New PDF release: Manufacturing Technology

By W. Bolton (Auth.)

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O n e effect of the above change in cross-section is that the neutral axis becomes displaced towards the compressed side of a b e n d . This affects the calculations that a designer needs to m a k e in determining the length of a blank necessary to produce a bent part of given dimensions. A n allowance has to be m a d e for the neutral axis shift, the allowance depending on the thickness of the blank and the bend radius. Tables are available for the allowances. 17 is Lx + L2 — D, where D is the allowance.

Also products of complex shape that would require considerable machining can, with advantage, be manufactured in this way. C o m p o n e n t s can be produced with a calculated amount of porosity. , filling about 8 0 % of the material. Porous bearings can be manufactured containing oil to give self-lubrication. High rates of production are possible, and the operation does not involve highly skilled labour. T h e shaped dies and punches are expensive due to the use of expensive materials for the dies and p u n c h e s .

T h e machine tool used for turning is the lathe. O t h e r operations are also possible with the lathe. 40b) drilling with the drill fed against the end of the rotating workpiece and screwcutting. T h e r e are a n u m b e r of types of lathe and the choice of lathe d e p e n d s on a n u m b e r of factors. O n e factor is the number of parts to be p r o d u c e d . T h e centre lathe is a versatile machine tool but is not ideal for rapid mass production because of the time required for changing and setting tools and making measurements on the workpiece.

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