Advancements in the manufacturing of dies for hot aluminum extrusion with conformal cooling channels
Advancements in the manufacturing of dies for hot aluminum extrusion with conformal cooling channels
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DOI：
10.1007/s00170-015-7647-4
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发表时间：
2016-03-01
影响因子：
3.4
通讯作者：
Tekkaya, A. Erman
中科院分区：
文献类型：
--
作者：
Hoelker, Ramona;Tekkaya, A. Erman
为了防止工件材料过热并提高热铝挤压的生产率，已知应用具有通过选择性激光熔化增材制造的共形冷却通道的挤压模具。由于迄今为止，与传统的减材方法相比，增材制造工艺通常伴随着更高的制造时间和成本，因此提出了混合挤出模具的新概念。在这里，大体积但几何形状简单的模具部件（模具桥）通过减成法常规地制造，而具有几何复杂性的较小部件（芯轴的尖端）通过激光熔化在其上增材地构建。开发的模具的另一个新奇是冷却剂的隔离进料到目标区域，靠近模具轴承，在那里冷却应该是局部的。数值和实验研究表明，型材的出口温度可以局部降低和控制，这只会导致适度增加的挤压力。实验结果表明，混合工具承受高的机械和热负荷发生在热铝挤压。
To prevent an overheating of the workpiece material and to increase the productivity in hot aluminum extrusion, the application of extrusion dies with conformal cooling channels manufactured additively by selective laser melting is known. Since, to date, the additive manufacturing processes are often accompanied with higher manufacturing time and costs in comparison to conventional subtractive methods, a new concept for a hybrid extrusion die is presented. Here, the large volume but geometrically simple die part, the die bridge, is manufactured conventionally by subtractive methods, and the smaller part with geometrical complexity, the tip of the mandrel, is built-up on it additively by laser melting. A further novelty of the developed die is the isolated feeding of the coolant up to the target area, close to die bearings, where the cooling shall be localized. Numerical and experimental investigations revealed that the profile's exit temperature can be reduced locally and controlled which leads only to a moderate increase of the extrusion force. The experimental results show that the hybrid tools withstand the high mechanical and thermal loads which occur during hot aluminum extrusion.