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Research into Shear Deformation-added Extrusion of Metal-based Powder Using Separated Rotary Container

分体式旋转容器剪切变形挤压金属基粉末的研究

基本信息

批准号：
13650775
负责人：
MAKI Seijiro
金额：
$ 1.54万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650775/
关键词：
powder consolidation extrusion shear deformation metal powder

项目摘要

Shear deformation-added extrusion of metal-based powder using a separated rotary container devised taking note of the promotion of adhesion between metal powders by shear deformation addition was experimentally studied for its realization. From fundamental experiments on ideal introduction of the shear deformation with aluminum powder whose size is 20-42 in mesh, it was found that concerning a shape of the rotary container its barrel length L should be more than the shortest diagonal distance D of the hexagonal cross-section of the container cavity and that the rotating rate of the container should be set as follows, depending on the pressure acting on the shearing site. Ram travel a revolution of the container should be more than 5mm and 1.5mm when the pressure is 98MPa and 147MPa, respectively. Based on the findings above, continuous consolidation of the aluminum powder by means of step-by-step operation of the devised extrusion method was experimented. In the experiment, an extrusion die with a cross-sectional reduction of 11.5% was used and material feeding was done with pre-compacted powder billets formed by the pressure 147MPa. Contrary to expectation, all the experiments tried ended in failure. The cause of the failure is a sharp increase of extruding force, which made an intrusion of the aluminum powder into the gap between the container and punch and prevented the successive feeding of the material. The failure of the experiment prevented the influence of processing conditions on product's property from being investigated. However, the experiments showed that the boundary produced between the billets fed is completely removable by the introduction of the shear deformation. The findings in the former part of this study have been published, but those in the latter have not yet.

为了实现金属基粉末的附加剪切变形挤压，研究了通过附加剪切变形促进金属粉末之间的粘附，设计了一种分离式旋转挤压容器。从用粒度为20-42目的铝粉理想地引入剪切变形的基本实验中发现，关于旋转容器的形状，其筒长L应大于容器空腔的六边形横截面的最短对角线距离D，并且容器的旋转速率应设定如下：这取决于作用在剪切部位上的压力。当压力为98 MPa和147 MPa时，容器的冲头行程应分别大于5 mm和1.5mm。在此基础上，对设计的挤压法分步连续固结铝粉进行了实验研究。实验中采用断面收缩率为11.5%的挤压模，以147 MPa压力下压制成型的预压实粉坯为原料进行喂料。出乎意料的是，所有尝试过的实验都以失败告终。失效的原因是挤压力急剧增加，使铝粉侵入容器与冲头之间的差距，阻碍了材料的连续进给。实验的失败阻碍了工艺条件对产品性能影响的研究。然而，实验表明，通过引入剪切变形，在坯料之间产生的边界是完全可消除的。这项研究的前一部分的结果已经发表，但后一部分的结果尚未发表。