Accurate measurement device for percentage elongation after fracture of rod-shaped sample

Abstract

The utility model provides a rodlike sample after-fracture elongation accurate measuring device, which comprises a base, a frame, sample carrying tables, a support device, a slideway and a measuring scale, the frame is arranged on the base and comprises a first support frame and a second support frame, the sample carrying tables are arranged on the first support frame and the second support frame, and the measuring scale is arranged on the slideway. The two fractured parts of the sample are respectively arranged on the sample carrying tables on the two sides, fractures of the samples on the two sides are butted and aligned, and the supporting device is mounted on the frame, is positioned below the sample and is used for supporting the fractures of the sample; the measuring scale is installed on the slide way, and the two sides of the slide way are installed on the first supporting frame and the second supporting frame. According to the utility model, two fractures can be accurately aligned, a proper axial load is applied, and the accuracy of a measurement result and the measurement efficiency are ensured by means of a measurement tool carried by the device.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical property testing of metal materials, and particularly relates to a device for accurately measuring the elongation after fracture of a rod-shaped specimen. Background Technique

[0002] The tensile test is an important method for evaluating the properties of metal materials under different working conditions, such as strength, elongation, and reduction of area. The rod-shaped test piece is one of the basic specimen shapes of the tensile test. The rod-shaped specimen has the advantages of convenient processing, avoiding the influence of structure, and being easy for subsequent surface treatment. However, the rod-shaped specimen generally has a stepped structure, and it is difficult to align the fracture surfaces after tensile fracture, which will lead to inaccurate measurement results of the elongation rate and affect the measurement of the tensile results. Therefore, the utility model of a device that can accurately measure the elongation after fracture has important engineering significance for the tensile test. The existing measurement methods basically rely on the experimenter to manually align the specimen for measurement, and there are the following disadvantages:

[0003] 1. When manually holding the specimen to measure the gauge length after fracture, the measurement efficiency may be affected due to the inexperience of the operator.

[0004] 2. Even if two fractured specimens are successfully held and aligned by hand, due to uneven human force, there may be a certain degree of non-coaxiality between the two fractured specimens, affecting the authenticity of the measured gauge length after fracture.

[0005] 3. Manually holding the specimen cannot accurately align the two fracture surfaces, or the force applied when aligning the two fracture surfaces is uneven, resulting in a large measured gauge length after fracture.

[0006] 4. After manual alignment, an additional vernier caliper is used for measurement. Since each person's proficiency in using the caliper is different and the caliper is not parallel to the specimen, the caliper readings are different, resulting in measurement result deviations. Content of the Utility Model

[0007] In view of the above-mentioned technical problems, a device for accurately measuring the elongation after fracture of a rod-shaped specimen is provided. The device of the utility model can accurately align the two fracture surfaces, apply an appropriate axial load, and rely on the measuring tools carried by the device itself, thereby ensuring the accuracy and measurement efficiency of the measurement results.

[0008] The technical means adopted by the utility model are as follows:

[0009] An accurate measurement device for the elongation after fracture of a rod-shaped specimen, comprising: a base, a frame, a specimen stage, a support device, a slideway and a measuring ruler. The frame is installed on the base and includes a first support frame and a second support frame. The specimen stage is installed on both the first support frame and the second support frame. The two fractured parts of the specimen are respectively placed on the specimen stages on both sides, and the fracture surfaces of the specimens on both sides are butted and aligned. The support device is installed on the frame and is located below the specimen for supporting the fracture surface of the specimen. The measuring ruler is installed on the slideway, and both sides of the slideway are installed on the first support frame and the second support frame.

[0010] Further, the support device includes a moving platform and a support bolt. Both sides of the moving platform are respectively installed in the square holes opened on the first support frame and the second support frame. The lower part of the support bolt is connected to the moving platform, and the top end of the support bolt contacts the fracture surface of the specimen.

[0011] Further, the support device further includes a slider. A chute is opened on the moving platform, and the slider is slidably connected in the chute. A threaded hole is opened on the slider, and the lower part of the support bolt is fitted and connected in the threaded hole.

[0012] Further, special-shaped holes are opened on both the first support frame and the second support frame. The special-shaped holes are square holes with a V-shaped structure at the upper part. A V-shaped groove is provided above the specimen stage, and the lower part is of a square structure. The specimen stage is closely slidably connected in the special-shaped hole and slides along the special-shaped hole.

[0013] Further, tightening bolts are threadedly connected to both the first support frame and the second support frame. The tightening bolts on both sides are respectively screwed into the frame for tightly pressing the specimens on both sides along the axial direction of the specimen.

[0014] Further, the measuring ruler is provided with a round hole, and the round hole is fitted and connected to the slideway and slides along the slideway. Round holes are opened on both the first support frame and the second support frame, and both sides of the slideway are connected to the round holes.

[0015] Further, the base is connected to the frame through a mortise and tenon groove.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The utility model uses bolts to tighten, avoiding the problem of poor coaxiality of the specimen during measurement due to holding the fractured specimen by hand.

[0018] 2. The utility model uses a movable specimen stage to ensure that specimens of different lengths can be measured, and at the same time, it ensures that the support bolts can support at different fracture positions.

[0019] 3. The utility model uses a measuring ruler to slide on a slideway to measure the gauge length of the post-fracture specimen, which is convenient for measurement, ensures accurate results, and avoids errors caused by manual measurement with a ruler.

[0020] 4. The utility model uses a slidable support bolt to support the fracture of the fractured specimen, which can ensure good alignment of different fracture positions and different specimen sizes at the same time.

[0021] 5. The utility model uses a rotatable support bolt structure, which has a good support effect on fractured specimens with different thicknesses and different cross-sectional shrinkage rates.

[0022] Based on the above reasons, the utility model can be widely promoted in the fields such as the measurement of post-fracture elongation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is the overall assembly engineering drawing of the present utility model.

[0025] Figure 2 It is the side view of the present utility model.

[0026] Figure 3 It is the three-dimensional view of the device of the present utility model.

[0027] Figure 4 It is the structural schematic diagram of the base of the present utility model, where (a) is the top view and (b) is the side view.

[0028] Figure 5 It is the structural schematic diagram of the frame of the present utility model, where (a) is the side view and (b) is the front view.

[0029] Figure 6 It is the structural schematic diagram of the moving platform of the present utility model, where (a) is the top view and (b) is the side view.

[0030] Figure 7 It is the structural schematic diagram of the support bolt of the present utility model, where (a) is the side view and (b) is the front view.

[0031] Figure 8 It is the structural schematic diagram of the slider of the present utility model, where (a) is the side view and (b) is the side view.

[0032] Figure 9This is a schematic structural diagram of the sample stage of the present utility model, where (a) is a top view and (b) is a side view.

[0033] Figure 10 This is a schematic structural diagram of the tightening bolt of the present utility model, where (a) is a side view and (b) is a front view.

[0034] Figure 11 This is a schematic structural diagram of the specimen of the present utility model, where (a) is a front view and (b) is a side view.

[0035] Figure 12 This is a schematic structural diagram of the slideway of the present utility model, where (a) is a side view and (b) is a front view.

[0036] Figure 13 This is a schematic structural diagram of the measuring scale of the present utility model, where (a) is a front view and (b) is a side view.

[0037] In the figure: 1. Base; 2. Frame; 3. Moving platform; 4. Support bolt; 5. Slide block; 6. Sample stage; 7. Tightening bolt; 8. Specimen; 9. Slideway; 10. Measuring scale. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] The present utility model provides a precise measurement device for the elongation after fracture of a rod-shaped specimen, which is a precise measurement device for the elongation after fracture of a rod-shaped tensile fracture specimen. The present utility model aims to solve the problem of accurately measuring the elongation rate of a rod-shaped fracture specimen, and provides a measurement device for the rod-shaped specimen after fracture that can ensure that the two specimens are coaxially aligned after alignment, the fracture surfaces of the fractured specimens are well aligned, the gauge length after fracture is accurately measured, the structure is simple, and the operation is convenient.

[0040] A precise measurement device for the elongation after fracture of a rod-shaped specimen of the present utility model includes: a base 1, a frame 2, a moving platform 3, a support bolt 4, a slider 5, a specimen stage 6, a tightening bolt 7, a specimen 8, a slideway 9, and a measuring scale 10. The frame 2 is installed on the base 1, and the base 1 is connected to the frame 2 through a mortise and tenon groove. The frame 2 includes a first support frame and a second support frame arranged at intervals left and right. The frame 2 is tightly connected to the moving platform 3 through a square hole, and both sides of the moving platform 3 are respectively installed in the square holes opened on the first support frame and the second support frame. The frame 2 is tightly connected to the specimen stage 6 through a V-shaped hole, and at the same time, the specimen stage 6 can slide along the square hole groove. Among them, special-shaped holes are opened on both the first support frame and the second support frame. The special-shaped hole is a square hole with a V-shaped structure at the upper part. A V-shaped groove is provided above the specimen stage 6, and the lower part is of a square structure; the specimen stage 6 is tightly and slidably connected in the special-shaped hole and slides along the special-shaped hole. The two broken parts of the specimen 8 are respectively placed on the specimen stages 6 on both sides, and the fracture surfaces of the specimens 8 on both sides are butted and aligned. The frame 2 is connected to the slideway 9 through a circular hole. Circular holes are opened on the first support frame and the second support frame, and both sides of the slideway 9 are connected to the circular holes. The moving platform 3 is provided with a square hole groove, and the slider 5 can slide along the groove in the through groove (square hole groove). The slider 5 is provided with a threaded hole, and the lower part of the support bolt 4 is connected thereto through a thread. The support bolt 4 is located directly below the specimen 8, and the top end of the support bolt 4 contacts the fracture surface of the specimen 8. The tightening bolt 7 is connected to the frame 2 through a thread. The tightening bolt 7 can be screwed in to tighten the specimen 8. Among them, the tightening bolts 7 are threadedly connected to both the first support frame and the second support frame, and the tightening bolts 7 on both sides are respectively screwed into the frame 2 to tighten the specimens 8 on both sides along the axial direction of the specimen 8. The measuring scale 10 is provided with a circular hole, and the circular hole is connected to the slideway 9 in a matching manner. The measuring scale 10 can slide along the measuring slideway 9. The measuring scale 10 is located above one side of the specimen 8.

[0041] 1. To avoid the phenomenon that different gripping forces are caused by holding the specimen by hand during the traditional measurement of the elongation after fracture, and the fracture alignment has a bending phenomenon, resulting in inaccurate measurement. Align the fractured specimen on the specimen stage 6, and use the tightening bolt 7 to tighten the specimen, so as to ensure the coaxiality of the aligned specimen and increase the accuracy of measuring the elongation after fracture.

[0042] 2. To ensure convenient and accurate measurement of the elongation after fracture, use the measuring scale 10 to mark the starting point, and then slide to the end point on the measuring slideway 9, which is the fracture length of the fractured specimen 8.

[0043] 3. The specimen stage 6 and the frame 2 are in tight fit. The specimen stage 6 can slide on the frame 2, which can not only ensure that the specimen stage 6 holds specimens of different lengths, but also ensure the relative position between the specimen stage 6 and the specimen 8.

[0044] 4. The lower side of the specimen 8 is supported by the support bolt 4. The support bolt 4 is connected to the moving platform 3 by a slider 5. As the slider 5 slides on the moving platform 3, it can ensure that the support bolt 4 supports different fracture positions, thereby ensuring the coaxiality of the fractured specimen.

[0045] The measuring method of the present utility model is as follows:

[0046] 1. When measuring, first place the specimen 8 into the specimen stage 6, adjust the state of the specimen 8 so that the fracture of the specimen 8 is aligned and the marking point faces the visual direction.

[0047] 2. Slide the support bolt 4 to the fracture position and screw the support bolt 4 upward to hold the fracture of the fractured specimen.

[0048] 3. Tighten the tightening bolt 7 to apply appropriate pressure to both ends of the fractured specimen, so as to ensure that the fractured specimen has good coaxiality.

[0049] 4. Slide the measuring scale 10 so that the marking point of the measuring scale 10 is placed at the first point position of the gauge length of the specimen 8, and zero the value of the measuring scale 10.

[0050] 5. Slide the measuring scale 10 to the other point position of the gauge length, and the reading of the measuring scale 10 is the accurate measured value of the post-fracture gauge length of the specimen 8.

[0051] 6. Calculate the elongation after fracture of the specimen 8.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A precise measuring device for elongation after fracture of a rod-shaped specimen, characterized in that: include: A base (1), a frame (2), a sample carrier (6), a supporting device, a slideway (9) and a measuring ruler (10), wherein the frame (2) is mounted on the base (1) and comprises a first supporting frame and a second supporting frame, wherein the sample carrier (6) is mounted on the first supporting frame and the second supporting frame, and the two parts of the sample (8) after being broken are respectively placed on the sample carrier (6) on both sides, and the fracture surfaces of the samples (8) on both sides are butted and aligned, and the supporting device is mounted on the frame (2) and is located below the sample (8) and is used to support the fracture surface of the sample (8); the measuring ruler (10) is mounted on the slideway (9), and the two sides of the slideway (9) are mounted on the first supporting frame and the second supporting frame.

2. The device for accurately measuring the elongation after fracture of a rod-shaped specimen according to claim 1, characterized in that: The supporting device comprises a movable platform (3) and a supporting bolt (4), the two sides of the movable platform (3) are respectively mounted in square holes opened on a first supporting frame and a second supporting frame, the lower part of the supporting bolt (4) is connected to the movable platform (3), and the top end of the supporting bolt (4) is in contact with the fracture of the sample (8).

3. The device for accurately measuring the elongation after fracture of a rod-shaped specimen according to claim 2, characterized in that: The supporting device also includes a sliding block (5), a sliding groove is provided on the movable platform (3), the sliding block (5) is slidably connected in the sliding groove, a threaded hole is provided on the sliding block (5), and the lower part of the supporting bolt (4) is cooperatively connected in the threaded hole.

4. The device for accurately measuring the elongation after fracture of a rod-shaped specimen according to claim 1, characterized in that: The first support frame and the second support frame are both provided with special-shaped holes, wherein the special-shaped holes are square holes with a V-shaped structure at the top, and the sample carrier (6) is provided with a V-shaped groove at the top and a square structure at the bottom; the sample carrier (6) is tightly slidably connected in the special-shaped holes and slides along the special-shaped holes.

5. The device for accurately measuring the elongation after fracture of a rod-shaped specimen according to claim 1, characterized in that: The first support frame and the second support frame are both threadedly connected with tightening bolts (7), and the tightening bolts (7) on both sides are screwed into the frame (2) respectively, and are used to tighten the samples (8) on both sides along the axial direction of the samples (8).

6. The device for accurately measuring the elongation after fracture of a rod-shaped specimen according to claim 1, characterized in that: The measuring ruler (10) is provided with a circular hole, and the circular hole is matched and connected to the slideway (9) to slide along the slideway (9); the first support frame and the second support frame are provided with circular holes, and the two sides of the slideway (9) are connected to the circular holes.

7. The device for accurately measuring the elongation after fracture of a rod-shaped specimen according to claim 1, characterized in that: The base (1) is connected to the frame (2) via a tongue and groove joint.

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