In many sorts of electronic devices the cantilever leaf springs are widely used, to switch the contact points. In designing such a spring, it is necessary to have an accurate knowledge cncerning to the force-deflection relationship. The large deflection of a cantilever spring has been studied for a long time. And the solution of the deflection is obtained in the form of elliptic integrals. A practical formula is necessary for the practical designing of the spring, for it takes a long time to solve the elliptic integrals numerically.
In this paper, firstly, a modulus of the elliptic integrals is derived as a function of a load by introducing thereversion formula. Secondary, the co-ordinates of the loaded point are represented by elliptic functions. Then, the deflections at a loaded point are obtained as a power series of a load.
Similarly, the deflection angle at the loaded point and the practical formula of a deflection curve, in the state of large deflection, is also obtained from the exact solution.

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This paper is concerned with the dimension error of products in hot machining with the whole-heating method. After the cylindrical work is wholly heated, it is naturally cooled by air during machining. The temperature difference between the beginning of the cut and the final portion of the cut increases with the length of time required for machining. Theoretical equations are derived for computing the distributions of the temperatures during machining and the final radius of the work.
It was found that the dimension error increases with increasing length and diameter of the work, and increases with decreasing transfer time from the furnace to the operation.

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This report deals with the unique effect of the tool clearance on the height of the smooth portion which was left not understood in the previous report so that it becomes possible to interpret comprehensively the effect of working conditions which were accounted for previously.
It is found by metallographic study of sections that in some cases the smooth portion is formed by a sort of cutting mechanism. This mechanism is easy to occur when the hydrostatic pressure prevalent in the material near the cutting edge is relatively low and may be temporally named "the mechanism of forming the smooth portion by cutting" being distinguished from that mechanism "by plastic deformation".
In Consideration of these two mechanisms of forming on the basis of this hydrostatic pressure, the effect of the working conditions can be described in a consistent manner, degree of the stock from the die as a parameter.
Basis for the selection of the optimum working conditions is clarified, emphasizing the practical applications of these two mechanisms for the precision shearing operations.

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[in Japanese]

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[in Japanese]

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