The static reference system of the lathe tool is to determine the spatial position of the points, lines and surfaces of the cutting part of the 7J tool, and people artificially establish a reference auxiliary plane in the non-cutting state as the geometry defined in the tool design, manufacture, sharpening and measurement. parameter.
The stationary frame of reference for the lathe tool. The stationary reference frame consists of the following auxiliary planes:
(1) Base plane P, passing through the selected point of the main cutting edge and perpendicular to the assumed main direction of motion. plane.
It is parallel to a plane in which the tool is sharpened, measured and mounted and positioned, and is perpendicular to the direction of the cutting speed at the selected point.
(2) The main cutting plane corpse. j~Jj The selected point on the main cutting edge is tangent to the projection line of the main cutting edge and perpendicular to the plane of the base surface. It is a plane composed of the direction of the cutting speed and the tangent of the main cutting edge.
The plane passing through the selected point on the minor cutting edge and the projection line of the minor cutting edge and perpendicular to the base surface is called the minor cutting plane ∥.
(3) The orthogonal plane only passes through the selected point on the main cutting edge and is perpendicular to the base plane and the main cutting plane at the same time, which is called the orthogonal plane P. , the fork is called the main section. The plane that the lathe passes through the selected point on the minor cutting edge and is perpendicular to the base plane and the minor cutting plane at the same time is called the minor positive angle plane only.
The above is the stationary reference frame established under normal circumstances, and it will also change in special occasions. For example, when turning a thread with a large thread lift angle, the lathe often uses a normal cutting with the main cutting edge perpendicular to the thread lift angle. At this time, the base plane is parallel to the normal direction, while the lathe cutting plane is perpendicular to the normal phase, etc.