Lightweight vibration damping cutting tool bar

A lightweight vibration damping cutting tool bar, comprising:

• a cutting tool body (1), wherein a plurality of cavities (5) are opened along a length direction, and the cutting tool body (1) between adjacent cavities (5) has a body-centered cubic (BCC) lattice structure;
• a closed magnetic pole device (3), comprising a plurality of magnetic pole pieces located at a bottom and a side wall of each of the plurality of cavities (5) respectively;
• and
• a pendulum damper (2), wherein the pendulum damper is placed inside the closed magnetic pole device (3) formed by the plurality of magnetic pole pieces, an outer surface of the pendulum damper (2) is provided with a magnetic pole patch (24) corresponding to each of the plurality of magnetic pole pieces one by one, and the magnetic pole patch (24) is set relative to a side with a same polarity of each of the plurality of magnetic pole pieces, so that a magnetic force of each of the plurality of magnetic pole pieces and a magnetic force of the corresponding magnetic pole patch (24) are repelled;
• wherein the pendulum damper (2) comprises:
• a limiting fixture (21), wherein the limiting fixture is placed on a top of each of the plurality of cavities (5) and fixedly connected with the top of each of the plurality of cavities (5);
• a damper (23), wherein the damper has a through hole running up and down in a middle, each of a periphery and a bottom of the damper (23) is provided with a notch, and the magnetic pole patch (24) is fixed in the notch of the damper (23);
• and
• a spring (22), wherein the spring is placed in the through hole of the damper (23), a lower end of the spring is fixed on an upper surface of the magnetic pole patch (24) at the bottom of the damper (23), and an upper end of the spring is fixed on a lower surface of the limiting fixture (21);
• the limiting fixture (21) comprises a limiting cover body and a leg connected to the limiting cover body, ends of each of the plurality of magnetic pole pieces on the side wall of each of the plurality of cavities form a longitudinal narrow channel with an inner wall of each of the plurality of cavities, the leg of the limiting fixture (21) is placed in the longitudinal narrow channel, and an upper surface of the limiting cover body is flush with an upper surface of the cutting tool body (1) and is fixedly connected to the cutting tool body (1).