Vane and method for producing same
AssigneeHitachi Metals, Ltd.
InventorFujio Yamane
Life of this patent
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Abstract
The vane 1 is substantially in a flat rectangular parallelepiped shape having (a) two wide side surfaces 1c, 1c′ opposing in the thickness direction and being slidable in each guide groove 12 of a rotor 11 of an actuator, (b) two narrow side surfaces 1d, 1d′ opposing in the width direction, (c) an as-cold-worked top surface 1a having an arcuately projecting cross section in a plane perpendicular to the width direction and being in slidable contact with a cam surface 14 of the actuator 13 for sealing, and (d) a bottom end surface 1e opposing the top surface 1a, both ends of said top surface 1a in the width direction being bulging toward the cam surface 14.
Claims5
A method for producing a vane substantially in a flat rectangular parallelepiped shape having (a) two wide side surfaces opposing in the thickness direction, (b) two narrow side surfaces opposing in the width direction, (c) an as-cold-worked top surface having an arcuately projecting cross section in a plane perpendicular to the width direction, and (d) a bottom end surface opposing the top surface, both ends of said top surface in the width direction being bulging in a direction perpendicular to the width direction, comprising the steps of:
- (1) cold-working a flat bar by a roll die to provide the flat bar with substantially the same cross section as that of said vane, whereby the cold-worked flat bar has an arcuately projecting top surface with necessary precision in straightness and surface smoothness in a substantially as-cold-worked state;
- (2) shear-cutting said flat bar to a predetermined length in the thickness direction, thereby causing both ends of said top surface in the width direction to bulge in a direction perpendicular to the width direction;
- and
- (3) grinding both shear-cut surfaces of the resultant vane to such an extent that as high bulging as 1-10 μm remains at both ends of said top surface.
Dependencies are inferred from the claim text.