| 摘要 |
<p>The present invention relates to a method for manufacturing a car door pillar and a door pillar made by the manufacturing method and, more specifically, to a method for manufacturing a car door pillar which performs an injection process not to need a painting work by using polymethacrylic acid methyl and a door pillar made by the method. The present invention provides the method for manufacturing the car door pillar, comprising a drying step; a mounting step; a heating step; a measuring step; an injection step; and a cooling step. In the drying step, the polymethacrylic acid methyl is dried. In the mounting step, the polymethacrylic acid methyl dried in the drying step is mounted in an injection cylinder. In the heating step, the cylinder where polymethacrylic acid methyl is mounted is heated in a longitudinal direction at several different temperature stages. In the measuring step, the polymethacrylic acid methyl is measured as much as an amount to be injected. In the injection step, the measured polymethacrylic aid methyl is injected in a mold at regular pressure. In the cooling step, the polymethacrylic acid methyl is cooled in a longitudinal direction from an inlet of the injection mold at several different temperature stages. The present invention injects the polymethacrylic acid methyl in the mold, divides the mold according to several stages, and performs a cooling process differently according to each of the stages to manufacture the door pillar, thereby not needing the painting process. Therefore, the present invention may eco-friendly manufacture the door pillar because of not discharging environment pollution materials as well as simplify the door pillar manufacturing processes.</p> |
