Solve and prevent IKO bearings overheating
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The surface of the workpiece IKO bearing if the quality is bad, the corrosion resistance of workpiece will decline. When the IKO bearing can work seriously overheating will produce grain, and are very large, but also in the steel cable amount increases 8, easy to cause the deterioration of IKO bearing thermal processing properties. Lcrl8Ni9Ti stainless steel with body or flange when overheating, surface defects of orange peel.
Therefore, put forward the main measures to prevent the:
1 to strictly control the stainless steel body, flange forging heating temperature and holding time, prevent overheating workpiece workpiece generated coarse grain defect.
The forging process of 2 workpieces, such as forging ratio is too small, the final forging temperature is high, they are prone to coarse grain structure defects, should make the forging ratio appropriate, full, final forging temperature.
Heat treatment of 3.IKO bearing soluble solid processing temperature should not be too high, heat preservation time should not be too long, the heating temperature should not be higher than 1150 C, "by 1-1.5min / mm computing is appropriate holding time.
4 for those overheating organization thick workpiece, can use the method of forging grains refinement of the elimination of defects, in order to prevent the workpiece surface defect in cold deformation when the orange peel, thus improving the surface quality of workpiece.
IKO bearing precision points (main) dimensional accuracy and rotation accuracy. Precision has been standardized, divided into 0 levels, level 6X, level 6, level 5, level 4, level 2 of six grade. Accuracy was improved from 0 levels, level 0 is enough for general use, but in other conditions or situations, requires a level 5 or higher accuracy.
Precision grade above is based on the ISO standard formulation, but its name is different in national standards.
Size precision (with the shaft and the shell is arranged on the project)
The allowable deviation of 1, diameter, diameter, width and the width of the assembly
The allowable deviation of 2, roller group round diameter and outer round diameter
3, chamfer dimension admissible limit
4, the width of the permissible variation
The rotating precision (rotating body and beat related projects)
1, the inner ring and the outer ring allows for radial and axial runout
2, the inner ring to allow lateral runout
3, outer diameter surface inclination of the permissible variation
4, IKO thrust bearing raceway thickness allows variation
5, the conical hole deviation and permissible variation
234407BM 234706BM 234406BM 517/2860V/YA 5610/2500 517/1720X1V 527/1181M 510/1180M 517/930 510/670 590/560 510/500 52780 59080 517/368M 51760U 517/238 6207-2ZN 6206-2ZN 6205-2ZN 6204-2ZN 6203-RZ 6203-2ZN 6202N 6202-2ZN 6201-2ZN 6200ZZ 6200-2ZN 62/32-ZN 62/32-Z 62/32N 62/32-2Z 62/32-2RZ 62/32-2RS 62/28-2RZ 62/22-2RZ 61996 61992 61988 61984
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IKO bearings overheating solution as follows:The surface of the workpiece IKO bearing if the quality is bad, the corrosion resistance of workpiece will decline. When the IKO bearing can work seriously overheating will produce grain, and are very large, but also in the steel cable amount increases 8, easy to cause the deterioration of IKO bearing thermal processing properties. Lcrl8Ni9Ti stainless steel with body or flange when overheating, surface defects of orange peel.
Therefore, put forward the main measures to prevent the:
1 to strictly control the stainless steel body, flange forging heating temperature and holding time, prevent overheating workpiece workpiece generated coarse grain defect.
The forging process of 2 workpieces, such as forging ratio is too small, the final forging temperature is high, they are prone to coarse grain structure defects, should make the forging ratio appropriate, full, final forging temperature.
Heat treatment of 3.IKO bearing soluble solid processing temperature should not be too high, heat preservation time should not be too long, the heating temperature should not be higher than 1150 C, "by 1-1.5min / mm computing is appropriate holding time.
4 for those overheating organization thick workpiece, can use the method of forging grains refinement of the elimination of defects, in order to prevent the workpiece surface defect in cold deformation when the orange peel, thus improving the surface quality of workpiece.
IKO bearing precision points (main) dimensional accuracy and rotation accuracy. Precision has been standardized, divided into 0 levels, level 6X, level 6, level 5, level 4, level 2 of six grade. Accuracy was improved from 0 levels, level 0 is enough for general use, but in other conditions or situations, requires a level 5 or higher accuracy.
Precision grade above is based on the ISO standard formulation, but its name is different in national standards.
Size precision (with the shaft and the shell is arranged on the project)
The allowable deviation of 1, diameter, diameter, width and the width of the assembly
The allowable deviation of 2, roller group round diameter and outer round diameter
3, chamfer dimension admissible limit
4, the width of the permissible variation
The rotating precision (rotating body and beat related projects)
1, the inner ring and the outer ring allows for radial and axial runout
2, the inner ring to allow lateral runout
3, outer diameter surface inclination of the permissible variation
4, IKO thrust bearing raceway thickness allows variation
5, the conical hole deviation and permissible variation
