Hitachi, Ltd.

Showa Denko K.k.

Yasushi Ohuchi

Hisanobu Kanamaru

Yasuhiro Takahashi

Hideo Tatsumi

Naotatsu Asahi

Takeo Tamamura

Ryota Mitamura

Makoto Nakayama

Kozo Tabata

Hiroyuki Kawawa

Arinobu Hamada

An aluminum alloy consisting essentially of 8 to 15% by weight of silicon, 0.05 to 0.7% by weight of magnesium, 1 to 4.5% by weight of copper, the balance being aluminum, wherein a silicon crystal in eutectic structure crystallized out in an aluminum matrix has a mean grain size not larger than 5 microns and intermetallic compounds of magnesium and copper are finely precipitated in the matrix as age-hardening elements for the matrix, and the alloy has at least 40 kg/mm.sup.2 tensile strength and at least 10% elongation, good antiwearing and excellent workability. The disclosure is also concerned with a method of making the above-mentioned aluminum alloy.

Aluminum alloys having improved mechanical properties and workability

A plastic molding process for metal disclosed comprises the steps of: placing a blank within a first female die in contact with the teeth thereof, said female teeth being adaped to define the outer peripheral configuration of said blank, and said blank being supported on top of the female teeth of a second female die placed under said first female die; and then pressing the male teeth of a male die into said blank in a manner that the difference between the radius of a die cushion and the radius (l) of the male die as measured from the center of the male die to the bottom of a tooth groove thereof is equal to or larger than the plastic deformation .delta. of the blank in the radial direction, whereby the blank is molded into a desired shape, without exerting a force on the bottom or the male teeth groove.

Plastic molding process for metal

An ac generator for a vehicle in which a stator frame having a stator core fixed thereto and supporting a rotary shaft therein is composed of a pair of end covers of steel plate and a cylindrical casing of steel plate, and the end covers, cylindrical casing and stator core are integrally connected together by welding so as to ensure a high mechanical strength.

AC Generator for vehicles

When cylindrical parts are produced by extrusion from a metallic material having high mechanical strength, the dies tend to be easily broken and worn, and it is difficult to secure accuracy of finishing of the product. According to the present invention, with regard to the form of a die, the ironing portion is reduced in contact area thereof, is formed into such a configuration that the contact area thereof does not increase even if the dies are worn to some extent, and a die angle and configurations of an ironing portion and a relief portion are selected properly, thus preventing the dies from being easily broken or worn.

Plastic working dies for cylindrical parts

Growing community of inventors

Katsuta, Japan

Yasushi Ohuchi