Fundamental Research on Water-Soluble Cutting Fluids for Hobbing : 3rd Report, Effect of pH

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  • ホブ切り用水溶性切削油剤に関する基礎的研究 : 第3報,pHの影響
  • ホブキリ ヨウ スイヨウセイ セッサク ユザイ ニ カンスル キソテキ ケンキュウ ダイ3ポウ pH ノ エイキョウ

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Abstract

This paper presents the influence of pH of water-soluble cutting fluids with and without synthetic lubricating additive for hobbing; Fluid A and Fluid B, on the cutting performance; flank wear, crater wear and finished surface roughness. Experiments were conducted by simulating hobbing by fly tool cutting on a milling machine. The following results were clarified: (1) When using both Fluid A and Fluid B, the flank wear decreases with decreasing pH, in which the Fluid A having pH 8.0 and the Fluid B having pH 9.0 showed the smallest flank wear width not only at cutting speed of 117m/min, but also at 159m/min. (2) The crater wear obtained with the Fluid A decreases with decreasing pH, but that obtained with the Fluid B increases with decredasing pH at cutting speed of 117m/min. At 159m/min, the crater wear could not be measured because of adhesion of deposited metal on the face. (3) The finished surface roughness is small from the beginning of cutting to the end of cutting in the case of pH 8.0 of the Fluid A at cutting speed of 117m/min. It is big and shows no difference even when changing pH at 159m/min. (4) From the view points of the tool wear and the finished surface roughness, pH 8.0 of the cutting fluid with synthetic lubricating additive is effective.

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