CN110567800A - a stretching fixture - Google Patents

Abstract

The invention provides a stretching fixture. A stretching fixture, which includes a pressing plate and a base, the pressing plate is detachably connected to the base, a fixing groove is provided on the side of the base opposite to the pressing plate, and the fixing groove is connected to the pressing plate Corresponding positions are provided with positioning holes. The invention can fix the right-angle or T-shaped sample on the fixture, and carry out the tensile test on the universal testing machine.

Description

a stretching fixture

technical field

The present invention relates to the technical field of tensile testing, more specifically, to a tensile fixture.

Background technique

It is difficult to conduct bending failure experiments to test the mechanical properties of welds for metal samples with good toughness, and can only be tested by tensile fracture methods, such as stainless steel. At present, the method for the tensile properties of metal mechanics is mainly to combine the vertical clamping of the universal testing machine to stretch the flat sample coaxially. This method is only applicable to the force of the sample on the same axis. Right-angle or T-shaped samples cannot be tested by force on the same axis, and when the universal testing machine itself does not have a suitable fixture for this type of fixture, a special fixture is required to meet this requirement. China Publication Patent No. CN208476664U, the publication date is February 5, 2019. The application discloses a tensile fixture for magnesium alloy rods, including an upper fixture and a lower fixture; the upper and lower fixtures are connected to the tension test On the machine; the upper and lower clamps are used to clamp the magnesium alloy rod specimens with steps. This patent application adapts to different sizes of magnesium alloy rods by replacing the lower hanging body and support ring, which is flexible in use and saves costs. However, this patent application is not applicable to samples whose structure is right-angled or T-shaped, and tensile tests cannot be performed on samples of this unique shape.

Contents of the invention

The object of the present invention is to overcome the shortcoming that the existing tensile fixture cannot perform tensile tests on a universal testing machine for right-angle or T-shaped sample structures, and to provide a tensile fixture. The invention can fix the right-angle or T-shaped sample on the fixture, and carry out the tensile test on the universal testing machine.

In order to solve the above technical problems, the technical solution adopted by the present invention is: comprising a pressing plate and a base, the pressing plate is detachably connected to the base, a fixing groove is provided on the side of the base opposite to the pressing plate, and the pressing plate A positioning hole is provided at a position corresponding to the fixing groove. When stretching a right-angled sample, pass one end of the right-angled sample through the positioning hole of the pressure plate, place the other end of the right-angled sample in the fixing groove of the base, and then connect the pressure plate and the base, and the entire sample is fixed on the in the fixture.

Further, the base includes a clamping part and a loading part, the clamping part and the loading part are perpendicular to each other, and the fixing groove is located in the loading part of the base. During the tensile test, the loading part of the base is used to place the sample, and the lower chuck of the universal testing machine fixes and clamps the clamping part of the base.

Further, one end of the fixing groove extends to the edge of the loading part of the base, and the other end of the fixing groove is on the same plane as the centerline of the positioning hole. One end of the fixing groove extends out of the edge of the loading part of the base, so that the overlong right-angle side of the right-angled sample placed in the groove protrudes from the edge of the loading part of the base. The other end of the fixing groove is on the same plane as the center line of the positioning hole, which can ensure that the right-angle or T-shaped sample is fixed and clamped in the tensile fixture.

Further, the centerline of the positioning hole is on the same axis as the centerline of the clamping part of the base. The clamping part of the base has a thickness of 25mm-30mm. The lower chuck of the universal testing machine clamps the clamping part of the base, so the thickness range of the clamping part of the base must meet the clamping range of the lower chuck of the universal testing machine, and the clamping range of the lower chuck of the universal testing machine is 25mm -30mm, so the thickness of the clamping part of the base is 25mm-30mm. The center line of the positioning hole and the center line of the clamping part of the base are on the same axis, so that the clamped sample structure can receive the maximum tensile force of the universal testing machine in the force direction of the tensile fixture.

Further, the four corners of the loading part of the base and the pressure plate are respectively provided with bolts, and the pressure plate and the base are detachably connected by the bolts. The four corners of the tensile fixture are fixed with bolts, so that the overall fixture is stable during the tensile test. The bolt connection makes the pressure plate and the base detachable, which is convenient for the installation of the sample structure. It can also be adjusted according to the size of different sample structures. Replace the pressure plate with a different size of the positioning hole or the base with a different size of the fixing groove.

Compared with prior art, the beneficial effect of the present invention is:

In the present invention, a positioning hole is provided on the pressing plate and a fixing groove matched with the positioning hole is provided on the base, so that the right-angle or T-shaped sample can be fixed on the fixture, and the tensile test is carried out on the universal testing machine; The pressure plate and the base are detachably connected. When facing samples of different sizes, the pressure plates with different sizes of positioning holes and the bases with different sizes of fixing grooves can be used in conjunction with each other.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Icon marks are explained as follows:

1-bolt, 2-spring washer, 3-pressure plate, 4-loading part of the base, 5-nut, 6-positioning hole, 7-fixing groove, 8-clamping part of the base.

Detailed ways

The present invention will be further described below in combination with specific embodiments. Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.

In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific Orientation structure and operation, therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes, and should not be construed as limitations on this patent. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

As shown in Fig. 1, it is the first embodiment of the present invention, a kind of stretching fixture, comprises pressing plate 3 and base, described pressing plate 3 and base are detachably connected by bolt 1, on the side opposite to pressing plate 3 on the base, be provided with The fixing groove 7 is provided with a positioning hole 6 at a position corresponding to the fixing groove 7 on the pressing plate.

Wherein, the base includes a clamping portion 8 and a loading portion 4, the upper surface of the base is located at the loading portion 4 of the base, one end of the fixing groove 7 extends to the edge of the loading portion 4 of the base, and the other end of the fixing groove 7 is in the center of the positioning hole 6. lines are on the same level. The base holding portion 8 has a thickness of 27 mm.

In addition, the four corners of the base loading part 4 and the pressure plate 3 are connected by bolts 1. In this embodiment, the bolts 1, spring washers 2, and nuts 5 are sequentially connected to fix the pressure plate 3 and the base.

The working principle of this embodiment is as follows: one of the right-angled sides of the right-angled sample is passed through the positioning hole 6 of the pressing plate 3, and the other right-angled side of the right-angled sample is placed in the fixing groove 7 of the loading part 4 of the base, and the right-angled The overlong part of the side directly stretches out from the edge opening of the base loading part 4 from the fixed groove 7, and the pressing plate 3 and the base of the right-angle sample are installed with the bolt 1, the spring washer 2 and the nut 5 are fixed and compressed. The lower chuck of the universal testing machine clamps the middle of the clamping part 8 of the base, and the upper chuck of the universal testing machine clamps the right-angled sample to pass through the right-angled side of the positioning hole 6 of the pressure plate 3, because the center line of the clamping part 8 of the base It is on the same axis as the centerline of the positioning hole 6, so the right-angled sample passes through the right-angled side of the positioning hole 6 of the pressure plate 3 and is on the same axis as the centerline of the lower chuck of the universal testing machine, and the right-angled sample can be placed in the center of the universal testing machine. Tensile tests were performed in the tensile direction.

The second embodiment of the present invention is similar to the first embodiment of the present invention, the difference is that in this embodiment, the thickness of the vertical part 8 of the base is 29mm, and the present invention is used for stretching the T-shaped sample. The vertical side of the T-shaped sample passes through the positioning hole 6 of the pressure plate 3, the horizontal side of the T-shaped sample is placed on the base loading part 4, and the fixing groove 7 on the base does not fix the horizontal side of the T-shaped sample. effect. In this embodiment, the bolt 1, the spring washer 2, and the nut 5 are sequentially connected to clamp the pressing plate 3, the base and the T-shaped sample fixed between them. The lower chuck of the universal testing machine clamps the middle of the clamping part 8 of the base of the embodiment, and the upper chuck of the universal testing machine clamps the vertical edge of the T-shaped sample passing through the positioning hole 6 of the pressing plate 3, and starts the universal testing machine , Tensile experiments were carried out on the T-shaped specimens.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (6)

1. The utility model provides a tensile anchor clamps, includes clamp plate and base, the clamp plate with the base can be dismantled and be connected its characterized in that: the base is provided with a fixing groove on the side face opposite to the pressing plate, and the pressing plate is provided with a positioning hole at the position corresponding to the fixing groove.

2. A stretch clip as claimed in claim 1, wherein: the base comprises a clamping part and a loading part, the clamping part and the loading part are perpendicular to each other, and the fixing groove is located in the loading part of the base.

3. A stretch clip as claimed in claim 2, wherein: one end of the fixing groove extends to the edge of the base loading part, and the other end of the fixing groove and the center line of the positioning hole are located on the same plane.

4. A stretch clip as claimed in claim 3, wherein: the center line of the positioning hole and the center line of the base clamping part are on the same axis.

5. A stretch clip as claimed in claim 2, wherein: the thickness of the base clamping part is 25mm-30 mm.

6. A stretch clip as claimed in claim 2, wherein: bolts are respectively arranged at four corners of the base loading part and the pressing plate, and the pressing plate and the base are detachably connected through the bolts.