JP2000131205A - Material testing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a material testing machine having an excellent operability and a high precision of measurement, which can precisionally perform position adjustment for a pair of supports supporting a sample material to fix. SOLUTION: This machine is provided with an electric motor driving a feed screw 4 allowing to move on a pedestal 1 a pair of supports 2 supporting a sample material on their two points, a hydraulic cylinder 16 driving a chamber immovably fixing the carriers 2 onto a base 1; and a control device controlling the motor and the cylinder 16 associated with each other. Then, fixing of the supports 2 by operating the hydraulic cylinder is inhibited when the electric motor is operated, while the operation of the electric motor is inhibited when the supports 2 are fixed on the pedestal 1 by operating the hydraulic cylinder. Operation of a load device is allowed only when the supports 2 are surely fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to easily and surely set a supporting position of a test material to be subjected to a bending test, and to facilitate the work of attaching and detaching the test material.
The present invention relates to a material testing machine capable of improving the measurement accuracy even when a bending test is repeatedly performed.

[0002]

[Related Background Art] Bending test of test materials such as steel
For example, a long test material (test piece) is supported at two points separated by a predetermined test distance, and a predetermined bending load is applied to the test material from a perpendicular direction at a center position between the support points. . Incidentally, the bending test is performed by adjusting the supporting position, that is, the distance between the supporting points (test distance) according to the type and shape of the test material. For this reason, this kind of bending test material testing machine is provided with the pair of supports movably along a linear guide on a predetermined base. Then, after each support is moved to a support position that defines the test distance in advance, the support can be fixed at the position.

[0003]

In the conventional material testing machine of this type, the pair of supports are brought into contact with and separated from each other along the aforementioned linear guide by using a feed screw driven exclusively by a handwheel. To be moved. Then, the base is sandwiched between the bolt and a nut (T-groove nut) by a bolt fastening mechanism incorporated in the support, thereby fixing the support on the base. ing. However, when the bolts in the bolt fastening mechanism are tightened using a tool such as a screwdriver, unintended force is easily applied to the support by touching the support or the like, so that the fixing position of the support is likely to shift. There is a problem to say. In addition, there is a possibility that the fixing of each support to the base is insufficient or that the fixing operation is forgotten.
By the way, if a bending load is applied to the test material while the support is not sufficiently fixed, there is a possibility that the support may rattle or the test material may come off from the support due to the displacement.

In addition, since the handwheel is generally provided on the side of the base, each time the handle is turned around the side of the base and the handle is operated to adjust the position of the pair of supports. It is necessary to. Note that the position of the support is directly confirmed using a scale attached to the base. In addition, since it is necessary to perform the work of fixing each support to the base away from the operating position of the handle, there is also a problem that the workability is extremely poor.

The present invention has been made in view of such circumstances, and has as its object to adjust the position of a support for supporting a test material with high precision, to fix the support, to provide excellent workability, and to perform measurement. It is an object of the present invention to provide a material testing machine capable of improving accuracy.

[0006]

In order to achieve the above-mentioned object, a material testing machine according to the present invention is provided movably on a base and separates a test material to be subjected to a bending test by a predetermined distance. A pair of supports each supporting at two points, and a load device for applying a predetermined bending load to the test material supported by the supports, and in particular, the test is performed by moving the supports. A moving mechanism for adjusting the distance between the support points with respect to the material, a fixing mechanism for immovably fixing the support on the base, and a control device for controlling the operation of the moving mechanism and the fixing mechanism in association with each other. It is characterized by having been provided.

In a preferred aspect of the present invention, the moving mechanism is attached to the support, for example, and is screwed to a feed screw. A feed nut that moves in the axial direction and an electric motor that rotationally drives the feed screw are configured.On the other hand, the fixing mechanism is attached to the support, sandwiches the base, and fixes the support to the base. A clamper to be fixed,
The clamper is configured as a hydraulic cylinder or an electromagnetic plunger, and the operation of the electric motor and the operation of the hydraulic cylinder or the electromagnetic plunger are controlled under the control device in association with each other. I have.

According to a third aspect of the present invention, the pair of supports are provided so as to be able to move away from each other along a linear guide provided on a base in opposite directions, and the pair of supports are moved by the moving mechanism. It is preferable that the supports are moved in opposite directions in association with each other. Further, in the control device, as described in claim 4, when the moving mechanism is operated, the fixing of the support to the base by the operation of the fixing mechanism is prohibited, and the support is performed by the operation of the fixing mechanism. When the body is fixed to the base, the operation of the moving mechanism is prohibited.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a material tester for a bending test according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic overall configuration of a material testing machine, in which (a) is a plan view and (b) is a front view. The T-shaped base 1 has left and right wing portions as support portions for a pair of supports 2, and a central wing portion provided at right angles to the left and right wing portions as a support portion for the load device 3. It is. The base 1 has two straight guide grooves 1 extending over the left and right wings.
The support members 2, 2 are provided so as to be movable along these linear guide grooves 1a, 1b. Incidentally, each of the above-mentioned supports 2, 2 is a rod-shaped test material (test piece) S to be subjected to a bending test, and a predetermined test distance L
The test material S is supported at two points separated by an equal distance (L / 2) on the left and right sides of the point of application of the bending load applied to the test material S by the load device 3. It is positioned to support.

On the back side of the base 1, feed screws 4, 4 are provided along the linear guide grooves 1a, and the supports 2, 2 are provided on the back side of the base 1. The projecting feed nuts 5, 5 are screwed into the feed screws 4, 4, respectively. Each of the supports 2, 2 has a feed screw 4,
With the movement of the feed nuts 5, 5 in the axial direction by the rotation of 4, the position of the feed nuts 5, 5 is adjusted by linearly moving along the linear guide grooves 1a. The feed screws 4, 4 are connected to each other, and are driven to rotate integrally as one axis by receiving a rotational force from an electric motor 6 incorporated at an end thereof.

In particular, the screw directions of the feed screws 4, 4 are set to be opposite to each other, so that the feed nuts 5, 5 (supports 2, 2) are rotated by the rotation of the feed screws 4, 4.
They come and go by moving in opposite directions in conjunction with each other. Therefore, by controlling the rotation direction and the rotation angle of the feed screws 4, 4 by the electric motor 6, the feed nuts 5, 5 (supports 2, 2) move uniformly in opposition to each other. Is adjusted (test distance L). In the figure, reference numeral 7 denotes a pulley mechanism for connecting the feed screws 4, 4 and the electric motor 6.

On the other hand, the load device 3 described above is supported by a bearing 3a and is provided with a rod 3b provided to be able to advance and retreat in a direction perpendicular to the test material S. A fulcrum roller 3c that applies a load to S
And a hydraulic actuator 3d for applying the predetermined bending load to the fulcrum roller 3c via the rod 3b. The bending load applied to the test material S by the load device 3 is equal to the hydraulic actuator 3d.
The load is detected by a load cell 3e provided between the rod 3b and the load cell 3e, and is displayed on a display unit thereof while being monitored by a measuring unit (not shown).

Here, the specific structure of the above-described support 2 will be described with reference to FIG. FIG. 2A is a partial plan view showing a state of the support 2 incorporated on the base 1, and FIG. 2B is a partial cross-sectional view thereof. This support 2
The holder 1 is placed on a pedestal 11 placed on the base 1.
It has a structure in which a pair of rollers 13, 13 rotatably supported by 2 and 12, respectively, are provided facing each other. Each of the rollers 13, 13 has a thread-wound shape, and plays a role of holding the test material S therebetween. Incidentally, the holder 12 holding one roller 13 is fixedly mounted on the pedestal 11, while the holder 12 holding the other roller 13 is capable of adjusting the facing distance between the rollers 13, 13. It is slidably provided on the pedestal 11. The other holder 12 is slide-controlled by turning a spacing adjustment bolt 15 incorporated in a wall 14 erected on the pedestal 11, whereby the roller 1 is rotated.
The opposing distance between 3, 13 (the sandwiching interval of the test material S) is adjusted.

The pedestal 11 has a projection 11a projecting from the lower surface thereof.
a so as to be movably mounted on the base 1 along the linear guide groove 1a. The feed nut 5 screwed to the feed screw 4 is fixed to and integrated with the projection 11a. Support 2
Is connected to the feed screw 4 via the feed nut 5 on the back side of the base 1 in this manner, so that the base is moved along the linear guide groove 1a with the rotation of the feed screw 4. 1 to move linearly.

On the other hand, hydraulic cylinders 16, 16 are incorporated on both sides of the holder 12 of the pedestal 11. The hydraulic cylinder 16 is provided with a through hole 1 formed in the base 11 through an actuator 16a driven forward and backward by hydraulic pressure.
The actuator 16a is inserted into the linear guide groove 1b of the base 1 via the base 1b, and a tightening nut (T-slot nut) 17 is attached to the tip of the actuator 16a. The hydraulic cylinder 16 firmly sandwiches the base 1 between the flange portion of the tightening nut 17 attached to the tip thereof and the lower surface of the pedestal 11 by retracting the actuator 16 a by its operation, thereby supporting the hydraulic cylinder 16. It functions as a clamper for fixing the body 2 on the base 1. By the way, when the hydraulic pressure for the hydraulic cylinder 16 is released, the actuator 16a is lowered by its own weight. As a result, the clamping of the base 1 by the fastening nut 17, that is, the fixing of the support 2 to the base 1 is released, and the movement thereof is permitted.

The operation of the above-described hydraulic cylinder 16 is controlled by a hydraulic circuit 18 configured as shown in FIG. 3, for example, and particularly by an electromagnetic valve 18a. In particular, a pressure switch 18b is incorporated in the hydraulic circuit 18, and the operation state of the hydraulic cylinder 16, that is, the fixed state of the support 2, is monitored from the output of the pressure switch 18b. That is, from the operating state of the pressure switch 18b, it is determined whether or not the support 2 is firmly and securely fixed on the base 1 by the operation of the hydraulic cylinder 16.

Next, a description will be given of a movement control device for controlling the movement of the support 2 having the above-mentioned structure on the base 1. FIG. This movement control is executed, for example, according to a control procedure shown in FIG. That is, after the power switch of the material testing machine is turned on (on) [Step S1], the fulcrum moving switch is turned on to adjust the position of the pair of supports 2 (the interval L between the test materials S). In response, the operation of the hydraulic cylinder 16 is prohibited [step S3]. That is, the fixing of the pair of supports 2 on the base 1 by the operation of the hydraulic cylinder 16 is prohibited.

In this state, the operation of the electric motor 6 is controlled, and the feed screw 4 is driven to move the pair of supports 2, 2 in conjunction with each other to adjust the position of the supports 2, 2 Support position of test material S by body 2, 2 (fulcrum;
The sandwiching interval L) of the test material S is set [Step S4]. The position adjustment of the supports 2, 2 is performed, for example, while checking the moving position of the supports 2, 2 by a scale attached to the base 1, and the electric motor 6 is controlled by a step motor. This may be performed while controlling the rotation angle of the feed screw 4 by the motor, and thus the moving distance of the feed nut 5 (support 2) from a preset reference position.

When the position of the pair of supports 2, 2 (the sandwiching distance L of the test material S) is adjusted as described above, the fulcrum movement switch is turned off (step S5). When the fulcrum shift switch is turned off (off), the operation inhibition of the hydraulic cylinder 16 described above is released, so that the solenoid valve 18a of the hydraulic circuit 18 described above is fixed to fix the supports 2, 2 at the adjustment position. To operate (turn on) the hydraulic cylinder 16 [Step S6].

At this time, the operation of the pressure switch 18b is monitored to determine whether or not the pressure applied to the hydraulic cylinder 16 reaches a predetermined value and the pressure switch 18b is turned on. It is determined whether or not the supports 2, 2 are securely and firmly fixed on the base 1 [Step S7]. And pressure switch 1
When it is confirmed from the output of 8b that the supports 2, 2 are fixed on the base 1, this time, the movement of the supports 2, 2 is prohibited by prohibiting the operation of the electric motor 6 [ Step S8]. After such a series of processing is completed, the test material S is mounted on the supports 2, 2 and the above-described load device 3 is operated to start the bending test [step S9].

Thus, according to the material testing machine configured as described above, it is possible to easily move the pair of supports 2 on the base 1 by driving control of the electric motor 6 and adjust the positions thereof. Moreover, the pair of support members 2, 2 whose positions have been adjusted
Can be firmly and reliably fixed on the base 1 by driving the hydraulic cylinder 16 incorporated in the supports 2, 2. In particular, the hydraulic circuit 18 is operated, and the hydraulic cylinder 16 incorporated in the supports 2, 2 is remotely driven to secure the supports 2, 2 to the base 1.
The supports 2, 2 are not touched during the fixing operation, and therefore, there is no possibility that the positions of the supports 2, 2, whose bending angles have been adjusted, are shifted with the fixing operation.

According to the above-mentioned material testing machine, the operation of the hydraulic cylinder 16 is prohibited when the electric motor 6 is driven, and the driving of the electric motor 6 is prohibited when the hydraulic cylinder 16 is operated. In other words, only when the hydraulic cylinder 16 is in the off state and the pair of supports 2 are not fixed to the base 1, the operation of the electric motor 6 is permitted and the position of the supports 2 Adjustments are made. And the electric motor 6
Is turned off and the operation of the hydraulic cylinder 16 is permitted only in a state where the operation is stopped. On the contrary, the hydraulic cylinder 16 is operated and the fixing of the supports 2 and 2 to the base 1 is confirmed from the operating pressure. When the electric motor 6
Operation is prohibited. Thereafter, the operation of the electric motor 6 is prohibited, and the operation of the load device 3 is permitted only in a state where the supports 2, 2 are firmly fixed on the base 1 by the operation of the hydraulic cylinder 16. Thus, a bending test is performed on the test material S.

Therefore, the supports 2, 2 supporting the test material S
The bending test is no longer performed while the position of is unstable, and the bending test is performed only when the test material S is stably supported at the predetermined support position. In particular, since the load device 3 is operated after confirming the fixed state of the supports 2 and 2 with respect to the base 1 from the operating pressure of the hydraulic cylinder 16, the supports 2 and 2 are screwed.
As seen in the conventional material testing machine in which the fixing is performed, there is no risk of forgetting to screw the supports 2 and 2 or performing the bending test while the fixing is insufficient. Therefore, the bending test can be performed safely and stably. Therefore, even in the case where various test materials S are repeatedly subjected to a bending test while adjusting the positions of the supports 2, 2, the position (test distance L) of the supports 2, 2 can be accurately defined. , The measurement accuracy can be sufficiently improved.

Further, when the position is adjusted by moving the pair of supports 2, 2, it is not necessary to manually turn the handle as in the prior art. For example, the support 2 is read while reading the scale mark on the front of the base 1. , 2 can be executed, and after positioning, the hydraulic cylinder 1
Since it is only necessary to operate the support 6 and fix the supports 2 and 2 collectively on the base 1, there is an advantage that the workability is extremely good.

The present invention is not limited to the above embodiment. In the embodiment, the position is adjusted by moving the pair of supports 2 and 2 using the feed screw 4 driven by the electric motor 6, but using an endless flexible body such as a chain or a belt. It is also possible to carry out the movement. Further, the pair of supports 2 may be moved by using, for example, a hydraulically driven linear actuator or a linear motor.

It is of course possible to use an electromagnetic plunger instead of the hydraulic cylinder 16 incorporated as a fixing mechanism for the supports 2,2. Further, regarding the operation control procedure, for example, only when the operation of the hydraulic cylinder is prohibited, the operation of the electric motor is permitted, or the operation of the hydraulic cylinder is permitted on condition that the electric motor is not operating. You may do it. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0027]

As described above, according to the present invention, a pair of supports respectively movably provided on a base and supporting a test material to be subjected to a bending test at two points separated by a predetermined distance. A moving mechanism for moving the body, and a fixing mechanism for immovably fixing the support on the base, and controlling the operations of the moving mechanism and the fixing mechanism in association with each other, so that the test material Can be stably executed. Therefore, even when the bending test is repeatedly performed while adjusting the position of the support, the measurement accuracy can be sufficiently increased.

In particular, the moving mechanism is constituted by a feed screw and a feed nut screwed by the feed screw when driven by an electric motor, while the fixing mechanism is constituted by a hydraulic cylinder or a clamper driven by an electromagnetic plunger. The operation of the moving mechanism inhibits the fixing of the support to the base by the operation of the fixing mechanism, and prohibits the operation of the moving mechanism when the support is fixed to the base by the operation of the fixing mechanism. In addition, since the operation of the load device is permitted when it is confirmed that the support is fixed to the base by the operation of the fixing mechanism, the bending test on the test material can be performed stably and reliably under a simple operation. A great effect such as that it is possible to implement the present invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall schematic configuration of a material testing machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic structure of a support incorporated in the material testing machine shown in FIG. 1 and a structure for attaching the support to a base.

3 is a diagram showing a configuration example of a hydraulic circuit that controls the operation of a hydraulic cylinder in the material testing machine shown in FIG.

FIG. 4 is a diagram showing an example of a processing control procedure in the material testing machine shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 base 1a linear guide groove 1b linear guide groove 2 support 3 load device 4 feed screw 5 feed nut 6 electric motor 11 pedestal 12 holder 13 roller 16 hydraulic cylinder 17 tightening nut (clamper) 18 hydraulic circuit 18a pressure switch

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noboru Ikenaga 4-15-14 Nihonbashi, Naniwa-ku, Osaka-shi, Japan J-Toshi Corporation F-term (reference) 2G061 AA07 AB01 CB02 CC09 DA10 EA01 EB05 EC04

Claims (4)

[Claims] 1. A pair of supports movably provided on a base and supporting a test material to be subjected to a bending test at two points separated by a predetermined distance, respectively, and A moving mechanism for adjusting a distance between support points with respect to a test material; a fixing mechanism for immovably fixing the support on the base; and a load for applying a predetermined bending load to the test material supported by the support. A material testing machine comprising: a device; and a control device that controls operations of the moving mechanism and the fixing mechanism in association with each other. 2. A feed nut attached to the support, screwed onto the feed screw and moved in the axial direction of the feed screw with rotation of the feed screw, and rotating the feed screw. An electric motor for driving, the fixing mechanism is attached to the support, a clamper sandwiching the base and fixing the support to the base, and a hydraulic cylinder or an electromagnetic plunger for operating the clamper. The material testing machine according to claim 1, comprising: 3. The pair of supports are provided so as to be able to move away from each other in opposition to each other along a linear guide provided on a base. The material testing machine according to claim 1, wherein the support members are moved in opposite directions in association with each other. 4. The control device inhibits fixing of the support to the base by the operation of the fixing mechanism when the moving mechanism is operating, and causes the support to move to the base by the operation of the fixing mechanism. Prohibiting operation of the moving mechanism when fixed to the base, and permitting operation of the load device when it is confirmed that the support is fixed to the base by operation of the fixing mechanism. The material testing machine according to claim 1, wherein