| 摘要 |
<p>PURPOSE:To contrive to prevent a mold from breaking due to the collision of a slide core against a middle core through the advancement of the slide core, which is positionally shifted relative to the middle core, by a method wherein an air pressure detecting means is provided so as to detect the clearance between a lower mold and the middle core by means of air pressure in order to stop the mold closing. CONSTITUTION:In a lower mold 2, a compressed air feeding hole 8 is bored so as to be opened outside a mold at one end and run horizontally in the mold and is bent at right angles in order to be opened to the abutting surface of the middle core 3 at the other end. The air feeding hole 8 is connected through an air feeding passage 9 to a compressed air supplying source 12. An air circulation control valve 11 and a pressure switch 10, which works at a predetermined air pressure, are provided in the air feeding passage 9. The pressure switch 10, by the working of which the mold is closed, is connected to the mold closing mechanism. When the air pressure reaches the predetermined value, the signal sent from the pressure switch 10 lowers the upper mold 5 and at the same time the slide core 4 is interlocked so as to close the molds. Accordingly, if something comes between the lower mold 2 and the middle core 3, the upper mold 5 and the slide core 4 do not work.</p> |
