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screw presses

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Published: 01 January 2005
Fig. 13 Representation of slide velocities for mechanical and screw presses in forming a thick and a thin part ( V b , V e , velocity at the beginning and end of forming, respectively) More
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Published: 01 December 1998
Fig. 7 Two basic designs of screw presses. (a) Friction-drive press. (b) Direct-electric-drive press More
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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 More
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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 More
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Published: 01 January 2005
Fig. 21 Two common types of screw press drives. (a) Friction drive. (b) Direct electric drive. More
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Published: 01 January 2005
Fig. 23 Cross section of a wedge screw press design. Courtesy of Lasco Unformtechnik More
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Published: 01 January 2005
Fig. 11 Load versus displacement curves for die forging using a screw press. (a) Press with load or energy metering. (b) Press without load or energy metering ( E p , energy required for deformation; L M , maximum machine load; E d , elastic deflection energy; d , elastic deflection More
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Published: 01 January 2005
Fig. 12 Energy versus load diagram for a screw press both without a friction clutch at the flywheel (dashed line) and with a slipping friction clutch at the flywheel (solid line). E W , nominal machine energy available for forging; L M , nominal machine load; E P , energy required 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
..., 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...
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
... Abstract This article discusses the significant factors in the selection of forging equipment for a particular process. It describes the characteristics of forging hydraulic presses, mechanical presses, screw presses, and hammers. The article discusses the significant characteristics...
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
... such as workpiece and die temperature, strain rate, and deformation mode. The article describes the relative forgeability of the ten most widely used aluminum alloys, and reviews common forging equipment, including hammers, mechanical and screw presses, and hydraulic presses. It also discusses postforge operations...
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Published: 01 January 2005
Fig. 10 Highly configured (twisted) alloy Ti-6Al-4V and alloy Ti-8Al-1Mo-1V turbine engine fan and compressor blades that were forged in screw presses More
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...
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
... equipment (see the section “Forging Equipment” in this article). The deformation or strain rate imparted to the deforming metal varies considerably, ranging from very fast (for example, ≥10 s −1 on equipment such as hammers, mechanical presses, screw presses, and high-energy-rate machines) to relatively...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003021
EISBN: 978-1-62708-200-6
... screws or bolts, nuts and washers, molded-in threads, self-threading screws, rivets, spring-steel fasteners, press fits, and snap fits. The article explains solvent bonding used for thermoplastic parts, and tabulates the solvent types used with various plastics. It also describes the surface preparation...
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Published: 01 November 1995
) (a) Typical pin placement—on a 90 mm (3 1 2 in.) screw, use 27 pins made of 304 stainless steel 4 mm ( 5 32 in.) diameter on a 36 hole index for each row. Press fit into 6.4 mm ( 1 4 in.) deep holes and grind to screw diameter. Do not interrupt the screw flight. Place four rows More
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006080
EISBN: 978-1-62708-175-7
..., the contact time between the preform and die must be as short as possible. For this purpose, screw presses with a very stiff frame are widely used for powder forging. The screw press motion ensures rapid withdrawal of the forging punch from the die, and the stiff frame minimizes contact time between the part...
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
... at 10/s strain rate compared to 4340 alloy steel at 27/s strain rate At the strain rate of 10/s in Fig. 1 , which is representative of a strain rate typical of a mechanical or screw press or other rapid-strain-rate forging equipment, the highly β-stabilized alloy Ti-13V-11Cr-3Al has the highest...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006017
EISBN: 978-1-62708-175-7
... of operations. Platinum was precipitated in powdered form, slightly compressed in a crucible, and heated to white heat. The powder was then put in a steel matrix and put under pressure with a screw coining press. The compact platinum was repeatedly reheated and re-pressed until a solid ingot was formed...
Book Chapter

Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002143
EISBN: 978-1-62708-188-7
... per inch) in rods 0.43 mm (0.017 in.) in diameter. At the other extreme three threads per 25 mm (three threads per inch) have been die cut into 610 mm (24 in.) pipe for the petroleum industry. Machines The machines most used for die threading are drill presses, manual turret lathes, single...