Background technology
Oil seal shaft is at the high accuracy axle that automobile uses also and oil sealing matches.This oil seal shaft is provided with oil seal groove, and its specification requirement is as follows: 1. roughness: Ra0.2~0.4 and Rz<4.2. it is parallel and vertical with shaft centre line that the grain direction that produces after the grinding is wanted.Leakage of oil will not appear if the roughness of the oil seal groove of oil seal shaft and grain direction reach requirement.Traditional processing mode for oil groove mainly contains following several at present: 1, use lathe fine finishining: by test, we find that the roughness curve of turning is by the state that links to each other of triangle clearly, working properties is that the paddy (ditch) of roughness is a helix, extends to the other end from axle head.Therefore the paddy of roughness communicates with the contact portion of oil sealing inner seal lip and extends to atmospheric side, causes fluid-encapsulated thus leakage, so lathe fine finishining is not suitable for oil seal groove.2, use the lathe microstoning: by test, we find the intersection cutter trade on axle surface, become twill-like to enter.Although other fine finishining of the roughness ratio of microstoning gained is little, the cutter trade of twill-like can produce the helicoidal pump effect when axle turns round, extrude to atmospheric side fluid-encapsulated.Therefore, microstoning is not suitable for oil seal groove.3, tumbling processing: tumbling processing is to carry out after turning processing, and lathe adds the dimensional discrepancy in man-hour, affects direct tumbling processing, and lathe processing remaining trace surpasses little roughness, and is therefore fluid-encapsulated, leaks by the paddy of roughness.If oil film is too small, sealing lip can not slide and bite scaling loss, also becomes the reason of leakage.Therefore tumbling processing also is not suitable for oil seal groove.4, emery paper polishing: move vertically the method for polishing with sand paper, we find that the cutter trade of roughness is that axial line is twill-like, as microstoning, can produce leakage.Therefore the emery paper polishing is not suitable for oil seal groove.It is oil-proof when four kinds of present processing modes all can't satisfy oil sealing in sum.
Summary of the invention
The processing method of oil tight a kind of oil seal shaft when the object of the present invention is to provide a kind of oil sealing.The present invention mainly is that employing is static grinding without the feeding fine ginding.
Method of the present invention is specific as follows:
1, will have centerless grinder now reequips:
⑴ centerless grinder emery wheel will satisfy following requirement:
A roughness: Ra0.2~0.4 and Rz<4,
It is parallel and vertical with shaft centre line that the grain direction that produces after the b grinding is wanted,
The c emery wheel will be not easy wearing and tearing, and the one, taking cost into account, and the 2nd, in order to prevent the straight flange run-off the straight of oil groove,
D thickness equals the oil seal groove axial length of axle;
⑵ emery wheel one side is provided with guide wheel, and both axis are parallel, preferably this guide wheel axis and emery wheel axis on the same level face, and the spacing=diameter of work of emery wheel and guide wheel-oil seal groove degree of depth.The wheel shaft of this guide wheel links to each other with motor output shaft.
⑶ be provided with vertical supporting plate between emery wheel and introduction, preferably supporting plate top surface is the inclined-plane.This supporting plate top surface can be provided with the workpiece that axis becomes level, and preferably the axis of workpiece on the supporting plate and emery wheel and guide wheel axis are on the same level face.
⑷ in addition be provided with the transfer roller parallel with axis of workpiece above the location of workpiece so that with Work-sheet pressing, accomplish after axle is by clamping shaftless to movement, thereby guarantee grinding texture.
2, the processing method of static grinding:
⑴ locate workpiece by emery wheel, guide wheel, supporting plate and transfer roller,
⑵ actuating motor, and inject simultaneously grinding fluid to the grinding position, carry out grinding.
The course of work of the present invention is: in motor drives lower tumbler rotation, order about workpiece by frictional drive and rotate thereupon, when this workpiece rotates with emery wheel generation relative motion, so just oil seal groove is carried out grinding.
The present invention compared with prior art has following advantage:
1, the oil seal groove roughness that processes: Ra0.2~0.4 and Rz<4;
2, the grain direction that produces after the grinding is parallel and vertical with shaft centre line; Cutter trade is discontinuous, but vertical to axial line, and this state is the most suitable to the oil seal lip contact portion, accomplishes oil-proofly when matching with oil sealing, meets seal request fully.
3, the inventive method is simple, and is applicable.
The specific embodiment:
Embodiment 1
To have centerless grinder now reequips, at first select CBN emery wheel (CBN140/170B100) as centerless grinder emery wheel 1, it satisfies following requirement: roughness: Ra0.2~0.4 and Rz<4, it is parallel and vertical with shaft centre line that the grain direction that produces after the grinding is wanted, emery wheel will be not easy wearing and tearing, and thickness equals the oil seal groove axial length of axle.Emery wheel one side is provided with guide wheel 2, and both axis are parallel, and this guide wheel axis and emery wheel axis are on the same level face, and the spacing=diameter of work of emery wheel and guide wheel-oil seal groove degree of depth.The wheel shaft of this guide wheel links to each other with motor output shaft.Be provided with vertical supporting plate 3 between emery wheel and introduction, supporting plate top surface is the inclined-plane.This supporting plate top surface can be provided with the workpiece 4 that axis becomes level, and the axis of workpiece on the supporting plate and emery wheel and guide wheel axis are on the same level face.Above the location of workpiece, be provided with in addition the transfer roller parallel with axis of workpiece.During static grinding, by emery wheel, guide wheel, supporting plate and transfer roller workpiece is located, actuating motor, and inject simultaneously the ZR70 grinding fluid to the grinding position, carry out grinding.