Integrated double brake cam roller five-axis numerical control rotary table

Abstract

The application discloses an integrated double-brake cam roller five-axis numerical control rotary table, and relates to the technical field of core functional components of numerical control machine tools; in view of the problems of insufficient brake torque, poor transmission rigidity and incapability of real-time error compensation of the existing cam roller five-axis rotary table, a disc brake + annular hydraulic composite brake mechanism is arranged on the tilt shaft and the rotation shaft, a symmetrical cam roller transmission structure is adopted, and an error compensation unit based on an absolute time grating sensor and a BP neural network is arranged in the cam roller transmission structure; brake torque of the application is increased by more than 65%, repeat positioning accuracy is increased by 30%, load capacity is increased by 25%, accuracy retention is increased by 40%, and the application can be widely applied to high-precision machining of complex curved surface parts in the fields of aerospace and automobile manufacturing.

Description

Technical Field

[0001] This invention relates to the technical field of core functional components of CNC machine tools, and in particular to an integrated dual-brake cam roller five-axis CNC rotary table. Background Technology

[0002] The CNC rotary table is a core functional component of CNC machine tools, enabling multi-degree-of-freedom precision machining. By providing the machine tool with fourth and fifth axis rotational indexing capabilities, it supports the efficient machining of complex curved surface parts in fields such as aerospace, automotive manufacturing, and precision mold making. Currently, mainstream CNC rotary tables mainly adopt two technical routes: worm gear transmission and cam roller transmission.

[0003] Worm gear rotary tables have captured the mid-to-low-end market due to their mature manufacturing process and relatively low cost. While they can achieve high indexing accuracy initially, the use of sliding friction transmission leads to irreversible wear and tear on the worm gear pair over long-term operation, causing a rapid decline in transmission accuracy. Regular calibration and adjustment are necessary, increasing equipment maintenance costs and downtime. Cam roller rotary tables, employing a preloaded zero-backlash rolling transmission mechanism, fundamentally eliminate the wear problem caused by sliding friction. They offer significant advantages such as good accuracy retention, high transmission efficiency, and long service life, and have become the mainstream direction for the development of high-end CNC rotary table technology.

[0004] However, existing cam roller five-axis CNC rotary tables still have many technical shortcomings in practical applications: 1. Brake locking systems generally use a single braking method. In heavy machining scenarios with high load and large cutting force, the braking torque is insufficient and the stability is poor. It is easy to produce micron-level displacement, which directly affects the machining accuracy and surface quality of the workpiece.

[0005] 2. The tilt axis (A-axis) often adopts a single-sided drive structure, resulting in uneven force on the transmission chain, which leads to insufficient overall transmission rigidity and limits the maximum load capacity and dynamic response speed of the turntable.

[0006] 3. Error compensation functions mostly rely on external detection equipment such as laser interferometers for offline calibration, which cannot sense position errors in the machining process in real time and perform dynamic compensation, making it difficult to meet the needs of high-precision continuous machining.

[0007] 4. The overall structure has a low degree of integration, with functional modules such as drive, braking, and detection scattered. This not only increases the size and installation complexity of the turntable, but also makes it inconvenient for later maintenance and parts replacement.

[0008] Therefore, there is an urgent need to develop a new type of integrated dual-brake cam roller five-axis CNC rotary table to solve the above-mentioned problems in the existing technology. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated dual-brake cam roller five-axis CNC rotary table. By adopting a composite braking method of disc brake + ring hydraulic brake on the tilting axis and the rotating axis, combined with a symmetrical cam roller transmission structure and built-in error compensation sensor, the braking locking force, transmission rigidity and machining accuracy of the rotary table are significantly improved.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An integrated dual-brake cam roller five-axis CNC rotary table includes a base, a left support seat and a right support seat symmetrically arranged at both ends of the base, a cradle frame rotatably arranged between the left support seat and the right support seat, and a rotary worktable rotatably arranged on the cradle frame. The left support is provided with a tilting shaft drive mechanism, which includes a first servo motor, a first arc-shaped cam, and a first roller driven plate that cooperates with the first arc-shaped cam. The first roller driven plate is fixedly connected to the left end of the cradle frame through a first output shaft. The right support base is provided with an inclined shaft support mechanism, which includes a second output shaft. One end of the second output shaft is fixedly connected to the right end of the cradle frame, and the other end is supported in the right support base by a bearing. The cradle frame is equipped with a rotary shaft drive mechanism, which includes a second servo motor, a second arc-shaped cam, and a second roller driven disc that cooperates with the second arc-shaped cam. The second roller driven disc is fixedly connected to the rotary worktable through a third output shaft. A first compound braking mechanism is provided on the first output shaft, a second compound braking mechanism is provided on the second output shaft, and a third compound braking mechanism is provided on the third output shaft; The first, second, and third composite braking mechanisms all include a disc brake assembly and a ring-shaped hydraulic brake assembly; The cradle frame is also equipped with a built-in error compensation unit, which includes an absolute time grid sensor respectively installed on the first output shaft, the second output shaft and the third output shaft, and a controller electrically connected to the absolute time grid sensor.

[0011] In a preferred embodiment, the disc brake assembly includes a disc brake disc fixed on the output shaft, a fixed brake plate fixed on the housing, and a movable brake plate that can move axially. The movable brake plate is connected to the housing via multiple disc springs.

[0012] In a preferred embodiment, the annular hydraulic braking assembly includes an annular cylinder fixed to the housing and an annular piston disposed within the annular cylinder, wherein the end face of the annular piston is disposed opposite to the end face of the movable brake plate.

[0013] In a preferred embodiment, both the first and second arc-shaped cams are integral structures, and the cam profile surfaces are processed using a pendulum grinding process, with a surface finish Ra≤0.4μm.

[0014] In a preferred embodiment, multiple needle roller bearings are evenly arranged on both the first and second roller driven discs, and the rollers and sleeves of the needle roller bearings are made of forged blanks with a concentricity accuracy of ≤0.5μm after grinding.

[0015] In a preferred embodiment, the left and right support seats are positioned with the base using locating pins and fastened with bolts, and the flatness of the contact surface is ≤0.01mm.

[0016] In a preferred embodiment, the cradle frame adopts an integral casting structure with internal reinforcing ribs arranged in a grid pattern.

[0017] In a preferred embodiment, the absolute time grating sensor has a measurement accuracy of ≤ ±0.5 arcseconds and a data update frequency of ≥10kHz.

[0018] In a preferred embodiment, the controller uses a BP neural network algorithm to predict the position data collected by the absolute time grating sensor, thereby achieving real-time error compensation.

[0019] In a preferred embodiment, the maximum braking torque of the first composite braking mechanism, the second composite braking mechanism, and the third composite braking mechanism is ≥5000 N·m.

[0020] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are as follows: This invention addresses the technical shortcomings of existing cam roller five-axis CNC rotary tables, such as insufficient brake locking force, weak transmission rigidity, inability to compensate for real-time errors, and low integration. Through improvements such as a composite braking structure, symmetrical transmission layout, and built-in intelligent error compensation unit, the invention achieves the following significant benefits: 1. Significantly improves braking locking performance and ensures high precision in heavy-duty machining. The composite braking structure combines disc brake components with ring hydraulic brake components. Through the dual action of disc spring preload and hydraulic thrust, the positive pressure is increased, and the braking torque is increased by more than 65% compared with a single brake turntable of the same specification. The locking stability is significantly enhanced. It can effectively resist small angular displacements under large cutting forces, avoid workpiece machining of vibration marks and dimensional deviations, and significantly improve machining accuracy and surface quality in heavy cutting scenarios.

[0021] 2. Optimize the transmission force layout to enhance rigidity and load capacity. Adopt a symmetrical tilting shaft layout with left drive and right support, combined with a preloaded zero backlash cam roller transmission mechanism. The transmission chain is evenly stressed, and the overall transmission rigidity is increased by more than 30% compared with the single-sided cantilever structure. The maximum horizontal load of the turntable is increased by 25%, and the dynamic response time is shortened by 33%. It can be adapted to the processing of heavier and more complex parts, while meeting the dynamic response requirements of high-speed indexing.

[0022] 3. Real-time dynamic error compensation improves positioning accuracy. The built-in error compensation unit based on absolute time grating sensor and BP neural network algorithm can collect real-time position data of each axis at high frequency and correct position deviations in advance through prediction model, which solves the problem that traditional offline calibration cannot adapt to dynamic errors in the machining process. The repeatability of the turntable is improved by 30% compared with existing products, and the positioning accuracy is improved by more than 20%, which can meet the ultra-high precision machining needs of aerospace, precision mold and other fields.

[0023] 4. Highly integrated structural design reduces installation and maintenance costs. The drive mechanism, braking mechanism, detection and compensation unit are all integrated inside the turntable housing, resulting in a compact structure and small size. No additional external detection and braking auxiliary equipment is required. It can be directly adapted to standard vertical and horizontal machining centers and gantry machine tools, with strong installation adaptability. At the same time, the modular layout facilitates the later inspection and replacement of parts, greatly reducing the equipment installation and operation and maintenance costs.

[0024] 5. Excellent precision retention, extending equipment lifespan. The cam profile is machined using an oscillating grinding process and is paired with a high-precision needle roller bearing made of forged blank. The transmission pair is pure rolling friction, resulting in extremely low wear. After 1000 hours of continuous operation, the precision decay rate is ≤5%, and the precision retention is 40% higher than that of traditional products. Frequent precision calibration and clearance adjustment are not required, effectively extending the turntable's lifespan and reducing long-term operating costs.

[0025] 6. Promoting the localization of high-end rotary tables and possessing significant industrial value: The technical solution of this invention can completely replace imported five-axis CNC rotary tables of the same specifications. The product cost is only 50%-60% of that of imported similar products, which can significantly reduce the manufacturing cost of downstream high-end CNC machine tools and has important industrial value for the independent control of my country's high-end equipment manufacturing industry chain. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the integrated dual-brake cam roller five-axis CNC rotary table of the present invention; Figure 2 This is a schematic diagram of the tilting shaft drive mechanism of the present invention; Figure 3 This is a schematic diagram of the rotary shaft drive mechanism of the present invention; Figure 4 This is a schematic diagram of the composite braking mechanism of the present invention; Figure 5 This is a circuit block diagram of the built-in error compensation unit of the present invention; The components are as follows: 1. Base; 2. Left support seat; 3. Right support seat; 4. Cradle frame; 5. Rotary worktable; 6. Inclined shaft drive mechanism; 61. First servo motor; 62. First arc-shaped cam; 63. First roller driven disc; 64. First output shaft; 7. Inclined shaft support mechanism; 71. Second output shaft; 8. Rotary shaft drive mechanism; 81. Second servo motor; 82. Second arc-shaped cam; 83. Second roller driven disc; 84. Third output shaft; 9. First compound braking mechanism; 91. Disc brake assembly; 911. Disc brake disc; 912. Fixed brake plate; 913. Movable brake plate; 914. Disc spring; 92. Annular hydraulic braking assembly; 921. Annular cylinder; 922. Annular piston; 10. Built-in error compensation unit; 101. Absolute time grid sensor; 102. Controller. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Example 1 like Figure 1-5 As shown, the present invention discloses an integrated dual-brake cam roller five-axis CNC rotary table, including a base 1, a left support seat 2 and a right support seat 3 symmetrically arranged at both ends of the base 1, a cradle frame 4 rotatably arranged between the left support seat 2 and the right support seat 3, and a rotary worktable 5 rotatably arranged on the cradle frame 4.

[0035] The left support 2 is provided with a tilting shaft drive mechanism 6. The tilting shaft drive mechanism 6 includes a first servo motor 61, a first arc surface cam 62, and a first roller driven plate 63 that cooperates with the first arc surface cam 62. The first roller driven plate 63 is fixedly connected to the left end of the cradle frame 4 through a first output shaft 64.

[0036] An inclined shaft support mechanism 7 is provided inside the right support base 3. The inclined shaft support mechanism 7 includes a second output shaft 71. One end of the second output shaft 71 is fixedly connected to the right end of the cradle frame 4, and the other end is supported in the right support base 3 by a bearing.

[0037] The cradle frame 4 is equipped with a rotary shaft drive mechanism 8, which includes a second servo motor 81, a second arc-shaped cam 82, and a second roller driven disk 83 that cooperates with the second arc-shaped cam 82. The second roller driven disk 83 is fixedly connected to the rotary table 5 through a third output shaft 84.

[0038] A first compound braking mechanism 9 is provided on the first output shaft 64, a second compound braking mechanism is provided on the second output shaft 71, and a third compound braking mechanism is provided on the third output shaft 84. The first compound braking mechanism 9, the second compound braking mechanism, and the third compound braking mechanism have the same structure, each including a disc brake assembly 91 and an annular hydraulic brake assembly 92.

[0039] The disc brake assembly 91 includes a disc brake disc 911 fixed on the output shaft, a fixed brake plate 912 fixed on the housing, and a movable brake plate 913 that can move axially. The movable brake plate 913 is connected to the housing through multiple disc springs 914.

[0040] The annular hydraulic braking assembly 92 includes an annular cylinder 921 fixed on the housing and an annular piston 922 disposed inside the annular cylinder 921, with the end face of the annular piston 922 facing the end face of the movable brake plate 913.

[0041] When braking is required, hydraulic oil enters the annular cylinder 921, pushing the annular piston 922 to move axially. The annular piston 922 pushes the movable brake plate 913 to overcome the spring force of the disc spring 914, clamping the disc brake disc 911 between the fixed brake plate 912 and the movable brake plate 913, thus achieving braking. When braking needs to be released, the hydraulic oil is depressurized, the disc spring 914 pushes the movable brake plate 913 to return to its original position, releasing the disc brake disc 911.

[0042] The cradle frame 4 is also equipped with a built-in error compensation unit 10. The built-in error compensation unit 10 includes an absolute time grid sensor 101 respectively installed on the first output shaft 64, the second output shaft 71 and the third output shaft 84, and a controller 102 electrically connected to the absolute time grid sensor 101.

[0043] The absolute time grating sensor 101 has a measurement accuracy of ≤ ±0.5 arcseconds and a data update frequency of ≥10kHz. The controller 102 uses a BP neural network algorithm to predict the position data collected by the absolute time grating sensor 101 to achieve real-time error compensation.

[0044] Both the first arc-shaped cam 62 and the second arc-shaped cam 82 adopt an integral structure. The cam profile surface is processed by a wobble grinding process, and the surface finish Ra≤0.4μm. Multiple needle roller bearings are evenly arranged on both the first roller driven plate 63 and the second roller driven plate 83. The rollers and sleeves of the needle roller bearings are made of forged blanks, and the concentricity accuracy of the grinding is ≤0.5μm.

[0045] The left support 2 and right support 3 are positioned with the base 1 using locating pins and fastened with bolts, and the flatness of the contact surface is ≤0.01mm. The cradle frame 4 adopts an integral casting structure with internal reinforcing ribs distributed in a grid pattern, which improves the rigidity and stability of the cradle frame.

[0046] The working principle of this invention is as follows: When tilting axis (A-axis) movement is required, the first servo motor 61 drives the first arc-shaped cam 62 to rotate. The first arc-shaped cam 62 drives the first roller driven disk 63 and the first output shaft 64 to rotate, thereby causing the cradle frame 4 to rotate around the A-axis.

[0047] When a rotary axis (C-axis) movement is required, the second servo motor 81 drives the second arc-shaped cam 82 to rotate. The second arc-shaped cam 82 drives the second roller driven disk 83 and the third output shaft 84 to rotate, thereby driving the rotary table 5 to rotate around the C-axis.

[0048] During the machining process, the absolute time-grid sensor 101 collects the position data of the first output shaft 64, the second output shaft 71, and the third output shaft 84 in real time and transmits the data to the controller 102. The controller 102 uses a BP neural network algorithm to predict the position data, calculate the position error, and send the error compensation signal to the first servo motor 61 and the second servo motor 81 to achieve real-time error compensation.

[0049] When cutting is required, the first compound braking mechanism 9, the second compound braking mechanism and the third compound braking mechanism work simultaneously to lock the first output shaft 64, the second output shaft 71 and the third output shaft 84 to prevent small displacements under the action of cutting force and ensure machining accuracy.

[0050] Example 2 This embodiment provides an AC250 integrated dual-brake cam roller five-axis CNC rotary table, suitable for vertical and horizontal machining centers, which can realize five-axis linkage machining of complex curved surface parts.

[0051] 1. Overall structural parameters.

[0052] The base 1 is made of HT300 gray cast iron and has dimensions of 650mm×450mm×180mm. It undergoes two aging treatments to eliminate internal stress and has a surface flatness of ≤0.008mm.

[0053] The left support 2 and the right support 3 are made of HT300 gray cast iron and are symmetrically distributed at both ends of the base 1 with a center distance of 420mm. They are fastened to the base 1 by 4 φ16mm locating pins and 12 M16 bolts.

[0054] Cradle frame 4 is made of HT300 gray cast iron and has a crisscrossing grid-like reinforcing ribs inside. The rib plate is 12mm thick and the swing range of cradle frame 4 is -120° to +30°.

[0055] The rotary worktable 5 has a diameter of φ250mm and is made of 45 steel with heat treatment. The surface hardness is HB220-250. There are 12 M10T slots evenly distributed on the worktable surface for clamping workpieces.

[0056] 2. Detailed structure of the drive mechanism.

[0057] The tilting shaft drive mechanism 6: The first servo motor 61 is a 1.5kW absolute servo motor with a rated speed of 3000rpm; the first arc-shaped cam 62 is made of 20CrMnTi alloy steel, carburized and quenched, with a surface hardness of HRC58-62, and the cam profile surface is processed by a pendulum grinding process, with a surface finish of Ra=0.3μm; 12 needle roller bearings are evenly arranged on the first roller driven disc 63, and the rollers and sleeves of the needle roller bearings are made of GCr15 bearing steel forged blanks, with a grinding concentricity accuracy of 0.4μm.

[0058] Rotary shaft drive mechanism 8: The second servo motor 81 is a 2.2kW absolute value servo motor with a rated speed of 3000rpm; the second arc surface cam 82 uses the same material and processing technology as the first arc surface cam 62; 16 needle roller bearings are evenly arranged on the second roller driven plate 83.

[0059] 3. Detailed structure of the composite braking mechanism.

[0060] The first composite braking mechanism 9, the second composite braking mechanism and the third composite braking mechanism have the same structure. The disc brake disc 911 is made of 65Mn spring steel with a thickness of 12mm and an outer diameter of φ180mm. The fixed brake plate 912 and the movable brake plate 913 are made of ductile iron QT500-7, and the friction surfaces are bonded with copper-based powder metallurgy friction plates with a friction coefficient ≥0.4.

[0061] The disc spring 914 is made of 60Si2Mn spring steel. Each composite braking mechanism is equipped with 8 disc springs with a preload of 1200N.

[0062] The annular cylinder 921 is made of 45 steel and has a working pressure of 6MPa. The annular piston 922 has an effective working area of ​​120cm² and a maximum thrust of 7200N.

[0063] 4. Working process of the built-in error compensation unit.

[0064] The absolute time grating sensor 101 is installed at the ends of the first output shaft 64, the second output shaft 71 and the third output shaft 84 respectively, and is coaxially connected with the output shaft. The measurement accuracy is ±0.4 arcseconds and the data update frequency is 15kHz.

[0065] The controller 102 uses an ARM Cortex-M7 microcontroller with a built-in BP neural network prediction model. This model uses the position data of the turntable in the past 10 sampling cycles as input to predict the position error of the next sampling cycle.

[0066] During the processing, the absolute time grating sensor 101 collects the actual position data of the output shaft every 66μs. The controller 102 compares the actual position with the commanded position, calculates the position error, and predicts the error value of the next cycle through the BP neural network model. It then sends a compensation signal to the servo motor in advance to achieve real-time error compensation.

[0067] 5. Performance test results.

[0068] According to testing by a third-party testing agency, the AC250 integrated dual-brake cam roller five-axis CNC rotary table of this embodiment meets the following performance indicators: Tilt axis (A-axis): Repeat positioning accuracy ±3.5 arcseconds, positioning accuracy ±10 arcseconds, maximum braking torque 5200 N·m, maximum horizontal load 120 kg.

[0069] Rotary axis (C-axis): Repeat positioning accuracy ±3 arcseconds, positioning accuracy ±8 arcseconds, maximum braking torque 5800 N·m, maximum cutting torque 120 N·m.

[0070] Dynamic response time: ≤0.1s.

[0071] After 1000 hours of continuous operation, the accuracy decay rate is ≤5%.

[0072] Compared with the existing five-axis CNC rotary table with single brake cam roller of the same specification, the braking torque of this embodiment is increased by 65%, the repeatability is increased by 30%, the load capacity is increased by 25%, and the accuracy retention is increased by 40%.

[0073] Example 3 This embodiment provides an AC320 integrated dual-brake cam roller five-axis CNC rotary table, suitable for large vertical machining centers and gantry machining centers, which can realize five-axis linkage machining of large and complex parts.

[0074] The difference between this embodiment and Embodiment 2 is as follows: The rotary table 5 has a diameter of φ320mm and a maximum horizontal load of 200kg.

[0075] The first servo motor 61 is a 2.2kW absolute value servo motor, and the second servo motor 81 is a 3.7kW absolute value servo motor.

[0076] The first roller driven disc 63 is equipped with 16 needle roller bearings, and the second roller driven disc 83 is equipped with 20 needle roller bearings.

[0077] Each compound braking mechanism is equipped with 12 disc springs with a preload of 1800N, the working pressure of the annular cylinder 921 is 7MPa, and the maximum braking torque is 7500N·m.

[0078] The other structures in this embodiment are the same as in Embodiment 2. After testing, the repeatability of the tilting axis in this embodiment is ±4 arcseconds and the positioning accuracy is ±12 arcseconds. The repeatability of the rotating axis is ±3.5 arcseconds and the positioning accuracy is ±10 arcseconds, which can meet the high-precision machining requirements of large and complex parts.

[0079] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated dual-brake cam roller five-axis CNC rotary table, comprising a base, a left support seat and a right support seat symmetrically arranged at both ends of the base, a cradle frame rotatably arranged between the left support seat and the right support seat, and a rotary worktable rotatably arranged on the cradle frame; The left support is provided with a tilting shaft drive mechanism, which includes a first servo motor, a first arc-shaped cam, and a first roller driven plate that cooperates with the first arc-shaped cam. The first roller driven plate is fixedly connected to the left end of the cradle frame through a first output shaft. The right support base is provided with an inclined shaft support mechanism, which includes a second output shaft. One end of the second output shaft is fixedly connected to the right end of the cradle frame, and the other end is supported in the right support base by a bearing. The cradle frame is equipped with a rotary shaft drive mechanism, which includes a second servo motor, a second arc-shaped cam, and a second roller driven disc that cooperates with the second arc-shaped cam. The second roller driven disc is fixedly connected to the rotary table via a third output shaft. Its characteristic is that: A first compound braking mechanism is provided on the first output shaft, a second compound braking mechanism is provided on the second output shaft, and a third compound braking mechanism is provided on the third output shaft; The first, second, and third composite braking mechanisms all include a disc brake assembly and a ring-shaped hydraulic brake assembly; The cradle frame is also equipped with a built-in error compensation unit, which includes an absolute time grid sensor respectively installed on the first output shaft, the second output shaft and the third output shaft, and a controller electrically connected to the absolute time grid sensor.

2. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, The disc brake assembly includes a disc brake disc fixed on the output shaft, a fixed brake plate fixed on the housing, and a movable brake plate that can move axially. The movable brake plate is connected to the housing through multiple disc springs.

3. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 2, characterized in that, The annular hydraulic braking assembly includes an annular cylinder fixed on the housing and an annular piston disposed inside the annular cylinder, wherein the end face of the annular piston is disposed opposite to the end face of the movable brake plate.

4. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, Both the first and second arc-shaped cams adopt an integral structure, and the cam profile surface is processed by a pendulum grinding process, with a surface finish Ra≤0.4μm.

5. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, Multiple needle roller bearings are evenly arranged on both the first and second roller driven discs. The rollers and sleeves of the needle roller bearings are made of forged blanks, and the concentricity accuracy of the grinding is ≤0.5μm.

6. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, The left and right support seats are positioned with the base by locating pins and fastened with bolts, and the flatness of the contact surface is ≤0.01mm.

7. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, The cradle frame adopts an integral casting structure with internal reinforcing ribs distributed in a grid pattern.

8. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, The absolute time grating sensor has a measurement accuracy of ≤ ±0.5 arcseconds and a data update frequency of ≥10kHz.

9. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, The controller uses a BP neural network algorithm to predict the position data collected by the absolute time grating sensor, thereby achieving real-time error compensation.

10. The integrated dual-brake cam roller five-axis CNC rotary table according to claim 1, characterized in that, The maximum braking torque of the first, second, and third composite braking mechanisms is ≥5000 N·m.

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