A kind of ring groove processing equipment
Patent Information
- Application Number
- CN202522476718.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-21
AI Technical Summary
Existing wire EDM equipment is difficult to process rotating surfaces such as annular grooves, conical surfaces, and irregular curved surfaces efficiently and accurately, especially for large bars, where the processing accuracy and efficiency are low.
By employing a wire cutting structure and a rotating mechanism, the relative movement of the cutting line and the workpiece, combined with a lifting mechanism and chuck clamping, enables the workpiece to rotate 360° and the cutting line to reciprocate, ensuring the continuity and uniformity of the cutting process.
It improves the cutting efficiency and accuracy of ring groove machining, avoids the impact of intermittent cutting on tool life, and ensures the stability and uniformity of the machining process.
Smart Images
Figure CN224927141U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of annular groove processing technology, specifically to annular groove processing equipment, and more particularly to a high-efficiency processing equipment for processing annular grooves from large-sized bars. Background Technology
[0002] Most wire EDM equipment currently in use employs a lifting feed of the cutting wire to cut the workpiece. The workpiece is typically in a fixed position, and two-dimensional contour cutting is achieved solely through the movement of the XY plane of the worktable. This design is suitable for slicing workpieces, but it becomes difficult to machine surfaces of revolution (such as annular grooves, conical surfaces, and irregular curved surfaces). If the cutting position is adjusted by interrupting the feed, it not only reduces production efficiency but also machining accuracy. This is especially true when machining annular grooves from large bar stock, where adjusting the cutting position is extremely difficult while maintaining machining accuracy. Utility Model Content
[0003] To address the shortcomings of the existing technology, this utility model provides a ring groove processing equipment that can meet the requirements of cutting ring grooves from high-hardness bar stock, and has high processing accuracy.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A ring groove processing device includes a frame, a wire cutting structure, a rotating mechanism, and a control box;
[0006] The wire cutting structure is installed on the upper part of the frame. The wire cutting structure includes a first cutting wheel, a cutting wire, a take-up and unwinding mechanism, and a second cutting wheel. The take-up and unwinding mechanisms are respectively provided on the left and right sides of the frame. The first cutting wheel and the second cutting wheel are horizontally spaced apart at the front end of the middle part of the frame. The cutting wire on the take-up and unwinding mechanism on one side passes around the first cutting wheel and the second cutting wheel and then winds around the take-up and unwinding mechanism on the other side. The cutting wire between the first cutting wheel and the second cutting wheel is in a horizontal straight line state. The take-up and unwinding mechanisms on both sides are respectively connected to the control box, and take up and unwind the wire alternately under the control of the control box.
[0007] The rotating mechanism includes a second motor and a chuck; the output shaft of the second motor is horizontal, and the chuck is centrally mounted at the end of the output shaft. The chuck is used to clamp the workpiece, and the workpiece axis is perpendicular to the cutting line between the first cutting wheel and the second cutting wheel; the second motor drives the chuck and the workpiece to rotate 360°.
[0008] The first cutting wheel and the second cutting wheel are mounted on the lifting mechanism, or the rotating mechanism is mounted on the lifting mechanism; the processing equipment uses the lifting mechanism to make the cutting line between the first cutting wheel and the second cutting wheel cut the workpiece.
[0009] Furthermore, the rotation direction of the workpiece is opposite to the movement direction of the cutting line.
[0010] Furthermore, the lifting mechanism is a workpiece lifting mechanism, which includes a support frame, a first motor, a first motor mounting base, a drive wheel, a synchronous belt, a driven wheel, a lifting frame, a lead screw mounting base, a support column, and a lead screw;
[0011] Below the cutting line, the support frame is mounted on the machine frame; the first motor is mounted on the rear side of the support frame via a first motor mounting seat and is connected to the control box; the output shaft of the first motor is in a vertical position, the driving wheel is mounted on the output shaft of the first motor, and the driving wheel is connected to the driven wheel located on the lower inner side of the support frame via the synchronous belt; the driven wheel is mounted on the end of the lead screw; the lead screw is in a longitudinal position inside the support frame, and both ends of the lead screw are connected to the support frame via lead screw mounting seats; the lifting frame is threadedly connected to the lead screw via a lead screw nut; the support column is coaxially mounted on the top of the lifting frame, and the workpiece is mounted on the top of the support column via the rotating mechanism.
[0012] Furthermore, the workpiece lifting mechanism also includes guide rails and sliders; two guide rails are longitudinally and symmetrically installed on both sides of the front end of the support frame; the left and right sides of the lifting frame are respectively slidably installed on the guide rails via the sliders.
[0013] Furthermore, the workpiece lifting mechanism also includes a lower limit switch and an upper limit switch; at the upper and lower ends of the two guide rails, the upper limit switch and the lower limit switch are respectively installed on the support frame, and the upper limit switch and the lower limit switch are respectively connected to the control box.
[0014] Furthermore, the rotating mechanism also includes a second motor mounting base; the second motor is mounted on the top of the support column via the second motor mounting base.
[0015] Furthermore, the wire cutting structure also includes a guide wheel; the first cutting wheel, the guide wheel, and the second cutting wheel are arranged in a triangular shape at the front end of the middle part of the frame; the cutting wire released by the wire take-up and release mechanism on one side forms a ring cutting wire around the first cutting wheel, the guide wheel, and the second cutting wheel, and then wraps around the second cutting wheel and onto the wire take-up and release mechanism on the other side.
[0016] Furthermore, the wire cutting structure also includes guide wheels, a wire cutting lifting system, and steering guide wheels; two steering guide wheels are symmetrically arranged on the left and right front ends of the frame; at the front end of the middle of the frame, the first cutting wheel and the second cutting wheel are symmetrically arranged on the wire cutting lifting system, and two guide wheels are symmetrically arranged on the wire cutting lifting system on the outer sides of the first cutting wheel and the second cutting wheel, and the axes of the first cutting wheel, the second cutting wheel, and the guide wheels are flush;
[0017] The cutting line released from the take-up and release mechanism on one side is turned by the steering guide wheel and then passes around the first guide wheel, the first cutting wheel, the second cutting wheel and the second guide wheel in sequence. It is then turned by the steering guide wheel on the other side and wrapped around the take-up and release mechanism on the other side.
[0018] Furthermore, the frame is also provided with one or more support seats; the support seats are coaxially located below the workpiece.
[0019] Furthermore, the support base has V-shaped blocks symmetrically arranged on both sides of its top end, and rollers are provided on the inclined surface of the V-shaped blocks; the support base supports the workpiece through the V-shaped blocks.
[0020] The beneficial effects of this utility model are:
[0021] The ring groove processing equipment provided by this utility model can perform 360° rotation of the workpiece while cutting it online. This not only realizes the processing of the ring groove of the workpiece, but also ensures that the processing process is continuous and the processing load is uniform, thereby improving the cutting efficiency and cutting accuracy and avoiding the impact of intermittent cutting on the tool life.
[0022] This invention uses a chuck to clamp the workpiece and a motor to drive the workpiece to rotate continuously 360° to process the annular groove on the workpiece. By moving the cutting line in the opposite direction to the workpiece's rotation, the cutting force is increased and the cutting efficiency is improved.
[0023] This invention supports the workpiece with a V-shaped block equipped with rollers, which not only supports the workpiece and ensures that its axial direction does not deviate during rotation, thus increasing the stability of the equipment and facilitating the processing of larger workpieces, but also does not increase rotational resistance. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the annular groove processing equipment according to Embodiment 1 of this utility model;
[0025] Figure 2 This is a schematic diagram of the lifting mechanism and the rotating mechanism in Embodiment 1 of this utility model;
[0026] Figure 3This is a schematic diagram of the annular groove processing equipment according to Embodiment 2 of this utility model.
[0027] The components are as follows: 1-Frame, 2-Workpiece lifting mechanism, 2.1-Support frame, 2.2-First motor, 2.3-First motor mounting base, 2.4-Drive wheel, 2.5-Synchronous belt, 2.6-Lower limit switch, 2.7-Guide rail, 2.8-Slider, 2.9-Lifting frame, 2.10-Screw mounting base, 2.11-Upper limit switch, 2.12-Support column, 3-Rotating mechanism, 3.1-Second motor, 3.2-Three-jaw chuck, 3.3-Second motor mounting base, 4-Workpiece, 5-First cutting wheel, 6-Cutting wire, 7-Wire take-up and unwinding mechanism, 8-Tension module, 9-Guide wheel, 10-Second cutting wheel, 11-Control box, 12-Wire laying mechanism, 13-Cutting wire lifting system, 14-Steering guide wheel, 15-Support platform. Detailed Implementation
[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of this utility model.
[0029] The terms used in this application, such as top, bottom, left, right, inside, outside, front end, rear end, head, and tail, are based on the orientations or positional relationships shown in the accompanying drawings. Different drawings may result in different positional relationships, therefore they should not be construed as limiting the scope of protection.
[0030] In this utility model, the terms "installation," "connection," "interlocking," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a connection that allows communication, a direct connection, or an indirect connection through an intermediate medium. They can also refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.
[0031] Example 1
[0032] This embodiment describes a ring groove processing device, which uses a reciprocating multi-wire cutting machine to cut ring grooves on bar stock.
[0033] like Figure 1 As shown, the processing equipment includes a frame 1, a workpiece lifting mechanism 2, a rotating mechanism 3, a first cutting wheel 5, a cutting wire 6, a wire take-up and unwinding mechanism 7, a tension module 8, a guide wheel 9, a second cutting wheel 10, and a control box 11.
[0034] The workpiece lifting mechanism 2 is installed on the frame 1, and the workpiece 4 is installed at its top via the rotating mechanism 3. The rotating mechanism 3 is used to lift and feed the workpiece 4, and drives the workpiece 4 to rotate continuously around the axis.
[0035] Above the workpiece 4, the first cutting wheel 5, guide wheel 9, and second cutting wheel 10 are arranged in a triangular pattern at the front end of the middle of the frame 1. A take-up / release mechanism 7 and a tension module 8 are provided on both the left and right sides of the frame 1. After the cutting wire 6 is released from the take-up / release mechanism 7 on the left, it passes through the tension module 8 and forms a ring-shaped cutting line around the first cutting wheel 5, the second cutting wheel 10, and the guide wheel 9, with the cutting line 6 between the first cutting wheel 5 and the second cutting wheel 10 in a horizontal straight line state. After the cutting wire 6 is wound around the second cutting wheel 10, it passes over the tension module 8 on the right and wraps around the take-up / release mechanism 7 on the right. The take-up / release mechanisms 7 on the left and right sides alternately take up and release the wire under the control of the control box 11, causing the cutting wire 6 to perform a reciprocating cutting motion. Preferably, the cutting wire 6 is wound back and forth on the first cutting wheel 5, the second cutting wheel 10, and the guide wheel 9 to form multiple ring-shaped cutting lines, i.e., forming a cutting wire mesh, which can achieve simultaneous cutting of multiple annular grooves.
[0036] In this embodiment, the cutting wire 6 can be made of diamond wire.
[0037] like Figure 2 As shown, the workpiece lifting mechanism 2 in this embodiment includes a support frame 2.1, a first motor 2.2, a first motor mounting base 2.3, a drive wheel 2.4, a synchronous belt 2.5, a driven wheel (not shown in the figure), a lower limit switch 2.6, a guide rail 2.7, a slider 2.8, a lifting frame 2.9, a lead screw mounting base 2.10, an upper limit switch 2.11, a support column 2.12, and a lead screw (not shown in the figure).
[0038] Below the annular cutting line, the support frame 2.1 is mounted on the machine frame 1, serving as the supporting foundation for the workpiece lifting mechanism 2. It has an overall U-shaped structure with an opening at the front and through openings at both the top and bottom. Two guide rails 2.7 are longitudinally and symmetrically mounted on both sides of the front end of the support frame 2.1.
[0039] The first motor 2.2 is mounted on the rear side of the support frame 2.1 via the first motor mounting base 2.3. The output shaft of the first motor 2.2 is vertical, and the driving wheel 2.4 is mounted on the output shaft of the first motor 2.2 via a key. A driven wheel is provided on the lower inner side of the support frame 2.1. A synchronous belt 2.5 is fitted onto the driving wheel 2.4 and the driven wheel. When the first motor 2.2 drives the driving wheel 2.4 to rotate, the driven wheel is driven to rotate synchronously via the synchronous belt 2.5.
[0040] Inside the support frame 2.1, both ends of the lead screw are longitudinally mounted on the inner side of the support frame 2.1 via lead screw mounting seats 2.10, and the driven wheel is connected to the end of the lead screw via a key. Preferably, the lead screw mounting seat 2.10 is provided with bearing holes, and both ends of the lead screw are connected to the lead screw mounting seat 2.10 via bearings in the bearing holes. The lifting frame 2.9 is threadedly connected to the lead screw via a lead screw nut, and the left and right sides of the lifting frame 2.9 are slidably connected to the guide rails 2.7 on both sides of the support frame 2.1 via sliders 2.8. At the upper and lower ends of the two guide rails 2.7, upper limit switches 2.11 and lower limit switches 2.6 are respectively mounted on the support frame 2.1 to monitor whether the lifting frame 2.9 has reached the limit position of its upper and lower travel, and transmit the detection signal to the control box 11. When the control box 11 detects that the lifting frame 2.9 has reached the limit position signal of its travel, it controls the first motor 2.2 to stop operating.
[0041] The support column 2.12 is coaxially mounted on the top of the lifting frame 2.9, and the workpiece 4 is mounted on the top of the support column 2.12 via the rotating mechanism 3. When the first motor 2.2 drives the lead screw to rotate via the synchronous belt drive, the lifting frame 2.9 rises and falls together with the support column 2.12 via the lead screw drive, realizing the lifting and feeding of the workpiece 4.
[0042] like Figure 2 As shown, the rotating mechanism 3 in this embodiment includes a second motor 3.1, a three-jaw chuck 3.2, and a second motor mounting base 3.3.
[0043] The second motor 3.1 is mounted on the top of the support column 2.12 via the second motor mounting base 3.3, and the output shaft of the second motor 3.1 is horizontal. The end of the output shaft of the second motor 3.1 is connected to the center of the three-jaw chuck 3.2 via a coupling. The three-jaw chuck 3.2 is used to clamp the workpiece 4. The second motor 3.1 drives the three-jaw chuck 3.2 and the workpiece 4 to rotate together, so that the cutting line 6 can perform 360° annular groove cutting on the workpiece 4. Preferably, during cutting, the rotation direction of the workpiece 4 is opposite to the movement direction of the cutting line 6, thereby speeding up the cutting speed and improving the cutting efficiency. The three-jaw chuck 3.2 can also be replaced by other multi-jaw chucks to accommodate workpieces 4 of different sizes.
[0044] In addition, one or more support seats are provided on the frame 1, and the support seats are coaxially located below the workpiece 4 to support the workpiece 4. Preferably, V-shaped blocks are symmetrically provided on both sides of the top of the support seat, and the support seat supports the workpiece 4 through the opposing inclined surfaces of the two V-shaped blocks. Rollers are symmetrically provided on the opposing inclined surfaces of the two V-shaped blocks, so that the support seat does not increase the rotational resistance of the workpiece 4 while supporting the workpiece 4.
[0045] In this embodiment, the first motor 2.2, the lower limit switch 2.6, the upper limit switch 2.11, the second motor 3.1, the take-up and untake-down mechanism 7, the tension module 8, etc. are respectively connected to the control box 11, and the control box 11 controls the coordinated operation of each component.
[0046] Example 2
[0047] This embodiment discloses a ring groove processing device, which is similar in structure to Embodiment 1, except that, as shown in the figure... Figure 3 As shown, the processing equipment includes a frame 1, a rotating mechanism 3, a first cutting wheel 5, a cutting wire 6, a wire take-up and unwinding mechanism 7, a tension module 8, a guide wheel 9, a second cutting wheel 10, a control box 11, a wire laying mechanism 12, a cutting wire lifting system 13, a steering guide wheel 14, and a support platform 15.
[0048] The rotating mechanism 3 is mounted in the middle of the operating platform of the frame 1 via the support table 15, and is used to clamp the workpiece 4.
[0049] The frame 1 is equipped with a wire take-up and unwinding mechanism 7, a tension module 8, and a wire laying mechanism 12 on both the left and right sides of the support platform 15, with the corresponding mechanisms on both sides arranged symmetrically. Two steering guide wheels 14 are symmetrically arranged on the frame 1 and located at the front end of the left and right sides of the support platform 15 for steering the cutting wire 4. At the front center of the frame 1, the first cutting wheel 5 and the second cutting wheel 10 are symmetrically arranged on the lifting frame of the cutting wire lifting system 13. Two guide wheels 9 are symmetrically arranged on the lifting frame on the outer sides of the first cutting wheel 5 and the second cutting wheel 10, and the axes of the first cutting wheel 5, the second cutting wheel 10, and the guide wheels 9 are flush.
[0050] The cutting wire 6 on the left-side take-up and unwind mechanism 7 of the frame 1 passes sequentially around the wire laying mechanism 12, the tension module 8, and the steering guide wheel 14 before turning towards the front end of the frame. It then passes sequentially around the first guide wheel 9, the first cutting wheel 5, the second cutting wheel 10, and the second guide wheel 9 before turning towards the right side of the frame 1. It then passes sequentially around the steering guide wheel 14, the tension module 8, and the wire laying mechanism 12 before winding onto the right-side take-up and unwind mechanism 7. The cutting wire 6 between the first cutting wheel 5 and the second cutting wheel 10 is in a horizontal straight line. The two take-up and unwind mechanisms 7 alternately take up and unwind the wire, causing the cutting wire 6 to cut back and forth. The take-up and unwind mechanism 7, the tension module 8, the wire laying mechanism 12, and the cutting wire lifting system 13 are all connected to the control box 11 mounted on the frame 1. The control box 11 controls the operation of each component.
[0051] Although the principles of this utility model have been described in detail above with reference to preferred embodiments, those skilled in the art should understand that the above embodiments are merely illustrative explanations of the implementation of this utility model and are not intended to limit the scope of this utility model. The details in the embodiments do not constitute a limitation on the scope of this utility model. Any obvious changes, such as equivalent transformations or simple substitutions, based on the technical solution of this utility model without departing from its spirit and scope fall within the protection scope of this utility model.
Claims
1. A ring groove processing equipment, characterized in that, The processing equipment includes a frame (1), a wire cutting structure, a rotating mechanism (3), and a control box (11); The wire cutting structure is installed on the upper part of the frame (1). The wire cutting structure includes a first cutting wheel (5), a cutting wire (6), a take-up and undo mechanism (7), and a second cutting wheel (10). The take-up and undo mechanism (7) is provided on the left and right sides of the frame (1). The first cutting wheel (5) and the second cutting wheel (10) are horizontally spaced at the front end of the middle part of the frame (1). The cutting wire (6) on one side of the take-up and undo mechanism (7) passes around the first cutting wheel (5) and the second cutting wheel (10) and then winds around the take-up and undo mechanism (7) on the other side. The cutting wire (6) between the first cutting wheel (5) and the second cutting wheel (10) is in a horizontal straight line state. The take-up and undo mechanisms (7) on both sides are connected to the control box (11) respectively, and take up and undo the wire alternately under the control of the control box (11). The rotating mechanism (3) includes a second motor (3.1) and a chuck; the output shaft of the second motor (3.1) is horizontal, and the center of the chuck is installed at the end of the output shaft. The chuck is used to clamp the workpiece (4), and the workpiece (4) is axially perpendicular to the cutting line (6) between the first cutting wheel (5) and the second cutting wheel (10); the second motor (3.1) drives the chuck and the workpiece (4) to rotate 360°. The first cutting wheel (5) and the second cutting wheel (10) are mounted on the lifting mechanism, or the rotating mechanism (3) is mounted on the lifting mechanism; the processing equipment uses the lifting mechanism to make the cutting line (6) between the first cutting wheel (5) and the second cutting wheel (10) cut the workpiece (4).
2. The annular groove processing equipment according to claim 1, characterized in that, The rotation direction of the workpiece (4) is opposite to the movement direction of the cutting line (6).
3. The annular groove processing equipment according to claim 1, characterized in that, The lifting mechanism is a workpiece lifting mechanism (2), which includes a support frame (2.1), a first motor (2.2), a first motor mounting base (2.3), a drive wheel (2.4), a synchronous belt (2.5), a driven wheel, a lifting frame (2.9), a lead screw mounting base (2.10), a support column (2.12), and a lead screw; Below the cutting line (6), the support frame (2.1) is mounted on the frame (1); the first motor (2.2) is mounted on the rear side of the support frame (2.1) via the first motor mounting base (2.3) and is connected to the control box (11); the output shaft of the first motor (2.2) is in a vertical position, the drive wheel (2.4) is mounted on the output shaft of the first motor (2.2), and the drive wheel (2.4) is connected to the support frame (2.1) via the timing belt (2.5). The driven wheel on the lower inner side is connected; the driven wheel is installed at the end of the lead screw; the lead screw is in a longitudinal position inside the support frame (2.1), and both ends of the lead screw are connected to the support frame (2.1) through the lead screw mounting seat (2.10); the lifting frame (2.9) is threadedly connected to the lead screw through the lead screw nut; the support column (2.12) is coaxially installed on the top of the lifting frame (2.9), and the workpiece (4) is installed on the top of the support column (2.12) through the rotating mechanism (3).
4. The annular groove processing equipment according to claim 3, characterized in that, The workpiece lifting mechanism (2) also includes a guide rail (2.7) and a slider (2.8); the two guide rails (2.7) are longitudinally symmetrically installed on both sides of the front end of the support frame (2.1); the left and right sides of the lifting frame (2.9) are slidably installed on the guide rails (2.7) through the sliders (2.8).
5. The annular groove processing equipment according to claim 4, characterized in that, The workpiece lifting mechanism (2) also includes a lower limit switch (2.6) and an upper limit switch (2.11); at the upper and lower ends of the two guide rails (2.7), the upper limit switch (2.11) and the lower limit switch (2.6) are respectively installed on the support frame (2.1), and the upper limit switch (2.11) and the lower limit switch (2.6) are respectively connected to the control box (11).
6. The annular groove processing equipment according to claim 3, characterized in that, The rotating mechanism (3) further includes a second motor mounting base (3.3); the second motor (3.1) is mounted on the top of the support column (2.12) via the second motor mounting base (3.3).
7. The annular groove processing equipment according to claim 1, characterized in that, The wire cutting structure also includes a guide wheel (9); the first cutting wheel (5), the guide wheel (9) and the second cutting wheel (10) are arranged in a triangular pattern at the front end of the middle part of the frame (1); The cutting line (6) released by the take-up and release mechanism (7) on one side forms a ring cutting line around the first cutting wheel (5), the guide wheel (9) and the second cutting wheel (10), and then wraps around the second cutting wheel (10) and onto the take-up and release mechanism (7) on the other side.
8. The annular groove processing equipment according to claim 1, characterized in that, The wire cutting structure also includes guide wheels (9), a wire cutting lifting system (13), and steering guide wheels (14); two steering guide wheels (14) are symmetrically arranged on the front ends of the left and right sides of the frame (1); at the front end of the middle part of the frame (1), the first cutting wheel (5) and the second cutting wheel (10) are symmetrically arranged on the wire cutting lifting system (13), and two guide wheels (9) are symmetrically arranged on the wire cutting lifting system (13) on the outside of the first cutting wheel (5) and the second cutting wheel (10), and the axes of the first cutting wheel (5), the second cutting wheel (10) and the guide wheels (9) are flush; The cutting line (6) released from the take-up and release mechanism (7) on one side is turned by the steering guide wheel (14) and then passes around the first guide wheel (9), the first cutting wheel (5), the second cutting wheel (10) and the second guide wheel (9) in sequence. It is then turned by the steering guide wheel (14) on the other side and wrapped around the take-up and release mechanism (7) on the other side.
9. The annular groove processing equipment according to claim 1, characterized in that, The frame (1) is also provided with one or more support seats; the support seats are coaxially located below the workpiece (4).
10. The annular groove processing equipment according to claim 9, characterized in that, The support base has V-shaped blocks symmetrically arranged on both sides of its top end, and rollers are provided on the inclined surface of the V-shaped blocks; the support base supports the workpiece (4) through the V-shaped blocks.