CN109894889B

CN109894889B - Clamping method and device suitable for thin workpiece

Info

Publication number: CN109894889B
Application number: CN201910209127.7A
Authority: CN
Inventors: 殷勇
Original assignee: Sinosteel Xian Machinery Co Ltd
Current assignee: Sinosteel Xian Machinery Co Ltd
Priority date: 2019-03-19
Filing date: 2019-03-19
Publication date: 2021-02-09
Anticipated expiration: 2039-03-19
Also published as: CN109894889A

Abstract

The invention provides a clamping device suitable for a thin workpiece, which comprises a positioning piece and a clamping tool, wherein the positioning piece and the clamping tool are arranged on two opposite sides of the workpiece; the clamping tool comprises a hook head seat and a jacking shaft for jacking a workpiece, the workpiece is placed on a workbench with a T-shaped groove, and one side of the workpiece is positioned; the hook head of the hook head seat is placed in the T-shaped groove, the jacking shaft penetrates through the hook head seat and jacks the other side of the workpiece tightly, and the reaction force of the workpiece on the hook head seat enables the hook head to be connected with the workbench more tightly. The clamping method suitable for the thin workpiece depends on the clamping device. The invention is positioned at one side of the workpiece, and the other opposite side is tightly propped through the jacking shaft, thereby clamping the workpiece.

Description

Clamping method and device suitable for thin workpiece

Technical Field

The invention relates to the field of technical equipment such as machining and the like, in particular to a clamping method and a clamping device suitable for a thin workpiece.

Background

For machining the upper and lower planes (or curved surfaces) of a large thin plate-shaped workpiece, a T-shaped groove on a workbench is generally used for clamping the workpiece through auxiliary equipment such as a positioning column, a sizing block, an oblique iron and the like. When the clamping device is used, the workpiece can be clamped only by manually knocking the wedge, the clamping force is inconsistent due to manual knocking, and the problems of workpiece deformation and the like are easily caused.

Accordingly, there is a need for a new clamping method and apparatus to solve the above problems.

Disclosure of Invention

The invention provides a clamping method and a clamping device suitable for a thin workpiece.

The technical scheme for realizing the purpose of the invention is as follows:

a clamping method for thin workpieces, comprising the steps of:

placing a workpiece on a workbench with a T-shaped groove;

placing a positioning piece at one side of the workpiece, and enabling one side wall of the workpiece to be tightly attached to the positioning piece, so that the positioning piece can position one side of the workpiece;

the other side of the workpiece is fixed nearby the hook head seat, the ejector shaft penetrates through the hook head seat to tightly push the other opposite side wall of the workpiece, and the workpiece is clamped through the positioning piece and the ejector shaft.

As a further improvement of the present invention, the hook head seat is fixed in the following manner: the hook head seat is inserted into the T-shaped groove.

A clamping device suitable for a thin workpiece comprises a positioning piece and a clamping tool, wherein the positioning piece and the clamping tool are arranged on two opposite sides of the workpiece;

the clamping tool comprises a hook head seat and a jacking shaft for jacking a workpiece, the workpiece is placed on a workbench with a T-shaped groove, and one side of the workpiece is positioned;

the hook head of the hook head seat is placed in the T-shaped groove, the jacking shaft penetrates through the hook head seat and jacks the other side of the workpiece tightly, and the reaction force of the workpiece on the hook head seat enables the hook head to be connected with the workbench more tightly. The invention is positioned at one side of the workpiece, and the other opposite side is tightly propped through the jacking shaft, thereby clamping the workpiece.

As a further improvement of the invention, the hook head seat and the workbench are relatively fixed by utilizing a lever principle.

As a further improvement of the invention, the hook head seat is composed of a hook head and a seat body, the seat body is positioned above the hook head, the bottom surface of the seat body is contacted with the table surface of the workbench, the head part of the hook head is arranged at the bottom of the T-shaped groove, and the upper surface of the head part is contacted with the step surface of the T-shaped groove.

As a further improvement of the invention, a fulcrum is formed between the upper surface of the hook head and an external corner in the T-shaped groove, and the junction of the hook head and the seat body is abutted against the convex edge of the notch of the T-shaped groove to form another fulcrum; after the workpiece applies reaction force to the base body, the two supporting points enable the hook head to be connected with the workbench more tightly. The external corner of the invention refers to a protruded corner (such as the corner at point A in the figure) in the T-shaped groove. One fulcrum of the invention refers to point A in figure 1, another fulcrum refers to point B in figure 1, when the workpiece gives a reaction force to the hook head seat, point A and point B produce acting force at the same time, by using the lever principle, the larger the reaction force of the workpiece to the hook head seat is, the larger the acting force of point A and point B is, and the closer the hook head seat is fixed with the workbench.

As a further improvement of the invention, the hook head and the seat body are integrally formed.

As a further improvement of the invention, the jackscrew is arranged on the jacking shaft, the screw hole matched with the jackscrew is arranged on the gib head seat, and the jackscrew is screwed tightly to jack the workpiece.

As a further improvement of the invention, the included angle between the axis of the threaded hole and the upper surface of the workbench is 15-25 degrees. The included angle between the threaded hole and the plane of the workbench is 15-25 degrees, so that a downward component force is generated in the tightening process of the jackscrew, and the clamping effect is not influenced by the fact that a workpiece is prevented from bouncing upwards.

As a further improvement of the invention, the threaded hole is formed in the seat body of the hook head seat.

As a further improvement of the invention, a certain distance is reserved between the workpiece and the hook head seat, a jacking block is arranged between the workpiece and the hook head seat, and a jacking shaft penetrates through the hook head seat to jack the jacking block so as to clamp the workpiece. When a certain distance exists between the workpiece and the hook head seat, the ejector block is positioned between the workpiece and the hook head seat, the ejector shaft pushes the ejector block tightly through the jackscrew, the opposite side is in contact with the ejector block due to the positioning of one side of the workpiece, the ejector block is pushed tightly through the jackscrew, then the opposite side of the workpiece is also pushed tightly, at the moment, the workpiece is positioned on one side, the opposite side is pushed tightly, and the workpiece is clamped tightly.

Compared with the prior art, the invention has the beneficial effects that:

the invention fixes the thin-wall part in a positioning and tightening way, is convenient, reliable and quick, and avoids the deformation of the thin workpiece caused by uneven clamping force.

Drawings

FIG. 1 is a schematic view of a clamping device suitable for use with thin workpieces;

FIG. 2 is a schematic view of a clamping tool;

FIG. 3 is a schematic view of the hook head seat;

FIG. 4 is a product layout view of the hook base;

FIG. 5 is a top view of FIG. 4;

FIG. 6 is a schematic view of a platen assembly;

FIG. 7 is a schematic view of a bird platen.

In the figure, 100, clamping tooling; 200. a positioning member; 1. a hook head seat; 11. a base body; 111. a through groove; 12. a hook head; 121. a head portion; 122. a neck portion; 2. a top shaft; 3. a top block; 4. a workpiece; 5. a work table; a. the direction of projection of the head; b. the protruding direction of the seat body; c. a front side; d. a back side; e. the thickness direction of the seat body; 10. A T-shaped screw seat; 20. a bird-shaped press plate; 21. a cavity; 30. A screw; 40. a hemispherical washer; 50. and a nut.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1:

the embodiment discloses a clamping method suitable for a thin workpiece, which comprises the following steps:

placing a workpiece 4 on a workbench 5 with a T-shaped groove;

placing a positioning piece 200 at one side of the workpiece 4, and tightly attaching one side wall of the workpiece 4 to the positioning piece 200, wherein the positioning piece 200 realizes the positioning of one side of the workpiece 4;

the hook head seat 1 is fixed at the other side of the workpiece 4 nearby, the top shaft 2 penetrates through the hook head seat 1 to tightly push against the other opposite side wall of the workpiece 4, and the workpiece is clamped through the positioning piece 200 and the top shaft 2. The fixing mode of the hook head seat 1 is as follows: the hook head seat 1 is inserted into the T-shaped groove.

As shown in fig. 1 and fig. 2, a clamping device suitable for a thin workpiece includes a positioning member 200 and a clamping tool 100, wherein the positioning member 200 and the clamping tool 100 are disposed on two opposite sides of a workpiece 4; the clamping tool 100 comprises a hook head seat 1 and a jacking shaft 2 for jacking a workpiece 4, wherein the workpiece 4 is placed on a workbench 5 with a T-shaped groove, and one side of the workpiece 4 is positioned; the hook head 12 of the hook head seat 1 is placed in the T-shaped groove, the jacking shaft 2 penetrates through the hook head seat 1 and jacks the other side of the workpiece 4, and the reaction force of the workpiece 4 on the hook head seat 1 enables the hook head 12 to be connected with the workbench 5 more tightly. The embodiment positions one side of the workpiece 4, and the opposite side is tightly jacked through the jacking shaft 2, so that the workpiece 4 is clamped, and the clamping device has the advantage of convenience in clamping.

Note that, in this embodiment, one side of the workpiece 4 is positioned, and the positioning manner may be the clamping tool for the T-shaped groove in this embodiment, but may also be the other positioning manner. Other modes can adopt the dog location to fix a position, of course can also adopt the sheet metal below to process T type piece location.

The hook head base 1 of the present embodiment is relatively fixed to the table 5 by using the principle of leverage. The hook head seat 1 is composed of a hook head 12 and a seat body 11, the seat body 11 is located above the hook head 12, the bottom surface of the seat body 11 is in contact with the table top of the workbench 5, the head of the hook head 12 is arranged at the bottom of the T-shaped groove, and the upper surface of the head is in contact with the step surface of the T-shaped groove. The step surface of the present embodiment refers to the D surface in fig. 2.

Preferably, a fulcrum is formed between the upper surface of the hook head 12 and the external corner in the T-shaped groove, and the junction of the hook head 12 and the seat body 11 is abutted against the convex edge of the notch of the T-shaped groove to form another fulcrum; the two supporting points enable the hook head 12 to be connected with the workbench 5 more tightly after the workpiece 4 applies reaction force to the seat body 11. The external corner of the present embodiment refers to a protruding corner (e.g., the corner at point a in fig. 2) in the T-shaped groove. In the present embodiment, one fulcrum refers to point a in fig. 2, and the other fulcrum refers to point B in fig. 2, when the workpiece 4 gives a reaction force to the hook head base 1, the point a and the point B generate forces at the same time, and by using the principle of leverage, the larger the reaction force of the workpiece 4 to the hook head base 1 is, the larger the forces of the point a and the point B are, and the closer the hook head base 1 is fixed to the worktable 5.

In order to ensure the rigidity and strength of the hook head 12 and the holder body 11, the hook head 12 and the holder body 11 of the present embodiment are integrally formed.

As shown in fig. 1 and 2, preferably, the jacking shaft 2 is provided with a jacking screw, the hook head seat 1 is provided with a threaded hole matched with the jacking screw, and the jacking screw is screwed tightly against the workpiece 4. The included angle between the axis of the threaded hole and the upper surface of the workbench 5 is 15-25 degrees. Preferably, the threaded hole is opened on the seat body 11 of the hook head seat 1. The threaded hole and the plane of the working table 5 form an included angle of 15-25 degrees, so that a downward component force is generated in the tightening process of the jackscrew, and the workpiece 4 is prevented from being bounced upwards to influence the clamping effect. When the included angle between the threaded hole and the plane of the workbench 5 is smaller than 15 degrees, the jacking shaft 2 cannot be screwed in or out of the threaded hole conveniently, when the included angle between the threaded hole and the working plane is larger than 25 degrees, the downward component force generated by the jackscrew in the screwing process is reduced, the workpiece 4 is likely to bounce upwards after being clamped, and the clamping effect is poor.

When a certain distance exists between the workpiece 4 and the hook head seat 1, the ejector block 3 is placed between the workpiece 4 and the hook head seat 1, and the ejector shaft 2 penetrates through the hook head seat 1 to abut against the ejector block 3, so that the workpiece 4 is clamped. When having the certain distance between work piece 4 and gib head seat 1, kicking block 3 is located between work piece 4 and the gib head seat 1, and apical axis 2 passes through the tight kicking block 3 in jackscrew top, because one side location of work piece 4, relative opposite side and the contact of kicking block 3, and kicking block 3 passes through the jackscrew top tightly, and then the opposite side of work piece 4 is also by the top tightly, and 4 one side location of work piece this moment, the opposite side is by the top tightly, has realized the clamp of work piece 4 tightly.

As shown in fig. 2, in the clamping tool of this embodiment, a hook head portion of the hook head base 11 hooks the T-shaped groove by using a lever principle, and a lower plane of the hook head base 1 is attached to the workbench 5, so that the hook head base 1 is stably placed at the position of the T-shaped groove, and is screwed down by a jackscrew to abut against the workpiece 4 or the ejector block 3. The jackscrew is connected with the hook head seat 1 through threads, and the diameter of the threads is about M20 generally. An included angle of 15-25 degrees is formed between a threaded hole in the hook head seat 1 and the plane of the workbench 5, so that a downward component force is generated in the tightening process of the jackscrew, and the workpiece 4 or the jacking block 3 is prevented from bouncing upwards to influence the clamping effect. The workpiece 4 is placed on a table 5, which is positioned in a suitable way on one side and fixed in the way described above on the other side. The hook head seat 1 is arranged in a T-shaped groove closest to the workpiece 4, the workpiece 4 is clamped through a jackscrew or the workpiece 4 is clamped through the ejector block 3 by utilizing an inclined threaded hole on the hook head seat 1 (when a certain distance exists between the workpiece 4 and the hook head seat 1), the distance between the jackscrew head and the workbench 5 is as small as possible, and the hook head seat is more suitable for clamping ultra-thin workpieces.

A thin workpiece is arranged on a workbench 5, a hook head seat 1 is arranged in a close T-shaped groove, and a jackscrew is used for clamping a workpiece 4 through a jacking block 3, so that an upper plane (curved surface) can be machined. If the distance between the workpiece 4 and the hook head seat 1 is short, the ejector block 3 can be omitted, and the workpiece 4 can be directly jacked by a jackscrew. The clamping tool is simple in structure, convenient and fast to clamp, high in reliability after clamping, capable of avoiding the possibility of deformation of the workpiece 4 caused by uneven clamping force due to the fact that the workpiece is knocked and clamped by a wedge, and capable of improving working efficiency.

Example 2:

on the basis of the scheme disclosed in embodiment 1, the present embodiment mainly discloses the structure of the hook head seat 1. As shown in fig. 3, 4 and 5, the hook head seat 1 includes a hook head 12, a seat body 11 extending upward from an end of the hook head 12, the hook head 12 is placed in a T-shaped groove with a wide lower part and a narrow upper part, the T-shaped groove is composed of a wide part and a narrow part, the T-shaped groove is opened on the workbench 5, and a lower surface of the seat body 11 is in contact with a table top of the workbench 5; the junction of the wide part and the narrow part is a step surface, the step surface and the side surface of the narrow part form a first external corner, and the side surface of the narrow part and the table surface of the workbench 5 form a second external corner; the hook head 12 consists of a head part and a neck part, the neck part is positioned between the head part and the seat body 11, the head part is positioned in the cavity of the wide part, and the neck part is positioned in the cavity of the narrow part; a fulcrum is formed between the upper surface of the head and the first external corner, and the back surface of the neck is propped against the second external corner to form another fulcrum; the workpiece 4 provides an acting force for the base body 11, and the two fulcrums make the hook head base 1 and the workbench 5 connected more tightly by utilizing the lever principle.

The hook head seat 1 of the embodiment is directly inserted into the T-shaped groove, the workpiece 4 is abutted against the seat body 11, so that one side of the workpiece 4 can be positioned, and the hook head seat 1 has the advantages of simple structure and convenience in use. The external corner of this embodiment refers to the protruding corner in the T-shaped groove, one fulcrum in this embodiment refers to point a in fig. 2, and the other fulcrum refers to point B in fig. 2, when the workpiece 4 gives the seat body 11 a reaction force, point a and point B generate an acting force at the same time, and by using the lever principle, the larger the reaction force of the workpiece 4 to the seat body 11 is, the larger the acting forces of point a and point B are, and the closer the hook head seat 1 is fixed to the workbench 5.

The angle that comes is protruding in the T type groove of this embodiment, and then explains that has the step in the T type groove, and the upper surface of head contacts with the lower surface of step. In the embodiment, the upper surface of the head is in contact with the lower surface of the step in the T-shaped groove, the contact surface between the head and the T-shaped groove is enlarged, an acting force is applied to the base body 11 by the workpiece 4, the acting force between the head and the T-shaped groove is not changed, and the pressure is reduced due to the enlarged stressed area of the step of the head and the T-shaped groove. The pressure is reduced, so that the pressure value uniformly distributed at the first external corner is reduced, the first external corner is not easy to damage in the using process, and the workbench 5 is used for a longer time.

In the present embodiment, the hook head 12 is integrally formed with the seat body 11. The hook head 12 and the seat body 11 of the embodiment are integrally formed to be a blank, and have the advantages of good integrity and high strength.

In the embodiment, the back surface of the neck is preferably an inclined surface, and the inclined surface and the bottom surface of the head form an included angle of 60-80 degrees. Preferably the inclined surface is at an angle of 75 ° to the bottom surface of the head. The back of the neck of this embodiment is beveled, which facilitates the formation of a fulcrum between the bevel and the second external corner. The protruding direction of the head is opposite to the protruding direction of the seat body 11 with the neck as the reference. The front face of the neck is an inclined face, and the inclined face and a vertical plane form an included angle of 10-15 degrees. Preferably the angle between the inclined surface and the vertical plane is 10 °.

In this embodiment, a through groove is formed in the bottom surface of the seat body 11, an opening of the through groove faces downward, the through groove is arranged along the thickness direction of the seat body 11, and a second external corner is arranged below the through groove. When the workpiece 4 applies an acting force to the seat body 11, the entire hook head seat 1 slightly rotates around the fulcrum at the second external corner, and the purpose of providing the through groove on the seat body 11 in this embodiment is to ensure that the bottom surface of the seat body 11 does not interfere with the table top of the workbench 5 when the entire hook head seat 1 rotates around the fulcrum at the second external corner, thereby ensuring the normal rotation of the hook head seat 1.

Example 3:

on the basis of the solutions disclosed in

embodiments

1 and 2, as shown in fig. 6, two opposite sides of the workpiece are respectively provided with a pressing plate assembly, the two pressing plate assemblies are arranged oppositely, the structures of the two pressing plate assemblies are the same, the pressing plate assemblies press the top surface of the thin workpiece, and the pressing plate assemblies are located in the middle of the thin workpiece in the length direction.

Each platen assembly includes: bird type clamp plate 20, screw rod 30, with screw rod 30 complex nut 50, screw rod 30 is fixed on the workstation, and supreme middle part that runs through bird type clamp plate 20 is down followed to screw rod 30, and the work piece is pushed down to the mouth of bird type clamp plate 20, and the afterbody of bird type clamp plate 20 directly supports and holds on the mesa of workstation, thereby compresses tightly the work piece through screwing nut 50. The mouth of the bird-shaped pressing plate 20 presses the workpiece, the tail of the bird-shaped pressing plate 20 directly abuts against the table top of the workbench, the screw 30 is fixed on the workbench, and the workpiece is pressed by screwing the nut 50.

It should be noted that, in the present embodiment, the nut 50 compresses the bird-shaped pressing plate 20, and then the workpiece is clamped, a horizontal plane may be cut on the top surface of the bird-shaped pressing plate, the nut 50 is continuously screwed until the bottom surface of the nut 50 is tightly attached to the horizontal plane, the workpiece is compressed under the action of the thread, of course, an intermediate compressing member may be disposed between the nut 50 and the bird-shaped pressing plate, the intermediate compressing member is sleeved on the screw 30, and the nut 50 compresses the intermediate compressing member, and the intermediate compressing member compresses the bird-shaped pressing plate 20. There are various ways in which the nut 50 of the present embodiment may compress the bird platen 20, and in principle, any way that can achieve compression of the bird platen 20 by the nut 50 may be used in the present embodiment.

The manner of fixing the screw 30 to the table in the present embodiment may be any conventional fixing manner as long as the screw 30 and the table can be fixed. In order to facilitate the detachment of the screw rod 30 from the workbench after the use of the pressing plate assembly, the pressing plate assembly of the embodiment further comprises a T-shaped screw seat 10 besides the bird-shaped pressing plate 20, the screw rod 30 and the nut 50 matched with the screw rod 30, a T-shaped groove with a narrow top and a wide bottom is arranged on the workbench, the T-shaped groove is fixedly provided with the T-shaped screw seat 10, the middle part of the T-shaped screw seat 10 is provided with a threaded hole, and the bottom end of the screw rod 30 is inserted into the T-shaped screw seat 10 and is in threaded connection with the threaded hole.

As shown in fig. 7, the middle portion of the bird-shaped pressing plate 20 is a cavity 21, the threaded section of the screw 30 passes through the cavity 21, and after the nut 50 presses the workpiece, the nut 50 is wholly or partially located in the cavity 21. This embodiment sets up cavity 21 in the middle part of bird type clamp plate 20, can effectively reduce the length of screw rod 30, and through setting up cavity 21 in the middle part of bird type clamp plate, the stress point on the bird type clamp plate 20 moves down after nut 50 compresses tightly, and it is better to compress tightly the effect.

In this embodiment, it is preferable that the platen assembly includes: the bird-shaped pressing plate 20, the screw 30, the nut 50 matched with the screw 30 and the hemispherical washer 40 placed in the cavity 21, wherein the screw 30 penetrates through the hemispherical washer 40, the peripheral wall of the hemispherical washer 40 is contacted with the inner wall of the cavity 21, the nut 50 is positioned above the hemispherical washer 40, and the lower surface of the nut 50 is contacted with the upper surface of the hemispherical washer 40. The purpose of the hemispherical washer 40 provided in this embodiment is to ensure that the height of the bird-shaped pressing plate 20 can be freely adjusted, and the bird-shaped pressing plate is suitable for clamping workpieces with different heights. As shown in fig. 6, the hemispherical washer 40 is provided with a screw hole, and the screw hole is threadedly engaged with the screw 30. Preferably, the upper surface of the hemispherical washer 40 is spaced 20mm from the center of the sphere. The distance from the upper surface of the hemispherical washer 40 to the center of the sphere is controlled in the embodiment, on one hand, the depth of the inner cavity is controlled, and the strength and the rigidity of the bird-shaped pressing plate 20 are ensured; on the other hand, under the condition that the hemispherical washer 40 is matched with the inner cavity, the pressure center exerted by the nut 50 acts on the bird-shaped pressing plate 20, and the gravity center of the bird-shaped pressing plate 20 moves downwards.

In the present embodiment, the upper surface of the hemispherical washer 40 is a flat surface, and the nut 50 is in contact with the upper surface of the hemispherical washer 40. In the embodiment, the upper surface of the hemispherical washer 40 is set to be a plane, and the plane increases the contact area between the lower surface of the nut 50 and the hemispherical washer 40, so that the compression stability is better. Part of the peripheral wall of the inner cavity is an arc-shaped surface which is matched with the spherical surface of the hemispherical washer 40. In this embodiment, an arc-shaped surface is disposed on the peripheral wall of the inner cavity, and the arc-shaped surface is used for accommodating the hemispherical washer 40, so that the hemispherical washer 40 is in closer contact with the inner cavity.

In actual use, the nut 50 of this embodiment is fitted with a flat washer of appropriate thickness prior to tightening to prevent the nut 50 from interfering with the bird platen 20 during tightening of the nut 50. Therefore, a washer is preferably further provided between the nut 50 and the hemispherical washer 40, and the washer is sleeved on the screw 30.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A clamping method for thin workpieces, comprising the steps of:

placing a workpiece on a workbench (5) with a T-shaped groove;

placing a positioning piece (200) at one side of the workpiece, and tightly attaching one side wall of the workpiece to the positioning piece (200), wherein the positioning piece (200) realizes positioning at one side of the workpiece;

the hook head seat (1) is fixed nearby at the other side of the workpiece, the top shaft penetrates through the hook head seat (1) to tightly push against the other opposite side wall of the workpiece, and the workpiece is clamped through the positioning piece (200) and the top shaft (2);

the hook head seat (1) is composed of a hook head (12) and a seat body (11), the seat body (11) is located above the hook head (12), the bottom surface of the seat body (11) is in contact with the table top of the workbench (5), the head of the hook head (12) is arranged at the bottom of the T-shaped groove, and the upper surface of the head is in contact with the step surface of the T-shaped groove;

a fulcrum is formed between the upper surface of the hook head (12) and an external corner in the T-shaped groove, and the junction of the hook head (12) and the seat body (11) is abutted against the convex edge of the notch of the T-shaped groove to form another fulcrum; after the workpiece (4) applies a counterforce to the base body (11), the two supporting points enable the hook head (12) to be connected with the workbench (5) more tightly.

2. Clamping method according to claim 1, characterized in that the hook base (1) is fixed in such a way that: the hook head seat (1) is inserted into the T-shaped groove.

3. The clamping device suitable for the thin workpiece is characterized by comprising a positioning piece (200) and a clamping tool (100), wherein the positioning piece (200) is fixed on a workbench, the positioning piece (200) and the clamping tool (100) are placed on two opposite sides of the workpiece, and the workpiece is placed in a manner of being tightly attached to the positioning piece (200);

the clamping tool (100) comprises a hook head seat (1) and a jacking shaft (2) for jacking a workpiece (4), the workpiece (4) is placed on a workbench (5) with a T-shaped groove, and one side of the workpiece (4) is positioned;

the hook head (12) of the hook head seat (1) is placed in the T-shaped groove, the jacking shaft (2) penetrates through the hook head seat (1) and jacks the other side of the workpiece (4) tightly, so that the workpiece (4) is clamped, and the reaction force of the workpiece (4) on the hook head seat (1) enables the hook head (12) to be connected with the workbench (5) more tightly;

4. The clamping device as claimed in claim 3, characterized in that the jackscrew is arranged on the jackshaft (2), the hook head seat (1) is provided with a threaded hole matched with the jackscrew, and the jackscrew is screwed against the workpiece (4).

5. Clamping device according to claim 4, characterized in that the axis of the threaded hole forms an angle of 15 ° -25 ° with the upper surface of the table (5).

6. Clamping device according to claim 5, characterized in that the threaded hole opens out in the seat (11) of the hook head seat (1).

7. The clamping device according to claim 4, characterized in that a certain distance is provided between the workpiece (4) and the hook head seat (1), a top block (3) is placed between the workpiece (4) and the hook head seat (1), and the top shaft (2) penetrates through the hook head seat (1) to abut against the top block (3) so as to clamp the workpiece (4).