Compared with the three-dimensional vibration grinder, the two-dimensional vibration grinder lacks the three-dimensional vibration function; when the workpiece, the shaped grinding block, the chemical grinding fluid and water are put into the container of the polishing machine in a certain proportion. Then start the vibration motor. The upper and lower ends of the vibration motor shaft are equipped with eccentric iron blocks, and their projections on the horizontal plane form a right angle to each other. When the vibration motor rotates at a high speed, the two eccentric blocks produce an exciting force (centrifugal force) that varies in the horizontal plane along the circumferential direction. , So that the body produces circular motion in the horizontal plane, and at the same time, the excitation force does not pass the center of mass of the body. As a result, an exciting moment (ie dumping moment) is generated to make the container swing around the horizontal axis. Because the bottom of the container is in the shape of a ring and the amplitude of each point is inconsistent, the shaped grinding block and the workpiece in the container revolve both on the vertical central axis and around the circle. The center of the ring rolls, and its composite motion is a circular spiral motion. At the same time, the container has a helix angle. The shaped grinding block and the workpiece slide upward along the spiral surface, so that the workpiece and the shaped grinding block increase friction during movement and improve the finishing efficiency.