Method of forming a tubular ring
a tubular ring and tube technology, applied in the direction of metal-working equipment, vehicle components, rims, etc., can solve the problems of high cost and quality, welded hoops can have problems in the weld area, and the cost of cutting seamless tubes is high
Inactive Publication Date: 2009-02-26
THE GATES CORP
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AI Technical Summary
Benefits of technology
The invention is a method of making a tubular ring by expanding the hole of a flat blank using a special roller. This roller is shaped like a tubular shaft and is engaged with the blank at an angle, then rotated to make the blank into a tubular ring with a smooth outer surface. The technical effect of this method is to make a tubular ring with a smooth outer surface that can be easily used in various applications.
Problems solved by technology
All of these processes are feasible, but variable cost and quality can present problems.
Welded hoops can have problems in the weld area when the ring is flow formed further to make certain products such as gears, pulleys, splined rings and so on.
Cut seamless tubes are expensive and making a cup in a press and removing the face creates excessive waste.
Method used
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[0015]FIG. 1 is a typical stress-strain curve for metal. In the case of spinning metal, each element the plastic region as shown in FIG. 1. Each element is in the plastic region for a very short period of time wherein the metal is formed with or without application of heat. The process repeats as many times as required until the part is formed into the desired shape.
[0016]This invention comprises a method of flow forming a flat blank by spinning into a ring. The ring can be used in making gears, pulleys, sprockets, bearing races, one-way clutch races and similar products.
[0017]FIG. 2 is a cross-section of the tool and mandrel. A circular flat blank 100 having a central opening 101 is mounted in shoulder 12 of tooling 10. Shoulder 12 can be as small as one or two millimeters and as large as desired to create an inverted “L” shaped cross section for the ring. Shoulder 12 has a diameter that is larger than a diameter of tooling bore 11. Blank 100 rests upon and is fully supported about...
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Abstract
A method of forming a tubular ring comprising spinning a flat blank having a bore, expanding the bore using a tubular shaft shaped spinning roller by initially engaging the tubular shaft shaped spinning roller with the flat blank bore at an angle (α) to the spinning axis, forming the flat blank into a tubular ring by rotating the tubular shaft shaped spinning roller about a center of rotation (B) such that the tubular shaft shaped spinning roller becomes substantially parallel to the spinning axis, and forming a contour on an outer surface of the tubular ring.
Description
FIELD OF THE INVENTION[0001]The invention relates to a method of forming a tubular ring comprising expanding the bore of a flat blank using a tubular shaft shaped line contact spinning roller.BACKGROUND OF THE INVENTION[0002]Spinning is a manufacturing process where a part is formed by being subjected to forming stresses applied by a roller (or rollers) many times over very small areas. Each element of metal is brought into the plastic region for a very short period of time during which it is formed. The process repeats as many times as required.[0003]Known processes for manufacturing tubular rings include making a tube and cutting it into rings, deep drawing a cup and removing the face of the cup, expanding a blank in ring rolling, forging, casting, or welding a strip to make a ring. All of these processes are feasible, but variable cost and quality can present problems. Welded hoops can have problems in the weld area when the ring is flow formed further to make certain products su...
Claims
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IPC IPC(8): B21D5/00
CPCB21D22/16B21D53/30B21D53/16
Inventor HODJAT, YAHYA
Owner THE GATES CORP