Feeder will be sent to the crankshaft turn position spherical roller bearing is especially suitable for the overloaded or vibration load work, in central hole on both ends spire rough positioning, crankshaft right now along the axial still in the spring force under the action of floating state. Rolling pressure head into thrust end open files, rolling to head for the center axis counterclockwise certain Angle, make the wheel contact lateral wall, and adjust the crankshaft axial position, until both sides are by strict. Second, hydraulic device will be on both ends of the crankshaft top lock, workpiece axis to completely position, and left the card claw clamping shaft small head. Workpiece rotate, rose knife device, two point distance up big, turning to go forward, fine car two lateral wall. After completion, the tip of retract, blade to return to the starting position. Then, rolling again head into open files, rolling around the wheel shaft clockwise, closed in on both sides of the wall respectively, along with the rotation of the crankshaft, rolling with grinding wheel move thrust end, realize the thrust of the surface rolling processing.

Here, Qingdao rui fine bearing mechanical and electrical supply from stock cylindrical roller bearing one of the main purposes of pure car is to make the thrust end the distance between the design standard close to, and one for the next rolling provide a smaller roughness, in order to make rolled to more good effect. Here the rolling and the purpose of the crankshaft rounded rolling is different. The main purpose of the rolling round is to increase the residual stress in the round to offset the crankshaft part of tensile stress, round place to delay the crack growth, so as to improve the fatigue strength of the round place. Fine car rolled goal is to improve the surface roughness, so as to reduce the formation of crack speed. At the same time, rolling and improve thrust end of the hardness, wear resistance of the surface increases; Has produced certain residual stress, to thrust end of the fatigue life have a positive effect.

Fine cars rolling process, Qingdao red main business of the type of mechanical and electrical bearing of the center of the blades must be and car rolled the center is consistent, can appear otherwise on both sides of the rolling is consistent, influence rolling effect. After rolling processing thrust end of the surface quality better than grinding process of surface quality, especially organization density sex to improve, greatly improving the strength of its wear-resisting. Fine car after rolling is completed the thrust of the end face the whole processing.

Rolling to thrust end fatigue life influence

49 MnVS3 ductile cast iron

Rolling HRB 23 HRC before 83

After rolling 98 HRB 26 HRC

Fine car before and after rolling hardness variations

Fine car before and after rolling hardness change of such as table 1. Since the bearing the precise structure is not suitable for high pressure steam sterilization from table 1 can see, after rolling nodular cast iron crankshaft hardness increased by 18.1%, the MnVS3 49 of crankshaft hardness improved 13%. Most of the data shows, improve surface hardness able to different degree enhance the wear resistance of the surface. Therefore, the two kinds of material surface hardness rise, all in different degree enhance the thrust end wear resistance.

Fine car rolled around the change of roughness

 
Fine car rolled around the change of roughness, analyses bearing inner circle tilt relative to the outer factors after rolling of car surface roughness value reduced significantly, and about an order of magnitude reduced, and this undoubtedly greatly improve the fatigue strength of the surface. According to the principle of fracture mechanics, the larger the surface roughness, the greater the effect of incision, the fatigue performance is poor. This is because there is always a rough machining surface processing trace such as knife scar, crack, these tracks is equivalent to a lot of small gap, the parts in a work surface form stress concentration, usable theory stress concentration factor Kt said.



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