A double-sided ultrasonic rolling cooperative strengthening system and a control method thereof are provided. The system includes a first mechanical arm subsystem, a second mechanical arm subsystem, a first ultrasonic rolling strengthening subsystem, a second ultrasonic rolling strengthening subsystem and a servo turntable (13); the servo turntable (13) is configured to fix a blade to be processed; the first ultrasonic rolling strengthening subsystem is provided at an end of the first mechanical arm subsystem; and the second ultrasonic rolling strengthening subsystem is provided at an end of the second mechanical arm subsystem. The way that the mechanical arm is equipped with an ultrasonic rolling strengthening device improves a degree of freedom of processing the blade, and the first mechanical arm subsystem, the second mechanical arm subsystem, the first ultrasonic rolling strengthening subsystem, the second ultrasonic rolling strengthening subsystem and the servo turntable (13) are provided to cooperate to realize double-sided processing.

A double-sided ultrasonic rolling cooperative strengthening system and a control method thereof are provided. The system includes a first mechanical arm subsystem, a second mechanical arm subsystem, a first ultrasonic rolling strengthening subsystem, a second ultrasonic rolling strengthening subsystem and a servo turntable (13); the servo turntable (13) is configured to fix a blade to be processed; the first ultrasonic rolling strengthening subsystem is provided at an end of the first mechanical arm subsystem; and the second ultrasonic rolling strengthening subsystem is provided at an end of the second mechanical arm subsystem. The way that the mechanical arm is equipped with an ultrasonic rolling strengthening device improves a degree of freedom of processing the blade, and the first mechanical arm subsystem, the second mechanical arm subsystem, the first ultrasonic rolling strengthening subsystem, the second ultrasonic rolling strengthening subsystem and the servo turntable (13) are provided to cooperate to realize double-sided processing.

In a blowout preventer body having a central bore a method of reducing the size and weight of the blowout preventer body while maintaining an acceptable stress level at working pressure comprising machining a portion of the blowout preventer body to proximate the final dimensions, pressuring the blowout preventer body to a higher pressure than the working pressure of the blowout preventer body to yield high stress areas of the blowout preventer body, and relieving the higher pressure from the blowout preventer body such that when the blowout preventer body returns to the non-pressured state the high stress areas will retain compressive stresses and when the blowout preventer body is then pressurized to the working pressure of the blowout preventer body the stresses will be at an acceptable stress level.

In a blowout preventer body having a central bore a method of reducing the size and weight of the blowout preventer body while maintaining an acceptable stress level at working pressure comprising machining a portion of the blowout preventer body to proximate the final dimensions, pressuring the blowout preventer body to a higher pressure than the working pressure of the blowout preventer body to yield high stress areas of the blowout preventer body, and relieving the higher pressure from the blowout preventer body such that when the blowout preventer body returns to the non-pressured state the high stress areas will retain compressive stresses and when the blowout preventer body is then pressurized to the working pressure of the blowout preventer body the stresses will be at an acceptable stress level.

A mechanical surface treatment method for a workpiece includes using a multi-axis powered machine to actuate a deep rolling tool having a roller relative to the workpiece. The actuating includes applying the roller against a workpiece surface with a normal force sufficient to plastically deform the workpiece and translating the roller relative to the workpiece surface. The method includes concurrently applying an electrical current to the workpiece surface in a manner that produces an electroplastic effect at the workpiece surface and a near surface region. The electroplastic effect and the plastic deformation produce a refinement in a grain structure at the workpiece surface and near surface region and an increase in dislocation sources and tangles within the grain structure.

A mechanical surface treatment method for a workpiece includes using a multi-axis powered machine to actuate a deep rolling tool having a roller relative to the workpiece. The actuating includes applying the roller against a workpiece surface with a normal force sufficient to plastically deform the workpiece and translating the roller relative to the workpiece surface. The method includes concurrently applying an electrical current to the workpiece surface in a manner that produces an electroplastic effect at the workpiece surface and a near surface region. The electroplastic effect and the plastic deformation produce a refinement in a grain structure at the workpiece surface and near surface region and an increase in dislocation sources and tangles within the grain structure.

A bearing assembly having an inner race ring (14) that defines an inner raceway and an outer race ring that defines an outer raceway on which the plurality of rolling elements (22) roll. The bearing raceways are machined using surface finishing operations to create preferred surface profiles and textures for improving lubrication performance. The profile of the raceway is initially created using a first grinding process to form a rough surface profile including a rough central band (34) and rough recessed side bands (38). A second grinding process is used to smooth the central band. This raceway surface profile increases lubrication performance.

A bearing assembly having an inner race ring (14) that defines an inner raceway and an outer race ring that defines an outer raceway on which the plurality of rolling elements (22) roll. The bearing raceways are machined using surface finishing operations to create preferred surface profiles and textures for improving lubrication performance. The profile of the raceway is initially created using a first grinding process to form a rough surface profile including a rough central band (34) and rough recessed side bands (38). A second grinding process is used to smooth the central band. This raceway surface profile increases lubrication performance.

An apparatus for smoothing an inner toothing and/or an outer toothing of a component part. At least two radially adjustable smoothing gears, which engage in the inner toothing and/or outer toothing, are rotatably arranged inside the inner toothing and/or outside of the outer toothing. During smoothing, the component part is not firmly clamped but rather only rests loosely on a support. A thrust ring is provided at least at one of the smoothing gears for limiting axial movements of the component part, which occur during smoothing.

An apparatus for smoothing an inner toothing and/or an outer toothing of a component part. At least two radially adjustable smoothing gears, which engage in the inner toothing and/or outer toothing, are rotatably arranged inside the inner toothing and/or outside of the outer toothing. During smoothing, the component part is not firmly clamped but rather only rests loosely on a support. A thrust ring is provided at least at one of the smoothing gears for limiting axial movements of the component part, which occur during smoothing.