Vertical clamp for measuring post-fracture scale distance and post-fracture diameter of circular tensile sample

Abstract

The utility model discloses a vertical clamp for measuring the scale distance and the diameter of a round tensile sample after fracture, which comprises a positioning base, a positioning vertical rod is detachably or welded on the positioning base, a detachable clamping device is arranged along the axis direction of the positioning vertical rod, and the clamping device is connected with the positioning vertical rod in a detachable manner. The clamping device is provided with a clamping hole for clamping the head of the circular tensile sample, the clamping device comprises a first clamping rod and a second clamping rod, the first clamping rod and the second clamping rod are arranged in parallel at an interval, and the two ends of the first clamping rod and the two ends of the second clamping rod are provided with two symmetrical clamping holes. According to the utility model, the test sample can be rapidly clamped, the fracture of the test sample can be accurately butted, the axis is consistent, the measurement is accurate, the measurement error is reduced, the uncertainty of the percentage elongation after fracture and the percentage reduction of area is reduced, and the device has the characteristics of simple structure, convenience in use, safety in operation, accurate measurement result and high working efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing equipment, and in particular relates to a vertical clamp for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen. Background Art

[0002] The mechanical properties of metal materials are the delivery conditions for steel products. Among these, the elongation and reduction of area of ​​tensile specimens are crucial test items. Accurate, rapid, and consistent testing methods are essential to minimize human error. GB / T 228 defines elongation as the percentage of the residual elongation after fracture to the original gauge length. Therefore, the accuracy of elongation determination depends on measuring the gauge length. The key to measuring gauge length is to butt-join the two halves of the specimen at room temperature, ensuring that the axes of the two halves are aligned, and then measure the gauge length after fracture. Reduction of area is defined as the ratio of the maximum reduction in cross-sectional area of ​​the specimen after fracture to the original cross-sectional area. Therefore, the accuracy of measuring reduction of area depends on measuring the diameter after fracture. The key to measuring the diameter after fracture is to carefully butt-join the broken halves of the specimen so that their axes are aligned. When taking the reading, care should be taken to ensure that the fracture surface is not displaced. The method used for daily measurement of post-fracture gauge length and post-fracture diameter is: long samples are measured with a caliper on a platform, and short samples are measured by holding the sample in one hand and the caliper in the other hand. During measurement, there are problems such as misalignment of the sample fracture surface, shaking, slippage, and the two sections of the sample not being on the same axis, which have a great impact on the measurement results.

[0003] In view of the above factors, a vertical fixture is specially designed to measure the post-fracture gauge length and post-fracture diameter of circular tensile specimens. It can ensure rapid clamping of the specimen, achieve accurate docking of the specimen fracture surfaces and alignment of the axes, implement accurate measurement, reduce measurement errors, and reduce the uncertainty of post-fracture elongation and cross-sectional shrinkage. It has the characteristics of simple structure, easy use, safe operation, accurate measurement results and high work efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen, so as to solve the problems raised in the above background technology.

[0005] The purpose of the utility model is achieved through the following technical solutions: a vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen, comprising a positioning base, a positioning rod connected to the positioning base in a detachable manner or by welding, and a detachable clamping device provided along the axis direction of the positioning rod;

[0006] The clamping device is provided with a clamping hole for clamping the head of the circular tensile specimen.

[0007] Furthermore, the clamping device includes a first clamping rod and a second clamping rod, the first clamping rod and the second clamping rod are arranged in parallel with each other, and two symmetrical clamping holes are formed at both ends of the first clamping rod and the second clamping rod.

[0008] Furthermore, clamping screws are provided at both ends of the first clamping rod and the second clamping rod along the horizontal direction of the first clamping rod and the second clamping rod.

[0009] Furthermore, the clamping screw passes through the clamping hole and cooperates with the threaded holes at both ends of the first clamping rod and the second clamping rod.

[0010] Furthermore, the diameter of the clamping hole is the same as the diameter of the head of the circular tensile specimen, and the diameter of the clamping hole is φ20 mm.

[0011] Furthermore, positioning blocks are respectively installed on the positioning upright rod and below the first clamping rod and the second clamping rod.

[0012] Furthermore, the positioning block is a cylindrical sleeve structure, a positioning hole that penetrates the positioning pole is opened on the cylindrical sleeve structure, and the cylindrical sleeve structure and the positioning pole are fixed by the positioning screw and nut.

[0013] Furthermore, the positioning upright pole is provided with a plurality of through positioning holes at intervals;

[0014] The center holes of the first clamping rod and the second clamping rod pass through the positioning rod and are fixed to the positioning rod with positioning screws.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model can ensure rapid clamping of the sample, achieve accurate docking of the sample fracture and consistency of the axis, implement accurate measurement, reduce measurement errors, and reduce the uncertainty of elongation after fracture and cross-sectional shrinkage. It has the characteristics of simple structure, easy use, safe operation, accurate measurement results and high work efficiency.

[0017] The utility model discloses a vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen. The utility model is designed with a vertical structure, which is convenient for butting two sections of the specimen with the same axis. The utility model can measure the diameter in any direction at the fracture, discover the diameter change, and conveniently take photos for preservation.

[0018] The utility model is simple and convenient to use, safe to operate, and as a measurement auxiliary tool, lays a foundation for accurately measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen, ensures the accuracy of the test data, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0020] Figure 2 It is a planar schematic diagram of the utility model;

[0021] Figure 3 This is a schematic diagram of the installation of the first clamping rod and the second clamping rod of the utility model. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] like Figure 1-3 As shown, a vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen is characterized by comprising: a positioning base 1, to which a positioning upright 2 is detachably connected or welded, and a detachable clamping device 3 is provided along the axis of the positioning upright 2;

[0024] The clamping device 3 is provided with a clamping hole 4 for clamping the head of the circular tensile specimen.

[0025] In order to facilitate the docking of two sections of the specimen with the same axis when in use, and to measure the diameter in any direction at the fracture to detect the diameter change, the clamping device 3 includes a first clamping rod 5 and a second clamping rod 6. The first clamping rod 5 and the second clamping rod 6 are arranged in parallel with each other, and two symmetrical clamping holes 4 are opened at both ends of the first clamping rod 5 and the second clamping rod 6.

[0026] In order to facilitate the clamping and fixing of the circular tensile specimen in use, clamping screws 7 are provided at both ends of the first clamping rod 5 and the second clamping rod 6 along the horizontal direction of the first clamping rod 5 and the second clamping rod 6. The clamping screw 7 passes through the clamping hole 4 and cooperates with the threaded holes at both ends of the first clamping rod 5 and the second clamping rod 6.

[0027] In order to facilitate the matching of the circular tensile specimen with the clamping hole in use, the diameter of the clamping hole 4 is the same as the diameter of the head of the circular tensile specimen, and the diameter of the clamping hole 4 is φ20 mm.

[0028] In order to facilitate the first clamping rod 5 and the second clamping rod 6 to remain parallel and be positioned according to the length of the sample when in use, positioning blocks 8 are installed below the first clamping rod 5 and the second clamping rod 6 on the positioning rod 2. The positioning block 8 is a cylindrical sleeve structure, and a positioning hole that passes through the positioning rod 2 is opened on the cylindrical sleeve structure. The cylindrical sleeve structure and the positioning rod 2 are fixed by the positioning screws and nuts.

[0029] In order to facilitate the installation of the first clamping rod 5 and the second clamping rod 6 through different positioning holes in the use state so as to use samples of different lengths, the positioning rod 2 is provided with a plurality of through positioning holes at intervals;

[0030] The first clamping rod 5 and the second clamping rod 6 are punched through the center of the positioning rod 2 and fixed to the positioning rod 2 with positioning screws.

[0031] The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen clamps the post-fracture circular specimen and uses a caliper to measure the post-fracture gauge length and two post-fracture diameters (the two measurements are made in directions 90 degrees apart and the average value is calculated).

[0032] The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of circular tensile specimens is designed with a vertical structure, which facilitates the docking of two specimen sections with consistent axes. At the same time, the diameter in any direction at the fracture can be measured to detect its diameter change, and it is convenient to take pictures and preserve them.

[0033] The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of circular tensile specimens can quickly clamp the specimen, achieve accurate docking of the specimen fracture surfaces and align the axes, implement accurate measurements, reduce measurement errors, and reduce the uncertainty of post-fracture elongation and cross-sectional shrinkage. It has the characteristics of simple structure, easy use, safe operation, accurate measurement results, and high work efficiency.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen, characterized by: It comprises a positioning base (1), the positioning base (1) is connected to a positioning upright pole (2) in a detachable manner or by welding, and a detachable clamping device (3) is provided along the axial direction of the positioning upright pole (2); The clamping device (3) is provided with a clamping hole (4) for clamping the head of the circular tensile specimen.

2. The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen according to claim 1, characterized in that: The clamping device (3) comprises a first clamping rod (5) and a second clamping rod (6), wherein the first clamping rod (5) and the second clamping rod (6) are arranged in parallel with each other, and two symmetrical clamping holes (4) are formed at both ends of the first clamping rod (5) and the second clamping rod (6).

3. The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen according to claim 2, characterized in that: Clamping screws (7) are provided at both ends of the first clamping rod (5) and the second clamping rod (6) along the horizontal direction of the first clamping rod (5) and the second clamping rod (6).

4. The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen according to claim 3, characterized in that: The clamping screw (7) passes through the clamping hole (4) and cooperates with the threaded holes at both ends of the first clamping rod (5) and the second clamping rod (6).

5. The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen according to claim 4, characterized in that: The diameter of the clamping hole (4) is the same as the diameter of the head of the circular tensile specimen, and the diameter of the clamping hole (4) is φ20 mm.

6. The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen according to claim 5, characterized in that: Positioning blocks (8) are respectively installed below the first clamping rod (5) and the second clamping rod (6) on the positioning upright rod (2).

7. The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen according to claim 6, characterized in that: The positioning block (8) is a cylindrical sleeve structure, and a positioning hole is provided on the cylindrical sleeve structure and is communicated with the positioning upright pole (2). The cylindrical sleeve structure and the positioning upright pole (2) are fixed by a positioning screw and a nut.

8. The vertical fixture for measuring the post-fracture gauge length and post-fracture diameter of a circular tensile specimen according to claim 7, characterized in that: The positioning upright pole (2) is provided with a plurality of through positioning holes at intervals; The center holes of the first clamping rod (5) and the second clamping rod (6) pass through the positioning rod (2) and are fixed to the positioning rod (2) with positioning screws.

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