在塑性變形中圓環鍛粗為最常用來探討摩擦因子之方法，由Kunogi[1]文獻中發現其6:3:2(外徑:內徑:高度)為最常用之圓環比例，上述比例圓環稱之為標準圓環。故本文利用車削製作出標準圓環比例，不同尺寸大小的圓環試片來進行圓環鍛粗加工實驗，探討其圓環試片之實驗結果，針對試片尺寸的不同，其變形結果是否會因尺寸效應的存在而造成摩擦因子的變化為研究重點。In plastic deformation, ring upsetting is the most common approach to study friction factors. In the research of Kunogi[1], 6:3:2(outer diameter: inner diameter: height) is considered the most commonly used scale of ring. Rings with the scale mentioned above are called standard rings. In this paper, we use turning to produce ring specimens with the standard scale and in different sizes to conduct ring upsetting experiments. From the experimental result of ring specimens, this paper aims at studying whether the deformation that results from the difference of sizes of specimens result due to the size effects caused by changes in the friction factor for research focus.
