Active machining method for clamping deformation of thin-walled special-shaped workpieces

A technology of active processing and thin-walled parts, which is applied in the direction of instruments, computer control, simulators, etc., can solve the problems of affecting the processing accuracy, no processing process, poor rigidity, etc., and achieve the effect of improving accuracy and reducing cutting deformation

Active Publication Date: 2014-10-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Because thin-walled parts, especially large thin-walled special-shaped parts, have small wall thickness, poor rigidity, and complex shapes, they are prone to large deformation during clamping, which affects their processing accuracy. In the past, there was no complete set of thin-walled parts. The processing flow, in order to reduce the processing deformation, the most used method is to use multiple corrections, but this cannot fundamentally avoid deformation

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  • Active machining method for clamping deformation of thin-walled special-shaped workpieces
  • Active machining method for clamping deformation of thin-walled special-shaped workpieces
  • Active machining method for clamping deformation of thin-walled special-shaped workpieces

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Embodiment Construction

[0017] The preferred technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] An active processing method for clamping deformation of thin-walled special-shaped parts of the present invention includes clamping force optimization calculation, auxiliary support position optimization calculation, and active pre-compensation for clamping deformation. The specific operation process is as follows: figure 1 shown.

[0019] figure 2 Shown is the calculation process of clamping force optimization based on the finite element method in the present invention.

[0020] A step-E step:

[0021] Step 210: Using relevant knowledge of theoretical mechanics, using force vector and moment balance equations, analyzing the pressure, support reaction force and friction force on the thin-walled part, and roughly calculating the initial clamping force of the thin-walled part.

[0022] Step 220: Based on the initial clamp...

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Abstract

The invention discloses an active machining method for clamping deformation of thin-walled special-shaped workpieces. Firstly, clamp force of a thin-walled machined workpiece undergoes optimal settings; secondly, force point range of the workpiece is found out; thirdly, ancillary shoring of the workpiece is carried out; and finally, compensation data is introduced into a numerical control program. In comparison with the prior art, the active machining method for clamping deformation of thin-walled special-shaped workpieces can be used to analyze a thin-walled workpiece before numerical control machining, determine magnitude of the clamp force and find clamp pint and supporting point of the workpiece. By increasing or decreasing cutter compensation, clamping of workpieces is stabilized, cutting deformation of workpieces is minimized, and precision is further raised.

Description

technical field [0001] The invention relates to a workpiece processing control method, in particular to an active processing method for clamping deformation of thin-walled special-shaped parts. Background technique [0002] In the CNC machining of thin-walled parts, the clamping accuracy of the parts to be processed is one of the key links that affect the quality and efficiency of parts processing. Because thin-walled parts, especially large thin-walled special-shaped parts, have small wall thickness, poor rigidity, and complex shapes, they are prone to large deformation during clamping, which affects their processing accuracy. In the past, there was no complete set of thin-walled parts. In order to reduce the processing deformation, the most used method is to use multiple corrections, but this cannot fundamentally avoid deformation. When studying the clamping of thin-walled parts, it is necessary to study the factors that may cause clamping deformation from various aspects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/404
Inventor 陈蔚芳刘英智苏宏华何临江薛林峰刘军汤海英朱建伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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