Circumferential cutting clamp and linear cutting machine tool

Abstract

The invention relates to the field of clamps, and provides a circumferential cutting clamp and a linear cutting machine tool. The circumferential cutting clamp comprises a support used for being connected with a linear cutting machine tool; the fixing device is used for fixing the reserved part of the blank to be cut; the number of the connecting pieces is at least two, one end of each connecting piece is rotationally connected with the support, the other end of each connecting piece is rotationally connected with the fixing device, the rotating axes of the two ends of each connecting piece are coaxial, and a bent structure is arranged between the two ends of each connecting piece. The at least two connecting pieces which are arranged to be of the bent structures are rotationally connected between the fixing device and the support, so that the position of the fixing device can be fixed, the inward concave direction of the bent structures can be changed, the avoiding effect is formed on the electrode wire, and the electrode wire can conduct circumferential cutting on the workpiece. The workpiece is fixed through the fixing device, even if the workpiece is separated from the rim charge, the position of the workpiece can be kept fixed so that the workpiece can be cut for multiple times, and the precision and roughness of the workpiece can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of jigs, and particularly to a circumferential cutting jig and a wire cutting machine tool. Background Art

[0002] Wire cut Electrical Discharge Machining (WEDM) is a kind of special machining. It uses a continuously moving thin metal wire (called the electrode wire) as the electrode to perform pulsed spark discharge on the workpiece to erode the metal and cut into shape. The wire cut electrical discharge machining technology mainly uses electrical energy to process materials, is not limited by the material properties, and can conveniently process materials with high hardness, high strength and high brittleness.

[0003] For the form of machining through holes or through slots on parts, wire cutting can be well completed. However, in some machining tasks, as shown in Figure 1 , it is necessary to retain the material inside the blank as the workpiece and perform 360° cutting on the side material outside the workpiece, such as the punch of a stamping die. In order to ensure the accuracy and roughness of the outer side wall of the workpiece, generally, a process of cutting once and trimming three times is required, that is, the outer side wall of the workpiece needs to be cut multiple times to meet the accuracy and roughness requirements. In order to prevent the workpiece from shifting relative to the side material during the machining process, a connecting part is usually left between the workpiece and the side material. After the side wall of the workpiece is trimmed, the connecting part is then cut off.

[0004] Since the workpiece falls off after the connecting part is cut off, it is impossible to trim the connecting part of the workpiece anymore, resulting in the roughness and accuracy of the connecting part of the workpiece not meeting the requirements. Moreover, when the workpiece falls off, it is easy to clamp and break the electrode wire or the workpiece is cut off. Summary of the Invention

[0005] The present invention provides a circumferential cutting jig and a wire cutting machine tool to solve the defect that the workpiece will fall off after the connecting part is cut off in the prior art, and achieve the effect of preventing the workpiece from falling off after the connecting part is cut off.

[0006] The present invention provides a circumferential cutting jig, including:

[0007] A support, which is used to connect with the wire cutting machine tool;

[0008] A fixing device, which is used to fix the reserved part of the blank to be cut;

[0009] Connecting piece, the number of the connecting pieces is set to be at least two, one end of each connecting piece is rotatably connected to the support, the other end is rotatably connected to the fixing device, the rotation axes at both ends of the connecting piece are coaxial, and a bending structure is arranged between both ends of the connecting piece, and the bending structure deviates from the rotation axis of the connecting piece.

[0010] According to a circumferential cutting fixture provided by the present invention, the fixing device includes a mounting seat and a connecting component, the mounting seat is connected to the connecting piece, and the connecting component is used for fixing the remaining part to the mounting seat.

[0011] According to a circumferential cutting fixture provided by the present invention, the connecting component includes a threaded pressing piece, the threaded pressing piece is threadedly connected to the mounting seat, and the threaded pressing piece is used to abut against the remaining part to press the remaining part against the mounting seat;

[0012] Alternatively, the connecting component includes a magnetic head, and the magnetic head is used to magnetically attract the remaining part;

[0013] Alternatively, the connecting component includes a suction cup, and the suction cup is used to adsorb the remaining part.

[0014] According to a circumferential cutting fixture provided by the present invention, the support, the connecting piece and the mounting seat are all made of conductive materials.

[0015] According to a circumferential cutting fixture provided by the present invention, it further includes a driving component, the driving component is arranged on the support and connected to the connecting piece to drive the connecting piece to rotate.

[0016] According to a circumferential cutting fixture provided by the present invention, the driving component includes a driven wheel and a driving part, the driven wheels are connected to the connecting pieces in a one-to-one correspondence, the driving part is arranged on the support, the driving part is in transmission connection with all the driven wheels, and is used to drive all the driven wheels to rotate in the same direction.

[0017] According to a circumferential cutting fixture provided by the present invention, the driving part is set as a driving wheel, the driving wheel is rotatably connected to the support, and the driving component further includes a driving motor, and an output shaft of the driving motor is connected to the driving wheel.

[0018] According to a circumferential cutting fixture provided by the present invention, the driving part is set as a driving wheel, the driving wheel is rotatably connected to the support, and the driving component further includes a hand wheel, the hand wheel is connected to the driving wheel, and a locking structure is arranged between the support and the driving wheel or between the support and the hand wheel, and the locking structure is used to lock or unlock the driving wheel or the hand wheel.

[0019] According to a circumferential cutting fixture provided by the present invention, the active component is set as a rack, the rack is slidably arranged on the support, and the driven wheel is set as a gear meshing with the rack.

[0020] The present invention also provides a wire cutting machine tool, including the circumferential cutting fixture as described above.

[0021] The circumferential cutting fixture provided by the present invention can be connected to a wire cutting machine tool by setting a support, and the remaining part of the blank to be cut, that is, the workpiece, can be fixed by a fixing device. The support and the fixing device are connected by at least two connecting pieces, and the rotation axes at both ends of the connecting pieces are coaxial. During the rotation of the connecting pieces, the fixing device will not move in position, ensuring that the blank on the fixing device remains in a fixed position during the cutting process, thereby ensuring the cutting accuracy.

[0022] By setting the connecting piece as a bent structure, and the bent structure deviates from the rotation axis of the connecting piece. At the beginning of cutting, the concave part of the connecting piece can be made to face the first direction, and then the electrode wire of the wire cutting machine tool is gradually cut outwards from the concave part of the connecting piece. After the electrode wire runs outside the rotation range of the connecting piece, rotate the connecting piece and make the concave part of the connecting piece face the second direction, so that the electrode wire returns to the concave part of the connecting piece from the second direction, making the running path of the electrode wire closed, and completing a 360-degree circumferential cutting of the workpiece.

[0023] With such a setting, the circumferential cutting fixture provided by the present invention can be connected to a wire cutting machine tool through the support. At least two connecting pieces set as bent structures are rotatably connected between the fixing device and the support, which can not only fix the position of the fixing device, but also change the concave direction of the bent structure to form an avoidance effect on the electrode wire, so that the electrode wire can perform 360-degree circumferential cutting on the workpiece. The workpiece is fixed by the fixing device, and even if the workpiece is separated from the side material, the position of the workpiece can still be fixed, which is convenient for cutting the workpiece multiple times and ensuring the accuracy and roughness of the workpiece.

[0024] The wire cutting machine tool provided by the present invention includes all the above advantages of the circumferential cutting fixture because it includes the circumferential cutting fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of cutting a blank by a wire cutting machine tool in the prior art to form a workpiece;

[0027] Figure 2 is a schematic diagram of the working state of the circumferential cutting fixture provided in some embodiments of the present invention;

[0028] Figure 3 is a schematic structural diagram of the circumferential cutting fixture provided with a threaded pressing member in some embodiments of the present invention;

[0029] Figure 4 is a schematic structural diagram of the circumferential cutting fixture provided with a magnetic head in some embodiments of the present invention;

[0030] Figure 5 is a schematic structural diagram of the circumferential cutting fixture provided with a suction cup in some embodiments of the present invention.

[0031] Reference numerals:

[0032] 1, support; 2, fixing device; 201, mounting seat; 202, connecting component; 202a, threaded pressing member; 202b, magnetic head; 202c, suction cup; 3, connecting piece; 4, driving component; 401, driven wheel; 402, driving wheel; 403, hand wheel; 5, blank; 501, reserved part; 502, scrap; 6, electrode wire. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts fall within the scope of protection of the present invention.

[0034] The following will be combined with Figures 2 to 5 to describe the circumferential cutting fixture provided in the embodiments of the present invention.

[0035] Specifically, the circumferential cutting fixture includes a support 1, a fixing device 2 and a connecting piece 3.

[0036] Among them, the support 1 is used to connect with the wire cutting machine tool. Specifically, the support 1 is arranged on the workbench of the wire cutting machine tool. Optionally, the support 1 is connected to the wire cutting machine tool through the connecting piece 3, or the support 1 is welded to the wire cutting machine tool.

[0037] The fixing device 2 is used to fix the reserved part 501 of the blank 5 to be cut, and the reserved part 501 is the workpiece, that is, the fixing device 2 is used to fix the workpiece after cutting. The part of the blank 5 to be cut is the scrap 502.

[0038] The number of the connecting pieces 3 is set to at least two, for exampleFigures 2 - 5 Shown is an example where the number of the connecting members 3 is set to two. One end of each of the connecting members 3 is rotatably connected to the support 1, and the other end is rotatably connected to the fixing device 2, and the rotation axes at both ends of the connecting member 3 are coaxial. Optionally, pivot shafts are fixedly provided at both ends of the connecting member 3, and the pivot shafts at both ends of the connecting member 3 are coaxially arranged. The pivot shaft at the first end of the connecting member 3 is rotatably connected to the support 1, and the pivot shaft at the second end of the connecting member 3 is rotatably connected to the fixing device 2.

[0039] A bent structure is provided between both ends of the connecting member 3, and the bent structure deviates from the rotation axis of the connecting member 3. Optionally, the connecting member 3 is provided as an arc-shaped structure, or the connecting member 3 is provided as a U-shaped structure. Optionally, the connecting member 3 is provided as a sheet metal integral structure, a welded integral structure, a cast integral structure or a forged integral structure.

[0040] In the circumferential cutting fixture provided in the embodiment of the present invention, by providing the support 1, it can be connected to the wire cutting machine tool, and by the fixing device 2, the reserved part 501 of the blank 5 to be cut, that is, the workpiece, can be fixed. At least two connecting members 3 connect the support 1 and the fixing device 2, and the rotation axes at both ends of the connecting member 3 are coaxial, so that during the rotation of the connecting member 3, the fixing device 2 will not move in position, ensuring that the blank 5 on the fixing device 2 remains fixed in position during the cutting process, thereby ensuring the cutting accuracy.

[0041] By setting the connecting member 3 as a bent structure and the bent structure deviating from the rotation axis of the connecting member 3, at the beginning of cutting, the concave portion of the connecting member 3 can be made to face the first direction, and then the electrode wire 6 of the wire cutting machine tool can be gradually cut outwards from the concave portion of the connecting member 3. After the electrode wire 6 runs outside the rotation range of the connecting member 3, rotate the connecting member 3 and make the concave portion of the connecting member 3 face the second direction, so that the electrode wire 6 returns from the second direction to the concave portion of the connecting member 3, making the running path of the electrode wire 6 closed, and completing 360-degree circumferential cutting of the workpiece, avoiding interference of the connecting member 3 with the electrode wire 6. For example, the included angle between the first direction and the second direction is 180 degrees.

[0042] With such a setting, the circumferential cutting fixture provided in the embodiment of the present invention can be connected to the wire cutting machine tool through the support 1. At least two connecting members 3 provided as bent structures are rotatably connected between the fixing device 2 and the support 1, which can not only fix the position of the fixing device 2, but also change the concave direction of the bent structure to form an avoidance effect on the electrode wire 6, so that the electrode wire 6 can perform 360-degree circumferential cutting on the workpiece. By fixing the workpiece through the fixing device 2, even if the workpiece is separated from the side material 502, the position of the workpiece can still be fixed, facilitating multiple cutting of the workpiece and ensuring the accuracy and roughness of the workpiece.

[0043] Reference Figure 2 andFigure 3 As shown, optionally, all the connecting members 3 are arranged in sequence along the height direction of the support 1. Of course, all the connecting members 3 can also be arranged in sequence along the horizontal direction.

[0044] In some embodiments provided by the present invention, the fixing device 2 includes a mounting base 201 and a connecting assembly 202.

[0045] Among them, the mounting base 201 is connected to the connecting member 3, and the connecting assembly 202 is used to fix the remaining part 501 to the mounting base 201. Optionally, the mounting base 201 is used to be arranged at the bottom of the remaining part 501 for supporting the remaining part 501 and fixing the remaining part 501 through the connecting assembly 202. Or, in other embodiments, the mounting base 201 can also be arranged above the remaining part 501 and the remaining part 501 is lifted through the connecting assembly 202.

[0046] With such a setting, the use mode of the fixing device 2 is more flexible, and the fixing form of the fixing device 2 for the workpiece can be set according to actual needs.

[0047] In some embodiments provided by the present invention, with reference to Figure 3 As shown, the connecting assembly 202 includes a threaded pressing member 202a. The threaded pressing member 202a is threadedly connected to the mounting base 201, and the threaded pressing member 202a is used to abut against the remaining part 501 to press the remaining part 501 against the mounting base 201. With such a setting, the structure of the connecting assembly 202 is simple, the cost is low, and it has an anti-loosening effect.

[0048] Optionally, the threaded pressing member 202a includes a screw rod, the rod part of the screw rod passes through the through hole on the remaining part 501 and is threadedly connected to the mounting base 201, and the head of the screw rod is used to press the workpiece. Or, the threaded pressing member 202a includes a nut, a stud is provided on the mounting base 201, the stud passes through the through hole of the remaining part 501 and extends out, and the nut is threadedly connected to the stud and presses the remaining part 501 of the blank 5.

[0049] Of course, the connecting assembly 202 is not limited to the above-mentioned threaded pressing member 202a. For example, in other embodiments provided by the present invention, the connecting assembly 202 includes a magnetic head 202b, and the magnetic head 202b is used to magnetically attract the remaining part 501. The principle of the magnetic base can refer to the magnetic lifting tool or magnetic base in the prior art. With such a setting, the connecting assembly 202 can magnetically fix the remaining part 501 without a through hole.

[0050] Optionally, the magnetic head 202b can be connected to the mounting base 201 through the connecting member 3.

[0051] Of course, the connecting component 202 is not limited to the above magnetic head 202b. For example, in other embodiments provided by the present invention, the connecting component 202 includes a suction cup 202c. The suction cup 202c is used to adsorb and retain the part 501. The principle of the suction cup 202c can refer to a vacuum suction cup 202c or a vacuum lifting device. With such a setting, the connecting component 202 can adsorb and fix the retained part 501 without through holes.

[0052] In some embodiments provided by the present invention, the support 1, the connecting member 3, and the mounting base 201 are all made of conductive materials.

[0053] Since wire cutting is a processing method that melts and evaporates the metal material between the electrode wire 6 and the workpiece by using electric spark power generation to achieve cutting, the electrode wire 6 and the workpiece are electrified. By setting the support 1, the connecting member 3, and the mounting base 201 as conductive materials, the current of the workbench can be transmitted to the blank 5 through the support 1, the connecting member 3, and the mounting base 201, without being conducted to the workbench through a wire, reducing the use of wires and making the structure of the peripheral cutting fixture simple and compact.

[0054] Specifically, for the connecting member 3 in the form of a threaded pressing member 202a, the blank 5 can directly contact the mounting base 201. For the connecting member 3 in the form of a magnetic head 202b or a suction cup, the blank 5 can be connected to the mounting base 201 through a wire. Compared with the blank 5 directly connected to the workbench, the length of the wire can still be reduced.

[0055] In some embodiments provided by the present invention, the peripheral cutting fixture further includes a driving component 4.

[0056] The driving component 4 is arranged on the support 1 and connected to the connecting member 3 to drive the connecting member 3 to rotate. In this embodiment, by setting the driving component 4, it is convenient to drive the connecting member 3. For example, the driving component 4 includes a motor connected to the connecting member 3 one by one, or the driving component 4 includes a handwheel 403 connected to the connecting member 3 one by one. In this way, the corresponding connecting member 3 can be driven by the motor or the handwheel 403.

[0057] Of course, the driving component 4 is not limited to the above-mentioned motor or handwheel 403 connected to the connecting member 3 one by one. In other embodiments provided by the present invention, the driving component 4 includes a driven wheel 401 and a driving member. Among them, the driven wheel 401 is connected to the connecting member 3 one by one, the driving member is arranged on the support 1, and the driving member is in transmission connection with all the driven wheels 401 and is used to drive all the driven wheels 401 to rotate in the same direction.

[0058] In this embodiment, by drivingly connecting the active component to all the driven wheels 401, the active component can drive all the driven wheels 401 to rotate simultaneously, so as to drive all the connecting members 3 to rotate simultaneously to change the concave direction of the connecting members 3, without rotating each connecting member 3 sequentially, making the operation simpler and faster.

[0059] In some embodiments provided by the present invention, the active component is arranged as a rack, the rack is slidably arranged on the support 1, the driven wheels 401 are arranged as gears meshing with the rack, and all the driven wheels 401 are meshed with the rack. In this way, by sliding the gears, all the connecting members 3 can be driven to rotate in the same direction. Further, the driving assembly 4 further includes a cylinder or an oil cylinder, the cylinder body of the cylinder or the oil cylinder is connected to the support 1, and the piston rod is connected to the rack to drive the rack to reciprocate, so as to change the concave orientation of the connecting member 3. In this way, the labor intensity of the operator can be reduced, and in addition, the manual participation can be reduced to realize the automatic cutting of wire cutting.

[0060] Of course, the active component is not limited to the rack. For example, in other embodiments provided by the present invention, the active component is arranged as a driving wheel 402. The driving wheel 402 is rotatably connected to the support 1. By rotating the driving wheel 402, all the driven wheels 401 can be driven to rotate in the same direction. For example, both the driving wheel 402 and the driven wheels 401 are arranged as gears and are in meshing transmission. Or, both the driving wheel 402 and the driven wheels 401 are arranged as sprockets and are driven by a chain. Or, both the driving wheel 402 and the driven wheels 401 are arranged as synchronous belt wheels and are driven by a synchronous belt.

[0061] Optionally, the driving assembly 4 further includes a driving motor. The output shaft of the driving motor is connected to the driving wheel 402. In this embodiment, the driving motor drives the driving wheel 402 to rotate, so as to drive all the driven wheels 401 to rotate through the driving wheel 402. In this way, the labor intensity of the operator can be reduced, and in addition, the manual participation can be reduced to realize the automatic cutting of wire cutting.

[0062] Of course, the driving assembly 4 is not limited to driving the driving wheel 402 to rotate through a driving motor. For example, in other embodiments provided by the present invention, the driving assembly 4 further includes a handwheel 403, and the handwheel 403 is connected to the driving wheel 402. In this embodiment, the operator can drive the driving wheel 402 to rotate through the handwheel 403 to achieve the effect of manually adjusting the concave orientation of the connecting member 3.

[0063] In some embodiments provided by the present invention, a locking structure is provided between the support 1 and the driving wheel 402 or between the support 1 and the handwheel 403, and the locking structure is used to lock or unlock the driving wheel 402 or the handwheel 403.

[0064] In this embodiment, when the connecting member 3 rotates such that its concave portion faces the first direction, the handwheel 403 or the driving wheel 402 can be locked by a locking structure. When the connecting member 3 rotates such that its concave portion faces the second direction, the handwheel 403 or the driving wheel 402 can be locked by the locking structure, so as to reduce the problem that the connecting member 3 rotates due to its own weight or accidental touch during the cutting process.

[0065] In some embodiments provided by the present invention, the locking structure includes an elastic protrusion and a groove. Taking the handwheel 403 as an example for introduction, the driving wheel 402 is the same. One of the handwheel 403 and the support 1 is provided with an elastic protrusion, and the other is provided with a groove for the elastic protrusion to extend into. When the handwheel 403 rotates until the elastic protrusion is placed in the groove, the elastic protrusion and the groove form a snap connection. At this time, the handwheel 403 will no longer rotate. When the operator applies an external force to overcome the snap force between the elastic protrusion and the groove, the handwheel 403 can rotate again. Optionally, the elastic protrusion is a rubber structure or a ball plunger.

[0066] Of course, the locking structure is not limited to the elastic protrusion and the groove. For example, the locking structure can also be a bolt. Taking the handwheel 403 as an example for introduction, the driving wheel 402 is the same. One of the handwheel 403 and the support 1 is provided with a slidable bolt, and the other is provided with a positioning hole for the bolt to insert into.

[0067] In some embodiments provided by the present invention, under the condition that the support 1 is made of a conductive material, in order to avoid electric shock to the operator, at least the part of the handwheel 403 for the user to hold is made of an insulating material.

[0068] An embodiment of the present invention also provides a wire cutting machine tool.

[0069] Specifically, the wire cutting machine tool includes the circumferential cutting fixture as described above.

[0070] It should be noted that since the wire cutting machine tool includes the circumferential cutting fixture, it also includes all the above advantages of the circumferential cutting fixture, which will not be elaborated here.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circumferential cutting fixture, characterized in that, it includes: a support (1) for connecting with a wire cutting machine tool; a fixing device (2) for fixing the reserved part (501) of the blank (5) to be cut; a connecting member (3), the number of the connecting members (3) is set to be at least two, one end of each connecting member (3) is rotatably connected to the support (1), and the other end is rotatably connected to the fixing device (2). The rotation axes at both ends of the connecting member (3) are coaxial, and a bent structure is arranged between both ends of the connecting member (3), and the bent structure deviates from the rotation axis of the connecting member (3).

2. The circumferential cutting fixture according to claim 1, characterized in that, the fixing device (2) includes a mounting seat (201) and a connecting assembly (202). The mounting seat (201) is connected to the connecting member (3), and the connecting assembly (202) is used to fix the reserved part (501) to the mounting seat (201).

3. The circumferential cutting fixture according to claim 2, characterized in that, the connecting assembly (202) includes a threaded pressing member (202a) which is threadedly connected to the mounting seat (201), and the threaded pressing member (202a) is used to abut against the reserved part (501) to press the reserved part (501) against the mounting seat (201); alternatively, the connecting assembly (202) includes a magnetic head (202b) for magnetically attracting the reserved part (501); alternatively, the connecting assembly (202) includes a suction cup (202c) for sucking the reserved part (501).

4. The circumferential cutting fixture according to claim 2, characterized in that, the support (1), the connecting member (3) and the mounting seat (201) are all made of conductive materials.

5. The circumferential cutting fixture according to any one of claims 1-4, characterized in that, it further includes a driving assembly (4). The driving assembly (4) is arranged on the support (1) and connected to the connecting member (3) to drive the connecting member (3) to rotate.

6. The circumferential cutting fixture according to claim 5, characterized in that, the driving assembly (4) includes a driven wheel (401) and a driving member. The driven wheel (401) is connected to the connecting member (3) in a one-to-one correspondence. The driving member is arranged on the support (1), and the driving member is in transmission connection with all the driven wheels (401) and is used to drive all the driven wheels (401) to rotate in the same direction.

7. The circumferential cutting fixture according to claim 6, characterized in that, the driving member is set as a driving wheel (402) which is rotatably connected to the support (1). The driving assembly (4) further includes a driving motor, and the output shaft of the driving motor is connected to the driving wheel (402).

8. The circumferential cutting fixture according to claim 6, characterized in that, The active component is set as the driving wheel (402), the driving wheel (402) is rotatably connected to the support (1), the driving assembly (4) further includes a hand wheel (403), the hand wheel (403) is connected to the driving wheel (402), and a locking structure is provided between the support (1) and the driving wheel (402) or between the support (1) and the hand wheel (403), and the locking structure is used to lock or unlock the driving wheel (402) or the hand wheel (403).

9. The circumferential cutting fixture according to claim 6, characterized in that the active component is set as a rack, the rack is slidably arranged on the support (1), and the driven wheel (401) is set as a gear meshing with the rack.

10. A wire cutting machine tool, characterized in that it includes the circumferential cutting fixture according to any one of claims 1-9.

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