Fixture of precise laser cutting machine for precise workpiece machining

Abstract

The invention discloses a clamp of a precise laser cutting machine for precise workpiece machining, and relates to the technical field of precise workpiece machining, the clamp comprises a clamp body and a self-adaptive clamping assembly, a center channel is axially formed in the middle of the clamp body in a penetrating mode, and a round pipe body axially penetrates through the interior of the center channel. According to the clamp of the precise laser cutting machine for precise workpiece machining, the centering function, the feeding function and the rotating function are integrated in the same clamp body, cooperative operation of all the functions is achieved through multi-module linkage, an independent centering device, an independent feeding mechanism and an independent rotating mechanism do not need to be additionally arranged, the overall structure is greatly simplified, and the occupied space of equipment is reduced; the main motor synchronously drives the double chucks to center, the auxiliary motor independently drives feeding and rotation, all actions are connected smoothly, no waiting gap exists, compared with a traditional sectional type machining clamp, the working procedure process is simpler, the machining efficiency is remarkably improved, meanwhile, the workpiece precision loss caused by multiple times of clamping is avoided, and the consistency of precision machining is further guaranteed.

Description

Technical Field

[0001] This invention relates to the field of precision workpiece machining technology, specifically to a fixture for a precision laser cutting machine used for precision workpiece machining. Background Technology

[0002] In the field of precision workpiece machining, laser cutting of round tubes is widely used in industries such as machinery manufacturing, aerospace, automotive parts, and medical devices due to its advantages such as smooth cuts, high precision, and small heat-affected zone. During the laser cutting process, the fixture, as the positioning and motion execution component of the round tube workpiece, directly determines the dimensional accuracy, surface quality, and processing efficiency of the round tube cutting due to its centering accuracy, motion stability, friction control capability, and functional adaptability.

[0003] Currently, existing round tube laser cutting fixtures are mainly modular, independently controlled fixtures. That is, the positioning, axial feeding, and circumferential rotation of the round tube are achieved through independent centering, feeding, and rotating mechanisms, respectively. Although such fixtures can meet basic processing requirements, they have obvious defects. The independent driving of multiple mechanisms can easily lead to deviations in centering coaxiality, and there are waiting gaps between the actions of each mechanism. This not only reduces processing efficiency but may also affect cutting accuracy due to multiple clamping or motion coordination errors. At the same time, the dispersed arrangement of the centering, feeding, and rotating mechanisms makes the overall fixture structure complex, occupies a large space, and the redundancy of parts leads to increased maintenance costs. It is also more difficult to adjust when adapting to workpieces of different diameters.

[0004] To address the aforementioned technical challenges, there is an urgent need to develop a precision laser cutting machine fixture that features high integration, precise mechanical linkage, minimal frictional interference, and strong adaptability. By optimizing the linkage structure design, the fixture can achieve coordinated and efficient operation of centering, feeding, and rotation functions, balancing processing accuracy, surface quality, and processing efficiency to meet the needs of large-scale, high-precision processing of round tube-shaped precision workpieces. Summary of the Invention

[0005] The purpose of this invention is to provide a fixture for a precision laser cutting machine for machining precision workpieces, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fixture for a precision laser cutting machine for precision workpiece processing, comprising a fixture body and an adaptive clamping assembly. The fixture body has a central channel axially extending through its center, and a circular tube body axially passes through the center channel. The adaptive clamping assembly is installed at the rear end of the fixture body. The adaptive clamping assembly includes a feed hole arranged at the rear end of the fixture body. A collar is embedded in the inner wall of the feed hole, and a grooved plate is rotatably mounted inside the collar. A through hole is axially extending through the center of the grooved plate, and the through hole is coaxially connected with the central channel. Three arc-shaped grooves are concentrically arranged on the surface of the grooved plate, and a synchronous belt is sleeved on the outside of the convex ring at the end of the grooved plate. The end of the synchronous belt opposite to the grooved plate is sleeved on the outside of the pulley at the rotating end of the main motor, and the main motor is fixedly installed at the bottom end of the fixture body cavity.

[0007] Furthermore, the front end of the clamp is provided with a discharge hole, and a slag-blocking sleeve is bolted to the outside of the discharge hole opening.

[0008] Furthermore, a base is fixedly installed at the bottom of the clamping body, and the mounting holes on both sides of the base are bolted to the worktable of the laser cutting machine.

[0009] Furthermore, a feeding clamping plate assembly is installed at the front end of the clamping body cavity, and a rotating clamping plate assembly is installed at the rear end of the clamping body cavity.

[0010] Furthermore, the feeding clamping plate group and the rotating clamping plate group are radially arranged at the front and rear ends of the circular tube body along the axial direction, and both the feeding clamping plate group and the rotating clamping plate group are composed of a concentric array of one driving end and two driven ends.

[0011] Furthermore, a connecting bridge connects the feeding clamping plate assembly and the rotating clamping plate assembly, and a guide rod is installed inside the through hole in the middle of the connecting bridge. The top end of the guide rod is fixed to the inner wall of the clamping body cavity, and a return spring is sleeved on the outer periphery of the bottom end of the guide rod.

[0012] Furthermore, the drive end portion of the feeding clamp assembly is composed of an axial feeding module. The axial feeding module includes side plates fixedly installed on both sides of the connecting bridge end. A ball sleeve is fixedly installed at the bottom end of the side plate, and a friction ball rolls freely inside the ball sleeve. The outer circle of the bottom end of the friction ball is in close contact with the side wall of the circular tube body, and the outer circumference of the circular tube body is also in contact with two driven end friction balls in the feeding clamp assembly.

[0013] Furthermore, the axial feeding module also includes a shaft frame fixedly installed on both sides of the top of the ball sleeve. A roller is rotatably installed at the bottom of the shaft frame, and the axis of the roller is perpendicular to the feeding direction of the circular tube body. A toothed ring is recessed in the middle of the roller, and a pad is sleeved on both sides of the roller, and the pad is in close contact with the outer circle of the top of the friction ball.

[0014] Furthermore, the axial feeding module also includes a rotating shaft rotatably mounted on the top of the shaft frame. A driven gear is coaxially fixed in the middle of the rotating shaft, and the outer teeth of the driven gear rotate to the roller through meshing with the gear ring. A transmission gear set is coaxially fixed at the end of the rotating shaft, and the input end of the transmission gear set is fixedly connected to the rotating end of the auxiliary motor.

[0015] Furthermore, the drive end of the rotary clamping plate assembly is composed of a rotary cutting module, and the rotary cutting module and the axial feeding module are respectively fixed at both ends of the connecting bridge. The rotary cutting module and the axial feeding module have the same structure, but the roller axis direction of the rotary cutting module is parallel to the feeding direction of the round tube body and the installation direction of the matching structure is adaptably changed. A pin is fixedly connected to the outer side of the side plate of the rotary cutting module, and the pin slides in the arc groove provided on the surface of the grooved plate. The rotation of the grooved plate driven by the main motor drives the rotary cutting module to center and clamp through the squeezing of the pin by the inner wall of the arc groove. The rotary cutting module synchronously drives the axial feeding module to center and clamp through the connecting bridge. The auxiliary motor in the axial feeding module drives the rollers arranged perpendicular to the feeding direction of the round tube body to rotate, which can drive the round tube body to feed. The auxiliary motor in the rotary cutting module drives the rollers arranged parallel to the feeding direction of the round tube body to rotate, which can drive the round tube body to rotate.

[0016] This invention provides a fixture for a precision laser cutting machine for machining precision workpieces, which has the following beneficial effects; 1. This application integrates centering, feeding, and rotation functions into a single fixture. Through multi-module linkage, the functions work together, eliminating the need for separate centering, feeding, and rotation mechanisms. This significantly simplifies the overall structure and reduces the space occupied by the equipment. The main motor synchronously drives the double chucks for centering, while the auxiliary motor independently drives feeding and rotation. The actions are smoothly connected without any waiting gaps. Compared to traditional segmented machining fixtures, the process flow is simpler, and the processing efficiency is significantly improved. At the same time, it avoids the loss of workpiece accuracy caused by multiple clamping, further ensuring the consistency of precision machining.

[0017] 2. This application adopts a single-drive linkage structure of main motor-grooved plate-pin shaft-connecting bridge. Only one power source is needed to achieve synchronous centering and clamping of the feeding clamping plate group and the rotating clamping plate group, avoiding coaxiality deviation caused by independent driving of the two clamping plates. The transmission of the arc groove and the pin shaft can accurately convert the rotational motion of the grooved plate into the radial translation of the clamping plate group. The friction balls of the three-group centering array contact the round tube at the same time, automatically aligning and centering, which greatly improves the coaxiality of the round tube clamping, laying the foundation for high precision in subsequent feeding and rotary cutting. At the same time, the linkage of the connecting bridge with the guide rod and the return spring ensures uniform and stable clamping force and rapid reset when releasing, which is suitable for the rhythm requirements of batch processing.

[0018] 3. This application achieves differentiated power transmission between the axial feeding module and the rotary cutting module by adjusting the direction of the roller axis and the installation angle of the supporting structure. Relying on the same linkage, they respectively realize the axial feeding and circumferential rotation of the round tube without the need for additional switching of the transmission structure. The operation is simple. When feeding, the roller is arranged perpendicular to the feeding direction, and the power is accurately converted into axial driving force. When rotating, the roller is arranged parallel to the feeding direction, and the power is efficiently converted into circumferential torque. The two sets of modules are independently controlled and do not interfere with each other. The motion mode can be flexibly switched according to the processing requirements, which is suitable for various processing scenarios such as continuous feeding cutting and circumferential pattern cutting.

[0019] 4. This application innovatively uses friction balls to replace traditional rollers, and in conjunction with the linkage drive structure of roller-pad, it completely transforms sliding friction into pure rolling friction. The friction balls can roll freely in all directions within the ball sleeve. When the round tube is axially fed or rotated circumferentially, the friction balls can roll adaptively with the round tube without any sliding friction interference, which greatly reduces motion resistance and workpiece surface wear, and avoids the round tube from being affected by friction damage, thus improving machining accuracy. At the same time, the roller and friction balls are tightly fitted through the pad, resulting in efficient power transmission. Combined with the support and guidance of the double driven friction balls, it ensures the accuracy of feeding step and rotation angle, meeting the requirements of precision machining. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the split structure of the device of the present invention; Figure 3 This is a schematic diagram of the axial cross-sectional structure of the device of the present invention; Figure 4 This is a radial cross-sectional view of the device of the present invention; Figure 5 This is a schematic diagram of the external structure of the axial feeding module and the rotary cutting module of the present invention; Figure 6 This is a schematic diagram of the internal structure of the axial feeding module and the rotary cutting module of the present invention; Figure 7 This is a cross-sectional view of the axial feeding module of the present invention. Figure 8 This is a cross-sectional view of the axial feeding module of the present invention.

[0021] In the diagram: 1. Clamp body; 2. Central channel; 3. Circular tube body; 4. Adaptive clamping assembly; 401. Feed hole; 402. Shaft collar; 403. Groove plate; 404. Through hole; 405. Arc groove; 406. Synchronous belt; 407. Main motor; 5. Discharge hole; 6. Slag-blocking sleeve; 7. Base; 8. Mounting hole; 9. Feeding clamping plate assembly; 10. Rotating clamping plate assembly; 11. Connecting bridge; 12. Guide rod; 13. Return spring; 14. Axial feeding module; 1401. Side plate; 1402. Ball sleeve; 1403. Friction ball; 1404. Shaft bracket; 1405. Roller; 1406. Gear ring; 1407. Pad; 1408. Rotating shaft; 1409. Driven gear; 1410. Transmission gear set; 1411. Auxiliary motor; 15. Rotary cutting module; 16. Pin shaft. Detailed Implementation

[0022] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. Please see Figures 1 to 3 This invention provides a technical solution: a fixture for a precision laser cutting machine for precision workpiece processing, comprising a fixture body 1 and an adaptive clamping assembly 4. The fixture body 1 has a central channel 2 axially extending through its middle, and a circular tube body 3 axially passes through the central channel 2. The adaptive clamping assembly 4 is installed at the rear end of the fixture body 1. The adaptive clamping assembly 4 includes a feed hole 401 arranged at the rear end of the fixture body 1. A collar 402 is embedded in the inner wall of the feed hole 401, and a grooved plate 403 is rotatably installed inside the collar 402. A through hole 404 is axially extending through the middle of the grooved plate 403, and the through hole 404 is coaxially connected with the central channel 2. Three arc-shaped grooves 405 are concentrically arranged on the surface of the grooved plate 403, and a synchronous belt 406 is sleeved on the outside of the convex ring at the end of the grooved plate 403. The end of the synchronous belt 406 facing away from the grooved plate 403 is sleeved on the outside of the pulley at the rotating end of the main motor 407, and the main motor 407 is fixedly installed at the bottom end of the cavity of the fixture body 1. The specific operation is as follows: the centering and clamping action is achieved by a closed-loop linkage formed by the main motor 407, the slotted plate 403, the pin 16, the connecting bridge 11, and the double clamping plate assembly, realizing one-time drive and bidirectional synchronous clamping. After the main motor 407 is started, its rotating end pulley drives the slotted plate 403 to rotate around the shaft ring 402 through the synchronous belt 406. The three concentric arc-shaped grooves 405 on the surface of the slotted plate 403 rotate together. Since the pin 16 on the outer side plate 1401 of the rotary cutting module 15 is embedded in the arc-shaped groove 405, the inner wall of the arc-shaped groove 405 generates radial extrusion force on the pin 16 during rotation, pushing the rotary cutting module 15 to move radially along the guide rod 12. The entire linkage process is driven by only a single main motor 407 to achieve synchronous centering of the double clamping plate assembly and ensure clamping. Regarding coaxiality, this application adopts a single-drive linkage structure of main motor 407-groove plate 403-pin shaft 16-connecting bridge 11. Only one power source is needed to achieve synchronous centering and clamping of feeding clamping plate group 9 and rotating clamping plate group 10, avoiding coaxiality deviation caused by independent drive of dual clamping plates. The transmission of arc groove 405 and pin shaft 16 can accurately convert the rotational motion of groove plate 403 into radial translation of clamping plate group. The friction balls 1403 of the three-group centering array contact the round tube at the same time, automatically aligning and centering, which greatly improves the coaxiality of round tube clamping, laying the foundation for high precision of subsequent feeding and rotary cutting. At the same time, the linkage of connecting bridge 11 with guide rod 12 and return spring 13 ensures uniform and stable clamping force and rapid reset of release action, which is suitable for the rhythm requirements of batch processing. Please see Figures 3 to 6 The clamp body 1 has a discharge hole 5 at the front end, and a slag-blocking sleeve 6 is bolted to the outside of the discharge hole 5. The clamp body 1 has a base 7 fixedly installed at the bottom end, and the mounting holes 8 on both sides of the base 7 are bolted to the worktable of the laser cutting machine. The clamp body 1 has a feeding clamping plate group 9 installed at the front end of the cavity, and a rotating clamping plate group 10 installed at the rear end of the cavity. The feeding clamping plate group 9 and the rotating clamping plate group 10 are radially arranged at the front and rear ends of the circular tube body 3 along the axis. The feeding clamping plate group 9 and the rotating clamping plate group 10 are both composed of a concentric array of one driving end and two driven ends. The feeding clamping plate group 9 and the rotating clamping plate group 10 are connected by a connecting bridge 11, and a guide rod 12 is installed inside the through hole in the middle of the connecting bridge 11. The top end of the guide rod 12 is fixed to the inner wall of the cavity of the clamp body 1, and a return spring 13 is sleeved on the outer periphery of the bottom end of the guide rod 12. The specific operation is as follows: Since the rotary cutting module 15 and the axial feeding module 14 are fixedly connected by the connecting bridge 11, the connecting bridge 11 moves synchronously with the rotary cutting module 15, thereby driving the axial feeding module 14 to move radially synchronously, so that the driving end and driven end friction ball 1403 of the feeding clamping plate group 9 and the rotary clamping plate group 10 simultaneously approach the round tube body 3. Finally, the friction ball 1403 of the three groups of centered arrays tightly abuts against the outer circumference of the round tube, completing the centering clamping. During the clamping process, the return spring 13 on the outer circumference of the guide rod 12 is in a compressed state, providing reset power for the subsequent release action. Please see Figures 5 to 8 The drive end portion of the feeding clamp assembly 9 is composed of an axial feeding module 14. The axial feeding module 14 includes side plates 1401 fixedly installed on both sides of the end of the connecting bridge 11. A ball sleeve 1402 is fixedly installed at the bottom of the side plate 1401, and a friction ball 1403 rolls freely inside the ball sleeve 1402. The outer circle of the bottom end of the friction ball 1403 is in close contact with the side wall of the circular tube body 3. Moreover, the outer circumference of the circular tube body 3 is also in contact with two driven end friction balls 1403 in the feeding clamp assembly 9. The axial feeding module 14 also includes a shaft bracket 1404 fixedly installed on both sides of the top end of the ball sleeve 1402. The bottom end of the shaft bracket 1404 is rotatably mounted inside. The axial feeding module 14 includes a roller 1405, the axis of which is perpendicular to the feeding direction of the cylindrical tube body 3. A toothed ring 1406 is recessed in the middle of the roller 1405, and pads 1407 are fitted on both sides of the roller 1405. The pads 1407 are in close contact with the outer circle of the top of the friction ball 1403. The axial feeding module 14 also includes a rotating shaft 1408 rotatably mounted inside the top of the shaft frame 1404. A driven gear 1409 is coaxially fixed in the middle of the rotating shaft 1408, and the outer teeth of the driven gear 1409 rotate the roller 1405 through meshing with the toothed ring 1406. A transmission gear set 14 is coaxially fixed at the end of the rotating shaft 1408. 10, and the input end of the transmission gear set 1410 is fixedly connected to the rotating end of the auxiliary motor 1411. The drive end part of the rotating chuck assembly 10 is composed of the rotating cutting module 15, and the rotating cutting module 15 and the axial feeding module 14 are respectively fixed to the two ends of the connecting bridge 11. The rotating cutting module 15 and the axial feeding module 14 have the same structure, but the axial direction of the roller 1405 in the rotating cutting module 15 is parallel to the feeding direction of the round tube body 3 and the installation direction of the matching structure is adaptable to the change. The outer side of the side plate 1401 of the rotating cutting module 15 is fixedly connected to the pin 16, and the pin 16 is located on the surface of the grooved plate 403. Suppose that the sliding is inside the arc groove 405, the rotation of the lower groove plate 403 driven by the main motor 407 causes the pin 16 to be squeezed by the inner wall of the arc groove 405, thereby driving the rotary cutting module 15 to be centered and clamped. The rotary cutting module 15 is synchronously driven by the connecting bridge 11 to the axial feeding module 14 for centered clamping. The auxiliary motor 1411 in the axial feeding module 14 drives the roller 1405, which is vertically arranged along the feeding direction of the circular tube body 3, to rotate, thereby driving the circular tube body 3 to feed. Moreover, the auxiliary motor 1411 in the rotary cutting module 15 drives the roller 1405, which is parallel to the feeding direction of the circular tube body 3, to rotate, thereby driving the circular tube body 3 to rotate. The specific operation is as follows: the feeding action is achieved by the gear-roller 1405-friction ball 1403 linkage chain inside the axial feeding module 14, which accurately transmits power and controls the feeding accuracy. The auxiliary motor 1411 of the axial feeding module 14 is activated. The rotational power of the auxiliary motor 1411 is transmitted to the rotating shaft 1408 through the transmission gear set 1410, which drives the driven gear 1409 fixed coaxially in the middle of the rotating shaft 1408 to rotate synchronously. The driven gear 1409 drives the gear ring 1406 in the middle of the roller 1405 through gear tooth meshing, so that the roller 1405 rotates around its own axis. As the roller 1405 rotates, its axis is perpendicular to the feeding direction of the circular tube. Because the pads 1407 on both sides of the roller 1405 are tightly fitted with the friction balls 1403 below, the friction between the pads 1407 and the friction balls 1403 drives the friction balls 1403 to rotate during rotation. The friction balls 1403 roll axially along the feeding direction of the circular tube, and the static friction between the friction balls 1403 and the circular tube body 3 drives the circular tube to feed in a stepwise manner. During this process, the two driven friction balls 1403 of the feeding clamp assembly 9 only serve a supporting and guiding function. It does not participate in power transmission, ensuring the stability of the circular tube's posture during feeding, without deviation or wobbling. The rotary cutting action relies on the homogeneous structure of the rotary cutting module 15 and the axial feeding module 14, with differentiated installation directions. The power transmission path is consistent with the feeding action, only the direction of movement is adjusted for adaptation. When the auxiliary motor 1411 of the rotary cutting module 15 is started, the power is transmitted sequentially to the roller 1405 via the transmission gear set 1410, the rotating shaft 1408, the driven gear 1409, and the gear ring 1406. The axis of the roller 1405 is parallel to the feeding direction of the circular tube. The mounting direction of the matching gears, shaft frame 1404 and other structures is synchronously adjusted to drive the roller 1405 to rotate. The roller 1405 drives the friction ball 1403 to roll radially along the feeding direction of the round tube through the pads 1407 on both sides. The static friction between the friction ball 1403 and the round tube body 3 is converted into circumferential torque, which drives the round tube body 3 to rotate. In conjunction with the laser cutting head, the pattern cutting in the circumferential direction is completed. At this time, the two driven ends of the friction ball 1403 of the rotating chuck assembly 10 perform adaptive pure rolling with the rotation of the round tube to ensure the rotation accuracy of the round tube and avoid motion interference.

[0023] In summary, when using the fixture of a precision laser cutting machine for machining precision workpieces: First, the centering and clamping action is achieved through a closed-loop linkage formed by the main motor 407, the slotted disc 403, the pin 16, the connecting bridge 11, and the double clamping disc assembly, realizing one-time drive and bidirectional synchronous clamping. After the main motor 407 is started, its rotating end pulley drives the slotted disc 403 to rotate around the shaft ring 402 via the synchronous belt 406. The three concentric arc-shaped grooves 405 on the surface of the slotted disc 403 rotate together. Since the pin 16 on the outer side plate 1401 of the rotary cutting module 15 is embedded in the arc-shaped groove 405, the inner wall of the arc-shaped groove 405 is... During rotation, radial extrusion force is generated on the pin 16, pushing the rotary cutting module 15 to move radially along the guide rod 12. Since the rotary cutting module 15 and the axial feeding module 14 are fixedly connected by the connecting bridge 11, the connecting bridge 11 moves synchronously with the rotary cutting module 15, thereby driving the axial feeding module 14 to move radially synchronously. This causes the driving end and driven end friction balls 1403 of the feeding chuck assembly 9 and the rotary chuck assembly 10 to simultaneously approach the circular tube body 3. Finally, the three groups of centered arrayed friction balls 1403 and the outer circumference of the circular tube... The material clamps tightly against the guide rod 12, completing the centering and clamping process. During clamping, the return spring 13 on the outer periphery of the guide rod 12 is compressed, providing reset power for the subsequent release action. The entire linkage process is driven by a single main motor 407, achieving synchronous centering of the two clamping plates and ensuring clamping coaxiality. This application adopts a single-drive linkage structure of main motor 407-groove plate 403-pin shaft 16-connecting bridge 11, which can achieve synchronous centering and clamping of the feeding clamping plate group 9 and the rotating clamping plate group 10 with only one power source, avoiding the independent clamping of the two clamping plates. The coaxiality deviation caused by the vertical drive is precisely converted into the radial translation of the chuck assembly by the transmission of the arc groove 405 and the pin shaft 16. The friction balls 1403 of the three-group self-aligned array contact the round tube at the same time, automatically align and center, which greatly improves the coaxiality of the round tube clamping, laying the foundation for high precision in subsequent feeding and rotary cutting. At the same time, the linkage between the connecting bridge 11, the guide rod 12, and the return spring 13 ensures that the clamping force is uniform and stable, and the release action is quick and reset, which is suitable for the rhythm requirements of batch processing. Secondly, the feeding action is achieved by the gear-roller 1405-friction ball 1403 linkage chain inside the axial feeding module 14, which accurately transmits power and controls the feeding accuracy. The auxiliary motor 1411 of the axial feeding module 14 is activated, and the rotational power of the auxiliary motor 1411 is transmitted to the rotating shaft 1408 via the transmission gear set 1410. This drives the driven gear 1409, which is coaxially fixed in the middle of the rotating shaft 1408, to rotate synchronously. The driven gear 1409 drives the gear ring 1406 in the middle of the roller 1405 through gear meshing, causing the roller 1405 to rotate around its own axis. The axis of the roller 1405 is aligned with the circular tube. The feeding direction is vertical. Since the pads 1407 on both sides of the roller 1405 are in close contact with the friction balls 1403 below, when the roller 1405 rotates, the friction between the pads 1407 and the friction balls 1403 drives the friction balls 1403 to rotate. The friction balls 1403 roll axially along the feeding direction of the round tube, and then the static friction between the friction balls 1403 and the round tube body 3 drives the round tube to step forward for feeding. During this process, the two driven end friction balls 1403 of the feeding chuck group 9 only play a supporting and guiding role and do not participate in power transmission, ensuring that the round tube is stable in posture and has no deviation or shaking during the feeding process. Then, the rotary cutting action relies on the homogeneous structure of the rotary cutting module 15 and the axial feeding module 14, with differentiated installation directions. The power transmission path is consistent with the feeding action, only the direction of movement is adjusted. The auxiliary motor 1411 of the rotary cutting module 15 is started, and the power is transmitted to the roller 1405 in sequence through the transmission gear set 1410, the rotating shaft 1408, the driven gear 1409, and the gear ring 1406. The axis of the roller 1405 is parallel to the feeding direction of the circular tube, and it is equipped with gears, shaft brackets 1404, etc. The installation direction of the structure is synchronously adapted and adjusted, which drives the roller 1405 to rotate. The roller 1405 drives the friction ball 1403 to roll radially along the feeding direction of the round tube through the pads 1407 on both sides. The static friction between the friction ball 1403 and the round tube body 3 is converted into circumferential torque, which drives the round tube body 3 to rotate. In conjunction with the laser cutting head, the pattern cutting in the circumferential direction is completed. At this time, the two driven friction balls 1403 of the rotating chuck assembly 10 perform adaptive pure rolling with the rotation of the round tube to ensure the rotation accuracy of the round tube and avoid motion interference. Finally, this application, on the one hand, by adjusting the axial direction of roller 1405 and the installation angle of the supporting structure, enables the axial feeding module 14 and the rotary cutting module 15 to form differentiated power transmission. Relying on the same auxiliary motor 1411-gear set-roller 1405-friction ball 1403 linkage chain, the axial feeding and circumferential rotation of the round tube are realized respectively, without the need for additional switching of the transmission structure, making operation simple. During feeding, roller 1405 is arranged perpendicular to the feeding direction, and the power is accurately converted into axial driving force. During rotation, roller 1405 is arranged parallel to the feeding direction, and the power is efficiently converted into circumferential torque. The two modules are independently controlled and do not interfere with each other. The motion mode can be flexibly switched according to processing requirements, adapting to various processing scenarios such as continuous feeding cutting and circumferential pattern cutting. On the other hand, this application innovatively uses a friction ball 1403 to replace the traditional roller, and in conjunction with the linkage drive structure of roller 1405-shield 1407, the sliding friction is completely transformed into pure rolling friction. The friction ball 1403 can roll freely in all directions within the ball sleeve 1402. When the round tube is axially fed or rotated circumferentially, the friction ball 1403 can roll adaptively with the round tube without any sliding friction interference, which greatly reduces motion resistance and workpiece surface wear, and avoids the round tube from being affected by friction damage, thus affecting the processing accuracy. At the same time, the roller 1405 and the friction ball 1403 are closely fitted through the shield 1407, and the power transmission is efficient. With the support and guidance of the double driven end friction ball 1403, the feeding step accuracy and rotation angle accuracy are ensured, meeting the requirements of precision machining.

[0024] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A fixture for a precision laser cutting machine for machining precision workpieces, comprising a fixture body (1) and an adaptive clamping assembly (4), characterized in that, The clamping body (1) has a central channel (2) axially extending through its middle, and a circular tube body (3) axially passes through the central channel (2). The adaptive clamping assembly (4) is installed at the rear end of the clamping body (1). The adaptive clamping assembly (4) includes a feed hole (401) located at the rear end of the clamping body (1). A collar (402) is embedded in the inner wall of the feed hole (401), and a grooved disc (403) is rotatably mounted inside the collar (402). 03) A through hole (404) is provided through the central axis, and the through hole (404) is coaxially connected with the central channel (2). The grooved plate (403) has three arc-shaped grooves (405) arranged concentrically on the plate surface. A synchronous belt (406) is sleeved on the outside of the convex ring at the end of the grooved plate (403). The end of the synchronous belt (406) away from the grooved plate (403) is sleeved on the outside of the pulley at the rotating end of the main motor (407). The main motor (407) is fixedly installed at the bottom of the cavity of the clamping body (1).

2. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 1, characterized in that, The front end of the clamping body (1) is provided with a discharge hole (5), and a slag-blocking sleeve (6) is bolted to the outside of the discharge hole (5).

3. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 2, characterized in that, The clamping body (1) is fixedly mounted with a base (7) at its bottom end, and the mounting holes (8) on both sides of the base (7) are bolted to the worktable of the laser cutting machine.

4. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 3, characterized in that, The front end of the clamping body (1) is equipped with a feeding clamping plate assembly (9), and the rear end of the clamping body (1) is equipped with a rotating clamping plate assembly (10).

5. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 4, characterized in that, The feeding clamping plate group (9) and the rotating clamping plate group (10) are radially arranged at the front and rear ends of the circular tube body (3) along the axial direction, and both the feeding clamping plate group (9) and the rotating clamping plate group (10) are composed of a concentric array of one driving end and two driven ends.

6. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 5, characterized in that, The feeding clamping plate group (9) and the rotating clamping plate group (10) are connected by a connecting bridge (11), and a guide rod (12) is installed inside the through hole in the middle of the connecting bridge (11). The top end of the guide rod (12) is fixed to the inner wall of the clamping body (1) cavity, and a reset spring (13) is sleeved on the outer periphery of the bottom end of the guide rod (12).

7. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 6, characterized in that, The drive end portion of the feeding clamp assembly (9) is composed of an axial feeding module (14). The axial feeding module (14) includes a side plate (1401) fixedly installed on both sides of the end of the connecting bridge (11). A ball sleeve (1402) is fixedly installed at the bottom of the side plate (1401), and a friction ball (1403) rolls freely inside the ball sleeve (1402). The outer circle of the bottom end of the friction ball (1403) is in close contact with the side wall of the round tube body (3), and the outer periphery of the round tube body (3) is also in contact with two driven end friction balls (1403) in the feeding clamp assembly (9).

8. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 7, characterized in that, The axial feeding module (14) also includes a shaft frame (1404) fixedly installed on both sides of the top end of the ball sleeve (1402). A roller (1405) is rotatably installed at the bottom of the shaft frame (1404), and the axis of the roller (1405) is perpendicular to the feeding direction of the circular tube body (3). A toothed ring (1406) is recessed in the middle of the roller (1405), and a pad (1407) is sleeved on both sides of the roller (1405). The pad (1407) is in close contact with the outer circle of the top end of the friction ball (1403).

9. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 8, characterized in that, The axial feeding module (14) also includes a rotating shaft (1408) rotatably mounted on the top of the inside of the shaft frame (1404). A driven gear (1409) is coaxially fixed in the middle of the rotating shaft (1408), and the outer teeth of the driven gear (1409) rotate to the roller (1405) through meshing with the gear ring (1406). A transmission gear set (1410) is coaxially fixed at the end of the rotating shaft (1408), and the input end of the transmission gear set (1410) is fixedly connected to the rotating end of the auxiliary motor (1411).

10. The fixture for a precision laser cutting machine for precision workpiece machining according to claim 9, characterized in that, The drive end of the rotating chuck assembly (10) is composed of a rotating cutting module (15), and the rotating cutting module (15) and the axial feeding module (14) are respectively fixed at both ends of the connecting bridge (11). The rotating cutting module (15) and the axial feeding module (14) have the same structure, but the axis of the roller (1405) in the rotating cutting module (15) is parallel to the feeding direction of the round tube body (3) and the installation direction of the matching structure is adaptably changed. A pin (16) is fixedly connected to the outer side of the side plate (1401) of the rotating cutting module (15), and the pin (16) slides in the arc groove (405) provided on the surface of the slotted plate (403). The main motor ( 407) The rotation of the drive lower groove plate (403) is driven by the squeezing of the pin shaft (16) by the inner wall of the arc groove (405) to drive the rotary cutting module (15) to center and clamp. The rotary cutting module (15) is synchronously driven by the connecting bridge (11) to center and clamp the axial feeding module (14). The auxiliary motor (1411) in the axial feeding module (14) is activated to drive the roller (1405) set vertically along the feeding direction of the round tube body (3) to rotate, which can drive the round tube body (3) to feed. The auxiliary motor (1411) in the rotary cutting module (15) is activated to drive the roller (1405) set parallel along the feeding direction of the round tube body (3) to rotate, which can drive the round tube body (3) to rotate.

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