Method of producing outer ring of self- alinging bearing
OwnerYoshikazu Kurashita, Takehiro Adachiinventors
Life of this patent
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Abstract
To provide a method of producing an outer ring of a self-aligning bearing in which at a raceway-turning step after a heat treatment, the chipping of a turning tool and damage of a raceway can be prevented. Before the heat treatment, an annular groove 2b is formed in that portion of the raceway 2a of the outer ring 2 corresponding to lubrication holes 7, thereby avoiding a situation in which a discontinuous cutting operation occurs because of the lubrication holes 7 at the raceway-turning step after the heat treatment.
Claims3
A method of producing an outer ring of a self-aligning bearing, comprising:
- a first turning step of turning an annular stock to form a blank having a predetermined machining allowance formed at a raceway;
- a boring step of forming lubrication holes in said blank which lubrication holes are open to the raceway and an outer periphery of the blank;
- a heat treatment step of hardening the blank, having said lubrication holes formed therein, to predetermined hardness;
- and
- a second turning step of turning said raceway after the heat treatment step;
- characterized in that:
- before said heat treatment step, a turning operation is applied to that portion of said raceway corresponding to the lubrication holes to form an annular groove for avoiding a situation in which a discontinuous cutting operation occurs at said second turning step because of said lubrication holes.
A method of producing an outer ring of a self-aligning bearing, comprising:
- a first turning step of turning an annular stock to form a blank having a predetermined machining allowance formed at a raceway;
- a boring step of forming lubrication holes in said blank which lubrication holes are open to the raceway and an outer periphery of the blank;
- a heat treatment step of hardening the blank, having said lubrication holes formed therein, to predetermined hardness;
- a second turning step of turning said raceway after the heat treatment step while leaving a grinding allowance;
- and
- a grinding step of grinding the raceway for finishing purposes after the second turning step;
- characterized in that:
- before said heat treatment step, a turning operation is applied to that portion of said raceway corresponding to the lubrication holes to form an annular groove for avoiding a situation in which a discontinuous cutting operation and a discontinuous
- grinding operation occur respectively at said second turning step and said grinding step because of said lubrication holes.
A method of producing an outer ring of a self-aligning bearing, comprising:
- a turning step of turning an annular stock to form a blank having a predetermined grinding allowance formed at a raceway;
- a boring step of forming lubrication holes in said blank which lubrication holes are open to the raceway and an outer periphery of the blank;
- a heat treatment step of hardening the blank, having said lubrication holes formed therein, to predetermined hardness;
- and
- a grinding step of grinding the raceway for finishing purposes after the heat treatment step;
- characterized in that:
- before said heat treatment step, a turning operation is applied to that portion of said raceway corresponding to the lubrication holes to form an annular groove for avoiding a situation in which a discontinuous grinding operation occurs at said grinding step because of said lubrication holes.
Dependencies are inferred from the claim text.