Internal, active, and compensatory method and device for the rotational main-shaft of a cutting tool with axial bias-and-swing

An internal, active, and compensatory device for the axial bias-and-swing of the main shaft of a cutting includes:

• a main-shaft device, which is further comprised of:
• a mandrel;
• a cutting tool, which is connected to a forward end of the mandrel;
• and
• a motor rotor, which is connected to the mandrel to bring along the mandrel and the cutting tool to rotate;
• and
• an active compensatory device, which is connected to the main shaft for providing an axial displacement compensation to the cutting tool, and which is further comprised of:
• a sensor, which detects the cutting tool and is kept a distance from the cutting tool, and which senses the displacement quantity of the axial bias-and-swing of the cutting tool
• an activation module, to provide an axial force to the mandrel, such that the mandrel makes an axial displacement of small amplitude;
• and
• wherein the activation module is further comprised of:
• a magnetic element, which is fixed to the rear end of the mandrel;
• and
• an electromagnetic element, which is located at a position rearward of the magnetic element and is kept at a distance from the magnetic element, and which receives the electric-power input controlled by the electromagnetic controlling module to thereby generate magnetic force;
• and
• an electromagnetic controlling module, which is connected to the activation module, and which receives the displacement quantity of the axial bias-and-swing transferred from the sensor to thereby control the activation module.

An internal, active, and compensatory method for the axial bias-and-swing of the main shaft of a cutting tool is comprised of following steps:

• (A) Provide an active compensatory device to be arranged at a main-shaft device, which is comprised of a mandrel, a cutting tool connected to a front end of the mandrel, and a motor rotor connected to the mandrel to bring along the mandrel and rotate the cutting tool, and the active compensatory device is comprised of a sensor that is selected to sense the quantity of the axial displacement of the bias-and-swing of the cutting tool, an actuation module that is selected to drive the mandrel to process an axial displacement of small amplitude, and an electromagnetic module that is selected to receive the quantity of axial displacement of the bias-and-swing transferred from the sensor and thereby control the actuation module;
• (B) The sensor detects the quantity of the axial displacement of the bias-and-swing of the cutting tool and transfers the displacement quantity of the bias-and-swing to the electromagnetic controlling unit;
• (C) According to the displacement quantity of the bias-and-swing, the electromagnetic module correspondingly calculates the displacement quantity of the axial compensation;
• (D) The electromagnetic controlling module controls the actuation module to drive the mandrel to process the axial displacement of the displacement quantity of compensation;
• (E) Provide a magnetic element, which is fixed to the rear end of the mandrel;
• and
• an electromagnetic element, which is located at a position rearward of the magnetic element and is kept at a distance from the magnetic element, and which is selected to receive the electric-power input controlled by the electromagnetic controlling module to thereby generate magnetic force.