CN207964467U - Auxiliary clamp suitable for short and small sample torsion test - Google Patents

Abstract

The utility model relates to an auxiliary fixture suitable for the torsion test of short and small samples, comprising two paired single fixtures, the single fixture includes a handle rod and a tapered sleeve, the front end of the handle rod is provided with a jaw, and the inner surface of the jaw is processed Stripes to ensure sufficient friction so that the sample does not slip in the circumferential and axial directions during torsion. The front end of the shank is provided with an external thread on the rear side of the clamp, and a through hole is provided in the tapered sleeve. The front of the through hole It is a tapered hole with a small front and a large rear. The rear part of the through hole is a cylindrical hole. The diameter of the cylindrical hole is the same as the maximum diameter of the tapered hole. The inner surface of the cylindrical hole is provided with internal threads. It is used to fix the sample. After the sample is placed in the front clamp of the handle rod, the tapered sleeve is tightened. The tapered surface of the inner wall of the tapered sleeve tightens the clamp radially to achieve the purpose of fixing the sample. The utility model solves the problem of It solves the problem of difficult clamping on the torsion machine in the torsion test of small-sized samples. The structure is simple, the operation is convenient, and it can be used repeatedly.

Description

Auxiliary fixture for torsion testing of short and small specimens

technical field

The utility model relates to an auxiliary fixture suitable for torsion tests of short and small samples, which belongs to the field of torsion tests of metal samples.

Background technique

With the continuous development and improvement of disciplines in colleges and universities, the research on materials in various fields is becoming more and more important. Materials of different application occasions, shapes and sizes have gradually aroused the interest of researchers and gradually entered classroom practice teaching. The torsion test can measure the strength and plasticity of materials. It is one of the basic test methods for the mechanical properties of materials and an important test of material mechanics. It has important practical significance in actual engineering machinery. Ordinary torsion testing machines can only reliably clamp standard samples with specific dimensions, but in practical applications, a considerable part of the material or sample size is small, such as common short bar parts, because of their small length, It is impossible to process the size of the torsion sample according to the national standard, so it is impossible to directly clamp the test on the torsion testing machine. In practical engineering applications, the application of short and small shafts, springs and other components is often involved. These parts cannot be tested consistent with the actual working conditions, and there is a certain gap in the estimation of their plasticity and toughness, which leads to safety hazards in the later use process.

Contents of the invention

The utility model provides an auxiliary fixture suitable for torsion tests of short and small samples.

The solution adopted by the utility model to solve the technical problem is that an auxiliary fixture suitable for the torsion test of short and small samples includes two paired single fixtures, the single fixture includes a handle rod and a tapered sleeve, and the front end of the handle rod is opened Clamp, the inner surface of the clamp is processed with stripes, the front end of the handle bar is provided with external threads on the rear side of the clamp, and a through hole is provided in the tapered sleeve. Cylindrical hole, the diameter of the cylindrical hole is the same as the maximum diameter of the taper hole, the inner surface of the cylindrical hole is provided with internal thread, and the tapered sleeve is set on the front end of the handle rod and screwed with the thread.

Further, the size of the front end of the handle is smaller than the size of the rear end of the handle, and the size of the rear end of the handle is consistent with the size of the torsion test standard sample.

Further, the front end of the shank is processed with rounded chamfers.

Further, two strip-shaped openings are arranged symmetrically along the axial direction of the jaw on the outer periphery of the jaw.

Further, the diameter of the jaw is not larger than the maximum diameter of the tapered hole and not smaller than the minimum diameter of the tapered hole.

Further, stripes are provided on the outer periphery of the rear part of the tapered sleeve.

Compared with the prior art, the utility model has the following beneficial effects: it solves the problem of difficult clamping on the torsion machine in the torsion experiment of small-sized samples, and has simple structure, reasonable design, convenient operation, low cost, convenient manufacture, and applicability Wide, not easy to damage, can be reused many times.

Description of drawings

Below in conjunction with accompanying drawing, the utility model patent is further described.

Figure 1 is a schematic diagram of the structure of a single clamp.

Figure 2 is a schematic diagram of the structure of two single clamps to adjust and fix the sample.

In the picture:

1-tapered sleeve; 2-tapered hole; 3-cylindrical hole; 4-jaw; 5-stripes; 6-strip opening; 7-external thread;

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

As shown in Figure 1-2, an auxiliary fixture suitable for the torsion test of short and small samples includes two paired single fixtures. The single fixture includes a handle rod and a tapered sleeve. The inner surface of the mouth is processed with stripes to ensure sufficient friction so that the sample does not slip in the circumferential and axial directions during the torsion process. The front end of the shank is provided with an external thread on the rear side of the jaw, and a through hole is provided in the tapered sleeve. The front part of the through hole is a tapered hole with a small front and a large rear, and the rear part of the through hole is a cylindrical hole. The diameter of the cylindrical hole is the same as the maximum diameter of the tapered hole. The inner surface of the cylindrical hole is provided with internal threads. The screw thread is used to fix the sample. After the sample is placed in the front clamp of the handle rod, the tapered sleeve is tightened. The tapered surface of the inner wall of the tapered sleeve tightens the clamp radially to achieve the purpose of fixing the sample.

In this embodiment, the size of the front end of the handle is smaller than the size of the rear end of the handle, and the size of the rear end of the handle is consistent with the size of the torsion test standard sample, which is convenient for clamping on the torsion machine and ensures axis alignment.

In this embodiment, a striped portion is provided on the outer periphery of the rear part of the tapered sleeve to facilitate the rotation of the tapered sleeve.

In this embodiment, the front end of the shank is processed with a round chamfer, the diameter of the jaw is not larger than the maximum diameter of the taper hole and is not smaller than the minimum diameter of the taper hole, and two strip-shaped openings are symmetrically arranged on the outer circumference of the jaw along the axial direction of the jaw, so that The tapered sleeve is in contact with the tapered surface of the inner wall when it is threaded, and radially shrinks under the pressure of the tapered surface to compress the sample to achieve the purpose of fixing the sample.

In this embodiment, the jaw is a sleeve part, the rear end of the sleeve part is connected to the handle rod, and two strip-shaped openings are symmetrically arranged on the outer circumference of the sleeve part along the axial direction of the jaw, and the two strip-shaped openings connect the sleeve part It is divided into two arc-shaped parts, and a section for accommodating the sample is formed between the two arc-shaped parts. The two strip-shaped openings enable the sleeve to shrink radially under the pressure of the tapered surface of the tapered sleeve.

Before the test, ensure that the shank of each single fixture is matched with the tapered sleeve, and ensure that a certain gap is reserved at the front end of the shank, clamp the first single fixture on the fixed clamp seat of the torsion testing machine, and the second A single clamp is clamped on the movable clamp seat of the torsion testing machine, and one end of the sample is installed in the jaw of the front end of the handle rod of the first single clamp, and the tapered sleeve on the first single clamp is tightened to complete Clamp this end, slowly move and twist the movable clamp seat of the torsion testing machine, so that the other end of the sample enters the jaw of the front end of the handle rod of the second single clamp, and tighten the tapered sleeve on the second single clamp to complete another test. Clamped at one end, the torsion test can then be performed.

The above preferred embodiments have further described the purpose, technical solutions and advantages of the utility model in detail. It should be understood that the above descriptions are only preferred embodiments of the utility model and are not intended to limit the utility model. For new models, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims (6)

1. An auxiliary fixture suitable for torsion tests on short and small specimens, characterized in that it includes two paired single fixtures, the single fixture includes a handle rod and a tapered sleeve, the front end of the handle rod is provided with a jaw, and the inner surface of the jaw is Stripes are processed, the front end of the shank is provided with an external thread on the back side of the clamp, and a through hole is arranged in the tapered sleeve. The maximum diameter of the tapered hole is the same, the inner surface of the cylindrical hole is provided with an internal thread, and the tapered sleeve is set on the front end of the shank and screwed with the thread. 2. The auxiliary fixture suitable for the torsion test of short and small specimens according to claim 1, characterized in that: the front end of the handle is smaller than the rear end of the handle, and the rear end of the handle is the same size as the standard sample for the torsion test . 3. The auxiliary fixture suitable for the torsion test of short and small samples according to claim 1, characterized in that: the front end of the shank is processed with rounded chamfers. 4. The auxiliary fixture suitable for the torsion test of short and small samples according to claim 1, characterized in that two strip-shaped openings are symmetrically arranged on the outer periphery of the jaw along the axial direction of the jaw. 5. The auxiliary fixture suitable for torsion test of short and small samples according to claim 4, characterized in that: the diameter of the jaw is not larger than the maximum diameter of the taper hole and not smaller than the minimum diameter of the taper hole. 6. The auxiliary fixture suitable for the torsion test of short and small samples according to claim 1, characterized in that: the outer periphery of the rear part of the tapered sleeve is provided with a striped part.