KR101748300B1 - Punching apparatus for hole expansion test - Google Patents

Punching apparatus for hole expansion test Download PDF

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Publication number
KR101748300B1
KR101748300B1 KR1020150156468A KR20150156468A KR101748300B1 KR 101748300 B1 KR101748300 B1 KR 101748300B1 KR 1020150156468 A KR1020150156468 A KR 1020150156468A KR 20150156468 A KR20150156468 A KR 20150156468A KR 101748300 B1 KR101748300 B1 KR 101748300B1
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KR
South Korea
Prior art keywords
main unit
unit
punching
lower main
flange portion
Prior art date
Application number
KR1020150156468A
Other languages
Korean (ko)
Other versions
KR20170054602A (en
Inventor
김정철
이현영
Original Assignee
주식회사 포스코
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Priority to KR1020150156468A priority Critical patent/KR101748300B1/en
Publication of KR20170054602A publication Critical patent/KR20170054602A/en
Application granted granted Critical
Publication of KR101748300B1 publication Critical patent/KR101748300B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • 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
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means
    • G01L5/0038—Force sensors associated with force applying means applying a pushing force
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/28—Investigating ductility, e.g. suitability of sheet metal for deep-drawing or spinning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0064—Initiation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/027—Specimens with holes or notches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing means

Abstract

A punching device for hole extension test is disclosed. According to the punching apparatus for hole expansion test according to the embodiment of the present invention, the punching device for the hole extension test includes a lower main unit, an upper main unit positioned above the lower main unit, a flange portion received to be movable up and down, And a punch unit detachably coupled to the lower main unit and the upper main unit, for punching a material interposed between the lower main unit and the upper main unit. Therefore, it is possible to change punches of various shapes when necessary, and it is possible to easily control the punching load applied to the material according to the strength and thickness of the material by using the load cell and the pressure cell, One material can be calibrated to obtain various holes of uniform quality.

Description

[0001] PUNCHING APPARATUS FOR HOLE EXPANSION TEST [0002]

The present invention relates to a punching apparatus for hole expansion test, and it is possible to exchange punches of various shapes, and it is possible to easily control the punching load applied to the material according to the strength and thickness of the material, The present invention relates to a punching apparatus for a hole expansion test capable of obtaining various holes of high quality.

In general, the Hole Expansion Ratio (HER) of a plate material is a material characteristic of how much hole can be expanded without any defects such as cracks or neckings in the plate material through various processing methods. When a product having a flange portion or burring portion is formed, cracks or necking easily occur at the edge of the flange portion or the burring portion. The degree of occurrence of cracks or necking of the edge portion is greatly dependent on the surface condition of the edge portion .

A typical example of the experiment that can reflect the deformation pattern during processing of the flange portion or the burring portion while considering the surface condition of the edge is a hole expansion test in which the test is performed as shown in FIGS.

1 to 3, description will be made of the hole expanding test. A pressing force is applied to prevent the material 12 from flowing between the upper mold 10 and the lower mold 11, and then the burring punch 13 The material is stretched while forming the flange 12a around the hole as shown in FIG. 3, and when the burring limit of the material is reached, the material of the edge portion of the hole is broken 12b, The hole diameter of the material is evaluated by the maximum diameter.

At this time, the shape of the burring punch 13 may be various types such as conical shapes, hemispherical shapes, and cylindrical shapes at various angles in order to perform experiments under various deformation conditions.

This hole expansion test is greatly influenced by the initial hole machining conditions and the extensibility. In a conventional punching apparatus, a punching die is placed on a die holder, a workpiece 12 is placed on the punching die, and then a punching operation is performed by inserting the punch into the punching die. The above hole machining conditions include a gap between the punch and the punching die, a shape of the punch end, and a pressing condition on the material.

The test specimens for the hole expansion test are required to control the punching load applied to the material according to the strength and thickness of the material to which various strength, thickness and the like are applied, and it is necessary to exchange punches of various shapes. However, according to the conventional spring-type fixed pressing method, the punch is fixed and it is difficult to replace the punch. Therefore, there is a problem that a constant load is applied to the material or a pressing load is hardly deformed according to the strength of the material.

In order to facilitate the production and transportation of steel materials, many products are produced in the form of a coil. Therefore, in the case of a conventional punching apparatus, in the case of a material having a non-uniform shape such as a bent material, There is a disadvantage that the contact of the material is not uniform and the burr state of the surface is not uniform. In addition, even if the punching method in which the spring is lowered at the same time when the punch side descends and the material 12 is pressed, there is a problem that it is difficult to deform the pressing load at the time of punching, and it is difficult to measure the punching load.

Korean Patent Publication No. 10-2014-0127011

Embodiments of the present invention are capable of replacing punches of various shapes, and it is easy to control the punching load applied to the material according to the strength and thickness of the material, and it is possible to correct various non- To provide a punching device for hole extension test.

The punching device for hole expansion test according to an embodiment of the present invention includes a lower main unit, an upper main unit positioned above the lower main unit, a flange portion received to be movable up and down on the lower main unit, And a punch for punching a material interposed between the lower main unit and the upper main unit.

According to an embodiment of the present invention, the lower main unit and the upper main unit are integrally provided, the press main body provided at the lower portion of the lower main unit, And an inner cylinder accommodated in the outer cylinder so as to be able to move up and down with respect to the outer cylinder.

According to an embodiment of the present invention, a load cell for measuring a load applied to the inner cylinder and a pressure cell for measuring pressure may be disposed under the inner cylinder.

According to an embodiment of the present invention, when the outer cylinder is lifted, the lower main unit and the flange portion are raised at the same time, and the flange portion can be lifted when the inner cylinder is lifted.

According to an embodiment of the present invention, the flange portion includes a flange received in the lower main unit and a moving sleeve engaged with the flange, and the punch portion may be detachably coupled to the moving sleeve.

Also, according to an embodiment of the present invention, the punch portion may be coupled and separated from the moving sleeve by a bolt.

According to an embodiment of the present invention, a lower fixing unit may be disposed on the lower main unit to guide upward and downward movement of the flange portion.

In addition, according to an embodiment of the present invention, it may include a pressing unit positioned on the lower fixed unit and having an upper surface in a plane.

According to an embodiment of the present invention, there is provided a punching die, comprising: a die holder located at a lower portion of the upper main unit; and a punching die detachably coupled to the die holder, Can be formed.

According to an embodiment of the present invention, the apparatus may further include a support unit including a plurality of elastic members disposed between the lower main unit and the upper main unit, wherein the lower main unit is movable up and down .

The punching apparatus for hole expansion test according to the embodiments of the present invention is configured such that punches are detachably coupled so that punches of various shapes can be exchanged when necessary. By using a load cell and a pressure cell, It is easy to control the applied punching load and various holes of uniform quality can be obtained by calibrating a material having a non-uniform shape.

Figs. 1 and 2 are sectional views for explaining a hole expansion test method. Fig.
3 is a perspective view showing the resultant specimen according to the hole expansion test.
4 is a cross-sectional view for explaining a punching apparatus for hole expansion test according to an embodiment of the present invention.
5 to 8 are sectional views for explaining a punch according to embodiments of the present invention.
9 is a perspective view illustrating a hydraulic press according to an embodiment of the present invention.
10 to 12 are sectional views for explaining a method of operating a punching apparatus for hole expansion test according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

4 is a cross-sectional view for explaining a punching apparatus for hole expansion test according to an embodiment of the present invention.

Referring to FIG. 4, a punching apparatus for hole expansion test according to an embodiment of the present invention includes a punch unit 20, an upper unit 40, a lower unit 50, and a flange unit 60.

The lower unit 50 includes a lower main unit 51, a lower fixing unit 52, a first pressing unit 53, and a fixing sleeve 54.

The lower main unit 51 is provided in a plate shape. The lower main unit 51 is spaced apart from the flange portion 60 so that the flange portion 60 can move up and down between the lower main unit 51 and the flange portion 60 A predetermined space can be formed.

The lower fixing unit 52 may be positioned on the lower main unit 51 and fixed to the first lower bolt LB1.

The first pressing unit 53 may be positioned on the lower fixing unit 52 and fixed to the second lower bolt LB2 and the upper surface of the first pressing unit 53 may be provided in a plane . Therefore, the first pressing unit 53 and the lower end surface of the upper unit 40 are brought into contact with each other on the upper and lower surfaces of the workpiece so that the shape of the workpieces having a nonuniform shape is constant, that is, can do.

The fixing sleeve 54 is accommodated in the lower fixing unit 52 and can guide the flange portion 60 up and down by surrounding one side of the flange portion 60.

Further, the lower fixing unit 52 is spaced apart from the flange portion 60 and provides a predetermined space so that the flange portion 60 can be elevated. The lower fixing unit 52 and the flange portion 60 may be fixed to the third lower bolt LB3. The third lower bolt LB3 may include a first elastic member 63 to lower the flange portion 60 after the flange portion 60 is lifted. The first elastic member 63 may be a compression coil spring, and the flange portion 60 may be lifted and the compressed compression coil spring may expand due to elasticity to lower the flange portion 60.

The upper main unit 41 is located above the lower main unit 51. The upper unit 40 includes an upper main unit 41, a second pressing unit 42, an upper fixing unit 43, and a die holder 44.

The upper main unit 41 is provided in a plate shape.

On the upper main unit 41, a second pressurizing unit 42 for transmitting pressure transmitted from the upper portion is provided. The second pressurizing unit 42 may be fixed by the upper main unit 41 and the first upper bolt UB1. The second pressing unit 42 includes a feed groove 42a which can move the upper unit 40 and the lower unit 50 formed integrally with each other, For example, a moving bolt such as a crane.

The upper fixing unit 43 is provided for fixing the die holder 44 to the lower portion of the upper main unit 41 and fixed to the upper main unit 41 and the second upper bolt UB2. have.

The die holder 44 can be fixed by the upper fixing unit 43 and the third upper bolt UB3 and has grooves for accommodating punching dies 21 of various widths and shapes, A set screw 44a fixed from one side of the holder 44 and capable of fixing the punching die 21 by adjusting the width or the like of the groove of the die holder 44 is provided.

The flange portion (60) is received in the lower main unit (51) so as to be movable up and down.

For example, the flange portion 60 is spaced apart from the lower main unit 51, and the flange portion 60 is raised and lowered between the flange portion 60 and the lower main unit 51, A predetermined space can be formed so as to allow downward movement.

For example, the flange portion 60 includes a flange 61 accommodated in the lower main unit 51 and a moving sleeve 62 fastened to the flange 61.

The punching unit 20 punches a material interposed between the lower main unit 51 and the upper main unit 41.

The punch portion 20 is detachably coupled to the flange portion 60. More specifically, the punch 20 may be removably coupled to the moving sleeve 62.

For example, the punch 20 can be coupled and separated by the moving sleeve 62 and the fixing bolt 62a. The fixing bolt 62a is fixed to the lower end of the moving sleeve 62 and a nut groove for male and female engaging with the fixing bolt 62 may be formed in the punch 20. [

The upper surface of the punch 20 may have various shapes. 5 to 8 are sectional views for explaining a punch according to embodiments of the present invention. 5 to 8, punches of various shapes can be manufactured and applied to the punch 20. For example, the punches according to the embodiments of FIGS. 5 and 6 are provided in a plane to uniformly contact one surface contacting the workpiece, and when the holes to be formed have different sizes, Can be applied. Alternatively, the punch according to the embodiment of FIG. 7 may be provided at one end in a tapered shape. Alternatively, the punch according to the embodiment of FIG. 8 may be formed in a shape in which the inclined surface is formed so that the width of the punch increases from one surface contacting the material to the other surface.

The punching die 21 is accommodated in a groove provided in the die holder 44 of the upper unit 40. The punching die 21 may be detachably coupled to the die holder 44, which may be fixed by the set screw 44a.

The punching die 21 may have a hole H corresponding to an upper surface of the punching unit 20. This is because the material is punched out by the punching portion 2 to form a hole and the remaining punching piece can be received, which can be easily extracted into the hole formed through the upper portion of the punching die 21.

The punching device includes a support unit which is movable up and down of the lower main unit 51. The support unit includes a guide post 45 passing through the lower main unit 51 and the upper main unit 41 and a guide post 45 fixed to the side of the upper main unit 41 for fixing the guide post 45 And a guide bush 48 for guiding the up and down movement of the guide post 45 and the second elastic member 47. The guide bush 46 includes a first bushing 46, a second bushing 47 surrounding a part of the guide post, . For example, the second elastic member 47 may be a compression coil spring.

9 is a perspective view illustrating a hydraulic press according to an embodiment of the present invention. 10 to 12 are sectional views for explaining a method of operating a punching apparatus for hole expansion test according to an embodiment of the present invention.

9 to 12, a punching apparatus for a hole expansion test according to an embodiment of the present invention includes a hydraulic press 70, and the lower unit 50 and the upper unit 40 are integrally provided, Can be accommodated in a hydraulic press (70).

The hydraulic press 70 includes a lower plate 71, an upper plate 72 positioned above the lower plate 71, a support 73 forming a space between the lower plate 71 and the upper plate 72, A press main body 74 disposed on the lower plate 71, an outer cylinder 75 accommodated in the press main body 74 so as to be movable up and down, A pressure plate 77 fixed to the lower surface of the upper plate 72 to apply pressure to the lower surface of the upper unit 40 in contact with the second pressure unit 42, A load cell 78 disposed at a lower portion of the inner cylinder 76 for measuring a load applied to the inner cylinder 76 and a pressure sensor 76 disposed at a lower portion of the inner cylinder 76 for measuring a pressure applied to the inner cylinder 76 Cell < / RTI >

The lower main unit 51 and the flange portion 60 are disposed on the outer cylinder 75 so that the lower main unit 51 and the flange portion 60 Can be raised at the same time. Only the flange portion 60 is disposed on the inner cylinder 76 so that the lower main unit 51 is fixed when the inner cylinder 76 rises and only the flange portion 60 can be raised.

That is, after interposing a material to be punched between the lower unit 50 and the upper unit 40 housed in the hydraulic press 70, the outer cylinder 71 is lifted, The material between the punching die 53 and the punching die 21 can be pressurized, and the pressure at this time can be controlled through the control of the valve.

Thereafter, when the inner cylinder 72 of the hydraulic press 70 is raised, the flange portion 60 is lifted. At this time, the punch portion 20 coupled to the flange portion 60 is lifted, And the punching load and the pressure at this time can be measured through the load cell 78 and the pressure cell 79 disposed under the inner cylinder 72. [

When the punching is completed, the inner cylinder 72 is lowered, and the elasticity of the first elastic member 63 located between the flange 61 of the flange portion 60 and the lower fixed unit 52 The flange portion 60 is lowered in accordance with the guide of the outer surface of the moving sleeve 62 and the inner surface of the fixing sleeve 54 .

The outer cylinder 71 of the hydraulic press 70 is lowered and expanded by the elasticity of the second elastic member 47 surrounding the outer surface of the guide post 45 so that the lower unit 50 The lower unit 50 and the upper unit 40 are separated from each other, so that the punching completed specimen can be obtained. On the other hand, the inner punching piece having completed the punching can be easily extracted through the hole formed through the upper portion of the punching die 21.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited thereto. Those skilled in the art will readily obviate modifications and variations within the spirit and scope of the appended claims. It will be understood that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

10, 11: upper / lower mold 12: material
13: burring punch 20: punch portion
21: punching die 40: upper unit
41: upper main unit 42: second pressure unit
43: upper fixing unit 44: die holder
45: guide post 46: stationary bush
47: second elastic member 48: guide bush
50: lower unit 51: lower main unit
52: lower fixing unit 53: first pressing unit
54: fixing sleeve 60: flange portion
61: flange 62: moving sleeve
63: first elastic member 70: hydraulic press

Claims (10)

A lower main unit;
An upper main unit positioned above the lower main unit;
A flange portion received in the lower main unit so as to be movable up and down;
A punch part detachably coupled to the flange part and punching a material interposed between the lower main unit and the upper main unit; And
A hydraulic press including a press main body provided at a lower portion of the lower main unit, an outer cylinder accommodated in the press main body so as to be movable up and down, and an inner cylinder accommodated in the outer cylinder so as to be movable up and down In addition,
Wherein the lower main unit and the flange portion are supported on the outer cylinder and the flange portion is disposed and supported on the inner cylinder so that the lower main unit and the flange portion are raised at the same time when the outer cylinder is lifted, Wherein the flange portion is raised when the cylinder rises,
Punching device for hole extension test. The method according to claim 1,
Wherein the lower main unit and the upper main unit are integrally provided. The method according to claim 1,
Wherein a load cell for measuring a load applied to the inner cylinder and a pressure cell for measuring a pressure are disposed under the inner cylinder. delete The method according to claim 1,
Wherein the flange portion includes a flange accommodated in the lower main unit and a moving sleeve engaged with the flange,
Wherein the punch portion is removably coupled to the moving sleeve. 6. The punching apparatus according to claim 5, wherein the punching portion is engaged with and separated from the moving sleeve by a bolt. 6. The method of claim 5,
And a lower fixing unit positioned on the lower main unit and guiding the upward and downward movement of the flange portion. 8. The method of claim 7,
And a pressing unit located on the lower fixed unit and having an upper surface provided in a plane. The method according to claim 1,
A die holder positioned below the upper main unit, and a punching die detachably coupled to the die holder,
Wherein the punching die has a hole corresponding to an upper surface of the punching portion. The method according to claim 1,
Further comprising a support unit including a plurality of elastic members disposed between the lower main unit and the upper main unit, the support unit being movable upward and downward of the lower main unit.


KR1020150156468A 2015-11-09 2015-11-09 Punching apparatus for hole expansion test KR101748300B1 (en)

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KR101748300B1 true KR101748300B1 (en) 2017-06-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102237767B1 (en) * 2019-11-12 2021-04-09 태림산업(주) Method for forging sleeve yoke using the press machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109530535A (en) * 2018-12-28 2019-03-29 东莞市豪斯特热冲压技术有限公司 A kind of mold and method for hot-formed product pre-punched hole
CN110523825A (en) * 2019-09-20 2019-12-03 广州鑫娄山模具有限公司 Tester for reaming

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005040838A (en) 2003-07-24 2005-02-17 Hideo Hoshi Apparatus for working cylinder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005040838A (en) 2003-07-24 2005-02-17 Hideo Hoshi Apparatus for working cylinder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
논문2013

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102237767B1 (en) * 2019-11-12 2021-04-09 태림산업(주) Method for forging sleeve yoke using the press machine

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