Results 211 to 220 of about 6,901 (259)

The quality of forgings manufactured with high-speed drop hammers

Metal Science and Heat Treatment, 1968
1. After forging in high-speed drop hammers the mechanical properties are equal to (steels 45 and 1Kh13) or exceed (steel Kh18N9T) those of the heat treated steels. 2. The properties obtained in drop forging are retained or improved by additional heat treatment.
Yu. P. Sogrishin, A. N. Zhuchenko
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A Study of Air Drop Hammer Dynamics

1980
An analysis of the dynamics of an air drop hammer with self contained air compressor, is always a rather complicated procedure. It is, neverthelless, fundamental for establishing the relationships between the basic operating parameters both for hammer design and operation.
M. M. Sfantsikopoulos, L. G. Elefsiniotis   +1 more
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The prediction of ringing noise of a drop hammer in a rectangular enclosure

The Journal of the Acoustical Society of America, 1993
The result of the prediction of the ringing noise of a 1/3 scale model of a drop hammer in a rectangular room is presented. The noise prediction uses a numerical technique developed in an earlier work [Y. W. Lam and D. C. Hodgson, J. Acoust. Soc. Am. 88, 1993–2000 (1990)].
Y. W. Lam, D. C. Hodgson
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Fractured Piston Rod of Drop Forge Hammers

2019
Abstract The cause of fracture of two piston rods of hammers of a drop forge was determined. The first rod of 180 mm diam consisted of an unalloyed steel with 0.37% C and 0.67% Mn and had a strength of 56 kp/sq mm at 26% elongation. Fatigue fractures propagated from several points which could be recognized as flaky cracks already in the ...
Friedrich Karl Naumann, Ferdinand Spies
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SPT Hammer Energy Ratio versus Drop Height

Journal of Geotechnical and Geoenvironmental Engineering, 2008
Automatic trip hammers have advantages for standard penetration test (SPT) of consistent drop height and low friction loss during hammer fall. These advantages, however, generate high energy transfer ratios (ER), typically about 90%. This efficiency causes lower sensitivity and higher energy correction coefficients, CE .
T. Leslie Youd, Hannah W. Bartholomew, Jamison H. Steidl   +2 more
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Improvement of Drop-Hammer Compression Test for Rubber Material

Materials Science Forum, 2011
The drop-hammer compression testing method where the stroke is calculated by solving the equation of motions of the drop-hammer and anvil was improved in order to determine the strain-rate dependence of the elastic modulus of rubber material. An additional tool for interrupting the compression was embedded in the apparatus.
Minoru Yamashita, Yasuhisa Sato
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Drop Hammer Forming

2006
Abstract This article discusses the advantages and limitations of drop hammer forming and presents the key factors for determining a process plan. It describes the characteristics of hammers and presents information on tool materials. It explains the use of lubricants and preparation of blanks for forming.
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A gravity drop hammer for high velocity deformation studies of materials

International Journal of Machine Tool Design and Research, 1985
Abstract Deformation behaviour of Al4Mg alloy at high strain rates (200 s −1 ) has been studied using a gravity drop hammer. The instrumentation employed to measure the force, the punch travel and the temperature rise during high velocity deformation is also described.
K.P. Rao, V. Jagasivamani, V. Gopinathan, S.M. Doraivelu   +3 more
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Automatic Control System of Drop Hammer Equipment Based on PLC

2010 International Conference on E-Product E-Service and E-Entertainment, 2010
The use in actual project, the basic structure and working process of the drop hammer are introduced in this paper, and the problems of the traditional manual control are also analyzed. A drop hammer device control system based on PLC is proposed after analyzing the working process in details.
Xin Liu, De-Ren Kong, Xiao-Bin Pan
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Multiple Reference Impact Testing for Bridge Assessment with Drop Hammer

Advanced Materials Research, 2012
A new drop hammer was designed and used for multiple reference impact testing of two bridges. The drop hammer utilizes a multiple-rebound control system for successfully applying a single impact with repeatable high-level force for bridge testing. Signal analysis results indicate that the drop hammer provides a higher signal-noise ratio and a better ...
Yu Juan Liao, Yun Zhou, Peng Qin
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