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US 5,295,381 AGranted
Twist-forming press for crank shaft or the like
AssigneeSumitomo Heavy Industries, Ltd.
InventorsJunji Nishikawa, Hiromichi Konishi, Masashi Tado, Yasumasa Sato
Life of this patent
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Abstract
A twist-forming process and a coining process for a crank shaft are carried out by using one twist-forming press including a twist forming section and a coining section, and a stopper height adjusting means for determining the crank pin arrangement and for finely adjusting the twist angles is integrally incorporated into the twist-forming press.
Claims11
A twist-forming press for a crank shaft, comprising:
- a press frame including a bed and first and second main cylinders each having a ram disposed in said press frame;
- a slide connected with tip portions of each of the rams;
- upper and lower twist-forming dies arranged between said slide and the bed of said press frame, said upper and lower twist-forming dies being operatively connected to said slide so as to clamp a workpiece in conjunction with sliding movement of said slide, said upper and lower twist-forming dies having opposed twist-forming surfaces with the opposed surfaces having a centerline;
- means for rotating said upper and lower twist-forming dies to twist said workpiece clamped therebetween;
- and
- upper and lower coining dies arranged between said slide and the bed of said press frame, said upper and lower coining dies being operatively connected to said slide so as to pressingly close with each other in conjunction with the sliding movement of said slide, said upper and lower coining dies having opposed coining surfaces with the opposed surfaces having a centerline, said centerline of said upper and lower twist-forming dies being positioned to be in line with an axial centerline of the first main cylinder and said centerline of said upper and lower coining dies being positioned to be in line with an axial centerline of the second main cylinder.
3 more elements
A twist-forming and coining press system, comprising:
- a press frame including a bed, and first and second main cylinders each having a ram;
- a slide connected with tip portions of each of the rams so as to be slidingly connected in said press frame;
- a twist-forming die assembly including upper and lower retainers rotatively mounted to said slide and the bed of said press frame, respectively, and upper and lower twist-forming dies each fixedly held in the upper and lower retainers, respectively, the upper retainer being operatively connected to said slide such that the upper and lower twist-forming dies clamp a workpiece in conjuction with sliding movement of said slide, said upper and lower twist-forming dies having opposed twist-forming surfaces with the opposed surfaces having a centerline;
- means for rotating the upper and lower retainers to twist said workpiece clamped between said upper and lower twist-forming dies;
- and
- a coining die assembly including upper and lower coining dies positioned between said slide and the bed of said press frame, the upper and lower coining dies being operatively connected to said press frame so as to pressingly close with each other in conjunction with the sliding movement of said slide, said upper and lower coining dies having opposed coining surfaces with the opposed surfaces having a centerline, said centerline of said twist-forming die assembly being positioned to be in line with an axial centerline of the first main cylinder and said centerline of said coining die assembly being positioned to be in line with an axial centerline of the second main cylinder.
3 more elements
Dependencies are inferred from the claim text.