Axial connection datamation repairing method for frame of revolving body

Abstract

The invention belongs to the technical field of precision assembly, and discloses an axial connection datamation repair method for a frame of a rotary body, which comprises the following steps of: (1) constructing a coordinate system of a high-precision measuring device; (2) confirming and measuring the assembling repeatability of the high-precision bearing shaft; (3) measuring the distance between the shaft back and the end surface under the establishment of a second-order coordinate; (4) measuring the distance between the shaft back fitting end surfaces under the establishment of a second-order coordinate system; (5) directional quantitative end face parameterization repair compensation; and (6) determining a repair result. According to the method, through high-precision measurement and repair, the clearance error of the frame in the axial assembling process can be remarkably reduced, and the assembling precision is ensured. According to the method, through multiple disassembly and assembly tests and measurement data comparison, it is ensured that the bearing shaft assembly repeatability meets the assembly requirement, and the assembly consistency is enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of precision assembly, and in particular is a method for digitally repairing the axial connection of a frame of a rotating body. Background Art

[0002] The accuracy and stability of the rotating body, an important bearing component of precision instruments, are directly determined by the reasonableness of its process design. In modern manufacturing, especially in the field of high-end equipment manufacturing, the high-precision axial assembly of the rotating body assembly is a key link to ensure the performance of the whole machine. In the shaft system assembly, to control the reliability of the shaft system assembly, it is necessary to make the two fit closely and ensure the fitting gap. If there is an assembly gap error, it will affect the smoothness of the frame during the full posture rotation process.

[0003] In the actual assembly process, the rotating body assembly is composed of two or more frame assemblies. The traditional assembly method is often performed manually by the assemblers. It is difficult to ensure the accuracy and consistency of the assembly by relying on manual experience and manual operation. The current highest assembly accuracy can only reach 0.02mm, which is increasingly difficult to meet the high-precision requirements in the assembly process. In addition, for the rotating body assembly with complex structure, the traditional assembly method is often difficult to achieve high-precision axial positioning and adjustment.

[0004] Therefore, a new data-based repair method is urgently needed to solve this problem and improve assembly efficiency and accuracy. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for digitally repairing the axial connection of the frame of a rotating body.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for digitally repairing the axial connection of a frame of a rotating body, comprising the following steps:

[0008] (1) Coordinate system construction of high-precision measurement equipment

[0009] Use high-precision three-coordinate measuring equipment, referred to as three-coordinate, to place the frame used to assemble the rotating assembly in the direction of the axis of the three-coordinate, ensuring that the line connecting the A and B holes of the frame is relatively parallel to the X axis of the three-coordinate, and the line connecting the C and D holes is relatively parallel to the Y axis of the three-coordinate;

[0010] After the assembly of the bearing, bearing pressure plate and bearing shaft is completed, the star-shaped measuring needle of the three-coordinate system is used to manually measure the four inner holes of the frame. Each hole has 4 measuring points, and circles A, B, C and D are obtained. The line connecting circles A and B is set as line 1, the line connecting circles C and D is set as line 2, and the intersection point of the two lines is set as P1. Under the existing elements, coordinate system 1 is established;

[0011] Based on coordinate system 1, use parameter programming to automatically measure, and again use three-coordinate automatic measurement to measure the four inner holes of the frame. The measured cut circle is the hole center. The number of measurement points for a single cut circle is 8, and circles A1, B1, C1, and D1 are obtained. The line connecting circles A1 and B1 is set as line X, and the line connecting circles C1 and D1 is set as line Y, as shown in the following example: Figure 1 As shown, evaluate the verticality and position of the X and Y lines;

[0012] (2) High-precision bearing shaft assembly repeatability confirmation measurement

[0013] The bearings, bearing pressure plates and shafts were disassembled and tested multiple times. Based on the three-dimensional coordinates, high-precision calibration was performed before measurement. After the calibration, the verticality and position of the assembled frame were measured. When the measured verticality and position were less than 0.005mm, it was confirmed that the frame assembly met the use requirements. The bearings, bearing pressure plates and bearing shafts were removed, left to stand for more than 3 hours, and reassembled. The XY axis parameters were measured through the above steps, and the data were recorded and compared. When the difference between the two measured verticality and position values ​​was less than 0.001mm, it was confirmed that the bearing shaft assembly repeatability met the assembly requirements.

[0014] (3) Measurement of the distance between the shaft and the back end faces under the establishment of second-order coordinates

[0015] On the premise of confirming that the bearing shaft assembly repeatability meets the assembly requirements, establish a second-order measurement coordinate system, intersect the measured X and Y lines, obtain the origin D, and establish coordinate system 2;

[0016] Before measurement, rotate the two shaft backs to the position for use when they are assembled with the internal frame. Under the condition of coordinate system 2, evenly collect eight measurement points on the cut circle with radius R and the hole center as the origin on the end faces of the two shaft backs. The two groups of measurement points are in a one-to-one correspondence. The connecting line of the relative position measurement points is parallel to the axis of the coordinate system. The recording points of the shaft back at the A end are marked as P1, P2, P3, P4, P5, P6, P7, P8, and the recording points of the shaft back at the B end are marked as P1', P2', P3', P4', P5', P6', P7' and P8'.

[0017] According to the principle of equal division of the measured area, the calculation formula of radius R value is:

[0018]

[0019] Where: R 中 is the cross-sectional radius of the sampling point; R is the maximum contact circle radius of the contact surface; r is the minimum contact circle radius of the contact surface.

[0020] Recording of measurement data:

[0021]

[0022]

[0023] (4) Measurement of the distance between the shaft and the back end faces under the second-order coordinate system

[0024] Under the same conditions, the internal frame is placed on the three-coordinate measuring platform. Based on the four inner holes of the frame, the first-order and second-order coordinate systems are established. Eight measuring points are evenly collected on the Φ45 diameter section circle with the hole center as the origin of the two shaft back-bonded end faces. The two groups of measuring points are in a one-to-one correspondence. The connecting line of the relative position measuring points is parallel to the axis of the coordinate system. The recording points of the A-end bonding end face are marked as P11, P12, P13, P14, P15, P16, P17, and P18, and the recording points of the B-end bonding end face are marked as P11', P12', P13', P14', P15', P16', P17', and P18'.

[0025] Recording of measurement data:

[0026]

[0027]

[0028] (5) Directional quantitative end face parametric repair and compensation

[0029] Complete data collection and perform quantitative data calculation before repair:

[0030] Relative position deviation value U1 of the sampling point on the back end of the shaft at end A i for:

[0031]

[0032] Relative position deviation value U2 of the sampling point on the back end of the shaft at the B end i for:

[0033]

[0034] Relative position deviation value of the sampling point of the end face of the shaft back at the A end U3 i for:

[0035]

[0036] Relative position deviation value of the sampling point of the B-end shaft back fitting end surface U4 i for:

[0037]

[0038] After determining the relative position deviation value of each point on each end face, the repair reference point and the required repair allowance are obtained through statistical calculation based on the one-to-one correspondence:

[0039] S i =Max(U1 i +U2 i -U3 i -U4 i )

[0040] Where: i represents the position of the reference repair point; S i The clearance of the reference repair point;

[0041] According to the calculation results, the two end surfaces after bonding are firstly fine-tuned in parallel to ensure that the effective bonding area between the end surfaces reaches more than 90%. The fine-tuning dimension data is calculated as follows;

[0042] D 修 =(D 基准 -D i )+(d 基准 -d i )

[0043] D' 修 =(D' 基准 -D' i )+(d' 基准 -d' i )

[0044] Where: D' 修 , D 修 The required grinding size; d 基准 , D 基准 The measured distance of the determined benchmark repair point;

[0045] d i , D i The measured distance of each measuring position point;

[0046] When the D repair value is a positive number, the frame end face is repaired according to the value. When the D repair value is 0 or a negative number, the end face is not repaired and the original state is maintained. The qualitative correction of the internal frame fitting surface can be completed according to the data. After the repair is completed, step (4) is executed to record the data of each measurement point again.

[0047] After completing the parallelism repair, the clearance adjustment will be carried out;

[0048] When repairing, first determine the main repair direction. The direction determination formula is as follows:

[0049] H=(D 基 -d 基 )-(D' 基 -d' 基 )

[0050] Where: H is the eccentric distance between the two midlines; D 基 d 基 , D' 基 , d' 基 These are the distance measurements of the reference points in turn;

[0051] When the H value is positive, the main repair direction is the fitting surface of the internal frame end A. When the H value is negative, the main repair direction is the fitting surface of the internal frame end B. The other end is the matching repair situation. The two are repaired in conjunction to ensure that the H value reaches 0.

[0052] Then determine the repair size according to the single-sided calculation formula as follows:

[0053] MA=D 基 -d 基 -2*C

[0054] MB=D' 基 -d' 基 -2*C

[0055] Where: MA is the required repair value of the fitting surface at the A end of the internal frame; MB is the required repair value of the fitting surface at the B end of the internal frame; C is the single-side gap parameter between frames;

[0056] Based on the reference frame matching single-side clearance table, the required repair value can be calculated:

[0057] Distance between two end faces of internal shaft system Target single-side clearance value (C) 100mm~250mm 0.01mm 250mm~450mm 0.015mm 450mm or more 0.025mm

[0058] (6) Determine the repair results

[0059] According to the calculated repair values, on the basis of ensuring the completion of parallelism, the overall excess of the double end faces is removed to achieve high-precision matching of the mating end faces.

[0060] Furthermore, the measurement accuracy of the high-precision three-coordinate measuring device is (0.6+L / 600) mm.

[0061] Furthermore, the method further comprises the following steps:

[0062] (7) End surface grinding monitoring

[0063] Continuously monitor the research framework until the target parameters are reached. The research process includes parallel research and quantity research.

[0064] (8) Retest after study

[0065] With digital reference after precise measurement, qualitative and quantitative end surface repair can be achieved.

[0066] (9) Re-measure the distance after the repair

[0067] After grinding, it is necessary to proceed to step (5) to precisely measure the distance results after grinding. When the gap and parallelism meet the requirements, the frame grinding is completed.

[0068] Furthermore, in the step (7), the end face grinding monitoring is performed using an end face grinding monitoring device, the end face grinding monitoring device comprising a pedestal, a support device, a mandrel, a lever gauge and a limit column, the lever gauge is a lever gauge provided with a universal seat, and the frame to be ground is detachably connected to the end face grinding monitoring device;

[0069] The support device and the limit column are both connected to the pedestal, and the mandrel and the lever indicator can be detachably connected to the support device;

[0070] The pedestal is arranged in the horizontal direction, and a plurality of limit columns are connected to the upper part of the horizontal side of the pedestal, and the plurality of limit columns are arranged at intervals. The frame to be repaired can be engaged with the upper surface of the pedestal detachably arranged in the plurality of limit columns, and the frame to be repaired is detachably connected to the limit columns, and the limit columns can perform a limit operation on the frame to be repaired;

[0071] The support device is arranged in the vertical direction, and the support device includes a fixing seat, a nut, a bolt, a support rod, a connecting through hole, a threaded hole and a screw. The support rod is arranged in the vertical direction, and a connecting through hole is coaxially formed in the upper part of the support rod. The connecting through hole is arranged in the horizontal direction. The frame to be repaired includes an inner hole of the frame. The connecting through hole and the inner hole of the frame are arranged opposite to each other in the horizontal direction and are extended from one horizontal side of the support rod to the other horizontal side and pass through the other horizontal side of the support rod. The connecting through hole is matched with the core shaft, and the core shaft can be detachably arranged coaxially with the connecting through hole.

[0072] The threaded hole is arranged in the vertical direction, the threaded hole extends downward from the top of the support rod, and the bottom of the threaded hole is connected to the connecting through hole, and the screw and the threaded hole can be threadedly engaged and installed together by screwing;

[0073] The bottom of the support rod is detachably connected to the fixing seat through nuts and bolts, and the angle between the support rod and the fixing seat can be adjusted through nuts and bolts; the fixing seat is connected and set on the pedestal;

[0074] The core shaft is arranged in the horizontal direction, and the core shaft can be coaxially detachably connected and arranged between the frame inner hole and the connecting through hole of the frame to be repaired. The lever meter can also be detachably connected and arranged between the frame inner hole and the connecting through hole of the frame to be repaired.

[0075] Furthermore, the method for using the end surface grinding monitoring device comprises the following steps:

[0076] (1) Install a number of limit columns on the pedestal according to the shape of the frame, so that the frame placed on the pedestal is not easily displaced during repair, and then install the frame in the area surrounded by the upper limit columns on the pedestal;

[0077] (2) The support device is connected to the pedestal, and the core shaft is coaxially connected and placed between the connecting through hole of the support device and the inner hole of the frame. The screw is screwed down to fix the core shaft so that the core shaft is fixed and cannot move. Then, the support rod is fixed by bolts and nuts so that it cannot move;

[0078] (3) Then, turn the screw upward to loosen the core shaft, remove the core shaft, pass the lever gauge through the connecting hole of the supporting device and connect it to the inner hole of the frame, and use the universal seat fine-tuning part to make the lever gauge eat half a circle.

[0079] (4) Loosen the screw to ensure that the lever gauge can rotate freely, rotate the lever gauge head to the reference point, and tighten the screw again; adjust the display needle to the 0 o'clock position through fine adjustment; loosen the screw, rotate the lever gauge clockwise with the axis of the connecting through hole of the support device as the center, and record the relative distances of the remaining 7 points after grinding relative to the reference point;

[0080] (5) Continuously monitor and study until the target parameters are reached, that is, the target parameters are the MA and MB values.

[0081] The advantages and positive effects achieved by the present invention are:

[0082] 1. The method of the present invention can significantly reduce the clearance error of the frame during the axial assembly process and ensure assembly accuracy through high-precision measurement and repair. The method ensures that the assembly repeatability of the bearing shaft meets the assembly requirements and enhances the consistency of assembly through multiple disassembly and assembly tests and measurement data comparison. The method adopts a digitized repair method to obtain the repair reference point and the required repair allowance through measurement and calculation, thereby realizing a repair method that combines qualitative and quantitative methods. Through high-precision measurement and repair, the assembly process is simplified, the dependence on manual experience and manual operation is reduced, and the assembly efficiency is improved. The method ensures the smooth operation of the various parts of the rotating body assembly in the whole machine by realizing high-precision axial assembly, thereby ensuring the performance and stability of the whole machine. The inventive method is not only suitable for specific rotating body assemblies, but can also be widely used in various rotating body assemblies that require high-precision axial assembly.

[0083] 2. The method of the present invention can ensure that the various parts of the rotating body assembly can achieve extremely high precision during axial assembly. By using the end surface grinding device, it can be ensured that the end surface of the rotating body assembly reaches extremely high flatness and finish. This not only improves the overall performance of the equipment, but also extends the service life of the equipment. At the same time, due to the improved assembly accuracy, the operating stability and reliability of the equipment are also significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Figure 1 Constructing a diagram for the assembly coordinate system of the present invention;

[0085] Figure 2 This is a point sampling diagram of the shaft back end surface of the method of the present invention;

[0086] Figure 3 This is a measurement diagram of the shaft back end surface spacing under the second-order coordinate of the present invention;

[0087] Figure 4 A three-dimensional schematic diagram of the structural connection of the end surface grinding device of the present invention (the supporting device is omitted);

[0088] Figure 5 A three-dimensional schematic diagram of a structural connection of the end surface grinding device of the present invention (the core shaft is coaxially detachably connected and arranged between the inner hole of the frame to be ground and the connecting through hole);

[0089] Figure 6 A three-dimensional schematic diagram of the structural connection of the end surface grinding device of the present invention (the lever gauge is detachably connected and arranged between the inner hole of the frame to be ground and the connecting through hole);

[0090] Figure 7 A right side schematic diagram of the structural connection of the support device of the end surface grinding device of the present invention;

[0091] Figure 8 for Figure 7 Schematic diagram of the structural connection section. DETAILED DESCRIPTION

[0092] The present invention will be further described in detail below in conjunction with specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0093] The raw materials used in the present invention, unless otherwise specified, are conventional commercial products, the methods used in the present invention, unless otherwise specified, are conventional methods in the art, and the quality of each substance used in the present invention is conventional quality. The structures, connection relationships, etc. not described in detail in the present invention can be understood as conventional technical means in the art.

[0094] A method for digitally repairing the axial connection of a frame of a rotating body, comprising the following steps:

[0095] (1) Coordinate system construction of high-precision measurement equipment

[0096] Use high-precision three-coordinate measuring equipment (hereinafter referred to as three-coordinate), place the frame used to assemble the rotating body assembly (the rotating body assembly is composed of two or more frames) axially according to the axis direction of the three-coordinate, and ensure that the A hole and B hole of the frame (generally the frame has one or two pairs of axial holes, the A hole and the B hole are relative axial holes, and the two pairs of axial hole frames also have C holes and D holes. The line connecting the A hole and the B hole is perpendicular to the line connecting the C hole and the D hole. The instruction manual is attached Figure 1 The inner frame is a two-hole frame, and the outer frame is a four-hole frame. The line connecting the C and D holes is relatively parallel to the X axis of the three-coordinate system, and the line connecting the C and D holes is relatively parallel to the Y axis of the three-coordinate system;

[0097] After the assembly work is completed, the bearing, bearing pressure plate and bearing shaft (these three parts are assembled and installed on the shaft hole of the frame itself to form a new shaft hole. This assembly mainly realizes the connection and synchronous rotation with the internal frame. The relevant connection relationship is well known in the art and can be operated according to the conventional method.) are assembled, and the four inner holes of the frame are manually measured using a three-coordinate star probe (that is, four points on the inner wall of the shaft hole can be manually taken using a three-coordinate corresponding probe to fit a circle and obtain a center of the circle.), the number of measurement points for each hole is 4, and circles A, B, C and D are obtained. The line connecting circles A and B is set as line 1, the line connecting circles C and D is set as line 2, and the intersection point of the two lines is set as P1. Under the existing elements, coordinate system 1 is established;

[0098] Based on coordinate system 1, use parameter programming to automatically measure, and again measure the four inner holes (i.e., shaft holes) of the frame using three-coordinate automatic measurement. The measured cut circle is the hole center, and the number of measurement points for a single cut circle is 8. Circles A1, B1, C1, and D1 are obtained. The line connecting circles A1 and B1 is set as line X, and the line connecting circles C1 and D1 is set as line Y, as shown in the following example: Figure 1 As shown, evaluate the verticality and position of the X and Y lines.

[0099] (2) High-precision bearing shaft assembly repeatability confirmation measurement

[0100] The bearings, bearing pressure plates and shafts were disassembled and tested multiple times. Based on the three-dimensional coordinates, high-precision calibration was performed before measurement. After the calibration, the verticality and position of the assembled frame were measured. When the measured verticality and position were less than 0.005mm, it was confirmed that the frame assembly met the use requirements. The bearings, bearing pressure plates and bearing shafts were removed, left to stand for more than 3 hours, and reassembled. The XY axis parameters were measured through the above steps, and the data were recorded and compared. When the difference in the verticality and position values ​​measured twice was less than 0.001mm, it was confirmed that the bearing shaft assembly repeatability met the assembly requirements.

[0101] (3) Measurement of the distance between the shaft and the back end faces under the establishment of second-order coordinates

[0102] On the premise of confirming that the bearing shaft assembly repeatability meets the assembly requirements, establish a second-order measurement coordinate system, intersect the measured X and Y lines, obtain the origin D, and establish coordinate system 2;

[0103] Before measurement, the two shaft backs (which are fastened to the internal frame and are well known) are rotated to the position for use when they are assembled with the internal frame. Under the condition of coordinate system 2, eight measurement points are evenly collected on the cross-section circle with the center of the hole as the origin and the radius R on the end faces of the two shaft backs (measurement indicators are shown in Table 1). The point map is shown in Figure 2 The two groups of measurement points are in one-to-one correspondence. The line connecting the relative position measurement points is parallel to the axis of the coordinate system. The back-axis recording points at the A end are marked as P1, P2, P3, P4, P5, P6, P7, and P8, and the back-axis recording points at the B end are marked as P1', P2', P3', P4', P5', P6', P7', and P8'. Figure 2 and Figure 3 As shown;

[0104] According to the principle of equal division of the measured area, the calculation formula of radius R value is:

[0105]

[0106] Where: R 中 is the cross-sectional radius of the sampling point; R is the maximum contact circle radius of the contact surface; r is the minimum contact circle radius of the contact surface.

[0107] Record the measured data and record it in the statistical table 1:

[0108] Table 1 Measurement point coordinate position data values

[0109]

[0110]

[0111] (4) Measurement of the distance between the shaft and the back end faces under the second-order coordinate system

[0112] Under the same conditions, the internal frame is placed on the three-coordinate measuring platform. Based on the four inner holes of the frame, the first-order and second-order coordinate systems are established. Eight measurement points are evenly collected on the Φ45 diameter section circle with the hole center as the origin by fitting the end faces of the two axes (see Table 2). The point map is shown in Figure 2The two groups of measurement points are in one-to-one correspondence. The line connecting the relative position measurement points is parallel to the axis of the coordinate system. The A-end bonding end surface recording points are marked as P11, P12, P13, P14, P15, P16, P17, and P18, and the B-end bonding end surface recording points are marked as P11', P12', P13', P14', P15', P16', P17', and P18', see Figure 2 .

[0113] Record the measured data and record it in the statistical table 2:

[0114] Table 2 Measurement point coordinate position data values

[0115]

[0116] (5) Directional quantitative end face parametric repair and compensation

[0117] Complete data collection and perform quantitative data calculation before repair:

[0118] Relative position deviation value U1 of the sampling point on the back end of the shaft at end A i for:

[0119]

[0120] Relative position deviation value U2 of the sampling point on the back end of the shaft at the B end i for:

[0121]

[0122] Relative position deviation value of the sampling point of the end face of the shaft back at the A end U3 i for:

[0123]

[0124] Relative position deviation value of the sampling point of the B-end shaft back fitting end surface U4 i for:

[0125]

[0126] After determining the relative position deviation value of each point on each end face, the repair reference point and the required repair allowance are obtained through statistical calculation based on the one-to-one correspondence:

[0127] S i =Max(U1 i +U2 i -U3 i -U4 i )

[0128] Where: i represents the position of the reference repair point; S i The clearance of the reference repair point;

[0129] Based on the calculation results, the two end faces after bonding are firstly fine-tuned in parallel to ensure that the effective bonding area between the end faces reaches more than 90%. The fine-tuning dimension data is calculated as follows;

[0130] D 修 =(D 基准 -D i )+(d 基准 -d i )

[0131] D' 修 =(D' 基准 -D' i )+(d' 基准 -d' i )

[0132] Where: D' 修 , D 修 The required grinding size; d 基准 , D 基准 The measured distance of the determined benchmark repair point;

[0133] d i , D i is the measured distance of each measuring position point (the actual meaning of D and d is shown in Record Tables 1 and 2);

[0134] When the D repair value is a positive number, the frame end face is repaired (internal frame end face fitting surface) according to the value. When the D repair value is 0 or a negative number, the end face is not repaired and the original state is maintained. The qualitative correction of the internal frame fitting surface can be completed based on the data. After the repair is completed, execute step (4) and record the data of each measurement point again.

[0135] After completing the parallelism repair, the clearance adjustment will be carried out;

[0136] When repairing, first determine the main repair direction. The direction determination formula is as follows:

[0137] H=(D 基 -d 基 )-(D' 基 -d' 基 )

[0138] Where: H is the eccentric distance between the two midlines; D 基 ,d 基 , D' 基 , d' 基These are the distance measurement values ​​of the reference points (see Record Table 1 and Record Table 2 for the values. The reference point i is known through Si, i can be any point from 1 to 8, and then the default values ​​are D basis, d basis, D' basis and d' basis. If the reference point i is determined to be 6, the values ​​of the above four points are D6, d6, D'6 and d'6 in the record table.);

[0139] When the H value is a positive number, the main repair direction is the fitting surface of the internal frame end A. When the H value is a negative number, the main repair direction is the fitting surface of the internal frame end B. The other end is the matching repair situation. The two are repaired in conjunction to ensure that the H value reaches 0.

[0140] Then determine the repair size according to the single-sided calculation formula as follows:

[0141] MA=D 基 -d 基 -2*C

[0142] MB=D' 基 -d' 基 -2*C

[0143] Where: MA is the required repair value of the fitting surface at the A end of the internal frame; MB is the required repair value of the fitting surface at the B end of the internal frame; C is the single-side gap parameter between frames;

[0144] Based on the reference frame fit single-side clearance table, the required repair quantity can be calculated.

[0145] Distance between two end faces of internal shaft system Target single-side clearance value (C) 100mm~250mm 0.01mm 250mm~450mm 0.015mm 450mm or more 0.025mm

[0146] (6) Determine the repair results

[0147] According to the calculated repair values, on the basis of ensuring the completion of parallelism, the overall excess of the double end faces is removed to achieve high-precision matching of the mating end faces.

[0148] The method of the present invention improves assembly efficiency and one-time success rate, and improves the previous multiple manual assembly perception and experimental research and development of the end face to digital one-time quantitative research and development, thereby increasing the controllability of the gap between each end face and reducing manual operation errors and the number of manual repairs.

[0149] The method of the present invention can significantly reduce the clearance error of the rotating body assembly during the axial assembly process and ensure the assembly accuracy through high-precision measurement and repair. The method ensures that the assembly repeatability of the bearing shaft meets the assembly requirements and enhances the consistency of the assembly through multiple disassembly and assembly tests and measurement data comparison. The method adopts a digitized repair method to obtain the repair reference point and the required repair allowance through measurement and calculation, thereby realizing a repair method that combines qualitative and quantitative methods. Through high-precision measurement and repair, the assembly process is simplified, the dependence on manual experience and manual operation is reduced, and the assembly efficiency is improved. The method ensures the smooth operation of the rotating body assembly in the whole machine by realizing high-precision axial assembly, thereby ensuring the performance and stability of the whole machine. The method of the invention is not only suitable for specific rotating body assemblies, but can also be widely used in various rotating body assemblies that require high-precision axial assembly.

[0150] In this embodiment, the high-precision three-coordinate measuring equipment has a three-coordinate measuring accuracy of (0.6+L / 600) mm, thereby improving the repair accuracy.

[0151] In this embodiment, the method further includes the following steps:

[0152] (7) End surface grinding monitoring

[0153] Continuously monitor the research framework until the target parameters are reached. The research process includes parallel research and quantity research.

[0154] (8) Retest after study

[0155] With digital reference after precise measurement, qualitative and quantitative end surface repair can be achieved.

[0156] (9) Re-precision measurement of distance results after grinding

[0157] After grinding, it is necessary to proceed to step (5) to precisely measure the distance results after grinding. When the gap and parallelism meet the requirements, the frame grinding is completed.

[0158] Preferably, in step (7), the end face grinding monitoring device is used to monitor the end face grinding, such as Figures 4 to 8 As shown, the end surface grinding monitoring device includes a pedestal 1, a support device 2, a mandrel 3, a lever gauge 4 and a limit column 5, the lever gauge is a lever gauge provided with a universal seat, and the frame to be ground 6 is detachably connected to the end surface grinding monitoring device;

[0159] The support device and the limit column are both connected to the pedestal, and the mandrel and the lever indicator can be detachably connected to the support device;

[0160] The pedestal is arranged in the horizontal direction, and a plurality of limit columns are connected to the upper part of one horizontal side of the pedestal, and the plurality of limit columns are arranged at intervals. The frame to be repaired can be engaged with the upper surface of the pedestal detachably arranged in the plurality of limit columns, and the frame to be repaired is detachably connected to the limit columns, and the limit columns can perform a limit operation on the frame to be repaired, so as to avoid the position shift of the frame to be repaired during processing, thereby affecting the detection result;

[0161] The support device is arranged in the vertical direction, and the support device includes a fixing seat 11, a nut 12, a bolt 13, a support rod 14, a connecting through hole 21, a threaded hole 22 and a screw 23. The support rod is arranged in the vertical direction, and a connecting through hole is coaxially formed in the upper part of the support rod. The connecting through hole is arranged in the horizontal direction. The frame to be repaired includes a frame inner hole 61. The connecting through hole and the frame inner hole are arranged opposite to each other in the horizontal direction and are extended from one horizontal side of the support rod to the other horizontal side and pass through the other horizontal side of the support rod. The connecting through hole is matched with the core shaft, and the core shaft can be detachably arranged coaxially with the connecting through hole.

[0162] The threaded hole is arranged in the vertical direction, the threaded hole extends downward from the top of the support rod, and the bottom of the threaded hole is connected to the connecting through hole. The screw and the threaded hole can be threadedly engaged and installed together. The screw can loosen or tighten the core shaft set in the connecting through hole, which is convenient for subsequent operations.

[0163] The bottom of the support rod is detachably connected to the fixing seat through nuts and bolts. The support rod can adjust the angle between the support rod and the fixing seat through nuts and bolts, thereby meeting different usage requirements and expanding the scope of use; the fixing seat is connected and set on the pedestal;

[0164] The core shaft is arranged in the horizontal direction, and the core shaft can be coaxially detachably connected and arranged between the frame inner hole and the connecting through hole of the frame to be repaired. The lever meter can also be detachably connected and arranged between the frame inner hole and the connecting through hole of the frame to be repaired.

[0165] The method for using the end surface grinding monitoring device is as follows:

[0166] (1) Install several limit columns (such as nails) on the pedestal according to the shape of the frame, so that the frame placed on the pedestal is not easily displaced during repair, and then install the frame in the area surrounded by the upper limit columns on the pedestal;

[0167] (2) The support device is connected to the pedestal, and the core shaft is coaxially connected and placed between the connecting through hole of the support device and the inner hole of the frame. The screw is screwed downward to fix the core shaft so that the core shaft is fixed and cannot move. Then, the support rod is fixed by bolts and nuts so that it cannot move.

[0168] (3) Then, turn the screw upward to loosen the core shaft, remove the core shaft, pass the lever gauge through the connecting hole of the support device and connect it to the inner hole of the frame, and use the universal seat fine-tuning part to adjust the lever gauge by about half a circle.

[0169] (4) Loosen the screw to ensure that the lever gauge can rotate freely, rotate the lever gauge head to the reference point, and tighten the screw again. Adjust the display needle to the 0 position through fine adjustment. Loosen the screw, rotate the lever gauge clockwise with the axis of the connecting hole of the support device as the center, and record the relative distances of the remaining 7 points relative to the reference point after grinding.

[0170] (5) Continuously monitor and study until the target parameters are reached, that is, the target parameters are the MA and MB values.

[0171] The method of the present invention can ensure that the rotary assembly reaches extremely high precision during axial assembly. The existing assembly precision is unstable, and the general assembly precision is about 0.015mm to 0.050mm, and there is often a loose fit. The contact range of the fitting surface is between 50% and 80%. The technology of the present invention achieves a fitting surface of more than 95% and an assembly precision of less than 0.005mm. . In the method of the present invention, by using the end face grinding device, it can be ensured that the mating end faces of the rotary assembly reach extremely high flatness and finish. Quantitative grinding can control the tilt direction, which can not only ensure the complete fit of the fitting surface, but also achieve the overall flatness within 0.002, mm. In the past, the flatness of the fitting surface after grinding was about 0.005mm to 0.01mm. This not only improves the overall performance of the equipment, but also extends the service life of the equipment. At the same time, due to the improvement of assembly precision, the operation stability and reliability of the equipment are also significantly improved.

[0172] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A method for digitally repairing the axial connection of a frame of a rotating body, characterized in that: Here are the steps: (1) Coordinate system construction of high-precision measurement equipment Use high-precision three-coordinate measuring equipment, referred to as three-coordinate, to place the frame used to assemble the rotating assembly in the direction of the axis of the three-coordinate, ensuring that the line connecting the A and B holes of the frame is relatively parallel to the X axis of the three-coordinate, and the line connecting the C and D holes is relatively parallel to the Y axis of the three-coordinate; After the assembly of the bearing, bearing pressure plate and bearing shaft is completed, the star-shaped measuring needle of the three-coordinate system is used to manually measure the four inner holes of the frame. Each hole has 4 measuring points, and circles A, B, C and D are obtained. The line connecting circles A and B is set as line 1, the line connecting circles C and D is set as line 2, and the intersection point of the two lines is set as P1. Under the existing elements, coordinate system 1 is established; Based on coordinate system 1, parameter programming is used for automatic measurement. The four inner holes of the frame are measured again by three-coordinate automatic measurement. The measured circle is the center of the hole. The number of measurement points of a single circle is 8. Circles A1, B1, C1 and D1 are obtained. The line connecting circles A1 and B1 is set as line X, and the line connecting circles C1 and D1 is set as line Y, as shown in Figure 1. The verticality and position of the two lines X and Y are evaluated. (2) High-precision bearing shaft assembly repeatability confirmation measurement The bearings, bearing pressure plates and shafts were disassembled and tested multiple times. Based on the three-dimensional coordinates, high-precision calibration was performed before measurement. After the calibration, the verticality and position of the assembled frame were measured. When the measured verticality and position were less than 0.005mm, it was confirmed that the frame assembly met the use requirements. The bearings, bearing pressure plates and bearing shafts were removed, left to stand for more than 3 hours, and reassembled. The XY axis parameters were measured through the above steps, and the data were recorded and compared. When the difference between the two measured verticality and position values ​​was less than 0.001mm, it was confirmed that the bearing shaft assembly repeatability met the assembly requirements. (3) Measurement of the distance between the shaft and the back end faces under the establishment of second-order coordinates On the premise of confirming that the bearing shaft assembly repeatability meets the assembly requirements, establish a second-order measurement coordinate system, intersect the measured X and Y lines, obtain the origin D, and establish coordinate system 2; Before measurement, rotate the two shaft backs to the position for use when they are assembled with the internal frame. Under the condition of coordinate system 2, evenly collect eight measurement points on the cut circle with radius R and the hole center as the origin on the end faces of the two shaft backs. The two groups of measurement points are in a one-to-one correspondence. The connecting line of the relative position measurement points is parallel to the axis of the coordinate system. The recording points of the shaft back at the A end are marked as P1, P2, P3, P4, P5, P6, P7, P8, and the recording points of the shaft back at the B end are marked as P1', P2', P3', P4', P5', P6', P7' and P8'. According to the principle of equal division of the measured area, the calculation formula of radius R value is: Where: R 中 is the cross-sectional radius of the sampling point; R is the maximum contact circle radius of the contact surface; r is the minimum contact circle radius of the contact surface. Recording measurement data: (4) Measurement of the distance between the shaft and the back end faces under the second-order coordinate system Under the same conditions, the internal frame is placed on the three-coordinate measuring platform. Based on the four inner holes of the frame, the first-order and second-order coordinate systems are established. Eight measuring points are evenly collected on the Φ45 diameter section circle with the hole center as the origin of the two shaft back-bonded end faces. The two groups of measuring points are in a one-to-one correspondence. The connecting line of the relative position measuring points is parallel to the axis of the coordinate system. The recording points of the A-end bonding end face are marked as P11, P12, P13, P14, P15, P16, P17, and P18, and the recording points of the B-end bonding end face are marked as P11', P12', P13', P14', P15', P16', P17', and P18'. Recording measurement data: (5) Directed quantitative end face parametric repair and compensation completes data collection and performs quantitative data calculation before repair: Relative position deviation value U1 of the sampling point on the back end of the shaft at end A i for: Relative position deviation value U2 of the sampling point on the back end of the shaft at the B end i for: Relative position deviation value of the sampling point of the end face of the shaft back at the A end U3 i for: Relative position deviation value of the sampling point of the B-end shaft back fitting end surface U4 i for: After determining the relative position deviation value of each point on each end face, the repair reference point and the required repair allowance are obtained through statistical calculation based on the one-to-one correspondence: S i =Max(U1 i +U2 i -U3 i -U4 i ) Where: i represents the position of the reference repair point; S i The clearance of the reference repair point; Based on the calculation results, the two end surfaces after bonding are firstly fine-tuned in parallel to ensure that the effective bonding area between the end surfaces reaches more than 90%. The fine-tuning dimension data is calculated as follows; D 修 =(D 基准 -D i )+(d 基准 -d i ) D’ 修 =(D’ 基准 -D’ i )+(d’ 基准 -d’ i ) Where: D' 修 , D 修 The required grinding size; d 基准 , D 基准 The measured distance of the determined benchmark repair point; d i , D i The measured distance of each measuring position point; When the D repair value is a positive number, the frame end face is repaired according to the value. When the D repair value is 0 or a negative number, the end face is not repaired and the original state is maintained. The qualitative correction of the internal frame fitting surface can be completed according to the data. After the repair is completed, step (4) is executed to record the data of each measurement point again. After completing the parallelism repair, the clearance adjustment will be carried out; When repairing, first determine the main repair direction. The direction determination formula is as follows: H=(D 基 -d 基 )-(D’ 基 -d’ 基 ) Where: H is the eccentric distance between the two midlines; D 基 ,d 基 , D' 基 , d' 基 These are the distance measurements of the reference points in turn; When the H value is positive, the main repair direction is the fitting surface of the internal frame end A. When the H value is negative, the main repair direction is the fitting surface of the internal frame end B. The other end is the matching repair situation. The two are repaired in conjunction to ensure that the H value reaches 0. Then determine the repair size according to the single-sided calculation formula as follows: MA=D 基 -d 基 -2*C MB = D' 基 -the 基 -2*C Where: MA is the required repair value of the fitting surface at the A end of the internal frame; MB is the required repair value of the fitting surface at the B end of the internal frame; C is the single-side gap parameter between frames; Based on the reference frame matching single-side clearance table, the required repair value can be calculated: (6) Determine the repair results Based on the calculated repair values, the overall excess of the double end faces is removed on the basis of ensuring the completion of parallelism to achieve high-precision matching of the mating end faces.

2. The method according to claim 1, characterized in that: The measuring accuracy of the high-precision three-coordinate measuring device is (0.6+L / 600) mm.

3. The method according to claim 1 or 2, characterized in that: The method further comprises the steps of: (7) End surface repair monitoring Continuously monitor the research framework until the target parameters are reached. The research process includes parallel research and quantity research. (8) Retest after study With digital reference after precise measurement, qualitative and quantitative end surface repair can be achieved. (9) Re-measure the distance after the repair After grinding, it is necessary to proceed to step (5) to precisely measure the distance results after grinding. When the gap and parallelism meet the requirements, the frame grinding is completed.

4. The method according to claim 3, characterized in that: In the step (7), the end face grinding monitoring device is used to monitor the end face grinding, and the end face grinding monitoring device includes a pedestal, a support device, a mandrel, a lever gauge and a limit column, the lever gauge is a lever gauge with a universal seat, and the grinding frame and the end face grinding monitoring device are detachably connected and arranged; The support device and the limit column are both connected to the pedestal, and the mandrel and the lever indicator can be detachably connected to the support device; The pedestal is arranged in the horizontal direction, and a plurality of limit columns are connected to the upper part of the horizontal side of the pedestal, and the plurality of limit columns are arranged at intervals. The frame to be repaired can be engaged with the upper surface of the pedestal detachably arranged in the plurality of limit columns, and the frame to be repaired is detachably connected to the limit columns, and the limit columns can perform a limit operation on the frame to be repaired; The support device is arranged in the vertical direction, and the support device includes a fixing seat, a nut, a bolt, a support rod, a connecting through hole, a threaded hole and a screw. The support rod is arranged in the vertical direction, and a connecting through hole is coaxially formed in the upper part of the support rod. The connecting through hole is arranged in the horizontal direction. The frame to be repaired includes an inner hole of the frame. The connecting through hole and the inner hole of the frame are arranged opposite to each other in the horizontal direction and are extended from one horizontal side of the support rod to the other horizontal side and pass through the other horizontal side of the support rod. The connecting through hole is matched with the core shaft, and the core shaft can be detachably arranged coaxially with the connecting through hole. The threaded hole is arranged in the vertical direction, the threaded hole extends downward from the top of the support rod, and the bottom of the threaded hole is connected to the connecting through hole, and the screw and the threaded hole can be threadedly engaged and installed together by screwing; The bottom of the support rod is detachably connected to the fixing seat through nuts and bolts, and the angle between the support rod and the fixing seat can be adjusted through nuts and bolts; the fixing seat is connected and set on the pedestal; The core shaft is arranged in the horizontal direction, and the core shaft can be coaxially detachably connected and arranged between the frame inner hole and the connecting through hole of the frame to be repaired. The lever meter can also be detachably connected and arranged between the frame inner hole and the connecting through hole of the frame to be repaired.

5. The method according to claim 4, characterized in that: The method for using the end surface grinding monitoring device comprises the following steps: (1) Install a number of limit columns on the pedestal according to the shape of the frame, so that the frame placed on the pedestal is not easily displaced during repair, and then install the frame in the area surrounded by the upper limit columns on the pedestal; (2) The support device is connected to the pedestal, and the core shaft is coaxially connected and placed between the connecting through hole of the support device and the inner hole of the frame. The screw is screwed down to fix the core shaft so that the core shaft is fixed and cannot move. Then, the support rod is fixed by bolts and nuts so that it cannot move; (3) Then, turn the screw upward to loosen the core shaft, remove the core shaft, pass the lever gauge through the connecting hole of the supporting device and connect it to the inner hole of the frame, and use the universal seat fine-tuning part to make the lever gauge eat half a circle. (4) Loosen the screw to ensure that the lever gauge can rotate freely, rotate the lever gauge head to the reference point, and tighten the screw again; adjust the display needle to the 0 o'clock position through fine adjustment; loosen the screw, rotate the lever gauge clockwise with the axis of the connecting through hole of the support device as the center, and record the relative distances of the remaining 7 points after grinding relative to the reference point; (5) Continuously monitor and study until the target parameters are reached, that is, the target parameters are the MA and MB values.

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