JPS57103733A - Manufacture of soft core type composite wire - Google Patents

Abstract

PURPOSE: To obtain a sound soft core type composite wire without causing breakage of core material by placing the tip of a point die in the rear of an extrusion die hole and making extrusion and covering specifying the relation between the outer diameter of core material and composite wire and the diameter of extrusion die hole.

CONSTITUTION: The tip of a point die 4 is placed in the rear of the hole of an extrusion die 3, and an outer layer material 2' is covered closely around a soft core material 1 in the hole of the extrusion die 3 to form a composite wire 5, and then extrusion is performed. At this time, extrusion and covering are made under conditions that satisfy the relation in the expression where (d) is outer diameter of the composite wire after extrusion and covering, D is diameter of the hole of the extrusion die 3, α is inclination of outer face of the point die 4, and (t) is clearance between the extrusion die 3 and point die 4. By these conditions, a soft core type composite wire that does not cause breakage of core material by extrusion pressure and does not form a gap between the core material 1 and extrusion pipe, and subsequent drawing is possible.

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