Forming, grinding and tool setting method for turbine disc mortises

Abstract

The invention discloses a tool setting method for forming grinding machining of a turbine disc mortise. The method comprises the following steps: 1, constructing a pressure-displacement relation curve between turbine disc mortises on a formed grinding wheel; and secondly, the turbine disc is clamped, and the formed grinding wheel extends into the machined turbine disc mortise. And thirdly, tool setting is conducted between the mortise and the formed grinding wheel. A force sensor is adopted to judge whether a formed grinding wheel is in contact with a turbine disc mortise or not; and the relation between the extrusion force and the workpiece deformation amount is obtained based on finite element simulation, so that the detection result of the force sensor controls the back-off amount of the formed grinding wheel, and the positioning error caused by extrusion deformation is reduced. According to the method, the position of the formed grinding wheel is closer to the state of being aligned with the mortise in the mode that the grinding wheel is transversely moved to make contact, then vertically moved to make contact and then retreated upwards; by repeatedly executing the process, the direct matching degree of the grinding wheel and the mortise can be effectively improved, and rapid and accurate tool setting is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of grinding machining, and particularly relates to a tool setting method for form grinding of a turbine disk dovetail groove. Background Art

[0002] The turbine disk is an important rotating component at the hot end of an aeroengine. The dovetail groove is a key part for connecting the turbine disk and the blade. The structure and shape of this part are complex, and high requirements are imposed on manufacturing precision and surface integrity. Traditional broaching machining is difficult to meet the requirements for dovetail groove machining, so form grinding machining is adopted. Form grinding machining is a precision machining method used to manufacture components with complex shapes and high-precision requirements. Different from traditional surface grinding or cylindrical grinding, form grinding machining directly forms the required complex geometric shape on the workpiece surface by using a specially designed profiled grinding wheel. It can achieve relatively complex curved surface machining and can reach high surface precision and surface finish.

[0003] In the grinding machining of turbine disk dovetail grooves, in the traditional tool setting, the surface of the grinding wheel is scanned by an instrument to record its shape and size, and then adjusted and calibrated according to the scanned data to complete the tool setting. However, due to the complexity of the grinding wheel surface and the limitations of instrument precision, it is difficult to achieve efficient and precise tool setting. Secondly, the clamping stability of the turbine disk dovetail groove is insufficient, and in the traditional cooling method, it is difficult for the grinding fluid to enter the tool-workpiece contact area during dovetail groove grinding, resulting in the surface roughness and profile accuracy of the workpiece after machining being difficult to meet the expected requirements. Therefore, it is necessary to consider the optimal tool setting pose method of the grinding wheel and the cooling clamping device to achieve precision grinding machining of the turbine disk dovetail groove. Summary of the Invention

[0004] The present invention conducts research on the problem of low surface precision in the actual form grinding process of an arc surface, and proposes a tool setting method for form grinding of a turbine disk dovetail groove, which is a detection method that can detect the matching condition between the arc surface of a profiled grinding wheel and the arc surface of a turbine disk dovetail groove workpiece; it is a method based on a three-axis force sensor that continuously adjusts through sensor force data to achieve preliminary contour matching; it is a method based on the arc surface topography of the profiled grinding wheel to obtain the optimal tool setting contour of the grinding wheel and correct the tool setting pose of the grinding wheel according to the actual contour of the grinding wheel, reducing the inaccuracy of the tool setting pose caused by some protruding abrasive grains; it is a method that combines the actual contacting abrasive grains and the surface, obtains the force-displacement curve through ABAQUS simulation, and corrects the tool setting pose to reduce the inaccuracy of the tool setting pose caused by the abrasive grains pressing into the surface during tool setting.

[0005] The present invention provides a tool setting method for form grinding of a turbine disk dovetail groove, which is characterized by including the following steps: Step 1: Construct a pressure-displacement relationship curve between the turbine disk dovetail groove on the form grinding wheel.

[0006] Step 2. Clamp the turbine disk and insert the formed grinding wheel into the mortise groove of the turbine disk to be machined.

[0007] Step 3. Perform tool setting between the mortise groove and the formed grinding wheel.

[0008] Step 3-1. The formed grinding wheel approaches the side wall of the mortise groove in the horizontal direction, and continuously detect the pressure on the formed grinding wheel; when the pressure on the formed grinding wheel reaches the pressure threshold, the formed grinding wheel stops moving, and record the pressure value F1 between the formed grinding wheel and the mortise groove of the turbine disk.

[0009] Step 3-2. According to the pressure-displacement relationship curve obtained in Step 1 and the pressure value F1, obtain the actual displacement S1 of the abrasive grains pressing into the surface of the mortise groove; the formed grinding wheel 3 retracts horizontally by the displacement S1, and record the vertical coordinate Z0 of the formed grinding wheel 3 at this time.

[0010] Step 3-3. The formed grinding wheel moves downward in the vertical direction, and continuously detect the pressure on the formed grinding wheel; when the pressure on the formed grinding wheel reaches the pressure threshold, the formed grinding wheel stops moving, and record the pressure value F2 between the formed grinding wheel and the mortise groove of the turbine disk.

[0011] Step 3-4. According to the pressure-displacement relationship curve obtained in Step 1 and the pressure value F2, obtain the actual displacement S2 of the abrasive grains pressing into the surface of the mortise groove; the spindle drives the formed grinding wheel to retract vertically by the displacement S2, and record the vertical coordinate Z1 of the formed grinding wheel 3 at this time.

[0012] Step 3-5. Determine the target realignment amount according to the vertical coordinate Z0 and the vertical coordinate Z1. . The formed grinding wheel moves upward by the target realignment amount .

[0013] Step 3-6. Repeat Steps 3-1 to 3-5 until the calculated displacement is less than or equal to the profile accuracy threshold.

[0014] Preferably, the process of Step 1 is as follows: construct the geometric models of the mortise groove block and a single abrasive grain; perform finite element simulation on the obtained mortise groove block model and abrasive grain model. The abrasive grain model is set as a rigid body; the material properties of the mortise groove block model are set according to the material of the turbine disk to be machined. During the simulation, the abrasive grain model moves towards the mortise groove block model at a preset speed, and solve the relationship between the pressure of the formed grinding wheel on the mortise groove of the turbine disk and the deformation amount of the surface of the mortise groove of the turbine disk.

[0015] Preferably, the mortise groove block model is given a J-C constitutive damage model and thermophysical properties. Mesh refinement is performed on the area of the machined surface of the mortise groove block model at an equal distance of 0.025 mm in the depth direction; mesh refinement is performed on the abrasive grain model.

[0016] Preferably, the initial distance between the abrasive grain model and the tenon groove block model is set to 0.02 mm.

[0017] Preferably, the value of the pressure threshold is 5 N to 10 N.

[0018] Preferably, in step 3-5, the target return amount is obtained through the following process; When step 3-5 is executed for the first time, the displacement has the following expression: where, is the angle between the upper hypotenuse of the tenon groove and the horizontal plane; is the angle between the lower hypotenuse of the tenon groove and the horizontal direction.

[0019] Except for the first execution of step 3-5, the displacement has the following expression: Preferably, after step three is executed, the matrix contour of the formed grinding wheel is compared with the sampled point fitting contour at the reference line to obtain the average horizontal offset and the average vertical offset between the matrix contour and the sampled point fitting contour; then, the formed grinding wheel is moved based on the obtained average horizontal offset and average vertical offset.

[0020] The process of obtaining the sampled point fitting contour at the reference line of the formed grinding wheel is as follows: Determine a reference line on the formed grinding wheel. The width of the reference line is less than the abrasive grain size. Detect the coordinates of multiple points on the reference line through a three-coordinate measuring instrument, and fit to obtain a contour arc formed by fitting the highest points on the surface of the formed grinding wheel to form an arc, which is used as the sampled point fitting contour.

[0021] Preferably, the grinding equipment used in this formed grinding machining tool setting method includes a machine tool bed, a turbine disk mounting assembly, and a grinding assembly. The turbine disk mounting assembly includes a three-way force measuring device and an internal hole hydraulic fixture. The internal hole hydraulic fixture is installed on the three-way force measuring device; the internal hole hydraulic fixture is used to clamp the turbine disk. The pressure value F1 measured in step 3-1 and the pressure value F2 measured in step 3-3 are both measured through the three-way force measuring device.

[0022] Preferably, the turbine disk mounting assembly further includes a first rotating frame, a first rotary driving mechanism, a second rotating frame, and a second rotary driving mechanism. The first rotating frame and the machine tool bed form a first rotating pair that rotates about a horizontal axis. The second rotating frame and the first rotating frame form a second rotating pair. The rotation axis of the first rotating pair and the rotation axis of the second rotating pair are perpendicular to each other. The first rotating frame is driven to rotate by a motor in the first rotary driving mechanism. The second rotating frame is driven to rotate by a motor in the second rotary driving mechanism. The three-way force measuring device is mounted on the second rotating frame; Preferably, the grinding assembly includes a tool spindle, a tool clamping device, and a formed grinding wheel. The tool spindle can move and rotate about its own axis; the tool clamping device is mounted at the bottom of the tool spindle. The formed grinding wheel is fixedly clamped at the bottom of the tool clamping device. The longitudinal cross-sectional profile of the formed grinding wheel matches the profile of the dovetail groove of the turbine disk.

[0023] Preferably, the grinding equipment further includes an illumination assembly. The illumination device is mounted on the first rotating frame and is used to illuminate the area to be ground.

[0024] The beneficial effects of the present invention are as follows: The present invention uses a force sensor to determine whether the formed grinding wheel contacts the dovetail groove of the turbine disk; and based on finite element simulation, the relationship between the extrusion force and the workpiece deformation amount is obtained, so as to control the retraction amount of the formed grinding wheel according to the detection result of the force sensor, reduce the positioning error caused by extrusion deformation, improve the tool alignment accuracy between the grinding wheel and the dovetail groove workpiece, and is beneficial to improving the final surface quality.

[0025] The present invention makes the position of the formed grinding wheel closer to the state aligned with the dovetail groove by first moving horizontally to contact, then moving vertically to contact, and then retracting upward; by repeating this process, the matching degree between the grinding wheel and the dovetail groove can be effectively improved, and rapid and accurate tool alignment can be achieved.

[0026] The present invention compares the fitting profile of the abrasive grains on the grinding wheel with the profile of the grinding wheel base, further corrects the position of the grinding wheel, thereby reducing the tool alignment deviation of the grinding wheel caused by some protruding abrasive grains, further improving the tool alignment accuracy, and improving the final profile accuracy of the dovetail groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional schematic diagram of the grinding equipment used in the present invention; Figure 2 is a top view schematic diagram of the turbine disk mounting assembly in the grinding equipment used in the present invention; Figure 3 is a simulation diagram in Step 1 of the present invention; Figure 4 is a pressure-displacement relationship curve graph obtained in Step 1 of the present invention; Figure 5 It is a schematic diagram of the process of Step 3 of the present invention; Figure 6 It is a schematic diagram of the angles between the upper and lower inclined edges of the mortise groove and the horizontal plane in Step 3 of the present invention; Figure 7 It is a partial schematic diagram of the relative position between the matrix contour and the point-sampled fitting contour in Step 4 of the present invention.

[0028] Reference numerals: 1 - tool spindle, 2 - tool clamping device, 3 - forming grinding wheel, 4 - turbine disk, 5 - internal hole hydraulic fixture, 6 - three-way force measuring device, 7 - second rotating frame, 8 - first rotating frame, 9 - machine tool bed. Detailed implementation manners

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] As Figure 1 and Figure 2 shown, a method for tool setting in the profile grinding of a turbine disk mortise groove uses grinding equipment including a machine tool bed 9, a turbine disk mounting assembly, a grinding assembly, and a lighting assembly. The turbine disk mounting assembly includes a first rotating frame 8, a first rotary drive mechanism (not shown in the figure), a second rotating frame 7, a second rotary drive mechanism (not shown in the figure), a three-way force measuring device 6, and an internal hole hydraulic fixture 5. The first rotating frame 8 and the machine tool bed 9 form a first rotating pair that rotates around a horizontal axis. The second rotating frame 7 and the first rotating frame 8 form a second rotating pair. The rotation axis of the first rotating pair is perpendicular to the rotation axis of the second rotating pair. The first rotating frame 8 is driven to rotate by a motor in the first rotary drive mechanism. The second rotating frame 7 is driven to rotate by a motor in the second rotary drive mechanism.

[0031] The internal hole hydraulic fixture 5 is installed on the second rotating frame 7 through the three-way force measuring device 6; the internal hole hydraulic fixture 5 is used to clamp the turbine disk 4.

[0032] The grinding assembly includes a tool spindle 1, a tool clamping device 2, and a forming grinding wheel 3. The tool spindle 1 can rotate around its own axis and translate in three degrees of freedom under the drive of a power element; the tool clamping device 2 is installed at the bottom end of the tool spindle 1. The forming grinding wheel 3 is clamped and fixed at the bottom of the tool clamping device 2. The longitudinal section profile of the forming grinding wheel 3 matches the mortise groove profile of the turbine disk 4.

[0033] The lighting device is installed on the first rotating frame 8 and is used to illuminate the area to be ground. The lighting device includes a lighting lamp and an adjustable magnet.

[0034] The method for tool setting in the profile grinding of the turbine disk mortise groove includes the following steps: Step 1: Simulate the abrasive grains of the formed grinding wheel 3 and the workpiece to obtain the pressure-displacement (i.e., deformation amount) relationship curve between the abrasive grains and the turbine disk dovetail groove. The specific simulation process is as follows: As Figure 3 shown, construct the geometric models of the dovetail groove block and a single abrasive grain; the arc surface on the dovetail groove block model matches the shape of the turbine disk dovetail groove. Import the dovetail groove block model and the single abrasive grain model into the ABAQUS software; assign the material properties of the abrasive grains and the turbine disk to the dovetail groove block model and the single abrasive grain model respectively; set the abrasive grain model as a rigid body and only assign basic material parameters; assign the J-C constitutive damage model and thermophysical properties to the dovetail groove block model. Refine the mesh of the area at an equal distance of 0.025 mm in the depth direction of the machined surface of the dovetail groove block model; refine the mesh of the abrasive grain model.

[0035] During assembly, according to the actual contact area, the distance between the abrasive grain model and the dovetail groove block model is 0.02 mm. Set the temperature-displacement coupling analysis step with a mass scaling of 200. Set the time to 0.5 s. Set a point on the surface of the abrasive grain and set it as the rigid body coupling point of the abrasive grain model, and couple the abrasive grain to the rigid body coupling point.

[0036] Establish general contact, and set the contact between the surface of the abrasive grain model and the dovetail groove block model, the contact between the surface of the abrasive grain model and all surfaces of the grids of the dovetail groove block model, and the self-contact of all surfaces of the grids of the dovetail groove block model. Completely fix the side of the dovetail groove block model facing away from the machined surface, and set the speed of the rigid body coupling point of the abrasive grain model moving towards the workpiece to 6 mm / min. Submit the solution analysis of this model to obtain the pressure-displacement relationship curve between the abrasive grains and the turbine disk dovetail groove. If the result does not converge, the abrasive grain model can be simplified or the mesh division operation can be performed again. The obtained pressure-displacement relationship curve is as Figure 4 shown, Step 2: As Figure 5 shown, clamp the turbine disk with the basic dovetail groove shape formed by wire cutting processing on the internal hole hydraulic fixture 5. The specific process is as follows: 2-1. Make a preliminary adjustment to the first rotating frame 8 and the second rotating frame 7 that hold the turbine disk. Clamp the turbine disk tenon groove on the fixture, then debug and zero the data in the three-way force measuring device 6. Push the turbine disk with an external force sensor and observe whether the data in the external force sensor is consistent with that in the three-way force measuring device 6. If they are consistent, proceed to the next step; if not, make adjustments until they are consistent. Adjust the position of the first rotating frame 8. Select a plane on the turbine disk, use a suitable metal binder to stick a metal block on the plane, move the grinding wheel to the side of the metal block, and make the distance almost zero by judging through the force sensor. Move up and down on the plane to determine the position of the first rotating frame 8. Adjust the position of the second rotating frame 7. Align the central axis of the grinding wheel rotation with the central axis of the tenon groove to determine the position of the second rotating frame 7. The metal block has two opposite sides with a parallelism less than the threshold value.

[0037] 2-2. Use the lighting device to irradiate the machined tenon groove on the turbine disk 4; use a laser line light source to irradiate a laser marking line on the tool setting area of the forming grinding wheel 3; rotate the forming grinding wheel 3 so that the reference line on the forming grinding wheel 3 coincides with the laser marking line. Move the forming grinding wheel to the machined tenon groove of the turbine disk 4 first quickly and then slowly by adjusting the moving speed of the main shaft 1, and make their contours as close as possible, leaving a part of the gap.

[0038] Step 3: Perform precise tool setting between the tenon groove and the grinding wheel.

[0039] 3-1. Move in the horizontal direction of the tenon groove (specifically the Y direction in Figure 2 ) at the slowest moving speed of the main shaft. As shown in Figure 2 , observe the numerical change of the three-way force measuring device 6 during the movement. When the pressure measured by the three-way force measuring device 6 reaches the pressure threshold value, the forming grinding wheel 3 stops moving in the horizontal direction; when the pressure value measured by the three-way force measuring device 6 is stable, record the resultant force F1 measured by the three-way force measuring device 6 at this time; the value of the pressure threshold is 5N - 10N. The resultant force F1 measured by the three-way force measuring device 6 is the resultant force change value at the current moment relative to the initial moment, which is used to eliminate the gravity influence of the turbine disk 4 and the inner hole hydraulic fixture 5.

[0040] 3-2. According to the pressure-displacement relationship curve obtained in Step 1 and the resultant force F1 measured by the three-way force measuring device 6, obtain the actual displacement amount S1 of the abrasive grains of the current forming grinding wheel 3 pressing into the tenon groove surface; the main shaft drives the forming grinding wheel 3 to retract the displacement amount S1 in the horizontal direction, and record the coordinates (X0, Y0, Z0) of the forming grinding wheel 3 at this time; 3-3. Move the grinding wheel downward in the vertical direction at the slowest moving speed of the main shaft. Observe the numerical changes of the three-direction force measuring device 6 during the movement. When the pressure measured by the three-direction force measuring device 6 reaches the pressure threshold, the forming grinding wheel 3 stops moving in the vertical direction; when the pressure value measured by the three-direction force measuring device 6 is stable, record the resultant force F2 measured by the three-direction force measuring device 6 at this time; 3-4. According to the pressure-displacement relationship curve obtained in step one and the resultant force F2 measured by the three-direction force measuring device 6, obtain the actual displacement amount S2 of the abrasive grains of the current forming grinding wheel 3 pressing into the surface of the mortise groove; the main shaft drives the forming grinding wheel 3 to retract the displacement amount S2 in the vertical direction, and record the coordinates (X1, Y1, Z1) of the forming grinding wheel 3 at this time; 3-5. Calculate the displacement amount that the forming grinding wheel 3 needs to move upward ; and drive the forming grinding wheel 3 to move upward by the displacement amount .

[0041] When performing step 3-5 for the first time, the expression of the displacement amount is as follows: As Figure 6 shown, is the angle between the upper hypotenuse of the mortise groove and the horizontal plane; is the angle between the lower hypotenuse of the mortise groove and the horizontal direction.

[0042] When performing step 3-5 for the second time and subsequent times, the expression of the displacement amount is as follows: 3-6. Repeat steps 3-1 to 3-5 until the calculated displacement amount is less than or equal to the profile accuracy threshold, and the tool setting is completed. In this embodiment, the value of the profile accuracy threshold is 0.002 mm.

[0043] Step Four: Correct the profile error of the forming grinding wheel 3.

[0044] As Figure 7 shown, compare the base profile of the forming grinding wheel 3 with the sampled point fitting profile at the reference line to obtain the average horizontal offset and average vertical offset between the base profile and the sampled point fitting profile; then, move the forming grinding wheel 3 according to the obtained average horizontal offset and average vertical offset to complete the final tool setting between the turbine disk mortise groove and the grinding wheel. The base profile of the forming grinding wheel 3 is the designed profile of the forming grinding wheel 3, which matches the profile of the turbine disk mortise groove.

[0045] The process of obtaining the sampled point fitting profile at the reference line of the forming grinding wheel 3 is as follows: Determine a reference line on the formed grinding wheel 3. The width of the reference line is smaller than the particle size of the abrasive grains. In this embodiment, it is taken as 0.02 mm. Detect the coordinates of multiple points on the reference line through a coordinate measuring machine, and fit to obtain a contour arc formed by fitting the highest points on the surface of the formed grinding wheel 3 to form an arc, which is used as the sampling and fitting contour. Due to the reason that some abrasive grains on the formed grinding wheel 3 are relatively prominent, there is a deviation between the sampling and fitting contour and the actual substrate contour of the formed grinding wheel 3, so correction is required.

[0046] Step Five: After tool setting is completed, process the turbine disk tenon groove. The processing of a single tenon groove is divided into three parts, namely the left and right parts of the tenon groove and the bottom arc part of the tenon groove. First, process the bottom arc part of the tenon groove. The tool setting method is as shown above. After processing one bottom arc, rotate by an angle according to the number of tenon grooves; when processing the left and right parts of the tenon groove, do not rotate the turbine disk after processing the left groove, and move 2 mm to process the right groove. After processing the left and right grooves, rotate the turbine disk to process the next groove until all tenon grooves are processed.

Claims

1. A tool setting method for form grinding of a turbine disk dovetail groove, characterized in that: It includes the following steps: Step 1: Construct the pressure-displacement relationship curve between the turbine disk tenon grooves on the formed grinding wheel; Step 2: Clamp the turbine disk and insert the formed grinding wheel into the machined turbine disk tenon groove; Step 3: Perform tool setting between the tenon groove and the formed grinding wheel; Step 3-1. The formed grinding wheel approaches the side wall of the tenon groove in the horizontal direction, and continuously detects the pressure received by the formed grinding wheel; when the pressure received by the formed grinding wheel reaches the pressure threshold, the formed grinding wheel stops moving, and record the pressure value F1 between the formed grinding wheel and the turbine disk tenon groove; Step 3-2. According to the pressure-displacement relationship curve obtained in Step 1 and the pressure value F1, obtain the actual displacement amount S1 of the abrasive grains pressed into the surface of the tenon groove; the formed grinding wheel 3 retracts horizontally by the displacement amount S1, and record the vertical coordinate Z0 of the formed grinding wheel 3 at this time; Step 3-3. The formed grinding wheel moves downward in the vertical direction, and continuously detects the pressure received by the formed grinding wheel; when the pressure received by the formed grinding wheel reaches the pressure threshold, the formed grinding wheel stops moving, and record the pressure value F2 between the formed grinding wheel and the turbine disk tenon groove; Step 3-4. According to the pressure-displacement relationship curve obtained in Step 1 and the pressure value F2, obtain the actual displacement amount S2 of the abrasive grains pressed into the surface of the tenon groove; the spindle drives the formed grinding wheel to retract vertically by the displacement amount S2, and record the vertical coordinate Z1 of the formed grinding wheel 3 at this time; Step 3-5. Determine the target alignment amount according to the vertical coordinate Z0 and the vertical coordinate Z1 ; Forming grinding wheel upward movement target return amount ; Step 3-6. Repeat Steps 3-1 to 3-5 until the calculated displacement is less than or equal to the surface accuracy threshold.

2. The tool setting method for form grinding of the dovetail groove of a turbine disk according to claim 1, characterized in that: The process of Step 1 is as follows: Construct the geometric models of the tenon groove block and a single abrasive grain; perform finite element simulation on the obtained tenon groove block model and abrasive grain model; the abrasive grain model is set as a rigid body; the material properties of the tenon groove block model are set according to the material of the machined turbine disk; during the simulation process, the abrasive grain model moves towards the tenon groove block model at a preset speed, and solve the relationship between the pressure of the formed grinding wheel on the turbine disk tenon groove and the deformation amount of the turbine disk tenon groove surface.

3. A tool setting method for profile grinding of a turbine disk dovetail groove according to claim 1, characterized in that: The tenon groove block model is given the J-C constitutive damage model and thermophysical properties; the area of the machined surface of the tenon groove block model with an equal distance of 0.025 mm in the depth direction is refined and meshed; the abrasive grain model is refined and meshed.

4. A tool setting method for profile grinding of a turbine disk dovetail groove according to claim 1, characterized in that: The value of the pressure threshold is 5 N to 10 N.

5. A tool setting method for profile grinding of a turbine disk dovetail groove according to claim 1, characterized in that: In step 3-5, the target straightening amount is obtained through the following process; When step 3-5 is executed for the first time, the displacement has the following expression: ； Wherein, is the included angle between the upper hypotenuse of the mortise groove and the horizontal plane; is the included angle between the lower hypotenuse of the mortise groove and the horizontal direction; Except for the first execution of steps 3-5, the expression of the displacement is as follows: 。 6. A tool setting method for profile grinding of a turbine disk dovetail groove according to claim 1, characterized in that: After Step 3 is executed, compare the matrix contour of the formed grinding wheel with the sampled fitting contour at the reference line to obtain the average horizontal offset and average vertical offset between the matrix contour and the sampled fitting contour; then, move the formed grinding wheel according to the obtained average horizontal offset and average vertical offset; The process of obtaining the sampled fitting contour at the reference line of the formed grinding wheel is as follows: Determine a reference line on the formed grinding wheel; the width of the reference line is less than the abrasive grain particle size; detect the coordinates of multiple points on the reference line through a three-coordinate measuring instrument, and fit to obtain a contour arc formed by fitting the highest points on the surface of the formed grinding wheel to form an arc, which is used as the sampled fitting contour.

7. A tool setting method for profile grinding of a turbine disk dovetail groove according to claim 1, characterized in that: The grinding equipment used includes a machine tool bed (9), a turbine disk mounting assembly, and a grinding assembly; the turbine disk mounting assembly includes a three-way force measuring device (6) and an internal hole hydraulic fixture (5); the internal hole hydraulic fixture (5) is installed on the three-way force measuring device (6); the internal hole hydraulic fixture (5) is used for clamping the turbine disk (4); the pressure value F1 measured in step 3-1 and the pressure value F2 measured in step 3-3 are both measured by the three-way force measuring device (6).

8. A tool setting method for form grinding of a turbine disk dovetail groove according to claim 7, characterized in that: The turbine disk mounting assembly further includes a first rotating frame (8), a first rotation driving mechanism, a second rotating frame (7), and a second rotation driving mechanism; the first rotating frame (8) and the machine tool bed (9) form a first rotating pair that rotates around a horizontal axis; the second rotating frame (7) and the first rotating frame (8) form a second rotating pair; the rotation axis of the first rotating pair is perpendicular to the rotation axis of the second rotating pair; the first rotating frame (8) is driven to rotate by a motor in the first rotation driving mechanism; the second rotating frame (7) is driven to rotate by a motor in the second rotation driving mechanism; the three-way force measuring device (6) is installed on the second rotating frame (7).

9. A tool setting method for form grinding of a dovetail groove on a turbine disk, characterized in that: The grinding assembly includes a tool spindle (1), a tool clamping device (2), and a formed grinding wheel (3); the tool spindle (1) can move and rotate around its own axis; the tool clamping device (2) is installed at the bottom of the tool spindle (1); the formed grinding wheel (3) is clamped and fixed at the bottom of the tool clamping device (2); the longitudinal section profile of the formed grinding wheel (3) matches the tenon groove profile of the turbine disk (4).

10. A tool setting method for form grinding of a turbine disk dovetail groove according to claim 7, characterized in that: The grinding equipment further includes a lighting assembly; the lighting device is installed on the first rotating frame (8) and is used for illuminating the area to be ground.

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