Principle Of CNC Machining

- Jul 18, 2018 -

Metal cutting machine tool processing parts, the operator according to the drawing requirements, manual control of the machine tool operating system, constantly changing the relative motion parameters (position, speed, etc.) of the tool and the workpiece, so that the tool removes excess material from the workpiece, and finally obtains the size that meets the technical requirements. Parts with shape, position requirements and surface quality.

The basic working principle of CNC machining is to use the various operations required for the machining process (such as spindle shifting, workpiece clamping, feed, start and stop, tool selection, coolant supply, etc.) and the shape and size of the workpiece. - Digitized code to represent (called digital information), which is then processed and operated by a computer numerical control device. The motion coordinate of the tool and the workpiece is divided into some minimum unit quantity, that is, the minimum displacement amount, and then the numerical control system controls the machine servo drive system according to the requirements of the part program, so that the coordinates are moved by several minimum displacements, thereby realizing the relative relationship between the tool and the workpiece. Exercise to complete the machining of parts. When the workpiece being machined changes, it is only necessary to replace the program in addition to reinstalling the workpiece and replacing the tool.

In the numerical control machining, the numerical control machine tool moves the pulse group of the numerical control device to transmit the motion command to the numerical control machine tool, and each pulse corresponds to the unit displacement of the machine tool. When performing curve processing, a given numerical function can be used to simulate the line segment ΔL. Knowing the type, start point, end point, and velocity of a curve, data is generated between the known points on the ideal trajectory or contour according to a given numerical function, such as a linear function, a circular function, or a high-order curve function. The densification of points determines some intermediate points. This method is called interpolation. The algorithm that handles these interpolations is called an interpolation operation.