Processing track local fairing method for synchronous design of geometric fairing and speed planning

A speed planning and processing trajectory technology, applied in computer control, instruments, simulators, etc., can solve problems that do not involve geometric smoothing and speed planning synchronous design

Active Publication Date: 2021-05-28
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, the current local corner smoothing methods do not involve the simultaneous design of geometric smoothing

Method used

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  • Processing track local fairing method for synchronous design of geometric fairing and speed planning
  • Processing track local fairing method for synchronous design of geometric fairing and speed planning
  • Processing track local fairing method for synchronous design of geometric fairing and speed planning

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Embodiment Construction

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0049] As a specific embodiment of the present invention, a method for local smoothing of machining trajectories designed synchronously with geometric smoothing and speed planning, comprising the following steps:

[0050] Step 1: Obtain the upper limit value of the smoothing length of the smoothing curve, specifically:

[0051] From two adjacent straight line segments P i-1 P i an...

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Abstract

The invention discloses a processing track local fairing method for synchronous design of geometric fairing and speed planning. The processing track local fairing method comprises the following steps: 1, acquiring a fairing length upper limit value of a fairing curve; 2, calculating a reachable speed value according to the fairing length upper limit value obtained in the step 1; 3, calculating the shortest fairing length when the normal constraint is satisfied according to the reachable speed value obtained in the step 2; 4, determining the optimal fairing length according to the fairing length upper limit value obtained in the step 1 and the shortest fairing length calculated in the step 3; 5, according to the optimal fairing length determined in the step 4, carrying out fairing curve and speed planning synchronous design. According to the method, on the premise of geometric constraint, the fairing curve is designed according to the actual reachable speed, so that contour errors are reduced on the premise that the processing efficiency is ensured by a synchronous design strategy. The method has important significance in occasions with important machining efficiency and contour precision.

Description

technical field [0001] The invention belongs to the field of trajectory interpolation of numerically controlled machine tools, and in particular relates to a local smoothing method of a machining trajectory designed synchronously with geometric smoothing and speed planning. Background technique [0002] Computer-aided design software often uses parametric spline curves such as NURBS to design complex surface parts, but few CNC systems can directly process them. Computer-aided manufacturing software usually discretizes the parameter curve into continuous small line segment trajectories to meet the processing format requirements of the CNC system. However, the speed direction at the point where the line segments connect is discontinuous, and the speed of the CNC machine tool is required to drop to zero at this point. This frequent acceleration and deceleration will lead to frequent changes in the amount of cutting during machine tool processing, which will easily cause chatte...

Claims

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Application Information

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IPC IPC(8): G05B19/41
CPCG05B19/41
Inventor 梅雪松赵飞黄晓勇陶涛盛晓超
Owner XI AN JIAOTONG UNIV
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