New Japanese Presses Have Hybrid Clamping.Three Japanese suppliers have introduced machines with hybrid direct-clamping mechanisms (not toggles) that combine the benefits of hydraulic and servo-electric power. All these machines use electric motors for the opening and closing strokes, and small hydraulic cylinders to apply clamping pressure. The clamp mechanisms are actually hydromechanical, since after the mold closes, a mechanical locking mechanism engages the ball-screw ram. Energy-saving electric motors are said to provide faster acceleration/deceleration and greater position accuracy. Direct hydraulic clamping provides finer pressure control, more uniform pressure distribution over the mold, delicate mold protection, and greater die-height range. * The example pictured here is the hybrid clamp of Sodick's new Tuparl EH Series from 20 to 220 tons. (Sodick, Inc. is in Torrance, Calif.) It also has an electric ejector ejector (ijekt  r),n by common usage, a device used to remove debris and fluids by negative pressure. Another term is aspirator. See also aspirator. and new LM (linear motion) platen guides, which are said to give superior alignment, since the platen does not ride on the tiebars. Like standard Tuparl machines, EH models have two-stage injection, but the angled extruder has an AC servo motor to save energy. New super-high-speed models for thin-wall molding have a small accumulator mounted right on the injection plunger (photo). It can provide 1500 mm/sec injection speed. * Meiki Co. (represented by Meiki America Corp., Elk Grove Village Elk Grove Village, village (1990 pop. 33,429), Cook and Du Page counties, NE Ill., a suburb of Chicago; inc. 1956. With a population of c.100 at the time of its establishment on open farmland, the village has grown dramatically and steadily, largely because of its , Ill.) has a similar hybrid mechanism on its new Nadem 800-DM and 1200-DM models (88 and 132 tons). They have six-stage clamp-pressure control, said to be useful for molding acrylic Fresnel lenses with injection-compression. It also has a patented spruereturn mechanism, that recycles the sprue sprue, chronic disorder of the small intestine caused by impaired absorption of fat and other nutrients. Two forms of the disease exist. Tropical sprue occurs in central and northern South America, Asia, Africa, and other specific locations. to the hopper. Other features are a new nozzle shutter plate built into a die spacer between the mold and platen. Powered by an air cylinder air cylinder can mean:-
n. 1. A device that shuts something off. 2. A stoppage; a cessation. nozzle. The machine has an auger auger (ô`gər): see drill. auger Tool (or bit) used with a carpenter's brace for drilling holes, usually in wood. It looks like a corkscrew and produces extremely clean holes, almost regardless of how large the bit is. feeder that allows a vacuum to be pulled on the hopper so that polycarbonate A category of plastic materials used to make a myriad of products, including CDs and CD-ROMs. can be molded without drying. Plasticating and injection are all-electric. Last, a new quick-change nozzle can be replaced in one-sixth the usual time. * A third version of the hybrid clamp appears on the new Rheomaster Eon Series (55-165 tons) from Shinwa Seiki Co. (represented by Methods Machine Tools, Sudbury, Mass.). It has electric plasticating and injection as well. |
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