Internal thread grinding machine

Abstract

The application provides an internal thread grinding machine tool, which comprises a rotary clamping mechanism arranged on a workbench, grinding devices arranged on the left and right sides of the rotary clamping mechanism and moving along the transverse and longitudinal directions, at least one grinding device comprising at least three different carrier stations which are switched by movement, the carrier stations can be switched by rotation of the carrier in the horizontal direction, the carrier stations comprise a rough grinding wheel station and a fine grinding wheel station respectively provided with a rough grinding wheel and a fine grinding wheel, the carrier is further provided with a calibration station provided with a calibration device, the calibration device is mounted on the carrier through a connecting plate extending outward from the carrier, and the carrier is provided with horizontal rotation driving devices rotating in the horizontal direction. The equipment provided by the application integrates multiple different carrier stations, and automatic conversion of multiple different carrier stations in one grinding equipment can be realized, so that the grinding efficiency and the grinding quality are improved.

Description

Technical Field

[0001] This application relates to the field of metal cutting machine tools, and more particularly to an internal thread grinding machine tool. Background Technology

[0002] Internal thread grinding machines are key equipment for precision thread machining, primarily used for the precision processing of important thread gauges and parts such as thread measuring tools, thread tools, and lead screws. With the increasing demand for machining complex internal thread parts in high-precision fields such as aerospace, artificial intelligence, medical devices, and precision instruments, higher requirements are being placed on the machining accuracy, efficiency, and automation level of internal thread grinding machines. Especially in the field of humanoid robots, the machining quality of planetary roller screws directly affects the performance of humanoid robots. The internal thread machining requirements for planetary roller screws are extremely high, and the urgent needs for humanoid robot performance and mass production have placed new and higher demands on internal thread grinding technology and equipment.

[0003] Current technology typically uses a single grinding head on a single grinding machine to perform internal thread grinding on the workpiece. This method, lacking differentiation in machining precision, suffers from low grinding accuracy and efficiency. Existing technology also employs two internal thread grinding machines to perform roughing and finishing processes separately. The workpiece needs to be disassembled from the first grinding machine and then mounted on the second for finishing. This method not only requires adjusting the machining position but also leads to loss of accuracy during the disassembly and reassembly process, consuming significant time and resulting in a substantial reduction in processing efficiency. Utility Model Content

[0004] This application provides an internal thread grinding machine tool to solve the problems of low grinding efficiency, low grinding accuracy, and poor effect in the grinding process of internal threads of lead screw nuts.

[0005] Specifically, the following technical solutions are included:

[0006] This application provides an internal thread grinding machine tool, including a rotary clamping mechanism disposed on a worktable. Grinding devices that move laterally and longitudinally are respectively disposed on the left and right sides of the rotary clamping mechanism. The grinding devices are disposed on a platform located on one side of the worktable. At least one of the platforms includes at least three different platform positions that can be switched by movement. The platform positions are switched by rotating the platform in the horizontal direction. The platform positions include a coarse grinding wheel position and a fine grinding wheel position, which are respectively mounted with a coarse grinding wheel and a fine grinding wheel. The platform is also equipped with a calibration position equipped with a calibration device. The calibration device is mounted on the platform via a connecting plate extending outward from the platform. The platform is provided with a horizontal rotary drive device that rotates in the horizontal direction and is mounted on the platform.

[0007] Optionally, the horizontal rotation drive device includes a horizontal rotation drive motor and a rotation support, wherein the rotation support is connected to the horizontal rotation drive motor via a transmission device.

[0008] Optionally, the rotating support is connected to the platform via a station support, which is a ring-shaped guide rail or a rotating shaft disposed on the platform.

[0009] Optionally, the horizontal rotation drive motor is provided with an output shaft, and one end of the output shaft is provided with an output shaft gear for driving the rotation support.

[0010] Optionally, the rotary support is disc-shaped and has a gear on its outer circumference that meshes with the output shaft gear.

[0011] Optionally, the platform is connected to a guide rail arranged in the transverse direction, and is also connected to a guide rail arranged in the longitudinal direction via the transverse guide rail; or, the platform is connected to a guide rail arranged in the longitudinal direction, and is also connected to a guide rail arranged in the transverse direction via the longitudinal guide rail.

[0012] Optionally, the grinding devices on both sides of the worktable include coarse grinding wheels and fine grinding wheels that can be switched by rotation.

[0013] Optionally, the platform stations located on the same platform are perpendicular to each other, and the platform drive device is mounted on the platform.

[0014] Optionally, the calibration device includes a probe for detecting the position of the workpiece to be processed, and a reference plate for calibrating the reference position is also provided on one side of the rotary clamping mechanism.

[0015] Optionally, the reference plate is disposed on a base located on one side of the rotary clamping mechanism.

[0016] The internal thread grinding machine tool provided in this application includes a rotary clamping mechanism mounted on a worktable. Grinding devices that move laterally and longitudinally are respectively arranged on the left and right sides of the rotary clamping mechanism. Each grinding device is mounted on a platform located on one side of the worktable. At least one grinding device includes at least three different workstations that can be switched by movement. The workstations are switched by rotating the platform in the horizontal direction. Each workstation includes a coarse grinding wheel workstation and a fine grinding wheel workstation, respectively equipped with a coarse grinding wheel and a fine grinding wheel. The platform also has a calibration workstation equipped with a calibration device, which is mounted on the platform via a connecting plate extending outward from the platform. The platform is equipped with a horizontal rotary drive device that rotates in the horizontal direction, and the horizontal rotary drive device is mounted on the platform. This application achieves continuous seamless processing of rough grinding, fine grinding, and other processes by integrating a multi-station automatic conversion mechanism into a single machine tool, avoiding repeated clamping of the workpiece, significantly shortening the processing cycle, and improving efficiency. Automated station switching ensures the consistency of the spindle reference, effectively maintaining machining accuracy while simplifying the operation process and reducing labor costs. This provides an efficient and reliable solution for the flexible production of high-precision, multi-variety internal threaded parts. Furthermore, this application also includes a calibration station, which enables precise positioning of the workpiece. Compared to existing technologies that rely on preset position parameters, the direct integration of the calibration station into the grinding machine tool provides significantly improved positioning accuracy, better aligning with actual machining scenarios. The coordination of at least three stations enhances operational flexibility, further improving the accuracy of grinding the workpiece and ensuring both grinding efficiency and quality. This better meets the grinding quality and efficiency requirements for high-precision components such as planetary roller screws in the humanoid robot field. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] Figure 1 This application provides a structural schematic diagram of an internal thread grinding machine.

[0019] Figure 2 A front view of an internal thread grinding machine provided in this application;

[0020] Figure 3 A top view of an internal thread grinding machine provided in this application.

[0021] Figure label:

[0022] Rotary clamping mechanism 1;

[0023] Grinding device 2; coarse grinding wheel 21; fine grinding wheel 22;

[0024] Workbench 3;

[0025] 4. Platform; 41. Rough grinding wheel station; 42. Fine grinding wheel station; 43. Calibration station; 431. Connecting plate;

[0026] Calibration device 6; Probe 61;

[0027] Reference plate 71;

[0028] Guide rail 8.

[0029] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0031] Planetary roller screws are key components of humanoid robots, primarily used to support the joint positioning functions of the robot. For humanoid robots to achieve near-human usability and mass production, the machining quality and efficiency of planetary roller screws play a crucial role. Internal thread grinding of planetary roller screws is a critical step in their machining process. Current internal thread grinding processes use a single-grit grinding wheel to grind the workpiece multiple times to obtain a satisfactory result. However, this method suffers from low grinding accuracy due to the use of a single-grit wheel, making it difficult to meet the current requirements for high-precision internal thread workpieces. Some machining processes differentiate grinding wheels: rough grinding, fine grinding, and other processes often require different equipment, leading to repeated workpiece disassembly and transfer. This is not only inefficient but also prone to loss of reference accuracy due to repeated clamping, affecting machining consistency. Furthermore, the complex and time-consuming switching operations between different grinding stations on traditional equipment make it difficult to balance high precision and high-efficiency production, thus limiting the mass production capability of precision internal thread parts.

[0032] In view of this, this application provides an internal thread grinding machine tool. This structure integrates an automatically convertible coarse grinding wheel station and a fine grinding wheel station, each equipped with a coarse grinding wheel and a fine grinding wheel respectively, as well as a calibration station equipped with a calibration device. This implementation method avoids frequent manual loading and unloading processes during machining, improves grinding efficiency in the internal thread grinding process, and maintains consistent grinding accuracy.

[0033] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0034] Figures 1-3 This is a structural schematic diagram of the internal thread grinding machine tool provided in this application. Figures 1-3 As shown, the internal thread grinding machine tool provided in this application includes a rotary clamping mechanism 1 provided on a worktable 3. Grinding devices 2 that move in the horizontal and longitudinal directions are respectively provided on the left and right sides of the rotary clamping mechanism 1. The grinding devices 2 are provided on a platform 4 located on one side of the worktable 3. At least one platform 4 includes at least three different platform positions that can be switched by movement. The platform positions are switched by rotating the platform 4 in the horizontal direction. The platform positions include a coarse grinding wheel position 41 and a fine grinding wheel position 42, which are respectively equipped with a coarse grinding wheel 21 and a fine grinding wheel 22. The platform 4 is also equipped with a calibration position 43, which is equipped with a calibration device 6. The calibration device 6 is installed on the platform 4 through a connecting plate 431 extending outward from the platform 4. The platform 4 is provided with a horizontal rotary drive device that rotates in the horizontal direction. The horizontal rotary drive device is installed on the platform 4.

[0035] This application does not limit the specific structure of the above-mentioned rotary clamping mechanism 1. Those skilled in the art can implement it by referring to the prior art, that is, it can be any clamping mechanism that can effectively clamp the workpiece to be processed and provide it with rotational power.

[0036] The difference between the coarse grinding wheel 21 and the fine grinding wheel 22 mentioned here lies in their grit number; the coarse grinding wheel 21 has a smaller grit number, while the fine grinding wheel 22 has a larger grit number. This application does not limit the specific grit number of the fine grinding wheel 22 and the coarse grinding wheel 21, and those skilled in the art can set them according to their needs.

[0037] The aforementioned horizontal rotation drive device may be, for example, a servo motor drive or a direct drive, and this application does not limit it.

[0038] Optionally, the calibration device 6 may include, for example, a probe 61 for detecting the position of the workpiece to be processed, and also for calibrating the position of the workpiece to be processed, determining the starting point of the workpiece's operation, and identifying the position of the workpiece to be processed. The calibration probe 61 may be, for example, a contact trigger probe, a contact scanning probe, a non-contact probe, etc., and this application does not limit its type.

[0039] In this implementation, when grinding of the workpiece is required, the rotary clamping mechanism 1 is first activated to effectively clamp the workpiece and provide it with rotational power. Then, the calibration station 43 is activated to calibrate the position of the workpiece. After calibration, the rough grinding wheel station 41 is first controlled to align with the workpiece for rough grinding. After rough grinding, the horizontal rotary drive device is controlled to switch the station, and the fine grinding wheel station 42 is aligned with the workpiece for fine grinding using the fine grinding wheel 22 until the grinding of the workpiece is completed.

[0040] This application integrates a multi-station automatic switching mechanism on a single machine tool, achieving continuous and seamless processing of rough grinding, fine grinding, and other processes. This avoids repeated workpiece clamping, significantly shortens the processing cycle, and improves efficiency. Automated station switching ensures the consistency of the spindle reference, effectively maintaining machining accuracy, while simplifying the operation process and reducing labor costs. This provides an efficient and reliable solution for the flexible production of high-precision, multi-variety internal threaded parts. Furthermore, this application also includes a calibration station 43, which allows for precise positioning of the workpiece. Compared to the prior art's method of preset position parameters, the direct integration of the calibration station into the grinding machine tool provides better positioning accuracy, better suits actual processing scenarios, and the cooperation of at least three stations enhances operational flexibility. Therefore, it further improves the accuracy of grinding the workpiece, ensuring grinding efficiency while improving grinding quality.

[0041] Optionally, on one of the two platforms 4 of the internal thread grinding machine, a coarse grinding wheel station 41 including a coarse grinding wheel 21 can be provided, or a coarse grinding wheel station 41 including a coarse grinding wheel 21 and a fine grinding wheel station 42 including a fine grinding wheel 22 can be provided simultaneously. The control device can be a PLC to control the coarse grinding wheel 21 or the fine grinding wheel 22 on both sides to work simultaneously. The grinding devices 2 on both platforms 4 can be selected to move in the same direction or in opposite directions. Since the processing on both sides is a transition connection for the thread, moving in the same direction is preferred.

[0042] Optionally, in some embodiments, both sides of the platform 4 may be equipped with a coarse grinding wheel 21 or a fine grinding wheel 22 that can be rotated in the horizontal direction to enter the working position respectively. When both sides of the internal thread grinding machine platform 4 are equipped with a coarse grinding wheel station 41 and a fine grinding wheel station 42, the workpiece to be processed can be ground simultaneously from both sides, which can further improve the grinding efficiency of the workpiece to be processed. Especially when the grinding is in the same direction on both sides, for example, one grinding wheel can start grinding from one end of the workpiece to be processed, and the other grinding wheel can start grinding from the middle part of the workpiece to be processed, with both sides grinding in the same direction. This implementation method can improve grinding efficiency while ensuring grinding accuracy, and further improve grinding quality.

[0043] Optionally, in some embodiments, the horizontal rotation drive device may include, for example, a horizontal rotation drive motor and a rotation support, with the rotation support connected to the horizontal rotation drive motor via a transmission device. As mentioned above, the horizontal rotation drive motor may be, for example, a servo motor or a direct drive motor. The aforementioned rotation support is a structure used to provide support force and power transmission for the process of rotating the platform to switch platform positions. This application does not limit the type of transmission device; it can be mechanical or pneumatic transmission, and those skilled in the art can configure it according to their needs. Through this implementation, the provision and transmission of horizontal rotation drive power to the carrier can be achieved based on a simple structure, ensuring power transmission while improving the compactness of the device, thereby improving grinding stability and grinding quality.

[0044] The rotary support can be arranged parallel to the platform 4, for example. Optionally, the rotary support can be connected to the platform 4 via a station support, which can be a ring-shaped guide rail or a rotating shaft mounted on the platform 4. Since the horizontal rotary drive device can be connected to the platform through the transmission device, the rotary support, and the station support, the rotational power can be transmitted to meet the platform station switching requirements of the platform 4.

[0045] Optionally, in some embodiments, the horizontal rotary drive motor is provided with an output shaft, and one end of the output shaft is provided with an output shaft gear that can drive the rotary support. This implementation method can achieve reliable driving of the rotary support by the horizontal rotary drive motor, ensure structural compactness, and ensure effective power transmission.

[0046] The rotary support can be disc-shaped or other feasible geometric shapes, such as an annular shape. Its outer circumference can be provided with gears that mesh with the output shaft gear. This allows for a tight fit between the disc and the output shaft gear, ensuring that the horizontal rotary drive motor can effectively drive the rotary support.

[0047] Optionally, in some embodiments, the grinding devices 2 on both sides of the worktable 3 may each include a coarse grinding wheel 21 and a fine grinding wheel 22 that can be switched by rotation. In this implementation, after the control device controls the coarse grinding wheels 21 on both sides to complete the coarse grinding process synchronously, it controls the table on both sides to switch the table position to the fine grinding wheel position 42, and then the fine grinding wheels 22 on both sides perform fine grinding respectively.

[0048] Alternatively, one side may include both a coarse grinding wheel 21 and a fine grinding wheel 22 that can be switched, while the other side may only include a coarse grinding wheel 21. In this implementation, the control device controls the coarse grinding wheels 21 on both sides to complete the coarse grinding, and then controls the stage on one side to switch to the fine grinding wheel station 42. Then, the fine grinding wheel 22 on that side completes the fine grinding of the entire workpiece from one end to the other.

[0049] Optionally, the platform stations located on the same platform 4 can be perpendicular to each other or at other angles; this application does not limit them. The platform drive device can, for example, be mounted on the platform 4.

[0050] Optionally, in some embodiments, the platform 4 can be directly connected to the guide rail 8 arranged in the transverse direction, or connected via the guide rail 8 arranged in the transverse direction and the guide rail 8 arranged in the longitudinal direction; or the platform 4 can be as follows: Figure 1 The table 4 is directly connected to the longitudinally arranged guide rail 8, and this application does not limit the connection via both longitudinally and transversely arranged guide rails 8. Based on this, the table 4 is connected to a table drive device that can drive the table 4 to move both transversely and longitudinally, and the table drive device is mounted on the table 4. The table drive device can be a servo motor or a direct drive motor. Driving the table 4 to move laterally allows for horizontal alignment of the workpiece, while driving the table 4 to move longitudinally allows for longitudinal alignment of the workpiece. This implementation improves the flexibility of table 4 control, achieves more precise alignment of the workpiece, and enhances machining accuracy and quality.

[0051] Optionally, a reference plate 71 for calibrating the reference position is also provided on one side of the rotary clamping mechanism 1. This implementation further improves the accuracy of workpiece positioning, thereby enhancing machining precision and quality. Optionally, the reference plate 71 can be mounted on a base located on one side of the rotary clamping mechanism 1. Mounting the reference plate 71 on the base reduces the space occupied by grinding stations and other areas, improving layout rationality and machine tool usability.

[0052] Optionally, in some embodiments, the internal thread grinding machine tool may also be equipped with dressing discs, including a roughing dressing disc and a fine dressing disc, for dressing the roughing grinding wheel 21 and the fine grinding wheel 22. The following example illustrates the workflow of the internal thread grinding machine tool provided in this application, using an internal thread grinding machine tool that includes a roughing dressing disc and a fine dressing disc, where the workpiece to be processed has a three-start thread, one side of the grinding wheel consists of a roughing grinding wheel and a fine grinding wheel, and the other side of the grinding wheel is a roughing grinding wheel. Optionally, in some embodiments, after the rotating clamping mechanism 1 clamps the workpiece, the processing steps of the internal thread grinding machine tool are as follows:

[0053] 1. Rotate the stage 4 to rotate the probe 61 assembly to the working position. First, calibrate the probe 61 through the reference plate 71, and then use the probe 61 to strike the end face of the workpiece to determine the starting point of the workpiece grinding.

[0054] 2. The grinding head of the coarse grinding wheel 21 rotates to the working position, and the grinding heads of the left and right coarse grinding wheels 21 move to the corresponding coarse grinding dressing discs 51, where the corresponding coarse grinding dressing discs 51 dress the grinding heads of the coarse grinding wheels 21. The control device calculates the shape of the grinding wheel through an algorithm, and then controls the coarse grinding wheel 21 to move along the X and Z axes, thereby realizing the interpolation dressing of the coarse grinding wheel 21 based on the coarse grinding dressing discs 51, and dressing the contour of the coarse grinding wheel 21.

[0055] 3. The right coarse grinding wheel 21 moves to the initial machining position of the workpiece, and the left coarse grinding wheel 21 moves to the middle position of the workpiece.

[0056] (1) The left coarse grinding wheel 21 first moves rapidly into the middle of the workpiece. Then, the left and right coarse grinding wheels 21 together slowly cut into the predetermined depth;

[0057] (2) Then the left coarse grinding wheel 21 retracts, while the right coarse grinding wheel 21 begins to enter the grinding process. The two move synchronously to achieve the grinding effect based on the following... Figure 1 Interpolation motion in the Z-axis and C-axis (rotation axis direction of rotary clamping mechanism 1) directions shown;

[0058] (3) When the right coarse grinding wheel 21 arrives at the starting point where the left coarse grinding wheel 21 is located, the left coarse grinding wheel 21 has completed the thread grinding of the left half.

[0059] (4) The right coarse grinding wheel 21 continues to feed one pitch, completely covering the joint of the left and right coarse grinding wheels 21;

[0060] (5) Grinding is complete.

[0061] 4. When the workpiece reaches the predetermined position, the coarse grinding wheels 21 on the left and right sides feed along the X and Z axes. The rotary clamping mechanism 1 rotates with the C axis as the rotation axis. The three-axis interpolation is performed. The coarse grinding wheels 21 grind to the predetermined depth (cut depth) through one pitch, and then the grinding begins.

[0062] Note that since the coarse grinding wheel 21 on the left starts grinding from the middle of the workpiece, if it is fed directly in the transverse direction (workpiece radial direction), the coarse grinding wheel 21 will directly penetrate into the workpiece to the predetermined depth, which may cause damage to the grinding wheel and leave a mark at the cutting position. Therefore, it is necessary to start grinding by slowly cutting into the workpiece to reach the predetermined depth.

[0063] 5. During the grinding process, thread grinding is achieved through the interpolation motion of the C-axis and Z-axis. For every 360° rotation of the C-axis, the rough grinding wheel 21 advances one thread pitch in the Z-axis machining direction.

[0064] 6. After the thread is ground to the first depth of cut, the rough grinding wheel 21 returns to the initial machining position. Repeat steps 4, 5, and 6 until the thread is ground to the predetermined depth.

[0065] If the grinding wheel is single-toothed, both the roughing grinding wheel 21 and the fine grinding wheel 22 can be multi-toothed grinding wheels, with the number of tooth protrusions on both wheels equal to the number of pitch heads on the workpiece. The fine grinding wheel 22 is a bent-bar grinding head.

[0066] 7. After grinding one thread, the two coarse grinding wheels 21 return to their initial machining positions. The C-axis, where the rotating clamping mechanism 1 is located, first returns to its initial positioning position. Then the C-axis rotates 120° and positions itself to the second thread position (as mentioned above, the internal thread consists of three threads), and steps 4, 5, 6, and 7 are repeated.

[0067] 8. After the second thread is ground, the two rough grinding wheels 21 return to their initial machining positions. The C-axis, where the rotating clamping mechanism 1 is located, returns to its initial positioning position. Then the C-axis rotates 120° to position itself at the third thread, and steps 4, 5, 6, and 7 are repeated.

[0068] 9. After the three-thread grinding is completed, the two rough grinding wheels 21 return to their initial machining positions. The C-axis returns to its initial positioning position.

[0069] 10. By rotating the stage 4, the fine grinding wheel 22 is switched to the working position. Through the interpolation motion of the X-axis and Z-axis, the fine grinding dressing disc wheel 52 dresses the fine grinding wheel 22 to the predetermined shape.

[0070] 11. After dressing, the fine grinding wheel 22 moves to the initial machining position, and then performs internal thread grinding through the interpolation motion of the C-axis and Z-axis. For every 360° rotation of the C-axis, the Z-axis advances by one thread pitch. The fine grinding wheel 22 completes the fine grinding of the internal thread of the entire workpiece from right to left.

[0071] 12. After the thread is ground to the first depth of cut, the fine grinding wheel 22 returns to the initial machining position and advances the X-axis by one grinding depth to perform the second depth of cut grinding of the thread raceway until the fine thread raceway is finely ground to the required dimensions.

[0072] 13. After grinding the first thread, the fine grinding wheel 22 is returned to the initial machining position, the C-axis returns to the initial positioning position, and then the C-axis is rotated 120° to perform fine grinding of the second thread, until all three threads are ground to the required dimensions.

[0073] It should be noted that the above grinding process is only an exemplary embodiment with a 3-threaded workpiece as an example. In the actual grinding process, the workpiece can be a workpiece with any number of threads. Grinding of different types of workpieces can be achieved by setting different processing parameters.

[0074] Furthermore, when the workpiece to be processed has multi-start threads, the specific processing procedure can be to complete the processing of one thread before processing the other thread; or, it can be to uniformly remove the allowance for each thread at each grinding depth until each thread is ground to its proper position. This application does not limit the specific implementation method, and those skilled in the art can flexibly adjust the grinding process by setting parameters.

[0075] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0076] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An internal thread grinding machine tool, comprising a rotary clamping mechanism disposed on a worktable, and grinding devices that move laterally and longitudinally respectively disposed on the left and right sides of the rotary clamping mechanism, characterized in that, The grinding device is mounted on a platform located on one side of the worktable. At least one platform includes at least three different platform stations that can be switched by movement. The platform stations are switched by rotating the platform in the horizontal direction. The platform stations include a coarse grinding wheel station and a fine grinding wheel station, which are respectively equipped with coarse grinding wheels and fine grinding wheels. The platform is also equipped with a calibration station equipped with a calibration device. The calibration device is mounted on the platform via a connecting plate extending outward from the platform. The platform is equipped with a horizontal rotation drive device that rotates in the horizontal direction and is mounted on the platform.

2. A machine tool for grinding internal threads as claimed in claim 1, characterized in that, The horizontal rotation drive device includes a horizontal rotation drive motor and a rotation support, and the rotation support is connected to the horizontal rotation drive motor through a transmission device.

3. The internal thread grinding machine tool as described in claim 2, characterized in that, The rotating support is connected to the platform via a station support, which is either a ring-shaped guide rail or a rotating shaft mounted on the platform.

4. The internal thread grinding machine according to claim 2, wherein The horizontal rotation drive motor is provided with an output shaft, and one end of the output shaft is provided with an output shaft gear that drives the rotation support.

5. The internal thread grinding machine tool as described in claim 4, characterized in that, The rotary support is disc-shaped and has gears on its outer circumference that mesh with the output shaft gear.

6. The internal thread grinding machine according to claim 1, wherein The platform is connected to a guide rail arranged in the transverse direction, and is also connected to a guide rail arranged in the longitudinal direction via the transverse guide rail; or, the platform is connected to a guide rail arranged in the longitudinal direction, and is also connected to a guide rail arranged in the transverse direction via the longitudinal guide rail.

7. The internal thread grinding machine according to claim 1, wherein The grinding devices on both sides of the worktable include coarse grinding wheels and fine grinding wheels that can be switched by rotation.

8. The internal thread grinding machine according to claim 1, wherein The platform stations located on the same platform are perpendicular to each other.

9. The internal thread grinding machine according to claim 1, wherein The calibration device includes a probe for detecting the position of the workpiece to be processed, and a reference plate for calibrating the reference position is also provided on one side of the rotary clamping mechanism.

10. A machine tool for grinding internal threads as claimed in claim 9, characterized in that, The reference plate is mounted on a base located on one side of the rotary clamping mechanism.

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