Abstract: Composite magnetic compacts having good conductivity and excellent mechanical and magnetic properties and their forming methods. The composite magnetic compacts are basically made by forming mixtures consisting essentially of 1 to 50 percent by weight of a magnetic powder and the remaining percentage of a powder of superplastic Zn-22Al alloy. A drop in the strength of the compacts that occurs when the mixing percentage of the magnetic powder increases is made up for by the impregration of plastic in the compacts or the simpler addition of a plastic powder to the mixture of the powders of magnetic material and superplastic Zn-22Al alloy. The forming methods of the composite magnetic compacts are carried out at different temperatures and under different conditions depending on the composition of the powder mixtures and so on.

Abstract: Composite magnetic compacts having good conductivity and excellent mechanical and magnetic properties and their forming methods. The composite magnetic compacts are basically made by forming mixtures consisting essentially of 1 to 50 percent by weight of a magnetic powder and the remaining percentage of a powder of superplastic Zn-22A1 alloy. A drop in the strength of the compacts that occurs when the mixing percentage of the magnetic powder increases is made up for by the impregration of plastic in the compacts or the simpler addition of a plastic power to the mixture of the powders of magnetic material and superplastic Zn-22A1 alloy. The forming methods of the composite magnetic compacts are carried out at different temperatures and under different conditions depending on the composition of the powder mixtures and so on.

Abstract: Disclosed herein a method for forming plates into shapes having a double-curved surface, and an apparatus for carrying out the method. For forming a double-curved plate, a work is three-dimensionally formed by passing same through an entrance roll, flexible rolls and exit rolls which are in vertically adjusted positions relative to each other. The flexible rolls are constituted by a pair of flexible and contractibly extensible upper and lower rolls which are supported in flexed state by a plural number of bearings to define therebetween a desired bending shape. As the work is gripped between and fed through the two flexible rolls, it is imparted with a deformation across its width. Therefore, the bending form of the work can be preset by controlling the vertical positions of the bearings which support the flexible rolls, making it possible to form a double-curved plate by a simple control involving a reduced number of control points.

Abstract: The invention provides a novel method for firmly bonding a porous body, e a sintered body prepared by the powder metallurgical techniques with a metal powder, and a fusion-made body, e.g. an iron casting body, hitherto undertaken by the method of pressure welding or diffusion bonding. The inventive method utilizes the principle of infiltration and an infiltrater material is placed at the contacting portion between the porous body and the fusion-made body and heated at a temperature to exceed the melting point of the infiltrater material in vacuum so that the molten infiltrater material is infiltrated into the porous body leading to strong bonding upon solidification to have the porous body and the fusion-made body integrally bonded together.