Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Tool path generation

Surface Roughness Prediction Using Circular Interpolation Based on Artificial Neural Network in Milling Operation

Maan Aabid Tawfiq; Ahmed A.A. Duroobi; Safaa K. Ghazi

Engineering and Technology Journal, 2016, Volume 34, Issue 5, Pages 983-998

This paper presents a method togenerate tool path and get G-codes for complex shapes depending on mathematical equations without using the package programs that use linear interpolation. Circular interpolation (G02, and G03) were used to generate tool path. This needs to define the tool radius and radius of curvature in addition to the cutting direction whether clockwise or counter clockwise. In addition many other factors had been considered in the machining process of the proposed surface to find the best tool path and G-code. Side step, feed rate and cutting speed had been studied as machining factors affecting tool path generation process. Artificial Neural Network technique had also been considered to find the best tool path depending on the cutting parameters proposed while surface roughness was the characteristic that the tool path process and G-code generation depend on. The impact of the machining parameters on the surface roughness was determined by the use of analysis of variance (ANOVA) that detects more influence for side step (85%, 53%, and 67%).From this study, it has been learned that less side step (0.2) mm and feed speed (1000) mm/min and high value for cutting speed (94.2) m/mingive better tool path to be used in machining operations. This study would help engineers and machinists to select the best tool path for their products.

Step over Estimation for Tool Path Generation Depending on Inclination Angle

Ahmed A.A.Duroobi

Engineering and Technology Journal, 2013, Volume 31, Issue 9, Pages 1640-1657

This research presents the theoretical model, simulation and experimental verification of the maximum stepover estimation for different cases on the machine surface profile using the end-filleted cutter in multi-axis machining. Where in this research, the equations that detect the maximum stepover at allowable scallop height value have been taking into consideration and derived to predict the tool path generation for different inclination angles of tool axis. A set of inclination angles of cutter tool axis that can machine the workpiece have been taken into consideration depending on the shape of the workpiece. The inclination angle of the tool axis, effective cutter radius, and the geometrical shape of the workpiece have been studied and experimentally verified for milling operation. The results show that the proposed model for estimating stepover at constant scallop height can predict the tool path generation for machining sculpture surfaces using CNC multi-axis machine.

Automatic Tool Path Generation for Parametric Surfaces in Terms of Bezier Patches

Tahseen Fadhil Abbas

Engineering and Technology Journal, 2009, Volume 27, Issue 4, Pages 641-653

The objective aim of this paper is to develop an algorithm that generate NC tool
path for parametric surfaces based on the accuracy of a desired surface. A designed
surface is represented by sufficient control points , using these control points , the
surface has been represented depending on Bezier technique to generate reliable and
near-optimal tool path as well as cutter location data file for post-processing; the
proposed algorithm include two functions:
· Forward step function that determine the maximum distance between cutter
contact points (CC) with the given surface tolerance.
· Side step function which determine the maximum distance between two
adjacent tool paths with a given scallop height.
The output of these two functions are engaged with the generated interior data of the
desired surface and feed automatically to a vertical CNC machine (Bridge Port) through
the serial port (RS232), then one tool paths has been implemented for manufacturing one
parametric surface, with tolerance of 0.5mm, using vertical CNC milling machines
(Bridge Port) with ball nose end mill cutter ø 14mm.
The proposed algorithm has been implemented for tool path generation of several
parametric surfaces to illustrate its flexibility,