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Order to meet the performance requirements of the bearing, the ideal body should be in a high hardness, excellent toughness matrix scattered round the average particulate filled hard phase (common carbon compounds), since this must be a reasonable implementation of forging and heat treatment.
Bearing Forging: Forging The major impact of the bearing bodies are growing and the average materials and meticulous precision, as well as the formation of a reasonable distribution of the flow line.
1 high carbon boron steel forging: carbon high boron steels poor thermal conductivity, low range, variant resistance, and forging a narrow temperature range (200 ℃ or so), it sprouted in the forging process tend to be larger internal coordinate force , not in a variant, easy forging crack. Thus forging should note the following essentials:
1) plus warm forging rapid cooling should take the average speed is not implemented. Rough to preheat the larger size when heated to always flip, dry sand to be placed after forging cooling
2) strict curb forging temperature range below the final forging temperature must be immediately returned to the furnace, the temperature rise should slow down and then forging hammer, and strive to hammer into a fire, the final forging temperature not higher than 1000 ℃, lest after forging grain stout.
3) forging, the tools of the fillet radius should be bigger, looks smooth and implemented to preheat, hammer off with hammer and anvil should be preheated to 200 ~ 300 ℃
4) hammering operation should master the "two light a heavy" (successively tapping, halfway to wham) and two average (the average of the local temperature, variant average) operation points to derogate from the internal coordinate force.
5) forgings to try to prevent punching and reaming, be sure Chongkuo hole punch taper unfit too large. Not one punch holes through the subject from the opposite central heating through the hole punch.
Note: Forged ratio: forging ratio is generally used to weigh stretching deflection, ie long before pulling a cross-sectional plane or surface size and after stretching transverse plane or the ratio of the size of the object surface. Standard forging ratio of variant 2-5, the metal fiber-forming groups, flash anisotropic mechanical properties; forging ratio greater than 5, the mechanical properties are no longer growing, anisotropy is further increased; profound and thorough in order to hammer forging Ton adequacy should be selected. Tonnage is too small, only in the appearance of variant implementation, forging quality does not improve cardiac unit. Tonnage is too large, too heavy pressure, easy forging crack. Forged high boron steel tonnage selection may refer to the following table. Forged alloy tool steel or low carbon tool steel, forging can increase the size or weight of the double
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7320ADB NSK | 100 | 215 | 47 |
| 7220CDB NSK | 100 | 180 | 34 |