The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 1991
Filed:
May. 24, 1989
Shunzo Aoyama, Wakoh, JP;
Ahresty Corporation, Tokyo, JP;
Abstract
This invention provides a die casting method comprising the steps of that a pulverized insulation agent is coated to form a porous insulation layer on the interior surface of die cavity when a casting products are made by utilizing a die casting machine, wherein a molten metal is filled into the cavity with a slow pace thereon, a high pressure is applied upon the molten metal mechanically so as to crush and make thin the porous insulation layer pressed by the high pressurization upon the molten metal, simultaneously the molten metal sinks into and passes through the porous insulation layer to reach at the interior surface of the cavity wherein the molten metal is rapidly solidified to produce a final casting products according to the temperature drop due to the direct contact with the interior surface of the cavity. By providing the porous insulation layer in the interior surface, the molten metal is well spread on the nook and corner of die cavities during the restriction of solidification speed, thereby can prevent the occurrences of pine hole or blowhole upon the casting product. Further by selecting a lubrication type insulation agent, it can facilitate the removal of casting product from the cavity wherein has no further use for any conventional type mold-releasing agent deemed as a pollutive material.