Tensile machine clamp for tensile test of high-strength steel

Abstract

The utility model relates to a tensile machine clamp for a tensile test of high-strength steel and belongs to the technical field of tensile tests in metallurgical industry. According to the technical scheme, the device comprises an adapter (1) and an adapter rod (5), the adapter (1) and the adapter rod (5) are both in a stepped cylinder shape, the small-diameter end of the adapter (1) is in threaded connection with the large-diameter end of the adapter rod (5), the large-diameter end of the adapter (1) is provided with a sample connecting screw hole (2) matched with a sample, and the sample connecting screw hole (2) is in threaded connection with the adapter (1). A tensile machine connecting rod (8) matched with a tensile test tensile machine is arranged at one end, with a smaller diameter, of the switching rod (5); transition arcs are arranged at steps of the stepped cylindrical adapter (1) and the adapter rod (5); and an adapter and an adapter rod connecting screw hole (6) are arranged at one end of the adapter rod (5) with a larger diameter. The utility model has the beneficial effects that the stress is balanced in the stretching process, the problems of buckle sliding and breakage at the joint are avoided, and the research requirement of the high-strength steel stretching test is met.

Description

Technical Field

[0001] This utility model relates to a clamp for a high-strength steel tensile testing machine, belonging to the field of tensile testing technology in the metallurgical industry. Background Technology

[0002] Tensile testing is a routine and important method for testing the mechanical properties of materials. Conventional fixtures are prone to slippage and breakage during the tensile process due to uneven force distribution. With the increasing research focus on the tensile properties of high-strength steels such as gear steel, protective steel, and weathering steel, there is an urgent need for a high-strength steel tensile testing machine fixture to meet the research needs of high-strength steel tensile testing. Utility Model Content

[0003] The purpose of this invention is to provide a clamp for a high-strength steel tensile testing machine that ensures balanced force distribution during the tensile process, avoids slippage and breakage at the connection points, meets the research needs of high-strength steel tensile testing, and solves the problems existing in the background technology.

[0004] The technical solution of this utility model is:

[0005] A high-strength steel tensile testing machine fixture includes an adapter and an adapter rod, both of which are stepped cylindrical. The smaller diameter end of the adapter and the larger diameter end of the adapter rod are threaded together. The larger diameter end of the adapter is provided with a sample connection screw hole that mates with the sample. The smaller diameter end of the adapter rod is a tensile testing machine connecting rod that mates with the tensile testing machine.

[0006] The stepped cylindrical adapter and the step of the adapter rod are both provided with transition arcs.

[0007] The larger diameter end of the adapter rod is provided with an adapter connector and an adapter rod connecting screw hole.

[0008] The centerline of the sample connecting screw hole, as well as the centerline of the connecting screw hole of the adapter and adapter rod, coincide with the centerline of the adapter and adapter rod.

[0009] The beneficial effects of this utility model are: the adapter and adapter rod in the fixture are connected by transition arcs, which makes the force even during the tensile process; in addition, the material composition design and special heat treatment process increase the strength of the fixture and avoid slippage and breakage at the connection, which can meet the research needs of high-strength steel tensile test. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the adapter;

[0012] Figure 3 Intended for use as an adapter rod;

[0013] In the diagram: 1. Adapter connecting screw hole; 2. Adapter transition arc; 3. Adapter and adapter rod connecting thread; 4. Adapter rod; 5. Adapter and adapter rod connecting screw hole; 6. Adapter rod transition arc; 7. Tensile testing machine connecting rod; 8. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] See attached document Figure 1-3 A high-strength steel tensile testing machine fixture includes an adapter 1 and an adapter rod 5. Both the adapter 1 and the adapter rod 5 are stepped cylindrical. The smaller diameter end of the adapter 1 and the larger diameter end of the adapter rod 5 are threaded together. The larger diameter end of the adapter 1 is provided with a sample connection screw hole 2 that mates with the sample. The smaller diameter end of the adapter rod 5 is a tensile testing machine connecting rod 8 that mates with the tensile testing machine.

[0016] In this embodiment, refer to the appendix Figure 1-3 A high-strength steel tensile testing machine fixture comprises two parts: an adapter 1 and an adapter rod 5. The adapter 1 is an integral structure consisting of a sample connecting screw hole 2, an adapter transition arc 3, and a connecting thread 4. The adapter rod 5 is an integral structure consisting of a connecting screw hole 6, an adapter rod transition arc 7, and a connecting rod 8.

[0017] See attached document Figure 1-3 The adapter 1 and adapter rod 5 are made of 40CrNiMoA high-strength steel, in which the alloying elements such as carbon, chromium, nickel and molybdenum are incorporated, which significantly improves the hardness, strength and toughness. In addition, after heating at 860℃ for 1 hour, the material is quenched in oil or water, then tempered at 410℃ for 90 minutes, and finally air-cooled to further improve the tensile strength and elongation of the material to meet the tensile test requirements of high-strength steel.

[0018] The transition arc 3 at the adapter has a diameter of 10mm, and the transition arc 7 at the adapter rod has a diameter of 12.5mm. The design of the two transition arcs can make the force evenly distributed during the tensile test, reduce the slippage and breakage problems at the connection between the adapter and the adapter rod and at the connection between the adapter and the tensile sample, and indirectly improve the tensile strength of the fixture.

[0019] The adapter connection thread 2 has a nominal diameter of 12mm and 14mm respectively, which can be selected and replaced according to the size of the tensile test specimen. The screw hole 6 at the connection between the adapter and the adapter rod has a depth of 40mm, which can ensure that the connection length is sufficient and facilitates disassembly and assembly.

[0020] During tensile testing, the fixture is used in pairs, and different sizes of adapter 1 are selected according to the processing dimensions of the tensile specimen. The specimen is connected to the adapter thread 2. The adapter 1 and the adapter rod 5 are connected by thread 4 and screw hole 6. The connecting rod 8 is clamped on the clamping port of the tensile testing machine.

Claims

1. A high strength steel tensile testing pull machine fixture, characterized by: The adapter (1) and the adapter rod (5) are both stepped cylinders, the smaller diameter end of the adapter (1) and the larger diameter end of the adapter rod (5) are screwed together, the larger diameter end of the adapter (1) is provided with a sample connection screw hole (2) matched with the sample, and the smaller diameter end of the adapter rod (5) is a tension machine connection rod (8) matched with the tensile testing machine.

2. A high-strength steel tensile testing machine clamp according to claim 1, characterized in that: The stepped cylinders of the adapter (1) and the adapter rod (5) are both provided with an excess circular arc at the step.

3. A high strength steel tensile testing machine clamp as defined in claim 1, wherein: The larger diameter end of the adapter rod (5) is provided with an adapter and adapter rod connection screw hole (6).

4. A high strength steel tensile testing machine clamp as defined in claim 1, wherein: The center lines of the sample connection screw hole (2) and the adapter and adapter rod connection screw hole (6) are coincided with the center line of the adapter (1) and the adapter rod (5).

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