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Tool selection and collision-free in 5-axis numerical control machining of free-form surfaces

Journal of Chongqing University 2002年第2期1卷 20-23页

作者：杨长祺 QIN Datong 等 StateKeyLaboratoryofMechanicalTransmission ChongqingUniversityChongqing400044P.R.China

The methodology of 5-axis cutter selection to avert collision for free-form surface machining by flat-end cutters is presented. The combination of different cutters is adopt aiming at short machining time and high precision. The optimal small cutter is determined based on the geometric information of the points where a cutter most probably collide with the machined surface. Several larger cutters are selected to machine the surface in order to find the interference-free area. The difference of machining time for this area between the optimal small cutter and the large cutters is calculated. The functional relationship between the machining time and the radius of a cutter is established, by which the optimal number of cutters is obtained. The combination of cutters, which possesses the minimum overall machining time, is selected as the optimal cutter sizes. A case study has demonstrated the validity of the proposed methodology and algorithms.

关键词： optimal tool selection collision-free tool path generation free-form surfaces flat-end cutter

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Research on the Fault Monitoring System in free-form Surface CNC Machining Based on Wavelet Analysis

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厦门大学学报（自然科学版） 2002年第S1期41卷 72-73页

作者： XU Shu-xin 1, ZHAO Ji 2, ZHAN Jian-ming 1, LE Guan 1 (1. College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China 2. Office of Education Administration, Jilin University, Changchun 130012, Chi na)

Carrying out experiments and researches on tool bre ak age and undercut of work-piece of free-form surface by using wavelet analysis, both the fault features can be extracted in a special frequency segment of wave let decompose. According to the feature of transient fault, the author proposes for the first time the automatic determination technology of the threshold by us e of the adaptive filter characteristic of wavelet transform. Based on profound researches on steady fault feature, this dissertation makes an effective token o f steady fault feature by using wavelet energy method, and proposes the new idea to identify cut-in case and cut-out case, thereby successfully gives an uniqu e description quantitatively on the characterization of the variation of fault a nd cutting condition in the monitoring system.

关键词： wavelet analysis free-form surfaces CNC mach ining monitoring system

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