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镍基合金螺旋铣孔加工质量研究 预览 被引量:1

Study on Machining Quality of Helical Milling for Nickel-based Superalloy
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摘要 进行了GH4169镍基合金螺旋铣孔加工的正交试验及后续检测,研究了加工质量(尺寸精度、表面质量),并以此探究采用螺旋铣孔工艺替代常规钻孔加工镍基高温合金的可行性。试验及检测结果表明:螺旋铣孔工艺制孔的入口质量良好,无毛刺,但出口处质量稍差,出现了较明显的毛刺;在合理的参数选取范围内,制孔的孔径偏差和圆度偏差能够满足航空工业的要求;孔壁最大表面粗糙度Ra为0. 345μm,远低于常规钻孔的孔壁表面粗糙度,达到了精加工的水平;孔壁表面层出现了一定程度的加工硬化(硬化程度为118. 8%-125. 1%),但并没有出现热软化现象;孔壁表面残余应力表现为压应力(应力范围-902. 0MPa~-396. 3MPa),有利于提高孔的疲劳寿命。因此,螺旋铣孔工艺能够提高镍基高温合金制孔的加工质量,在加工镍基合金时替代常规钻孔工艺是可行的。 Through a series of orthogonal experiments in the helical milling process of GH4169 nickel-based superalloy and some subsequent testing,the machining quality(dimensional quality and surface quality)of helical milling is studied and the feasibility of replacing conventional drilling with helical milling when machining nickel-based superalloy is investigated.The results revealed that the machining quality of hole entry is good without any burr,but the machining quality of hole exit is slightly poor with obvious burrs,the dimensional deviation and roundness deviation of hole can meet the requirement in aerospace industry in the range of reasonable parameters,the maximum surface roughness of hole Ra is 0.345μm, which is much lower than that of hole made by conventional drilling,and reached the level of finishing,the surface layer of hole has a certain degree of work-hardening with hardening capability of 118.8%-125.1%,but no heat softening phenomenon occurs,the compressive residual stress (about -902.0MPa-396.3MPa)can improve the fatigue life.In conclusion,the helical milling technology can improve the machining quality of hole for nickel-based superalloy,and it is fesible to replace conventional drilling with helical milling while machining nickel-based superalloy.
作者 王超 赵军 周咏辉 Wang Chao;Zhao Jun;Zhou Yonghui(School of Mechanical Engineering,Shandong University,Jinan 250061,China)
出处 《工具技术》 2019年第1期51-55,共5页 Tool Engineering(The Magazine for Cutting & Measuring Engineering)
关键词 螺旋铣孔 镍基高温合金 加工质量 helical milling nickel-based superalloy machining quality
作者简介 第一作者:王超,硕士研究生,山东大学机械工程学院,250061济南市;通信作者:赵军,教授,山东大学机械工程学院,250061济南市.
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