Machining device for controlling tool position considering tool wear and method for controlling tool position using the same

A machining device for controlling a tool position considering tool wear which machines a workpiece using a tool disposed at a machining unit, the machining device comprising:

• a tool-moving unit coupled to the machining unit and moving the machining unit to change the position of the tool with respect to the workpiece;
• a supporting unit supporting the workpiece and moving the workpiece to change a position of the workpiece with respect to the tool;
• a sensor unit disposed at the machining unit and measuring a current amount, which is supplied to a machining motor operating the tool, or an operation force of the tool;
• and
• a controller receiving a measurement signal corresponding to the current amount from the sensor unit and transmitting a control signal to the tool-moving unit and the supporting unit,
• wherein the controller controls the tool-moving unit or the supporting unit such that a current contact portion of the tool that comes in contact with the workpiece is changed when a machining load value of the machining unit exceeds a reference machining load value, and
• wherein the sensor unit measures a distance between an end of the tool-moving unit coupled to the machining unit and the workpiece, and
• the controller adjusts the distance between the end of the tool-moving unit and the workpiece based on the machining load value exceeding the reference machining load value so that a portion of the tool other than the current contact portion is used to come in contact with the workpiece.