A bending test device for dissimilar steels

Abstract

This utility model relates to the field of physical and chemical testing technology, specifically to a bending test device for dissimilar steels, comprising: a pressure head, the bottom of which forms a pressure end for contacting the upper end of the test plate, the pressure end being used to apply a bending force to the center of the test plate along its length; the device further comprises: a stop member; and a fixing assembly for detachably installing the stop member at the lower end of the pressure end. This utility model, by installing a stop member at the bottom of the existing pressure head, can pre-position the test plate using the stop member and the pressure head. When the test plate is deformed under pressure, the stop member generates a horizontal force on the test plate to prevent the test plate from shifting along its length, maintaining the center of the test plate's length on the same extension line as the pressure end of the pressure head, ensuring that the test plate is bent into a U-shape, meeting the test standards.

Description

Technical Field

[0001] This utility model relates to the field of physical and chemical testing technology, and in particular to a bending test device for dissimilar steels. Background Technology

[0002] One test in physicochemical testing is the roller bending test. A rectangular sample is placed flat on two support seats with rollers. These samples can be made of raw material or welded. When performing a bending test on a welded sample, the welded part is located at the center of the two rollers. The upper pressure head is then aligned with the welded position. After the equipment is started, the rollers move upwards, causing the rectangular sample to bend 180 degrees around the upper pressure head. The upper pressure head remains stationary throughout the process. The test stops after bending to the specified 180-degree angle, and the sample is removed to check for defects on its outer surface. (Refer to the attached diagram.) Figure 4 The rectangular part in the middle is the sample, and the black part in the middle of the sample is the welding point.

[0003] The current technical problem is that when the materials on both sides of the sample are the same, there is no problem in forming a U-shaped structure after bending 180 degrees. However, when the materials on both sides are different, for example, the strength of the material on one side of the sample is significantly higher than that on the other side, the deformation on both sides will be different when subjected to the same bending force. That is, the deformation of the material with greater strength is less than that of the material with less strength. This causes the sample to slip and deform to one side at the beginning of the test, causing the center of the sample's length to deviate from the initial position. The force position of the sample changes, resulting in a bending deviation. Ultimately, the sample is bent into a J-shape instead of the expected U-shape, thus affecting the test results.

[0004] To address this technical problem, we have developed a tooling that ensures the bent specimen does not bend off-center while meeting the test standards. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a bending test device for dissimilar steels, so as to solve the technical problem that the existing bending test devices are prone to bending deviation when conducting bending tests on samples of two different materials.

[0006] To achieve the above objectives, this utility model provides a bending test device for dissimilar steels, comprising:

[0007] The pressure head has a bottom forming a pressure end for contacting the upper end of the test plate, the pressure end being used to apply a bending force to the center of the test plate along its length;

[0008] The device further includes:

[0009] Stopping components;

[0010] A fixing assembly is provided for detachably mounting the stop member at the lower end of the pressure end, such that the upper end of the stop member forms a support surface for supporting the bottom of the test plate, the support surface and the pressure end being spaced apart to form a gap for inserting the test plate, and when the test plate is deformed under pressure, the stop member generates a horizontal force on the test plate to prevent the test plate from shifting along its length.

[0011] As a preferred embodiment of this utility model, the fixing component includes:

[0012] The bracket has two supports that are disposed opposite each other on both sides of the pressure head. The surface of the support is provided with a first threaded hole, and both ends of the stop member are provided with a second threaded hole at the corresponding first threaded hole.

[0013] A first bolt passes through a first threaded hole and a second threaded hole in sequence to fix the stop to the lower end of the bracket.

[0014] As a preferred embodiment of this utility model, the bracket has bolt holes on its side, the pressure head has an internal thread groove corresponding to the bolt holes on its side, and a second bolt is provided between the bolt holes and the internal thread groove.

[0015] As a preferred embodiment of this utility model, the pressure head includes pressure rollers with interconnected connecting heads.

[0016] As a preferred embodiment of this utility model, the bracket has an L-shaped structure.

[0017] As a preferred embodiment of this utility model, the stop member is a plate-shaped structure to form a support surface that contacts the test plate surface.

[0018] As a preferred embodiment of this utility model, each bracket is provided with at least two bolt holes, and correspondingly, each bracket is fixed to the pressure head by at least two second bolts.

[0019] As a preferred embodiment of this utility model, the upper end of the connector is provided with an internal threaded hole, a threaded rod is provided in the internal threaded hole, and a snap-fit ​​connector is provided at the upper end of the threaded rod. The snap-fit ​​connector is used to connect with the chuck clamp of the testing equipment.

[0020] The beneficial effects of this utility model are as follows: By installing a stopper at the bottom of the existing indenter, this utility model can pre-position the sample plate using the stopper and the indenter. When the test plate is deformed under pressure, the stopper generates a horizontal force on the test plate to prevent the test plate from shifting along the length direction, maintaining the length center of the sample plate and the pressure end of the indenter on the same extension line, ensuring that the sample plate is bent into a U-shape to meet the test detection standards. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0023] Figure 2 This is a side view of the structure of this utility model;

[0024] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 4 This is a schematic diagram illustrating the principle and structure of the bending test.

[0026] The following are marked in the diagram: 1. Connector; 2. Pressure roller; 3. Bracket; 4. Stop; 5. First bolt; 6. Second bolt. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] like Figure 1 , Figure 2 and Figure 3As shown, a bending test device for dissimilar steel includes: a pressure head with a bottom forming a pressure end for contacting the upper end of a test plate, the pressure end being used to apply a bending force to the center of the test plate along its length; the device also includes: a stop 4; a fixing assembly for detachably installing the stop 4 at the lower end of the pressure end, such that the upper end of the stop 4 forms a support surface for supporting the bottom of the test plate, the support surface and the pressure end being spaced apart to form a gap for inserting the test plate, and when the test plate is deformed under pressure, the stop 4 generates a horizontal force on the test plate to prevent the test plate from shifting along its length;

[0030] The above technical solution can effectively prevent the sample plate from bending during the test. In use, the sample plate is first inserted into the gap formed between the stop 4 and the pressure head, ensuring that the length center of the sample plate, the pressure end, and the span center of the two support rollers are on the same extended line. The equipment is started, and the support rollers move upward and release the two ends of the sample plate, so that the two ends of the sample plate bend around the upper pressure head at a 180-degree angle. During this process, the material strength on both sides of the sample is inconsistent, which will cause horizontal slippage. However, because the stop 4 is provided, the stop 4 can prevent the slippage when the sample plate bends, and keep the length center of the sample plate, the pressure end, and the span center of the two support rollers on the same extended line as much as possible, so that the sample plate is bent into a U-shape. After the test, the stop 4 can be removed by removing the fixing components, and the sample plate can be taken off.

[0031] like Figure 3 As shown, in this embodiment, the fixing component includes: a bracket 3, which has two and is disposed opposite to each other on both sides of the pressure head; a first threaded hole is opened on the surface of the bracket 3; and a second threaded hole is opened at both ends of the stop member 4 at the corresponding first threaded hole; and a first bolt 5, which passes through the first threaded hole and the second threaded hole in sequence to fix the stop member 4 to the lower end of the bracket 3.

[0032] The above technical solution allows the stop 4 to be detachably fixed to the lower end of the bracket 3 through the cooperation of the bracket 3 and the first bolt 5.

[0033] like Figure 2 and Figure 3 As shown, in this embodiment, bolt holes are provided on the side of the bracket 3, and the pressure head is provided with an internal thread groove corresponding to the bolt holes on its side. A second bolt 6 is provided between the bolt holes and the internal thread groove. Preferably, the bracket 3 is an L-shaped structure, and each bracket 3 is provided with at least two bolt holes. Accordingly, each bracket 3 is fixed to the pressure head by at least two second bolts 6.

[0034] The above technical solution can effectively improve the bonding strength between the support 3 and the pressure head, and prevent the support 3 from falling off the pressure head due to external force.

[0035] like Figure 1 and Figure 3 As shown, in this embodiment, the pressure head includes pressure rollers 2 connected to each other by a connecting head 1;

[0036] The above technical solution enables the modular design of the pressure head. Since the pressure roller 2 needs to act on the sample plate for a long time, the pressure roller 2 becomes the most easily damaged part. When the pressure roller 2 is damaged, only the pressure roller 2 needs to be replaced, thus retaining the connector 1. This part of the technical content is the prior art and is well known to those skilled in the art, so it will not be described in detail here.

[0037] like Figure 1 and Figure 3 As shown, in this embodiment, the stop 4 is a plate-like structure to form a support surface that contacts the surface of the test plate.

[0038] The above technical solution can ensure that the stop 4 can stably support the sample plate.

[0039] like Figure 3 As shown, in this embodiment, the upper end of the connector 1 is provided with an internal threaded hole, a threaded rod is provided in the internal threaded hole, and a snap-fit ​​connector is provided at the upper end of the threaded rod. The snap-fit ​​connector is used to connect with the chuck clamp of the test equipment.

[0040] The above technical solution allows the pressure head to be easily installed in the corresponding position on the test equipment in a detachable manner. This part of the technical content is existing technology and is well known to those skilled in the art, so it will not be described in detail here.

[0041] Working principle: When in use, first insert the sample plate into the gap formed between the stop 4 and the pressure head, ensuring that the length center of the sample plate, the pressure end, and the span center of the two support rollers are on the same extension line. Start the equipment, and the support rollers will move upward and release the two ends of the sample plate, so that the two ends of the sample plate bend and deform around the upper pressure head at a 180-degree angle.

[0042] During this process, the material strength on both sides of the sample is inconsistent, which will cause horizontal slippage. However, due to the presence of a stop 4, the stop 4 can prevent the sample plate from slipping when it is bent, thus keeping the length center of the sample plate, the pressure end, and the span center of the two support rollers on the same extended line as much as possible, so that the sample plate is bent into a U-shape.

[0043] After the test, the first bolt 5 is removed from the bracket 3 and the stop 4, which makes it easy to remove the stop 4 from the bracket 3, thereby releasing the restriction on the sample assembly and making it easy to remove the bent sample plate.

[0044] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0045] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bending test apparatus for dissimilar steels, comprising: The pressure head has a bottom forming a pressure end for contacting the upper end of the test plate, the pressure end being used to apply a bending force to the center of the test plate along its length; The device is characterized in that it further includes: Stop (4); A fixing component is used to detachably install the stop (4) at the lower end of the pressure end, such that the upper end of the stop (4) forms a support surface for supporting the bottom of the test plate, the support surface and the pressure end are spaced apart to form a gap for inserting the test plate, and when the test plate is deformed under pressure, the stop (4) generates a horizontal force on the test plate to prevent the test plate from shifting along the length direction.

2. The dissimilar steel bending test apparatus according to claim 1, characterized in that, The fixing component includes: The bracket (3) has two and is disposed opposite to each other on both sides of the pressure head. The surface of the bracket (3) is provided with a first threaded hole, and the two ends of the stop member (4) are provided with a second threaded hole at the corresponding first threaded hole. The first bolt (5) passes through the first threaded hole and the second threaded hole in sequence to fix the stop (4) to the lower end of the bracket (3).

3. The dissimilar steel bend test apparatus of claim 2, wherein, The bracket (3) has bolt holes on its side, and the pressure head has an internal thread groove corresponding to the bolt holes on its side. A second bolt (6) is provided between the bolt holes and the internal thread groove.

4. The dissimilar steel bend test apparatus of claim 1, wherein, The pressure head includes pressure rollers (2) with interconnected connectors (1).

5. The dissimilar steel bend test apparatus of claim 3, wherein, The bracket (3) has an L-shaped structure.

6. The dissimilar steel bend test apparatus of claim 1, wherein, The stop (4) is a plate-shaped structure to form a support surface that contacts the test plate surface.

7. The dissimilar steel bend test apparatus of claim 5, wherein, Each of the brackets (3) has at least two bolt holes, and correspondingly, each of the brackets (3) is fixed to the pressure head by at least two second bolts (6).

8. The dissimilar steel bend test apparatus of claim 4, wherein, The upper end of the connector (1) is provided with an internal threaded hole, a threaded rod is provided in the internal threaded hole, and a clamping head is provided at the upper end of the threaded rod. The clamping head is used to connect with the chuck clamp of the test equipment.

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