Auxiliary measuring tool for tensile test of fractured bar
By designing an auxiliary measuring fixture, and utilizing a combination of positioning blocks and adjustable clamps, the stability and accuracy issues of broken bar stock in traditional measuring methods were solved. This enabled precise positioning and stable clamping of the broken bar stock, thereby improving the accuracy of the measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FAGOR EDERLAN AUTO PARTS KUNSHAN CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional measurement methods cannot guarantee the stability of the fractured bar during the measurement process, and are prone to displacement and misalignment, resulting in measurement data deviations. Furthermore, it is difficult to ensure the fit of the fracture point.
An auxiliary measuring fixture was designed, including a support platform, a base, a positioning block, an adjustable clamp, and a driving structure. Through the combination of the positioning block's placement groove and the adjustable clamp, the broken bar stock can be accurately positioned and symmetrically clamped, ensuring the stability and accuracy of the bar stock during the measurement process.
It achieves precise positioning and stable clamping of broken bar stock, avoiding offset and misalignment during the measurement process, and improving the accuracy and consistency of the measurement.
Smart Images
Figure CN224262930U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tensile testing technology for fractured materials, specifically, it demonstrates an auxiliary measuring tool for tensile testing of fractured bars. Background Technology
[0002] In material tensile testing, accurate measurement and analysis of the fractured bar stock is a crucial step in obtaining data on the material's mechanical properties.
[0003] The traditional measurement method involves splicing the two broken bar sections together and measuring their length at the point of breakage using a measuring tool. The original breakage points of the original bar sections must be aligned during the splicing process. Without a clamping device, the roundness of the bar section during the fracture measurement cannot be guaranteed.
[0004] Currently, most methods employ simple clamps for temporary fixation. For example, Chinese patent publication number CN215524548U proposes a device for assisting in the measurement of fractured specimens in tensile tests. This device includes a slide rail, a fixed slider, an adjustable slider, a slider locking bolt, a locking block, a fixed ejector pin, and an adjustable ejector pin. The slide rail is used to adjust the slider spacing when measuring specimens of different lengths; the slider is used to limit the range of motion of the ejector pin; and the ejector pin is used to clamp the fractured tensile specimen to be tested. During the test, it is difficult to ensure the stability of the bar during the measurement process, as the bar is prone to displacement, leading to deviations in the measurement data. Furthermore, traditional clamps are difficult to ensure proper fit at the fracture points when clamping two sections of broken bar material, and are prone to clamping misalignment, further reducing the accuracy of the measurement. Utility Model Content
[0005] The purpose of this invention is to provide an auxiliary measuring fixture for tensile testing of broken bars, so as to at least solve the above-mentioned technical problems.
[0006] The technical solution is as follows:
[0007] An auxiliary measuring fixture for tensile testing of fractured bars, comprising:
[0008] The support platform provides the mounting surface;
[0009] There is a gap between the support and the mounting surface of the bearing platform;
[0010] The positioning block has a placement groove on its top surface along its length for laterally placing two broken bar sections. The positioning block is located in the middle of the top surface of the support.
[0011] The first clamp and the second clamp are positioned opposite each other along the length of the support, and the distance between the first clamp and the second clamp is adjustable to clamp the two sections of bar material on the positioning block from both sides.
[0012] The drive structure is located on the mounting surface of the support platform and adjusts the distance between the first clamp and the second clamp.
[0013] In addition, the above embodiments of this utility model may also have the following additional technical features:
[0014] According to one embodiment of this utility model, the first clamping body is positioned and connected to the mounting surface of the support platform, and the second clamping body is movably coupled to the support platform. The driving structure is a unidirectional drive, which drives the second clamping body to move closer to or further away from the first clamping body along the length direction of the support platform. With the fixed first clamping body as a reference, during clamping, the movement of the second clamping body is mainly relied on to push the broken bar material closer to one side of the first clamping body and finally achieve clamping. Clamping and releasing can be achieved by controlling the movement in a single direction.
[0015] According to another embodiment of this utility model, the first clamp and the second clamp are movably coupled to the support platform, and the driving structure is bidirectional to drive the first clamp and the second clamp to move towards each other along the length of the support platform. The two clamps move towards each other simultaneously, the clamping action is faster, and the clamping force is applied simultaneously and evenly from both sides of the bar stock to achieve the effect of symmetrical force application.
[0016] Based on the above technical solution, the positioning block is movably engaged on the support platform, and the central axis of the placement channel is perpendicular to the support platform. This allows for flexible assembly and disassembly of the positioning block while ensuring that the relative position between the positioning block and the support platform remains stable and does not shift during clamping.
[0017] The support platform is provided with a slot along its length, and the slot has a "V" shaped cross-section. The back of the positioning block is triangular to fit the slot. After the positioning block is placed in the slot, it automatically centers along its width, ensuring that the placement channel (and the broken bar material therein) on it is always on the center line of the support platform's length direction.
[0018] Furthermore, the angle of the cross-section of the slot is 45° to 120°. The preferred range of 45° to 120° achieves the best balance between the self-centering of the V-shaped slot and the stable constraint, ensuring that the positioning block is stably centered and not easily jammed or unstable.
[0019] According to one embodiment of this utility model, the placement channel is V-shaped. It provides automatic centering for the placed cylindrical bar stock and is also suitable for lateral placement of bars with different diameters, improving applicability.
[0020] According to one embodiment of this utility model, a rough layer is formed on the inner wall surfaces of both the first clamping body and the second clamping body. This increases the static friction between the first / second clamping body and the end face of the bar stock, ensuring a better clamping effect.
[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0022] 1. The design of the positioning block and its placement channel provides precise positioning and coaxial guidance for the placement of the bar stock, allowing the two broken bar stock sections to fit together naturally, avoiding misalignment of the two bar stock sections and reducing alignment time.
[0023] 2. Through the design of the adjustable distance first and second clamps, combined with the drive structure, controllable, axial, and symmetrical clamping force can be applied to the two broken bar sections from both sides, ensuring stable clamping of the bar and close contact of the fracture surfaces, preventing the bar from shifting or being misaligned during the measurement process.
[0024] 3. By designing the positioning block to be movable on the support, it is easy to replace positioning blocks of various specifications, thereby meeting the clamping requirements of bars of different diameters and shapes and improving the application range. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of an auxiliary measuring tool for tensile test fracture bars in Embodiment 1 of this utility model;
[0026] Figure 2 for Figure 1 Schematic diagrams related to the support and positioning blocks in the diagram;
[0027] Figure 3 This is a schematic diagram of the structure of an auxiliary measuring tool for tensile test fracture bars in Embodiment 2 of this utility model;
[0028] The relevant markings in the attached diagram are: 1-bearing platform, 2-support platform, 3-positioning block, 4-first clamping body, 5-second clamping body, 6-driving structure; 21-slot, 31-placement channel, 51-rough layer. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] Example 1:
[0031] Reference Figure 1 and Figure 2 As shown in the figure. This embodiment proposes an auxiliary measuring fixture for tensile test fracture bars, which mainly includes a bearing platform 1, a support 2, a positioning block 3, a first clamp 4, a second clamp 5, and a driving structure 6.
[0032] The support platform 1 is mainly used to provide a mounting surface with a horizontal reference plane for placing other components. It needs to have a certain structural strength, such as being made of alloy steel, to ensure the structural stability of the entire fixture. The support 2 is fixed on the support platform 1 along the length of the support platform 1 and forms a certain distance between it and the mounting surface of the support platform 1 to facilitate the installation of the drive structure 6 below. The support 2 and the support platform 1 are arranged in parallel.
[0033] Positioning block 3 is set in the middle of the top surface of support 2, and positioning block 3 extends in the same direction as support 2. A placement channel 31 is opened in the middle of the top surface of positioning block 3 along its length direction. The wall of placement channel 31 can fit the bar stock and is used to place two broken bar stock sections laterally. It provides a structurally specialized positioning station for the broken bar stock. The fracture surfaces of the two broken bar stock sections are close to each other and are both in the placement channel. The "length direction" of the placement channel naturally guides the two bar stock sections to be initially on the same straight line. This is the key basis for ensuring the subsequent alignment (coaxiality) of the fracture surfaces. The operator only needs to place the left and right broken bar stock sections in the placement channel in sequence, simplifying the placement process.
[0034] The first clamp 4 and the second clamp 5 are arranged opposite each other and are both arranged along the length of the support 2. The distance between the first clamp 4 and the second clamp 5 is adjustable, thus achieving the effect of clamping the two sections of bar material placed on the positioning block 3 from both sides. Moreover, the entire bar material is firmly and tightly attached to the inner wall of the placement channel, effectively preventing the bar material from rolling, shifting, or jumping during the measurement process. The drive structure 6 is set on the mounting surface of the support platform 1 and is located between the support platform 2 and the support platform 1. The drive structure 6 is used to adjust the distance between the first clamp 4 and the second clamp 5, so as to smoothly and accurately adjust the distance between the first clamp 4 and the second clamp 5, thereby providing precise and controllable clamping power, which is the key to avoiding clamping the bar material crookedly. The direction of the clamping force is consistent with the direction of the placement channel, forcing the two broken sections of bar material to fit and align strictly along the center line (coaxial reference) of the placement channel. The controllable opposing clamping force drives the two broken sections of bar material to tightly squeeze the fracture surface, so that they are in full contact, solving the problem of difficulty in fitting tightly when manually splicing.
[0035] In this embodiment, one of the first clamping body 4 and the second clamping body 5 is fixed on the support platform 1, while the other is movably mounted on the support platform 1. For example, the first clamping body 4 is positioned and connected to the mounting surface of the support platform 1, and the second clamping body 5 is movably coupled to the support platform 2. That is, the first clamping body 4 is located at the outer end of the support platform 2, and the second clamping body 5 can translate relative to the support platform 2 / support platform 1. It is worth noting that the effective clamping surfaces (the parts that contact the side end face of the bar stock) of the first clamping body 4 and the second clamping body 5 are higher than the positioning block 3, and the displacement of the first clamping body 4 and the second clamping body 5 is not affected by the support platform 2. That is, a slot for the support platform 2 to accommodate is opened in the middle of the first clamping body 4 and the second clamping body 5. The drive structure 6 in this solution is a unidirectional drive, such as a unidirectional screw module, cylinder, or other conventional drive design, used to drive the second clamping body 5 to move closer to or further away from the first clamping body 4 along the length direction of the support platform 2.
[0036] Using the fixed first clamp as a reference, the clamping process mainly relies on the movement of the second clamp to push the broken bar material closer to the first clamp and finally achieve clamping. Clamping and loosening can be achieved by controlling the movement in one direction. The operation is also direct, and clamping and loosening can be achieved by controlling the movement in one direction.
[0037] Based on the above solution, in this embodiment, the positioning block 3 is movably clamped on the support 2, that is, the positioning block 3 and the support 2 are flexibly assembled. This allows for flexible disassembly and replacement of the positioning block, thus improving the application range. It is worth noting that the central axis of the groove 31 on the positioning block 3 is always perpendicular to the top surface of the support 2, ensuring that the relative position between the positioning block and the support is stable and does not shift during the clamping process, and that the bar stock is placed stably.
[0038] In detail, the support 2 is provided with a slot 21 along its length. The cross-sectional shape of the slot 21 is "V". The back of the positioning block 3 is designed in a triangular shape to fit into the slot 21. That is, the back of the positioning block 3 can be smoothly locked in the slot 21. Only axial sliding occurs between the two. The V-shaped fit also restricts the positioning block to move only in the length direction, ensuring that the positioning block will not be skewed during clamping. After the positioning block is placed in the slot, it can automatically center along the width direction, ensuring that the placement channel (and the broken bar material in it) on it is always on the center line of the length direction of the support. The contact of the V-shaped surface provides more reliable constraint than the flat bottom, preventing the positioning block from shaking, twisting or lateral movement during clamping or in case of accidents, ensuring the rigidity of the core positioning station. The positioning block can be designed in various sizes according to different specifications of bar material. The appropriate positioning block can be replaced according to the actual testing requirements. The positioning block can also be adapted to the slot on the support, realizing rapid assembly.
[0039] In specific implementation, the angle range of the cross section of the slot 21 can be designed to be 45° to 120°. The preferred range achieves the best balance between the self-centering of the V-shaped slot and the stable constraint, ensuring that the positioning block is stably centered and not easily jammed or unstable. Too large or too small an angle is not conducive to the placement and locking of the positioning block.
[0040] It should be noted that the placement groove 31 on the positioning block 3 can be designed in a "V" shape, or it can be a semi-circular arc shape. The V-shaped design can automatically center the placed cylindrical bar stock, and can adapt to bars of different diameters within a certain range. Regardless of whether the bar stock diameter is slightly different (within the allowable range of groove depth), it can ensure that the axis of the bar stock falls on the symmetry line of the V-shaped groove (i.e., consistent with the clamping direction). Moreover, the two inclined surfaces can form a stable support point for the bar stock, which can prevent the bar stock from rolling accidentally before or during clamping. Theoretically, it also reduces the contact area (local contact) with the bar stock, reduces stress deformation caused by positioning, and is more conducive to the intuitive observation of the fracture surface during subsequent testing.
[0041] Furthermore, the inner walls of both the first clamping body 4 and the second clamping body 5 are formed with a rough layer 51. The rough layer can be a dense protrusion design or a non-smooth surface design after grinding. This ensures that, even when subjected to a small external force or when a measuring force needs to be applied during the measurement process, the bar stock will not slide axially or in the direction of rotation at the clamping point when it is clamped, thus achieving a more stable clamping effect. The increased friction helps to resist the torque that may cause the two sections of bar stock to rotate relative to each other at the clamping contact surface, further reducing the possibility of "clamping out of alignment".
[0042] The usage process of the auxiliary measuring fixture provided in this embodiment is as follows:
[0043] ① When the tensile test requires measuring the broken bar stock, first select a suitable replaceable positioning block according to the diameter and shape of the bar stock and place it in the V-shaped slot on the support.
[0044] ② Place the outer end of the first broken bar close to the inner wall of the first clamp, and place the broken side of the bar in the placement groove on the positioning block. Place the second bar in the same way, and make the broken surfaces of the two bars face each other, so that the broken parts of the bars can be in the same axis under the action of the positioning block.
[0045] ③ The drive structure begins to work slowly, pushing the second bar section toward the first bar section. During this process, observe whether the bar section remains upright. If there is a slight deviation, the position of the bar section can be finely adjusted until the fracture surfaces of the two bar sections come into contact and fit together, gradually clamping the bar section.
[0046] ④ Use measuring instruments to measure various parameters of the clamped bar stock, and closely observe whether the bar stock is loose during the measurement process.
[0047] ⑤ After the measurement is completed, reverse the control drive structure to release the second clamp, take out the two sections of bar material that have been measured, clean the tooling, and prepare for the next measurement.
[0048] Example 2:
[0049] The difference from the above embodiment 1 lies in the design of the first clamp and the second clamp.
[0050] Reference Figure 3 As shown, in this embodiment, the first clamp 4 and the second clamp 5 are movably coupled to the support 2, that is, the first clamp 4 and the second clamp 5 can both translate relative to the support platform 1 / support 2. Based on this design, the drive structure 6 adopts bidirectional drive, such as a conventional bidirectional screw module. The first clamp 4 and the second clamp 5 are respectively set on the two drive ends of the drive structure 6. Similarly, the effective clamping surface (the part in contact with the side end face of the bar) of the first clamp 4 and the second clamp 5 is higher than the positioning block 3, and the displacement of the first clamp 4 and the second clamp 5 is not affected by the support 2. That is, the middle part of the first clamp 4 and the second clamp 5 needs to be opened for the support to accommodate. In this way, the drive structure 6 realizes the opposite movement of the first clamp 4 and the second clamp 5 along the length direction of the support 2. The two clamps move towards each other at the same time, clamping the middle bar on both sides. The clamping action is faster, and the clamping force is applied simultaneously and evenly from both sides of the bar to achieve the effect of symmetrical force application.
[0051] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0052] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through the specific circumstances.
[0053] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.
Claims
1. An auxiliary measuring fixture for tensile fracture bars, characterized in that, include: The support platform (1) provides the mounting surface; There is a gap between the support (2) and the mounting surface of the bearing platform (1); The positioning block (3) has a placement channel (31) along its length on its top surface for placing two broken bars laterally. The positioning block (3) is located in the middle of the top surface of the support (2). A first clamp (4) and a second clamp (5) are positioned opposite each other along the length of the support (2), and the distance between the first clamp (4) and the second clamp (5) is adjustable to clamp the two sections of bar material on the positioning block (3) from both sides. The drive structure (6) is located on the mounting surface of the support platform (1) and adjusts the distance between the first clamp (4) and the second clamp (5).
2. The auxiliary measuring fixture for tensile fracture bars according to claim 1, characterized in that, The first clamp (4) is positioned and connected to the mounting surface of the support platform (1), and the second clamp (5) is movably coupled to the support platform (2). The driving structure (6) is a unidirectional drive to drive the second clamp (5) to move closer to or further away from the first clamp (4) along the length direction of the support platform (2).
3. The auxiliary measuring fixture for tensile fracture bars according to claim 1, characterized in that, The first clamp (4) and the second clamp (5) are movably coupled to the support (2), and the driving structure (6) is bidirectional to drive the first clamp (4) and the second clamp (5) to move towards each other along the length of the support (2).
4. An auxiliary measuring fixture for tensile fracture bars according to claim 2 or 3, characterized in that, The positioning block (3) is movably engaged on the support (2), and the central axis of the placement channel (31) is perpendicular to the support (2).
5. The auxiliary measuring fixture for tensile fracture bars according to claim 4, characterized in that, The support (2) is provided with a slot (21) along its length direction. The cross-sectional shape of the slot (21) is "V". The back of the positioning block (3) is triangular to fit the slot (21).
6. The auxiliary measuring fixture for tensile fracture bars according to claim 5, characterized in that, The angle of the cross section of the slot (21) is 45° to 120°.
7. The auxiliary measuring fixture for tensile fracture bars according to claim 1, characterized in that, The placement channel (31) is V-shaped.
8. The auxiliary measuring fixture for tensile test fracture bars according to claim 1, characterized in that, The inner walls of the first clamp (4) and the second clamp (5) are both formed with a rough layer (51).