CoA. Memos: Manufacturing and Production (1963-1965)

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Browsing CoA. Memos: Manufacturing and Production (1963-1965) by Author "Oxley, P. L. B."

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    An explanation of the apparent bridgman effect in merchant's orthogonal cutting results
    (College of Aeronautics, 19) Oxley, P. L. B.; Welsh, M. J. M.
    Abstract In Merchant's modified shear angle solution it is assumed following Bridgman that the shear strength of the work material is a function of the hydrostatic stress. Although Merchant's experimental results confirm the assumed relation subsequent workers have failed to obtain such agreement. In this paper it is shown that Merchant's results can be explained independently of the Bridgman effect by considering the variable flow stress properties of the work material, which are strain-rate dependent.
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    Flow along tool-chip interface in orthogonal metal cutting
    (College of Aeronautics, 1965-07) Enahoro, H. E.; Oxley, P. L. B.
    In recent papers it has been suggested that over part of the toolchip contact zone the chip does not slide but sticks to the tool, chip flow taking place by shear within the body of the chip. Sticking contact is inconsistent with steady state cutting and in this paper a slip-line field model of chip flow is presented which does not include sticking contact and which is consistent with the relevant experimental observations.
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    Introducing strain-rate dependent work material properties into the analysis of orthogonal cutting
    (College of Aeronautics, 1963-11) Oxley, P. L. B.
    An analysis is presented in which cutting speed, depth of cut and certain strain-rate dependent work material properties are taken into account. Good agreement between theory and experiment is shown over a wide range of cutting conditions.
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    A new approach to the mechanics of metal cutting
    (College of Aeronautics, 1964-09) Oxley, P. L. B.
    Introduction A number of equations have been derived for predicting the shear angle (0 in Fig. 1) in orthogonal metal cutting. The best known of these is due to Merchant (1) who by assuming that the value of shear angle would be such as to give a minimum expenditure of work obtained the relation … [cont.].
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    Note: estimating the charge size in explosive forming of sheet metal
    (College of Aeronautics, 1964-03) Noble, C. F.; Oxley, P. L. B.
    Note: Estimating the charge size in explosive forming of sheet metal In the explosive forming of sheet metal some relatively easy method of estimating the size of the charge is needed. This short note describes a method in which the size of the charge is found by equating the work done in forming the component to that part of the explosive energy available for doing work on the component … [cont].
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    Preliminary report on the analysis of the stresses in a die-bolster combination
    (College of Aeronautics, 1964-08) Oxley, P. L. B.; Welsh, M. J. M.
    An analysis is presented of the stresses in a carbide die-steel bolster combination. Results from a computer treatment of this analysis are given in tabular and graphical form. Suggestions are made as to the choice of interface diameters, and a nomogram is drawn enabling the maximum allowable interference to be selected.