| 摘要 |
<p>A method for forming a prearranged rupture portion for an air bag door including the steps of setting an instrument panel on a fixing jig, and, then measuring, prior to forming grooves that make a prearranged rupture portion, the position of the back surface of a substrate of the instrument panel by a measuring device. When forming the first groove, the depth of the first groove formed by a working device is controlled with reference to a preset position of the set surface of the fixing jig, and when forming the second groove by the working device, correction is made depending on the position of the back surface of the substrate measured by the measuring device, and the depth of the second groove formed by the working device is controlled based on this corrected data</p> |
