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Intermittent milling vibration subsection control method

A segmented control and milling technology, applied in the direction of digital control, program control, electrical program control, etc., can solve the problems of difficult use of the controller, conservative control parameters, excessive controller gain requirements, etc., and achieve high stability discrimination accuracy. , the effect of small controller gain

Active Publication Date: 2020-09-29
HUST WUXI RES INST +1
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Problems solved by technology

Due to the continuous switching between the forced vibration subsystem and the free vibration subsystem in the interrupted milling process, it is difficult to use the controller designed for heavy load or large radial depth of cut, or the control parameters are too conservative, and the controller gain requirement is too large, which cannot be used. To achieve a stable control effect

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  • Intermittent milling vibration subsection control method
  • Intermittent milling vibration subsection control method
  • Intermittent milling vibration subsection control method

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0011] A segmented control method for intermittent milling vibration proposed in an embodiment of the present invention, including:

[0012] Step 1: Carry out time-delay dynamics modeling and segmental approximation for interrupted milling;

[0013] The interrupted milling process is divided into a free vibration period and a forced vibration period according to the contact state between the tool and the workpiece. The free vibration period is naturally stable, while the forced vibration period may be unstable; the two states are modeled separately, and the The linear approximation of the cutting force orientation coefficient in the forced vibration stage is convenient for controller design and analysis;

[0014]

[0015]

[0016] in, represents the free vibration phase, Indicates the forced vibration stage, Ω indicates the rotational speed, b indica...

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Abstract

The invention provides an intermittent milling vibration subsection control method, which comprises the steps of analyzing the cut-in and cut-out process of an intermittent milling cutter, wherein thenon-cutting process is a free vibration state, and the cutting process is a forced vibration state, and carrying out time-lag dynamics modeling and subsection approximation on intermittent milling; designing a controller integrating time lag feedback and state feedback, and allowing an unstable phenomenon to occur in a forced vibration stage by taking the stability of the whole system as a target; and judging the stability based on the linear matrix inequality and the Lyapunov theorem, and determining controller parameters. The method provided by the invention has relatively small controllergain and relatively high stability discrimination precision.

Description

technical field [0001] The invention relates to the technical field of active control of numerical control machining vibration, in particular to a segmental control method for intermittent milling vibration. Background technique [0002] Intermittent milling is a common phenomenon in CNC milling, especially in light-load processing such as thin-walled parts processing and complex curved surface processing. It is characterized in that one rotation cycle can be divided into two stages. The workpiece is in contact with the cutting force, which is forced vibration at this time, and the other is free vibration when the cutter teeth are not in contact with the workpiece and there is no cutting force. On the contrary, there is no switching between these two stages in the heavy-duty or large-diameter deep-cutting method, and the design of the vibration controller is relatively easy, and there are relatively mature controllers at present. Due to the continuous switching between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/19
CPCG05B19/19G05B2219/35349
Inventor 黄涛曹乐叶波龙永胜李海万坤张小明丁汉
Owner HUST WUXI RES INST
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