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AssigneeKoyo Seiko Co., Ltd.
InventorsYoshiki Fujita, Hajime Tazumi, Kazuyuki Nishikita, Hideji Yoshida
Estimating the term…
A method of manufacturing a steel ball for a rolling bearing, said method comprising: a molding step of forming a steel wire cut at a predetermined length into a raw ball having a band portion by a pair of molding forms having respectively hemispherical concave portions and relief grooves in peripheries of said concave portions on their respective opposing faces, said band portion being formed on a surface of said raw ball along said relief grooves by compressing said steel wire by said molding forms in a state in which both ends of said steel wire are sandwiched between said concave portions; and a tumbler working step of removing said band portion from the surface of the raw ball by tumbling.
A method of manufacturing a steel ball for a rolling bearing, said method comprising:
A method of manufacturing a steel ball for a rolling bearing, said method comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Parts of ball or roller bearings: balls
Making machine elements: balls, rolls, or rollers, e.g. for bearings
Making specific metal objects by operations not covered by a single other
Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor: for grinding balls
Term ended 27 Jun 2022 (estimated)
The present invention relates to a method of manufacturing a steel ball for a rolling bearing using a pair of molding forms.
In manufacturing a steel ball for a rolling bearing, such molding forms are disposed opposing to each other. The molding forms have respectively hemispherical concave portions on the opposing faces thereof, coupling faces in peripheral edges of the concave portions, and relief grooves formed in the peripheries of the concave portions.
The method of manufacturing the steel ball will be described. A steel wire having a required wire diameter is provided. A fiber flow exists in a lengthwise direction of the steel wire. The fiber flow is constituted by a number of fiber type of metallic texture along with the lengthwise direction of the steel wire. The steel wire is cut at a constant length in accordance with the size of the steel ball to be manufactured.
These and other objects as well as advantages of the invention will become clear by the following description of preferred embodiments of the invention with reference to the accompanying drawings, wherein:
FIG. 1 is a flow chart of a manufacturing step of a steel ball for a rolling bearing according to a first preferred embodiment of the present invention.
FIG. 2 is a front elevational view of a steel wire cut at a predetermined length in a cutting step shown in FIG. 1;
In all these figures, like components are indicated by the same numerals
In reference to FIG. 1, a manufacturing method of a steel ball for a rolling bearing according to a first preferred embodiment of the invention comprises a cutting step 10, a molding step 11, a tumbler working step 12, a hardening and tempering step 13, a grinding step 14 and a wrapping step 15.
Cutting Step 10