A turning-milling combined numerical control lathe

Abstract

The present application relates to the technical field of lathe machining, and discloses a turning-drilling-milling combined numerical control lathe, which comprises a lathe body, a turning mechanism and a drilling-milling combined mechanism arranged in the lathe body, a chuck is arranged on the output end of the main shaft mechanism in the lathe body, and the drilling-milling combined mechanism is arranged in the lathe body through a displacement adjusting module. The present application is characterized in that the drill and the milling cutter are symmetrically arranged in the clamping main body center, the rotary centers of the two cutters coincide with the reference point of the clamping main body center, the numerical control system can complete the unified coordinate calibration and cutter compensation setting of the two cutters relying on the same center origin, the special cutter telescopic adjusting assembly is arranged, the double-cutter synchronous telescopic and single-cutter independent fine adjustment two adjusting modes are supported, the drill and the milling cutter head extension position can be accurately corrected, the reference drift caused by the inconsistent cutter extension amount is avoided, the cutter head is always kept in the numerical control system preset reference position, and the system accurate trajectory control is facilitated.

Description

Technical Field

[0001] This invention relates to the field of lathe machining technology, and specifically to a combined turning, drilling, and milling CNC lathe. Background Technology

[0002] Cylindrical components are widely used in transmission mechanisms, hydraulic pipes, and mechanical shafts. Currently, they are often machined using CNC lathes with a turning-drilling-milling mechanism. During the machining process, the turning operation can form the rotating base structure of the workpiece, and subsequent drilling and milling operations are required to process irregular structures such as holes, keyways, and flat parts.

[0003] Currently, most drilling and milling mechanisms on the market adopt a split structure, with the drill bit and milling cutter assembled independently. When switching processes, manual disassembly and replacement of tools is required, which is not only cumbersome and time-consuming, resulting in poor machining continuity, but also easily leads to positioning deviations due to secondary clamping, reducing workpiece machining accuracy. Some integrated tool holders can only achieve fixed-position operation, making it difficult to unify the reference coordinates of the two tools. The CNC system cannot accurately determine the tool reference position, leading to significant accumulation of dimensional errors during machining.

[0004] Meanwhile, during the tool assembly stage, the tool extension length is prone to deviation due to assembly processes and component tolerances, causing the reference point to shift and directly resulting in dimensional errors such as hole depth and milling contour. Conventional tool arrangement methods result in uneven force distribution, making the mechanism prone to vibration and shaking during cutting operations, further affecting the compliance rate of geometric tolerances. Furthermore, the existing structure lacks an adaptive tool position adjustment mechanism, failing to effectively compensate for installation errors and making it difficult to meet the production requirements of high-precision, high-efficiency integrated drilling and milling machining of cylindrical workpieces.

[0005] Therefore, designing a drilling and milling integrated clamping mechanism with symmetrical tool arrangement, automatic tool switching, and telescopic adjustment function, to unify tool reference position, compensate for assembly length error, and improve process switching efficiency and machining stability, has become a necessary direction to solve the defects of existing technology. Summary of the Invention

[0006] To address the aforementioned shortcomings of existing technologies, this invention provides a combined turning-drilling-milling CNC lathe. Through symmetrical double-tool switching, retractable adjustment, and a rotary centrifugal self-locking reinforcement structure, it achieves unified tool reference, automatic error compensation, and high rigidity and stability in the machining state. This significantly improves the drilling and milling accuracy and automation level of cylindrical workpieces. It effectively solves the problems of existing combined turning-drilling-milling lathes, such as the inability to automatically switch drilling and milling tools, lack of unified reference accuracy, inability to compensate for tool installation extension and retraction errors, and easy loosening and shaking during the cutting process, resulting in low machining accuracy.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a CNC lathe with a turning-drilling-milling composite structure, including a lathe body and a turning mechanism and a drilling-milling composite mechanism disposed inside the lathe body. A chuck is installed at the output end of the spindle mechanism inside the lathe body. The drilling-milling composite mechanism is installed in the lathe body through a displacement adjustment module. The drilling-milling composite mechanism includes a clamping body, a drill bit, a milling cutter, a shifting motor, and a tool extension and retraction adjustment assembly. The drill bit and the milling cutter are symmetrically arranged around the center position of the clamping body, and the drill bit and the milling cutter are driven to rotate by a rotating assembly. The shifting motor is used to drive the drill bit and milling cutter to reciprocate and shift relative to the clamping body, thereby realizing the automatic switching between drilling and milling modes. The tool extension adjustment components are respectively assembled at the connection positions of the drill bit, the milling cutter and the clamping body. The tool extension adjustment components are used to individually adjust the extension length of the drill bit and the milling cutter, thereby calibrating the reference position of the two tool tips and eliminating tool assembly length errors.

[0008] Furthermore, the clamping body is cylindrical in shape and is rotatably connected to the main support of the drilling and milling compound mechanism via two rotating shafts. The shifting motor is fixed to the main support of the drilling and milling compound mechanism, and its output shaft is fixedly connected to one of the rotating shafts. The shifting motor drives the clamping body to move the drill bit and the milling cutter to reciprocate and switch at a fixed angle. Each switch only makes one of the tools align with the columnar workpiece to be processed to complete the cutting operation, while the other tool is in an idle and avoidance state. The main support is equipped with at least one fixing module for securing the rotated shaft, so that the drill bit and milling cutter are in a stable state after conversion; at least one shaft is hollow and is used to clamp the wiring inside the main body. The drill bit and the milling cutter are respectively movably inserted into symmetrical positions on both sides of the clamping body through the positioning and locking parts of the tool extension and retraction adjustment assembly. The rotation center of the two tools coincides with the center reference point of the clamping body. The CNC system completes the position calibration of the two tools with the center of the clamping body as a unified coordinate reference.

[0009] Furthermore, the positioning locking component includes a locking sleeve mounted on the end of the clamping body via a rotating bearing, one end of which extends into the interior of the clamping body and is connected to the adjusting end of the tool telescopic adjustment assembly; The bottom of the locking sleeve is provided with a mounting groove for inserting the tool mounting part. The tool is fixed by the expansion of the inner surface of the mounting groove.

[0010] Furthermore, the locking sleeve has a storage cavity Y1 and a pressure cavity Y2 inside, and an inlet Y3 is provided between the storage cavity Y1 and the pressure cavity Y2 for the oil stored in the storage cavity Y1 to enter the pressure cavity Y2. The inlet Y3 is flared to increase the oil pressure in the pressure cavity Y2. The storage cavity Y1, the pressure cavity Y2 and the inlet Y3 are all annular and coincide with the axis of the mounting groove. The inner surfaces of the pressure chamber Y2 and the mounting slot are metal expansion layers, which are used to expand the metal expansion layer toward the center of the mounting slot by increasing the hydraulic pressure in the pressure chamber Y2, thereby fixing the prop. The outer surface of the locking sleeve is provided with an injection through hole that communicates with the inside of the storage cavity Y3. A bolt rod is threadedly connected inside the injection through hole, and a sealing element is provided at one end of the bolt rod. This is used to regulate the oil pressure inside the storage cavity Y1 by moving the bolt rod inside the injection through hole.

[0011] Furthermore, the outer ring of the rotating bearing is fixed to the end of the clamping body, and the inner ring is provided with several strip-shaped guide grooves. The outer surface of the locking sleeve is fixed with several strip-shaped guide parts for sliding inside the strip-shaped guide grooves, so that the locking sleeve can rotate through the rotating bearing and can be extended and retracted by the tool extension and retraction adjustment assembly.

[0012] Furthermore, the interior of the strip guide is provided with a centrifugal groove, and a centrifugal block is movably disposed in the centrifugal groove. Both ends of the centrifugal block are trapezoidal protrusions. The inner wall of the centrifugal groove and the inner surface of the strip guide groove are both set as recessed areas A that match the ends of the centrifugal block. This is used to rotate the locking sleeve to make the two ends of the centrifugal block move radially into the two recessed areas A through centrifugal force. This forms a friction lock between the strip guide groove and the strip guide during drilling or milling operations, which is used to improve the accuracy during drilling or milling. The recessed area A of the strip guide groove and the trapezoidal protrusion at one end of the centrifugal block are designed to be mutually matching concave and convex surfaces, which are used to indirectly increase the stability of the strip guide part inside the strip guide groove. The bottom of the centrifugal block is provided with several cylindrical guide grooves. The bottom of the centrifugal groove is fixed with several positioning parts for insertion into the cylindrical guide grooves. The outer surface of the positioning part is provided with an elastic damping sleeve. The inner surface of the cylindrical guide groove is provided with two limiting ring grooves for positioning the elastic damping sleeves, which are used to position the centrifugal block in the front and back states during centrifugal movement. The positioning part has a gap channel J inside that connects the cylindrical guide groove and the mounting through groove. This gap channel J is used to release the pressure inside the cylindrical guide groove when the positioning part moves in and out of the cylindrical guide groove. The diameter of the gap channel J is ≤1 mm.

[0013] Furthermore, the tool telescopic adjustment assembly includes at least two guide posts, two guide seats, and a drive for displacing one or both guide seats along the axial direction of the guide posts. The two guide pillars are symmetrical, with their ends fixed inside the clamping body. The two guide seats are symmetrically slidably connected between the two guide pillars. The ends of the two guide seats are fixed with rotating sleeves, and the two rotating sleeves are rotatably connected to the outer surface of the locking sleeve. When the driving component moves one or both guide seats along the axial direction of the guide pillar, the locking sleeve is used to adjust the extension and retraction of the drill bit or milling cutter. At least two electromagnetic locking devices are installed on the two guide seats to lock the guide posts, which are used to electromagnetically lock the guide seats with axial displacement, thereby increasing the stability and connection strength of the drill bit or milling cutter during operation and after feeding.

[0014] Furthermore, the driving component includes a drive motor capable of forward and reverse driving, a connecting frame, and two hinged frames; The drive motor is fixed to the outer surface of the clamping body, and the output shaft extends into the interior of the clamping body and is fixed to the center of the connecting frame. The two hinge frames are respectively hinged to both ends of the connecting frame, and the other end is respectively hinged to the two guide seats. The two hinge frames are inclined so that when the connecting frame is rotated and adjusted by the drive motor, the two hinge frames move in a fan shape, forming the axial displacement of the two guide seats. The hinge frame consists of a telescopic sleeve and a telescopic block. The telescopic block is located inside the telescopic sleeve and moves in a telescopic motion. The telescopic sleeve is provided with a friction block that elastically abuts against the telescopic block. The abutting force between the friction block and the telescopic block is greater than the driving force of the driving component on the two guide seats.

[0015] Furthermore, the drive unit includes three drive modes: Mode 1: When it is necessary to make axial displacement of the two positioning locking parts to form synchronous extension and retraction adjustment of the drill bit and the milling cutter, the connecting frame is rotated by the drive motor, so that the two guide seats of the two hinge frames are displaced relative to each other or away from each other, thus forming synchronous adjustment of the drill bit and the milling cutter. Mode 2: When one of the positioning locking components needs to be axially displaced to adjust the extension and retraction of the drill bit or milling cutter, all the electromagnetic locking components on the guide seat connected to the positioning locking component are disabled, and all the electromagnetic locking components on the other guide seat are simultaneously activated. When the two guide seats are indirectly driven to move axially through the drive motor, one of the guide seats is locked and cannot move, thus enabling the individual adjustment of the drill bit or milling cutter. Mode 3: When it is necessary to symmetrically calibrate the positions of the two positioning locking parts, the two guide seats are moved in opposite directions by the drive motor. When the two guide seats move to their limit positions in opposite directions, the continuous movement of the drive motor can cause the telescopic block in the fully retracted or fully extended hinge frame to telescopically displace. When the inner end of the telescopic block in the hinge frame moves to the middle position of the telescopic sleeve, the reset adjustment can be completed. The outer surface of the locking sleeve is equipped with scale marks or displacement sensors to monitor the telescopic adjustment position of the locking sleeve in real time.

[0016] Furthermore, the rotating assembly includes a rotating motor capable of rotating in both directions and a rotating shaft. Both ends of the rotating shaft are connected to telescopic columns P1 via one-way bearings, and the locking sleeve has a telescopic groove P2 inside for the telescopic column P1 to be inserted and slide telescopically. The cross sections of the telescopic column P1 and the telescopic groove P2 are mutually matching irregular surfaces. The two one-way bearings are locked in opposite directions, and the outer ring of the bearing is fixed to the rotating shaft, while the inner ring is fixed to the telescopic column P1. When the rotating shaft is driven to rotate clockwise or counterclockwise by a rotary motor, only one one-way bearing can drive one telescopic column P1 to rotate, while the other one-way bearing is in an idle state. The rotating shaft is rotatably connected to the inside of the clamping body via a rotating frame, and the rotation center coincides with the center reference point of the clamping body. The rotating motor is connected to the rotating shaft via a transmission assembly.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art: The centrally symmetrical dual-tool arrangement unifies the reference coordinates and improves the calibration accuracy of CNC machining: By symmetrically arranging the drill bit and milling cutter around the center of the clamping body, the rotation center of the two tools coincides with the reference point of the center of the clamping body. The CNC system can complete the unified coordinate calibration and tool compensation setting of the two tools based on the same central origin, avoiding the conversion error caused by the misalignment of the reference of traditional split tools, and ensuring the coaxiality, positional accuracy and dimensional consistency of the holes and slots of columnar workpieces from the source.

[0018] It features a dual-tool synchronous extension and retraction adjustment function plus a single-tool independent extension and retraction adjustment function to compensate for installation length errors: By setting a dedicated tool extension and retraction adjustment component, it supports two adjustment modes: dual-tool synchronous extension and retraction and single-tool independent fine adjustment. It can accurately correct the extension position of drill and milling cutter heads, effectively offsetting the length deviation caused by tool assembly tolerance, disassembly and assembly clearance, and normal wear, avoiding reference drift caused by inconsistent tool extension, and ensuring that the tool head is always in the preset reference position of the CNC system, which is conducive to the precise trajectory control of the system.

[0019] The system features a multi-mode self-calibration structure for the reference, which can automatically reset the reference after long-term use. By configuring three drive adjustment modes, it not only meets the requirements of conventional telescopic adjustment, but also enables automatic centering calibration after the dual-tool limit. The system utilizes the telescopic adaptive characteristics of the articulated frame to reset the reference of both tools, solving the problem of dual-tool reference offset caused by long-term machining and vibration wear, and maintaining a high-precision machining state for a long time.

[0020] The hydraulic expansion locking structure achieves uniform and gapless clamping of the tool: By adopting a hydraulic locking sleeve structure with a built-in storage chamber, pressure chamber and flared inlet, the metal expansion layer is driven to deform radially through oil pressure regulation, and the tool holder is uniformly clamped in the circumference. It has high clamping rigidity, good concentricity and no clamping off-center load, and can be adapted to complex load conditions such as high torque drilling and intermittent cutting in milling, reducing tool clamping wobbling.

[0021] The centrifugal mechanical self-locking structure provides stronger locking stability at higher speeds, significantly improving machining accuracy. By setting a centrifugal block concave-convex locking mechanism between the strip guide and the guide groove, the centrifugal block is embedded in the concave area by centrifugal force when the tool rotates at high speed, automatically eliminating guide clearance and achieving circumferential rigid locking. Moreover, the higher the cutting speed, the greater the centrifugal locking force, which can effectively suppress radial sway, vibration and micro-movement during drilling and milling, solve the problem of insufficient stability under high-speed conditions after telescopic adjustment, and further ensure dimensional and positional tolerances and surface finish quality. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is an external structural view of the CNC lathe with turning, drilling, and milling functions of the present invention; Figure 2 This is an internal schematic diagram of the CNC lathe with turning, drilling, and milling functions of the present invention; Figure 3 This is a schematic diagram of the combination of the displacement adjustment module and the drilling and milling composite mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the clamping body of the present invention; Figure 5 This is a cross-sectional view of the clamping body of the present invention; Figure 6 This is a schematic diagram of the positioning and locking component of the present invention; Figure 7 This is a cross-sectional view of the positioning and locking component of the present invention; Figure 8This is a schematic diagram of the radial cross-section of the positioning and locking component of the present invention; Figure 9 This is a structural breakdown diagram of the rotating shaft of the present invention; Figure 10 This is a partial schematic diagram of the tool telescopic adjustment assembly of the present invention; Figure 11 This is a cross-sectional schematic diagram of the hinge frame of the present invention.

[0024] The labels in the diagram represent: 10. Lathe body; 20. Turning mechanism; 30. Displacement adjustment module; 40. Drilling and milling compound mechanism; 41. Clamping body; 42. Drill cutter; 43. Milling cutter; 44. Positioning motor; 45. Tool telescopic adjustment assembly; 451. Guide post; 452. Guide seat; 453. Electromagnetic locking element; 454. Drive motor; 455. Connecting frame; 456. Hinge frame; 457. Friction block; 46. ​​Positioning and locking component; 461. Rotating bearing; 462. Locking sleeve; 463. Bolt rod; 464. Strip guide groove; 465. Strip guide section; 466. Centrifuge tank; 467. Centrifuge block; 50. Rotating assembly; 51. Rotating motor; 52. Rotating shaft; 53. One-way bearing; 54. Transmission assembly. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] The present invention will be further described below with reference to embodiments.

[0027] Example 1: Please see Figures 1 to 11 This invention provides a technical solution: a turning-drilling-milling composite CNC lathe, including a lathe body 10 and a turning mechanism 20 and a drilling-milling composite mechanism 40 disposed inside the lathe body 10. The output end of the spindle mechanism inside the lathe body 10 is fixedly installed with a three-jaw / four-jaw chuck for clamping cylindrical workpieces. The chuck rotates with the spindle, which can complete the clamping, positioning and rotary feed of shaft-type and sleeve-type cylindrical blank workpieces. The turning mechanism 20 and the drilling-milling composite mechanism 40 together constitute the core machining execution unit of the whole machine, and work together to complete the integrated composite machining of turning, drilling and milling of cylindrical workpieces.

[0028] The drilling and milling composite mechanism 40 is mounted on the internal frame of the lathe body 10 via a multi-degree-of-freedom displacement adjustment module 30. The displacement adjustment module 30 has X, Y, and Z three-axis linear servo feed functions, which can drive the drilling and milling composite mechanism 40 to achieve precise horizontal, longitudinal, and vertical displacement adjustment, thereby adapting to the point-to-point machining requirements of different holes, slots, and planes on the end face and radial sidewall of columnar workpieces.

[0029] The processing logic of this equipment adopts a composite processing mode in which the workpiece is stationary and the cutting tool rotates for cutting: when drilling and milling operations are performed, the lathe spindle is mechanically locked through the hydraulic locking unit, so that the cylindrical workpiece held by the chuck remains absolutely stationary without rotation or slight movement; only the drill bit 42 or the milling cutter 43 in the drilling and milling composite mechanism 40 rotates at high speed, and the servo feed cutting is completed in conjunction with the displacement adjustment module 30, avoiding the reference offset error caused by traditional secondary clamping.

[0030] The turning mechanism 20 and the drilling and milling compound mechanism 40 adopt a spatially independent staggered arrangement structure. When the turning mechanism 20 performs turning and forming operations on the cylindrical workpiece such as outer circle, end face, conical surface, and thread, the drilling and milling compound mechanism 40 retracts to the avoidance position along the displacement adjustment module 30. Through the dual protection of program logic and mechanical limit, the motion trajectories of the two mechanisms do not interfere with each other and the action sequence does not interfere with each other, so as to realize the continuous processing of the whole process in one clamping at a single station. The drilling and milling compound mechanism 40 specifically includes a cylindrical clamping body 41, a drill bit 42, a milling cutter 43, a shifting motor 44, and a tool extension and retraction adjustment assembly 45; wherein the drill bit 42 and the milling cutter 43 are arranged in a centrally symmetrical manner with the geometric center of the clamping body 41 as the reference, ensuring that the initial reference coordinates of the two tools are coaxial and equidistant; both the drill bit 42 and the milling cutter 43 are provided with independent rotational power through the built-in rotating assembly 50, providing speed and torque input for drilling and milling cutting motions; The shifting motor 44 serves as the power source for switching between the two cutting tools. It can drive the drill bit 42 and the milling cutter 43 to reciprocate at a fixed angle relative to the clamping body 41, thereby achieving automated and precise switching between the drilling and milling stations. This eliminates the need for manual disassembly and tool replacement, as well as tool resetting, significantly reducing the auxiliary time for process switching. The tool extension adjustment component 45 is matched and assembled in the connection assembly area between the drill bit 42, the milling cutter 43 and the clamping body 41. It has the functions of independent extension adjustment for a single tool and synchronous extension adjustment for both tools. It can accurately calibrate the axial reference position of the tool head of the two tools, effectively compensate for the extension length error caused by tool assembly tolerance, tool wear and clamping clearance, unify the CNC coordinate reference of the two tools, and improve the machining accuracy of hole depth, groove depth and contour dimensions of columnar workpiece from the structural source.

[0031] See attached document Figures 3 to 5The clamping body 41 adopts a hollow cylindrical integrated casting structure, which has the advantages of high structural rigidity, easy wiring and component integration in the internal cavity, and easy deformation under stress. The clamping body 41 is symmetrically fixed with a rotary shaft at both ends, which is supported on the fixed main body bracket of the drilling and milling composite mechanism 40 through the rotation of the shaft, forming a rotary support pair that can swing at a certain angle, ensuring the concentricity of rotation and the stability of movement of the clamping body 41 during the displacement process.

[0032] The shifting motor 44 adopts a servo geared motor structure and is fixedly installed on the outer wall of the main support of the drilling and milling compound mechanism 40. Its output shaft is rigidly connected to one of the rotating shafts through a coupling. Utilizing the angle closed-loop control characteristics of the servo motor, it precisely drives the rotating shaft to drive the clamping body 41 to perform a pre-set angle reciprocating swing displacement. After the station switching is completed, a single action only makes one of the tools accurately align with the machining axis of the cylindrical workpiece to be processed and enter the effective cutting station. The other tool swings with the clamping body 41 to the side idle avoidance station to avoid motion interference and collision damage between the tool and the workpiece and chuck.

[0033] At least one set of mechanical fixing and locking modules is installed on the main support corresponding to the rotation position of the shaft. After the work station is switched to the position, the fixing module uses hydraulic / electromagnetic clamping to perform circumferential and axial double locking constraints on the shaft, eliminating the mating clearance and swing clearance of the rotating pair, so that the drill bit 42 and the milling cutter 43 after displacement maintain a high rigidity and stability, and suppress cutting vibration and micro-angle deviation.

[0034] At least one of the rotating shafts adopts a hollow through-hole shaft structure. The hollow cavity serves as a channel for the power supply cables and signal cables of the internal sensors and electromagnetic components of the clamping body 41, realizing the concealed layout of the built-in electrical circuits. This not only avoids the aging of the cables due to swinging and pulling, but also simplifies the external wiring layout of the whole machine and improves the protection and cleanliness of the equipment.

[0035] Drill cutter 42 and milling cutter 43 are detachably and axially extendable and inserted into symmetrical mounting positions on both sides of clamping body 41 via positioning locking parts 46 matched with tool extension adjustment assembly 45. The rotation center lines of the two tools are strictly coincident with the center reference point of clamping body 41, constructing a unified mechanical reference origin. The CNC system uses the center of clamping body 41 as the global coordinate reference, and synchronously completes the coordinate calibration, tool compensation assignment and trajectory programming of drill cutter 42 and milling cutter 43, eliminating coordinate conversion errors caused by misalignment of the two tools and ensuring the consistency of batch processing dimensions.

[0036] See attached document Figures 6 to 8The positioning and locking component 46 is the core integrated component that realizes the tool rotation support, axial extension guidance and tool clamping and locking. It mainly includes a rotating bearing 461 and a locking sleeve 462. The rotating bearing 461 adopts a precision angular contact combined bearing, and its outer ring is interference-fixed in the mounting hole at the end of the clamping body 41 to achieve no relative displacement of the bearing outer ring, providing high-precision rotation support and axial limit for the locking sleeve 462.

[0037] The locking sleeve 462 is coaxially mounted on the inner side of the inner ring of the rotating bearing 461. One axial end of the locking sleeve 462 extends into the internal cavity of the clamping body 41 and is rigidly connected to the axial adjustment end of the tool telescopic adjustment assembly 45. The tool telescopic adjustment assembly 45 drives the locking sleeve 462 to make precise linear feed and position locking along the axis.

[0038] The locking sleeve 462 has a through-type mounting groove along its axial direction. The mounting groove adopts a composite structure of conical surface and straight groove, which is used for precise insertion and positioning of the tool holder column and circumferential limit. The locking sleeve 462 has a built-in hydraulic expansion locking structure. By adjusting the internal oil pressure, the radial deformation of the inner wall of the mounting groove is changed. The elastic expansion of the metal is used to achieve a gapless clamping and fixing of the tool holder. It has good clamping uniformity and high coaxiality, and can be adapted to the clamping requirements of standard tools with different shank diameters. At the same time, it has vibration reduction and anti-vibration effects.

[0039] See attached document Figure 7 The locking sleeve 462 is coaxially divided into an annular storage chamber Y1 and an annular pressure chamber Y2. The storage chamber Y1 is used to store hydraulic transmission oil, and the pressure chamber Y2 serves as a pressure storage and deformation execution chamber. Several flared inlets Y3 are evenly distributed in an annular shape between the storage chamber Y1 and the pressure chamber Y2. The flared structure utilizes the principle of fluid throttling and pressurization, so that the oil in the storage chamber Y1 generates a pressure amplification effect after flowing through the inlets Y3, which significantly improves the oil pressure level inside the pressure chamber Y2.

[0040] Storage chamber Y1, pressure chamber Y2 and liquid inlet Y3 all adopt a coaxial annular symmetrical layout, which is consistent with the central axis of the installation channel to ensure uniform circumferential pressure distribution and avoid unilateral load causing tool clamping eccentricity and excessive rotational runout.

[0041] Both the outer wall of the pressure chamber Y2 and the inner wall of the mounting slot are made of a high-elasticity alloy metal expansion layer, which has the characteristics of high strength, high elastic deformation, and good recovery after deformation. When the oil pressure inside the pressure chamber Y2 increases, the hydraulic force drives the metal expansion layer to radially contract and deform towards the center of the mounting slot, gripping the tool holder inserted into the slot to achieve gapless and high-rigidity clamping and fixing. After depressurization, the expansion layer elastically recovers, which can quickly realize the disassembly and replacement of the tool.

[0042] The outer surface of the locking sleeve 462 has a radially opened injection through hole that communicates with the inside of the storage cavity Y1, serving as a channel for oil injection and pressure regulation. The inner wall of the injection through hole is machined with internal threads, and a bolt rod 463 is connected to the threaded seal. The end of the bolt rod 463 integrates a rubber sealing gasket to achieve high-pressure sealing at the threaded connection. By rotating the screw rod 463 into the injection through hole, the sealed volume inside the storage cavity Y1 can be changed, the oil pressure inside the cavity can be precisely controlled, and the clamping force of the metal expansion layer can be steplessly adjusted to adapt to the tool locking requirements under different cutting loads.

[0043] See attached document Figures 6 to 8 The outer ring of the rotating bearing 461 is interference-fitted to the mounting hole at the end of the clamping body 41 to form a static fit. Multiple axial strip guide grooves 464 are equidistantly opened on the inner circular surface of the bearing inner ring along the circumference. The strip guide grooves 464 adopt a high-precision rectangular straight groove structure, which has the characteristics of high guiding accuracy, low sliding resistance and long wear life.

[0044] The outer circular surface of the locking sleeve 462 corresponds to the number and position of the strip guide grooves 464, and several axial strip guide parts 465 are fixedly set. The strip guide parts 465 and the strip guide grooves 464 adopt a small clearance sliding fit structure. This fit structure gives the locking sleeve 462 two degrees of freedom of movement: first, the locking sleeve 462 can rotate at high speed with the inner ring of the rotating bearing 461 to meet the cutting rotation conditions of the drill bit 42 and the milling cutter 43; second, the strip guide parts 465 can slide axially linearly along the strip guide grooves 464, and cooperate with the tool extension adjustment component 45 to realize the axial extension position adjustment of the locking sleeve 462 and the tool, while transmitting torque circumferentially to prevent the locking sleeve 462 from slipping circumferentially relative to the inner ring of the bearing.

[0045] See attached document Figure 8 The inside of the strip guide section 465 is opened in a closed centrifugal groove 466 along the radial direction. The centrifugal block 467 that can slide along the radial direction is movably embedded inside the centrifugal groove 466. The two ends of the centrifugal block 467 are processed into trapezoidal protrusions. The inner wall of the centrifugal groove 466 and the groove wall of the strip guide groove 464 are processed with recessed areas A that precisely match the contour of the trapezoidal protrusions, forming a concave-convex interlocking fit structure.

[0046] When the locking sleeve 462 drives the tool to rotate at high speed for drilling or milling operations, the centrifugal block 467 slides radially outward along the centrifugal groove 466 under the action of centrifugal force, so that the trapezoidal protrusions at both ends are simultaneously embedded into the corresponding recessed area A, thereby realizing the circumferential mechanical locking of the strip guide groove 464 and the strip guide part 465, eliminating the guide fit clearance, suppressing the micro-oscillation and micro-movement of the locking sleeve 462 during the cutting process, and greatly improving the tool rotation rigidity and positioning accuracy.

[0047] The recessed area A of the strip guide groove 464 and the trapezoidal protrusion at the end of the centrifugal block 467 are set as high-precision meshing concave-convex surfaces, which increases the contact area and friction locking force, further enhances the circumferential stability of the strip guide part 465 inside the strip guide groove 464, and weakens the vibration disturbances generated by intermittent milling and deep hole drilling.

[0048] Several cylindrical guide grooves are axially opened at the bottom of the centrifugal block 467. A corresponding number of positioning parts are vertically fixed at the bottom of the centrifugal groove 466. The positioning parts can be slidably inserted into the cylindrical guide grooves to achieve precise guidance and anti-skewing of the radial sliding of the centrifugal block 467. An elastic damping sleeve is fitted on the outer surface of the positioning part. Two limiting ring grooves are opened at the upper and lower positions of the inner wall of the cylindrical guide groove. The elastic damping sleeve can be embedded in the limiting ring grooves to form upper and lower work position positioning, which correspond to the low-speed standby unlocked state and the high-speed cutting locked state of the tool, respectively, to achieve the limiting of the sliding stroke of the centrifugal block 467 and the maintenance of the work position stability.

[0049] A gap channel J with a small aperture ≤ 1mm is opened axially inside the positioning part to connect the inner cavity of the cylindrical guide groove with the inner cavity of the mounting groove of the locking sleeve 462. When the positioning part slides and extends relative to the cylindrical guide groove, the gap channel J is used to realize the adaptive pressure relief balance of the air pressure in the groove, so as to avoid the air pressure in the sealed cavity from hindering the movement of the centrifugal block 467, and to ensure that the centrifugal block 467 slides sensitively and the locking action responds promptly.

[0050] See attached document Figure 4 , Figure 5 , Figure 10 and Figure 11 The tool telescopic adjustment assembly 45 is a precision transmission mechanism for realizing synchronous / independent axial adjustment and position locking of the two tools. It mainly includes two symmetrically arranged guide columns 451, two symmetrically slidably arranged guide seats 452, and a driving component. The two guide columns 451 are parallel and symmetrically fixed at both ends of the internal cavity of the clamping body 41. They are made of high-strength tempered round steel and have the characteristics of high straightness and small wear resistance and deformation, providing a high-precision linear sliding reference for the guide seats 452.

[0051] Two guide seats 452 are symmetrically slidably mounted between two guide posts 451, forming a double guide support sliding pair to ensure that the axial displacement of the guide seats 452 is stable and without wobble; a rotating sleeve is fixedly mounted on the outer end of each guide seat 452, and the rotating sleeve is rotated and sleeved on the outer circular surface of the locking sleeve 462 through a precision bearing, which neither restricts the high-speed rotational movement of the locking sleeve 462, but also allows the locking sleeve 462 to be driven by the guide seat 452 to make axial synchronous displacement.

[0052] The driving component, as a power input unit, can drive one or two guide seats 452 to slide axially along the guide post 451, and then drive the locking sleeve 462 through the rotating sleeve to complete the axial extension and retraction control of the drill bit 42 and the milling cutter 43.

[0053] At least two sets of electromagnetic locking components 453 are symmetrically installed on each guide seat 452. After the electromagnetic locking components 453 are energized, they hold the outer wall of the guide column 451 by electromagnetic attraction, realizing instantaneous rigid locking after the guide seat 452 slides into place, eliminating guide pair gap and force displacement, greatly improving the structural stability and overall rigidity of the drill bit 42 and the milling cutter 43 during the feed cutting process, and resisting cutting impact load and vibration deformation.

[0054] See attached document Figure 4 , Figure 5 , Figure 10 and Figure 11 The drive unit adopts a motor-connecting rod hinge composite transmission structure, including a drive motor 454 that can be precisely adjusted in both forward and reverse directions, a connecting frame 455, and two sets of symmetrically arranged hinge frames 456. The drive motor 454 is sealed and fixed to the outer wall of the clamping body 41, and the output shaft extends into the internal cavity of the clamping body 41 and is rigidly connected to the geometric center of the connecting frame 455 to achieve precise input of torque and angle.

[0055] The upper ends of the two sets of hinge frames 456 are respectively hinged to the two ends of the connecting frame 455, and the lower ends are respectively hinged to the two guide seats 452, and the whole is arranged in a symmetrical and inclined manner. When the drive motor 454 drives the connecting frame 455 to rotate in a fixed angle in both directions, the hinge frame 456 moves in a fan-shaped cycloidal motion with the connecting frame 455. The rotational motion is converted into the horizontal axial linear displacement of the guide seat 452 through the change of tilt angle. The transmission is smooth, the stroke is controllable, and the structure is compact.

[0056] The articulated frame 456 adopts a nested telescopic structure, consisting of an outer telescopic sleeve and an inner telescopic block that slide together, providing axial adaptive telescopic compensation capability. The telescopic sleeve is pre-installed with an elastic friction block 457, which is always elastically pressed against the outer wall of the telescopic block. The friction resistance is set to be greater than the conventional driving force of the drive component on the guide seat 452. During normal synchronous adjustment, the friction resistance can drive the telescopic block to move synchronously. When individual adjustment is obstructed, it can overcome the friction resistance and automatically telescopically avoid it, realizing mechanical adaptive overload compensation.

[0057] Example 2: The difference from Example 1 is that; See attached document Figure 5 , Figure 10 and Figure 11 The driving component of this invention has three built-in programmable control modes to adapt to different tool positioning and reference calibration conditions, and achieves automated and precise control through CNC system logic switching: Mode 1 is the dual-tool synchronous telescopic adjustment mode: It is suitable for working conditions where two tools need to change the axial machining depth synchronously. The drive motor 454 rotates in the forward or reverse direction to drive the connecting frame 455 to deflect. The two sets of hinge frames 456 synchronously push or pull the two guide seats 452 to move equidistantly along the guide column 451 in opposite directions, so as to realize the synchronous and equal adjustment of the extension length of the drill 42 and the milling cutter 43, and keep the reference symmetry relationship of the two tools unchanged.

[0058] Mode 2 is a single-tool independent telescopic adjustment mode: suitable for individual adjustment conditions of single-tool assembly error and wear compensation; during adjustment, the electromagnetic locking part 453 corresponding to one of the guide seats 452 is locked by power-on, so that it cannot slide axially, while the electromagnetic locking part 453 of the other guide seat 452 is de-energized and unlocked; the drive motor 454 continues to operate normally, and the telescopic block inside the hinge frame 456 on the obstructed side automatically telescopically compensates for the resistance of the friction block 457, only driving the unlocked side guide seat 452 and the corresponding tool to make axial displacement, accurately completing the single-tool reference position calibration.

[0059] Mode 3 is the dual-tool symmetrical reference self-calibration mode: used for automatic reset calibration of dual-tool reference offset after long-term use; drive motor 454 drives the two guide seats 452 to move towards each other to the mechanical limit position, relying on the mechanical limit to achieve initial centering; drive motor 454 operates under small continuous overload, forcing the articulated bracket 456 telescopic block to adaptively slide to the axial middle reference position of the telescopic sleeve, completing the automatic reset of the mechanical reference of the two tools. At the same time, the outer wall of the locking sleeve 462 is equipped with scale marks or integrated displacement sensors to collect tool telescopic displacement data in real time and feed it back to the CNC system, forming a closed-loop precise control to ensure that the positioning accuracy is traceable and can be monitored in real time.

[0060] Example 3: The difference from Example 1 is that; See attached document Figure 4 , Figure 5 and Figure 9 The rotating assembly 50 is a power unit that provides independent rotary cutting power for the drill bit 42 and the milling cutter 43. It includes a rotary motor 51 with variable frequency speed control for forward and reverse rotation, a central rotating shaft 52, two sets of one-way bearings 53, and a transmission assembly 54. The rotating shaft 52 is rotatably supported at the center position inside the clamping body 41 by rotating brackets at both ends. Its rotation axis is strictly coincident with the center reference point of the clamping body 41 to ensure that the rotation reference of the two cutters is unified.

[0061] One-way bearings 53 with opposite rotation directions are respectively installed at the left and right ends of the rotating shaft 52. The outer ring of the one-way bearing 53 is rigidly fixed to the end of the rotating shaft 52, and the inner ring is fixedly connected to the telescopic column P1. The two sets of one-way bearings 53 are locked in opposite directions. Utilizing the mechanical characteristics of the one-way bearings 53 to transmit torque in one direction and rotate freely in the opposite direction, when the rotating motor 51 drives the rotating shaft 52 to rotate clockwise through the transmission group 54, only one side of the one-way bearing 53 is locked to transmit torque, driving the corresponding telescopic column P1 and the tool to rotate and cut, while the other side of the one-way bearing 53 rotates freely and slips, and the tool remains stationary. When rotating counterclockwise, the other tool is switched to rotate independently, realizing the time-sharing drive of the two tools by a single motor to rotate independently, eliminating the need for a dual-motor independent drive structure, simplifying the layout and reducing energy consumption.

[0062] The locking sleeve 462 has an axially shaped expansion groove P2. The outer section of the expansion column P1 and the expansion groove P2 are perfectly matched with a polygonal irregular surface, which can slide freely in the axial direction and have no relative rotation in the circumferential direction. It can not only adapt to the axial extension and extension adjustment of the tool, but also reliably transmit the rotational torque and avoid torque transmission slippage failure.

[0063] The rotary motor 51 is fixed in the reserved mounting position inside the clamping body 41. It achieves speed reduction transmission with the rotary shaft 52 through worm gear transmission or bevel gear meshing transmission group 54. The output speed and torque can be adjusted according to different process requirements of drilling and milling, matching the cutting characteristics of high torque and low speed in drilling and high speed and constant power in milling.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A turning-drilling-milling composite CNC lathe, comprising a lathe body (10) and a turning mechanism (20) and a drilling-milling composite mechanism (40) disposed inside the lathe body (10), wherein a chuck is installed at the output end of the spindle mechanism inside the lathe body (10), and the drilling-milling composite mechanism (40) is installed inside the lathe body (10) via a displacement adjustment module (30), characterized in that: The drilling and milling compound mechanism (40) includes a clamping body (41), a drill bit (42), a milling cutter (43), a shifting motor (44), and a tool extension and retraction adjustment assembly (45); the drill bit (42) and the milling cutter (43) are arranged symmetrically with the center position of the clamping body (41), and the drill bit (42) and the milling cutter (43) are driven to rotate by the rotating assembly (50); The shifting motor (44) is used to drive the drill bit (42) and the milling cutter (43) to reciprocate and shift relative to the clamping body (41), so as to realize the automatic switching between drilling and milling modes; The tool extension adjustment assembly (45) is respectively assembled at the connection position of the drill bit (42), the milling cutter (43) and the clamping body (41). The tool extension adjustment assembly (45) is used to adjust the extension length of the drill bit (42) and the milling cutter (43) separately, so as to calibrate the reference position of the two tool tips and eliminate the tool assembly length error.

2. The turning-drilling-milling composite CNC lathe according to claim 1, characterized in that: The clamping body (41) is cylindrical in shape and is rotatably connected to the main support of the drilling and milling compound mechanism (40) through two rotating shafts. The shifting motor (44) is fixed on the main support of the drilling and milling compound mechanism (40), and its output shaft is fixedly connected to one of the rotating shafts. The shifting motor (44) drives the clamping body (41) to drive the drill bit (42) and the milling cutter (43) to perform a fixed angle reciprocating swing switching. Each switching only makes one of the tools align with the columnar workpiece to be processed to complete the cutting operation, while the other tool is in an idle avoidance state. The main support is equipped with at least one fixing module for fastening the rotating shaft after rotation, so that the drill bit (42) and the milling cutter (43) after conversion are in a stable state; at least one rotating shaft is hollow and is used to clamp the wiring inside the main body (41); The drill bit (42) and the milling cutter (43) are respectively movably inserted into the symmetrical positions on both sides of the clamping body (41) through the positioning locking part (46) of the tool extension adjustment assembly (45). The rotation center of the two tools coincides with the center reference point of the clamping body (41). The CNC system completes the position calibration of the two tools with the center of the clamping body (41) as the unified coordinate reference.

3. A turning-drilling-milling composite CNC lathe according to claim 2, characterized in that: The positioning locking member (46) includes a locking sleeve (462) mounted on the end of the clamping body (41) via a rotating bearing (461), one end of the locking sleeve (462) extending into the interior of the clamping body (41) and connected to the adjusting end of the tool telescopic adjustment assembly (45); The bottom of the locking sleeve (462) is provided with a mounting groove for inserting the tool mounting part. The tool is fixed by the expansion of the inner surface of the mounting groove.

4. A turning-drilling-milling composite CNC lathe according to claim 3, characterized in that: The locking sleeve (462) has a storage cavity Y1 and a pressure cavity Y2 inside. An inlet Y3 is provided between the storage cavity Y1 and the pressure cavity Y2 for the oil stored in the storage cavity Y1 to enter the pressure cavity Y2. The inlet Y3 is flared to increase the oil pressure in the pressure cavity Y2. The storage cavity Y1, the pressure cavity Y2 and the inlet Y3 are all annular and coincide with the axis of the mounting groove. The inner surfaces of the pressure chamber Y2 and the mounting slot are metal expansion layers, which are used to expand the metal expansion layer toward the center of the mounting slot by increasing the hydraulic pressure in the pressure chamber Y2, thereby fixing the prop. The outer surface of the locking sleeve (462) is provided with a filling through hole that communicates with the inside of the storage cavity Y3, and the inside of the filling through hole is connected to a bolt rod (463) with a thread. One end of the bolt rod (463) is provided with a sealing element, which is used to adjust the oil pressure inside the storage cavity Y1 by moving the bolt rod (463) inside the filling through hole.

5. A turning-drilling-milling composite CNC lathe according to claim 3, characterized in that: The outer ring of the rotating bearing (461) is fixed to the end of the clamping body (41), and the inner ring is provided with a number of strip-shaped guide grooves (464). The outer surface of the locking sleeve (462) is fixed with a number of strip-shaped guide parts (465) for sliding inside the strip-shaped guide grooves (464), so that the locking sleeve (462) can rotate through the rotating bearing (461) and can be driven by the tool telescopic adjustment assembly (45) to perform telescopic adjustment.

6. A turning-drilling-milling composite CNC lathe according to claim 5, characterized in that: The strip guide (465) has a centrifugal groove (466) inside, and a centrifugal block (467) is movably arranged in the centrifugal groove (466). Both ends of the centrifugal block (467) are trapezoidal protrusions. The inner wall of the centrifugal groove (466) and the inner surface of the strip guide groove (464) are both set as recessed areas A that match the ends of the centrifugal block (467). By rotating the locking sleeve (462) to a certain height, the two ends of the centrifugal block (467) move radially to the two recessed areas A through centrifugal force. When drilling or milling, the strip guide groove (464) and the strip guide (465) are frictionally locked to improve the accuracy during drilling or milling. The recessed area A of the strip guide groove (464) and the trapezoidal protrusion at one end of the centrifugal block (467) are designed to be mutually matching concave and convex surfaces, which are used to indirectly increase the stability of the strip guide part (465) inside the strip guide groove (464). The bottom of the centrifugal block (467) is provided with several cylindrical guide grooves. The bottom of the centrifugal groove (466) is fixed with several positioning parts for insertion into the cylindrical guide grooves. The outer surface of the positioning part is provided with an elastic damping sleeve. The inner surface of the cylindrical guide groove is provided with two limiting ring grooves for positioning the elastic damping sleeves, which are used to position the centrifugal block (467) in the front and back states during centrifugal motion. The positioning part has a gap channel J inside that connects the cylindrical guide groove and the mounting through groove. This gap channel J is used to release the pressure inside the cylindrical guide groove when the positioning part moves in and out of the cylindrical guide groove. The diameter of the gap channel J is ≤1 mm.

7. A turning-drilling-milling composite CNC lathe according to claim 1, characterized in that: The tool telescopic adjustment assembly (45) includes at least two guide posts (451), two guide seats (452), and a drive for displacing one or both guide seats (452) along the axial direction of the guide posts (451); Two guide posts (451) are symmetrical, and their ends are fixed inside the clamping body (41). Two guide seats (452) are symmetrically slidably connected between the two guide posts (451). The ends of the two guide seats (452) are fixed with rotating sleeves, and the two rotating sleeves are rotatably connected to the outer surface of the locking sleeve (462). When the driving component moves one or both guide seats (452) axially along the guide post (451), the locking sleeve (462) is used to adjust the extension and retraction of the drill bit (42) or the milling cutter (43). At least two electromagnetic locking elements (453) are installed on the two guide seats (452) to lock the guide post (451), which are used to electromagnetically lock the guide seat (452) with axial displacement, thereby increasing the stability and connection strength of the drill bit (42) or milling cutter (43) during the working process and after feeding.

8. A turning-drilling-milling composite CNC lathe according to claim 7, characterized in that: The drive unit includes a drive motor (454) that can be driven in both directions, a connecting frame (455), and two hinge frames (456). The drive motor (454) is fixed to the outer surface of the clamping body (41), and the output shaft extends into the interior of the clamping body (41) and is fixed to the center of the connecting frame (455). Two hinge frames (456) are respectively hinged to both ends of the connecting frame (455), and the other end is respectively hinged to two guide seats (452). The two hinge frames (456) are inclined. When the connecting frame (455) is rotated and adjusted by the drive motor (454), the two hinge frames (456) move in a fan shape, forming the axial displacement of the two guide seats (452). The hinge frame (456) consists of a telescopic sleeve and a telescopic block. The telescopic block is located inside the telescopic sleeve and moves in a telescopic motion. The telescopic sleeve is provided with a friction block (457) that elastically abuts against the telescopic block. The abutting force between the friction block (457) and the telescopic block is greater than the driving force of the driving member on the two guide seats (452).

9. A turning-drilling-milling composite CNC lathe according to claim 8, characterized in that: The drive unit includes three drive modes: Mode 1: When it is necessary to make axial displacement of the two positioning locking parts (46) to form synchronous extension and retraction adjustment of the drill bit (42) and the milling cutter (43), the connecting frame (455) is driven to rotate by the drive motor (454), so that the two hinge frames (456) and the two guide seats (452) are displaced relative to each other or separated, forming synchronous adjustment of the drill bit (42) and the milling cutter (43); Mode 2: When one of the positioning locking parts (46) needs to be axially displaced to form the extension and retraction adjustment of the drill bit (42) or the milling cutter (43), all the electromagnetic locking parts (453) on the guide seat (452) connected to the positioning locking part (46) are disabled, and all the electromagnetic locking parts (453) on the other guide seat (452) are simultaneously activated. When the two guide seats (452) are indirectly driven to move axially through the drive motor (454), since one of the guide seats (452) is locked, it cannot move, thus forming the individual adjustment of the drill bit (42) or the milling cutter (43); Mode 3: When it is necessary to symmetrically calibrate the positions of the two positioning locking parts (46), the two guide seats (452) are moved in opposite directions by the drive motor (454). When the two guide seats (452) move to their limit positions in opposite directions, the telescopic block in the fully retracted or fully extended hinge frame (456) can be telescopically displaced by the continuous movement of the drive motor (454). When the inner end of the telescopic block in the hinge frame (456) moves to the middle position of the telescopic sleeve, the reset adjustment can be completed. The outer surface of the locking sleeve (462) is provided with scale marks or displacement sensors to monitor the telescopic adjustment position of the locking sleeve (462) in real time.

10. A turning-drilling-milling composite CNC lathe according to claim 3, characterized in that: The rotating assembly (50) includes a rotating motor (51) that can rotate in both directions and a rotating shaft (52). Both ends of the rotating shaft (52) are connected to telescopic columns P1 through one-way bearings (53). The locking sleeve (462) has a telescopic groove P2 inside for the telescopic column P1 to be inserted and to slide in and out. The cross sections of the telescopic column P1 and the telescopic groove P2 are both irregularly shaped surfaces that match each other. The two one-way bearings (53) are locked in opposite directions, and the outer ring of the bearing is fixed to the rotating shaft (52) and the inner ring is fixed to the telescopic column P1. When the rotating shaft (52) is driven to rotate clockwise or counterclockwise by the rotating motor (51), only one one-way bearing (53) can drive one telescopic column P1 to rotate, while the other one-way bearing (53) is in an idle state. The rotating shaft (52) is rotatably connected to the inside of the clamping body (41) through the rotating frame, and the rotation center coincides with the center reference point of the clamping body (41). The rotating motor (51) is connected to the rotating shaft (52) through the transmission group (54).

Images