JPH06265457A - Hot tension testing jig - Google Patents

Abstract

PURPOSE:To provide a small size hot tension testing jig that is ease of aligning work, short in test time and excellent in heat resistance. CONSTITUTION:A test piece 11, a pair of half globular collets 21, a cylindrical cap nut with a spherical inner wall 22a comining into contact with a spherical outer wall 21a of each collet 21, and a columnar shaft member 23 engaging with this cap nut 22 are all parallelly installed on the same axis. Those of globular collet 21, cap nut 22 and shaft member 23 is made up of a molybdenum alloy being high in heat resistance. Since the outer wall 21a of the globular collet 21 and the inner wall 22a of the cap nut 22 both are formed in a spherical shape each and being mirror finished, they are sliding on each other. In the case where both axes of the test piece 11 and the shaft member 23 are not accorded with each other, slight tensile force is added to an interval between them, whereby the outer wall 21a of the globular collet 21 and the inner wall 22a of the cap nut 22 are slidden with each other, so that their axes are easily congruent with each other. As a test jig is made up of a small number of part items, it is miniaturized and, what is more, a span of test time becomes shortened because of aligning work being easy enough.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature tensile test jig for evaluating the characteristics of a test piece by applying a tensile force to the test piece at high temperature.

[0002]

2. Description of the Related Art Conventionally, in a high temperature tensile test jig for materials such as ceramics, Japanese Industrial Standard JIS R160
As shown in Fig. 6, as a means for reducing the bending stress due to the misalignment of the shaft center, a method of using a soft metal foil or powder layer as an interference material, a method of using a ball bearing, a base bearing, etc. A method using a heart shape holding device is known. It is also known to apply molybdenum paste to the surface of each jig or to provide a water cooling device in order to prevent damage to the jig due to high temperature.

[0003]

However, in the above-mentioned conventional high temperature tensile test jig, the one using the flexible metal foil or the powder layer as the interfering material is not sufficient in the centering effect, and the other one. Has a large number of parts for centering, the jig setting and centering work is complicated and requires a long time, and since the size of the jig is too large, the jig cannot be introduced into the heating furnace. There is a problem that the shape of the test piece and the size of the heating furnace are restricted. Further, when the molybdenum paste is applied to prevent damage to the jig due to high temperature, gas may be generated from the molybdenum paste in a high temperature environment, and there is a problem of contaminating the atmosphere in the heating furnace. Further, there is a problem that cleaning the molybdenum paste applied to the jig is complicated and takes time. Further, the one equipped with the water cooling device has a problem that there is a risk of steam explosion due to water leakage and the device becomes large.

The present invention has been made in order to solve such a problem, and provides a small-sized high temperature tensile test jig having a small number of parts, an easy aligning work, a short test time, and good heat resistance. The purpose is to provide.

[0005]

A high temperature tensile test jig according to the present invention for solving the above-mentioned problems comprises a pair of half-divided members each having a recess capable of engaging with a shoulder portion of a test piece and a hemispherical outer wall. By joining the side end surfaces of the pair of half-divided members to each other, the outer wall is provided with a half-divided member made of a heat-resistant material having a spherical shape, and provided on the same axis as the axis of the half-divided member, A cylindrical body made of a heat-resistant material having a spherical inner wall slidable on the outer wall of the half-split member and a joint, and provided on the same axis as the axis of the half-split member, and capable of coupling with the joint of the cylinder And a shaft member made of a heat-resistant material having various connecting portions.

[0006]

In the high temperature tensile test jig of the present invention, the spherical outer wall of the pair of half members for locking the test piece and the spherical inner wall of the cylinder slide with each other. Easy to use and has excellent heat resistance. Further, since no paste is used, the test can be performed in a high vacuum and a clean atmosphere.

[0007]

EXAMPLE An example of the present invention will be described with reference to FIGS. The high temperature tensile test jig 10 according to the embodiment of the present invention includes a locking portion 11 of a test piece 11 processed as shown in FIGS.
A pair of half spherical collets 21 that abut on the locking surface 11b and the side surface 11c of a, and the spherical outer wall 21 of the spherical collet 21.
It is composed of a cylindrical fukuro nut 22 having a spherical inner wall 22a that abuts a, and a shaft member 23 having a screw portion 23a that is coupled to the screw portion 22b of the fukuro nut 22. Here, the spherical collet 21, the swoon nut 22, and the shaft member 2
3 is made of a molybdenum alloy having high heat resistance and is arranged in parallel on the same axis. It is also possible to use a material having high heat resistance other than the molybdenum alloy.

The spherical collet 21, as shown in FIG.
The hemisphere has a shape obtained by dividing the hemisphere in half, and the side end surfaces 21b are brought into contact with each other to form a hemisphere. Spherical collet 21
The outer wall 21a has an extension portion 21b whose cross-sectional contour shape extends beyond a quarter circle as shown in FIG. 1, and is mirror-polished. Therefore, the spherical collet 21
The outer wall 21a and the inner wall 22a of the cap nut 22 do not get caught when sliding and slide smoothly with each other.

The screw nut 22 has a circular hole 22c having a diameter larger than the diameter of the locking portion 11a of the test piece 11, the inner wall 22a is mirror-polished, and is smoothly slid with the outer wall 21a of the spherical collet 21. It is possible. The shaft member 23 is
A screw part 23a is provided on the outer circumference of the end part that fits with the cap nut 22.
As shown in FIG. 1, the test piece 11 has a threaded portion 22 of the cap nut 22 so that the test piece 11 maintains a desired distance from the shaft member 23.
Combine with b.

Next, the test procedure will be described. As shown in FIG. 3, one locking portion 11a of the test piece 11 is passed through the circular hole 22c of the swivel nut 22, and the side end surfaces 21b of the pair of spherical collets 21 are brought into contact with each other so that one side of the test piece 11 is engaged. The stopper 11a is included. Next, the convex portion 11d of the locking portion 11a is fitted into the concave portion 23b of the shaft member 23, the spherical collet 21 is covered with the fukuro nut 22, and the screw portion 23a of the shaft member 23 is rotated. At this time, as shown in FIG. 1, the engaging portion 11a and the end portion of the shaft member 23 that is connected to the cap nut 22 are spaced apart from each other by a desired distance, and the outer wall 21 of the spherical collet 21 is opened.
When a and the inner wall 22a of the nut nut 22 slide for alignment, the locking portion 11a of the test piece 11 is prevented from coming into contact with the end portion of the shaft member 23 having the screw portion 23a. The same applies to the other locking portion 11a of the test piece 11.

Next, the end portion 23c of the shaft member 23 on the side where the screw portion 23a does not exist is connected to a pulling device (not shown).
When the axis lines of the test piece 11 and the shaft member 23 do not match, the spherical collet 2 is applied by applying a slight tensile force.
The outer wall 21a of No. 1 and the inner wall 22a of the nut nut 22 slide so that their axes easily coincide with each other. When the axes coincide with each other, the test piece 11 is inserted into a heating furnace (not shown) together with the high temperature tensile test jig 10 to raise the temperature to a desired temperature, and a tensile force is applied.

In the embodiment of the present invention, the screw nut 22 and the shaft member 23 are connected by the screw portion 22b of the screw nut 22 and the screw portion 23a of the shaft member 23. For example, a pin that penetrates the screw nut 22 and the shaft member 23. It is possible to connect the nut nut 22 and the shaft member 23 with a strip-shaped member. In the present invention, it is possible to use a water cooling device in order to prevent damage due to heat of a pulling device (not shown) which applies a pulling force.

[0013]

EFFECTS OF THE INVENTION According to the high temperature tensile test jig of the present invention, there is an effect that the jig can be easily aligned with a small jig having high heat resistance and a high temperature high temperature tensile test can be performed with high accuracy.

[Brief description of drawings]

FIG. 1 is an enlarged view of a portion I of FIG.

FIG. 2 is a partial one-sided vertical sectional view showing a high temperature tensile test jig according to an example of the present invention.

FIG. 3 is a schematic diffusion exploded view showing a high temperature tensile test jig according to an example of the present invention.

[Explanation of symbols]

 10 High Temperature Tensile Test Jig 11 Test Specimen 21 Spherical Collet (Half Divided Member) 21b Side End 22 Fuch Nut (Cylinder) 22b Threaded Part (Coupling Part) 23 Shaft Member 23a Screw Part (Coupling Part)

Claims (1)

[Claims] 1. A pair of half-divided members having a recess and a hemispherical outer wall engageable with a shoulder portion of a test piece, the outer wall being formed by joining side end surfaces of the pair of half-divided members. Is a spherical member made of a heat-resistant material, and a heat-resistant material that is provided on the same axis as the axis of the half-member and has a spherical inner wall slidable on the outer wall of the half-member and a joint portion. And a shaft member made of a heat-resistant material that is provided on the same axis as the axis of the half member and that has a coupling part that can be coupled to the coupling part of the tubular member. Tensile test jig.