A positioning device for a die-bonding machine

Abstract

The utility model relates to positioning device technical field, concretely relates to a kind of bar machine positioning device, comprising: cabinet body;Conveying mechanism, set on cabinet body, for conveying the bar stock to be processed along predetermined path;At least one set of oppositely arranged axial holding mechanism, set on cabinet body and located the side of bar stock to be processed, for constraining the movement freedom of bar stock to be processed along its axial direction;It seamlessly adapts arbitrary diameter bar stock through synchronous bidirectional opening and closing mechanism, simultaneously innovatively uses multiple radial clamping units time-sharing cooperation-when bar stock advances, current station clamping jaw is rigidly locked by drive cylinder, adjacent clamping jaw is actively loosened and resets quickly by spring, after bar stock moves set stroke, reset clamping jaw immediately clamps pipe and restricts task, original clamping jaw is simultaneously released and resets, form dynamic alternation "clamping-release-reset" circulation chain, this process completely eliminates the tendency of bar stock radial rotation.

Description

Technical Field

[0001] This utility model relates to the field of positioning device technology, specifically a positioning device for a sliding headstock machine. Background Technology

[0002] A Swiss-type lathe is a high-precision CNC lathe mainly used for continuous machining of slender and complex shaft parts. It achieves efficient cutting through the linkage of the spindle and the cutting tool. With its high speed and multi-station characteristics, it is widely used in the field of precision manufacturing. The positioning device, as a key auxiliary component, can accurately fix the position of the workpiece and reduce displacement errors during the machining process. Through its cooperation with the spindle and the cutting tool, it ensures dimensional accuracy and machining stability, and is an important support for improving the machining quality and efficiency of Swiss-type lathes.

[0003] Positioning devices play a fundamental and crucial role in the mass production of precision parts, but they still have certain problems: 1) Traditional equipment relies on fixed fixtures, and switching between bars of different diameters requires stopping the machine for disassembly and assembly, which seriously restricts the pace of continuous production and increases the cost of manual intervention; 2) Due to the lack of dynamic constraint mechanisms, existing technologies are prone to circumferential deflection of the bar during continuous movement due to inertial forces or equipment vibrations, resulting in cumulative errors in processing; Therefore, in view of the above situation, it is urgent to develop a positioning device for Swiss-type lathes to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content

[0004] The purpose of this invention is to provide a positioning device for a Swiss-type lathe to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a positioning device for a Swiss-style lathe, comprising:

[0006] Cabinet;

[0007] The conveying mechanism, mounted on the cabinet, is used to convey the bar stock to be processed along a predetermined path;

[0008] At least one set of axially retaining mechanisms arranged opposite to each other are mounted on the cabinet and located on the side of the bar stock to be processed, for constraining the degree of freedom of movement of the bar stock along its axial direction; the axial retaining mechanism includes a mounting frame a, a moving part, a roller, an internal threaded sleeve and a double-acting screw, the double-acting screw is rotatably mounted on the mounting frame a, the internal threaded sleeve passes through the middle position of the moving part, the moving part and the double-acting screw are connected by transmission through the internal threaded sleeve, a roller is mounted at the end of the moving part, and a motor c for driving the double-acting screw to rotate is mounted on the outside of the mounting frame a;

[0009] The drive mechanism, located inside the cabinet, is used to drive at least one set of axially retaining mechanisms arranged opposite each other to move towards or away from each other, in order to adapt to bars of different diameters to be processed.

[0010] At least one radial holding mechanism is disposed on the cabinet and located radially outside the bar stock to be processed, for constraining the degree of freedom of movement of the bar stock in a plane perpendicular to its axial direction; the radial holding mechanism includes a sliding shaft frame, a sliding sleeve, a telescopic arm, a mounting base, a drive cylinder, a gripper, a limiting plate, and a spring. The sliding shaft frame is fixed at the edge of the upper surface of the cabinet, the sliding sleeve is slidably mounted on the sliding shaft frame, the telescopic arm is obliquely fixed at the edge of the sliding sleeve, the mounting base is fixed at the bottom end of the telescopic arm, the drive cylinder is mounted on the mounting base, the gripper is drivenly connected to the drive cylinder, the limiting plate is sleeved on the sliding shaft frame, and a spring is installed between the sliding sleeve and the limiting plate.

[0011] Specifically, the conveying mechanism efficiently transports the bar stock to be processed along a predetermined path, while at least one set of opposing axial holding mechanisms constrains the axial movement freedom of the bar stock. The mounting bracket, moving parts, rollers, internal threaded sleeves, and bidirectional lead screws work in conjunction with a motor to achieve precise adjustment. The drive mechanism drives the axial holding mechanisms to move in opposite directions to adapt to bars of different diameters, improving the equipment's versatility and flexibility. At least one radial holding mechanism constrains the radial movement freedom of the bar stock. Its sliding frame, sliding sleeve, telescopic arm, mounting base, drive cylinder, gripper, limit plate, and spring work together to provide stable clamping and buffering, reduce processing vibration, and ensure high precision, high efficiency, and high reliability of the overall processing.

[0012] Preferably, the drive mechanism includes a movable frame, slider a, slide rail a, motor b, gear, rack and pinion, and suspension. Several parallel slide rails a are fixed to the top of the cabinet, and several sliders a are fixed to the movable frame. The movable frame is slidably connected to the slide rails a through the sliders a. The motor b is vertically mounted to the top of the cabinet, the gear is mounted on the output end of the motor b, the rack is fixed to the movable frame and meshes with the gear, and several suspensions are vertically mounted to the movable frame. Several through slots are provided on the upper surface of the cabinet, and the suspensions are movably inserted into the through slots. The mounting frame a is fixed to the top of the suspension.

[0013] Specifically, the highly stable translational motion is achieved through the cooperation of the moving frame, slider a, and slide rail a. The motor b drives the gear meshing rack to provide precise and controllable linear driving force. The suspension passes through the cabinet through slot to transmit power to the mounting frame a, thereby synchronously driving multiple sets of axial holding mechanisms to move in opposite directions or in opposite directions, ensuring rapid and accurate adaptation of bars of different diameters. At the same time, the overall structure has high rigidity and high transmission efficiency, which significantly improves the reliability and automation level of equipment adjustment.

[0014] Preferably, the conveying mechanism includes a bearing seat, a rotating shaft, a drive wheel, a transmission box, and a motor a. Several bearing seats are equidistantly installed at the center of the upper surface of the cabinet. The rotating shaft is rotatably inserted into the bearing seat. The drive wheel is installed in the middle section of the rotating shaft. The transmission box is installed on the cabinet and the rotating shaft is connected to the transmission box for transmission. The motor a is installed on the side wall of the cabinet and the transmission box is connected to the motor a for drive.

[0015] Specifically, the equidistant arrangement of the bearing seats provides stable support, and the cooperation between the rotating shaft and the drive wheel enables efficient linear conveying of the bar stock. The transmission box centrally drives multiple rotating shafts to ensure motion synchronization. The side-mounted layout of the motor optimizes space utilization. The overall structure is compact and the power transmission is reliable, which significantly improves the smoothness and positioning accuracy of the bar stock conveying, laying an efficient and stable foundation for subsequent processing procedures. The transmission box integrates a sprocket and chain structure.

[0016] Preferably, the drive mechanism has two movable frames, each with a rack installed on it, and both racks mesh with gears simultaneously and are horizontally distributed relative to each other.

[0017] Specifically, by configuring a rack on each of the two moving frames and maintaining a horizontally opposite distribution, the two racks mesh with the same gear simultaneously, forming a symmetrical bidirectional drive structure. This ensures that the two moving frames move in strict synchronous and opposite directions under the drive of motor b, completely eliminating the off-center load or asynchronous phenomenon that may occur with single-sided drive. This greatly improves the positioning accuracy and dynamic balance of the axial holding mechanism in opposite directions, while also enhancing the rigidity and transmission stability of the overall structure. It provides a more reliable and efficient adjustment mechanism for adapting to bars of different diameters.

[0018] Preferably, a vertically arranged slide rail b is installed on the inner wall of the mounting bracket a, a slider b is installed at one end of the moving part adjacent to the slide rail b, the slider b is slidably connected to the slide rail b, a sprocket a is installed at the output end of the motor c, a sprocket b is installed at the end of the bidirectional lead screw, and a chain belt for transmission is installed between the sprocket a and the sprocket b.

[0019] Specifically, the vertical sliding cooperation between the slide rail b and the slider b provides a highly rigid linear guide for the moving part, completely eliminating the risk of radial sway. At the same time, the chain drive method of sprocket a-chain belt-sprocket b is used to connect the motor C and the double-acting lead screw, realizing high torque transmission and precise reduction ratio control in a compact space. This ensures the synchronicity and stability of the lead screw rotation, and absorbs vibration through flexible transmission, significantly improving the stability and fine-tuning accuracy of the roller's axial constraint on the bar stock, while also optimizing the flexibility of the motor layout.

[0020] Preferably, a sleeve is fixed on the mounting base, a sliding shaft is slidably inserted inside the sleeve, at least two sliding sleeves are installed on the sliding shaft frame, two limiting discs are provided on both sides of each sliding sleeve, and a spring is located between the sliding sleeve and the limiting disc in the adjacent direction of the bar to be processed.

[0021] Specifically, the mounting base forms a dual guiding mechanism through the sliding fit between the sleeve and the sliding shaft, which significantly enhances the radial rigidity of the gripper and completely suppresses lateral sway. At the same time, multiple sets of telescopic arms can be manually extended and retracted. The sliding shaft frame is equipped with at least two sliding sleeves to achieve multi-support point collaborative bearing. Combined with the symmetrically arranged limiting plates on both sides of a single sliding sleeve, the stroke range is precisely constrained. Meanwhile, the spring is oriented between the sliding sleeve and the limiting plate in the adjacent bar material travel direction. After the gripper is released, it can automatically reset under the action of the spring.

[0022] It should be noted here that: Figure 1 , 2 In 3, 7, and 8, A represents the bar stock to be processed.

[0023] Compared with the prior art, the present invention provides a positioning device for a Swiss-type lathe, which has the following advantages:

[0024] It seamlessly adapts to bars of any diameter through a synchronous bidirectional opening and closing mechanism, and innovatively adopts multiple sets of radial clamping units working in a time-sharing manner. When the bar is moving, the current clamping jaw is rigidly locked by the drive cylinder, while the adjacent clamping jaw actively releases and quickly resets with the help of springs. After the bar has moved the set stroke, the reset clamping jaw immediately clamps and takes over the constraint task, while the original clamping jaw is released and reset synchronously, forming a dynamic alternating "clamping-release-reset" cycle chain. This process completely eliminates the radial rotation tendency of the bar and builds a gapless directional stable constraint in continuous conveying, which significantly improves the anti-sway capability and motion accuracy of ultra-long bar processing.

[0025] Through the synergistic effect of bidirectional lead screw and symmetrical rack-gear transmission, multiple sets of axial holding mechanisms are driven to open and close synchronously in real time with precision, completely eliminating the problem of frequent downtime for changing equipment caused by fixed clamps in traditional equipment, and realizing instantaneous adaptive clamping of bars of any diameter; the innovative design of multiple sets of radial holding mechanisms has an elastic relay mechanism - spring drives the release of the clamping jaws to quickly reset, combined with the time-sharing control of the drive cylinder to alternately lock adjacent clamping jaws, to build a dynamic constraint chain in the continuous movement of the bar, cut off the radial rotational inertia from the root, and at the same time avoid the surge in frictional resistance caused by full-process clamping. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0028] Figure 2This is a side view of the present invention.

[0029] Figure 3 This is a schematic diagram showing the positional relationship between the drive mechanism and the cabinet of this utility model;

[0030] Figure 4 This is a schematic diagram of the conveying mechanism of this utility model;

[0031] Figure 5 This is a schematic diagram of the drive mechanism structure of this utility model;

[0032] Figure 6 This is a schematic diagram of the axial retaining mechanism of this utility model;

[0033] Figure 7 This is a schematic diagram showing the positional relationship between the conveying mechanism and the axial holding mechanism of this utility model;

[0034] Figure 8 This is a schematic diagram of the radial holding mechanism of this utility model;

[0035] Figure 9 This utility model Figure 8 Enlarged diagram of part B;

[0036] Figure 10 This is a side view of the radial holding mechanism of this utility model.

[0037] In the diagram: 10, cabinet; 110, through slot; 20, conveying mechanism; 210, bearing seat; 220, rotating shaft; 230, drive wheel; 240, transmission box; 250, motor a; 30, drive mechanism; 310, moving frame; 320, slider a; 330, slide rail a; 340, motor b; 350, gear; 360, rack; 370, suspension; 40, axial retaining mechanism; 410, mounting bracket; 420, slide rail b; 430. 440. Slider b; 450. Moving part; 460. Roller; 470. Internal threaded sleeve; 471. Motor c; 471. Sprocket a; 472. Chain belt; 473. Sprocket b; 480. Double-acting lead screw; 50. Radial retaining mechanism; 510. Slide shaft bracket; 520. Slide sleeve; 530. Telescopic arm; 540. Mounting base; 541. Sleeve; 542. Slide shaft; 550. Drive cylinder; 560. Gripper; 570. Limiting plate; 580. Spring. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Example:

[0041] Please see Figures 1-10 This utility model provides a technical solution: a positioning device for a Swiss-style lathe, comprising:

[0042] Cabinet 10;

[0043] The conveying mechanism 20 is mounted on the cabinet 10 and is used to convey the bar stock to be processed along a predetermined path;

[0044] At least one set of axially retaining mechanisms 40 are arranged opposite to each other, mounted on the cabinet 10 and located on the side of the bar stock to be processed, for constraining the degree of freedom of movement of the bar stock along its axial direction; the axial retaining mechanism 40 includes a mounting frame 410a, a moving part 440, a roller 450, an internal threaded sleeve 460 and a double-acting screw 480, the double-acting screw 480 is rotatably mounted on the mounting frame 410a, the internal threaded sleeve 460 passes through the middle position of the moving part 440, the moving part 440 and the double-acting screw 480 are connected by transmission through the internal threaded sleeve 460, the roller 450 is mounted at the end of the moving part 440, and a motor c470 for driving the double-acting screw 480 to rotate is mounted on the outside of the mounting frame 410a;

[0045] The drive mechanism 30 is located inside the cabinet 10 and is used to drive at least one set of axially holding mechanisms 40 arranged opposite each other to move towards or away from each other in order to adapt to bars of different diameters to be processed.

[0046] At least one radial holding mechanism 50 is disposed on the cabinet 10, located radially outside the bar stock to be processed, and is used to constrain the degree of freedom of movement of the bar stock in a plane perpendicular to its axial direction. The radial holding mechanism 50 includes a sliding shaft frame 510, a sliding sleeve 520, a telescopic arm 530, a mounting base 540, a drive cylinder 550, a gripper 560, a limiting plate 570, and a spring 580. The sliding shaft frame 510 is fixed at the edge of the upper surface of the cabinet 10. The sliding sleeve 520 is slidably mounted on the sliding shaft frame 510. The telescopic arm 530 is inclinedly fixed at the edge of the sliding sleeve 520. The mounting base 540 is fixed at the bottom end of the telescopic arm 530. The drive cylinder 550 is mounted on the mounting base 540. The gripper 560 is drivenly connected to the drive cylinder 550. The limiting plate 570 is sleeved on the sliding shaft frame 510. A spring 580 is installed between the sliding sleeve 520 and the limiting plate 570.

[0047] Specifically, the conveying mechanism 20 efficiently conveys the bar stock to be processed along a predetermined path, while at least one set of opposing axial holding mechanisms 40 constrains the axial movement freedom of the bar stock. The mounting bracket 410, moving part 440, roller 450, internal threaded sleeve 460 and bidirectional lead screw 480 work in conjunction with the motor 470 to achieve precise adjustment. The drive mechanism 30 drives the axial holding mechanisms 40 to move in opposite directions to adapt to bars of different diameters, improving the versatility and flexibility of the equipment. The radial movement freedom of the bar stock is constrained by at least one radial holding mechanism 50. Its sliding bracket 510, sliding sleeve 520, telescopic arm 530, mounting base 540, drive cylinder 550, gripper 560, limit plate 570 and spring 580 work together to provide stable clamping and buffering, reduce processing vibration, and ensure high precision, high efficiency and high reliability of the overall processing.

[0048] Preferably, the drive mechanism 30 includes a movable frame 310, a slider a320, a slide rail a330, a motor b340, a gear 350, a rack 360, and a suspension 370. Several parallel slide rails a330 are fixedly mounted on the top of the cabinet 10. Several sliders a320 are fixedly mounted on the movable frame 310. The movable frame 310 is slidably connected to the slide rails a330 through the sliders a320. The motor b340 is vertically mounted on the top of the cabinet 10. The gear 350 is mounted on the output end of the motor b340. The rack 360 is fixedly mounted on the movable frame 310 and meshes with the gear 350. Several suspensions 370 are vertically mounted on the movable frame 310. Several through slots 110 are provided on the upper surface of the cabinet 10. The suspensions 370 are movably inserted into the through slots 110. The mounting bracket 410a is fixedly mounted on the top of the suspension 370.

[0049] Specifically, the highly stable translational motion is achieved through the cooperation of the movable frame 310, the slider a320 and the slide rail a330. The motor b340 drives the gear 350 to mesh with the rack 360 to provide precise and controllable linear driving force. The suspension 370 passes through the through slot 110 of the cabinet 10 to transmit power to the mounting frame 410a, thereby synchronously driving multiple sets of axial holding mechanisms 40 to move in opposite directions or in opposite directions, ensuring the rapid and accurate adaptation of bars of different diameters. At the same time, the overall structure has high rigidity and high transmission efficiency, which significantly improves the reliability and automation level of equipment adjustment.

[0050] Preferably, the conveying mechanism 20 includes a bearing seat 210, a rotating shaft 220, a drive wheel 230, a transmission box 240, and a motor a250. Several bearing seats 210 are equidistantly installed at the center of the upper surface of the cabinet 10. The rotating shaft 220 is rotatably inserted into the bearing seat 210. The drive wheel 230 is installed in the middle section of the rotating shaft 220. The transmission box 240 is installed on the cabinet 10 and is connected to the rotating shaft 220 in a transmission connection. The motor a250 is installed on the side wall of the cabinet 10 and is connected to the transmission box 240 in a driving connection.

[0051] Specifically, the equidistant arrangement of the bearing seats 210 provides stable support, the rotating shaft 220 and the drive wheel 230 cooperate to achieve efficient linear conveying of the bar stock, the transmission box 240 centrally drives multiple rotating shafts 220 to ensure motion synchronization, the side-mounted layout of the motor a250 optimizes space utilization, the overall structure is compact and the power transmission is reliable, which significantly improves the stability and positioning accuracy of the bar stock conveying, laying an efficient and stable foundation for subsequent processing procedures. The transmission box 240 integrates a sprocket and chain structure.

[0052] Preferably, the drive mechanism 30 has two movable frames 310, each of which is equipped with a rack 360, and both racks 360 mesh with the gear 350 simultaneously and maintain a horizontally relative distribution.

[0053] Specifically, by configuring a rack 360 on each of the two movable frames 310 and maintaining a horizontally relative distribution, the two racks 360 simultaneously mesh with the same gear 350, forming a symmetrical bidirectional drive structure. This ensures that the two movable frames 310 move in strict synchronous and opposite directions under the drive of the motor b340, completely eliminating the off-center load or asynchronous phenomenon that may occur with single-sided drive. This greatly improves the positioning accuracy and dynamic balance of the axial holding mechanism 40 moving in opposite directions, while also enhancing the rigidity and transmission stability of the overall structure, providing a more reliable and efficient adjustment mechanism for adapting to bars of different diameters.

[0054] Preferably, a vertically arranged slide rail b420 is installed on the inner wall of the mounting bracket 410a, a slider b430 is installed on one end of the moving part 440 adjacent to the slide rail b420, the slider b430 is slidably connected to the slide rail b420, a sprocket a471 is installed on the output end of the motor c470, a sprocket b473 is installed on the end of the bidirectional lead screw 480, and a chain belt 472 for transmission is installed between the sprocket a471 and the sprocket b473.

[0055] Specifically, the vertical sliding engagement of slide rail b420 and slider b430 provides high-rigidity linear guidance for moving part 440, completely eliminating the risk of radial sway. At the same time, the chain drive method of sprocket a471-chain belt 472-sprocket b473 connects motor C470 and double-acting screw 480, achieving high torque transmission and precise reduction ratio control in a compact space. This ensures the synchronicity and stability of screw 480 rotation, and absorbs vibration through flexible transmission, significantly improving the stability and fine-tuning accuracy of roller 450 for axial constraint of bar stock, while also optimizing the flexibility of motor layout.

[0056] Preferably, a sleeve 541 is fixed on the mounting base 540, a sliding shaft 542 is slidably inserted inside the sleeve 541, at least two sliding sleeves 520 are installed on the sliding shaft bracket 510, two limiting discs 570 are respectively provided on both sides of a single sliding sleeve 520, and a spring 580 is located between the sliding sleeve 520 and the limiting disc 570 in the adjacent direction of travel of the bar to be processed.

[0057] Specifically, the mounting base 540 forms a dual guiding mechanism through the sliding engagement of the sleeve 541 and the sliding shaft 542, significantly enhancing the radial rigidity of the gripper 560 and completely suppressing lateral sway. Simultaneously, multiple sets of telescopic arms 530 can be manually extended and retracted. The sliding shaft bracket 510 is equipped with at least two sliding sleeves 520 to achieve multi-point collaborative load bearing. Combined with the symmetrically arranged limiting discs 570 on both sides of each sliding sleeve 520, the stroke range is precisely constrained. Meanwhile, the spring 580 is oriented between the sliding sleeve 520 and the limiting disc 570 adjacent to the bar stock's travel direction. After the gripper 560 is released, it can automatically reset under the action of the spring 580.

[0058] Working principle: The motor A250 drives the transmission box 240 to link multiple sets of rotating shafts 220 and drive wheels 230 to realize the step-by-step continuous conveying of the bar stock. At the same time, the motor B340 drives the gear 350 to mesh with the double rack 360, which drives the two moving frames 310 to move in opposite directions. The suspension 370 drives the axial holding mechanism 40 to move. The bidirectional lead screw 480 of the axial holding mechanism 40 adjusts the roller 450 to clamp the outer diameter of the bar stock to constrain the axial degree of freedom. The radial holding mechanism 50 adopts a relay mechanism: when the current station drive cylinder 550 locks the clamp 560, the adjacent clamp 560 is released. The spring 580 pushes the sliding sleeve 520 to reset along the sliding shaft frame 510. After the bar stock has traveled the set stroke, the next station clamp 560 immediately clamps the connecting pipe radially to constrain it and releases the original clamp 560. Through alternating clamping, a moving dynamic constraint point is formed, which suppresses the radial rotation inertia throughout the process, and finally realizes high-precision continuous processing with full diameter self-adaptation and zero rotation.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A positioning device for a Swiss-style lathe, characterized in that, include: Cabinet (10); A conveying mechanism (20) is provided on the cabinet (10) for conveying the bar stock to be processed along a predetermined path; At least one set of axially retaining mechanisms (40) arranged opposite to each other are disposed on the cabinet (10) and located on the side of the bar stock to be processed, for constraining the degree of freedom of movement of the bar stock along its axial direction; the axially retaining mechanism (40) includes a mounting frame (410) a, a moving part (440), a roller (450), an internal threaded sleeve (460) and a double-acting screw (480), the double-acting screw (480) is rotatably mounted on the mounting frame (410) a, the internal threaded sleeve (460) passes through the middle position of the moving part (440), the moving part (440) and the double-acting screw (480) are connected by transmission through the internal threaded sleeve (460), the end of the moving part (440) is equipped with a roller (450), and a motor c (470) for driving the double-acting screw (480) to rotate is installed on the outside of the mounting frame (410) a. A drive mechanism (30) is disposed inside the cabinet (10) and is used to drive at least one set of axial holding mechanisms (40) arranged opposite each other to move towards or away from each other in order to adapt to bars of different diameters to be processed. At least one radial holding mechanism (50) is disposed on the cabinet (10) and located radially outside the bar stock to be processed, for constraining the degree of freedom of movement of the bar stock in a plane perpendicular to its axial direction; the radial holding mechanism (50) includes a sliding bracket (510), a sliding sleeve (520), a telescopic arm (530), a mounting base (540), a drive cylinder (550), a gripper (560), a limiting plate (570), and a spring (580), the sliding bracket (510) being fixed to the edge of the upper surface of the cabinet (10). The sliding sleeve (520) is slidably mounted on the sliding shaft frame (510), the telescopic arm (530) is inclined and fixed on the edge of the sliding sleeve (520), the mounting seat (540) is fixed on the bottom end of the telescopic arm (530), the drive cylinder (550) is mounted on the mounting seat (540), the gripper (560) is driven and connected to the drive cylinder (550), the limiting plate (570) is sleeved on the sliding shaft frame (510), and a spring (580) is installed between the sliding sleeve (520) and the limiting plate (570).

2. The positioning device for a Swiss-style lathe according to claim 1, characterized in that: The drive mechanism (30) includes a movable frame (310), slider a (320), slide rail a (330), motor b (340), gear (350), rack (360), and suspension (370). Several parallel slide rails a (330) are fixed to the top of the cabinet (10), and several sliders a (320) are fixed to the movable frame (310). The movable frame (310) is slidably connected to the slide rails a (330) through the sliders a (320). The motor b (340) is installed vertically. Inside the cabinet (10), at the top, the gear (350) is installed at the output end of the motor b (340), the rack (360) is fixed on the movable frame (310), and the rack (360) meshes with the gear (350). Several suspensions (370) are vertically installed on the movable frame (310). Several through slots (110) are opened on the upper surface of the cabinet (10), and the suspensions (370) are movably inserted in the through slots (110). The mounting bracket (410) a is fixed on the top of the suspension (370).

3. The positioning device for a Swiss-style lathe according to claim 1, characterized in that: The conveying mechanism (20) includes a bearing seat (210), a rotating shaft (220), a drive wheel (230), a transmission box (240), and a motor a (250). Several bearing seats (210) are equidistantly installed at the center of the upper surface of the cabinet (10). The rotating shaft (220) is rotatably installed inside the bearing seat (210). The drive wheel (230) is installed in the middle section of the rotating shaft (220). The transmission box (240) is installed on the cabinet (10). The rotating shaft (220) is connected to the transmission box (240) in a driving connection. The motor a (250) is installed on the side wall of the cabinet (10). The transmission box (240) is connected to the motor a (250) in a driving connection.

4. A positioning device for a Swiss-style lathe according to claim 2, characterized in that: The drive mechanism (30) has two movable frames (310), each of which is equipped with a rack (360), and both racks (360) mesh with the gear (350) at the same time and are horizontally distributed.

5. A positioning device for a Swiss-style lathe according to claim 1, characterized in that: The inner wall of the mounting bracket (410) a is equipped with a vertically arranged slide rail b (420). The movable part (440) is equipped with a slider b (430) at one end adjacent to the slide rail b (420). The slider b (430) is slidably connected to the slide rail b (420). The output end of the motor c (470) is equipped with a sprocket a (471). The end of the bidirectional lead screw (480) is equipped with a sprocket b (473). A chain belt (472) for transmission is installed between the sprocket a (471) and the sprocket b (473).

6. A positioning device for a Swiss-style lathe according to claim 1, characterized in that: A sleeve (541) is fixed on the mounting base (540), and a sliding shaft (542) is slidably passed through the sleeve (541). At least two sliding sleeves (520) are installed on the sliding shaft frame (510). Two limiting discs (570) are respectively provided on both sides of each sliding sleeve (520). The spring (580) is located between the sliding sleeve (520) and the limiting disc (570) in the adjacent direction of the bar stock to be processed.

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