Double-station numerical control turning machine tool for blade deep processing

Abstract

The invention discloses a double-station numerical control turning machine tool for blade deep processing, and relates to the technical field of numerical control turning machine tools, the double-station numerical control turning machine tool comprises a double-station numerical control machine tool body, a conical cover, a bottom plate, a fixing frame, a numerical control blade and a central column, and further comprises a positioning mechanism arranged on the outer side of the lower end of the central column; the oil pipe is arranged above the center column and located on one side of the conical cover, the oil pipe is of an L-shaped structure, a friction plate attached to the center hole of the numerical control blade is arranged at the upper end of the center hole of the numerical control blade, and an inclined face is arranged at the upper end of the friction plate; the coaxial reversing mechanism is arranged between the center column and the oil pipe and used for enabling the friction plate to generate friction resistance opposite to the surrounding direction on the inner wall of the center hole of the numerical control blade in the surrounding turning process. The oil pipe, the friction plate and the coaxial reversing mechanism are arranged, friction resistance opposite to the turning surrounding track of the tool bit is generated through rotation of the friction plate in the center hole of the numerical control blade, and the positioning stability of the numerical control blade during turning is improved.

Description

Technical Field

[0001] This invention relates to the field of CNC turning machine tool technology, specifically a dual-station CNC turning machine tool for deep machining of cutting tools. Background Technology

[0002] CNC inserts are indexable cutting tools used on CNC machine tools and are the mainstream tools in modern metal cutting. Deep machining of CNC inserts typically involves a series of precision machining and surface treatments on a semi-finished insert to achieve high precision, high performance, and high reliability—a complete manufacturing process. This usually includes precision grinding, grooving, edge sharpening and dulling, and surface treatment and coating. During grooving, a CNC turning machine is used to machine chip breaker grooves on the upper and lower surfaces of the insert. These grooves control the shape and flow of chips during machining. Through specific geometry, the chip breaker grooves cause additional deformation during chip flow, causing the chips to curl and break, forming short, uniform chips and preventing long chips from entangled in the tool or workpiece.

[0003] To improve machining efficiency during the processing stage, dual-station CNC turning machines are used. These machines are equipped with two independent or linked stations (spindles), which can process two workpieces simultaneously or alternately, greatly improving processing efficiency. Usually, before machining CNC inserts, the inserts need to be fixed on the machining table. Due to the variety of CNC insert shapes and specifications, a center hole of a specific size is opened on the inside. This center hole is for mounting when using different types of CNC inserts. Different shapes make it impossible for conventional fixtures to clamp and fix them properly. Therefore, the center hole is also used for positioning when machining CNC inserts. The commonly used positioning mechanism is to use a synchronous expansion or contraction method to position the insert.

[0004] In the prior art, during the process of turning chip breaker grooves on the upper and lower surfaces of a CNC insert, the cutting head of the turning machine tool will move in a circular motion. For example, if the cross-section of the insert is triangular, then the movement trajectory of the cutting head is triangular. Since the CNC insert is also a cutting tool, it has high hardness, and a cutting head with a hardness exceeding that of the CNC insert is required for turning. When using a positioning mechanism with synchronous expansion, the cutting head experiences greater resistance on its circular movement trajectory. Using a conventional positioning mechanism can easily cause the CNC insert to rotate and deviate during turning, resulting in deviations in the turning of the chip breaker groove.

[0005] To address the aforementioned issues, there is an urgent need for innovative design based on the existing dual-station CNC turning machine tool. Summary of the Invention

[0006] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide a dual-station CNC turning machine tool for deep machining of cutting tools, thereby solving the problem mentioned in the background art where the turning head experiences significant resistance on its circular movement trajectory, and conventional positioning mechanisms easily lead to rotational deviation of the CNC cutting tool during turning.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a dual-station CNC turning machine tool for deep machining of cutting tools, comprising a dual-station CNC machine tool body, a conical cover, a base plate, a fixing frame, CNC cutting tools, a center column, and further comprising: A positioning mechanism located on the outer side of the lower end of the central column is used to initially fix the CNC cutting tool placed on the top of the fixing frame; An oil pipe is set above the central column and located on one side of the conical cover, and the oil pipe is set in an L-shaped structure. A friction plate is provided at the upper end of the central hole of the CNC cutting tool, and the upper end of the friction plate is provided with an inclined surface. A coaxial reversing mechanism is set between the central column and the oil pipe to make the friction plate generate frictional resistance on the inner wall of the CNC cutting tool center hole in the opposite direction to the turning direction during the turning process; An adaptive resistance adjustment mechanism is installed between the oil pipe and the coaxial reversing mechanism to adaptively adjust the friction resistance of the friction plate according to the distance between the turning position and the center of the CNC cutting tool's central hole during the circular turning process.

[0008] Preferably, the top of the fixing frame is provided with a through hole corresponding to the center hole of the CNC cutting tool; The positioning mechanism includes a movable block that slides with the central column. The movable block has a positioning bolt that is threadedly engaged with it in the interior. The outer wall of the central column has positioning holes that fit with the ends of the positioning bolts at equal intervals. The outer wall of the central column is fixed at equal angles above the movable block with a first elastic telescopic rod. The telescopic ends of the first elastic telescopic rod are all fixed with positioning plates.

[0009] Preferably, the upper outer wall of the movable block is set as a conical surface, the upper end of the positioning plate is an arc-shaped structure, and the lower end of the positioning plate is in contact with the upper outer wall of the movable block.

[0010] Preferably, the coaxial reversing mechanism includes a first fixed seat fixedly disposed on the top of the central column, a second fixed seat disposed on the upper side of the first fixed seat, and a third fixed seat disposed above the second fixed seat corresponding to the first fixed seat; The first fixing seat, the second fixing seat, and the third fixing seat are connected and fixed in sequence by a connecting rod, and the three fixing seats form a U-shaped structure.

[0011] Preferably, the coaxial reversing mechanism further includes a central shaft rotatably connected to the center of the top of the central column. A first bevel gear is fixed to the lower outer wall of the central shaft. An inner hole is provided at the center of both the first and third fixed seats. A spiral spring is connected between the lower outer wall of the first bevel gear and the inner hole wall of the first fixed seat. A second bevel gear meshing with the first bevel gear is rotatably connected inside the second fixed seat. A third bevel gear meshing with the second bevel gear is provided inside the inner hole of the third fixed seat. A connecting plate is fixed to the top of the third bevel gear.

[0012] Preferably, the top of the central shaft passes through the connecting disc, and the central shaft is fixed to the bottom of the oil pipe.

[0013] Preferably, the adaptive resistance adjustment mechanism includes a sealing cover fixed to the top of the connecting plate, the top of the sealing cover being connected to the oil pipe via a sealing bearing, a first piston being provided inside the upper end of the oil pipe in sliding cooperation with it, a push rod being connected to the outer wall of the first piston penetrating the upper end port of the oil pipe, and an oil hole being provided at the bottom of the oil pipe.

[0014] Preferably, the adaptive resistance adjustment mechanism further includes a fixed cylinder fixed to the side wall of the sealing cover. A limit ring is fixed inside the fixed cylinder, and a second piston that slides with the fixed cylinder is provided on one side of the limit ring. A return spring is connected to the outer wall of one side of the second piston, and a third piston that slides with the fixed cylinder is fixed to the end of the return spring.

[0015] Preferably, a first connecting pipe is fixedly provided on one side of the third piston, penetrating the bottom of the connecting disc, and a second connecting pipe is connected between the top of the fixed cylinder near the limiting ring and the sealing cover.

[0016] Preferably, a second elastic telescopic rod is fixed to the outer wall of the other side of the second piston, penetrating the end of the fixed cylinder. The telescopic end of the second elastic telescopic rod is fixed with a mounting plate, and the mounting plate is fixed to the friction plate by bolts.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention is provided with an oil pipe, a friction plate and a coaxial reversing mechanism. When the cutting head is turned, the conical cover first pushes the oil pipe to rotate clockwise. The oil pipe rotates in a sealed manner through a sealing bearing at the top of the sealing cover. The oil pipe drives the central shaft to rotate. The central shaft drives the first conical gear on the outer wall to rotate clockwise inside the first fixed seat. The first conical gear drives the spiral spring to rotate and deform. Since the first conical gear, the second conical gear and the third conical gear mesh in sequence, the third conical gear rotates counterclockwise outside the central shaft. This causes the connecting plate and the oil pipe to form a coaxial reversing motion trajectory. The connecting plate drives the sealing cover to rotate counterclockwise. The sealing cover drives the friction plate to rotate counterclockwise inside the central hole of the CNC cutting tool. Thus, the friction resistance opposite to the cutting head's turning trajectory is generated by the friction plate rotating inside the central hole of the CNC cutting tool. This improves the positioning stability of the CNC cutting tool during turning and reduces the possibility of rotational deviation of the CNC cutting tool. (2) The present invention is provided with an adaptive resistance adjustment mechanism. Since the CNC insert is not a regular circle, the tool head will move closer to the center hole of the CNC insert when it moves. At this time, the lever arm of the tool head pushing the CNC insert to rotate and deviate on the turning trajectory is shortened. Therefore, the force pushing the CNC insert on the turning trajectory when the tool head moves is also reduced. Then, the push rod starts to move in the opposite direction under the action of the return spring. The push rod always fits the conical surface of the conical cover. At the same time, the degree of compression of the return spring will also be restored, so that the elastic force of the return spring when it is compressed is less adaptable to the counter-thrust force of the second piston. Therefore, the friction resistance when the friction plate fits the inner wall of the center hole of the CNC insert is also reduced, thereby avoiding the friction resistance generated by the friction plate when rotating in the opposite direction being too large and causing the CNC insert to rotate and deviate in the opposite direction. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional view of a portion of the CNC cutting tool positioning and machining structure of the present invention; Figure 3 This is a three-dimensional cross-sectional view of a portion of the CNC cutting tool positioning and machining structure of the present invention; Figure 4 This is a sectional perspective view of the coaxial reversing mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point A in the image; Figure 6 This is a cross-sectional plan view of the first fixed base, the central shaft, and the first bevel gear of the present invention; Figure 7 This is a cross-sectional plan view of the coaxial reversing mechanism of the present invention; Figure 8 This is a first-view sectional perspective view of the adaptive resistance adjustment mechanism of the present invention; Figure 9 This is a second-view sectional perspective view of the adaptive resistance adjustment mechanism of the present invention; Figure 10 For the present invention Figure 7 Enlarged view of point B in the image.

[0019] In the diagram: 1. Dual-station CNC machine tool body; 11. Conical cover; 2. Base plate; 21. Fixing frame; 22. CNC cutting tool; 23. Center column; 24. Moving block; 25. Positioning bolt; 26. Positioning hole; 27. First elastic telescopic rod; 28. Positioning plate; 3. First fixed seat; 31. Second fixed seat; 32. Third fixed seat; 33. Center shaft; 34. First bevel gear; 35. Spiral spring; 36. Second bevel gear; 37. Third bevel gear; 38. Connecting plate; 39. Sealing cover; 4. Oil pipe; 41. First piston; 42. Push rod; 43. Oil hole; 5. Fixed cylinder; 51. Limiting ring; 52. Second piston; 53. Return spring; 54. Third piston; 55. First connecting pipe; 56. Second connecting pipe; 57. Second elastic telescopic rod; 58. Mounting plate; 59. Friction plate. Detailed Implementation

[0020] 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.

[0021] Please see Figures 1 to 10 This invention provides a technical solution: a dual-station CNC turning machine tool for deep machining of cutting tools, comprising a dual-station CNC machine tool body 1, a conical cover 11, a base plate 2, a fixing frame 21, CNC cutting tools 22, a center column 23, and further comprising: A positioning mechanism is provided on the outer side of the lower end of the central column 23 to initially fix the CNC cutting tool 22 placed on the top of the fixing frame 21; An oil pipe 4 is set above the central column 23 and located on one side of the conical cover 11. The oil pipe 4 is set in an L-shaped structure. A friction plate 59 is provided at the upper end of the central hole of the CNC cutting tool 22 and fits therewith. The upper end of the friction plate 59 is provided with an inclined surface. A coaxial reversing mechanism is set between the central column 23 and the oil pipe 4 to make the friction plate 59 generate frictional resistance on the inner wall of the central hole of the CNC cutting tool 22 in the opposite direction to the turning direction during the turning process. An adaptive resistance adjustment mechanism is set between the oil pipe 4 and the coaxial reversing mechanism to adaptively adjust the resistance of the friction plate 59 according to the distance between the turning position and the center of the center hole of the CNC cutting tool 22 during the surrounding turning process.

[0022] In specific implementation, the dual-station CNC machine tool body 1 is a conventional existing technology. During turning, this type of equipment controls the movement trajectory of the cutting head through program settings. For example, if the CNC insert 22 is a triangle as shown in the figure, then the chip breaking grooves cut by the cutting head on the upper and lower surfaces of the CNC insert 22 will be triangular. The conical cover 11 is fixed on the housing of the non-rotating part above the cutting head of the dual-station CNC machine tool body 1. Because there will be a small depth change when the chip breaking groove is cut, the conical surface of the conical cover 11 can always fit the oil pipe 4 and the push rod 42 when it moves with the cutting head. The positioning mechanism is also an existing technology, which uses synchronous expansion or contraction to achieve the initial fixation of the CNC insert 22.

[0023] The top of the mounting bracket 21 is provided with a through hole corresponding to the center hole of the CNC cutting tool 22; In practice, the diameter of the through hole needs to exceed the center diameter of the CNC insert 22.

[0024] The positioning mechanism includes a movable block 24 that slides with the central column 23. The movable block 24 has a positioning bolt 25 that is threadedly engaged with it in the interior. The outer wall of the central column 23 has positioning holes 26 that fit with the ends of the positioning bolts 25 at equal intervals. The outer wall of the central column 23 is fixed with a first elastic telescopic rod 27 at equal angles above the movable block 24. The telescopic ends of the first elastic telescopic rod 27 are all fixed with positioning plates 28.

[0025] The upper outer wall of the movable block 24 is set as a conical surface, and the upper end of the positioning plate 28 is an arc-shaped structure, and the lower end of the positioning plate 28 is in contact with the upper outer wall of the movable block 24.

[0026] In practice, since the center hole diameter of the CNC cutting tool 22 is roughly the same, mainly so that different CNC cutting tools 22 can be adapted to be installed on the machine tool for use, the positioning holes 26 are opened at equal intervals.

[0027] The coaxial reversing mechanism includes a first fixed seat 3 fixedly mounted on the top of the central column 23, a second fixed seat 31 mounted on the upper side of the first fixed seat 3, and a third fixed seat 32 corresponding to the first fixed seat 3 mounted above the second fixed seat 31. The first fixing seat 3, the second fixing seat 31, and the third fixing seat 32 are connected and fixed in sequence by a connecting rod, and the three fixing seats 3, 31, and 32 form a U-shaped structure.

[0028] In practice, the first fixed seat 3, the second fixed seat 31, and the third fixed seat 32 form a fixed U-shaped structural frame under the action of the connecting rod.

[0029] The coaxial reversing mechanism also includes a central shaft 33 rotatably connected to the center of the top of the central column 23. A first bevel gear 34 is fixed to the lower outer wall of the central shaft 33. An inner hole is provided at the center of both the first fixed seat 3 and the third fixed seat 32. A spiral spring 35 is connected between the lower outer wall of the first bevel gear 34 and the inner hole wall of the first fixed seat 3. A second bevel gear 36 that meshes with the first bevel gear 34 is rotatably connected inside the second fixed seat 31. A third bevel gear 37 that meshes with the second bevel gear 36 is provided inside the inner hole of the third fixed seat 32. A connecting plate 38 is fixed to the top of the third bevel gear 37.

[0030] In practice, the spring force of the spiral spring 35 is relatively small, mainly to facilitate the rotation and reset of both the oil pipe 4 and the friction plate 59.

[0031] The top of the central shaft 33 passes through the connecting plate 38, and the central shaft 33 is fixed to the bottom of the oil pipe 4.

[0032] The adaptive resistance adjustment mechanism includes a sealing cover 39 fixed on the top of the connecting plate 38. The top of the sealing cover 39 is connected to the oil pipe 4 through a sealing bearing. The upper end of the oil pipe 4 is provided with a first piston 41 that slides with it. The outer wall of the first piston 41 is connected with a push rod 42 that passes through the upper end port of the oil pipe 4. An oil hole 43 is opened at the bottom of the oil pipe 4.

[0033] In practice, the inside of the oil pipe 4 is filled with oil on one side of the first piston 41 and inside the sealing cover 39.

[0034] The adaptive resistance adjustment mechanism also includes a fixed cylinder 5 fixed to the side wall of the sealing cover 39. A limit ring 51 is fixed inside the fixed cylinder 5, and a second piston 52 that slides with the fixed cylinder 5 is provided on one side of the limit ring 51. A return spring 53 is connected to the outer wall of one side of the second piston 52, and a third piston 54 that slides with the fixed cylinder 5 is fixed to the end of the return spring 53.

[0035] In practice, the inside of the fixed cylinder 5, located between the second piston 52 and the third piston 54, is filled with oil.

[0036] A first connecting pipe 55 is fixedly provided on one side of the third piston 54, penetrating the bottom of the connecting plate 38, and a second connecting pipe 56 is connected between the top of the fixed cylinder 5 near the limiting ring 51 and the sealing cover 39.

[0037] In practice, the first connecting pipe 55 is filled with oil.

[0038] A second elastic telescopic rod 57 is fixed to the outer wall of the other side of the second piston 52, penetrating the end of the fixed cylinder 5. The telescopic end of the second elastic telescopic rod 57 is fixed with a mounting plate 58, and the mounting plate 58 is fixed to the friction plate 59 by bolts.

[0039] In practice, the elastic force of the second elastic telescopic rod 57 is relatively small, mainly so that when the CNC cutting tool 22 is initially fixed, the friction plate 59 can fit against the inner wall of the center hole of the CNC cutting tool 22.

[0040] Working principle: First, the CNC cutting tool 22 is passed through the push rod 42 and the oil pipe 4 through the center hole and placed on the fixed frame 21. At the same time, the bottom of the CNC cutting tool 22 will press the inclined surface of the friction plate 59. The friction plate 59 will move inward and drive the mounting plate 58 to press the second elastic telescopic rod 57, so that the surface of the friction plate 59 is in contact with the inner wall of the center hole of the CNC cutting tool 22, and the second elastic telescopic rod 57 is compressed to the maximum contraction stroke. At this time, the positioning bolt 25 is rotated so that its end moves out of the positioning hole 26 and pushes the moving block 24 upward. Since the upper conical surface of the moving block 24 is in contact with the lower end of the positioning plate 28, the positioning plate 28 at the same angle expands outward synchronously. The positioning plate 28 pulls the first elastic telescopic rod 27 to extend. The upper arc surface of the positioning plate 28 is in close contact with the inner wall of the center hole of the CNC cutting tool 22. Rotating the positioning bolt 25 so that its end is inserted into the corresponding positioning hole 26, thereby initially positioning the CNC cutting tool 22. Otherwise, the CNC cutting tool 22 can be disassembled. Then, the dual-station CNC machine tool body 1 needs to set the program in advance according to the type of CNC cutting tool 22 to control the turning trajectory of the cutting head on its upper surface. First, pull the push rod 42, and the push rod 42 drives the first piston 41 to slide in the oil pipe 4. The oil in the sealing cover 39 is extracted through the oil pipe 4 and the oil hole 43 at its bottom. The sealing cover 39 extracts the oil between the second piston 52 and the third piston 54 through the second connecting pipe 56. Since the second piston 52 is limited by the limiting ring 51, the negative pressure of extraction causes the third piston 54 to slide closer to the limiting ring 51 and squeeze the return spring 53. As a result, the elastic force of the return spring 53 when it is compressed gradually increases the counter-force of the second piston 52. Therefore, the adhesion force between the friction plate 59 and the inner wall of the center hole of the CNC cutting tool 22 also gradually increases. When the third piston 54 slides, air is extracted from the outside through the first connecting pipe 55 to supplement one side of the third piston 54 to balance the pressure.

[0041] Next, the cutter head is moved to the upper surface of the CNC insert 22 by the control of the dual-station CNC machine tool body 1. At this time, the conical surface of the conical cover 11 is located inside the push rod 42, blocking and limiting the push rod 42. Figure 2 As shown, when the cutting head is set to move clockwise along the upper surface of the CNC insert 22 to cut the chip groove, the tapered cover 11 will move with the cutting head during cutting. The tapered cover 11 will then push the oil pipe 4 to rotate clockwise. Figure 5As shown, the oil pipe 4 rotates in a sealed manner at the top of the sealing cover 39 via a sealing bearing. The oil pipe 4 drives the central shaft 33 to rotate, which in turn drives the first bevel gear 34 on the outer wall to rotate clockwise inside the first fixed seat 3. The first bevel gear 34 also drives the spiral spring 35 to rotate and deform. Because the first bevel gear 34, the second bevel gear 36, and the third bevel gear 37 mesh sequentially, the third bevel gear 37 rotates counterclockwise outside the central shaft 33, causing the connecting disc 38 and the oil pipe 4 to form a coaxial, counter-clockwise motion trajectory. The connecting plate 38 drives the sealing cover 39 to rotate counterclockwise, and the sealing cover 39 drives the friction plate 59 to rotate counterclockwise on the inner wall of the center hole of the CNC insert 22. Thus, the friction resistance generated by the rotation of the friction plate 59 in the center hole of the CNC insert 22 is opposite to the turning trajectory of the tool head, which improves the positioning stability of the CNC insert 22 during turning and reduces the possibility of rotational deviation of the CNC insert 22. During long-term use, the surface of the friction plate 59 will wear, and it can be disassembled and replaced by bolts between the friction plate 59 and the mounting plate 58.

[0042] Finally, on the turning trajectory of the cutting head, since the CNC insert 22 is not a regular circle, the cutting head will move closer to the center hole of the CNC insert 22 as it moves. At this time, the lever arm of the cutting head pushing the CNC insert 22 to cause rotational deviation on the turning trajectory is shortened. Therefore, the force pushing the CNC insert 22 on the turning trajectory by the cutting head also decreases. Then, the push rod 42 begins to move in the opposite direction under the action of the return spring 53. The push rod 42 always fits against the conical surface of the conical cover 11. At the same time, the degree of compression of the return spring 53 will also be restored, so that the elastic force of the return spring 53 when it is compressed reduces the adaptability of the counter-thrust force of the second piston 52. Therefore, the frictional resistance of the friction plate 59 when it rotates against the inner wall of the center hole of the CNC insert 22 is also adaptively reduced, so as to avoid the frictional resistance generated by the friction plate 59 when rotating in the opposite direction being too large and causing the CNC insert 22 to rotate in the opposite direction. Conversely, when the force arm that pushes the CNC insert 22 to rotate in the opposite direction increases, the frictional resistance also increases adaptively until the cutting head turns a complete chip breaking groove on the upper surface of the CNC insert 22. After the machining is completed, the cutting head is reset under the control of the dual-station CNC machine tool body 1, and the CNC insert 22 is pulled upward and separated from the friction plate 59. Under the action of the spiral spring 35, the oil pipe 4 and the friction plate 59 are both rotated and reset.

[0043] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-station CNC turning machine tool for deep machining of cutting tools, comprising a dual-station CNC machine tool body (1), a conical cover (11), a base plate (2), a fixing frame (21), CNC cutting tools (22), and a center column (23), characterized in that, Also includes: The positioning mechanism located on the outer side of the lower end of the central column (23) is used to initially fix the CNC cutting tool (22) placed on the top of the fixing frame (21); An oil pipe (4) is set above the central column (23) and located on one side of the conical cover (11), and the oil pipe (4) is set in an L-shaped structure. A friction plate (59) is provided at the upper end of the central hole of the CNC blade (22), and the upper end of the friction plate (59) is provided with an inclined surface. A coaxial reversing mechanism is set between the central column (23) and the oil pipe (4) to make the friction plate (59) generate frictional resistance opposite to the direction of rotation on the inner wall of the central hole of the CNC cutting tool (22) during the surrounding turning process; An adaptive resistance adjustment mechanism is set between the oil pipe (4) and the coaxial reversing mechanism to adaptively adjust the resistance of the friction plate (59) according to the distance between the turning position and the center of the CNC cutting tool (22) during the surrounding turning process.

2. The dual-station CNC turning machine tool for deep machining of cutting tools according to claim 1, characterized in that: The top of the fixing frame (21) is provided with a through hole corresponding to the center hole of the CNC cutting tool (22); The positioning mechanism includes a movable block (24) that slides with the central column (23). The movable block (24) has a positioning bolt (25) that is threadedly engaged with it in the interior. The outer wall of the central column (23) has positioning holes (26) that fit with the ends of the positioning bolts (25) at equal intervals. The outer wall of the central column (23) is fixed with a first elastic telescopic rod (27) at equal angles above the movable block (24). The telescopic ends of the first elastic telescopic rod (27) are all fixed with positioning plates (28).

3. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 2, characterized in that: The upper outer wall of the movable block (24) is set as a conical surface, and the upper end of the positioning plate (28) is an arc-shaped structure, and the lower end of the positioning plate (28) is attached to the upper outer wall of the movable block (24).

4. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 1, characterized in that: The coaxial reversing mechanism includes a first fixed seat (3) fixedly installed on the top of the central column (23), a second fixed seat (31) is provided on the upper side of the first fixed seat (3), and a third fixed seat (32) corresponding to the first fixed seat (3) is provided above the second fixed seat (31). The first fixing seat (3), the second fixing seat (31) and the third fixing seat (32) are connected and fixed in sequence by connecting rods, and the three fixing seats (3), the second fixing seat (31) and the third fixing seat (32) form a U-shaped structure.

5. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 4, characterized in that: The coaxial reversing mechanism also includes a central shaft (33) rotatably connected to the center of the top of the central column (23). A first bevel gear (34) is fixed to the lower outer wall of the central shaft (33). An inner hole is provided at the center of the first fixed seat (3) and the third fixed seat (32). A spiral spring (35) is connected between the lower outer wall of the first bevel gear (34) and the inner hole wall of the first fixed seat (3). A second bevel gear (36) meshing with the first bevel gear (34) is rotatably connected inside the second fixed seat (31). A third bevel gear (37) meshing with the second bevel gear (36) is provided inside the inner hole of the third fixed seat (32). A connecting disc (38) is fixed to the top of the third bevel gear (37).

6. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 5, characterized in that: The top of the central shaft (33) passes through the connecting plate (38), and the central shaft (33) is fixed to the bottom of the oil pipe (4).

7. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 5, characterized in that: The adaptive resistance adjustment mechanism includes a sealing cover (39) fixed on the top of the connecting plate (38). The top of the sealing cover (39) is connected to the oil pipe (4) through a sealing bearing. The upper end of the oil pipe (4) is provided with a first piston (41) that slides with it. The outer wall of the first piston (41) is connected with a push rod (42) that passes through the upper end port of the oil pipe (4). The bottom of the oil pipe (4) is provided with an oil hole (43).

8. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 7, characterized in that: The adaptive resistance adjustment mechanism also includes a fixed cylinder (5) fixed to the side wall of the sealing cover (39). A limit ring (51) is fixed inside the fixed cylinder (5), and a second piston (52) that slides with the fixed cylinder (5) is provided on one side of the limit ring (51). A return spring (53) is connected to the outer wall of one side of the second piston (52), and a third piston (54) that slides with the fixed cylinder (5) is fixed at the end of the return spring (53).

9. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 8, characterized in that: A first connecting pipe (55) is fixedly provided on one side of the third piston (54) and passes through the bottom of the connecting plate (38). A second connecting pipe (56) is connected between the top of the fixed cylinder (5) near the limiting ring (51) and the sealing cover (39).

10. A dual-station CNC turning machine tool for deep machining of cutting tools according to claim 8, characterized in that: The second piston (52) has a second elastic telescopic rod (57) fixed on the outer wall of the other side, which passes through the end of the fixed cylinder (5). The telescopic end of the second elastic telescopic rod (57) is fixed with a mounting plate (58), and the mounting plate (58) is fixed to the friction plate (59) by bolts.

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