Optimal feed rate control for multi-axis CNC machining of free form surfaces

Abstract In this paper, a methodology of applying convex hull property in solving the tool interference problem is presented for 5-axis NC machining of free-form surfaces. Instead of exhausted point-by-point checking for possible tool interference, a quick checking can be done by using the convex hull constructed from the control polygon of free-form surface modeling. Global tool interference in 5-axis NC machining is detected using the convex hull of the free-form surface. A correction method for removing tool interference has also been developed to generate correct tool path for 5-axis NC machining. The inter-surface tool interference can be avoided by using the developed technique.

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Finding Cutter Engagement for Ball End Milling of Tessellated Free-Form Surfaces

Volume 3: 25th Computers and Information in Engineering Conference, Parts A and B ◽

10.1115/detc2005-84798 ◽

2005 ◽

Cited By ~ 1

Author(s):

Zhiyang Yao

Keyword(s):

Surface Finish ◽

Feed Rate ◽

End Milling ◽

Geometric Algorithms ◽

Free Form ◽

Ball End Milling ◽

Final Surface ◽

End Mills ◽

Free Form Surfaces ◽

Final Surface Finish

In fabricating free-form surfaces, ball end mills are mainly used to reach the final surface finish requirements. In the milling processes, cutter engagement value measures what portion of the cutter is involved in machining at a given instant of time. This paper presents geometric algorithms for estimating cutter engagement values for ball end milling processes of tessellated free-form surfaces. The cutter engagement value calculated here can be used later on in generating efficient cutter paths, as well as performing adaptive feed rate controls.

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Adaptive Tool Path Planning Strategy for 5-Axis CNC Machining of Free Form Surfaces

Volume 2: Processes; Materials ◽

10.1115/msec2019-2737 ◽

2019 ◽

Cited By ~ 1

Author(s):

Hrishikesh Mane ◽

S. S. Pande

Keyword(s):

Tool Path ◽

Cnc Machining ◽

Memory Storage ◽

Free Form ◽

Cnc Machine ◽

Planning Strategy ◽

Part Quality ◽

Tool Paths ◽

Path Topology ◽

Free Form Surfaces

Abstract This paper presents a curvature based adaptive iso-parametric strategy for the efficient machining of free form surfaces on 5-axis CNC machine using the flat end mill tool. One iso-parametric boundary of the surface is selected as the initial tool path. Set of cutter contact (CC) points are chosen adaptively on the initial tool path considering desired profile tolerance. Adjacent iso-parametric tool paths are computed adaptively based on the scallop height constraint unlike the traditional iso-parametric approach. The path topology is post-processed to generate the part program for 5-axis CNC machine in ISO format. The system was rigorously tested for various case studies by comparing the results with the traditional 5-axis iso-parametric tool path strategy, iso-scallop strategy and iso-planar strategy of a commercial software. Our system was found to generate efficient tool paths in terms of part quality, productivity and memory storage compared to the conventional strategies.

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