Method of producing split bearing rings
AssigneeNTN Toyo Bearing Co., Ltd.
InventorsNoriyuki Tsushima, Toshiharu Hirose
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Abstract
A method of splitting bearing rings in a direction obliquely crossing their axes. This method comprises forming a notch of substantially V-shaped cross-section in the inner or outer peripheral surface of a bearing ring obliquely or in a V-direction, or forming a notch of substantially V-shaped cross-section in an end surface of a bearing ring at a predetermined angle with respect to the surface, heat-treating the bearing ring, and exerting wedge stress along the notch by a wedge type press-breaking tool.
Claims4
A method of producing a metal split bearing ring, said method comprising:
- (a) forming a notch in one of the edge surfaces of said ring, said notch including at least a first portion having a V-shaped cross-section, wherein the axis bisecting the angle of the V is at an oblique direction with the axis of said ring;
- (b) heat treating said metal ring to harden said metal ring to a hardness H.sub.RC .gtoreq.50;
- (c) applying a wedge stress along said notch using a wedge type pressure-breaking means having a wedge angle, wherein the angle of the wedge of the breaking means is between 20.degree. and 60.degree. and is greater than the angle of the V-shaped cross-section of said notch, whereby said ring is split along said notch.
A method of producing a split metal bearing ring, said method comprising:
- (a) forming a first notch in one of the edge surfaces of said ring, said notch including at least a first portion having a V-shaped cross-section, wherein the axis bisecting the angle of the V is at an oblique direction with the axis of said ring;
- (b) forming a second notch in the other edge surface of the ring, said second notch including at least a first portion having a V-shaped cross-section, wherein the axis bisecting the angle of the V is at second oblique direction with the axis of said ring and wherein the axis bisecting the V's of the first and second notches intersect at a point on the peripheral surface of the ring between the edges of said ring;
- (c) forming a crack stopping hole through the peripheral surfaces of said ring at the point where the axes of the V's intersect;
- (d) heat treating said ring;
- (e) applying a wedge stress along said notches using a wedge type pressure breaking means, wherein the angle of the wedge of the breaking means is greater than the angle of the V-shaped cross-section of said notches, whereby said ring is split along said notches stopping at said crack stopping hole.
Dependencies are inferred from the claim text.