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 An Experimental and Theoretical Investigation for The Machining of Hardened Alloy Steels Theoretical Investigation for The Hard Machining.
Наименование:

An Experimental and Theoretical Investigation for The Machining of Hardened Alloy Steels Theoretical Investigation for The Hard Machining.

издательство Книга по Требованию Химическая и лесная промышленность
Cтраниц 252        мягкая обложка       
Аннотация:These extensions to the Oxley machining theory were verified by experimental results. These results show a good agreement between the Oxley machining theory and hard machining experiment at data. A theoretical model is developed by taking into account the flow stress properties of the AISI 4140 (0. 44% carbon content) to use with the Oxley Machining approach. The research work in this thesis involves an experimental and theoretical investigation for high speed machining of AISI 4140 medium carbon steels and AISI D2 tool steels which are classified as being difficult to machine materials. To find the flow stress data for AISI D2 tool steel, the Johnson and Cook empirical constitutive equation is used as the constitutive model. An experimental program was carried out to determine the cutting forces, chip formation, the secondary deformation zone thickness and surface roughness at different cutting speeds using a 0. 4mm and 0. 8mm nose radii ceramic tools and -7? rake angle for annealed (virgin) AISI 4140 and heat treated AISI 4140 steel. To account for the effect of nose radius edge in hard machining, a simplified geometrical method is used to model the parameters for application in the Oxley Model and works for the cutting conditions considered here. Another series of experiments was carried out on the annealed (virgin) and heat treated AISI D2 with 0. 4mm, 0. 8mm and 1. 2mm nose radii CBN (Cubic Boron Nitride) tools under various cutting conditions. In addition, the magnitude of tool radius should be also considered to determine the prediction of cutting performances. The research work described in this thesis provides useful data for hard machining conditions.
Издательство: Книга по Требованию
Год:2008
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3233 руб
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Поиск: An Experimental and Theoretical Investigation for The Machining of Hardened Alloy Steels Theoretical Investigation for The Hard Machining.



Гражданская война в США

Поэтому те, кто еще мог передвигаться, т.е. не нуждался в экстренной медицинской помощи, запоминался или сразу же заносился в список помощником доктора. Во время привала или передышки между военными действиями, сам доктор, но чаще его помощник обходил военные части с этим списком и вызывал тех, кто нуждался в помощи к врачу. Отсюда пошло выражение " ha 's pu y-lis goi g". Здесь слово pu y-lis обозначало самого помощника доктора, но впоследствии оно приобрело значение "вызов к врачу". Выражение " o be o a pu y lis " обозначает "находиться на учете в больнице". - He wa ed o k ow abou his mama cause she had bee o he pu y lis . I erview wi h Fred Hryhorchuk by Pa ricia Forres Pu i g o s yle – pu i g o airs – важный, держащийся высокомерно. Pu i g o s yle дословно означает "разыгрывать стильность". В армию нередко приходили не только фермеры, но и богатые молодые люди, желающие приключений. В большинстве своем это были городские щеголи, всегда следившие за модой. О таких людях говорили: "He is pu i g o airs" ("Он модничает"). Но помимо того, что они старались соответствовать требованиям времени, они еще и вели себя заносчиво и высокомерно, поэтому впоследствии это выражение стало восприниматься в основном в этом значении. - Hard crackers are ge i g o be a grea delicacy i his God forsake la d of Virgi ia, especially for he ragged Seco d, as he figh i g Fif h calls us; bu we will show hem how wha does pu i g o s yle mea whe we ge our ew clo hes. "Sep ember, 1861" Sal horse – sal ed beef – солонина.
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