CN104614235A - Tension and compression integrated clamp for mechanical creep testing machine - Google Patents

Abstract

The invention discloses a tension-compression integrated fixture for a mechanical creep testing machine, which comprises an upper tension chuck, an adjustment ball head, a lower compression chuck, an upper compression chuck and a lower tension chuck; an upper tension chuck The head and the lower tensile chuck are dumbbell-shaped specimen tensile chucks. The two sides of the tensile chuck are slotted, and the upper tensile chuck is slotted close to the opening of the tensile chuck. A lower compression chuck is set outward. The boss of the lower stretching collet is provided with a boss carrying the upper compression collet outside the slot near the opening of the stretching collet. On the working surface, the working surface of the lower compression chuck has an inwardly recessed spherical structure, one side of the adjustment ball head matches the spherical structure on the lower compression chuck, and the other side is a plane; the invention can withstand mechanical creep The tensile creep test and compressive creep test are realized on the testing machine.

Description

Tensile-compression integrated fixture for mechanical creep testing machine

technical field

The invention belongs to the technical field of material mechanics research, in particular to a tensile-compression integrated fixture for a mechanical creep testing machine.

Background technique

The creep test is one of the important methods to reflect the viscoelastic mechanics of solid materials. The mechanical creep test device uses the gravity of the weight as the load for the creep test, so as to realize the constant load required by the creep test. Although the technology of mechanical creep test equipment has been developed and mature, its creep loading range is limited by the direction of force, so only tensile creep tests can be performed. In the study of viscoelastic mechanics of solid materials, many materials need to undergo compression creep tests due to their own structural reasons or mechanical performance requirements. The test carried out is the compression creep test, which requires that the compression creep test can be completed on the existing mechanical tensile creep endurance test machine, so an integrated device that can realize tensile creep and compression creep is required. Fixtures.

Contents of the invention

The object of the present invention is to provide a tensile-compression integrated fixture for a mechanical creep testing machine that can realize a tensile creep test and a compressive creep test on a mechanical creep endurance testing machine.

The technical solution that realizes the object of the present invention is:

A tension-compression integrated fixture for a mechanical creep testing machine, including an upper tension chuck, an adjustment ball head, a lower compression chuck, an upper compression chuck, and a lower tension chuck; an upper tension chuck and a pull-down The stretching chuck is a dumbbell-shaped specimen stretching chuck. The two sides of the stretching chuck are slotted. The groove of the upper stretching chuck is close to the opening of the stretching chuck. There is a boss bearing the lower compression chuck outward. The slot of the lower stretching collet is close to the opening of the stretching collet, and there is a boss carrying the upper compression collet. The working surface of the compression chuck has an inwardly concave spherical structure, one side of the adjustment ball head matches the spherical structure on the lower compression chuck, and the other side is a plane.

Compared with the prior art, the present invention has significant advantages:

(1) The present invention can realize the requirement of completing the compression creep on the mechanical tensile creep testing machine, and is convenient to use, economical and practical.

(2) The present invention does not use a complicated structure to meet the test requirements, but cleverly combines the parts of the tension fixture and the compression fixture to meet the test requirements, and has a simple structure.

(3) All the parts in the present invention are all obtained by ordinary machining, and the machining precision is higher, which can ensure the accuracy of the device, and also increase the reliability of the device while processing and manufacturing is convenient and cost-saving.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is an exploded view of the structure of a tension-compression integrated fixture for a mechanical creep testing machine of the present invention.

Fig. 2 is a schematic diagram of placement of a tensile creep test fixture for a mechanical creep testing machine of the present invention using a tension-compression integrated fixture.

Fig. 3 is a schematic diagram of placement of a compression creep test fixture for a tensile-compression integrated fixture for a mechanical creep testing machine of the present invention.

Detailed ways

Combined with Figure 1:

The present invention is a tension-compression integrated fixture for a mechanical creep testing machine, comprising an upper tension chuck 1, an adjustment ball head 2, a lower compression chuck 3, an upper compression chuck 4 and a lower tension chuck 5; The tensile chuck 1 and the lower tensile chuck 5 are dumbbell-shaped specimen tensile chucks, the two sides of the tensile chuck are slotted, and the slot of the upper tensile chuck 1 is set outward near the opening of the tensile chuck There is a boss carrying the lower compression collet 3, and the slot of the lower stretching collet 5 is provided outwardly near the opening of the stretching collet with a boss carrying the upper compression collet 4, the lower compression collet 3 and the upper compression collet 4 The shape of both ends matches the boss, the middle part is the working surface, the working surface of the lower compression chuck 3 has an inwardly recessed spherical structure, and one side of the ball head 2 is adjusted to match the spherical structure on the lower compression chuck 3, The other side is flat.

The lower compression chuck 3 and the upper compression chuck 4 are fixedly connected with the boss by bolts.

The lower stretching collet 5 and the upper compression collet 4 cooperate with the boss using a cylindrical surface.

working principle:

Combined with Figure 2:

When carrying out the tensile creep test, the upper tensile chuck 1 and the lower tensile chuck 5 are placed in parallel in the vertical plane and installed on the mechanical creep endurance test machine, then the standard dumbbell-shaped specimen is clamped Tensile creep tests can be performed on two tensile chucks.

Combined with Figure 3:

When carrying out the compression creep test, the upper tensile chuck 1 and the lower tensile chuck 5 are placed vertically in the vertical plane, the lower compression chuck 3 is installed on the upper tensile chuck 1 through bolts, and the ball head 2 is adjusted Put it on the lower compression chuck 3, move and adjust the ball head 2 to make its working surface fully horizontal so as to be perpendicular to the line of action of gravity. The upper compression collet 4 is installed on the lower tensile collet 5, and the upper compression collet 4 is moved along the contact arc surface of the two parts, so that its working surface is completely parallel to that of the lower compression collet 3, between the two working surfaces The compression creep test can be carried out by putting a cylinder or cuboid compression specimen.

Claims (3)

1. a mechanical type creep testing machine pulling and pressing integratedization fixture, is characterized in that: comprise tensioning chuck (1), adjustment bulb (2), lower compressed chuck (3), upper compressed chuck (4) and lower tensioning chuck (5), upper tensioning chuck (1) and lower tensioning chuck (5) are dumbbell shaped test specimen tensioning chuck, the both sides fluting of tensioning chuck, the close tensioning chuck opening part of upper tensioning chuck (1) fluting is to the boss being outside equipped with the lower compressed chuck (3) of carrying, the close tensioning chuck opening part of lower tensioning chuck (5) fluting is to the boss being outside equipped with the upper compressed chuck (4) of carrying, lower compressed chuck (3) and upper compressed chuck (4) two ends shape coordinate with boss, middle part is workplace, the workplace of lower compressed chuck (3) there is the spherical structure caved inward, the one side of adjustment bulb (2) matches with the spherical structure on lower compressed chuck (3), another side is plane.

2. mechanical type creep testing machine pulling and pressing integratedization fixture according to claim 1, is characterized in that: described lower compressed chuck (3) and upper compressed chuck (4) are connected by bolt with boss.

3. mechanical type creep testing machine pulling and pressing integratedization fixture according to claim 1 and 2, is characterized in that: described lower tensioning chuck (5) and upper compressed chuck (4) adopt cylinder to coordinate with boss.