| 摘要 |
<p>Provided is a die casting method in which there are sequentially performed a first step, wherein the inner surface of a cavity (5) is coated with a mold release agent and the inner circumferential surface of a sleeve (8) communicating with the cavity (5) is coated with a lubricant, a second step, wherein molten metal is supplied to the interior of the sleeve (8) from a supply port (8a), and a third step, wherein a plunger (12) fitted into the sleeve (8) is moved forward, thereby pressure-filling the cavity (5) with the molten metal (11) in the sleeve (8) while blocking the supply port (8a). In addition, during the third step the pressure in the sleeve (8) is reduced via a first decompression passage (41), which opens into the sleeve (8) but prevents the passage of molten metal. Thus, when the molten metal is supplied, it is possible to prevent contamination of the cavity due to a decomposed gas of the lubricant generated within the sleeve, and to decompress the interior of the cavity efficiently, enabling a die cast product with good quality to be obtained.</p> |
