A high-precision large-scale numerical control machine tool slide end face turning device and method

Abstract

The application discloses a high-precision large-scale numerical control machine tool slide end face turning device and method, which comprises a taper handle connected with a tool holder body, a left screw rod arranged on the tool holder body, a copper nut threadedly matched with the left screw rod, a slide fastened with the slide nut through a screw, an upper end of the slide fastened with a hanging frame through a screw, a lower end of the slide connected with the tool holder body through a 55-degree dovetail guide rail, the hanging frame and the tool holder fastened through a key and a screw, a copper pad arranged on the tool holder and in contact with a guide surface of the tool holder body to ensure linear movement of the tool holder on the tool holder body, and screws and turning tools arranged on the tool holder, the screws being used for adjusting the amount of feed of the turning tools. The application can effectively reduce labor intensity, shorten a production cycle and save cost.

Description

Technical Field

[0001] This invention belongs to the field of large CNC machine tool technology, and specifically relates to a device and method for turning the end face of a slide of a high-precision large CNC machine tool. Background Technology

[0002] To improve the performance of large, high-precision CNC machine tools, it is usually necessary to connect a functional attachment head for machining workpieces. The functional attachment head is keyed to the ram end face and the milling spindle end face of the CNC machine tool. The CNC machine tool spindle rotates, and torque is transmitted through the key on the milling spindle end face. To eliminate the overall error after connecting the functional attachment head and ensure the accuracy requirements of the machined workpiece, the ram end face of the CNC machine tool must be scraped after assembly to ensure that the perpendicularity of the ram end face to the spindle rotation center line is within 0.02mm. Traditionally, this is done manually, requiring approximately three shifts, which is labor-intensive and inconvenient for workers. Summary of the Invention

[0003] In order to overcome the above technical problems, the purpose of this invention is to provide a device and method for turning the end face of a slide on a high-precision large CNC machine tool. After being assembled on a high-precision CNC machine tool, the end face of the high-precision CNC machine slide is turned perpendicular to the spindle rotation center line, which can effectively reduce labor intensity, shorten the production cycle, and save costs.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A high-precision large CNC machine tool slide end face turning device includes a tapered shank 3 connected to a tool holder body 1. A left lead screw 10 is provided on the tool holder body 1, and the left lead screw 10 is threadedly engaged with a copper nut 21. The copper nut 21 is fastened to a slide 22 with screws. The upper end of the slide 22 is fastened to a bracket 23 with screws, and the lower end of the slide 22 is connected to the tool holder body 1 by a 55° dovetail guide rail. The bracket 23 and the tool holder 24 are positioned by a key and fastened to each other with screws. A copper pad 25 is installed on the tool holder 24 and contacts the guide surface of the holder body 1 to ensure that the tool holder 24 moves linearly on the tool holder body 1. A screw 26 and a turning tool 27 are both installed on the tool holder 24. The screw 26 is used to adjust the feed rate of the turning tool 27.

[0006] The small outer circle at the left end of the tapered shank 3 is clearance-fitted with the tool holder body 1, and the large shoulder surface on the left side is fastened to the tool holder body 1 by screws to form a whole. The worm gear 4 is connected to the tool holder body 1 by bearings, and the bearings, worm gear 4, and tool holder body 1 are all transition fits. The pinion 7 is keyed to the worm gear 4. The transmission handle 9 is threaded to the positioning plate 8. The small outer circle at the left end of the positioning plate 8 is clearance-fitted with the tool holder body 1, the large outer circle at the right end is clearance-fitted with the internal gear 6, the large shoulder surface at the left end is in surface contact with the inner shoulder surface of the internal gear 6, and the internal gear 6 and the positioning plate 8 are connected to the tool holder body 1 by screws.

[0007] The inner hole of the tool holder body 1 is clearance-fitted with the large outer circle of the gear shaft 20 and is integrated with it. The small outer circle of the upper end of the gear shaft 20 and the handle 19 are respectively fastened to the handle body 18 with round pins. The gear shaft 20 meshes with the right rack teeth of the circular rack 11. The left outer circle of the circular rack 11 is clearance-fitted with the inner hole of the worm gear shaft 12. The circular rack 11 is connected to the right end of the pull key 13 through a round pin. The left end of the pull key 13 is clearance-fitted with the keyway of the worm gear shaft 12. The spring plate 14 is fastened to the pull key 13 with screws. The large change wheel 17 is key-connected to the worm gear shaft 12. The small change wheel 16 is key-connected to the left lead screw 10. The large change wheel 17 and the small change wheel 16 mesh with each other. The handwheel 15 is key-connected to the left lead screw 10 and locked with a nut at the left end. The left lead screw 10 is integrated with the tool holder body 1.

[0008] The upper surface of the slide block 22 contacts the surface of the bracket 23 and is fastened with screws. The lower end of the slide block 22 is fastened with the copper nut 21. The tool holder 24 is keyed to the bracket 23 and fastened with screws. The tool holder 24 is clearance-fitted with the square hole of the cutting tool 27 and is pressed onto the tool holder 24 with screws. The inner hole of the tool holder 24 is clearance-fitted with the outer circle of the copper pad 25 and fastened with screws. The screw 26 is threaded to the tool holder 24 and contacts the surface of the cutting tool 27.

[0009] The left end of the circular rack 11 is provided with a groove for placing the pull key 13.

[0010] The middle part of the pull key 13 is in contact with the surface of the spring sheet 14, and the two sides of the pull key 13 have protrusions in opposite directions.

[0011] One section of the spring sheet 14 has a horizontal structure, one end of which is a downward arc-shaped structure, and the other end of which is an upward arc-shaped structure. The radius of the downward arc-shaped structure is larger than that of the upward arc-shaped structure.

[0012] A method for using a high-precision large CNC machine tool slide face turning device includes the following steps: A pull pin 2 is mounted on a taper shank 3, which is then installed into the taper hole of the machine tool spindle and fastened to the end face of the machine tool spindle with bolts. The pull pin 2 is locked by the puller mechanism of the machine tool spindle, thus connecting the turning device to the machine tool spindle as a whole. The device is installed on the machine tool spindle, a machine tool simulation worktable, and a simulation stop block. The end face of the machine tool spindle serves as the reference surface, and the taper hole of the machine tool spindle serves as the reference hole, using taper surface centering and end face positioning. The pull pin 2 and taper shank 3 of the turning device are installed into the taper hole of the machine tool spindle and fastened to the end face of the machine tool spindle with bolts. The machine tool spindle rotates, and power is transmitted through the taper shank 3 of the turning device and the positioning key on the end face of the machine tool spindle, causing the entire turning device to rotate together with the machine tool spindle. A stop is connected to the machine tool worktable to block the transmission handle 9 from rotating. According to the transmission principle, since the transmission handle 9 is stationary, the internal gear 6 is also stationary. The pinion 7 rotates together with the tool holder body 1, making relative motion with the internal gear 6. The internal gear 6 and the pinion 7 form a planetary mechanism. The pinion 7 drives the worm gear 4, the worm gear 4 drives the worm wheel 5, the worm wheel 5 drives the worm wheel shaft 12 through the pull key 13, the worm wheel shaft 12 drives the large change gear 17, the large change gear 17 drives the small change gear 16, and the small change gear 16 drives the left lead screw 10. The left lead screw 10 drives the copper nut 21, which is fastened to the slide 22. The left lead screw 10 rotates automatically, and the copper nut 21 moves linearly on the left lead screw 10, thereby driving the bracket 23, tool holder 24, copper pad 25, and turning tool 27. The copper pad 25 is in contact with the guide surface of the tool holder body 1, ensuring that the tool holder 24 moves linearly on the tool holder body 1. Loosen the screw 26, adjust the feed rate of the turning tool 27, and the turning tool 27 automatically feeds to turn the end face of the slide, realizing the automatic function of the self-turning device.

[0013] Manually turning the handle 19 drives the gear shaft 20, which meshes with the circular rack 11 to make linear motion, compressing the spring plate 14 and disengaging the pull key 13 from the worm gear shaft 12. Rotating the handwheel 15 drives the left lead screw 10, which in turn drives the copper nut 21, slide 22, bracket 23, tool holder 24, copper pad 25, and cutting tool 27 to make linear motion on the tool holder body 1, realizing the manual function and achieving rapid tool retraction.

[0014] The beneficial effects of the present invention.

[0015] This invention aims to improve the perpendicularity of the ram end face to the spindle rotation center line after the assembly of a high-precision CNC machine tool. A turning device is installed inside the spindle taper hole of the CNC machine tool and connected to the machine tool using hexagonal bolts and a spindle end face key. As the CNC machine tool spindle rotates, torque is transmitted through the taper shank and spindle end face key, and the turning tool automatically feeds, achieving the turning function. Because the design and process benchmarks are unified, the overall assembly error of the CNC machine tool is effectively eliminated, improving the overall accuracy of the CNC machine tool. This invention uses a tool holder and tool post connection; by changing the tool holder and turning tool, it can meet the requirements for turning the ram end face of high-precision CNC machine tools with different cross-sectional dimensions, materials, and models of spindle taper holes, making it widely applicable. This invention also includes a manual and automatic tool feed conversion device. This invention is rationally designed, simple in structure, and easy to use. It can effectively improve accuracy requirements, reduce worker labor intensity, shorten the production cycle of large high-precision CNC machine tools, reduce costs, and is safe, simple, convenient, and quick to operate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a cross-sectional view of the tapered shank transmission component of the present invention.

[0018] Figure 3 This is a cross-sectional view of the screw drive component of the present invention.

[0019] Figure 4 This is a cross-sectional view of the tool holder transmission component of the present invention.

[0020] Figure 5 This is a structural diagram of the tool holder body of the present invention.

[0021] Figure 6 This is a structural diagram of the tapered handle of the present invention.

[0022] Figure 7 This is a schematic diagram of the positioning plate.

[0023] Figure 8 This is a schematic diagram of an internal gear.

[0024] Figure 9 This is a schematic diagram of the left lead screw.

[0025] Figure 10 This is a schematic diagram of a circular rack.

[0026] Figure 11 This is a schematic diagram of the turbine shaft.

[0027] Figure 12 This is a diagram of the pull button.

[0028] Figure 13 This is a structural diagram of the spring sheet of the present invention.

[0029] Figure 14 This is a schematic diagram of the slide.

[0030] Figure 15 This is a schematic diagram of the mounting bracket.

[0031] Figure 16 This is a structural diagram of the tool holder of the present invention.

[0032] Figure 17 This is a schematic diagram of a lathe tool.

[0033] In the diagram: 1 is the tool holder body, 2 is the pull stud, 3 is the taper shank, 4 is the worm gear, 5 is the worm wheel, 6 is the internal gear, 7 is the pinion, 8 is the positioning plate, 9 is the transmission handle, 10 is the left lead screw, 11 is the circular rack, 12 is the worm wheel shaft, 15 is the pull key, 14 is the spring plate, 15 is the handwheel, 16 is the small change wheel, 17 is the large change wheel, 18 is the handle body, 19 is the handle, 20 is the gear shaft, 21 is the copper nut, 22 is the slide, 23 is the bracket, 24 is the tool holder, 25 is the copper washer, 26 is the screw, and 27 is the lathe tool. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figures 1-17 As shown: A device and method for turning the end face of a slide on a high-precision large CNC machine tool, comprising a tapered shank 3 connected to a tool holder body 1, a left lead screw 10 mounted on the tool holder body 1, the left lead screw 10 being threadedly engaged with a copper nut 21, the copper nut 21 being fastened to a slide 22 with screws, the upper end of the slide 22 being fastened to a bracket 23 with screws, the lower end of the slide 22 being connected to the tool holder body 1 by a 55° dovetail guide rail, the bracket 23 being positioned by a key and fastened to the tool holder 24 with screws, a copper pad 25 mounted on the tool holder 24, the copper pad 25 contacting the guide surface of the bracket body 1 to ensure that the tool holder 24 moves linearly on the tool holder body 1, and a screw 26 and a turning tool 27 both mounted on the tool holder 24, the screw 26 being used to adjust the feed rate of the turning tool 27.

[0036] The small outer circle at the left end of the tapered shank 3 is clearance-fitted with the tool holder body 1, and the large shoulder surface on the left side is fastened to the tool holder body 1 by screws to form a whole. The worm gear 4 is connected to the tool holder body 1 by bearings, and the bearings, worm gear 4, and tool holder body 1 are all transition fits. The pinion 7 is keyed to the worm gear 4. The transmission handle 9 is threaded to the positioning plate 8. The small outer circle at the left end of the positioning plate 8 is clearance-fitted with the tool holder body 1, the large outer circle at the right end is clearance-fitted with the internal gear 6, the large shoulder surface at the left end is in surface contact with the inner shoulder surface of the internal gear 6, and the internal gear 6 and the positioning plate 8 are connected to the tool holder body 1 by screws.

[0037] The inner hole of the tool holder body 1 is clearance-fitted with the large outer circle of the gear shaft 20 and connected as a whole. The small outer circle of the upper end of the gear shaft 20 and the handle 19 are fastened to the handle body 18 with a round pin. The gear shaft 20 meshes with the right rack tooth of the circular rack 11. The left outer circle of the circular rack 11 is clearance-fitted with the inner hole of the worm gear shaft 12. The circular rack 11 is connected to the right end of the pull key 13 through a round pin hinge. The left end of the pull key 13 is clearance-fitted with the keyway of the worm gear shaft 12. The spring 14 is fastened to the pull key 13 with a screw. The large gear 17 is key-connected to the worm gear shaft 12. The small gear 16 is key-connected to the left lead screw 10. The large gear 17 and the small gear 16 mesh with each other. The handwheel 15 is key-connected to the left lead screw 10 and locked at the left end with a nut. The left lead screw 10 is connected to the tool holder body 1 as a whole.

[0038] The upper end face of the slide block 22 is fastened to the bracket 23 with screws, and the lower end of the slide block 22 is fastened to the copper nut 21 with screws. The tool holder 24 is fastened to the bracket 23 with key positioning screws. The tool holder 24 is clearance-fitted with the square hole of the cutting tool 27 and pressed onto the tool holder 24 with screws. The inner hole of the tool holder 24 is clearance-fitted with the outer circle of the copper pad 25 and fastened with screws. The screw 26 is threadedly connected to the tool holder 24 and contacts the surface of the cutting tool 27.

[0039] like Figure 5 As shown: The bottom of the tool holder body 1 is equipped with a left lead screw 10, and the surface of the tool holder body 1 is provided with two holes for mounting a turbine shaft 12. A turbine 5 is provided on the turbine shaft 12, and the end of the tool holder body 1 is provided with a hole for mounting a worm gear 4. A positioning plate 8 is provided below the hole.

[0040] like Figure 6 As shown, the tapered shank 3 has a protrusion at its end for mounting on the tool holder body 1 with clearance fit. The tapered shank 3 has a groove hole for connecting to the machine tool spindle via screws.

[0041] like Figure 7 , Figure 8 As shown, the outer circumference of the positioning disk 8 is stepped, which is used to make contact with the shoulder surface of the internal gear 6 to prevent the internal gear 8 from moving axially.

[0042] like Figure 9As shown, the left lead screw 10 has fine thread, T-type thread, and fine thread from left to right.

[0043] like Figure 10 As shown, the left end of the circular rack 11 has a groove for placing the pull key 13.

[0044] like Figure 12 As shown: the middle part of the pull key 13 is in contact with the surface of the spring sheet 14, and the two sides of the pull key 13 have protrusions in opposite directions.

[0045] like Figure 13 As shown: One section of the spring sheet 14 is a horizontal structure, one end of the horizontal structure is a downward arc-shaped structure, and the end of the arc-shaped structure is an upward arc-shaped structure. The radius of the downward arc-shaped structure is larger than that of the upward arc-shaped structure.

[0046] Working principle of the invention:

[0047] The pull pin 2 is mounted on the taper shank 3, which is then installed into the taper hole of the machine tool spindle and fastened to the end face of the machine tool spindle with bolts. The pull pin 2 is locked by the puller mechanism of the machine tool spindle, thus connecting the self-turning device to the machine tool spindle as one unit. The device is installed on the machine tool spindle, along with a machine tool simulation worktable and a simulation stop. The end face of the machine tool spindle serves as the reference surface, and the taper hole of the machine tool spindle serves as the reference hole. Conical surface centering and end face positioning are used. The self-turning device pull pin 2 and taper shank 3 are installed into the taper hole of the machine tool spindle and fastened to the end face of the machine tool spindle with bolts. When the machine tool spindle rotates, torque is transmitted through the taper shank 3 of the self-turning device and the positioning key on the end face of the machine tool spindle, causing the entire self-turning device to rotate together with the machine tool spindle. A stop is connected to the machine tool worktable to block the transmission handle 9 from rotating. According to the transmission principle, since the transmission handle 9 is stationary, the internal gear 6 is also stationary. The pinion 7 rotates together with the tool holder body 1, making relative motion with the internal gear 6. The internal gear 6 and the pinion 7 form a planetary mechanism. The pinion 7 drives the worm gear 4, the worm gear 4 drives the worm wheel 5, the worm wheel 5 drives the worm wheel shaft 12 through the pull key 13, the worm wheel shaft 12 drives the large change gear 17, the large change gear 17 drives the small change gear 16, and the small change gear 16 drives the left lead screw 10. The left lead screw 10 drives the copper nut 21, which is fastened to the slide block 22. The left lead screw 10 rotates automatically, and the copper nut 21 moves linearly on the left lead screw 10, thereby driving the bracket 23, tool holder 24, copper pad 25, and turning tool 27. The copper pad 25 is in contact with the guide surface of the tool holder body 1, ensuring that the tool holder 24 moves linearly on the tool holder body 1. Loosen the screw 26 and adjust the feed rate of the turning tool 27. The turning tool 27 automatically feeds to turn the end face of the slide block, realizing the automatic function of the self-turning device.

[0048] Manually turning the handle 19 drives the gear shaft 20, which meshes with the circular rack 11 to make linear motion, compressing the spring plate 14 and disengaging the pull key 13 from the worm gear shaft 12. Rotating the handwheel 15 drives the left lead screw 10, which in turn drives the copper nut 21, slide 22, bracket 23, tool holder 24, copper pad 25, and cutting tool 27 to make linear motion on the tool holder body 1, realizing the manual function and achieving rapid tool retraction.

Claims

1. A device for turning the end face of a slide ram on a high-precision large CNC machine tool, characterized in that, Includes a taper shank (3), which is connected to the tool holder body (1). A left lead screw (10) is provided on the tool holder body (1). The left lead screw (10) is threadedly engaged with a copper nut (21). The copper nut (21) is fastened to the slide (22) with screws. The upper end of the slide (22) is fastened to the bracket (23) with screws. The lower end of the slide (22) is connected to the tool holder body (1) by a 55° dovetail guide rail. The bracket (23) and the tool holder (24) are positioned by a key and fastened to each other with screws. A copper pad (25) is installed on the tool holder (24). The copper pad (25) contacts the guide surface of the tool holder body (1) to ensure that the tool holder (24) moves linearly on the tool holder body (1). A screw (26) and a lathe tool (27) are both installed on the tool holder (24). The screw (26) is used to adjust the feed rate of the lathe tool (27). The inner hole of the tool holder body (1) is clearance-fitted with the large outer circle of the gear shaft (20) and connected as a whole. The small outer circle of the upper end of the gear shaft (20) and the handle (19) are respectively fastened to the handle body (18) with round pins. The gear shaft (20) meshes with the right rack tooth profile of the circular rack (11). The left outer circle of the circular rack (11) is clearance-fitted with the inner hole of the worm gear shaft (12). The circular rack (11) is connected to the right end of the pull key (13) through a round pin hinge. The left end of the key (13) is fitted with the keyway of the worm gear shaft (12) with clearance. The spring plate (14) is fastened to the key (13) with screws. The large change wheel (17) is keyed to the worm gear shaft (12). The small change wheel (16) is keyed to the left lead screw (10). The large change wheel (17) and the small change wheel (16) are toothed. The handwheel (15) is keyed to the left lead screw (10). The left end is locked with a nut. The left lead screw (10) is integrated with the tool holder body (1). The left end of the circular rack (11) is provided with a groove for placing the pull key (13); The middle part of the pull key (13) is in contact with the surface of the spring sheet (14), and the two sides of the pull key (13) are protruding structures in opposite directions; One section of the spring sheet (14) is a horizontal structure, one end of the horizontal structure is a downward arc-shaped structure, and the end of the arc-shaped structure is an upward arc-shaped structure. The radius of the downward arc-shaped structure is larger than that of the upward arc-shaped structure.

2. The device for turning the end face of a slide ram on a high-precision large CNC machine tool according to claim 1, characterized in that, The small outer circle at the left end of the tapered shank (3) is clearance-fitted with the tool holder body (1), and the large shoulder surface on the left side is fastened to the tool holder body (1) by screws to form a whole. The worm (4) is connected to the tool holder body (1) by bearings. The bearings, worm (4), and tool holder body (1) are all transition fits. The pinion (7) is keyed to the worm (4). The transmission handle (9) is threaded to the internal gear (6). The small outer circle at the left end of the positioning plate (8) is clearance-fitted with the tool holder body (1), the large outer circle at the right end is clearance-fitted with the internal gear (6), the large shoulder surface at the left end is in contact with the inner shoulder surface of the internal gear (6), and the internal gear (6) and the positioning plate (8) are fastened to the tool holder body (1) to form a whole by screws.

3. The device for turning the end face of a slide ram on a high-precision large CNC machine tool according to claim 1, characterized in that, The upper end of the slide (22) is fastened to the bracket (23) with screws, the lower end of the slide (22) is fastened to the copper nut (21) with screws, the tool holder (24) is fastened to the bracket (23) with key positioning screws, the tool holder (24) is clearance-fitted to the square hole of the cutting tool (27) and pressed onto the tool holder (24) with screws, the inner hole of the tool holder (24) is clearance-fitted to the outer circle of the copper pad (25) and fastened with screws, the screw (26) is threaded to the tool holder (24) and contacts the surface of the cutting tool (27).

4. A method of using a high-precision large-scale CNC machine tool slide end face turning device according to any one of claims 1-3, characterized in that, The steps include:

1. Installing the pull stud (2) onto the taper shank (3), then installing the taper shank (3) into the taper hole of the machine tool spindle, and fastening it to the end face of the machine tool spindle with bolts.

2. Locking the pull stud (2) through the puller mechanism of the machine tool spindle connects the self-turning device to the machine tool spindle as one unit.

3. Installing the self-turning device on the machine tool spindle, the machine tool simulation worktable and a simulation stop block, with the end face of the machine tool spindle as the reference surface and the taper hole of the machine tool spindle as the reference hole, using taper surface centering and end face positioning; 4. Connecting the self-turning device pull stud (2) and taper shank (3) to the machine tool spindle. 3) Installed in the taper hole of the machine tool spindle and fastened to the end face of the machine tool spindle with bolts. When the machine tool spindle rotates, power is transmitted through the taper shank (3) of the self-turning device and the positioning key on the end face of the machine tool spindle. The entire self-turning device rotates together with the machine tool spindle. A stop block is connected to the machine tool worktable to block the transmission handle (9) so that it does not rotate. According to the transmission principle, when the transmission handle (9) does not move, the internal gear (6) also does not move. The pinion (7) rotates together with the tool holder body (1) and interacts with the internal gear (6). For motion, the internal gear (6) and the pinion (7) are a planetary mechanism. The pinion (7) drives the worm (4), the worm (4) drives the worm wheel (5), the worm wheel (5) drives the worm wheel shaft (12) through the pull key (13), the worm wheel shaft (12) drives the large gear (17), the large gear (17) drives the small gear (16), the small gear (16) drives the left lead screw (10), the left lead screw (10) drives the copper nut (21), the copper nut (21) is fastened to the slide (22), and the left... The lead screw (10) rotates automatically, and the copper nut (21) moves linearly on the left lead screw (10), thereby driving the bracket (23), tool holder (24), copper pad (25), and turning tool (27). The copper pad (25) is in contact with the guide surface of the tool holder body 1, ensuring that the tool holder (24) moves linearly on the tool holder body (1). Loosen the screw (26), adjust the feed amount of the turning tool (27), and the turning tool (27) automatically feeds to perform turning on the end face of the slide block, realizing the automatic function of the self-turning device; Manually turn the handle (19) to drive the gear shaft (20). The gear shaft (20) meshes with the circular rack (11) to make linear motion, compressing the spring plate (14) and disengaging the pull key (13) from the worm gear shaft (12). Rotate the handwheel (15) to drive the left lead screw (10). The left lead screw (10) drives the copper nut (21), slide (22), bracket (23), tool holder (24), copper pad (25) and cutting tool (27) to make linear motion together on the tool holder body (1), realizing the manual function and playing the role of rapid tool retraction.

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