Internal grinding arm device special for grinding deep hole internal spline and machining method

Abstract

The invention belongs to the technical field of internal spline grinding machining, and discloses a special internal grinding arm device for deep hole internal spline grinding, which comprises a grinding carriage and a grinding head which are fixed on the surface of a machine tool turntable, the grinding wheel frame comprises a cover plate and a frame body, a transmission mechanism and a grinding head are connected into the frame body, and the overall structure of the grinding wheel frame is arranged to be a trapezoidal structure with a large section on the side close to the transmission mechanism and a small section on the side close to the grinding head. According to the internal grinding arm special for grinding the deep hole internal spline, the structural rigidity and the vibration resistance of the grinding device in the deep hole internal spline machining process are effectively improved through the trapezoidal structural design, the problems of grinding wheel jumping and vibration caused by cantilever deflection are remarkably solved, and therefore the stability and the machining precision in the grinding process are improved. Compared with a traditional inner grinding arm structure, the structure has the good mass distribution characteristic while enough rigidity is guaranteed, the system rigidity can be kept in the length-diameter-ratio workpiece grinding process, structural deformation is restrained, and the workpiece surface integrity is improved.

Description

Technical Field

[0001] This invention relates to the field of internal spline grinding technology, specifically to a special internal grinding arm device and processing method for deep hole internal spline grinding. Background Technology

[0002] Deep-hole internal splines are widely used in aerospace, high-end equipment manufacturing, and automotive transmission systems, serving as a key component for achieving high torque density, compact structure, and lightweight transmission. Their role in power transmission systems is crucial, directly impacting the overall efficiency, size, and response performance. Due to their typically small diameter, large depth, and complex tooth profiles, deep-hole internal splines place extremely high demands on machining accuracy and process stability. Their machining quality directly affects the geometric accuracy and operational reliability of the entire assembly. Even minor deviations during machining can easily lead to problems such as tooth profile errors, tooth direction fluctuations, and poor coaxiality, resulting in poor transmission meshing, assembly interference, and even premature failure. Therefore, ensuring high-precision and highly consistent machining of deep-hole internal splines is a fundamental prerequisite for guaranteeing the reliable operation of high-end equipment.

[0003] Currently, the deep hole internal spline grinding process faces the following challenges: In the machining of deep hole internal splines with a large length-to-diameter ratio, traditional internal grinding arm structures generally suffer from insufficient structural rigidity. When the internal grinding arm extends too far, significant structural deflection occurs due to the cantilever characteristics and grinding wheel load, leading to grinding wheel runout and high-frequency chatter. This vibration not only reduces machining accuracy but also affects the surface integrity of the workpiece and grinding stability.

[0004] Therefore, a new structural form with high rigidity, strong vibration resistance and moderate mass is needed to improve the overall performance of the deep hole internal spline grinding system. Summary of the Invention

[0005] The purpose of this invention is to provide a dedicated internal grinding arm device for deep hole internal spline grinding. This device optimizes the overall structure of the grinding wheel holder to enable it to perform grinding of internal splines with large length-to-diameter ratios. The overall structure of the grinding wheel holder is configured as a trapezoidal structure with a larger cross-section near the transmission mechanism and a smaller cross-section near the grinding head, forming a trapezoidal structure that is wider at the front and narrower at the back. This improves the stiffness of the stressed end and reduces vibration displacement at the free end, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A special internal grinding arm device for grinding deep hole internal splines includes a grinding wheel frame and a grinding head fixed to the surface of a machine tool rotary table; The grinding wheel frame includes a cover plate and a frame body. The frame body is internally connected to a transmission mechanism and a grinding head. The overall structure of the grinding wheel frame is a trapezoidal structure with a larger cross-section on the side closer to the transmission mechanism and a smaller cross-section on the side closer to the grinding head. The transmission mechanism includes a drive motor with a drive shaft passing through the bottom of the frame, and the drive end of the drive motor is connected to the grinding head through a synchronous pulley and a synchronous belt; The grinding head includes a grinding wheel spindle connected between the cover plate and the frame. A timing pulley connected to a timing belt is sleeved on the outside of the grinding wheel spindle. A grinding wheel is also fixedly connected to the outside of the grinding wheel spindle by a fastening mechanism.

[0007] More preferably, the frame and the cover plate are symmetrically provided with second reserved holes, and a first bearing and a second bearing are respectively embedded in the two second reserved holes. A grinding wheel spindle is rotatably connected between the first bearing and the second bearing. A first end cover and a second end cover are respectively provided at the ends of the first bearing and the second bearing that are far apart from each other, and the first end cover and the second end cover are respectively fixedly connected to the frame and the cover plate.

[0008] More preferably, a connecting key is provided along the axial direction at the connection between the surface of the grinding wheel spindle and the timing pulley, and a keyway that cooperates with the connecting key is provided inside the timing pulley. A second fastening screw is connected through the other end of the timing pulley at a position symmetrical to the keyway, and the end of the second fastening screw is connected to the surface of the grinding wheel spindle.

[0009] More preferably, the fastening mechanism includes an expansion sleeve connected to the surface of the grinding wheel spindle. The expansion sleeve is fitted with a grinding wheel, a first grinding wheel flange, and a second grinding wheel flange. The first and second grinding wheel flanges are symmetrically arranged on both sides of the grinding wheel. The expansion sleeve has a plurality of tapered holes evenly arranged along the axial direction inside, and each tapered hole is connected to a fixing bolt. A retaining ring is also provided at the end of the fixing bolt away from the expansion sleeve. The retaining ring is fitted onto the shoulder of the grinding wheel spindle surface.

[0010] More preferably, a first reserved hole is provided at the other end of the frame surface, and a drive shaft of the drive end of the drive motor is provided through the first reserved hole. The drive motor is fixedly connected to the frame surface by connecting bolts and multiple connecting holes in the outer circumferential direction of the first reserved hole.

[0011] More preferably, the drive shaft surface of the drive end of the drive motor is provided with a flat key along the axial direction, the synchronous pulley is provided with a keyway that cooperates with the flat key, and a first fastening screw is connected through the other end of the synchronous pulley at a position symmetrical to the keyway, the end of the first fastening screw is connected to the surface of the drive shaft.

[0012] More preferably, the frame body has multiple threaded holes on its surface near the cover plate, and the cover plate has positioning holes corresponding to the threaded holes. The frame body and the cover plate are fixedly connected by multiple positioning bolts that engage with the positioning holes and threaded holes. A baffle is also provided at the end of the frame body near the grinding head, dividing the grinding wheel holder into an open structure and a closed structure. The end near the grinding head is an open structure, allowing for quick removal of the cover plate to replace the grinding wheel when it wears out. The end near the transmission mechanism is a closed structure, preventing grinding debris generated during processing from entering the transmission mechanism.

[0013] The present invention also provides a technical solution: a processing method for a special internal grinding arm device for deep hole internal spline grinding, comprising the following steps: S1. Pre-processing: Based on the structure of the deep hole spline, the machining parameters are calculated and adjusted by the machine tool software; S2. Place the machined deep hole spline in the workpiece clamping device of the machine tool and fix it. S3. Start the machine tool, set the machine tool probe as the origin coordinate, and drive the probe to move along the xyz directions through the machine tool slide rail, so that the probe extends into the interior of the deep hole spline blank, and determine the coordinates of the central axis of the internal spline through the probe; S4. Set the grinding wheel center as the origin coordinate, align the grinding wheel center with the internal spline axis according to the probe movement trajectory in step S3, and set the offset according to the internal spline tooth profile machining parameters obtained in step S1. S5. Start the drive motor, the grinding wheel slowly feeds and grinds the internal spline until the tooth profile is completely machined, the center of the grinding wheel moves back to the central axis of the internal spline and exits the internal spline blank. S6. After the machine tool turntable rotates a certain angle according to the machining parameters of S1, repeat steps S4-S5. After all the tooth profiles have been machined, turn off the drive motor switch, reset the internal grinding arm device, and shut down the machine tool.

[0014] More preferably, the machining parameters include the number of teeth and diameter of the spline in the deep hole, as well as the movement angle of the machine tool turntable motor.

[0015] More preferably, in step S3, when the probe extends into the interior of the deep hole spline blank, when the probe touches the inner spline machining surface, the machine tool brakes and records the current probe coordinates, and the coordinates of the inner spline centerline are determined according to the principle of three points determining a circle.

[0016] Compared with the prior art, the beneficial effects of the present invention are: By employing a trapezoidal internal grinding arm designed specifically for deep-hole internal spline grinding, the structural rigidity and vibration resistance of the grinding device during deep-hole internal spline machining are effectively improved. This significantly reduces grinding wheel runout and vibration caused by cantilever deflection, thereby enhancing the stability and machining accuracy of the grinding process. Compared to traditional internal grinding arm structures, this structure, while ensuring sufficient rigidity, possesses excellent mass distribution characteristics, maintaining system rigidity during the grinding of workpieces with a large aspect ratio, suppressing structural deformation, and improving workpiece surface integrity. Furthermore, the trapezoidal internal grinding arm structure proposed in this invention is applicable to various types of deep-hole internal splines, possessing advantages such as compact structure and strong adaptability, and can be widely used in the stable grinding of high-precision deep-hole internal splines.

[0017] Meanwhile, the grinding wheel holder is composed of a cover plate and a frame, and a baffle is also provided at the end of the frame near the grinding head, dividing the grinding wheel holder into an open structure and a closed structure. The end near the grinding head is an open structure, so when the grinding wheel wears out, the cover plate can be quickly removed to replace the grinding wheel. The end near the transmission mechanism is a closed structure, which can prevent the grinding debris generated during the processing from entering the transmission mechanism. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the grinding head structure of the present invention; Figure 3 This is a side view of the overall structure of the present invention; Figure 4 This is a front view of the grinding wheel frame structure of the present invention; Figure 5 This is a side view of the grinding wheel frame structure of the present invention; Figure 6 This is a rear view of the grinding wheel frame structure of the present invention; In the diagram: 1. Cover plate; 2. Frame; 3. First fastening screw; 4. Drive motor; 5. Flat key; 6. Synchronous pulley; 7. Synchronous belt; 8. Grinding head; 81. Grinding wheel spindle; 82. First end cover; 83. First bearing; 84. Connecting key; 85. Synchronous belt pulley; 86. Expansion sleeve; 87. First grinding wheel flange; 88. Grinding wheel; 89. Second grinding wheel flange; 810. Retaining ring; 811. Second end cover; 812. Second bearing; 813. Second fastening screw; 9. Connecting bolt; 10. First reserved hole; 11. Second reserved hole; 12. Positioning bolt; 13. Positioning hole. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-6 The present invention provides a technical solution: A special internal grinding arm device for grinding deep hole internal splines includes a grinding wheel frame and a grinding head 8 fixed to the surface of a machine tool turntable; The grinding wheel frame includes a cover plate 1 and a frame 2. The frame 2 is internally connected to a transmission mechanism and a grinding head 8. The overall structure of the grinding wheel frame is a trapezoidal structure with a larger cross section on the side closer to the transmission mechanism and a smaller cross section on the side closer to the grinding head 8. The transmission mechanism includes a drive motor 4 with a drive shaft passing through the bottom of the frame 2. The drive end of the drive motor 4 is connected to the grinding head 8 through a synchronous pulley 6 and a synchronous belt 7. The grinding head 8 includes a grinding wheel spindle 81 connected between the cover plate 1 and the frame 2. A timing pulley 85 connected to the timing belt 7 is sleeved on the outside of the grinding wheel spindle 81. A grinding wheel 88 is also fixedly connected to the outside of the grinding wheel spindle 81 by a fastening mechanism.

[0021] In this invention, the frames 2 and the cover plate 1 are symmetrically provided with second reserved holes 11. A first bearing 83 and a second bearing 812 are respectively embedded inside the two second reserved holes 11. A grinding wheel spindle 81 is rotatably connected between the first bearing 83 and the second bearing 812. A first end cap 82 and a second end cap 811 are respectively provided at the ends of the first bearing 83 and the second bearing 812 that are far apart from each other, and the first end cap 82 and the second end cap 811 are respectively fixedly connected to the frames 2 and the cover plate 1. The axial displacement of both the first bearing 83 and the second bearing 812 is restricted by the shoulder of the grinding wheel spindle 81 and the first end cap 82 and the second end cap 811.

[0022] In this invention, a connecting key 84 is provided axially at the connection point between the surface of the grinding wheel spindle 81 and the synchronous pulley 85. A keyway that mates with the connecting key 84 is provided inside the synchronous pulley 85. A second fastening screw 813 is symmetrically connected to the other end of the synchronous pulley 85 at a position corresponding to the keyway. The end of the second fastening screw 813 is connected to the surface of the grinding wheel spindle 81. The grinding wheel spindle 81 and the synchronous pulley 85 transmit power via the connecting key 84, and the synchronous pulley 85 is axially positioned via the second fastening screw 813.

[0023] In this invention, the fastening mechanism includes an expansion sleeve 86 connected to the surface of the grinding wheel spindle 81. A grinding wheel 88, a first grinding wheel flange 87, and a second grinding wheel flange 89 are fitted around the outer side of the expansion sleeve 86. The first and second grinding wheel flanges 87 and 89 are symmetrically arranged on both sides of the grinding wheel 88. Multiple tapered holes are evenly arranged axially inside the expansion sleeve 86, and each tapered hole is connected to a fixing bolt. A retaining ring 810 is also provided at the end of the fixing bolt away from the expansion sleeve 86, and the retaining ring 810 is fitted onto the shoulder of the grinding wheel spindle 81. The first and second grinding wheel flanges 87 and 89 are used to clamp and fix the grinding wheel 88, protect the grinding wheel 88, and maintain its coaxiality with the grinding wheel spindle 81. The expansion sleeve 86 is used to connect the grinding wheel spindle 81 and the grinding wheel 88 and transmit the power of the grinding wheel spindle 81 to the grinding wheel 88. The tightening force of the fixing bolt is converted into radial tightening force through the tapered hole inside the expansion sleeve 86, forming sufficient contact pressure between the grinding wheel spindle 81 and the grinding wheel 88, thereby generating friction to achieve torque transmission.

[0024] In this invention, a first reserved hole 10 is also provided at the other end of the surface of the frame 2. The drive shaft of the drive end of the drive motor 4 is installed through the first reserved hole 10. The drive motor 4 is fixedly connected to the surface of the frame 2 by connecting bolts 9 and multiple connecting holes on the outer circumferential side of the first reserved hole 10. A baffle is also provided at the end of the frame 2 near the grinding head 8, dividing the grinding wheel frame into an open structure and a closed structure. One end of the grinding head 8 is an open structure, so that when the grinding wheel 88 is worn, the cover plate 1 can be quickly removed to replace the grinding wheel 88. The end near the transmission mechanism is a closed structure, which can prevent the grinding debris generated during the processing from entering the transmission mechanism.

[0025] In this invention, a flat key 5 is provided on the surface of the drive shaft at the drive end of the drive motor 4 along the axial direction, and a keyway that cooperates with the flat key 5 is provided inside the synchronous wheel 6. A first fastening screw 3 is connected through the other end of the synchronous wheel 6 at a position symmetrical to the keyway, and the end of the first fastening screw 3 is connected to the surface of the drive shaft.

[0026] In this invention, the frame 2 has multiple threaded holes on one end surface near the cover plate 1, and the cover plate 1 has positioning holes 13 at the corresponding positions of the threaded holes. The frame 2 and the cover plate 1 are fixedly connected by multiple positioning bolts 12 in conjunction with the positioning holes 13 and the threaded holes.

[0027] The present invention also provides a technical solution: a processing method for a special internal grinding arm device for deep hole internal spline grinding, comprising the following steps: S1. Pre-processing: Based on the structure of the deep hole spline, the machining parameters are calculated and adjusted by the machine tool software; S2. Place the machined deep hole spline in the workpiece clamping device of the machine tool and fix it. S3. Start the machine tool, set the machine tool probe as the origin coordinate, and drive the probe to move along the xyz directions through the machine tool slide rail, so that the probe extends into the interior of the deep hole spline blank, and determine the coordinates of the central axis of the internal spline through the probe; S4. Set the center of grinding wheel 88 as the origin coordinate. Align the center of grinding wheel 88 with the central axis of the internal spline according to the movement trajectory of the probe in step S3. Set the offset according to the internal spline tooth profile machining parameters obtained in step S1. S5. Drive motor 4 is turned on. Grinding wheel 88 is slowly fed and grinds the internal spline until the tooth profile is completely machined. Grinding wheel 88 then moves back to the central axis of the internal spline and exits the internal spline blank. S6. After the machine tool turntable rotates a certain angle according to the processing parameters in step S1, repeat steps S4-S5. After all the tooth profiles have been processed, turn off the drive motor 4 switch, reset the internal grinding arm device, and shut down the machine tool.

[0028] In this invention, the processing parameters include the number of teeth and diameter of the spline in the deep hole, as well as the movement angle of the machine tool turntable motor.

[0029] In this invention, in step S3, when the probe extends into the interior of the deep hole spline blank, the machine tool brakes and records the current probe coordinates when the probe touches the inner spline machining surface. Based on the principle of three points determining a circle, the coordinates of the inner spline centerline are determined.

[0030] Example: The drive shaft of the drive motor 4 passes through the first pre-drilled hole 10. A flat key 5 is axially arranged on the surface of the drive shaft. The keyway inside the synchronous pulley 6 cooperates with the flat key 5, allowing the synchronous pulley 6 to be fitted onto the drive shaft. A first fastening screw 3 is passed through and connected at a position symmetrical to the keyway at the other end of the synchronous pulley 6, so that the end of the first fastening screw 3 is connected to the surface of the drive shaft, thereby fixing the synchronous pulley 6. Finally, the drive motor 4 is fixedly connected to the surface of the frame 2 by connecting bolts 9 that cooperate with multiple connecting holes on the outer circumferential direction of the first pre-drilled hole 10. A first bearing 83 and a second bearing 813 are respectively embedded in the two second reserved holes 11. The grinding wheel spindle 81 is rotatably connected between the first bearing 83 and the second bearing 813. A first end cap 82 and a second end cap 811 are respectively provided at the ends of the first bearing 83 and the second bearing 813 that are far apart from each other, and they are respectively fixedly connected to the frame 2 and the cover plate 1 to limit the axial displacement of the first bearing 83 and the second bearing 813. A connecting key 84 is provided axially at the connection between the surface of the grinding wheel spindle 81 and the synchronous pulley 85. The keyway inside the synchronous pulley 85 cooperates with the connecting key 84 to fit the synchronous pulley 85 onto the grinding wheel spindle 81. A second fastening screw 813 is passed through the other end of the synchronous pulley 85 at a position symmetrical to the keyway, so that the end of the second fastening screw 813 is connected to the surface of the grinding wheel spindle 81, thus completing the fixation of the synchronous pulley 85. Next, an expansion sleeve 86 is installed on the surface of the grinding wheel spindle 81. A first grinding wheel flange 87, a grinding wheel 88, and a second grinding wheel flange 89 are sequentially fitted onto the outside of the expansion sleeve 86, symmetrically positioned on both sides of the grinding wheel 88. Fixing bolts are connected to multiple tapered holes evenly spaced axially inside the expansion sleeve 86. A retaining ring 810 is installed at the end of the fixing bolts away from the expansion sleeve 86, and the retaining ring 810 is fitted onto the shoulder of the grinding wheel spindle 81. The grinding wheel 88 is fixed by tightening the fixing bolts. A timing belt 87 is then fitted onto the timing pulley 6 and the timing belt pulley 85, ensuring that the timing belt 87 is properly tensioned to guarantee the stability and accuracy of the transmission.

[0031] Place the cover plate 1 on the frame 2, align the positioning hole 13 with the threaded hole, and then use multiple positioning bolts 12 to pass through the positioning hole 13 and screw them into the threaded hole to fix the frame 2 and the cover plate 1 together, ensuring that the connection is firm and the positional accuracy between the two meets the requirements.

[0032] Take a deep-hole internal spline with 10 internal spline teeth, a diameter of 50 mm, and a length-to-diameter ratio of 8 as an example. Pre-processing: Based on the structure of the spline inside the deep hole, the machining parameters are calculated by the machine tool software, where the movement angle of the machine tool rotary table motor is 36° (360° / 10). Place the deep hole spline blank in the workpiece clamping device of the machine tool to ensure it is firmly fixed and prevent displacement during processing. The machine tool is powered on, and the probe is set as the origin coordinate. The probe moves along the x, y, and z directions via the machine tool's slide rails, allowing it to penetrate into the deep-hole spline blank. When the probe touches the machined surface of the internal spline, the machine tool brakes and records the current probe coordinates. Based on the principle of three points determining a circle, the coordinates of the central axis of the internal spline are determined. Set the grinding wheel center as the origin coordinate, align the grinding wheel center with the internal spline centerline according to the probe's movement trajectory, and set the offset according to the internal spline tooth profile machining parameters. Drive motor 4 is turned on, and grinding wheel 88 slowly feeds and grinds the internal spline until the tooth profile is fully machined. Afterward, the center of grinding wheel 88 moves back to the central axis of the internal spline and exits the internal spline blank. After the machine tool rotary table rotates at a 36° angle, the above positioning, parameter setting, and grinding process is repeated until all 10 teeth are machined. Finally, the drive motor 4 switch is turned off, the internal grinding arm device is reset, and the machine tool is shut down. Testing revealed that the deep-hole internal splines processed using this device and method met high-precision requirements in terms of tooth profile error, tooth direction fluctuation, and coaxiality, and exhibited good surface integrity, fully demonstrating the advantages of this device in deep-hole internal spline processing.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A special internal grinding arm device for deep hole internal spline grinding, characterized in that, Includes a grinding wheel holder and a grinding head (8) fixed to the surface of the machine tool rotary table; The grinding wheel frame includes a cover plate (1) and a frame (2). The frame (2) is internally connected to a transmission mechanism and a grinding head (8). The overall structure of the grinding wheel frame is a trapezoidal structure with a larger cross section on the side closer to the transmission mechanism and a smaller cross section on the side closer to the grinding head (8). The transmission mechanism includes a drive motor (4) with a drive shaft passing through the bottom of the frame (2), and the drive end of the drive motor (4) is connected to the grinding head (8) through a synchronous pulley (6) and a synchronous belt (7). The grinding head (8) includes a grinding wheel spindle (81) connected between the cover plate (1) and the frame (2). A timing pulley (85) connected to the timing belt (7) is sleeved on the outside of the grinding wheel spindle (81). A grinding wheel (88) is also fixedly connected to the outside of the grinding wheel spindle (81) by a fastening mechanism.

2. The internal grinding arm device for deep hole internal spline grinding according to claim 1, characterized in that: The frame (2) and the cover plate (1) are symmetrically provided with second reserved holes (11). The two second reserved holes (11) are respectively embedded with a first bearing (83) and a second bearing (812). A grinding wheel spindle (81) is rotatably connected between the first bearing (83) and the second bearing (812). The ends of the first bearing (83) and the second bearing (812) that are far apart from each other are respectively provided with a first end cap (82) and a second end cap (811). The first end cap (82) and the second end cap (811) are respectively fixedly connected to the frame (2) and the cover plate (1).

3. The internal grinding arm device for deep hole internal spline grinding according to claim 1, characterized in that: A connecting key (84) is provided along the axial direction at the connection between the surface of the grinding wheel spindle (81) and the timing pulley (85). The timing pulley (85) has a keyway that cooperates with the connecting key (84). A second fastening screw (813) is connected through the other end of the timing pulley (85) at a position symmetrical to the keyway. The end of the second fastening screw (813) is connected to the surface of the grinding wheel spindle (81).

4. The internal grinding arm device for deep hole internal spline grinding according to claim 1, characterized in that: The fastening mechanism includes an expansion sleeve (86) connected to the surface of the grinding wheel spindle (81). The expansion sleeve (86) is fitted with a grinding wheel (88), a first grinding wheel flange (87), and a second grinding wheel flange (89). The first grinding wheel flange (87) and the second grinding wheel flange (89) are symmetrically arranged on both sides of the grinding wheel (88). The expansion sleeve (86) has a plurality of tapered holes evenly arranged along the axial direction inside, and each tapered hole is connected with a fixing bolt. A retaining ring (810) is also provided at the end of the fixing bolt away from the expansion sleeve (86). The retaining ring (810) is fitted on the shoulder of the surface of the grinding wheel spindle (81).

5. The internal grinding arm device for deep hole internal spline grinding according to claim 2, characterized in that: The other end of the surface of the frame (2) is also provided with a first reserved hole (10). The drive shaft of the drive end of the drive motor (4) is provided through the first reserved hole (10). The drive motor (4) is fixedly connected to the surface of the frame (2) by connecting bolts (9) and multiple connecting holes on the outer circumferential direction of the first reserved hole (10).

6. The internal grinding arm device for deep hole internal spline grinding according to claim 1, characterized in that: A flat key (5) is provided on the surface of the drive shaft at the drive end of the drive motor (4) along the axial direction. A keyway that cooperates with the flat key (5) is provided inside the synchronous wheel (6). A first fastening screw (3) is connected through the other end of the synchronous wheel (6) at a position symmetrical to the keyway. The end of the first fastening screw (3) is connected to the surface of the drive shaft.

7. The internal grinding arm device for deep hole internal spline grinding according to claim 1, characterized in that: The frame (2) has multiple threaded holes on one end surface near the cover plate (1), and the cover plate (1) has positioning holes (13) at the corresponding positions of the threaded holes. The frame (2) and the cover plate (1) are fixedly connected by multiple positioning bolts (12) in conjunction with the positioning holes (13) and the threaded holes.

8. The processing method of the internal grinding arm device for deep hole internal spline grinding according to claims 1-7, characterized in that, Includes the following steps: S1. Pre-processing: Based on the structure of the deep hole spline, the machining parameters are calculated and adjusted by the machine tool software; S2. Place the machined deep hole spline in the workpiece clamping device of the machine tool and fix it. S3. Start the machine tool, set the machine tool probe as the origin coordinate, and drive the probe to move along the xyz directions through the machine tool slide rail, so that the probe extends into the interior of the deep hole spline blank, and determine the coordinates of the central axis of the internal spline through the probe; S4. Set the center of the grinding wheel (88) as the origin coordinate, align the center of the grinding wheel (88) with the axis of the inner spline according to the movement trajectory of the probe in step S3, and set the offset according to the machining parameters of the inner spline tooth profile obtained in step S1. S5. Drive motor (4) is turned on, grinding wheel (88) is slowly fed and grinds the internal spline until the tooth profile is completely machined. The center of grinding wheel (88) moves back to the central axis of the internal spline and exits the internal spline blank. S6. After the machine tool turntable rotates at a certain angle according to the processing parameters of S1, repeat steps S4-S5. After all the teeth are processed, turn off the drive motor (4) switch, reset the internal grinding arm device, and shut down the machine tool.

9. The processing method of the internal grinding arm device for deep hole internal spline grinding according to claim 8, characterized in that: The machining parameters include the number of teeth and diameter of the spline in the deep hole, as well as the movement angle of the machine tool turntable motor.

10. The processing method of the internal grinding arm device for deep hole internal spline grinding according to claim 8, characterized in that: In step S3, when the probe extends into the interior of the deep hole spline blank, the machine tool brakes and records the current probe coordinates when the probe touches the inner spline machining surface. Based on the principle of three points determining a circle, the coordinates of the inner spline centerline are determined.

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