Small line segment-based speed curve planning method suitable for cutting tool of numerical control device

A speed planning and numerical control device technology, applied in the numerical control field, can solve the problems of reducing processing quality and processing efficiency, frequent fluctuation of kinematic curve, short length of speed planning unit, etc., to reduce speed fluctuation and tool shaking, shorten processing time, The effect of reducing processing time

Active Publication Date: 2018-07-20
YANTAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has obvious defects: (1) When the length of the small line segment is short, the length of the speed planning unit in the speed planning process is too short
These defects will lead to frequent fluctuations in the kinematic curves generated by the tools of CNC machine tools
During the processing, the frequently fluctuating processing speed leads to uneven force on the tool on the machine tool, causing tool vibration, and leaving unnecessary tool marks on the surface of the workpiece, reducing the processing quality and processing efficiency

Method used

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  • Small line segment-based speed curve planning method suitable for cutting tool of numerical control device
  • Small line segment-based speed curve planning method suitable for cutting tool of numerical control device
  • Small line segment-based speed curve planning method suitable for cutting tool of numerical control device

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Embodiment 1

[0065] The GJ301 numerical control system produced by Shenyang High-precision CNC Intelligent Technology Co., Ltd. adopts the Inter Atom N450 processor with a main frequency of 1.66GHZ, 512MB memory, and RTlinux real-time system, and the interpolation period is 0.2ms. Using GJ301 numerical control system to implement a method of smooth compression of the tool path, figure 1 is the graph corresponding to the tool path of the workpiece to be processed,

[0066] Specific steps are as follows:

[0067] (1) Determine the threshold speed value at each corner on the processing path.

[0068] Such as figure 2 As shown, P i-1 , P i , P i+1 Three consecutive instruction points on the toolpath described by a small line segment, corner ∠P i-1 P i P i+1 with size α, the vector P i A to P i-1 P i a unit vector in the direction, vector P i B to P i P i+1 Unit vector in direction, vector AB is vector P i A and vector P i The difference of B, then the corner ∠P i-1 P i P i+...

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Abstract

The invention discloses a small line segment-based speed curve planning method suitable for the cutting tool of a numerical control device and relates to a small line segment machining technology in the numerical control technological field. According to the method, velocity planning units are combined, so that the number of determined velocity planning units can be decreased. In a traditional speed planning process, at the starting position of each velocity planning unit, accelerated velocity increases to a maximum value allowed by the system from zero, and decreases to zero at the terminating position of the velocity planning unit. Since the number of the velocity planning units is decreased, and a new speed planning method is adopted, time taken by the change process of the acceleratedvelocity during a machining process can be effectively reduced; and since the velocity planning units are combined, the length of the path of the cutting tool corresponding to a combined new speed planning unit is increased, so that during the machining process, the machining speed of the cutting tool can be maintained for a long time at a maximum value point, and therefore, machining quality is improved, machining time can be effectively reduced, and machining efficiency can be increased.

Description

technical field [0001] The invention relates to a small line segment processing technology in the technical field of numerical control, in particular to a speed curve planning method suitable for a small line segment of a tool of a numerical control device. Background technique [0002] Free curves and free-form surfaces are widely used to describe mold cavities, auto parts and aeronautical structural parts. However, except for a few types of high-end CNC machine tools, existing CNC machine tools cannot directly process free curves and free-form surfaces. In order to solve this problem, the manufacturing field uses small line segments to approximate free curves and free-form surfaces, and then generates corresponding NC programs that describe the tool's running path during machining. In the actual CNC machining process, the existing technology performs speed planning according to the length of the small line segment, generates a kinematics curve, and controls the movement sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/416
CPCG05B19/4163G05B2219/36521
Inventor 孙树杰
Owner YANTAI UNIV
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