Method for producing a camshaft for an internal-combustion engine
AssigneeC.R.F. Societa Consortile per Azioni
InventorsMarco COLOSSEO, Daniele BASSAN
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Abstract
A method for obtaining a camshaft for an internal-combustion engine having a structure made of a single piece includes obtaining the camshaft by starting from a metal tubular element. The cams are obtained by expanding the tubular element within a die using high-pressure fluid. The tubular element can have an enlarged thickness in portions that are to form the cams. Forming with high-pressure fluid can be obtained using gas or liquid (for example, water or oil) at high pressure, at room temperature or at a higher temperature. The piece obtained is subjected to thermal treatment and to a grinding operation.
Claims12
A method for producing a camshaft for an internal-combustion engine, the method comprising:
- expanding a metal tubular element by introducing a high-pressure fluid therein,
- wherein the camshaft is obtained in a single piece,
- forming the cams by expansion of the tubular element within a die;
- wherein said die where the forming operation using high-pressure fluid is performed has a main cylindrical cavity for receiving said tubular element, said main cavity having widened portions set axially apart from one another, for fainting the cams of the camshaft, and the tubular element set within said die before the forming operation having an enlarged thickness in portions thereof that are to form the cams.
Dependencies are inferred from the claim text.