Study on Solidification Behavior of Aluminium alloy ( LM 6 ) Castings by using Computer aided Simulation software
Method layout of a casting is an important aspect of tooling development. It involves decisions regarding part orientation in mould, parting line, cores, cavity layout, feeders, neck and gating system. An improper method layout leads either poor quality or low yield, which affects the productivity. Method design is mostly carried out manually, using 2D drawing of the cast part. Then tooling is fabricated the sample castings are produced to 3-4 trials which involves lot of production cost in the from of wastage of manpower, time and hamper the day to day schedule of the particular production. Computer simulation provides a clear insight regarding the location and extent of internal defects, ensuring casting are right as first time and every time. In the present study plate castings were considered to study the solidification behavior of Aluminium Alloy (LM6) at different sizes of riser and riser neck. The VEM based casting simulation software is used to study the solidification behavior of above castings. The simulated results were compared with the experimental results. It is expected that this work will be of immense importance equally to the academicians as well as to the industrial methoding engineers.
Computer aided design and analysis
Descriptions of several digital computer programs for electronic circuit analyses are given. A listing of a special-purpose (Class "C" amplifier design) program is given. Comparisons of several general purpose programs are made. An extensive description of the CADLIB is included. The discussion of the CADLIB points out numerous modifications to the general purpose programs. These modifications include such things as the addition of printer-plots, more accurate algorithms, etc. Also many of the problems encountered in adapting the various programs to the NPGS machine (IBM 360 model 67) are enumerated. Appendicies are included to provide a reference for coding the members of the CADLIB for which no instruction manual was avail. able. An extensive bibliography on applied computer aided design and the job control language details of how the CADLIB was created are included. In addition two extensive examples using the CADLIB are
Aristocratic Century: The sinews of power: political
In his excellent book on the Secretaries of State, Mark Thomson offered ‘the paradox of continuing domination of the aristocracy and the simultaneous insignificance of the House of Lords, per se ’. It is true that, by the beginning of the eighteenth century, the supremacy of the House of Commons in financial matters was a wellestablished convention. The claims of the Commons to an undisputed control over money matters, which had been urged before the Civil War, were resumed immediately after the Restoration and a protracted dispute with the House of Lords began. In 1661 the Lords resolved that there were no precedents in history for this new claim by the House of Commons. In 1671, the Commons retorted that taxation ought not to be questioned by the Lords and in 1678 they reiterated that supply was ‘the undoubted and sole right of the Commons’ and ‘ought not to be changed or altered by the House of Lords’. The Lords' attempt in 1692 to assess their own taxes was also abandoned, though they retired under cover of a rather insubstantial smoke-screen that they maintained their power of amendment to be a ‘fundamental, inherent and undoubted right from which their lordships can never depart’. That established, they departed. Geoffrey Holmes quotes a nice example from 1702 when the bishop of Carlisle found himself the only peer answering to a money bill, ‘no other lord in the House regarded what was doing, this being only (pro forma) to preserve a seeming right to dissent from, or amend, any part of a money bill’.