Rotary pressure head tool for bending test

Abstract

The utility model relates to a rotary pressure head tool for an anti-bending test, which comprises a pressure head body, the lower end surface of the pressure head body is provided with a V-shaped pressure groove which is concave upwards, and two inclined surfaces of the V-shaped pressure groove are both contacted with a sample; the adjusting head is movably arranged at the upper end of the pressing head body, and the pressing head body can rotate at the lower end of the adjusting head. Compared with the prior art, the pressure head has the beneficial effects that the pressure head body is movably arranged, so that the position of the pressure head body can be automatically adjusted, the pressure head body and a sample can be automatically positioned, the positioning operation before a test is omitted, the operation process is saved, and the positioning is accurate; a plurality of anti-clamping structures are arranged, so that clamping stagnation of the pressure head body in the rotating process is avoided; the structure is simple, dismounting is convenient, and the tool is convenient to replace and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of bending processing of metal materials, in particular to a rotary pressure head tooling for bending resistance test. Background Art

[0002] The metal bending test refers to the test specimen being subjected to plastic deformation on a bending device without changing the direction of force until the specified bending angle is reached. The bending test is generally completed on a bending test device. The bending test device can be divided into a roller-type bending device equipped with two support rollers and a bending pressure head, a mold-type bending device, and a vise-type bending device.

[0003] The bending press heads of the three bending devices mentioned above are generally fixed on a testing machine or a press. When the working surface of the bending press head is damaged and needs to be polished and repaired, it is very inconvenient.

[0004] Taking the bending test of the friction weld shell of the long handle of the ball cage as an example, the two ends of the ball cage shell are fixed by V-blocks, and the middle part is applied with a set pressure and displacement from top to bottom by the pressure head to determine whether the friction weld point will break after the long handle is bent.

[0005] A Chinese utility model patent with authorization announcement number CN216559979U discloses a tool for completing a bending test using a testing machine as an aid. This tool belongs to the technical field of metal material bending processing and includes: a support seat, a testing machine, and a bending press head. The top surface of the support seat is provided with a V-shaped groove. The testing machine is arranged above the support seat. The bending press head is arranged above the support seat and connected to the testing machine. The bending press head is provided with a working portion that matches the shape of the V-shaped groove. The working portion and the V-shaped groove are used to place the sample. The bending press head of the utility model can be disassembled from the testing machine at any time, facilitating timely disassembly and maintenance. It has a simple structure and is easy to use and operate.

[0006] However, in this tooling, the lower end of the pressure head is set as an inverted triangle, and there is line contact between it and the specimen. During the pressing process, precise positioning is required to ensure the accuracy of the pressing position. For specimens with pipe structures, if one of the pressure head and the specimen is not positioned accurately, the contact line and the cross-section of the pipe will be tilted, resulting in inaccurate bending test results of the pipe. Utility Model Content

[0007] In order to solve the above problems existing in the prior art, the utility model provides a rotary pressure head tooling for bending resistance test.

[0008] The above-mentioned problem of the present invention is solved by the following technical solutions:

[0009] A rotary indenter tool for bending resistance test, comprising:

[0010] The indenter body has an upward concave V-shaped indentation groove on its lower end surface, and both inclined surfaces of the V-shaped indentation groove are in contact with the sample;

[0011] The adjusting head is movably arranged at the upper end of the pressure head body, and the pressure head body can rotate at the lower end of the adjusting head.

[0012] The above technical solution is further configured as follows: the pressure head body and the regulating head are threadedly connected.

[0013] The above technical solution is further configured as follows: an anti-stuck gap is left between the upper end surface of the pressure head body and the regulating head.

[0014] The above technical solution is further configured as follows: it further comprises a connecting screw, the adjusting head is provided with a through hole capable of accommodating the connecting screw to pass through and allowing the connecting screw to rotate;

[0015] The lower end of the connecting screw is threadedly connected to the pressing head body.

[0016] The above technical solution is further configured as follows: the connecting screw is configured from top to bottom in sequence as a limit head, a rod body and a threaded section;

[0017] The adjusting head is provided with a sink groove which cooperates with the limiting head.

[0018] The above technical solution is further configured as follows: the thickness of the limit head is smaller than the depth of the sink, and the difference is not smaller than the anti-stuck gap.

[0019] The above technical solution is further configured as follows: the length of the threaded hole in the press head body is greater than the length of the threaded section.

[0020] The above technical solution is further configured as follows: a first gap is left between the groove wall of the sink and the limit head, and a second gap is left between the inner wall of the through hole and the rod body;

[0021] The first gap is not smaller than the second gap.

[0022] The above technical solution is further configured as follows: the length of the rod body is greater than the length of the through hole.

[0023] The above technical solution is further configured as follows: a connection portion with an external thread is formed on the upper end surface of the adjusting head, and the sink groove is provided on the connection portion.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The indenter body is movable, so that it can automatically adjust its position and automatically locate itself with the specimen, saving the need for pre-test positioning operations and operating procedures, while ensuring accurate positioning.

[0026] 2. Multiple anti-jamming structures are set to prevent the indenter body from getting stuck during rotation;

[0027] 3. Simple structure and easy disassembly, making it convenient to replace and repair the tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the exploded structure of the present invention.

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of the present utility model.

[0030] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0031] Figure 4 Schematic diagram of the position of the indenter fixture and the specimen when they are not positioned.

[0032] Figure 5 This is a schematic diagram of the position structure of the indenter fixture and specimen after positioning.

[0033] Figure 6 Schematic diagram of the structure when the sample is pressed down and bent.

[0034] In the accompanying drawings, 100 is marked as the pressing head body; 101 is the V-shaped pressing groove;

[0035] 200, adjusting head; 211, sink; 210, connecting part;

[0036] 300, connecting screw; 310, limiting head; 320, rod body; 330, threaded section;

[0037] 400, sample;

[0038] 500, V-shaped block; 501, V-shaped frame groove;

[0039] a. Anti-stuck gap; b. First gap; c. Second gap; d. Sinking gap. DETAILED DESCRIPTION

[0040] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0041] like Figures 1-6As shown, this embodiment provides a rotating indenter tool for bending resistance testing.

[0042] A rotary indenter tool for bending resistance test, comprising:

[0043] The indenter body 100 has an upwardly concave V-shaped indentation groove 101 on its lower end surface, and both inclined surfaces of the V-shaped indentation groove 101 are in contact with the sample 400;

[0044] The adjusting head 200 is movably disposed at the upper end of the pressing head body 100 , and the pressing head body 100 can rotate at the lower end of the adjusting head 200 .

[0045] The above is the basic solution of this embodiment.

[0046] Specific reference Figure 4 and Figure 6 As shown, when conducting a bending test, a long tubular specimen 400 is placed on two V-blocks 500 and limited in the V-frame groove 501; a rotary pressing head tool is installed on the press, and the specimen 400 is pressed down from top to bottom above the specimen 400 to bend the test part of the specimen 400. By setting the downward pressure of the press, the bending resistance of the specimen 400 is tested.

[0047] In this embodiment, when the rotating indenter is pressing downward, the V-shaped groove 101 on the indenter body 100 clamps the sample 400 from top to bottom. When not positioned, the V-shaped groove is in an inclined state relative to the axis of the sample 400, so that point contact is formed between the two inclined surfaces and the outer surface of the sample 400. For details, see Figure 5 As shown;

[0048] As the press continues to press down, the rotating indenter moves downward, thereby increasing the interaction force between the two inclined surfaces and the outer surface of the sample 400; the reaction force of the sample 400 on the inclined surfaces is inclined relative to the inclined surfaces, and the component of the reaction force in the direction parallel to the inclined surfaces drives the indenter body 100 to rotate, thereby rotating the indenter body 100 to the correct test position, that is, Figure 6 The location shown;

[0049] It should be noted that the correct test position is that the two inclined surfaces of the V-shaped groove 101 on the indenter body 100 are symmetrically arranged on both sides of the sample 400, that is, the sample 400 is located in the middle of the V-shaped groove 101, so that the pressure exerted on the sample 400 by the two inclined surfaces is equal during the pressing process.

[0050] In this embodiment, the adjusting head 200 is installed on the press, and the pressing head body 100 can rotate 360° relative to the adjusting head 200 .

[0051] Specifically, the pressing head body 100 and the adjusting head 200 are threadedly connected.

[0052] In order to ensure that the indenter body 100 can always adapt to the position rotation of the sample 400 during the pressing process and does not reach the end position, in this embodiment, a space is provided between the indenter body 100 and the adjustment head 200.

[0053] In this embodiment, an anti-jamming gap a is left between the upper end surface of the pressing head body 100 and the adjusting head 200 .

[0054] When the ram body 100 rotates relative to the adjusting head 200, relative sliding occurs between the upper end surface of the ram body 100 and the lower end surface of the adjusting head 200. The sliding friction may cause the ram body 100 to be stuck during the rotation process. Therefore, an anti-stuck gap a is left between the upper end surface of the ram body 100 and the lower end surface of the adjusting head 200 so that the two end surfaces do not contact, thereby avoiding relative sliding.

[0055] The specific embodiment of the rotational connection between the pressing head body 100 and the adjusting head 200 is as follows: it further includes a connecting screw 300, and the adjusting head 200 is provided with a through hole capable of accommodating the connecting screw 300 and allowing the connecting screw 300 to rotate;

[0056] The lower end of the connecting screw 300 is threadedly connected to the press head body 100 .

[0057] Preferably, the connecting screw 300 is sequentially provided with a limit head 310, a rod body 320 and a threaded section 330 from top to bottom;

[0058] The adjusting head 200 is provided with a sinking groove 211 which cooperates with the limiting head 310 .

[0059] Specific reference Figure 1 and Figure 2 As shown, the diameter of the limiting head 310 is larger than that of the rod body 320. The limiting head 310 is limited in the sink 211, and the threaded end is threadedly connected to the pressure head body 100, thereby limiting the adjustment head 200 between the pressure head body 100 and the limiting head 310, so that the pressure head body 100 and the adjustment head 200 are assembled to form an assembly;

[0060] When the adjusting head 200 is mounted on the press, the pressing head body 100 can rotate relative to the adjusting head 200 on the press.

[0061] Among them, the length of the rod body 320 is greater than the length of the through hole. When the limit head 310 is completely sunk in the sinking groove 211, the lower end of the rod body 320 is exposed below the through hole. At the same time, the pressure head body 100 is connected to the threaded section 330, and the diameter of the rod body 320 is greater than the maximum diameter of the threaded end, so that the upper end surface of the pressure head body 100 will not exceed the lowermost end of the rod body 320, thereby leaving an anti-stuck gap a between the pressure head body 100 and the adjusting head 200. For details, refer to Figure 3 shown.

[0062] The thickness of the limiting head 310 is smaller than the depth of the sink 211 , and the difference is not less than the anti-stuck gap a.

[0063] Specific reference Figure 2 As shown, when the stopper 310 sinks to the bottom of the sinking groove, a sinking gap d is left between its upper end surface and the uppermost end of the sinking groove. The sinking gap d is the difference between the depth of the sinking groove 211 and the thickness of the stopper 310, and the difference is not less than the anti-stuck gap a.

[0064] Based on the above settings, when the ram body 100 is subjected to the supporting force of the sample 400, it will move upward, driving the connecting screw 300 to move together. When the end face of the ram body 100 contacts the lower end face of the adjusting head 200, it moves to the uppermost end. At this time, the moving height of the ram body 100 is the size of the anti-stuck gap a, which is smaller than the sinking gap d. Therefore, the limit head 310 will not extend outside the sinking groove 211, thereby avoiding contact between the limit head 310 and the press, and avoiding jamming.

[0065] In this embodiment, the gap between the pressing head body 100 and the adjusting head 200 is achieved by connecting the screw 300. The specific method is as follows: the length of the threaded hole in the pressing head body 100 is greater than the length of the threaded section 330.

[0066] When the connecting screw 300 is connected to the ram body 100 , the terminal connection position is when the screw section is completely inserted into the threaded hole of the ram body 100 . At this time, a gap-avoiding thread section 330 is left in the threaded hole.

[0067] To prevent the pressing head body 100 from getting stuck during the rotation process, in this embodiment, a first gap b is left between the groove wall of the sink 211 and the limiting head 310, and a second gap c is left between the inner wall of the through hole and the rod body 320;

[0068] The first gap b is not smaller than the second gap c.

[0069] Specific reference Figure 2 and Figure 3 As shown, the diameter of the sink 211 is larger than the diameter of the limit head 310, and the diameter of the through hole is larger than the diameter of the rod body 320;

[0070] When the ram body 100 rotates to adjust its position, the connecting screw 300 rotates in the adjusting head 200. By setting the first gap b and the second gap c, the friction between the connecting screw 300 and the adjusting head 200 is reduced, thereby avoiding the ram body 100 from getting stuck during rotation.

[0071] In this embodiment, a connection portion 210 with external threads is formed on the upper end surface of the regulating head 200 , and the sinking groove 211 is provided on the connection portion 210 .

[0072] The adjusting head 200 is threadedly connected to the press, which facilitates the replacement of the rotary press head tooling.

[0073] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A rotary indenter tool for bending resistance testing, characterized by: include, The indenter body (100) is provided with an upwardly concave V-shaped indentation groove (101) on its lower end surface, and both inclined surfaces of the V-shaped indentation groove (101) are in contact with the sample (400); The regulating head (200) is movably arranged at the upper end of the pressure head body (100), and the pressure head body (100) is capable of rotating at the lower end of the regulating head (200).

2. The rotary indenter tool for bending resistance test according to claim 1, characterized in that: The pressure head body (100) and the regulating head (200) are threadedly connected.

3. The rotary indenter tool for bending resistance test according to claim 1 or 2, characterized in that: An anti-stuck gap (a) is left between the upper end surface of the pressure head body (100) and the regulating head (200).

4. The rotary indenter tool for bending resistance test according to claim 3, characterized in that: It also includes a connecting screw (300), and the adjusting head (200) is provided with a through hole capable of accommodating the connecting screw (300) to pass through and allowing the connecting screw (300) to rotate. The lower end of the connecting screw (300) is threadedly connected to the pressing head body (100).

5. The rotary indenter tool for bending resistance test according to claim 4, characterized in that: The connecting screw (300) is sequentially arranged from top to bottom as a limit head (310), a rod body (320) and a threaded section (330); The regulating head (200) is provided with a sink (211) which cooperates with the limiting head (310).

6. The rotary indenter tool for bending resistance test according to claim 5, characterized in that: The thickness of the limiting head (310) is less than the depth of the sink (211), and the difference is not less than the anti-stuck gap (a).

7. The rotary indenter tool for bending resistance test according to claim 5, characterized in that: The length of the threaded hole in the press head body (100) is greater than the length of the threaded section (330).

8. The rotary indenter tool for bending resistance test according to claim 5, characterized in that: A first gap (b) is left between the groove wall of the sink groove (211) and the limiting head (310), and a second gap (c) is left between the inner wall of the through hole and the rod body (320); The first gap (b) is not smaller than the second gap (c).

9. The rotary indenter tool for bending resistance test according to claim 5, characterized in that: The length of the rod body (320) is greater than the length of the through hole.

10. The rotary indenter tool for bending resistance test according to claim 5, characterized in that: A connecting portion (210) with an external thread is formed on the upper end surface of the regulating head (200), and the sink (211) is provided on the connecting portion (210).

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