Piercing and coining apparatus
OwnerWilliam A. Paulinventor
Life of this patent
Estimating the term…
Abstract
Apparatus for piercing and coining a metal workpiece is provided. The apparatus includes a punch and a back-up die which accomplish the piercing, and a coining die located around the punch and movable with respect thereto to accomplish the coining. The punch and coining die are driven by a hydraulic ram which enables the overall apparatus to be relatively compact as compared to most heavy-duty dies and is adaptable for use at a station in a machine which also performs other operations on the workpiece. The workpiece is held precisely in position by a plurality of locators including adjustable fingers which contact and position the workpiece.
Claims10
Apparatus for piercing and coining a workpiece comprising a main frame, means on said frame for locating the workpiece, a back-up die, means for supporting said die on said frame on one side of the workpiece, a ram on the other side of the workpiece, a punch carried by said ram and extending toward the workpiece, a coining die in front of said ram and positioned around a portion of said punch, a shedder pin carried centrally in said punch and extending forwardly thereof, means for resiliently connecting said ram and said coining die, said coining die being spaced from said ram prior to said coining die contacting the workpiece and means for moving said ram toward and away from the workpiece.
Apparatus for piercing and coining a metal workpiece comprising a main frame, means carried by said frame for locating the workpiece, a back-up die, means for supporting said back-up die on one side of the workpiece, a ram, bushing means slidably carrying said ram for movement toward and away from said back-up die on the side of the workpiece opposite said back-up die, a punch affixed to said ram and directed toward said back-up die, said punch being movable by said ram through the workpiece and into said back-up die, a coining die having a bore through which said punch extends, a first bar in which said coining die is affixed, said bar being located in front of said ram and extending to the sides thereof, said ram being effective to move said coining die against the workpiece when said ram has moved a distance toward the workpiece, a second bar carried by said ram and movable therewith, resilient means connected between said first bar and said second bar and effective to maintain said coining die against the workpiece around said punch as said ram is retracted from the workpiece, a hydraulic cylinder carried by said frame, a piston rod extending from said cylinder and connected to said ram, means for supplying hydraulic fluid under pressure to both ends of said cylinder, and pressure-sensing means for changing the supply of fluid from the blind end of said cylinder to the rod end thereof when the pressure of the fluid at the blind end reaches a pre-set value.
Dependencies are inferred from the claim text.