CN114986077A - Method for repairing spindle unit of high-precision numerically controlled grinder - Google Patents
Method for repairing spindle unit of high-precision numerically controlled grinder Download PDFInfo
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- CN114986077A CN114986077A CN202210651853.6A CN202210651853A CN114986077A CN 114986077 A CN114986077 A CN 114986077A CN 202210651853 A CN202210651853 A CN 202210651853A CN 114986077 A CN114986077 A CN 114986077A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000000227 grinding Methods 0.000 claims abstract description 39
- 238000003754 machining Methods 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 230000008439 repair process Effects 0.000 claims abstract description 11
- 238000013507 mapping Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000005498 polishing Methods 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000000576 coating method Methods 0.000 claims description 15
- 210000003739 neck Anatomy 0.000 claims description 13
- 244000137852 Petrea volubilis Species 0.000 claims description 10
- 238000007790 scraping Methods 0.000 claims description 10
- 241000646858 Salix arbusculoides Species 0.000 claims description 8
- 238000005299 abrasion Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- 230000003116 impacting effect Effects 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 91
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000001050 lubricating effect Effects 0.000 description 6
- 235000013339 cereals Nutrition 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 210000003813 thumb Anatomy 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000020347 spindle assembly Effects 0.000 description 2
- 238000004441 surface measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention relates to a method for repairing a spindle unit of a high-precision numerically controlled grinder, which comprises the following steps: preparing a repair tool; repairing the rear bearing bush, the main shaft journal and the front bearing bush; preparing work in the early stage of running-in of the main shaft bearing bush and running-in of the main shaft bearing bush; the method for repairing the rear bearing bush, the spindle journal and the front bearing bush comprises the following steps: the method comprises the following steps of surveying and mapping a rear bearing bush, checking the front bearing bush, repairing cracks and annular lines of the shaft diameter of a main shaft, repairing the outer conical surface of the rear bearing bush, repairing the inner hole of the rear bearing bush, assembling the rear bearing bush, installing the main shaft, adjusting the gap between the front bearing bush and the main shaft, adjusting the gap between the rear bearing bush and the main shaft, further repairing the oil inlet areas of the front bearing bush and the rear bearing bush, disassembling a main shaft assembly, cleaning various parts, cleaning a grinding head oil tank by using dough, detecting the gap between the front bearing bush, the rear bearing bush and the main shaft, and installing the main shaft assembly. The invention can realize the technical effects of uniform contact between the bearing bush and the main shaft, quick repair of the main shaft and the bearing bush and quick recovery of the machining precision of the high-precision numerical control grinding machine.
Description
Technical Field
The invention relates to the technical field of high-precision numerically controlled grinders, in particular to a method for repairing a spindle unit of a high-precision numerically controlled grinder.
Background
The precision of a grinding machine spindle bearing bush directly influences the grinding precision, the rotation precision of a spindle depends on the oil film pressure of the bearing bush, and the oil film pressure is influenced by the dynamic pressure effect generated by tangential sliding of two matching surfaces of the spindle and the bearing bush and the extrusion effect generated by normal motion. When the main shaft runs stably, oil film pressure is mainly generated by a dynamic pressure effect, namely, dynamic pressure oil wedges are formed, and three conditions are required to be met: 1) the main shaft has enough rotating speed; 2) the lubricating oil has sufficient oil film pressure; 3) a convergent space is required between the shaft diameter of the main shaft and the bearing bush. After the high-precision numerically controlled grinder main shaft and the rear bearing bush are shut down due to the occurrence of serious 'axle-clasping' heating accidents, the rear bearing bush is detected and found: the rear end of an inner hole of a rear bearing bush has a lap wound of about 75mm in length, a 0.08 feeler gauge can be inserted into the periphery of the bearing bush, the size of the inner hole at the front end is phi 145+0.02, the ovality is consistent, the size of the inner hole at the rear end is phi 145-0.16, the inner hole is in an oval state, and air leakage at the position of the bearing bush and pressure relief of a static pressure cavity exist when air blows into an oil pipeline. The above-mentioned back axle bush test data indicate that this back axle bush has scrapped. The abrasion loss of the inner hole of the front bearing bush is about 0.02mm and the roundness is consistent after inspection, which shows that the front bearing bush can be continuously and normally used. At the moment, the spindle unit needs to be repaired quickly by manufacturing various clamping fixtures and establishing a perfect repairing process so as to recover the machining precision of the high-precision numerical control grinding machine.
Disclosure of Invention
In order to solve the technical problem that the spindle unit of the existing high-precision numerically controlled grinder needs to be quickly repaired due to scrapping of a rear bearing bush, the invention provides a method for repairing the spindle unit of the high-precision numerically controlled grinder, which comprises the following steps: preparing a repair tool; repairing the rear bearing bush, the main shaft journal and the front bearing bush; the preparation work of the spindle bearing bush running-in early stage and the running-in of the spindle bearing bush are carried out; the repairing of the rear bearing bush, the main shaft journal and the front bearing bush comprises the following steps: surveying and mapping the rear bearing bush, checking the front bearing bush, repairing cracks and annular lines of the shaft diameter of the main shaft, repairing the outer conical surface of the rear bearing bush, repairing the inner hole of the rear bearing bush, assembling the rear bearing bush, installing the main shaft, adjusting the gap between the front bearing bush and the main shaft, adjusting the gap between the rear bearing bush and the main shaft, further trimming the oil inlet area of the front bearing bush and the rear bearing bush, disassembling the main shaft assembly, cleaning parts of the main shaft, cleaning a grinding head oil tank by using dough, detecting the gap between the front bearing bush and the main shaft, detecting the gap between the rear bearing bush and the main shaft and installing the main shaft assembly.
Furthermore, the repair tool comprises a willow leaf scraper, a triangular scraper, a dial indicator, sand paper, oilstone, red powder, blue oil, an electric filing and polishing machine, a belt pulley nut open wrench, a sleeve, washing oil and an iron rod.
Further, the mapping manufacturing rear bearing bush and the checking front bearing bush comprise the following steps: testing the original rear bearing bush material by sampling and determining the rear bearing bush material, processing and manufacturing an inner hole oil return groove, a static pressure cavity and an oil cavity hole of the rear bearing bush according to the size of the original rear bearing bush, and processing a stress relief groove to relieve stress; when the inner hole abrasion loss of the front bearing bush is checked to be within 0.02mm and the roundness is consistent, the front bearing bush can be continuously and normally used.
Further, the repairing of the cracks and the ring-shaped lines of the spindle shaft diameter comprises the following steps: the crack with the width not larger than 40mm exists in the middle of the contact shaft neck of the main shaft and the rear bearing bush before repair, the front end of the shaft neck is provided with slight annular grains, sand paper is soaked in a main shaft oil basin, and the contact shaft neck of the main shaft and the rear bearing bush is polished by winding oil-stained sand paper with cloth strips until the polishing effects that the crack is obviously lightened and the annular grains disappear are achieved.
Further, the external conical surface of the repaired bearing shell comprises the following steps: after the rear bearing bush manufactured by mapping is manufactured, cleaning an inner cone steel sleeve matched with the rear bearing bush, coating blue oil in an inner hole of the inner cone steel sleeve, and coating the blue oil on the positions of the front bearing bush supporting four ribs; then uniformly coating red lead powder on the outer conical surface of the rear bearing bush, and grinding the outer conical surface of the rear bearing bush and the inner conical surface of the inner conical steel sleeve; after finishing lapping, fixedly placing the lapping assembly on a bench vice, and repeatedly polishing four rib black points on the excircle of the rear bearing bush for multiple times along the arc direction of the rib part by using a scraper rod externally wound with sand paper until the apparent points are qualified.
Further, the repaired inner hole of the bearing bush comprises the following steps: manufacturing a false main shaft for scraping the rear bearing bush, wherein the size of a rear bush journal of the false main shaft is 0.04mm larger than the diameter of the main shaft, and standard free gaps between the front bearing bush and the main shaft and between the rear bearing bush and the main shaft are 0.08mm respectively; removing the high point of the inner hole of the rear bearing bush by using a willow leaf scraper; the rear bearing bush is provided with bush openings, namely an oil inlet area, a bearing area and an oil outlet area, an inner hole of the rear bearing bush is divided into four working cavities by taking four uniformly distributed oil grooves as boundary lines, each working cavity is divided into two lines according to the width of an external rib, the middle part of each line is the bearing area, the part between the right side line of the external rib and the right side oil groove is the oil inlet area, the part between the left side line of the external rib and the left side oil groove is the oil outlet area, in order to improve the polishing smoothness, a conical grinding wheel head on an electric file is used for polishing, then a circular gauze head on the electric file is used for polishing, and the polishing parts are the oil inlet area and the oil outlet area of the four working cavities of the inner hole of the rear bearing bush and are uniformly polished once; scraping an inner hole of the rear bearing bush: red powder is coated inside the rear bearing bush, the false main shaft is fixed firmly after being leveled, and the corresponding shaft diameter between the rear bearing bush and the false main shaft is repeatedly lapped until the number of points of the four bearing areas reaches 10-12 points/25 multiplied by 25 square millimeters.
Further, the assembled bearing shell comprises the following steps: coating red powder on an inner hole and an outer circle of the rear bearing bush, installing the rear bearing bush in a box body hole of a grinding head, accurately installing two positioning screws in the positioning hole of the rear bearing bush, and then installing an inner adjusting nut, an outer adjusting nut and an adjusting pressure pad, wherein the inner adjusting nut and the outer adjusting nut are not locked and are prepared for installing the main shaft; the mounting spindle comprises the following steps: and coating blue oil on the front and rear shaft necks of the spindle, and stably loading the spindle to the original working position.
Further, the adjusting the gap between the front bearing bush and the main shaft comprises the following steps: because the front bearing bush does not have a holding bush, the abrasion loss is small, and the roundness and the size are consistent, the gap between the front bearing bush and the main shaft is adjusted to be zero, and the front bearing bush is used as a reference to scrape the rear bearing bush, namely the reduction bush.
Further, the tile shrinking comprises the following steps: when the grinding head stands at the front end and the rear end of the main shaft, firstly, a left-handed nut inside the front bearing bush is rotated in a clockwise direction, the left-handed nut inside the front bearing bush is used for enlarging the gap of the front bearing bush, then a right-handed nut outside the front bearing bush is rotated in a counterclockwise direction, a small rod and a sleeve impact moving sleeve is used for rotating a right-handed nut outside the front bearing bush, the right-handed nut outside the front bearing bush pushes a pressure pad, and the pressure pad pushes the large end of the front bearing bush to reduce the gap between the front bearing bush and the main shaft; using an open spanner and a sleeve to move a belt pulley nut to drive the main shaft to rotate, using a clearance gauge to detect the clearance of the front bearing bush and continuously adjusting the clearance until the front bearing bush is adjusted until a person moves the sleeve with certain resistance and can move the sleeve; after the front bearing bush is adjusted to be proper in zero clearance, the left-handed nut inside the rear bearing bush is rotated in the anticlockwise direction, the small rod and the sleeve are used for impacting the moving sleeve to rotate the nut inside the rear bearing bush, and the rear bearing bush positioning nut is pre-tightened to prevent the rear bearing bush from moving when the front bearing bush is lapped.
Further, the adjusting of the gap between the bearing bush and the spindle comprises the following steps: scribing lines on the rear bearing bush box body and the outer nut to display the rotation position of the outer nut and the distance between the movement of the outer nut for the last time and the movement of the outer nut for the previous time, and scribing the lines once again every time of grinding to prove that the outer nut for the last time has movement amount compared with the outer nut for the previous time; when the grinding head stands at the front end and the rear end of the main shaft, a right-handed nut inside the rear bearing bush is rotated clockwise, and the right-handed nut inside the rear bearing bush is used for amplifying the gap of the rear bearing bush; rotating a left-handed nut outside the rear bearing bush in a counterclockwise direction, using a small rod and a sleeve to impact a moving sleeve to rotate the left-handed nut outside the rear bearing bush, pushing a pressure pad by the left-handed nut outside the rear bearing bush, and pushing a large end of the rear bearing bush by the pressure pad to reduce a gap between the rear bearing bush and the main shaft; the belt pulley nut is moved by using an open spanner and a sleeve to drive the main shaft to rotate until the rear bearing bush is adjusted until the rear bearing bush is more resistant and can be moved when one person moves the sleeve than the rear bearing bush is moved alone; moving the main shaft to rotate for half a circle, so that the rear bearing bush has more obvious points, and repeatedly scraping the inner hole of the rear bearing bush.
Further, the oil inlet area of the front bearing bush and the rear bearing bush is further trimmed, and the method comprises the following steps of: and after the rear bearing bush bearing area is scraped to be qualified, the front bearing bush and the rear bearing bush are respectively disassembled, and the oil inlet area is further trimmed by using a willow leaf scraper to deepen the gap of the oil inlet area so as to ensure that oil is fully fed.
Furthermore, the dismounting of the main shaft assembly comprises dismounting the main shaft, a front bearing bush outer nut, a rear bearing bush outer nut, a pressure pad, a front bearing bush inner nut and a rear bearing bush inner nut.
Further, the detecting of the gap between the front bearing bush and the main shaft means that the free gap between the front bearing bush and the main shaft is within a range of 0.06mm-0.08mm when the meter is started, and the detecting of the gap between the rear bearing bush and the main shaft means that the free gap between the rear bearing bush and the main shaft is within a range of 0.06mm-0.08mm when the meter is started.
Further, the mounting spindle assembly comprises the steps of: installing a front bearing bush, a rear bearing bush, a pressure pad, four positioning screws and a steel sleeve nut, installing a front bearing bush and a rear bearing bush dynamic pressure pipeline oil tank and filling spindle oil, circularly flushing the front bearing bush and the rear bearing bush dynamic pressure pipeline by using the spindle oil, and opening an oil pump to discharge the spindle oil at a refrigerating machine after circularly flushing the oil pump for half an hour; installing the main shaft, the axial positioning copper gasket, the axial positioning left-handed nut and the axial positioning gland; when the meter is checked on the upper part of the main shaft, the main shaft is pried and lifted by using a sleeve, the steel sleeve nut outside the front bearing bush is continuously rotated in the anticlockwise direction until a meter hand displays 0.04mm, the steel sleeve nut inside the front bearing bush is rotated and pre-tightened in the anticlockwise direction, the front bearing bush is prevented from loosening, and the adjustment of the front bearing bush is finished until the meter hand displays 0.04 mm; when the meter is checked on the upper part of the main shaft, the main shaft of the rear bearing bush is pried and lifted by using a sleeve, the steel sleeve nut outside the rear bearing bush is rotated in the anticlockwise direction until the meter hand shows 0.04mm, the steel sleeve nut inside the rear bearing bush is rotated and pre-tightened in the anticlockwise direction to prevent the rear bearing bush from loosening, and the adjustment of the rear bearing bush is finished; the axial movement of the main shaft is measured to be 0.02mm by surface measurement on the end surface of the main shaft; refilling the main shaft oil to the tank level 2/3; and rechecking the gaps between the front bearing bush and the main shaft and between the rear bearing bush and the main shaft again to meet the technical requirements of standard working gaps.
The standard working clearance of the front bearing bush is 0.04mm, and the standard working clearance of the rear bearing bush is 0.04 mm.
Further, the preparation work of the spindle bearing bush running-in early stage comprises the following steps: starting the main shaft when the temperature of the refrigerator reaches 25 ℃; the front bearing bush temperature sensing device is arranged at a first threaded hole on the front bearing bush, and the rear bearing bush temperature sensing device is arranged at a second threaded hole on the rear bearing bush; and the front bearing bush flow switch is arranged on the front bearing bush lubricating pipeline, and the rear bearing bush flow switch is arranged on the rear bearing bush lubricating pipeline, so that the lubricating condition of the main shaft bearing bush can be detected in real time.
Further, the main shaft bearing bush running-in comprises the following steps: no-load running-in: the rotating speed is 400r/min, the operation is carried out for 15 hours, and the current is reduced to 1.4A from 2.3A; the rotating speed is increased to 600r/min, and the current is 2.2A; the rotating speed is increased to 700r/min, and the current is 2.5A; the rotating speed of one belt is 400r/min, the current is 1.4A, and the belt tensioning device is adjusted to achieve 1.5A; 6 belts are arranged, and running is carried out for one day from low speed to high speed; the 12 belts are put on and run for one day from low speed to high speed; the grinding wheel is mounted, and running in is carried out for one day from low speed to high speed; trial machining parts, wherein the upper amount is 0.02 mm: the grinding speed is 400r/min, the operation is carried out for 15 hours, and the current is reduced to 1.4A from 2.3A; the rotating speed is increased to 600r/min, and the current is 2.2A; the rotating speed is increased to 700r/min, and the current is 2.5A; and detecting the overall dimension, form and position tolerance and surface roughness after the machining is finished, and delivering for production and use when the detection result meets the process requirement of machining part drawings.
Compared with the prior art, the invention has the beneficial effects that: the optimal matching tolerance between the main shaft and the bearing bush is obtained by manufacturing various clamping tools and establishing a perfect repairing process in the repairing process and repeatedly verifying in the repairing practical process; a gap of 0.04mm is ensured between the main shaft and the rear bearing bush by manufacturing the rear bearing bush and manufacturing a false main shaft of the ground bearing bush; the M10 grinding paste is used, the false main shaft is used for honing the rear bearing bush, so that better surface roughness and ideal geometric precision of the rear bearing bush are obtained, uniform contact between the bearing bush and the main shaft is realized, sufficient dynamic pressure oil wedge is formed between the shaft diameter of the main shaft and the bearing bush, the main shaft and the bearing bush are quickly repaired, and the high-precision numerical control grinding machine machining precision is quickly recovered.
Drawings
Fig. 1 is a schematic diagram of a repair process according to a preferred embodiment of the present invention.
FIG. 2 is a schematic flow chart of the present invention for repairing the rear bearing shell, the journal of the spindle, and the front bearing shell in the embodiment of FIG. 1.
Fig. 3 is a schematic structural diagram of the rear bearing shell in the embodiment shown in fig. 1 or fig. 2.
Figure 4 is a cross-sectional view taken along the line a-a of the rear bearing shell of figure 3 according to the present invention.
Description of reference numerals:
1-rear bearing bush; 1.1-oil drain; 1.2-outer ribs; 1.2.1-right side line; 1.2.2-left line; 1.3-a first bearing zone; 1.4-a first oil-in zone; 1.5-a first oil outlet zone; 1.6-a second bearing zone; 1.7-a second oil-intake zone; 1.8-a second oil outlet zone; 1.9-a third bearing zone; 1.10-a third oil-in zone; 1.11-a third oil outlet zone; 1.12-a fourth bearing zone; 1.13-a fourth oil inlet zone; 1.14-fourth oil-out zone.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", and the like in the embodiments indicate orientation words, which are used for simplifying the description of positional relationships based on the drawings of the specification, and do not represent that elements, devices, and the like which are referred to must operate according to specific orientations and defined operations and methods, configurations in the specification, and such orientation terms do not constitute limitations of the present invention.
In order to solve the technical problem that the spindle unit of the existing high-precision numerically controlled grinder needs to be quickly repaired due to the scrapping of a rear bearing bush, the invention provides an embodiment of a method for repairing the spindle unit of the high-precision numerically controlled grinder, which comprises the following steps as shown in fig. 1 and 2: preparing a repair tool; repairing the rear bearing bush 1, the main shaft journal and the front bearing bush; preparing work in the early stage of running-in of the main shaft bearing bush and running-in of the main shaft bearing bush; the repaired rear bearing bush 1, the main shaft neck and the front bearing bush comprise the following steps: surveying and mapping the rear bearing bush 1, checking the front bearing bush, repairing cracks and annular lines of the shaft diameter of the main shaft, repairing the outer conical surface of the rear bearing bush 1, repairing the inner hole of the rear bearing bush 1, assembling the rear bearing bush 1, installing the main shaft, adjusting the gap between the front bearing bush and the main shaft, adjusting the gap between the rear bearing bush 1 and the main shaft, further repairing the oil inlet area of the front bearing bush and the rear bearing bush 1, disassembling the main shaft assembly, cleaning parts of the main shaft, cleaning a grinding head oil tank by using dough, detecting the gap between the front bearing bush and the main shaft, detecting the gap between the rear bearing bush 1 and the main shaft, and installing the main shaft assembly.
The dough is prepared by kneading flour and other components such as liquid, and has high viscosity and strong adsorbability.
Optionally, the repair tool comprises a willow leaf scraper, a triangular scraper, a dial indicator, sandpaper, oilstone, dander, blue oil, an electric file polisher, a pulley nut opening wrench and sleeve, wash oil and an iron rod.
Specifically, the sleeve is 1.5 m, and the iron rod is 12mm in diameter and 200mm in length.
Optionally, as shown in fig. 2, the mapping of the rear bearing shell 1 and the inspection of the front bearing shell includes the following steps: testing the material of the original rear bearing bush by sampling and determining the material of the rear bearing bush 1, machining and manufacturing an inner hole oil return groove, a static pressure cavity and an oil cavity hole of the rear bearing bush 1 according to the size of the original rear bearing bush, and machining a stress relief groove to relieve stress; when the inner hole abrasion loss of the front bearing bush is checked to be within 0.02mm and the roundness is consistent, the front bearing bush can be continuously and normally used.
Specifically, the rear bearing bush 1 is made of ZQSn 10-1.
Optionally, as shown in fig. 2, the repairing cracks and annular striations of the shaft diameter of the main shaft comprises the following steps: the crack is not larger than 40mm in width between the contact shaft neck of the main shaft and the rear bearing bush 1 before repair, the front end of the shaft neck is provided with slight annular grains, sand paper is soaked in a main shaft oil basin, and the contact shaft neck of the main shaft and the rear bearing bush 1 is polished by winding oil-stained sand paper with cloth strips until the polishing effects that the crack is obviously lightened and the annular grains disappear are achieved.
Specifically, the abrasive paper is 600# abrasive paper, the spindle oil is 10# spindle oil, and the polishing time is at least three hours.
Optionally, as shown in fig. 2, the step of repairing the outer tapered surface of the bearing shell 1 includes the following steps: after the rear bearing bush 1 which is manufactured by mapping is manufactured, cleaning an inner cone steel sleeve matched with the rear bearing bush 1, coating blue oil in an inner hole of the inner cone steel sleeve, and coating the blue oil at the position where the blue oil supports four ribs with the front bearing bush; then evenly coating red lead powder on the outer conical surface of the rear bearing bush 1, and grinding the outer conical surface of the rear bearing bush 1 and the inner conical surface of the inner conical steel sleeve; after finishing lapping, fixedly placing the lapping assembly on a bench vice, and repeatedly polishing four rib black points on the excircle of the rear bearing bush 1 for a plurality of times along the arc direction of the rib part by using a scraper rod externally wound with sand paper until the apparent points are qualified.
In this example, the scratch-off point was made more noticeable by applying blue oil; when the outer conical surface of the rear bearing bush 1 and the inner conical surface of the inner conical steel sleeve are ground, a worker needs to put the thumbs of the left hand and the right hand of the worker on the left side and the right side of the rear bearing bush 1, push the thumbs forwards by using impact force, apply uniform force to the two thumbs, and align the two positioning holes in the upper part of the rear bearing bush 1 with the two positioning holes of the inner conical steel sleeve during grinding.
Optionally, as shown in fig. 2 to 4, the repairing of the inner bore of the bearing shell 1 includes the following steps: manufacturing a false main shaft for scraping the rear bearing bush 1, wherein the size of a rear bush journal of the false main shaft is 0.04mm larger than the diameter of the main shaft, and standard free gaps between the front bearing bush and the rear bearing bush 1 and the main shaft are 0.08mm respectively; removing the high points of the inner hole of the rear bearing bush 1 by using a willow leaf scraper; the method comprises the following steps that a bush opening, namely an oil inlet area, a bearing area and an oil outlet area, is formed in a rear bearing bush 1, an inner hole of the rear bearing bush 1 is divided into four working cavities by taking four uniformly distributed oil grooves 1.1 as boundary lines, each working cavity is divided into two lines according to the width of an external rib, the middle part of each two lines is the bearing area, the part between a right side line 1.2.1 of the external rib 1.2 and a right side oil groove 1.1 is the oil inlet area, the part between a left side line 1.2.2 of the external rib 1.2 and a left side oil groove 1.1 is the oil outlet area, in order to improve the polishing smoothness, a conical grinding wheel head on an electric file is used for polishing, then an electric circular yarn cloth head is used for polishing, and the polishing parts are the oil inlet area and the oil outlet area of the four working cavities in the inner hole of the rear bearing bush 1 and are uniformly polished once; scraping an inner hole of the rear bearing bush 1: red powder is coated inside the rear bearing bush 1, the false main shaft is fixed firmly after being leveled, and the corresponding shaft diameter between the rear bearing bush 1 and the false main shaft is repeatedly lapped until the number of points of the four bearing areas reaches 10-12 points/25 multiplied by 25 square millimeters.
In this embodiment, through setting up behind the false main shaft the bush journal size than real main shaft diameter 0.04mm, can guarantee that back axle bush 1 hole has 0.04mm to scrape and grind the surplus, prevent that the unexpected scraping from deviating and can't guarantee the axiality requirement between preceding axle bush and the back axle bush 1. The positions of an oil inlet area and an oil outlet area of the rear bearing bush 1 are opposite to the positions of an oil inlet area and an oil outlet area of the front bearing bush, and can be determined according to the rotation direction of the main shaft.
As shown in fig. 3 and 4, the four working chambers include a first working chamber, a second working chamber, a third working chamber, and a fourth working chamber, the first working chamber includes a first bearing area 1.3, a first oil inlet area 1.4, and a first oil outlet area 1.5, the second working chamber includes a second bearing area 1.6, a second oil inlet area 1.7, and a second oil outlet area 1.8, the third working chamber includes a third bearing area 1.9, a third oil inlet area 1.10, and a third oil outlet area 1.11, and the fourth working chamber includes a fourth bearing area 1.12, a fourth oil inlet area 1.13, and a fourth oil outlet area 1.14.
Optionally, as shown in fig. 2, the assembled bearing shell 1 includes the following steps: coating red powder on an inner hole and an outer circle of the rear bearing bush 1, installing the rear bearing bush 1 in a box body hole of a grinding head, accurately installing two positioning screws in the positioning holes of the rear bearing bush 1, and then installing an inner adjusting nut, an outer adjusting nut and an adjusting pressure pad, wherein the inner adjusting nut and the outer adjusting nut are not locked and are prepared for installing the main shaft; the mounting spindle comprises the following steps: and coating blue oil on the front and rear shaft necks of the spindle, and stably loading the spindle to the original working position.
Optionally, as shown in fig. 2, the adjusting the gap between the front bearing bush and the main shaft includes the following steps: because the front bearing bush does not have a holding bush, the abrasion loss is small, and the roundness and the size are consistent, the gap between the front bearing bush and the main shaft is firstly adjusted to be zero, and the front bearing bush is used as a reference to scrape the rear bearing bush 1, namely the shrinkage bush.
Optionally, as shown in fig. 2, the tile reduction comprises the following steps: when the grinding head stands at the front end and the rear end of the main shaft, firstly, a left-handed nut inside the front bearing bush is rotated in a clockwise direction, the left-handed nut inside the front bearing bush is used for enlarging the gap of the front bearing bush, then a right-handed nut outside the front bearing bush is rotated in a counterclockwise direction, a small rod and a sleeve impact moving sleeve is used for rotating a right-handed nut outside the front bearing bush, the right-handed nut outside the front bearing bush pushes a pressure pad, and the pressure pad pushes the large end of the front bearing bush to reduce the gap between the front bearing bush and the main shaft; using an open spanner and a sleeve to move a belt pulley nut to drive the main shaft to rotate, using a clearance gauge to detect the clearance of the front bearing bush and continuously adjusting the clearance until the front bearing bush is adjusted until a person moves the sleeve with certain resistance and can move the sleeve; after the front bearing bush is adjusted to be proper in zero clearance, the left-handed nut inside the rear bearing bush 1 is rotated in the anticlockwise direction, the small rod and the sleeve are used for impacting the moving sleeve to rotate the nut inside the rear bearing bush 1, the positioning nut of the rear bearing bush 1 is pre-tightened, and the rear bearing bush 1 is prevented from moving when the front bearing bush is lapped.
In particular, the sleeve has a length of 300 mm.
Optionally, as shown in fig. 2, the adjusting the gap between the bearing shell 1 and the main shaft includes the following steps: scribing lines on the rear bearing bush box body and the outer nut to display the rotation position of the outer nut and the distance between the movement of the outer nut for the last time and the movement of the outer nut for the previous time, and scribing the lines once again every time of grinding to prove that the outer nut for the last time has movement amount compared with the outer nut for the previous time; when the grinding head stands at the front end and the rear end of the main shaft, firstly, a right-handed nut in the rear bearing bush 1 is rotated clockwise, and the right-handed nut in the rear bearing bush 1 is used for enlarging the gap of the rear bearing bush 1; then, rotating the left-handed nut outside the rear bearing bush 1 in the counterclockwise direction, using a small rod and a sleeve to impact a moving sleeve to rotate the left-handed nut outside the rear bearing bush 1, pushing a pressure pad by the left-handed nut outside the rear bearing bush 1, and pushing the large end of the rear bearing bush 1 by the pressure pad to reduce the gap between the rear bearing bush 1 and the main shaft; the main shaft is driven to rotate by using an open spanner and a sleeve pipe to move a belt pulley nut until the rear bearing bush 1 is adjusted until the rear bearing bush 1 has larger resistance and can be moved when one person moves the sleeve pipe than the rear bearing bush 1 is moved alone; moving the main shaft to rotate for a half circle to enable the rear bearing bush 1 to show points more obviously, and repeatedly scraping the inner hole of the rear bearing bush 1.
Optionally, as shown in fig. 2, the further trimming of the oil feeding areas of the front and rear bearing shells 1 includes the following steps: after the bearing area of the rear bearing bush 1 is scraped to be qualified, the front bearing bush and the rear bearing bush 1 are respectively disassembled, and the oil inlet area is further trimmed by using a willow leaf scraper to deepen the gap of the oil inlet area so as to ensure that oil is sufficiently fed
Optionally, as shown in fig. 2, the disassembling the main shaft assembly includes disassembling the main shaft, a front bearing outer nut, a rear bearing outer nut, a pressure pad, a front bearing inner nut, and a rear bearing inner nut.
Optionally, as shown in fig. 2, the detecting the clearance between the front bearing bush and the main shaft means that the free clearance between the front bearing bush and the main shaft is in a range of 0.06mm-0.08mm by a dial gauge, and the detecting the clearance between the rear bearing bush 1 and the main shaft means that the free clearance between the rear bearing bush 1 and the main shaft is in a range of 0.06mm-0.08mm by the dial gauge.
Optionally, as shown in fig. 2, the mounting of the spindle assembly comprises the steps of: installing a front bearing bush, a rear bearing bush 1, a pressure pad, four positioning screws and a steel sleeve nut, installing a dynamic pressure pipeline oil tank of the front bearing bush and the rear bearing bush 1, filling spindle oil, circularly flushing the dynamic pressure pipeline of the front bearing bush and the rear bearing bush 1 by using the spindle oil, and opening an oil pump to discharge the spindle oil at a refrigerating machine after circularly flushing the oil pump for half an hour; installing the main shaft, the axial positioning copper gasket, the axial positioning left-handed nut and the axial positioning gland; when the meter striking detection is carried out on the upper part of the main shaft, the main shaft is pried and lifted by using a sleeve, the steel sleeve nut outside the front bearing bush is continuously rotated in the anticlockwise direction until a meter hand displays 0.04mm, the steel sleeve nut inside the front bearing bush is rotated and pre-tightened in the anticlockwise direction to prevent the front bearing bush from loosening, and the adjustment of the front bearing bush is completed; when the meter striking detection is carried out on the upper part of the main shaft, the rear bearing bush main shaft is pried and lifted by using a sleeve, the steel sleeve nut outside the rear bearing bush 1 is rotated in the anticlockwise direction until a meter hand displays 0.04mm, the steel sleeve nut inside the rear bearing bush 1 is rotated and pre-tightened in the anticlockwise direction to prevent the rear bearing bush 1 from loosening, and the adjustment of the rear bearing bush 1 is completed; the axial movement of the main shaft is measured to be 0.02mm by surface measurement on the end surface of the main shaft; refilling the main shaft oil to the tank level 2/3; and rechecking the gaps between the front bearing bush and the main shaft and between the rear bearing bush 1 and the main shaft again to meet the technical requirements of standard working gaps.
In this embodiment, the standard working clearance of the front bearing shell is 0.04mm, and the standard working clearance of the rear bearing shell 1 is 0.04 mm.
Optionally, as shown in fig. 1, the preparation work for the running-in early stage of the spindle bearing shell includes the following steps: starting the main shaft when the temperature of the refrigerator reaches 25 ℃; the front bearing bush temperature sensing device is arranged at a first threaded hole on the front bearing bush, and the rear bearing bush temperature sensing device is arranged at a second threaded hole on the rear bearing bush 1; and the front bearing bush flow switch is arranged on the front bearing bush lubricating pipeline, and the rear bearing bush 1 flow switch is arranged on the rear bearing bush 1 lubricating pipeline, so that the lubricating condition of the main shaft bearing bush can be detected in real time.
Optionally, as shown in fig. 1, the running-in of the spindle bearing shell includes the following steps: no-load running-in: the rotating speed is 400r/min, the operation is carried out for 15 hours, and the current is reduced to 1.4A from 2.3A; the rotating speed is increased to 600r/min, and the current is 2.2A; the rotating speed is increased to 700r/min, and the current is 2.5A; the rotation speed of one belt is 400r/min, the current is 1.4A, and the belt tensioning device is adjusted to reach 1.5A; 6 belts are arranged, and running is carried out for one day from low speed to high speed; the 12 belts are put on and run for one day from low speed to high speed; the grinding wheel is mounted, and running in is carried out for one day from low speed to high speed; trial machining parts, wherein the upper amount is 0.02 mm: the grinding speed is 400r/min, the operation is carried out for 15 hours, and the current is reduced to 1.4A from 2.3A; the rotating speed is increased to 600r/min, and the current is 2.2A; the rotating speed is increased to 700r/min, and the current is 2.5A; and detecting the overall dimension, form and position tolerance and surface roughness after the machining is finished, and delivering for production and use when the detection result meets the process requirement of machining part drawings.
The optimal matching tolerance between the main shaft and the bearing bush is obtained by manufacturing various clamping tools and establishing a perfect repairing process in the repairing process and repeatedly verifying in the repairing practical process; by manufacturing the rear bearing bush 1 and manufacturing a false main shaft of the ground bearing bush 1, a gap of 0.04mm is ensured between the main shaft and the rear bearing bush 1; the M10 grinding paste is used, the false main shaft is used for honing the rear bearing bush 1, so that better surface roughness and ideal geometric precision of the rear bearing bush 1 are obtained, uniform contact between the bearing bush and the main shaft is realized, sufficient dynamic pressure oil wedge is formed between the shaft diameter of the main shaft and the bearing bush, the main shaft and the bearing bush are quickly repaired, and the high-precision numerical control grinding machine machining precision is quickly recovered.
While the present invention has been described with reference to the preferred embodiments, it is not to be restricted by the embodiments. Those skilled in the art can make various permutations and combinations of the above-described preferred embodiments and form a complete solution without departing from the spirit and scope of the present invention, which is defined by the claims.
Claims (10)
1. A method for repairing a spindle unit of a high-precision numerically controlled grinder is characterized by comprising the following steps: preparing a repair tool; repairing the rear bearing bush (1), the main shaft journal and the front bearing bush; the preparation work of the spindle bearing bush running-in early stage and the running-in of the spindle bearing bush are carried out; the repaired rear bearing bush (1), the main shaft journal and the front bearing bush comprise the following steps: surveying and mapping the rear bearing bush (1), checking the front bearing bush, repairing cracks and annular lines of the shaft diameter of the main shaft, repairing the outer conical surface of the rear bearing bush (1), repairing the inner hole of the rear bearing bush (1), assembling the rear bearing bush (1), installing the main shaft, adjusting the gap between the front bearing bush and the main shaft, adjusting the gap between the rear bearing bush (1) and the main shaft, further trimming the oil inlet areas of the front bearing bush and the rear bearing bush (1), disassembling the main shaft assembly, cleaning parts of the main shaft, cleaning a grinding head oil tank by using dough, detecting the gap between the front bearing bush and the main shaft, detecting the gap between the rear bearing bush (1) and the main shaft and installing the main shaft assembly.
2. The method for repairing the spindle unit of the high-precision numerically controlled grinder as claimed in claim 1, wherein the steps of mapping the post-manufactured bearing shell (1) and inspecting the pre-manufactured bearing shell comprise: testing the material of the original rear bearing bush by sampling and determining the material of the rear bearing bush (1), machining and manufacturing an inner hole oil return groove, a static pressure cavity and an oil cavity hole of the rear bearing bush (1) according to the size of the original rear bearing bush, and machining a stress relief groove to relieve stress; when the inner hole abrasion loss of the front bearing bush is checked to be within 0.02mm and the roundness is consistent, the front bearing bush can be continuously and normally used.
3. The method for repairing the spindle unit of the high-precision numerically controlled grinder as claimed in claim 1, wherein the repairing cracks and annular grains in the spindle diameter comprises the following steps: the crack is not larger than 40mm in width in the middle of the contact shaft neck of the main shaft and the rear bearing bush (1) before repair, the front end of the shaft neck is provided with slight annular grains, sand paper is soaked in a main shaft oil basin, and the contact shaft neck of the main shaft and the rear bearing bush (1) is polished by winding oil-stained sand paper with cloth strips until the polishing effects that the crack is obviously lightened and the annular grains disappear are achieved.
4. The method for repairing the spindle unit of the high-precision numerically controlled grinder as claimed in claim 1, wherein the repairing of the external conical surface of the bearing shell (1) comprises the following steps: after the rear bearing bush (1) manufactured by mapping is manufactured, cleaning an inner cone steel sleeve matched with the rear bearing bush (1), coating blue oil in an inner hole of the inner cone steel sleeve, and coating the blue oil on the positions of the front bearing bush supporting four ribs; then uniformly coating red lead powder on the outer conical surface of the rear bearing bush (1), and grinding the outer conical surface of the rear bearing bush (1) and the inner conical surface of the inner conical steel sleeve; after finishing lapping, fixedly placing the lapping assembly on a bench vice, and repeatedly polishing four rib black point positions of the excircle of the rear bearing bush (1) for a plurality of times along the arc direction of the rib part by using a scraper rod externally wound with sand paper until the apparent points are qualified.
5. The method for repairing the spindle unit of the high-precision numerically controlled grinder as claimed in claim 1, wherein the repairing of the inner hole of the bearing shell (1) comprises the following steps: manufacturing a false main shaft for scraping the rear bearing bush (1), wherein the size of a rear bush journal of the false main shaft is 0.04mm larger than the diameter of the main shaft, and standard free gaps between the front bearing bush and the main shaft and between the rear bearing bush (1) and the main shaft are 0.08mm respectively; removing the high points of the inner hole of the rear bearing bush (1) by using a willow leaf scraper; the rear bearing bush is characterized in that a bush opening, namely an oil inlet area, a bearing area and an oil outlet area, is formed in the rear bearing bush (1), an inner hole of the rear bearing bush (1) is divided into four working cavities by taking four uniformly distributed oil grooves (1.1) as boundary lines, each working cavity is divided into two lines according to the width of an external rib (1.2), the middle part of each two line is the bearing area, the part between a right side line (1.2.1) and a right side oil groove (1.1) of the external rib (1.2) is the oil inlet area, the part between a left side line (1.2.2) and a left side oil groove (1.1) of the external rib (1.2) is the oil outlet area, in order to improve the polishing smoothness, a conical grinding wheel head on an electric file is used for polishing, then a circular yarn cloth head on the electric file is used for polishing, and the parts of the oil inlet area and the oil outlet area of the four working cavities in the inner hole of the rear bearing bush (1) are uniformly polished once; inner hole scraping of the rear bearing bush (1): red powder is coated inside the rear bearing bush (1), the false main shaft is fixed firmly after being leveled, and the corresponding shaft diameter between the rear bearing bush (1) and the false main shaft is repeatedly lapped until the number of points of four bearing areas reaches 10-12 points/25 multiplied by 25 square millimeters.
6. The method for repairing the spindle unit of the high-precision numerically controlled grinder as claimed in claim 1, wherein the assembled bearing shell (1) comprises the following steps: coating red powder on an inner hole and an outer circle of the rear bearing bush (1), installing the rear bearing bush (1) in a box body hole of a grinding head, accurately installing two positioning screws in the positioning holes of the rear bearing bush (1), and then installing an inner adjusting nut, an outer adjusting nut and an adjusting pressure pad, wherein the inner adjusting nut and the outer adjusting nut are not locked and are prepared for installing the main shaft; the mounting spindle comprises the following steps: and coating blue oil on the front and rear shaft necks of the spindle, and stably loading the spindle to the original working position.
7. The method for repairing the spindle unit of the high-precision numerically controlled grinding machine according to claim 1, wherein the step of adjusting the gap between the bearing bush and the spindle before the adjustment comprises the following steps: because the front bearing bush does not have a holding bush, the abrasion loss is small, and the roundness and the size are consistent, the gap between the front bearing bush and the main shaft is adjusted to be zero, and the front bearing bush is used as a reference to scrape the rear bearing bush, namely the reduction bush.
8. The method for repairing the spindle unit of the high-precision numerically controlled grinder as claimed in claim 7, wherein the tile reduction comprises the following steps: when the grinding head stands at the front end and the rear end of the main shaft, firstly, a left-handed nut inside the front bearing bush is rotated in a clockwise direction, the left-handed nut inside the front bearing bush is used for enlarging the gap of the front bearing bush, then a right-handed nut outside the front bearing bush is rotated in a counterclockwise direction, a small rod and a sleeve impact moving sleeve is used for rotating a right-handed nut outside the front bearing bush, the right-handed nut outside the front bearing bush pushes a pressure pad, and the pressure pad pushes the large end of the front bearing bush to reduce the gap between the front bearing bush and the main shaft; using an open spanner and a sleeve to move a belt pulley nut to drive the main shaft to rotate, using a clearance gauge to detect the clearance of the front bearing bush and continuously adjusting the clearance until the front bearing bush is adjusted until a person moves the sleeve with certain resistance and can move the sleeve; after the front bearing bush is adjusted to be proper in zero clearance, a left-handed nut in the rear bearing bush (1) is rotated in the anticlockwise direction, a small rod and a sleeve are used for impacting a moving sleeve to rotate a nut in the rear bearing bush (1), and a positioning nut of the rear bearing bush (1) is pre-tightened to prevent the rear bearing bush (1) from moving when the front bearing bush is lapped.
9. The method for repairing the main shaft unit of the high-precision numerical control grinding machine according to claim 1, characterized in that the clearance between the adjusted bearing bush (1) and the main shaft comprises the following steps: scribing lines on the rear bearing bush box body and the outer nut to display the rotation position of the outer nut and the distance between the movement of the outer nut for the last time and the movement of the outer nut for the previous time, and scribing the lines once again every time of grinding to prove that the outer nut for the last time has movement amount compared with the outer nut for the previous time; when the grinding head stands at the front end and the rear end of the main shaft grinding head, a right-handed nut inside the rear bearing bush (1) is rotated clockwise, and the right-handed nut inside the rear bearing bush (1) is used for enlarging the gap of the rear bearing bush (1); then, rotating a left-handed nut outside the rear bearing bush (1) in a counterclockwise direction, using a small rod and a sleeve to impact a moving sleeve to rotate the left-handed nut outside the rear bearing bush (1), pushing a pressure pad by the left-handed nut outside the rear bearing bush (1), and pushing the large end of the rear bearing bush (1) by the pressure pad to reduce the gap between the rear bearing bush (1) and the main shaft; the main shaft is driven to rotate by using an open spanner and a sleeve pipe to move a belt pulley nut until the rear bearing bush (1) has larger resistance and can be moved when one person moves the sleeve pipe than the rear bearing bush (1) is moved alone, and the rear bearing bush (1) is adjusted to the position; moving the main shaft to rotate for a half circle to enable the rear bearing bush (1) to show points more obviously, and repeatedly scraping the inner hole of the rear bearing bush (1).
10. The method for repairing the spindle unit of the high-precision numerically controlled grinding machine according to claim 1, wherein the step of further trimming the oil inlet areas of the front bearing shell and the rear bearing shell (1) comprises the following steps: after the bearing area of the rear bearing bush (1) is scraped to be qualified, the front bearing bush and the rear bearing bush (1) are respectively disassembled, and the oil inlet area is further trimmed by using a willow leaf scraper to deepen the gap of the oil inlet area so as to ensure that oil is fully fed.
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| CN111571113A (en) * | 2020-05-28 | 2020-08-25 | 三一重机有限公司 | Bearing bush seat repairing method |
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| CN101185999A (en) * | 2006-11-17 | 2008-05-28 | 上海浦东汉华科技工程公司 | Technique method for in situ repairing large and middle diesel engine crank axle in machine |
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| WO2012045538A1 (en) * | 2010-10-06 | 2012-04-12 | Sms Siemag Ag | Method for preparing a bearing arrangement, and bearing arrangement |
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