JPH1010025A - Two-shaft type material testing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately load a specimen without dislocating a central position of the specimen in a two-shaft type material testing machine. SOLUTION: A left screw 4A and a right screw 4B are formed in a screw pole 4 of a vertical load mechanism 1, and an upper cross head 5 and a lower cross head 6 are respectively theredably engaged with the respective screws 4A and 4B. Left screw and a right screw are formed in a screw pole 14 of a lateral load mechanism 10, and a left cross head 15 and a right cross head 16 are respectively threadably engaged with the respective screws. Chuck parts are installed on the respective cross heads 5 and 6 so as to be slidingly movable in the vertical direction or the lateral direction. Therefore, the upper and lower cross heads 5 and 6 and the left and right cross heads respectively and synchronously move, and move in the vertical and lateral direction according to deformation of a specimen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a biaxial material testing machine suitable for evaluating the performance by applying a load in the axial direction.

[0002]

2. Description of the Related Art A biaxial material testing machine is known which applies a load to a single specimen in two orthogonal directions (for example, a vertical direction and a horizontal direction). In such a material testing machine, upper and lower ends and left and right ends of a specimen such as a cloth are gripped by a chuck, and the gripped specimen is moved in at least one of the vertical direction and the horizontal direction of the specimen, or the vertical direction. In addition, the performance of the specimen is evaluated by applying a load in at least one of the left and right directions.

[0003]

However, when the specimen is loaded, the amount of movement of the chuck in the vertical and horizontal directions may vary depending on the state of the load on the specimen. In such a case, the center position of the specimen moves,
Since the load cannot be applied equally to the horizontal and vertical lines passing through the center of the specimen, the load of the specimen is partially different. Also, since the upper and lower ends and the left and right ends of the specimen are gripped by the chuck, the deformation of the specimen in the left and right direction is restrained by the upper and lower grips, and the deformation of the specimen in the vertical direction is gripped by the left and right grips. Be bound. Therefore,
The load on the specimen and the amount of deformation could not be accurately measured.

[0004] It is an object of the present invention to provide a biaxial material testing machine capable of accurately loading a specimen.

[0005]

FIG. 1 shows an embodiment of the present invention.
Referring to FIG. 5, the invention according to claim 1 is configured such that first and second gripping members 35A and 35B that grip upper and lower ends of a specimen T and left and right ends of the specimen T are separated. A plurality of divided second gripping members 35C, 35D to be gripped, first loading mechanisms 4, 5, 6, 7D for loading the specimen T on at least one of the vertical direction, and Second loading mechanism 14, 15, 1 for loading at least one
6, 11D, and the first and second gripping members 35A.
The above-mentioned object is achieved by making it possible to move .about.35D in the vertical and horizontal directions according to the displacement of the specimen T, respectively.

According to a second aspect of the present invention, the second load mechanism 14,
Extension members 17A, 1 extending in the left-right direction for attaching the second gripping members 35C, 35D to the tips.
7B, 18A, 18B and extension members 17A, 17B, 1
Regulating member 19 for regulating the vertical displacement of 8A, 18B
A, 19B.

According to the first aspect of the present invention, the first and the second
Specimen T gripped by gripping members 35A to 35D
Are the first and second load mechanisms 4, 5, 6, 14, 1
Loads are applied to at least one of the up and down directions and at least one of the left and right directions by 5, 16, 7D and 11D. In addition, since the first and second gripping members 35A to 35D are divided into a plurality of parts and are movable in the vertical and horizontal directions, respectively, the first and second gripping members 35A to 35D are respectively movable in the vertical and horizontal directions according to the deformation of the specimen T. It is divided and moves.

According to the second aspect of the present invention, the vertical displacement of the extension members 17A, 17B, 18A, 18B extending in the left-right direction, which constitute the second load members 14, 15, 16, 11D, is restricted. Regulated by 19A and 19B. Therefore, even if the specimen T breaks, the extension members 17A, 17B, 18A, and 18B do not suddenly move up and down due to the impact of the break.

In the meantime, in the section of the means for solving the above-mentioned problem which explains the constitution of the present invention, the drawings of the embodiments of the present invention are used in order to make the present invention easy to understand. However, the present invention is not limited to this.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a configuration of an embodiment of a biaxial material testing machine of the present invention, FIG. 2 is a side view showing a configuration of an embodiment of a biaxial material testing machine of the present invention, and FIG. FIG. 4 is a sectional view taken along line II of FIG. 3, FIG. 5 is a sectional view taken along line II-II of FIG. 3, and FIG. 6 is a view taken in the direction of arrow A in FIG. As shown in FIGS. 1 and 2, a biaxial material testing machine according to the present embodiment includes a vertical loading mechanism 1 for vertically loading a specimen such as cloth, and a left and right loading mechanism 10 for horizontally loading a specimen. And a chuck mechanism 20 for gripping the specimen T.

The vertical load mechanism 1 includes a pair of columns 2 from the floor surface.
, And a cross yoke 3 is laid on the upper side thereof. A screw rod 4 extends in the up and down direction (X direction) in the support 2 and is rotatably supported by a bearing (not shown).
The screw rod 4 has a left-hand thread 4A on the upper side and a right-hand thread 4B on the lower side. Both ends of the upper crosshead 5 are screwed to a left thread 4A of the screw rod 4, and both ends of the lower crosshead 6 are screwed to a right screw 4B of the screw rod 4. Therefore, when the screw rod 4 rotates, the upper and lower crossheads 5 and 6 move in directions different from each other. A table 7 is provided below the column 2 so as to be sandwiched between the columns 2, and an X-axis motor 7 </ b> D for driving the screw rod 4 is arranged in the table 7. The upper crosshead 5 has a load cell (not shown) and a joint 7A
The upper chuck slide member described later is fixed through
A lower chuck slide member is fixed to the lower crosshead 6 via a joint 7B.

Then, by driving the X-axis motor 7D to rotate the pair of screw rods 4, the upper crosshead 5 and the lower crosshead 6 move up and down in different directions in synchronization with each other. That is, when the upper crosshead 5 moves up, the lower crosshead 6 moves down, and when the upper crosshead 5 moves down, the lower crosshead 6 moves up.

As shown in FIGS. 1 and 2, the left and right load mechanism 10 has a pair of columns 12 erected from the floor surface, and a table 11 is laid horizontally on the upper portion thereof in the left and right direction (Y direction). In the table 11, a pair of screw rods 14 extend in the left-right direction, and are rotatably supported by bearings (not shown). The screw rod 14 has a left-hand thread 14A on the left and a right-hand thread 14B on the right. Left crosshead 15
The lower end is screwed to the left threaded portion 14A of the screw rod 14, and the right crosshead 16 is connected to the right threaded portion 14A of the screw rod 14.
B has its lower end screwed. Accordingly, when the screw rod 14 rotates, the left and right crossheads 15 and 16 move in directions different from each other. Guide rails 11A, 11B and 11C are provided on the upper surface of the table 11, and guide rails 11 are provided on the lower surfaces of the left and right crossheads 15 and 16.
A, 11B, engaging members 16A, 16 engaging with 11C
B, 16C (only the right crosshead is shown in FIG. 2). Thereby, the left and right crossheads 15, 1
Numeral 6 is slidable on the table 11 in the left-right direction of FIG.

On the right side of the table 11, a Y-axis motor 11D for driving the screw rod 14 is provided. A left chuck slide member, which will be described later, is fixed to the left crosshead 15 via a load cell (not shown), a rod 18A, and a joint 17A.
And the right chuck slide member is fixed via the joint 17B. The table 11 has a joint 1
Regulation members 19A and 19B for regulating the vertical displacement of 7A and 17B are provided upright.
A and 17B are holes 3 formed in the regulating members 19A and 19B.
4A and 34B.

The left crosshead 1 is driven by driving the Y-axis motor 11D to rotate the pair of screw rods 14.
5 and the right crosshead 16 move in different directions in synchronization with each other. That is, in FIG. 2, when the left crosshead 15 moves to the left, the right crosshead 16 moves to the right, and when the left crosshead 15 moves to the right, the right crosshead 16 moves to the left.

As shown in FIGS. 3 to 5, the chuck mechanism 2
0 is the joint 7 attached to the upper crosshead 5
A, the upper chuck slide base 22A connected by the connecting pin 21A, the joint 7B mounted on the lower crosshead 6, the lower chuck slide base 22B connected by the connecting pin 21B, and the joint mounted on the left crosshead 15. 17A and the left chuck slide base 22C connected by the connecting pin 21C, and the right crosshead 1
6 and the connecting pin 21D attached to
And a right chuck slide base 22D connected by the. Connecting pin 2 of each chuck slide base 22A to 22D
Mounting parts 23A to 23D for mounting 1A to 21D
Is thicker than other parts as shown in FIG. 6 in order to improve strength. This mounting portion 23A
3D protrude rearward in FIG. 3 on the upper and lower chuck slide tables 22A and 22B, and protrude forward on the left and right chuck slide tables 22C and 22D. The upper and lower chuck slide tables 22A and 22B and the left and right chuck slide tables 22C and 22D are combined in a grid so that the displacement of each chuck slide table is not restricted.

Here, each of the chuck slide tables 22A to 22A
Since the configuration of each of the chuck portions 35A to 35D attached to 2D is the same, only the configuration of the chuck portion 35A will be described here. As shown in FIG. 4, the chuck section 35A includes four chuck bodies 24A to 24D and chuck screws 25A to 2
Chuck teeth 26A detachably attached by 5D
~ 26D. In addition, each chuck screw 25A-2
5D is a disc spring 27A to 27D (only 27B is shown in FIG. 5).
The chuck teeth 26A to 26D are attached to the chuck teeth 26A to 26D through
A to 24D are fixed. Each chuck body 24A-2
On the surface facing the upper chuck slide base 22A of 4D,
A linear guide 28 is attached, and a guide rail 29 extending in the longitudinal direction of the slide table is attached to the upper chuck slide table 22A. When the linear guide 28 is fitted on the guide rail 29, the chuck bodies 24A to 24D, that is, the chuck teeth 26A to 26D can slide in the longitudinal direction of the upper chuck slide base 22A (the left-right direction in FIG. 3). Attached to.

In order to prevent the chuck main bodies 24A to 24D from moving when the specimen T is gripped, the chuck temporary fixing members 31A to 31D and the chuck temporary fixing screws 32A, 3
2B, the chuck bodies 24A to 24D and the upper chuck slide base 22A are fixed. The chuck slide bases 22A to 22D can be fixed to the joints 7A, 7B, 17A, 17B by chuck slide base fixing nuts 33A to 33D so that the chuck slide bases 22A to 22D do not tilt when the specimen T is gripped. Have been.

Next, the operation of the present invention will be described.
First, the X-axis motor 7D and the Y-axis motor 11D are driven to move the upper, lower, left and right chuck slide tables 22A to 22D to positions suitable for the shape of the specimen T. At this time, each of the chuck bodies 24A to 24D is attached to the chuck temporary fixing member 31.
Each chuck slide table 22A-22D by A-31D
Fixed to Then, each of the chuck screws 25A to 25D
The chuck bodies 24A to 24D and the chuck teeth 26
A gap for chucking the specimen T is formed between the specimen T and the chuck teeth 26A to 26D.
And the chuck bodies 25A to 24D, and the chuck screws 25A to 25D are fastened to fix the specimen T to the chuck bodies 24A to 24D.

When the X-axis motor 7D and the Y-axis motor 11D are rotated in a predetermined direction after gripping the specimen T, the screw rod 4 in the column 2 is rotated and the upper and lower crossheads 5, 6 are moved away from each other. Along with the movement, the screw rod 14 in the table 11 rotates and the left and right crossheads 15 and 16 move in a direction away from each other. Thereby, the chuck 35
A to 35D are top, bottom, left and right crossheads 5, 6, 15, 16
And a tensile load is applied in the vertical and horizontal directions of the specimen T.

As described above, when the tensile load is applied, the specimen T extends and deforms in the vertical and horizontal directions. In this embodiment, the number of the chuck bodies 24A to 24D and the number of the chuck teeth 26A to 26D are reduced to four. Since it is divided and slidable in the longitudinal direction of each of the chuck slide tables 22A to 22D, the chuck bodies 24A to 24D and the chuck teeth 26A according to the deformation of the specimen T as shown in FIG.
26D moves, and the specimen T can be deformed without any restriction according to the applied load. When a load is applied to the specimen T, the upper and lower crossheads 5 and 6 and the left and right crossheads 15 and 16 move in synchronization with each other. It does not move in accordance with the movement of 16. Therefore, a tensile load is uniformly applied to the specimen T in the up, down, left, and right directions, so that the specimen T can be accurately loaded.

The specimen T is broken by applying the specimen T to its breaking load. At this time, the left and right joints 17A, 17B and the rods 18A, 18B
Tries to move sharply in the vertical direction due to the impact of breaking, but in the present embodiment, the regulating members 19A, 19B
The displacement of the joints 17A and 17B in the vertical direction is restricted by the
7A and 17B and the rods 18A and 18B do not suddenly move in the vertical direction.

In the above embodiment, the upper and lower crossheads 5, 6 and the left and right crossheads 1 and 6 are driven by driving the X-axis motor 7D and the Y-axis motor 11D.
5 and 16 are simultaneously moved in synchronization with each other, but only one of the upper and lower crossheads 5 and 6 and one of the left and right crossheads 15 and 16 are driven to load the specimen T. Material testing machine
The split chuck teeth described above can be used.

Further, in the above embodiment, the chuck bodies 24A to 24D attached to the chuck slide tables 22A to 22D are divided into four parts, but the number of divisions may be variously changed according to the shape of the specimen T. Can be changed. For example, in the above embodiment, 200 × 200 (m
m) Assuming that a rectangular specimen T having a square shape is to be gripped, the chuck body is divided into three parts as shown in FIG. 8 in order to grip a 150 × 150 (mm) square specimen T. In order to hold the specimen T of 100 × 100 (mm), the chuck body may be divided into two as shown in FIG.

In the correspondence between the above embodiment and the claims, the chuck portions 35A and 35B serve as the first holding members, the chuck portions 35C and 35D serve as the second holding members, the screw rod 4, the upper cross head 5 and the upper cross head 5. , The lower crosshead 6 and the X-axis motor 7D serve as the first load mechanism, and the screw rod 14, the left crosshead 15, the right crosshead 16 and the Y-axis motor 11D
Constitute the second load mechanism, and the joints 17A and 17B and the rods 18A and 18B constitute extension members, respectively.

[0026]

When a specimen is loaded on a biaxial material testing machine, the specimen expands and deforms in the vertical and horizontal directions.
In the present invention, since the first and second gripping members are divided into a plurality of parts and are movable in the vertical and horizontal directions according to the displacement of the specimen, the first and second gripping members are moved according to the deformation of the specimen. As the second gripping member moves, the distance between the second gripping member and the second gripping member can be increased or decreased, so that the specimen can be deformed without any restriction according to the applied load. In addition, when the specimen is loaded, the first
The loading mechanism of (1) simultaneously loads the specimen vertically and the second loading mechanism simultaneously loads the specimen left and right, so that the center point of the specimen does not move according to the displacement of the specimen.
For this reason, since a load is evenly applied to the specimen in the up, down, left, and right directions, the specimen can be accurately loaded.

The specimen T is broken by applying the specimen to its breaking load. In the case where the extension member of the second load mechanism is provided, the extension member tends to move rapidly in the vertical direction due to the impact of the breakage of the test piece. The vertical displacement of the extension member is thereby restricted, so that the extension member does not suddenly move in the vertical direction even if the specimen T breaks.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a biaxial material testing machine according to an embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a biaxial material testing machine according to an embodiment of the present invention.

FIG. 3 is a diagram showing a detailed configuration of a chuck unit.

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

FIG. 5 is a sectional view taken along line II-II of FIG. 3;

FIG. 6 is a view in the direction of arrow A in FIG. 3;

FIG. 7 is a diagram showing a state in which a gap between chuck portions is wide;

FIG. 8 is a diagram showing another embodiment of the chuck portion.

FIG. 9 is a view showing still another embodiment of the chuck portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical loading mechanism 2 Prop 3 Cross yoke 4, 14 Screw rod 5 Upper crosshead 6 Lower crosshead 7, 11 Table 7A, 7B, 17A, 17B Joint 10 Left and right loading mechanism 15 Left crosshead 16 Right crosshead 18A, 18B Rod 19A, 19B Restriction member 20 Chuck mechanism 22A to 22D Chuck slide table 24A to 24D Chuck body 26A to 26D Chuck teeth 35A to 35D Chuck section

Claims (2)

[Claims] 1. A first gripping member divided into a plurality of pieces for gripping upper and lower ends of a specimen, and a second divided piece gripping left and right ends of the specimen.
And a first member for loading the specimen on at least one of the vertical direction.
A second loading mechanism for loading the specimen in at least one of the left and right directions.
A biaxial material testing machine, wherein the first and second gripping members are movable in the vertical and horizontal directions, respectively, according to the displacement of the specimen. 2. The apparatus according to claim 2, wherein the second load mechanism is provided at a tip thereof with the second load mechanism.
2. The biaxial material testing machine according to claim 1, further comprising: an extension member extending in the left-right direction for attaching the gripping member; and a regulating member regulating the vertical displacement of the extension member. 3.