JP4240176B2 - Multiple torsional fatigue testing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a torsional fatigue testing machine for conducting a torsional durability test of various parts and materials. More specifically, the present invention relates to a multiple torsional fatigue test capable of performing a torsional fatigue test of a plurality of specimens by a single test. Related to the machine.
[0002]
[Prior art]
Conventionally, as a testing machine for investigating the torsional durability of various parts and materials, a torque load unit having a rotatable holding tool and a torque actuator for applying torsional torque to the holding tool on a load frame, And a reaction force portion having a holder that is non-rotatably provided on the load frame so as to face the holder of the torque load portion, and hold the torque load portion and the reaction force portion at both ends of the specimen, respectively. There is known a torsional fatigue testing machine in which a torsional torque is repeatedly applied to a specimen by driving a torque actuator in a state of being attached to a tool.
[0003]
In this type of testing machine, in general, the torque acting on the specimen is detected by a torque detector, and the torque actuator is feedback-controlled by the detected value to control the specimen so that accurate repeated torque acts on the specimen. The number of cycles until the specimen is destroyed and the change in rigidity before and after the torsional torque of a predetermined cycle acts are investigated.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional torsional fatigue testing machine as described above, one test piece is attached between the torque load portion and the reaction force holder, so that the test is performed by one test. When only a test can be performed and it is necessary to collect a large number of sample data under the same conditions, there is a problem that much time and labor are required. Here, in order to solve such a problem, it is possible to shorten the test time by increasing the torsional torque repetition frequency. In this case, however, there are adverse effects caused by the test speed and frequency, such as heat generation and resonance. It may occur and there are limits depending on the type of specimen. In addition, in a torsional fatigue testing machine that controls the torque actuator using an electrohydraulic servomechanism, an energy loss that depends on the frequency response characteristics of the control system occurs.
[0005]
The present invention has been made in view of such circumstances, and a torsional fatigue test of a plurality of specimens can be performed by a single test, and the efficiency of the torsional fatigue test can be improved. The object of the present invention is to provide a multiple torsional fatigue testing machine capable of reducing the installation space and cost compared to the case of installing a plurality of fatigue testing machines.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a multiple torsional fatigue testing machine according to the present invention comprises a rotating side holder that is rotatably supported on a load frame and holds one end of a specimen, and the rotating side holding device. A reaction force having a torque load section having a hydraulically driven torque actuator for applying a torsional torque to the tool, and a fixed-side holder provided on the load frame so as to be unrotatable facing the rotation-side holder parts and its provided in a counter-force unit, the torsional fatigue testing machine equipped with a torque detector for detecting torque acting on the specimen whose both ends are held between the both holders, the torque load section and the reaction force One intermediate bearing is provided on the load frame between the two parts , and the intermediate bearing is coaxially opposed to the rotating side holder and the fixed side holder at both ends. The holder that holds the end of the specimen is fixed. Two specimens, in which the attached intermediate shaft is rotatably supported and held in series between the holders at both ends of the intermediate shaft and the holders of the torque load portion and the reaction force portion by driving the torque actuator. twisting each torque from being characterized by being configured so as to transmit the.
[0007]
The present invention, by receiving the two specimens between torque load section and the reaction force unit is supported in series, the torque generated by the torque load unit reaction force unit through two specimen thereof, 2 The same torsional torque is applied to two specimens to achieve the intended purpose.
[0008]
That is, by providing a single intermediate bearing between the torque load section and the reaction force unit, in a configuration that supports rotatably the intermediate shaft holder is fixed at both ends, pivoted side of the torque load portion One end of one specimen is held between the holding tool and the holding tool of the intermediate shaft opposite to the holding tool, and the other test piece is provided between the holding tool on the opposite side of the intermediate shaft and the holding tool on the reaction force side. When the torque actuator is driven with both ends of the specimen held, the torsional torque generated from the torque actuator is transmitted to the reaction force section through the holding tool of the torque load section, the specimen, the intermediate shaft, and another specimen. Is done. At this time, since the torque from the torque load portion to the reaction force unit is the same, it is possible to act the same load to each specimen. Moreover, the required space and cost can be reduced as compared with the case where a plurality of conventional test machines are provided, such as only one torque actuator and one reaction force portion.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a plan view of its mechanical components.
[0010]
A hydraulically driven torque actuator 21 is mounted on the load frame 1, and a specimen holder 3 a is fixed to an output shaft 22 of the torque actuator 21. Yes. On the load frame 1, an intermediate bearing 4 and a reaction force portion 5 are attached. An intermediate shaft 41 is rotatably supported by the intermediate bearing 4, and specimen holders 3 b and 3 c are fixed to both ends of the intermediate shaft 41. The reaction force portion 5 includes a support base 51 fixed to the load frame 1 and a specimen holder 3d fixed to the support base 51. The reaction base 5 includes a support base 51 and a specimen holder 3d. A torque detector 6 is interposed between them.
[0011]
The intermediate shaft 41 is arranged coaxially with the output shaft 21 of the torque actuator 2, so that the specimen holder 3 b fixed to the end of the intermediate shaft 41 on the torque load portion 2 side holds the specimen of the torque load portion 2. The tool 3a is opposed to each other on the same axis. Further, the specimen holder 3d of the reaction force portion 5 is disposed so as to be coaxially opposed to the specimen holder 3c on the reaction force portion 5 side of the intermediate shaft 41.
[0012]
Each of the specimen holders 3a to 3d is for holding both ends of the specimen W, and the holders 3a and 3b and the holders 3c and 3d form a pair, respectively. It has a structure that can hold one end and the other end.
[0013]
The torque actuator 21 operates when pressure oil supplied from the hydraulic unit 71 is supplied via the servo valve 72, and the servo valve 72 has its valve opening gradually changed by a control signal supplied from the control device 73. Be controlled. The control device 73 takes in the torque detection output from the torque detector 6 every moment, and controls the valve opening degree of the servo valve 72 so that the momentary detection output coincides with a preset target value signal of repeated torque. It is configured.
[0014]
When the above embodiment of the present invention is used, the specimen W is attached between the specimen holders 3a and 3b and between the specimen holders 3c and 3d. In this state, when the torque actuator 21 is driven via the servo valve 72 according to a command from the control device 73, the torque generated by the torque actuator 21 is the specimen holder 3a, one specimen W, the specimen holder 3b, and the intermediate. The shaft 41, the specimen holder 3c, the other specimen W, the specimen holder 3d, and the torque detector 6 are transmitted to the support base 51 of the reaction force portion 5. Therefore, the two specimens W, will act equal torque to each other physician can perform exactly the same torsional fatigue testing for two specimens W by examination of one degree. Here, the intermediate bearing 4 also has a function of preventing the weight of one specimen W and the intermediate shaft 41 from acting as a bending load on the other specimen W, and the conventional torsional fatigue testing machine Equivalent accurate tests can be performed.
[0015]
Incidentally, in the above implementation, if it is necessary to detect the torque acting on the individual specimen W separately, it may be provided a torque detector to the medium between axes in addition to the reaction force unit 5 .
[0016]
【The invention's effect】
As described above, according to the present invention, an intermediate bearing is provided between the torque load portion and the reaction force portion, and a holder for holding the end portion of the specimen is fixed to both end portions of the intermediate bearing. The torque generated by driving the torque actuator in a state where both ends of the specimen are attached between the torque load section, the intermediate shaft, and the reaction force section is supported by each of the specimens. because configured to equally be transmitted to, it is possible to perform a torsional fatigue test under the same conditions on two specimens by the test of 1 degree. As a result, it is possible to reduce the number of times the test conditions are set and to shorten the test time even when the power consumption of the tester is the same when testing a specimen having a test frequency limit.
[0017]
And according to the present invention, compared to the case where a plurality of conventional torsional fatigue testing machines are installed, the torque actuator and the reaction force part can be made common, so that the installation space can be reduced, Further, it is advantageous in terms of cost. In addition, energy loss that depends on the test frequency and test speed can be reduced compared with the case where the test frequency and test speed of the conventional torsional fatigue testing machine is increased, which can improve the energy efficiency of the test. it can.
[Brief description of the drawings]
FIG. 1 is a front view of an embodiment of the present invention.
FIG. 2 is a plan view of mechanical components of the embodiment of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Load frame 2 Torque load part 21 Torque actuator 22 Output shaft 3a-3h Specimen holder 4, 4a-4d Intermediate bearing 41, 41a-41d Intermediate shaft 5 Reaction force part 6, 6a, 6b Torque detector 71 Hydraulic unit 72 Servo valve 73 Control unit W Specimen

Claims (1)

A torque load section having a rotation side holding tool that is rotatably supported on the load frame and holds one end of the specimen, and a hydraulically driven torque actuator that applies torsional torque to the rotation side holding tool And a reaction force portion having a fixed-side holder that is provided on the load frame so as not to rotate on the load frame, and the reaction force portion is provided with both ends between the holders. In a torsional fatigue testing machine equipped with a torque detector for detecting torque acting on a held specimen,
One intermediate bearing is provided on the load frame between the torque load portion and the reaction force portion, and the intermediate bearing has both the rotation side holding tool and the fixed side holding tool at both ends. The intermediate shaft to which the holder for holding the end portion of the specimen is fixed and is coaxially opposed is rotatably supported, and the holder at both ends of the intermediate shaft, the torque load portion, and the counterclockwise are driven by the torque actuator. A multiple torsional fatigue tester configured to transmit torsional torque to each of two specimens held in series between the holding members of the force unit.

Images