Local ending point-based numerical control system speed controlling method

Abstract

The invention relates to a local ending point-based numerical control system speed controlling method, which comprises the steps of drawing a maximum speed curve by obtaining theoretical maximum speeds of all small line sections through computing, selecting a local ending point accordingly, sectioning the processing path by the local ending point, and performing a speed increasing or reducing plan on the sectioned path unit by a system. The method disclosed by the invention plans related continuous multiple sections of small line sections instead of a single small line section every time, thus avoiding frequent speed increasing and reducing, preventing easy generating of relatively large vibrating of a lathe and improving the machining efficiency; and after the method is used for planning the speed, speed increasing and reducing profiles can be sectional or a certain table instead of being analytic functions, and symmetrical speed increasing and reducing processes are not needed.

Description

technical field [0001] The invention relates to a speed control method of a numerical control system based on a local end point, and belongs to the technical field of speed control of a numerical control system. Background technique [0002] CAD / CAM systems often use small straight segments instead of curves to achieve trajectory fitting. Each small segment of trajectory is usually composed of three parts: acceleration process, uniform motion, and deceleration stop. This will cause frequent acceleration and deceleration of the motor, making the machine tool prone to serious problems. Large vibration reduces processing efficiency. [0003] The focus of machining path speed planning is to require the machine tool to move along a given trajectory, while the speed has a certain form of envelope. For example: trapezoidal, S-shaped, exponential, etc., but also to meet the constraints of the maximum speed and acceleration. Trapezoidal and S-shaped curve algorithms can only be app...

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Problems solved by technology

[0004] In view of the existing defects, the purpose of the present invention is to solve the problem that the line segment planned each time in the speed planning process is a separate segment, the acceleration and deceleration profile is required to be an analytical function, the acceleration and deceleration process is symmetrical, and the speed shape is fixed after planning. A numerical control system speed control method based on a local end point, which uses several small straight line segments in the same acceleration segment or deceleration segment as a path unit for a speed planning, which greatly reduces the acceleration and deceleration frequency of the system, reduces the vibration of the system, and improves System operating efficiency

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