JP2011226807A - Gauge length marking-off tool of tension test piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gauge length marking-off tool capable of adding only required marking-off line quickly at a proper position when a marking-off line defining the gauge length is added to a test piece.SOLUTION: A gauge length marking-off tool comprises: a pair of test piece holding members 2a and 2b having holding parts 2a-2, 2b-2, 2a-3 and 2b-3 to hold shoulder parts of test pieces S1 and S2 and to be fixed on an upper surface of a pedestal formed into a flat surface; a gauge length regulating plate 4 having opposing lateral sides 4a and 4b formed in parallel with a space equal to the gauge length of the test piece; and a portal bearing member 3 arranged over the pair of test piece holding members 2a and 2b. The gauge length regulating plate 4 is supported by the bearing member 3 through a rotation shaft 5 and moves up/down to the vertical direction without rotating horizontally by rotating the rotation shaft 5. The gauge length regulating plate 4 moves down by rotating the rotation shaft 5 and the parallel part of the test piece is sandwiched between the gauge length regulating plate 4 and the upper surface of the pedestal 1 so as to be fixed.

Description

  The present invention is used when a marking line that defines the gauge distance is put on a plate-like tensile test piece (hereinafter referred to as “test piece”) used in a tensile test, which is a method for evaluating the mechanical strength of a metal material. The present invention relates to a jig for marking distance marking.

  In the tensile test, the gripping part of the test piece is gripped with a testing machine, a load is applied in the axial direction, and the tensile distance is measured. Therefore, it is necessary to put a marking line as a standard line on the test piece so that the standard distance as a reference for elongation measurement can be known in advance. Conventionally, the marking line is formed by using a scale for each test piece and measuring a prescribed gage distance, marking once with a punch, and marking along the mark. Therefore, it took time and effort to put a marking line.

  Therefore, as a means for omitting the work of putting a marking line on the test piece, marking is also performed by a method such as printing or stamping. For example, Patent Document 1 discloses a technique for printing a standard line pattern by pressing a standard line stamp having a standard line pattern composed of a combination of a lattice and a circle against a test piece.

  In addition, regarding the production of the test piece itself, when producing one or more kinds of test pieces from a pre-cutting test piece (a strip-shaped plate material, hereinafter referred to as “test material”), the test items and the size of the test piece are measured. In order to secure the processing quality of the test pieces separately after lot knitting, while forcibly aligning the end faces in the width and length directions while vibrating the stacked specimens with an aligning device with a vibrator, Patent Document 2 discloses a technique for performing batch dry cutting in units of lots.

Japanese Utility Model Publication No. Hei 6-42201 JP-A-7-301484

  In the technique of printing a standard line pattern as described in Patent Document 1, the standard pattern printed on the test piece has irregularities, fading, shading, and many grid lines depending on the surface condition of the test piece and the density of the stamp ink. Due to the presence, there is a case where a misreading of a predetermined gage distance occurs.

  In the technique of batch dry cutting in lot units as in Patent Document 2, the test material is cut based on the numerical values of the parallel part length (P) and shoulder radius (R) of the test piece according to JIS standards. Processed. Before this processing, the end face is aligned by an aligning device, but after that, it is sent to a cutting device such as an end mill drill, where it is processed after clamping. Some disturbance may occur on the end face of the specimen. Then, when the gauge distance is determined using a scale with one end face as a reference, the center of the parallel part of the test piece (position where the longitudinal direction of the test piece is divided in two) is different for the test pieces constituting the same lot. This causes variations and errors in the tensile test results.

  The present invention is intended to solve such a problem in the prior art, and the problem is that when a marking line that defines the gauge distance is put on the test piece, only the necessary marking line is placed at an appropriate position. An object of the present invention is to provide a tool for marking distance marking that can be put in quickly.

  The gauge distance marking jig of the present invention is a pair of test piece holding members each having a holding part for holding a shoulder part of a test piece, which is fixed to the upper surface of a pedestal having an upper surface as a plane, and a test point distance of the test piece Opposite sides formed in parallel at equal intervals, and the opposite sides are perpendicular to the longitudinal direction of the parallel part of the test piece held by a pair of test piece holding members and are parallel to each other A gage distance defining plate disposed so as to be positioned above the portion, and a portal-type support member disposed so as to straddle the pair of test piece holding members and fixed to the pair of test piece holding members, The gage distance defining plate is supported by the support member via a rotating shaft, and is provided to move up and down in the vertical direction without rotating horizontally by rotating the rotating shaft, and rotates the rotating shaft. The gauge distance regulation plate Down to, it is characterized in that it has to be fixed across the parallel portion of the test piece by the upper surface of the gauge length regulating plate and the pedestal.

  In this invention, the holding part which hold | maintains the shoulder part of a tensile test piece can be provided in each both sides of a pair of test piece holding member, and two tensile test pieces can be hold | maintained in parallel simultaneously.

  According to the gauge distance marking jig of the present invention, a marking line required for the test piece is obtained by using the gauge distance defining plate as a guide after holding the shoulder portion of the test piece by the pair of test piece holding members. Can be quickly put in the right position. That is, since the marking line is put after holding the shoulder of the test piece, the marking line can be put at an appropriate position of the test piece. In addition, it is not necessary to use a scale or a punch, and the gage distance defining plate is used as a guide, so that only necessary marking lines can be quickly put.

  In addition, the marking line is clearer than that for printing the marked line pattern, and there is no possibility of misreading the predetermined marked point distance.

It is a figure which shows the jig for marking distance markings of this invention, (a) is a top view, (b) is a front view, (c) is a right view. It is a figure which shows the use condition of the jig for gauge distance markings of this invention, (a) is a top view, (b) is a front view. The test piece prescribed | regulated to JISZ2201 is shown, (a) is a 5th test piece, (b) is a top view which shows a 13B test piece.

  Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.

  As the test piece for putting a marking line using the gauge distance marking jig of the present invention, the number 5 test piece and the number 13B test piece specified in JIS Z 2201 shown in FIG. 3 are overwhelmingly large. In the examples, a case where a marking line is put on the No. 5 test piece and the No. 13B test piece will be described. The specifications of the No. 5 test piece and the No. 13B test piece are as shown in Table 1.

  Referring to FIG. 1, a pair of test piece holding members 2 a and 2 b are fixed to an upper surface of a pedestal 1 whose upper surface is a rectangular plane so as to face each other with a gap therebetween. And the gate-shaped support member 3 is arrange | positioned so that a pair of test piece holding member 2a, 2b may be straddled, and the lower end of the standing pillar part 3a, 3a is being fixed to a pair of test piece holding member 2a, 2b. A rectangular gauge distance defining plate 4 is supported by the support member 3 via a rotating shaft 5.

  Hereinafter, although the detailed structure of each member is demonstrated, in FIG.1 and FIG.2 for convenience of explanation, a horizontal direction is called X direction and a vertical direction is called Y direction.

  The pair of test piece holding members 2a and 2b have a so-called boat shape, and are formed such that the opposing side edges 2a-1 and 2b-1 are parallel along the Y direction. The distance in the X direction between the side edges 2a-1 and 2b-1 is equal to the length in the X direction of the gauge distance defining plate 4 (marker distance).

  Further, holding portions 2a-2 and 2b-2 and holding portions 2a-3 and 2b-3 are formed on both sides of the pair of test piece holding members 2a and 2b, respectively. The holding parts 2a-2 and 2b-2 on one side have a shape following the shape of the shoulder part of the No. 5 test piece, and the holding parts 2a-3 and 2b-3 on the other side are the shoulder parts of the No. 13B test piece. It has a shape that follows the shape of That is, the holding parts 2a-2 and 2b-2 on one side are formed in a curved surface having a radius equal to the radius R of the shoulder of the No. 5 test piece, and the holding parts 2a-3 and 2b-3 on the other side are No. 13B test. It is formed in a curved surface having a radius equal to the radius R of the shoulder portion of the piece. And the space | interval of the X direction between holding | maintenance parts 2a-2 and 2b-2 is made equal to the space | interval between the shoulder parts of No. 5 test piece, and the space | interval of the X direction between holding | maintenance parts 2a-3 and 2b-3 is 13B. As shown in FIG. 2 (a), both shoulder portions of the No. 5 test piece S1 are held by the holding portions 2a-2 and 2b-2 as well as the holding portion as shown in FIG. Both the shoulders of the No. 13B test piece S2 can be held by 2a-3 and 2b-3, and the No. 5 test piece S1 and the No. 13B test piece S2 can be held in parallel.

  Thus, by providing the holding parts 2a-2 and 2b-2 and the holding parts 2a-3 and 2b-3 to the pair of test piece holding members 2a and 2b, the test pieces S1 and S2 having different standards are common. It becomes possible to carry out an inscription on the pedestal 1 at a time. In this case, the width of the test piece holding members 2a and 2b in the Y direction is increased so that the opposing long sides of the two test pieces S1 and S2 do not come into contact with each other. It is preferable to form.

  The width of the pedestal 1 in the Y direction is more than the width when the two test pieces S1, S2 are set on the side matching the pair of test piece holding members 2a, 2b. It is also preferable for stable work. Furthermore, in order to perform the marking work stably, a magnet may be provided below the test piece mounting surface (upper surface) of the pedestal 1 to magnetically attach the test piece.

  The gauge distance defining plate 4 has opposing side edges 4a and 4b formed in parallel with an interval equal to the gauge distance of the test piece, and the opposite side edges 4a and 4b are shown in FIG. 2 (a). As described above, the test pieces S1 and S2 held by the pair of test piece holding members 2a and 2b are arranged so as to be perpendicular to the longitudinal direction (X direction) of the parallel portion and above the parallel portion. . Further, the length in the Y direction of the sides 4a and 4b of the gauge distance defining plate 4 is a length that completely crosses the parallel portion of the test pieces S1 and S2 as shown in FIG. It is said. Specifically, the length is obtained by adding the total width of the gripping portions of the test pieces S1 and S2, the separation distance of the test pieces S1 and S2, and the estimated length of margin for the marking work. In addition, it is preferable for stable work to determine the length of the upper surface of the base 1 in the Y direction according to the length of the gauge distance regulating plate 4 in the Y direction.

  The rotating shaft 5 that supports the gauge distance defining plate 4 on the support member 3 is mounted through a through hole provided in the center of the beam portion 3b of the support member 3, and an operation knob 6 is provided at the upper end of the through shaft. It has been. The rotary shaft 5 is rotated by the operation knob 6.

  A male screw portion is provided at an intermediate portion of the rotating shaft 5, and this male screw portion is screwed into a female screw hole provided in the gauge distance regulating plate 4. Further, the lower end portion of the rotating shaft 5 is mounted in a through hole provided in the base 1. As described above, the length in the X direction of the gauge distance defining plate 4 is equal to the distance between the opposing sides 2a-1 and 2b-1 of the pair of test piece holding members 2a and 2b. As shown in FIGS. 1 and 2, the plate 4 is just fitted between the pair of test piece holding members 2a and 2b. Therefore, when the rotary shaft 5 is rotated by the operation knob 6, the gauge distance defining plate 4 does not rotate horizontally but moves up and down in the vertical direction.

  In this embodiment, in order to stably raise and lower the gauge distance defining plate 4, guide shafts 7 are provided on both sides of the rotating shaft 5 between the beam portion 3b of the support member 3 and the base 1, and these guide shafts are provided. A through hole corresponding to 7 is provided in the gauge distance defining plate 4, and a guide shaft 7 is inserted into the through hole to guide the elevation movement of the gauge distance defining plate 4.

  Next, a procedure for marking work using the gauge distance marking jig of this embodiment will be described.

  First, the test pieces S1, S2 are placed on the upper surface of the pedestal 1, and the holding portions 2a-2, 2b-2 and the holding portion 2a-3 on both sides of the pair of test piece holding members 2a, 2b fixed to the upper surface of the pedestal 1. , 2b-3, the shoulders of the test pieces S1 and S2 are matched. In addition, since the space | interval and shape of the X direction of holding | maintenance part 2a-2, 2b-2 and holding | maintenance part 2a-3, 2b-3 of a pair of test piece holding member 2a, 2b are match | combined with JIS specification, it is a test piece. The dimensional accuracy of the test pieces S1 and S2 can be confirmed based on whether or not the shoulder portions of S1 and S2 match the holding portions 2a-2 and 2b-2 and the holding portions 2a-3 and 2b-3.

  After aligning the shoulders of the test pieces S1 and S2 with the holding portions 2a-2 and 2b-2 and the holding portions 2a-3 and 2b-3, the rotary shaft 5 is rotated by the operation knob 6 to define the gauge distance. The plate 4 is lowered and fixed to the upper surface of the pedestal 1 with the parallel portions of the test pieces S1 and S2 sandwiched between the gauge distance defining plate 4 and the upper surface of the pedestal 1.

  After fixing the test pieces S1 and S2 to the upper surface of the pedestal 1, a Y-direction marking line is drawn on the test pieces S1 and S2 using the side edges 4a and 4b in the Y direction of the gauge distance regulating plate 4 as a guide. When the marking line has been drawn, the rotary shaft 5 is rotated in the reverse direction by the operation knob 6 to raise the gauge distance defining plate 4 and take out the test pieces S1 and S2 from the pedestal 1.

  Thus, if the jig for marking distance marking of the present invention is used, marking lines for defining the marking distance can be easily and accurately placed on the test pieces S1 and S2, and many test pieces can be processed in a short time. It becomes possible to do.

  In this embodiment, the No. 5 test piece S1 and the No. 13B test piece S2 are held by the pair of test piece holding members 2a and 2b. However, the arrangement and the holding of the pair of test piece holding members 2a and 2b are also described. By changing the shapes of the parts 2a-2 and 2b-2 and the holding parts 2a-3 and 2b-3, it is possible to hold other test pieces of the JIS standard. The gauge distance can also be changed by changing the length of the gauge distance defining plate 4 in the X direction. In this case, the distance between the pair of test piece holding members 2a and 2b in the X direction is also changed.

1 Base 2a, 2b Test piece holding member 2a-1, 2b-1 Side 2a-2, 2b-2, 2a-3, 2b-3 Holding part 3 Supporting member 3a Standing column part 3b Beam part 4 Gage distance defining plate 4a, 4b Side 5 Rotating shaft 6 Operation knob 7 Guide shaft S1 JIS No. 5 test piece S2 JIS No. 13B test piece

Claims (2)

A pair of test piece holding members fixed to the upper surface of the pedestal with the upper surface as a plane, each having a holding portion for holding the shoulder portion of the tensile test piece;
It has opposing sides formed in parallel with an interval equal to the gauge distance of the tensile test piece, and the opposing sides are in the longitudinal direction of the parallel part of the tensile test piece held by the pair of test piece holding members. A gauge distance defining plate that is vertical and is positioned above the parallel portion;
A gate-shaped support member disposed so as to straddle the pair of test piece holding members, and fixed to the pair of test piece holding members;
The gage distance defining plate is supported by the support member via a rotating shaft, and is provided to move up and down in the vertical direction without rotating horizontally by rotating the rotating shaft,
By rotating the rotating shaft, the gauge distance defining plate is lowered, and the tensile test specimen is fixed by sandwiching the parallel part of the tensile specimen with the gauge distance defining plate and the upper surface of the pedestal. Point distance marking jig.   2. The test point for a tensile test piece according to claim 1, wherein the pair of test piece holding members each have a holding part for holding a shoulder portion of the tensile test piece on both sides, and the two tensile test pieces can be held in parallel. Distance marking tool.

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