KR102608757B1 - Straight degree testing jig for shoulder bolt - Google Patents
Straight degree testing jig for shoulder bolt Download PDFInfo
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- KR102608757B1 KR102608757B1 KR1020210131502A KR20210131502A KR102608757B1 KR 102608757 B1 KR102608757 B1 KR 102608757B1 KR 1020210131502 A KR1020210131502 A KR 1020210131502A KR 20210131502 A KR20210131502 A KR 20210131502A KR 102608757 B1 KR102608757 B1 KR 102608757B1
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- shoulder bolt
- straightness
- pipe
- shoulder
- length
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- 238000012360 testing method Methods 0.000 title claims abstract description 16
- 238000007689 inspection Methods 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/245—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing perpendicularity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
본 발명은 숄더볼트의 진직도 검사지그에 관한 것으로, 허용가능한 최대 진직도에 대응된 내경을 가지며, 검사할 숄더볼트를 하단에서 헤드부에 인접하여 패치(3)가 형성된 축부를 제외한 숄더볼트의 길이를 삽입하도록 된 파이프(1)를 포함하여, 숄더볼트를 헤드부가 하측에 위치하게 패치(3)가 형성되기 전까지의 길이 만큼 상기 파이프(1)에 삽입하여 자유낙하시켜 숄더볼트의 진직도를 검사하도록 구성됨으로써, 허용가능한 진직도를 갖는 숄도볼트가 통과할 수 있는 정도의 최대 내경을 갖는 파이프를 통해 숄더볼트를 낙하시켜 파이프를 완전히 통과하는지를 검사하여 통과될 때에 숄더볼트의 진직도를 합격판정하도록 하고 파이프 중간에 숄더볼트가 걸려 낙하되지 않을 때에 숄더볼트의 진직도를 불합격 처리토록 함으로써, 숄더볼트의 진직도를 장소의 제약없이 매우 간편하게 수행할 수 있어 검사 작업의 효율성이 크게 향상되고, 숙련된 기술자가 아니라도 쉽게 검사를 수행할 수 있어 검사작업자의 인건비 부담을 경감하며, 고가의 검사장비가 필요 없어 종래 고가의 검사장비 구매 및 관리 비용에 대한 부담을 제거할 수 있어 제조비용을 절감할 수 있는 효과가 있다.The present invention relates to a straightness test jig for a shoulder bolt, which has an inner diameter corresponding to the maximum allowable straightness, and is used to inspect the shoulder bolt except for the shaft portion where the patch (3) is formed adjacent to the head portion at the bottom. Including the pipe (1) for inserting the length, the shoulder bolt is inserted into the pipe (1) for the length until the patch (3) is formed so that the head part is located on the lower side and allowed to fall freely to maintain the straightness of the shoulder bolt. By being configured to inspect, the straightness of the shoulder bolt is passed by dropping the shoulder bolt through a pipe with the maximum inner diameter through which a shoulder bolt with acceptable straightness can pass and checking whether it completely passes through the pipe. By determining the straightness of the shoulder bolt and rejecting it when the shoulder bolt is caught in the middle of the pipe and does not fall, the straightness of the shoulder bolt can be checked very easily without location restrictions, greatly improving the efficiency of the inspection work. Inspections can be easily performed even by non-skilled technicians, reducing the burden of labor costs on inspection workers, and eliminating the need for expensive inspection equipment, thereby eliminating the burden of purchasing and managing expensive inspection equipment, thereby reducing manufacturing costs. There is an effect that can be done.
Description
본 발명은 숄더볼트의 진직도 검사지그에 관한 것으로, 특히 장볼트 형태로 된 숄더볼트의 진직도를 고가의 장비를 사용하지 않고 장소의 제약없이 간편하고 신속하게 검사할 수 있도록 개선된 구조의 숄더 볼트의 진직도 검사지그에 관한 것이다. The present invention relates to a straightness test jig for shoulder bolts, and in particular, to a shoulder bolt with an improved structure so that the straightness of shoulder bolts in the form of long bolts can be inspected simply and quickly without using expensive equipment and without restrictions on location. This is about the bolt straightness inspection jig.
일반적으로 배터리용으로 사용되는 장볼트 형태의 숄더볼트는 선재를 절단하여 헤드와 나사부를 가공하여 제조하며, 이때 선재 및 봉의 제조과정중의 열처리 수행에 따른 열변형 및 운송과정에서 휨이나 비틀림 변형이 발생될 수도 있고, 이러한 변형이 발생된 제품은 검사를 통해 선별해야 한다.Shoulder bolts in the form of long bolts, generally used for batteries, are manufactured by cutting wire rods and processing the heads and threads. At this time, thermal deformation due to heat treatment during the manufacturing process of the wire rods and rods and bending or torsional deformation during transportation occur. This may occur, and products with such modifications must be selected through inspection.
이러한 선재로 제조되는 장볼트를 포함한 숄더볼트가 진직도를 갖추지 못한 경우에는 예를들어 숄더볼트로 다수의 셀들이 포함한 배터리 모듈의 상하 플레이트들을 체결할 때, 그 조립 정밀도가 떨어지게 되고, 이 경우 조립된 배터리 모듈의 작동중에 셀들에서 발생되는 열에 의해 팽창되고 사용하지 않을 때에는 수축되는 배터리 모듈의 특성을 수용하지 못하게 되어 배터리 모듈의 손상을 초래할 수도 있기 때문이다. If shoulder bolts including long bolts manufactured from such wires do not have straightness, for example, when fastening the upper and lower plates of a battery module containing a large number of cells with shoulder bolts, the assembly precision will be reduced, and in this case, the assembly precision will be reduced. This is because the characteristics of the battery module, which expands due to heat generated from the cells during operation of the battery module and contracts when not in use, may not be accommodated, which may result in damage to the battery module.
이로 인하여 숄더볼트는 진직도 검사가 필수적이며, 이를 위하여 숄더볼트의 진직도를 검사하기 위한 방법의 예로는, 한국 공개특허공보 제10-2013-0141063호(공개일자 2013년12월26일)에 개시된 "레이저를 이용한 직진도 체크 기구"와, 한국 공개특허공보 제10-2021-0086190호(공개일자 2021년07월08일)에 개시된 "육각봉 직진도 검사시스템" 에서는 레이저 조사장비를 구비하는 복잡한 구조로 되어 검사장치의 제조비용의 상승을 초래하고, 필요에 따라 검사장소를 이동하여 제품 검사를 하기 어려운 문제와, 제품 검사에 시간이 많이 소모되는 문제가 있었다.For this reason, straightness testing is essential for shoulder bolts, and for this purpose, an example of a method for testing the straightness of shoulder bolts is in Korean Patent Publication No. 10-2013-0141063 (published on December 26, 2013). In the “straightness check mechanism using a laser” disclosed and the “hexagonal bar straightness inspection system” disclosed in Korean Patent Publication No. 10-2021-0086190 (publication date July 8, 2021), a laser irradiation equipment is provided. The complicated structure caused an increase in the manufacturing cost of the inspection device, it was difficult to move the inspection location to inspect the product as needed, and there were problems that a lot of time was consumed in product inspection.
본 발명의 목적은 상기한 종래 기술의 숄더볼트의 진직도 검사에 따른 문제점을 해결하기 위하여, 허용가능한 숄더볼트의 진직도를 감안한 내경의 파이프에 숄더볼트를 삽입하여 배치한 상태에서 자유낙하시켜 파이프에 숄더볼트가 걸리지 않고 낙하되는지 여부로 숄더볼트의 진직도를 간편하고 신속하게 검사할 수 있도록 개선된 숄더볼트의 진직도 검사지그를 제공하는 것이다. The purpose of the present invention is to solve the problems caused by the straightness test of the shoulder bolt of the prior art as described above, by inserting a shoulder bolt into a pipe with an inner diameter considering the allowable straightness of the shoulder bolt and allowing it to freely fall while placed. An improved shoulder bolt straightness inspection jig is provided so that the straightness of the shoulder bolt can be easily and quickly checked by checking whether the shoulder bolt falls without being caught.
상기한 목적을 달성하기 위하여, 본 발명에 의한 숄더볼트의 진직도 검사지그는, 허용가능한 최대 진직도에 대응된 내경을 가지며, 검사할 숄더볼트를 하단에서 헤드부에 인접하여 패치가 형성된 축부를 제외한 숄더볼트의 길이를 삽입하도록 된 파이프를 포함하여, 숄더볼트를 헤드부가 하측에 위치하게 패치(3)가 형성되기 전까지의 길이 만큼 상기 파이프에 삽입하여 자유낙하시켜 숄더볼트의 진직도를 검사하도록 구성된다.In order to achieve the above object, the straightness test jig for the shoulder bolt according to the present invention has an inner diameter corresponding to the maximum allowable straightness, and the shoulder bolt to be inspected is adjacent to the head portion at the bottom, excluding the shaft portion where the patch is formed. It includes a pipe for inserting the length of the shoulder bolt, and is configured to inspect the straightness of the shoulder bolt by inserting the shoulder bolt into the pipe for the length until the patch (3) is formed with the head located at the lower side and allowing it to freely fall. do.
상기 파이프의 중간에 작업자가 손으로 지그를 잡기 위한 손잡이부가 파이프의 곡률반경에 대응된 곡률반경으로 길이방향으로 반원 형태로 요홈이 형성된 두개로 분할된 상태에서 파이프의 외주면에 결합하여 장착되어, 작업자의 체열에 의한 진직도 검사의 오류를 방지하도록 구성되는 것이 바람직하다.In the middle of the pipe, the handle part for the worker to hold the jig with his hand is divided into two with a groove formed in the shape of a semicircle in the longitudinal direction with a curvature radius corresponding to the curvature radius of the pipe, and is coupled to the outer peripheral surface of the pipe and installed, It is desirable to be configured to prevent errors in straightness testing caused by body heat.
또한, 진직도를 검사할 숄더볼트의 길이는 헤드부에서 미리 설정된 길이로 형성되는 패치를 제외한 숄더볼트가 삽입되는 전체 길이에 대응된 길이를 가지며, In addition, the length of the shoulder bolt to be tested for straightness has a length corresponding to the entire length into which the shoulder bolt is inserted, excluding the patch formed at a preset length in the head part,
상기 파이프의 내경은 검사할 숄더볼트의 외경과, 허용가능한 최대 진직도에서 여러 변수들에 의한 오차 발생을 감안하여 미리 설정된 값을 제외한 진직도 를 더한 값으로 설정된다.The inner diameter of the pipe is set as the sum of the outer diameter of the shoulder bolt to be inspected and the straightness excluding the preset value in consideration of errors caused by various variables in the maximum allowable straightness.
본 발명에 의한 숄더볼트 진직도 검사지그는 허용가능한 진직도를 갖는 숄도볼트가 통과할 수 있는 정도의 최대 내경을 갖는 파이프를 통해 숄더볼트를 낙하시켜 파이프를 완전히 통과하는지를 검사하여 통과될 때에 숄더볼트의 진직도를 합격판정하도록 하고 파이프 중간에 숄더볼트가 걸려 낙하되지 않을 때에 숄더볼트의 진직도를 불합격 처리토록 함으로써, 숄더볼트의 진직도를 장소의 제약없이 매우 간편하게 수행할 수 있어 검사 작업의 효율성이 크게 향상되고, 숙련된 기술자가 아니라도 쉽게 검사를 수행할 수 있어 검사작업자의 인건비 부담을 경감하며, 고가의 검사장비가 필요 없어 종래 고가의 검사장비 구매 및 관리 비용에 대한 부담을 제거할 수 있어 제조비용을 절감할 수 있는 효과가 있다.The shoulder bolt straightness test jig according to the present invention drops the shoulder bolt through a pipe with the maximum inner diameter through which a shoulder bolt with acceptable straightness can pass, and checks whether the shoulder bolt completely passes through the pipe. When the shoulder bolt passes, the shoulder bolt By judging the straightness of the pipe as pass and rejecting the straightness of the shoulder bolt when the shoulder bolt is caught in the middle of the pipe and does not fall, the straightness of the shoulder bolt can be checked very easily without location restrictions, increasing the efficiency of inspection work. This has greatly improved, and even non-skilled technicians can easily carry out inspections, which reduces the labor cost burden on inspection workers. Also, since there is no need for expensive inspection equipment, the burden of purchasing and managing expensive inspection equipment can be eliminated. This has the effect of reducing manufacturing costs.
도 1은 본 발명에 의한 숄더볼트의 진직도 검사지그에서 손잡이부를 조립하는 것을 보여주는 개략적인 사시도.
도 2는 도 1의 검사지그의 파이프에 숄더볼트를 삽입하여 진직도를 검사하기 위한 준비 상태를 보여주는 사시도.
도 3은 도 2의 준비상태에서 숄더볼트를 자유낙하시켜 숄더볼트의 진직도를 검사하는 것을 보여주는 사시도.Figure 1 is a schematic perspective view showing assembling the handle portion in the straightness inspection jig of the shoulder bolt according to the present invention.
Figure 2 is a perspective view showing a state of preparation for inspecting straightness by inserting a shoulder bolt into the pipe of the inspection jig of Figure 1.
Figure 3 is a perspective view showing testing the straightness of the shoulder bolt by letting the shoulder bolt fall freely in the prepared state of Figure 2.
이하에서는 본 발명의 숄더볼트의 진직도 검사지그의 실시예를 도시한 첨부 도면을 참고하여 본 발명을 보다 상세히 설명하기로 한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing an embodiment of the straightness test jig for the shoulder bolt of the present invention.
도 1에 도시된 바와 같이, 본 발명에 의한 숄더볼트의 진직도 검사지그는 미리 설정된 내경과 길이를 갖고 정확한 진직도를 갖는 파이프(1)와, 그 파이프(1)의 중간에 장착하여 작업자가 손으로 지그를 잡기 위한 손잡이부(2)를 포함한다. As shown in Figure 1, the straightness test jig for the shoulder bolt according to the present invention is installed in the middle of the pipe (1) with a preset inner diameter and length and accurate straightness, and the pipe (1) to prevent the operator's hand. It includes a handle part (2) for holding the jig.
상기 손잡이부는 작업자가 손으로 직접 파이프를 잡는 경우 체열에 의한 파이프의 열변형에 의한 진직도 검사의 오류 발생을 방지하기 위한 것이다. 또한, 상기 손잡이부(2)는 파이프의 곡률반경에 대응된 곡률반경으로 길이방향으로 반원 형태로 요홈이 형성된 두개로 분할된 상태에서 파이프(1)의 외주면에 결합하여 형성된다.The handle part is intended to prevent errors in the straightness test due to thermal deformation of the pipe due to body heat when the worker holds the pipe directly with his or her hand. In addition, the handle portion 2 is formed by being joined to the outer peripheral surface of the pipe 1 in a state in which it is divided into two grooves formed in a semicircular shape in the longitudinal direction with a radius of curvature corresponding to the radius of curvature of the pipe.
진직도를 검사할 숄더볼트에서, 헤드부에서 하측으로 20mm까지 패치가 코팅되므로 상기 파이프(1)의 길이는 하단에서 헤드부 하측 20mm까지의 길이에 대하여 진직도를 검사하게 되므로, 지그의 파이프 길이는 숄더헤드의 헤드에서 하측으로 20mm 까지의 길이가 삽입되는 정도의 길이로 형성된다.In the shoulder bolt for which straightness is to be tested, a patch is coated up to 20 mm from the head to the bottom, so the length of the pipe (1) is tested for straightness from the bottom to 20 mm below the head, so the pipe length of the jig is formed to a length that allows up to 20 mm of length to be inserted downward from the head of the shoulder head.
또한, 상기 파이프(2)의 내경은 검사할 숄더볼트의 허용가능한 최대 진직도를 감안하여 설정한다. 예를들어, 숄더볼트의 외경 φ 8mm에 최대 진직도 φ0.55mm로 설정할 수 있으나, 검출력 상향 및 기타 변수들을 감안하여 위 기준의 진직도 보다 작은 φ0.45mm를 최대 진직도로 설정하는 것이 바람직하다. 따라서, 파이프의 내경은 φ 8.45mm로 설정한다.Additionally, the inner diameter of the pipe 2 is set considering the maximum allowable straightness of the shoulder bolt to be inspected. For example, the outer diameter of the shoulder bolt is 8mm and the maximum straightness can be set to 0.55mm. However, considering the increase in detection power and other variables, it is desirable to set the maximum straightness to 0.45mm, which is smaller than the above standard straightness. . Therefore, the inner diameter of the pipe is set to 8.45mm.
도 2에 도시된 바와 같이, 작업자는 손잡이부(2)를 잡고 검사할 숄더볼트(4)를 그 헤드부가 하측에 위치하게 한 상태에서 하단부터 파이프(1)에 밑에서 위로 삽입한 상태로 검사 준비를 한다.As shown in Figure 2, the operator holds the handle portion (2) and prepares for the inspection by inserting the shoulder bolt (4) to be inspected into the pipe (1) from the bottom upward with its head located at the lower side. Do.
이어서, 도 3에 도시된 바와 같이, 검사지그의 파이프(1)에 삽입된 검사할 숄더볼트(4)를 수직으로 자유낙하시켜서 숄더볼트가 완전히 낙하되면 해당 제품을 합격처리하고, 숄더볼트(4)가 열변형, 가공 및 운송 과정에서 발생될 수 있는 휨 때문에 파이프내에서 걸리게 되면 해당제품을 불합격 처리한다.Next, as shown in FIG. 3, the shoulder bolt to be inspected (4) inserted into the pipe (1) of the inspection jig is allowed to fall freely vertically, and when the shoulder bolt completely falls, the product is passed, and the shoulder bolt (4) is ) is caught in the pipe due to thermal deformation, bending that may occur during processing and transportation, the product is disqualified.
이와 같이, 본 발명에 의한 진직도 검사지그는 협소한 공간에서도 특별한 기술 없이 누구나 쉽고 간편하게 수행할 수 있어서, 생산 작업 현장에서도 검사를 수행할 수 있고, 종래 숄더볼트의 진직도 검사를 위한 검사장비가 설치된 곳으로 운송해야 하는 문제로 생산성이 저하되는 문제가 해결되어 숄더볼트의 생산성도 향상시킬 수 있게 된다.In this way, the straightness inspection jig according to the present invention can be easily and conveniently performed by anyone without special skills even in a small space, so inspection can be performed even at the production site, and inspection equipment for straightness inspection of conventional shoulder bolts is installed. The problem of lower productivity due to the need to transport to different locations is solved, and the productivity of shoulder bolts can also be improved.
본 발명은 배터리 모듈 조립에 사용되는 숄더볼트와 같은 장볼트의 진직도를 간편하게 검사하기 위하여 이용될 수 있다. The present invention can be used to conveniently check the straightness of long bolts such as shoulder bolts used in battery module assembly.
1 ; 파이프 2 : 손잡이
3 : 패치 4 : 숄더볼트One ; Pipe 2: Handle
3: Patch 4: Shoulder bolt
Claims (3)
진직도를 검사할 파이프의 길이는 헤드부에서 패치(3)가 형성되는 길이를 제외한 숄더볼트(4)가 삽입되는 전체 길이에 대응된 길이를 가지며,
상기 파이프(2)의 내경은 검사할 숄더볼트의 외경과, 허용가능한 최대 진직도에서 여러 변수들에 의한 오차 발생을 감안하여 미리 설정된 값을 제외한 진직도 를 더한 값으로 설정된 것을 특징으로 하는 숄더볼트의 진직도 검사지그.
It has an inner diameter corresponding to the maximum allowable straightness, and includes a pipe (1) for inserting the length of the shoulder bolt to be inspected, excluding the shaft portion where the patch (3) is formed adjacent to the head at the bottom, the shoulder bolt In the straightness test jig of the shoulder bolt, which is designed to inspect the straightness of the shoulder bolt by inserting the bolt into the pipe (1) for the length until the patch (3) is formed with the head located at the lower side and allowing it to fall freely,
The length of the pipe to be tested for straightness has a length corresponding to the entire length into which the shoulder bolt (4) is inserted, excluding the length where the patch (3) is formed at the head,
The inner diameter of the pipe (2) is set to the outer diameter of the shoulder bolt to be inspected plus the straightness excluding the preset value in consideration of errors caused by various variables in the maximum allowable straightness. Shoulder bolt Straightness inspection jig.
상기 파이프(1)의 중간에 작업자가 손으로 지그를 잡기 위한 손잡이부(2)가 파이프의 곡률반경에 대응된 곡률반경으로 길이방향으로 반원 형태로 요홈이 형성된 두개로 분할된 상태에서 파이프(1)의 외주면에 결합하여 장착되어, 작업자의 체열에 의한 진직도 검사의 오류를 방지하도록 된 것을 특징으로 하는 숄더볼트의 진직도 검사지그.
According to clause 1,
In the middle of the pipe (1), the handle portion (2) for the worker to hold the jig with his hand is divided into two with a groove formed in the shape of a semicircle in the longitudinal direction with a radius of curvature corresponding to the radius of curvature of the pipe (1). ) A straightness test jig for a shoulder bolt, characterized in that it is coupled and mounted on the outer peripheral surface of the shoulder bolt to prevent errors in straightness test due to the worker's body heat.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100784340B1 (en) | 2006-08-25 | 2007-12-13 | 한국원자력연구원 | Measuring system for pitched metal rod |
| JP2015137964A (en) * | 2014-01-23 | 2015-07-30 | トヨタ自動車株式会社 | Thickness measuring method |
| KR101910555B1 (en) | 2017-06-12 | 2018-10-22 | 오광석 | displacement measurement device for recoil of firearm |
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| JP3429103B2 (en) * | 1995-04-14 | 2003-07-22 | 積水ハウス株式会社 | Anchor bolt neck out measuring device |
| KR20130141063A (en) | 2012-06-15 | 2013-12-26 | 현대중공업 주식회사 | Straightness check device using laser |
| KR102415624B1 (en) | 2019-12-31 | 2022-07-01 | 유진인스텍코어 주식회사 | Hexagonal bar straightness inspection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100784340B1 (en) | 2006-08-25 | 2007-12-13 | 한국원자력연구원 | Measuring system for pitched metal rod |
| JP2015137964A (en) * | 2014-01-23 | 2015-07-30 | トヨタ自動車株式会社 | Thickness measuring method |
| KR101910555B1 (en) | 2017-06-12 | 2018-10-22 | 오광석 | displacement measurement device for recoil of firearm |
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