High-precision numerical control rotary table structure

Abstract

The utility model discloses a high-precision numerical control rotary table structure which comprises a swing arm, an A-axis main end DD motor, an A-axis auxiliary end DD direct drive motor, a C-axis DD direct drive motor, a C-axis bearing seat, a rotary table, an A-axis main shell, an A-axis auxiliary shell, an A-axis main shaft and an A-axis auxiliary shaft. According to the utility model, the structural design is reasonable, the C-axis DD direct-drive motor is directly adopted to drive the turntable to rotate, and the A-axis main end DD motor and the A-axis auxiliary end DD direct-drive motor are matched to drive the swing arm to swing, so that the transmission structure of the traditional worm and worm gear is greatly simplified, and the work efficiency is improved. And moreover, the problems of low transmission efficiency and low working precision caused by traditional worm and worm wheel transmission are solved, and the device has the advantages of high working precision, quick response, large torque, low noise, low vibration and the like, and is compact in overall structure, small in size, easy to install and beneficial to wide popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of machining center technology, and in particular to a high-precision CNC rotary table structure used in machining centers. Background Technology

[0002] With the increasing maturity of CNC technology in China, five-axis CNC machining centers have been increasingly widely used in various fields in recent years. In practical applications, whenever people encounter the challenge of efficiently and effectively machining complex, irregularly shaped parts, five-axis linkage technology is undoubtedly an important means of solving such problems. In recent years, with the vigorous development of my country's aerospace, military industry, automotive parts, and mold manufacturing industries, more and more manufacturers are inclined to seek five-axis machining centers to meet the needs of high-efficiency, high-quality machining.

[0003] A five-axis machining center can perform machining in five degrees of freedom, including linear movement along the XYZ axes and rotational movement along the AC axes. The rotational movement along the AC axes is achieved through a rotary table. For example, the utility model disclosed in announcement number "CN218556253U" entitled "Cradle-type AC Rotary Table and Five-axis Machining Center" is a cradle-type AC rotary table, including a first A-axis rotation structure, a second A-axis rotation structure, and a C-axis rotation structure. The C-axis rotation structure includes a cradle rotary table body and a worktable. The two ends of the cradle rotary table body are rotatably connected to the first A-axis rotation structure and the second A-axis rotation structure, respectively. The worktable is rotatably mounted on the cradle rotary table body, and the cradle rotary table body can drive the worktable to rotate around the C-axis. The first A-axis rotation structure includes a first A-axis rotation assembly, which includes a first disc tailstock, a first A-axis worm gear assembly, a first rotary bearing, and a first A-axis drive motor. The second A-axis rotation structure is identical in structure to the first A-axis rotation structure and is arranged in mirror image along the C-axis rotation structure. Although it can realize the rotation of the cradle rotary table body, it includes transmission components such as worm gear assemblies, which is not only complex in structure and large in size, but also has low transmission efficiency, low working accuracy, and makes it difficult to guarantee machining quality. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to provide a high-precision CNC rotary table structure that is rationally and ingeniously designed, small in size, has good working stability, and effectively improves working accuracy.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A high-precision CNC rotary table structure includes a swing arm, an A-axis main end DD motor, an A-axis secondary end DD direct drive motor, a C-axis DD direct drive motor, a C-axis bearing housing, a turntable, an A-axis main housing, an A-axis secondary housing, an A-axis main spindle, and an A-axis secondary spindle. The swing arm has a C-axis cavity at its center, and its two ends extend symmetrically upwards to form a main support arm and a secondary support arm, respectively. The C-axis bearing housing is disposed within the C-axis cavity. The turntable is disposed at the opening of the C-axis bearing housing via a C-axis bearing. The C-axis DD direct drive motor is disposed within the C-axis bearing housing and can drive the turntable to rotate. The A-axis main spindle and A-axis secondary spindle are respectively disposed at the openings of the A-axis main housing and A-axis secondary housing via A-axis bearings and are connected to the main support arm and secondary support arm, respectively. The A-axis main end DD motor and A-axis secondary end DD direct drive motor are respectively disposed within the A-axis main housing and A-axis secondary housing and can respectively drive the A-axis main spindle and A-axis secondary spindle to rotate.

[0007] In a preferred embodiment of this invention, the swing arm has a hollow structure. This effectively reduces the weight of the swing arm, lowers the inertia of the turntable during rotation, and improves response speed and dynamic performance.

[0008] As a preferred embodiment of this utility model, the ends of the main support arm and the auxiliary support arm are provided with mounting flanges to facilitate fixing to the A-axis main shaft or the A-axis auxiliary shaft.

[0009] In a preferred embodiment of this invention, the tail end of the A-axis main housing is provided with a main end fixing ring capable of positioning the A-axis main DD motor within it, and the main end fixing ring is provided with a main end connector for connecting to the A-axis main DD motor. The tail end of the A-axis secondary housing is provided with a secondary end fixing ring capable of positioning the A-axis secondary DD direct drive motor within it, and the secondary end fixing ring is provided with a secondary end connector for connecting to the A-axis secondary DD direct drive motor. The main end fixing ring and the secondary end fixing ring ensure accurate positioning of the main and secondary DD motors within the A-axis main housing and A-axis secondary housing, respectively, preventing motor misalignment or loosening during rotation. The addition of the main end connector and the secondary end connector facilitates electrical connection with the control system, reducing wiring difficulty and failure rate.

[0010] As a preferred embodiment of this utility model, the bottom surface of the C-axis bearing housing is provided with a C-axis connector that connects to the C-axis DD direct drive motor, which facilitates electrical connection with the control system and reduces wiring difficulty and failure rate.

[0011] In a preferred embodiment of this invention, the bottom surface of the C-axis cavity is provided with a window, and a C-axis cover plate is provided to close the window. The addition of the window facilitates daily inspection and maintenance. The C-axis cover plate can close the window to prevent dust, moisture, and other impurities from entering the C-axis cavity, protecting the internal components from damage.

[0012] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonably designed. It directly uses a C-axis DD direct drive motor to drive the turntable to rotate, and uses a main A-axis DD motor and a secondary A-axis DD direct drive motor to drive the swing arm to swing. This greatly simplifies the traditional turntable structure and eliminates the problems of low transmission efficiency and low working accuracy caused by traditional worm gear transmission. It has the advantages of high working accuracy, fast response, large torque, low noise and low vibration. In addition, the overall structure is compact, small in size, easy to install, and conducive to widespread application. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is an exploded structural diagram of the present invention.

[0015] Figure 3 This is a schematic diagram of the full cross-section of the present invention.

[0016] Figure 4 This is a schematic diagram of the installation structure of this utility model. Detailed Implementation

[0017] Example: See Figure 1 , Figure 2 and Figure 3 This utility model provides a high-precision CNC rotary table structure, which includes a rocker arm 1, an A-axis main DD motor 2, an A-axis secondary DD direct drive motor 3, a C-axis DD direct drive motor 4, a C-axis bearing housing 5, a turntable 6, an A-axis main housing 7, an A-axis secondary housing 8, an A-axis main spindle 9, and an A-axis secondary spindle 10. The DD direct drive motor has advantages such as high precision, fast response, compact structure, and easy installation. Because it is directly driven by a DD direct drive motor without mechanical transmission, the measurement accuracy of the encoder can be achieved. Servo tuning can be customized according to the machine tool manufacturer's requirements to achieve a very high servo response. Furthermore, the DD direct drive motor has high control precision, resulting in high positioning accuracy and effectively ensuring that the rocker arm can rotate smoothly and accurately during operation. It has advantages such as high working precision, fast response, large torque, low noise, and low vibration.

[0018] The swing arm 1 is preferably a hollow structure. This effectively reduces the weight of the swing arm 1, lowers the inertia of the turntable during rotation, and improves response speed and dynamic performance. A C-axis cavity 11 is provided in the middle of the swing arm 1, and the two ends extend upwards obliquely and symmetrically to form a main support arm 12 and a secondary support arm 13. Mounting flanges are provided at the ends of the main support arm 12 and the secondary support arm 13 for easy fixing to the A-axis main shaft 9 or the A-axis secondary shaft 10. The A-axis main shaft 9 and the A-axis secondary shaft 10 are respectively set at the opening positions of the A-axis main housing 7 and the A-axis secondary housing 8 through A-axis bearings 16, and are respectively connected to the main support arm 12 and the secondary support arm 13. The A-axis main end DD motor 2 and the A-axis secondary end DD direct drive motor 3 are respectively set in the A-axis main housing 7 and the A-axis secondary housing 8, and can respectively drive the A-axis main shaft 9 and the A-axis secondary shaft 10 to rotate. Preferably, a main end retaining ring 14 is provided at the tail end of the A-axis main housing 7 to position the A-axis main DD motor 2 within it. The main end retaining ring 14 is provided with a main end connector for connecting to the A-axis main DD motor 2. A secondary end retaining ring 15 is provided at the tail end of the A-axis secondary housing 8 to position the A-axis secondary DD direct drive motor within it. The secondary end retaining ring 15 is provided with a secondary end connector for connecting to the A-axis secondary DD direct drive motor. The main end retaining ring 14 and the secondary end retaining ring 15 ensure accurate positioning of the A-axis main DD motor 2 and the A-axis secondary DD direct drive motor 3 within the A-axis main housing 7 and A-axis secondary housing 8, respectively, preventing motor misalignment or loosening during rotation. The addition of the main end connector and the secondary end connector facilitates electrical connection with the control system, reducing wiring difficulty and failure rate.

[0019] The C-axis bearing housing 5 is located within the C-axis cavity 11. The turntable 6 is positioned at the opening of the C-axis bearing housing 5 via a C-axis bearing 17. The C-axis DD direct drive motor 4 is located within the C-axis bearing housing 5 and drives the turntable 6 to rotate. A C-axis connector for connecting to the C-axis DD direct drive motor 4 is located on the bottom surface of the C-axis bearing housing 5, facilitating electrical connection with the control system and reducing wiring difficulty and failure rate. A window is located on the bottom surface of the C-axis cavity 11, and a C-axis cover plate 18 is provided to close the window. The window facilitates daily inspection and maintenance. The C-axis cover plate 18 can close the window to prevent dust, moisture, and other impurities from entering the C-axis cavity 11, protecting internal components from damage.

[0020] During installation, please refer to Figure 4The A-axis main housing 7 and A-axis secondary housing 8 are mounted on the base 19. During operation, this invention directly uses the C-axis DD direct drive motor 4 to drive the turntable 6 to rotate, and uses the A-axis main end DD motor 2 and the A-axis secondary end DD direct drive motor 3 in combination to drive the swing arm 1 to swing. This greatly simplifies the traditional worm gear transmission structure, effectively eliminating the problems of low transmission efficiency and low working accuracy caused by traditional worm gear transmission, resulting in good working stability.

[0021] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. As described in the above embodiments of this utility model, other structures obtained by using the same or similar structures are all within the protection scope of this utility model.

Claims

1. A high-precision CNC rotary table structure, comprising a swing arm, characterized in that, It also includes an A-axis main end DD motor, an A-axis secondary end DD direct drive motor, a C-axis DD direct drive motor, a C-axis bearing housing, a turntable, an A-axis main housing, an A-axis secondary housing, an A-axis main shaft, and an A-axis secondary shaft. The swing arm has a C-axis cavity in the middle, and the two ends extend upwards obliquely and symmetrically to form a main support arm and a secondary support arm, respectively. The C-axis bearing housing is set in the C-axis cavity. The turntable is set in the opening position of the C-axis bearing housing through the C-axis bearing. The C-axis DD direct drive motor is set in the C-axis bearing housing and can drive the turntable to rotate. The A-axis main shaft and the A-axis secondary shaft are respectively set in the opening positions of the A-axis main housing and the A-axis secondary housing through the A-axis bearing, and are respectively connected to the main support arm and the secondary support arm. The A-axis main end DD motor and the A-axis secondary end DD direct drive motor are respectively set in the A-axis main housing and the A-axis secondary housing, and can respectively drive the A-axis main shaft and the A-axis secondary shaft to rotate.

2. The high-precision CNC rotary table structure according to claim 1, characterized in that, The swing arm has a hollow structure.

3. The high-precision CNC rotary table structure according to claim 1, characterized in that, The main support arm and the auxiliary support arm are equipped with mounting flanges at their ends.

4. The high-precision CNC rotary table structure according to any one of claims 1-3, characterized in that, The tail end of the A-axis main housing is provided with a main end fixing ring that can position the A-axis main end DD motor inside it, and the main end fixing ring is provided with a main end connector that connects to the A-axis main end DD motor.

5. The high-precision CNC rotary table structure according to any one of claims 1-3, characterized in that, The tail end of the A-axis sub-housing is provided with a sub-end fixing ring that can position the A-axis sub-end DD direct drive motor within it, and the sub-end fixing ring is provided with a sub-end connector that connects to the A-axis sub-end DD direct drive motor.

6. The high-precision CNC rotary table structure according to any one of claims 1-3, characterized in that, The bottom surface of the C-axis bearing housing is provided with a C-axis connector for connecting to the C-axis DD direct drive motor.

7. The high-precision CNC rotary table structure according to any one of claims 1-3, characterized in that, The bottom surface of the C-axis cavity is provided with a window, and a C-axis cover plate is provided to close the window.

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