CN219485349U - Clamp for grinding and polishing cylindrical sample of Hopkinson bar - Google Patents

Abstract

The utility model relates to the technical field of Hopkinson bar experiments, in particular to a clamp for grinding and polishing a cylindrical sample of a Hopkinson bar. The support comprises a support piece, wherein the support piece comprises an arc-shaped support plate and an arc-shaped buckle plate movably hinged to one side of the arc-shaped support plate, the arc-shaped support plate and the arc-shaped buckle plate are closed to form a circular tube shape, an end face clamping mechanism is arranged at the upper end of the support piece, the end face clamping mechanism comprises an end face base, and a plurality of end face clamping pieces are uniformly arranged on the end face outside the end face base along the circumferential direction of the end face base; the lower end of the supporting piece is provided with a side clamping mechanism, and the side clamping mechanism comprises a side base. The polishing device is reasonable in structural design and convenient to operate, and can be used for effectively clamping the end part and the side surface of the cylindrical sample, so that the polishing process is smoother, the polishing accuracy is improved, a plurality of cylindrical samples can be polished simultaneously, the polishing efficiency is greatly improved, the requirement of Hopkinson bar experiments is met, and the problem in the prior art is solved.

Description

Clamp for grinding and polishing cylindrical sample of Hopkinson bar

Technical Field

The utility model relates to the technical field of Hopkinson bar experiments, in particular to a clamp for grinding and polishing a cylindrical sample of a Hopkinson bar.

Background

In the fields of aviation, aerospace, automobiles, transportation, packaging and other military and civil fields, engineering materials can encounter impact loading conditions such as high-speed collision and explosion, the mechanical response of the materials under the impact loading is known, and the engineering materials are beneficial to engineering application and engineering design of various materials. The mechanical properties of the material under dynamic load and those under static load are different, and compared with static experiments, dynamic experiments under high strain rate are still a small challenge. The hopkinson bar experiment is a very effective experimental method for effectively and accurately acquiring stress and strain curves related to the strain rate of materials.

At present, in the Hopkinson bar experiment, the roughness of the surface of a sample has a remarkable influence on the dynamic mechanical properties of the material under high strain rate, so that the inaccuracy of an experiment result is greatly increased. The cylindrical sample used in the Hopkinson bar experiment is usually only phi 2mm or phi 2mm 1mm in size and small in volume, and is difficult to clamp and fix, so that the subsequent polishing process is extremely difficult, and the error polishing even damages the end surface shape and position tolerance, and directly influences the accuracy of the experimental test result. In addition, most of the conventional polishing tools only polish the end part of the cylindrical sample, but cannot polish the side surface of the cylindrical sample, so that the accuracy of experimental results is affected to a certain extent. The hopkinson bar experiment usually tests the dynamic mechanical properties of the materials under various strain, strain rate and temperature conditions, so that the demand on the cylindrical samples is large, and how to improve the polishing efficiency of the cylindrical samples is very important.

Disclosure of Invention

The clamp for polishing the cylindrical samples of the Hopkinson bars is reasonable in structural design and convenient to operate, and can be used for effectively clamping the ends and the side faces of the cylindrical samples, so that polishing procedures are performed more smoothly, polishing accuracy is improved, a plurality of cylindrical samples can be polished at the same time, polishing efficiency is greatly improved, requirements of Hopkinson bar experiments are met, and problems in the prior art are solved.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the clamp for grinding and polishing the cylindrical sample of the Hopkinson bar comprises a supporting piece, wherein the supporting piece comprises an arc-shaped supporting plate and an arc-shaped buckle plate movably hinged to one side of the arc-shaped supporting plate, the arc-shaped supporting plate and the arc-shaped buckle plate are closed to form a circular tube shape, an end face clamping mechanism is arranged at the upper end of the supporting piece, the end face clamping mechanism comprises an end face base, and a plurality of end face clamping pieces are uniformly arranged on the end face outside the end face base along the circumferential direction of the end face; the lower end of the supporting piece is provided with a side clamping mechanism, the side clamping mechanism comprises a side base, and a plurality of side clamping pieces are uniformly arranged on the outer end face of the side base along the circumferential direction of the side base.

Optionally, the end surface clamping piece comprises an upper groove arranged on the surface of the end surface base, an extrusion plate is horizontally arranged in the upper groove, a clamping seat is arranged in the center of the bottom of the extrusion plate, a bolt is movably clamped in the clamping seat of the extrusion plate through a clamping block arranged at the top of the bolt, the bottom end of the bolt vertically penetrates out of the end surface base downwards, an inner hexagonal groove is arranged on the end surface of the bottom of the bolt, and a thread seat in threaded connection with the bolt is arranged at the bottom of the end surface base at the outer side of the bolt; the upper groove above the extrusion plate is internally provided with an extrusion strip, the inner end of the horizontally arranged pull rod penetrates through the side surface of the end surface base and extends into the upper groove and is connected to the middle position of the side wall of the extrusion strip, and the pull rod between the extrusion strip and the inner wall of the upper groove is sleeved with a reset spring.

Optionally, at least two arc grooves are arranged on the side wall of the extrusion strip at the side far away from the pull rod along the length direction.

Optionally, a clamping groove is formed in the inner wall of the upper groove corresponding to the position of the reset spring, and the outer end of the reset spring is clamped in the clamping groove.

Optionally, the side holder is equipped with the helicla flute rather than being linked together including setting up on the side base that corresponds the lower groove position on the side base, be equipped with the elasticity clamping piece in lower groove inner wall bilateral symmetry, the upper end of elasticity clamping piece is fixed in the helicla flute bottom through the fixed plate, its lower extreme is inwards buckled, the helicla flute internal thread above two elasticity clamping pieces is equipped with the pushing down seat, be equipped with the holding down plate between two elasticity clamping pieces in the level, the holding down plate is equipped with the stirring piece through the square movable joint of square at its periphery between two elasticity clamping pieces and lower groove at the pushing down seat surface, the vertical seat central authorities that pass of pushing down links to each other with the holding down plate, the extension spring is established to the cover on the pushing down rod between holding down plate and the pushing down seat, be equipped with two pushing down rollers in the square parallel arrangement of axial lead of pushing down roller and elasticity clamping piece width respectively in the square below the holding down plate.

Optionally, a pulling cap is arranged at the upper end of the pressing rod.

Optionally, a pushing groove communicated with the lower groove is arranged in the center of the bottom of the side base.

The utility model adopts the technical proposal and has the advantages that: structural design is reasonable, convenient operation can realize carrying out effective centre gripping to tip and the side of cylinder sample to make the grinding and polishing process more smooth and easy going on, improve the accuracy of grinding and polishing, and can grind and throw a plurality of cylinder samples simultaneously, improved the grinding and polishing efficiency greatly, satisfied the demand of hopkinson pole experiment.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic view of the bottom structure of FIG. 1;

FIG. 3 is a schematic view of the cross-sectional structure of A-A of FIG. 2;

FIG. 4 is a schematic perspective view of a pressing seat;

FIG. 5 is a schematic perspective view of the resilient clip;

FIG. 6 is a schematic perspective view of a frame, a lower platen, and a lower press lever;

FIG. 7 is a schematic perspective view of a bolt and a squeeze plate;

FIG. 8 is a schematic perspective view of the extrusion bar and the tie rod;

FIG. 9 is a schematic perspective view of an arc support plate, an end base, and a side base;

in the figure, 1, an arc-shaped supporting plate; 2. an arc buckle plate; 3. an end surface base; 4. a side base; 5. an upper groove; 6. an extrusion plate; 7. a bolt; 8. an inner hexagonal groove; 9. a screw seat; 10. extruding the strip; 11. a pull rod; 12. a return spring; 13. an arc-shaped groove; 14. a clamping groove; 15. a lower groove; 16. a thread groove; 17. an elastic clamping piece; 18. a fixing plate; 19. pressing down a seat; 20. a lower pressing plate; 21. a block; 22. a poking block; 23. pressing down a rod; 24. a tension spring; 25. a lower press roll; 26. pulling the cap; 27. a pushing groove; 28. a clamping seat; 29. and (5) clamping blocks.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present utility model will be described in detail below with reference to the following detailed description and the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc. indicate or refer to an azimuth or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1-9, in this embodiment, a clamp for polishing a cylindrical sample of a hopkinson rod includes a support member, where the support member includes an arc support plate 1 and an arc buckle plate 2 movably hinged to one side of the arc support plate 1, the arc support plate 1 and the arc buckle plate 2 are closed to form a circular tube, an end surface clamping mechanism is provided at an upper end of the support member, the end surface clamping mechanism includes an end surface base 3, and a plurality of end surface clamping members are uniformly provided on an end surface of an outer side of the end surface base 3 along a circumferential direction thereof; the lower end of the supporting piece is provided with a side clamping mechanism, the side clamping mechanism comprises a side base 4, and a plurality of side clamping pieces are uniformly arranged on the outer side end face of the side base along the circumferential direction of the side base.

Optionally, the end surface clamping piece comprises an upper groove 5 arranged on the surface of the end surface base 3, an extrusion plate 6 is horizontally arranged in the upper groove 5, a clamping seat 28 is arranged in the center of the bottom of the extrusion plate 6, a bolt 7 is movably clamped in the clamping seat 28 of the extrusion plate 6 through a clamping block 29 arranged at the top of the bolt 7, the bottom end of the bolt vertically penetrates out of the end surface base downwards, an inner hexagonal groove 8 is arranged on the end surface of the bottom of the bolt 7, and a thread seat 9 which is in threaded connection with the bolt 7 is arranged at the bottom 3 of the end surface base outside the bolt 7; an extrusion strip 10 is arranged in the upper groove 5 above the extrusion plate 6, a horizontally arranged pull rod 11 is arranged, the inner end of the pull rod passes through the side surface of the end surface base 3 and extends into the upper groove 5 and is connected to the middle position of the side wall of the extrusion strip 10, and a reset spring 12 is sleeved on the pull rod 11 between the extrusion strip 10 and the inner wall of the upper groove 5.

Optionally, at least two arc-shaped grooves 13 are provided along the length direction of the side wall of the extrusion strip 10 on the side far from the pull rod 11. The arc groove 13 can be clamped on the side face of the cylindrical sample, so that the fixing effect is better, and the clamping is firmer.

Optionally, a clamping groove 14 is arranged on the inner wall of the upper groove 5 corresponding to the position of the return spring 12, and the outer end of the return spring 12 is clamped in the clamping groove 14. The clamping groove 14 has a limiting effect on the reset spring 12, and on the other hand, the length of the reset spring 12 can be increased, so that the deformation force of the reset spring is increased, and a cylindrical sample is better extruded through the extrusion strip 10.

Optionally, the side clamping piece includes the lower groove 15 that sets up on the side base 4, be equipped with the screw thread groove 16 rather than being linked together on the side base 4 that corresponds lower groove 15 position, be equipped with elasticity clamping piece 17 in lower groove 15 inner wall bilateral symmetry, the upper end of elasticity clamping piece 17 is fixed in screw thread groove 16 bottom through fixed plate 18, its lower extreme is inwards buckled, screw thread 16 internal thread above two elasticity clamping pieces 17 is equipped with down press seat 19, be equipped with holding down plate 20 between two elasticity clamping pieces 17 horizontally, holding down plate 20 is through setting up square 21 movable joint between two elasticity clamping pieces 17 and lower groove 15 all around, be equipped with on the surface of holding down seat 19 and stir piece 22, lower depression bar 23 vertically pass and link to each other with holding down plate 20 in holding down seat 19 center, cover establishes extension spring 24 on lower depression bar 23 between holding down plate 20 and holding down seat 19, be equipped with two holding down rollers 25 respectively in holding down plate 20 below square parallel arrangement of axis and elasticity clamping piece 27 width.

Optionally, a pulling cap 26 is provided at the upper end of the pressing rod 23. The operator pulls the push-down lever 23 by pulling the pulling cap 26.

Optionally, a pushing groove 27 is provided in the center of the bottom of the side base 4 and is in communication with the lower groove 15. It is convenient to feed the cylindrical sample from the push channel 27 between the two resilient clips 17.

When the clamp is used, the position of the cylindrical sample can be selected to be polished. When the end part of the cylindrical sample needs to be polished, the cylindrical sample can be placed into the upper groove 5 one by one, the pull rod 11 is pulled to be pulled outwards, so that the extrusion strip 10 moves outwards in the upper groove 5, the cylindrical sample is clamped in the arc-shaped groove 13 of the extrusion strip 10, the pull rod 11 is loosened, and the pull rod 11 pushes the extrusion strip 10 to move under the action force of restoring deformation of the reset spring 12 until the extrusion strip 10 extrudes the cylindrical sample on the inner wall of the upper groove 5. At this time, the position of the outer end of the cylindrical sample extending out of the end surface base 3 is observed, if the outer end of the cylindrical sample does not extend out, a tool can be inserted into the inner hexagonal groove 8, so that the bolt 7 is screwed, the bolt 7 is pushed to move upwards through the threaded seat 9, the clamping seat 28 and the extrusion plate 6 move together along with the upward movement of the bolt 7, and finally the end part of the cylindrical sample is outwards ejected out to extend out of the end surface base 3. Finally, holding the supporting piece, putting one end of the end surface base 3 downwards, and putting the end surface base on a polishing disk of a polishing machine for polishing. The ends of a plurality of cylindrical samples can be polished at the same time by one polishing.

When the side of the cylindrical specimen needs to be polished, the cylindrical specimen can be clamped between the two elastic clamping pieces 17, at this time, the cylindrical specimen lifts up the two lower pressing rollers 25, and the tension spring 24 is in a compressed state. In the absence of an external force pushing the cylindrical specimen, the two lower press rollers 25 tightly press the cylindrical specimen so that a portion of the side wall of the cylindrical specimen protrudes beyond the edge of the side base 4. If the side wall of the cylindrical sample does not extend out of the side base 4, the toggle block 22 can be screwed to enable the pressing seat 19 to rotate downwards in the thread groove 16, and the pressing rod 23, the pressing plate 20, the square frame 21 and the pressing roller 25 are driven to move downwards along with the continuous downward movement of the pressing seat 19 until the pressing roller 25 can clamp the cylindrical sample. The lower press roller 25 continuously presses the lower press roller 25 under the action of the tension spring 24, so that a part of the side surface of the cylindrical sample can extend out of the side surface base 4. Finally, holding the supporting piece, putting one end of the side base 4 downwards, and putting the side base on a polishing disk of a polishing machine for polishing. Along with the rotation of the polishing disk, the side wall of the cylindrical sample is polished, and the cylindrical sample rotates, so that the whole side face is polished, and the side faces of a plurality of cylindrical samples can be polished at the same time in a single polishing. The polishing device is reasonable in structural design and convenient to operate, and can be used for effectively clamping the end part and the side surface of the cylindrical sample, so that the polishing process is smoother, the polishing accuracy is improved, a plurality of cylindrical samples can be polished simultaneously, the polishing efficiency is greatly improved, the requirement of Hopkinson bar experiments is met, and the problem in the prior art is solved.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model and are intended to be within the scope of the appended claims and description; any alternative modifications or variations to the embodiments of the present utility model will fall within the scope of the present utility model for those skilled in the art.

The present utility model is not described in detail in the present application, and is well known to those skilled in the art.

Claims (7)

1. The clamp for grinding and polishing the cylindrical sample of the Hopkinson bar is characterized by comprising a supporting piece, wherein the supporting piece comprises an arc-shaped supporting plate and an arc-shaped buckle plate movably hinged to one side of the arc-shaped supporting plate, the arc-shaped supporting plate and the arc-shaped buckle plate are closed to form a circular tube shape, an end face clamping mechanism is arranged at the upper end of the supporting piece, the end face clamping mechanism comprises an end face base, and a plurality of end face clamping pieces are uniformly arranged on the outer end face of the end face base along the circumferential direction of the end face base; the lower end of the supporting piece is provided with a side clamping mechanism, the side clamping mechanism comprises a side base, and a plurality of side clamping pieces are uniformly arranged on the outer end face of the side base along the circumferential direction of the side base.

2. The clamp for grinding and polishing the cylindrical sample of the Hopkinson bar according to claim 1, wherein the end surface clamping piece comprises an upper groove arranged on the surface of an end surface base, an extrusion plate is horizontally arranged in the upper groove, a clamping seat is arranged in the center of the bottom of the extrusion plate, a bolt is movably clamped in the clamping seat of the extrusion plate through a clamping block arranged at the top of the bolt, the bottom end of the bolt vertically penetrates out of the end surface base downwards, an inner hexagonal groove is arranged on the end surface of the bottom of the bolt, and a thread seat connected with threads of the bolt is arranged at the bottom of the end surface base outside the bolt; the upper groove above the extrusion plate is internally provided with an extrusion strip, the inner end of the horizontally arranged pull rod penetrates through the side surface of the end surface base and extends into the upper groove and is connected to the middle position of the side wall of the extrusion strip, and the pull rod between the extrusion strip and the inner wall of the upper groove is sleeved with a reset spring.

3. The fixture for polishing a cylindrical sample of a hopkinson rod according to claim 2, wherein at least two arc-shaped grooves are provided along the length direction of the side wall of the extrusion strip on the side far from the pull rod.

4. The clamp for polishing the cylindrical sample of the Hopkinson bar according to claim 2, wherein a clamping groove is formed in the inner wall of the upper groove corresponding to the position of the return spring, and the outer end of the return spring is clamped in the clamping groove.

5. The clamp for grinding and polishing the cylindrical sample of the Hopkinson bar according to claim 1, wherein the side clamping piece comprises a lower groove arranged on the side base, a thread groove communicated with the lower groove is formed in the side base corresponding to the position of the lower groove, elastic clamping pieces are symmetrically arranged on two sides of the inner wall of the lower groove, the upper ends of the elastic clamping pieces are fixed at the bottom of the thread groove through fixing plates, the lower ends of the elastic clamping pieces are bent inwards, a lower pressing seat is arranged on the thread groove above the two elastic clamping pieces through internal threads, a lower pressing plate is horizontally arranged between the two elastic clamping pieces and is clamped between the two elastic clamping pieces and the lower groove through a square frame arranged around the lower pressing pieces, a toggle block is arranged on the surface of the lower pressing seat, the lower pressing rod vertically penetrates through the center of the lower pressing seat to be connected with the lower pressing plate, a tension spring is sleeved on the lower pressing rod between the lower pressing plate and the lower pressing seat, two lower pressing rollers are respectively arranged in the square frame below the lower pressing plate, and the axis of the lower pressing rollers are parallel to the width of the elastic clamping pieces.

6. The fixture for polishing a cylindrical sample of a hopkinson rod according to claim 5, wherein a pull cap is provided at an upper end of the push-down rod.

7. The fixture for polishing cylindrical samples of hopkinson bars according to claim 5, wherein a pushing groove communicated with the lower groove is arranged at the center of the bottom of the side base.