Arrangement for fabricating double conical springs
AssigneeEstel Hoesch Werke Aktiengesellschaft
InventorsErnst Kirchhoff, Alfred Rander, Gunter Adolf
Life of this patent
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Abstract
An arrangement for producing double conical springs from heated rod-shaped material, in which one side of a conical-shaped spring is formed with a cylindrical end corresponding to the largest winding diameter. The end is then shaped to a conical form. After being transferred from a spring winding station to an end roll-in unit, the spring is clamped, and a shaping member is inserted radially into the spring, and moved against a stop. With the aid of a roll-in head, the cylindrical spring end is conically formed. After the shaping member is radially removed from the spring, the latter is released and transported to a hardening process.
Claims11
A method for producing double conical springs having a largest winding diameter located between ends of the springs, comprising the steps of:
- heating wire-shaped material;
- winding said wire-shaped material on a mandrel having a cylindrical portion and a conical end, so that gaps of space are left between wound coils;
- removing said mandrel to leave a semi-finished spring having a cylindrically wound portion joined to a first conically wound end portion, said semi-finished spring having an interior profile corresponding substantially to the outer profile of said mandrel;
- clamping one end of said cylindrically wound portion to a roll-in unit;
- clamping and holding a coil of said semi-finished spring which is to remain cylindrical in the double conical spring when finished, the cylindrical portion of said semi-finished spring between said clamped one end and said cylindrical coil being formed to a second conically wound portion by said roll-in unit;
- inserting a shaping member radially into the interior space of said cylindrically wound portion by passing said shaping member through at least one gap between coils and moving said shaping member axially against said roll-in unit;
- holding said shaping member stationary against said roll-in unit;
- rotating said roll-in unit through a predetermined angle and moving said one end clamped to said roll-in unit inwardly toward the interior of said cylindrically wound portion so that said cylindrically wound portion is wound onto said shaping member for deforming said cylindrically wound portion into said second conically wound portion, said cylindrical coil being located between said first conically wound portion and said second conically wound portion;
- and removing said shaping member from the interior of said second conically wound portion by passing said shaping member through at least one gap between coils to the exterior of the spring.
Apparatus for producing double conical springs having a largest winding diameter located between ends of the springs, comprising:
- means for heating wire-shaped material;
- means for winding said wire-shaped material on a mandrel having a cylindrical portion and a conical end, so that gaps of space are left between wound coils;
- means for removing said mandrel to leave a semi-finished spring having a cylindrically wound portion joined to a first conically wound end portion, said semi-finished spring having an interior profile corresponding substantially to the outer profile of said mandrel;
- means for clamping one end of said cylindrically wound portion to a roll-in unit;
- means for clamping and holding a coil of said semi-finished spring which is to remain cylindrical in the double conical spring when finished, the cylindrical portion of said semi-finished spring between said clamped one end and said cylindrical coil being formed to a second conically wound portion by said roll-in unit;
- means for inserting a shaping member radially into the interior space of said cylindrically wound portion by passing said shaping member through at least one gap between coils and moving said shaping member axially against said roll-in unit;
- means for holding said shaping member stationary against said roll-in unit;
- means for rotating said roll-in unit through a predetermined angle and moving said one end clamped to said roll-in unit inwardly toward the interior of said cylindrically wound portion so that said cylindrically wound portion is wound onto said shaping member for deforming said cylindrically wound portion into said second conically wound portion, said cylindrical coil being located between said first conically wound portion and said second conically wound portion;
- and means for removing said shaping member from the interior of said second conically wound portion by passing said shaping member through at least one gap between coils to the exterior of the spring.
Dependencies are inferred from the claim text.