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Analytical calculation method for ball-end milling cutter and workpiece contact area

A contact area, ball end milling cutter technology, applied in design optimization/simulation, special data processing applications, geometric CAD, etc., can solve the problems of low calculation efficiency and large amount of calculation, and achieve accurate calculation results and improve calculation efficiency. Effect

Pending Publication Date: 2021-02-09
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes an analytical calculation method for the contact area between the ball end milling cutter and the workpiece to solve the problems of large amount of calculation and low calculation efficiency in the existing method for obtaining the contact area of ​​free-form surface

Method used

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  • Analytical calculation method for ball-end milling cutter and workpiece contact area
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  • Analytical calculation method for ball-end milling cutter and workpiece contact area

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Embodiment 1

[0045] Embodiment 1: as Figure 1-Figure 8 An analytical calculation method for the contact area between the ball end milling cutter and the workpiece is shown. This method avoids a large number of calculations in the process of updating the swept body of the tool and the processed workpiece each time, and improves the calculation efficiency. At the same time, compared with the traditional analytical method Considering the influence of the curvature of the free-form surface, the calculation accuracy is improved. The invention is applicable to the judgment of instantaneous contact area in the process of machining free-form surface by ball end milling cutter, and can be used for prediction of cutting force in the process of free-form surface milling. Its specific implementation steps are as follows:

[0046] Step 1: According to the initial leaf apex and leaf root point data, the model of the blade is obtained by B-spline method interpolation fitting, and the processing tool is...

Embodiment 2

[0063] Embodiment 2: An analytical calculation method for the contact area between the ball end milling cutter and the workpiece. The blade generated in the CMA software is the finishing target based on the initial blade apex and blade root point data, and the 30th row of tool paths is selected, and the 50th row Calculation of the instantaneous contact area between the ball end milling cutter and the workpiece at each tool position. Analytical calculation methods such as figure 1 shown, including the following steps:

[0064] 1. The object of processing in this embodiment is the blade obtained by CAM software. The cutting tool is a ball end milling cutter with a cutting radius R=3mm.

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Abstract

The invention relates to the technical field of machine manufacturing, in particular to an analytical calculation method for a ball-end milling cutter and a workpiece contact area which comprises thefollowing steps: obtaining a model of a blade by interpolation fitting through a B spline method, and obtaining a cutting position and a geometrical parameter file; according to the condition of chipformation, considering the curvature of the free-form surface, and obtaining geometric condition limitation of a parametric cutting area; and searching the ordinate z1 meeting the geometric constraintin the interval [0, R] as the lower limit of the contact area, searching the upper limit of the contact area through a dichotomy, and finally determining the contact area [z1, z2]. According to the analytic calculation method for the contact area of the ball-end milling cutter and the workpiece, the problems that an existing method for obtaining the contact area of the free-form surface is largein calculation amount and low in calculation efficiency are solved.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to an analytical calculation method for the contact area between a ball end milling cutter and a workpiece. Background technique [0002] Free-form thin-walled parts are widely used in aerospace, automobile, mold and other industries. Thin-walled parts have the characteristics of thin wall, low rigidity and large curvature, and are prone to problems such as chatter and processing deformation during processing. These problems are closely related to the cutting force, and the accurate acquisition of the tool-workpiece contact area is the key to accurately predict the cutting force in the process of free-form surface machining. At present, analytical method, Z-map method and solid method are mainly used to obtain the contact area of ​​free-form surface. Using the solid method and Z-map method, the swept body of the tool and the processed workpiece need to be updated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/20
CPCG06F30/20G06F30/17
Inventor 王海同杨宇伟蔡永林鞠楠
Owner BEIJING JIAOTONG UNIV