Abstract: A closed loop coolant system which ensures the isolation of coolant fluid within an apparatus for producing a metal container by wall ironing. The apparatus includes a die toolpack which reduces the thickness of the container side wall, a ram (5) and a ram guidance assembly (10) which guides the ram along a bore of a tubular assembly. The tubular assembly has a fluid inlet, and the surface of the bore of the tubular assembly has grooves (13) for passage of coolant fluid between the bore and around the outside of the ram (5) and seals for minimizing leakage of oil into the coolant. Coolant is directed back to a tank (20) via a heat exchanger (21) and any oil is skimmer off the coolant by an oil skimmer (24). This oil can then be filtered, cleaned and recycled, or disposed of.

Abstract: A closed loop coolant system which ensures the isolation of coolant fluid within an apparatus for producing a metal container by wall ironing. The apparatus includes a die toolpack which reduces the thickness of the container side wall, a ram 5 and a ram guidance assembly 10 which guides the ram along a bore of a tubular assembly. The tubular assembly has a fluid inlet, and the surface of the bore of the tubular assembly has grooves 13 for passage of coolant fluid between the bore and around the outside of the ram 5 and seals for minimising leakage of oil into the coolant. Coolant is directed back to a tank 20 via a heat exchanger 21 and any oil is skimmer off the coolant by an oil skimmer 24. This oil can then be filtered, cleaned and recycled, or disposed of.