the depth of the feeding groove is not larger than the height of the processed square tube; meanwhile, the width of the feeding groove is slightly larger than that of the processed square tube and ranges from 1 mm to 5 mm;
the die core is arranged on the left side of the feeding groove in a sliding mode, and a stepped hole matched with the hole is formed in the die core; by arranging the die core, the die core on the left side is inserted into the square pipe after the square pipe reaches the punching station, so that the square pipe cannot move to the left side and cannot move back and forth and up and down; meanwhile, the die core is inserted into the square tube and can support the tube wall of the square tube, so that the square tube is not easy to deform during punching; because the inner diameters of the square pipes with different specifications are different, the selected mold core needs to be matched with the inner diameter of the square pipe;
the left end of the die core is connected with the base in a sliding mode through a sliding structure, the sliding structure comprises a first sliding rail, a first sliding block and a linear motor, a second countersunk hole is formed in the left end of the die core, the die core is fixedly connected with the first sliding block through a screw arranged in the second countersunk hole, and the first sliding rail is fixedly installed on the base through a screw; the linear motor is also fixedly arranged on the base through a bolt, and an output shaft of the linear motor is in driving connection with the first sliding block;
the feeding groove is provided with a stripper plate, the lower die holder on the left side of the feeding groove is provided with a stripper plate mounting groove, and the stripper plate is mounted in the stripper plate mounting groove through a screw; the stripping plate is integrally concave, a groove for the mold core to pass through is formed in the top of the stripping plate, and the height difference between the groove and the feeding groove is at least half of the thickness of the processed square pipe; the groove on the stripper plate can be used for the mold core to pass through so that the mold core can be inserted into the square tube, and the groove on the stripper plate limits the square tube to pass through; meanwhile, the die core and the stripper plate are installed through screws so as to adjust the specifications of the die core and the stripper plate according to the specific specification of the processed square tube;
the front fixing plate mounting groove has been seted up to the feed chute front end, and preceding clamp plate that slides in the front fixing plate mounting groove is equipped with, and preceding fixed plate mounting groove front end has been seted up and has been compressed tightly the cylinder mounting groove, compresses tightly fixed mounting in the cylinder mounting groove and has the cylinder that compresses tightly, compresses tightly cylinder drive connection preceding clamp plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911213558.7A CN110883199B (en) | 2019-12-02 | 2019-12-02 | Square tube punching mechanism for luggage pull rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911213558.7A CN110883199B (en) | 2019-12-02 | 2019-12-02 | Square tube punching mechanism for luggage pull rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110883199A CN110883199A (en) | 2020-03-17 |
| CN110883199B true CN110883199B (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911213558.7A Active CN110883199B (en) | 2019-12-02 | 2019-12-02 | Square tube punching mechanism for luggage pull rod |
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| Country | Link |
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| CN (1) | CN110883199B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111390014B (en) * | 2020-03-26 | 2021-01-29 | 燕山大学 | Square pipe shape punching device of preapring for an unfavorable turn of events |
| CN112222288B (en) * | 2020-12-17 | 2021-02-19 | 吴江市液铸液压件铸造有限公司 | Stamping device suitable for metal pipe side opening |
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| JPH0647459A (en) * | 1992-07-30 | 1994-02-22 | Usui Internatl Ind Co Ltd | Punch for perforating hollow square tube and perforating method |
| CN201516463U (en) * | 2009-10-22 | 2010-06-30 | 王晓军 | Punching apparatus for pipes |
| CN202290972U (en) * | 2011-10-19 | 2012-07-04 | 李辉 | Metal pipe punching machine |
| CN204564899U (en) * | 2015-04-07 | 2015-08-19 | 罗瑞运动用品（昆山）有限公司 | A kind of bicycle front fork punch device of self-discharging |
| CN204603007U (en) * | 2015-05-18 | 2015-09-02 | 广德中鼎汽车配件有限公司 | Thin-walled square tube bracket piercing die |
| KR20170018676A (en) * | 2015-08-10 | 2017-02-20 | 주식회사 산돌기업 | Square pipe hole processing apparatus |
| CN207952353U (en) * | 2018-03-07 | 2018-10-12 | 宿迁市乐邦电子科技有限公司 | A kind of pipe fitting punch die |
-
2019
- 2019-12-02 CN CN201911213558.7A patent/CN110883199B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0647459A (en) * | 1992-07-30 | 1994-02-22 | Usui Internatl Ind Co Ltd | Punch for perforating hollow square tube and perforating method |
| CN201516463U (en) * | 2009-10-22 | 2010-06-30 | 王晓军 | Punching apparatus for pipes |
| CN202290972U (en) * | 2011-10-19 | 2012-07-04 | 李辉 | Metal pipe punching machine |
| CN204564899U (en) * | 2015-04-07 | 2015-08-19 | 罗瑞运动用品（昆山）有限公司 | A kind of bicycle front fork punch device of self-discharging |
| CN204603007U (en) * | 2015-05-18 | 2015-09-02 | 广德中鼎汽车配件有限公司 | Thin-walled square tube bracket piercing die |
| KR20170018676A (en) * | 2015-08-10 | 2017-02-20 | 주식회사 산돌기업 | Square pipe hole processing apparatus |
| CN207952353U (en) * | 2018-03-07 | 2018-10-12 | 宿迁市乐邦电子科技有限公司 | A kind of pipe fitting punch die |
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| Publication number | Publication date |
|---|---|
| CN110883199A (en) | 2020-03-17 |
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