Authors: Zhan Qiang Liu, Xing Ai
446
Authors: Han Ul Lee, Dong Woo Cho
Abstract: For effective rough milling, an optimized criterion is required to select the feedrate. In this
study, a method to obtain the most appropriate reference cutting force for rough milling was
developed. The reference cutting force was determined by considering the transverse rupture strength
of the tool material and the area of the rupture surface. A finite element method analysis was
performed to accurately calculate the area of the rupture surface. Using the analyzed results, the effect
of various cutting parameters on the chipping phenomenon was determined. The calculation method
for the reference cutting force considered the area of the rupture surface, the effect of the rake angle,
and the axial depth of cut. The experimental results clearly show that the reference cutting force
obtained from the proposed method met the desired constraints.
43
Authors: Hai Rong Wu, Guo Qin Huang, Xipeng Xu
Abstract: An experimental study was carried out to investigate the effects of cutting parameters on cutting force and temperature in cutting of hardened W18Cr4V with PCBN cutter. Three components of cutting force were recorded by a strain-gauge dynamometer and the cutting temperature was measured by a nature thermocouple of tool-workpiece. The cutting parameters were arranged by orthogonal method. It is shown that the cutting temperature increased with each of the three cutting parameters and the main effecting factor is feeding speed. The three components of cutting force increased greatly with an increase in feeding speed and cutting depth. But the forces decreased a little as cutting speed increased. The main and axial cutting forces depend mainly on cutting depth whereas the radius force is mainly influenced by feeding speed.
559
Authors: Yi Wan, Zhan Qiang Liu, Xing Ai
Abstract: Five-axis milling is widely used in machining of complex surfaces parts. Part quality and productivity are extremely affected by cutting force and tool wear, especially thin-walled complex surface, such as turbine blade. Although extensive research has been conducted on cutting force and tool wear in 3-milling process, very few are on 5-axis milling and bull-nose mills. This paper presents cutting forces with various cutting conditions as well as tool wear patterns in five-axis milling super alloy, which is essential to cutting vibration and defelction analysis of thin-walled complex surfaces parts. The roles of lead angle and tilt angle in five axis milling were investigated, which provide data for NC program edit. In addition, experiments in this research proved that tool wear played affected cutting forces outstandingly.Therefore, tool wear played an very important role in tool change.
2049
Authors: Rao T. Sadasiva, K. Satyanarayana, Y. Praneeth, Anne Venu Gopal
Abstract: Milling is the most widely applied machining process for producing flat surfaces and prismatic shapes. To minimize the process time and maximize the quality of the workpiece, it is essential to monitor the condition of cutting tool in machining operation and to optimize the process parameters. In the present investigations, experiments were performed on EN31 steel with un-coated carbide inserts in face milling with tools having different approach angles in order to determine the performance of the tool. The effects of process parameters namely speed, depth of cut and feed on tool wear of work piece were investigated. The cutting forces and tool wear are measured in order to evaluate the performance of the cutter. Acoustic emission signal was used for the online tool monitoring. A statistical technique, Taguchi design of experiments was used to optimize the machining process parameters such as speed, feed, depth of cut and approach angle.
3147
