Double-channel grinding method of double-row ball bearing
(1) technical field
The present invention relates to a kind of double-channel grinding method of double-row ball bearing, be applicable to the double channel grinding of double-row angular contact bal bearing outer ring, biserial deep groove ball bearing Internal and external cycle and automobile third-generation hub bearing inner race and flange shaft assembly.Belong to field of machining.
(2) background technology
The mill crudy of two-row ball bearing double channel is one of major event index of examination two-row ball bearing product quality, directly influence the play size and the trap rate of two-row ball bearing, influence the product quality and the working (machining) efficiency of two-row ball bearing, and the trap rate that how can correctly, effectively control the play of two-row ball bearing and improve product is current many Production of bearing enterprise's long-term existence and fail one of technical barrier that effectively solves.Want head it off, crucial also the need guarantees on the grinding technique of two-row ball bearing double channel, present all multiple enterprises are not grasped its technology or are adopted the typing grinding of two ditches to this, part enterprise configuration forming tool carries out grinding, but different bearings is different because of the radius of curvature and the distance between two ditches of raceway groove, need the different forming tool of configuration, the production cost height, working (machining) efficiency is low or two ditches of bearing ring are adopted turn around twice grinding or separately grinding, inconsistent and mismachining tolerance because of the bearing ring width dimensions, cause the distance between bearing two ditches discrete bigger, the trap rate is lower, reworks are more, and the bearing products difficult quality control effectively, and are unfavorable to reliability and security that bearing uses.
(3) summary of the invention
Technical problem to be solved by this invention is to provide a kind of simple, efficient, stable double-channel grinding method of double-row ball bearing, and the two-row ball bearing quality of processing is good, trap rate height, productivity effect height.
A kind of double-channel grinding method of double-row ball bearing is characterized in that: adjust centerless fixture, the supporting of the axial location of centerless fixture is carried out grinding with the mode of equipment autogenous grinding, and Control Shaft to the end face run-out of positioning support in 2 μ m; According to the size that is ground lasso---raceway diameter De/di and ditch position a/b, ditch spacing a1/b1, the requirement of the radius of curvature R e/Ri of raceway groove; Adjust the angle [alpha] of equipment work-piece frame, the angle adjustment scope is used CNC digital control system switch board again between 0 ° to 25 °, the shape of control grinding wheel arc dresser single-point finishing emery wheel; The locating surface that will be ground lasso again is fixed on the centerless fixture, and employing CNC digital control system switch board, control appliance work rest X-axis and emery wheel grind the feed distance of frame Z axle simultaneously, after the locking, rotary electric main shaft and slewing work spindle drive and are ground lasso, make emery wheel enter the first row raceway groove and carry out grinding; After the first row raceway groove grinding is finished,, emery wheel is fed into the secondary series raceway groove by the CNC digital control system, and locking, grinding secondary series raceway groove.
The beneficial effect of double-channel grinding method of double-row ball bearing of the present invention is: described double-channel grinding method of double-row ball bearing, used cleverly with the same plane of product as grinding as benchmark, be implemented in the two ditches of mill in the homogeneous clamping, easy and simple to handle, grasp easily, equipment cost is low, the product processed quality is good, product trap rate height, high efficiency.Applied widely, the radius of curvature of different channel dimensions, different raceway grooves, different two ditch pitch axis bearing rings etc. all can be processed.
(4) description of drawings
Fig. 1 is the structural representation of two-row ball bearing of the present invention outer ring channel grinding method of double.
Fig. 2 is the structural representation of two-row ball bearing automobile third-generation hub bearing inner race of the present invention and flange shaft assembly channel grinding method of double.
Among the figure, the 1-centerless fixture; The 2-grinding wheel arc dresser; The 3-emery wheel; 4-is ground the double channel lasso; 5-equipment work-piece main shaft; The just rotatable electric main shaft of 6-; 7-CNC digital control system switch board; The moving direction of X-axis---work rest; Z axle---the moving direction of emery wheel mill frame.
(5) specific embodiment
The invention will be further described below in conjunction with embodiment, but protection scope of the present invention is not limited to this.
With reference to the method for grinding raceway of inner ring of angular contact ball hub bearing of automobile of Fig. 1, present embodiment, comprise centerless fixture 1, grinding wheel arc dresser 2, emery wheel 3, be ground double channel lasso 4, equipment work-piece frame 5, electric main shaft 6 and switch board 7.
Described centerless fixture is made up of axial location supporting and 2 radial supports.The end face run-out of axial location supporting is controlled in the 2 μ m.
Describedly be ground mill processing and automobile third-generation hub bearing inner race and the flange shaft assembly that the double channel lasso is double-row angular contact bal bearing outer ring, biserial deep groove ball bearing Internal and external cycle double channel.And during the double channel lasso that is ground mill double channel is same datum level, with a clamping.
Described electric main shaft is just rotatable electric main shaft.
Described switch board is the switch board of CNC digital control system.
Workflow of the present invention is: adjust centerless fixture 1, the supporting of the axial location of centerless fixture is carried out grinding with the mode of equipment autogenous grinding, and Control Shaft to the end face run-out of positioning support in 2 μ m.According to the size that is ground lasso 4---raceway diameter De/di and ditch position a/b, ditch spacing a1/b1, the requirement of the radius of curvature R e/Ri of raceway groove.Adjust the angle [alpha] of equipment work-piece frame 5, the angle adjustment scope is used CNC digital control system switch board 7 again between 0 ° to 25 °, the shape of control grinding wheel arc dresser 2 single-point finishing emery wheels 3.The locating surface that will be ground lasso 4 again is fixed on the centerless fixture 1, and employing CNC digital control system switch board 7, control appliance work rest X-axis and emery wheel grind the feed distance of frame Z axle simultaneously, after the locking, rotary electric main shaft 6 and slewing work spindle 5 drive and are ground lasso 4, make emery wheel 3 enter the first row raceway groove and carry out grinding.After the first row raceway groove grinding is finished,, emery wheel is fed into the secondary series raceway groove by the CNC digital control system, and locking, grinding secondary series raceway groove.This method for grinding according to be ground inner ring 4 size---the measurement result of the radius of curvature R i of raceway diameter di and position b, raceway groove is adjusted by CNC digital control system switch board 7, be applicable to single-piece, small lot and the grinding in batches of the double channel of double-row angular contact bal bearing outer ring, biserial deep groove ball bearing Internal and external cycle and automobile third-generation hub bearing inner race and flange shaft assembly.