Inclined bed multi-station combined numerical control machining center

Abstract

The present application relates to a kind of inclined bed multi-station composite numerical control machining center, it is related to the field of composite numerical control machine tool, it includes inclined bed, first spindle, second spindle, first machining component, second machining component and workpiece operating mechanism, first machining component and second machining component are slidably arranged on inclined bed along the length direction of inclined bed, first spindle and second spindle are oppositely arranged at the both ends of inclined bed along the length direction of inclined bed, workpiece operating mechanism includes cross slide plate, support frame and clamping component;Cross slide plate is slidably arranged on inclined bed along the length direction of inclined bed, support frame is slidably arranged on cross slide plate along the width direction of inclined bed, clamping component is rotatably arranged on support frame, for clamping workpiece on first spindle or second spindle.The present application can automatically exchange the position of workpiece on two stations, not only saves manual intervention, but also can complete the machining of two ends of two workpieces in the same cycle, significantly improves production efficiency.

Description

Technical Field

[0001] This invention relates to the field of composite CNC machine tools, and in particular to a slant bed multi-station composite CNC machining center. Background Technology

[0002] A multi-functional CNC machining center integrates multiple machining functions on the same machine tool, typically including turning, milling, drilling, and other processes. It can complete multiple machining processes in a single setup, reducing the number of workpiece clamping operations and thus shortening the machining cycle. The slant bed design can increase the reliability and stability of the machine tool and improve machining accuracy. In order to improve machining efficiency, some existing CNC machining centers will set up multiple machining stations on the lathe to clamp and process multiple workpieces simultaneously.

[0003] Currently, Chinese patent application with publication number CN118990017A and publication date November 22, 2024, proposes a dual-spindle spherical turning, grinding, and chamfering integrated CNC machine tool, including a machine base, fixed tables fixed at both ends of the top of the machine base, and spindle boxes fixedly mounted on each fixed table. A slant bed is provided on one side of the machine base, and a first spindle and a second spindle arranged opposite to each other are respectively assembled and connected in the two sets of spindle boxes. Servo motors are fixedly mounted on both sides of the machine base, and the first spindle and the second spindle are respectively connected to the corresponding servo motors for transmission. A set of sliding lead screw pairs is symmetrically arranged at both ends of the slant bed surface, and a tool post plate is slidably mounted on each sliding lead screw pair.

[0004] In use, the symmetrically arranged sliding screw pairs drive the corresponding tool holder plates to slide on the sliding screw pairs. When the first spindle and the second spindle clamp the workpiece, the two sets of tool holder plates will drive the tool assemblies to process the two workpieces on the first spindle and the second spindle respectively.

[0005] Regarding the aforementioned technologies, the first tool holder plate, in conjunction with the first spindle, and the second tool holder plate, in conjunction with the second spindle, can simultaneously process one end of two workpieces. However, when both ends of a workpiece need to be processed, manual operation is required to remove the workpieces from the first and second spindles and manually change the orientation of the workpieces before processing the other end of the workpiece, which affects production efficiency. Summary of the Invention

[0006] In order to enable the machining processes of multi-station machine tools to cooperate with each other, and to process both ends of the workpiece without manually changing the workpiece orientation, thereby improving production efficiency, this invention provides a slant bed multi-station composite CNC machining center.

[0007] This invention provides a slant bed multi-station composite CNC machining center, employing the following technical solution:

[0008] A slant bed multi-station composite CNC machining center includes a slant bed, a first spindle, a second spindle, a first machining assembly, and a second machining assembly. Both the first and second machining assemblies are slidably mounted on the slant bed along its length. The first and second spindles are positioned opposite each other at both ends of the slant bed along its length. The center also includes a workpiece moving mechanism, comprising a transverse plate, a support frame, and a clamping assembly. The transverse plate is slidably mounted on the slant bed along its length, and the support frame is slidably mounted on the transverse plate along its width. The clamping assembly includes a rotary table, multiple chuck assemblies, and a drive unit. The drive unit is fixedly mounted on the support frame, and the rotary table is rotatably mounted on the support frame. The drive unit drives the rotary table to rotate on the support frame. The multiple chuck assemblies are evenly distributed along the edge of the rotary table.

[0009] By adopting the above technical solution, when machining shaft-type workpieces, two workpieces are respectively clamped on the first spindle and the second spindle. Then, the first machining assembly is used to machine the workpiece on the first spindle, and the second machining assembly is used to machine the workpiece on the second spindle. When one end of the workpiece on both the first and second spindles is machined, firstly, the turntable in the workpiece transport mechanism rotates under the control of the drive component, while simultaneously the support frame slides on the transverse plate, positioning the chuck assembly on the turntable in a position corresponding to the workpiece on the first spindle. Then, the transverse plate slides along the length of the machine tool, positioning the chuck assembly... The head assembly moves to the position corresponding to the workpiece on the first spindle. Then, the chuck assembly clamps the workpiece on the first spindle, and the first spindle releases the workpiece. The drive unit then controls the turntable to rotate, so that another chuck assembly on the turntable corresponds to the workpiece on the second spindle. At the same time, the transverse plate is controlled to move towards the second spindle, so that the other chuck clamps the workpiece on the second spindle. After the workpiece is removed from the second spindle, the turntable rotates again and slides in coordination with the transverse plate to install the workpiece removed from the first spindle into the second spindle, and the workpiece removed from the second spindle into the first spindle.

[0010] Thus, after the workpieces at the first and second spindle stations are processed, the workpieces held on the first and second spindles can be swapped using the workpiece transport mechanism to process the other end of the workpieces. This eliminates the need for manual swapping of the workpieces on the first and second spindles, allowing both stations to process two workpieces simultaneously, and also enabling processing of both ends of the workpieces. Furthermore, the blank material can be pre-fixed on other chuck components of the workpiece clamping structure, so that after the workpieces on the first and second spindles are processed, the workpiece transport mechanism automatically loads the blank, improving loading efficiency. When processing long shaft workpieces, the chuck assembly can be used to clamp the suspended end of the workpiece, and the chuck assembly can be moved to the vicinity of the workpiece processing area, providing support for the suspended workpiece and improving the stability of the workpiece during processing, thereby enhancing the processing accuracy.

[0011] Optionally, the turntable is provided with a clamping hole; the chuck assembly includes a drive ring, multiple jaws, and connecting rods corresponding to the jaws. The drive ring is rotatably disposed in the clamping hole, and the multiple jaws are evenly distributed in a ring inside the clamping hole. One end of each jaw is rotatably connected to the inner wall of the clamping hole, and the other end of each jaw is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the drive ring; the drive ring is driven by a power assembly.

[0012] By adopting the above technical solution, the grippers can rotate inside the clamping hole around the gripper and one end connected to the inner wall of the clamping hole. When the drive ring rotates inside the clamping hole, the drive ring will drive the end of the connecting rod connected to the drive ring to rotate, so that the connecting rod rotates relative to the rotating ring. The other end of the connecting rod is rotatably connected to the gripper, so that when the connecting rod rotates, the end of the connecting rod connected to the gripper will abut against the gripper, causing the end of the gripper connected to the connecting rod to move towards a position closer to the center of the clamping hole. The grippers, which are evenly distributed in a ring inside the clamping hole, all move towards the center of the clamping hole, so that multiple grippers can clamp the workpiece inside the clamping hole. At the same time, since the grippers are evenly distributed in a ring inside the clamping hole, and the drive ring drives multiple grippers simultaneously through multiple connecting rods, the grippers will rotate synchronously when clamping the workpiece, thus achieving a self-centering effect when clamping the workpiece, clamping the workpiece at the axis of the clamping hole.

[0013] Thus, by synchronously driving multiple grippers through the drive ring and multiple connecting rods, multiple grippers can rotate synchronously when gripping the workpiece, achieving self-centering of the chuck assembly when gripping the workpiece; when the chuck assembly grips the workpiece, it restricts the workpiece to be fixed at the current angle, so that when the workpiece moving mechanism changes the position of the workpiece between the first spindle and the second spindle, it reduces the torsion on the workpiece angle, thereby improving the accuracy of the groove position at both ends of the workpiece when milling grooves on the sides of both ends of the workpiece.

[0014] Optionally, the chuck assembly is externally provided with a rotating component, which includes a clamping cylinder, a clamping member, and a power member. The clamping cylinder is rotatably disposed inside the clamping hole, the clamping member is disposed on the outer circumferential surface of the clamping cylinder, and the power member is fixedly disposed on the turntable. The power member is used to drive the clamping member to clamp the clamping cylinder; multiple jaws are rotatably disposed on the clamping cylinder.

[0015] When machining long shaft workpieces, if one end of the workpiece is clamped on the first or second spindle for machining, the other end of the workpiece is suspended in the air. The suspended end of the workpiece is not supported, and especially during the rotation of the workpiece, the suspended end of the workpiece will swing, which will reduce the machining accuracy of the workpiece.

[0016] By adopting the above technical solution, when the power component drives the clamping component to press against the outer circumferential surface of the clamping cylinder, the friction between the clamping component and the clamping cylinder fixes the clamping cylinder inside the clamping hole. At this time, the rotating ring and the clamping cylinder rotate, which can fix the workpiece by the jaws. When machining long shaft workpieces, one end of the workpiece is clamped and fixed on the first spindle, and the other end of the workpiece is fixed inside the clamping cylinder by the jaws inside the clamping cylinder. Then the clamping component releases the clamping cylinder, and the workpiece can drive the clamping cylinder to rotate inside the clamping hole, so that both ends of the workpiece can be stably supported when machining the workpiece, thereby improving the machining accuracy of the workpiece. When it is necessary to fix the workpiece, after the jaws clamp the workpiece inside the clamping cylinder, the clamping component fixes the clamping cylinder to restrict the rotation of the workpiece.

[0017] Thus, by setting up a clamping sleeve and a stopper, when machining long shaft workpieces, the chuck assembly can be controlled to clamp and fix the workpiece inside the clamping sleeve, and the stopper can be used to restrict the rotation of the clamping sleeve. When machining the workpiece, the end of the workpiece can be supported or rotated to reduce the swaying caused by the workpiece being suspended in the air and improve the machining accuracy of the workpiece.

[0018] Optionally, the drive ring is provided with a spiral structure;

[0019] The power assembly includes a telescopic member, an abutment member, and a guide member. The guide member is sleeved outside the clamping cylinder and is slidably disposed with the clamping cylinder. The guide member is provided with a guide structure, which is configured to cooperate with the spiral structure. One end of the telescopic member is fixedly disposed on the turntable, and the other end of the telescopic member is rotatably connected to the guide member through the abutment member.

[0020] When the clamp supports the workpiece by rotation, the workpiece will cause the clamp to rotate. The power component that controls the relative rotation between the drive ring and the clamp needs to keep the relative position between the drive ring and the clamp at all times after clamping the workpiece in order to provide sufficient clamping force for the workpiece. Fixing the power component on the clamp will affect the dynamic balance of the clamp, affect the stability of the clamp when rotating, and lead to a decrease in the machining accuracy of the workpiece.

[0021] By adopting the above technical solution, when the telescopic component extends, it will cause the abutment and guide to slide relative to the outer circumference of the clamping cylinder. The distance between the drive ring and the clamping cylinder is fixed, which allows relative sliding between the guide and the drive ring. When the guide and the drive ring slide relative to each other, the guide structure on the guide will cooperate with the spiral structure on the drive ring, so that the drive ring can rotate relative to the clamping cylinder as the guide moves. When the drive ring and the clamping cylinder rotate relative to each other, the jaws can be controlled to clamp. After the drive ring rotates to the corresponding position and clamps the workpiece, the telescopic component is locked in the current position, so that the jaws maintain the corresponding clamping force. After the jaws clamp the workpiece and rotate with the workpiece, the positional relationship between the drive ring, the guide, and the clamping cylinder is relatively fixed, and the guide is rotatably connected to the telescopic component through the abutment, so that when the workpiece drives the clamping cylinder to rotate, the drive ring and the guide will rotate together with the workpiece.

[0022] In this way, by setting up telescopic components and guide components, and cooperating the guide structure on the guide component with the spiral structure on the drive ring, the telescopic motion of the telescopic component is converted into the rotational motion of the drive ring. The telescopic component and the guide component are rotatably connected by the abutment component, so that the guide component can rotate with the drive ring while restricting the rotation of the drive ring. There is no need to install the power component on the clamp, which reduces the impact of the clamp rotation on stability and thus reduces the impact on the machining accuracy of the workpiece.

[0023] Optionally, the turntable is further provided with an angle positioning component and a rotating component. The angle positioning component is used to identify the rotation angle of the clamping cylinder, and the rotating component is fixedly mounted on the turntable and is used to drive the clamping cylinder to rotate.

[0024] When milling grooves at both ends of a shaft-type workpiece, if the positions of the milled grooves at both ends of the workpiece do not correspond, it is necessary to rotate the workpiece and adjust its angle to control the position of the milled groove when moving the workpiece from the first spindle to the second spindle. By adopting the above technical solution, after the workpiece is removed from the first spindle and clamped and fixed inside the clamp, the rotating component controls the clamp to drive the workpiece to rotate. The angle positioning component monitors the rotation angle of the clamp in real time, so that after the workpiece is moved from the first spindle to the second spindle, the workpiece has rotated to the corresponding angle. Then, the second spindle can be used to clamp the workpiece to mill grooves on the side of the workpiece.

[0025] Thus, by setting up rotating components and angle positioning components, the workpiece can be controlled to rotate at a specific angle after it is fixed inside the chuck. This allows the workpiece to be fixed on the first or second spindle and can be processed without adjusting the rotation, improving the processing efficiency. At the same time, when cutting long shaft workpieces, the rotating components can drive the chuck and spindle to rotate synchronously, thereby causing both ends of the long shaft workpiece to rotate synchronously. This reduces the torque on the long shaft workpiece when one end of the spindle actively rotates and drives the other end to rotate, thereby reducing the stress concentrated inside the long shaft workpiece, reducing the probability of workpiece deformation, and minimizing the impact on workpiece performance.

[0026] Optionally, the angle positioning component includes a magnet and a Hall sensor. The magnet is fixedly mounted on the clamping cylinder, and multiple Hall sensors are provided. The multiple Hall sensors are evenly distributed in a ring on the inner wall of the clamping hole, and each of the multiple Hall sensors is corresponding to the magnet.

[0027] By adopting the above technical solution, when the magnet rotates to a position near the Hall sensor, the closer the magnet is to the Hall sensor, the stronger the magnetic field near the Hall sensor. When the current flowing through the Hall sensor is fixed, the voltage inside the Hall sensor will increase with the increase of the magnetic field. Therefore, by monitoring the voltage of the Hall sensor at different positions, the position of the magnet can be determined, and then the rotation angle of the clamp can be calculated.

[0028] Thus, by using a magnet in conjunction with the first sensor, the magnet and the first sensor do not need to be in direct contact during use, which can reduce the impact on the rotation of the clamping cylinder. At the same time, the Hall effect sensor can be used to detect the rotation angle of the clamping cylinder, thereby detecting the rotation angle of the workpiece in real time during the workpiece machining process. When the clamping cylinder is driven to rotate by the rotating component, the Hall effect sensor can accurately identify the rotation angle of the workpiece and control the rotation of the clamping cylinder through the rotating component, thereby controlling the rotation angle of the workpiece. This allows for precise control of the milling angle when milling grooves on the side of shaft-type workpieces.

[0029] Optionally, multiple magnets are provided, and the multiple magnets are evenly distributed in a ring on the clamp, and the magnetic forces of the multiple magnets are different.

[0030] When only one magnet is used, if the magnet is far from all the Hall sensors, the magnetic field at the Hall sensor location will be weak, making it difficult for the Hall sensor and magnet to accurately identify the rotation angle of the clamp. By using the above technical solution, when multiple magnets are used, at any angle during clamp rotation, one magnet will be close to one of the Hall sensors, allowing the Hall sensors to be more accurately magnetized and thus more accurately identify the rotation angle of the clamp. The different magnetic forces of the multiple magnets are designed so that when different magnets rotate to the closest position to one of the Hall sensors, the peak voltage drop generated by the Hall sensor will be different, thus distinguishing the positions of the magnets at different locations and calculating the rotation angle of the clamp more accurately.

[0031] In this way, using multiple different magnets in conjunction with the Hall sensor for detection not only increases the sensitivity of the Hall sensor and improves the accuracy of identifying the rotation angle of the clamp, but also serves as a multiple verification function, reducing the probability of failing to detect Hall sensor malfunctions in a timely manner. At the same time, setting multiple magnets also serves as a backup; if one magnet fails, the other magnets are used in conjunction with the Hall sensor to calculate the rotation angle of the clamp.

[0032] Optionally, the distance from the axis of the turntable to the surface of the slant bed is equal to the distance from the axis of the first spindle to the surface of the slant bed, and the support frame is slidably arranged along the inclination direction of the slant bed.

[0033] By adopting the above technical solution, since the distances from the axis of the rotary table and the axis of the first spindle to the slant bed surface are the same, when adjusting the clamping hole to be coaxial with the first spindle, setting the line connecting the clamping hole and the rotary table as perpendicular to the vertical line between the rotary table and the slant bed surface ensures that the distances from the axis of the clamping hole and the axis of the first spindle to the slant bed surface are the same. Then, adjusting the support frame to slide along the transverse plate controls the coaxiality of the clamping hole and the first spindle. Thus, by setting the support frame and rotary table in accordance with the slant bed's tilt direction, the adjustment method for coaxializing the clamping hole with the first spindle becomes much simpler.

[0034] In summary, the present invention has at least one of the following beneficial technical effects:

[0035] Through the linkage design of the turntable and the transverse plate, the automatic exchange of workpiece positions and rotation angle control between the first spindle and the second spindle are realized. The rotation of the turntable and the lateral sliding of the support frame work together to enable the chuck assembly to accurately grab and transfer the workpiece. With the synchronous processing of the first spindle and the second spindle, not only is manual intervention eliminated, but the processing of both ends of two workpieces can also be completed in the same cycle, which significantly improves production efficiency.

[0036] The chuck assembly adopts a mechanical self-locking linkage design of drive ring-connecting rod-clamping jaws. By synchronously driving the rotation of multiple jaws, it can achieve self-centering clamping of the workpiece. With the rotational support mechanism of the chuck and the clamping member, in the machining of long shafts, the clamping member can both clamp the chuck to fix the workpiece and release the clamping member, so that the chuck rotates with the workpiece, effectively suppressing the swaying caused by the workpiece in the suspended state and improving the machining accuracy.

[0037] By combining a ring-shaped multi-magnet array with different magnetic forces and a Hall sensor, non-contact detection of the clamp rotation angle is achieved. The multi-magnet layout not only improves the resolution of the clamp rotation angle, but also increases the ability to handle special situations and improves the reliability of clamp rotation angle positioning through magnetic force differences and the setting of multiple Hall sensors. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the overall structure of the workpiece operating mechanism in an embodiment of the present invention;

[0040] Figure 3 This is a front structural schematic diagram of the workpiece operating mechanism in an embodiment of the present invention;

[0041] Figure 4 yes Figure 3 Enlarged view of part A in the middle;

[0042] Figure 5 yes Figure 4 Sectional view of AA;

[0043] Figure 6 yes Figure 5 BB section view;

[0044] Figure 7 This is an exploded view of the clamp assembly structure according to an embodiment of the present invention.

[0045] Explanation of reference numerals in the attached drawings: 100, slant bed; 110, first spindle; 120, second spindle; 130, first machining assembly; 140, second machining assembly; 200, workpiece moving mechanism; 210, transverse plate; 220, support frame; 300, clamping assembly; 310, rotary table; 311, clamping hole; 320, driving component; 400, chuck assembly; 410, driving ring; 411, helical structure; 420, gripper; 430, connecting rod; 500, power assembly; 510, telescopic component; 520, abutment component; 530, guide component; 531, guide structure; 600, rotating assembly; 610, chuck; 620, abutment component; 630, power component; 700, angle positioning assembly; 710, rotating component; 720, magnet; 730, Hall sensor. Detailed Implementation

[0046] The following combination Figures 1 to 7 The present invention will be described in further detail below.

[0047] This invention discloses a slant bed multi-station composite CNC machining center. (Refer to...) Figures 1 to 3 A slant bed multi-station composite CNC machining center mainly includes a slant bed 100, a first spindle 110 and a second spindle 120 disposed opposite to each other at both ends of the slant bed 100, a first machining assembly 130 mounted on the slant bed 100 and corresponding to the first spindle 110, a second machining assembly 140 mounted on the slant bed 100 and corresponding to the second spindle 120, and a workpiece clamping assembly 300 mounted on the slant bed 100. When machining shaft-type workpieces, two workpieces can be clamped respectively at the first spindle 110 and the second spindle 120. Then, the first machining component 130 is used to process the workpiece on the first spindle 110, and the second machining component 140 is used to process the workpiece on the second spindle 120. When processing the other end of the shaft workpiece, the workpiece clamping component 300 can be used to switch the positions of the workpiece on the first spindle 110 and the workpiece on the second spindle 120 to process the other end of the shaft workpiece. No human intervention is required. It can process both ends of the shaft workpiece and process two workpieces at the same time, which significantly improves the processing efficiency of the workpiece.

[0048] Reference Figure 1 The slant bed 100 is an inclined bed with its surface at a 45-degree angle to the horizontal. High-precision guide rails are installed on both sides of the bed surface, and a workpiece machining space is reserved in the middle of the slant bed 100. The first spindle 110 and the second spindle 120 are fixed at both ends of the slant bed 100, and the first spindle 110 and the second spindle 120 are arranged opposite each other. The axes of the first spindle 110 and the second spindle 120 are collinear and parallel to the bed surface. Standard chucks are provided at the opposite ends of the first spindle 110 and the second spindle 120 for clamping workpieces. The first machining assembly 13 The first machining component 130 and the second machining component 140 are respectively mounted on high-precision guide rails on the bed surface. The high-precision guide rails are arranged along the length direction of the slant bed 100. Both the first machining component 130 and the second machining component 140 include an independent turret and a slide for controlling the movement of the turret. The slide is slidably mounted on the high-precision guide rail and is driven by the high-precision guide rail to move along the length direction of the slant bed 100. The turret slides on the slide along the inclination direction of the bed surface of the slant bed 100. The turret is equipped with a multi-station tool magazine and can perform machining processes such as turning, drilling, and milling.

[0049] In this embodiment, both the first machining component 130 and the second machining component 140 are equipped with X-axis and Z-axis slides. The X-axis slide is fixedly mounted on the bed surface of the slant bed 100 and cooperates with a high-precision guide rail to drive the slide to move along the length direction of the slant bed 100. The Z-axis slide is fixedly mounted on the slide and is used to drive the turret to slide along the inclined direction of the bed surface of the slant bed 100. Both the Z-axis slide and the Z-axis slide are driven by ball screws.

[0050] When machining shaft-type workpieces, two workpieces are clamped on the first spindle 110 and the second spindle 120 respectively, and the first machining assembly 130 is used to machine the workpiece on the first spindle 110, and the second machining assembly 140 is used to machine the workpiece on the second spindle 120.

[0051] Reference Figure 1 The slant bed 100 has a reserved space in the middle where a slide rail is provided for controlling the movement of the workpiece moving mechanism 200. The slide rail is set along the length of the machine tool and is parallel to the high-precision guide rail, so that the workpiece moving mechanism 200 can move along the length of the machine tool after being installed on the slide rail.

[0052] Reference Figure 2 and Figure 3 The workpiece moving mechanism 200 includes a transverse plate 210, a support frame 220, and a clamping assembly 300. The transverse plate 210 is mounted on the slide rail of the slant bed 100 and is driven by a ball screw to slide along the length direction of the slant bed 100. The support frame 220 is slidably mounted on the transverse plate 210 and is provided with a ball screw for driving the support frame 220 to slide along the inclined direction of the bed surface of the slant bed 100. The clamping assembly 300 is mounted on the support frame 220 for clamping the workpiece on the spindle.

[0053] To facilitate the adjustment of the clamping assembly 300 to correspond with the first spindle 110 and the second spindle 120, the transverse plate 210 is arranged along the inclination direction of the slant bed 100, so that when the support frame 220 slides on the transverse plate 210, the sliding direction of the support frame 220 is consistent with the inclination direction of the slant bed 100.

[0054] Reference Figure 3 and Figure 4The clamping assembly 300 includes a turntable 310, a drive unit 320, and a chuck assembly 400. The turntable 310 has a cross-shaped structure and a connecting shaft in the middle. The turntable 310 is rotatably mounted on the support frame 220 via the connecting shaft in the middle. The drive unit 320 is a motor and is fixedly mounted on the support frame 220. The drive unit 320 is rotatably connected to the connecting shaft in the middle of the turntable 310 via a gear set, so that the drive unit 320 can drive the turntable 310 to rotate around the connecting shaft in the middle. The turntable 310 has four evenly distributed extension arms extending outward from the middle, making the turntable 310 have a cross-shaped structure. Each extension arm is provided with a clamping hole 311. The chuck assembly 400 is installed in the corresponding clamping hole 311. When the extension arm is perpendicular to the support frame 220, the height of the clamping hole 311 on the extension arm from the slant bed surface is the same as the height of the first spindle 110 from the slant bed surface 100.

[0055] When the chuck assembly 400 clamps the workpiece on the first spindle 110 or the second spindle 120, it is only necessary to adjust one of the extension arms of the turntable 310 to be perpendicular to the support frame 220, and then adjust the support frame 220 to slide on the transverse plate 210 so that the chuck assembly 400 corresponds to the first spindle 110 or the second spindle 120, which facilitates the clamping of the workpiece on the first spindle 110 or the second spindle 120.

[0056] Reference Figure 5 and Figure 6 The clamping hole 311 is provided with a chuck assembly 400 and a rotating assembly 600. The chuck assembly 400 is mounted on the rotating assembly 600 so that the chuck assembly 400 can rotate with the chuck 610. When processing long shaft workpieces, it is convenient to rotate and clamp the workpiece at the end of the workpiece, providing more stable support for the workpiece.

[0057] Reference Figure 6The rotating assembly 600 includes a clamping cylinder 610, a clamping member 620, and a power member 630. The clamping cylinder 610 is rotatably disposed inside the clamping hole 311, and the position of the clamping cylinder 610 in the clamping hole 311 is restricted by flange plates at both ends. The clamping member 620 is disposed outside the clamping cylinder 610, and a relief groove is provided inside the clamping hole 311. One end of the clamping member 620 is provided with a round hole and is rotatably connected to the relief groove by a pin and a torsion spring. The power member 630 is a clamping cylinder, and the piston of the clamping cylinder... The rod abuts against the end of the clamping member 620 away from the pin. When the clamping cylinder extends, it presses the clamping member 620 against the outer circumference of the clamping cylinder 610 to limit the rotation of the clamping cylinder 610. This is suitable for situations where the workpiece moving mechanism 200 provides static support for the workpiece. When the clamping cylinder shortens, the clamping member 620 disengages from the outer surface of the clamping cylinder 610 under the action of the torsion spring, allowing the clamping cylinder 610 and the chuck assembly 400 installed inside the clamping cylinder 610 to rotate. This is suitable for situations where the workpiece needs to be rotated and supported.

[0058] Reference Figure 4 The chuck assembly 400 includes a drive ring 410, multiple connecting rods 430, and grippers 420 corresponding to each connecting rod 430. The drive ring 410 is sleeved on the outer circumferential surface of the clamping cylinder 610 and is located at one end of the clamping cylinder 610. One end of each of the grippers 420 is rotatably mounted on the clamping cylinder 610. One end of each connecting rod 430 is located at the other end of each gripper 420, and the other end of each connecting rod 430 is rotatably mounted on the drive ring 410. The multiple connecting rods 430 and the multiple grippers 420 are evenly distributed in a ring. When the clamping cylinder 610 is fixed under the constraint of the clamping member 620, the end of each gripper 420 connected to the clamping cylinder 610 is fixed. At this time, rotation of the drive ring 410 will cause the connecting rods 430 to rotate, resulting in position changes. Since one end of the connecting rod 430 is rotatably connected to the gripper 420, and the position of the end of the gripper 420 connected to the clamping cylinder 610 remains unchanged, the connecting rod 430 and the gripper 420 will rotate relative to each other. Under the push of the drive ring 410, the connecting rod 430 and the end of the gripper 420 connected to each other will rotate towards the axis of the clamping cylinder 610. In this embodiment, the number of connecting rod 430 and gripper 420 is set to three. When the three grippers 420 rotate towards the axis of the clamping cylinder 610 at the same time, they can clamp the workpiece in the middle of the clamping cylinder 610. Under the action of the cooperation of the three grippers 420, the workpiece is pushed to the axis of the clamping cylinder 610 and clamped, realizing the self-centering function.

[0059] In order to increase the clamping force of the gripper 420, optimize the support force distribution of the gripper 420 and reduce interference between components, in this embodiment, both the gripper 420 and the connecting rod 430 adopt an arc-shaped design.

[0060] Reference Figure 5 and Figure 7The rotation of the drive ring 410 is driven by the power assembly 500, which includes a telescopic member 510, an abutment member 520, and a guide member 530. The guide member 530 is disposed between the drive ring 410 and the outer wall of the clamping cylinder 610. Specifically, a sandwich structure is provided between the drive ring 410 and the clamping cylinder 610. The guide member 530 has an annular structure and is disposed in the sandwich structure, so that the inner circumferential surface of the guide member 530 contacts the outer circumferential surface of the clamping cylinder 610. Corresponding slide rails and grooves are provided between the guide member 530 and the clamping cylinder 610. The slide rails follow the guide member 530. The axial direction of the guide 530 is set on the inner circumferential surface of the guide member 530. The slide groove is set on the outer circumferential surface of the clamping cylinder 610 along the axial direction of the clamping cylinder 610, and the slide rail is slidably set in the slide groove to move, so that the guide member 530 can only slide along the axial direction of the clamping cylinder 610. The outer circumferential surface of the guide member 530 contacts the inner circumferential surface of the drive ring 410. The outer circumferential surface of the guide member 530 is provided with a guide structure 531, and the corresponding inner circumferential surface of the drive ring 410 is provided with a spiral structure 411. The guide structure 531 is a semi-circular groove opened on the outer circumferential surface of the guide member 530. The semi-circular groove contains ball bearings. A spiral structure 411 on the inner circumferential surface of the drive ring 410 corresponds to the guide structure 531. When the guide member 530 moves relative to the drive ring 410 along its axial direction, the ball bearings roll within the spiral structure 411 and the guide structure 531. The guide member 530 can control the rotation of the drive ring 410 through the guide structure 531 and the spiral structure 411. The movement of the guide member 530 is controlled by the telescopic member 510. In this embodiment, the telescopic member 510 is a cylinder, allowing for... The air pressure of the cylinder can be adjusted to adapt the clamping force on the workpiece. There are three telescopic components 510 evenly distributed in a ring. One end of the telescopic component 510 is fixedly mounted on the flange plate at the end of the clamping hole 311, and the other end is connected to the abutment component 520. The abutment component 520 adopts a thrust bearing. One end of the thrust bearing is fixedly connected to the telescopic component 510, and the other end is fixedly connected to the guide component 530, so that when the telescopic component 510 extends or retracts, it can drive the guide component 530 to move. When the clamping cylinder 610 rotates, the clamping cylinder 610 will drive the drive ring 410 and the guide component 530 to rotate together.

[0061] When the telescopic member 510 extends, the guide member 530 moves towards the drive ring 410 under the drive of the telescopic member 510, causing the drive ring 410 to rotate clockwise and drive the connecting rod 430 and the gripper 420 to move and clamp the workpiece. Then the telescopic member 510 is fixed in the current position, and the positions of the drive ring 410 and the clamping cylinder 610 are locked to maintain the clamping force on the workpiece. When the workpiece rotates, the workpiece will drive the clamping cylinder 610, the drive ring 410 and the guide member 530 to rotate together. The guide member 530 and the telescopic member 510 are rotatably connected through the abutment member 520, so that the cooperation of the drive ring 410 and the clamping cylinder 610 to clamp the workpiece will not interfere with the rotation of the drive ring 410 and the clamping cylinder 610.

[0062] Reference Figure 6 and Figure 7 An angle positioning assembly 700 is also provided on the outside of the clamp 610. The angle positioning assembly 700 includes a rotating component 710, magnets 720, and Hall sensors 730. There are four Hall sensors 730, which are evenly distributed in a ring on the inner wall of the clamping hole 311. Multiple magnets 720 are provided, and the magnetic forces of these magnets are different. These magnets 720 are evenly distributed in a ring on the outside of the clamp 610, and their positions correspond to the positions of the Hall sensors 730. When the clamp 610 rotates, the magnets 720 rotate with it. When the internal current of the Hall sensor 730 is constant, the Hall sensor 730 generates the largest voltage drop when the magnet 720 with the strongest magnetic force passes through it. At this point, a specific angle between the magnet 720 with the strongest magnetic force and the clamp 610 is marked as the initial angle. Subsequently, the clamp angle can be calculated by detecting the maximum voltage drop inside different Hall sensors 730. The rotation angle of clamp 610 is determined by the following process: after the magnet 720 with the strongest magnetic force passes one of the Hall sensors 730, the magnet 720 with the weakest magnetic force will then pass the same Hall sensor 730. Whenever the magnet 720 and the Hall sensor 730 are closest, the voltage drop inside the Hall sensor 730 will reach its peak value. The voltage corresponding to the peak value is the maximum magnetic force of the magnet 720 at that time. By calculating the maximum magnetic force, it can be determined which magnet 720 on clamp 610 has passed. By calculating the peak voltages of multiple Hall sensors 730, the rotation angle of clamp 610 can be calculated more accurately. The rotating component 600 uses a stepper motor, which is mounted on the turntable 310 via a mounting bracket. The stepper motor is connected to clamp 610 via a gear set. When the stepper motor drives clamp 610 to rotate, the rotation angle of clamp 610 can be accurately calculated by the cooperation of magnet 720 and Hall sensor 730.

[0063] The implementation principle of a slant bed multi-station composite CNC machining center according to an embodiment of the present invention is as follows: The first spindle 110 and the second spindle 120 can simultaneously machine one end of a workpiece. When machining the other end of the workpiece is required, the workpiece rotation mechanism 200 drives the workpieces on the first spindle 110 and the second spindle 120 respectively, and swaps the positions of the workpieces on the first spindle 110 and the second spindle 120, so that the first spindle 110 and the second spindle 120 respectively clamp the other end of the workpiece, thereby machining the other end of the workpiece; simultaneously machining the long... When machining shaft-type workpieces, a workpiece clamping structure can be used to clamp the suspended end of the workpiece. This provides static support during milling and rolling support during turning, thereby reducing workpiece sway and improving machining accuracy. When the workpiece is moved from the first spindle 110 to the second spindle 120 and the rotation angle of the workpiece needs to be adjusted, the angle positioning component 700 can control the workpiece to rotate at a specific angle, eliminating the need to use the first spindle 110 or the second spindle 120 to control the workpiece rotation, thus improving the machining efficiency of the workpiece.

[0064] In summary, this application achieves automatic workpiece position switching between the first spindle 110 and the second spindle 120 by setting up a turntable 310 and a transverse plate 210. The rotation of the turntable 310 and the lateral sliding of the support frame 220 work in coordination, enabling the chuck assembly 400 to accurately grip and transfer the workpiece. Combined with the synchronous processing of the first spindle 110 and the second spindle 120, this not only eliminates manual intervention but also allows for the completion of processing at both ends of two workpieces within the same cycle, significantly improving production efficiency. The chuck assembly 400 adopts a mechanical self-locking linkage design, through synchronous driving of multiple... The 420-inch gripper rotates to achieve self-centering clamping of the workpiece. Combined with the rotational support mechanism of the clamping cylinder 610 and the clamping member 620, in long-shaft machining, the clamping member 620 can both clamp the clamping cylinder 610 to fix the workpiece and release it, allowing the clamping cylinder 610 to rotate with the workpiece. This effectively suppresses the swaying caused by the workpiece being suspended in the air, improving machining accuracy. A combination of an array of ring-shaped multi-magnets 720 with different magnetic forces and a Hall sensor 730 enables non-contact detection of the rotation angle of the clamping cylinder 610, improving the accuracy of the rotation angle recognition.

[0065] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A slant bed multi-station composite CNC machining center, comprising a slant bed (100), a first spindle (110), a second spindle (120), a first machining assembly (130), and a second machining assembly (140), wherein the first machining assembly (130) and the second machining assembly (140) are slidably disposed on the slant bed (100) along the length direction of the slant bed (100), and the first spindle (110) and the second spindle (120) are disposed opposite to each other at both ends of the slant bed (100) along the length direction of the slant bed (100), characterized in that: It also includes a workpiece moving mechanism (200), which includes a transverse plate (210), a support frame (220) and a clamping assembly (300). The transverse plate (210) is slidably disposed on the slant bed (100) along the length direction of the slant bed (100), and the support frame (220) is slidably disposed on the transverse plate (210) along the width direction of the slant bed (100); The clamping assembly (300) includes a turntable (310), a plurality of clamp assemblies (400) and a drive member (320). The drive member (320) is fixedly mounted on the support frame (220). The turntable (310) is rotatably mounted on the support frame (220). The drive member (320) is used to drive the turntable (310) to rotate on the support frame (220). The plurality of clamp assemblies (400) are evenly distributed on the edge of the turntable (310). The turntable (310) is provided with clamping holes (311). The chuck assembly (400) includes a drive ring (410), a plurality of grippers (420), and a connecting rod (430) corresponding to the grippers (420). The drive ring (410) is rotatably disposed in the clamping hole (311). The plurality of grippers (420) are evenly distributed in a ring inside the clamping hole (311). One end of the gripper (420) is rotatably connected to the inner wall of the clamping hole (311), and the other end of the gripper (420) is rotatably connected to one end of the connecting rod (430). The other end of the connecting rod (430) is rotatably connected to the drive ring (410). The drive ring (410) is driven by a power assembly (500); The chuck assembly (400) is externally provided with a rotating assembly (600), the rotating assembly (600) includes a clamping cylinder (610), a clamping member (620) and a power member (630), the clamping cylinder (610) is rotatably disposed inside the clamping hole (311), the clamping member (620) is disposed on the outer circumferential surface of the clamping cylinder (610), and the power member (630) is fixedly disposed on the turntable (310), the power member (630) is used to drive the clamping member (620) to clamp the clamping cylinder (610); The plurality of grippers (420) are rotatably mounted on the clamping cylinder (610); The drive ring (410) is provided with a spiral structure (411). The power assembly (500) includes a telescopic member (510), an abutment member (520), and a guide member (530). The guide member (530) is sleeved on the outside of the clamp (610). The guide member (530) and the clamp (610) are slidably disposed. A guide structure (531) is provided on the guide member (530). The guide structure (531) is configured to cooperate with the spiral structure (411). One end of the telescopic member (510) is fixedly disposed on the turntable (310). The other end of the telescopic member (510) is rotatably connected to the guide member (530) through the abutment member (520).

2. The slant bed multi-station composite CNC machining center according to claim 1, characterized in that: The turntable (310) is also provided with an angle positioning component (700) and a rotating component (710). The angle positioning component (700) is used to identify the rotation angle of the clamp (610). The rotating component (710) is fixedly installed on the turntable (310) and is used to drive the clamp (610) to rotate.

3. The slant bed multi-station composite CNC machining center according to claim 2, characterized in that: The angle positioning component (700) includes a magnet (720) and a Hall sensor (730). The magnet (720) is fixedly mounted on the clamp (610). Multiple Hall sensors (730) are arranged in a ring on the inner wall of the clamping hole (311). Each Hall sensor (730) is corresponding to the magnet (720).

4. A slant bed multi-station composite CNC machining center according to claim 3, characterized in that: Multiple magnets (720) are provided, and the multiple magnets (720) are evenly distributed in a ring on the clamp (610), and the magnetic force of the multiple magnets (720) is different.

5. A slant bed multi-station composite CNC machining center according to claim 1, characterized in that: The distance from the axis of the turntable (310) to the bed surface of the slant bed (100) is equal to the distance from the axis of the first spindle (110) to the bed surface of the slant bed (100), and the support frame (220) is slidably arranged along the inclination direction of the slant bed (100).

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