Abstract Point-attack picks have been widely used in mechanical excavators, such as roadheaders, long-wall shearers, and trenching cutters. Different parameters (i.e., cutting conditions and mechanical properties of the rock) affect the cutting performance of point-attack picks. Among the parameters, skew angle is an important parameter that affects the cutting performance (i.e., cutter forces and specific energy, SE), cutting stability, and wear of the cutting tool. However, few studies regarding the effect of the skew angle on the cutting performance and cutting stability have been reported, and the results of the previous studies are insufficient to conclude the general effect of the skew angle owing to the differences in their results. This study focuses on the effect of the skew angle of point-attack picks on the cutting performance and cutting stability; linear cutting tests were performed for selected rock type with different skew angles and penetration depths. The changes in the cutter forces, SE, ratios of three-directional cutter forces with the skew angle were evaluated. The results showed that the magnitude of the skew angle affected the pick forces, especially the side force component, their ratios, and SE as well. By contrast, the effect of the skew angle direction did not significantly affect the results. The results indicated that the effect of the skew angle (magnitude and direction) on the cutting performance, cutting efficiency, and wear behavior might vary depending on the rock, cutting tool, and other cutting conditions. The results from this study will be useful for better understanding the effects of the skew angle on the cutting performance and stability, which can be used for optimizing the design parameters of mechanical excavators.

中文翻译：

---

倾斜角度对点攻型截齿切削性能和切削稳定性的影响

摘要 点攻镐已广泛应用于掘进机、长壁采煤机、挖沟机等机械挖掘机。不同的参数（即岩石的切削条件和力学性能）影响点攻镐的切削性能。在参数中，倾斜角是影响切削性能（即刀具力和比能，SE）、切削稳定性和刀具磨损的重要参数。然而，关于斜角对切削性能和切削稳定性影响的研究鲜有报道，由于研究结果存在差异，前人的研究结果不足以得出斜角的一般影响。本研究重点研究了点攻截齿倾斜角度对切削性能和切削稳定性的影响；对具有不同倾斜角度和穿透深度的选定岩石类型进行了线性切削试验。评估了刀具力的变化，SE，三向刀具力与倾斜角的比率。结果表明，倾斜角的大小会影响拾取力，尤其是侧向力分量、它们的比率和 SE。相比之下，倾斜角度方向的影响对结果没有显着影响。结果表明，倾斜角（大小和方向）对切削性能、切削效率和磨损行为的影响可能因岩石、切削刀具和其他切削条件而异。