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cam-driven dies

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003183
EISBN: 978-1-62708-199-3
... into the workpiece in a mechanical press. Driven by a motor and controlled by an air clutch, a full-eccentric drive shaft provides a constant-length stroke to a vertically operating ram. The ram carries the top (or moving) die, whereas the bottom (or stationary) die is clamped to the die seat of the...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003983
EISBN: 978-1-62708-185-6
... by a motor-driven flywheel keyed to the spindle. During rotation of the spindle, the dies move outward by centrifugal force and inward by the action of the backers striking the rolls. The number of blows (impacts) produced by the dies is 1000 to 5000 per minute, depending on the size of the swager...
Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003990
EISBN: 978-1-62708-185-6
... asymmetric pieces. In rotating-die machines, the upper, or tilted, die has rotational and translational motion, while the lower die has only rotational motion ( Fig. 3a ). Depending on the specific machine, both dies can be independently driven or only the lower die is power driven while the upper die (the...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003178
EISBN: 978-1-62708-199-3
... bottom rolls are power driven; the top roll, an idler, is moved up or down by a hydraulic cylinder. Stretch bending is used to bend large irregular curves. In this technique the workpiece is gripped at the ends and bent as it is stretched around a form. The gripped ends are usually trimmed off...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004006
EISBN: 978-1-62708-185-6
... extrusion velocity, amount of pressure required, and type of lubricant, for successful and efficient hot extrusion. The article concludes with a discussion on applications and design methodology that provides insight into CAD/CAM of extrusion dies. computer-aided design  direct extrusion extruded...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003980
EISBN: 978-1-62708-185-6
... pounds can be produced by this method. The essential components of a typical machine for hot upset forging are illustrated in Fig. 2 . These machines are mechanically operated from a main shaft with an eccentric drive that operates a main, or header slide. Cams drive a die slide, or grip slide, which...
Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003987
EISBN: 978-1-62708-185-6
..., however, is accomplished during a relatively short portion of the stroke, so that a coining load is required only during a small portion of the press cycle. Drop hammers, and knuckle-type and eccentric-driven mechanical presses are extensively used in coining. High-speed hydraulic presses also are well...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003996
EISBN: 978-1-62708-185-6
.... These techniques serve to reduce the cost of dies, shorten die manufacturing flow times, and, perhaps more importantly, to increase the accuracy of the dies by as much as 50% compared with the other techniques. For example, standard die-sinking tolerances are ±0.1 mm (±0.005 in.), but with CAM-driven...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003177
EISBN: 978-1-62708-199-3
... maintenance. Space is required around the dies for accessories such as keepers, pads, cam return springs, and gages; space is also needed for attaching the dies to the press. Shut height of the press, with adjustment, also must be suitable for the dies. For higher-speed operation, presses should be...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003207
EISBN: 978-1-62708-199-3
...). Upset forces are generated in a similar manner. In larger machines, these forces are generated by pneumatic systems, oil hydraulic systems, combination air/oil hydraulic systems, or motor-driven cam systems. Machines used for flash welding generally consist of a mainframe; a low-impedance welding...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.9781627081863
EISBN: 978-1-62708-186-3
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004000
EISBN: 978-1-62708-185-6
... microstructure, and/or to minimize cost. For example, open-die forging frequently precedes closed-die forging to preshape or preform the metal to conform to the subsequent closed dies, to conserve the expensive input metal, and/or to assist in overall microstructural development. The hot deformation processes...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.9781627081979
EISBN: 978-1-62708-197-9
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003053
EISBN: 978-1-62708-200-6
... consolidation techniques, principally uniaxial pressing. The powders that are used must be agglomerated in order to evenly fill the dies and molds using automated die-loading equipment. Even filling is necessary to obtain predictable compression ratios and fill densities. These are especially important...
Book Chapter

By Erhard Klar
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003185
EISBN: 978-1-62708-199-3
... densities and their lower oxygen contents. For thin or fragile parts, high green strength powders are preferred. Copper powders used in P/M friction products are an example where green strength has been driven to an extreme and where special powder manufacturing processes have been developed. Here, the...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.9781627081948
EISBN: 978-1-62708-194-8
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001232
EISBN: 978-1-62708-170-2
... and dies, such as those used for making contact lenses and other optical products. Grinding from solid combines the high-material-removal capability of modern abrasive finishing methods with the closer tolerances and forms that can be achieved using grinding processes. As an example, end mills of...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003061
EISBN: 978-1-62708-200-6
... that make use of wear resistance include dies for hot extrusion of metal rods and tubes, inserts for tablesetting, and paper lapping dies, seals, and bearings. The information in this article is largely taken from the following articles in Ceramics and Glasses, Volume 4, Engineered Materials...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005252
EISBN: 978-1-62708-187-0
... a problem, because it is driven off when the sand is heated to the minimum temperature of 120 °C (250 °F) before coating. Breakage of molds or cores during molding reflects low strength. This can be caused by the use of a finer sand screen distribution without a proportionate increase in resin...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003065
EISBN: 978-1-62708-200-6