Method of forming an integral tubular projection in a work by spinning and a product produced by the same
AssigneeNissan Motor Co., Ltd.
InventorsMasaaki Yoshitome, Masayuki Suzuki
Life of this patent
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Abstract
A method of forming an integral tubular projection in a disk-shaped work by spinning is provided. In the method, h=0.1 to 0.5t, d=0.25 to 0.94D, T=0.5 to 7h, and V=0.029 to 0.234πD2h where h is a depth by which a forming roller cuts into the work, t is a thickness of the work, d is an outer diameter of the tubular projection, D is a diameter of a circle including a point where the spinning by the forming roller starts, T is a thickness of a wall of the tubular projection, and V is a volume of the tubular projection. A product produced by the above method is also provided.
Claims15
A method of forming an integral tubular projection in a disk-shaped work by spinning, the work having a flat plate portion, the method comprising:
- driving the work to rotate in such a manner that the flat plate portion is held positioned on a plane;
- and
- spinning the work by using a forming roller whose axis is inclined to form a predetermined angle with an axis of rotation of the work, in such a manner as to cause a section of the work to decrease in thickness and another section of the work to increase in thickness and grow to the tubular projection;
- wherein:
- h=0.1 to 0.5t;
- d=0.25 to 0.94D
- T=0.5 to 7h;
- and
- V=0.029 to 0.234πD2h
- where h is a depth by which the forming roller cuts into the work, t is a thickness of the work, d is an outer diameter of the tubular projection, D is a diameter of a circle including a point where the spinning by the forming roller starts, T is a thickness of a wall of the tubular projection, and V is a volume of the tubular projection.
A method of forming an integral tubular projection in a disk-shaped work by spinning, comprising:
- forming the work into a shallow dish shape, the shallow dish-shaped work having a central portion where the projection is to be formed and an inclined wall portion surrounding the central portion;
- supporting the shallow dish-shaped work on a mandrel which is shaped correspondingly to the shallow dish-shaped work;
- driving the shallow dish-shaped work to rotate about an axis thereof together with the mandrel;
- and
- pushing a forming roller against the inclined wall portion of the work while moving the roller along the inclined wall portion and thereby causing the inclined wall portion to partially decrease in thickness and the central portion to partially increase in thickness and grow to the tubular projection;
- wherein an inclination of the inclined wall portion of the work ranges from 5 to 40 degrees.
A method of forming a circular part having an integral, concentric boss in the form of a hollow cylindrical projection, by spinning, comprising:
- preparing a circular work;
- holding the work between a mandrel and a tail stock and driving the work to rotate;
- and
- pushing a forming roller against the work and moving the forming roller toward an axis of rotation of the work, and thereby causing a radially outer section of the work to decrease in thickness and a radially inner section of the work to increase in thickness and grow to the boss while holding an inner circumferential surface of the boss apart from an outer circumferential surface of the tail stock;
- wherein the work is a flat circular plate without any prepared hole, the mandrel having a circular recess for positioning the work in place thereon.
A product produced a method of forming a circular part having an integral, concentric boss in the form of a hollow cylindrical projection, by spinning, comprising:
- preparing a circular work;
- holding the work between a mandrel and a tail stock and driving the work to rotate;
- and
- pushing a forming roller against the work and moving the forming roller toward an axis of rotation of the work, and thereby causing a radially outer section of the work to decrease in thickness and a radially inner section of the work to increase in thickness and grow to the boss while holding an inner circumferential surface of the boss apart from an outer circumferential surface of the tail stock;
- wherein the work is a flat circular plate without any prepared hole, the mandrel having a circular recess for positioning the work in place thereon.
A product produced by a method of forming an integral tubular projection in a disk-shaped work by spinning, the method comprising:
- forming the work into a shallow dish shape, the shallow dish-shaped work having a central portion where the projection is to be formed and an inclined wall portion surrounding the central portion;
- supporting the shallow dish-shaped work on a mandrel which is shaped correspondingly to the shallow dish-shaped work;
- driving the shallow dish-shaped work to rotate about an axis thereof together with the mandrel;
- and
- pushing a forming roller against the inclined wall portion of the work while moving the roller along the inclined wall portion and thereby causing the inclined wall portion to partially decrease in thickness and the central portion to partially increase in thickness and grow to the tubular projection;
- wherein an inclination of the inclined wall portion of the work ranges from 5 to 40 degrees.
A produce produced by a method of forming an integral tubular projection in a disk-shaped work by spinning, the work having a flat plate portion, the method comprising:
- driving the work to rotate in such a manner that the flat plate portion is held positioned on a plane;
- and
- spinning the work by using a forming roller whose axis is inclined to form a predetermined angle with an axis of rotation of the work, in such a manner as to cause a section of the work to decrease in thickness and another section of the work to increase in thickness and grow to the tubular projection;
- wherein:
- h=0.1 to 0.5t;
- d=0.25 to 0.94D;
- T=0.5 to 7h;
- and
- V=0.029 to 0.234πD2h
- where h is a depth by which the forming roller cuts into the work, t is a thickness of the work, d is an outer diameter of the tubular projection, D is a diameter of a circle including a point where the spinning by the forming roller starts, T is a thickness of a wall of the tubular projection, and V is a volume of the tubular projection.
Dependencies are inferred from the claim text.