(1. 湖南工程學院機械系， 湘潭411104；
2. 湘潭風動機械廠，湘潭411103)
摘 要: 研制了一種具有Cr-Ni-Mo新配比的低碳合金鋼作為液壓鑿巖機沖擊活塞用材，與常規(guī)活塞用材進行了金相組織、靜強度、熱處理后的表面和斷面顯微硬度及工業(yè)性對比試驗，測試了鑿巖機沖擊性能。結(jié)果表明：該材料具有良好的淬透性、合理的金相組織和斷面硬度分布以及較好的力學性能。還提出了應(yīng)用鑿巖機活塞沖擊應(yīng)力波波值系數(shù)初步評估所設(shè)計活塞性能的方法。
關(guān)鍵字: 液壓鑿巖機；沖擊活塞；低碳合金鋼；應(yīng)力波
（1. Machinery Department, Hunan Engineering Institute, Xiangtan 411104, P.R.China;
2. Xiangtan Pneumatic Machinery Manufacturer, Xiangtan 411103, P.R.China）
Abstract:A kind of low carbon containing alloy steel with composition (mass fraction, %) of 25CrNi3MoA was developed for making hydraulic drill piston which experiences long period cyclic impact stress. The experimental piston was made according to the designed sizes. Then heat treated, sampled and studied using microscopy and the results were compared with those of another piston made with conventional low alloy steels. Metallographic studying and industrial tests show that the experimental piston has very good microstructures and properties, and its working life exceeds 400h with a total drilled hole length of 25500m in a coal mine, which is about 3 times of that of the comparing piston made by conventional low alloy steel. In addition a method of using stress wave coefficient, φK, to evaluate preliminarily the designed piston was proposed.
Key words: hydraulic rock drill; impact piston; low carbon containing alloy steel; stress wave
