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Image
Published: 01 December 1998
Fig. 7 Two basic designs of screw presses. (a) Friction-drive press. (b) Direct-electric-drive press
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Published: 01 January 2005
Fig. 17 Schematic of drive systems for hydraulic presses. (a) Direct drive. (b) Accumulator drive.
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Image
Published: 01 January 2006
Fig. 14 Four types of drive and clutch arrangements for mechanical presses. (a) Nongeared (or flywheel) drive. (b) Single-reduction, single-gear drive; clutch in gear. (c) Single-reduction, twin-gear drive; clutch on driveshaft. (d) Multiple-reduction, twin-gear drive; clutch on intermediate
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Image
Published: 01 January 2006
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Published: 01 December 1998
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Published: 01 December 1998
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003973
EISBN: 978-1-62708-185-6
..., and computer-controlled hammers. It describes the three basic designs of high-energy-rate forging (HERF) machines: the ram and inner frame, two-ram, and controlled energy flow. The article reviews forging mechanical presses, hydraulic presses, drive presses, screw presses, and multiple-ram presses...
Abstract
Hammers and high-energy-rate forging machines are classified as energy-restricted machines as they deform the workpiece by the kinetic energy of the hammer ram. This article provides information on gravity-drop hammers, power-drop hammers, die forger hammers, counterblow hammers, and computer-controlled hammers. It describes the three basic designs of high-energy-rate forging (HERF) machines: the ram and inner frame, two-ram, and controlled energy flow. The article reviews forging mechanical presses, hydraulic presses, drive presses, screw presses, and multiple-ram presses.
Image
Published: 01 January 2006
Fig. 12 Types of press drives. The first three press drives, from the left, are called “single-end drives” because the crankshaft is driven from one end only. When the crankshaft is driven from both ends, the drive is termed a “twin drive” (far right).
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Image
Published: 01 January 2005
Book Chapter
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005113
EISBN: 978-1-62708-186-3
... on the two basic drive systems used in operating press brakes, namely, mechanical and hydraulic drive systems. The article also provides an outline on the tooling associated with press-brakes. hydraulic drive systems press brakes widening PRESS BRAKES ( Fig. 1 ) are a common and versatile type...
Abstract
Press brakes are a common and versatile type of equipment for bending metal by delivering an accurate vertical force in a confined longitudinal area. This article begins with a discussion on the design, widening methods, and types of materials used in press brakes. It focuses on the two basic drive systems used in operating press brakes, namely, mechanical and hydraulic drive systems. The article also provides an outline on the tooling associated with press-brakes.
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Published: 01 January 2006
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Published: 01 January 2006
Image
Published: 01 January 2005
Fig. 8 Schematic of a direct-drive, direct hydraulic extrusion press highlighting some of the features of modern presses. Courtesy of Danieli Breda
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Image
Published: 01 January 2005
Fig. 9 Principle of operation of a mechanical press with a Scotch yoke drive. (a) The ram is at the top of the stroke; the Scotch yoke is centered. (b) Scotch yoke is in the extreme forward position midway through the downward stroke. (c) At bottom dead center, the Scotch yoke is in the center
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Published: 01 January 2005
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Published: 01 January 2005
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Published: 01 January 2005
Fig. 18 Schematic illustration of two types of hydraulic press drives. (a) Push-down drive. 1, Stationary cylinder crosshead; 2, Moving piston-ram assembly; 3, Stationary press bed with return cylinders. (b) Pull-down drive. 1, Movable cylinder-frame assembly; 2, Press bed with return
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Published: 01 January 2005
Fig. 22 Screw press drive combining the characteristics of mechanical and screw presses. (1) Flywheel; (2) Air or hydraulic operated clutch; (3) Screw; (4) Ram; (5) Lift-up cylinders
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Image
Published: 01 December 1998
Fig. 8 Screw press drive combining the characteristics of mechanical and screw presses. (a) Flywheel. (b) Air-operated clutch. (c) Screw. (d) Ram. (e) Lift-up cylinders
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Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003177
EISBN: 978-1-62708-199-3
... of press Type of frame Position of frame Action Method of actuation Type of drive Suspension Ram Bed Open-back Gap Straight-side Arch Piller Solid Tie Rod Vertical Horizontal Inclinable Inclined Single Double Triple Crank Front-to-back crank Eccentric Toggle Screw Cam Rack...
Abstract
This article describes the presses that are mechanically or hydraulically powered and used for producing sheet, strip, and plate from sheet metal. It also presents the JIC standards for presses, compares the presses based on power source, details the selection criteria and provides information on the various drive systems and the auxiliary equipment. It describes the selection of die materials and lubricants for sheet metal forming and provides information on the lubrication mechanisms and selection with a list of lubricant types for forming of specific sheet materials of ferrous or nonferrous metals. The article reviews the various types of forming processes such as blanking, piercing, fine-edge blanking, press bending, press forming, forming by multiple-slide machines, deep drawing, stretch forming, spinning, rubber-pad forming, three-roll forming, contour roll forming, drop hammer forming, explosive forming, electromagnetic forming, and superplastic forming.
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