A Method for Predicting Chatter in NC Milling of Mold Cavities

A CNC milling and cavity technology, applied in milling machine equipment, manufacturing tools, milling machine equipment details, etc., can solve the problems of low accuracy of milling chatter prediction, affect the quality of mold cavity processing, and speed up tool failure, etc., to achieve the prediction process Convenience and quickness, accurate chatter prediction, and guaranteed processing quality

Inactive Publication Date: 2020-02-14
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing single tool path milling stability prediction method has low applicability, which leads to low milling chatter prediction accuracy, accelerates tool failure, and affects the processing quality of the mold cavity, and proposes a prediction Method of Chatter in NC Milling of Mold Cavity

Method used

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  • A Method for Predicting Chatter in NC Milling of Mold Cavities
  • A Method for Predicting Chatter in NC Milling of Mold Cavities
  • A Method for Predicting Chatter in NC Milling of Mold Cavities

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specific Embodiment approach 1

[0031] Specific implementation manner 1: The specific process of a method for predicting chatter vibration in CNC milling of a mold cavity in this implementation manner is as follows:

[0032] Step 1. Establish the relative transfer function of the tool-workpiece system;

[0033] Obtaining the dynamic characteristics of the tool-workpiece system, that is, the transfer function matrix, is an important prerequisite for the stability prediction of the milling process. Most of the previous studies only considered the dynamic characteristics of the tool system, and ignored the influence of the workpiece system on the dynamic characteristics of the overall machining system. The present invention comprehensively considers the dynamic characteristics of the tool subsystem and the workpiece subsystem, based on the relative transfer function. The overall dynamic model of the tool-workpiece system.

[0034] Obtain the transfer function of the tool subsystem and the workpiece subsystem respecti...

specific Embodiment approach 2

[0042] Second embodiment: This embodiment is different from the first embodiment in that in the second step, the relative transfer function of the tool-workpiece system obtained in step one is introduced into the three-dimensional milling stability model to obtain the milling chatter frequency of the milling cutter The critical axial cutting depth at, the specific process is:

[0043] The three-dimensional milling stability model based on the frequency domain method. When the milling cutter mills the side surface of the mold groove, the tangential force F t Distributed along the milling speed direction of the milling edge of the milling cutter, radial force F r Is the radial direction of milling cutter feed, axial force F a Acts in the axial direction of the milling cutter; in order to consider the general situation, in the milling edge line, the milling edge is divided into a limited number of small differential units. The chip loads and the corresponding differential loads in th...

specific Embodiment approach 3

[0100] Specific embodiment three: This embodiment is different from specific embodiment one or two in that when the tool is down milling, the horizontal cut-in angle and cut-out angle of the cutter tooth are respectively with The formula is:

[0101]

[0102] Where R c Is the tool radius, a e Is the radial depth of cut;

[0103] When the tool is up-milling, the horizontal cut-in angle and cut-out angle of the tooth are respectively with The formula is:

[0104]

[0105] Other steps and parameters are the same as those in the first or second embodiment.

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Abstract

The invention relates to a method for prediction of flutter in numerical-control milling of mold cavities, aiming to solve problems that conventional methods for predicting stability in milling utilizing single tool path are low in applicability, which causes low accuracy of flutter prediction, accelerates failure of tools and affects processing quality of mold cavities. The method for predictionof flutter in numerical-control milling of mold cavities includes the step 1, building the relative transfer function of a tool-workpiece system; the step 2, introducing the relative transfer function of the tool-workpiece system to a three-dimensional milling stability model to obtain a critical axial cutting depth at the milling flutter frequency of a milling cutter; the step 3, judging whetherthe mold cavities flutter in numerical-control milling according to the critical axial cutting depth obtained in the step 2. The method is applied to the field of numerical-control milling of the mold cavities.

Description

Technical field [0001] The invention relates to a method for predicting chatter vibration in numerical control milling of a mold cavity. Background technique [0002] Complex cavity molds are widely used in industries such as automobiles, aerospace, shipbuilding, and home appliances, and generally require high machining accuracy and surface quality. Usually, the shape features in the mold cavity are changeable, with irregular sharp corners, rounded corners or obtuse angles and other large and small transitional connections and complex variable curvature cavity structures. Computer numerical control (CNC) milling processing technology is for this type of workpiece. One of the important processing methods. At present, computer numerical control (CNC) milling processing technology has been well developed. It has the advantages of high metal removal rate, good surface quality and high efficiency, but for new products or component processing systems, long-term trials are still needed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23C9/00
CPCB23C9/00
Inventor 姜彦翠仇焱刘献礼崔健
Owner HARBIN UNIV OF SCI & TECH
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