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    • 2. 发明授权
    • Extrusion die for manufacturing tube with small hollow portions, mandrel used for said extrusion die, and multi-hollowed tube manu-factured by using said extrusion die
    • 用于具有小中空部分的制造管的挤出模具,用于所述挤出模头的芯棒,以及通过使用所述挤出模具制造的多中空管
    • US07093474B2
    • 2006-08-22
    • US10491270
    • 2002-10-22
    • Kimihisa HiramotoHideyo YamasakiFumio Shimizu
    • Kimihisa HiramotoHideyo YamasakiFumio Shimizu
    • B21C25/04
    • B21C25/00B21C23/085
    • An extrusion die for manufacturing a tube with a plurality of small hollow portions arranged in a width direction of the tube, includes a female die for defining an outer periphery of the tube and a mandrel combined with the female die. The mandrel includes a body portion and a comb-shaped portion protruded from the body portion, the combe-shaped portion including a plurality of columnar portions desposed in a width direction of the comb-shaped portion at certain intervals. An outer periphery of a tip end portion of each of the plurality of columnar portion constitutes a bearing portion for defining an inner periphery of each of the plurality of small hollow portions of the tube. Each of the plurality of columnar portions has outside surfaces opposed in a thickness direction of the comb-shaped portion, and at least one of the outside surfaces has an inwardly dented portion behind the bearing portion, the inwardly dented portion constituting an extrusion material filling space. The at least one of the outside surfaces extending from a basal end portion of each of the plurality of columnar portions to the inwardly dented portion is formed into an inclined or curved surface for leading extrusion material to the inwardly dented portion. The at least one of the outside surfaces extending from the dented portion to the bearing portion is formed into an inwardly curved surface.
    • 用于制造具有沿着管的宽度方向布置的多个小中空部分的管的挤出模具包括用于限定管的外周的阴模和与阴模结合的心轴。 心轴包括主体部分和从主体部分突出的梳状部分,梳状部分包括沿梳齿形部分的宽度方向以一定间隔设置的多个柱状部分。 多个柱状部中的每一个的前端部的外周构成用于限定管的多个小中空部的每一个的内周的轴承部。 多个柱状部分中的每一个具有在梳状部分的厚度方向上相对的外表面,并且至少一个外表面在轴承部分后面具有向内凹陷部分,向内凹陷部分构成挤出材料填充空间 。 从多个柱状部中的每一个的基端部延伸到向内凹陷部分的至少一个外表面形成为用于将挤出材料引导到向内凹陷部分的倾斜或弯曲表面。 从凹陷部延伸到轴承部的外表面中的至少一个形成为向内弯曲的表面。