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为了使毫米波波导的电损耗减至最少的限度,波导表面应敷一层表面光洁度小于0.1微米(R_(max)的银层,而且波导的尺寸精度应保持在10微米以内的范围。目前的发展方向是采用敷银板冷挤压的方法,其目的是旨在建立一种经济加工波导的方法。本文讨论用奥米加(Ω)形和U形冲头挤压敷银板的铜坯件,研究坯件金属的流动情况以确定精密成形所必须的条件,例如研究冲头的形状和铜坯件的硬度特性等。业已发现,采用一个带肩膀的冲头可以实现精密成形。用一个带肩膀的冲头压波导的上自由面,然后在波导最弯曲处的中心点伸进一个辅助冲头,这样便可以修正波导的起始形变。
In order to minimize the electrical losses of the millimeter waveguides, the surface of the waveguide should be coated with a layer of silver with a surface finish of less than 0.1 micrometer (R_max) and the dimensional accuracy of the waveguide should be kept within 10 micrometers. The development direction is the method of using cold extrusion of silver plate, the purpose of which is to establish a method of economically processing waveguides.This paper discusses the use of Omega (Omega) -shaped and U-shaped extrusion of copper foil blank To study the flow of the billet metal to determine the conditions necessary for precision forming such as the shape of the punch and the hardness characteristics of the copper billet etc. It has been found that a shoulder punch can be used for precision forming, The shouldered punch presses the upper free surface of the waveguide and then inserts an auxiliary punch at the center of the most curved part of the waveguide so that the initial deformation of the waveguide can be corrected.