The influence of milling-burnishing successive and simultaneous processes on the material hardness

4th ModTech International Conference - Modern Technologies in Industrial Engineering

Grigora, C.C.^1 ; Brabie, G.^1 ; Chirita, B.^1

Vasile Alecsandri University of Bacau, Faculty of Engineering, Calea Maraserti 157, Bacau

600115, Romania^1

关键词: Burnishing parameters;    CNC milling machine;    Degradation rate;    Material hardness;    Measured values;    Mechanical process;    Medical implants;    Roller burnishing;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/145/2/022009/pdf
DOI  :  10.1088/1757-899X/145/2/022009

来源: IOP

【 摘 要 】

Recent developments in the field of bio-engineering allow the use of magnesium alloys as a substitute for medical implants. The issue with such alloys is the degradation rate witch has to be improved in order to provide the necessary support for the entire duration of the bone fraction healing. For improving the bone shielding heat treatment does not represent a solution, but chemical and/or mechanical do. One mechanical process that has excellent result is burnishing, but this process is difficult to be implemented on a milling machine. Therefore, it was necessary that a new tool and tool holder to be developed, that allow the simultaneous process to take place. A high-pressure hydraulic roller burnishing tool with a special tool holder was used on a CNC milling machine. The material used for this study is magnesium alloy AZ31B-F, and one of the main purposes was to improve the material hardness (HV). The milling-burnishing parameters that where varied are the speed and feed, burnishing pressure and depth, type of process (successive or simultaneous), machining direction and the material hardness after milling. The results were analyzed as percentage improvement between the milling and burnishing measured values.