A circumferential distribution high position degree precision pin hole processing process method

Abstract

The application relates to the technical field of precision machining, and discloses a circumferential distribution high-positioning-accuracy pin hole machining process method, which comprises the following steps: (1) a positioning stage, comprising coaxial positioning of a gear ring and a rotating table, and longitudinal positioning of a cutter and a pin hole machining position; and (2) a rotating machining stage, wherein the rotating table drives the gear ring to rotate to position the pin hole machining position, and the cutter is controlled to longitudinally move to complete pin hole machining. In the pin hole machining process of the gear ring, only the double positioning of the gear ring and the rotating table and the double positioning of the cutter and the pin hole machining position are needed in advance, and then the steps of "cutter machining pin hole-rotating table rotating by a certain angle-cutter re-machining pin hole-rotating table rotating by a certain angle" are simply repeated, the process is simple, control is convenient, machining is inexpensive, the positioning error of the machined pin hole is less than 0.05 mm, and the machining precision is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of precision machining technology, specifically to a process for machining circumferentially distributed pin holes with high positional accuracy. Background Technology

[0002] The wind turbine gearbox is an important component of a wind power generation system. Its function is to transmit the torque generated by the rotor rotation to the gearbox through a coupling, and then through the gear pairs inside the gearbox to increase the output speed, and finally connect to the generator.

[0003] Gear ring (e.g.) Figure 1 The gear ring (shown in the image) is the core component connecting the gearbox housing and the torque arm. The reliability of the connection between the gear ring and the gearbox housing directly affects the service life of the entire speed-increasing gearbox. Therefore, the gear ring is connected to the gearbox housing using a bolt and pin connection method.

[0004] The current machining process for pin holes on gear rings is as follows: first, the gear ring and housing are connected using a stop joint, and then the pin holes are drilled and reamed using a drilling machine combination. This method effectively ensures that the relative positions of the pin holes on the assembled gear ring and housing coincide, thus guaranteeing the reliability of the pin hole connection between the gear ring and housing. However, with the development of wind power in recent years, gearbox power has increased significantly, and gear ring specifications have also increased dramatically. Currently, the machining process for gear ring pin holes requires custom-made non-standard tools, which are expensive and have a short service life; the operation is labor-intensive; the process lacks versatility and reliability; the stability and efficiency of the assembly quality are reduced; the housing and gear ring are not interchangeable; assembly and management are difficult; and subsequent maintenance costs are high.

[0005] Alternatively, a gantry machining center can be used. However, the machining accuracy of gantry machining heavily depends on the repeatability of the X, Y, and Z axes of the gantry machining center and the accuracy of the points sampled when establishing the coordinate system. Because machining each pin hole requires moving the X, Y, and Z axes, the movement is complex, which can easily lead to positioning accuracy deviations and reduce machining accuracy. Position accuracy using this method can generally reach 0.1mm, but it is difficult to achieve higher requirements such as 0.05mm.

[0006] There is also the use of high-precision large-scale vertical milling and turning composite machining, but the equipment investment is large, resulting in higher processing costs.

[0007] In summary, developing a high-precision, simple, and inexpensive machining process for circumferentially distributed high-positional-accuracy pin holes not only effectively compensates for the shortcomings of existing technologies but also significantly improves machining efficiency and accuracy without increasing equipment costs. This is of great significance for the machining of circumferentially distributed high-positional-accuracy pin holes and the widespread application of related gear rings. Summary of the Invention

[0008] The present invention aims to provide a machining process for circumferentially distributed pin holes with high positional accuracy, so as to solve the technical problem of low machining accuracy in the prior art.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a method for machining pin holes with high positional accuracy in a circular distribution, comprising the following steps: (i) a positioning stage, including coaxial positioning of the gear ring and the rotary table, and longitudinal positioning of the tool and the pin hole machining position; (ii) a rotational machining stage, wherein the rotary table drives the gear ring to rotate and position the pin hole machining position, and controls the longitudinal movement of the tool to complete the pin hole machining.

[0010] The principle and advantages of this scheme are:

[0011] 1. Compared with the existing technology of machining pin holes distributed around the circumference on the gear ring with a gantry machining center, which has low machining accuracy, this solution effectively improves the high positional accuracy and high precision of the pin hole machining by dual positioning of the gear ring and the rotary table, and the tool and the pin hole machining position. It provides a new method for machining circumferentially distributed pin holes, effectively improving the product quality of the machined gear ring, thereby improving the connection reliability between the gear ring and the gearbox, and extending the service life of the entire speed-increasing gearbox.

[0012] 2. Compared to existing technologies where the gear ring is connected to the stop position and then the pin hole is drilled and reamed using a drilling machine, which requires customized equipment and incurs high costs, this solution only requires pre-positioning of the gear ring and rotary table, and the tool and pin hole. Then, it simply repeats the steps of "tool machining pin hole - rotary table rotating a certain angle - tool machining pin hole again - rotary table rotating a certain angle". The process is simple, easy to control, and inexpensive. Moreover, the positional error of the resulting pin hole is less than 0.05mm, significantly improving machining accuracy.

[0013] 3. This solution uses a rotary table to precisely rotate the gear ring at a certain angle to process the pin holes distributed around its circumference. Compared to the complex and energy-intensive pin hole machining process that requires real-time movement of the X, Y, and Z axes of a gantry machining center, this solution only needs to control the rotary table to rotate at a certain angle and control the tool to move up and down a small distance to achieve high positional accuracy and high precision machining of the pin holes on the gear ring. This not only effectively reduces energy consumption and simplifies the control process, but also effectively reduces the machining errors caused by the movement of the X, Y, and Z axes of the gantry machining center, thereby effectively improving machining accuracy and the quality of the gear ring product.

[0014] Preferably, the coaxial positioning of the gear ring and the rotary table, and the longitudinal positioning of the cutting tool and the pin hole machining position are both achieved using a dial indicator.

[0015] Beneficial effects: The above settings in this solution facilitate the reduction of positioning errors of the gear ring and cutting tools, thereby improving the positional accuracy and precision of the pin hole machining on the gear ring.

[0016] Preferably, the specific steps for coaxial positioning of the gear ring and the rotary table are as follows: place the gear ring flat on the rotary table with the surface to be processed facing upwards, and use a dial indicator to measure the displacement of the outer circular surface of the gear ring while rotating the rotary table. Then adjust the position of the gear ring until the gear ring is coaxial with the rotary table.

[0017] Beneficial effects: This solution adopts the above settings and adjusts the position of the gear ring in real time according to the measurement results of the dial indicator, so that it can rotate coaxially with the rotary table, which facilitates the rapid positioning of the gear ring. This results in higher positional accuracy and precision when the tool is machining the pin holes distributed around the circumference of the gear ring, and achieves precise machining of the pin holes on the gear ring.

[0018] Preferably, the criterion for determining whether the gear ring is coaxial with the rotary table is that the displacement d of the outer circular surface of the gear ring is ≦ 0.005 mm as measured by a dial indicator after the rotary table rotates 180°.

[0019] Beneficial effects: The above settings in this solution facilitate the improvement of gear ring positioning accuracy, thereby improving the precision of gear ring pin hole finishing.

[0020] Preferably, after the gear ring is coaxially positioned with the rotary table, it further includes using a fixing member to fix the gear ring to the rotary table; the rotary table is provided with a plurality of parallel sliding grooves, and fasteners are slidably connected in the sliding grooves. The fasteners include a fixing post, a clamping plate and a fixing screw. One end of the clamping plate is hinged to the top of the fixing post. A through groove is opened on the clamping plate. A square head bolt is provided at the bottom of the fixing screw. The square head bolt is slidably connected in the sliding groove. The fixing screw passes through the through groove and cooperates with the nut.

[0021] Beneficial effects: The above-mentioned setup facilitates the fixing of the positioned gear ring on the rotary table, preventing it from vibrating during pin hole machining and affecting machining accuracy. Furthermore, the parallel slide groove allows the fasteners to slide and adjust their fixed position within the groove, enabling the rotary table to be used for fixing gear rings of different sizes and improving the machining adaptability of the rotary table.

[0022] Preferably, the cutting tool is connected to a cutting tool driving device, which includes a support column, a transverse driving component, and a longitudinal driving component connected in sequence. The cutting tool is installed at the bottom of the longitudinal driving component. The transverse driving component and the support column, as well as the cutting tool and the longitudinal driving component, are coaxially fixed. The longitudinal driving component is perpendicularly fixed to the transverse driving component. The end face of the support column near the cutting tool has a liquid spray hole.

[0023] Beneficial effects: This solution uses support columns to facilitate the spatial positioning of the cutting tool, lateral drive components to adjust the tool's position according to different gear ring sizes (such as diameter), and longitudinal support components to facilitate tool position adjustment according to different gear ring heights and to facilitate longitudinal machining of pin holes. Water spray holes are provided on the end face of the support columns near the tool to cool the cutting tool and drive motor during machining, protecting the tool and drive components while effectively reducing tool temperature and preventing excessive tool temperature from affecting machining accuracy.

[0024] Preferably, in the (ii) rotary machining stage, the controller controls the rotation of the rotary table and the machining of pin holes by the cutting tool. A drive motor is provided below the rotary table, and the controller is electrically connected to the drive motor, the transverse drive component, the longitudinal drive component, and the cutting tool.

[0025] Beneficial Effects: This solution, with the above-mentioned setup, facilitates the automated machining of pin holes in the circumferential direction of the gear ring by remote control of the cutting tool. Specifically, during the rotary machining process, the controller activates the lifting cylinder to bring the tip of the drill-reamer close to the pin hole machining position on the upper surface of the gear ring, using this as the initial position. Information such as the drill-reamer's lifting distance and the rotation angle of the rotary table are input into the PLC controller. Subsequently, the controller activates the longitudinal drive to move the cutting tool downwards while simultaneously initiating the tool's rotation to machine the pin hole. After machining one pin hole, the controller stops the tool's rotation and controls the longitudinal drive to move the cutting tool upwards to the initial position. Then, the controller controls the drive motor to start, causing the rotary table to rotate a certain angle until the adjacent pin hole machining position is aligned with the tool's central axis. By repeatedly controlling the cutting tool to machine the pin holes and the rotary table to rotate a certain angle, continuous machining of pin holes in the circumferential direction of the gear ring can be achieved.

[0026] Preferably, the longitudinal positioning of the tool and pin hole machining position includes the following steps: marking the centrally symmetrical pin hole one and pin hole two on the gear ring, using a dial indicator to align the tool spindle with the center of pin hole one, rotating the rotary table 180°, using a dial indicator to align the tool spindle with the center of pin hole two, and during the alignment process, moving the tool spindle laterally along the radius of the rotary table until pin hole one and pin hole two have rotated 180° through the rotary table, and then using the dial indicator to detect the offset r≦0.005mm.

[0027] Beneficial effect: By adopting the above settings, this solution facilitates the improvement of the positioning accuracy of the tool and pin hole machining positions, thereby improving the positional accuracy of the pin holes in the circumferential direction of the gear ring and improving the machining quality of the pin holes of the gear ring.

[0028] Preferably, in the positioning stage (a), the longitudinal positioning of the tool and pin hole machining position is achieved by using a fixture and a dial indicator to assist in positioning the tool and pin hole machining position. The fixture is annular, with pin hole three and pin hole four symmetrically arranged on the center of the upper surface. The outer circular surface of the fixture has a convex ring that mates with the outer circular surface of the gear ring. The longitudinal positioning of the tool and pin hole machining position includes the following steps: placing the fixture on the gear ring, using a dial indicator to align the tool spindle with the center of pin hole three, rotating the rotary table 180°, and using a dial indicator to align the tool spindle with the center of pin hole four. During the alignment process, the tool spindle is moved laterally along the radius of the rotary table until pin hole three and pin hole four have rotated 180° through the rotary table. The dial indicator detects an offset r ≦ 0.005 mm.

[0029] Beneficial effects: This solution features a convex ring on the outer surface of the tooling that mates with the outer surface of the gear ring, facilitating rapid coaxial positioning of the tooling and gear ring, saving time required for tooling and gear ring positioning, and effectively improving positioning efficiency. Furthermore, the combination of pin hole one, pin hole two, and a dial indicator for tool positioning effectively and accurately positions the tool and pin hole machining positions, improving the pin hole machining position accuracy, and thus improving the quality of gear ring pin hole machining.

[0030] Preferably, in the (i) positioning stage, a tooling for positioning the gear ring and the tool is designed. The tooling includes an inner ring platform and an outer protrusion. The protrusion is higher than the ring platform, and the inner diameter surface of the protrusion is coaxially clearance-fitted with the outer circular surface of the gear ring. Pin holes three and four are symmetrically provided on the upper surface of the ring platform. The longitudinal positioning of the tool and the pin hole machining position includes the following steps: using a dial indicator to align the tool spindle with the center of pin hole three, rotating the rotary table 180°, and using a dial indicator to align the tool spindle with the center of pin hole four. During the alignment process, the tool spindle is moved laterally along the radius of the rotary table until pin holes three and four are rotated 180° by the rotary table. The dial indicator detects an offset r≦0.005mm.

[0031] Beneficial effects: The above-mentioned setup allows for rapid positioning of the gear ring through the coaxial clearance fit between the tooling and the gear ring. This enables quick positioning and machining of the gear ring after tooling positioning. Furthermore, there is no need to reposition the gear ring when changing it for machining, thus effectively saving gear ring positioning time. As a result, this solution improves both machining accuracy and gear ring machining efficiency. Attached Figure Description

[0032] Figure 1 This is a top view of the gear ring manufactured according to the present invention.

[0033] Figure 2 This is a cross-sectional schematic diagram of the device used for machining high positional accuracy pin holes in the circumferentially distributed pin hole machining process of Embodiment 1 of the present invention.

[0034] Figure 3 This is a perspective view of the circumferentially distributed high positional accuracy pin hole processing device used in Embodiment 1 of the present invention.

[0035] Figure 4 This is a cross-sectional schematic diagram of the high positional accuracy pin hole processing device used in Embodiment 2 of the present invention.

[0036] Figure 5 This is a cross-sectional view of the circumferentially distributed high positional accuracy pin hole processing device used in Embodiment 3 of the present invention during the tooling-assisted positioning stage.

[0037] Figure 6 This is a cross-sectional structural diagram of the high positional accuracy pin hole machining device with circumferential distribution used in Embodiment 3 of the present invention during the pin hole rotation machining stage.

[0038] Figure 7 This is a perspective view of the circumferentially distributed high positional accuracy pin hole processing device used in Embodiment 3 of the present invention. Detailed Implementation

[0039] The following detailed description illustrates the specific implementation method:

[0040] The reference numerals in the accompanying drawings include: rotary table 1, slide 11, fastener 12, fixing post 121, clamping plate 122, fixing screw 123, gear ring 3, pin hole one 31, pin hole two 32, cutting tool 4, lifting cylinder 5, horizontal cylinder 6, support column 7, spray hole 71, tooling 8, pin hole three 81, and pin hole four 82.

[0041] Example 1

[0042] This embodiment is basically as follows: Figures 2-3 As shown: This solution provides a device for machining pin holes with high positional accuracy in a circular distribution, including a controller, a rotary table 1, and a cutting tool 4. A drive motor is provided below the rotary table 1. For reference, the drive motor is a servo motor. The rotary table 1 is provided with several parallel sliding grooves 11. Fasteners 12 are slidably connected in the sliding grooves 11. The fasteners 12 include a fixing post 121, a clamping plate 122, and a fixing screw 123. The lower end of the fixing post 121 is slidably connected in the sliding groove 11. The clamping plate 122 is provided with a U-shaped through groove. One end of the opening of the U-shaped through groove is hinged to the top of the fixing post 121. The bottom of the fixing screw 123 is provided with a square head bolt. The square head bolt is slidably connected in the sliding groove 11. The fixing screw 123 passes through the U-shaped through groove and engages with a nut. In this scheme, after the gear ring 3 is positioned with the rotary table 1, the fixing pile 121 and the fixing screw 123 are moved to a suitable position, the clamping plate 122 is placed in a horizontal position to clamp the gear ring 3, and the nut and screw are engaged to fix the gear ring 3 on the rotary table 1.

[0043] The cutting tool 4 is connected to a cutting tool 4 driving device, which includes a support column 7, a transverse driving component, and a longitudinal driving component connected in sequence. The cutting tool 4 is mounted at the bottom of the longitudinal driving component. The transverse driving component and the support column 7, as well as the cutting tool 4 and the longitudinal driving component, are coaxially fixed. The longitudinal driving component is perpendicularly fixed to the transverse driving component. A spray hole 71 is opened on the end face of the support column 7 near the cutting tool 4. As a reference, in this embodiment, the cutting tool 4 includes a drill reamer and a drilling motor that drives the drill reamer to rotate. The longitudinal driving component is a lifting cylinder 5, and the transverse driving component is a transverse cylinder 6. The controller is electrically connected to the servo motor, the transverse cylinder 6, the lifting cylinder 5, and the drilling motor.

[0044] For reference, the controller in this solution is a PLC controller. The PLC controller, servo motor, horizontal cylinder 6, lifting cylinder 5 and drilling motor and their control principles are all existing technologies. Models can be selected as needed, and will not be described in detail here.

[0045] This solution also provides a machining process for circumferentially distributed pin holes with high positional accuracy, including the following steps:

[0046] (i) Positioning stage, including coaxial positioning of gear ring 3 and rotary table 1, and longitudinal positioning of tool 4 and pin hole machining position; wherein, the coaxial positioning of gear ring 3 and rotary table 1 and the longitudinal positioning of tool 4 and pin hole machining position are both performed using dial indicator.

[0047] S1. The gear ring 3 is coaxially positioned with the rotary table 1, including the following steps: Place the gear ring 3 flat on the rotary table 1 with the surface to be machined facing upwards. While rotating the rotary table 1, use a dial indicator to measure the displacement of the outer circular surface of the gear ring 3. Then adjust the position of the gear ring 3 until the gear ring 3 is coaxial with the rotary table 1. The criterion for judging whether the gear ring 3 is coaxial with the rotary table 1 is that after the rotary table 1 is rotated 180°, the displacement d of the outer circular surface of the gear ring 3 measured by the dial indicator is ≦ 0.005 mm.

[0048] S2. Gear ring 3 is fixed. After gear ring 3 is coaxially positioned with rotary table 1, a fastener is used to fix gear ring 3 to rotary table 1 to prevent it from shaking during pin hole machining and affecting machining accuracy.

[0049] S3. The longitudinal positioning of the cutting tool 4 and the pin hole machining position includes the following steps: Mark the centrally symmetrical pin hole 31 and pin hole 32 on the gear ring 3, that is, the line connecting the centers of pin hole 31 and pin hole 32 passes through the center of the gear ring 3. In this embodiment, pin hole 31 and pin hole 32 are pre-roughly machined on the gear ring 3 to be machined; use a dial indicator to align the spindle of the cutting tool 4 with the center of pin hole 31, rotate the rotary table 180°, and use a dial indicator to align the spindle of the cutting tool 4 with the center of pin hole 32. During the alignment process, the PLC controller starts the transverse cylinder 6, so that the spindle of the cutting tool 4 moves laterally along the radius direction of the rotary table 1 until pin hole 31 and pin hole 32 have rotated 180° through the rotary table 1. The dial indicator detects the offset r≦0.005mm.

[0050] (II) Rotary machining stage: Rotary table 1 drives gear ring 3 to rotate and position the pin hole for machining, and controls the longitudinal movement of tool 4 to complete the pin hole machining. Specific machining steps are as follows:

[0051] S4. Preparation: The PLC controller starts the lifting cylinder 5 to bring the tip of the drill reamer close to the pin hole machining position on the upper surface of the gear ring 3, and uses this as the initial position; it also inputs information such as the lifting distance of the drill reamer and the rotation angle of the rotary table 1 into the PLC controller; the rotation angle is determined as follows: if there are 16 pin holes evenly distributed on the gear ring 3, the rotary table 1 needs to rotate 360 / 16 = 22.5° after machining one hole; if the pin holes are not evenly distributed, the angle can be adjusted according to the actual angle.

[0052] S5, Pin Hole Machining: The PLC controller starts the lifting cylinder 5 to push the tool 4 downward while simultaneously starting the tool 4 to rotate and machine the pin hole; after machining one pin hole, the PLC controller stops the rotation of the tool 4 and controls the lifting cylinder 5 to pull the tool 4 upward to the initial position.

[0053] S6, Pin Hole Switching: The PLC controller starts the servo motor, causing the rotary table 1 to rotate a certain angle until the adjacent pin hole processing position is aligned with the central axis of the tool 4.

[0054] Then repeat steps S5 and S6 to complete the high positional accuracy machining of the pin hole in the circumferential direction of gear ring 3.

[0055] This method uses a dial indicator for measurement, with an estimated error of approximately 0.02 mm. Taking a gear ring 3 with 16 pin holes as an example, with a distribution circle φ1935 and a rotational positioning accuracy of 6″, the chord length error is approximately 1935×π / (360×60×60)×6≈0.028 mm. When there are many pin holes, the chord length direction is close to 90° with the radius direction, meaning the theoretical positional error of the 16 pin holes is calculated... The gear ring 3 processed by this scheme was inspected using the three-coordinate measuring machine. The positional accuracy of its pin hole was within the range of 0.035 to 0.045 mm, which fully meets the positional accuracy requirement of 0.05 mm.

[0056] Example 2

[0057] To further improve the machining efficiency of the pin holes in the circumferential direction of the gear ring, the difference between this solution and Example 1 is that, as Figure 4 As shown, in the positioning stage (I), the longitudinal positioning of the tool 4 and the pin hole machining position is achieved by using fixture 8 and a dial indicator to assist in positioning the tool 4 and the pin hole machining position. Fixture 8 is annular. In this embodiment, the inner diameter of fixture 8 is larger than the inner diameter of gear ring 3, which facilitates the use of fastener 12 to fix the inner surface of gear ring 3 and then fitting fixture 8 onto the outer surface of gear ring 3. Pin hole 3 81 and pin hole 4 82 are symmetrically provided on the upper surface of fixture 8. The outer surface of fixture 8 is provided with a convex ring that mates with the outer surface of gear ring 3. The longitudinal positioning of the tool 4 and the pin hole machining position includes the following steps: using a dial indicator to align the spindle of tool 4 with the center of pin hole 3 81, rotating the rotary table 180°, and using a dial indicator to align the spindle of tool 4 with the center of pin hole 4 82. During the alignment process, the spindle of tool 4 is moved laterally along the radius of rotary table 1 until pin hole 3 81 and pin hole 4 82 have rotated 180° through rotary table 1. The dial indicator detects an offset r ≦ 0.005 mm.

[0058] In this embodiment, the tooling 8 has a convex ring that mates with the outer surface of the gear ring 3, which facilitates the rapid coaxial positioning of the tooling 8 and the gear ring 3, saving the time required for positioning the tooling 8 and the gear ring 3. The tooling 8 effectively avoids the time spent on rough machining the pin holes on the gear ring 3, thereby improving the positioning efficiency. The tooling 4 is positioned by using a combination of pin hole 3 81, pin hole 4 82 and a dial indicator, which effectively and accurately positions the tooling 4 and the pin hole machining position, improving the pin hole machining position accuracy and thus improving the quality of the pin hole machining on the gear ring 3.

[0059] Example 3

[0060] To further improve the machining efficiency of the pin holes in the circumferential direction of the gear ring, the difference between this solution and Example 1 is that, as Figures 5-7As shown, in the positioning stage (I), a fixture 8 is designed to assist in positioning the gear ring 3 and the tool 4. The fixture 8 includes an inner ring platform and an outer protrusion. The protrusion is higher than the ring platform, and the inner diameter surface of the protrusion is coaxially clearance-fitted with the outer circular surface of the gear ring 3. In this embodiment, the inner diameter of the fixture 8 is smaller than the inner diameter of the gear ring 3, so that the ring platform of the fixture 8 can accommodate the gear ring 3. The upper surface of the ring platform is symmetrically provided with pin holes 3 81 and 4 82. The longitudinal positioning of the tool 4 and the pin hole machining position includes the following steps: using a dial indicator to align the spindle of the tool 4 with the center of pin hole 3 81, rotating the rotary table 180°, and using a dial indicator to align the spindle of the tool 4 with the center of pin hole 4 82. During the alignment process, the spindle of the tool 4 is moved laterally along the radial direction of the rotary table 1 until pin hole 3 81 and pin hole 4 82 have rotated 180° through the rotary table 1. The dial indicator detects an offset r ≦ 0.005 mm.

[0061] In this embodiment, the toothed ring 3 can be quickly positioned by the coaxial clearance fit between the tooling 8 and the toothed ring 3. After the tooling 8 is positioned, the toothed ring 3 can be quickly positioned and processed. Moreover, when the toothed ring 3 is replaced for processing, there is no need to reposition the toothed ring 3, thereby effectively saving the positioning time of the toothed ring 3. This solution can improve the processing accuracy and the processing efficiency of the toothed ring 3.

[0062] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for machining circumferentially distributed pin holes with high positional accuracy, characterized in that: Includes the following steps: (a) Positioning stage, including coaxial positioning of the gear ring and the rotary table, and longitudinal positioning of the cutting tool and the pin hole machining position; The specific steps for coaxial positioning of the gear ring and the rotary table are as follows: Place the gear ring flat on the rotary table with the surface to be processed facing upwards, and while rotating the rotary table, use a dial indicator to measure the displacement of the outer circular surface of the gear ring. Then adjust the position of the gear ring until the gear ring and the rotary table are coaxial, and the displacement d≦0.005mm. After the gear ring and the rotary table are coaxially positioned, the gear ring is also fixedly connected to the rotary table using fasteners. The longitudinal positioning of the tool and pin hole machining position includes the following steps: mark the centrally symmetrical pin hole one and pin hole two on the gear ring, use a dial indicator to align the tool spindle with the center of pin hole one, rotate the rotary table 180°, use a dial indicator to align the tool spindle with the center of pin hole two, and during the alignment process, move the tool spindle laterally along the radius of the rotary table until pin hole one and pin hole two have rotated 180° through the rotary table, and then use the dial indicator to detect the offset r≦0.005mm; (ii) Rotary machining stage: The rotary table drives the gear ring to rotate to position the pin hole machining position, and controls the longitudinal movement of the tool to complete the pin hole machining.

2. A method for machining circumferentially distributed pin holes with high positional accuracy, characterized in that: Includes the following steps: (a) Positioning stage, including coaxial positioning of the gear ring and the rotary table, and longitudinal positioning of the cutting tool and the pin hole machining position; The specific steps for coaxial positioning of the gear ring and the rotary table are as follows: Place the gear ring flat on the rotary table with the surface to be processed facing upwards, and use a dial indicator to measure the displacement of the outer circular surface of the gear ring while rotating the rotary table. Then adjust the position of the gear ring until the gear ring and the rotary table are coaxial, and the displacement d≦0.005mm. After the gear ring and the rotary table are coaxially positioned, the gear ring is fixedly connected to the rotary table using fasteners. The longitudinal positioning of the tool and pin hole machining positions is achieved using a fixture and a dial indicator. The fixture is annular, with pin hole three and pin hole four symmetrically arranged on its upper surface. The outer surface of the fixture has a convex ring that mates with the outer surface of the gear ring. The longitudinal positioning of the tool and pin hole machining positions includes the following steps: using a dial indicator to align the tool spindle with the center of pin hole three, rotating the rotary table 180°, and using the dial indicator to align the tool spindle with the center of pin hole four. During the alignment process, the tool spindle is moved laterally along the radius of the rotary table until pin hole three and pin hole four have rotated 180° past the rotary table. The dial indicator then detects an offset r ≦ 0.005 mm. (ii) Rotary machining stage: The rotary table drives the gear ring to rotate to position the pin hole machining position, and controls the longitudinal movement of the tool to complete the pin hole machining.

3. A method for machining circumferentially distributed pin holes with high positional accuracy, characterized in that: Includes the following steps: (a) Positioning stage, including coaxial positioning of the gear ring and the rotary table, and longitudinal positioning of the cutting tool and the pin hole machining position; The tooling includes a design for positioning the gear ring and the cutting tool. The tooling includes an inner ring platform and an outer protrusion. The protrusion is higher than the ring platform, and the inner diameter surface of the protrusion is coaxially clearance-fitted with the outer circular surface of the gear ring. The upper surface of the ring platform is symmetrically provided with pin holes three and four. The specific steps for coaxial positioning of the gear ring and the rotary table are as follows: place the fixture on the rotary table, and then place the gear ring flat on the fixture with the surface to be processed facing up. The gear ring is quickly positioned by the coaxial clearance fit between the fixture and the gear ring. After the gear ring is coaxially positioned with the rotary table, the method further includes using fasteners to fix the gear ring to the rotary table. The longitudinal positioning of the tool and pin hole machining position includes the following steps: using a dial indicator to align the tool spindle with the center of pin hole three, rotating the rotary table 180°, using a dial indicator to align the tool spindle with the center of pin hole four, and during the alignment process, moving the tool spindle laterally along the radius of the rotary table until pin hole three and pin hole four have rotated 180° through the rotary table, and then using a dial indicator to detect the offset r≦0.005mm; (ii) Rotary machining stage: The rotary table drives the gear ring to rotate to position the pin hole machining position, and controls the longitudinal movement of the tool to complete the pin hole machining.

4. A method for machining circumferentially distributed high-positional-precision pin holes according to any one of claims 1 to 3, characterized in that: The rotating platform is provided with several parallel sliding grooves, and fasteners are slidably connected in the sliding grooves. The fasteners include a fixing post, a clamping plate and a fixing screw. One end of the clamping plate is hinged to the top of the fixing post. A through groove is opened on the clamping plate. A square head bolt is provided at the bottom of the fixing screw. The square head bolt is slidably connected in the sliding groove. The fixing screw passes through the through groove and cooperates with the nut.

5. The method for machining circumferentially distributed high-positional-precision pin holes according to claim 4, characterized in that: The cutting tool is connected to a cutting tool driving device, which includes a support column, a transverse driving component, and a longitudinal driving component connected in sequence. The cutting tool is installed at the bottom of the longitudinal driving component. The transverse driving component and the support column, as well as the cutting tool and the longitudinal driving component, are coaxially fixed. The longitudinal driving component is perpendicularly fixed to the transverse driving component. The end face of the support column near the cutting tool has a liquid spray hole.

6. The method for machining circumferentially distributed high-positional-precision pin holes according to claim 5, characterized in that: In the (ii) rotary machining stage, the controller controls the rotation of the rotary table and the machining of pin holes by the cutting tool. A drive motor is provided below the rotary table. The controller is electrically connected to the drive motor, the transverse drive component, the longitudinal drive component, and the cutting tool.

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