CN109248955B - Punching and reaming integrated device and method for metal sheet - Google Patents
Punching and reaming integrated device and method for metal sheet Download PDFInfo
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- CN109248955B CN109248955B CN201710569397.XA CN201710569397A CN109248955B CN 109248955 B CN109248955 B CN 109248955B CN 201710569397 A CN201710569397 A CN 201710569397A CN 109248955 B CN109248955 B CN 109248955B
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- punching
- reaming
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- metal sheet
- punch
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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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/246—Selection of punches
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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
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
- B21D28/265—Perforating, i.e. punching holes in sheets or flat parts with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template
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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
- B21D43/003—Positioning devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a metal sheet punching and reaming integrated device and a method, wherein the device comprises an upper die holder, a lower die holder, an upper blank holder, a lower blank holder and a punching cushion block; the upper die base is arranged at the bottom of the testing machine fixing platform, and an upper blank holder is fixed at the center of the upper die base; the lower die base is arranged at the top of the testing machine moving platform, and a lower edge pressing ring is fixed at the center of the lower die base; the top of the lower edge pressing ring is provided with a punching cushion block, and the punching cushion block is provided with a die hole; the punch head comprises a lower punch head section and an upper punch head section, the lower punch head section is sleeved on the male die of the testing machine, the upper punch head section comprises a columnar punching punch head, a conical reaming punch head and a cylinder, and the columnar punching punch head or the conical reaming punch head penetrates through the lower die seat and the lower edge pressing ring and then is matched with a die hole or an upper edge pressing ring on the punching cushion block to realize punching and reaming. The invention avoids the problems of complicated test adjustment and low efficiency caused by adopting 2 sets of dies for punching and reaming in the reaming test, and accurately completes the reaming test of the metal sheet while ensuring the test efficiency.
Description
Technical Field
The invention relates to the technical field of automobile steel plate forming performance measurement, in particular to a device and a method capable of completing punching and hole expanding of a metal sheet sample at one time.
Background
The sheared or punched metal sheet is damaged and work-hardened at the cut portion, and when subjected to subsequent press forming, particularly to drawing deformation such as burring, the cut portion is cracked too early to cause breakage, which is particularly serious in the case of high-strength steel and hard aluminum alloy. The hole expansion test is a thin plate test process formed to examine the flanging performance of the plate material. During the test, the sheet is tightly pressed on the blank holder, the punched sample is pressed into the female die by the male die, so that the central hole of the sample is enlarged until the edge of the hole diameter is necked or cracked, and the test result is used for evaluating the flanging forming performance of the metal sheet.
The latest reaming test standard GB 24242452-: 2009 "method for testing thin metal sheet and thin strip by reaming" stipulates that a sample for reaming test needs to be punched first and then subjected to reaming test, so that two sets of dies, namely a punching die and a reaming die, need to be prepared by using the existing test device, and the test device needs to be readjusted when the dies are replaced, thereby resulting in complicated operation and low test efficiency.
The Chinese patents with patent numbers CN200910054902.2 and CN200420114955.1 realize the combined use of the punching and reaming die, but the die has complex structure, high manufacturing cost and troublesome operation and maintenance, and is not suitable for the transformation of the existing test device; the reaming punch adopts a cylindrical male die and is used for supporting the sheet material during punching; and in the new reaming test standard GB 2424242458-: 2009 "hole expansion test method for thin metal sheet and thin strip", it is known that a conical punch is used as the punch of the male die; therefore, there is a need to develop a punching and reaming integrated test device which can meet the latest reaming test standard, has a simple structure, and can be applied to the existing equipment.
Disclosure of Invention
The invention provides a metal sheet punching and reaming integrated device and a method, develops a metal sheet punching and reaming integrated device capable of meeting the requirements of a reaming test, avoids the problems of complicated test adjustment and low efficiency caused by adopting 2 groups of punching and reaming dies in the reaming test, and accurately completes the reaming test of a metal sheet while ensuring the test efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sheet metal punching and reaming integrated device is installed on a sheet metal forming testing machine, the testing machine is provided with a testing machine fixing platform, a testing machine moving platform, a punch and a testing machine male die, and the testing machine moving platform moves to one side of the testing machine fixing platform along a testing machine guide pillar during die assembly; the punching and reaming integrated device comprises an upper die holder, a lower die holder, an upper blank holder, a lower blank holder and a punching cushion block; the upper die base is arranged at the bottom of the testing machine fixing platform, and an upper blank holder is detachably fixed at the center of the upper die base; the lower die base is arranged at the top of the testing machine moving platform, and the lower edge pressing ring is detachably fixed at the position, corresponding to the upper edge pressing ring, of the center of the lower die base; a punching cushion block is movably arranged at the top of the lower edge pressing ring, and a corresponding die hole is formed in the punching cushion block corresponding to the punching position of the metal sheet; the punch is formed by detachably connecting a lower punch section and an upper punch section, the lower punch section is sleeved on a male die of the testing machine, the upper punch section is formed by a columnar punching punch, a conical reaming punch and a cylinder which are sequentially arranged from top to bottom, and the columnar punching punch or the conical reaming punch penetrates through the lower die seat and the lower edge pressing ring and then is matched with a die hole or an upper edge pressing ring on the punching cushion block to realize punching and reaming.
The upper die base and the lower die base are the same in size and are of rectangular plate structures, the four corners of the upper die base are respectively provided with a positioning sleeve, and the corresponding position of the lower die base is provided with a positioning guide pillar which is matched with the positioning sleeve to play a role in positioning and guiding in the punching and reaming processes.
And the upper blank holder and the upper die base, the upper die base and the testing machine fixing platform, the lower blank holder and the lower die base and the testing machine moving platform are connected by bolts.
The positioning sleeve is fixed in the upper die base through interference fit, and the positioning guide pillar is fixed in the lower die base through interference fit.
The upper blank holder and the lower blank holder are both disc-shaped structures and have the same diameter and thickness.
At least 2 locating pieces are arranged on the outer side of the lower edge pressing ring, the inner side face of each locating piece is tightly attached to the outer side face of the lower edge pressing ring, the contact face of each locating piece is an arc face matched with the appearance of the lower edge pressing ring, and the locating pieces are evenly arranged along the circumferential direction of the lower edge pressing ring.
The upper section of the punch is connected with the lower section of the punch through threads.
The punching cushion block is composed of a punching cushion block body and a handle, a clamping groove matched with the punching cushion block in shape is formed in the positioning block, and the punching cushion block is arranged in the clamping groove of the positioning block.
The punching and reaming integrated method for the metal sheet based on the device comprises the following steps:
1) placing a metal sheet sample matched with the positioning block clamping groove in shape and size on the lower blank holder and in the positioning block clamping groove, and then placing the punching cushion block on the metal sheet sample and in the positioning block clamping groove; under the limiting action of the positioning block clamping groove, the centers of the metal sheet sample and the punching cushion block are automatically aligned with the punching center;
2) starting a mold closing driving mechanism of a testing machine, driving a lower mold base to move upwards and mold an upper mold base by a testing machine moving platform, and tightly pressing a metal sheet sample between an upper edge pressing ring, a lower edge pressing ring and a punching cushion block;
3) starting a punch driving mechanism, driving a punch to move upwards at a set speed by a male die of the testing machine until the columnar punching punch penetrates through the metal sheet sample to complete punching; after punching, the male die of the testing machine and the moving platform of the testing machine return to the set position, and at the moment, the columnar punching punch part of the punch penetrates through a punched hole on the metal sheet sample to play a role in positioning;
4) taking out the punching cushion block, and starting the mold closing driving mechanism of the testing machine again to enable the metal sheet sample to be tightly pressed between the upper blank holder and the lower blank holder; starting a punch driving mechanism, enabling a punch to move upwards to ream the punched hole in the metal sheet sample by using a conical reaming punch, and stopping reaming until the edge of the hole is necked or cracked; after reaming, the male die of the testing machine and the testing machine moving platform return to the original positions;
5) taking out the punched and reamed sheet metal sample to complete one punching and reaming test process; and (5) repeating the steps 1) to 4) to finish the subsequent test process.
The thickness range of the metal sheet sample is 1.0 mm-6.0 mm; the size of the die hole on the punching cushion block conforms to the regulation of GB 242452-2009/ISO 16630:2009 thin metal plate and thin strip broaching test method.
Compared with the prior art, the invention has the beneficial effects that:
1) the metal sheet hole punching and expanding integrated device capable of meeting the requirements of the hole expanding test is developed, and the problems of complicated test adjustment and low efficiency caused by adopting 2 groups of punching and expanding dies in the hole expanding test are solved;
2) the reaming test of the metal sheet is accurately finished while the test efficiency is ensured, and the test process conforms to GB 242452-2009/ISO 16630:2009 standard requirements of thin metal plate and thin strip hole expansion test methods;
3) the device is not only suitable for new equipment, but also suitable for improving the existing test device, and has strong applicability;
4) the device has simple structure and convenient installation and operation.
Drawings
Fig. 1 is a schematic structural diagram of the metal sheet punching and reaming integrated device.
FIG. 2 is a schematic structural view of the upper die holder and the upper blank holder according to the present invention.
FIG. 3 is a schematic structural view of the lower die holder, the lower edge pressing ring and the positioning block.
Fig. 4 is a schematic view of the construction of the punch pad of the present invention.
Fig. 5 is a schematic structural view of the punch according to the present invention.
In the figure: 1. testing machine fixing platform 2, testing machine guide pillar 3, upper die holder 4, locating sleeve 5, upper blank holder 6, locating guide pillar 7, punching cushion block 7-1, punching cushion block body 7-2, handle 7-3, die hole 8, locating block 9, metal sheet sample 10, lower blank holder 11, lower die holder 12, testing machine moving platform 13, punch head 13-1, columnar punching punch head 13-2, cone reaming punch head 13-3, cylinder 13-4, punch head lower section 14, testing machine male die lower section 14
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, the punching and reaming integrated device for metal sheets is installed on a sheet forming tester, the tester is provided with a tester fixing platform 1, a tester moving platform 12, a punch 13 and a tester male die 14, and the tester moving platform 12 moves towards one side of the tester fixing platform 1 along a tester guide post 2 during die assembly; the punching and reaming integrated device comprises an upper die holder 3, a lower die holder 11, an upper blank holder 5, a lower blank holder 10 and a punching cushion block 7; as shown in fig. 2, the upper die holder 3 is installed at the bottom of the testing machine fixing platform 1, and an upper blank holder 5 is detachably fixed at the center of the upper die holder 3; as shown in fig. 3, the lower die holder 11 is installed on the top of the tester moving platform 12, and the lower edge pressing ring 10 is detachably fixed at the position of the center of the lower die holder 11 corresponding to the upper edge pressing ring 5; a punching cushion block 7 is movably placed at the top of the lower edge pressing ring 10, and a corresponding die hole 7-3 is formed in the punching cushion block 7 corresponding to the punching position of the metal sheet; the punch 13 is formed by detachably connecting a lower punch section 13-4 and an upper punch section, the lower punch section 13-4 is sleeved on a male die 14 of the testing machine, the upper punch section is formed by a columnar punch 13-1, a conical reaming punch 13-2 and a cylinder 13-3 which are sequentially arranged from top to bottom, and the columnar punch 13-1 or the conical reaming punch 13-2 is matched with a die hole 7-3 or an upper blank holder 5 on the punching cushion block 7 to realize punching and reaming after penetrating through the lower die holder 11 and the lower blank holder 10.
The upper die base 3 and the lower die base 11 are the same in size and are of rectangular plate structures, the four corners of the upper die base 3 are respectively provided with a positioning sleeve 4, and the corresponding position of the lower die base 11 is provided with a positioning guide pillar 6 which is matched with the positioning sleeve 4 to play a positioning and guiding role in the punching and reaming processes.
And the upper blank holder 5 and the upper die base 3, the upper die base 3 and the testing machine fixing platform 1, the lower blank holder 10 and the lower die base 11 and the testing machine moving platform 12 are connected by bolts.
The positioning sleeve 4 is fixed in the upper die holder 3 through interference fit, and the positioning guide pillar 6 is fixed in the lower die holder 11 through interference fit.
The upper blank holder 5 and the lower blank holder 10 are both disc-shaped structures and have the same diameter and thickness.
As shown in fig. 3, at least 2 positioning blocks 8 are arranged on the outer side of the lower edge pressing ring 10, the inner side of each positioning block 8 is tightly attached to the outer side of the lower edge pressing ring 10, the contact surface is an arc surface matched with the outer shape of the lower edge pressing ring 10, and the positioning blocks 8 are uniformly arranged along the circumferential direction of the lower edge pressing ring 10.
As shown in fig. 5, the upper and lower sections 13-4 are connected by a screw thread.
As shown in fig. 4, the punching pad 7 is composed of a punching pad body 7-1 and a handle 7-2, a clamping groove matched with the punching pad 7 in shape is formed on the positioning block 8, and the punching pad 7 is arranged in the clamping groove of the positioning block.
The punching and reaming integrated method for the metal sheet based on the device comprises the following steps:
1) placing a metal sheet sample 9 matched with the positioning block clamping groove in shape and size on the lower blank holder 10 and in the positioning block clamping groove, and then placing the punching cushion block 7 on the metal sheet sample 9 and in the positioning block clamping groove; under the limiting action of the positioning block clamping groove, the centers of the metal sheet sample 9 and the punching cushion block 7 are automatically aligned with the punching center;
2) starting a mold closing driving mechanism of a testing machine, driving a lower mold base 11 to move upwards to close the upper mold base 3 by a testing machine moving platform 12, and tightly pressing a metal sheet sample 9 between an upper edge pressing ring 5, a lower edge pressing ring 10 and a punching cushion block 7;
3) starting a punch driving mechanism, and driving a punch 13 to move upwards at a set speed by a male die 14 of the testing machine until a columnar punching punch 13-1 penetrates through a metal sheet sample 9 to complete punching; after punching, the male die 14 of the testing machine and the moving platform 12 of the testing machine return to the set position, and at the moment, the columnar punching punch 13-1 part of the punch 13 penetrates through a punched hole on the sheet metal sample 9 to play a positioning role;
4) taking out the punching cushion block 7, and starting the mold closing driving mechanism of the testing machine again to enable the metal sheet sample 9 to be tightly pressed between the upper blank holder 5 and the lower blank holder 10; starting a punch driving mechanism, enabling a punch 13 to move upwards, and carrying out hole expanding on a punched hole on the metal sheet sample 9 by using a conical hole expanding punch 13-2 until the hole edge is necked or cracked; after reaming, the male die 14 of the testing machine and the moving platform 12 of the testing machine return to the original positions;
5) taking out the punched and reamed sheet metal sample 9 to complete the punching and reaming test process; and (5) repeating the steps 1) to 4) to finish the subsequent test process.
The thickness range of the metal sheet sample 9 is 1.0 mm-6.0 mm; the size of the die hole 7-3 on the punching cushion block 7 conforms to the regulation of GB 24242454-.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A punching and reaming integrated method for a metal sheet is realized based on a punching and reaming integrated device for the metal sheet; the hole punching and expanding integrated device is installed on a plate forming testing machine, the testing machine is provided with a testing machine fixing platform, a testing machine moving platform, a punch and a testing machine male die, and the testing machine moving platform moves to one side of the testing machine fixing platform along a testing machine guide pillar during die assembly; the punching and reaming integrated device is characterized by comprising an upper die holder, a lower die holder, an upper blank holder, a lower blank holder and a punching cushion block; the upper die base is arranged at the bottom of the testing machine fixing platform, and an upper blank holder is detachably fixed at the center of the upper die base; the lower die base is arranged at the top of the testing machine moving platform, and the lower edge pressing ring is detachably fixed at the position, corresponding to the upper edge pressing ring, of the center of the lower die base; a punching cushion block is movably arranged at the top of the lower edge pressing ring, and a corresponding die hole is formed in the punching cushion block corresponding to the punching position of the metal sheet; the punch is formed by detachably connecting a lower punch section and an upper punch section, the lower punch section is sleeved on the male die of the testing machine, the upper punch section consists of a columnar punching punch, a conical reaming punch and a cylinder which are sequentially arranged from top to bottom, and the columnar punching punch or the conical reaming punch penetrates through the lower die seat and the lower edge pressing ring and then is matched with a die hole or an upper edge pressing ring on the punching cushion block to realize punching and reaming;
an integrated method for punching and expanding a hole on a metal sheet comprises the following steps:
1) placing a metal sheet sample matched with the positioning block clamping groove in shape and size on the lower blank holder and in the positioning block clamping groove, and then placing the punching cushion block on the metal sheet sample and in the positioning block clamping groove; under the limiting action of the positioning block clamping groove, the centers of the metal sheet sample and the punching cushion block are automatically aligned with the punching center;
2) starting a mold closing driving mechanism of a testing machine, driving a lower mold base to move upwards and mold an upper mold base by a testing machine moving platform, and tightly pressing a metal sheet sample between an upper edge pressing ring, a lower edge pressing ring and a punching cushion block;
3) starting a punch driving mechanism, driving a punch to move upwards at a set speed by a male die of the testing machine until the columnar punching punch penetrates through the metal sheet sample to complete punching; after punching, the male die of the testing machine and the moving platform of the testing machine return to the set position, and at the moment, the columnar punching punch part of the punch penetrates through a punched hole on the metal sheet sample to play a role in positioning;
4) taking out the punching cushion block, and starting the mold closing driving mechanism of the testing machine again to enable the metal sheet sample to be tightly pressed between the upper blank holder and the lower blank holder; starting a punch driving mechanism, enabling a punch to move upwards to ream the punched hole in the metal sheet sample by using a conical reaming punch, and stopping reaming until the edge of the hole is necked or cracked; after reaming, the male die of the testing machine and the testing machine moving platform return to the original positions;
5) taking out the punched and reamed sheet metal sample to complete one punching and reaming test process; and (5) repeating the steps 1) to 4) to finish the subsequent test process.
2. The integrated method for punching and reaming a hole in a metal sheet according to claim 1, wherein the upper die holder and the lower die holder have the same size and are both rectangular plate-shaped structures, positioning sleeves are respectively arranged at four corners of the upper die holder, and positioning guide pillars are arranged at corresponding positions of the lower die holder and are matched with the positioning sleeves to play a role in positioning and guiding in the punching and reaming processes.
3. The metal sheet punching and reaming integrated method according to claim 1, wherein the upper blank holder and the upper die base, the upper die base and the testing machine fixing platform, the lower blank holder and the lower die base, and the lower die base and the testing machine moving platform are connected through bolts.
4. The integrated method for punching and reaming a metal sheet according to claim 2, wherein the positioning sleeve is fixed in the upper die holder by interference fit, and the positioning guide pillar is fixed in the lower die holder by interference fit.
5. The integrated method for punching and reaming a metal sheet according to claim 1, wherein the upper and lower pressing rims are disc-shaped and have the same diameter and thickness.
6. The integrated method for punching and reaming a hole in a metal sheet according to claim 1, wherein at least 2 positioning blocks are arranged on the outer side of the lower edge pressing ring, the inner side surface of each positioning block is tightly attached to the outer side surface of the lower edge pressing ring, the contact surface is an arc surface matched with the shape of the lower edge pressing ring, and the positioning blocks are uniformly arranged along the circumferential direction of the lower edge pressing ring.
7. The integrated method for punching and reaming a metal sheet according to claim 1, wherein the upper punch segment and the lower punch segment are connected by threads.
8. The integrated method of claim 1, wherein the punching pad comprises a body and a handle, the positioning block has a slot matching the shape of the punching pad, and the punching pad is disposed in the slot of the positioning block.
9. The integrated method for punching and reaming a metal sheet according to claim 1, wherein the thickness of the metal sheet sample ranges from 1.0mm to 6.0 mm; the size of the die hole on the punching cushion block conforms to the regulation of GB 24242458-.
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| CN201710569397.XA CN109248955B (en) | 2017-07-13 | 2017-07-13 | Punching and reaming integrated device and method for metal sheet |
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| CN201710569397.XA CN109248955B (en) | 2017-07-13 | 2017-07-13 | Punching and reaming integrated device and method for metal sheet |
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| CN109248955A CN109248955A (en) | 2019-01-22 |
| CN109248955B true CN109248955B (en) | 2020-09-01 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111659794B (en) * | 2019-03-08 | 2022-04-12 | 台州市百达电器有限公司 | Magnetic pole punching small hole die |
| CN110631907B (en) * | 2019-09-17 | 2021-12-14 | 武汉钢铁有限公司 | Preparation method of standard sample for verifying uniformity of steel for reaming and use performance of punching and reaming device |
| CN110523825A (en) * | 2019-09-20 | 2019-12-03 | 广州鑫娄山模具有限公司 | Tester for reaming |
| CN112296189A (en) * | 2020-09-24 | 2021-02-02 | 安徽飞翔电器有限公司 | One-step forming die for motor punching reaming and excircle mark groove |
| CN112621135A (en) * | 2020-12-23 | 2021-04-09 | 河北亿利康纳利亚环保科技有限公司 | Post-treatment non-guide die carrier packaging process |
| CN113063650B (en) * | 2021-03-16 | 2023-02-28 | 天津市新天钢钢铁集团有限公司 | Steel plate hole expanding test method under temperature condition of 20-40 DEG C |
| CN113618017B (en) * | 2021-08-09 | 2022-07-01 | 哈尔滨工业大学 | Blank making method for cutting and expanding integrated control of metal streamline distribution of roller bearing ring |
| CN117705540B (en) * | 2024-02-04 | 2024-05-03 | 包头市科锐微磁新材料有限责任公司 | Isotropic neodymium iron boron rapid quenching magnetic powder sample preparation device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101290280B (en) * | 2008-06-05 | 2011-01-12 | 北京航空航天大学 | Tepid environment universal sheet shaping test machine |
| CN201397274Y (en) * | 2009-04-16 | 2010-02-03 | 宝山钢铁股份有限公司 | Deep-drawing mould for evaluating forming performance of metal thin plate |
| CN201537655U (en) * | 2009-10-15 | 2010-08-04 | 宝山钢铁股份有限公司 | Metal plate punching device |
| JP5170146B2 (en) * | 2010-03-30 | 2013-03-27 | 新日鐵住金株式会社 | Hole expansion test method for metal materials |
| CN204770141U (en) * | 2015-06-26 | 2015-11-18 | 鞍钢股份有限公司 | Car sheet metal punching device for hole expansion test |
| CN206311416U (en) * | 2016-11-30 | 2017-07-07 | 武汉钢铁股份有限公司 | The mould that a kind of multi-functional reaming sample is prepared and tested |
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