Device for forming asymmetrical articles by rolling

• US 4,811,585 A
• Filed: 03/30/1987
• Issued: 03/14/1989
• Est. Priority Date: 04/02/1986
• Status: Expired due to Term

• Current Assignee: Mitsubishi Jukogyo Kabushiki Kaisha (Mitsubishi Heavy Industries, Ltd.), Nissan Motor Co., Ltd.
• Original Assignee: Mitsubishi Jukogyo Kabushiki Kaisha (Mitsubishi Heavy Industries, Ltd.), Nissan Motor Co., Ltd.
• Inventors: Takahashi, Ryoichi, Morimoto, Kazuo, Sato, Tomoyoshi, Tsukamoto, Hidehiko, Maeda, Nobutaka
• Primary Examiner(s): Crane, Daniel C.
• Application Number:
  US07/032,109
• Time in Patent Office: 715 Days
• Field of Search: 72/88, 72/90, 72/102, 72/108, 72/469, 29/6
• US Class Current: 72/108
• CPC Class Codes: B21H 1/18 cylinders, e.g. rolled transversely cross-rolling
• CPC Class Codes: B21H 1/22 characterised by use of rolls having circumferentially varying profile ; Die-rolling
• CPC Class Codes: Y10T 29/17 Crankshaft making apparatus
• CPC Class Codes: Y10T 29/49286 Crankshaft making

Abstract

A pair of dies are provided of which die faces are formed with depressions sequentially brought into engagement with a particular portion of a workpiece as the workpiece rolls between the die faces. By compressing the workpiece while driving the same to roll between the die faces, an excess metal of the workpiece is caused to flow into the depressions sequentially for thereby forming an asymmetrical part of the article.

Claims

1. A device for forming an asymmetrical article by rolling, comprising:

a plurality of driven cylindrical dies in fixed, spaced apart relation to each other between which an article may be clamped to be rolled as said dies are driven in opposite rotational directions, said dies being rotatable about parallel axis and having means for rotatably clasping said article about its axis so that the axis of said article extends parallel to said die axis, said dies each having die faces which are formed with circumferentially spaced independent patterns separated from each other in the direction of rolling of the article and capable of being sequentially brought into engagement with a particular portion of the article for thereby forming a part of the article at said particular portion, said part of the article being asymmetrical about the axis of the article.

12. A device according to claim 1 further comprising:

dies,

a plurality of pairs of said cylindrical

each of said cylindrical dies having a different independent pattern on the surface thereof and the pattern on each die of a pair being offset with respect to the pattern on the other die in the rolling direction.

2. A device for forming an asymmetrical article by rolling, comprising:

a pair of first and second cylindrical dies in fixed, spaced apart relation to each other, said dies having dies faces, means to drive said dies in opposite rotational directions, said dies being rotatable about parallel axis and having means for rotatably clasping said article about its axis so that the axis of said article extends parallel to said die axis, said dies each being formed with depressions on their faces which may be sequentially brought into engagement with a particular portion of an article as the article is rolled between said die faces;

said depressions of said first and second dies being separated from each other in the direction of rolling of the article and arranged at the same, constant pitch;

said depressions of said first die being arranged so as to differ in phase from said second die by an amount corresponding to about half revolution of the dies so that said depressions produce an asymmetrical shape of the article about the axis of the article.

3. A device as set forth in claim 2 wherein said depressions of said first and second dies are of different volume and the volume of the depressions of the second pair of dies is greater than the volume of the depressions in the first pair of dies.

6. A device for forming an asymmetrical article by rolling, comprising:

a pair of first and second cylindrical dies in fixed, spaced apart relation to each other, said dies having die faces, means to drive said dies in opposite directions, said dies being rotatable about parallel axis and having means for rotatably clasping said article about its axis so that the axis of said article extends parallel to said die axis, said dies each being formed with alternate depressions and projections on said die faces which are, sequentially brought into engagement with a particular portion of an article as the article rolls between said die faces;

said projections of said first and second dies being separated from each other in the direction of rolling of the article and arranged at the same, constant pitch;

said depressions and projections of said first die being so formed as to differ in phase from said depressions and projections of said second die by the amount corresponding to about half revolution of the dies so that said depressions and projections produce an asymmetrical shape of the article about the axis of the article .

4. A device as set forth in claim 8 wherein said depressions of said first and second dies are of different volume and the volume of the depressions in the second pair of dies is less than the volume of the depressions in the first pair of dies.

5. A device as set forth in claim 8 wherein each of said die faces is formed with a pair of first working sections in the form of ridges and a second working section between said pair of first working sections which is lower in height, said second working section also being formed with depression and being provided with an inclination.

7. A device as set forth in claim 6 wherein said depression and projections of said first and second dies are of different volume.

8. A device as set forth in claim 7 wherein each of said projections has an angled top which are of the same inclination.

9. A device as set forth in claim 8 wherein said article has a pair of concentric smaller diameter sections and an eccentric larger diameter section between said concentric smaller diameter sections, each of said die faces having a pair of first working sections in the form of ridges for forming said concentric smaller diameter sections and a second working section between said first working sections and constituted by said depressions and projections for forming said larger diameter section, said projections being generally lower in height than said first working section.

10. A device as set forth in claim 8 wherein said article has a pair of concentric shaft sections and an eccentric shaft section between said concentric shaft sections, which shaft sections are all of the same diameter, each of said die faces having a pair of first working sections in the form of a flat surface for forming said concentric shaft sections and a second working section between said first working sections and constituted by said depressions and projections for forming said eccentric shaft section, said projections being generally higher in height than said first working sections.

11. A device for forming an asymmetrical article by rolling comprising:

at least one pair of generally cylindrical dies in fixed, spaced apart relation to each other,

means to drive said cylindrical dies in opposite clockwise and counterclockwise rotation, respectively, each cylindrical die having a different independent pattern on the surface thereof, said dies being rotatable about parallel axis and having means for rotatably clasping said article about its axis so that the axis of said article extends parallel to said die axis,

the pattern on one die being circumferentially offset with respect to the pattern on the other die in the rolling direction and being so configured as to be capable of producing an asymmetrical cross section on an article about its axis while being driven between said dies.