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
View PDF16 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Intermittent milling vibration subsection control method
  • Intermittent milling vibration subsection control method
  • Intermittent milling vibration subsection control method

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap