How to classify the control trajectory classification of high-speed CNC drilling machine motion

The main reasons affecting the dynamic accuracy of high-speed CNC drilling machine are special factors such as machine tool rigidity and vibration resistance. Rigidity refers to the strength of the machine tool's ability to resist deformation under external force. The stronger the rigidity of the machine tool, the higher the dynamic accuracy. The rigidity of the machine tool itself depends on factors such as the characteristics of the data of the machine tool itself. The rigidity between parts is related to the hardness of the processing data, the cross section of the processing data and other factors. In addition, the oscillations on machine tool equipment are usually divided into forced oscillations and self-excited oscillations. Self-excited oscillation is the rigid oscillation of machine tool equipment during normal operation and processing, which is not affected by any external force factors.

There are many types of high-speed CNC drilling machines, and the classification methods are also different. It can usually be classified according to function and structure, according to the control trajectory of motion:

(1) Point control only needs to control the accurate positioning of the moving parts of the machine tool from one point to another point, and does not have strict requirements on the motion trajectory between points. The movement between each coordinate axis is insignificant if there is no machining during the movement. In order to achieve fast and accurate positioning, the movement between two points usually moves quickly first, and then slowly approaches the positioning point to ensure positioning accuracy. This is a point-controlled motion trajectory.

CNC drilling machines, CNC milling machines, CNC punching machines, etc. With point control function. With the development of numerical control technology and the reduction of the price of numerical control systems, numerical control systems purely for point control are rare.

⑵Linear control, also known as parallel control CNC drilling machine, is characterized by controlling the moving speed and route (trajectory) between two related points, in addition to the precise positioning between the control point and the point, but its motion route only moves parallel to the coordinate axis , that is to say, only one coordinate axis is controlled at the same time. During the movement, the tool can cut at a specified feed rate, and generally only rectangular and stepped parts can be processed.

Its linear control functions mainly include relatively simple CNC lathes, CNC milling machines, and CNC grinding machines. This numerical control system is also called linear control numerical control system. Likewise, simple straight-line controls are rarely used.

(3) Contour control is also called continuous control CNC drilling machine, and its control feature is that it can control the displacement and speed of two or more motion coordinates at the same time.

In order to meet the relative motion trajectory of the tool along the workpiece contour and meet the requirements of the workpiece machining contour, the displacement control and speed control of each coordinate movement must be precisely coordinated according to the prescribed proportional relationship.