JPS6222829Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rupture test piece holder that is capable of holding a rupture test piece while maintaining a symmetrical positional relationship.

Traditionally, after a test piece is fractured using a material testing device, etc., the fracture surface is observed using an electron microscope, etc., but when comparing and observing corresponding points on both fracture surfaces, it is necessary to It is very difficult to determine the points.

For test specimens with a rectangular cross section, there is a plane or corner that serves as a reference, so it is relatively easy to determine the corresponding points on the left and right fracture surfaces, but when there is no reference such as with a round bar specimen, It becomes difficult to determine corresponding points.

Conventionally, the above-mentioned corresponding points have been determined by visual measurement, but if one of the fractured surfaces is a convex surface, the corresponding portion has a complicated shape, such as a concave or convex surface, making it extremely difficult to determine.

Alternatively, a reference line may be drawn on the outside of the test piece by overlapping the fractured surfaces, and corresponding points may be determined by referring to the line. However, there is a problem in that the fractured surfaces are often damaged during overlapping, making it impossible to observe the fractured surfaces correctly.

The present invention attempts to solve these problems, and aims to provide a fracture test specimen holder that maintains a symmetrical positional relationship of fracture surfaces and allows easy determination of corresponding points. .

For this reason, the fracture test piece holder of the present invention is a holder that can engage each of the fracture pieces in order to restrain both fracture pieces after the test piece is broken, which is installed between a pair of chucks in a tensile testing machine. Block and
It is characterized in that it includes a connecting block that rotatably connects these holding blocks with a pair of mutually parallel pins.

Hereinafter, a fracture test specimen holder as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is an elevational view showing its usage state, and Fig. 2 is a -
FIG. 3 is a cross-sectional view taken along the - arrow in FIG. 1, and FIG. 4 is an elevational view showing another state of use.

As shown in FIG. 1, holding blocks 4a and 4b are provided so as to be able to engage with fragments 1a and 1b broken between the chucks 3a and 3b of the tensile tester 2.

Each holding block 4a, 4b has a hole 7a for holding the broken pieces 1a, 1b through.
7b is provided. These holes 7a, 7b
The lower part is V-shaped in order to hold the round rod-shaped fragments 1a and 1b.

In addition, in order to fix the broken pieces 1a and 1b to the holding blocks 4a and 4b, respectively, setscrews 5a and 5 are used.
b is provided.

Furthermore, marks 8a and 8b for alignment are provided on opposing surfaces of the holding blocks 4a and 4b.
They are placed in corresponding positions.

These holding blocks 4a, 4b have a symmetrical shape, and their lower portions are columnar with a rectangular cross section.

Then, with this columnar part, the holding block 4
A connecting block 6 is provided so as to be connected to a and 4b.

As shown in FIGS. 2 and 3, the cross section of the connecting block 6 is configured so as to be in surface contact with the lower portions of the holding blocks 4a, 4b. However, since a slight gap is left, the holding blocks 4a and 4b can be attached to and detached from the coupling block 6.

In addition, the coupling block 6 has a cylindrical penetrating portion 6.
a and 6b are provided at symmetrical positions with the center guide 12 as the center, and the holding blocks 4a and 4b
There is also a cylindrical penetration part 10 at the bottom of the
a and 10b are provided, respectively. Note that the reference numeral 10a is not shown.

These through-holes 6a, 6b, 10a, 10b
The connecting pins 11a and 11b, the outer diameter of which is slightly smaller than the inner diameter of the through-hole, are inserted into the through-holes.
1. Thus, movement relative to the connecting block 6 is restricted to the rotational directions shown by the arrows A and A' in FIG.

Moreover, due to the shape of the lower parts of the holding blocks 4a and 4b, movement in the directions of arrows A and A' is also possible from upright to outward.
Limited to a range of up to 90°.

With the above-described structure, when holding a fracture test piece, the chucks 3a and 3b are moved in advance to open a gap between the broken pieces 1a and 1b, and the holding blocks 4a and 4b are removed from the coupling block 6. Then, the set screws 5a, 5b are loosened, and the holding blocks 4a, 4b are attached to the broken pieces 1a, 1b with the marks 8a, 8b facing each other, but they are not fixed at first.

Next, the coupling block 6 connects the holding blocks 4a,
4b, and after adjusting the positional relationship, the coupling pins 11a and 11b are inserted. As a result, the holding block 4a and the holding block 4b are
maintained in a perfectly symmetrical position.

Then, the broken pieces 1a, 1b are fixed to the holding blocks 4a, 4b with the set screws 5a, 5b while keeping the holding blocks 4a, 4b in an upright state. After that, pull out the connecting block 6 and remove the broken piece 1.
a, 1b can be removed from the chucks 3a, 3b while being fixed with the holding blocks 4a, 4b.

Even if the fractured pieces 1a and 1b are removed in this way, the corresponding points on the fractured surfaces are still attached to the holding blocks 4a and 4.
Since it is fixed based on b, it will not shift.

When observing the fracture surface, hold the holding blocks 4a, 4
b is attached to the connecting block 6, and the holding blocks 4a and 4b are rotated to the position shown in FIG. 4 for observation. At this time, the two fracture surfaces are located at symmetrical positions with the center guide 12 as the center, so by moving the coupling block 6 by the same distance from the center using a sample device (not shown), it is possible to accurately determine the fracture surfaces. Corresponding points can be quickly observed.

In this way, since the broken pieces 1a and 1b are fixed when removed from the tensile tester 2, the corresponding points do not shift. Moreover, since the fractured surfaces do not come into contact with each other during or after removal, there is no risk of damaging, crushing, or deforming the fractured surfaces.

As described in detail above, according to the fracture test piece holder of the present invention, in order to restrain both fracture pieces of the test piece attached between a pair of chucks in a tensile tester after the fracture occurs, each of the fracture pieces is The simple structure consists of a holding block that can be engaged with the fracture surface, and a connecting block that rotatably connects these holding blocks with a pair of mutually parallel pins, making it easy to determine the corresponding points on the fracture surface. This has the advantage that damage to the fractured surface can be sufficiently prevented.

[Brief explanation of the drawing]

Figures 1 to 4 show a fracture test piece holder as an embodiment of the present invention. Figure 1 is an elevational view showing its use, and Figure 2 is a sectional view taken along the - arrow in Figure 1. , FIG. 3 is a sectional view taken along the - arrow in FIG. 1,
FIG. 4 is an elevational view showing another state of use. 1a, 1b...Fragment piece, 2...Tensile tester, 3
a, 3b...chuck, 4a, 4b...holding block, 5a, 5b...set screw, 6...coupling block, 6a, 6b...penetrating part, 7a, 7b...hole, 8a, 8b... Mark, 10b...penetrating part,
11a, 11b...Connection pin, 12...Center guide.

Claims (1)

[Scope of utility model registration request] In order to restrain the fractured pieces of a test piece installed between a pair of chucks in a tensile testing machine, a holding block that can engage with each of the broken pieces, and a pair of parallel holding blocks that are connected to each other are used. 1. A fracture test piece holder comprising a connecting block rotatably connected by a pin.