JPH10142126A - Chuck nib for pull test coated with viscous body containing hard particle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a pull test accurately by applying a mixed viscous body where a hard particle is mixed into a viscous body to the contact surface with the test body of a chuck nib body and performing chucking. SOLUTION: A hard particle 1 is made of, for example, diamond powder and a viscous body 2 is made of, for example, fats and oils. The hard particle 1 is mixed into the viscous body 2 to constitute a mixed viscous body 3. A spherical surface 7 of a chuck holder 6 is brought into contact with a spherical seat 9 that is adapted to the spherical surface of a chuck main body 8, a body 4 of a chuck nib is inserted into an inclination hole 10 of a chuck holder 6, and a test body T is inserted between opposite surfaces of the mixed viscous body 3 of the body 4 of the chuck nib. As a pull load increases, a surface pressure is generated between the body 4 of the chuck nib and the test body T owing to the operation of a wedge chuck and the hard particle 1 is engaged to the body 4 of the chuck nibs and the test body T to become a number of hook points, thus chucking the test body T between the bodies 4 of the chuck nibs positively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck for a tensile test to which a viscous material containing hard particles is applied.

[0002]

2. Description of the Related Art As shown in FIG. 7, a file 3 is formed on a chuck surface 32 of a chuck jaw 31 made of steel (or cemented carbide).
Some are marked with 3. Further, as shown in FIG. 8, there is a type in which hard particles 41 are plated (or baked with a baking agent) on a chuck surface 43 of a chuck claw 42 with a plating material 44.

[0003]

With a file-type chuck jaw, a test piece 3 made of fine ceramic, cemented carbide or the like is required.
4 is insufficient in hardness to make the test impossible, or the file 33 is worn out after several uses. In addition, the tip of the file 33 scratches the test piece, and the test piece 34 breaks from this portion, so-called chuck breakage, so that an accurate tensile breaking load cannot be measured.

[0004] The plating (sintering) type chuck claws are required to be used several times, so that the hard particles 41 or the plating material 44 (sintering agent) are damaged and peeled off, and must be plated (or sintered) again. This operation is very cumbersome and expensive.

[0005] In addition, this type of chuck claw is provided with each particle 4.
Advanced processing technology is required to bring the surface of the test piece 45 into close contact with the surface of the test piece 45. If the surface of the test piece 45 is not completely brought into contact, so-called chuck cutting occurs. An object of the present invention is to provide a chuck claw that can solve these problems.

[0006]

Means for Solving the Problems The first chuck jaws for a tensile test to which a viscous substance containing hard particles according to the present invention has been applied include diamond powder, alundum powder, carborundum powder, and superhard metal powder. Is mixed with a viscous substance such as an oil or fat or a non-cured adhesive to apply a mixed viscous substance to a contact surface of the main body with a test body.

[0007] The second chuck claw for a tensile test to which the viscous material containing hard particles according to the present invention is applied is made of a material which is softer than the material of the test piece, and is composed of diamond powder, alundum powder, carborundum. A mixed viscous material obtained by mixing hard particles such as powder and ultra-hard metal powder into a viscous material such as oils and fats or an uncured adhesive is applied to a contact surface of a main body with a test body. Due to the surface pressure, a large part of the surface is cut into the main body, and the remaining part is cut into the test body, forming an average number of hook points on the entire contact surface.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION For both round and flat materials, the contact surface between the chuck jaws and the test piece is designed to have a required area. Then, a mixed viscous body is prepared as follows in common with the first and second chuck claws of the present invention.

As the hard particles, diamond powder, alundum powder, carborundum powder, super hard metal powder and the like are selected. In addition, fats and oils, uncured adhesives, and the like are selected as the viscous body. Hard particles are mixed into the viscous body.
This mixed viscous material is applied to the contact surface of the main body of the chuck claw with the test body to perform chucking.

In the case of the first chuck jaw, as the tensile load increases, a surface pressure is generated by the action of the wedge-shaped chuck, and the hard particles are innumerably hooked points to reliably chuck the test specimen.

The mixed viscous material is applied each time a tensile test is performed or every several tests. In the case of fine ceramics, ceramics, glass, quenched thin steel plates, etc., ordinary steel chuck claws are difficult to catch and a tensile test is difficult or impossible.

However, when this viscous material is applied to the contact surface between the test sample and the chuck jaw main body, the hard particles engage with both the test sample and the chuck jaw main body due to the surface pressure of the contact surface accompanying the increase in the tensile load. Since innumerable hook points are formed, a smooth and reliable tensile test can be performed.

In the case of the second chuck jaw, the material of the chuck jaw body is made softer than the material of the test sample. Then, the mixed viscous material is applied to the contact surface of the main body of the chuck claw with the test body to perform chucking. Due to the surface pressure of the contact surface due to the increase in tensile load, most of the hard particles bite into the chuck jaw body, and the remaining part bites into the test piece, forming an average number of hook points on the entire contact surface I do. Therefore, a smooth and reliable tensile test can be performed.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate embodiments of the present invention, in which the same reference numerals indicate the same or corresponding parts.

FIG. 1 is a cut-away side view of a state in which a round specimen is chucked using the chuck claws of the present invention, and FIG.
FIG. 2 is a sectional view taken along line 2-2 of FIG. FIGS. 3 and 4 are similar to FIGS. 1 and 2 when the test piece is a flat material.

In these figures, reference numeral 1 denotes hard particles, such as diamond powder, alundum powder, carborundum powder, and superhard metal powder. Reference numeral 2 denotes a viscous material such as oil or fat, a non-cured adhesive, or the like. The hard particles 1 are mixed into a viscous body 2 to form a mixed viscous body 3.

Reference numerals 4 and 4 'denote chuck claws, and the mixed viscous material 3 is applied to contact surfaces 5 and 5' with the test pieces T and T 'to complete the chuck claws of the present invention.

The spherical surfaces 7 of the chuck holders 6 and 6 'are brought into contact with a spherical seat 9 of the chuck body 8 which matches the spherical surface 7, and the inclined holes 10 and 1 of the chuck holders 6 and 6'.
Insert the main body 4, 4 'of the chuck pawl into the test piece T,
T ′ is inserted between the opposing surfaces of the mixed viscous body 3 of the main body 4, 4 ′ of the chuck pawl and chucked.

FIG. 5 shows hard particles 1 when a tensile test was performed.
FIG. 4 is an explanatory view conceptually showing a state of a test piece T with respect to a contact surface 5 of a main body 4 of a test piece T and a chuck claw. In this case, as the tensile load increases, the body 4
A surface pressure is generated between the main body 4 and the test body T, and the hard particles 1 are engaged with the main body 4 and the test body T to form an infinite number of hooking points. Chuck.

FIG. 6 shows the test piece T 'and the main body 4 of the chuck jaw when the tensile test is performed when the material of the main body 4' of the chuck jaw is softer than the material of the test body T '. FIG. 7 is an explanatory view conceptually showing a state taken with respect to a contact surface 5 ′ of FIG. In this case, most of the hard particles 1 bite into the main body 4 'due to the surface pressure, and the remaining part bites into the test piece T', thereby forming an infinite number of hook points averaged over the entire contact surface 5 '. Form. Therefore, hard fine ceramics,
A tensile test can be accurately performed even on ceramics, glass, quenched thin steel sheets, and the like.

As described above, in any case, the mixed viscous material 3 is applied each time a tensile test is performed or every several tests.

[0022]

According to the present invention, a viscous mixture of inexpensive hard particles mixed with a viscous body is applied to the contact surface of the main body of the chuck claw with the test body and chucked. In the case of ceramics, glass, quenched thin steel sheets, etc., the hard particles can engage with the contact surface between the main body and the test specimen due to the surface pressure to form countless hook points,
Therefore, an accurate tensile test can be performed without slipping, and the mixed viscous material can be applied each time of the test or every several tests, so that the cost is low and the operation is extremely easy.

According to the second aspect, most of the hard particles bite into the contact surface of the main body of the chuck, and the remaining portion bites into the test body. Can be.

[Brief description of the drawings]

FIG. 1 is a cut-away side view showing a specific example of a chuck jaw for a tensile test applied with a viscous material containing hard particles according to the present invention for a round material in a used state.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a cut-away side view showing a specific example of a flat material of a chuck nail for a tensile test to which a viscous material containing hard particles according to the present invention is applied, in use.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a conceptual diagram of a partially cut state of a joint surface of a test body, hard particles, and a chuck when a tensile test is performed.

FIG. 6 is a view similar to FIG. 5 when the material of the chuck is softer than the material of the test sample.

FIG. 7 is a partially cut side view showing a conventional chuck jaw with a file and a test body.

FIG. 8 is a partially cut-away side view showing a conventional plated chuck jaw and a test body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hard particle 2 Viscous body 3 Mixed viscous body 4 Main body 4 'Main body T Specimen T' Specimen 5 Contact surface 5 'Contact surface

Claims (2)

[Claims] 1. A mixed viscous material (3) in which hard particles (1) such as diamond powder, alundum powder, carborundum powder, and hard metal powder are mixed with a viscous material (2) such as oils and fats, and an uncured adhesive. Is applied to the contact surface (5, 5 ') of the main body (4, 4') with the test body (T, T '), and a chuck jaw for a tensile test coated with a viscous body containing hard particles is applied. . 2. Hard particles (1) such as diamond powder, alundum powder, carborundum powder, and superhard metal powder, which are made of a material softer than the material of the specimen (T, T ') The mixed viscous material (3) mixed into the viscous material (2) such as a hardening adhesive is used to contact the test surface (T, T ') of the main body (5,
5 ') is applied and hard particles of the applied mixed viscous body (3)
(1) is that the majority of the bites are cut into the main body (4, 4 ') by the surface pressure, and the remaining part is bitten into the test body, and the innumerable hook points averaged over the entire contact surface (5, 5'). A chuck nail for a tensile test to which a viscous material containing hard particles is applied, the chuck nail being formed.