Apparatus for controlling the movement of a reciprocatory vacuum forming machine driven element of a metal forming machine between extended and retracted positions including first piston means defined by said element Wholesale Martin Brodeur Jersey , first reservoir means slidablyreceiving said first piston means therein, said first piston means having a face disposed in fluid communication with said first reservoir means, second reservoir means, second piston means secured to and projecting from said face of said first pistonmeans Wholesale Scott Niedermayer Jersey , said second piston means being slidably received within said second reservoir when said first piston means is substantially retracted and being disposed wholly outside said second reservoir when said first piston is essentially fully extended,said face of said first piston means having a substantially larger working area exposed to said fluid in said first reservoir than the working surface area of said second piston means which is exposed to said fluid in said second reservoir, a source ofpressurized hydraulic fluid, means connecting said source of pressurized hydraulic fluid in fluid communication with said first reservoir Wholesale Jamie Langenbrunner Jersey , means connecting said source of pressurized hydraulic fluid in fluid communication with said second reservoir.
athird reservoir, conduit means connecting said third reservoir in fluid communication with said first reservoir, valve means interposed in said conduit means for controlling the flow of hydraulic fluid between said first and third reservoirs, first andsecond valve means interposed between said source of pressurized hydraulic fluid and said first and second reservoirs Wholesale Scott Stevens Jersey , respectively, and means controlling the opening and closing of said first valve means and wherein said first valve means permits avolume of hydraulic fluid to flow from said source of hydraulic fluid into said first cavity at all times except when it is desired to move said first piston means toward its retracted position.
In a typical extrusion operation, a metal billet is held within a die cavity. A punch or anvil is inserted in the die cavity to define an annular space therebetween and held stationary while the billet is forced to extrude over and about theanvil, resulting in extrusion of the billet into and then out of the annular space between the die cavity and the anvil. In other embodiments Wholesale Ken Daneyko Jersey , the anvil is itself moved relative to a stationary die cavity with resultant extrusion of the billet out ofthe die cavity through the annular space between the anvil and the die cavity wall.
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