Back to results
US 5,203,397 AGranted
Heating assembly for a die-casting machine
AssigneeHotset Corporation
InventorSrekumar Bandyopadhyay
Life of this patent
Estimating the term…
Abstract
A nozzle body of stainless steel surrounded by a single layer of turns of a strip electrical heater interconnects a die caster and a sprue of a cluster of casting cavities in a die casting apparatus. The heating element is surrounded by a protective tube and the ends of the gap between the protective tube and the nozzle body are closed by annular members.
Claims9
A die-casting apparatus, comprising:
- a die caster for producing a material stream of a molten metal selected from the group which consists of zinc and magnesium, said die caster having an internally conical seat;
- a tubular nozzle body formed with a passage for conducting said material stream, an externally conical end receivable in and adapted to be wedged into said seat, and an internally conical recess at an opposite axial end of said body;
- a die having a sprue and formed with a mouthpiece engaging in said recess and receiving said stream;
- an electrical heating element in a form of a strip wrapped around an outer surface of said nozzle body in a multiplicity of turns in a single layer;
- a thin-wall protective tube slid axially over said layer and defining an axially extending gap with said tubular nozzle body, said turns being secured between said protective tube and said nozzle body;
- and
- respective annular members closing opposite axial ends of said gap and bonded to both an inner wall of said tube and said nozzle body, said strip having a greater number of turns per unit length at each end of said protective tube than between said ends of said protective tube.
4 more elements
A die-casting apparatus, comprising:
- a die caster for producing a material stream of a molten metal selected from the group which consists of zinc and magnesium, said die caster having an internally conical seat;
- a tubular nozzle body formed with a passage for conducting said material stream, an externally conical and receivable in and adapted to be wedged into said seat, and an internally conical recess at an opposite axial end of said body;
- a die having a sprue and formed with a mouthpiece engaging in said recess and receiving said stream;
- an electrical heating element in a form of a strip wrapped around an outer surface of said nozzle body in a multiplicity of turns in a single layer;
- a thin-wall protective tube slid axially over said layer and defining an axially extending gap with said tubular nozzle body, said turns being secured between said protective tube and said nozzle body;
- and
- respective annular members closing opposite axial ends of said gap and bonded to both an inner wall of said tube and said nozzle body, said nozzle body having a wall thickness which is substantially ten times the wall thickness of said protective tube in a region of said nozzle body surrounded by said protective tube.
4 more elements
A die-casting apparatus, comprising:
- a die caster for producing a material stream of a molten metal selected from the group which consists of zinc and magnesium, said die caster having an internally conical seat;
- a tubular nozzle body formed with a passage for conducting said material stream, an externally conical end receivable in and adapted to be wedged into said seat, and an internally conical recess at an opposite axial end of said body;
- a die having a sprue and formed with a mouthpiece engaging in said recess and receiving said stream;
- an electrical heating element in a form of a strip wrapped around an outer surface of said nozzle body in a multiplicity of turns in a single layer;
- a thin-wall protective tube slid axially over said layer and defining an axially extending gap with said tubular nozzle body, said turns being secured between said protective tube and said nozzle body;
- respective annular members closing opposite axial ends of said gap and bonded to both an inner wall of said tube and said nozzle body;
- and a thermocouple in a region enclosed by said protective tube.
4 more elements
Dependencies are inferred from the claim text.