JPS5933849B2 - Atmosphere material testing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a testing device for evaluating material strength under various environments, for example, an atmospheric material testing device for placing a test piece in an atmospheric chamber such as a vacuum chamber and testing the material. It is.

When placing a specimen in a vacuum chamber and testing the material,
A test device in which a pair of chucking rods protrude into a vacuum chamber is commonly used.

By gripping both lengthwise ends of the test piece with a pair of chucking rods and relatively displacing the pair of chucking rods, a test load such as a tensile load can be applied to the test piece. However, when gripping both lengthwise ends of the test piece, the test piece must be manipulated from outside the vacuum chamber. Conventionally, the test specimen was manipulated from the outside and gripped at both longitudinal ends with chucking rods.
It wasn't easy. After the test, both lengthwise ends of the test piece were removed from the chucking rod in the same manner. The present invention has been made to enable an atmospheric material testing machine of this type to easily grasp both lengthwise ends of a test piece with a chucking rod and easily remove it from the chucking rod. be.

In particular, this invention divides the peripheral wall of an atmosphere chamber such as a vacuum chamber into at least two parts in the length direction of a test piece,
The divided peripheral wall is fitted in at least a double cylindrical shape and expandable and contractable in the length direction of the test piece, and the peripheral wall of the atmosphere chamber is configured to be removed from the area between the pair of chucking rods. That is. below,
Embodiments of the invention will be described with reference to the drawings. In FIG. 1, a test piece 1 is placed in a vacuum chamber 2. In FIG.

Both longitudinal ends of the test piece 1 are held by a pair of upper and lower chucking rods 3H and 3L. The upper chucking rod 3H protrudes from above into the vacuum chamber 2, and the lower chucking rod 3L protrudes into the vacuum chamber 2 from below. The amount of protrusion of the chucking rod 3H is small, and the amount of protrusion of the chucking rod 3L is large. The vacuum chamber 2 has a pair of upper and lower end walls 4H and 4L, and peripheral walls 5H and 5L that are divided into two in the vertical direction, that is, in the length direction of the test piece 1.

The pair of upper and lower end walls 4H and 4L are the chucking rods 3H.
, 3L. Divided peripheral wall 5H,
5L is double cylindrical and in the vertical direction, that is, test piece 1
are fitted so that they can expand and contract in the length direction. Upper peripheral wall 5
H is fitted into the upper end wall 4H so as to be relatively displaceable in the vertical direction and separable, and connected to the slider 6. The lower peripheral wall 5L is fixed to the lower end wall 4L. Seal rings 7 are used to seal between the end wall 4H and the peripheral wall 5H, between the peripheral walls 5H and 5L, and between the peripheral wall 5L and the end wall 4L. The inside of the vacuum chamber 2 is evacuated by a vacuum pump P.

The test piece 1 is heated by a heating furnace 8 and kept at a high temperature. The heating furnace 8 includes an elliptical reflecting mirror 9 surrounding the upper peripheral wall 5H of the vacuum chamber 2 as shown in the second part,
It consists of a pair of infrared lamps 10 arranged at the focal point. The reflecting mirror 9 is divided into two parts in the radial direction. The upper peripheral wall 5H of the vacuum chamber 2 is made of a heat-resistant transparent material, and the infrared rays of the infrared lamp 10 are reflected by the reflecting mirror 9 and then pass through the peripheral wall 5H. Is test piece 1 affected by radiant heat? and heated. Therefore, the time required to raise and lower the temperature of the test piece 1 is short. Chucking rod 3H,
3L is cooled by cooling water circulating through its internal flow path 11. In this embodiment, a detector 12 such as a differential transformer for detecting deformation such as elongation of the test piece 1 is arranged between the lower chucking rod 3L and the lower peripheral wall 5L. The detector 12 is suspended from a pair of gauge points on the test piece 1 by an arm 13 . As mentioned above, the amount of protrusion of the lower chucking rod 3L into the vacuum chamber 2 is large. Therefore, the detector 12 can be placed in the vacuum chamber 2 away from the test piece 1 and can be protected from heat and prevented from being damaged. In the atmospheric material testing apparatus configured as described above, after evacuating the vacuum chamber 2 and heating the test piece 1, the pair of chucking rods 3H and 3L are relatively displaced in the vertical direction. , a test load such as a tensile load can be applied to the test piece 1. Therefore, the test piece 1 can be subjected to a vacuum high temperature material test. The upper peripheral wall 5H of the vacuum chamber 2 is relatively displaced in the direction of the soil with respect to the upper end wall 4H or the lower peripheral wall 5L, and the chucking rod 3H,
Absorbs 3L displacement. When holding both lengthwise ends of the test piece 1 with the chucking rods 3H and 3L, since the reflector 9 of the heating furnace 8 is divided into two in the radial direction,
It can be easily displaced and separated in the radial direction.

Therefore, the heating furnace 8 can be removed from around the vacuum chamber 2 to expose the vacuum chamber 2. Thereafter, when the slider 6 is slid downward, the upper peripheral wall 5H of the vacuum chamber 2 is displaced downward together with the slider 6. The upper peripheral wall 5H is separated from the upper end wall 4H and overlapped with the outer periphery of the lower peripheral wall 5L. Therefore, the entire peripheral walls 5H and 5L are reduced in the length direction of the test piece 1. As a result, the upper peripheral wall 5H is removed from the region between the pair of chucking rods 3H and 3L, and the region between the chucking rods 3H and 3L is opened to the outside. The amount of protrusion of the upper chucking rod 3H into the vacuum chamber 2 is small, and the amount of protrusion of the lower chucking rod 3L is large, so when the upper peripheral wall 5H is displaced downward, the chucking rod 3H , 3L is completely opened. Therefore, the test piece 1 can be easily inserted between the chucking rods 3H and 3L, and both lengthwise ends can be easily gripped by the chucking rods 3H and 3L. The detector 12 and the arm 13
Therefore, it can be easily suspended from the gage of the test piece 1, and can be easily placed between the lower chucking rod 3L and the lower peripheral wall 5L. Thereafter, when the slider 6 is displaced upward, the upper peripheral wall 5H is displaced upward,
The entire peripheral walls 5H and 5L extend in the length direction of the test piece 1.

The upper peripheral wall 5H is fitted into the upper end wall 4H and sealed by the seal ring 7. After that, vacuum chamber 2
is surrounded by the reflecting mirror 9 of the heating furnace 8, and the vacuum chamber 2
As described above, if the test piece 1 is evacuated and the test piece 1 is heated, the test piece 1 can be subjected to a vacuum high-temperature material test. After the test, both lengthwise ends of the test piece 1 can be removed from the chucking rods 3H and 3L in the same manner and can be easily removed.

It should be noted that various modifications of the present invention are possible in addition to the above-mentioned embodiments.

In the above embodiment, a case has been described in which the peripheral wall of the vacuum chamber 2 is divided into two in the length direction of the test piece 1, but it may be divided into three or more parts depending on the case. Divided surrounding wall into 3
It is also possible to fit more than one cylinder. FIG. 3 shows a structure in which the peripheral wall is divided into four parts and fitted together in a triple cylinder shape. That is, the upper peripheral wall 5H1, the intermediate peripheral wall 5M, and the lower peripheral wall 5L are fitted into a triple cylinder shape, and the upper peripheral wall 5H is further fitted into the upper peripheral wall 5H'. Peripheral wall 5
H' is fixed in place and connected to end wall 4H by bellows 14. The bellows 14 seals between the peripheral wall 5H' and the end wall 4H, expands and contracts in the vertical direction, and absorbs displacement of the end wall 4H. Chucking rod 3H, 3
When opening the space between L to the outside, when the peripheral wall 5H is displaced downward, the stopper 15 contacts the peripheral wall 5M, and the peripheral wall 5M
can be displaced downward against the elasticity of the spring 16. Therefore, the entire peripheral walls 5H, 5M, and 5L can be effectively expanded and contracted. The present invention can also be applied to test equipment in which the test piece is placed in another atmospheric chamber, such as a high-pressure chamber, rather than a vacuum chamber.

As explained above, the present invention divides the peripheral wall of the atmosphere chamber into at least two parts in the length direction of the test piece, and the divided peripheral wall has at least a double cylindrical shape and can be expanded and contracted in the length direction of the test piece. 2, the peripheral wall of the atmosphere chamber can be easily removed from the area between the pair of chucking rods.

Therefore, both lengthwise ends of the test piece can be easily gripped by a pair of chucking rods, and can be easily removed from the chucking rods.
The extensometer can also be easily operated.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the invention, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a longitudinal cross-sectional view showing a modification of FIG. 1. 1... Test piece, 2... Vacuum chamber (
atmosphere chamber), 3H, 3L...chucking rod, 5H, 5H', 5M, 5L...peripheral wall.

Claims (1)

[Claims] 1. Grip both lengthwise ends of a test piece placed in an atmosphere chamber with a pair of chucking rods, and relatively displace the pair of chucking rods, thereby applying a test load to the test piece. In a device made like this,
The peripheral wall of the atmosphere chamber is divided into at least two parts in the length direction of the test piece, and the divided peripheral wall is fitted in at least a double cylinder shape so as to be expandable and contractible in the length direction of the test piece. An atmospheric material testing device characterized by being configured such that it can be removed from an area between a pair of chucking rods.