CN108747510B - Machining tool for herringbone magnetic steel mounting groove of rotor shaft of large synchronous motor - Google Patents
Machining tool for herringbone magnetic steel mounting groove of rotor shaft of large synchronous motor Download PDFInfo
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- CN108747510B CN108747510B CN201811056072.2A CN201811056072A CN108747510B CN 108747510 B CN108747510 B CN 108747510B CN 201811056072 A CN201811056072 A CN 201811056072A CN 108747510 B CN108747510 B CN 108747510B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 33
- 238000003754 machining Methods 0.000 title claims description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 90
- 238000012545 processing Methods 0.000 claims abstract description 29
- 238000003801 milling Methods 0.000 claims description 23
- 238000009434 installation Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000007514 turning Methods 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/28—Grooving workpieces
- B23C3/34—Milling grooves of other forms, e.g. circumferential
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
- B23Q16/02—Indexing equipment
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- Manufacture Of Motors, Generators (AREA)
Abstract
The invention discloses a processing tool for a herringbone magnetic steel mounting groove of a rotor shaft of a large synchronous motor, which comprises a working platform, a shaft supporting device, a magnetic yoke supporting device, a shaft rotating mechanism and a shaft rotating angle fine-tuning mechanism, wherein the shaft supporting device comprises a left side supporting mechanism and a right side supporting mechanism, the magnetic yoke supporting device comprises a front side supporting mechanism and a rear side supporting mechanism, the shaft rotating mechanism comprises a tool support, a rotary encoder, a cushion block and an encoder mounting base, and the shaft rotating angle fine-tuning mechanism comprises two jacks and two bolts. The processing tool for the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor can realize continuous and stable rotation, accurate equal division and reliable positioning of the rotor shaft, ensure equal division and geometric dimension precision of the rotor shaft and finish processing of a herringbone plane and the magnetic steel mounting groove on the rotor shaft.
Description
Technical Field
The invention relates to a processing tool for a herringbone magnetic steel mounting groove of a rotor shaft of a large synchronous motor.
Background
In the large synchronous motor, the rotor shaft structure is very special, referring to fig. 1a and 1b, the rotor shaft structure of the large synchronous motor mainly comprises three parts, namely a left non-shaft extension hollow shaft 101, a middle hollow magnetic yoke 102 and a right shaft extension hollow shaft 103, the excircle and the plane of the spigot of the large end face of the left non-shaft extension hollow shaft 101 and the right shaft extension hollow shaft 103 are matched with the inner circle and the plane of the flange on the inner circle of the middle hollow magnetic yoke 102, the matched surface adopts matched processing pin holes, and the shafts at two ends are connected with the magnetic yokes by using strong pin bolts 104. The bearing blocks on two sides and the outer circle of the magnetic yoke are kept coaxial through turning, the magnetic yoke part is a cylinder body, 56 inclined planes are required to be machined on the outer circle of the cylinder body, 28 inclined planes are respectively machined on two sides by taking the axial middle position as a boundary line and are distributed in a herringbone shape, two parallel magnetic steel mounting grooves (dove tail grooves) 105 are arranged on each inclined plane, 28 groups of herringbone inclined planes and dove tail grooves for mounting magnetic steel are required to be machined on the outer circle of the magnetic yoke in total, and the requirements on indexing, symmetry degree, dimensional tolerance and surface roughness of the circumference are quite high.
The rotor shaft of the large synchronous motor is made of Q345 steel and is formed by forging, and the rotor shaft is subjected to tempering heat treatment and has good mechanical cutting performance. Referring to fig. 2a and 2b, the requirements of the herringbone magnetic steel installation groove are as follows: the inclined plane center line forms an included angle with the axial center line of the shaft: 3.13 °; bevel plane position degree: < 0.1mm;180 ° distributed two-plane spacing: 2081 (-0.2/-0.4) mm;180 ° distributed two-plane symmetry: < 0.1mm; the planeness of the inclined plane is less than 0.1mm; position degree of two dove tail grooves: less than or equal to 0.02mm; depth of dove tail groove: 10.5 (+0.3/+0.2) mm; slot size of dove tail slot: 25 (+0.3/+0.1) mm; bottom dimensions of the dovetail groove: 32.6 (+0.3/+0.1) mm; surface roughness of the machined surface: ra.3.2.
The processing of the herringbone magnetic steel mounting groove of the rotor shaft needs to solve the following key problems:
1. the symmetry requirements of the grooves at the two axial sides are higher, otherwise, the electric properties at the two axial sides are inconsistent easily, and single-side axial component force is generated;
2. indexing the circumference of the magnetic steel mounting groove;
3. controlling the distance from the bottom of the groove to the center of the shaft;
4. selection and determination of a reference during slot machining.
The problems are very difficult to solve, and the rotor herringbone magnetic steel mounting groove can be truly and effectively machined only by solving the problems one by one.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a processing tool for a herringbone magnetic steel mounting groove of a rotor shaft of a large synchronous motor, which can realize continuous and stable rotation, accurate equal division and reliable positioning of the rotor shaft, ensure equal division and geometric dimension precision of the rotor shaft and finish processing of a herringbone plane and the magnetic steel mounting groove on the rotor shaft.
The technical scheme for achieving the purpose is as follows: the utility model provides a processing frock of large-scale synchronous motor rotor shaft herringbone magnet steel mounting groove, the rotor shaft includes left side non-axle that connects gradually from left to right and stretches end hollow shaft, middle hollow yoke and right side axle stretch end hollow shaft, processing frock includes work platform, axle strutting arrangement, yoke strutting arrangement, axle rotary mechanism and axle rotation angle fine setting mechanism, wherein:
the shaft supporting device comprises a left supporting mechanism and a right supporting mechanism which are symmetrically arranged on the working platform; the left side supporting mechanism and the right side supporting mechanism have the same structure and comprise a first square box base and a sliding bracket, wherein the sliding bracket comprises a supporting plate which is longitudinally arranged and a left-right through shaft hole which is formed in the supporting plate, the supporting plate is fixed at the top end of the first square box base, and the bottom end of the first square box base is fixed on the working platform;
the inner diameter of the shaft hole of the sliding bracket of the left supporting mechanism is matched with the outer diameter of the hollow shaft at the left non-shaft extension end, and the hollow shaft at the left non-shaft extension end is inserted into the shaft hole of the sliding bracket of the left supporting mechanism;
the inner diameter of the shaft hole of the sliding bracket of the right supporting mechanism is matched with the outer diameter of the right shaft extension hollow shaft, and the right shaft extension hollow shaft is inserted into the shaft hole of the sliding bracket of the right supporting mechanism;
the magnetic yoke supporting device comprises a front supporting mechanism and a rear supporting mechanism, the front supporting mechanism and the rear supporting mechanism are arranged on the working platform in a front-back symmetrical mode, the front supporting mechanism and the rear supporting mechanism are identical in structure and comprise a second square box base, an L-shaped supporting plate fixed at the top end of the second square box base and longitudinal locking rods fixed on the vertical parts of the L-shaped supporting plate, the second square box base is fixed on the working platform, and the longitudinal locking rods of the front supporting mechanism and the longitudinal locking rods of the rear supporting mechanism are pressed on the two horizontal radial sides of the middle hollow magnetic yoke in a one-to-one correspondence mode;
the shaft rotating mechanism comprises a tool support, a rotary encoder, a cushion block and an encoder mounting base, wherein the tool support is mounted on the left end face of the left non-shaft extending end hollow shaft, a shaft of the rotary encoder is connected with the tool support, a stator of the rotary encoder is fixed on the cushion block, the cushion block is fixed on the top end of the encoder mounting base, the bottom end of the encoder mounting base is fixed on the working platform, and the encoder mounting base is positioned on the left side of the left supporting mechanism;
the shaft rotation angle fine adjustment mechanism comprises two jacks and two bolts, a plurality of groups of screw holes are uniformly distributed in the middle position of the middle hollow magnetic yoke along the circumference, each group of screw holes comprise two screw holes which are positioned on two radial sides of the middle hollow magnetic yoke in a one-to-one correspondence manner, the two bolts are screwed into the two screw holes on two radial sides of the middle hollow magnetic yoke in a one-to-one correspondence manner, the two jacks are propped against the two bolts in a one-to-one correspondence manner, and the two jacks are fixed on a second square box base of the front side support mechanism and a second square box base of the rear side support mechanism in a one-to-one correspondence manner.
Foretell a processing frock of large-scale synchronous motor rotor shaft chevron shape magnet steel mounting groove, wherein, processing frock still includes planer-type milling machine, planer-type milling machine includes stand, crossbeam and main shaft, wherein:
the upright posts are sequentially connected by a front upright post, an upper longitudinal post and a rear upright post to form a U-shaped structure with a downward opening, and the bottom ends of the front upright post and the rear upright post are respectively fixed on the ground;
the working platform is positioned between the front upright post and the rear upright post;
the cross beams are arranged on the upright posts in a vertically movable manner, the cross beams are longitudinally arranged, and the front ends and the rear ends of the cross beams are connected with the right side of the front upright post and the right side of the rear upright post in a one-to-one correspondence manner;
the main shaft is arranged on the cross beam in a manner of being capable of moving back and forth;
the output shaft of the main shaft is arranged downwards, and a cutter is arranged on the output shaft of the main shaft;
the main shaft is located above the middle hollow magnetic yoke.
The machining tool for the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor is characterized in that the X axis of the planer type milling machine is parallel to the axial center line of the rotor shaft.
The machining tool for the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor comprises a left non-shaft extension end hollow shaft, a left support mechanism and a right support mechanism, wherein the left non-shaft extension end hollow shaft is rotatably inserted into a shaft hole of a sliding bracket of the left support mechanism; the right shaft extension end hollow shaft is rotatably inserted into the shaft hole of the sliding bracket of the right support mechanism.
The machining tool for the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor is characterized in that a locking rod mounting hole is formed in the vertical portion of the L-shaped supporting plate, and the longitudinal locking rod is in threaded connection with the locking rod mounting hole.
The processing tool for the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor can realize continuous and stable rotation, accurate equal division and reliable positioning of the rotor shaft, ensure equal division and geometric dimension precision of the rotor shaft and finish processing of a herringbone plane and the magnetic steel mounting groove on the rotor shaft.
Drawings
FIG. 1a is a front view of a rotor shaft of a large synchronous motor;
FIG. 1b is a side view of a rotor shaft of a large synchronous motor;
FIG. 2a is a schematic diagram of a magnetic steel mounting groove on a rotor shaft of a large synchronous motor;
FIG. 2b is an enlarged view of a portion A of FIG. 2 a;
FIG. 3 is a front view of a tooling for machining a herringbone magnetic steel mounting groove of a rotor shaft of a large synchronous motor;
FIG. 4 is a side view of a tooling for machining a herringbone magnetic steel mounting groove of a rotor shaft of a large synchronous motor;
fig. 5 is a schematic installation diagram of a machining tool for a herringbone magnetic steel installation groove of a rotor shaft of a large synchronous motor on a planer type milling machine.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the following detailed description is provided with reference to the accompanying drawings:
referring to fig. 1a, the rotor shaft includes a left non-shaft-extension hollow shaft 101, an intermediate hollow yoke 102, and a right shaft-extension hollow shaft 103, which are connected in this order from left to right.
Referring to fig. 3 and 4, a machining tool for a herringbone magnetic steel installation groove of a rotor shaft of a large synchronous motor according to a preferred embodiment of the present invention includes a working platform 20, a shaft supporting device, a yoke supporting device, a shaft rotating mechanism and a shaft rotating angle fine tuning mechanism.
The shaft supporting device comprises a left supporting mechanism 1 and a right supporting mechanism 2, wherein the left supporting mechanism 1 and the right supporting mechanism 2 are symmetrically arranged on the working platform 20; the left side supporting mechanism 1 and the right side supporting mechanism 2 have the same structure and comprise a first square box base 11 and a sliding bracket 12, the sliding bracket 12 comprises a supporting plate 121 which is longitudinally arranged and a left-right through shaft hole 122 which is arranged on the supporting plate 12, the supporting plate 121 is fixed at the top end of the first square box base 11, and the bottom end of the first square box base 11 is fixed on a working platform 20; the inner diameter of the shaft hole of the sliding bracket of the left supporting mechanism 1 is matched with the outer diameter of the left non-shaft extension hollow shaft 101, and the left non-shaft extension hollow shaft 101 is rotatably inserted into the shaft hole of the sliding bracket of the left supporting mechanism 1; the inner diameter of the shaft hole of the sliding bracket of the right supporting mechanism 2 is matched with the outer diameter of the right shaft extension hollow shaft 103, and the right shaft extension hollow shaft 103 is rotatably inserted into the shaft hole of the sliding bracket of the right supporting mechanism 2.
The yoke supporting device comprises a front supporting mechanism 3 and a rear supporting mechanism 4, the front supporting mechanism 3 and the rear supporting mechanism 4 are arranged on the working platform 20 in a front-back symmetrical mode, the front supporting mechanism 3 and the rear supporting mechanism 4 are identical in structure, each of the yoke supporting device comprises a second square box base 31, an L-shaped supporting plate 32 fixed at the top end of the second square box base and a longitudinal locking rod 33 fixed on the vertical part of the L-shaped supporting plate 32, the second square box base 31 is fixed on the working platform 20, the longitudinal locking rods of the front supporting mechanism 3 and the longitudinal locking rods of the rear supporting mechanism 4 are pressed on the two horizontal radial sides of the middle hollow yoke 102 in a one-to-one correspondence mode, specifically, locking rod mounting holes are formed in the vertical part of the L-shaped supporting plate 32, the longitudinal locking rods 33 are connected with the locking rod mounting holes in a threaded mode, and the longitudinal locking rods 33 are screwed into the locking rod mounting holes and pressed on the outer circumferential surface of the middle hollow yoke 102, so that the middle hollow yoke 102 is supported.
The shaft rotating mechanism comprises a tool support 51, a rotary encoder 52, a cushion block 53 and an encoder mounting base 54, wherein the tool support 51 is arranged on the left end face of a hollow shaft 101 with a non-shaft extending end on the left side, the shaft of the rotary encoder 52 is connected with the tool support 51, a stator of the rotary encoder 52 is fixed on the cushion block 53, the cushion block 53 is fixed on the top end of the encoder mounting base 54, the bottom end of the encoder mounting base 54 is fixed on the working platform 20, and the encoder mounting base 54 is positioned on the left side of the left side supporting mechanism 1; the encoder mounting base 54 is of square box configuration. During installation, the coaxiality of the shaft of the rotary encoder 52 and the rotor shaft can be adjusted by adjusting an adjusting device of a fixed support on the outer side of a stator of the rotary encoder 52, the rotary encoder 52 adopts a 1.8-ten-thousand-line rotary encoder, the precision of the rotary encoder can reach 1/1000 degrees, and the equally-divided precision meets the technical requirement.
The shaft rotation angle fine adjustment mechanism comprises two jacks 61 and two bolts 62, a plurality of groups of screw holes are uniformly distributed in the middle position of the middle hollow magnetic yoke 102 along the circumference, each group of screw holes comprises two screw holes which are positioned on two radial sides of the middle hollow magnetic yoke 102 in a one-to-one correspondence manner, the two bolts 62 are screwed into the two screw holes on two radial sides of the middle hollow magnetic yoke 102 in a one-to-one correspondence manner, the two jacks 61 bear against the two bolts 62 in a one-to-one correspondence manner, and the two jacks 61 are fixed on the second square box base of the front side support mechanism 3 and the second square box base of the rear side support mechanism 4 in a one-to-one correspondence manner. The bolt 62 is jacked up by the jack 61, so that the rotor shaft is driven to move, and the rotation angle of the rotor shaft is finely adjusted.
Referring to fig. 5, a tooling for machining a herringbone magnetic steel installation groove of a rotor shaft of a large synchronous motor further comprises a planer type milling machine, wherein the planer type milling machine comprises a stand column 30, a cross beam 40 and a main shaft 50, the stand column 30 is sequentially connected with a front stand column 301, an upper longitudinal column 302 and a rear stand column 303 to form a U-shaped structure with a downward opening, and the bottom ends of the front stand column 301 and the rear stand column 303 are respectively fixed on the ground 200; the work platform 20 is located between the front upright 301 and the rear upright 303; the cross beam 40 is arranged on the upright post 30 in a vertically movable way, the cross beam 40 is longitudinally arranged, and the front end and the rear end of the cross beam 40 are connected with the right side of the front upright post 301 and the right side of the rear upright post 303 in a one-to-one correspondence manner; the main shaft 50 is provided on the cross member 40 so as to be movable back and forth; the output shaft of the spindle 50 is disposed downward, and a cutter is disposed on the output shaft of the spindle 50. Spindle 50 is located above intermediate hollow yoke 102.
The invention relates to a processing tool for a herringbone magnetic steel mounting groove of a rotor shaft of a large synchronous motor, which comprises the following steps of: when the axial center line of the rotor shaft is parallel to the X-axis of the planer milling machine, the placement state of the shaft is defined as shaft alignment. The included angle between the central line of the inclined plane on the rotor shaft and the axial central line of the shaft is 3.13 degrees, at this moment, the included angles between the central lines of the inclined planes on two sides of the rotor shaft and the X-axis of the planer type milling machine are 3.13 degrees respectively, and then when the inclined plane and the magnetic steel installation groove are processed, the cutter must move along the inclined line track along the X, Y axis to complete the processing of the inclined plane and the groove, and the processing method must use the planer type milling machine X, Y shaft to carry out linkage processing, and has the advantages that: the clamping is simple; the calibration is convenient; clamping and machining at one time; the operation is relatively easy; the machining precision is high; the processing period is short. The processing method has the defects that: a numerical control machine tool is required; programming is complex; the processing feed track is complex; the operation difficulty is high.
According to the machining tool for the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor, the herringbone plane and the groove are added on the top of the magnet yoke by the planer type milling machine, the magnet yoke supporting devices are added on the two radial sides (two symmetrical positions) of the middle hollow magnet yoke 102, the strength of the magnet yoke is improved, vibration is avoided when the magnet yoke is machined, and therefore the herringbone plane and the dove tail groove are machined similarly to the top of a floor type boring and milling machine during machining. Because the main shaft 50 of the planer type milling machine is arranged on the cross beam 40, the cross beam 40 can flexibly move up and down, the main shaft 50 can flexibly move back and forth on the cross beam 40, the extension length of the main shaft 50 can be randomly adjusted according to the requirement, the rigidity of the main shaft 50 is good, a cutter is not easy to damage, and the dimensional tolerance and the roughness of a processing surface can be ensured. Therefore, the scheme of adding the plane and the groove in the shape of the Chinese character 'ji' at the top of the magnetic yoke can be effectively used, and the scheme has the defects that the machined surface is higher from the working table surface, the labor intensity ratio of operators is increased, and the problem of metal machining can be effectively solved. When the rotor shaft is in rotary indexing, the left non-shaft extension hollow shaft 101 of the rotor shaft can only rotate in the shaft hole of the sliding bracket of the left supporting mechanism 1, and the right shaft extension hollow shaft 103 can only rotate in the shaft hole of the sliding bracket of the right supporting mechanism 2, so that the deflection of the whole rotor shaft can be reduced and limited, and the outer surface of the rotor shaft is not easy to wear, so that the processed rotor shaft finished product meets the use requirement.
The invention relates to a processing tool for a herringbone magnetic steel mounting groove of a rotor shaft of a large synchronous motor, which comprises the following specific working procedures:
(1) And (3) rotor shaft calibration and adjustment: when the worker-shaped magnetic steel installation groove is added, firstly, the rotor shaft must be adjusted, the axial center line of the rotor shaft is parallel to the X-axis of the planer type milling machine in the processing scheme, the processing scheme is very beneficial to the state of adjusting the shaft, and the parallelism between the center line of the shaft and the X-axis of the planer type milling machine can be adjusted only by adjusting the upper bus and the side bus of the outer circles of the bearing blocks at the two ends of the shaft, so that the technical requirement parallelism is less than or equal to 0.02mm. The specific operation is that the dial indicator is arranged on a main shaft of a machine tool, a dial indicator measuring head is propped against an upper bus of the excircle of a bearing gear, the dial indicator reading is read, the dial indicator moves from one side bearing gear to the other side bearing gear along X, the coordinates of a Y axis and a Z axis are kept unchanged, the dial indicator reading is read, the dial indicator reading on two sides is compared, if the difference value is more than 0.02mm, a gasket under a bracket is adjusted until the difference value of the dial indicator reading on two sides is less than or equal to 0.02mm. Measuring a side bus by the same method, reading the readings of the dial indicators of the bearing gear on the two sides of the shaft, and comparing the readings of the dial indicators on the two sides, if the difference is more than 0.02mm, adjusting the front and back positions of the bracket until the difference of the readings of the dial indicators on the two sides is less than or equal to 0.02mm, thereby completing the correction and adjustment of the rotor shaft;
(2) A rotary encoder mounting step: the left end face of the hollow shaft at the left non-shaft extension end of the rotor shaft is provided with a tooling bracket, the tooling bracket is connected with the shaft of the 1.8-ten-thousand-wire rotary encoder, and the stator of the rotary encoder is fixed on a cushion block and used for equally controlling the circumference of the rotating shaft. During installation, the coaxiality of the shaft of the rotary encoder and the rotor shaft can be adjusted by adjusting an adjusting device of a fixed bracket at the outer side of a stator of the rotary encoder, the precision of the rotary encoder can reach 1/1000 degrees, and the equally dividing precision meets the technical requirement;
(3) And a rotor shaft rotation angle adjusting step: in order to realize fine adjustment of the rotation angle of the rotating shaft, screw holes are uniformly distributed and processed in the middle of the cylinder in advance, bolts are screwed into the screw holes, and a jack is used for fine adjustment of the rotation angle of the rotor shaft;
(4) A rotor shaft fixing step: after the circumferential angle of the rotor shaft is adjusted, the rotor shaft needs to be fixed well for machining. The sliding bracket 12 is first fixed by bolts, and because the locking capability of the sliding bracket 12 is limited, the sliding bracket is fixed, and the rotor shaft is easy to rotate and shift in the process of machining the inclined plane and the dovetail groove, so that in order to prevent the situation, after the rotor shaft rotation angle is adjusted by adopting the shaft rotation angle fine adjustment mechanism, the jack 61 is not taken away, and the jack 61 is respectively placed on two radial sides of the middle hollow yoke 102 of the rotor shaft to bear the bolts, so that the shaft is prevented from shaking left and right during machining. Because the middle hollow magnetic yoke 102 is a cylinder body, the wall is thin, the magnetic yoke can vibrate during processing, a cutter is easy to damage, and the dimensional accuracy and the surface roughness of a processing surface are difficult to control. Accordingly, the front side support mechanism 3 and the rear side support mechanism 4 are added to the front and rear sides of the intermediate hollow yoke 102 in one-to-one correspondence.
(5) The method comprises the steps of selecting and processing a cutter, wherein the surface of a rotor magnetic yoke is required to be sequentially processed with 28 groups of herringbone inclined planes and dovetail grooves for mounting magnetic steel, and the dovetail grooves are based on the inclined planes, so that the inclined planes are required to be processed firstly and then the dovetail grooves are processed, the two right-angle sides of the inclined planes are in arc transition and cannot be processed by a common plane milling cutter, the herringbone inclined planes are actually processed by adopting a phi 63 corn milling cutter in an XY axis linkage mode, the periphery of the herringbone inclined planes are processed by adopting a phi 20 end milling cutter, and the rounded corners of the herringbone inclined planes R10 are ensured to be symmetrically processed on two sides. The distance from the inclined plane to the axial center line and the symmetry degree of the two planes distributed at 180 degrees are realized through the process rabbets at the two ends of the magnetic yoke, and the outer circles of the process rabbets are simultaneously processed during shaft turning, so that the coaxiality of the outer circles of the process rabbets and the center line of the shaft is ensured by a machine tool, the diameter size of the outer circles of the process rabbets is equal to the distance size of the two inclined planes distributed at 180 degrees, and the distance from the inclined plane to the axial center line and the symmetry degree of the two planes distributed at 180 degrees can be ensured as long as the inclined plane is well controlled to be tangent with the outer circles of the process rabbets. Two dove tail grooves are to be machined on each inclined plane, each dove tail groove is formed by a size tolerance, an angle tolerance and a relative position tolerance of the two grooves, a phi 25 end mill is firstly used for machining the dove tail grooves, then a custom-made forming milling cutter is used for machining the dove tail grooves, the forming milling cutter is matched with the size of the dove tail grooves meeting design requirements, and the benefits of machining the dove tail grooves through the forming milling cutter are that firstly, machining quality can be improved, secondly, working efficiency can be improved, and thirdly, labor intensity can be reduced.
(6) Measuring a herringbone magnetic steel installation groove: after the dove tail groove is machined, three measuring clamping plates are generally adopted to test the groove-shaped quality, namely a groove-shaped clamping plate, two groove outer side interval dimension clamping plates and two groove inner side interval dimension clamping plates, wherein each clamping plate is a through-stop clamping plate. Measuring the geometric tolerance of the single dovetail groove by using a groove-shaped clamping plate; measuring the space dimension tolerance of the groove by using two space dimension clamping plates at the outer side of the groove and two space dimension clamping plates at the inner side of the groove respectively; because two dove tail grooves on the inclined plane are used for installing magnetic steel, the inspection of the optical clamping plate is insufficient, the magnetic steel is also needed for inspecting the processing quality of the dove tail grooves, and the magnetic steel can be smoothly placed into the dove tail grooves to be qualified.
The machining tool for the herringbone magnet steel mounting groove of the large synchronous motor rotor shaft can solve the problem of machining the herringbone inclined plane and the magnet steel mounting groove, reduce the machining cost, shorten the production period and improve the working efficiency, is a key technology for machining the whole shaft, has high machining quality for the inclined plane and the magnet steel mounting groove, creates favorable conditions for smooth installation of later magnet steel, and can fully finish the machining tasks of the herringbone inclined plane and the magnet steel mounting groove of the rotor shaft.
In summary, the machining tool for the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor can realize continuous and stable rotation, accurate equal division and reliable positioning of the rotor shaft, ensure equal division and geometric dimension precision of the rotor shaft and finish machining of the herringbone plane and the magnetic steel mounting groove on the rotor shaft.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (5)
1. The utility model provides a processing frock of large-scale synchronous motor rotor shaft herringbone magnet steel mounting groove, the rotor shaft includes from left side non-axle that connects gradually to right and stretches end hollow shaft, middle hollow yoke and right side axle stretch end hollow shaft, its characterized in that, processing frock includes work platform, axle strutting arrangement, yoke strutting arrangement, axle rotary mechanism and axle rotation angle fine setting mechanism, wherein:
the shaft supporting device comprises a left supporting mechanism and a right supporting mechanism which are symmetrically arranged on the working platform; the left side supporting mechanism and the right side supporting mechanism have the same structure and comprise a first square box base and a sliding bracket, wherein the sliding bracket comprises a supporting plate which is longitudinally arranged and a left-right through shaft hole which is formed in the supporting plate, the supporting plate is fixed at the top end of the first square box base, and the bottom end of the first square box base is fixed on the working platform;
the inner diameter of the shaft hole of the sliding bracket of the left supporting mechanism is matched with the outer diameter of the hollow shaft at the left non-shaft extension end, and the hollow shaft at the left non-shaft extension end is inserted into the shaft hole of the sliding bracket of the left supporting mechanism;
the inner diameter of the shaft hole of the sliding bracket of the right supporting mechanism is matched with the outer diameter of the right shaft extension hollow shaft, and the right shaft extension hollow shaft is inserted into the shaft hole of the sliding bracket of the right supporting mechanism;
the magnetic yoke supporting device comprises a front supporting mechanism and a rear supporting mechanism, the front supporting mechanism and the rear supporting mechanism are arranged on the working platform in a front-back symmetrical mode, the front supporting mechanism and the rear supporting mechanism are identical in structure and comprise a second square box base, an L-shaped supporting plate fixed at the top end of the second square box base and longitudinal locking rods fixed on the vertical parts of the L-shaped supporting plate, the second square box base is fixed on the working platform, and the longitudinal locking rods of the front supporting mechanism and the longitudinal locking rods of the rear supporting mechanism are pressed on the two horizontal radial sides of the middle hollow magnetic yoke in a one-to-one correspondence mode;
the shaft rotating mechanism comprises a tool support, a rotary encoder, a cushion block and an encoder mounting base, wherein the tool support is mounted on the left end face of the left non-shaft extending end hollow shaft, a shaft of the rotary encoder is connected with the tool support, a stator of the rotary encoder is fixed on the cushion block, the cushion block is fixed on the top end of the encoder mounting base, the bottom end of the encoder mounting base is fixed on the working platform, and the encoder mounting base is positioned on the left side of the left supporting mechanism;
the shaft rotation angle fine adjustment mechanism comprises two jacks and two bolts, a plurality of groups of screw holes are uniformly distributed in the middle position of the middle hollow magnetic yoke along the circumference, each group of screw holes comprise two screw holes which are positioned on two radial sides of the middle hollow magnetic yoke in a one-to-one correspondence manner, the two bolts are screwed into the two screw holes on two radial sides of the middle hollow magnetic yoke in a one-to-one correspondence manner, the two jacks are propped against the two bolts in a one-to-one correspondence manner, and the two jacks are fixed on a second square box base of the front side support mechanism and a second square box base of the rear side support mechanism in a one-to-one correspondence manner.
2. The tooling for machining the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor according to claim 1, wherein the tooling further comprises a planer type milling machine, the planer type milling machine comprises a stand column, a cross beam and a main shaft, and the tooling comprises:
the upright posts are sequentially connected by a front upright post, an upper longitudinal post and a rear upright post to form a U-shaped structure with a downward opening, and the bottom ends of the front upright post and the rear upright post are respectively fixed on the ground;
the working platform is positioned between the front upright post and the rear upright post;
the cross beams are arranged on the upright posts in a vertically movable manner, the cross beams are longitudinally arranged, and the front ends and the rear ends of the cross beams are connected with the right side of the front upright post and the right side of the rear upright post in a one-to-one correspondence manner;
the main shaft is arranged on the cross beam in a manner of being capable of moving back and forth;
the output shaft of the main shaft is arranged downwards, and a cutter is arranged on the output shaft of the main shaft;
the main shaft is located above the middle hollow magnetic yoke.
3. The tooling for machining the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor according to claim 2, wherein the X-axis of the planer type milling machine is parallel to the axial center line of the rotor shaft.
4. The tooling for machining the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor according to claim 1, wherein the left non-shaft extension hollow shaft is rotatably inserted into the shaft hole of the sliding bracket of the left supporting mechanism; the right shaft extension end hollow shaft is rotatably inserted into the shaft hole of the sliding bracket of the right support mechanism.
5. The tooling for machining the herringbone magnetic steel mounting groove of the rotor shaft of the large synchronous motor according to claim 1, wherein the vertical portion of the L-shaped supporting plate is provided with a locking rod mounting hole, and the longitudinal locking rod is in threaded connection with the locking rod mounting hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811056072.2A CN108747510B (en) | 2018-09-11 | 2018-09-11 | Machining tool for herringbone magnetic steel mounting groove of rotor shaft of large synchronous motor |
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| CN201811056072.2A CN108747510B (en) | 2018-09-11 | 2018-09-11 | Machining tool for herringbone magnetic steel mounting groove of rotor shaft of large synchronous motor |
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| CN108747510B true CN108747510B (en) | 2024-03-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113059518B (en) * | 2021-03-16 | 2022-11-08 | 中国航发哈尔滨东安发动机有限公司 | Auxiliary assembly device for large engine rotor |
| CN117811293B (en) * | 2023-12-29 | 2024-10-18 | 江苏旭弘电气科技有限公司 | Automatic imbedding tool for magnetic ferrite rotor |
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| CN108747510A (en) | 2018-11-06 |
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