Browsing by Author "Noble, C. F."

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    Crack formation in blanking and piercing
    (College of Aeronautics, 1963-02) Noble, C. F.
    In recent experiments on blanking and piercing, it was found that cracks occurred in the region of maximum hardness gradient and that cracking could be eliminated by radiusing the punch and die edges. In this paper, a simple stress analysis is made of the corresponding plane strain deformation, account being taken of the strain-hardening property of the work material. The above experimental observations are then shown to be compatible with the predicted stress distributions.
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    Dimensional changes resulting from the heat treatment of EN 30B and Nimar 125
    (College of Aeronautics, 1966-12) Noble, C. F.
    Three components have been manufactured in both EN 30B and N1MAR 125. Dimensional changes following heat treatment have been recorded and, while the sample is only small, the report serves to illustrate the potential benefits which arise from the use of a maraging steel. NIMAR 125 is shown to have reasonably predictable dimensional characteristics and thus indicates the feasibility of completing all machining operations prior to heat treatment.
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    Estimating the charge size in explosive forming of sheet metal
    (College of Aeronautics, 1964-05) Noble, C. F.
    A method is given for estimating the charge size for the explosive forming of sheet metal components. The method is applied to a number of relatively simple shapes and good agreement is shown with experimental results.
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    Horizontal band-saw
    (College of Aeronautics, 1964-05) Foot, R. M.; Boardman, G. E. T.; Dailey, B. R.; Baller, E. G. A.; Noble, C. F.
    The effect of various parameters on the performance of the band saw when cutting mild steel-with a 10 t.p.i. raker-set blade were established over a limited range. These are discussed fully in the ‘conclusions'. With this limited survey it was not found possible to establish the optimum conditions of operation.
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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].