Complex curved surface five-axis flat-bottomed cutter strip-width-maximization machining feedrate offline programming method

A technology for wide-row machining and complex curved surfaces, which is applied in the field of off-line planning of feedrates for five-axis flat-bottomed knife wide-row machining of complex curved surfaces, and can solve the problems of reducing the surface quality of parts and tool life, unstable processing process, and reducing processing efficiency.

Inactive Publication Date: 2016-04-27
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

If the given feed rate is too high, that is, exceeding the speed, acceleration and jerk limits of each movement axis of the machine tool, it will make the machining process unstable, reduce the surface quality of parts and tool life; if the given feed rate is too low, Greatly reduce processing efficiency

Method used

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  • Complex curved surface five-axis flat-bottomed cutter strip-width-maximization machining feedrate offline programming method
  • Complex curved surface five-axis flat-bottomed cutter strip-width-maximization machining feedrate offline programming method
  • Complex curved surface five-axis flat-bottomed cutter strip-width-maximization machining feedrate offline programming method

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Embodiment

[0042] This embodiment provides a method for off-line planning of feedrate for five-axis flat-bottomed knife width machining on complex curved surfaces, including the following steps:

[0043] Step S1, read in the discrete tool positions in the first row of tool paths corresponding to the designed curved surface, and obtain the discrete positions of each movement axis (hereinafter referred to as each axis) of the machine tool after inversion of the kinematics of the machine tool;

[0044] Step S2, use 3 times B-spline curve to interpolate the discrete positions of each axis of the machine tool, sample the curve parameter interval at equal parameter intervals, and establish the time minimum that satisfies the speed, acceleration, jerk limit constraints and curve bow height error constraints of each axis of the machine tool. Optimal feed rate planning model; use the existing linear programming method to solve the model, and obtain the maximum feed rate that meets the performance ...

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Abstract

The present invention provides a complex curved surface five-axis flat-bottomed cutter strip-width-maximization machining feedrate offline programming method. The method comprises a step of calculating the position of machine tool each shaft corresponding to each discrete cutter position in a cutter rail according to a machine tool kinematics model, a step of establishing a time optimal feeding speed model with the speed, acceleration, jerk limit and curved arch height error of the machine tool each shaft as constraints, and obtaining the maximum feeding speed which satisfies machine tool performance of each cutter position in the cutter rail, a step of using a discrete vector intersection method to determine a cutter participation cutting zone and cut-in and cut-out angles and estimating the total cutting force of the cutter on the above basis, a step of establishing a feed speed optimization model with a maximum feeding speed as a target, the maintenance of the maximum cutting force in the cutter cutting process around a given cutting force threshold value as a constraint, and the satisfaction of a condition that a feeding speed is smaller than the maximum feeding speed, and obtaining the feeding speed of a cutter position by using a dichotomy solution model, and a step of outputting an NC code according to a concrete NC system. The method is suitable for the rough and fine processing of a free curved surface.

Description

technical field [0001] The invention relates to the technical field of free-form surface processing of a five-axis numerically controlled milling machine, in particular to an off-line planning method of a feedrate for five-axis flat-bottomed knife wide-row machining of complex curved surfaces satisfying the kinematic performance and cutting force constraints of a machine tool. Background technique [0002] In the field of mechanical manufacturing, five-axis CNC milling machines are widely used in the processing of complex curved surface parts such as impellers, propellers, and turbine blades. Compared with the ball-end cutter, the processing efficiency of the flat-bottom cutter is significantly improved, and the cutting width can be increased by adjusting the tool posture, and it is widely used in five-axis wide-row machining of complex curved surfaces. The size and change of feed speed in five-axis CNC machining have an important impact on the machining accuracy, surface qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/4097
CPCG05B19/4097G05B2219/32104Y02P90/02
Inventor 朱利民卢耀安丁烨黄杰
Owner SHANGHAI JIAO TONG UNIV
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