Machining device

A machining device, which is adapted to be installed on a mount, wherein the mount is provided with a spindle and a toolholder provided on the spindle;

• the toolholder is controllable to rotate and is adapted to be engaged with a tool;
• the machining device comprising:
• a primary coil module comprising a first ferrite core and a first coil, wherein the first ferrite core is engaged with the toolholder;
• the first coil is modular molded, and is detachably engaged with the first ferrite core;
• the first coil has a first hollow portion which is adapted to be passed through by a part of the first ferrite core;
• a piezoelectric actuator which is electrically connected to the primary coil module and is engaged with the toolholder to be controlled to drive the tool to vibrate;
• and
• at least one secondary coil module which is adjacent to the primary coil module, and comprises a second ferrite core and a second coil, wherein the second coil is modular molded and is detachably engaged with the second ferrite core;
• the second coil has a second hollow portion which is adapted to be passed through by a part of the second ferrite core;
• wherein the first ferrite core is provided with a second frame and a second flange extending outwardly from a surface of the second frame in a radial direction of the first ferrite core;
• the first coil is engaged with an outside of the second frame, and an end of the first coil abuts against the second flange;
• wherein the primary coil module comprises a sleeve fitting around the toolholder;
• the sleeve comprises a first frame and a first flange connected to a bottom edge of the first frame;
• the second frame of the first ferrite core fits around an outside of the first frame, and the second flange of the first ferrite core abuts against the first flange.