尺寸效應對於圓環鍛粗加工變形行為之影響

The size effect for ring upsetting forging

蕭喬遠(Chiao-yuan Hsiao)

指導教授 ： 葉維磬

國立中央大學/工學院/機械工程學系/碩士(2012年)

摘要

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。

關鍵字

尺寸效應 ； 標準圓環 ； 摩擦 ； 鍛粗

並列摘要

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.

並列關鍵字

size effect ； standard ring ； upsetting ； friction

參考文獻

[28] 葉哲宇，「以實驗方法建立圓環鍛粗加工的異向性摩擦模型及其驗證」，碩士論文，國立中央大學，中壢，2010年。

[2] Male, A. T. and Cockcroft, M. G., " A method for the determination of the coefficient of friction of metals under conditions of bulk plastic deformation ", J. of the Inst. of Metals, Vol. 93, pp. 38-46, 1965.

[3] Baraya, G. L. and Parker, J., "Determination of the yield surfaces by notched strip specimens ", Int. J. Mech. Sci. 5, pp.353-363, 1963.

[4] Male, A.T. and Depierre, V., " The Validity of Mathematical Solutions for Determining Friction from the Ring Compression Test ", Journal of Lubrication Technology, pp.389-397, 1970.

[5] Lee, C.H. and Altan, T., "Influence of Flow Stress and Friction Upon Metal Flow in Upset Forging of Rings and Cylinders", Journal of Engineering for Industry, pp.775-782, 1972.