JP3113513U - Tensile testing machine - Google Patents

Abstract

An object of the present invention is to improve a decrease in reliability of a tensile test result due to an increase in axial center alignment work time due to trial and error of a tensile tester and a decrease in accuracy of axial center alignment work due to individual differences among workers.
A tension screw 12 is inserted into a grip body 1N and screwed to a face 14b. Next, the face 14a is inserted, the spacer 13 prepared according to the sample thickness is inserted between the grip body 1N and the face 14b, and the face 14b is pushed to the right in the drawing by the rotation of the tension screw 12, thereby the spacer 13, after fixing the grip screw 1N to the grip body 1N and inserting the sample 5 from below, the push screw 3N is rotated and the face 14a is pushed rightward so that the sample 5 is clamped and fixed. The push screw 3N is fixed with the ring 3NR.
[Selection] Figure 2

Description

  The present invention relates to a tensile testing machine for measuring the tensile strength of a solid material.

  The main elements of a conventional grip for a tensile testing machine are, for example, a grip body, a pair of faces for holding a specimen in contact with a test piece (hereinafter referred to as a specimen), and a plurality of faces for fixing the face to the grip body. It consists of fixed screws. When sandwiching the sample, the sample is inserted between the faces, and the center of the sample thickness (hereinafter referred to as sample thickness) is aligned with the center position of the grip body (hereinafter referred to as axial alignment). That is, the sample is clamped while visually adjusting the positional relationship of the face according to the sample thickness, and the result of the axial center alignment is confirmed with a caliper or the like. If the axial alignment is insufficient, bending and torsional stress is applied to the sample, and correct measurement results cannot be obtained. Therefore, it is necessary to perform a test after confirming completion of axial alignment.

  Hereinafter, the structure of the grip part of the conventional tensile testing machine will be described with reference to FIGS. 3 (A) and 3 (B). 3A is a cross-sectional view of the grip portion, and FIG. 3B is a perspective view of the grip portion. Two grip parts are used, one for each of the upper and lower ends of the sample, and the sample is sandwiched between them. FIG. 3 shows the upper grip. Since the upper and lower grip portions have a similar structure except that they are vertically symmetric, only the upper grip portion will be described below. Reference numeral 1 denotes a grip body, which is suspended from a tensile tester body (not shown) through a fixing port H. As shown in FIG. 3B, the grip body 1 has a total of six screw screw insertion holes 2 that are threaded, and a total of six screw screws are inserted into each screw screw insertion port 2. 3 is screwed.

  Reference numeral 5 denotes a sample, and a dumbbell-shaped test piece in accordance with JIS standards is usually used. In the JIS standard, for example, the sample thickness of the sample 5 is usually in the range of 1 to 4 mm. The sample 5 is clamped to the grip body 1 through the face 4a and the face 4b by the screwing of the push screw 3. When the sample 5 is sandwiched, as already described, the sample thickness is first measured, and the axial center alignment is performed visually according to the sample thickness. First, the position of the face 4a is determined by screwing in the three push screws 3 on the left side of FIG. 3, the sample 5 and the face 4b are arranged, and the three pieces on the right side of the drawing are applied to the sample 5 with hand pressure. The sample screw 5 is inserted and the sample 5 is clamped, and coincidence with the axial center position is confirmed with a caliper or the like. If the axial alignment is not sufficient, the above clamping process is repeated again. After matching to the axial center position is confirmed, the tensile test is started. For example, Patent Document 1 describes an example of a conventional gripping tool.

JP-A-10-170418

  The structure of the conventional tensile testing machine is as described above. However, this structure has poor accuracy of alignment of the shaft center, requires a long time for alignment work, and decreases the reliability of the test results. That is, as described above, when sandwiching the sample, the sample thickness is measured first, and the approximate positions of the three push screws on one side are first determined visually to match the sample thickness, and the face, sample, and other face of the one side direction are determined. The parts are arranged in order, and while the surface pressure is applied to the sample by hand, the other three push screws are rotated to extrude the other face to pinch the sample, and then the holding position is measured with a ruler or the like. If the result of axial alignment is insufficient, loosen the six push screws once and remove the sample, and then rotate the push screw as necessary to adjust the mutual position of the face and pinch the sample again. Measure the position with calipers.

  This operation is repeated by trial and error until the center of the sample thickness matches the axial center position within a predetermined error range, but usually several trials and errors are required until the alignment operation is completed. The time required for the alignment work was increased. Although the standard of the error range is determined in advance, there are uncertainties and individual differences between workers in the field measurement and judgment of conformity, reducing the reliability of the test results. An object of the present invention is to provide means for solving such problems.

  In order to solve the above-mentioned problems, the tensile tester provided by the present invention comprises a fixing means for fixing the sample and the face to the grip body by a push screw and a tensile screw. In addition, a spacer is provided which is inserted into a gap between the face and the inner wall of the grip body to ensure a gap distance.

  It becomes possible to easily match the center of the sample thickness with the axial center position. For example, according to an implementation result, the time required for the alignment operation is shortened to about one-tenth of the conventional time by using a tension screw and selectively using any of several kinds of spacers prepared in advance. In addition, axial alignment can be performed without individual differences among workers, and the reliability of test results is improved.

  The tensile tester provided by the present invention has the following features. The first feature is that the fixing means for fixing the sample and the face to the grip body is composed of a push screw and a tension screw. The second feature is that a spacer is provided which is inserted into the gap between the face and the inner wall of the grip body to ensure the distance between the gaps. Therefore, the basic configuration of the best mode is that the fixing means for fixing the sample and the face to the grip body is composed of a push screw and a tension screw, and it is inserted in the gap between the face and the inner wall of the grip body to ensure the gap distance It is a tensile testing machine provided with a spacer.

  This will be described with reference to the illustrated example. 1 (A), (B), (C) and (D) are cross-sectional views of the first embodiment of the present invention and diagrams showing the structure of main components. In FIG. 1, the structure and operation of components having the same reference numerals as in FIG. 3 are the same as those in FIG. The grip body 1N holds the sample 5 in combination with the face 14a and the face 14b. A through hole 11 and a screw hole for screwing the push screw 3N are formed in the left side surface of FIG. ing. The through hole 11 passes through the grip body 1N to the right side. Further, a circular hole is formed continuously from the screw hole, and the circular hole reaches the central space of the grip body 1N. A circular hole for inserting the tension screw 12 and the through hole 11 are formed on the right side surface. FIG. 1B is a structural diagram of the push screw 3N, and a side view of the push screw 3N is shown on the right side of the alternate long and short dash line. The push screw 3N includes a push screw main body 3NB and a fixing ring 3NR, and the outer surface of the push screw main body 3NB is threaded to be screwed with the grip main body 1N and the fixing ring 3NR. A central hole 3NH is formed in the shaft center portion. The central hole 3NH is used for confirming the close contact between the push screw 3N and the face 14a as necessary, and for inserting an auxiliary tool when the push screw 3N and the face 14a are removed. The inner surface of the fixing ring 3NR is threaded to be screwed with the outer surface of the push screw main body 3NB, and an auxiliary tool is provided at several places on the outer peripheral surface as necessary when rotating or fixing. A small hole (not shown) is formed for fitting. The left portion of the alternate long and short dash line in FIG. 1B is a view of the side view as viewed from the left. As shown in the figure, a hexagonal cut process for inserting an L-shaped hexagonal spanner tool is performed at the end of the central hole 3NH when necessary.

  FIG. 1C is a structural diagram of the face 14b. The face 14b is provided with a screw portion 14S protruding from the back side of the face. Further, a through hole 14F is formed. The through hole 14F is drilled at a position where the axial center of the face 14b coincides with the through hole 11 when the face 14b is incorporated into the grip body 1N. The faces 14a and 14b have a substantially symmetrical structure, but differ in the presence or absence of screws. FIG. 1D is a structural diagram of the tension screw 12, in which the left portion of the alternate long and short dash line is a side view, and the right portion is a view of the side view as viewed from the right. A tip screw portion 12S for screwing into the screw portion 14S of the face 14b is provided at the left tip of the side view.

  The assembly procedure is as follows. First, the tension screw 12 is inserted into the grip body 1N, then the face 14b is inserted from below in FIG. 1A, and the tip screw portion 12S of the tension screw 12 is screwed into the screw portion 14S of the face 14b. Enter. Next, the face 14b is moved to the right in FIG. 1A, the face 14a is inserted, and the protruding portion corresponding to the screw portion 14S is inserted into the left inner wall of the grip body 1N. Thereafter, by using a through-hole 11, a through-hole 14F, and a through-rod (not shown) penetrating the through-hole 11 as necessary, deviation of the face 14a and the face 14b from the grip body 1N is prevented. Thereafter, the tension screw 12 is rotated to return the face 14b to the center direction, and is stopped at a position where the center position of the sample 5 is predicted to be the axial center position according to the thickness of the sample 5.

  Next, the push screw 3N is screwed onto the grip body 1N, the sample 5 is inserted from below, the push screw 3N is rotated, the face 14a is screwed to the right, the sample 5 is clamped, and the push screw is pushed by the fixing ring 3NR. 3N is fixed.

  FIGS. 2A and 2B are a cross-sectional view of the second embodiment of the present invention and a diagram showing the structure of main components. In FIG. 2, the structure and operation of components having the same reference numerals as those in FIGS. 1 and 3 are the same as those in FIGS. The grip body 1N holds the sample 5 in combination with the face 14a and the face 14b, and the spacer 13 is inserted between the grip body 1N and the face 14b to determine the position of the face 14b. Several types of spacers 13 are prepared according to the sample thickness of the sample 5. For example, the standard sample thickness is 1, 1.5, 2 and 3 mm, the thickness of the faces 14a and 14b (excluding the protruding portion of the screw portion 14S) is 5 mm, and the distance of the concave space L at the center of the grip body 1N. If the left and right are 16 mm, in order to place the center position of the sample thickness of the sample 5 at the axial center position, four types of spacers 13 of 2.5, 2.25, 2, and 1.5 mm are prepared. deep.

  In the assembling procedure, first, the tension screw 12 is inserted into the grip body 1N and screwed into the screw portion 14S of the face 14b inserted from below in FIG. Next, the face 14b is moved to the right side of the figure, the face 14a is inserted, and the protruding portion corresponding to the screw portion 14S is inserted into the left inner wall of the grip body 1N. Thereafter, by using a through-hole 11, a through-hole 14F, and a through-rod (not shown) penetrating the through-hole 11 as necessary, deviation of the face 14a and the face 14b from the grip body 1N is prevented.

  Next, the tension screw 12 is rotated to return the face 14b to the center direction, and a spacer 13 prepared according to the sample thickness is inserted between the grip body 1N and the face 14b, and the face 14b is rotated by the rotation of the tension screw 12. Move to the right again and stop at the position where the spacer 13 does not fall off. Further, a push screw 3N is screwed onto the grip body 1N, the sample 5 is inserted from below, the push screw 3N is rotated, the face 14a is pushed to the right to clamp the sample 5, and the push screw 3N is fixed by the fixing ring 3NR. To do. By this procedure, the center position of the sample thickness is automatically fixed at the axial center position. In principle, the spacer 13 is not required in the gap between the face 14a and the grip body 1N, but if necessary, a dummy spacer having the same thickness as the spacer 13 inserted between the grip body 1N and the face 14b is used as a correct spacer. 13 can be used as a jig for checking whether or not 13 is used. If the thickness of the dummy spacer matches the distance between the face 14a and the inner wall of the grip body 1N, it is confirmed that the spacer 13 having the correct thickness is used.

  The present invention is not limited to the above-described embodiments, and various modifications can be given. For example, the shape of the grip body 1N is not limited to the first and second embodiments, and various shapes can be used. The same applies to the parts such as the faces 14a and 14b and the spacer 13, and the fixing means for fixing the sample and the face to the grip body is constituted by a push screw and a tension screw. If the spacer is inserted in the gap between the inner walls of the grip body and is provided with a spacer for ensuring the distance of the gap, the present invention includes all of them regardless of the shape of the components.

  The present invention can be applied to a tensile testing machine that measures the tensile strength of a solid material.

It is a figure which shows the structure of the 1st Example of this invention. It is a figure which shows the structure of the 2nd Example of this invention. It is a figure which shows the structure of the conventional grip part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grip main body 1N Grip main body 2 Push screw insertion port 3 Push screw 3N Push screw 3NB Push screw main body 3NH Center hole 3NR Fixing ring 4a Face 4b Face 11 Through hole 12 Tensile screw 12S Tip screw part 13 Spacer 14a Face 14b Face 14F Through hole 14S Screw part

Claims (2)

  The grip body has two faces that are locked at the tips of the two screws that are inserted from both sides, respectively, and both faces are moved forward and backward with respect to the test piece between both faces to hold the test piece. Alternatively, in the test grip to be opened, one screw is screwed to the face and operated to retract the face from the test piece, and the other screw is operated to press the face against the test piece. A grip for testing.   2. The test grip according to claim 1, wherein a spacer for adjusting a distance between the face retreated from the test piece and the grip body is interposed.

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