使用单层钎焊金刚石薄壁钻,进行钻磨氮化硅陶瓷的试验。首先研究氮化硅陶瓷材料的去除机理,主要包括脆性去除和塑性去除,且脆性去除占主要部分。其次研究刀具壁厚、主轴转速和钻压对加工效率的影响。结果表明：三个参数存在的最佳值分别...使用单层钎焊金刚石薄壁钻,进行钻磨氮化硅陶瓷的试验。首先研究氮化硅陶瓷材料的去除机理,主要包括脆性去除和塑性去除,且脆性去除占主要部分。其次研究刀具壁厚、主轴转速和钻压对加工效率的影响。结果表明：三个参数存在的最佳值分别为1.5 mm、710 r/min和613 N；并且壁厚不宜超过2 mm,主轴转速不宜超过900 r/min,钻压应在500~705 N 范围内,钻压低于330 N 时刀具会打滑。展开更多
Laser assisted machining is an effective method to machine advanced materials with the added benefits of longer tool life and increased material removal rates. While extensive studies have investigated the machining p...Laser assisted machining is an effective method to machine advanced materials with the added benefits of longer tool life and increased material removal rates. While extensive studies have investigated the machining properties for laser assisted milling（LAML）, few attempts have been made to extend LAML to machining parts with complex geometric features. A methodology for continuous path machining for LAML is developed by integration of a rotary and movable table into an ordinary milling machine with a laser beam system. The machining strategy and processing path are investigated to determine alignment of the machining path with the laser spot. In order to keep the material removal temperatures above the softening temperature of silicon nitride, the transformation is coordinated and the temperature interpolated, establishing a transient thermal model. The temperatures of the laser center and cutting zone are also carefully controlled to achieve optimal machining results and avoid thermal damage. These experiments indicate that the system results in no surface damage as well as good surface roughness, validating the application of this machining strategy and thermal model in the development of a new LAML system for continuous path processing of silicon nitride. The proposed approach can be easily applied in LAML system to achieve continuous processing and improve efficiency in laser assisted machining.展开更多
文摘使用单层钎焊金刚石薄壁钻,进行钻磨氮化硅陶瓷的试验。首先研究氮化硅陶瓷材料的去除机理,主要包括脆性去除和塑性去除,且脆性去除占主要部分。其次研究刀具壁厚、主轴转速和钻压对加工效率的影响。结果表明：三个参数存在的最佳值分别为1.5 mm、710 r/min和613 N；并且壁厚不宜超过2 mm,主轴转速不宜超过900 r/min,钻压应在500~705 N 范围内,钻压低于330 N 时刀具会打滑。
基金Supported by National Natural Science Foundation of China(Grant No.51205097)China Postdoctoral Science Foundation(Grant No.2013M541401)
文摘Laser assisted machining is an effective method to machine advanced materials with the added benefits of longer tool life and increased material removal rates. While extensive studies have investigated the machining properties for laser assisted milling（LAML）, few attempts have been made to extend LAML to machining parts with complex geometric features. A methodology for continuous path machining for LAML is developed by integration of a rotary and movable table into an ordinary milling machine with a laser beam system. The machining strategy and processing path are investigated to determine alignment of the machining path with the laser spot. In order to keep the material removal temperatures above the softening temperature of silicon nitride, the transformation is coordinated and the temperature interpolated, establishing a transient thermal model. The temperatures of the laser center and cutting zone are also carefully controlled to achieve optimal machining results and avoid thermal damage. These experiments indicate that the system results in no surface damage as well as good surface roughness, validating the application of this machining strategy and thermal model in the development of a new LAML system for continuous path processing of silicon nitride. The proposed approach can be easily applied in LAML system to achieve continuous processing and improve efficiency in laser assisted machining.
