Thin-walled workpiece milling chatter restraining method

A technology for milling chatter and thin-walled parts, which is applied in the direction of manufacturing tools, maintenance and safety accessories, metal processing machinery parts, etc., can solve the problems of poor rigidity, small stable range, poor practicability, etc., and achieve high-speed chatter-free The effect of milling, improving the stable domain, and the range of reliable parameter selection

Active Publication Date: 2017-07-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of existing milling stability prediction methods, the present invention provides a method for suppressing chatter in milling of thin-walled parts
The present invention establishes an efficient processing method to improve the stable region of milling by partially modifying the dynamic parameters of the thin-walled parts, and better solves the problem of poor rigidity at both ends of the starting and ending positions of the workpiece and the small range of the stable region , which seriously restricts the selection of processing parameters in the milling process; provides a reliable parameter selection range for high-speed milling of thin-walled parts, and realizes high-speed chatter-free milling of thin-walled parts

Method used

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  • Thin-walled workpiece milling chatter restraining method
  • Thin-walled workpiece milling chatter restraining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The size of the thin plate is 115mm×36mm×3.5mm, the material is aluminum alloy 7075, the modulus of elasticity is 71GPa, and the density is 2810kg / m 3 , Poisson's ratio is 0.33; the cutting tool is a cemented carbide milling cutter with 2 blades, a diameter of 15.875 mm, and a helix angle of 30 degrees. The tool extension length is 78 mm.

[0024] 1. Utilize the milling dynamics model of the thin-walled parts deformed by the cutting tool and the workpiece, divide the cutting tool and the workpiece into 40 microelements along the axial direction, that is, q=41; establish the milling kinetic equation at each microelement respectively, and Find the dynamic milling force:

[0025]

[0026] 2. After installing the tool to the spindle of the machine tool, use the multi-point percussion test method and linear interpolation method to measure the tool feed direction and the modal parameters perpendicular to the feed direction; ζ m,t,x , ζ m,t,y Indicates the damp...

Embodiment 2

[0046] Example 2: The size of the thin plate is 100mm×40mm×4.5mm, the material is aluminum alloy 7075, the modulus of elasticity is 71GPa, and the density is 2810kg / m 3 , Poisson's ratio is 0.33; the cutting tool is a cemented carbide milling cutter with 2 blades, a diameter of 15.875 mm, and a helix angle of 30 degrees. The tool extension length is 78 mm.

[0047] 1. Utilize the milling dynamics model of the thin-walled parts deformed by the cutting tool and the workpiece, divide the cutting tool and the workpiece into 30 microelements along the axial direction, that is, q=31; establish the milling dynamic equation at each microelement respectively, and Find the dynamic milling force:

[0048]

[0049] 2. After installing the tool to the spindle of the machine tool, use the multi-point percussion test method and linear interpolation method to measure the tool feed direction and the modal parameters perpendicular to the feed direction; ζ m,t,x , ζ m,t,y Indicates the damp...

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Abstract

The invention discloses a thin-walled workpiece milling chatter restraining method. The method is used for solving the technical problem that an existing milling stability prediction method is poor in practicability. According to the technical scheme, an efficient machining technological method is built through local modification of the added mass on thin-walled workpiece kinetic parameters for enlarging a stability region of milling, and a reliable parameter selection range is provided for thin-walled workpiece high-speed milling; and finally machining parameters capable of achieving no chatter and high efficiency are selected through an optimization algorithm, and thin-walled workpiece high-speed chatter-free milling is achieved. By means of local modification on the thin-walled workpiece kinetic parameters, the efficient machining method is built for enlarging the stability region of milling, and the problem that rigidity of the two ends of workpiece starting and stop positions is poor, the stability region is small, and selection of machining parameters in the milling process are severely restrained are well solved; and the reliable parameter selection range is provided for thin-walled workpiece milling, thin-walled workpiece high-speed chatter-free milling is achieved, and practicability is good.

Description

technical field [0001] The invention belongs to the field of manufacturing thin-walled parts, in particular to a thin-walled part milling chatter suppressing method. Background technique [0002] Document 1 "Song Q, Liu Z, Wan Y, et al. Application of Sherman-Morrison-Woodbury formulas in instantaneous dynamic of peripheral milling for thin-walled component [J]. International Journal of Mechanical Sciences, 2015, 96-97: 79-90." discloses a milling stability prediction method using the Sherman-Morrison-Woodbury formula to consider the effect of material removal on the dynamic parameters of thin-walled parts during milling. This method discretizes the milling process, and uses the Sherman-Morrison-Woodbury formula to obtain the dynamic parameters of the discretized thin-walled parts during the milling process with the change law of material removal to obtain the corresponding dynamic parameters, and then use the stability to solve the equation to get The relationship between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q11/00
CPCB23Q11/0035
Inventor 万敏党学斌张卫红杨昀马颖超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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