An inner groove machining method for workpiece automatic positioning and accurate calibration

Abstract

The application discloses a kind of inner groove machining methods of workpiece automatic positioning and accurate calibration, including processing device, processing device includes workpiece spindle and tailstock, workpiece spindle is moved along X axis and Z axis respectively by first translation mechanism and second translation mechanism, measuring needle and groove grinding spindle are moved along Y axis by third translation mechanism, further include the following steps: S1, obtain the center O point coordinate of standard piece, blade slot processing coordinates and inner circle processing coordinates, S2, blank center is automatically corrected by headstock and tailstock;S3, the offset angle θ of blank is calculated by formula;S4, blank rotates θ;S5: blank is moved L2-L1 along X axis, and blade slot is processed.Compared with prior art, the application can automatically complete blade slot center correction and angle correction by processing device, with high efficiency, which is beneficial to batch processing of workpiece;Second, the layout of each component of processing device is ingenious, and the overall structure is simple, with low manufacturing difficulty.

Description

Technical Field

[0001] This invention relates to the field of internal circular blade groove machining technology, and in particular to an internal groove machining method that allows for automatic workpiece positioning and precise calibration. Background Technology

[0002] When grinding precision grooves in the circumferential direction of a blank, the angular error requirement between the groove and the center of the circle is extremely strict. (Refer to the attached...) Figure 3 A typical application is the machining of blade grooves in compressor cylinders. First, the blade grooves are preliminarily machined to obtain a blank. Then, the blade grooves on the blank are further machined to ensure that the angular error of the blade groove relative to the center meets the requirements, resulting in a standard part. In the process of obtaining the standard part from the blank, traditional methods often use the inner hole, outer circle, or pin hole of the blank for positioning, and then clamp it with the end face or outer circle. To ensure accuracy, the traditional approach requires first using a dial indicator to correct the center based on the inner hole, and then using the dial indicator to check the straightness of the groove to confirm that the angle is correct. Because the opening of this type of groove is extremely narrow, the manual correction process is extremely time-consuming and labor-intensive, severely restricting the feasibility of mass production. Summary of the Invention

[0003] This invention provides a method for machining inner grooves that can automatically position and accurately calibrate workpieces, thereby solving the problems of time-consuming, labor-intensive, inefficient, and difficult-to-mass-produce issues associated with manually correcting the blade groove angle of the inner circle of a blank.

[0004] This invention provides a method for automatically positioning and precisely calibrating an inner groove machining process for a workpiece, comprising a machining device including a workpiece spindle, a tailstock, and a support. The workpiece spindle moves along the X-axis and Z-axis respectively via a first translation mechanism and a second translation mechanism. The probe on the support and the groove grinding spindle both move along the Y-axis via a third translation mechanism. The method further includes the following steps:

[0005] S1: After installing the standard part on the headstock of the workpiece spindle, measure and calculate the coordinates (X0, Y0) of the center point O of the standard part, the machining coordinates of the blade groove and the inner circle, and the X-axis coordinate L1 when the groove grinding spindle is in the middle position inside the blade groove of the standard part.

[0006] S2: Manually install the blank on the headstock of the workpiece spindle. Move the headstock using the first translation mechanism to make the headstock and tailstock coaxial. Move the blank using the second translation mechanism. The tailstock extends into the inner circle of the blank. Then, when the headstock releases the blank, the tailstock clamps the blank. Finally, when the tailstock releases the blank, the headstock clamps the blank, so that the blank is coaxially set with the workpiece spindle.

[0007] S3: Rotate the blank so that the blade groove is located on the lower side of the blank. Move the blank to the probe and insert the probe into the blade groove. Based on the coordinates of the center point O, measure the coordinates of point B (X1, Y1) and point D (X2, Y2) on one side of the blade groove wall. Points B and D are distributed vertically. Then, calculate the offset angle θ of the blank using the arctangent function.

[0008] θ=arctan( );

[0009] S4: Rotate the blank about its axis by θ to correct the machining angle of the blade groove;

[0010] S5: Measure the coordinates of points E and F of the blade groove using a probe. Points E and F are located on the two groove walls of the blade groove and are on the same horizontal plane. Calculate the X-axis coordinate L2 of the midpoint between points E and F. Move the blank along the X-axis by L2-L1. Use the groove grinding spindle to process the blade groove of the blank according to the blade groove processing coordinates.

[0011] S6: Move the blank along the X-axis to make the inner circle spindle coaxial with the headstock, and then process the inner circle of the blank through the inner circle machining coordinates to obtain the standard part;

[0012] S7: Repeat steps S2-S6 to process the next blank into a standard part.

[0013] Preferably, in step S1, the coordinates of three points are measured on the inner circle of the standard part by a probe, and then the coordinates of the center O of the inner circle are calculated by the formula for determining the center of the circle by three points.

[0014] Preferably, in step S1, the L1 value is obtained by the following steps: mounting the standard part on the headstock, finding the middle position of the groove grinding spindle in the blade groove using a feeler gauge, and calculating the X-axis coordinate of the groove grinding spindle when it is in the middle position of the blade groove.

[0015] Preferably, in step S5, the L2 value is obtained through the following steps:

[0016] Move the blank along the X-axis and measure the coordinates of point E (X). e Y e ) and the coordinates of point F (X f Y f );

[0017] Then L2 is calculated using the following formula:

[0018] L2= .

[0019] Preferably, in step S5, machining the blade groove of the blank using a groove grinding spindle according to the blade groove machining coordinates includes the following steps:

[0020] Move the blank along the Z-axis, and according to the blade groove machining coordinates, use the grinding wheel on the groove grinding spindle to rough grind the A-side groove wall of the blade groove. After grinding, move the blank along the X-axis, and use the grinding wheel on the groove grinding spindle to finish grinding the A-side groove wall of the blade groove, thus completing the machining of the A-side groove wall of the blade groove.

[0021] Then, the blank is moved along the X-axis, and the grinding wheel on the groove grinding spindle is used to finely grind the other side of the blade groove wall to complete the machining of the blade groove.

[0022] Preferably, in step S3, the insertion of the probe into the blade groove includes the following steps:

[0023] Move the blank along the X-axis and the probe along the Y-axis to initially align the probe with the blade groove of the blank. Move the blank along the Z-axis to insert the probe into the blade groove of the blank.

[0024] Preferably, in step S3, based on the coordinates of the center O, the blank is moved along the X-axis and the probe is moved along the Y-axis to measure the coordinates of points B and D on the groove wall of the blade groove.

[0025] Preferably, in step S4, rotating the blank about its axis by θ to correct the machining angle of the blade groove includes the following steps:

[0026] If X1 > X2, then the blank is rotated counterclockwise by θ around its axis to correct the angle of the blade slot.

[0027] If X2 > X1, then rotate the blank around its axis clockwise by arctan(X1 / X2). The angle of the blade groove is corrected.

[0028] Preferably, the first translation mechanism, the second translation mechanism, and the third movement mechanism are all equipped with grating rulers.

[0029] Preferably, the first translation mechanism includes a slide table that slides along a first guide rail, the workpiece spindle is mounted on the slide table, and a first drive mechanism is provided on the slide table.

[0030] Preferably, the second translation mechanism includes a saddle, the first guide rail is fixed above the saddle, the saddle slides along the second guide rail, a worktable is provided below the saddle, and a second drive mechanism is provided between the worktable and the saddle.

[0031] Compared with existing technologies, this invention first automatically corrects the center of the blank by coordinating the headstock and tailstock. Then, it measures two points on one side of the blade groove wall using a probe and calculates the offset angle θ using the arctangent function. After the blank rotates by θ to correct the blade groove angle, the probe measures the coordinates of two points on the two groove walls on the same horizontal plane of the blade groove, and calculates the X-axis coordinate L2 of the midpoint of the blade groove at this time. Then, the blank is moved along the X-axis L2-L1 to complete the blade groove machining. Finally, the blank is moved to the inner circle spindle to complete the inner circle machining. This invention does not require manual correction of the blank's center or the use of a dial indicator to check the straightness of the blade groove to determine if the workpiece angle is correct. This invention can automatically complete the blade groove center correction and angle correction through the processing device, which is highly efficient and beneficial for batch processing of workpieces. Furthermore, the various components of the processing device are cleverly arranged, the overall structure is simple, and the manufacturing difficulty is low. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is a schematic diagram of the structure of the processing device for the blank part of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the standard component of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the blank part of the present invention.

[0036] Figure label:

[0037] 1. Stylus, 2. Workpiece spindle, 3. First translation mechanism, 4. Second translation mechanism, 5. Third moving mechanism, 31. Slide table, 32. First guide rail, 41. Saddle, 42. Second guide rail, 43. Second drive mechanism, 6. Worktable, 7. Support, 8. Groove grinding spindle, 9. Inner circle spindle, 10. Inner circle finishing spindle, 100. Blank, 200. Blade groove, 300. Standard part. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0039] See attached document Figure 1 This embodiment provides a method for machining an inner groove with automatic workpiece positioning and precise calibration, including a machining device. The machining device includes a workpiece spindle 2, a tailstock, and a support 7. The workpiece spindle 2 moves along the X-axis and Z-axis respectively via a first translation mechanism 3 and a second translation mechanism 4. The probe 1 and the groove grinding spindle 8 are mounted on the support 7. The support 7 moves along the Y-axis via a third translation mechanism. The method also includes the following steps:

[0040] S1: After installing the standard part 300 on the headstock of the workpiece spindle 2, measure and calculate the coordinates (X0, Y0) of the center point O of the standard part 300, the machining coordinates of the blade groove 200 and the inner circle machining coordinates, as well as the X-axis coordinate L1 of the groove grinding spindle 8 when it is in the middle position inside the blade groove 200 of the standard part 300.

[0041] S2: Manually install the blank 100 on the headstock of the workpiece spindle 2. Move the headstock using the first translation mechanism 3 to make the headstock and tailstock coaxial. Move the blank 100 using the second translation mechanism 4, and the tailstock extends into the inner circle of the blank 100. Then, when the headstock releases the blank 100, the tailstock clamps the blank 100. Finally, when the tailstock releases the blank 100, the headstock clamps the blank 100, so that the blank 100 is coaxially set with the workpiece spindle 2.

[0042] S3: See Appendix Figure 3 Rotate the blank 100 so that the blade groove 200 is located on the lower side of the blank 100, with the groove opening of the blade groove 200 facing upwards. Move the blank 100 to the probe 1 and insert the probe 1 into the blade groove 200. Based on the coordinates of the center point O, measure the coordinates of point B (X1, Y1) and point D (X2, Y2) on one side of the groove wall of the blade groove 200. Points B and D are distributed vertically. Then, calculate the offset angle θ of the blank 100 using the arctangent function.

[0043] θ=arctan( );

[0044] S4: Rotate the blank 100 around its axis by θ to correct the machining angle of the blade groove 200;

[0045] S5: Measure the coordinates of points E and F of the blade groove 200 using probe 1. Points E and F are located on the two groove walls of the blade groove 200 and are on the same horizontal plane, meaning that the Y-axis coordinates of points E and F are the same. Calculate the X-axis coordinate L2 of the midpoint between points E and F. Move the blank 100 along the X-axis by L2-L1. At this time, the groove grinding spindle 8 is located in the middle position of the blade groove 200. Use the groove grinding spindle 8 to process the blade groove 200 of the blank 100 according to the machining coordinates of the blade groove 200.

[0046] S6: Move the blank 100 along the X-axis so that the inner circle spindle 9 is coaxial with the headstock. Then, process the inner circle of the blank 100 through the inner circle machining coordinate to obtain the standard part 300.

[0047] S7: Repeat steps S2-S6 to process the next blank part 100 into standard part 300.

[0048] This invention first measures and calculates the coordinates of the center O of the inner circle, the machining coordinates of the blade groove 200, the machining coordinates of the inner circle, and the L1 value using the standard part 300. This provides a basis for the subsequent correction of the blade groove 200 angle, the machining of the blade groove 200, and the machining of the inner circle in the blank part 100. The coordinates of the center O, the machining coordinates of the blade groove 200, the machining coordinates of the inner circle, and the L1 value only need to be calculated once, and do not need to be remeasured and calculated during the subsequent machining of the blank part 100. This invention first automatically corrects the center of the blank 100 through the cooperation of the headstock and tailstock. Then, it measures two points on one side of the blade groove 200 using a probe 1 and calculates the offset angle θ using the arctangent function. After the blank 100 rotates by θ to correct the angle of the blade groove 200, the probe 1 measures the coordinates of two points on the two groove walls on the same horizontal plane of the blade groove 200, and calculates the X-axis coordinate L2 of the midpoint of the blade groove 200 at this time. Then, the blank 100 is moved along the X-axis by L2-L1 to complete the machining of the blade groove 200. Finally, the blank 100 is moved to the inner circle spindle 9 to complete the inner circle machining. This invention does not require manual correction of the center of the blank 100, nor does it require dial gauge calibration to determine the straightness of the blade groove 200 to ensure the correctness of the workpiece angle. This invention can automatically complete the center correction and angle correction of the blade groove 200 through the machining device, which is highly efficient and conducive to batch processing of workpieces. Furthermore, the various components of the machining device are cleverly arranged, the overall structure is simple, and the manufacturing difficulty is low.

[0049] As another embodiment of the present invention: refer to the appendix Figure 1 In step S1, the coordinates of three points are measured on the inner circle of the standard part 300 using probe 1. Then, the coordinates of the center O of the inner circle are calculated using the formula for determining the center of a circle from three points. For example, the coordinates of the three points measured on the inner circle of the standard part 300 using probe 1 are point g(X... 10 Y 10 ), point h(X)11 Y 11 ) and point k(X) 12 Y 12 ).

[0050] make:

[0051] S=(X 10 (Y 11 -Y 12 )+X 11 (Y 12 -Y 10 )+X 12 (Y 10 -Y 11 ))

[0052] Where S is not equal to 0, otherwise the three points are collinear.

[0053] M=(X 10 2 +Y 10 2 (Y) 11 -Y 12 )+(X 11 2 +Y 11 2 (Y) 12 -Y 10 )+(X 12 2 +Y 12 2 (Y) 10 -Y 11 )

[0054] N=(X 10 2 +Y 10 2 (X) 12 -X 11 )+(X 11 2 +Y 11 2 (X) 10 -X 12 )+(X 12 2 +Y 12 2 (X) 11 -X 10 )

[0055] The coordinates of the center O are:

[0056] X0=

[0057] Y0=

[0058] In step S1, the L1 value is obtained through the following steps: the standard part 300 is mounted on the headstock, and the straightness of the groove is checked by dial indicator to ensure that the angle of the blade groove 200 is correct. Alternatively, two points on one side of the groove wall of the blade groove 200 are measured by probe 1 and the offset angle θ is calculated by arctangent function to ensure that the angle of the blade groove 200 is correct. After the angle of the blade groove 200 is correct, the groove grinding spindle 8 is moved into the blade groove 200. The middle position of the groove grinding spindle 8 in the blade groove 200 is found by feeler gauge, and the X-axis coordinate L1 of the groove grinding spindle 8 when it is in the middle position of the blade groove 200 is calculated to provide a guarantee for the subsequent movement of the groove grinding spindle 8 to the middle position of the blank part 100.

[0059] In step S5, the L2 value is obtained through the following steps:

[0060] Move the blank 100 along the X-axis, and probe 1 measures the coordinates of point E (X). e Y e ) and the coordinates of point F (X f Y f );

[0061] Then L2 is calculated using the following formula:

[0062] L2= .

[0063] At this time, L2 is the X-axis coordinate of the midpoint C between points E and F, and the distance from the midpoint C to the main shaft 8 of the groove grinding mill is L2-L1.

[0064] In step S4, the process of rotating the blank 100 about its axis by θ to correct the machining angle of the blade groove 200 includes the following steps:

[0065] When X1 > X0, it means that points B and D are located on the right side of the blade slot 200. If X1 > X2, the blank 100 is rotated counterclockwise by θ around its axis to correct the angle of the blade slot 200. If X2 > X1, the blank 100 is rotated clockwise by arctan(θ / 2) around its axis. The angle of the blade groove 200 is corrected.

[0066] When X0 > X1, it means that points B and D are located on the left side of the blade slot 200. If X1 > X2, the blank 100 is rotated counterclockwise by θ around its axis to correct the angle of the blade slot 200. If X2 > X1, the blank 100 is rotated clockwise by arctan(θ / 2) around its axis. The angle of the blade groove 200 is corrected.

[0067] In step S5, machining the blade groove 200 of the blank 100 using the groove grinding spindle 8 according to the machining coordinates of the blade groove 200 includes the following steps:

[0068] Move the blank 100 along the Z-axis and rough grind the A-side groove wall of the blade groove 200 with the grinding wheel on the groove grinding spindle 8 according to the machining coordinates of the blade groove 200. After grinding, move the blank 100 along the X-axis and fine grind the A-side groove wall of the blade groove 200 with the grinding wheel on the groove grinding spindle 8 to complete the machining of the A-side groove wall of the blade groove 200.

[0069] Then, the blank 100 is moved along the X-axis, and the grinding wheel on the groove grinding spindle 8 is used to finely grind the other side of the groove wall of the blade groove 200, thus completing the machining of the blade groove 200.

[0070] In this structural design, the slot grinding spindle 8 first processes the A-side slot wall of the blade slot 200, and then processes the P-side slot wall of the blade slot 200. Segmented speed-changing machining is used when machining the A-side and P-side slot walls (the machining stroke can be divided into 20 segments, each with its own machining speed setting) to better ensure machining speed and accuracy.

[0071] In step S3, the insertion of the probe 1 into the blade groove 200 includes the following steps:

[0072] The blank 100 is moved along the X-axis and the probe 1 is moved along the Y-axis to initially align the probe 1 with the blade groove 200 of the blank 100. Then the blank 100 is moved along the Z-axis so that the probe 1 extends into the blade groove 200 of the blank 100.

[0073] In step S3, based on the coordinates of the center O, the blank 100 is moved along the X-axis and the probe 1 is moved along the Y-axis. The coordinates of points B and D are measured on the groove wall of the blade groove 200 by the probe 1.

[0074] As another embodiment of the present invention: in step S2, before the blank 100 is installed, the roundness of the inner circle of the blank 100 is ensured to be qualified by means of a fixture or manual calibration.

[0075] As another embodiment of the present invention: the first translation mechanism 3, the second translation mechanism 4 and the third moving mechanism 5 are all equipped with grating rulers, and the detection accuracy is ensured by setting grating rulers.

[0076] In another embodiment of the present invention, the first translation mechanism 3 includes a slide table 31, which slides along a first guide rail 32. The workpiece spindle 2 is mounted on the slide table 31, and a first driving mechanism is provided on the slide table 31. In this structural design, the first driving mechanism drives the slide table 31 to slide along the first guide rail 32, thereby causing the blank 100 to move along the X-axis.

[0077] In another embodiment of the present invention: the second translation mechanism 4 includes a saddle 41, a first guide rail 32 fixed above the saddle 41, the saddle 41 sliding along the second guide rail 42, a worktable 6 below the saddle 41, the second guide rail 42 mounted on the worktable 6, and a second drive mechanism 43 between the worktable 6 and the saddle 41. In this structural design, the second drive mechanism 43 drives the saddle 41 to slide along the second guide rail 42, thereby moving the blank 100 along the Z-axis.

[0078] In another embodiment of the present invention: the tailstock, the inner circle spindle 9 and the inner circle trimming spindle 10 are all fixed on the worktable 6. The tailstock and the headstock have the same coordinates on the Y-axis, and the inner circle spindle 9 has the same coordinates on the Y-axis as the headstock.

[0079] In another embodiment of the present invention: the workpiece spindle 2 is a spindle or rotary table 6. Before the blank 100 is processed, the blank 100 is rotated by the spindle or rotary table 6 to compensate for the angle of the blade groove 200.

[0080] Specifically, the blade groove 200 of the blank part 100 is a rectangular groove.

[0081] 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 for machining an inner groove of a workpiece with automatic positioning and precise calibration, characterized in that, The processing device includes a workpiece spindle, a tailstock, and a support. The workpiece spindle moves along the X-axis and Z-axis via a first translation mechanism and a second translation mechanism, respectively. The probe and the groove grinding spindle on the support both move along the Y-axis via a third translation mechanism. The processing device also includes the following steps: S1: After installing the standard part on the headstock of the workpiece spindle, measure and calculate the coordinates (X0, Y0) of the center point O of the standard part, the machining coordinates of the blade groove and the inner circle, and the X-axis coordinate L1 when the groove grinding spindle is in the middle position inside the blade groove of the standard part. S2: Manually install the blank on the headstock of the workpiece spindle. Move the headstock using the first translation mechanism to make the headstock and tailstock coaxial. Move the blank using the second translation mechanism. The tailstock extends into the inner circle of the blank. Then, when the headstock releases the blank, the tailstock clamps the blank. Finally, when the tailstock releases the blank, the headstock clamps the blank, so that the blank is coaxially set with the workpiece spindle. S3: Rotate the blank so that the blade groove is located on the lower side of the blank. Move the blank to the probe and insert the probe into the blade groove. Based on the coordinates of the center point O, measure the coordinates of point B (X1, Y1) and point D (X2, Y2) on one side of the blade groove wall. Points B and D are distributed vertically. Then, calculate the offset angle θ of the blank using the arctangent function. θ=arctan( ); S4: Rotate the blank about its axis by θ to correct the machining angle of the blade groove; S5: Measure the coordinates of points E and F of the blade groove using a probe. Points E and F are located on the two groove walls of the blade groove and are on the same horizontal plane. Calculate the X-axis coordinate L2 of the midpoint between points E and F. Move the blank along the X-axis by L2-L1. Use the groove grinding spindle to process the blade groove of the blank according to the blade groove processing coordinates. S6: Move the blank along the X-axis to make the inner circle spindle coaxial with the headstock, and then process the inner circle of the blank through the inner circle machining coordinates to obtain the standard part; S7: Repeat steps S2-S6 to process the next blank into a standard part.

2. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, In step S1, the coordinates of three points are measured on the inner circle of the standard part by the probe, and then the coordinates of the center O of the inner circle are calculated by the formula for determining the center of the circle by three points.

3. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, In step S1, the L1 value is obtained through the following steps: the standard part is mounted on the headstock, the middle position of the groove grinding spindle in the blade groove is found by the feeler gauge, and the X-axis coordinate of the groove grinding spindle when it is in the middle position of the blade groove is calculated.

4. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, In step S5, the L2 value is obtained through the following steps: Move the blank along the X-axis and measure the coordinates of point E (X). e Y e ) and the coordinates of point F (X f Y f ); Then L2 is calculated using the following formula: L2= 。 5. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, In step S5, machining the blade groove of the blank using the groove grinding spindle according to the blade groove machining coordinates includes the following steps: Move the blank along the Z-axis, and according to the blade groove machining coordinates, use the grinding wheel on the groove grinding spindle to rough grind the A-side groove wall of the blade groove. After grinding, move the blank along the X-axis, and use the grinding wheel on the groove grinding spindle to finish grinding the A-side groove wall of the blade groove, thus completing the machining of the A-side groove wall of the blade groove. Then, the blank is moved along the X-axis, and the grinding wheel on the groove grinding spindle is used to finely grind the other side of the blade groove wall to complete the machining of the blade groove.

6. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, In step S3, the probe extending into the blade groove includes the following steps: Move the blank along the X-axis and the probe along the Y-axis to initially align the probe with the blade groove of the blank. Move the blank along the Z-axis to insert the probe into the blade groove of the blank.

7. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, In step S3, based on the coordinates of the center O, the blank is moved along the X-axis and the probe is moved along the Y-axis to measure the coordinates of points B and D on the groove wall of the blade groove.

8. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, In step S4, rotating the blank about its axis by θ to correct the machining angle of the blade groove includes the following steps: If X1 > X2, then the blank is rotated counterclockwise by θ around its axis to correct the angle of the blade slot. If X2 > X1, then rotate the blank around its axis clockwise by arctan( The angle of the blade groove is corrected.

9. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 1, characterized in that, The first translation mechanism, the second translation mechanism and the third movement mechanism are all equipped with grating rulers.

10. The method for machining an inner groove for automatic positioning and precise calibration of a workpiece according to claim 9, characterized in that, The first translation mechanism includes a slide table that slides along a first guide rail, the workpiece spindle is mounted on the slide table, and a first drive mechanism is provided on the slide table.

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