Turning methods for workpieces, machining systems for workpieces, and storage media.

Abstract

This invention relates to a method for turning a workpiece rotating about a rotation axis. A first moving device is driven to move a turning tool radially along the rotation axis, positioning the tool tip at a first radial position. A second moving device is driven to move the turning tool parallel to the rotation axis, causing the turning tool to move in the opposite direction and retract from the workpiece after turning. The machined dimensions of the workpiece are measured and the error compared to the target dimensions is calculated. A third moving device is driven to move the turning tool radially relative to the first moving device along the rotation axis, positioning the tool tip at a second radial position to correct the error. The second moving device is then driven to move the turning tool parallel to the rotation axis to perform turning on the workpiece.

Description

Technical Field

[0001] This invention relates to a turning method, a machining system, and a machining program for turning a workpiece held by a spindle device and rotating about a rotation axis. Background Technology

[0002] In radial machining, when narrow dimensional tolerances are required, such as less than 10 μm, it is generally necessary to perform turning with a grinding allowance in advance, followed by repeated grinding and dimensional measurements to bring the finished dimension within the tolerance relative to the target dimension. On the other hand, in order to perform radial machining with high precision using only turning, it is necessary to control the relative movement error between the spindle and the turning tool.

[0003] For example, Patent Document 1 discloses a machining apparatus (compound lathe) equipped with a mechanism for finely adjusting the distance between the tool post and the rotation axis of the spindle, so that the wear amount can be corrected without replacing the worn tool (lathe tool) during keyway machining. A machine base is mounted on a transverse tool post that can slide along the rotation axis of the spindle, and is vertically and horizontally slidably mounted relative to this rotation axis. A bar-shaped tool is fixed to the tool post mounted on this machine base in a manner extending perpendicular to the rotation axis. According to this apparatus, the bar-shaped tool can be statically or dynamically moved forward and backward along its long side, enabling fine adjustments to the outer diameter and roundness of the workpiece.

[0004] Patent Document 1: Japanese Patent Publication No. 58-137542 Summary of the Invention

[0005] In machining processes requiring narrow dimensional tolerances, as described in Patent Document 1, if the measured dimensions after machining do not converge within the tolerance, the distance between the tool holder and the spindle's rotation axis is finely adjusted for the next workpiece to be machined. However, due to the temperature rise caused by the machining operation, thermal displacement occurs, altering the positional relationship between the rotation axis and the tool holder. Therefore, in subsequent machining, it may not be possible to obtain an appropriate distance with the same adjustment amount. Furthermore, because the distance is finely adjusted based on the measured dimensions after machining, it is difficult to bring the initially machined workpiece within the dimensional tolerance. To solve this problem, grinding is performed after the turning process described above. However, grinding to complement the turning process requires a long processing time; therefore, it is desirable to perform machining in a short time using only turning.

[0006] The purpose of this invention is to provide a turning process, a turning procedure, and a turning system capable of performing machining with narrow dimensional tolerances.

[0007] The turning method of the present invention performs turning machining on a workpiece rotating about a rotation axis. The method includes: driving a first moving device to move the turning tool radially along the rotation axis, positioning the tool tip at a first radial position; driving a second moving device to move the turning tool parallel to the rotation axis, causing the turning tool to move in the opposite direction and retract from the workpiece after turning; measuring the workpiece's machining dimensions and calculating the error with the target dimensions; driving a third moving device to move the turning tool radially relative to the first moving device along the rotation axis, positioning the tool tip at a second radial position to correct the error; and driving the second moving device to move the turning tool parallel to the rotation axis to perform turning machining on the workpiece.

[0008] Furthermore, the machining system of the present invention includes: a machining apparatus for turning a workpiece; a measuring apparatus for measuring the machining dimensions of the workpiece; and a control apparatus for controlling the drive of the machining apparatus and the measuring apparatus. The machining apparatus includes: a spindle assembly for rotating the workpiece about a rotation axis; a first moving device for moving a turning tool radially along the rotation axis; a second moving device for moving the turning tool parallel to the rotation axis; and a third moving device having a smaller range of motion in the radial direction of the rotation axis than the first moving device, for moving the turning tool relative to the first moving device radially along the rotation axis. The control apparatus controls the drive of the machining apparatus and the measuring apparatus to perform the above-described workpiece turning method.

[0009] In addition, the machining process of the present invention includes instructions to cause the machining device to perform the above-described machining method, the machining device comprising: a first moving device for moving the turning tool radially along the rotation axis of the workpiece; a second moving device for moving the turning tool parallel to the rotation axis; and a third moving device for moving the turning tool radially relative to the first moving device along the rotation axis.

[0010] In addition, another turning method of the present invention performs turning on a workpiece rotating about a rotation axis, wherein a second moving device is driven to move the turning tool parallel to the rotation axis, the tool tip of the turning tool is positioned at a first axial position in a direction parallel to the rotation axis, a first moving device is driven to move the turning tool radially along the rotation axis, the turning tool is moved in the opposite direction to retract from the workpiece after turning, the machining dimension of the workpiece is measured and the error with the target dimension is calculated, a fourth moving device is driven to move the turning tool relative to the second moving device parallel to the rotation axis, the tool tip of the turning tool is positioned at a second axial position to correct the error, and the first moving device is driven to move the turning tool radially to perform turning on the workpiece.

[0011] In addition, other machining systems of the present invention include: a machining apparatus for turning a workpiece; a measuring apparatus for measuring the machining dimensions of the workpiece; and a control apparatus for controlling the drive of the machining apparatus and the measuring apparatus. The machining apparatus includes: a spindle assembly for rotating the workpiece about a rotation axis; a first moving device for moving a turning tool radially along the rotation axis; a second moving device for moving the turning tool parallel to the rotation axis; and a fourth moving device having a smaller range of motion than the second moving device in a direction parallel to the rotation axis, for moving the turning tool relative to the second moving device parallel to the rotation axis. The control apparatus controls the drive of the machining apparatus and the measuring apparatus to perform the other turning machining method described above.

[0012] In addition, other processing procedures of the present invention include instructions to cause the processing device to perform other turning processing methods described above, the processing device comprising: a first moving device for moving the turning tool radially along the rotation axis of the workpiece; a second moving device for moving the turning tool parallel to the rotation axis; and a fourth moving device for moving the turning tool relative to the second moving device and parallel to the rotation axis.

[0013] According to these inventions, it is possible to perform machining requiring narrow dimensional tolerances by turning alone, without grinding. Attached Figure Description

[0014] Figure 1 This is a side view (partial block diagram) of the main parts of an embodiment of the turning system of the present invention. Figure 2 This is a flowchart illustrating the turning process. Figure 3A This is a side view showing the configuration of the tool tip towards the cutting position in a turning machining method. Figure 3B This is a side view representing the semi-finishing process in turning. Figure 3C This is a side view showing the tool tip leaving the workpiece surface during a turning process. Figure 3D It is a side view showing the retraction of the turning tool in a turning machining process. Figure 4A It is a side view showing the dimensional measurements in the turning process. Figure 4B This is a side view representing the finishing process in turning. Figure 4C This is a side view showing the end of the finishing process in a turning machining method. Figure 5 This is a cross-sectional view showing an example of the arrangement of the workpiece and the turning tools. Figure 6This is a side view showing the state of the vibration damping components in a long workpiece configuration. Figure 7 This is a side view of the main part of another embodiment of the turning system of the present invention. Figure 8A This is a side view showing the configuration of the tool tip towards the cutting position in a turning machining method. Figure 8B This is a side view representing the semi-finishing process in turning. Figure 8C This is a side view showing the tool tip leaving the workpiece surface during a turning process. Figure 8D It is a side view showing the retraction of the turning tool in a turning machining process. Figure 9A It is a side view showing the dimensional measurements in the turning process. Figure 9B This is a side view representing the finishing process in turning. Figure 9C This is a side view showing the end of the finishing process in a turning machining method. Detailed Implementation

[0015] The following is for reference Figures 1 to 6 The present invention describes in detail the turning method, machining system, and machining procedure for the workpiece.

[0016] First, refer to Figure 1 Explain the composition of the processing system.

[0017] like Figure 1 As shown, the machining system 1 includes a machining machine 10 and a control device 2 that controls the movement of the machining machine 10. The control device 2 drives the machining machine 10 according to a pre-stored machining program 3, enabling the machining machine 10 to automatically perform turning machining on the workpiece W. Additionally, a robot 20 serving as a measuring device is located outside the machining machine 10. This robot 20 is used to measure the machining dimensions of the workpiece W, and its drive is also controlled by the control device 2. Here, the control device 2 can also be located in multiple places and consists of control circuits connected via communication units. For example, partial or complete control of the robot 20's drive can also be performed by a control circuit located in a different place than the control circuit controlling the drive of the machining machine 10.

[0018] The machining machine 10 includes: a spindle assembly 11 that holds a workpiece W and rotates it about a rotation axis A; a turret or tool holder 13 that holds a turning tool 12; a first moving device 14 that moves the turning tool 12 and the tool holder 13 radially along the rotation axis A and adjusts the position of the tool tip 12a of the turning tool 12; and a second moving device 16 that moves the turning tool 12, the first moving device 14, and the tool holder 13 parallel to the rotation axis A and adjusts the position of the tool tip 12a of the turning tool 12. Furthermore, a third moving device 15 is provided between the tool holder 13 and the turning tool 12, enabling relative movement of the turning tool 12 relative to the tool holder 13. The turning tool 12 is configured to be substantially parallel to the rotation axis A.

[0019] Here, the second moving device 16 includes a carriage 8, linear guides 7, a ball screw 6, and a servo motor 5. The carriage 8 is mounted on two linear guides 7 that extend parallel to the rotation axis A on the base 4 of the machining machine 10, and slides freely along the linear guides 7, thereby engaging with the ball screw 6 that extends parallel to the rotation axis A. The ball screw 6 is connected to the servo motor 5, and by driving the servo motor 5 to rotate, the carriage 8 can move parallel to the rotation axis A.

[0020] Furthermore, the first moving device 14 includes a tool holder 9 connected to the tool holder 13, linear guides 19, a ball screw 18, and a servo motor 17. The tool holder 9 is mounted on two linear guides 19 that extend radially along the rotation axis A on the carriage 8 of the second moving device 16, slides freely along the linear guides 19, and is screwed onto the ball screw 18 that extends parallel to the linear guides 19. The ball screw 18 is connected to the servo motor 17, and rotates by driving the servo motor 17, enabling the tool holder 9 of the first moving device 14 to move radially relative to the carriage 8 of the second moving device 16 along the rotation axis A.

[0021] The first moving device 14 allows the turning tool 12 to move radially relative to the workpiece W to be turned along the rotation axis A, adjusting the radial position of its cutting tip 12a. Furthermore, the second moving device 16 allows the turning tool 12 to move relative to the workpiece W in a direction parallel to the rotation axis A, adjusting the axial position of its cutting tip 12a. This allows the cutting tip 12a of the turning tool 12 to be adjusted towards the cutting position, providing feed for the turning operation. The first moving device 14 and the second moving device 16 need to ensure sufficient movement corresponding to the size of the workpiece W, for example, having a range of motion of 100 mm or more respectively, to accommodate feed, retraction, etc., accompanying such turning operations.

[0022] Furthermore, the third moving device 15 enables the turning tool 12 to move radially relative to the first moving device 14 along the rotation axis A. Preferably, the positional accuracy of the third moving device 15 is higher than that of the first moving device 14, and it has a smaller range of motion than the first moving device 14. The third moving device 15 has a range of motion that can correct for errors in the machining dimensions caused by semi-finishing the workpiece W based on the positional accuracy of the first moving device 14 during finishing, and can determine the position of the tool tip 12a with high precision. The range of motion of the third moving device 15 can be set to, for example, less than 1 mm. That is, the range of motion of the third moving device 15 can be set to less than 1 / 100 of the range of motion of the first moving device 14. As a result, the position of the tool tip 12a adjusted by the first moving device 14 can be further finely adjusted radially along the rotation axis A. The driving method for the third moving device 15 can be, for example, a driving method based on the elastic deformation of a tool holder using hydraulic pressure, a driving method based on a linear motor, or a driving method based on a slider engaged with a ball screw rotated by a servo motor.

[0023] The robot 20, which serves as a measuring device, has a measuring instrument 22 at the front end of its robot arm 21. This instrument can be inserted from outside the machine into the machining machine 10 according to drive commands from the control device 2 to measure the machining dimensions of the workpiece W held by the spindle device 11. For example, a pneumatic micrometer using an air-type pneumatic gauge can be appropriately used for the measuring instrument 22.

[0024] Next, as part of the operation of processing system 1, according to Figure 2 The method for turning the outer or inner circumferential surface of workpiece W will be described with reference to Figures 3 and 4. Furthermore, workpiece W is held by the spindle assembly 11 after rough machining has been completed.

[0025] exist Figure 2 Refer to the middle section together Figure 3A This causes the workpiece W, held by the spindle assembly 11, to rotate about the rotation axis A. Then, the first moving device 14 (see reference) is driven. Figure 1 The cutting tool tip 12a of the turning tool 12 mounted on the tool holder 13 is positioned at the semi-finishing entry position of the workpiece W for positioning (S1). Here, the semi-finishing entry position is determined by a position in the radial direction that allows for finishing allowance relative to the target size of the finishing process, taking into account the positional accuracy of the first moving device 14, and a position in the axial direction parallel to the rotation axis A for starting the turning process. This axial position is adjusted using the second moving device 16.

[0026] Then, as Figure 3BAs shown, the second moving device 16 is driven to move the turning tool 12 mounted on the tool holder 13 together with the first moving device 14 along the moving axis A' parallel to the rotation axis A toward the first direction DR1 toward the spindle device 11, and to perform turning machining on the workpiece W as a semi-finishing process (S2).

[0027] Here, as Figure 3C As shown, after turning to the specified position, it is preferable to drive the third moving device 15 to move the tool tip 12a away from the surface of the workpiece W.

[0028] Next, as Figure 3D As shown, the second moving device 16 is driven to move the tool holder 13 in the opposite direction of the first direction DR1 (i.e., the second direction DR2) along the moving axis A' parallel to the rotation axis A, causing the turning tool 12 to retract from the vicinity of the workpiece W (S3). At this time, the drive of the first moving device 14 is fixed, and the tool holder 13 does not move radially. During this retraction, as described above, the third moving device 15 is driven to move the tool tip 12a away from the surface of the workpiece W, thereby preventing the generation of a return mark. Alternatively, it may not be necessary to prevent the generation of a return mark, and the drive of the third moving device 15 for moving the tool tip 12a away from the surface of the workpiece W can be omitted.

[0029] Next, as Figure 4A As shown, the machining dimension of workpiece W is measured (S4). Here, the robot 20, which serves as a measuring device, is driven to insert the robot arm 21 from outside the machining machine 10, bringing the measuring device 22 close to the workpiece W for measurement. By retracting the turning tool 12 as described above, the measuring device 22 can be brought close to the workpiece W. Alternatively, instead of the robot 20, a measuring device built into the machine can be used, or the measurement can be performed manually by an operator. The measured machining dimension is input as a measurement result to the control device 2.

[0030] In control device 2, the radial position (S5) of the entry position for the next finishing machining is calculated based on the measurement results of the machining dimensions of workpiece W. Specifically, the radial position is determined to correct the error between the target value of the finishing dimension and the measured machining dimension. Then, the third moving device 15 is driven to adjust the position of the turning tool 12 so that the tool tip 12a is positioned at the determined radial position.

[0031] Next, as Figure 4B As shown, for finishing, the second moving device 16 is driven to move the turning tool 12 mounted on the tool holder 13 again in the first direction DR1 along the moving axis A' parallel to the rotation axis A, and the workpiece W is turned (S6).

[0032] Then, as Figure 4CAs shown, the turning process is completed at the specified position, and the finishing process is finished. After the finishing process is completed, the third moving device 15 can be driven to make the tool tip 12a leave the surface of the workpiece W.

[0033] Then, the turning tool 12 is retracted (S7), and the finishing dimension is measured (S8). Here, if the finishing dimension converges within the dimensional tolerance, the first moving device 14 and the second moving device 16 are returned to the origin, and the turning process ends (S9: "Yes"). At this time, a correction value for the error in the finishing dimension caused by the third moving device 15 can also be calculated and used for the next finishing process.

[0034] If the finishing dimension does not converge within the dimensional tolerance, the remaining cutting allowance is checked (S9: "No"). If the measured finishing dimension is smaller than the specified size and no cutting allowance is left (S10: "Yes"), an alarm is issued and the process ends. On the other hand, if the finishing dimension is larger than the specified size and a cutting allowance is left (S10: "No"), the calculation of the finishing entry position is returned (S5) and repeated. In addition, the driving of the machining machine 10 and the robot 20 is based on instructions from the control device 2 according to the machining program 3.

[0035] If turning is performed using the method described above, the turning tool 12 is not moved by the first moving device 14 from the semi-finishing positioning (S1) to the finishing (S6). In other words, the first moving device 14 remains in a fixed position at least until the finishing (S6). Therefore, in the finishing process, the radial dimensional accuracy is independent of the positional accuracy of the first moving device 14, but depends on the positional accuracy of the third moving device 15. As described above, the third moving device 15 has a higher positional accuracy than the first moving device 14, enabling turning to be performed with such high positional accuracy. Therefore, it is also possible to meet requirements for narrow dimensional tolerances, such as 10 μm or less. That is, it is possible to perform machining requiring narrow dimensional tolerances solely through turning without grinding.

[0036] Furthermore, when multiple workpieces W are continuously turned, it is also possible to consider not moving the first moving device 14, but limiting the movement of the second moving device 16 to only the direction parallel to the rotation axis A, and performing finishing using the same correction value, thereby omitting the dimensional measurement after semi-finishing. However, it is also conceivable that the radial dimensional accuracy would decrease due to the thermal displacement of the machining machine 10 caused by repeated machining and the repeated movement of the second moving device 16 along the direction parallel to the rotation axis A. Therefore, it is preferable to perform dimensional measurement after semi-finishing for each workpiece W (S4).

[0037] Furthermore, thermal displacement may also occur in the third moving device 15 due to the continuous turning of multiple workpieces W. On the other hand, as described above, the third moving device 15 has a small range of motion. Therefore, compared with the thermal displacement of the first moving device 14 and the second moving device 16, which have large ranges of motion, the thermal displacement generated by the third moving device 15 is very small. Therefore, even in the case of thermal displacement due to continuous machining, machining requiring narrow dimensional tolerances can be performed according to the above-described turning method.

[0038] In addition, such as Figure 5 As shown, the turning tool 12 is preferably configured to extend substantially parallel to the rotation axis A. With this configuration, turning can also be performed in the recess C formed on the circumference of the workpiece W centered on the rotation axis A using the method described above. That is, the cutting tip 12a of the turning tool 12 is inserted into the recess C, and its inner and outer peripheral walls are turned. Thus, even in cases where it is difficult to insert a grinding wheel into the recess of the workpiece, or even if it can be inserted but grinding takes time, machining requiring narrow dimensional tolerances can be performed automatically and continuously.

[0039] like Figure 6 As shown, when turning a workpiece W that is relatively long along the direction of rotation axis A, a vibration damping member 19 supporting the workpiece W can be arranged between the spindle assembly 11 and the cutting tool 12 at the entry position of the workpiece W, just like in other turning operations. Even with this arrangement, the same turning operation as described above can be performed.

[0040] Furthermore, even when only finishing is performed without semi-finishing, by using the same method starting from the measurement of the aforementioned machining dimensions (S4), machining requiring narrow dimensional tolerances can be performed solely through turning. Additionally, the aforementioned turning method can be used for turning the inner and outer circumferential surfaces of a workpiece. The machining machine 10 can be other types of machining machines such as the aforementioned turret lathe or a multi-functional machining center.

[0041] Next, the turning method for the end face of the workpiece orthogonal to the axis of rotation A will be explained. First, the composition of the machining machine will be explained.

[0042] like Figure 7As shown, the machining machine 10' is identical to the machining machine 10 described above, except for a few parts. The main difference is that instead of the third moving device 15 that moves the turning tool 12 radially along the rotation axis A, it has a fourth moving device 15' that moves the turning tool 12' parallel to the rotation axis A. Specifically, the machining machine 10' changes the turning tool along with the moving device in the tool holder 13, relative to the machining machine 10. When the tool holder 13 is a turret, this change can be completed by rotating the turret. Other components, such as the first moving device 14 and the second moving device 16, are the same as those in the machining machine 10.

[0043] The fourth moving device 15' is also the same as the third moving device 15, and has a higher positional accuracy than the second moving device 16. Therefore, it is preferable that the fourth moving device 15' has a smaller range of motion than the second moving device 16. The fourth moving device 15' has a range of motion capable of correcting errors in machining dimensions caused by semi-finishing of the workpiece W based on the positional accuracy of the second moving device 16 during finishing, and can determine the position of the tool tip 12'a with high precision. For example, the range of motion of the fourth moving device 15' can be less than 1 mm. That is, the range of motion of the fourth moving device 15' can be less than 1 / 100 of the range of motion of the second moving device 16.

[0044] The other details of the fourth moving device 15' are the same as those of the third moving device 15, so the description is omitted.

[0045] Next, the method of turning the end face of the workpiece W using machining machine 10' will be explained.

[0046] exist Figure 2 Refer to the middle section together Figure 8A This causes the workpiece W, held by the spindle assembly 11, to rotate about the rotation axis A. Then, the second moving device 16 (see reference) is driven. Figure 7 The cutting tool tip 12'a of the turning tool 12' mounted on the tool holder 13 is positioned at the entry position in the semi-finishing of the workpiece W, and is positioned (S1). Here, the entry position in the semi-finishing is determined by the position in the axial direction parallel to the rotation axis A, which has a finishing allowance relative to the target dimension of the finishing process considering the positional accuracy of the second moving device 16, and the radial position in the radial direction of the rotation axis A for starting the feed in the turning process. This radial position is adjusted using the first moving device 14.

[0047] Then, as Figure 8B As shown, the first moving device 14 is driven to move the turning tool 12' mounted on the tool holder 13 along the radial moving axis R of the rotating axis A toward the rotation center of the rotating axis A of the workpiece W in the third direction DR3, and the end face of the workpiece W is turned as a semi-finishing process (S2).

[0048] Here, as Figure 8C As shown, after turning to the specified position, it is preferable to drive the fourth moving device 15' so that the tool tip 12'a leaves the surface of the workpiece W.

[0049] Next, as Figure 8D As shown, the first moving device 14 is driven to move the turning tool 12' mounted on the tool holder 13 in the fourth direction DR4, which is opposite to the third direction DR3 of the moving axis R along the radial direction of the rotation axis A, thereby retracting the turning tool 12' from the vicinity of the workpiece W (S3). At this time, the drive of the second moving device 16 is fixed, and the tool holder 13 does not move in the direction parallel to the rotation axis A. In this retraction, by driving the fourth moving device 15' as described above, the tool tip 12'a leaves the surface of the workpiece W, thus preventing the generation of a return mark. Alternatively, it is not necessary to prevent the generation of a return mark, and the drive of the fourth moving device 15' for removing the tool tip 12'a from the surface of the workpiece W can be omitted.

[0050] Next, as Figure 9A As shown, the machining dimension of workpiece W is measured (S4). For example, the distance between the end faces can be measured using a vernier caliper-shaped measuring instrument 22' as the machining dimension. The measured machining dimension is input to the control device 2 as the measurement result.

[0051] In control device 2, based on the measurement results of the machining dimensions of workpiece W, the axial position (S5) in the cutting position of the next finishing machining is calculated. Specifically, the axial position is determined to correct the error between the target value of the finishing dimension and the measured dimension. Then, the fourth moving device 15' is driven to adjust the position of the turning tool 12' so that the tool tip 12'a is positioned at the determined axial position.

[0052] Next, as Figure 9B As shown, as finishing, the first moving device 14 is driven to move the turning tool 12' mounted on the tool holder 13 again in the third direction DR3 along the radial moving axis R of the rotation axis A, and the end face of the workpiece W is turned (S6).

[0053] Then, as Figure 9C As shown, the turning process is completed at the specified position, and then finishing is finished. Other processes are the same as the turning process described above using machining machine 10, therefore, descriptions are omitted.

[0054] When turning is performed using the above method, the turning tool 12' is not moved by the second moving device 16 from the semi-finishing positioning (S1) to the finishing (S6). In other words, the second moving device 16 maintains its drive unchanged at least until the finishing (S6). Therefore, in the finishing process, the dimensional accuracy in the direction parallel to the rotation axis A is independent of the positional accuracy of the second moving device 16, but depends on the positional accuracy of the fourth moving device 15'. As described above, the fourth moving device 15' has higher positional accuracy than the second moving device 16, enabling turning to be performed with such high positional accuracy. Therefore, it is also possible to meet requirements for narrow dimensional tolerances, such as 10 μm or less. That is, it is possible to perform machining requiring narrow dimensional tolerances solely through turning without grinding.

[0055] The foregoing has described representative embodiments and variations thereof of the present invention, but the present invention is not necessarily limited thereto, and those skilled in the art can make appropriate modifications. That is, those skilled in the art can discover various alternative embodiments and modifications without departing from the scope of the appended claims. Explanation of reference numerals in the attached figures

[0056] 1: Machining system; 2: Control device; 3: Machining program; 10: Machining machine; 11: Spindle assembly; 12: Turning tool; 12a: Tool tip; 13: Tool holder; 14: First moving device; 15: Third moving device; 15': Fourth moving device; 16: Second moving device; 20: Robot (measuring device); A: Rotary axis; A': Moving axis; W: Workpiece.

Claims

1. A method for turning a workpiece, wherein the workpiece rotating about a rotation axis is turned, characterized in that, A first moving device that drives the turning tool to move radially along the rotation axis positions the tool tip at a first radial position in the radial direction. A second moving device drives the turning tool to move parallel to the rotation axis, causing the turning tool to move in the opposite direction and retract from the workpiece after turning it. Measure the machined dimensions of the workpiece and calculate the error between the machined dimensions and the target dimensions. A third moving device is driven to move the turning tool radially relative to the first moving device along the rotation axis, positioning the tool tip at a second radial position to correct the error. The third moving device has higher positional accuracy than the first moving device, and error correction is performed using only the third moving device while the first moving device is fixed. The second moving device is driven to move the turning tool parallel to the rotating axis to perform turning operations on the workpiece.

2. The turning method for a workpiece according to claim 1, characterized in that, The cutting tip of the turning tool is positioned at the first radial position, and the drive of the first moving device is fixed.

3. The turning method for a workpiece according to claim 1 or 2, characterized in that, The third moving device causes the turning tool to move relative to the first moving device by an amount corresponding to the error.

4. The turning method for a workpiece according to claim 1 or 2, characterized in that, The third moving device causes the turning tool to move relative to the first moving device within 1 mm.

5. The turning method for a workpiece according to claim 1 or 2, characterized in that, The recessed portion of the workpiece is machined by turning.

6. A method for turning a workpiece, wherein the workpiece rotating about a rotation axis is turned, characterized in that, A second moving device that drives the turning tool to move parallel to the rotation axis positions the tool tip at a first axial position in a direction parallel to the rotation axis. A first moving device that drives the turning tool to move radially along the rotation axis causes the turning tool to move in the opposite direction and retract from the workpiece after turning it. Measure the machined dimensions of the workpiece and calculate the error between the machined dimensions and the target dimensions. A fourth moving device is driven to move the turning tool relative to the second moving device and parallel to the rotation axis, positioning the tool tip at a second axial position to correct the error. The fourth moving device has higher positional accuracy than the second moving device, and error correction is performed using only the fourth moving device while the second moving device is fixed. The first moving device is driven to move the turning tool along the radial direction to perform turning operations on the workpiece.

7. The turning method for a workpiece according to claim 6, characterized in that, The cutting tip of the turning tool is positioned in the first axial position, and the drive of the second moving device is fixed.

8. The turning method for a workpiece according to claim 6 or 7, characterized in that, The fourth moving device causes the turning tool to move relative to the second moving device by an amount corresponding to the error.

9. The turning method for a workpiece according to claim 6 or 7, characterized in that, The fourth moving device causes the turning tool to move relative to the second moving device within 1 mm.

10. A machining system of a workpiece, characterized by, have: The machining equipment is used to perform turning operations on the workpiece; Measuring device for measuring the machining dimensions of a workpiece; as well as The control device controls the driving of the processing device and the measuring device. The processing apparatus includes: A spindle assembly that rotates the workpiece around a rotation axis; The first moving device causes the turning tool to move radially along the rotation axis; The second moving device moves the turning tool parallel to the rotation axis; and The third moving device has a smaller range of motion in the radial direction of the rotation axis than the first moving device, allowing the turning tool to move relative to the first moving device in the radial direction of the rotation axis. The third moving device has higher positional accuracy than the first moving device, and with the first moving device fixed, only the third moving device is used for error correction. The control device controls the drive of the machining device and the measuring device, so that the machining device and the measuring device perform the turning machining method of the workpiece according to any one of claims 1 to 5.

11. The workpiece machining system according to claim 10, characterized in that, The movable range of the third moving device is less than 1 / 100 of the movable range of the first moving device.

12. A system for machining a workpiece, comprising: have: The machining equipment is used to perform turning operations on the workpiece; A measuring device for measuring the machining dimensions of the workpiece; as well as The control device controls the driving of the processing device and the measuring device. The processing apparatus includes: A spindle assembly that rotates the workpiece around a rotation axis; The first moving device causes the turning tool to move radially along the rotation axis; The second moving device moves the turning tool parallel to the rotation axis; and The fourth moving device has a smaller range of motion than the second moving device in a direction parallel to the rotation axis, allowing the turning tool to move relative to the second moving device parallel to the rotation axis. The fourth moving device has higher positional accuracy than the second moving device, and with the second moving device fixed, only the fourth moving device is used for error correction. The control device controls the drive of the machining device and the measuring device, so that the machining device and the measuring device perform the turning machining method of the workpiece according to any one of claims 6 to 9.

13. The workpiece machining system according to claim 12, characterized in that, The movable range of the fourth moving device is less than 1 / 100 of the movable range of the second moving device.

14. A storage medium storing a processing program, characterized in that, The machining program includes instructions for the machining apparatus to perform a turning process on the workpiece as described in any one of claims 1 to 5. The processing apparatus includes: The first moving device moves the turning tool radially along the workpiece's axis of rotation; The second moving device moves the turning tool parallel to the rotation axis; and The third moving device causes the turning tool to move radially relative to the first moving device along the rotation axis.

15. A storage medium storing a processing program, characterized in that, The machining program includes instructions for the machining apparatus to perform a turning process on the workpiece as described in any one of claims 6 to 9. The processing apparatus includes: The first moving device moves the turning tool radially along the workpiece's axis of rotation; The second moving device moves the turning tool parallel to the rotation axis; and The fourth moving device causes the turning tool to move relative to the second moving device and parallel to the rotation axis.

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