JP3279213B2 - Metal material flexibility evaluation method and evaluation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for evaluating the flexibility of a metal material.

[0002]

2. Description of the Related Art Generally, metal materials are evaluated for their softness, strength, flexibility and the like.

[0003] First, the softness of a metal material is evaluated by measuring the hardness of the metal material and measuring the hardness. As a method for testing the hardness of such a metal material, there are a Vickers hardness tester, a Rockwell hardness tester, a Knoop hardness tester, and the like. These can be appropriately selected and determined according to the material and hardness of the metal material to be measured.

[0004] The strength of a metal material can be determined by measuring the tensile strength. The flexibility of the metal material is evaluated by fixing both ends of the test metal material, the amount of bending at the center, the maximum load that can be applied to the center, and the like.

[0005]

Conventional devices for measuring the hardness and strength of metallic materials are large and expensive, and the maintenance of these devices is very expensive. Since these measurements are material destruction measurements, it is necessary to prepare a sample in a specific shape, and furthermore, the operation of the measuring device also requires specialized knowledge. Therefore, there is a problem that the measurement cost is high.

There is no simple evaluation method for evaluating the flexibility of a metal material. It is ambiguous to simply evaluate the presence or absence of flexibility, and is of little industrial value.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and an apparatus for evaluating the flexibility of a metal material which eliminates the above-mentioned disadvantages of the prior art, is inexpensive, simple and has a high industrial value.

[0008]

According to the present invention, in order to achieve the above object, one end of a test piece is fixed and dropped in a free circular motion, and the test piece collides with a test piece collision jig at a point where a maximum acceleration is reached. Provided is a method for evaluating flexibility of a metal material, wherein the flexibility is evaluated by reading a deformation amount of a test piece at that time on a scale.

In order to achieve the above object, the present invention provides a test piece mounting jig for fixing one end of a test piece, a test piece fixing jig for horizontally fixing a test piece, and a test piece mounting jig. A test piece collision jig provided at a point where the maximum acceleration is obtained when the test piece is dropped in a free circular motion around the jig, and a deformation amount of the test piece generated when the test piece collides with the test piece collision jig The present invention provides a test strip flexibility evaluation device characterized by comprising a scale for reading a test piece.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and an apparatus for evaluating flexibility of a metal material according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a drawing showing an evaluation device,
(A) is a front view, (b) is a side view.

The evaluation device main body 1 includes a main body tilt adjusting screw 2,
It comprises a test piece mounting jig 4, a test piece fixing jig 5, a test piece collision jig 7, and a scale 8.

The test piece 3 has a columnar or rectangular parallelepiped shape, and its length is slightly larger than the distance between the test piece mounting jig 4 and the test piece collision jig 7.

First, the main body 1 is placed on a horizontal table,
The main body 1 is set horizontally with four main body inclination adjusting screws 2 while using a level or the like. The test piece 3 is inserted and mounted in the test piece mounting jig 4. The test piece 3 can rotate around the test piece mounting jig 4.

Next, one end of the test piece 3 is fixed to a test piece fixing jig 5 and the test piece is fixed horizontally. After such a horizontal fixation, the test piece fixing jig 5 is released and the test piece 3 is fixed.
Starts a free-falling circular motion around the test piece mounting jig 4.

One end of the test piece 3 collides with the test piece collision jig 7 at the point where the maximum acceleration is obtained during the circular movement. At this time, the test piece 3 is deformed in the tangential direction of the test piece collision jig 7 on the circular orbit. The amount of this deformation, that is, when the test piece 3 collides with the collision jig 7 and deflects to the right in the drawing, the flexure of the test piece at that time is read by the scale 8 to make it flexible.

The scales 8 are drawn at intervals of 1 mm for easy reading. If necessary, a lighting device or the like for the scale 8 may be provided.

The following table shows the measurement results of the present embodiment. The test piece 3 is a copper tube (equivalent to JIS, C1220T) and has an outer diameter of 9.5 mm, a wall thickness of 0.36 mm, and a length of 1000 m (the interval between the test piece mounting jig 4 and the test piece collision jig 7). In the test, four types of test pieces having different tensile strengths were prepared, and the amount of deformation was measured five times.

[0019]

[Table 1]

The amount of deformation is reproducible and has little variation. As described above, the flexibility of the test piece could be easily and inexpensively evaluated by measuring the amount of deformation. One end is fixed and free circular motion is dropped, and the object is made to collide with the collision jig at a quarter point of the circular motion. From this momentum, for example, it is possible to convert the applied load to the center of the test piece by fixing both ends. it can. Therefore, this amount of deflection can be used immediately in other industries.

[0021]

According to the present invention, it is possible to provide a method and an apparatus for evaluating the flexibility of a metal material which are inexpensive, simple and have high industrial value.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an embodiment of a metal material flexibility evaluation method and an evaluation apparatus according to the present invention, wherein (a) is a front view of the evaluation apparatus and (b) is a side view.

[Explanation of symbols]

 1 Body 2 Body tilt adjustment screw 3 Test piece 4 Test piece mounting jig 5 Test piece fixing screw 7 Test piece collision jig 8 Scale

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 33/00-33/46 G01N 3/00-3/62

Claims (2)

(57) [Claims] 1. A test piece is fixed to one end and dropped in a free circular motion. The test piece is caused to collide with a test piece collision jig at a point where a maximum acceleration is reached, and the deformation amount of the test piece at that time is read on a scale to be flexible. A metal material flexibility evaluation method characterized by evaluating the flexibility. 2. A test piece mounting jig for fixing one end of a test piece, a test piece fixing jig for horizontally fixing the test piece,
A test piece collision jig provided at a point where the maximum acceleration is obtained when the test piece is dropped in a free circular motion around the test piece mounting jig, and the test piece collides with the test piece collision jig. A test piece flexibility evaluation device comprising a scale for reading an amount of deformation of the test piece generated at the time.