Development of Sequential Powder Extrusion Process and Its application to Production of Functionally Gradient Materials

连续粉末挤出工艺的发展及其在功能梯度材料生产中的应用

• 批准号: 03555149
• 负责人: YAMAGUCHI Katsuhiko
• 金额: $ 5.76万
• 依托单位: Kyoto Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555149/
• 关键词: Powder extrusion; Sequential extrusion; Optimal die angle; Functionally gradient material; Tube extrusion; Rod and tube; 傾斜組成材料; 粉末材料; アルミニウム粉末; 押出し; 管の押出し

A new extrusion process is proposed to facilitate the production of long rods and tubes by using metal powders as starting materials. In this process, the supply of small amount of powder into container and subsequent extrusion in short stroke is repeated one after another. As a model material, atomized aluminum powder is used and is directly extruded without canning and without blending with any binders and lubricants.(1) It is confirmed that rods and tubes with relative density of 98-99 % and tensile strength of 80-90 % of solid aluminium can be produced without any problems. The optimal semi-die angle for powder extrusion exists around 30-40 degree, while 5-10 degree for the extrusion of solid metals.(2) The strength of a rod produced by the hot extrusion is somewhat larger compared with that by the cold powder extrusion. However, the surface condition of extruded rods is not good due to the occurrence of galling.(3) The axial stress and density distributions are calculated by the analysis using slab method together with the plasticity theory of porous materials proposed by Oyane and Shima. The analytical results show good agreement with the experimental ones.(4) An attempt is made to produce so-called functionally gradient materials by the sequential powder extrusion, and the possibility is discussed.

提出了一种以金属粉末为原料生产长杆、长管的挤压新工艺。在此过程中，将少量粉末供应到容器中，然后在短行程中挤出，一个接一个地重复。作为模型材料，使用雾化铝粉，直接挤出，无需罐装，也无需与任何粘合剂和润滑剂混合。(1)已经证实，可以毫无问题地生产相对密度为98- 99%、抗拉强度为80- 90%的固体铝的棒和管。粉末挤压的最佳半模角在30-40 °之间，固态金属挤压的最佳半模角在5-10 °之间。(2)与冷粉末挤压相比，热挤压生产的棒材的强度稍大。然而，由于磨损的发生，挤压棒的表面状况不好。(3)采用平板法结合Oyane和Shima提出的多孔材料塑性理论计算了轴向应力和密度分布。分析结果与实验结果吻合较好。(4)尝试用粉末顺序挤压法制备梯度功能材料，并探讨了其可能性。

项目成果

Yamaguchi,K.: "Production of Rods and Tubes by Sequential Extrusion of Metal Powder" Proc.4th Int.Conf.Technology of Plasticity,1993-9(発表予定).(1993)

Yamaguchi, K.：“通过金属粉末连续挤压生产棒材和管材”Proc.4th Int.Conf.Technology of Plasticity，1993-9（待提交）。（1993）

山口 克彦: "金属粉末の逐次押出しによる円管の成形" 平成4年度塑性加工春季講演会講演論文集. 677-680 (1992)

Katsuhiko Yamaguchi：“通过连续挤压金属粉末形成圆管”1992 年春季塑料加工会议记录 677-680 (1992)。

山口 克彦: "金属粉末の逐次押出しによる円管の成形" 平成4年度塑性加工春季講演会講演論文集. (1992)

Katsuhiko Yamaguchi：“通过连续挤压金属粉末形成圆管”1992 年春季塑性工作会议论文集（1992 年）。

山口 克彦: "金属粉末の遂次押出しによる円管の成形" 平成4年度塑性加工春季講演会講演論文集. 677-680 (1992)

Katsuhiko Yamaguchi：“通过连续挤压金属粉末形成圆管”1992 年春季塑料加工会议记录 677-680 (1992)。

YAMAGUCHI,K.: "Production of Rods and Tubes by Sequential Extrusion of Metal Powder" Proc.4th Int. Conf. Technology of Plasticity,1993-9. (1993)

YAMAGUCHI,K.：“通过金属粉末连续挤压生产棒材和管材”Proc.4th Int。