KR20060072157A - Fixture for compression test using universal joint and cross guide - Google Patents

Fixture for compression test using universal joint and cross guide Download PDF

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KR20060072157A
KR20060072157A KR1020040109352A KR20040109352A KR20060072157A KR 20060072157 A KR20060072157 A KR 20060072157A KR 1020040109352 A KR1020040109352 A KR 1020040109352A KR 20040109352 A KR20040109352 A KR 20040109352A KR 20060072157 A KR20060072157 A KR 20060072157A
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universal joint
compression
compression test
cross guide
anvil
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KR1020040109352A
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KR101160294B1 (en
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방원규
성환진
김인준
안상호
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재단법인 포항산업과학연구원
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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
    • G01N3/08—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
    • G01N3/12—Pressure testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G13/00—Chains
    • F16G13/02—Driving-chains
    • F16G13/10—Driving-chains with universal joints
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/223—Supports, positioning or alignment in fixed situation
    • 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
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or 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
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

본 발명은 압축시험시 만능시험기 전달축의 정렬?문제로 발생할 수 있는 실험상의 문제점을 시편 고정장치 수준에서 범용적으로 해소할 수 있는 조합형 치구에 관한 것이다.The present invention relates to a combination jig that can universally solve at the level of the specimen fixing device experimental problems that can occur due to the alignment and problem of the universal testing machine transmission shaft during the compression test.

본 발명은 기존의 형상과 유사한 압축앤빌을 인장 시험기의 축에 종래와 같이 직결하지 않고, 유니버셜 조인트를 통해 연결하고 상하부 움직임을 구속하는 교차 가이드를 사용하여, 시험기의 인장구동을 시편의 압축구동으로 전환함과 동시에 일정 범위의 정렬 불일치를 수용할 수 있는 개선된 형태의 시편 고정 도구를 제공한다.The present invention does not directly connect a compression and anvil similar to a conventional shape to the axis of the tensile tester, but uses a cross guide that connects through a universal joint and restrains the upper and lower movements. It provides an improved type of specimen holding tool that can accommodate a range of alignment mismatches as well as convert.

압축시험, 유니버셜조인트, 교차가이드Compression Test, Universal Joint, Cross Guide

Description

유니버셜 조인트 및 교차 가이드를 사용한 압축시험용 치구{Fixture for compression test using universal joint and cross guide}Fixture for compression test using universal joint and cross guide}

도 1은 본 발명에 따른 장치의 정면도,1 is a front view of a device according to the invention,

도 2는 본 발명의 작동원리에 대한 모식도.2 is a schematic diagram of the operation principle of the present invention.

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

1, 2 : 전달축 (pull rod) 연결부 3,4 : 유니버셜 조인트1, 2 pull rod connection part 3,4 universal joint

5, 6 : 압축 앤빌 (anvil) 7,8 : 교차형 정렬 가이드5, 6: compression anvil 7, 8: cross-aligned guide

s : 판상 인장시편s: plate tension specimen

본 발명은 압축시험시 만능시험기 전달축의 정렬?문제로 발생할 수 있는 실험상의 문제점을 시편 고정장치 수준에서 범용적으로 해소할 수 있는 조합형 치구에 관한 것이다.The present invention relates to a combination jig that can universally solve at the level of the specimen fixing device experimental problems that can occur due to the alignment and problem of the universal testing machine transmission shaft during the compression test.

통상적으로 압축 시험에서는 일반적으로 만능시험기의 고정부 (crosshead)와 구동부 (actuator) 에 각각 직결된 두개의 전달축 (pull rod) 말단에 시편을 누르기 위한 압축 앤빌 (anvil)을 체결하고 그 사이에 시편이 위치하게 된다. 이 때 앤 빌은 전달축에 구속되기 때문에 시편축과 전달축의 정렬은 전적으로 전달축의 설치시 정렬오차에 의존하게 된다.In compression testing, compression anvils are usually applied to press the specimens at the ends of two pull rods, which are connected directly to the crosshead and the actuator of the universal testing machine. Will be located. Since the anvil is constrained to the transmission axis, the alignment between the specimen axis and the transmission axis depends entirely on the alignment error in the installation of the transmission axis.

따라서, 전달축의 정렬이 틀어져 있을 경우 시편축과 구동방향이 어긋나게 되어 이상적인 일축압축 실험조건의 확보에 장애가 되고, 특히 인장시험에 비해 압축시험은 시험이 진행될 때 변형량이 커질수록 전달축 간의 거리가 계속 좁혀지게 되므로 정렬 오차의 영향이 증가하게 되어 전단변형이 심하게 유발되는 결과를 얻게 되는 불안정한 조건이 된다. 이러한 시험기 조정 불량 (configuration error) 에 의한 데이터 오차는 마찰에 의한 배럴링(barreling) 현상과 더불어 압축시험에서 주요한 문제점 중의 하나이다.Therefore, if the transmission shaft is misaligned, the specimen shaft and the driving direction are shifted, which hinders the securing of the ideal uniaxial compression test conditions.In particular, the compression test in comparison with the tensile test, the distance between the transmission shafts increases as the amount of deformation increases as the test proceeds. As it is narrowed, the influence of alignment error increases, which is an unstable condition that results in severe shear deformation. The data error caused by the configuration error of the tester is one of the main problems in the compression test along with the barreling phenomenon caused by friction.

이러한 오류를 줄이는 가장 이상적인 방법은 시험기 자체가 전달축 정렬이 완벽하게 이루어져 있는 조건 하에서 실험을 수행하는 것이나, 다양한 조건 및 소재를 대상으로 하는 환경에서는 잦은 로드셀의 교체 등으로 인하여 상시 유지할 수 있는 정렬 오차 수준에 한계가 있다.The ideal way to reduce this error is to perform the experiment under the condition that the tester itself is perfectly aligned on the transfer shaft, but in the case of various conditions and materials, the alignment error can be maintained constantly due to frequent load cell replacement. There is a limit to the level.

또한 매우 낮은 하중이 작용하게 되는 일부 경금속의 고온시험이나 단결정 시험 같은 경우에는 더욱 높은 정렬 정밀도가 필요하며, 이 때는 시험기 제조사가 공급하는 전용 정렬치구 (align fixture) 를 사용하여 상당한 시간과 노력을 들여 정렬을 맞추어야 하는 등의 불편이 있다.In addition, higher alignment accuracy is required for some high-temperature tests or single crystal tests of some light metals where very low loads are applied.In this case, a dedicated alignment fixture provided by the tester manufacturer is used, and considerable time and effort are spent. It is inconvenient to align the alignment.

본 발명은 상기한 문제점을 해결하기 위하여 창안된 것으로서, 압축시험 시편의 형상이나 장착 방법은 최대한 유지하면서 시편 고정부에서 일정 범위의 정렬 편차를 자체 수용할 수 있는 디자인을 적용하여 시험기의 상태와 무관하게 일정 수준의 정밀도를 확보할 수 있는 무정렬치구(align-free fixture)를 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, by applying a design that can accommodate a certain range of alignment deviation in the specimen fixing portion while maintaining the shape and mounting method of the compression test specimen as much as possible regardless of the state of the tester The aim is to provide an align-free fixture that can achieve a certain level of precision.

또한, 전술한 바와 같은 압축시험의 근본적인 구동상의 불안정을 해소하기 위하여 시험기의 인장구동을 시편에 대한 압축구동으로 전환할 수 있는 기능을 겸비한 무정렬치구를 제공하는데 그 목적이 있다.It is also an object of the present invention to provide an unaligned jig having a function of converting the tensile drive of the tester into the compression drive for the specimen in order to solve the fundamental driving instability of the compression test as described above.

상기한 기술적 과제를 달성하기 위하여 본 발명은 전달축 연결부에 연결된 유니버셜조인트와 시편을 압축하는 압축앤빌과 상기 압출앤빌의 상하를 둘러싼 교차형 가이드로 구성되어 시험기의 인장구동을 앤빌의 압축구동으로 전환하며 편심 하중 상태에서도 1축 압축을 유지시켜주는 유니버셜 조인트 및 교차 가이드를 사용한 압축시험용 치구를 제공한다.In order to achieve the above technical problem, the present invention comprises a universal joint connected to a transmission shaft connection, a compression anvil for compressing a specimen, and a cross-section guide surrounding the upper and lower sides of the extrusion anvil, thereby converting the tensile drive of the tester to the compression drive of the anvil. It also provides compression test fixture with universal joint and cross guide to maintain uniaxial compression under eccentric load.

이하, 도면을 참조하여 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.

도 1은 시료(S)를 압축하는 무정렬치구의 정면도로서, 본 발명은 교차형 가이드에 장착된 압축앤빌이 유니버셜 조인트를 통하여 연결된 형태의 치구를 제안한다.1 is a front view of an unaligned jig for compressing a sample S, and the present invention proposes a jig of a type in which a compression anvil mounted on a cross guide is connected through a universal joint.

보다 상세히 기술하면, 전달축 연결부(1)(2)는 종래의 압축 앤빌 기저부와 같은 형상으로 전달축에 너트 등을 통하여 완전히 고정되며, 2 회전 자유도를 갖는 유니버셜 조인트(3)(4)에 직결된다. 유니버셜 조인트 (3)(4)의 다른 한쪽에는 압축 앤빌 (5)(6)이 상하 교차형 가이드(7)(8)에 부착되어 연결된다. More specifically, the transmission shaft connecting portion (1) (2) is completely fixed to the transmission shaft through a nut or the like in the same shape as a conventional compression anvil base, and directly connected to the universal joint (3) (4) having two degrees of freedom. do. On the other side of the universal joint (3) (4) a compression anvil (5) (6) is attached and connected to the upper and lower cross guides (7) (8).                     

이러한 교차형 가이드(7)(8)를 사용함으로써 하부 압축앤빌(6)은 상부 전달축에 연결되고, 상부 압축앤빌(5)은 하부 전달축에 연결되어 시험기의 구동과 앤빌의 구동이 역으로 작용하는 구조를 가진다.By using such a cross guide (7) (8) the lower compression anvil (6) is connected to the upper transmission shaft, the upper compression anvil (5) is connected to the lower transmission shaft, the drive of the tester and the drive of the anvil reverse Has a working structure

이하, 본 발명의 작용에 대하여 상세하게 설명한다.Hereinafter, the effect | action of this invention is demonstrated in detail.

본 발명의 작용은 도 2에 모식적으로 나타낸 것과 같이, 교차형 가이드(7)(8)에 의하여 시험기의 인장 구동(T) (전달축간의 거리가 멀어지는 방향) 이 시편의 압축 구동(C) (앤빌간의 거리가 좁혀지는 방향) 으로 작용하게 되어 시험기 구동의 불안정성이 근본적으로 해소되며, 시험기의 정렬이 틀어져 있는 경우에도 2축 자유도를 갖는 유니버셜 조인트(3)(4)에 의해 수용되기 때문에 시편 자체의 움직임은 유니버셜 조인트(3)(4)의 가동범위를 벗어날 정도의 심한 틀어짐을 제외하고는 항시 1축 압축상태로 유지가 된다.As shown schematically in FIG. 2, the action of the present invention is the tensile drive T of the tester (direction away from the transmission axis) of the test piece by the cross-shaped guides 7 and 8. (In the direction of narrowing the distance between the anvils), the instability of the tester operation is fundamentally eliminated, and even if the tester is misaligned, it is accommodated by the universal joint (3) (4) having biaxial freedom. The movement of itself is always kept in uniaxial compression, except for severe distortion that is beyond the range of motion of the universal joint (3) (4).

본 발명의 효과는 복잡한 과정을 거쳐 시험기 자체의 정렬 보정을 하지 않고도 시편 고정용 치구만으로 고정밀도의 1축 압축상태를 확보할 수 있다는 데 있고, 압축 시험에 대해서도 시험기 자체는 인장 구동을 하기 때문에 구조적인 불안정성을 해소할 수 있다. 이러한 특징은 종래의 구성으로는 압축시험이 불가능한 인장 전용의 정적(static) 기기에서도 압축시험을 수행할 수 있게 해주는 부가적인 효과가 있다. 또한 시편과 접하는 앤빌의 형상은 동일하기 때문에 시편의 형상이나 장착방법에는 거의 차이가 없으며, 전달축 연결부(1)(2)의 형상 변화에 따라 다양한 시험기에 범용적으로 적용할 수 있다는 장점도 가지고 있다.The effect of the present invention is that it is possible to secure a high-precision uniaxial compression state only by the specimen fixing jig without complicated alignment process of the tester itself, and the tester itself is a tensile drive for the compression test structure Can resolve the instability. This feature has the additional effect of allowing the compression test to be performed in a static device dedicated to tension, which is not possible with the conventional configuration. In addition, since the shape of the anvil contacting the specimen is the same, there is almost no difference in the shape of the specimen or the mounting method, and it has the advantage that it can be universally applied to various testers according to the change of the shape of the transmission shaft connecting portion (1) and (2). have.

Claims (2)

전달축 연결부(1)(2)에 연결된 유니버셜조인트(3)(4)와 Universal joint (3) (4) connected to transmission shaft connection (1) (2) 시편(s)을 압축하는 압축앤빌(5)(6)과Compression anvil (5) (6) for compressing the specimen (s) and 상기 압출앤빌(5)(6)의 상하를 둘러싼 교차형 가이드(7)(8)로 구성되어It consists of a cross-shaped guide (7) (8) surrounding the top and bottom of the extrusion and bill (5) (6) 시험기의 인장구동을 앤빌의 압축구동으로 전환하며 편심 하중 상태에서도 1축 압축을 유지시켜주는 유니버셜 조인트 및 교차 가이드를 사용한 압축시험용 치구.Compression test fixture using universal joint and cross guide that converts the tension drive of the tester to the compression drive of anvil and maintains uniaxial compression under eccentric load. 청구항 1에 있어서,The method according to claim 1, 상기 유니버셜조인트(3)(4)는 2축 자유도를 갖는 것을 특징으로 하는 유니버셜 조인트 및 교차 가이드를 사용한 압축시험용 치구.The universal joint (3) (4) is a compression test jig using a universal joint and a cross guide, characterized in that it has a biaxial freedom.
KR1020040109352A 2004-12-21 2004-12-21 Fixture for compression test using universal joint and cross guide KR101160294B1 (en)

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* Cited by examiner, † Cited by third party
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KR20150104492A (en) * 2014-03-05 2015-09-15 정재성 Jig for universal testing machine
KR20190007973A (en) * 2017-07-14 2019-01-23 삼금공업(주) Zig for testing buckling stress of tie rod
CN112179758A (en) * 2020-09-25 2021-01-05 华东理工大学 Mechanical property test fixture and device

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KR100231802B1 (en) * 1997-12-26 1999-12-01 장병주 Adhesive shear strength testing device
KR100456558B1 (en) * 2002-03-21 2004-11-10 현대자동차주식회사 Apparatus for testing tension and fatigue under high temperature condition using reflection furnace

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150104492A (en) * 2014-03-05 2015-09-15 정재성 Jig for universal testing machine
KR20190007973A (en) * 2017-07-14 2019-01-23 삼금공업(주) Zig for testing buckling stress of tie rod
CN112179758A (en) * 2020-09-25 2021-01-05 华东理工大学 Mechanical property test fixture and device
CN112179758B (en) * 2020-09-25 2024-03-29 华东理工大学 Mechanical property testing device

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