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由一机部机械院与我厂共同设计的J87-300型冷挤压机的顶料装置的顶料凸轮,其尺寸及形状如图1所示。
J87-300 type cold extrusion press designed by a machinery department and our factory, the top material cam of the top feeding device has the size and shape as shown in Fig.1.