Machining and assembling method for rigid magnet yoke of rotor of large pumped storage generator set

Abstract

The invention discloses a machining and assembling method for a rigid magnet yoke of a rotor of a large pumped storage generator set, and relates to the technical field of generators. According to the machining method, by standardizing the machining technology, machining steps, using tools and the like of the T-shaped super-long key groove in the outer circle of the rigid magnet yoke, the universal method capable of meeting machining of the T-shaped super-long key groove in the outer circle of the rigid magnet yoke of various sizes and specifications is provided, and the machining method capable of meeting the requirement for series manufacturing of machining tools is provided. By means of nine coherent steps and application of three types of machining tools, it is guaranteed that the roundness of the inner circle and the outer circle and the position of an inner key groove are within the technical requirement of a drawing when the magnet yoke section is a single piece, and a reference is provided for follow-up overall stacking. In the overall machining period after the nine magnet yoke sections are stacked, the machining quality of the T-shaped super-long key groove in the outer circle of the magnet yoke is guaranteed to completely meet the technical requirements through the measures of standardizing machining and detecting steps, optimizing a machining tool, standardizing machining parameters of the tool and the like. And the overall size consistency and the quality stability of the T-shaped super-long key groove on the outer circle of the rigid magnet yoke of a hydro-generator and a generator motor of a pumped storage unit are greatly improved. The method has the characteristics of high efficiency, popularization and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, and in particular to a method for processing and assembling a rigid magnetic yoke of a rotor of a large pumped storage generator set. Background Art

[0002] Pumped storage is one of the most mature, economical and large-scale energy storage methods. At present, the common single-unit capacities of domestic pumped-storage power stations are roughly divided into three gears: 250MW, 300MW, 400MW and above, and the corresponding pumped-storage unit speeds are divided into three gears: 250r / min, 428.6r / min, and 500r / min. The increase in the unit speed requires that the strength of the yoke of the pumped-storage unit generator motor must be increased accordingly. For this reason, in the design of pumped-storage units, the yoke sleeve of the generator motor of pumped-storage units with a single unit capacity greater than 300MW is often stacked with an integrated annular yoke segment. In order to distinguish it from the yoke made of silicon steel sheets in the past, the yoke stacked with an integrated annular yoke segment is called a rigid yoke.

[0003] The rigid yoke of a hydro-turbine generator and a pumped-storage power generation motor is generally composed of 9 (or 10) integrated annular yoke segments (hereinafter referred to as yoke segments) stacked together. The single-segment yoke segments are axially positioned by the inner convex and concave stoppers, and the circumferential positioning is performed by three sets of locating pins that are evenly stepped on the outer circles between the yoke segments. The thickness of a single-segment yoke segment is generally around 350mm, and the overall stacking height is around 3150mm. It is combined into one with a tensioning screw that passes through the inside of the yoke segment and has a certain preload. With the diversification of pumped-storage power generation motor products, the size specifications of the rigid yoke are also increasing. In order to meet the manufacturing requirements of standardized processing technology and serialized processing tools, it is necessary to provide a processing method that can meet both the general method of processing the T-shaped extra-long keyway of the outer circle of rigid yokes of various sizes and specifications and the serialized processing tool manufacturing requirements. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the existing rigid yoke outer circle T-shaped extra-long keyway processing technology, and provide a method for processing the rigid yoke outer circle T-shaped extra-long keyway of a hydro-turbine generator and a pumped storage power generation motor, which can meet the processing of rigid yoke outer circle T-shaped extra-long keyways of various sizes and specifications, and has the characteristics of high processing efficiency, serialized tool, wide application range and low cost. The technical solution of the present invention is:

[0005] Step 1. Check the machining allowance of the yoke segment and the dimension lines required for subsequent machining. Mark the T-slot machining reference lines of the yoke segment in detail to provide a reference for subsequent rough machining.

[0006] Step 2. Rough milling of the pole mounting surface of a single yoke segment. Evenly arrange the shims on the turntable of the CNC boring and milling machine, and make them concentric with the center of the turntable based on the inner circle of the yoke segment. Add adjustment shims between the shims and the contact surface of the yoke segment, and level them according to the rough machining stop of the inner circle of the yoke segment. Press the workpiece, and program the rough machining of the pole mounting surface and T-slot of the outer circle of the yoke segment. Remove the excess through rough machining to ensure the stability of subsequent fine machining.

[0007] Step 3. Finishing of the inner circle and upper and lower planes of the single yoke segment. After rough milling of the yoke segment, it is finished by vertical lathe to machine the inner circle and upper and lower planes to the requirements of the drawing. When machining the inner circle, it is important to ensure the consistency of the inner circle size. When machining the upper and lower planes, it is necessary to control the parallelism of the upper and lower surfaces within the optimal size range to provide an accurate alignment reference for the subsequent process.

[0008] Step 4. Finishing of the inner circular keyway and the handle hole of a single yoke segment. Finishing of the inner circular keyway of a single yoke segment is performed on a gantry milling machine. When machining the inner keyway, a milling die is used for angular positioning to ensure that the positions of the keyways in the 9 yoke segments of the same project are consistent. The handle hole is processed while machining the inner circular keyway of a single yoke segment on a gantry milling machine. This can accurately ensure the angle consistency of the inner circular keyway of the yoke segment and the handle hole, providing a strong guarantee for the consistency of the subsequent overall stacking position.

[0009] Step 5. Assemble the yoke segments into a yoke assembly. On the boring machine platform, place the yoke assembly support tool and the jacking jig in a suitable position, and install the oil cylinder, shims and tray. First install the bottom 1st yoke segment, and use the inner circle stop plane of the yoke segment as the reference to measure the level of the yoke segment. By adding shims on the shims, the horizontal circumferential direction of the yoke segments is consistent, and the point difference value is within the technical requirements. After the first yoke segment is installed and tested, install the second yoke segment. The second yoke segment is placed on the upper plane of the first yoke segment, and circumferential positioning is performed by installing three pairs of locating keys at the corresponding positions of the inner keyway. Check the items required in the project as required and record them. After passing the test, install the 3rd to 9th yoke segments in sequence, and test and record them in time after installing each segment. The assembly of the 9 yoke segments into one is called a yoke assembly.

[0010] Step 6. Install the milling die, adjust the concentricity and fix it. Install the milling die on the uppermost yoke section, check and adjust the inner circle of the milling die to be concentric with the inner circle of the yoke assembly with the laser tracker, check the symmetry of the inner keyway and the level of the milling die. After passing the test, install the tool to tighten the screw and tighten it according to the torque required by the drawing. After tightening the screw, use the laser tracker to re-measure the milling die data.

[0011] Step 7. Overall processing of the outer circle T-shaped extra-long keyway of the yoke section. First, rough-process the pole mounting surface and the inter-pole empty knife area. Use an octagonal cutter head, and use the center of the outer circle T-shaped slot as the reference to process on the left and right sides. The center size is calculated according to the center size of the milling die. Then, rough-process the straight section of the T-shaped slot, and use a corn milling cutter for rough milling, with a single-side allowance of 1mm. If there are no defects, it can be fine-processed to the drawing size. Finally, use the slot processing tool to process the inside of the T-shaped slot in turn, and remove the quantity in turn until the inside of the T-shaped slot is finely processed. Finally, chamfer the inside and outside of the slot. During processing, the processing allowance should be reasonably allocated. Machine tool measurement and laser tracker auxiliary measurement are used during processing to accurately calculate the actual size of each T-shaped slot and ensure the processing accuracy and appearance consistency of each T-shaped slot.

[0012] Step 8. Processing of locating pins between yoke assembly segments. After completing the processing of a set of pole mounting surfaces, process the locating pins between the yoke segments according to the drawing position. When processing the pin holes, first use a drill to process the bottom hole, leaving 1mm on one side, and then use a boring tool to fine bore the pin holes, ensuring that the depth dimension and pin hole dimensions are within the technical requirements of the drawing.

[0013] Step 9. Angle transformation and machining benchmark recheck during the yoke assembly process. After completing the processing of one set of pole mounting surfaces and T-slots, the yoke assembly needs to be transferred to the next set of pole mounting surface processing positions. To this end, the yoke assembly needs to be lifted, turned, dropped and fixed. After dropping, the various data of the inner circular keyway of the yoke assembly need to be checked. Only when they meet the requirements can they be fixed and processed. If there is a deviation, it is necessary to add or subtract adjustment shims on the shim for fine adjustment so that the various data of the inner circular keyway of the yoke assembly meet the technical requirements.

[0014] Step 10. Overall inspection of the yoke assembly. After all the positions of the outer circle of the yoke assembly are processed, the overall processing dimensions of the yoke assembly are fully inspected under the condition that the verticality of the inner keyway is not greater than 0.05mm / m.

[0015] Technical Effects

[0016] Effect 1. The present invention standardizes the processing technology and quality control points of each process link of a single yoke segment to ensure the controllable processing quality of each sequence, and provides technical support for the subsequent processing of the outer cylindrical T-shaped extra-long keyway after the overall stacking of the yoke assembly.

[0017] Effect 2. The present invention optimizes the tools, blades and cutting parameters used in the processing process based on the tool and blade data accumulated through previous technology, which greatly improves the processing efficiency and shortens the production cycle.

[0018] Effect 3. The process method provided by the present invention controls the quality of the rough milling, fine turning, and stacking steps in the early stage, thereby minimizing the processing deformation during the overall processing of the outer cylindrical T-shaped extra-long keyway of the yoke assembly, ensuring the final product quality, avoiding the occurrence of defective products, and ensuring that the product meets the technical requirements.

[0019] Effect 4. The present invention is particularly suitable for the whole process quality control of the processing of the T-shaped extra-long keyway on the outer circle of the rigid yoke of a large-scale pumped-storage power generation motor, and also provides a detailed description of each sub-sequence involved, which is easy to promote and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a yoke segment;

[0021] Figure 2 It is the detailed drawing of T-slot and outer plane;

[0022] Figure 3 This is a schematic diagram of rough machining of the T-slot on the outer circle of the yoke segment by a boring machine;

[0023] Figure 4 This is a schematic diagram of vertical lathe finishing of the inner circle and upper and lower planes of the yoke segment;

[0024] Figure 5 This is a schematic diagram of the finishing of the keyway in a single yoke segment;

[0025] Figure 6 A jig used for stacking the yoke segments as a whole;

[0026] Figure 7 This is a schematic diagram of the completion of stacking the first section of the yoke segment;

[0027] Figure 8 This is a schematic diagram of the complete stacking of all 9 yoke sections;

[0028] Fig. 9 This is a schematic diagram of the milling die installation;

[0029] Fig.10 Schematic diagram of processing the magnetic pole mounting surface and pin holes of the yoke segment;

[0030] Fig.11 This is a schematic diagram of the overall finishing of the T-slot;

[0031] Fig.12 Tools used for machining pole mounting surfaces;

[0032] Fig.13 Tools used for machining T-slot notches;

[0033] Fig.14 A tool used for machining the inside of a T-slot. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the implementation of the present invention will be clearly and completely described below in conjunction with the drawings in the examples of the present invention. Obviously, the described examples are only part of the examples of the present invention, not all of the examples.

[0035] Taking the processing process of the T-shaped extra-long keyway on the outer circle of a rigid yoke of a large pumped storage power generation motor as an example, the process of applying the present invention to process the T-shaped extra-long keyway on the outer circle of the yoke and ensure the technical requirements is explained. The yoke assembly of this project consists of 9 yoke segments with a total weight of 163 tons, a height of 3180mm, and an inner diameter of the yoke segment of The dimension from the pole mounting surface to the center is 2304mm. During the process of yoke assembly of this project, the process scheme and steps of the present invention are fully adopted for production organization. The process is as follows:

[0036] Step 1. Check the machining allowance of the yoke section and the dimension lines required for subsequent machining. Figure 1 As shown in Figure 2, the yoke segment is inspected for size after feeding, and it meets the feeding requirements. According to Figure 2, the machining reference lines around the T-slot of the yoke segment are marked in detail to provide a reference for subsequent rough machining.

[0037] Step 2. Rough machining of the yoke section on a boring machine. Figure 3 As shown. Evenly arrange the shims on the turntable of the CNC boring machine, and make it concentric with the center of the turntable based on the inner circle of the yoke segment. Add adjustment shims between the contact surface of the shims and the yoke segment, and level the stop according to the inner circle of the yoke segment. Press the workpiece, and program the rough machining of the outer circle magnetic pole mounting surface and T-slot of the yoke segment. First, rough mill the outer circle magnetic pole mounting surface of the yoke segment, and leave a 3mm margin to the center size of 2304mm, and process according to 2307mm. Tool reference used in processing Fig.12 ; Then rough-process the T-slot notch area, leaving a 3mm margin on one side, and use the tool reference Fig.13 ; Finally, process the inner area of ​​the T-slot, leaving 3mm machining allowance on each machining surface. The tool used in the process is referenced Fig.14 After processing one set of pole mounting surfaces and T-slots, turn the angle to process the next set of pole mounting surfaces and T-slots. After processing all pole mounting surfaces and T-slots, process the inter-pole empty knife area between the pole mounting surfaces, and process according to the drawing with a margin of 3mm.

[0038] Step 3. Finish the inner circle and upper and lower surfaces of the single yoke segment. Figure 4As shown. After rough milling of the yoke section, it is fine-turned on a vertical lathe to machine the inner circle and the upper and lower planes to the requirements of the drawing. The vertical lathe grinds the pad cylinder, aligns according to the line, fine-turns the inner circle, and fine-turns the side plane and the stopper to the requirements of the drawing. The workpiece is turned over, the pad cylinder is grinded, aligned according to the inner circle, and the upper plane and other positions are fine-turned to the requirements of the drawing. When machining the inner circle, it is important to ensure the consistency of the inner circle size. When machining the upper and lower planes, the parallelism of the upper and lower surfaces must be controlled within the optimal size range to provide an accurate alignment reference for the subsequent process.

[0039] Step 4. Finishing of the keyway and handle hole in the single yoke segment: Figure 5 As shown. Place the yoke segment on a cushion cylinder of equal height on the gantry milling platform, use the inner stop surface of the yoke segment as a reference to find the level, tighten and remeasure after leveling. When machining the inner keyway, perform angle positioning according to the milling die. First, roughly mill the inner keyway of the yoke segment according to the milling die, detect the machining error, and fine-machine the inner keyway when the symmetry and position meet the technical requirements. During machining, it is necessary to repeatedly check the verticality and chord distance of the keyway to eliminate errors in alignment and repeated positioning of the equipment. After all the inner keyways are machined, drill and tap the handle holes on the yoke segment. In this way, the angle consistency between the inner keyway of the yoke segment and the handle hole can be accurately guaranteed, providing a strong guarantee for the subsequent overall stacking position consistency.

[0040] Step 5. Stack the yoke segments as a whole: Figure 6 As shown. On the boring machine platform, determine the placement of the jig. Place the jig according to the steps, connect and debug the oil cylinder. Install the support tool and level it on the tire, the level ≤ 0.02mm / m. First install the first yoke section at the bottom, as shown. Figure 7 As shown. Take the inner circle stop plane of the yoke section as the reference, measure the level of the yoke section, and make the horizontal circumference of the yoke section consistent by adding shims on the shims, and the point difference is within the technical requirements. After the first section is installed and tested, install the second yoke section. The second yoke section is on the upper plane of the first yoke section, and three pairs of locating keys are installed in the corresponding positions of the inner keyway for circumferential positioning. Check each item required in the project as required and record it. After passing the test, install the 3rd to 9th yoke sections in sequence, and conduct inspections and records in time after installing each section. As shown Figure 8As shown. If there are unqualified ones, you can reinstall and adjust the yoke segments to qualified by changing the yoke segment number and other methods. When tightening the positioning key and adjusting the misalignment between segments, you must take into account all slots and adjust them to the best state. During adjustment, use a knife-edge gauge and a feeler gauge to check the circumferential left and right and radial front and back misalignment values ​​of the keyway in each yoke segment. For the slots with tool keys, only use a feeler gauge to check the circumferential clearance between the tool key and the inner keyway, and make a record. Install the remaining 7 segments in this way. After the 9 yoke segments are stacked, install the tool screw and tighten the yoke assembly. The laser tracker detects the radial, circumferential misalignment and verticality of the three inner keyways without tool keys, and measures 2 points for each segment. Lift the oil cylinder, rotate the yoke to 180°, and re-cooperate with the laser tracker to check the yoke's inner keyway and plane data. According to the detection results in two directions, adjust the height of the adjustment gasket under the yoke tray. Re-cooperate with the laser tracker for detection. The circumferential verticality of the keyway in the yoke is required to be no greater than 0.1mm, and the overall deviation of each measuring point is required to be no greater than 0.15mm. Use a knife-edge gauge and a feeler gauge to re-measure the misalignment between each section, which is no greater than 0.03mm.

[0041] Step 6. Install the milling die, adjust the center and fix it. Fig. 9 As shown. Install the milling die, use the laser tracker to check and adjust the coaxiality of the milling die and the yoke assembly to no more than 0.03mm, the symmetry of the inner keyway to no more than 0.1mm, and the level of the milling die to no more than 0.1mm. After passing the test, install the tool to tighten the screw and tighten it according to the requirements of the drawing. After tightening the screw, use the laser tracker to re-measure the milling die data.

[0042] Step 7. Machining of the outer circle of the yoke section T-shaped extra-long keyway. Machining of the pole mounting surface area according to the milling die, a total of 14 groups. The machining range includes the pole mounting surface, T-shaped slot, and inter-pole empty knife. The specific location is as follows Figure 2 As shown. Firstly, rough-process the pole mounting surface, select an octagonal cutter head, and process the pole mounting surface on both sides with the center of the T-slot as the reference. Fig.12 As shown. The center dimension is calculated according to the center dimension of the milling die. Secondly, rough-mill the straight section of the T-slot mouth with a corn milling cutter, with a single-side allowance of 1mm. Fig.13 Then use the tool to process the inside of the T-slot to remove the quantity, as shown in the figure. Fig.14 As shown. Finally, the whole process is completed with a fine milling cutter. After the internal finishing of the T-slot is completed, the inner and outer chamfers of the slot are performed. During processing, the processing allowance is reasonably allocated to each processing area. During processing, machine tool measurement and laser tracker auxiliary measurement are used to accurately measure and calculate the actual size of each keyway, and to ensure the processing accuracy and appearance consistency of each T-type.

[0043] Step 8. Processing of locating pins between yoke assembly segments. After completing the processing of a set of pole mounting surfaces, process the locating pins between the yoke segments according to the drawing position. When processing the pin holes, first use a drill to process the bottom hole, leaving a 1mm margin on one side, and then use a boring tool to fine bore the pin holes. Ensure that the depth dimension and the pin hole dimension are within the technical requirements of the drawing. Processing the pin holes is to prevent the subsequent yoke assembly from misaligning the segments when turning the angle and to increase the positioning strength between the segments, eliminating the micro-misalignment caused by vibration in the remaining positions of the subsequent yoke assembly.

[0044] Step 9. Angle transformation and machining benchmark recheck during the yoke segment machining process. After completing the machining of one set of pole mounting surfaces and T-slots, the yoke assembly needs to be transferred as a whole to the next set of pole mounting surfaces and T-slot machining positions. To this end, the yoke assembly needs to be lifted up, turned, dropped and fixed. After dropping, the various data of the inner circular keyway of the yoke assembly need to be checked. Only when they meet the requirements can they be fixed and machined. If there is a deviation, it is necessary to add or subtract adjustment shims on the shim for fine adjustment so that the various data of the inner circular keyway of the yoke assembly meet the technical requirements.

[0045] Step 10. Overall inspection of the yoke assembly. After all the positions of the outer circle of the yoke assembly are processed, the overall processing dimensions of the yoke are fully inspected under the condition that the verticality of the inner keyway is not greater than 0.05mm / m. After all the test data are qualified, mark and disassemble.

[0046] The processing method of the present invention can ensure that the roundness of the inner and outer circles and the position of the inner keyway of the yoke segment are within the technical requirements of the drawing. During the overall processing after the 9 yoke segments are stacked, the processing quality of the T-shaped extra-long keyway on the outer circle of the yoke is fully in line with the technical requirements through standardized processing and detection steps, optimized processing tools, standardized tool processing parameters and other measures. The overall consistency of the size and quality stability of the yoke components of the generator motor of the pumped storage unit are greatly improved.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for processing and assembling a rigid magnetic yoke of a rotor of a large pumped storage generator set, characterized by: Step 1. Check the machining allowance of the yoke segment and the dimension lines required for subsequent machining, and mark the T-slot machining reference lines of the yoke segment in detail to provide a reference for subsequent rough machining; Step 2. Rough milling of the pole mounting surface of a single yoke segment. Evenly arrange shims on the turntable of the CNC boring and milling machine, aligning them with the center of the turntable using the inner circle of the yoke segment as a reference. Add adjustment shims between the contact surface of the shims and the yoke segment, and level them according to the rough machining stop of the inner circle of the yoke segment. Press the workpiece tightly and program the rough machining of the pole mounting surface and T-slot of the outer circle of the yoke segment. Remove the excess through rough machining to ensure the stability of subsequent fine machining. Step 3. Finish machining the inner circle and upper and lower surfaces of the single yoke segment. After rough milling, the yoke segment is fine-turned on a vertical lathe to machine the inner circle and upper and lower surfaces to the drawing requirements. When machining the inner circle, the consistency of the inner circle dimensions must be ensured. When machining the upper and lower surfaces, the parallelism of the upper and lower surfaces must be controlled within the optimal size range to provide an accurate alignment reference for subsequent alignment. Step 4. Finish machining the inner keyway and handle hole of the single yoke segment. Finish machining the inner keyway of the single yoke segment is performed on a gantry milling machine. A milling die is used to locate the angle of the inner keyway during machining to ensure that the keyway positions of the nine yoke segments for the same project are consistent. The handle hole is also machined while machining the inner keyway of the single yoke segment on the gantry milling machine. Step 5. Assemble the yoke segments into a yoke assembly; on the boring machine platform, place the yoke assembly support tool and the jacking jig in an appropriate position, and install the oil cylinder, shim and tray; first install the first yoke segment at the bottom, and use the inner circle stop plane of the yoke segment as the reference to measure the level of the yoke segment. By adding shims to the shims, the horizontal circumferential direction of the yoke segments is consistent, and the point difference is within the technical requirements; after the first yoke segment is installed and tested, install the second yoke segment; the second yoke segment is placed on the upper plane of the first yoke segment, and circumferential positioning is performed by installing three pairs of locating keys at the corresponding positions of the inner keyway; check the required items as required and record them; after passing the inspection, install the 3rd to 9th yoke segments in sequence, and promptly inspect and record them after each segment is installed; the assembly of the 9 yoke segments into one is called a yoke assembly; Step 6. Install the milling die, adjust the concentricity, and secure it. Install the milling die flat on the top yoke segment. Use a laser tracker to check and adjust the inner circle of the milling die to be concentric with the inner circle of the yoke assembly. Check the symmetry of the inner keyway and the level of the milling die. Once qualified, install the tool to tighten the screw and tighten it according to the torque required by the drawing. After tightening the screw, use the laser tracker to re-measure the milling die data. Step 7. Overall processing of the outer circle T-shaped extra-long keyway of the yoke segment; first rough-process the pole mounting surface and the inter-pole empty knife area; select an octagonal cutter head, use the outer circle T-slot center as the reference, and process on the left and right sides; the center size is calculated according to the center size of the milling die; then, rough-process the straight section of the T-slot, use a corn milling cutter for rough milling, and the single-side allowance is 1mm. If there is no defect, it can be fine-processed to the drawing size; finally, use the slot processing tool to process the inside of the T-slot in turn, and remove the amount in turn until the inside of the T-slot is fine-processed; finally, chamfer the inside and outside of the slot; during processing, the processing allowance should be reasonably allocated; during processing, machine tool measurement and laser tracker auxiliary measurement are used to accurately calculate the actual size of each T-slot and ensure the processing accuracy and appearance consistency of each T-slot; Step 8. Processing of locating pins between yoke assembly segments: After completing the processing of a set of pole mounting surfaces, process the locating pins between the yoke segments according to the positions in the drawing; when processing the pin holes, first use a drill to process the bottom hole, leaving a 1mm allowance on one side, and then use a boring tool to perform fine boring of the pin holes; Step 9. Angle transformation and machining benchmark recheck during the yoke assembly process; After completing the machining of one set of pole mounting surfaces and T-slots, the yoke assembly needs to be moved to the machining position of the next set of pole mounting surfaces. The yoke assembly is lifted, rotated, lowered, and fixed; after lowering, the various data of the inner circular keyway of the yoke assembly need to be checked. Only when they meet the requirements can they be fixed and processed; If there is any deviation, it is necessary to add or remove shims on the shims for fine adjustment so that the data of the inner keyway of the yoke assembly meet the technical requirements; Step 10. Overall inspection of the yoke assembly: After all positions of the outer circle of the yoke assembly are processed, the overall processing dimensions of the yoke assembly are fully inspected under the condition that the verticality of the inner keyway is not greater than 0.05mm / m.

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