Abstract: There is disclosed a cast-forged product of an aluminum alloy consisting essentially of: 0.6 to 1.8 wt % of silicon; 0.6 to 1.8 wt % of magnesium; 0.8 wt % or less of copper; 0.2 to 1.0 wt % of manganese; 0.25 wt % or less of chromium; 0.0 to 0.15 wt % of titanium; and unavoidably contained impurities. When the product is used as various parts for automobiles formed of aluminum, such as suspension parts, frames, and parts for engines, the product is more superior in mechanical properties such as a tensile strength, proof stress, and elongation, and can be manufactured with a low cost.

Abstract: This invention is directed to a method for manufacturing an aluminum cast-forged product by forging a preform made of a material for forging obtained by casting a material for forging of an aluminum alloy, and an aluminum cast-forged product produced thereby. Forming is performed by heating the preform made of a material for forging at a temperature of from approximately 450° C. to a melting point of the alloy. In this method, a recycled material may be used as a starting material, and some omission of the steps may be possible. There is provided a method for manufacturing an aluminum cast-forged product having excellent mechanical properties, such as, a higher tensile strength, higher proof stress, higher elongation, and the like with a lower production cost.

Abstract: There is disclosed a cast-forged product of an aluminum alloy consisting essentially of: 0.6 to 1.8 wt % of silicon; 0.6 to 1.8 wt % of magnesium; 0.8 wt % or less of copper; 0.2 to 1.0 wt % of manganese; 0.25 wt % or less of chromium; 0.0 to 0.15 wt % of titanium; and unavoidably contained impurities. When the product is used as various parts for automobiles formed of aluminum, such as suspension parts, frames, and parts for engines, the product is more superior in mechanical properties such as a tensile strength, proof stress, and elongation, and can be manufactured with a low cost.

Abstract: The invention is directed to a method for casting a forged material and a mold usable therefor. A finished metal product which is free from the internal defects is manufactured by solidifying a forged material in a specified direction, with concentrating the defects in the riser portion of the mold for casting a forged material. The finished metal product having a lightweight is produced with a less cost, resultantly, carbon dioxide discharged from the automobiles is reduced, thereby the present invention can contribute to environmental protection measures such as preventing global warming.

Abstract: An exhaust gas purifying device for removing harmful solid particles, sparks and flames contained in exhaust gas discharged from an internal combustion engine comprises a cylindrical body member connected to a muffler in an exhaust gas system of the engine. The cylindrical body member is separated into front and rear chambers by an intermediate partition plate. The front chamber includes an exhaust gas introducing hole in a front wall thereof and displaced with respect to a communicating hole formed in the central portion of the partition plate to thereby effectively remove the harmful particles at low flow rate of the exhaust gas. The rear chamber includes a swirl-generating means on the upstream side thereof and a solid particle collecting chamber on the outer periphery thereof to thereby remove the harmful particles at high flow rates of the exhaust gas.