Electromagnetic re-draw sleeve actuator
AssigneeAura Systems, Inc.
InventorKeith O. Stuart
Life of this patent
Estimating the term…
Abstract
A linear electromagnetic actuator has its core mounted to a can body forming apparatus and its coil attached to re-draw sleeve of such apparatus. The actuator provides for the axial movement of the re-draw sleeve between its fully retracted position and its fully extended position. The re-draw sleeve and the coil are coaxially mounted to each other so that the force exerted on the re-draw sleeve is also coaxial. Once the re-draw sleeve is in its fully extended position, an electromagnet is turned on so that the re-draw sleeve exerts the requisite force on the can material preform. The electromagnet is mounted coaxially about the re-draw sleeve and exerts its force on a magnetic material ring mounted to the re-draw sleeve to hold the re-draw sleeve against the can material preform.
Claims18
In a can forming apparatus in which a cylindrical re-draw sleeve holds a can material preform against an ironing die while a ram pushes said preform through an opening in said die to form a can body, an improvement comprising:
- a linear electromagnetic actuator having an actuator core mounted to said apparatus and a coil element moveable between a first position and a second position, said actuator core having an inner core member, an outer core member and a field coil, said field coil being intermediate said inner core member and said outer core member, said outer core member having a first end region and a second end region, said first end region and said second end region each extending inwardly toward said coil element, said field coil being disposed intermediate said first end region and said second end region, said field coil developing magnetic flux in said core in response to an electrical current therein said re-draw sleeve being mounted to said coil element and further being in a retracted position to allow placement of said can material preform against said ironing die when said coil element is in said first position and in an extended position to hold said can material preform against said ironing die when said coil element is in said second position;
- and
- a timing and control circuit to activate said actuator to place said coil element in said second position when said ram is in a retracted position and to return said coil element to said first position when said ram is in an extended position.
In a can forming apparatus in which a cylindrical re-draw sleeve holds a can material preform against an ironing die while a ram pushes said cup through an opening in said die to form a can body, an improvement comprising:
- a linear electromagnetic actuator having an actuator core mounted to said apparatus and a coil element moveable between a first position and a second position, said actuator core having an inner core member, an outer core member and a field coil, said field coil being intermediate said inner core member and said outer core member, said outer core member having a first end region and a second end region, said first end region and said second end region each extending inwardly toward said coil element, said field coil being disposed intermediate said first end region and said second end region, said field coil developing magnetic flux in said core in response to an electrical current therein said re-draw sleeve being mounted to said coil element and further being in a retracted position to allow placement of said can material preform against said ironing die when said coil element is in said first position and in an extended position to hold said can material preform against said ironing die when said coil element is in said second position;
- an electromagnet mounted to said apparatus;
- a ring of magnetic material mounted coaxially to said re-draw sleeve so that said ring is adjacent said electromagnet when said re-draw sleeve is in said extended position;
- and
- a timing and control circuit to activate said actuator to place said coil element in said second position when said ram is in a retracted position and to return said coil element to said first position when said ram is in an extended position, and further to activate said electromagnet when said re-draw sleeve has been brought to said extended position so that magnetic force on said ring holds said re-draw sleeve against said can material preform and to deactivate said electromagnet when said re-draw sleeve is to return to said retracted position.
Dependencies are inferred from the claim text.