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

A numerical control system and speed control technology, applied in the direction of digital control, electrical program control, etc., can solve the problem of reducing the frequency of acceleration and deceleration of the system, and achieve the effect of improving production efficiency

Inactive Publication Date: 2013-08-14
NANJING UNIV OF TECH +3
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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 syste

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

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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] Such as figure 1 As shown, the flow chart of the speed control method of the numerical control system of the present invention. In this embodiment, the speed control method of the numerical control system considering the speed of the small straight line segment and the connection point includes the following steps:

[0021] S1. System settings - set the acceleration of the CNC system = 1200mm / s 2 , take-off speed = 0mm / s, maximum speed V m =1300mm / s, end speed=0mm / s, control period T=0.5ms.

[0022] S2. Discretization of the processing path—assuming that the CNC system runs at the maximu...

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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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Application Information

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IPC IPC(8): G05B19/416
Inventor 舒志兵钱顺华高军虎徐昆李德亮
Owner NANJING UNIV OF TECH
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