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A Method for Generating Machining Trajectory of Free-form Surface Arc Length Parameter Curve

A surface processing and parametric curve technology, which is applied in the field of arc length parameter trajectory generation of free-form surfaces, can solve problems that are difficult to apply to production practice, and achieve the effects of improving smoothness and machining accuracy, reducing difficulty, and avoiding complex calculations.

Active Publication Date: 2020-10-16
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature (Lin K Y, Ueng W D, Lai J Y. CNC codes conversion from linear and circular paths to NURBS curves [J]. International Journal of Advanced Manufacturing Technology, 2008, 39 (7-8): 760-773.) studied the small The CNC machine tool (CNC) machining trajectory composed of line segments and arcs is converted into a non-uniform rational B-spline (NURBS) method, but due to the complexity of non-uniform rational B-spline (NURBS) interpolation and speed planning, the generated non-uniform rational B-spline (NURBS) Uniform Rational B-spline (NURBS) curves are still difficult to apply to production practice

Method used

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  • A Method for Generating Machining Trajectory of Free-form Surface Arc Length Parameter Curve
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  • A Method for Generating Machining Trajectory of Free-form Surface Arc Length Parameter Curve

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Embodiment

[0085] The CNC machine tool used in this embodiment is a three-axis vertical milling machine, and the machine tool body includes a worktable and three linear motion axes of X, Y, and Z.

[0086] The specific operation steps for generating the machining trajectory of the arc length parameter curve of the free-form surface are as follows:

[0087] (1) Processing trajectory extraction of smooth continuous feature free-form surface

[0088] like figure 2 The denture small line segment processing trajectory generated by computer-aided manufacturing software (CAM) including roughing, advancing and retreating and finishing trajectory is shown. First, the overall processing trajectory is carried out according to the chord length feature between adjacent trajectory points of the discrete trajectory of the small line segment. Classification. Perform statistics on the chord length samples to obtain the sample mean and sample variance of the overall trajectory chord length samples

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Abstract

The invention relates to an arc length parameter curve processing track generation method of a free curved surface. The method comprises following steps of smooth and continuous characteristic curve processing track extraction, given precision parameter curve processing track generation and processing track arc length parameterization. In the step (1), processing tracks generated by computer aidedmanufacturing software (CAM) are classified according to arc length characteristics; and discrete free curve processing tracks with smooth and continuous characteristics are extracted; in the step (2), fitting is performed on the extracted discrete free curve processing tracks under the given precision, so parameter curve processing tracks meeting a geometric representation precision requirementare obtained; and in the step (3), by use of the method of continuous iteration arc length re-parameterization, arc length re-parameterization is performed on the parameter curves obtained in the step(2), and finally, the arc length parameter curve free curved face processing track is obtained. According to the invention, the difficulty level in real-time interpolation and speed planning in freecurved face processing is reduced; and smoothness and processing precision in the processing process are improved.

Description

technical field [0001] The invention belongs to the technical field of numerical control machining, and in particular relates to a method for generating a free-form surface arc length parameter trajectory. Background technique [0002] The traditional free-form surface machining mainly uses a large number of discrete small-line segment trajectories generated by computer-aided manufacturing software (CAM), and then realizes it through online smoothing and speed planning. However, with the development of aerospace, automobile and ship fields, the processing requirements for free-form surface parts such as blades and molds are getting higher and higher. However, due to the strict control of online real-time calculation, the traditional free-form surface machining method cannot achieve high-speed and high-precision free-form surface machining, and it is difficult to ensure the contour accuracy and surface quality of the machined surface, and the machining efficiency is low. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/408
CPCG05B19/4086G05B2219/35356
Inventor 卢磊韩江夏链董方方刘海军
Owner HEFEI UNIV OF TECH
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