Inclined bed multi-station composite numerical control machining center

Abstract

The invention relates to an inclined bed multi-station composite numerical control machining center, which relates to the field of composite numerical control machine tools, and comprises an inclined bed body, a first main shaft, a second main shaft, a first machining assembly, a second machining assembly and a workpiece operating mechanism, and the first machining assembly and the second machining assembly are arranged on the inclined bed body in a sliding manner along the length direction of the inclined bed body; the first main shaft and the second main shaft are oppositely arranged at the two ends of the slant lathe bed in the length direction of the slant lathe bed. The workpiece operating mechanism comprises a transverse moving plate, a supporting frame and a clamping assembly. The transverse moving plate is slidably arranged on the inclined lathe bed in the length direction of the inclined lathe bed, the supporting frame is slidably arranged on the transverse moving plate in the width direction of the inclined lathe bed, and the clamping assembly is rotationally arranged on the supporting frame and used for clamping a workpiece on the first main shaft or the second main shaft. According to the automatic position changing device, the positions of the workpieces on the two stations can be automatically changed, manual intervention is omitted, machining of the two ends of the two workpieces can be completed in the same period, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of compound numerical control machine tools, in particular to a slant bed multi-station compound numerical control machining center. Background Art

[0002] A compound CNC machining center refers to a machine tool that integrates multiple machining functions, usually including turning, milling, drilling and other processes. It can complete multiple processes with one clamping, reduce the number of clamping times of the workpiece, and thus shorten the machining cycle. The design of the inclined bed can increase the reliability and stability of the machine tool and improve the machining accuracy. In order to improve machining efficiency, some existing CNC machining centers will set up multiple machining stations on the lathe and clamp and process multiple workpieces at the same time.

[0003] At present, a Chinese patent application with publication number CN118990017A and publication date November 22, 2024 proposes a dual-spindle sphere turning, grinding and chamfering integrated CNC machine tool, including a machine base, fixed tables are fixedly arranged at both ends of the top of the machine base, spindle boxes are fixedly arranged on the fixed tables, an inclined bed is arranged on one side of the machine base, and two sets of spindle boxes are respectively assembled and connected with a first spindle and a second spindle which are relatively arranged, servo motors are fixedly arranged on both sides of the machine base, the first spindle and the second spindle are respectively connected to the corresponding servo motors for transmission, and a group of sliding screw pairs are symmetrically arranged at both ends of the surface of the inclined bed, and tool holder plates are slidably installed on the sliding screw pairs.

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

[0005] With respect to the above-mentioned related technologies, the first tool holder plate cooperates with the first spindle, and the second tool holder plate cooperates with the second spindle to simultaneously process one end of the two workpieces. However, when both ends of the workpiece need to be processed, manual operation is required to remove the workpieces on the first spindle and the second spindle, and manually change the direction of the workpiece before processing the other end of the workpiece, which affects production efficiency. Summary of the invention

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

[0007] The present invention provides a slant bed multi-station composite CNC machining center, which adopts the following technical solution: An inclined bed multi-station composite CNC machining center, comprising an inclined bed, a first spindle, a second spindle, a first machining component and a second machining component. The first machining component and the second machining component are both slidably arranged on the inclined bed along the length direction of the inclined bed. The first spindle and the second spindle are oppositely arranged at both ends of the inclined bed along the length direction of the inclined bed. It further includes a workpiece transfer mechanism, and the workpiece transfer mechanism includes a transverse moving plate, a support frame and a clamping component. The transverse moving plate is slidably arranged on the inclined bed along the length direction of the inclined bed. The support frame is slidably arranged on the transverse moving plate along the width direction of the inclined bed. The clamping component includes a turntable, a plurality of chuck components and a driving member. The driving member is fixedly arranged on the support frame. The turntable is rotatably arranged on the support frame. The driving member is used to drive the turntable to rotate on the support frame. A plurality of the chuck components are evenly distributed on the edge of the turntable.

[0008] By adopting the above technical solution, when machining shaft-like workpieces, two workpieces are respectively clamped on the first spindle and the second spindle. Secondly, the first machining component is used to machine the workpiece on the first spindle, and the second machining component is used to machine the workpiece on the second spindle. When one end of the workpieces on the first spindle and the second spindle is machined, first, the turntable in the workpiece transfer mechanism rotates under the control of the driving member, and at the same time, the support frame slides on the transverse moving plate, so that the chuck component on the turntable is in a position corresponding to the workpiece on the first spindle. Secondly, the transverse moving plate slides along the length direction of the machine tool, so that the chuck component moves to a position corresponding to the workpiece on the first spindle. Subsequently, the chuck component clamps the workpiece on the first spindle, and the first spindle releases the workpiece. Again, the driving member controls the turntable to rotate, so that another chuck component on the turntable corresponds to the workpiece on the second spindle, and at the same time, the transverse moving plate is controlled to move towards the second spindle, so that another chuck clamps the workpiece on the second spindle. After removing the workpiece on the second spindle, the turntable rotates again and cooperates with the sliding of the transverse moving plate to install the workpiece removed from the first spindle into the second spindle, and install the workpiece removed from the second spindle into the first spindle.

[0009] Thus, after the workpiece machining at the first main spindle station and the second main spindle station is completed, through the workpiece transfer mechanism, the workpieces clamped on the first main spindle and the second main spindle can be swapped, and the other ends of the workpieces can be machined respectively, without manually swapping the workpieces on the first main spindle and the second main spindle, enabling the two stations to machine two workpieces simultaneously and also enabling machining of both ends of the workpiece; at the same time, the blank can be fixed in advance on other chuck assemblies of the workpiece clamping structure, so that after the workpieces on the first main spindle and the second main spindle are machined, automatic feeding can be carried out through the workpiece transfer mechanism, improving the feeding efficiency; when machining a long shaft workpiece, the chuck assembly can also be used to clamp the suspended end of the workpiece and control the chuck assembly to move near the workpiece machining area, so that the suspended part of the workpiece can be supported by the chuck assembly, improving the stability during workpiece machining and thus improving the machining accuracy of the workpiece.

[0010] Optionally, a clamping hole is provided on the turntable; the chuck assembly includes a driving ring, a plurality of jaws and connecting rods corresponding to the jaws. The driving ring is rotatably arranged in the clamping hole. The plurality of 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, the other end of the jaw is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the driving ring; the driving ring is driven by a power assembly.

[0011] By adopting the above technical solution, the jaws can rotate inside the clamping hole around the end connected to the inner wall of the clamping hole; when the driving ring rotates inside the clamping hole, the driving ring will drive the end of the connecting rod connected to the driving ring to rotate, causing the connecting rod to rotate relative to the rotating ring. The other end of the connecting rod is rotatably connected to the jaw, so that when the connecting rod rotates, the end of the connecting rod connected to the jaw will abut against the jaw, causing the end of the jaw connected to the connecting rod to move towards the position close to the center of the clamping hole, and the ends of the jaws evenly distributed in a ring inside the clamping hole all move towards the position of the center of the clamping hole, enabling the plurality of jaws to clamp the workpiece inside the clamping hole; at the same time, since the jaws are evenly distributed in a ring inside the clamping hole and the driving ring drives a plurality of jaws simultaneously through a plurality of connecting rods, the jaws will rotate synchronously when clamping the workpiece, thus playing a self-centering role when clamping the workpiece and clamping the workpiece at the axis center of the clamping hole.

[0012] Thus, by synchronously driving a plurality of jaws for clamping through the driving ring and a plurality of connecting rods, the plurality of jaws can rotate synchronously when clamping the workpiece, realizing self-centering when the chuck assembly clamps the workpiece; when the chuck assembly clamps the workpiece, the chuck assembly will limit the workpiece to be fixed at the current angle, reducing the torsion of the workpiece angle when the workpiece transfer mechanism swaps the position of the workpiece between the first main spindle and the second main spindle, and thus improving the accuracy of the slot positions at both ends of the workpiece when milling slots on the side surfaces of both ends of the workpiece.

[0013] Optionally, a rotating assembly is provided outside the chuck assembly. The rotating assembly includes a clamping cylinder, a pressing member, and a power member. The clamping cylinder is rotatably arranged inside the clamping hole. The pressing member is arranged on the outer peripheral surface of the clamping cylinder. The power member is fixedly arranged on the turntable. The power member is used to drive the pressing member to clamp the clamping cylinder. A plurality of the clamping jaws are all rotatably arranged on the clamping cylinder.

[0014] When machining a long-axis workpiece, when one end of the workpiece is clamped on the first main shaft or the second main shaft for machining, the other end of the workpiece is in a suspended state. The suspended end of the workpiece is not supported. Especially during the rotation of the workpiece, the suspended end of the workpiece will swing, resulting in a reduction in the machining accuracy of the workpiece.

[0015] By adopting the above technical solution, when the power member drives the pressing member to press against the outer peripheral surface of the clamping cylinder, the frictional force between the pressing member and the clamping cylinder fixes the clamping cylinder inside the clamping hole. At this time, the rotation ring and the clamping cylinder rotate, and the workpiece can be fixedly clamped by the clamping jaws. When machining a long-axis workpiece, one end of the workpiece is clamped and fixed on the first main shaft, and the other end of the workpiece is fixed inside the clamping cylinder by the clamping jaws in the clamping cylinder. Subsequently, the pressing member releases the clamping cylinder, and the workpiece can drive the clamping cylinder to rotate inside the clamping hole, so that when machining the workpiece, both ends of the workpiece can be stably supported, improving the machining accuracy of the workpiece. When it is necessary to fix the workpiece, after the clamping jaws clamp the workpiece inside the clamping cylinder, the pressing member fixes the clamping cylinder to restrict the rotation of the workpiece.

[0016] In this way, by providing the clamping cylinder and the pressing member, when machining a long-axis workpiece, the chuck assembly can be controlled to clamp and fix the workpiece inside the clamping cylinder, and the rotation of the clamping cylinder can be restricted in cooperation with the pressing member. When machining the workpiece, the end of the workpiece can be supported or rotatably supported, reducing the swing generated when the workpiece is suspended, and improving the machining accuracy of the workpiece.

[0017] Optionally, a spiral structure is provided on the driving ring. The power assembly includes a telescopic member, a abutting member, and a guiding member. The guiding member is sleeved outside the clamping cylinder. The guiding member and the clamping cylinder are slidably arranged. A guiding structure is provided on the guiding member. The guiding structure is cooperatively arranged with the spiral structure. One end of the telescopic member is fixedly arranged on the turntable. The other end of the telescopic member is rotationally connected to the guiding member through the abutting member.

[0018] When the clamping cylinder rotates to support the workpiece, the workpiece will drive the clamping cylinder to rotate. After the power assembly that controls the relative rotation between the driving ring and the clamping cylinder clamps the workpiece, it is necessary to always maintain the relative static state between the driving ring and the clamping cylinder in order to provide sufficient clamping force for the workpiece. However, fixedly setting the power assembly on the clamping cylinder will affect the dynamic balance of the clamping cylinder, affect the stability during the rotation of the clamping cylinder, and lead to a decrease in the machining accuracy of the workpiece.

[0019] By adopting the above technical solution, when the telescopic member extends, the telescopic member will drive the abutting member and the guiding member to slide relative to the outer peripheral surface of the clamping cylinder. Since the distance between the driving ring and the clamping cylinder is fixedly set, relative sliding will occur between the guiding member and the driving ring. When the guiding member and the driving ring slide relative to each other, the guiding structure on the guiding member will cooperate with the spiral structure on the driving ring, enabling the driving ring to rotate relative to the clamping cylinder as the guiding member moves. When the driving ring rotates relative to the clamping cylinder, it can control the clamping jaws to clamp. After the driving ring rotates to the corresponding position and clamps the workpiece, the telescopic member is locked in the current position to keep the clamping jaws with the corresponding clamping force; when the clamping jaws clamp the workpiece and rotate with the workpiece, the positional relationship among the driving ring, the guiding member, and the clamping cylinder is relatively fixed, and the guiding member is rotatably connected to the telescopic member through the abutting member, so that when the workpiece drives the clamping cylinder to rotate, the driving ring and the guiding member will rotate together with the workpiece.

[0020] In this way, by setting the telescopic member and the guiding member, and matching the guiding structure on the guiding member with the spiral structure on the driving ring, the telescopic movement of the telescopic member is converted into the rotational movement of the driving ring, and the telescopic member and the guiding member are rotatably connected through the abutting member, enabling the guiding member to rotate together with the driving ring while restricting the rotation of the driving ring. There is no need to install the power assembly on the clamping cylinder, reducing the impact on stability during the rotation of the clamping cylinder, and further reducing the impact on the machining accuracy of the workpiece.

[0021] Optionally, an angle positioning assembly and a rotating member are further provided on the turntable. The angle positioning assembly is used to identify the rotation angle of the clamping cylinder, and the rotating member is fixedly arranged on the turntable and is used to drive the clamping cylinder to rotate.

[0022] When milling slots at both ends of a shaft workpiece, if the positions of the slots milled at both ends of the workpiece do not correspond, when moving the workpiece from the first main shaft to the second main shaft, it is necessary to rotate the workpiece and adjust the angle of the workpiece to control the position of the milled slot. By adopting the above technical solution, after the workpiece is removed from the first main shaft and clamped and fixed inside the clamping cylinder, the rotating member controls the clamping cylinder to drive the workpiece to rotate, and the angle positioning assembly monitors the rotation angle of the clamping cylinder in real time, so that after the workpiece is moved from the first main shaft to the second main shaft, the workpiece has rotated to the corresponding angle, and then the second main shaft can directly clamp the workpiece to mill the slot on the side of the workpiece.

[0023] In this way, by setting the rotating member and the angle positioning component, after the workpiece is fixed inside the chuck, the rotation of the workpiece can be controlled by a specific angle, so that the machining can start without adjusting the rotation after the workpiece is fixed on the first main shaft or the second main shaft, improving the machining efficiency of the workpiece. At the same time, when machining a long shaft workpiece, the rotating member can also drive the chuck and the main shaft to rotate synchronously, so that both ends of the long shaft workpiece rotate synchronously, reducing the torque on the long shaft workpiece when one end of the long shaft workpiece rotates actively through the main shaft and drives the other end to rotate, thereby reducing the stress concentrated inside the long shaft workpiece and reducing the probability of deformation of the workpiece, while reducing the impact on the performance of the workpiece.

[0024] Optionally, the angle positioning component includes a magnet and a Hall sensor. The magnet is fixedly arranged on the chuck, and a plurality of Hall sensors are provided. The plurality of Hall sensors are annularly and evenly distributed on the inner wall of the clamping hole, and the plurality of Hall sensors are correspondingly arranged with the magnet.

[0025] 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 voltages of Hall sensors at different positions, the position of the magnet can be judged, and then the rotation angle of the chuck can be calculated.

[0026] In this way, by cooperating the magnet with the first sensor, during use, the magnet and the first sensor do not need to be in direct contact, which can reduce the influence on the rotation of the chuck. At the same time, the rotation angle of the chuck can be detected by using the Hall effect. Furthermore, during the machining of the workpiece, the rotation angle of the workpiece can be detected in real time. When the rotating member drives the chuck to rotate, the Hall sensor can accurately identify the rotation angle of the workpiece and control the rotation of the chuck through the rotating member, thereby controlling the rotation angle of the workpiece. Furthermore, when milling a groove on the side of a shaft workpiece, the milling groove angle can be accurately controlled.

[0027] Optionally, a plurality of magnets are provided. The plurality of magnets are annularly and evenly distributed on the chuck, and the magnetic forces of the plurality of magnets are different.

[0028] When only one magnet is provided, if the position of the magnet is relatively far from the positions of all Hall sensors, the magnetic field at the position where the Hall sensors are located will be weak, resulting in inaccurate identification of the rotation angle of the clamping cylinder by the cooperation between the Hall sensors and the magnet. By adopting the above technical solution, when multiple magnets are provided, at any angle of rotation of the clamping cylinder, there will be a magnet close to the position of one of the Hall sensors, enabling the Hall sensors to be magnetized more precisely, and thus being able to identify the rotation angle of the clamping cylinder more accurately. And setting the magnetic forces of the multiple magnets to be different is to make the peak voltage drops generated by the Hall sensors different when different magnets rotate to the position closest to one of the Hall sensors, so as to distinguish the positions of the magnets at different positions and calculate the rotation angle of the clamping cylinder more precisely.

[0029] In this way, using multiple different magnets in cooperation with the Hall sensors for detection can not only increase the sensitivity of the Hall sensor detection, improve the recognition accuracy of the rotation angle of the clamping cylinder, but also play a role of multiple verifications, reducing the probability of failure of the Hall sensor not being detected in time; at the same time, setting multiple magnets can also play a backup role. When one of the magnets is damaged, other magnets are used in cooperation with the Hall sensors to calculate the rotation angle of the clamping cylinder.

[0030] Optionally, the distance from the axis of the turntable to the bed surface of the inclined bed is equal to the distance from the axis of the first main shaft to the bed surface of the inclined bed, and the support frame is slidably arranged along the inclined direction of the inclined bed.

[0031] By adopting the above technical solution, since the distances from the axes of the turntable and the first main shaft to the bed surface of the inclined bed are the same, when adjusting the coaxiality of the clamping hole and the first main shaft, by setting the connection line between the clamping hole and the turntable to be perpendicular to the perpendicular line between the turntable and the bed surface of the inclined bed, the distances from the axes of the clamping hole and the first main shaft to the bed surface of the inclined bed can be made the same. Subsequently, adjusting the support frame to slide along the transverse plate can control the coaxiality of the clamping hole and the first main shaft. In this way, by arranging the support frame and the turntable in cooperation with the inclined direction of the inclined bed, when adjusting the coaxiality of the clamping hole and the first main shaft, the adjustment method is more convenient.

[0032] In summary, the present invention includes at least one of the following beneficial technical effects: Through the linkage design of the turntable and the transverse plate, the automatic position swapping and rotation angle control of the workpiece between the first main shaft and the second main shaft are realized; the rotation of the turntable and the transverse sliding of the support frame cooperate with each other, enabling the chuck assembly to accurately grasp and transfer the workpiece, and cooperating with the synchronous machining of the first main shaft and the second main shaft, which not only eliminates manual intervention, but also can complete the machining of both ends of two workpieces within the same cycle, significantly improving the production efficiency.

[0033] The chuck assembly adopts a mechanical self-locking linkage design of a drive ring - connecting rod - jaw. By synchronously driving multiple jaws to rotate, it can achieve self-centering clamping of the workpiece. Cooperating with the rotational support mechanism of the collet and the abutting member, during long-axis machining, the workpiece can be fixed by clamping the collet with the abutting member, or the abutting member can be loosened to allow the collet to rotate with the workpiece, effectively suppressing the swing generated in the suspended state of the workpiece and improving the machining accuracy.

[0034] By combining an annular multi-magnet array with different magnetic forces and Hall sensors, non-contact detection of the rotation angle of the collet is achieved. The layout of the multi-magnets not only improves the resolution of the rotation angle of the collet but also increases the ability to handle special situations and enhances the reliability of the positioning of the rotation angle of the collet through magnetic force differences and the setting of multiple Hall sensors. Brief Description of the Drawings

[0035] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention; Figure 2 is the overall structural schematic diagram of the workpiece operation mechanism in the embodiment of the present invention; Figure 3 is the front structural schematic diagram of the workpiece operation mechanism in the embodiment of the present invention; Figure 4 is Figure 3 the partial enlarged schematic diagram of part A in Figure 5 is Figure 4 the sectional view taken along A - A in Figure 6 is Figure 5 the sectional view taken along B - B in Figure 7 is the exploded structural schematic diagram of the chuck assembly of the embodiment of the present invention.

[0036] Explanation of Reference Numerals: 100, inclined bed; 110, first main shaft; 120, second main shaft; 130, first machining assembly; 140, second machining assembly; 200, workpiece operation mechanism; 210, cross - slide plate; 220, support frame; 300, clamping assembly; 310, turntable; 311, clamping hole; 320, driving member; 400, chuck assembly; 410, drive ring; 411, spiral structure; 420, jaw; 430, connecting rod; 500, power assembly; 510, telescopic member; 520, abutting member; 530, guiding member; 531, guiding structure; 600, rotating assembly; 610, collet; 620, abutting member; 630, power member; 700, angle positioning assembly; 710, rotating member; 720, magnet; 730, Hall sensor. Detailed Embodiment

[0037] The following Figures 1 to 7 further elaborates on the present invention in detail.

[0038] An embodiment of the present invention discloses an inclined bed multi-station composite CNC machining center. Referring to Figures 1 to 3 , an inclined bed multi-station composite CNC machining center mainly includes an inclined bed 100, a first spindle 110 and a second spindle 120 oppositely arranged at both ends of the inclined bed 100, a first machining component 130 installed on the inclined bed 100 and corresponding to the first spindle 110, a second machining component 140 installed on the inclined bed 100 and corresponding to the second spindle 120, and a workpiece clamping component 300 installed on the inclined bed 100; when machining shaft-like workpieces, two workpieces can be respectively clamped on the first spindle 110 and the second spindle 120, and then the first machining component 130 is used to machine the workpiece on the first spindle 110, and the second machining component 140 is used to machine the workpiece on the second spindle 120. When machining the other end of the shaft-like workpiece, the workpiece clamping component 300 can be used to swap the positions of the workpiece on the first spindle 110 and the workpiece on the second spindle 120 to machine the other end of the shaft-like workpiece. Without manual intervention, both ends of the shaft-like workpiece can be machined, and two workpieces can be machined simultaneously, significantly improving the machining efficiency of the workpiece.

[0039] Referring to Figure 1 , the inclined bed 100 is an overall inclined bed body, the bed surface forms a 45-degree angle with the horizontal plane, and high-precision guide rails are arranged on both sides of the bed surface. A workpiece machining space is reserved in the middle of the inclined bed 100; the first spindle 110 and the second spindle 120 are respectively fixed at both ends of the inclined bed 100, and the first spindle 110 and the second spindle 120 are oppositely arranged. The axes of the first spindle 110 and the second spindle 120 are collinear and parallel to the bed surface. Standard chucks are equipped at the opposite ends of the first spindle 110 and the second spindle 120 for clamping workpieces; the first machining component 130 and the second machining component 140 are respectively arranged on the high-precision guide rails on the bed surface. The high-precision guide rails are arranged along the length direction of the inclined bed 100. Both the first machining component 130 and the second machining component 140 include an independent turret and a cross slide for controlling the movement of the turret. The cross slide is slidably arranged on the high-precision guide rails and is driven by the high-precision guide rails to move along the length direction of the inclined bed 100. The turret slides on the cross slide along the inclination direction of the bed surface of the inclined bed 100. The turret is equipped with a multi-station tool magazine and can perform machining processes such as turning, drilling, and milling slots.

[0040] In this embodiment, both the first machining component 130 and the second machining component 140 are matched with the X-axis and Z-axis slides. Among them, the X-axis slide is fixedly arranged on the bed surface of the inclined bed 100 and is matched with the high-precision guide rails to drive the cross slide to move along the length direction of the inclined bed 100. The Z-axis slide is fixedly arranged on the cross slide. The Z-axis slide is used to drive the turret to slide along the inclination direction of the bed surface of the inclined bed 100. Both the Z-axis slide and the Z-axis slide are driven by ball screws.

[0041] When machining shaft-like workpieces, the two workpieces are respectively clamped on the first main shaft 110 and the second main shaft 120, and the first machining component 130 is used to machine the workpiece on the first main shaft 110, and the second machining component 140 is used to machine the workpiece on the second main shaft 120.

[0042] Refer to Figure 1 , a slide rail for controlling the movement of the workpiece operating mechanism 200 is arranged at the position of the reserved space in the middle of the inclined bed 100. The slide rail is arranged along the length direction of the machine tool and is parallel to the high-precision guide rail, so that after the workpiece operating mechanism 200 is installed on the slide rail, it can move along the length direction of the machine tool.

[0043] Refer to Figure 2 and Figure 3 , the workpiece operating mechanism 200 includes a cross-moving plate 210, a support frame 220 and a clamping component 300. The cross-moving plate 210 is installed on the slide rail of the inclined bed 100 and is driven by a ball screw to slide the cross-moving plate 210 along the length direction of the inclined bed 100. The support frame 220 is slidably arranged on the cross-moving plate 210, and a ball screw is arranged on the cross-moving plate 210 to drive the support frame 220 to slide on the cross-moving plate 210 along the inclined direction of the inclined bed 100 bed surface. The clamping component 300 is installed on the support frame 220 to clamp the workpiece on the main shaft.

[0044] In order to facilitate the adjustment of the clamping component 300 corresponding to the first main shaft 110 and the second main shaft 120, the cross-moving plate 210 is arranged along the inclined direction of the inclined bed 100, so that when the support frame 220 slides on the cross-moving plate 210, the sliding direction of the support frame 220 is consistent with the inclined direction of the inclined bed 100 bed surface.

[0045] Refer to Figure 3 and Figure 4 , the clamping component 300 includes a turntable 310, a driving member 320 and a chuck assembly 400. The turntable 310 has a cross-shaped structure. A connecting shaft is arranged in the middle of the turntable 310. The turntable 310 is rotatably installed on the support frame 220 through the connecting shaft in the middle. The driving member 320 uses a motor. The driving member 320 is fixedly installed on the support frame 220, and the driving member 320 is rotationally connected to the connecting shaft in the middle of the turntable 310 through a gear set, so that the driving member 320 can drive the turntable 310 to rotate around the connecting shaft in the middle. The turntable 310 extends out four evenly distributed extension arms from the middle to form a cross-shaped structure. A clamping hole 311 is arranged on each extension arm. 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 arranged on the extension arm from the inclined bed surface is the same as the height of the first main shaft 110 from the inclined bed 100 bed surface.

[0046] When the chuck assembly 400 clamps the workpiece on the first main shaft 110 or the second main shaft 120, only one of the extension arms of the turntable 310 needs to be adjusted to be perpendicular to the support frame 220, and then by adjusting the sliding of the support frame 220 on the transverse movement plate 210, the chuck assembly 400 can be aligned with the first main shaft 110 or the second main shaft 120, which is convenient for clamping the workpiece on the first main shaft 110 or the second main shaft 120.

[0047] Refer to Figure 5 and Figure 6 , a chuck assembly 400 and a rotating assembly 600 are arranged inside the clamping hole 311. The chuck assembly 400 is installed on the rotating assembly 600 so that the chuck assembly 400 can rotate along with the clamping cylinder 610. When machining a long shaft workpiece, it is convenient to rotate and clamp the workpiece at the end of the workpiece, providing more stable support for the workpiece.

[0048] Refer to Figure 6 , the rotating assembly 600 includes a clamping cylinder 610, a pressing member 620 and a power member 630. The clamping cylinder 610 is rotatably arranged inside the clamping hole 311, and both ends of the clamping cylinder 610 are restricted in position in the clamping hole 311 by flange plates. The pressing member 620 is arranged outside the clamping cylinder 610, and a relief groove is arranged inside the clamping hole 311. One end of the pressing member 620 is provided with a round hole and is rotatably connected in the relief groove through a pin shaft and a torsion spring. The power member 630 is a jacking cylinder, and the piston rod of the jacking cylinder abuts against one end of the pressing member 620 away from the pin shaft; when the jacking cylinder extends, it will press the pressing member 620 against the outer peripheral surface of the clamping cylinder 610 to restrict the rotation of the clamping cylinder 610, which is applicable to the situation where the workpiece running mechanism 200 statically supports the workpiece; when the jacking cylinder shortens, the pressing member 620 disengages from the outer surface of the clamping cylinder 610 under the action of the torsion spring, enabling the clamping cylinder 610 and the chuck assembly 400 installed inside the clamping cylinder 610 to rotate, which is applicable to the situation where the workpiece needs to be rotationally supported.

[0049] Refer to Figure 4, the collet assembly 400 includes a drive ring 410, a plurality of connecting rods 430, and collets 420 provided in one-to-one correspondence with the connecting rods 430. The drive ring 410 is sleeved on the outer peripheral surface of the collet cylinder 610 and the drive ring 410 is provided at one end of the collet cylinder 610. One end of each of the plurality of collets 420 is rotatably provided on the collet cylinder 610. One end of the connecting rod 430 is provided at the other end of the collet 420. The other end of the connecting rod 430 is rotatably provided on the drive ring 410. The plurality of connecting rods 430 and the plurality of collets 420 are both annularly distributed. When the collet cylinder 610 is fixed under the restriction of the pressing member 620, the position of the end of the collet 420 connected to the collet cylinder 610 is fixed. At this time, the rotation of the drive ring 410 will drive the connecting rod 430 to rotate and displace. Since one end of the connecting rod 430 is rotatably connected to the collet 420, and the position of the end of the collet 420 connected to the collet cylinder 610 remains unchanged, relative rotation will occur between the connecting rod 430 and the collet 420, so that under the push of the drive ring 410, the ends of the connecting rod 430 and the collet 420 connected thereto will rotate toward the axis position of the collet cylinder 610. In this embodiment, the number of the connecting rods 430 and the collets 420 is both set to three. When the three collets 420 rotate toward the axis position of the collet cylinder 610 at the same time, the workpiece in the middle of the collet cylinder 610 can be clamped, and the workpiece is pushed to the axis position of the collet cylinder 610 under the cooperation of the three collets 420 to clamp the workpiece, realizing the self-centering function.

[0050] In order to increase the clamping force of the collet 420, optimize the support force distribution of the collet 420 and reduce the interference between components, in this embodiment, both the collet 420 and the connecting rod 430 adopt an arc design.

[0051] Referring to Figure 5 and Figure 7, the rotation of the driving ring 410 is driven by a power assembly 500. The power assembly 500 includes a telescopic member 510, an abutting member 520, and a guiding member 530. The guiding member 530 is disposed between the outer walls of the driving ring 410 and the clamping cylinder 610. Specifically, a sandwich layer is provided between the driving ring 410 and the clamping cylinder 610. The guiding member 530 is in an annular structure and is disposed in the sandwich layer, such that the inner peripheral surface of the guiding member 530 contacts the outer peripheral surface of the clamping cylinder 610. A corresponding slide rail and a chute are provided between the guiding member 530 and the clamping cylinder 610. The slide rail is disposed on the inner peripheral surface of the guiding member 530 along the axial direction of the guiding member 530, and the chute is disposed on the outer peripheral surface of the clamping cylinder along the axial direction of the clamping cylinder 610. Moreover, the slide rail is slidably disposed in the chute to move, such that the guiding member 530 can only slide along the axial direction of the clamping cylinder 610. The outer peripheral surface of the guiding member 530 contacts the inner peripheral surface of the driving ring 410. A guiding structure 531 is provided on the outer peripheral surface of the guiding member 530, and a spiral structure 411 is provided on the corresponding inner peripheral surface of the driving ring 410. The guiding structure 531 is a semi-circular groove opened on the outer peripheral surface of the guiding member 530, and balls are provided inside the semi-circular groove of the guiding structure 531. The spiral structure 411 provided on the inner peripheral surface of the driving ring 410 corresponds to the guiding structure 531, such that when the guiding member 530 undergoes a relative displacement along the axial direction of the driving ring 410 with respect to the driving ring 410, the balls roll in the spiral structure 411 and the guiding structure 531. The guiding member 530 can control the driving ring 410 to rotate through the guiding structure 531 and the spiral structure 411, and the movement of the guiding member 530 is controlled by the telescopic member 510; in this embodiment, the telescopic member 510 adopts a cylinder, such that the clamping force on the workpiece can be adaptively adjusted by setting the air pressure of the cylinder. Three telescopic members 510 are evenly distributed in a ring shape. One end of the telescopic member 510 is fixedly disposed on the flange plate at the end of the clamping hole 311, and the other end is connected to the abutting member 520. The abutting member 520 adopts a thrust bearing. One end of the thrust bearing is fixedly connected to the telescopic member 510, and the other end is fixedly connected to the guiding member 530, such that when the telescopic member 510 expands and contracts, it can drive the guiding member 530 to move. When the clamping cylinder 610 rotates, the clamping cylinder 610 will drive the driving ring 410 and the guiding member 530 to rotate together.

[0052] When the telescopic member 510 extends, the guiding member 530 moves in the direction close to the driving ring 410 under the drive of the telescopic member 510, such that the driving ring 410 rotates clockwise, and drives the connecting rod 430 and the clamping jaw 420 to displace to clamp the workpiece. Subsequently, the telescopic member 510 is fixed at the current position, and the positions of the driving ring 410 and the clamping cylinder 610 are locked to maintain the clamping force on the workpiece. Secondly, when the workpiece rotates, the workpiece will drive the clamping cylinder 610, the driving ring 410, and the guiding member 530 to rotate together. The guiding member 530 and the telescopic member 510 are rotatably connected through the abutting member 520, such that the cooperation between the driving ring 410 and the clamping cylinder 610 to clamp the workpiece will not affect the rotation of the driving ring 410 and the clamping cylinder 610.

[0053] Reference Figure 6 and Figure 7 , an angle positioning assembly 700 is also provided on the outside of the clamp 610, wherein the angle positioning assembly 700 includes a rotating part 710, a magnet 720 and a Hall sensor 730, wherein there are four Hall sensors 730, and the four Hall sensors 730 are evenly distributed in a ring shape on the inner wall of the clamping hole 311, a plurality of magnets 720 are provided, and the magnetic forces of the plurality of magnets 720 are different, and the plurality of magnets 720 are evenly distributed in a ring shape on the outside of the clamp 610, and the positions of the magnets 720 correspond to the positions of the Hall sensors 730. When the clamp 610 rotates, the magnet 720 will rotate with the clamp 610. When the current inside the Hall sensor 730 is constant, when the magnet 720 with the largest magnetic force passes through the Hall sensor 730, the pressure drop generated by the Hall sensor 730 is the largest. At this time, the specific angle between the magnet 720 with the largest magnetic force and the clamp 610 is marked as the initial angle, and then the maximum pressure drop inside different Hall sensors 730 can be calculated. 610's rotation angle, after the magnet 720 with the largest magnetic force passes through one of the Hall sensors 730, the magnet 720 with the smaller magnetic force will then pass through this Hall sensor 730. Whenever the magnet 720 is closest to the Hall sensor 730, the internal voltage drop of the Hall sensor 730 will reach a peak value, and the voltage corresponding to the peak value is the current maximum magnetic force of the magnet 720. By calculating the current maximum magnetic force, it is possible to determine which magnet 720 on the chuck 610 is currently passing by, and by calculating the peak voltages of multiple Hall sensors 730, the rotation angle of the chuck 610 can be calculated more accurately. The rotating component 600 uses a stepper motor, and the stepper motor is arranged on the turntable 310 through a mounting frame, and the stepper motor is connected to the chuck 610 through a gear set. When the stepper motor drives the chuck 610 to rotate, the rotation angle of the chuck 610 can be accurately calculated through the cooperation of the magnet 720 and the Hall sensor 730.

[0054] The implementation principle of a slant-bed multi-station composite CNC machining center in 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 respectively. When it is necessary to machine the other end of the workpiece, the workpiece running mechanism 200 is used to drive the workpieces on the first spindle 110 and the second spindle 120 respectively, and the positions of the workpieces on the first spindle 110 and the second spindle 120 are swapped, so that the first spindle 110 and the second spindle 120 clamp the other end of the workpiece respectively, and then machine the other end of the workpiece; when machining a long-axis workpiece, the workpiece clamping structure can also be used to clamp the suspended end of the workpiece, providing static support when milling the workpiece and providing rolling support when turning the workpiece, thereby reducing the swing of the workpiece and improving the machining accuracy; when adjusting the rotation angle of the workpiece during the process of moving the workpiece from the first spindle 110 to the second spindle 120, the angle positioning component 700 can also be used to control the workpiece to rotate a specific angle, without using the first spindle 110 or the second spindle 120 to control the rotation of the workpiece, improving the machining efficiency of the workpiece.

[0055] In summary, in this application, the automatic swapping of the positions of the workpieces between the first spindle 110 and the second spindle 120 is realized by setting the turntable 310 and the cross-slide plate 210. The rotation of the turntable 310 and the lateral sliding of the support frame 220 cooperate with each other, enabling the chuck assembly 400 to accurately grasp and transfer the workpiece. Combined with the synchronous machining of the first spindle 110 and the second spindle 120, it not only eliminates manual intervention but also can complete the machining of both ends of two workpieces within the same cycle, significantly improving the production efficiency; the chuck assembly 400 adopts a mechanical self-locking linkage design, and by synchronously driving the rotation of multiple jaws 420, self-centering clamping of the workpiece can be achieved; combined with the rotation support mechanism of the collet 610 and the pressing member 620, in long-axis machining, the workpiece can be fixed by clamping the collet 610 with the pressing member 620, or the pressing member 620 can be loosened to enable the collet 610 to rotate with the workpiece, effectively suppressing the swing generated in the suspended state of the workpiece and improving the machining accuracy; the combination of the annular multi-magnet 720 array with different magnetic forces and the Hall sensor 730 is set to realize the non-contact detection of the rotation angle of the collet 610, improving the accuracy of identifying the rotation angle of the collet 610.

[0056] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An inclined-bed multi-station composite CNC machining center, comprising an inclined bed (100), a first spindle (110), a second spindle (120), a first machining component (130) and a second machining component (140). The first machining component (130) and the second machining component (140) are both slidably arranged on the inclined bed (100) along the length direction of the inclined bed (100). The first spindle (110) and the second spindle (120) are oppositely arranged at both ends of the inclined bed (100) along the length direction of the inclined bed (100). It is characterized in that: It further comprises a workpiece transfer mechanism (200), and the workpiece transfer mechanism (200) comprises a transverse movement plate (210), a support frame (220) and a clamping component (300); The transverse movement plate (210) is slidably arranged on the inclined bed (100) along the length direction of the inclined bed (100), and the support frame (220) is slidably arranged on the transverse movement plate (210) along the width direction of the inclined bed (100); The clamping component (300) comprises a turntable (310), a plurality of chuck components (400) and a driving member (320). The driving member (320) is fixedly arranged on the support frame (220), the turntable (310) is rotatably arranged on the support frame (220), the driving member (320) is used for driving the turntable (310) to rotate on the support frame (220), and a plurality of the chuck components (400) are evenly distributed on the edge of the turntable (310).

2. The inclined-bed multi-station composite CNC machining center according to claim 1, characterized in that: A clamping hole (311) is arranged on the turntable (310); The chuck component (400) comprises a driving ring (410), a plurality of jaws (420) and a connecting rod (430) corresponding to the jaws (420). The driving ring (410) is rotatably arranged in the clamping hole (311), a plurality of the jaws (420) are annularly and evenly distributed inside the clamping hole (311), one end of the jaw (420) is rotatably connected to the inner wall of the clamping hole (311), the other end of the jaw (420) is rotatably connected to one end of the connecting rod (430), and the other end of the connecting rod (430) is rotatably connected to the driving ring (410); The driving ring (410) is driven by a power component (500).

3. A slant bed multi-station composite CNC machining center according to claim 2, characterized in that: A rotating component (600) is arranged outside the chuck component (400). The rotating component (600) comprises a clamping cylinder (610), a pressing member (620) and a power member (630). The clamping cylinder (610) is rotatably arranged inside the clamping hole (311), the pressing member (620) is arranged on the outer peripheral surface of the clamping cylinder (610), the power member (630) is fixedly arranged on the turntable (310), and the power member (630) is used for driving the pressing member (620) to clamp the clamping cylinder (610); A plurality of the jaws (420) are all rotatably arranged on the clamping cylinder (610).

4. According to claim 3, an inclined-bed multi-station composite CNC machining center, characterized in that: A spiral structure (411) is provided on the driving ring (410); The power assembly (500) includes a telescopic member (510), an abutting member (520) and a guiding member (530). The guiding member (530) is sleeved outside the clamping cylinder (610). The guiding member (530) and the clamping cylinder (610) are slidably arranged. A guiding structure (531) is provided on the guiding member (530). The guiding structure (531) is cooperatively arranged with the spiral structure (411). One end of the telescopic member (510) is fixedly arranged on the turntable (310), and the other end of the telescopic member (510) is rotatably connected to the guiding member (530) through the abutting member (520).

5. The inclined bed multi-station composite CNC machining center according to claim 3, wherein: An angle positioning assembly (700) and a rotating member (710) are further provided on the turntable (310). The angle positioning assembly (700) is used to identify the rotation angle of the clamping cylinder (610). The rotating member (710) is fixedly arranged on the turntable (310), and the rotating member (710) is used to drive the clamping cylinder (610) to rotate.

6. A slant-bed multi-station composite CNC machining center according to claim 5, characterized in that: The angle positioning assembly (700) includes a magnet (720) and a Hall sensor (730). The magnet (720) is fixedly arranged on the clamping cylinder (610). A plurality of Hall sensors (730) are provided. The plurality of Hall sensors (730) are annularly and evenly distributed on the inner wall of the clamping hole (311). The plurality of Hall sensors (730) are correspondingly arranged with the magnet (720).

7. A multi-station compound CNC machining center with an inclined bed according to claim 6, characterized in that: A plurality of magnets (720) are provided. The plurality of magnets (720) are annularly and evenly distributed on the clamping cylinder (610), and the magnetic forces of the plurality of magnets (720) are different.

8. A slant-bed multi-station composite CNC machining center according to any one of claims 1-4, characterized in that: The distance from the axis of the turntable (310) to the bed surface of the inclined bed body (100) is equal to the distance from the axis of the first main shaft (110) to the bed surface of the inclined bed body (100), and the support frame (220) is slidably arranged along the inclination direction of the inclined bed body (100).

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