摘要:
A method for producing a housing for a hydrodynamic bearing apparatus includes forming a housing 7 which has a cylindrical shape and which includes a fixing face 7c for fixing the outer circumferential surface 8b of a bearing sleeve 8, and axial circulation grooves 7d for bringing both end faces 8c, 8d of the bearing sleeve 8 into circulation on the inner periphery. The method includes providing a groove molding portion 18a2 on the outer circumference of a rod 18 which serves as a forming mold for the inner periphery of the housing 7, and forming the circulation grooves 7d of the housing by forging with the groove molding portion 18a2 of the mold. Moreover, after a sealing face 107d and a cylindrical outer circumferential surface 107e provided on the outer periphery of the housing 107 are formed by forging, an inner circumferential surface 107c is formed by forging.
摘要:
A method for producing a housing for a hydrodynamic bearing apparatus includes forming a housing 7 which has a cylindrical shape and which includes a fixing face 7c for fixing the outer circumferential surface 8b of a bearing sleeve 8, and axial circulation grooves 7d for bringing both end faces 8c, 8d of the bearing sleeve 8 into circulation on the inner periphery. The method includes providing a groove molding portion 18a2 on the outer circumference of a rod 18 which serves as a forming mold for the inner periphery of the housing 7, and forming the circulation grooves 7d of the housing by forging with the groove molding portion 18a2 of the mold. Moreover, after a sealing face 107d and a cylindrical outer circumferential surface 107e provided on the outer periphery of the housing 107 are formed by forging, an inner circumferential surface 107c is formed by forging.
摘要:
A fluid lubrication bearing apparatus which can stably produce high bearing performance is provided at low costs. Moreover, a method for producing a housing for hydrodynamic bearing apparatuses which can improve the accuracy of form of the housing of this type at low costs is provided.In forming a housing 7 which has a cylindrical shape and comprises a fixing face 7c for fixing the outer circumferential surface 8b of a bearing sleeve 8, and axial circulation grooves 7d for bringing both end faces 8c, 8d of the bearing sleeve 8 into circulation on the inner periphery by forging, a groove molding portion 18a2 is provided on the outer circumference of a rod 18 which serves as a forming mold for the inner periphery of the housing 7, and the circulation grooves 7d are formed by forging with this groove molding portion 18a2. Moreover, after a sealing face 107d and a cylindrical outer circumferential surface 107e provided on the outer periphery of the housing 107 are formed by forging, an inner circumferential surface 107c is formed by forging. Accordingly, the thrust bearing face 107a is finished to have the perpendicularity with respect to the inner circumferential surface 107c or outer circumferential surface 107e of 20 μm or less. Moreover, the sealing face 107d is finished to have the coaxiality with respect to the inner circumferential surface 107c or outer circumferential surface 107e of 20 μm or less. Moreover, the outer circumferential surface 107e is finished to have the coaxiality with respect to the inner circumferential surface 107c of 20 μm or less.
摘要:
A device for expanding rotationally symmetrical shaped parts (16), including a divided expanding mold (1), a pressure die (11) and a pressurizing means (14), wherein a mold cavity (9) of the expanding mold (1) is defined in axial directions by continuous end faces (20,21) of two spaced annular molds (17,18) and in radial direction by an inner peripheral surface of two mold halves (2,3).
摘要:
Method for forming roller bearing cage lugs into roller retainers. Portions of the lugs provided on bearing cage webs are staked to a preselected depth and a desired retainer conformation in an overlying relationship with adjacent roller receiving pockets in the cage. A punch assembly which accommodates a pair of simultaneous staking operations is employed. The assembly includes a staking punch configured to stake portions of the same lug in opposite directions from each other overlying portions of adjacent receiving pockets or to stake portions of adjacent lugs in opposite directions toward each other overlying opposed sides of the same receiving pocket.
摘要:
A METHOD OF PRODUCING THIN-WALLED CYLINDRICAL SLEEVES ADAPTED FOR USE IN BEARINGS AND PROVIDED WITH PROFILES AND TO THE NOVEL SLEEVES PRODUCED BY THE SAID PROCESS.