Speed control method for numerical control system in consideration of small line segment and connection point speed

Abstract

The invention relates to a speed control method for a numerical control system in consideration of small line segment and connection point speed. A maximum speed curve is drawn by obtaining theoretical maximum speed of all small line segments and connection points through calculation, local end points are selected accordingly, a machining path is segmented through the local end points and the system makes acceleration or deceleration speed plans for path units obtained after segmentation. The line segments planned at each time by adopting the method provided by the invention are no longer separate small line segments but relevant continuous multiple small line segments. Therefore, frequent acceleration does not occur, a machine is not easy to generate greater vibration and the machining efficiency is improved; by adopting the method to plan the speed, acceleration and deceleration outlines are not required to be an analytic function and can be segmented or certain tables; and acceleration and deceleration processes are not required to be symmetrical.

Description

technical field [0001] The invention relates to a speed control method of a numerical control system considering the speed of a small straight line segment and a connection 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. Trapez...

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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 that considers the speed of small straight line segments and connection points. It uses several small straight line segments in the same acceleration segment or deceleration segment as a path unit to perform speed planning, which greatly reduces the acceleration and deceleration frequency of the system and reduces the system time. vibration, and improve system operating efficiency

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