Angle-adjustable and quick-positioning universal clamp for five-axis machining center
By designing the linkage adjustment of the corner assembly and the clamping assembly, the problems of complicated fixture operation and positioning accuracy dependence on the initial clamping in existing five-axis machining are solved, realizing multi-angle continuous adjustment and efficient and accurate positioning of the workpiece.
Patent Information
- Application Number
- CN202511786348.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-01-16
AI Technical Summary
Existing adjustable angle fixtures are cumbersome to operate in five-axis machining, lack continuity and convenience in angle adjustment, and rely heavily on initial positioning accuracy, making it difficult to achieve fast and highly repeatable workpiece positioning.
A universal fixture comprising a corner assembly and a clamping assembly was designed. The rotating seat and the swing frame are adjusted in conjunction with a worm gear drive. Combined with a fine-tuning platform and a clamping mechanism, the workpiece can be continuously adjusted at multiple angles and precisely positioned at the micron level.
It simplifies the adjustment process of multi-angle clamping, improves the clamping accuracy and efficiency of workpieces in five-axis machining, and achieves highly repeatable and precise alignment.
Smart Images
Figure CN121339984A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of machine tool fixture technology, specifically a universal fixture for five-axis machining centers with adjustable angles and rapid positioning. Background Technology
[0002] A five-axis machining center is a CNC machine tool capable of precision machining of a workpiece in five degrees of freedom. It is widely used in the manufacturing of aerospace, precision molds, medical devices, and complex curved parts. During five-axis machining, the workpiece needs to be stably clamped and positioned with high precision at different angles to meet the requirements of continuous machining on multiple surfaces and angles. Therefore, the fixture, as a key process equipment connecting the workpiece and the machine tool, directly affects machining accuracy, efficiency, and applicability.
[0003] However, existing adjustable angle fixtures typically require multiple independent adjustment steps to set the angle when clamping at multiple angles. This adjustment process involves multiple locking and calibration operations, limiting the continuity and convenience of angle adjustment and impacting clamping efficiency. Furthermore, in terms of achieving rapid positioning, existing structures are highly dependent on initial positioning accuracy. If there is a deviation in the initial position of the workpiece, additional fine-tuning is often required for correction. Therefore, there is still room for improvement in achieving both high repeatability positioning accuracy and rapid clamping. Summary of the Invention
[0004] This invention provides a universal fixture for five-axis machining centers with adjustable angle and rapid positioning. It integrates angle linkage adjustment and multi-level positioning calibration to address the problems of existing fixtures having complicated operation when setting angles and positioning accuracy depending on the initial clamping.
[0005] To achieve the above objectives, the present invention provides the following technical solution: A universal fixture for a five-axis machining center with adjustable angle and rapid positioning includes a base, a corner assembly, and a clamping assembly, wherein: The corner assembly is rotatably mounted on the top of the base. The corner assembly includes a rotating seat and a swing frame. The rotating seat can rotate on the base about a first preset axis, and the swing frame can swing on the rotating seat about a second preset axis. The second preset axis is perpendicular to the first preset axis.
[0006] The clamping assembly is fixedly mounted on the top of the swing frame, and the clamping assembly is used to fix the workpiece.
[0007] Optionally, the corner assembly further includes a first driving part and a second driving part. The first driving part is disposed between the base and the rotating seat and is used to drive the rotating seat to rotate around the first preset axis. The second driving part is disposed between the rotating seat and the swing frame and is used to drive the swing frame to swing around the second preset axis.
[0008] Optionally, the first driving unit includes a first worm gear and a first worm. The first worm gear is coaxially fixed to the bottom of the rotating base, and the first worm is meshed with the first worm gear. The two ends of the first worm are rotatably connected to the top of the base via bearing seats. The second driving unit includes a second worm gear and a second worm. The second worm gear is coaxially fixed to the side of the swing frame, and the second worm is meshed with the second worm gear. The two ends of the second worm are rotatably connected to the rotating base via bearing seats.
[0009] Optionally, the top of the base has a first annular scale groove around the outer periphery of the rotating seat, and a first indicator needle is fixedly connected to the outer wall of the rotating seat, with the tip of the first indicator needle pointing towards the inside of the first annular scale groove. The side wall of the rotating seat has a second arc-shaped scale groove around the rotation axis of the swing frame, and a second indicator needle is fixedly connected to the side wall of the swing frame, with the tip of the second indicator needle pointing towards the inside of the second arc-shaped scale groove.
[0010] Optionally, the clamping assembly includes a support base plate, a fine-tuning platform, and a clamping mechanism. The support base plate is fixed to the top of the swing frame, the fine-tuning platform is slidably connected to the top surface of the support base plate, and the clamping mechanism is mounted on the top of the fine-tuning platform.
[0011] Optionally, the top surface of the supporting base plate is provided with a first guide groove and a second guide groove that are orthogonal to each other. The bottom of the fine-tuning platform is fixedly connected with a first slider that mates with the first guide groove and a second slider that mates with the second guide groove. The side wall of the supporting base plate is threadedly connected with a first adjusting bolt and a second adjusting bolt. The end of the first adjusting bolt abuts against the first side wall of the fine-tuning platform, and the end of the second adjusting bolt abuts against the second side wall of the fine-tuning platform.
[0012] Optionally, a first reset spring and a second reset spring are also fixedly connected to the bearing base plate. The first reset spring is located on the side of the fine-tuning platform opposite to the first adjusting bolt, and the second reset spring is located on the side of the fine-tuning platform opposite to the second adjusting bolt.
[0013] Optionally, the clamping mechanism includes two symmetrically arranged clamping arms, both of which are slidably connected to the top of the fine-tuning platform. The clamping mechanism also includes a drive screw, with a positive thread section and a negative thread section at both ends. The bottom of both clamping arms is provided with threaded holes that cooperate with the drive screw. The two ends of the drive screw are rotatably mounted on the fine-tuning platform through bearing seats.
[0014] Optionally, the bottom of the base is fixedly connected with multiple positioning blocks, which are used to mate with the T-slots of the five-axis machining center's worktable. The top surface of the base has multiple reference pin holes for installing positioning pins to achieve initial rapid alignment of the fixture.
[0015] Optionally, when the first worm rotates, it drives the first worm wheel and the rotating seat to rotate around the first preset axis, and when the second worm rotates, it drives the second worm wheel and the swing frame to swing around the second preset axis. The self-locking characteristic of the worm wheel and worm gear transmission ensures that the rotating seat and the swing frame remain fixed after being adjusted to the target angle. The first indicator needle cooperates with the first annular scale groove and the second indicator needle cooperates with the second arc-shaped scale groove to intuitively feedback the angle adjustment result and ensure the accuracy of angle repeatability positioning.
[0016] Optionally, the first adjusting bolt and the second adjusting bolt respectively drive the fine-tuning platform to slide along the first guide groove and the second guide groove, and the first return spring and the second return spring provide reverse preload to eliminate the adjustment gap; when the drive screw rotates, its positive thread section and negative thread section drive the two clamping arms to move in opposite directions or away from each other, so as to realize the rapid clamping or loosening of the workpiece; the positioning pressure block of the base cooperates with the T-slot of the machining center worktable, and the reference pin hole assists in the initial alignment. With the angle adjustment of the corner assembly and the position calibration of the fine-tuning platform, the workpiece can be accurately positioned in multiple dimensions.
[0017] This invention provides a universal fixture for five-axis machining centers with adjustable angles and rapid positioning, which has the following advantages: This universal fixture for five-axis machining centers, featuring adjustable angles and rapid positioning, utilizes a rotating assembly. The first and second drive units work together to drive the rotary table and swing frame to rotate and swing, respectively. This enables continuous and smooth angle adjustment of the workpiece clamping posture along two vertical axes. The worm gear structure has a self-locking characteristic, locking immediately after angle adjustment without requiring additional locking and calibration steps, simplifying the adjustment process for multi-angle clamping. Furthermore, a fine-tuning platform is integrated within the clamping assembly. After initial workpiece clamping, the first and second adjusting bolts allow for micron-level translational calibration within the plane of the supporting base plate. This effectively compensates for initial workpiece placement deviations, achieving highly repeatable and precise alignment, comprehensively improving the clamping accuracy and operational efficiency of complex workpieces in five-axis machining processes. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of the universal clamp of the present invention; Figure 2 This is a partially enlarged structural diagram of the corner assembly of the present invention; Figure 3 This is an enlarged structural schematic diagram of the clamping assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection structure between the fine-tuning platform and the supporting base plate of the present invention; Figure 5 This is a schematic diagram of the clamping mechanism assembly structure according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. Base; 2. Rotary seat; 3. Swing frame; 4. First drive unit; 5. Second drive unit; 6. First worm gear; 7. First worm; 8. Second worm gear; 9. Second worm; 10. First annular scale groove; 11. First indicator needle; 12. Second arc-shaped scale groove; 13. Second indicator needle; 14. Bearing base plate; 15. Fine-tuning platform; 16. Clamping arm; 17. Drive screw; 18. Positioning block. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] Please see Figures 1 to 5The present invention provides a technical solution: a universal fixture with adjustable angle and rapid positioning for a five-axis machining center. This fixture is mainly used for multi-angle, high-precision clamping and positioning of workpieces with complex shapes during five-axis machining.
[0021] Reference Figure 1 The universal fixture of this invention comprises a base 1, a corner assembly disposed on top of the base 1, and a clamping assembly mounted on top of the corner assembly. The base 1 serves as the supporting foundation for the entire fixture, possessing a stable structure and made of high-strength cast iron or steel to withstand cutting forces and vibrations during machining. Multiple positioning blocks 18 are fixedly connected to the bottom of the base 1. The cross-sectional shape of the positioning blocks 18 is adapted to the T-slot of the five-axis machining center's worktable. Bolts are used to securely mount the entire base 1 onto the machine tool's worktable. Furthermore, multiple high-precision reference pin holes are machined on the top surface of the base 1. The axes of these reference pin holes are strictly parallel or perpendicular to the fixture's theoretical coordinate system. During fixture installation, positioning pins can be inserted into the reference pin holes and cooperate with reference elements on the machine tool's worktable to achieve rapid initial alignment of the fixture in the machine tool's coordinate system.
[0022] Please see Figure 1 and Figure 2 The rotating assembly is the core component for achieving multi-angle adjustment of the workpiece, and it includes a rotating base 2 and a swing frame 3. The rotating base 2 has a disc-shaped structure with an integrally formed journal at its bottom. This journal is rotatably connected to a bearing hole at the center of the top of the base 1 via a deep groove ball bearing or an angular contact bearing. This connection method defines that the rotating base 2 can only rotate around a first preset axis perpendicular to the top surface of the base 1. The swing frame 3 has an overall U-shaped frame structure, and the inner sides of its two arm ends are rotatably connected to corresponding bearing seats on the side wall of the rotating base 2 via bearings, thereby defining that the swing frame 3 can swing around a second preset horizontal axis on the rotating base 2. The second preset axis is perpendicular to and intersects the first preset axis in space, and the intersection point is the rotation center of this fixture.
[0023] To drive the movement of the rotating seat 2 and the swing frame 3, the corner assembly further includes a first drive unit 4 and a second drive unit 5. The first drive unit 4 is disposed between the base 1 and the rotating seat 2, and the second drive unit 5 is disposed between the rotating seat 2 and the swing frame 3. Specifically, the first drive unit 4 includes a first worm gear 6 and a first worm 7. The first worm gear 6 is a ring gear, which is coaxially fixed to the bottom outer edge of the rotating seat 2 by bolts. The axis of the first worm 7 is horizontally arranged, and its thread meshes with the gear teeth of the first worm gear 6. The two ends of the first worm 7 are rotatably mounted to specific positions on the top of the base 1 through bearing seats. The portion of the first worm 7 extending out of the bearing seat is machined with a hexagonal head or a square head, allowing the operator to rotate it using a wrench. When the first worm 7 is rotated, through the transmission relationship of the worm gear and worm wheel, the first worm gear 6 and the rotating seat 2 fixed thereto are driven to rotate slowly and smoothly around the first preset axis.
[0024] Similarly, the second drive unit 5 includes a second worm gear 8 and a second worm 9. The second worm gear 8 has a sector gear structure and is coaxially fixed to the outer wall of one arm end of the swing frame 3 by bolts, with its center coinciding with the second preset axis. The axis of the second worm 9 is parallel to the axis of the first worm 7, and its thread meshes with the teeth of the second worm gear 8. Both ends of the second worm 9 are rotatably mounted to the side wall of the rotating seat 2 via bearing seats. The portion of the second worm 9 extending out of the bearing seat is also machined with a structure for tool operation. When the second worm 9 is rotated, it drives the second worm gear 8 and the swing frame 3 fixed thereto to swing around the second preset axis. The worm gear transmission mechanism has the characteristics of smooth transmission, large transmission ratio, and reverse self-locking. Therefore, after adjusting to the specified angle, even if the operating tool is removed, the rotating seat 2 and the swing frame 3 will stably remain in the current position due to friction self-locking, without the need for an additional locking mechanism.
[0025] To allow for intuitive reading and setting of rotation and oscillation angles, this fixture is equipped with a corresponding scale indicator structure. Please continue reading. Figure 1On the outer periphery of the top of the base 1, surrounding the rotating seat 2, a first annular scale groove 10 is formed, with 360-degree angle scale lines engraved on the inner wall of the groove. A first indicator needle 11 is fixedly connected to the outer wall of the rotating seat 2, with its tip precisely pointing into the interior of the first annular scale groove 10. By observing the position of the first indicator needle 11 on the scale line, the rotation angle of the rotating seat 2 relative to the base 1 can be read. Simultaneously, on the side wall of the rotating seat 2, with a second predetermined axis as the center, a second arc-shaped scale groove 12 is formed, with angle scale lines engraved on the inner wall of the groove, for example, from -45 degrees to +90 degrees. A second indicator needle 13 is fixedly connected to the side wall of the swing frame 3, with its tip pointing into the interior of the second arc-shaped scale groove 12, used to indicate the swing angle of the swing frame 3 relative to the rotating seat 2.
[0026] Please see Figure 1 , Figure 3 and Figure 4 The clamping assembly is fixedly installed on the top platform of the swing frame 3, and includes a bearing base plate 14, a fine-tuning platform 15, and a clamping mechanism. The bearing base plate 14 is firmly fixed to the top of the crossbeam of the U-shaped frame of the swing frame 3 by bolts. The top surface of the bearing base plate 14 is precision ground and has a high degree of flatness. On this top surface, a first guide groove and a second guide groove are respectively formed in two mutually orthogonal directions, and both guide grooves have rectangular cross sections.
[0027] The fine-tuning platform 15 is a rectangular plate, the bottom surface of which is also precision ground. At the bottom of the fine-tuning platform 15, a first slider that mates with the first guide groove and a second slider that mates with the second guide groove are fixedly connected. The dimensions of the first and second sliders are precisely matched with their corresponding guide grooves, enabling the fine-tuning platform 15 to slide along two orthogonal directions on the top of the supporting base plate 14. A first adjusting bolt and a second adjusting bolt are threaded onto two adjacent sidewalls of the supporting base plate 14, respectively. The axis of the first adjusting bolt is parallel to the first guide groove, and its end is quenched and ground, smoothly abutting against the first sidewall of the fine-tuning platform 15. The axis of the second adjusting bolt is parallel to the second guide groove, and its end also abuts against the second sidewall of the fine-tuning platform 15.
[0028] To eliminate adjustment gaps and provide preload, a first return spring and a second return spring are fixedly connected to the support base plate 14. The first return spring is located on the side of the fine-tuning platform 15 opposite to the first adjusting bolt, with its two ends abutting against the side wall of the fine-tuning platform 15 and a stop fixed on the support base plate 14, respectively. The second return spring is located on the side of the fine-tuning platform 15 opposite to the second adjusting bolt, and its structure is similar to that of the first return spring. In the assembled state, both springs are in a compressed state, and their elastic force pushes the two side walls of the fine-tuning platform 15 tightly against the ends of the first and second adjusting bolts, respectively. When fine-tuning of the workpiece position is required, screwing in the first adjusting bolt will push the fine-tuning platform 15 against the elastic force of the first return spring, causing it to make a small displacement along the direction of the first guide groove; unscrewing the first adjusting bolt will cause the elastic force of the first return spring to push the fine-tuning platform 15 backward following the bolt. The operation of the second adjusting bolt is the same, thereby achieving micron-level precise position calibration of the workpiece in two degrees of freedom in the horizontal plane.
[0029] Please see Figure 3 and Figure 5 The clamping mechanism is mounted on the top of the fine-tuning platform 15 for final fixation of the workpiece. The clamping mechanism includes two symmetrically arranged clamping arms 16 and a drive screw 17. The top of the fine-tuning platform 15 has two parallel guide grooves, and the bottom of each clamping arm 16 has a slider that mates with the guide grooves, allowing it to slide along the length of the guide grooves. The two ends of the drive screw 17 are rotatably mounted to the two ends of the fine-tuning platform 15 via bearing seats. The drive screw 17 is unique in that its axis splits at the midpoint, with one end having a positive thread and the other a negative thread. The bottom of each clamping arm 16 has a threaded hole; one threaded hole mates with the positive thread and the other with the negative thread. At one end of the drive screw 17, a hexagonal head for wrench operation is also provided. When the drive screw 17 is rotated, due to the action of the positive and negative threads, the two clamping arms 16 move simultaneously towards or away from each other, thereby achieving rapid clamping or releasing of the workpiece. The part of each clamping arm 16 that contacts the workpiece can also be replaced with different grippers depending on the shape of the workpiece.
[0030] In this invention, when the first worm 7 rotates, it drives the first worm wheel 6 and the rotating seat 2 to rotate around the first preset axis. When the second worm 9 rotates, it drives the second worm wheel 8 and the swing frame 3 to swing around the second preset axis. The self-locking characteristic of the worm gear transmission ensures that the rotating seat 2 and the swing frame 3 remain fixed after being adjusted to the target angle. The first indicator needle 11 cooperates with the first annular scale groove 10, and the second indicator needle 13 cooperates with the second arc-shaped scale groove 12 to provide intuitive feedback on the angle adjustment result and ensure the accuracy of angle repeatability positioning.
[0031] In this invention, the first adjusting bolt and the second adjusting bolt respectively drive the fine-tuning platform 15 to slide along the first guide groove and the second guide groove. The first return spring and the second return spring provide reverse preload force to eliminate the adjustment gap. When the drive screw 17 rotates, its positive thread section and negative thread section drive the two clamping arms 16 to move towards or away from each other, so as to realize the rapid clamping or loosening of the workpiece. The positioning pressure block 18 of the base 1 cooperates with the T-slot of the machining center worktable, and the reference pin hole assists in the initial alignment. With the angle adjustment of the corner assembly and the position calibration of the fine-tuning platform, the workpiece is accurately positioned in multiple dimensions.
[0032] The universal fixture described in this invention is used in a five-axis machining center as follows: The first step is installation and alignment. Insert the positioning block 18 at the bottom of the fixture into the T-slot of the machine tool table and tighten it with bolts. Insert the positioning pin into the reference pin hole at the top of the base 1. Establish the workpiece coordinate system by touching the positioning pin with the machine tool's edge finder or probe, completing the initial rapid positioning of the fixture.
[0033] The second step is angle setting. According to the processing requirements, use a wrench to rotate the end of the first worm gear 7, driving the rotating seat 2 to rotate to the target angle. The angle value is read and confirmed using the first indicator 11 and the first annular scale groove 10. Then, rotate the end of the second worm gear 9, driving the swing frame 3 to swing to the target angle. The angle value is read and confirmed using the second indicator 13 and the second arc-shaped scale groove 12. Due to the self-locking property of the worm gear, the position is locked after the angle setting is completed.
[0034] The third step is workpiece clamping. Rotate the drive screw 17 to open the two clamping arms 16. Place the workpiece to be processed on the fine-tuning platform 15, between the two clamping arms 16. Rotate the drive screw 17 in the opposite direction, and the two clamping arms 16 move towards each other, firmly clamping the workpiece.
[0035] The fourth step is precise positioning. After the workpiece is initially clamped, a machine tool probe or other measuring tools are used to check the actual position of the reference points or reference surfaces on the workpiece. If there is a positional deviation, the fine-tuning platform 15 is translated and fine-tuned by rotating the first and second adjusting bolts until the actual position of the workpiece completely coincides with the theoretical position. After precise positioning is completed, five-axis linkage machining can begin.
Claims
1. A universal fixture with adjustable angle and quick positioning for five-axis machining center, characterized in that: The utility model relates to a rotary corner cutting device, including base (1), corner assembly and clamping assembly, wherein: The corner assembly is rotatably installed on the top of the base (1), and the corner assembly comprises a rotating seat (2) and a swing frame (3), the rotating seat (2) can rotate on the base (1) around a first preset axis, and the swing frame (3) can swing on the rotating seat (2) around a second preset axis, and the second preset axis is perpendicular to the first preset axis.
2. The clamping assembly is fixedly installed on the top of the swing frame (3), and the clamping assembly comprises a bearing bottom plate (14), a fine adjustment platform (15) and a clamping mechanism, the bearing bottom plate (14) is fixed on the top of the swing frame (3), the fine adjustment platform (15) is slidably connected to the top surface of the bearing bottom plate (14), and the clamping mechanism is installed on the top of the fine adjustment platform (15).
3. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 1, characterized in that: The corner assembly further comprises a first driving part (4) and a second driving part (5), the first driving part (4) is arranged between the base (1) and the rotating seat (2) and is used for driving the rotating seat (2) to rotate around the first preset axis, and the second driving part (5) is arranged between the rotating seat (2) and the swing frame (3) and is used for driving the swing frame (3) to swing around the second preset axis.
4. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 2, characterized in that: The first driving part (4) comprises a first worm wheel (6) and a first worm (7), the first worm wheel (6) is coaxially fixed to the bottom of the rotating seat (2), the first worm (7) is meshedly connected to the first worm wheel (6), and the two ends of the first worm (7) are rotatably connected to the base (1) through a bearing seat; the second driving part (5) comprises a second worm wheel (8) and a second worm (9), the second worm wheel (8) is coaxially fixed to the side of the swing frame (3), the second worm (9) is meshedly connected to the second worm wheel (8), and the two ends of the second worm (9) are rotatably connected to the rotating seat (2) through a bearing seat.
5. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 1, characterized in that: A first annular scale groove (10) is formed in the top of the base (1) around the rotating seat (2), a first indicating needle (11) is fixedly connected to the outer wall of the rotating seat (2), and the tip of the first indicating needle (11) points to the inside of the first annular scale groove (10); a second arc-shaped scale groove (12) is formed in the side wall of the rotating seat (2) around the rotation axis of the swing frame (3), a second indicating needle (13) is fixedly connected to the side wall of the swing frame (3), and the tip of the second indicating needle (13) points to the inside of the second arc-shaped scale groove (12).
6. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 1, characterized in that: The top surface of the bearing bottom plate (14) is provided with a first guide groove and a second guide groove which are perpendicular to each other, and the bottom of the fine adjustment platform (15) is fixedly connected with a first sliding block matched with the first guide groove and a second sliding block matched with the second guide groove; the side wall of the bearing bottom plate (14) is threadedly connected with a first adjusting bolt and a second adjusting bolt, and the end of the first adjusting bolt abuts against the first side wall of the fine adjustment platform (15), and the end of the second adjusting bolt abuts against the second side wall of the fine adjustment platform (15).
7. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 5, characterized in that: The bearing bottom plate (14) is further fixedly connected with a first reset spring and a second reset spring, the first reset spring is arranged on the side of the fine adjustment platform (15) opposite to the first adjusting bolt, and the second reset spring is arranged on the side of the fine adjustment platform (15) opposite to the second adjusting bolt.
8. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 1, characterized in that: The clamping mechanism comprises two symmetrically arranged clamping arms (16), and the two clamping arms (16) are slidably connected to the top of the fine adjustment platform (15); the clamping mechanism further comprises a driving lead screw (17), the two ends of the driving lead screw (17) are a right-handed thread segment and a left-handed thread segment respectively, the bottom of each of the two clamping arms (16) is provided with a threaded hole matched with the driving lead screw (17), and the two ends of the driving lead screw (17) are rotatably installed on the fine adjustment platform (15) through bearing seats.
9. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 1, characterized in that: The bottom of the base (1) is fixedly connected with a plurality of positioning pressing blocks (18), and the positioning pressing blocks (18) are used for cooperating with a T-shaped groove of a five-axis machining center workbench; a plurality of reference pin holes are formed in the top surface of the base (1).
10. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 3, characterized in that, The first worm (7) drives the first worm wheel (6) and the rotating seat (2) to rotate around the first preset axis when rotating, and the second worm (9) drives the second worm wheel (8) and the swing frame (3) to swing around the second preset axis when rotating; the self-locking characteristic of the worm and gear transmission makes the rotating seat (2) and the swing frame (3) remain fixed after being adjusted to the target angle, and the first indicating needle (11) cooperates with the first annular scale groove (10), and the second indicating needle (13) cooperates with the second arc-shaped scale groove (12).
11. The angle adjustable and quick positioning universal fixture for five-axis machining center according to claim 5, characterized in that, The first adjusting bolt and the second adjusting bolt drive the fine adjustment platform (15) to slide along the first guide groove and the second guide groove respectively, the first reset spring and the second reset spring provide reverse pre-tightening force to eliminate the adjustment gap; when the driving lead screw (17) rotates, the right-handed thread segment and the left-handed thread segment drive the two clamping arms (16) to move towards or away from each other; the positioning pressing blocks (18) of the base (1) cooperate with the T-shaped groove of the machining center workbench, the reference pin holes assist initial alignment, and the angle adjustment of the rotating angle assembly and the position calibration of the fine adjustment platform are matched.