KR960004812Y1 - Bending tester - Google Patents

Bending tester Download PDF

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KR960004812Y1
KR960004812Y1 KR2019930018489U KR930018489U KR960004812Y1 KR 960004812 Y1 KR960004812 Y1 KR 960004812Y1 KR 2019930018489 U KR2019930018489 U KR 2019930018489U KR 930018489 U KR930018489 U KR 930018489U KR 960004812 Y1 KR960004812 Y1 KR 960004812Y1
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die
specimen
steel sheet
bending
lower die
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KR2019930018489U
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KR950009567U (en
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전선호
김오태
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포항종합제철 주식회사
조말수
재단법인 산업과학기술연구소
백덕현
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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
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces

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  • Health & Medical Sciences (AREA)
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Abstract

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Description

표면처리강판용 굽힘시험장치Bending Tester for Surface Treated Steel Sheet

제1도는 종래의 굽힘시험장치에 의한 굽힘시험의 개략도로서,1 is a schematic diagram of a bending test by a conventional bending test apparatus,

1a도는 시편이 V자형으로 굴곡되는 것을 나타낸 단면도.1a is a cross-sectional view showing that the specimen is bent in a V-shape.

1b도는 V자형으로 굴곡된 시편에 삽입시험편을 삽입하여 굽히는 것을 나타낸 단면도.Figure 1b is a cross-sectional view showing the insertion of the insertion test specimen bent in the V-shaped bent specimen.

제2도는 본 고안의 굽힘시험장치의 개략사시도.2 is a schematic perspective view of the bending test apparatus of the present invention.

제3도는 본 고안의 굽힘시험장치의 사용예시도.3 is a view illustrating the use of the bending test apparatus of the present invention.

제4도는 본 고안의 굽힘시험장치를 구성하는 부품을 나타낸 것으로,Figure 4 shows the components constituting the bending test apparatus of the present invention,

4a도는 상부다이의 사시도.4a is a perspective view of the upper die.

4b도는 편쳐의 사시도.4b is a perspective view of the knitting.

4c도는 하부다이의 사시도.4c is a perspective view of the lower die.

4d도는 하부평판의 사시도.4d is a perspective view of the lower plate.

4e도는 상부평판의 사시도.4e is a perspective view of the upper plate.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

2, 12 : 상부평판 3, 13 : 펀쳐(Puncher)2, 12: upper flat plate 3, 13: puncher

10, 19 : 요홈 4, 14 : 하부다이(Die)10, 19: groove 4, 14: lower die (Die)

5, 15 : 하부평판 7, 17, 17a : 시편5, 15: lower plate 7, 17, 17a: specimen

11 : 상부다이(Die) 16, 20 : 고정볼트11: upper die 16, 20: fixing bolt

6, 26 : 삽입시험편 A : 상부프레임부부6, 26: Insertion Test Specimen A: Upper Frame Part

B : 하부프레임 L : 내측간극B: Lower frame L: Inner clearance

본 고안은 용융아연도금강판, 용융아연열연강판, 합금화 용융아연도금강판, 전기도금강판 및 도장강판등 각종 표면처리강판의 굽힘시험장치에 관한 것이다.The present invention relates to a bending test apparatus for various surface treated steel sheets such as hot dip galvanized steel sheet, hot dip galvanized steel sheet, alloyed hot dip galvanized steel sheet, electroplated steel sheet and coated steel sheet.

표면처리강판은 표면이 미려하고 내식성이 우수하기 때문에 건자재용, 가전용, 자동차용 강판으로 폭넓게 사용되며, 필수적으로 굽힘가공을 받게 된다. 이때 표면처리강판의 도금밀착성이나 도막밀착성이 열화되면 굽힘가공부에서 도금박리나 도장박리가 발생하여 표면외관 및 내식성저하는 초래한다. 따라서 각종 도금 및 도장간판의 도금 및 도막밀착성 평가는 표면처리강판의 품질특성 평가의 필수항목이다.Surface-treated steel sheet is widely used as a steel plate for building materials, home appliances, and automobiles because of its beautiful surface and excellent corrosion resistance, and is essentially subjected to bending processing. At this time, if the plating adhesion or the coating film adhesion of the surface-treated steel sheet is degraded, plating peeling or coating peeling occurs in the bending processing portion, resulting in deterioration of surface appearance and corrosion resistance. Therefore, the evaluation of plating and coating film adhesion of various plating and coating plates is an essential item in evaluating the quality characteristics of surface treated steel sheets.

이러한 표면처리강판의 도금박리 및 도막박리를 평가하기 위한 방법으로 록포밍(Lock forming), 에릭센(Erichsem), 굽힘(Bending) 시험등이 통상적으로 사용되고 있으며 이 중에서 록포밍과 에릭센시험은 각각 소재두께의 제한이나 평가항목의 제한등의 단점이 있는 반면에 굽힘시험은 평가항목이 다양하고 소재두께의 제한이 없어 상용되고 있다.As a method for evaluating the plating peeling and coating peeling of the surface-treated steel sheet, lock forming, ericsen, and bending tests are commonly used. On the other hand, there are disadvantages such as the limitation of the material thickness and the limitation of the evaluation item. On the other hand, the bending test is widely used because there are various evaluation items and there is no limitation of the material thickness.

표면처리강판의 굽힘시험에 대한 각종 공업규격에 의하면 소재종류, 소재의 두께, 도금 및 도장부착량, 사용목적에 따라 평가방법이 다르다.According to various industrial standards for the bending test of surface-treated steel sheets, evaluation methods differ depending on the type of material, the thickness of the material, the amount of plating and coating, and the intended use.

일반적으로 표면처리강판은 소재의 두께와 도금 및 도장부착량이 두꺼울수록 곡율의 내측간극(L)을 크게 한다. 즉 굽힘시험에 사용되는 동일한 시험편을 굽힘곡률의 내측간극(L)에 규정된 수만큼 삽입한 후 완전히 밀착시키게 된다. 이때 굽힘 내측간극(L)에 삽입되는 동일 시험편의 갯수에 따라 OT(내측간극에 삽입시험편이 전혀 삽입되지 않은 경우)에서 3T(내측간극에 삽입시험편이 3개 삽입한 경우)까지 세분화하여 평가하고 있다.In general, the surface-treated steel sheet increases the inner gap L of the curvature as the thickness of the material and the coating and coating amount are increased. That is, the same test piece used in the bending test is inserted into the gap (L) of the bending curvature, and then completely adhered. At this time, according to the number of the same test piece inserted into the bending inner gap (L), the OT (when no insertion test piece is inserted into the inner gap at all) from 3T (when three inserted test pieces are inserted into the inner gap) and evaluated have.

표면처리강판의 도금밀착성 및 도막밀착성을 평가하기 위한 종래의 굽힘시험장치는 제1a도에 나타낸 바와 같이, 우선 시편(7)을 양쪽 하부다이(4)에 올려놓은 후 시편(7)의 중앙부에 펀쳐(3)를 밀착시키고 서서히 펀쳐(3)에 하중을 가하여 시편(7)을 V자형으로 굽힌다. 그 다음 제1b도에 나타낸 것처럼 굽힘시험장치의 상·하부 프레임을 평판(2, 5)으로 교체한 후 V자형으로 구부러진 시편의 내측에 적정갯수의 삽입시험편(6)을 상비하야 시편(7)을 하부평판(5)의 상부에 수평으로 눕힌 후 시편(7)의 내측면에 삽입시험편(6)과 밀착되도록 상부 프레임에 하중을 가하여 U자형으로 시편(7)을 굽힘 가공한다.In the conventional bending test apparatus for evaluating the plating adhesion and the film adhesion of the surface-treated steel sheet, as shown in FIG. 1A, first, the specimen 7 is placed on both lower dies 4, and then the center portion of the specimen 7 The puncher 3 is brought into close contact with each other, and the puncher 3 is gradually loaded to bend the specimen 7 in a V shape. Then, as shown in FIG. 1B, after replacing the upper and lower frames of the bending test apparatus with the flat plates (2, 5), an appropriate number of insertion specimens (6) should be placed inside the V-shaped bent specimens (7) Lay horizontally on the upper part of the lower plate 5, and apply a load to the upper frame so as to be in close contact with the insertion test piece 6 on the inner surface of the test piece (7) and bend the test piece (7) in a U shape.

그러나 상기 굽힘시험에 있어서는, 시편(7)을 V자형으로 구부린 후 굽힘시험장치의 상·하부프레임을 평판(2. 5)으로 바꾸어야 하는 번거로움이 따르며, 또한 하중을 가할 경우 삽입시험편(6)이 시편(7)밖으로 밀려나오는 현상이 발생되어 규정에 부합되게 평가할 수 없는 단점이 있었다.In the bending test, however, the test piece 7 has to be bent in a V shape, and then the upper and lower frames of the bending test apparatus have to be changed to a flat plate (2.5), and when a load is applied, the insertion test piece (6) The phenomenon of being pushed out of the specimen (7) occurred, which could not be evaluated in compliance with the regulations.

또한, 시편(7)에 가해지는 하중이 균일하게 작용하지 않아 평가의 신뢰성이 저하되는 문제점도 있었다.Moreover, there also existed a problem that the load applied to the test piece 7 did not act uniformly, and the reliability of evaluation fell.

본 고안은 상기한 문제점을 해결하기 위한 것으로, 평가공정이 단순하고 평가의 신뢰성 및 작업능률이 향상된 표면처리강판용 굽힘시험장치를 제공함에 그 목적이 있다.The present invention is to solve the above problems, and the object of the present invention is to provide a bending test apparatus for a surface-treated steel sheet with a simple evaluation process and improved reliability and work efficiency.

이하, 첨부한 도면에 의가 본 고안을 상세히 설명한다.Hereinafter, the present invention will be described in detail with the accompanying drawings.

제2도에서 상부프레임(A)는 T자형 펀쳐(13), 상부평판(12), 상부다이(11)로 이루어지는 바, 상기 상부평판(12)의 저면중앙부에는 편쳐(13)가 삽입되는 슬라이딩될 수 있는 요홈(10)이 형성되고, 상부다이(11)는 각도 K로 경사진 내측면(11a)을 가지며 볼트(16)에 의해 상부평판(12)의 저면 양측에 고정된다.In FIG. 2, the upper frame A is formed of a T-shaped puncher 13, an upper flat plate 12, and an upper die 11, and a sliding portion 13 is inserted into the center of the bottom surface of the upper flat plate 12. Grooved grooves 10 are formed, and the upper die 11 has an inner surface 11a inclined at an angle K and is fixed to both sides of the bottom surface of the upper flat plate 12 by bolts 16.

한편, 하부프레임부(B)는 하부다이(14)와 하부평판(15)으로 이루어지며, 상기 하부평판(15)에는 상기 하부다이(14)의 ⊥형돌기(14a)가 삽입되어 슬라이딩될 수 있는 요홈(19)이 상면 양측으로부터 상면중앙부까지 신장하여 형성되고, 하부다이(14)는 각도 K로 경사진 외측면(14b)을 가지며 저면에 형성된 ⊥형돌기(14a)를 통해 하부평판(15)의 요홈 (19)내를 슬라이딩될 수 있게 설치된다.On the other hand, the lower frame portion (B) is composed of a lower die 14 and the lower plate 15, the lower plate 15 is inserted into the U-shaped projection (14a) of the lower die 14 can slide. Grooved groove 19 is formed to extend from both sides of the upper surface to the upper surface center portion, the lower die 14 has an outer surface 14b inclined at an angle K and the lower plate 15 through the U-shaped projection 14a formed on the bottom surface. It is installed to be able to slide in the groove (19) of.

또한 하부다이(14)의 내·외측 상면모서리부와 상부다이(11)의 내측하면모서리부는 시편(17)이 펀쳐(13)에 의해 굴곡될 때 부드럽게 굽혀지도록 함과 아울러 경사진 내·외측면(11a, 14b)이 상호 간섭되지 않고 매끄럽게 맞닿을 수 있도록 하기 위해 곡률(R)을 갖게 한다. 또한 본 고안에 따른 굽힘시험장치의 모든 부품은 내마멸성이 강호고 충분한 강도와 경도를 갖고 있는 공구강으로 제작하는 것이 바람직하다.In addition, the inner and outer upper edge portions of the lower die 14 and the inner lower edge portion of the upper die 11 allow the specimen 17 to bend smoothly when bent by the puncher 13, as well as inclined inner and outer surfaces. The curvature R is made to allow 11a, 14b to contact smoothly without mutual interference. In addition, all parts of the bending test apparatus according to the present invention is preferably made of a tool steel having strong wear resistance and sufficient strength and hardness.

본 고안에 따른 굽힘시험장치의 작동을 설명하면, 제3도에서, 먼저 일정길이의 시편(17)을 하부다이(14)위에 올려 놓은 후 상부프레임부(A)를 구동시켜 펀쳐(13)가 시편(17)의 중앙부에 닿도록 하여 서서히 하중을 가하면 시편(17)은 펀쳐(13)에 의하여 굴곡되어 V자형으로 구부러진다. 이때 상부다이(11)의 경사진 내측면(11a)이 하부다이(14)의 경사진 외측면(14b)과 접촉되어 하부다이(14)를 하부평판(15)의 중앙부로 슬라이딩시킴으로서 시편(17)을 용이하게 V자형으로 굽힌다.Referring to the operation of the bending test apparatus according to the present invention, in Figure 3, first put the specimen 17 of a certain length on the lower die 14, then drive the upper frame portion (A) to the puncher 13 When the load is gradually applied to the center of the specimen 17, the specimen 17 is bent by the puncher 13 and bent in a V shape. At this time, the inclined inner surface 11a of the upper die 11 is in contact with the inclined outer surface 14b of the lower die 14, thereby sliding the lower die 14 to the center portion of the lower flat plate 15 so that the specimen 17 Bends easily into a V-shape.

이후 상부프레임부(A)를 작업전의 위치로 상승시키고 상부프레임부(A)의 요홈(10)에 장착된 펀쳐(13)를 슬라이딩시켜 분리한 다음 V자형으로 굴곡된 시편(17a)의 내측에 표면처리강판의 종류, 소재두께, 부착량등에 따라 규정된 갯수만큼의 삽입시험편(26)을 삽입한 상부프레임부(A)를 하강시켜 상부다이(11)를 하부다이(14)에 밀착시켜 계속해서 하중을 가하게 되면 상부다이(11)의 경사진 내측면에 하부다이(14)의 경사진 외측면과 맞닿아서 하부다이(14)를 하부평판(15)의 중앙부로 슬라이딩시켜 시편(17a)과 삽입시험편(6)을 밀착시켜 압박하여 시편(17a)을 U자형으로 굽힌다.Thereafter, the upper frame portion A is raised to the position before the operation, the puncher 13 mounted on the recess 10 of the upper frame portion A is slid and separated, and then inside the specimen 17a bent in a V shape. The upper die 11 is brought into close contact with the lower die 14 by lowering the upper frame portion A into which the prescribed number of insertion specimens 26 is inserted, depending on the type, material thickness, and adhesion amount of the surface-treated steel sheet. When a load is applied, the inclined inner surface of the upper die 11 is brought into contact with the inclined outer surface of the lower die 14 to slide the lower die 14 toward the center of the lower flat plate 15 so that the specimen 17a and Press the test piece 6 in close contact and bend the test piece 17a in a U shape.

상기 굽힘공정에 의한 시편(17a)의 도막밀착성 및 도금밀착성에 대한 평가는 시편(17a)의 굴곡부에 발생된 크랙(crack)이나 박리정도에 따라 평가되는데 평가방법으로는 육안 또는 광학현미경으로 관찰하거나 테이프를 시편(17a)의 굴곡부에 부착한 후 이를 다시 떼어내었을 때 묻어나오는 도금층이나 도막층량의 정도에 따라 평가하는 테이핑시험에 의하여 이루어진다.Evaluation of the coating film adhesion and plating adhesion of the specimen (17a) by the bending process is evaluated according to the crack (crack) or peeling degree generated in the bent portion of the specimen (17a) as an evaluation method by visual observation or optical microscope The tape is attached to the bent portion of the specimen 17a and then subjected to a taping test to evaluate the degree of plating layer or coating layer amount that comes out when it is removed again.

이상과 같은 본 고안은 종래 2개의 작업대에서 행하였던 번거로움을 없애고 하나의 작업대에서 굽힘공정이 이루어져 불필요한 작업공정을 단축하고 굽힘공정시 삽입시험편의 이탈을 방지함과 아울러 하중을 임의로 설정 부과할 수 있는 만능시험기나 유압장치에 장착가능하여 일정한 하중을 부과하는 것이 가능함으로써 시편에 대한 평가의 신뢰성을 향상시킬 수 있는 효과가 있다.The present invention as described above eliminates the hassle of two workbenches in the past, and the bending process is performed on one workbench to shorten the unnecessary work process, prevent the detachment of the insertion test piece during the bending process, and set the load arbitrarily. It can be mounted on a universal testing machine or a hydraulic system, and it is possible to apply a constant load, thereby improving the reliability of evaluation of the specimen.

Claims (1)

상부프레임(A)와 하부프레임부(B)를 갖는 표면처리강판용 굽힘시험장치에 있어서, 상기 상부프레임부(A)는 펀쳐(13)와, 상기 펀쳐(13)가 삽입되어 슬라이딩될 수 있는 요홈(10)이 저면중앙에 형성된 상부평판(12)과, 상기 상부평판(12)의 저면 양측에 볼트(16)로 체결되며 경사진 내측면(11a)을 갖는 상부다이(11)로 이루어지며, 상기 하부프레임부(B)는 하부다이(14)가 삽입되어 슬라이딩될 수 있는 요홈(19)이 상면 양측으로부터 상면중앙부까지 신장하여 형성된 하부평판(15)과, 상기 하부평판(15)의 요홈(19)에 삽입되어 슬라이딩될 수 있는 돌기(14a)를 저면에 가지며 경사진 외측면(14b)을 갖는 하부다이(14)로 이루어지며, 상기 상부프레임부(A)를 하강시켜 하중을 가하면 상기 상부다이(11)의 경사진 내측면(11a)이 상기 하부다이(14)의 경사진 외측면(14b)과 맞닿아서 상기 하부다이(14)가 상기 하부평판(15)의 중앙부로 슬라이딩되는 것을 특징으로 하는 표면처리강판용 굽힘시험장치.In the bending test apparatus for the surface-treated steel sheet having an upper frame (A) and a lower frame portion (B), the upper frame portion (A) is a hole in which the puncher (13) and the puncher (13) can be inserted and slid. 10 is formed of an upper plate 12 formed at the center of the bottom surface, and an upper die 11 fastened by bolts 16 on both sides of the bottom surface of the upper plate 12 and having an inclined inner surface 11a, The lower frame portion B includes a lower plate 15 formed by extending a groove 19 from which both sides of the lower die 14 are inserted and sliding from both sides of the upper surface to a central portion of the upper surface, and a recess of the lower plate 15. 19) is formed of a lower die 14 having a projection 14a, which is inserted into the slide and slides on the bottom, and has an inclined outer surface 14b, and the upper frame portion A is lowered to apply a load to the upper portion. The inclined inner surface 11a of the die 11 abuts against the inclined outer surface 14b of the lower die 14 so as to be imaged. The lower die 14 is surface-treated steel sheet bend test device characterized in that the sliding central portion of the lower plate (15).
KR2019930018489U 1993-09-15 1993-09-15 Bending tester KR960004812Y1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101326347B1 (en) * 2011-11-30 2013-11-11 현대하이스코 주식회사 V bending test device having enhanced reliability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101326347B1 (en) * 2011-11-30 2013-11-11 현대하이스코 주식회사 V bending test device having enhanced reliability

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