The two clamping grinding process of raceway in railway truck bearing outer ring
One, technical field:
The present invention relates to a kind of transportation and communication bearing manufacturing process, particularly relate to the grinding process of the two raceways in railway truck bearing outer ring.
Two, background technology:
At present, the factory of domestic railway bearing to railway bearing outer ring two raceway grindings all adopt the secondary clamping, the old technology of secondary grinding.It is the A raceway of first grinding outer ring, again processing work is changed the B raceway of face (standing up) grinding outer ring, because magnetic clamp is adopted in the bearing outer ring grinding, it is to utilize plane of outer ring and outer ring external diameter a certain section as datum level, therefore, the parallel error of two end faces of outer ring and vertical difference to foreign round directly have influence on the concentricity of two raceways and run-out error to foreign round, simultaneously because the secondary clamping, the out-of-roundness of outer round surface and clean-up performance also will inevitably produce the clamping error, and therefore traditional processing technology is difficult to guarantee to reach high-precision requirement.
Three, summary of the invention:
Technical problem to be solved by this invention: a kind of two clamping grinding process of raceway in railway truck bearing outer ring that overcome above-mentioned defective, raising machining accuracy are provided.
The technical scheme that overcomes the above problems: adopt the numerical control fully automatic system, it is characterized in that: also comprise selection of process parameters; The curve correction of both sides, outer ring A raceway, B raceway; Grinding A raceway, grinding B raceway; Formed grinding wheel is done the reciprocating vibration motion when the raceway grinding is rotated, its reciprocating vibration direction is consistent with A raceway taper direction when grinding A raceway, and is consistent with B raceway taper direction during grinding B raceway.
The beneficial effect of patent of the present invention: owing to reduced the clamping time No. one time, thereby improved production efficiency greatly, production efficiency is brought up to 30 seconds/part from 50 seconds/part of traditional handicraft, improved machining accuracy greatly, two raceways in outer ring nonconcentricity error is to foreign round reduced, two times of offsets measuring are brought up to 5 μ m from 10 μ m of traditional handicraft, have greatly improved the social benefit and the economic benefit of enterprises of producing bearing enterprise.
Four, description of drawings:
Accompanying drawing 1 a clamping grinding A raceway processing step schematic diagram of the present invention,
Wherein: 2-location cylindrical, 3-workpiece, 4-formed grinding wheel, 12-A raceway, 14-B raceway, 15-B end face
Accompanying drawing 2 clamping grinding B raceway processing step schematic diagrames of the present invention
Five, the specific embodiment:
Below in conjunction with accompanying drawing 1 and accompanying drawing 2, the present invention is further described with the full-automatic railway bearing outer ring raceway grinding machine of NC2 Shaft and NC Machining Test:
1) enter magnetic clamp with manipulator holding workpiece 3 location cylindricals 2 and clamp,
2) the every technological parameter in the processing of selected grinding outer
ring A raceway 12, B raceway 14 is as follows:
Project | Processing A raceway (mm) | Processing B raceway (mm) | Project | Grinding amplitude (mm) | Speed (mm/s) |
F.F. | 15.460 | ?15.520 | Vibration | 3.00 | ??3.00 |
Become soon | 0.300 | ?0.300 | | | |
Slightly advance | 0.050 | ?0.020 | | | |
Progress greatly | 0.050 | ?0.009 | | | |
Light advances | 0.020 | ?0.005 | | | |
3) formed grinding wheel 4 by the curve shape of outer ring two limit raceways is modified to identical shaped curve with A raceway 12, B raceway 14;
4) center with the width of formed grinding wheel 4 is moved to the left 2mm, and grinding A raceway 12 is because the center of the width of formed grinding wheel 4 is moved to the left 2mm, so B raceway 14 does not participate in grinding;
5) behind the intact A raceway 12 of grinding, make the center of the width of formed grinding wheel 4 4mm that moves right again, grinding B raceway 14, the 2mm+2MM because the center of the width of formed grinding wheel 4 moves right is not so A raceway 12 participates in grinding;
When difference grinding A raceway 12 and B raceway 14, the formed grinding wheel 4 of rotation is done the reciprocating vibration motion, its reciprocating vibration direction: consistent with the taper direction of A raceway 12 when grinding A raceway 12, and when grinding B raceway 14, consistent with the taper direction of B raceway 14.