Gage mark engraving device

Abstract

To provide a gage mark engraving device that can accurately engrave gage marks on a surface of a test piece with a simple configuration.SOLUTION: A gage mark engraving device 1 engraves a plurality of gage marks P1, P2 on a surface of a long test piece T. A base 2 of the gage mark engraving device 1 has: a base part 10 extending along a horizontal direction; a support part 20 attached to the base part 10 and supporting the test piece T from below; an attachment part 30 provided at a position above the support part 20 for attaching engraving tools 3; a positioning part 50 arranged at a position on a lateral side of the support part 20 in an extension direction of the base part 10, in contact with one end T1b in an axial direction of the test piece T supported by the support part 20, and determining the position in the axial direction of the test piece T; and a fixing part 40 provided on the attachment part 30 and fixing the test piece T supported by the support part 20 from above. The positioning part 50 can move in the extension direction relative to the support part 20, and adjust the position in the axial direction of the test piece T supported by the support part 20.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a marking device, and more particularly to a marking device for marking a plurality of marks on the surface of a long test piece. [Background technology]

[0002] In the tensile test of turnbuckles, it is stipulated that the elongation of the threaded part of the test specimen must be measured. In order to measure the elongation of the threaded part, it is necessary to stamp two gauge marks on the surface of the long threaded part and measure the distance between the gauge marks. The test specimen on which the gauge marks are stamped is cylindrical and unstable, so it was difficult to stamp the gauge marks accurately and safely. Therefore, Patent Documents 1 and 2 propose an apparatus for stamping a reference mark on a long test piece, which is equipped with a base that supports the test piece from below and an engraving tool for stamping the reference mark.

[0003] In the device described in Patent Document 1, a cylindrical test piece supported on a base is fixed by being covered by a top plate. A guide tube is placed on the top plate so as to contain a through hole formed in the top plate. A punch inserted into the guide tube is struck with a weight to stamp a reference point on the test piece.

[0004] In the jig described in Patent Document 2, a cylindrical test piece supported on a base is fixed by being covered with a top cover. A punch inserted into a through hole formed in the top cover is struck with a hammer to stamp a reference point on the test piece. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-100786 A [Patent Document 2] JP 2011-099830 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the tensile test of a turnbuckle, it is necessary to mark the test piece with a gauge point 40 mm from the start point of threading and 5 mm from the end point of threading. Therefore, the accuracy of the two gauge points in the axial direction of the test piece was required. However, in the device described in Patent Document 1, the position of the test specimen in the vertical direction is fixed by the top plate, but the position of the test specimen in the axial direction is not fixed.

[0007] In the device described in Patent Document 2, a U-shaped cutout is formed in a base whose length can be adjusted according to the length of the test specimen. The grip of the test specimen is then fitted into the cutout, thereby fixing the position in the axial direction. However, the test specimen was not able to be adjusted in the axial direction while supported by the base, and the support table itself on which the test specimen was supported was divided, and one support table was configured to be movable relative to the other support table, which could increase the number of parts.

[0008] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a marking device that has a simple configuration and is capable of marking a mark on the surface of a test piece with high accuracy. [Means for solving the problem]

[0009] The above problem is solved by the mark stamping device of the present invention, which is a mark stamping device for stamping a plurality of mark marks on the surface of a long test piece, comprising a base for supporting the test piece from below, and a stamping tool attached to the base and for stamping the mark marks on the surface of the test piece from above, wherein the base has a base portion extending along the horizontal direction, a support portion attached to the base portion and supporting the test piece from below, a mounting portion provided above the support portion for mounting the stamping tool, a positioning portion disposed at a lateral position of the support portion in the extension direction of the base portion and abutting against one end of the axial direction of the test piece supported by the support portion to determine the position of the test piece in the axial direction, and a fixing portion provided on the mounting portion for fixing the test piece supported by the support portion from above, wherein the positioning portion moves in the extension direction relative to the support portion and is capable of adjusting the position of the test piece in the axial direction supported by the support portion.

[0010] With the above-described configuration, the position of the test piece in the axial direction can be easily determined by the positioning part. In addition, by moving the positioning part while the test piece is supported by the support part, the position of the test piece in the axial direction can be finely adjusted. Therefore, the marking position can be easily adjusted by moving the positioning portion, so that the marking position can be accurately marked on the surface of the test piece with a simple configuration.

[0011] In this case, the mounting portion has a first mounting hole and a second mounting hole which are aligned along the extension direction of the base portion and penetrate in the vertical direction, and the stamping tool has a first stamping tool which is removably attached to the first mounting hole and a second stamping tool which is attached to the second mounting hole, and it is preferable that the first stamping tool and the second stamping tool are each an autopunch. With the above configuration, the mark is stamped by the auto punch, so the mark can be stamped safely and easily. In addition, since the auto punch is detachable, a commercially available punch can be used as is. Therefore, there is no need to manufacture a punch dedicated to the device, and manufacturing costs can be reduced.

[0012] In this case, the mounting portion has a first mounting hole, a second mounting hole, and a third mounting hole that are aligned along the extension direction of the base portion and penetrate in the vertical direction, and the stamping tool has a first stamping tool that is removably attached to the first mounting hole, and a second stamping tool that is removably attached to the second mounting hole or the third mounting hole, and the second mounting hole and the third mounting hole have the same shape and preferably overlap partially when viewed from above. With the above-mentioned configuration, even when marking specimens of different lengths, the marking position can be easily changed by simply attaching the marking tool to a different mounting hole. Therefore, with a simple configuration, it is possible to mark the reference point on the surface of the specimen with high accuracy.

[0013] In this case, the support portion may extend along the extension direction of the base portion, and a support groove having a V-shaped cross section may be formed on an upper surface of the support portion. With the above-described configuration, the position of the test specimen in the width direction can be fixed by the support groove with a V-shaped cross section.

[0014] In this case, a through hole that penetrates in the vertical direction is formed in the mounting portion at a position above the support portion, and the fixing portion is a fixing screw that extends in the vertical direction, is screwed into the through hole, moves in the vertical direction relative to the mounting portion, and presses the test specimen supported by the support portion from above. With the above-described configuration, the vertical position of the test specimen is fixed by the fixing screws, so that the test specimen can be easily fixed with a simple configuration.

[0015] In this case, the marking device is used to mark a plurality of markings on the surface of the threaded portion of the test piece having a cylindrical threaded portion, and the support portion may support the threaded portion of the test piece from below. With the above-described configuration, the support portion can support from below the screw portion that is stamped from above, thereby making it possible to stably support the test piece. Effect of the Invention

[0016] According to the mark-stamping device of the present invention, a mark can be stamped on the surface of a test piece with high accuracy using a simple configuration. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a perspective view of the marking device and a test specimen. [Diagram 2] FIG. 2 is a side view of the marking device and the test specimen. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a top view of the marking device with the auto punch removed. [Figure 6] FIG. 2 is a rear view of the marking device with the auto punch removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. This embodiment relates to a reference mark stamping device for stamping multiple reference marks on the surface of a long test piece, and relates to a "reference mark stamping device" that has a simple configuration and can stamp reference marks on the surface of the test piece with high precision. In the following description, as shown in Figure 1, the "vertical direction" refers to the vertical direction when the marking device is installed on the workbench. The "front-rear direction" refers to the length direction of the marking device and the axial direction of the test piece. The "left-right direction" refers to the direction perpendicular to the "vertical direction" and "front-rear direction", and refers to the width direction of the marking device and the width direction of the test piece.

[0019] <Marking device> The reference mark marking device 1 of this embodiment is a device for marking a plurality of reference marks P on the surface of a long test piece T, as shown in FIGS. Specifically, the marking device 1 is used to mark two marks P (a first mark P1 and a second mark P2) on the outer peripheral surface of a threaded portion T1 of a cylindrical test piece T.

[0020] Here, the test specimen T to be stamped will be described in detail. As shown in FIG. 3, the test specimen T is used, for example, in a tensile test of a turnbuckle, and has a cylindrical threaded portion T1 on which a gauge point P is stamped, and a cylindrical holding portion T2 that holds the threaded portion T1. A male thread T1a is formed on a part of the outer circumferential surface of the threaded portion T1. A female thread T2a that screws with the male thread T1a is formed inside the cylindrical holding portion T2. ​​The test specimen T is configured by screwing two threaded portions T1 into both ends of the cylindrical holding portion T2. On a test specimen T used for a tensile test of a turnbuckle, a first reference point P1 is stamped at a position 40 mm from the thread machining start point O1 on the thread portion T1, and a second reference point P2 is stamped at a position 5 mm from the thread machining end point O2 on the thread portion T1. Two reference points P are stamped on the surface of each screw portion T1 of the test piece T, and two reference points P are also stamped on the surface opposite to the surface. Note that the number and positions of the stamped reference points P are not limited to this.

[0021] As shown in Figs. 1 and 2, the marking device 1 marks two marks P on the surface of the threaded portion T1 of a test piece T having a threaded portion T1 and a cylindrical holding portion T2. The reference point stamping device 1 includes a base 2 that supports the test piece T from below, and a stamping tool 3 that is detachably attached to the base 2 and stamps two reference points P from above on the surface of the test piece T. The stamping tool 3 has a first stamping tool 3A that stamps a first reference point P1, and a second stamping tool 3B that stamps a second reference point P2.

[0022] <Base> As shown in Figures 1, 2, and 4 to 6, the base 2 has a base portion 10 extending horizontally (front-to-back), a support portion 20 that supports the test piece T from below, an attachment portion 30 for attaching the stamping tool 3, a fixing portion 40 that fixes the test piece T from above, and a positioning portion 50 that determines the position of the test piece T in the axial direction.

[0023] The position of the test piece T in the width direction (left-right direction) is determined by the support part 20. The position of the test piece T in the up-down direction is determined by the fixing part 40. The position of the test piece T in the axial direction (front-back direction) is determined by the positioning part 50. In this way, the reference point stamping device 1 holds the test piece T from each direction by the support unit 20, the fixing unit 40, and the positioning unit 50, and can stamp the surface of the test piece T with high precision. In particular, even if the surface to be stamped is not flat, the surface of the test piece T can be stamped with high precision by holding the test piece T from each direction.

[0024] 1, 2, and 4 to 6, the base portion 10 is a long plate-like member for attaching the support portion 20, the attachment portion 30, and the positioning portion 50. The base portion 10 extends in the front-rear direction along the axial direction of the test piece T. The support portion 20 and the attachment portion 30 are attached to the rear end portion 11 side of the base portion 10, and the positioning portion 50 is attached to the front end portion 12 side.

[0025] 1 and 2, the support part 20 is a long member that supports the test piece T from below. The support part 20 is attached to the rear end part 11 side of the base part 10, and extends along the extension direction of the base part 10. Specifically, the support part 20 extends in the front-rear direction along the axial direction of the test piece T, and supports the screw part T1 of the test piece T from below. In this embodiment, the support portion 20 is configured as a single long member, but a configuration in which a plurality of support portions 20 support the test piece T from below may also be used.

[0026] 4 to 6, a support groove 20a having a V-shaped cross section is formed in the upper surface, which serves as the support surface, of the support part 20 and extends in the extension direction of the support part 20. The test piece T is placed on the support groove 20a, and the fixing part 40 is pressed against it from above, thereby fixing the position in the left-right and up-down directions.

[0027] 1 and 2, the mounting part 30 is provided at an upper position of the support part 20, and is a member for mounting the stamp tool 3. The mounting part 30 is attached to the rear end part 11 side of the base part 10, and extends in the front-rear direction along the axial direction of the test piece T. As shown in Figures 4 to 6, the mounting portion 30 has a first wall portion 31 that stands upward from the rear end portion 11 of the base portion 10, a second wall portion 32 that stands upward from the central portion in the extension direction of the base portion 10, an intermediate mounting portion 33 that is attached to the middle portion in the up-down direction of the first wall portion 31 and the second wall portion 32, and a top plate mounting portion 34 that is attached to the upper ends of the first wall portion 31 and the second wall portion 32.

[0028] The first wall portion 31 is a plate-like member that is long in the vertical direction, and is attached to the rear end portion 11 of the base portion 10 by a fastener such as a bolt. A first insertion hole 31a for inserting the test body T is formed in a lower portion of the first wall portion 31. The first insertion hole 31a penetrates in the front-rear direction, and allows the test body T to be inserted in the front-rear direction.

[0029] The second wall portion 32 is a plate-like member that is long in the vertical direction, and is attached to the center portion of the base portion 10 in the extension direction by a fastener such as a bolt. A second insertion hole 32a for inserting the test body T is formed in a lower portion of the second wall portion 32. The second insertion hole 32a penetrates in the front-rear direction, and allows the test body T to be inserted in the front-rear direction.

[0030] 2, the first insertion hole 31a is formed to be larger than the second insertion hole 32a. Specifically, the first insertion hole 31a is formed to a size that allows the threaded portion T1 and the cylindrical holding portion T2 of the test piece T to be inserted therethrough. The second insertion hole 32a is formed to a size that allows the threaded portion T1 of the test piece T to be inserted therethrough. The test piece T is inserted forward in the length direction of the mark-stamping device 1 from the first insertion hole 31 a, passes through the second insertion hole 32 a, and comes into contact with the positioning portion 50.

[0031] As shown in Figs. 1 and 2, the intermediate mounting portion 33 is a plate-like member that is long in the front-rear direction, and is attached to the vertical intermediate portions of the first wall portion 31 and the second wall portion 32 by fasteners such as bolts. The intermediate mounting portion 33 has a plurality of mounting holes 35 for mounting the stamping tool 3, and a through hole 36 for mounting the fixing portion 40. The plurality of mounting holes 35 and the through holes 36 are provided at a position above the support portion 20. Furthermore, the plurality of mounting holes 35 and the through holes 36 are formed at positions that overlap with the test piece T in the up-down direction when the test piece T is placed on the support portion 20.

[0032] Specifically, the intermediate mounting portion 33 is formed with a first mounting hole 35a, a second mounting hole 35b, and a third mounting hole 35c that are aligned along the axial direction (front-to-back direction) of the test piece T and penetrate in the up-down direction. A through hole 36 that penetrates in the up-down direction is formed between the first mounting hole 35a and the second mounting hole 35b in the front-rear direction of the intermediate mounting portion 33. As shown in Fig. 4, a female thread portion 36a that screws into the male thread portion 40a of the fixing portion 40 is formed on the inner circumferential surface of the through hole 36.

[0033] 5, the first mounting hole 35a, the second mounting hole 35b, and the third mounting hole 35c have the same shape. Specifically, the first mounting hole 35a, the second mounting hole 35b, and the third mounting hole 35c are each circular and formed to a size that allows the stamp tool 3 to be inserted and held therein. In addition, the second mounting hole 35b and the third mounting hole 35c are formed to overlap in a top view. In other words, the second mounting hole 35b and the third mounting hole 35c have a gourd shape in a top view. When the second stamping tool 3B is inserted into either the second mounting hole 35b or the third mounting hole 35c, the intermediate mounting part 33 can hold the second stamping tool 3B vertically.

[0034] The number and positions of the multiple mounting holes 35 formed in the intermediate mounting portion 33 can be changed as appropriate depending on the stamping position of the test piece T. The size and shape of the multiple mounting holes 35 can be changed as appropriate depending on the size and shape of the stamping tool 3 to be attached.

[0035] As shown in Figs. 1 and 2, the top plate attachment portion 34 is a plate-like member that is long in the front-rear direction, and is attached to the upper ends of the first wall portion 31 and the second wall portion 32 by fasteners such as bolts. The top plate mounting portion 34 has a plurality of upper mounting holes 37 for mounting the stamping tool 3, and an upper through hole 38 for mounting the fixing portion 40. The plurality of upper mounting holes 37 and the upper through hole 38 are provided at positions above the support portion 20 and the intermediate mounting portion 33. In addition, the plurality of upper mounting holes 37 and the upper through hole 38 are formed at positions that overlap with the test piece T in the vertical direction when the test piece T is placed on the support portion 20.

[0036] Specifically, the top plate mounting portion 34 is formed with a first upper mounting hole 37a, a second upper mounting hole 37b, and a third upper mounting hole 37c that are aligned along the axial direction (front-to-back direction) of the test piece T and penetrate in the vertical direction. Here, the first upper mounting hole 37a, the second upper mounting hole 37b, and the third upper mounting hole 37c have the same shapes as the first mounting hole 35a, the second mounting hole 35b, and the third mounting hole 35c, respectively. The first upper mounting hole 37a, the second upper mounting hole 37b, and the third upper mounting hole 37c are disposed at positions overlapping the first mounting hole 35a, the second mounting hole 35b, and the third mounting hole 35c, respectively, in the up-down direction.

[0037] An upper through hole 38 that penetrates in the up-down direction is formed between the first upper mounting hole 37a and the second upper mounting hole 37b in the front-rear direction of the top plate mounting portion 34. The upper through hole 38 is disposed at a position that overlaps with the through hole 36 in the up-down direction. As shown in FIG. 4, the hole diameter of the upper through hole 38 is formed to be larger than the diameter of the male screw portion 40a of the fixing portion 40.

[0038] In this manner, the mounting portion 30 can hold the stamp tool 3 more stably by inserting the stamp tool 3 into the mounting hole 35 and the upper mounting hole 37 . Similar to the mounting hole 35, the number and positions of the multiple upper mounting holes 37 formed in the top plate mounting portion 34 can be changed as appropriate depending on the stamping position of the test piece T. Similarly to the mounting hole 35, the size and shape of the multiple upper mounting holes 37 can be changed as appropriate depending on the size and shape of the stamping tool 3 to be attached.

[0039] In this embodiment, the fixing portion 40 is configured to screw into the through hole 36 of the intermediate mounting portion 33, but it may also be configured to screw into the upper through hole 38 of the top plate mounting portion 34, or it may be configured to screw into both the through hole 36 and the upper through hole 38. Furthermore, as long as the stamp tool 3 can be stably held, the stamp tool 3 may be held by only one of the intermediate attachment portion 33 and the top plate attachment portion 34 .

[0040] 1 and 2, the fixing part 40 is a member that fixes the test piece T supported by the support part 20 from above, and is attached to the mounting part 30. Specifically, the fixing part 40 is a fixing screw that extends in the vertical direction, and is screwed into the through hole 36 formed in the intermediate mounting part 33 of the mounting part 30. 4, a male thread portion 40a is formed on the outer circumferential surface of the fixing portion 40. The male thread portion 40a is screwed into the female thread portion 36a of the through hole 36.

[0041] 2, the fixing part 40 moves in the vertical direction relative to the attachment part 30. Then, the lower end surface 40b of the fixing part 40 presses the surface of the test piece T supported by the support part 20 from above. Therefore, an operator can easily fix the test specimen T supported by the support part 20 from above by rotating the fixing part 40 and moving it downward relative to the intermediate mounting part 33. In this way, the vertical position of the test specimen T is fixed by the fixing screw, so that the test specimen T can be fixed with a simple structure.

[0042] 1 and 2, the positioning part 50 is a member for determining the position of the test piece T in the axial direction, and is disposed at a lateral position of the support part 20 in the extension direction of the base part 10. Specifically, the positioning part 50 is provided at the front end part 12 of the base part 10, and abuts against a front end part T1b (one end part) of the test piece T supported by the support part 20. As shown in FIG. 4, the positioning portion 50 has a mounting wall portion 51 standing upward from the front end portion 12 of the base portion 10, and an adjustment screw 52 movably attached to the mounting wall portion 51.

[0043] The mounting wall portion 51 is a plate-like member that is long in the left-right direction, and is attached to the front end portion 12 of the base portion 10 by fasteners such as bolts. A screw hole 51a for mounting the adjustment screw 52 so as to be movable in the front-rear direction is formed in the center of the mounting wall 51. The screw hole 51a penetrates in the front-rear direction and screws into a threaded portion 52a of the adjustment screw 52, ​​allowing the adjustment screw 52 to move in the front-rear direction.

[0044] The positioning unit 50 moves in the front-rear direction relative to the support unit 20, and is capable of adjusting the axial position of the test piece T supported by the support unit 20. For example, from a state in which a tip surface 52b of the adjustment screw 52 abuts against a front end portion T1b of the test piece T supported by the support unit 20, the adjustment screw 52 is moved rearward relative to the mounting wall portion 51. Then, with the test piece T supported by the support unit 20, the tip surface 52b of the adjustment screw 52 presses against and moves the front end portion T1b of the test piece T, thereby fine-adjusting the stamping position.

[0045] In this way, the axial position of the test piece T can be easily determined by the positioning part 50. In addition, by moving the adjustment screw 52 of the positioning part 50 while the test piece T is supported by the support part 20, the axial position of the test piece T can be finely adjusted. The axial position of the test piece T is determined by the front end T1b abutting against the tip face 52b of the adjustment screw 52, ​​but may also be determined by the front end face T2b of the cylindrical holding portion T2 of the test piece T abutting against the rear end face 20b of the support portion 20.

[0046] <Stamping tool> As shown in Figure 4, the stamping tool 3 is a punch that is removably attached to the base 2, and has a first stamping tool 3A that is removably attached to the first mounting hole 35a and the first upper mounting hole 37a, and a second stamping tool 3B that is attached to the second mounting hole 35b and the second upper mounting hole 37b. The first stamping tool 3A and the second stamping tool 3B are each an autopunch. The autopunch is a known automatic punch, and has a gripping part 3a that is held by an operator, a main body part 3b having an elastic spring therein, and a tapping part 3c that taps the test piece T. The stamping tool 3 is fitted into the mounting hole 35 and the upper mounting hole 37, and is held by a retaining ring 3d that holds the periphery of the main body part 3b.

[0047] When an operator applies a predetermined force to the gripping portion 3a, the force of an elastic spring (not shown) of the main body portion 3b causes the tapping portion 3c to tap the test piece T, and the reference point P is stamped on the surface of the test piece T. Note that the stamping tool 3 is not limited to an automatic punch, and may be a manual punch in which the operator uses a hammer to strike the tapping portion 3c to stamp the test piece T.

[0048] In this embodiment, the first stamping tool 3A is detachably attached to the first mounting hole 35a, and the second stamping tool 3B is detachably attached to either the second mounting hole 35b or the third mounting hole 35c. Therefore, the stamping position can be easily changed by attaching the second stamping tool 3B to the second mounting hole 35b or the third mounting hole 35c depending on the length (stamping position) of the test piece T. Therefore, the reference point P can be easily stamped on the test piece T with high accuracy using a simple configuration. The number of stamping tools 3 may be one, or three or more. Also, the stamping tool 3 may be fixed to the attachment portion 30.

[0049] With the above-described configuration, the axial position of the test piece T can be easily determined by the positioning unit 50, and the axial position of the test piece T can be fine-tuned by moving the adjustment screw 52 of the positioning unit 50 while the test piece T is supported by the support unit 20. Since the marking position can be easily adjusted by moving the positioning unit 50, the reference point P can be accurately marked on the surface of the test piece T with a simple configuration.

[0050] In the above embodiment, the marking device according to the present invention has been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof. In particular, the above-described embodiment is merely an example and does not limit the present invention. [Explanation of symbols]

[0051] 1 Marking device 2 Base 3 Stamping tool 3A First stamping tool 3B Second stamping tool 3a Gripping part 3b Main body 3c Hitting section 3d retaining ring 10 Base 11 Rear end 12 Front end 20 Support part 20a support groove 20b Rear end surface 30 Mounting part 31 First wall 31a First insertion hole 32 Second wall section 32a Second insertion hole 33 Intermediate mounting part 34 Top plate attachment part 35 Mounting hole 35a First mounting hole 35b Second mounting hole 35c Third mounting hole 36 Through hole 36a Female thread 37 Upper mounting hole 37a First upper mounting hole 37b Second upper mounting hole 37c Third upper mounting hole 38 Upper through hole 40 Fixed part 40a Male thread 40b Bottom end surface 50 Positioning part 51 Mounting wall 51a screw hole 52 Adjustment screw 52a Screw part 52b Tip surface T test specimen T1 Threaded Part T1a male thread T1b front end T2 Cylinder holder T2a female thread T2b front end surface P gauge P1 First gauge point P2 Second gauge point O1 Thread machining start point O2 Thread Machining End Point

Claims

1. A marking device for marking a plurality of marks on a surface of a long test piece, comprising: A base that supports the test specimen from below; a marking tool attached to the base and marking the reference point on the surface of the test piece from above; The base is A base portion extending along a horizontal direction; A support portion attached to the base portion and supporting the test specimen from below; an attachment portion provided above the support portion and for attaching the stamping tool; a positioning portion that is disposed at a side of the support portion in the extending direction of the base portion, and abuts against one end of the test body supported by the support portion in the axial direction to determine a position of the test body in the axial direction; a fixing portion provided on the mounting portion and configured to fix the test body supported by the support portion from above, The positioning portion is movable in the extension direction relative to the support portion, and is capable of adjusting the position of the test piece supported by the support portion in the axial direction.

2. The mounting portion is formed with a first mounting hole and a second mounting hole that are aligned along the extension direction of the base portion and penetrate in a vertical direction, The stamping tool includes a first stamping tool that is detachably attached to the first mounting hole and a second stamping tool that is attached to the second mounting hole, 2. The marking device according to claim 1, wherein the first marking tool and the second marking tool are each an auto punch.

3. The mounting portion is formed with a first mounting hole, a second mounting hole, and a third mounting hole which are aligned along the extension direction of the base portion and penetrate in a vertical direction, the stamping tool includes a first stamping tool that is detachably attached to the first mounting hole, and a second stamping tool that is detachably attached to the second mounting hole or the third mounting hole, 2. The marking device according to claim 1, wherein the second mounting hole and the third mounting hole have the same shape and partially overlap each other in a top view.

4. The support portion extends along the extension direction of the base portion, 3. The marking device according to claim 1, wherein a support groove having a V-shaped cross section is formed on an upper surface of the support portion.

5. a through hole is formed in the mounting portion above the support portion, the through hole penetrating the mounting portion in the up-down direction; The marking device according to claim 1 or 2, characterized in that the fixing portion is a fixing screw extending in the vertical direction, screwed into the through hole, moves in the vertical direction relative to the mounting portion, and presses the test piece supported by the support portion from above.

6. the marking device is used to mark a plurality of the marks on a surface of the threaded portion of the test piece having a cylindrical threaded portion, 3. The marking device according to claim 1, wherein the support portion supports the threaded portion of the test piece from below.

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