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Milling chatter prediction method for thin bottom plate

A technology of milling chatter and prediction method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of reduced accuracy in the stability domain, no consideration of the influence of dynamic cutting forces, and unfavorable machining process stability parameters selection and other problems, to achieve the effect of improving the accuracy of stability prediction

Active Publication Date: 2021-08-31
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] All the above literatures have carried out the prediction of chatter in the milling process; but in the actual application process, the methods disclosed in literature 1 and literature 2 do not consider the static deformation of the tool The influence on the dynamic cutting force in the milling process of thin base plate reduces the accuracy of the predicted stable domain, which is not conducive to the selection of stability parameters in the machining process

Method used

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  • Milling chatter prediction method for thin bottom plate
  • Milling chatter prediction method for thin bottom plate
  • Milling chatter prediction method for thin bottom plate

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Example 1: The size of the cutting part of the cavity is 172mm×70mm×3mm, the material is aluminum alloy 7075, the modulus of elasticity is 71.0GPa, and the density is 2830kg / m 3 , Poisson's ratio is 0.3.

[0046] 1. The dynamic state equation of the workpiece during milling is:

[0047]

[0048] m W ,C W ,KW Represents the mass, damping, and stiffness matrices of the initial workpiece; and Q W (t) represents the acceleration, velocity and displacement vector of the workpiece under physical coordinates; F W (t) represents the dynamic cutting force acting on the workpiece.

[0049] 2. During the milling process of thin base plate, the dynamic cutting force acting on the workpiece at time t:

[0050]

[0051] K tra Represents the cutting force coefficient matrix, K tra =[875,350,296] T ; g(φ j (t,a p )) represents the cutting state function, its value is 1 when the tooth participates in cutting, and the value is 0 when it does not participate in cutting; ...

Embodiment 2

[0073] Example 2: The size of the processed part of the cavity is 180mm×65mm×3.5mm; the material is aluminum alloy 7050, the modulus of elasticity is 71.7GPa, and the density is 2830kg / m 3 , Poisson's ratio is 0.3.

[0074] 1. The dynamic state equation of the workpiece during milling is:

[0075]

[0076] m W ,C W ,K W Represents the mass, damping, and stiffness matrices of the initial workpiece; and Q W (t) represents the acceleration, velocity and displacement vector of the workpiece under physical coordinates; F W (t) represents the dynamic cutting force acting on the workpiece.

[0077] 2. During the milling process of thin base plate, the dynamic cutting force acting on the workpiece at time t:

[0078]

[0079] K tra Represents the cutting force coefficient matrix, K tra =[896,371,311] T ; g(φ j (t,a p )) represents the cutting state function, its value is 1 when the tooth participates in cutting, and the value is 0 when it does not participate in cut...

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Abstract

The invention relates to a thin bottom plate milling chatter prediction method which is suitable for predicting a stability domain of a thin bottom plate component in a milling process. According to the method, stability analysis of the thin bottom plate milling process is carried out by establishing a dynamic cutting force model of the thin bottom plate milling process considering cutter deformation, a stability lobe graph of the thin bottom plate milling process is obtained, a parameter selection range is widened for stable milling of the thin bottom plate, and the function of predicting the flutter stability of the whole thin bottom plate milling process is achieved. The method can improve the prediction precision.

Description

technical field [0001] The invention relates to a chatter prediction during the milling process of a thin base plate member, in particular to a stability prediction by establishing a dynamic cutting force model considering the influence of the static deformation of the tool on the dynamic chip thickness in the thin base plate milling process, and is mainly suitable for thin base plate member milling Prediction of Stable Domains in Machining Processes. Background technique [0002] Document 1 "Y.Q.Yang, Q.Liu, B.Zhang, Three-dimensional chatter stability prediction of milling based on the linear and exponential cutting force model, International Journal of Advanced Manufacturing Technology 72(2014) 1175–1185." discloses a prediction A method for stability in milling of thin baseplates. The method comprehensively considers the flexibility of the tool and the workpiece, expresses the dynamic cutting force in the milling process linearly, and solves the state equation of the th...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/20G06F119/02G06F119/14
CPCG06F30/17G06F30/20G06F2119/02G06F2119/14
Inventor 万敏党学斌张卫红杨昀麻继昌孟伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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