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gravity-drop hammers

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Published: 01 January 2005
Fig. 1 Principles of various types of gravity-drop hammers More
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
... 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...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003183
EISBN: 978-1-62708-199-3
... Abstract Forging machines use a wide variety of hammers, presses, and dies to produce products with the desired shape, size, and geometry. This article discusses the major types of hammers (gravity-drop, power-drop, high speed, and open-die forging), and presses (mechanical, hydraulic, screw...
Book Chapter

Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005128
EISBN: 978-1-62708-186-3
... by the progressive deformation of sheet metal in matched dies under the repetitive blows of a gravity-drop hammer or a power-drop hammer. The configurations most commonly formed by the process include shallow, smoothly contoured double-curvature parts; shallow-beaded parts; and parts with irregular and comparatively...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003974
EISBN: 978-1-62708-185-6
... equipment Forging machine Speed range Speed-stroke behavior ft/s m/s Hydraulic press 0.2–1.0 (a) 0.06–0.30 (a) Mechanical press 0.2–5 0.06–1.5 Screw press 2–4 0.6–1.2 Gravity-drop hammer 12–16 3.6–4.8 Power-drop hammer 10–30 3.0–9.0 Counterblow hammer 15...
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
... economical method. Drop Hammers Gravity-drop hammers with ram weights in the range of 410 to 910 kg (900 to 2000 lb) are extensively used in the tableware industry. Board hammers can be used, although pneumatic-lift hammers predominate for this type of coining. In producing tableware, reproduction...
Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004031
EISBN: 978-1-62708-185-6
... rolls to form controlled, ram velocity and therefore the square, or rectangular, with sharp or rounded curved sheet and sections. energy delivered to the workpiece can be corners or edges and a cross-sectional area bending stress. A stress involving tensile and varied. See also drop hammer and gravity...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.9781627081856
EISBN: 978-1-62708-185-6
Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003978
EISBN: 978-1-62708-185-6
...” in this article. Hammers and Presses Because the length of the hammer ram stroke and the magnitude of the force must be controllable over a wide range throughout the forging cycle, gravity-drop hammers and most mechanical presses are not suitable for open-die forging. Power forging hammers (air or steam...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003992
EISBN: 978-1-62708-185-6
.... Hammers Simple board-type gravity-drop hammers are not extensively used for the forging of stainless steel, because of their low capacity and because greater control is obtained with other types of equipment. Power-drop hammers (steam or air) are widely used for open-die forgings, as well as for all...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005155
EISBN: 978-1-62708-186-3
... or part, commonly formed for reinforcement. air-lift hammer. A type of gravity-drop hammer contact areas between touching surfaces. See also drawbead. in which the ram is raised for each stroke by an automatic press. A press with built-in electrical air cylinder. Because length of stroke can...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003275
EISBN: 978-1-62708-176-4
... large specimens such as forged steel or wrought alloy steel rolls. In this procedure, a diamond-tipped hammer is dropped from a fixed height onto the surface of the material being tested. The height of rebound of the hammer is a measure of the hardness of the metal. The Scleroscope scale consists...
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: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006493
EISBN: 978-1-62708-207-5
... adaptable to forging but rather that the equipment must be capable of applying pressures higher than those required to accomplish similar forging with many other metals. Hammers Gravity and power-drop hammers are used for both the open-die and closed-die forging of aluminum alloys because...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006484
EISBN: 978-1-62708-207-5
... as the well-known device used for executing persons. Scrap is placed underneath a cutting blade, which drops down onto the piece with the help of vertical guide rails. Hydraulic power is used to accelerate the blade rather than relying on gravity alone. Guillotine shears are more productive than alligator...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003975
EISBN: 978-1-62708-185-6
... forge shops in which most of the forging units are gravity drop hammers make only limited use of die inserts. Inserts can contain the impression of only the portion of a forging that is subject to greatest wear, or they can contain the impression of a whole forging. An example of the first type...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005454
EISBN: 978-1-62708-196-2
...- boards that are raised to the striking Burgers vector. The crystallographic direction tening, or cold restriking. position by power-driven rollers and let fall along which a dislocation moves and the unit by gravity. See also drop hammer. displacement of dislocations; the magnitude bend radius...
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
... of equipment used in the manufacture of forgings is available in the Section “Forging Equipment and Dies” in this Volume. Hammers Gravity and power-drop hammers are used for both the open-die and closed-die forging of aluminum alloys because of the relatively low fabrication costs associated...
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 Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005543
EISBN: 978-1-62708-197-9
... moves and the unit gravity. See also drop hammer. displacement of dislocations; the magnitude bend (transverse). A forming operation in boss. A relatively short, often cylindrical protru- of the Burgers vector is the smallest unit dis- which the bend axis is parallel to the rolling sion or projection...