材料期刊网

为了解决目前盾构机用刀圈因淬火后硬度高而引起的铣削加工过程中刀具易崩刃、加工效率低等问题,本文通过用铝含量高的AlTiN涂层硬质合金铣刀来替代铝含量低的TiAlN涂层硬质合金铣刀,并对铣刀进行优化设计,同时调整铣刀切削时的线速度和吃刀量,在数控加工中心上对淬火刀圈铣削工艺进行研究,结果表明:采用结构为4刃、螺旋角为30°、刀尖圆角半径R为1 mm的中12 mm整体硬质合金铣刀,进行AlTiN涂层,当径向吃刀量为0.5 mm、轴向吃刀量为1 mm、切削线速度为49 m/min、进给量为0.28 mm/r时,铣削硬度为HRC58～59的淬硬钢,铣刀刃磨一次的使用寿命可由原来的2h提升到5h,降低了刀具的消耗.

In order to solve the problems including the blade tipping and low processing efficiency during the milling process of cemented carbide milling tool for the shield cutter ring with high hardness after quenching,the cemented carbide milling tool with AlTiN coating composed of higher aluminum content was used instead of that with TiAlN coating composed of lower aluminum content.The structure of the milling tool was optimized.Through simultaneously adjusting the linear velocity and back engagement of the milling tool,the milling process for the quenched cutter ring was researched in NC machining center.The results show that,by using optimized φ12 mm solid carbide milling tool with four cutting edges,spiral angle of 30 degrees and tip round radius of 1 mm,followed by coated with AlTiN.When choosing the radial engagement of 0.5 mm,the back cutting depth of 1 mm,the cutting line speed of 49 m/min and the feed rate of 0.28 mm/r,the service life of the coated milling tool for milling hardened steel (HRC 58～59) can be prolonged from 2 h to 5 h before blade grinding is needed,thus the consumption of the tool is decreased.