Forging apparatus
AssigneeGKN Forgings Limited
InventorsRobert M. Gardner, Ronald L. Thompson
Life of this patent
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Abstract
A forging press for producing flashless forgings from metal billets or pre-forms has a die-head (26) slidably mounted in a press-head (10) whereby it may retract into the press-head if a predetermined pressure on the die-head is reached or exceeded during the forging stroke. The die-head (26) is slidably mounted in a bore (30) containing hydraulic fluid and connected via conduits (38) and pressure relief valves (40) to a hydraulic reservoir (32). A die cavity for the billet or pre-form is defined between relatively movable die halves (16) and (18).
Claims13
An improved mechanical crank press for the production of flashless forgings from metal billets or pre-forms wherein the press comprises a die assembly defining a die cavity, a press-head reciprocable towards and away from the die assembly and a die-head carried on the press-head to be co-operable, during a forging stroke, with the die assembly to forge a metal billet or pre-form located in the die cavity to a shape corresponding to the shape bounded by the die cavity and the die-head;
- the die assembly being openable and closable;
- releasable locking means to lock the die assembly in its closed condition during the forging stroke of the press;
- the die-head being movable axially towards the press-head;
- and fluid pressure means for maintaining the die-head in a fully extended position outward from the press-head at a predetermined maximum fluid pressure during the forging stroke but when the pressure on the die-head during a forging stroke exceeds said maximum pressure said die-head reciprocates axially relative to and toward the press-head to protect the die-head and prevent press stalling.
An improved mechanical crank press for the production of flashless forgings from metal billets or pre-forms wherein the press comprises a die assembly defining a die cavity, a press-head reciprocable towards and away from the die assembly and a die-head carried on the press-head to be co-operable, during a forging stroke, with the die assembly to forge a metal billet or pre-form located in the die cavity to a shape corresponding to the shape bounded by the die cavity and the die-head;
- the die assembly being openable and closable;
- releasable locking means to lock the die assembly in its closed condition during the forging stroke of the press;
- and means mounting the die-head for reciprocal axial movement in and relative to the press-head from a fully extended position outward from the press-head to a position axially closer to the press-head when a predetermined maximum pressure on the die-head is exceeded as the press-head moves toward the die assembly during a forging stroke, so that the press-head can move to its bottom dead centre position, with movement of the die-head momentarily stopped when such predetermined maximum pressure is exceeded, when the billet or pre-form is over-sized or under-temperature, to protect the die-head and prevent press stalling.
Dependencies are inferred from the claim text.