JPS58221146A - Attaching structure of test piece - Google Patents

Abstract

PURPOSE:To attach umbendably the axial center of a test piece perpendicularly to the attaching face of a testing machine by attaching the test piece to the attaching face of the testing machine by interposing axial center adjusting members, etc. CONSTITUTION:A test piece having axial center adjusting members formed and interposed by projected part A of the test piece and a recessed part B of the attaching surface of a testing machine is attached so that the test piece is perpendicular to the attaching face of the test machine. As a result, the test piece is not bent and the accuracy of a material test is improved. The same effect can be obtained by forming the rubbing face with the attaching face of the testing machine and that of the test piece.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a structure for attaching a test piece to a testing machine in a testing device for strength and deformation characteristics of various materials.

[Technical background of the invention and its problems]

Conventionally, test pieces used to test the strength and deformation characteristics of various materials by applying loads or displacements in the axial direction or screw direction, or a combination of both, have been used, for example, in Figure 1 or Figure 1. As shown in Figure 2, it is attached to the testing machine.

That is, as shown in FIG.
A 7-lunge 2 having a parallel part 1b and a vertical flat part 1a is provided at both ends of the test machine. Alternatively, as shown in FIG. 2, screw parts 7 with male threads 7a cut on the outer circumferential surface are provided at both ends of the parallel part 6b of the cylindrical test piece 6, and the mounting on the rod 3 can be fixed. It is screwed into the female thread 8a of the tool 8, and fixed in position by the pin 9 to be fixed and installed.

However, with the configuration shown in FIG. If there is no high degree of perpendicularity to the direction of motion and the central axis of rotation, the attached test piece will be tilted.On the other hand, mounting by threading screws as shown in Figure 2 may also cause loosening of the threaded part. Otherwise, the specimen tends to tilt.

The inclination of the test piece as described above causes the test piece to bend when both ends of the test piece are fixed to the respective mounting jigs, but this bending does not affect the resistance to axial or torsional loads or displacements. This becomes a major hindrance when investigating the behavior, and causes errors in the negative yield stress, deformation behavior, fracture stress, etc. of the material and the material property values obtained in the test, significantly reducing the accuracy of the test.

[Purpose of the invention]

The present invention has been developed to solve the above-mentioned conventional drawbacks, and includes an axial center adjustment member interposed between the mounting surface of the testing machine and the mounting surface of the test piece, or between the mounting surface of the testing machine and the test piece. A sliding mating surface is formed on the receiving surface, and the test piece can be taken perpendicular to the axis of the testing machine to avoid bending the test piece, improving the accuracy of material testing. The object of the present invention is to provide a mounting structure for a test piece that allows adjustment of the mounting angle.

[Summary of the invention]

In other words, the present invention provides for fine adjustment by interposing an axis adjustment member between the mounting surface of the testing machine and the mounting surface of the test piece, or by forming a sliding surface between the mounting surface of the testing machine and the mounting surface of the test piece. The present invention relates to a mounting structure for a test piece, characterized in that the test piece is mounted on a testing machine using a member or a sliding surface such that the axis of the test piece is perpendicular to the mounting surface of the testing machine.

The test piece in the present invention is a cylindrical, cylindrical, prismatic, prismatic, etc. test piece used to test the strength and deformation characteristics of various materials, and is attached to a testing machine. A fixing portion having a surface is provided at both ends.

The axis adjustment member and sliding mating surface according to the present invention change the relative position of the mounting surface of the testing machine, that is, the mounting surface for fixing the test piece provided on the testing machine and the mounting surface of the test piece, and This allows the piece to swing about its axis relative to the mounting surface of the testing machine, for example as shown in FIGS. 3 to 16.

In all of these cases, the test piece is a solid cylindrical test piece.

Figures 3 to 1() show that the axial center adjusting member is formed on the mounting surface of the test piece, and in Figures 3 and 4, the axial center adjusting member is formed protruding in the axial direction around the axial center. Approximately spherical convex portion A1 Conical convex portion A protrudes from the center in the axial direction in FIGS. 5 and 6, and a large number of conical convex portions A protrudes from the center in FIGS. The small conical convex part A and the convex part A continuously protruding in an annular shape so as to form concentric circles around the axis in FIGS. 9 and 10 each constitute an axial center adjusting member. These are attached to a conventional testing machine with a flat mounting surface using bolts as in the conventional example shown in Figure 1, but the axis adjustment member, that is, the convex part A gap is formed between the mounting surface and the mounting surface. Therefore, tighten the bolts so that the fine edge of the test piece is perpendicular to the mounting surface of the testing machine, and
In the case K shown in FIG. 10, the tips of the convex portions A can be deformed in a layered manner, and the test piece can be placed in a testing machine with salt 9.

Moreover, FIGS. 11 and 12 show that the axis adjustment member is formed on the mounting surface of the testing machine. That is, a substantially spherical convex portion B protrudes in the axial direction from the center of the mounting surface of the testing machine.
constitutes a fine adjustment member, and a test piece having a conventional flat mounting surface is mounted perpendicularly to the mounting surface of the testing machine, which is axially centered, in the same manner as described above.

FIG. 13 shows an axial center adjusting member formed by a convex portion A formed on the mounting surface of the test piece and a recess portion B formed on the mounting surface of the testing machine. That is, similar to the examples shown in FIGS. 3 and 4, a substantially spherical convex portion A is provided on the mounting surface of the test piece in the axial direction centering on the axial center, and A substantially spherical concave portion B that engages with the convex portion A is provided. Although the curvatures of the convex portion A and the concave portion B may be the same or different, they are constructed so as to form an appropriate gap between the mounting surfaces other than the portions of the convex portion A and the concave portion B. Therefore, similarly to the above, the test piece can be mounted with its axis perpendicular to the mounting surface of the testing machine. Also, Figure 14 shows
Contrary to the configuration example shown in FIG. 13, this figure shows a configuration in which four parts A are formed on the mounting surface of the test piece, and convex parts B and K are formed on the mounting surface of the testing machine.

In Fig. 15, the axis center adjusting part side is composed of a recess A formed in the mounting surface of the test piece, a recess B1 formed in the mounting surface of the testing machine, and a sphere C held between the two recesses. show. That is, approximately spherical recesses A and B are formed in the center of both the mounting surfaces of the test piece and the test machine, respectively, and a sphere C with a diameter that does not fit into both recesses and forms an appropriate gap between the remounting surfaces. and attach the test piece to the testing machine.

Moreover, FIG. 16 shows an example of a configuration in which sliding surfaces are formed on both the mounting surfaces of the test piece and the testing machine. That is, a substantially spherical sliding surface protruding in the axial direction is formed on the mounting surface of the test piece, and a substantially spherical sliding surface 9 that is depressed in the axial direction and can come into sliding contact with the sliding surface is formed on the mounting surface of the testing machine. A mating surface E is formed. Note that the mating surface of the slide 9 and the curvature of E may be the same or different. Since the relative position between the mounting surface of the test piece and the mounting surface of the testing machine can be changed due to the sliding surface and E, the test piece can be mounted with the axis of the test piece orthogonal to the testing machine. Further, contrary to the above configuration example, the mounting surface of the test piece is made into a substantially spherical shape concave in the axial direction, and the mounting surface of the testing machine is made into a substantially spherical shape protruding in the axial direction,
A sliding surface may be formed on each of them.

Although the axis adjustment member and the sliding surface according to the present invention have been illustrated above, it is possible to adjust the inclination of the test piece with respect to the mounting surface of the testing machine by changing the relative position between the mounting surface of the testing machine and the mounting surface of the test piece. It can be anything you can get.

Further, the attachment of the test piece to the testing machine is not limited to the above-mentioned screw (bolt) attachment, but may also be done by various clamping devices, welding, or the like. In addition, in the above-mentioned screw fixing, it is preferable that the screw fixing through hole bored in the fixing part of the test piece has a diameter that allows the fixing bolt to pass through it loosely.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on examples.

Embodiment 1 What is shown in FIGS. 17 to 21 is an example of the configuration example shown in FIG. 13. Reference numeral 10 denotes a cylindrical test piece used in the present invention, with parallel parts 1 at both ends of the cylindrical parallel part io a.
A fixing part 10e in the form of a 7-lunge having a diameter larger than 0c is provided, and the outer end surface of the fixing part 10e, that is, the mounting surface has a flat part 10a perpendicular to the parallel part 10c and a curvature in the axial direction. A substantially spherical convex portion 10b having a shape of 9 is provided,
Furthermore, eight through holes 10d for screwing are bored at equal intervals in the axial direction on the edge of the fixing part 10e.

Reference numeral 11 denotes a mounting jig attached to the rod 3, and the tip surface, that is, the test piece mounting surface has a flat part 11 perpendicular to the vertical movement direction and the central axis of rotation of the rod 3, and the test piece 11 in the axial direction. A substantially spherical concave portion 11 having approximately the same curvature as the convex portion 10b of the piece.
b is provided, and the flat part 11aK is provided with a screw hole 11d corresponding to the through hole 10dK of the test piece in the axial direction.
There are separate locations.

Note that the convex portion 10b and the four portions 11b are configured so that they do not fit together completely, and an appropriate gap is formed between the flat portion 1()a and the flat portion 11m. Also, the through hole 10d is slightly larger in diameter than the fixing hole 12, and the fixing part 10e
It has a substantially spherical taper on the inner surface side.

Next, the operation for attaching the test piece 10 to the jig 11 will be explained.

First, as shown in FIG. 19, one of the fixed portions 10e of the test piece 10 is temporarily fixed to the jig 11 using fixing bolts 12. At this time, the test piece flat part 10 a
However, if the mounting is carried out while measuring so that it is parallel to the jig flat part 11a, the test piece 10 can be temporarily fixed with its axis substantially perpendicular to the jig flat part 11a. . Next, as shown in FIG. 21, while pressing the measuring rod 13 of the dial gauge 14 against the parallel portion 10c of one test piece, the mounting is performed by moving the jig 11 up and down, rotationally, or a combination of both directions. The test piece 1 ( ) is fixed while tightening the fixing bolt 12 so that the range of change in the indicated value of the dial gauge 14 becomes a negligible value within the processing accuracy during the manufacture of the parallel part 10 e of the test piece. Next, a plurality of strain gauges 1 are placed on the same circumference of the surface of the parallel portion 10e of the test piece in the axial direction and in a direction inclined to the axial direction.
5, and tighten the VC fixing bolts 12 carefully so that no strain occurs due to tension, compression, bending or threading, and attach the other fixing part 10e of the test piece 10 to the other mounting jig 11.
Fixed to. Therefore, the test piece 10 is mounted with its axis perpendicular to the mounting surface of the jig 11.

In addition, during the above-mentioned fixing, by fixing while checking the load signal from the test equipment load cell (not shown) directly connected to the jig 11, higher precision can be achieved.

In addition, in the above mounting operation, after completely fixing the test piece 10 and one MLL group 10e to the jig 11,
An example has been described in which the other fixed part 10e is fixed to the jig 11 for mounting the other, but when the fixed parts 10e at both ends of the test piece are simultaneously fixed to the jig 11 for each mounting, substantially the same method as above is used. It can be attached by operation.

In addition, by making the through hole 10'd of the test piece larger in diameter than the fixing hole 12, and providing a substantially spherical taper on the inner side of the fixing part 10e, it can sufficiently cope with the inclination of the test piece 10. can be securely bolted. Further, in the above embodiment, eight fixing poles 12 were used, but the number is not limited as long as the test piece 10 can be fixed to the jig 11 accurately and reliably.

Embodiment 2 In FIGS.
The other structure is the same as that of the first embodiment.

Even if the convex part or four parts are in the shape of a truncated polygonal pyramid such as a square pyramid, the fixing bolts may be tightened depending on the condition, and the test piece can be mounted with the axis of the test piece perpendicular to the mounting surface of the jig. Furthermore, in a test in which a load or displacement of the screw p is applied to the test piece, the position can be fixed more reliably.

Example 3 Figure 16 is a modification of the configuration example shown in Figure 16r.

That is, a substantially spherical sliding surface 18 protruding in the axial direction is formed on the mounting surface of the fixing portion 10e of the test piece 10.
A flat part 19 perpendicular to the parallel part 10c is provided on the inner surface of the fixed part 10e. For mounting, the mounting surface of the jig 11 is recessed with a substantially spherical sliding portion 9 having the same curvature as the sliding surface 18 of the test piece. Reference numeral 21 denotes a plurality of fixing members pivotally mounted at equal intervals around the circumference H of the jig 11, and set screws n are provided on the free end side. Note that B is a scale provided to facilitate adjustment when temporarily fixing.

With this configuration, similarly to the above embodiment, the sliding surface 18 and the pad are slid relative to each other while measuring, and the set screw n is tightened so as to press the flat part 18, so that the test piece lO is It can be attached to the jig 11 with the axes perpendicular to each other.

〔Effect of the invention〕

The test piece mounting structure of the present invention has an axis adjustment member interposed between the test machine mounting surface and the test piece mounting surface, or a sliding surface is formed between the test machine mounting surface and the test piece mounting surface. By doing this, the test piece is mounted on the test machine with the axis of the test piece perpendicular to the mounting surface of the test machine, and there is virtually no inclination of the test piece that would cause errors in test data. , it is possible to conduct tests with extremely high accuracy, and is useful for testing the strength and deformation characteristics of various materials.

[Brief explanation of drawings]

FIGS. 1 and 2 are fractured sectional views showing how the conventional test piece is mounted, FIG. 3 is a fractured sectional view showing the structure of the axis adjustment member according to the present invention, and FIG. 4 is a plan view of the same. Figure 5 shows unexploded 8A
6th fragmented cross-sectional view showing the configuration of another axis adjustment member according to K
The figure is a plan view of the same, FIG. 7 is a fragmented sectional view showing the configuration of another axial center adjusting member according to the present invention, FIG. 8 is a plan view of the same, and FIG. 9 is another axial center adjusting member according to the present invention. 10 is a plan view of the same, FIG. 11 is a broken sectional view showing the structure of another fine adjustment member according to the present invention, FIG. 12 is a plan view of the same, and FIG. 13 is a plan view of the same. FIG. 14 is a fragmented cross-sectional view showing the structure of another shaft center adjusting member according to the present invention, FIG. 15 is a fragmentary cross-sectional view showing the structure of another shaft center adjusting member according to the present invention. FIG. 16 is a fractured sectional view showing the configuration of the center adjustment member; FIG. 16 is a fractured sectional view showing the configuration of the sliding surface according to the present invention; FIG. 17 is a fractured sectional view of the test piece in Example IK;
The figure is a plan view of the same test piece. Figure 19 is a fractured cross-sectional view showing how the test piece is attached to the jig, Figure 4 is a plan view of the jig, and Figure 21 is a diagram showing how the test piece is attached to the jig. Explanatory drawings, Figure 22 is a fractured sectional view of the test piece in Example 2, Figure 2 is a plan view of the same test piece, Figure C is a fractured sectional view of the jig for the same installation, and Figure 5 is a fractured sectional view of the test piece for the same installation. The plan view and base diagram of the jig are fractured cross-sectional views showing how the test piece is attached to the jig in Example 3. A, B, C...Axis adjustment member, D, E...Sliding surface, 10...Cylindrical test piece, 10a...Flat part, 10
b...Convex part, 10C--Parallel part, 10d...
Through hole, 10 e... Fixed part, 11... Mounting jig, 11 a... Flat part, 11 b... Recessed part,
11 d...screw hole, 12...pol l-, 13...
・Measurement rond, 14...Dial gauge, 15...Strain gauge, 16...Protrusion, 17...
Recessed part, 18... sliding surface, 19... flat part,
Add...Sliding 9 mating surface, 2]...Fixing member,
n...set screw, Z3...scale. Figure 21

Claims (1)

[Claims] An axial center adjusting member is interposed between the mounting surface of the testing machine and the mounting surface of the test piece, or a sliding surface is formed between the mounting surface of the testing machine and the mounting surface of the test piece, and this axial center adjusting member or sliding A mounting structure for a test piece, characterized in that the test piece is mounted on a testing machine with the axis of the test piece perpendicular to the mounting surface of the testing machine.