Whirlwind milling machine tool with high machining precision and milling method of whirlwind milling machine tool

Abstract

The invention relates to the technical field of milling, in particular to a whirlwind milling machine tool with high machining precision and a milling method of the whirlwind milling machine tool. Based on a whirlwind milling machine tool structure, the whirlwind milling machine tool comprises a rack; the hollow three-jaw chuck is rotatably connected to the rack, and the axial direction of the hollow three-jaw chuck is the X direction; the rotary driving mechanism is connected between the rack and the hollow three-jaw chuck and is used for driving the hollow three-jaw chuck to rotate; the movable seat can be movably connected to the rack in the X direction, and the movable seat is located in the X direction of the three-jaw chuck; the first linear driving mechanism is used for driving the moving seat to move; and the like; by means of the improvement, the high precision of the whirlwind milling machine tool for milling large workpieces is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of milling, in particular to a whirlwind milling machine tool with high machining accuracy and a milling method thereof. Background Art

[0002] The cyclone milling machine is used to perform milling processing on the milling part of the workpiece after rotating and clamping the workpiece. The cyclone milling machine in the prior art is generally used for milling small rotary workpieces, and cannot adapt to the milling processing of large workpieces with a diameter of more than 1m and a length of 1.5m. On the one hand, the stability of clamping and positioning is difficult to ensure, which leads to the jitter of the workpiece during the milling process and affects the processing accuracy. On the other hand, during the milling process of large workpieces, the milling cutter body will have a slight amount of wear. The prior art cannot fine-tune the position of the milling cutter according to the tool wear during real-time milling, which leads to a slight deviation in the milling depth of the post-processing part, making it difficult to adapt to the needs of high-precision milling. Summary of the invention

[0003] The technical problem to be solved by the present invention is to improve the structure of a high-precision cyclone milling machine and its milling method, so as to achieve high-precision milling of large workpieces by the cyclone milling machine.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: High-precision whirlwind milling machine, including: frame; A hollow three-jaw chuck, wherein the hollow three-jaw chuck is rotatably connected to the frame, and the axial direction of the hollow three-jaw chuck is the X direction; A first rotation driving mechanism, which is connected between the frame and the hollow three-jaw chuck and is used to drive the hollow three-jaw chuck to rotate; A movable seat, the movable seat is connected to the frame movably along the X direction, and the movable seat is located in the X direction of the three-jaw chuck; A first linear drive mechanism, wherein the first linear drive mechanism is used to drive the moving seat to move; A center frame, the center frame is connected to the movable seat, the center frame includes a middle support arm and side support arms symmetrically distributed on both sides of the middle support arm in the Y direction, and the middle support arm and the side support arm are both connected with support rollers for abutting against the outer circumference of the workpiece; An XYZ three-axis moving module, which is connected to the frame and is located in the X direction of the moving seat; A milling assembly, the milling assembly comprising a base, a mounting seat, a first telescopic driving member, a rotating cylinder, a rotating adjustment cylinder, a rotating adjustment seat, a connecting rod, a milling cutter connecting member, a milling cutter limiting seat, a milling cutter body and a second rotating driving mechanism; The base is connected to the XYZ three-axis moving module, and the mounting base is connected to the base; One end of the first telescopic driving member is connected to the mounting seat; The rotating cylinder is rotatably connected to the mounting seat through a first bearing, the axis of the first telescopic driving member coincides with the axis of the rotating cylinder, and the rotating adjustment cylinder is coaxially rotatably connected to the other end of the first telescopic driving member through a second bearing; the rotating adjustment cylinder is coaxially arranged in the rotating cylinder, and a limiting protrusion is arranged on the circumferential surface of the rotating adjustment cylinder; The rotation adjustment seat is provided with a cylindrical groove that is slidably matched with the rotation adjustment cylinder, the inner wall of the cylindrical groove is provided with a spiral limiting groove, the cylindrical groove is coaxially slidably sleeved on the rotation adjustment cylinder, and the limiting protrusion is located in the spiral limiting groove; The rotary adjustment seat and the rotating cylinder are rotatably connected via a third bearing; the third bearing is a one-way bearing; A plurality of milling cutter limit seats are connected to the end of the rotating cylinder in a circumferential array, and the milling cutter limit seat is provided with a limit groove for slidingly matching and connecting the milling cutter body; the milling cutter body is slidably connected to the limit groove, the inner end of the milling cutter body is connected to the milling cutter connecting piece, one end of the connecting rod is pivotally connected to the milling cutter connecting piece, and the other end is pivotally connected to the eccentric position of the end of the rotating adjustment seat, and the two ends of the connecting rod are pivotally connected axially parallel to the axial direction of the rotating adjustment seat; The second rotation drive mechanism is connected to the mounting seat, and the second rotation mechanism is transmission-connected to the rotating drum, and is used to drive the rotating drum to rotate; When the second rotating mechanism drives the rotating cylinder to rotate, the rotating cylinder drives the rotating adjustment seat to rotate synchronously.

[0005] Furthermore, in the above-mentioned cyclone milling machine tool structure with high machining accuracy, the supporting roller is a universal roller.

[0006] Furthermore, in the above-mentioned high-precision cyclone milling machine structure, the second rotation drive mechanism includes a drive motor, a first gear and a second gear, the drive motor is connected to the mounting seat, the first gear is transmission-connected to the output shaft of the drive motor, the second gear is coaxially sleeved on the outer wall of the rotating cylinder, and the first gear is meshed with the second gear.

[0007] Furthermore, in the above-mentioned cyclone milling machine tool structure with high machining accuracy, the limiting groove of the milling cutter limiting seat is in the shape of a rectangular parallelepiped, and the side of the milling cutter body is slidably matched with the limiting groove.

[0008] Furthermore, in the above-mentioned cyclone milling machine tool structure with high machining accuracy, the first telescopic driving component is an electric telescopic cylinder.

[0009] Furthermore, in the above-mentioned high machining precision cyclone milling machine structure, the mounting seat is pivotally connected to the base, and also includes a second telescopic driving member, one end of the second telescopic driving member is pivotally connected to the base, and the other end is pivotally connected to the mounting seat.

[0010] Furthermore, in the above-mentioned cyclone milling machine tool structure with high machining accuracy, the second telescopic driving component is an electric telescopic cylinder.

[0011] The present invention also relates to a milling method of the above-mentioned whirlwind milling machine with high machining accuracy, comprising the following steps: The outer wall of a large cylindrical rotating workpiece near one end is clamped on a hollow three-jaw chuck for positioning; The first linear drive mechanism drives the moving seat to move, and controls the middle support arm and the side support arm of the center frame to move, so that each support roller abuts against the outer wall of the large cylindrical rotating workpiece; Control the XYZ three-axis moving module to drive the milling cutter body of the milling assembly to move to the position that contacts the inner wall of the large cylindrical rotating workpiece and needs to be milled; Control the first linear drive mechanism to drive the moving seat to move, so that the center frame moves to the position where the milling cutter body is located; The rotary drive mechanism is controlled to drive the hollow three-jaw chuck to rotate, thereby driving the large cylindrical rotating workpiece to rotate, and the second rotary drive mechanism is controlled to drive the rotating cylinder to rotate, driving the milling cutter body to rotate, and milling the inner wall of the large cylindrical rotating workpiece; During the milling process, the XYZ three-axis moving module is controlled to feed and move along the X axis, and at the same time, the first linear drive mechanism is controlled to drive the moving seat to feed and move synchronously along the X axis; so that the milling cutter body and each supporting roller are always located in the same vertical plane; The first telescopic drive member is controlled to extend and move according to the wear rate of the milling cutter body, so that the limiting protrusion slides in the spiral limiting groove, driving the rotary adjustment seat to rotate in the opposite direction relative to the rotating cylinder, so that the connecting rod drives the milling cutter body to move outward along the limiting groove to offset the wear of the milling cutter.

[0012] Further, the first telescopic driving member is controlled to extend and move according to the wear rate of the milling cutter body, so that the limiting protrusion slides in the spiral limiting groove, drives the rotary adjustment seat to rotate in the opposite direction relative to the rotating cylinder, and drives the connecting rod to move the milling cutter body outward along the limiting groove to offset the wear of the milling cutter. Specifically: By establishing a machine learning model, the material property parameters, environmental parameters and milling processing parameters of a large cylindrical rotating workpiece are used as input data, and the wear rate of the milling cutter body is used as label data. The machine learning model is trained through multiple training samples. Before milling, the material property parameters, environmental parameters and milling processing parameters of the large cylindrical rotating workpiece are input into the trained machine learning model, and the corresponding wear rate value is output. The rate value of the extension movement of the first telescopic drive member is calculated according to the wear rate value of the milling cutter body, and the extension movement of the first telescopic drive member is controlled to make the limiting protrusion slide in the spiral limiting groove, drive the rotating adjustment seat to rotate in the opposite direction relative to the rotating cylinder, and make the connecting rod drive the milling cutter body to move outward along the limiting groove to offset the wear of the milling cutter. The material property parameters include the material, hardness, thermal conductivity, elongation and surface roughness of the workpiece; the milling processing parameters include the rotation speed, torque, feed amount and milling depth of the milling cutter body; the environmental parameters include ambient humidity and ambient temperature.

[0013] Furthermore, the machine learning model is specifically a deep neural network model.

[0014] The beneficial effects of the present invention are: by rotating the hollow three-jaw chuck connected on the frame, and by moving the center frame connected to the frame through the moving seat, through the mutual cooperation of the center frame and the hollow three-jaw chuck, a large cylindrical rotating workpiece can be clamped more stably; the large cylindrical rotating workpiece can be enabled to achieve stable self-rotation, and the milling component structure with a specific structure is connected through the XYZ three-axis moving module. When performing cyclonic milling, the milling component can drive the milling cutter body to extend to any position on the inner wall of the large cylindrical rotating workpiece, which is suitable for milling processing needs at various angles. During the milling process, due to the provision of the moving seat structure, the feed of the moving seat and the milling cutter body can be moved synchronously during milling, so that the milling cutter body and each supporting roller are always located in the same vertical plane; the processing point of the milling cutter body is always stably supported by the supporting rollers, thereby better ensuring the processing accuracy. In the milling assembly structure, the first telescopic driving member is extended at a corresponding rate according to the tool wear rate, and the rotary adjustment seat is slightly rotated relative to the outer rotating cylinder through the sliding cooperation of the spiral limiting groove and the limiting protrusion, thereby driving the milling cutter body to move outward a small distance through the connecting rod, thereby offsetting the tool wear and ensuring the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a whirlwind milling machine tool with high machining accuracy according to a specific embodiment of the present invention; Figure 2 It is a structural schematic diagram of a center frame of a high-precision whirlwind milling machine tool according to a specific embodiment of the present invention when it is working on a large cylindrical rotating workpiece; Figure 3 It is a structural schematic diagram of a milling assembly of a whirlwind milling machine tool with high machining accuracy according to a specific embodiment of the present invention from a first perspective; Figure 4 for Figure 3 A magnified view of part A; Figure 5 It is a structural schematic diagram of a milling assembly of a whirlwind milling machine tool with high machining accuracy according to a specific embodiment of the present invention from a second perspective; Figure 6 It is a structural schematic diagram of a milling assembly of a whirlwind milling machine tool with high machining accuracy according to a specific embodiment of the present invention from a third perspective; Figure 7 for Figure 6 BB-direction cross-sectional diagram; Description of labels: 1. Frame; 2. Hollow three-jaw chuck; 3. Mobile seat; 4. Center frame; 41. Middle support arm; 42. Side support arm; 43. Support roller; 5. XYZ three-axis mobile module; 6. Milling assembly; 61. Base; 62. Mounting seat; 63. First telescopic drive member; 64. Rotating cylinder; 65. Rotating adjustment cylinder; 651. Position-limiting protrusion; 66. Rotating adjustment seat; 661. Cylindrical groove; 662. Spiral position-limiting groove; 67. Connecting rod; 68. Milling cutter connecting member; 69. Milling cutter position-limiting seat; 691. Position-limiting groove; 610. Milling cutter body; 611. Second rotating drive mechanism; 6111. Driving motor; 6112. First gear; 6113. Second gear; 612. First bearing; 613. Second bearing; 614. Third bearing; 615. Second telescopic drive member; 7. Large cylindrical rotating workpieces. DETAILED DESCRIPTION

[0016] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0017] Please refer to Figures 1 to 7 The specific implementation of the present invention relates to a whirlwind milling machine tool with high machining accuracy, comprising: Rack 1; A hollow three-jaw chuck 2, wherein the hollow three-jaw chuck 2 is rotatably connected to the frame 1, and the axial direction of the hollow three-jaw chuck 2 is the X direction; A first rotary drive mechanism, which is connected between the frame 1 and the hollow three-jaw chuck 2 and is used to drive the hollow three-jaw chuck 2 to rotate; A movable seat 3, wherein the movable seat 3 is movably connected to the frame 1 along the X direction, and the movable seat 3 is located in the X direction of the three-jaw chuck; A first linear drive mechanism, wherein the first linear drive mechanism is used to drive the moving seat 3 to move; A center frame 4, the center frame 4 is connected to the movable seat 3, the center frame 4 includes a middle support arm 41 and side support arms 42 symmetrically distributed on both sides of the middle support arm 41 in the Y direction, and the middle support arm 41 and the side support arm 42 are both connected with support rollers 43 for abutting against the outer circumference of the workpiece; An XYZ three-axis moving module 5, wherein the XYZ three-axis moving module 5 is connected to the frame 1 and is located in the X direction of the moving seat 3; The milling assembly 6 includes a base 61, a mounting seat 62, a first telescopic driving member 63, a rotating cylinder 64, a rotating adjustment cylinder 65, a rotating adjustment seat 66, a connecting rod 67, a milling cutter connecting member 68, a milling cutter limiting seat 69, a milling cutter body 610 and a second rotating driving mechanism 611; The base 61 is connected to the XYZ three-axis moving module 5, and the mounting base 62 is connected to the base 61; One end of the first telescopic driving member 63 is connected to the mounting seat 62; The rotating cylinder 64 is rotatably connected to the mounting seat 62 via the first bearing 612, the axis of the first telescopic driving member 63 coincides with the axis of the rotating cylinder 64, and the rotating adjustment cylinder 65 is coaxially rotatably connected to the other end of the first telescopic driving member 63 via the second bearing 613; the rotating adjustment cylinder 65 is coaxially arranged in the rotating cylinder 64, and a limiting protrusion 651 is arranged on the circumferential surface of the rotating adjustment cylinder 65; The rotation adjustment seat 66 is provided with a cylindrical groove 661 that is slidably matched with the rotation adjustment cylinder 65. The inner wall of the cylindrical groove 661 is provided with a spiral limiting groove 662. The cylindrical groove 661 is coaxially slidably sleeved on the rotation adjustment cylinder 65, and the limiting protrusion 651 is located in the spiral limiting groove 662. The rotating adjustment seat 66 and the rotating cylinder 64 are rotatably connected via a third bearing 614; the third bearing 614 is a one-way bearing; A plurality of milling cutter stop seats 69 are connected to the end of the rotating cylinder 64 in a circumferential array, and the milling cutter stop seat 69 is provided with a stop slot 691 for slidingly matching and connecting the milling cutter body 610; the milling cutter body 610 is slidably connected to the stop slot 691, and the inner end of the milling cutter body 610 is connected to the milling cutter connecting piece 68, one end of the connecting rod 67 is pivotally connected to the milling cutter connecting piece 68, and the other end is pivotally connected to the eccentric position of the end of the rotating adjustment seat 66, and the two ends of the connecting rod 67 are pivotally connected axially parallel to the axial direction of the rotating adjustment seat 66; The second rotation drive mechanism 611 is connected to the mounting seat 62, and the second rotation mechanism is in transmission connection with the rotating cylinder 64, and is used to drive the rotating cylinder 64 to rotate; When the second rotating mechanism drives the rotating cylinder 64 to rotate, the rotating cylinder 64 drives the rotating adjustment seat 66 to rotate synchronously.

[0018] Reference Figure 1 A set of XYZ three-axis moving modules 5 can also be set on the X-direction reverse side of the hollow three-jaw chuck 2. The XYZ three-axis moving module 5 is also connected to a milling component 6 for milling the X-direction reverse end of the large cylindrical rotating workpiece 7.

[0019] In the above structure, the hollow three-jaw chuck 2 and the center frame 4 are both existing structures, so their specific internal structures and working principles are no longer described in detail. The hollow three-jaw chuck 2 can center and clamp the outer wall of the large cylindrical rotating workpiece 7, and the center frame 4 can perform rolling centering positioning on the large cylindrical rotating workpiece 7, so that the rotary drive mechanism can drive the hollow three-jaw chuck 2 to rotate, thereby driving the large cylindrical rotating workpiece 7 to rotate stably along its axial direction.

[0020] In the above structure, since the third bearing 614 is a one-way bearing, when the second rotation drive mechanism 611 drives the rotating cylinder 64 to rotate, the inner rotation adjustment seat 66, due to the non-return effect of the one-way bearing, makes the rotating cylinder 64 drive the rotation adjustment seat 66 to rotate synchronously, that is, the two do not rotate relative to each other. When the first telescopic drive member 63 is extended, the limiting protrusion 651 slides in the spiral limiting groove 662, so that the rotation adjustment seat 66 and the rotating cylinder 64 rotate relative to each other at a certain angle through the one-way bearing, thereby driving the milling cutter body 610 to move a short distance outward along the milling cutter limiting seat 69 through the transmission of the connecting rod 67, thereby offsetting the wear of the milling cutter body 610.

[0021] Preferably, the supporting roller 43 is a universal roller.

[0022] Preferably, the second rotating drive mechanism 611 includes a driving motor 6111, a first gear 6112 and a second gear 6113, the driving motor 6111 is connected to the mounting seat 62, the first gear 6112 is drivingly connected to the output shaft of the driving motor 6111, the second gear 6113 is coaxially sleeved on the outer wall of the rotating cylinder 64, and the first gear 6112 is meshed with the second gear 6113.

[0023] Preferably, the limiting groove 691 of the milling cutter limiting seat 69 is in the shape of a rectangular parallelepiped, and the side of the milling cutter body 610 is slidably matched with the limiting groove 691 .

[0024] Preferably, the first telescopic driving member 63 is an electric telescopic cylinder.

[0025] Preferably, the mounting seat 62 is pivotally connected to the base 61, and further comprises a second telescopic driving member 615, one end of the second telescopic driving member 615 is pivotally connected to the base 61, and the other end is pivotally connected to the mounting seat 62. The second telescopic driving member 615 is used to adjust the rotation angle of the mounting seat 62 relative to the base 61, so as to meet the milling processing requirements of various angles of the inner wall of the large cylindrical rotating workpiece 7.

[0026] Preferably, the second telescopic driving member 615 is an electric telescopic cylinder.

[0027] The present invention also relates to a milling method of the above-mentioned cyclone milling machine with high machining accuracy, wherein the outer wall of a large cylindrical rotating workpiece 7 near one end is clamped on a hollow three-jaw chuck 2 for positioning; The first linear drive mechanism drives the moving seat 3 to move, and controls the middle support arm 41 and the side support arm 42 of the center frame 4 to move, so that each support roller 43 abuts against the outer wall of the large cylindrical rotating workpiece 7; Control the XYZ three-axis moving module 5 to drive the milling cutter body 610 of the milling assembly 6 to move to the position that contacts the inner wall of the large cylindrical rotating workpiece 7 and needs to be milled; Control the first linear drive mechanism to drive the moving seat 3 to move, so that the center frame 4 moves to the position where the milling cutter body 610 is located; The rotary drive mechanism is controlled to drive the hollow three-jaw chuck 2 to rotate, thereby driving the large cylindrical rotating workpiece 7 to rotate, and the second rotary drive mechanism 611 is controlled to drive the rotating cylinder 64 to rotate, driving the milling cutter body 610 to rotate, and the inner wall of the large cylindrical rotating workpiece 7 is milled; During the milling process, the XYZ three-axis moving module 5 is controlled to feed and move along the X axis, and the first linear drive mechanism is controlled to drive the moving seat 3 to feed and move synchronously along the X axis; so that the milling cutter body 610 and each supporting roller 43 are always located in the same vertical plane; The first telescopic drive member 63 is controlled to extend and move according to the wear rate of the milling cutter body 610, so that the limiting protrusion 651 slides in the spiral limiting groove 662, driving the rotary adjustment seat 66 to rotate in the opposite direction relative to the rotating cylinder 64, so that the connecting rod 67 drives the milling cutter body 610 to move outward along the limiting groove 691 to offset the wear of the milling cutter.

[0028] Preferably, the first telescopic driving member 63 is controlled to extend and move according to the wear rate of the milling cutter body 610, so that the limiting protrusion 651 slides in the spiral limiting groove 662, driving the rotary adjustment seat 66 to rotate in the opposite direction relative to the rotating cylinder 64, so that the connecting rod 67 drives the milling cutter body 610 to move outward along the limiting groove 691 to offset the wear of the milling cutter. Specifically, By establishing a machine learning model, which is specifically a deep neural network model, the material property parameters, environmental parameters and milling processing parameters of the large cylindrical rotating workpiece 7 are used as input data, and the wear rate of the milling cutter body is used as label data. The machine learning model is trained through multiple training samples; before milling, the material property parameters, environmental parameters and milling processing parameters of the large cylindrical rotating workpiece 7 are input into the trained machine learning model, and the corresponding wear rate value is output. The extension of the first telescopic drive member 63 is inferred according to the wear rate value of the milling cutter body 610. The rate value of the long movement controls the first telescopic driving member 63 to extend and move, so that the limiting protrusion 651 slides in the spiral limiting groove 662, driving the rotary adjustment seat 66 to rotate in the opposite direction relative to the rotating cylinder 64, so that the connecting rod 67 drives the milling cutter body 610 to move outward along the limiting groove 691 to offset the wear of the milling cutter; the material property parameters include the material, hardness, thermal conductivity, elongation and surface roughness of the workpiece; the milling processing parameters include the rotation speed, torque, feed amount and milling depth of the milling cutter body; the environmental parameters include ambient humidity and ambient temperature.

[0029] Preferably, the mounting seat 62 is also connected to a laser sensor, such as Keyence LJ-V7300, which monitors and obtains the surface roughness of the milling part of the workpiece in real time according to a preset time interval, and inputs it into the machine learning model to update the input data of the parameter. The mounting seat 62 is also connected to a temperature sensor and a humidity sensor, which are used to monitor and obtain the ambient temperature and humidity near the milling part of the workpiece in real time. During the milling process of the milling cutter body 610 on the large cylindrical rotating workpiece 7, the ambient temperature and humidity are obtained at a preset interval, and updated in real time to the input data, and a new wear rate value is re-output according to the updated data, thereby changing the extension rate of the first telescopic drive member 63.

[0030] Keyence LJ-V7300 is a non-contact surface roughness measurement device from KEYENCE. Its detection process is mainly based on optical measurement technology. It captures the microscopic contour of the surface through laser scanning or optical interference technology, uses sensors to record the changes in reflected light signals, converts them into height difference data, and automatically calculates the average roughness value Ra‌ through software.

[0031] The material property parameters are obtained from the parameters disclosed in the material specification or obtained by testing before processing.

[0032] In the above implementation, the workpiece material is a categorical variable and needs to be encoded, such as one-hot encoding. Hardness and thermal conductivity are both numerical and need to be normalized. Ambient temperature and humidity are also numerical and are also normalized. Tool parameters such as rotation speed, torque, feed rate, and milling depth are also numerical and are also normalized. The loss function uses MSE to obtain a data set of the mapping relationship between the corresponding tool wear speeds obtained by processing different workpieces with different tool parameters and different environmental parameters collected historically. In the acquisition of sample data, the corresponding tool wear speed can be obtained by stopping the machine after a predetermined processing time and measuring the diameter of the tool, which is obtained by the formula (S1-S2) / 2t, where S1 is the diameter of the tool milling part before processing, S2 is the diameter of the tool milling part after processing, and t is the processing time experienced by the tool milling part diameter changing from S1 to S2.

[0033] The collected dataset is randomly divided into training set, validation set and test set.

[0034] Selection of activation function, ReLU for the middle layer, MSE as loss function, Adam as optimizer, learning rate = 5e-4, weight_decay = 0.01; learning rate scheduling is configured as CosineAnnealingWarmRestarts, T_0 = 50, T_mult = 1: L2 regularization is used to prevent overfitting, and early stopping is monitored with the validation set during training. If there is no improvement in the validation set loss for 15 rounds, the training is terminated and the optimal weight is restored.

[0035] In the acquired data, new cross feature parameters can be obtained by adding cross features, that is, multiplying the speed and feed rate in the milling processing parameters; The validation method used cross validation; In the data preprocessing stage, the distribution characteristics, missing values ​​and outliers of the data are obtained, and the data is cleaned and converted.

[0036] In the above implementation mode, a machine learning model is established, and the material property parameters, environmental parameters and milling processing parameters of the large cylindrical rotating workpiece 7 are used as input data, and the wear rate of the milling cutter body 610 is used as label data to train the machine learning model; before milling, the material property parameters, environmental parameters and milling processing parameters of the large cylindrical rotating workpiece 7 are input into the trained machine learning model, and the corresponding wear rate value is output. The rate value of the extension movement of the first telescopic drive member 63 is calculated according to the wear rate value of the milling cutter body, and the extension movement of the first telescopic drive member 63 is controlled to make the limiting protrusion 651 slide in the spiral limiting groove 662, driving the rotating adjustment seat 66 to rotate in the opposite direction relative to the rotating cylinder 64, so that the connecting rod 67 drives the milling cutter body 610 to move outward along the limiting groove 691 to offset the wear of the milling cutter; thereby further improving the milling processing accuracy.

[0037] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. High machining precision whirlwind milling machine, characterized by: include: frame; A hollow three-jaw chuck, wherein the hollow three-jaw chuck is rotatably connected to the frame, and the axial direction of the hollow three-jaw chuck is the X direction; A first rotation driving mechanism, which is connected between the frame and the hollow three-jaw chuck and is used to drive the hollow three-jaw chuck to rotate; A movable seat, the movable seat is connected to the frame movably along the X direction, and the movable seat is located in the X direction of the three-jaw chuck; A first linear drive mechanism, wherein the first linear drive mechanism is used to drive the moving seat to move; A center frame, the center frame is connected to the movable seat, the center frame includes a middle support arm and side support arms symmetrically distributed on both sides of the middle support arm in the Y direction, and the middle support arm and the side support arm are both connected with support rollers for abutting against the outer circumference of the workpiece; An XYZ three-axis moving module, which is connected to the frame and is located in the X direction of the moving seat; A milling assembly, the milling assembly comprising a base, a mounting seat, a first telescopic driving member, a rotating cylinder, a rotating adjustment cylinder, a rotating adjustment seat, a connecting rod, a milling cutter connecting member, a milling cutter limiting seat, a milling cutter body and a second rotating driving mechanism; The base is connected to the XYZ three-axis moving module, and the mounting base is connected to the base; One end of the first telescopic driving member is connected to the mounting seat; The rotating cylinder is rotatably connected to the mounting seat through a first bearing, the axis of the first telescopic driving member coincides with the axis of the rotating cylinder, and the rotating adjustment cylinder is coaxially rotatably connected to the other end of the first telescopic driving member through a second bearing; the rotating adjustment cylinder is coaxially arranged in the rotating cylinder, and a limiting protrusion is arranged on the circumferential surface of the rotating adjustment cylinder; The rotation adjustment seat is provided with a cylindrical groove that is slidably matched with the rotation adjustment cylinder, the inner wall of the cylindrical groove is provided with a spiral limiting groove, the cylindrical groove is coaxially slidably sleeved on the rotation adjustment cylinder, and the limiting protrusion is located in the spiral limiting groove; The rotary adjustment seat and the rotating cylinder are rotatably connected via a third bearing; the third bearing is a one-way bearing; A plurality of milling cutter limit seats are connected to the end of the rotating cylinder in a circumferential array, and the milling cutter limit seat is provided with a limit groove for slidingly matching and connecting the milling cutter body; the milling cutter body is slidably connected to the limit groove, the inner end of the milling cutter body is connected to the milling cutter connecting piece, one end of the connecting rod is pivotally connected to the milling cutter connecting piece, and the other end is pivotally connected to the eccentric position of the end of the rotating adjustment seat, and the two ends of the connecting rod are pivotally connected axially parallel to the axial direction of the rotating adjustment seat; The second rotation drive mechanism is connected to the mounting seat, and the second rotation mechanism is transmission-connected to the rotating drum, and is used to drive the rotating drum to rotate; When the second rotating mechanism drives the rotating cylinder to rotate, the rotating cylinder drives the rotating adjustment seat to rotate synchronously.

2. The high machining precision whirlwind milling machine tool according to claim 1, characterized in that: The supporting roller is a universal roller.

3. The high machining precision whirlwind milling machine according to claim 1, characterized in that: The second rotation drive mechanism includes a drive motor, a first gear and a second gear. The drive motor is connected to the mounting seat. The first gear is drivingly connected to the output shaft of the drive motor. The second gear is coaxially sleeved on the outer wall of the rotating cylinder. The first gear is meshed with the second gear.

4. The high machining precision whirlwind milling machine tool according to claim 1, characterized in that: The limiting groove of the milling cutter limiting seat is in the shape of a rectangular parallelepiped, and the side of the milling cutter body is slidably matched with the limiting groove.

5. The high machining precision whirlwind milling machine tool according to claim 1, characterized in that: The first telescopic driving component is an electric telescopic cylinder.

6. The high machining precision whirlwind milling machine tool according to claim 1, characterized in that: The mounting seat is pivotally connected to the base, and also includes a second telescopic driving member, one end of the second telescopic driving member is pivotally connected to the base, and the other end is pivotally connected to the mounting seat.

7. The high machining precision whirlwind milling machine tool according to claim 6, characterized in that: The second telescopic driving member is an electric telescopic cylinder.

8. The milling method of a whirlwind milling machine with high machining accuracy according to any one of claims 1 to 7, characterized in that: The following steps are involved: The outer wall of a large cylindrical rotating workpiece near one end is clamped on a hollow three-jaw chuck for positioning; The first linear drive mechanism drives the moving seat to move, and controls the middle support arm and the side support arm of the center frame to move, so that each support roller abuts against the outer wall of the large cylindrical rotating workpiece; Control the XYZ three-axis moving module to drive the milling cutter body of the milling assembly to move to the position that contacts the inner wall of the large cylindrical rotating workpiece and needs to be milled; Control the first linear drive mechanism to drive the moving seat to move, so that the center frame moves to the position where the milling cutter body is located; The rotary drive mechanism is controlled to drive the hollow three-jaw chuck to rotate, thereby driving the large cylindrical rotating workpiece to rotate, and the second rotary drive mechanism is controlled to drive the rotating cylinder to rotate, driving the milling cutter body to rotate, and milling the inner wall of the large cylindrical rotating workpiece; During the milling process, the XYZ three-axis moving module is controlled to feed and move along the X axis, and at the same time, the first linear drive mechanism is controlled to drive the moving seat to feed and move synchronously along the X axis; so that the milling cutter body and each supporting roller are always located in the same vertical plane; The first telescopic drive member is controlled to extend and move according to the wear rate of the milling cutter body, so that the limiting protrusion slides in the spiral limiting groove, driving the rotary adjustment seat to rotate in the opposite direction relative to the rotating cylinder, so that the connecting rod drives the milling cutter body to move outward along the limiting groove to offset the wear of the milling cutter.

9. The milling method of a whirlwind milling machine with high machining accuracy according to claim 8, characterized in that: The method of controlling the first telescopic driving member to extend and move according to the wear rate of the milling cutter body so that the limiting protrusion slides in the spiral limiting groove, drives the rotary adjustment seat to rotate in the opposite direction relative to the rotating cylinder, and causes the connecting rod to drive the milling cutter body to move outward along the limiting groove to offset the wear of the milling cutter is specifically as follows: By establishing a machine learning model, the material property parameters, environmental parameters and milling processing parameters of a large cylindrical rotating workpiece are used as input data, and the wear rate of the milling cutter body is used as label data. The machine learning model is trained through multiple training samples. Before milling, the material property parameters, environmental parameters and milling processing parameters of the large cylindrical rotating workpiece are input into the trained machine learning model, and the corresponding wear rate value is output. The rate value of the extension movement of the first telescopic drive member is calculated according to the wear rate value of the milling cutter body, and the extension movement of the first telescopic drive member is controlled to make the limiting protrusion slide in the spiral limiting groove, drive the rotating adjustment seat to rotate in the opposite direction relative to the rotating cylinder, and make the connecting rod drive the milling cutter body to move outward along the limiting groove to offset the wear of the milling cutter. The material property parameters include the material, hardness, thermal conductivity, elongation and surface roughness of the workpiece; the milling processing parameters include the rotation speed, torque, feed amount and milling depth of the milling cutter body; the environmental parameters include ambient humidity and ambient temperature.

10. The milling method of a whirlwind milling machine with high machining accuracy according to claim 9, characterized in that: The machine learning model is specifically a deep neural network model.

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