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Don't confuse the nc lathe coordinate system of the concept

by:SNK     2020-08-22
Nc lathe coordinate system concept don't confuse release time: 2019 - 10 - 10 clicks: 394 times the nc lathe coordinate system concept don't confuse when nc lathe programming, in order to describe the movement of the numerical control lathe, simplify the programming method and ensure interchangeability record data, numerical control lathe coordinate system and direction have been standardized, ISO and drew up naming standards in our country. Through this part of the study, can grasp the nc lathe coordinate system, programming the concept of coordinate system, the processing, have the ability to hands-on set numerical control lathe processing coordinate system. Know before understand the nc lathe coordinate system under a few basic concepts: 1. Origin of the machine: machine tool coordinate system origin or machine zero point. Origin of the machine tool is a fixed point on the machine. Defined as origin of the lathe machine tools spindle rotation axis with the front end face of intersection or reference point. 2. Machine tools reference points: the first step in the boot after operation, called back to the reference point, used to determine the machine tool coordinate system. Reference points for machine tool on a fixed point. Its fixed position, by X axis and Z axis of machine stop and the motor to determine the zero position, mechanical block is usually set in the Z axis is biggest position. When carries on the back to the operation of the reference point, mounted on the vertical and horizontal dragging plate trip switch, after touching the stop signal to the numerical control system, by the system control board to stop movement, to complete the operation of the reference point. Machine and the machine tool reference points can overlap, also can not overlap, through parameter specifies the machine tools reference points to zero distance. 3. Program origin: programmers in the programming, used in selection of a known point on the workpiece. Program at the origin of the workpiece coordinate system origin, the starting point, that is, the processing procedure, points is artificial. Depends on the size should not only conform to the pattern set by tagging habits and to facilitate programming. So when programming, identify design basis points on the pattern first commonly, and often work to that point as the origin of the numerical control lathe workpiece origin usually selected in the left transverse axis and the right end face of artifacts, or jaw on the front of the intersection point below. General with the right end face of work and the axis of the work as the origin of the intersections. 4. When the workpiece coordinate system, the programmer the origin in the selected program established a new coordinate system. If the origin of the workpiece as the origin of coordinates, the establishment of a rectangular coordinate system with the z axis x axis, then the coordinate system is called a coordinate system. In addition, once the workpiece coordinate system is established effective until the replaced by the new workpiece coordinate system. 5. Machine tool coordinate system: machine tool factory has certain coordinate system. If the origin of the machine tool as the origin of coordinates, the establishment of a rectangular coordinate system with the Z axis X axis, then the coordinate system is called the machine tool coordinate system. When the point of reference for the machine to complete operation, namely, to establish the machine coordinate system. The determination of numerical control lathe numerical control lathe coordinate system: 1. Numerical control lathe on the regulation of relative motion in the numerical control lathe, we always think that the workpiece stationary, and the cutting tool movement. Such programming without considering on nc lathe workpiece and cutting tool movement, can according to the parts drawing, to determine the numerical control lathe machining process. 2. Standard prescribed by the nc lathe coordinate system of the nc lathe coordinate system X, Y, Z axis relationship with the right hand of the cartesian rectangular coordinate system. On the CNC numerical control lathe, numerical control lathe movement is controlled by the CNC devices to, in order to determine the forming on the nc lathe and auxiliary movement, must first determine the numerical control lathe on the movement of the displacement and the direction of the movement, this needs through coordinate system, the coordinate system is called numerical control lathe. Standard CNC lathe coordinate system X, Y, Z axis relationship with the right hand of the cartesian rectangular coordinate system: (1) right hand thumb and forefinger and middle finger, and are 90 & deg; 。 The thumb on behalf of the X coordinates, the finger represent Y coordinates, middle finger on behalf of the Z coordinate. (2) the thumb pointing to X coordinate direction, the index finger pointing to the Y coordinate direction, the middle finger pointing to Z coordinate direction. (3) around the X, Y, and Z coordinates, the rotation of the rotating coordinates are expressed in A, B, C, respectively, according to the right hand screw rule, thumb pointing to the X, Y, and Z coordinates of any axis forward, then the rest of the four refers to the direction of rotation is the rotation coordinates are A, B, C. 3. Direction rules increase distance in the direction of the cutter and workpiece is the positive direction of axis.
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