Automatic aligning method for workbench

Abstract

The invention relates to the technical field of turning and milling combined machining, and provides an automatic aligning method for a workbench, which comprises the following steps of: fixing an annular workpiece on a workpiece mounting plate of an aligning workbench; the workpiece mounting plate is locked through the hydraulic assembly; the center position coordinate of the annular workpiece is detected through a measuring head and recorded as M; after the front face of the annular workpiece is machined, the hydraulic assembly is loosened, and the annular workpiece is fixed to the workpiece mounting plate again after being turned over; measuring the center position coordinate of the annular workpiece again through the measuring head and recording the center position coordinate as N, and calculating the position coordinate deviation of M and N through the numerical control system; according to the coordinate deviation, the center position coordinate of the annular workpiece is adjusted to the M position from N through an aligning assembly; and the workpiece mounting plate is locked again through the hydraulic assembly. Automatic adjustment of the coaxiality after the workpiece is turned over is achieved, the adjustment time is effectively shortened, the adjustment precision is improved, and then the machining efficiency and the machining yield of the machine tool are improved.

Description

Technical Field

[0001] This invention relates to the field of milling and turning machining technology, and more particularly to an automatic table centering method. Background Technology

[0002] Milling and turning technology, with its integrated and efficient processing advantages, is widely used in the manufacturing of complex and precision parts. During the turning process, both sides of the workpiece are typically machined. The coaxiality of the workpiece after flipping is a key factor affecting the machining accuracy. If there is a coaxiality deviation after flipping, it will lead to uneven stress on the workpiece during machining, deviation of the cutting trajectory, and consequently, problems such as out-of-tolerance dimensional accuracy and unacceptable surface roughness. In severe cases, it may even cause the workpiece to be scrapped. Therefore, ensuring high-precision coaxiality after workpiece flipping is a core prerequisite for improving the quality of turning machining.

[0003] Currently, the industry generally uses a traditional manual adjustment method to adjust the coaxiality of workpieces after flipping. However, this traditional manual adjustment method suffers from problems such as low adjustment efficiency and low adjustment accuracy. Summary of the Invention

[0004] This invention provides an automatic table alignment method to address the shortcomings of existing turning processes where the coaxiality of the workpiece during front and back machining relies heavily on operator experience, resulting in low adjustment efficiency and accuracy. This method achieves automatic adjustment after workpiece flipping, effectively shortening adjustment time, improving adjustment accuracy, and consequently enhancing machine tool processing efficiency and yield.

[0005] This invention provides a method for automatic table alignment, comprising the following steps: S1: Fix the ring-shaped workpiece onto the workpiece mounting plate of the self-aligning worktable; S2: The workpiece mounting plate is locked using a hydraulic assembly; S3: Detect the center position coordinates of the ring-shaped workpiece using the probe and record them as M, then begin machining the front side of the ring-shaped workpiece; S4: After the front side of the ring-shaped workpiece is machined, the hydraulic components are released, the ring-shaped workpiece is flipped over and then re-fixed on the workpiece mounting plate. S5: Measure the center position coordinates of the ring-shaped workpiece again with the probe and record them as N, and calculate the position coordinate deviations (△X, △Y) between M and N through the CNC system. S6: Based on the coordinate deviation (△X, △Y), adjust the center position coordinates of the annular workpiece from N to M using the self-aligning component; S7: The workpiece mounting plate is locked again by the hydraulic assembly, and the back side of the ring-shaped workpiece is processed.

[0006] According to the present invention, an automatic table centering method includes the following steps for the centering adjustment process of the centering component in step S6: S61: The machine tool spindle picks up the angle head and moves it to the first direction adjustment screw; S62: Insert the Allen wrench at the front end of the angle head into the first direction adjusting screw; S63: Based on the coordinate deviation △Y, the angle head rotates, which drives the first direction adjustment screw to rotate, and then drives the first direction lower slider and the first direction upper slider to move. The first direction upper slider and the first direction lower slider press against the X direction slider to complete the Y direction adjustment of the annular workpiece. S64: The machine tool drives the angle head to retract from the first direction adjusting screw and approach the second direction adjusting screw, and the internal hex wrench at the front end of the angle head is inserted into the second direction adjusting screw; S65: Based on the coordinate deviation △X, the angle head rotates, which drives the second direction adjustment screw to rotate, and then drives the second direction lower slider and the second direction upper slider to move. The second direction upper slider and the second direction lower slider press against the Y direction slider to complete the X direction adjustment of the annular workpiece. S66: The workpiece center position is adjusted by the machine tool driving the angle head to disengage from the second direction adjustment screw.

[0007] According to the present invention, an automatic table alignment method is provided, wherein the alignment component includes an X-axis slider and a Y-axis slider, the X-axis slider and the Y-axis slider are located in the same plane and are both fixedly connected to the workpiece mounting plate, and the X-axis slider and the Y-axis slider are used to drive the workpiece mounting plate to slide together along the Y direction or the X direction, respectively.

[0008] According to the present invention, an automatic self-aligning method for a workbench is provided, wherein the self-aligning assembly further includes a self-aligning support base, a first upward slider, a first downward slider, a second upward slider, and a second downward slider. The self-aligning support base has a hollow cross-shaped groove in the middle. The cross-shaped groove includes a first direction slide and a second direction slide that intersect each other. The first upward slider and the first downward slider are respectively placed on the first direction slide and connected by a first connecting rod. The second upward slider and the second downward slider are respectively placed on the second direction slide and connected by a second connecting rod. The two connecting rods are distributed vertically within the cross-shaped groove.

[0009] According to the present invention, an automatic table alignment method is provided, wherein both the first upward slider and the first downward slider are provided with X-direction grooves, the X-direction slider is disposed in the X-direction grooves and can slide along the X direction; Both the upper slider and the lower slider in the second direction are provided with Y-direction grooves. The Y-direction slider is disposed in the Y-direction groove and can slide along the Y direction. The first direction is set at an angle to the X direction, the second direction is set at an angle to the Y direction, and the first direction and the second direction are perpendicular to each other.

[0010] According to the present invention, an automatic table alignment method is provided, wherein the X-axis slide grooves on the first upward slider and the first downward slider are arranged parallel to each other, and each X-axis slide groove is provided with an X-axis slider. The Y-axis grooves on the second upward slider and the second downward slider are arranged parallel to each other, and each Y-axis groove contains a Y-axis slider.

[0011] According to the present invention, an automatic self-aligning method for a workbench is provided, wherein the self-aligning assembly further includes a first direction lead screw, a first direction nut, a second direction lead screw, and a second direction nut fixed on the self-aligning support base. The first direction lead screw cooperates with the first direction nut and is connected to the first direction lower slider. The first direction lower slider can be driven to slide along the first direction by rotating the first direction lead screw. The second direction lead screw is engaged with the second direction nut and connected to the second direction lower slider. By rotating the second direction lead screw, the second direction lower slider can be driven to slide along the second direction.

[0012] According to the present invention, a planar needle roller bearing is provided between the slider in the first direction and the self-aligning support, between the slider in the first direction and the self-aligning support, between the slider in the second direction and the self-aligning support, between the slider in the second direction and the self-aligning support, between the slider in the second direction and the self-aligning support, between the slider in the X direction and the X direction slide groove, and between the slider in the Y direction and the Y direction slide groove.

[0013] According to the present invention, an automatic self-aligning method for a workbench is provided, wherein the self-aligning workbench includes a workpiece mounting plate, a self-aligning assembly, and a hydraulic assembly, wherein the self-aligning assembly is connected between the workpiece mounting plate and the hydraulic assembly, and the workpiece mounting plate is used to mount a ring-shaped workpiece. The hydraulic assembly includes a base, a piston, a pressure block, a piston end cap, and a pressure adjusting screw. A hydraulic pipeline is installed inside the base, filled with hydraulic oil and connected to the piston. The pressure adjusting screw extends into the hydraulic pipeline. The locking process of the hydraulic assembly in step S2 includes the following steps: S21: Grasp the angle head via the machine tool spindle; S22: The machine tool drives the angle head to approach the pressure regulating screw; S23: Insert the Allen wrench at the front of the angle head into the pressure adjusting screw; S24: The rotation of the machine tool spindle drives the angle head to rotate, which in turn drives the pressure regulating screw to rotate and compress the hydraulic oil; S25: When the hydraulic oil reaches the preset pressure, the machine tool spindle stops rotating, and the machine tool drives the angle head to retract the pressure adjusting screw to complete the hydraulic locking.

[0014] According to the present invention, in step S1, the self-aligning worktable is fixed on a rotary worktable, and the rotary worktable is fixed on a CNC machine tool.

[0015] According to the automatic table alignment method provided by the present invention, in step S3, the probe is fixed on the machine tool spindle, the machine tool spindle drives the probe to complete the detection of the center position coordinates of the annular workpiece, and stores the detected center position coordinates in the CNC system.

[0016] According to the automatic self-aligning method of the workbench provided by the present invention, the loosening of the hydraulic component in step S4 is the reverse process of the locking of the hydraulic component in step S2, which is completed by the angle head driving the pressure adjusting screw to rotate in the opposite direction.

[0017] This invention provides an automatic worktable centering method. A probe detects the center coordinates (M and N) of the front and back sides of a ring-shaped workpiece, and a CNC system calculates the deviation between these coordinates. Based on this deviation, a centering assembly adjusts the center coordinates of the ring-shaped workpiece from N to M. All of these operations are performed by automated equipment, eliminating the need for complex manual measurements and adjustments, thus achieving automatic coaxiality adjustment during the machining of both sides of the workpiece. Furthermore, the probe can quickly and accurately detect the center coordinates of the ring-shaped workpiece, and the CNC system can quickly calculate the coordinate deviation. Compared to manually observing pointer movement and estimating deviations using a dial indicator, this efficient detection and calculation method significantly reduces the time spent detecting and judging deviations, thereby shortening the overall coaxiality adjustment time. The automated centering method can quickly and accurately complete coaxiality adjustment, avoiding machining interruptions or repeated adjustments caused by inaccurate or time-consuming manual adjustments, ensuring the continuity and stability of machine tool processing, and further improving machining efficiency. Meanwhile, high-precision coaxiality adjustment ensures uniform force on the workpiece during processing and accurate cutting trajectory, which can effectively reduce the occurrence of problems such as out-of-tolerance dimensional accuracy and non-compliance with surface roughness requirements, improve the processing quality of parts, and thus increase the yield rate of machine tool processing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is one of the flowcharts illustrating the automatic table alignment method provided by the present invention.

[0020] Figure 2 This is the second flowchart illustrating the automatic table alignment method provided by the present invention.

[0021] Figure 3 This is the third flowchart of the automatic table alignment method provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the overall structure of an embodiment of the automatic table alignment system provided in this invention.

[0023] Figure 5 This is a schematic diagram of the overall structure of another embodiment of the automatic table alignment system provided in this invention.

[0024] Figure 6 This is a schematic diagram of the overall structure of the self-aligning workbench provided in an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the hydraulic component provided in an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of the back structure of the hydraulic component provided in an embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the self-aligning component provided in an embodiment of the present invention.

[0028] Figure 10 This is a schematic diagram of the structure of the first direction downward slider provided in an embodiment of the present invention.

[0029] Figure 11 This is a coordinate schematic diagram of the self-aligning worktable provided in an embodiment of the present invention.

[0030] Figure label: 1. Machine tool; 2. Rotary table; 3. Workpiece; 4. Spindle; 5. Probe; 6. Angle head; 7. Self-aligning table; 71. Workpiece mounting plate; 72. Self-aligning assembly; 720. Self-aligning support; 721. X-axis slider; 722. First-direction slider; 723. Connecting rod; 724. Y-axis slider; 725. Second-direction slider; 726. First-direction lower slider; 727. First-direction lead screw; 728. First-direction nut; 729. Second-direction lower slider; 7210. Second-direction lead screw; 7211. Second-direction nut; 7212. First needle roller bearing; 7213. Second needle roller bearing; 73. Hydraulic assembly; 731. Pressure block; 732. Base; 733. Pressure adjusting screw; 734. Pressure adjusting nut; 735. Pressure adjusting nut mounting base; 736. Piston end cap; 737. Screw; 738. Piston. Detailed Implementation

[0031] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0034] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] The following is combined with Figures 1 to 11 The present invention will provide a detailed description of an automatic workbench alignment method through specific embodiments and application scenarios.

[0037] Figure 1 This is one of the flowcharts illustrating an automatic table alignment method provided by the present invention, such as... Figure 1 As shown, an automatic table alignment method includes the following steps: Step 1: Fix the annular workpiece 3 onto the workpiece mounting plate 71 of the self-aligning worktable 7.

[0038] The workpiece mounting plate 71 is the direct load-bearing component of the annular workpiece 3, and its core function is to provide a flat and stable mounting reference for the workpiece 3. This step, by initially fixing the annular workpiece 3 onto the workpiece mounting plate 71, ensures that the workpiece 3 will not shift arbitrarily during subsequent locking, inspection, processing, and flipping processes, laying the foundation for subsequent high-precision inspection and self-alignment. At the same time, the workpiece mounting plate 71 is directly linked to the self-aligning assembly 72, and subsequent position adjustments of the self-aligning assembly 72 can be synchronously transmitted to the workpiece 3 through the mounting plate, achieving precise displacement of the center of the workpiece 3.

[0039] Step 2: Lock the workpiece mounting plate 71 using the hydraulic assembly 73.

[0040] This step utilizes the powerful locking force generated by the hydraulic components to ensure a tight connection between the workpiece mounting plate and the self-aligning worktable. This prevents the workpiece from moving or loosening during processing due to factors such as cutting forces and vibrations, thereby ensuring the stability and accuracy of the processing.

[0041] Step 3: Detect the center position coordinates of the ring workpiece 3 using probe 5 and record them as M, then begin machining the front side of the ring workpiece 3.

[0042] The probe 5, as a detection component, accurately captures the center position of the front side of the annular workpiece 3 and forms a digital coordinate M. Compared to the indirect readings from a traditional manual dial indicator, the probe 5 can directly convert the center position of the workpiece 3 into coordinate data recognizable by the CNC system through contact detection, and this data has extremely high accuracy. The recorded coordinate M will serve as the reference for subsequent flipping processing. All subsequent self-aligning actions are aimed at M, ensuring that the processing of both sides of the workpiece 3 is based on the same central reference.

[0043] Step 4: After the front side is processed, the hydraulic component 73 is released, and the workpiece 3 is flipped over and then fixed again.

[0044] This step involves loosening the hydraulic assembly that secures the workpiece mounting plate. Once the workpiece is reattached to the mounting plate, it prepares the workpiece for subsequent inspection of the reverse side center position coordinates and reverse side machining. It also provides the necessary conditions for a comprehensive assessment of the workpiece's coaxiality.

[0045] Step 5: Measure the center position N using probe 5, and the CNC system calculates the coordinate deviation between M and N.

[0046] The probe 5 repeats the detection logic of step 3 to accurately obtain the center position coordinate N of the workpiece 3 after it is flipped. By comparing it with the front coordinate M, it can intuitively reflect the offset of the center of the workpiece 3 after it is flipped. The CNC system undertakes the data processing function. It automatically calculates the deviation values ​​(△X, △Y) between M and N in the X and Y axis directions through the built-in algorithm. It transforms the abstract position difference into specific and quantifiable self-aligning parameters, and provides clear adjustment instructions for the action of the self-aligning component 72, avoiding the subjectivity and error of manual judgment of deviation.

[0047] Step 6: Based on the coordinate deviation, adjust the center of workpiece 3 from N to M using the self-aligning component 72.

[0048] The self-aligning assembly 72 is the actuator for automatic self-alignment. Its function is to drive the workpiece mounting plate to precisely displace the workpiece 3 based on the deviation parameters (△X, △Y) output by the CNC system. Through a cross-shaped groove, a bidirectional slider, and a lead screw and nut transmission structure, the self-aligning assembly 72 can achieve independent adjustment in the X and Y axes respectively. By controlling the slider's movement distance, it precisely compensates for deviations, accurately adjusting the center of the workpiece 3 from the offset position N to the reference position M. This solves the problem of the coarseness of traditional manual tapping adjustments, achieving digital correction of deviations and ensuring adjustment accuracy.

[0049] Step 7: Lock the workpiece mounting plate again using the hydraulic assembly 73, and begin machining the back side of the annular workpiece 3.

[0050] After the self-alignment adjustment is completed, the hydraulic components are used again to lock the workpiece mounting plate, which can firmly fix the adjusted ring workpiece on the self-aligning worktable, preventing the workpiece from moving again during subsequent processing and ensuring the stability and accuracy of processing.

[0051] This application uses a probe 5 to detect the center position coordinates (M and N) of the front and back sides of the ring-shaped workpiece 3, and uses a CNC system to calculate the deviation between the two position coordinates. Then, based on this deviation, the center position coordinates of the ring-shaped workpiece 3 are adjusted from position N to position M using the self-aligning assembly 72. All of the above operations are completed by automated equipment, eliminating the need for complex manual measurement and adjustment, thus achieving automatic coaxiality adjustment during the machining of the front and back sides of the workpiece. Secondly, the probe 5 can quickly and accurately detect the center position coordinates of the ring-shaped workpiece 3, and the CNC system can quickly calculate the coordinate deviation. Compared to manually observing the pointer swing and estimating the deviation using a dial indicator, this efficient detection and calculation method significantly reduces the time spent detecting and judging the deviation, thereby shortening the overall coaxiality adjustment time. The automated self-aligning method can quickly and accurately complete the coaxiality adjustment, avoiding machining interruptions or repeated adjustments caused by inaccurate or time-consuming manual adjustments, ensuring the continuity and stability of the machine tool 1's machining, and further improving machining efficiency. Meanwhile, the high-precision coaxiality adjustment ensures that the workpiece 3 is subjected to uniform force during processing and the cutting trajectory is accurate. This can effectively reduce the occurrence of problems such as out-of-tolerance dimensional accuracy of parts and non-compliance with surface roughness requirements, improve the processing quality of parts, and thus increase the yield rate of machine tool 1.

[0052] Reference Figure 2 According to the automatic table centering method provided by the present invention, the centering adjustment process of the centering component 72 in step S6 includes the following steps: S61: The machine tool spindle 4 picks up the angle head 6 and moves it to the first direction adjustment screw; S62: Insert the Allen wrench at the front end of angle head 6 into the first direction adjusting screw; S63: Based on the coordinate deviation △Y, the angle head 6 is rotated, which drives the first direction adjustment screw to rotate, and then drives the first direction lower slider 726 and the first direction upper slider 722 to move. The first direction upper slider 722 and the first direction lower slider 726 press the X direction slider to complete the adjustment of the ring workpiece in the 3Y direction. S64: Machine tool 1 drives angle head 6 to retract from the first direction adjusting screw and approach the second direction adjusting screw, and the internal hex wrench at the front end of angle head 6 is inserted into the second direction adjusting screw; S65: Based on the coordinate deviation △X, the angle head 6 is rotated, which drives the second direction adjustment screw to rotate, and then drives the second direction lower slider 729 and the second direction upper slider 725 to move. The second direction upper slider 725 and the second direction lower slider 729 press the Y direction slider to complete the adjustment of the ring workpiece in the 3X direction. S66: The angle head 6 is driven out of the second direction adjustment screw by the machine tool 1 to complete the center position adjustment of the workpiece 3.

[0053] It is understandable that step S61 involves the machine tool spindle 4 gripping the angle head 6 and moving it to the first direction adjustment screw.

[0054] As the core moving component of machine tool 1, the spindle 4 grips the angle head 6 to connect it to the self-aligning assembly 72 as an intermediate execution tool. The angle head 6 can convert the rotational power of the spindle 4 into the driving power of the adjusting screw. The spindle 4 drives the angle head 6 to the adjusting screw in the first direction. This precise positioning is achieved through the CNC positioning system of machine tool 1, ensuring that the angle head 6 can be accurately aligned with the screw. This provides spatial positioning assurance for subsequent insertion actions and avoids mechanical interference or connection failure caused by positioning deviation.

[0055] Step S62: Insert the internal hex wrench at the front end of the angle head 6 into the first direction adjusting screw.

[0056] The Allen wrench at the front end of the angle head 6 is a rigid connection structure specifically adapted to the adjusting screw. Its function is to establish a mechanical engagement between the angle head 6 and the first-direction adjusting screw. Through the insertion action, the Allen wrench and the internal hexagonal hole of the screw form a tight fit, ensuring that the torque when the angle head 6 rotates can be completely transmitted to the screw, avoiding problems such as slippage and free rotation, and providing a reliable power transmission link for the stable rotation of the screw.

[0057] Step S63: Based on the △Y deviation, the angle head 6 drives the lead screw to rotate, which in turn drives the slider to move and press the X-direction slider 721, thus completing the Y-direction adjustment.

[0058] This step is the execution stage of Y-direction centering, with each action revolving around the precise correction of △Y deviation. The angle head 6 rotates according to the preset angle based on the △Y deviation command issued by the CNC system. This rotation is transmitted to the first-direction adjusting screw via an Allen wrench. The screw, through its screw engagement with the nut, converts the rotational motion into linear movement of the lower slider 726 and the upper slider in the first direction. Due to the angled design of the contact structure between the slider and the X-direction slider 721, the movement of the slider generates a directional compressive force on the X-direction slider 721, pushing it to move the workpiece mounting plate 71 along the Y-axis. The distance traveled precisely compensates for the △Y deviation, ultimately completing the precise adjustment of the workpiece 3's center in the Y-direction.

[0059] Step S64: The machine tool 1 drives the angle head 6 to exit the first direction lead screw 727, and approaches and inserts the second direction lead screw 7210.

[0060] Machine tool 1 drives angle head 6 to disengage from the first direction lead screw 727 to release the connection with the lead screw and avoid obstructing subsequent movements. Then, it drives angle head 6 to approach the second direction adjustment lead screw and completes the insertion. Through the precise control of the CNC positioning system, the positioning and connection logic of steps S61-S62 is repeated to ensure that angle head 6 can accurately align with the second direction lead screw 7210, preparing for the power transmission of Y-direction adjustment and ensuring the continuity and smoothness of the entire self-aligning process.

[0061] Step S65: Based on the △X deviation, the angle head 6 drives the lead screw to rotate, which in turn drives the slider to move and press the Y-axis slider 724, thus completing the X-direction adjustment.

[0062] This step, consistent with the adjustment logic of S63, is a specific correction step for the X-direction deviation △X. The angle head 6 rotates according to the △X deviation command, driving the second-direction adjusting screw to rotate, which in turn drives the lower slider 729 and upper slider to move linearly. Through the angle compression structure between the slider and the Y-direction slider 724, the linear motion is converted into the directional movement of the Y-direction slider 724, causing the workpiece mounting plate 71 to move along the X-axis. The moving distance precisely compensates for the △X deviation, ultimately completing the adjustment of the workpiece 3's center in the X-direction. This step, in conjunction with S63, achieves complete deviation correction of the workpiece 3's center in a two-dimensional plane.

[0063] Step S66: Machine tool 1 drives angle head 6 to disengage from the second direction lead screw 7210, completing the self-alignment.

[0064] Machine tool 1 drives the angle head 6 to exit the second direction lead screw 7210, which can prevent the angle head 6 from interfering with other parts of machine tool 1 or workpiece 3 during the subsequent workpiece 3 processing; at the same time, the angle head 6 can be taken back to the designated tool magazine by the spindle 4 to complete the tool return and prepare for machine tool 1 to enter the flipping processing stage, ensuring a smooth connection between the self-aligning process and the processing process.

[0065] An automatic table alignment method is applied to an automatic table alignment system. (Refer to...) Figure 4 and Figure 5 An automatic self-aligning system for a worktable includes a machine tool 1, a rotary worktable 2, a workpiece 3, a spindle 4, a probe 5, an angle head 6, and a self-aligning worktable 7.

[0066] Workpiece 3 is fixed on self-aligning worktable 7, which is fixed on rotary worktable 2, which is fixed on machine tool 1. Rotary worktable 2 drives self-aligning worktable 7 to rotate, which in turn drives workpiece 3 to rotate.

[0067] The spindle 4 is mounted on the machine tool 1, and the probe 5 is mounted on the spindle 4 to complete the center measurement of the workpiece 3. The measurement data is stored in the CNC system. The angle head 6 can replace the probe 5 and is mounted on the spindle 4. The angle head 6 assists the self-aligning worktable 7 to complete the hydraulic locking and center adjustment functions of the worktable.

[0068] Combination Figures 6 to 11 As shown, the self-aligning worktable 7 consists of a workpiece mounting plate 71, a self-aligning assembly 72, and a hydraulic assembly 73. The workpiece mounting plate 71 is used to mount the workpiece. The hydraulic locking and unlocking in steps S2, S4, and S6 are completed by the hydraulic assembly 73. The hydraulic assembly includes a base 732, hydraulic lines (not shown in the figure), a pressure adjusting screw 733, a pressure adjusting nut 734, a pressure adjusting nut mounting seat 735, a piston 738, a piston end cap 736, and a pressure block 731. The hydraulic lines are located inside the base 732. The pressure adjusting nut 734 is mounted on the pressure adjusting nut mounting seat 735, and the pressure adjusting nut mounting seat 735 is fixed to the base 732. The pressure adjusting screw 733 is screwed to the pressure adjusting nut 734. One end of the pressure adjusting screw 733 is equipped with a sealing ring and extends into the base 732 to connect with the hydraulic lines. Rotating the pressure adjusting screw 733 can adjust the pressure of the hydraulic lines. The front adjustment tool of the angle head 6 extends into the front end of the pressure regulating screw 733. Clockwise rotation controls the pressure regulating screw 733 to extend into the pipeline, increasing the hydraulic pressure. Once the preset pressure is reached, rotation stops. Correspondingly, counterclockwise rotation controls the pressure regulating screw to exit the pipeline, decreasing the hydraulic pressure. Once the preset pressure is reached, rotation stops.

[0069] The hydraulic assembly 73, the self-aligning assembly 72, and the workpiece mounting plate 71 are provided with axial holes that extend vertically. The bottom of the axial holes is sealed by piston end caps 736, and a pressure block 731 is provided at the top. A piston 738 is disposed in the axial holes, which are connected to hydraulic lines. Changes in the hydraulic line pressure can cause the piston 738 to move along the axial holes. The pressure block 731 and the piston 738 are fixedly connected by screws 737. The movement of the piston 738 can cause the pressure block 731 to lock and release the workpiece mounting plate 73.

[0070] The center measurement process in steps 3 and 5 is completed by probe 5. After the workpiece mounting plate 73 is locked, the spindle 4 will drive probe 5 to complete the measurement of the center position of workpiece 3. The measurement data is recorded in the CNC system as position M. After that, the machine tool 1 processes the front side of workpiece 3. After processing, the hydraulic assembly 72 releases the workpiece mounting plate 71, removes workpiece 3, flips workpiece 3 and refixes it on the workpiece mounting plate 71. The spindle 4 drives probe 5 to measure the center position N of workpiece 3 after flipping. The CNC system calculates the position coordinate deviations (△X, △Y) of M and N. Based on the coordinate deviations, the center position of workpiece 3 is adjusted from N to the original position M. The process of adjusting the center position of workpiece 3 from N to the original position M in step 6 is completed by the self-aligning assembly.

[0071] The self-aligning assembly 72 includes a self-aligning support 720, a first upward slider 722, a first downward slider 726, a second upward slider 725, a second downward slider 729, a connecting rod 723, an X-axis slider 721, a Y-axis slider 724, a first-direction lead screw 727, a first-direction nut 728, a second-direction lead screw 7210, a second-direction nut 7211, a first needle roller bearing 7212, and a second needle roller bearing 7213.

[0072] Combination Figure 9 The self-aligning support 720 has a hollow cross-shaped slide groove inside. A first-direction slider 722 and a first-direction downward slider 726 are respectively disposed within the first-direction slide of the cross-shaped slide groove, and can slide along the first direction within the first-direction slide. A second-direction slider 725 and a second-direction downward slider 729 are respectively disposed within the second-direction slide of the cross-shaped slide groove, and can slide along the second direction within the second-direction slide. The first-direction slider 722 and the first-direction downward slider 726 are connected by a connecting rod 723, and the second-direction slider 725 and the second-direction downward slider 729 are connected by a connecting rod 723. The two connecting rods 723 are vertically distributed at the center of the cross-shaped slide groove.

[0073] The first upward slider 722 and the first downward slider 726 are each provided with an X-direction groove parallel to the X direction. An X-direction slider 721 is installed within each X-direction groove, and the X-direction slider 721 can slide along the X direction within the X-direction groove. The second upward slider 725 and the second downward slider 729 are each provided with a Y-direction groove parallel to the Y direction. A Y-direction slider 724 is installed within each Y-direction groove, and the Y-direction slider 724 can slide along the Y direction within the Y-direction groove. For example... Figure 9 As shown, the first direction S forms a certain angle with the X direction, and the second direction T forms a certain angle with the Y direction. The first direction S is perpendicular to the second direction T. Both the X-axis slider 721 and the Y-axis slider 729 are fixedly connected to the workpiece mounting plate 71, which can drive the workpiece mounting plate 71 to move in the Y and X directions.

[0074] Combination Figure 9 As shown, the sliding of the first upward slider 722 and the first downward slider 726 along the first direction is driven by the first direction lead screw 727. The first direction lead screw 727 is connected to the first downward slider 726 and is screwed onto the first direction nut 728. The first direction nut 728 is installed on the self-aligning support 720. The spindle 4 drives the angle head 6 to insert into the first direction lead screw 727 and rotates the first direction lead screw 727. Through the screw engagement of the first direction lead screw 727 and the first direction nut 728, the first direction lead screw 727 can move linearly along the first direction, and sequentially drive the first direction lower slider 726 and the first direction upper slider 722 to slide along the first direction. This causes the first direction upper slider 722 and the first direction lower slider 726 to generate relative motion with the X-direction slider 721 in the X direction. Since the first direction and the X direction are at a certain angle, that is, the relative motion direction is at a certain angle with the sliding direction of the first direction upper slider 722 and the first direction lower slider 726, the relative motion of the first direction upper slider 722 and the first direction lower slider 726 with the X-direction slider 721 can cause the X-direction slider 721 to move in the Y direction, thereby driving the workpiece mounting plate 71 to move in the Y direction, thus realizing the adjustment of the workpiece 3 in the Y direction.

[0075] Similarly, the sliding of the second upward slider 725 and the second downward slider 729 along the second direction is driven by the second direction lead screw 7210. The second direction lead screw 7210 is connected to the second downward slider 729 and is screwed onto the second direction nut 7211. The second direction nut 7211 is installed on the self-aligning support 720. The main spindle 4 drives the angle head 6 to insert into the second direction lead screw 7210, and drives the second direction lead screw 7210 to rotate. Through the screw engagement of the second direction lead screw 7210 and the second direction nut 7211, the second direction lead screw 7210 can move linearly along the second direction, and sequentially drive the second direction lower slider 729 and the second direction upper slider 725 to slide along the second direction. This causes the second direction lower slider 729 and the second direction upper slider 725 to generate relative motion with the Y-direction slider 724 in the Y direction. Since the second direction is at a certain angle to the Y direction, that is, the relative motion direction is at a certain angle to the sliding direction of the second direction upper slider 725 and the second direction lower slider 729, the relative motion of the second direction upper slider 725 and the second direction lower slider 729 with the Y-direction slider 724 can cause the Y-direction slider 724 to move in the X direction, thereby driving the workpiece mounting plate 71 to move in the X direction, thus realizing the adjustment of the workpiece in the X direction.

[0076] The centering of the workpiece in step S6 can be achieved by adjusting the X and Y directions as described above. To ensure the movement accuracy of the X-axis slider 721 and the Y-axis slider 724 during the adjustment process, flat needle roller bearings 7212 are provided between the slider 722 in the first direction and the self-aligning support 720, between the lower slider 726 in the first direction and the self-aligning support 720, between the slider 725 in the second direction and the self-aligning support 720, and between the lower slider 729 in the second direction and the self-aligning support 720. Flat needle roller bearings 7213 are provided between the X-axis slider 721 and the upper slider 722 in the first direction, between the X-axis slider 721 and the lower slider 726 in the first direction, between the Y-axis slider 724 and the upper slider 725 in the second direction, and between the Y-axis slider 724 and the lower slider 729 in the second direction.

[0077] Reference Figure 3 According to the automatic self-aligning method for a workbench provided by the present invention, the locking process of the hydraulic component 73 in step S2 includes the following steps: Step S21: Grab the angle head 6 using the machine tool spindle 4.

[0078] The angle head 6, acting as an intermediate tool connecting the spindle 4 and the pressure regulating screw 733 of the hydraulic assembly 73, cannot be directly linked to the power system of the spindle 4. The spindle 4 extends its rotational power transmission channel to the pressure regulating screw 733 by gripping the angle head 6, providing the power foundation for subsequently driving the rotation of the pressure regulating screw 733. Simultaneously, the gripping action of the spindle 4 is precisely controlled by a CNC system to ensure the angle head 6 is securely installed, preventing it from falling off or slipping during subsequent rotation, thus ensuring the safety and stability of the locking process.

[0079] Step S22: The angle head 6 is driven by the machine tool 1 to approach the pressure adjusting screw 733.

[0080] Machine tool 1 uses a built-in coordinate positioning algorithm to drive spindle 4, which in turn moves angle head 6 along a preset trajectory, ensuring precise alignment between the hexagonal wrench at the front end of angle head 6 and the hexagonal socket of pressure adjusting screw 733. This high-precision positioning avoids alignment deviations that may occur during manual operation, prevents mechanical collisions caused by misalignment between angle head 6 and pressure adjusting screw 733, and provides space for smooth completion of subsequent insertion actions, thus improving the efficiency of the locking process.

[0081] Step S23: Insert the internal hex wrench at the front end of the angle head 6 into the pressure adjusting screw 733.

[0082] The hex wrench at the front end of the angle head 6 and the hex structure of the adjusting screw 733 are specially designed to form a rigid, gapless power transmission link. After the hex wrench is inserted into the adjusting screw 733, the two form a tight engagement, ensuring that when the spindle 4 drives the angle head 6 to rotate, the torque can be completely and without loss transmitted to the adjusting screw 733, avoiding power loss problems such as slippage and free rotation.

[0083] Step S24: The rotation of the machine tool spindle 4 drives the angle head 6 to rotate, which in turn drives the pressure regulating screw 733 to rotate and compress the hydraulic oil.

[0084] The spindle 4 rotates according to the parameters preset by the CNC system, driving the angle head 6 and the pressure adjusting screw 733 to rotate synchronously. The pressure adjusting screw 733, through its helical engagement with the nut, moves axially during rotation, squeezing the hydraulic oil inside the hydraulic assembly 73, causing the hydraulic oil pressure to gradually increase. This process converts the rotational power of the spindle 4 into the pressure energy of the hydraulic oil, providing a continuous and stable driving force for the subsequent clamping of the workpiece mounting plate 71 by the pressure block 731. Moreover, the rate of pressure increase can be precisely controlled by the rotational speed of the spindle 4, avoiding mechanical shock caused by sudden pressure increases.

[0085] Step S241: As the pressure increases, the piston moves downward, further pressing the pressure block against the workpiece mounting plate.

[0086] Step S25: When the hydraulic oil reaches the preset pressure, the machine tool spindle 4 stops rotating, and the machine tool drives the angle head 6 to retract the pressure adjusting screw 733, completing the hydraulic locking.

[0087] When the hydraulic oil pressure reaches the preset value, it indicates that the required locking force has been reached. At this point, the machine tool spindle stops rotating, stopping further compression of the pressure regulating screw, ensuring that the hydraulic locking effect can be stably maintained within the preset standard range, providing a reliable fixing guarantee for the processing of the workpiece.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of automatically centering a worktable, comprising: include: S1: Fix the ring-shaped workpiece (3) onto the workpiece mounting plate (71) of the self-aligning worktable (7); S2: The workpiece mounting plate (71) is locked by the hydraulic assembly (73); S3: The center position coordinates of the ring workpiece (3) are detected by the probe (5) and recorded as M. The front side of the ring workpiece (3) is then processed. S4: After the front side of the ring workpiece (3) is processed, the hydraulic assembly (73) is released, the ring workpiece (3) is flipped over and then fixed on the workpiece mounting plate (71). S5: Measure the center position coordinates of the ring workpiece (3) again through the probe (5) and record them as N, and calculate the position coordinate deviations (△X, △Y) of M and N through the CNC system. S6: Based on the coordinate deviation (△X, △Y), adjust the center position coordinate of the ring workpiece (3) from N to M using the self-aligning component (72); S7: The workpiece mounting plate (71) is locked again by the hydraulic assembly (73), and the back side of the annular workpiece (3) is processed.

2. The method of claim 1, wherein, The centering adjustment process of the centering component (72) in step S6 includes the following steps: S61: The angle head (6) is gripped by the machine tool spindle (4) and moved to the first direction adjustment screw; S62: Insert the internal hex wrench at the front end of the angle head (6) into the first direction adjusting screw; S63: According to the coordinate deviation △Y, the first direction adjustment screw is rotated by rotating the angle head (6), which in turn drives the first direction lower slider (726) and the first direction upper slider (722) to move. The first direction upper slider (722) and the first direction lower slider (726) squeeze the X direction slider to complete the Y direction adjustment of the ring workpiece (3). S64: The machine tool (1) drives the angle head (6) to exit the first direction adjustment screw and approach the second direction adjustment screw. The internal hex wrench at the front end of the angle head (6) is inserted into the second direction adjustment screw. S65: According to the coordinate deviation △X, the angle head (6) is rotated to drive the second direction adjustment screw to rotate, which in turn drives the second direction lower slider (729) and the second direction upper slider (725) to move. The second direction upper slider (725) and the second direction lower slider (729) squeeze the Y direction slider to complete the X direction adjustment of the ring workpiece (3). S66: The angle head (6) is driven out of the second direction adjustment screw by the machine tool (1) to complete the center position adjustment of the workpiece (3).

3. The method of claim 1, wherein, The self-aligning assembly (72) includes an X-axis slider (721) and a Y-axis slider (724). The X-axis slider (721) and the Y-axis slider (724) are located in the same plane and are both fixedly connected to the workpiece mounting plate (71). The X-axis slider (721) and the Y-axis slider (724) are used to drive the workpiece mounting plate (71) to slide together in the Y direction or the X direction, respectively.

4. The method of claim 3, wherein, The self-aligning assembly (72) further includes a self-aligning support base (720), a first upward slider (722), a first downward slider (726), a second upward slider (725), and a second downward slider (729). The self-aligning support base (720) has a hollow cross-shaped groove in the middle. The cross-shaped groove includes a first direction slide and a second direction slide that intersect each other. The first upward slider (722) and the first downward slider (726) are respectively placed on the first direction slide and connected by a first connecting rod (723). The second upward slider (725) and the second downward slider (729) are respectively placed on the second direction slide and connected by a second connecting rod (723). The two connecting rods (723) are distributed vertically within the cross-shaped groove.

5. The automatic table alignment method according to claim 4, characterized in that, Both the first upward slider (722) and the first downward slider (726) are provided with X-direction grooves. The X-direction slider (721) is disposed in the X-direction groove and can slide along the X direction. Both the second upward slider (725) and the second downward slider (729) are provided with Y-direction grooves, and the Y-direction slider (724) is disposed in the Y-direction groove and can slide along the Y direction; The first direction is set at an angle to the X direction, the second direction is set at an angle to the Y direction, and the first direction and the second direction are perpendicular to each other.

6. The automatic table alignment method according to claim 5, characterized in that, The X-direction grooves on the first upward slider (722) and the first downward slider (726) are arranged parallel to each other, and each X-direction groove is provided with an X-direction slider (721). The Y-direction grooves on the second direction slider (725) and the second direction downward slider (729) are arranged parallel to each other, and each Y-direction groove is provided with a Y-direction slider (724).

7. The automatic table alignment method according to claim 6, characterized in that, The self-aligning assembly (72) further includes a first direction lead screw (727), a first direction nut (728), a second direction lead screw (7210), and a second direction nut (7211) fixed on the self-aligning support (720). The first direction lead screw (727) cooperates with the first direction nut (728) and is connected to the first direction sliding block (726). The first direction sliding block (726) can be driven to slide along the first direction by rotating the first direction lead screw (727). The second direction lead screw (7210) cooperates with the second direction nut (7211) and is connected to the second direction lower slider (729). By rotating the second direction lead screw (7210), the second direction lower slider (729) can be driven to slide along the second direction.

8. The automatic table alignment method according to claim 6, characterized in that, A flat needle roller bearing is provided between the first upward slider (722) and the self-aligning support (720), between the first downward slider (726) and the self-aligning support (720), between the second upward slider (725) and the self-aligning support (720), between the second downward slider (729) and the self-aligning support (720), between the X-axis slider (721) and the X-axis groove, and between the Y-axis slider (724) and the Y-axis groove.

9. The automatic table alignment method according to claim 1, characterized in that, The self-aligning worktable (7) includes a workpiece mounting plate (71), a self-aligning assembly (72), and a hydraulic assembly (73). The self-aligning assembly (72) is connected between the workpiece mounting plate (71) and the hydraulic assembly (73). The workpiece mounting plate (71) is used to mount the ring-shaped workpiece (3). The hydraulic assembly (73) includes a base (732), a piston (738), a pressure block (731), a piston (738) end cap (736), and a pressure regulating screw (733). A hydraulic pipeline is installed inside the base (732), filled with hydraulic oil and connected to the piston (738). The pressure regulating screw (733) extends into the hydraulic pipeline. The locking process of the hydraulic assembly (73) in step S2 includes the following steps: S21: Grab the angle head (6) through the machine tool spindle (4); S22: The angle head (6) is driven by the machine tool (1) to approach the pressure regulating screw (733); S23: Insert the internal hex wrench at the front end of the angle head (6) into the pressure adjusting screw (733); S24: The rotation of the machine tool spindle (4) drives the angle head (6) to rotate, which in turn drives the pressure regulating screw (733) to rotate and compress the hydraulic oil; S25: When the hydraulic oil reaches the preset pressure, the machine tool spindle (4) stops rotating, and the machine tool (1) drives the angle head (6) to withdraw the pressure adjusting screw (733) to complete the hydraulic locking.

10. The automatic table alignment method according to claim 1, characterized in that, In step S1, the self-aligning worktable (7) is fixed on the rotary worktable (2), and the rotary worktable (2) is fixed on the CNC machine tool (1).

11. The automatic table alignment method according to claim 1, characterized in that, In step S3, the probe (5) is fixed on the machine tool spindle (4), and the machine tool spindle (4) drives the probe (5) to complete the detection of the center position coordinates of the ring workpiece (3) and stores the detected center position coordinates in the CNC system.

12. The automatic table alignment method according to claim 1, characterized in that, The loosening of the hydraulic component (73) in step S4 is the reverse process of the locking of the hydraulic component (73) in step S2, and is completed by the angle head (6) driving the pressure adjusting screw (733) to rotate in the opposite direction.

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