JPS6228638A - Compound stress tester - Google Patents

Abstract

PURPOSE:To correctly move the actuator in peripheral direction in the axial direction and to increase the accuracy in the inspection data by constituting a static pressure bearing between the sliding plate of the actuator in peripheral direction and the guide groove of a supporting body. CONSTITUTION:A test piece 6 is pinched by the chuck 3 of the upper part of a machine frame 1 and the chuck 4 at the upper end of a motive power transmission rod 5. A piston 7 is fixed to the rod 5, constituting the actuator in the axial direction together with a hydraulic cylinder 8. The rotary actuator 9 as for the actuator in peripheral direction is provided at the lower end of the rod 5 as well and a sliding plate 10 is provided on the outer peripheral part thereof. The sliding plate 10 is made freely movable vertically in the guide groove 12 of a supporting body 11. An oil blowout aperture (not shown in the figure) is provided as well as the guide plate 12 side of the sliding plate 10 and the oil pressure is fed from a hydraulic pipe 14 at its using time to consti tute a static pressure bearing. The sliding plate 10 can thus be movable verti cally smoothly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a composite stress test Da that can test materials under composite stress by simultaneously applying a tensile compression load and a torsional load to a test piece. It is.

[Conventional technology]

A compound stress tester requires an axial actuator and a circumferential actuator for chucking the specimen.

In the past, these actuators were installed facing each other on both sides of a pair of chucks, but in recent years, one of the chucks has been installed on the machine frame and the other chuck has been installed on the power transmission rod. An apparatus has been developed in which the overall structure of the apparatus is simplified by applying both the above-mentioned actuators in the axial direction and the circumferential direction to the apparatus.

By the way, in this actuator concentration method, since it is necessary to transmit power in the axial direction and the circumferential direction to one power transmission rod, the actuator in the circumferential direction follows the movement of the power transmission rod in the axial direction. The tester must be able to move accurately in the axial direction without reducing the accuracy of the test.

FIG. 4 shows a support mechanism that allows the movement of the actuator, in which a is a power transmission rod with a chuck (not shown) on the moving side at its tip, and b is a power transmission rod that moves the rod a in the circumferential direction. It is a rotary actuator that drives it. Although not shown, a hydraulic cylinder serving as an axial actuator is combined with the power transmission rod a.

Sliding plates c, c are protruded from opposing positions on the outer periphery of the rotary actuator b, and the sliding plates c, c are formed in guide grooves e, e formed in a pair of supports d, d in the test device.
The movement is guided while being held between roller bearings f and f.

By the way, with this structure, due to the limit of mechanical precision, it is unavoidable to have looseness in the direction of rotation, which reduces the test accuracy and also reduces the lifespan of the roller bearing because the sliding plate C applies an impact to one surface of the roller bearing during use. It has shortcomings such as being short.

[Problem that the invention seeks to solve]

The present invention has been made with attention to the above points, and by adopting a hydrostatic bearing instead of the roller bearing described above, it is possible to achieve smooth movement without generating vibration in the sliding guide portion of the actuator in the circumferential direction. This allows for movement.

[Means for solving problems]

In order to achieve the above object, in the present invention, one chuck for supporting the specimen is provided on the machine frame, and the other chuck is provided on the motion transmission rod to face it, and the motion transmission rod has an axial direction. In a test machine in which an actuator and a circumferential actuator are directly connected, a sliding plate of the circumferential actuator is provided to be movable in the axial direction in a guide groove of a support, and each side of the guide groove is attached to the sliding plate. A hydrostatic bearing is constructed between the sliding plate and the support by providing an oil blowout hole for the sliding plate.

〔Example〕

FIG. 1 shows the entire complex stress testing machine, in which an integrated mounting section 2 for torsion and tension sensors, etc. is provided at the top of a machine frame 1, and a chuck 3 on the non-drive side is provided at the bottom thereof. Reference numeral 4 denotes a drive-side chuck, which is provided at the upper end of the power transmission rod 5 facing in the vertical direction. A pair of chucks 3 and 4 clamp a test piece 6.

A piston 7 is fixed to the power transmission rod 5, and the piston 7 is connected to a hydraulic cylinder 8 as an axial actuator.
The shaft is driven in the axial direction by receiving a driving force within the shaft. A rotary actuator 9 is provided at the lower end of the power transmission rod 5 as an actuator for the rod 5 in the circumferential direction.

A pair of sliding plates 10 and 10 are provided at opposing positions on the outer circumference of the rotary actuator 9.
, 10 are guide grooves 12 formed in the pair of supports 11, 11.
．． 12, it is supported so as to be vertically movable. As shown in detail in FIGS. 2 and 3, oil blow-off holes 10a for each side of the guide groove 12 are formed on both sides of the sliding plate 1o, and pads 13 are provided. A hydraulic pipe 14 is connected to the hydraulic pressure introducing hole 10b, and the guide groove 12 is connected to the blowing hole 10a during use.
A hydrostatic bearing is constructed by supplying hydraulic pressure to the gap G between the two surfaces.

During use, the rotary actuator 9 smoothly moves along the guide groove 11 of the support 11 while applying a circumferential driving force to the power transmission loft 5.

〔Effect of the invention〕

As described above, the present invention provides one chuck for supporting the test piece on the machine frame, and the other chuck is provided on the motion transmission rod to face each other, and the motion transmission rod has an axial actuator and a circumferential actuator. In a testing machine in which an actuator is directly connected, a sliding plate of the circumferential actuator is provided to be movable in the axial direction in a guide groove of a support,
Since the sliding plate is provided with oil blow-off holes for each side of the guide groove and a hydrostatic bearing is formed between the sliding plate and the support body, when the power transmission loft operates in the axial direction, The actuator can be moved accurately in the circumferential direction, and highly accurate inspection data can be obtained.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the composite stress testing machine according to the present invention, Figure 2
The figure is a perspective view of the main part, FIG. 3 is a sectional view of the main part, and FIG. 4 is a perspective view of a conventional example. DESCRIPTION OF SYMBOLS 1... Machine frame, 3, 4... Chuck, 5... Power transmission rod, 6... Test piece, 8... Hydraulic cylinder (axial actuator), 9... Rotary actuator ( circumferential actuator), 10... sliding plate, 11... support body, 12... guide groove, 10a...
Oil outlet. Patent applicant: Saginomiya Seisakusho Co., Ltd.
Director: Hideo Takino.

Claims (1)

[Claims] A testing machine in which one chuck for supporting the test piece is provided on the machine frame, and the other chuck is provided on a motion transmission rod to face each other, and an axial actuator and a circumferential actuator are directly connected to the motion transmission rod. A sliding plate of the actuator in the circumferential direction is provided to be movable in the axial direction in a guide groove of the support body, and an oil blowing hole for each surface of the guide groove is provided in the sliding plate, so that the sliding plate is connected to the sliding plate. A compound stress testing machine characterized by comprising a hydrostatic bearing between supports.