A double-axis CNC lathe with workpiece positioning mechanism

Abstract

The present invention relates to the technical field of CNC lathes, and specifically discloses a double-axis CNC lathe with a workpiece positioning mechanism, comprising a lathe body and a thin-walled tube, wherein a fixed seat and a movable seat are respectively arranged on both sides of the lathe body, a translation component, the translation component is connected to the bed body and cooperates with the movable seat; an external clamping component, the external clamping component is provided with two groups, and is symmetrically connected to the opposite side walls of the movable seat and the fixed seat respectively; an internal clamping component, the internal clamping component is provided with two groups, and is symmetrically connected to the corresponding external clamping components respectively; the present invention utilizes the form of simultaneous internal and external clamping to achieve the effect of applying a large pressure to the thin-walled tube while reducing the deformation of the thin-walled tube, thereby improving the synchronization of the rotation of the thin-walled tube with the chuck during rotation, and the arc surface structure of the adjusting plate 2 can increase the clamped area of ​​the thin-walled tube, thereby improving the stability and safety of the clamping of the thin-walled tube, and improving the quality of the key processing of the thin-walled tube.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled lathes, in particular to a double-axis numerically controlled lathe with a workpiece positioning mechanism. Background Art

[0002] CNC machine tool is the abbreviation of digital control machine tool, which is an automated machine tool equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, express them in coded numbers, and input them into the CNC device through information carriers. After calculation and processing, various control signals are sent by the CNC device to control the action of the machine tool, and automatically process the parts according to the shape and size required by the drawing. Among them, the double-spindle CNC lathe is a computer numerical control lathe, also known as a CNC lathe. It is a CNC machine tool with a large amount of use and a wide coverage in the current domestic industrial manufacturing field, accounting for about a quarter of the total number of CNC machine tools. It is a comprehensive mechatronics product integrating multiple technologies such as information, microelectronics, pneumatics, hydraulics, machinery and electrical. In the field of mechanical manufacturing equipment, it is a working mother machine with the advantages of high precision, high efficiency, high flexibility and high automation.

[0003] At present, when processing thin-shell workpieces, dual-spindle CNC lathes sometimes need to use a three-jaw chuck to tighten the workpiece from the inner cavity of the workpiece, or clamp the workpiece from the outside of the workpiece to the inside, and fix it by the friction between the clamping jaws and the workpiece. In the process of processing thin-walled workpieces, high-speed rotation is usually required. At this time, in order to ensure the quality of workpiece processing, the workpiece and the chuck need to keep a constant relative position when rotating. At this time, the clamping jaw needs to apply a large clamping force to the workpiece. However, if the clamping force applied is too large, due to the thin thickness of thin-walled pipe fittings, the clamping force applied is too large and deformation is easy to occur. If the clamping force applied is too small, during the rotation of the chuck, the clamping force between the clamping jaws and the workpiece may be insufficient. The situation of asynchronous rotation affects the processing quality. In addition, when the current dual-spindle lathe clamps thin-walled pipe fittings with conical ends, the contact area is small, which is also easy to cause unstable clamping and deformation due to concentrated force. To this end, a dual-axis CNC lathe with a workpiece positioning mechanism is proposed. Summary of the invention

[0004] The object of the present invention is to provide a dual-axis CNC lathe with a workpiece positioning mechanism to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a dual-axis CNC lathe with a workpiece positioning mechanism, comprising a lathe body, with a fixed seat and a movable seat respectively arranged on both sides of the lathe body.

[0006] A translation assembly is connected to the lathe body and cooperates with the moving seat, and the translation assembly drives the moving seat to move along the length direction of the lathe body;

[0007] The outer clamping assembly is provided with two groups, and is symmetrically connected to the opposite side walls of the movable seat and the fixed seat respectively. The outer clamping assembly is used to clamp the outer wall arc surfaces at both ends of the thin-walled tube.

[0008] The inner clamping assembly is provided with two groups, and is symmetrically connected to the corresponding outer clamping assembly respectively. The inner clamping assembly is used to support the arc-shaped surfaces of the inner walls at both ends of the thin-walled tube. The outer clamping assembly and the inner clamping assembly can perform double-sided clamping of the thin-walled tube by adjustment.

[0009] Preferably, the translation assembly includes a movable groove opened on the lathe body and along the length direction of the lathe body, the movable groove on the lathe body is internally rotatably connected to a screw rod 1, one end of the screw rod 1 is fixedly connected to a motor, and the movable groove on the screw rod 1 is internally threadedly connected to a nut seat fixedly connected to the movable seat.

[0010] Preferably, the external clamping component includes a hollow chuck fixedly connected to the movable seat and the fixed seat respectively, and a face gear is rotatably connected inside the chuck. A plurality of bevel gears are meshed on one side of the face gear, and a plurality of claws are meshed on the other side of the face gear. The plurality of claws are distributed at equal angles along the center of the chuck, and an external adjustment component is provided on the claw, which is used to adjust the angle of the claw surface and the outer wall of the thin-walled tube.

[0011] Preferably, the external adjustment component includes a mounting groove 1 provided on one side of the clamping surface of the claw, an adjustment plate 1 is rotatably connected inside the mounting groove, a screw rod 2 is threadedly connected inside the claw, the screw rod 2 passes through the interior of the claw, and a knob is fixedly connected to the outer end of the screw rod 2, a transmission block 1 is rotatably connected to the inner end of the screw rod 2, a sliding block 1 is fixedly connected to the end of the transmission block 1, and the sliding block 1 is slidably connected to the adjustment plate 1.

[0012] Preferably, the inner clamping assembly includes a cylindrical mounting plate fixedly connected to the inner diameter of the chuck, a hollow cylindrical support seat is fixedly connected to the side wall of the mounting plate facing the clamping claw, and the support seats on both sides are rotatably connected to the movable seat and the fixed seat on both sides by a transmission shaft, and a plurality of outward expansion components are arranged in a circular array at positions corresponding to the clamping claws on the support seat, which are used to clamp the inner wall of the thin-walled tube.

[0013] Preferably, the outward expansion component includes a plurality of slide grooves arranged in an annular array inside the support seat, the length of the slide grooves is along the radial direction of the support seat and passes through the support seat, a slide rod is slidably connected inside the slide groove, a drive rod is fixedly connected to the slide rod and is perpendicular to the plane formed by the plurality of slide rods, a drive disk is fixedly connected to the transmission shaft, a plurality of arc-shaped drive grooves are arranged on the drive disk and are slidably matched with the corresponding drive rods, one end of the drive groove is close to the center of the drive disk, and the other end is far away from the center of the drive disk, an internal adjustment component is arranged on the slide rod, the internal adjustment component is used to adjust the angle of fit and clamping with the inner wall of the thin-walled tube, a drive component matched with the outward expansion component is arranged inside the chuck, and the drive component is used to provide power for the outward expansion component.

[0014] Preferably, the internal adjustment component includes a cavity opened inside the sliding rod, a micro-cylinder is fixedly connected inside the cavity, a mounting groove 2 is opened on the clamping end face of the sliding rod, an adjustment plate 2 is rotatably connected inside the mounting groove 2, a sliding block 2 is rotatably connected to the free end of the micro-cylinder, the free end of the sliding block 2 is slidably connected to the adjustment plate 2, and an air pipe connected to the outside is provided on one side of the micro-cylinder.

[0015] Preferably, the drive assembly includes a worm wheel fixedly connected to the transmission shaft, a mounting hole is opened on the inner wall of the chuck, a worm is rotatably connected inside the chuck, passes through the mounting hole and engages with the worm wheel, one end of the worm is provided with a hexagonal hole, and the hexagonal hole is connected to the outside of the chuck.

[0016] Preferably, the transmission shaft is a hollow structure, and the transmission shafts on both sides penetrate the movable seat and the fixed seat respectively, and the air pipe penetrates into the interior of the transmission shaft to communicate with the outside.

[0017] Preferably, the surface shape of the adjustment plate 2 is an arc convex outward.

[0018] The present invention has at least the following beneficial effects:

[0019] 1. When the present invention is in use, three claws and screw rod 2 are used to drive the free end of adjusting plate 1 to rotate through transmission of transmission block 1 and sliding block 1 in turn, so that the outer wall of the thin-walled tube with a conical end can be fitted and clamped, and the clamping area is increased. The cooperation of the sliding rod and the micro-cylinder to drive the rotation of adjusting plate 2 through sliding block 2 can realize the inner wall of the thin-walled tube with a conical end, and the clamping area is increased. The position of the inner clamping corresponds to the position of the outer clamping. In addition, the form of simultaneous internal and external clamping can reduce the deformation of the thin-walled tube while applying a large pressure to the thin-walled tube, thereby improving the synchronization of the rotation between the thin-walled tube and the chuck during rotation, and improving the quality of key thin-wall processing.

[0020] 2. The transmission shaft in the present invention is designed as a hollow structure, and the transmission shafts on both sides penetrate the movable seat and the fixed seat respectively, and the air pipe penetrates into the interior of the transmission shaft and communicates with the outside; it can save space in the device and reduce interference between the air pipe and internal parts of the device.

[0021] 3. In the present invention, the surface shape of the adjustment plate 2 is designed to be an arc convex outward. The arc surface structure design of the adjustment plate 2 can further increase the contact area between the adjustment plate 2 and the inner wall of the thin-walled tube, improve the supporting surface of the adjustment plate 2 on the inner wall of the thin-walled tube, and improve the safety of clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is one of the schematic diagrams of the overall three-dimensional structure of the present invention;

[0023] Figure 2 This is the second schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 3 This is one of the schematic diagrams of the main cross-sectional three-dimensional structure of the present invention;

[0025] Figure 4 This is the second schematic diagram of the main cross-sectional three-dimensional structure of the present invention;

[0026] Figure 5 This is the third schematic diagram of the main cross-sectional three-dimensional structure of the present invention;

[0027] Figure 6 This is the fourth schematic diagram of the main cross-sectional three-dimensional structure of the present invention;

[0028] Figure 7 This is the fifth schematic diagram of the main cross-sectional three-dimensional structure of the present invention;

[0029] Figure 8 This is the sixth schematic diagram of the main cross-sectional three-dimensional structure of the present invention;

[0030] Fig. 9 It is a schematic diagram of a side cross-sectional three-dimensional structure of the present invention;

[0031] Fig.10 It is a schematic diagram of the side cross-sectional structure of the thin-walled tube in the present invention.

[0032] In the figure: 1- lathe body; 11- fixed seat; 12- moving seat; 2- external clamping assembly; 21- chuck; 22- face gear; 23- bevel gear; 24- claw; 25- external adjustment assembly; 251- knob; 252- screw rod 2; 253- mounting slot 1; 254- transmission block 1; 255- sliding block 1; 256- adjusting plate 1; 3- internal clamping assembly; 31- mounting plate; 32- support seat; 33- transmission shaft; 34- external expansion assembly; 341- slide slot ;342-slide rod;343-drive disk;344-drive slot;345-drive rod;35-internal adjustment assembly;351-cavity;352-micro cylinder;353-mounting slot two;354-adjusting plate two;355-sliding block two;356-air pipe;36-drive assembly;361-worm gear;362-mounting hole;363-worm;4-translation assembly;41-moving slot;42-screw one;43-motor;44-nut seat;5-thin-walled tube. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-10 The present invention provides a technical solution: Embodiment 1, a dual-axis CNC lathe with a workpiece positioning mechanism, including a lathe body 1 and a thin-walled tube 5. The thin-walled tube 5 in this embodiment is a cylinder in the middle part and cones at both ends. The ends of the cone are open structures. A fixed seat 11 and a movable seat 12 are respectively provided on both sides of the lathe body 1.

[0035] A translation assembly 4, which is connected to the lathe body 1 and cooperates with the moving seat 12, and the translation assembly 4 drives the moving seat 12 to move along the length direction of the lathe body 1;

[0036] The outer clamping assembly 2 is provided with two groups and is symmetrically connected to the opposite side walls of the movable seat 12 and the fixed seat 11 . The outer clamping assembly 2 is used to clamp the outer wall arc surfaces at both ends of the thin-walled tube 5 .

[0037] The inner clamping assembly 3 is provided with two groups, and is symmetrically connected to the corresponding outer clamping assembly 2 respectively. The inner clamping assembly 3 is used to support the inner wall arcs at both ends of the thin-walled tube 5. The outer clamping assembly 2 and the inner clamping assembly 3 can clamp the thin-walled tube on both sides by adjustment; when in use, firstly, the end of the thin-walled tube 5 close to the fixed seat 11 is clamped by the outer clamping assembly 2 and the inner clamping assembly 3 respectively to clamp the outer wall and the inner wall of the thin-walled tube 5, so as to avoid the situation that the thin-walled tube 5 is easily deformed due to excessive pressure, and then the position of the moving seat 12 is adjusted by the translation assembly 4, and then the outer clamping assembly 2 and the inner clamping assembly 3 on the moving seat 12 are used to clamp the outer wall and the inner wall of the other end of the thin-walled tube 5, so as to facilitate the application of pressure on the thin-walled tube 5, while increasing the friction force and reducing the deformation of the thin-walled tube 5, thereby improving the stability of the thin-walled tube 5 during rotation.

[0038] The translation assembly 4 includes a movable groove 41 opened on the lathe body 1 and along the length direction of the lathe body 1. The movable groove 41 on the lathe body 1 is internally rotatably connected to a screw 42, one end of the screw 42 is fixedly connected to a motor 43, and the movable groove 41 on the screw 42 is internally threadedly connected to a nut seat 44 fixedly connected to the movable seat 12; when in use, start the motor 43, the motor 43 drives the screw 42 to rotate, and the rotation of the screw 42 drives the nut seat 44 to move along the axial direction of the screw 42, so that the distance between the movable seat 12 and the fixed seat 11 can be easily adjusted, thereby realizing the clamping and processing of thin-walled tubes 5 of different lengths.

[0039] The outer clamping assembly 2 includes a hollow chuck 21 fixedly connected to the movable seat 12 and the fixed seat 11 respectively, and a face gear 22 is rotatably connected inside the chuck 21. One side of the face gear 22 is a gear tooth surface and meshes with a plurality of bevel gears 23. One end of the bevel gear 23 is an inner hexagonal hole and is connected to the outer wall of the chuck 21. The other side of the face gear 22 is a threaded gear tooth surface and meshes with a plurality of claws 24. The plurality of claws 24 are distributed at equal angles along the center of the chuck 21. In this embodiment, the number of claws 24 and bevel gears 23 are both three, and the angle between adjacent claws 24 is 120°. The claws 24 are provided with There is an external adjustment component 25, which is used to adjust the angle of the clamping between the surface of the clamping claw 24 and the outer wall of the thin-walled tube 5. The external adjustment component 25 includes a mounting groove 253 opened on one side of the clamping surface of the clamping claw 24, and an adjustment plate 256 is rotatably connected inside the mounting groove 253. The free end of the adjustment plate is the end close to the chuck 21. The clamping claw 24 is internally threadedly connected with a screw rod 252, and the screw rod 252 passes through the interior of the clamping claw 24. The outer end of the screw rod 252 is fixedly connected with a knob 251, and the inner end of the screw rod 252 is rotatably connected with a transmission block 254. The transmission block 254 The end of the chuck 21 is fixedly connected with a sliding block 255, and the sliding block 255 is slidably connected with the adjusting plate 256. When in use, when the outer conical surface of the thin-walled tube 5 is clamped, first use the hexagonal wrench to cooperate with the hexagonal hole on the bevel gear 23 to rotate the bevel gear 23, and the rotation of the bevel gear 23 drives the face gear 22 to rotate. The rotation of the face gear 22 then drives the three claws 24 to slide along the radial direction of the chuck 21 through the meshing with the claws 24, thereby realizing the centering and clamping of the outer wall of the thin-walled tube 5, and then turn the knob 251, and the rotation of the knob 251 drives the screw 252 to rotate The screw rod 252 moves toward the center position of the chuck 21 through the threaded cooperation with the claw 24. The movement of the screw rod 252 drives the transmission block 254 to move at the same time. The movement of the transmission block 254 drives the sliding block 255 to slide inside the adjustment plate 256, thereby driving the free end of the adjustment plate 256 to tilt toward the thin-walled tube 5, so that the adjustment plate 256 can be clamped along the inclined surface of the end of the thin-walled tube 5, thereby increasing the clamping area and improving the clamping stability. In this embodiment, the specific structure of the driving mechanism and the turret part that drive the chuck 21 to rotate are not drawn, which is the prior art.

[0040] The inner clamping assembly 3 includes a cylindrical mounting plate 31 fixedly connected to the inner diameter of the chuck 21, a hollow cylindrical support seat 32 is fixedly connected to one side wall of the mounting plate 31 facing the claw 24, and a transmission shaft 33 is rotatably connected between the support seats 32 on both sides and the movable seat 12 and the fixed seat 11 on both sides, respectively, and a plurality of outward expansion assemblies 34 are arranged in an annular array at positions corresponding to the claw 24 on the support seat 32. In this embodiment, there are three outward expansion assemblies 34 for clamping the inner wall of the thin-walled tube 5. The outward expansion assembly 34 includes a plurality of slide grooves 341 arranged in an annular array inside the support seat 32. In the embodiment, there are three slide grooves 341, the length of which is along the radial direction of the support seat 32 and penetrates the support seat 32, a slide rod 342 is slidably connected inside the slide groove 341, a driving rod 345 which is vertically connected to the plane formed by a plurality of slide rods 342 is fixedly connected to the slide rod 342, a driving disk 343 is fixedly connected to the transmission shaft 33, a plurality of arc-shaped driving grooves 344 which are slidably matched with the corresponding driving rods 345 are formed on the driving disk 343, and the number of driving grooves 344 in this embodiment is three, one end of the driving groove 344 is close to the center of the driving disk 343, and the other end is far away from the driving disk 343 The center of the slide bar 342 is provided with an internal adjustment component 35, and the internal adjustment component 35 is used to adjust the angle of the thin-walled tube 5. The internal adjustment component 35 includes a cavity 351 opened inside the slide bar 342, and a micro cylinder 352 is fixedly connected inside the cavity 351. The clamping end surface of the slide bar 342 is provided with a second mounting groove 353, and an adjustment plate 354 is rotatably connected inside the second mounting groove 353. The free end of the adjustment plate 354 is close to the position of the chuck 21, and the free end of the micro cylinder 352 is rotatably connected to a second sliding block 355, and the free end of the second sliding block 355 The micro cylinder 352 is slidably connected to the second adjustment plate 354. An air pipe 356 communicating with the outside is provided on one side of the micro cylinder 352. A driving assembly 36 cooperating with the external expansion assembly 34 is provided inside the chuck 21. The driving assembly 36 is used to provide power for the external expansion assembly 34. The driving assembly 36 includes a worm gear 361 fixedly connected to the transmission shaft 33. A mounting hole 362 is provided on the inner wall of the chuck 21. A worm 363 passing through the mounting hole 362 and meshing with the worm gear 361 is rotatably connected inside the chuck 21. One end of the worm 363 is provided with an inner hexagonal hole, and the inner hexagonal hole is communicated with the outside of the chuck 21.When in use, when it is necessary to clamp the inner wall of the thin-walled tube 5, the worm 363 is rotated with the hexagonal wrench. The rotation of the worm 363 drives the transmission shaft 33 to rotate through the engagement with the worm wheel 361. The rotation of the transmission shaft 33 drives the driving disk 343 to rotate. The rotation of the driving disk 343 drives the driving groove 344 to rotate together. Due to the arc-shaped structural design of the driving groove 344, the driving groove 344 will drive the sliding rod 342 that slides with the driving groove 344 to slide along the sliding groove 341 when rotating, thereby achieving the clamping of the thin-walled tube 5. The inner wall of the thin-walled tube 5 is supported outward, and the position of the slide bar 342 clamping corresponds to the position of the clamping claw 24. When the slide bar 342 contacts the inner wall of the thin-walled tube 5, the three micro cylinders 352 are started at the same time. The free end of the cylinder, i.e., the telescopic end, drives the second slide block 355 to move toward the thin-walled tube 5. The movement of the second slide block 355 drives the free end of the second adjustment plate 354 to rotate so that the inclined surface of the second adjustment plate 354 fits the inner wall of the thin-walled tube 5, increasing the contact area between the adjustment plate and the inner wall of the thin-walled tube 5, thereby increasing the friction and improving the stability. ;

[0041] According to the above embodiment, embodiment 2,

[0042] The transmission shaft 33 is a hollow structure, and the transmission shafts 33 on both sides respectively penetrate the movable seat 12 and the fixed seat 11, and the air pipe 356 penetrates into the interior of the transmission shaft 33 and communicates with the outside; when in use, the transmission shaft 33 is designed to be a hollow structure, and the air pipe 356 is passed from the transmission shaft 33 to the outside of the equipment, which can save space in the device and avoid interference between the air pipe 356 and internal parts of the device.

[0043] According to the above embodiment, embodiment 3,

[0044] The surface shape of the adjustment plate 2 354 is an arc convex outward; when in use, the arc surface structure design of the adjustment plate 2 354 can further increase the contact area between the adjustment plate 2 354 and the inner wall of the thin-walled tube 5, thereby improving the support surface of the adjustment plate 2 354 on the inner wall of the thin-walled tube 5 and improving the safety of clamping.

[0045] According to the above embodiment, embodiment 4,

[0046] The cross-sectional shapes of sliding block 1 255 and sliding block 2 355 are both T-shaped, and the groove cross-sections of adjusting plate 1 256 and adjusting plate 2 354 that slide with sliding block 1 255 and sliding block 2 355 respectively are also T-shaped; when in use, the mutual engagement of the two T-shaped cross-sections is utilized to improve the stability of the connection.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-axis CNC lathe with a workpiece positioning mechanism, comprising a lathe body (1), wherein a fixed seat (11) and a movable seat (12) are respectively arranged on both sides of the lathe body (1); Features: A translation assembly (4), the translation assembly (4) being connected to the lathe body (1) and cooperating with the moving seat (12), the translation assembly (4) driving the moving seat (12) to move along the length direction of the lathe body (1); An external clamping assembly (2), wherein two groups of the external clamping assembly (2) are provided and are symmetrically connected to opposite side walls of the movable seat (12) and the fixed seat (11), respectively, and the external clamping assembly (2) is used to clamp the outer wall arc surfaces at both ends of the thin-walled tube (5); An inner clamping assembly (3), wherein two groups of the inner clamping assembly (3) are provided and are symmetrically connected to the corresponding outer clamping assembly (2), respectively, and the inner clamping assembly (3) is used to support the arc-shaped surfaces of the inner walls at both ends of the thin-walled tube (5); the outer clamping assembly (2) and the inner clamping assembly (3) can clamp the thin-walled tube on both sides by adjusting; The external clamping component (2) comprises a hollow chuck (21) fixedly connected to the movable seat (12) and the fixed seat (11) respectively; a face gear (22) is rotatably connected inside the chuck (21); a plurality of bevel gears (23) are meshed on one side of the face gear (22); a plurality of claws (24) are meshed on the other side of the face gear (22); the plurality of claws (24) are distributed at equal angles along the center of the chuck (21); an external adjustment component (25) is provided on the claw (24); the external adjustment component (25) is used to adjust the angle of the claw (24) surface and the outer wall of the thin-walled tube (5) to fit and clamp; The inner clamping assembly (3) comprises a cylindrical mounting plate (31) fixedly connected to the inner diameter of the chuck (21); a hollow cylindrical support seat (32) is fixedly connected to a side wall of the mounting plate (31) facing the clamping claw (24); transmission shafts (33) are rotatably connected between the support seats (32) on both sides and the movable seats (12) and the fixed seats (11) on both sides respectively; and a plurality of outward expansion assemblies (34) are arranged in a circular array at positions corresponding to the clamping claws (24) on the support seat (32) for clamping the inner wall of the thin-walled tube (5).

2. A dual-axis CNC lathe with a workpiece positioning mechanism according to claim 1, characterized in that: The translation assembly (4) comprises a moving groove (41) formed on the lathe body (1) and extending along the length direction of the lathe body (1); a screw rod (42) is rotatably connected inside the moving groove (41) on the lathe body (1); one end of the screw rod (42) is fixedly connected to a motor (43); and a nut seat (44) fixedly connected to the moving seat (12) is threadedly connected inside the moving groove (41) on the screw rod (42).

3. A dual-axis CNC lathe with a workpiece positioning mechanism according to claim 1, characterized in that: The external adjustment component (25) includes a mounting groove (253) provided on one side of the clamping surface of the clamping claw (24); an adjustment plate (256) is rotatably connected inside the mounting groove (253); a screw rod (252) is threadedly connected inside the clamping claw (24); the screw rod (252) passes through the interior of the clamping claw (24); and a knob (251) is fixedly connected to the outer end of the screw rod (252); a transmission block (254) is rotatably connected to the inner end of the screw rod (252); a sliding block (255) is fixedly connected to the end of the transmission block (254); and the sliding block (255) is slidably connected to the adjustment plate (256).

4. A dual-axis CNC lathe with a workpiece positioning mechanism according to claim 1, characterized in that: The outward expansion component (34) comprises a plurality of slide grooves (341) arranged in an annular array inside the support seat (32), the length of the slide groove (341) being along the radial direction of the support seat (32) and penetrating the support seat (32), a slide rod (342) being slidably connected inside the slide groove (341), a drive rod (345) being fixedly connected to the slide rod (342) and being perpendicular to the plane formed by the plurality of slide rods (342), a drive disk (343) being fixedly connected to the transmission shaft (33), and a plurality of drive disks (343) being provided on the drive disk (343) corresponding to the drive rods (345) and corresponding to the drive rods (345). The movable rod (345) is slidably matched with an arc-shaped driving groove (344), one end of the driving groove (344) is close to the center of the driving disk (343), and the other end is far away from the center of the driving disk (343). The sliding rod (342) is provided with an internal adjustment component (35), and the internal adjustment component (35) is used to adjust the angle of the inner wall of the thin-walled tube (5). The chuck (21) is provided with a driving component (36) matched with the external expansion component (34), and the driving component (36) is used to provide power for the external expansion component (34).

5. A dual-axis CNC lathe with a workpiece positioning mechanism according to claim 4, characterized in that: The internal adjustment component (35) includes a cavity (351) opened inside the sliding rod (342), a micro cylinder (352) is fixedly connected inside the cavity (351), a mounting groove (353) is opened on the clamping end face of the sliding rod (342), an adjustment plate (354) is rotatably connected inside the mounting groove (353), a sliding block (355) is rotatably connected to the free end of the micro cylinder (352), the free end of the sliding block (355) is slidably connected to the adjustment plate (354), and an air pipe (356) connected to the outside is provided on one side of the micro cylinder (352).

6. A dual-axis CNC lathe with a workpiece positioning mechanism according to claim 5, characterized in that: The driving assembly (36) comprises a worm wheel (361) fixedly connected to the transmission shaft (33); a mounting hole (362) is provided on the inner wall of the chuck (21); a worm (363) is rotatably connected inside the chuck (21) and passes through the mounting hole (362) and meshes with the worm wheel (361); one end of the worm (363) is provided with a hexagonal hole, and the hexagonal hole is connected to the outside of the chuck (21).

7. A dual-axis CNC lathe with a workpiece positioning mechanism according to claim 5, characterized in that: The transmission shaft (33) is a hollow structure, and the transmission shafts (33) on both sides respectively penetrate the movable seat (12) and the fixed seat (11), and the air pipe (356) penetrates into the interior of the transmission shaft (33) and communicates with the outside.

8. The dual-axis CNC lathe with a workpiece positioning mechanism according to claim 5, characterized in that: The surface shape of the second adjustment plate (354) is an arc shape convex outwards.

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