Positioning device for thin plate impact standard sample

Abstract

The utility model belongs to the field of mechanical detection, and particularly relates to a positioning device for a thin-plate impact standard sample, which is characterized by comprising a fixing frame, a positioning block, a longitudinal fixing bolt and a transverse fixing bolt, a front-back through groove is arranged in the middle of the fixing frame, the top of the fixing frame is open, and the positioning block is of a C-shaped structure. A transverse fixing bolt is arranged on the left side or the right side of the fixing frame, so that the positioning block is fixed in the through groove of the fixing frame; a V-shaped outline positioning cone is arranged in the middle of the C-shaped groove of the positioning block and is matched with a V-shaped notch in the impact sample blank; the two sides of the opening of the fixing frame are each provided with a longitudinal fixing bolt, and the lower ends of the longitudinal fixing bolts are pressed on the upper surface of the impact sample blank. The device has the beneficial effects that the device is used for gluing a non-standard impact sample into a standard impact sample close to 10mm, so that a sheet impact sample conforms to the standard impact sample of GB / T229-2020, the device is simple and convenient to operate, and the sizes of the prepared samples are more consistent.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical testing, and in particular relates to a positioning device for a thin plate impact standard specimen. Background Art

[0002] Impact test is a test method to evaluate the safety, reliability and effectiveness of products when subjected to external impact or action. In the application of structural steel for engineering, standard specimen impact test is generally required for steel with a thickness greater than 10 mm, and the impact absorption energy index is specified. The main means of evaluating the material toughness index is to evaluate the impact absorption energy. The thickness of metal sheet materials is usually 1 to 5 mm. There are a large number of impact behaviors in metal sheet materials in engineering applications. The impact behavior develops rapidly, the destruction process is short, and it is difficult to accurately predict, posing a threat to the safety of the structure. With the rapid development of the automobile industry, researchers have proposed test requirements for the impact of cold-rolled thin plates at different temperatures. Through experimental research, the physical nature and change law of the impact behavior of metal sheet materials are mastered, and the impact absorption energy and ductile-brittle transition temperature indicators of thin plate impact tests are given.

[0003] At present, there are generally three methods for impact testing of thin plate materials. The first method is to place the impact specimen made of thin plate material directly on the support. This method has little effect on high-energy impact tests, but for low-energy impact tests, because the pendulum needs to absorb extra energy, it will affect the test results. However, due to the small thickness of metal sheet materials, the impact absorption energy is low, and the test results of this detection method are inaccurate. The second method is to place a gasket of appropriate thickness on the support of the pendulum impact tester so that the height of the specimen impact center is 5mm (equivalent to the height of the impact center of a standard specimen with a width of 10mm). This method has little effect on the impact test of high-strength thin plate materials, but for low-strength metal sheet materials, due to their small thickness and softness, the specimen will not break and the result is invalid. The third method is to glue multiple impact specimens made of thin plate materials into a standard impact specimen close to 10mm for impact testing. At present, most of them are handmade, with low production efficiency, large dimensional deviation, and poor repeatability. Utility Model Content

[0004] The purpose of the utility model is to provide a positioning device for a thin plate impact standard specimen, which overcomes the shortcomings of the prior art and is used to glue non-standard impact specimens into standard impact specimens close to 10 mm, so that the thin plate impact specimens conform to the standard impact specimens of GB / T229-2020, and can accurately evaluate the impact absorption energy of the thin plate, improve production efficiency, make the size more consistent, and help improve the repeatability of test data.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A positioning device for a thin plate impact standard specimen comprises a fixing frame, a positioning block, a longitudinal fixing bolt and a transverse fixing bolt. A through slot which is transparent from front to back is provided in the middle of the fixing frame, the top of the fixing frame is open, the positioning block is a C-shaped structure, a transverse fixing bolt is provided on the left or right side of the fixing frame, so that the positioning block is fixed in the through slot of the fixing frame; a V-shaped contour positioning cone is provided in the center of the C-shaped slot of the positioning block, and the V-shaped contour positioning cone matches the V-shaped notch on the impact specimen; a longitudinal fixing bolt is provided on each side of the opening of the fixing frame, and the lower end of the longitudinal fixing bolt is pressed on the upper surface of the impact specimen.

[0007] Furthermore, the threads on the longitudinal fixing bolts and the transverse fixing bolts are fine threads.

[0008] Furthermore, the impact sample blank is formed by stacking and bonding a plurality of pre-processed non-standard thin plates with a thickness of 1 to 5 mm.

[0009] Furthermore, the angle of the V-shaped contour positioning cone is 45°±2°.

[0010] Furthermore, the overall thickness of the impact sample is 10 mm.

[0011] Furthermore, the bottom of the longitudinal fixing bolt is ground and polished.

[0012] Furthermore, a polytetrafluoroethylene coating is provided on the bottom of the longitudinal fixing bolt.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1) It is used to glue non-standard impact specimens into standard impact specimens close to 10mm, so that the thin plate impact specimens meet the standard impact specimens of GB / T229-2020. The device is simple and easy to operate, and the size of the prepared specimens is more consistent, which solves the technical problems of low production efficiency and large size deviation in the process of preparing standard impact specimens through non-standard thin plate impact specimens in the prior art.

[0015] 2) It can accurately evaluate the impact absorption energy of thin plates. In the process of testing the low-temperature impact toughness of thin steel plates, it ensures the accuracy of the test results and significantly improves the repeatability of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of a rectangular fixed frame structure in an embodiment of the utility model;

[0018] Figure 3 yes Figure 2A top view of

[0019] Figure 4 This is a schematic diagram of the structure of the V-shaped notch positioning block in the embodiment of the utility model;

[0020] Figure 5 yes Figure 4 Top view of the .

[0021] In the figure: 1-fixing frame, 2-positioning block, 3-longitudinal fixing bolt, 4-transverse fixing bolt, 5-through groove, 6-V-shaped contour positioning cone, 7-impact sample blank. DETAILED DESCRIPTION

[0022] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0024] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.

[0025] See Figure 1-5 , is a schematic diagram of the structure of a positioning device for a thin plate impact standard specimen of the utility model, comprising a fixing frame 1, a positioning block 2, a longitudinal fixing bolt 3 and a transverse fixing bolt 4. A through slot 5 is provided in the middle of the fixing frame 1, the top of the fixing frame 1 is open, the positioning block 2 is a C-shaped structure, a transverse fixing bolt 4 is provided on the left or right side of the fixing frame 1, so that the positioning block 2 is fixed in the through slot 5 of the fixing frame 1; a V-shaped contour positioning cone 6 is provided in the center of the C-shaped groove of the positioning block 2, and the angle of the V-shaped contour positioning cone 6 is 45°±2°, which matches the V-shaped notch on the impact specimen 7. A longitudinal fixing bolt 3 is provided on each side of the opening of the fixing frame 1, and the lower end of the longitudinal fixing bolt 3 is pressed on the upper surface of the impact specimen 7. The impact specimen 7 is formed by stacking and bonding multiple pre-processed non-standard thin plates with a thickness of 1 to 5 mm. The overall thickness of the impact specimen 7 is 10 mm, which meets the standard impact specimen requirements of GB / T229-2020.

[0026] The threads on the longitudinal fixing bolt 3 and the transverse fixing bolt 4 are fine threads, which have an anti-loosening effect.

[0027] The bottom of the longitudinal fixing bolt 3 is ground and polished. The bottom of the longitudinal fixing bolt 3 is provided with a polytetrafluoroethylene coating to avoid scratching the surface of the impact sample blank 7.

[0028] When the embodiment of the utility model is used, the positioning block 2 is first inserted into the fixing frame 1, and the positioning block 2 is fixed by the transverse fixing bolt 4, so that the whole device forms a solid whole; the fixing frame 1 and the positioning block 2 cooperate in a way that the impact sample 7 can be positioned in three directions, namely, transverse, longitudinal and V-shaped contour positioning cone 6, to ensure the mutual verticality and parallelism of the prepared impact sample 7; the impact sample 7 is processed by wire cutting with a thin plate, and the size is uniform. After the metal adhesive is stirred evenly, it is thinly and evenly applied to the adhesive surface of the thin plate, and then glued layer by layer to form a standard impact specimen. The number of thin plates is generally calculated by dividing the thickness of the impact sample 7 by the thickness of the thin plate, which is 10 mm. In principle, the thickness of the glued impact specimen should not exceed 10 mm; after the metal adhesive is cured, the longitudinal fixing bolt 3 and the transverse fixing bolt 4 are released to obtain the prepared standard size impact sample 7; the impact sample 7 prepared by the device has the characteristics of simple production, convenient operation and standard size, and solves the problem that the impact test of the existing technology cannot cover the impact test of the thin plate and the impact tough-brittle transition temperature of the thin plate cannot be evaluated.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning device for a thin plate impact standard specimen, characterized in that: It includes a fixing frame, a positioning block, a longitudinal fixing bolt and a transverse fixing bolt. A through slot which is transparent from front to back is provided in the middle of the fixing frame. The top of the fixing frame is open. The positioning block is a C-shaped structure. A transverse fixing bolt is provided on the left or right side of the fixing frame to fix the positioning block in the through slot of the fixing frame. A V-shaped positioning cone is provided in the center of the C-shaped slot of the positioning block. The V-shaped positioning cone matches the V-shaped notch on the impact sample blank. A longitudinal fixing bolt is provided on each side of the opening of the fixing frame. The lower end of the longitudinal fixing bolt is pressed on the upper surface of the impact sample blank.

2. A positioning device for a thin plate impact standard specimen according to claim 1, characterized in that: The threads on the longitudinal fixing bolts and the transverse fixing bolts are fine threads.

3. The positioning device for a thin plate impact standard specimen according to claim 1, characterized in that: The impact sample blank is formed by stacking and bonding a plurality of pre-processed non-standard thin plates with a thickness of 1 to 5 mm.

4. The positioning device for a thin plate impact standard specimen according to claim 1, characterized in that: The angle of the V-shaped contour positioning cone is 45°±2°.

5. The positioning device for a thin plate impact standard specimen according to claim 1, characterized in that: The overall thickness of the impact specimen is 10 mm.

6. The positioning device for a thin plate impact standard specimen according to claim 1, characterized in that: The bottom of the longitudinal fixing bolt is ground and polished.

7. A positioning device for a thin plate impact standard specimen according to claim 6, characterized in that: The bottom of the longitudinal fixing bolt is provided with a polytetrafluoroethylene coating.

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