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Tool Path Planning and Orientation Optimization for High Speec Milling of Mold Surface with Toroidal Cutter

Author: LiuMeiYu
Tutor: WangYiQiang
School: Jilin University
Course: Mechanical Manufacturing and Automation
Keywords: High Speed ??Milling Mold surfaces Toroidal cutter Path planning The tool bits posture optimization
CLC: TG54
Type: Master's thesis
Year: 2011
Downloads: 98
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Abstract

CNC high-speed machining set of efficient, high-quality, low-power characteristics, become the mold manufacturing the most advanced manufacturing technology. Speed ??cutting mold technology research focuses on two aspects of the high-speed cutting of different materials mold process test and high-speed cutting machining tool path planning and programming. Mold tool path planning in high-speed cutting tool path, the tool position and orientation, the feed and the feed rate as the main research content, in order to reduce tool wear and extend tool life and improve surface machining accuracy and machining efficiency for the purpose of the tool the optimization of the path. Optimize two ring face milling cutter high speed milling mold surface path planning and tool bits posture, path generation mechanism optimization algorithm and tool position and orientation of some exploration work and results are summarized as follows: analysis and study the CNC machining tool path planning research status at home and abroad, and expounded the traditional parameters such as law, section line method according to the topology and parameters of the path, from the the algorithm simplicity of calculation, efficiency and machining accuracy, and other residues height method and the advantages and disadvantages of C space law. Since the above processing method is to rely on the boundary line of the curved surface to be processed to generate the corresponding initial trajectory line iteration neighboring cutter trajectory is generated by the initial trajectory line, the generation of the new trajectory line has a great dependence on a trajectory line before The resulting error is inevitable, error in the iterative process is cumulative and superimposed serious impact to be processed surface machining accuracy and processing efficiency. In this paper, considering the topology of the tool path and planning strategies, mainly to study two aspects to optimize the initial tool path optimization tool position and orientation. Specific optimization algorithm fully consider the the toroidal cutter and the local geometry to be processed surface, based on the knife contact area on the processing characteristics of the potential field, determine the initial conditions to guarantee the maximum average processing bandwidth and cutting efficiency toolpaths. That local characteristics of the potential field analysis of the the knife contact area surfaces Search the largest average processing bandwidth as the initial tool path, tool path planning method based on the processing of potential field method, its main advantage is greatly reduced relative the neighbor path dependence, effectively avoid error superimposed and enlarged shortcomings of, and give full play to the advantage of the five-axis CNC machining. Simulation results prove that this method relative to the traditional parameters such as line method can effectively improve processing efficiency in the processing of complex surfaces. Processing potential field-based method to generate the tool path of a total of 39, as opposed to the traditional parameters such as line method 4, but the total length of the toolpath generated by the proposed method reduced the parameter line method 3678.57mm 2212.535mm, relative to up 39.85 percent. Torus cutter special milling profile parameters of the high-speed rotation of the tool swept volume and swept profile to describe the tool surfaces and geometric relationships be machined surfaces into line - face by face - face relationship The relationship between depth analysis and discussion. Based on interference and interference type explore, meet without interference conditions tangent formula was introduced, then according to the curvature of the matching principle, by adjusting the size of the the tool heel angle and slip angle, to determine the tool without interference conditions optimal cutting attitude, so that the tool swept profile maximum approximation to be processed surface, thereby obtaining the maximum processing bandwidth. Geometry, computational simulation of the path and the position and orientation of the tool, it is proved that the proposed method based on guarantee the accuracy of surface machining, improve the quality of a of toolpath programming system planning and optimization tool position and orientation, and to improve the processing efficiency.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Milling and milling machine
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