JP2001027593A - Multiple torsional fatigue tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple torsional fatigue tester enabling the torsional test of a plurality of test pieces by one test to enhance the efficiency of a torsional fatigue test and capable of achieving the reduction of an arranging space and cost reduction as compared with a conventional case arranging a plurality of torsional fatigue testers. SOLUTION: An intermediate bearing 4 is provided between a torque loading part 2 equipped with a torque actuator 21 and a test piece holder 3a and a reaction part 5 having a fixed test piece holder 3d in coaxial relation to both parts 215 and test piece holders 3b, 3c are supported on both sides of the intermediate bearing 4 in a freely revolvable manner and, by driving the torque actuator 21 in such a state that test pieces W are mounted between the torque loading part 2 and the intermediate bearing 4 and between the intermediate bearing 4 and the reaction part 5, a plurality of the test pieces W are loaded with the same torque and can be subjected to a torsional fatigue test by one test.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsional fatigue tester for performing a torsional durability test of various parts and materials.
More specifically, the present invention relates to a multiple torsional fatigue tester capable of performing a torsional fatigue test of a plurality of specimens by one test.

[0002]

2. Description of the Related Art As a testing machine for examining the torsional durability of various parts and materials, conventionally, a rotatable holder and a torque actuator for applying a torsional torque to the holder are provided on a load frame. A torque load portion having a reaction force portion having a retainer provided non-rotatably on a load frame in opposition to the retainer of the torque load portion, and both ends of the specimen are respectively a torque load portion and 2. Description of the Related Art A torsional fatigue tester is known in which a torque actuator is driven while being attached to a holding member of a reaction force portion to repeatedly apply a torsional torque to a specimen.

[0003] In this type of testing machine, generally, the torque acting on the specimen is detected by a torque detector, and the torque actuator is feedback-controlled based on the detected value so that the accurate repeated torque acts on the specimen. The number of cycles until the specimen breaks, and the change in rigidity before and after the application of a predetermined cycle of torsional torque, etc. are investigated.

[0004]

In the conventional torsional fatigue tester as described above, one test piece is mounted between the holders of the torque load portion and the reaction force portion to perform the test. When only one specimen can be tested by the above test, and a large number of sample data need to be collected under the same conditions, there is a problem that much time and labor are required. Here, to solve such a problem, it is conceivable to shorten the test time by increasing the repetition frequency of the torsional torque, but in this case, adverse effects due to the test speed and frequency, such as heat generation and resonance, are considered. It can occur and there is a limit depending on the type of specimen. Further, in a torsion fatigue tester of the type in which the control of the torque actuator is controlled by an electro-hydraulic servo mechanism, an energy loss depending on the frequency response characteristic of the control system occurs.

The present invention has been made in view of such circumstances, and a single test enables torsion fatigue tests of a plurality of specimens, thereby improving the efficiency of the torsional fatigue test. It is an object of the present invention to provide a multiple torsional fatigue tester capable of reducing the installation space and cost as compared with a case where a plurality of conventional torsional fatigue testers are installed.

[0006]

In order to achieve the above object, a torsional fatigue tester according to the present invention is provided on a rotating frame which is rotatably supported on a load frame and holds one end of a specimen. And a torque load unit having a torque actuator for applying a torsional torque to the turning-side holding tool, and a fixed-side holding tool non-rotatably provided on a load frame facing the turning-side holding tool. A torsional fatigue tester equipped with a torque detector for detecting a torque acting on a specimen whose both ends are held between the two holders. At least one intermediate bearing is provided on the load frame coaxially with the two holders, and both sides of the intermediate bearing are provided opposite to the rotating-side holder and the fixed-side holder, respectively. Hold the end of the specimen The holder is rotatably supported, and the torque actuator is driven to twist each of the plurality of specimens held in series between the holder on both sides of the intermediate bearing and the respective holders of the torque load portion and the reaction force portion. It is characterized by being configured to transmit torque (claim 1).

Further, in the present invention, the torque load portion and at least one intermediate bearing are linearly arranged on the load frame, and the reaction force portion is arranged on another straight line parallel to the torque load portion and the intermediate bearing. At least one intermediate bearing is disposed, the torque load portion and the reaction force portion are disposed on the same end side on each straight line, and the intermediate bearings disposed on the other end side on each straight line are connected by a torque transmission mechanism. The configuration (claim 2) can be adopted.

According to the present invention, a plurality of specimens are supported in series between a torque load section and a reaction force section, and torque generated in the torque load section is received by the reaction force section through the plurality of specimens. It is intended to achieve the intended purpose by applying the same torsional torque repeatedly to a plurality of specimens.

That is, for example, when one intermediate bearing portion is provided between the torque load portion and the reaction force portion, one intermediate bearing portion is provided between the rotation-side holder of the torque load portion and the intermediate bearing holder opposed thereto. When the torque actuator is driven while holding both ends of the test piece and holding both ends of another test piece between the holding tool on the opposite side of the intermediate bearing and the holding tool on the reaction force side, The torsional torque generated from the torque actuator is transmitted to the reaction force portion via the holding member of the torque load section, the test piece, the holding tools on both sides of the intermediate bearing, and another test piece. At this time, since the torque from the torque load section to the reaction force section becomes the same, the same load can be applied to each specimen. In addition, 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 unit are required.

In the invention according to claim 2, the intermediate bearings are not arranged in a straight line between the torque load portion and the reaction force portion but are arranged on different straight lines parallel to each other, and each straight line has the same side. By adopting a configuration in which the intermediate bearings provided at the ends of the shaft are connected by a torque transmission mechanism such as a gear mechanism, a belt transmission mechanism, or a link mechanism, the torque generated by the actuator of the torque load unit is transmitted by the torque transmission mechanism. By turning it back and transmitting it to the reaction force part, and interposing a plurality of specimens between them, when a large number of intermediate bearings are provided between the torque load part and the reaction force part, the device configuration becomes longer and This prevents troubles, and also allows the setting work to attach both ends of the specimen to the holder in parallel.

[0011]

Embodiments of the present invention will be described below 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 mechanical components thereof.

A hydraulically driven torque actuator 21 is mounted on the load frame 1, and a specimen holder 3a is fixed to an output shaft 22 of the torque actuator 21. Make up. On the load frame 1, there are also intermediate bearings 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 table 51 fixed to the load frame 1 and a specimen holder 3d fixed to the support table 51.
A torque detector 6 is interposed between the specimen holder 3d and the specimen holder 3d.

The intermediate shaft 41 is arranged coaxially with the output shaft 21 of the torque actuator 2. Therefore, the specimen holder 3 b fixed to the end of the intermediate shaft 41 on the side of the torque load section 2 is
The specimen holder 3a of the torque load unit 2 is coaxially opposed to each other. The specimen holder 3d of the reaction part 5 is disposed coaxially opposite to the specimen holder 3c of the intermediate shaft 41 on the reaction part 5 side.

The specimen holders 3a to 3d are for holding both ends of the specimen W, respectively.
a and 3b and holders 3c and 3d have a structure capable of holding one end and the other end of the specimen W in a pair.

The torque actuator 21 operates when pressure oil supplied from a hydraulic unit 71 is supplied via a servo valve 72, and the servo valve 72 operates according to a control signal supplied from a control device 73 to open the valve. Is controlled momentarily. The control device 73 includes the torque detector 6
, And the valve opening of the servo valve 72 is controlled so that the momentarily detected output coincides with a preset repetitive torque target value signal.

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, the servo valve 7 is controlled by a command from the controller 73.
2, the torque generated by the torque actuator 21 is applied to the specimen holder 3a, one specimen W, the specimen holder 3b, and the intermediate shaft 4.
1. 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 part 5. Therefore, the same torque acts on the two specimens W, and the same torsional fatigue test can be performed on the two specimens W by one test. 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,
An accurate test equivalent to a conventional torsional fatigue tester can be performed.

In the above-described embodiment, an example is shown in which one intermediate bearing 4 is provided between the torque load portion 2 and the reaction force portion 5, but a plurality of intermediate bearings 4 equivalent to this may be provided. The number of test specimens that can be processed in one test can be increased as the number of intermediate bearings 4 is increased. However, when the number of the intermediate bearings 4 is increased, the configuration of the device becomes longer in one direction, and there is a possibility that the installation of the test machine becomes difficult in relation to the installation space. Such a problem can be solved by adopting another embodiment of the present invention described below.

FIG. 3 is a plan view of mechanical components showing the configuration of the embodiment of the present invention. In this embodiment, a torque load section 2 similar to the above is provided on a load frame 1.
And a reaction force portion 5 and four intermediate bearings 4a to 4d similar to the above-described intermediate bearing 4 are provided. Of these, two intermediate bearings 4a and 4b Other two intermediate bearings 4c on the same straight line A as
And 4d are arranged on another straight line B parallel to the straight line A together with the reaction force portion 5, and the torque load portion 2 and the reaction force portion 5 are arranged on the same end side of the load frame 1. Note that the hydraulic circuit of the torque actuator 21 and the control device 73 are the same as those in the previous embodiment, and their illustration and description are omitted.

The intermediate shaft 4 of the intermediate bearings 4a and 4d
Specimen holders 3b, 3c and 3f, 3g are fixed to both ends of 1a and 41d, respectively. The intermediate shafts 41b and 41c of the intermediate bearings 4b and 4c have
The specimen holder 3d or 3e is fixed to only one end of the torque load section 2 or the reaction force section 5, respectively. And the intermediate shafts 41b and 41 of the intermediate bearings 4b and 4c
c are connected to each other by a torque transmission mechanism 8 such as a gear mechanism, a belt transmission mechanism, or a link mechanism. In this embodiment, two torque detectors 6a and 6b are used, and one torque detector 6a is provided between the intermediate shaft 41b of the intermediate bearing 4b and the specimen holder 3d, and the other torque detector 6a. 6b is provided between the support 51 of the reaction part 5 and the specimen holder 3h. These two torque detectors 6a and 6b are used as a test for controlling any one of the outputs of the torque actuators 21, and the outputs of the two torque detectors 6a and 6b are used as monitors.

When the above embodiment is used, between the specimen holder 3a of the torque load unit 2 and one specimen holder 3b of the intermediate bearing 4a, between the specimen holder 3b of the intermediate bearing 4a and the other specimen holder 3c of the intermediate bearing 4a. The specimen holder 3d of the intermediate bearing 4b, the specimen holder 3e of the intermediate bearing 4c and one specimen holder 3f of the intermediate bearing 4d, and the other specimen holder 3g of the intermediate bearing 4d and the reaction piece 5 Specimen W is placed between specimen holders 3h.
The drive of the torque actuator 21 is controlled in a state where is attached. As a result, the torque generated by the torque actuator 21 is equal to that of each specimen W as in the previous embodiment.
And transmitted to the reaction force portion 5 via the intermediate shafts 41a to 41d and received.
The torque is returned and transmitted by the torque transmission mechanism 8 between b and the intermediate shaft 41c. Then, as in the previous embodiment, the same torque acts on each member between each torque load portion 2 and the reaction force portion 5, so that four tests are performed in one test.
The same torsional fatigue test can be performed on the specimens W. Further, the weight of the other specimen W does not act on each specimen W as a bending load due to each of the intermediate bearings 4a to 4d, and the torque transmission mechanism 8 causes the intermediate shafts 41b to 4d to rotate.
The bending force generated when transmitting torque to 1c is also received, and does not act on the specimen W.

In each of the above embodiments, when it is necessary to individually detect the torque acting on each specimen W, a torque detector is provided on each intermediate shaft in addition to the reaction force section 5. Just do it.

[0022]

As described above, according to the present invention, an intermediate bearing is provided between a torque load portion and a reaction force portion, and a holder for holding ends of a specimen on both sides of the intermediate bearing. Is rotatably supported, and the torque generated by driving the torque actuator with both ends of the specimen mounted between the torque load section, the intermediate bearing, and the reaction force section is applied to each of the plurality of specimens. Since it is configured to be transmitted equally, a torsion fatigue test can be performed on a plurality of specimens under the same condition by one test. As a result, the number of setting test conditions can be reduced, and
When testing a test piece having a limited test frequency, the test time can be shortened even if the power consumption of the tester is the same.

According to the present invention, the torque actuator and the reaction force portion can be made common as compared with the case where a plurality of conventional torsional fatigue testing machines are installed, so that the installation space is small. This is advantageous in terms of cost and cost. In addition, it is possible to reduce the energy loss depending on the test frequency and the test speed as compared with the case where the test frequency and the test speed of the conventional torsional fatigue tester are increased, thereby improving the energy efficiency of the test. it can.

On the other hand, by adopting the invention according to claim 2,
Even if a large number of intermediate bearings are provided in order to perform a torsional fatigue test of a large number of specimens in one test, it is possible to eliminate the difficulty of installation due to the length of the test machine in one direction, It is not necessary to set test specimens one by one as in the case of arranging a large number of intermediate bearings in parallel, and it is possible to set test specimens by parallel work, reducing the time required for specimen setting. It becomes possible.

[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.

FIG. 3 is a plan view of a mechanical component of another embodiment of the present invention.

[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 part 6,6a, 6b Torque detector 71 Hydraulic unit 72 Servo valve 73 Controller 8 Torque transmission mechanism W Specimen

Claims (2)

[Claims] 1. A torque load, comprising: a rotation-side holder rotatably supported on a load frame for holding one end of a specimen; and a torque actuator for applying a torsional torque to the rotation-side holder. And a reaction force portion having a fixed-side holding member non-rotatably provided on the load frame in opposition to the rotating-side holding member, and acting on a specimen having both ends held between the two holding members. In a torsional fatigue tester equipped with a torque detector that detects the torque to be applied, on a load frame between the torque load unit and the reaction force unit,
At least one intermediate bearing is provided coaxially with the two holders, and on both sides of the intermediate bearing, the ends of the specimen are respectively opposed to the rotating-side holder and the fixed-side holder. Each of a plurality of specimens held in series between the holders on both sides of the intermediate bearing and the respective holders of the torque load portion and the reaction force portion by driving of the torque actuator is supported by the holder for holding. A multiple torsional fatigue tester characterized in that a torsional torque is transmitted to the torsion fatigue tester. 2. The torque load portion and at least one intermediate bearing are linearly arranged on the load frame, and the reaction force portion and at least one intermediate bearing on another straight line parallel to the torque load portion and the at least one intermediate bearing. Are arranged, the torque load portion and the reaction force portion are arranged on the same end side on each straight line, and the intermediate bearings arranged on the other end side on each straight line are connected by a torque transmission mechanism. The multiple torsional fatigue tester according to claim 1, wherein: