Fixing device for impact sample notch machining and broaching machine

Abstract

The utility model relates to a fixing device for impact sample notch machining and a broaching machine. The fixing device comprises a base, a tensioning piece and a tensioning mechanism. Wherein two positioning baffles are arranged at the front end of the base at intervals; the tensioning piece is arranged between the two positioning baffles and is of a U-shaped structure, a placement groove is formed in the top of the tensioning piece, and a sample is placed in the placement groove; the tensioning mechanism is arranged at the rear end of the base, the tensioning piece is connected to the tensioning mechanism, and the tensioning mechanism is used for driving the tensioning piece to move in the front-back direction of the base; when the tensioning mechanism pulls the tensioning piece, the front groove wall of the placing groove can make the sample abut against the front end faces of the two positioning baffles. The tensioning mechanism drives the tensioning piece to move, the sample can abut against the front end face of the positioning baffle arranged on the base, and the front end face of the positioning baffle serves as a positioning reference, so that the width size of a ligament cannot be out of tolerance after the notch of the impact sample is machined, and the machining precision of the impact sample is improved.

Description

Technical Field

[0001] This utility model relates to the field of sample processing equipment technology, and more specifically, to a fixing device and broaching machine for processing notches in impact samples. Background Technology

[0002] In the field of impact toughness testing of metallic materials, the precision of notching the standard specimen directly affects the accuracy of the material's mechanical property test results. Currently, most commonly used impact specimen notching broaching machines employ a mechanical clamping structure for specimen fixing. The specimen is clamped and positioned using clamping bolts, and then a fixed broach on the impact specimen notching broach machine is used to machine a V-shaped or U-shaped notch on the side of the specimen, which is clamped against a baffle. This device ensures the notch depth by fixing the broach feed stroke (typically 5mm or 2mm) and maintains the ligament width (typically 8mm or 5mm) machining accuracy by relying on the specimen's outer dimensions for positioning.

[0003] However, existing mechanical clamping specimen fixing devices have the following drawbacks: when the width dimensional tolerance of the specimen to be processed is large, since the specimen fixing relies entirely on the outer contour positioning, the actual processed specimen's ligament width dimension will exceed the tolerance. This instability in processing accuracy will lead to increased dispersion in impact test data, seriously affecting the accurate evaluation of material properties. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a fixing device and broaching machine for notching impact test specimens, in order to solve the problems existing in the prior art.

[0005] According to a first aspect of this utility model, a fixing device for notching impact test specimens is provided, comprising a base, a tensioning member, and a tensioning mechanism; wherein...

[0006] The base has two positioning baffles spaced apart at its front end;

[0007] The tensioning member is disposed between the two positioning baffles. The tensioning member has a U-shaped structure and a placement groove is provided on the top of the tensioning member for placing the sample.

[0008] The tensioning mechanism is located at the rear end of the base, and the tensioning member is connected to the tensioning mechanism. The tensioning mechanism is used to drive the tensioning member to move along the front-back direction of the base.

[0009] When the tensioning mechanism pulls the tensioning member, the front wall of the placement groove can bring the sample against the front end face of the two positioning baffles.

[0010] Preferably, the front end of the base is further provided with a placement platform for placing the sample, and the two positioning baffles are located on the rear side of the placement platform.

[0011] Preferably, a positioning block is provided on one side of the placement platform, and the positioning block is detachably connected to the placement platform.

[0012] Preferably, the placement platform has a forward-facing groove in the middle, and the groove extends vertically through the placement platform.

[0013] Preferably, the placement platform is further provided with two upward-facing sliding grooves, which extend through the placement platform along the front-rear direction of the base, and the front end of the tensioning member is slidably disposed in the two sliding grooves.

[0014] Preferably, a middle baffle is provided between the two positioning baffles, and the width of the middle baffle is consistent with the width of the U-shaped opening of the tensioning member.

[0015] Preferably, the tensioning mechanism includes a fixed base, a rotating shaft, a turntable, and a drive rod;

[0016] The fixing seat is disposed on the base, and the fixing seat has a through mounting hole.

[0017] The front end of the rotating shaft is provided with an external thread, the front end of the rotating shaft is inserted into the mounting hole, the middle part of the rotating shaft is rotatably connected to the rear end of the fixed base, and the turntable is fixedly connected to the rear end of the rotating shaft.

[0018] The drive rod is slidably disposed in the mounting hole, and the drive rod has an internal thread hole that matches the external thread at the front end of the rotating shaft. The drive rod is threadedly connected to the front end of the drive rod.

[0019] The front end of the drive rod extends out of the front end of the mounting hole, and the tensioning member is connected to the front end of the drive rod.

[0020] Preferably, a rotating plate is provided in the middle of the rotating shaft, and a circular groove for accommodating the rotating plate is provided at the rear end of the fixed seat. The rotating plate is rotatably disposed in the circular groove, and a fixed sealing plate is detachably connected to the outer side of the circular groove.

[0021] Preferably, the rear end of the tensioning member is provided with a mounting groove, and the front end of the drive rod is provided with an upper fork plate and a lower fork plate. The upper fork plate and the lower fork plate are respectively located at the top of the rear end of the tensioning member and in the mounting groove. The upper fork plate and the lower fork plate are connected to the rear end of the tensioning member by bolts.

[0022] According to a second aspect of the present invention, a broaching machine for notching impact test specimens is provided, comprising the fixing device for notching impact test specimens as described above.

[0023] The present invention provides a fixing device and broaching machine for notching impact test specimens. The fixing device is equipped with a tensioning mechanism and a tensioning component. The tensioning mechanism drives the tensioning component to move, so that the specimen can be pressed against the front end face of the positioning baffle set on the base. The front end face of the positioning baffle is used as the positioning reference, so that the ligament width dimension after notching impact test specimens will not exceed the tolerance, thereby improving the processing accuracy of impact test specimens. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings.

[0025] Figure 1 A three-dimensional structural schematic diagram of a fixing device for notching impact test specimens according to an embodiment of the present invention is shown.

[0026] Figure 2 An exploded structural diagram of a fixing device for notching impact test specimens according to an embodiment of the present invention is shown.

[0027] Figure 3 A partial structural cross-sectional view of the tensioning mechanism in the fixing device for notching impact specimens according to an embodiment of the present invention is shown.

[0028] Figure 4 A three-dimensional structural schematic diagram of the base in the fixing device for notching impact specimens according to an embodiment of the present invention is shown.

[0029] Figure 5 A top view of the base in the fixing device for notching impact test specimens according to an embodiment of the present invention is shown.

[0030] Figure 6 A three-dimensional structural schematic diagram of the tensioning member in the fixing device for notching impact specimens according to an embodiment of the present invention is shown.

[0031] Figure 7 A three-dimensional structural schematic diagram of a broaching machine for notching impact specimens according to an embodiment of the present invention is shown.

[0032] In the diagram: 1. Base; 11. Positioning baffle; 12. Placement platform; 13. Positioning block; 14. Groove; 15. Slide groove; 16. Middle baffle; 2. Tensioner; 21. Placement groove; 22. Mounting groove; 3. Tensioning mechanism; 31. Fixed seat; 311. Mounting hole; 312. Circular groove; 313. Fixed sealing plate; 32. Rotating shaft; 321. Rotating plate; 33. Turntable; 34. Drive rod; 341. Internal threaded hole; 342. Upper fork plate; 343. Lower fork plate; 35. Flat key; 4. Sample; 01. Fixing device for notching impact sample; 02. Broaching machine for notching impact sample. Detailed Implementation

[0033] Various embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0034] This utility model provides a fixing device for notching impact test specimens, see [link]. Figure 1 and Figure 2 The fixing device for notching impact test specimens includes a base 1, a tensioning member 2, and a tensioning mechanism 3. The base 1 has two positioning baffles 11 spaced apart at its front end. The tensioning member 2 is located between the two positioning baffles 11 and has a U-shaped structure. A placement groove 21 is formed on the top of the tensioning member 2, in which a test specimen 4 is placed. The tensioning mechanism 3 is located at the rear end of the base 1, and the tensioning member 2 is connected to the tensioning mechanism 3. The tensioning mechanism 3 drives the tensioning member 2 to move along the front-rear direction of the base 1. When the tensioning mechanism 3 pulls the tensioning member 2, the front wall of the placement groove 21 can abut the test specimen 4 against the front end faces of the two positioning baffles 11.

[0035] Specifically, the base 1 is provided with multiple bolt holes, and the base 1 is fixedly mounted on the worktable of the broaching machine by multiple bolts, with the front end of the base 1 facing the broach of the broaching machine. The center position of the base 1 in the width direction corresponds to the position of the broach. The tensioning mechanism 3 and the tensioning member 2 are both located at the center position in the width direction of the base 1, so that when the tensioning member 2 tensions and fixes the sample, the sample can be located at the middle position of the front end of the base 1, allowing the broaching machine to align with the middle position of the sample for machining the notch. The width of the placement groove 21 on the tensioning member 2 is greater than the width of the sample. Before placing the sample to be processed, the tensioning mechanism 3 drives the tensioning member 2 to move towards the front end of the base 1, so that the placement groove 21 on the tensioning member 2 moves to the front side of the two positioning baffles 11. After the sample is placed in the placement groove 21, the tensioning mechanism 3 drives the tensioning member 2 to move towards the rear end of the base 1. The front groove wall of the placement groove 21 (the groove wall away from the tensioning mechanism 3) will press the sample against the front end face of the two positioning baffles 11. When the sample is notched, the front end face of the two positioning baffles 11 will be used as the positioning reference. Even if there is a large processing deviation in the width direction of the sample, it will still be ensured that the ligament width of the sample is within the tolerance range after the sample is notched, and there will be no deviation. This ensures the processing accuracy of the impact sample and ensures the accuracy of the material impact test results.

[0036] See Figure 4 and Figure 5The base 1 also has a placement platform 12 for placing the sample at its front end, and the two positioning baffles 11 are located on the rear side of the placement platform 12. Specifically, the bottom of the tensioning member 2 is located on the top surface of the base 1. The distance between the bottom wall of the placement groove 21 on the tensioning member 2 and the bottom surface of the tensioning member 2 is less than or equal to the distance between the top surface of the placement platform 12 and the top surface of the base 1, so that after the sample is placed in the placement groove 21 of the tensioning member 2, both ends of the sample can be supported on the placement platform 12. In this embodiment, the distance between the bottom wall of the placement groove 21 and the bottom surface of the tensioning member 2 is equal to the distance between the top surface of the placement platform 12 and the top surface of the base 1, so that the bottom wall of the placement groove 21 of the tensioning member 2 is on the same plane as the placement platform 12, and after the sample is placed in the placement groove 21, the sample can be supported on both the bottom wall of the placement groove 21 and the placement platform 12.

[0037] To enable rapid sample positioning during sample placement, a positioning block 13 is provided on one side of the placement platform 12, and the positioning block 13 is detachably connected to the placement platform 12. In this embodiment, a threaded hole is provided on one side of the placement platform 12, and a bolt through hole is provided on the positioning block 13. The positioning block 13 is fixedly connected to the placement platform 12 by screws. Since the positioning block 13 is detachably connected to the placement platform 12, positioning blocks 13 of different lengths can be replaced when it is necessary to position samples of different lengths. When positioning the sample using the positioning block 13, one side of the sample in the width direction abuts against the front end face of the two positioning baffles 11, and one end of the sample in the length direction abuts against the positioning block 13, thereby positioning the middle position of the sample at the middle position in the width direction of the base 1. During notch machining, the broach of the broaching machine is aligned with the middle position of the sample to broach and machine the notch.

[0038] Furthermore, a forward-opening groove 14 is provided in the middle of the placement table 12, and the groove 14 extends vertically through the placement table 12. By providing a forward-opening groove 14 on the placement table 12, it can be ensured that when the broach is feeding to process the notch of the sample, the broach will not touch the placement table 12, and only the sample will be processed.

[0039] Furthermore, the placement platform 12 is also provided with two upward-facing sliding grooves 15, such as... Figure 5 As shown, two sliding grooves 15 are symmetrically arranged on both sides of the groove 14. The sliding grooves 15 extend through the placement platform 12 along the front-back direction of the base 1. The front end of the tensioning member 2 is slidably disposed in the two sliding grooves 15. The bottom wall of the sliding groove 15 is flush with the top wall of the base 1. The front end of the U-shaped tensioning member 2 is slidably disposed in the two sliding grooves 15.

[0040] Furthermore, a central baffle 16 is provided between the two positioning baffles 11, the width of which is consistent with the width of the U-shaped opening of the tensioning member 2. The central baffle 16 can block and limit the middle position of the sample, preventing the middle of the sample from bending and deforming during the notch processing, thus affecting the accuracy of the sample after processing. In this embodiment, the positioning baffles 11, the placement platform 12, and the central baffle 16 are all integrally formed with the base 1.

[0041] See Figure 2 and Figure 3 The tensioning mechanism 3 includes a fixed base 31, a rotating shaft 32, a turntable 33, and a drive rod 34. The fixed base 31 is mounted on the base 1, and its interior has a through mounting hole 311. The rotating shaft 32 has an external thread at its front end, which is inserted into the mounting hole 311. The middle part of the rotating shaft 32 is rotatably connected to the rear end of the fixed base 31, and the turntable 33 is fixedly connected to the rear end of the rotating shaft 32. The drive rod 34 is slidably disposed in the mounting hole 311, and has an internal threaded hole 341 that matches the external thread at the front end of the rotating shaft 32. The drive rod 34 is threadedly connected to its front end. The front end of the drive rod 34 extends out of the mounting hole 311, and the tensioning member 2 is connected to the front end of the drive rod 34.

[0042] Specifically, a rotating plate 321 is provided in the middle of the rotating shaft 32, and a circular groove 312 for accommodating the rotating plate 321 is provided at the rear end of the fixed base 31. The rotating plate 321 is rotatably disposed in the circular groove 312, and a fixed sealing plate 313 is detachably connected to the outer side of the circular groove 312. The fixed sealing plate 313 has a central hole that matches the rotating shaft 32. The fixed sealing plate 313 is sleeved onto the rotating shaft 32 from the rear end, thus enclosing the rotating plate 321 in the circular groove 312 at the rear end of the fixed base 31. The turntable 33 is fixedly connected to the rear end of the rotating shaft 32 by bolts, allowing the operator to rotate the rotating shaft 32 by rotating the turntable 33. The rotation of the rotating shaft 32 causes the drive rod 34 to move back and forth, thereby moving the tensioning member 2 connected to the front end of the drive rod 34. In this embodiment, the fixing base 31 and the base 1 are an integral structure. The mounting hole 311 in the fixing base 31 is a circular hole, and the driving rod 34 is a circular rod that matches the mounting hole 311. To prevent the driving rod 34 from rotating, keyways are provided on the mounting hole 311 and the driving rod 34, respectively. A flat key 35 is provided between the keyway of the driving rod 34 and the keyway of the mounting hole 311, thereby preventing the circular driving rod 34 from rotating circumferentially. In other alternative embodiments, the mounting hole 311 can be set as a square hole or a rectangular hole, and the driving rod 34 can be set as a square rod or a rectangular rod that matches the mounting hole 311, thus eliminating the need for a flat key 35 to ensure that the driving rod 34 does not rotate circumferentially.

[0043] Furthermore, such as Figure 6 As shown, the rear end of the tensioning member 2 is provided with a mounting groove 22, and the front end of the drive rod 34 is provided with an upper fork plate 342 and a lower fork plate 343. The upper fork plate 342 and the lower fork plate 343 are respectively located at the top of the rear end of the tensioning member 2 and in the mounting groove 22. The upper fork plate 342 and the lower fork plate 343 are connected to the rear end of the tensioning member 2 by bolts. Specifically, in this embodiment, the lower fork plate 343 is provided with a threaded hole, and the upper fork plate 342 and the rear end of the tensioning member 2 are provided with bolt holes. The bolt passes through the bolt holes on the upper fork plate 342 and the bolt holes on the tensioning member 2 in sequence and is then threaded into the threaded hole on the lower fork plate 343, thereby realizing the connection between the tensioning member 2 and the drive rod 34.

[0044] This utility model also provides a broaching machine 02 for notching impact test specimens, which includes the fixing device 01 for notching impact test specimens as described above. Figure 7 As shown in the figure, in this embodiment, the broaching machine 02 for notching impact test specimens is a double broach design. The platform on the left side of the broach is fixedly installed with the fixing device 01 for notching impact test specimens as described in the above embodiment. The platform on the right side of the broach is a conventional mechanical clamping structure specimen fixing device.

[0045] In summary, the fixing device and broaching machine for notching impact test specimens provided by this utility model include a tensioning mechanism and a tensioning component in the fixing device. The tensioning mechanism drives the tensioning component to move, which allows the specimen to be pressed against the front end face of the positioning baffle on the base. The front end face of the positioning baffle serves as the positioning reference, thereby ensuring that the ligament width dimension after notching the impact test specimen will not exceed the tolerance, thus improving the processing accuracy of the impact test specimen.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A fixing device for notching impact test specimens, characterized in that, Includes a base, a tensioning element, and a tensioning mechanism; among which, The base has two positioning baffles spaced apart at its front end; The tensioning member is disposed between the two positioning baffles. The tensioning member has a U-shaped structure and a placement groove is provided on the top of the tensioning member for placing the sample. The tensioning mechanism is located at the rear end of the base, and the tensioning member is connected to the tensioning mechanism. The tensioning mechanism is used to drive the tensioning member to move along the front-back direction of the base. When the tensioning mechanism pulls the tensioning member, the front wall of the placement groove can bring the sample against the front end face of the two positioning baffles.

2. The fixing device for notching impact specimens according to claim 1, characterized in that, The front end of the base is also provided with a placement platform for placing the sample, and the two positioning baffles are located on the rear side of the placement platform.

3. The fixing device for notching impact specimens according to claim 2, characterized in that, A positioning block is provided on one side of the placement platform, and the positioning block is detachably connected to the placement platform.

4. The fixing device for notching impact specimens according to claim 2, characterized in that, The placement platform has a forward-facing groove in the middle, which extends vertically through the placement platform.

5. The fixing device for notching impact specimens according to claim 2, characterized in that, The placement platform is also provided with two upward-facing sliding grooves, which extend through the placement platform along the front-rear direction of the base, and the front end of the tensioning member is slidably disposed in the two sliding grooves.

6. The fixing device for notching impact specimens according to claim 2, characterized in that, A middle baffle is also provided between the two positioning baffles, and the width of the middle baffle is the same as the width of the U-shaped opening of the tensioning member.

7. The fixing device for notching impact specimens according to claim 1, characterized in that, The tensioning mechanism includes a fixed base, a rotating shaft, a turntable, and a drive rod; The fixing seat is disposed on the base, and the fixing seat has a through mounting hole. The front end of the rotating shaft is provided with an external thread, the front end of the rotating shaft is inserted into the mounting hole, the middle part of the rotating shaft is rotatably connected to the rear end of the fixed base, and the turntable is fixedly connected to the rear end of the rotating shaft. The drive rod is slidably disposed in the mounting hole, and the drive rod has an internal thread hole that matches the external thread at the front end of the rotating shaft. The drive rod is threadedly connected to the front end of the drive rod. The front end of the drive rod extends out of the front end of the mounting hole, and the tensioning member is connected to the front end of the drive rod.

8. The fixing device for notching impact specimens according to claim 7, characterized in that, A rotating plate is provided in the middle of the rotating shaft, and a circular groove for accommodating the rotating plate is provided at the rear end of the fixed base. The rotating plate is rotatably disposed in the circular groove, and a fixed sealing plate is detachably connected to the outside of the circular groove.

9. The fixing device for notching impact specimens according to claim 7, characterized in that, The tensioning member has a mounting groove at its rear end bottom, and the drive rod has an upper fork plate and a lower fork plate at its front end. The upper fork plate and the lower fork plate are respectively located at the top of the rear end of the tensioning member and in the mounting groove. The upper fork plate and the lower fork plate are connected to the rear end of the tensioning member by bolts.

10. A broaching machine for machining notches on impact specimens, characterized in that, Includes the fixing device for notching impact test specimens as described in any one of claims 1-9.

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