Materials Science Forum Vols. 800-801

Abstract: Tool compensation determines the machining precision and quality . There are tool length compensation,tool radius compensation and corner radius compensation in CNC system .The parameters of these compensation are all static.The purpose of this study was that the machining precision and quality were improved by changing the parameters of tool compensation,based upon changing the static parameters into the dynamic parameters of tool compensation.The three tool compensations were introduced and discussed about these being used in machining process and the function in processing.The concept of dynamic tool compensation was proposed in this paper. The method was used that the dynamic parameter substituted the static parameter in the processing by calculating . The process machining crafts information was included in tool compensation in every process step. The computer program was finished about how to calculate the dynamic parameter. The results indicate that high-precision machining is within the range of the maximum probability and the large machining error is within the range of the minimum probability by useing this method. Further more, the end qualified product is more than before.Process indicators and tool compensation merged is a breakthrough research by probability calculating for impoving the machining precision.We confirmed that the proposed method could be l used widely.

Abstract: Ultra-high strength steel 30Cr3SiNiMoVA is a typical difficult-to-cut material. During the machining process of 30Cr3SiNiMoVA, tool wear is an important factor which needs to be investigated seriously. In this work, one kind of CVD coated tools was used to investigate the tool wear mechanism of face milling of Ultra-high Strength Steel 30Cr3SiNiMoVA. Cutting forces during the wear process were measured with a kistler dyna-mometer. Surface roughness and tool wear evolution were determined.

Abstract: Titanium alloy is difficult cutting materials,the samples of toolwear features are hard to acquire because of short tool life. In terms of the characteristic, Support Vector Machine (SVM) is proposed in this paper to monitor tool condition, the energy ratio of six different frequency bands of acoustic emission (AE) signal are extracted as cutting tool state features , SVM is trained and tested using these features ,Good classification results were achieved by using test set.

Abstract: This paper focusing on cutting performance high speed milling Electrical Discharging Machining (EDM) graphite with diamond coated、Carbide (WC) and TiAlN coated cutting Tools. tools wear, cutting force and machined surface had been researched. Experiment study including cutting speed, feed rate per tooth, radial depth of cut, axial depth of cut, and material of tools factors effects on the cutting forces. Cutting parameters are optimized based on the orthogonal experiment. Experiment in high speed milling with diamond coated tools all comparison with TiAlN coated and Carbide (WC) tools. On the surface quality, cutting forces and tool wear influence graphite cutting tool materials research, process parameters, tool design and optimization of processing parameters to provide supportive data. The minimum cutting force as the goal, through the orthogonal experiment for the optimization of cutting parameters obtained for the high speed milling graphite with diamond-coated tool: cutting force 360m/min,feed per tooth 0.15mm/z, radial depth of cut 0.9mm, axial depth of 9mm.

Abstract: Through machining superalloy GH4169 in center lathe by four kinds material of tool, which are YT763, K313, KC5510 and SM1105, analyzing the changings of cutting force and surface roughness in different material of tool and the forms of tool wear. As the experiment data shows, there is little influence of the different tool in material with the same coating to cutting force and surface roughness. KC5510 is more suitable for constant speed cutting GH4169, which offers the choices of tool material when machining superalloy in common speed.

Abstract: Complex cavity generally is machined in 3 axis or 3+2 axis machine tools, it has large amount of metal to be removed. For complex cavity machining, the cutting speed of ball end mill`s head point is zero, which makes its end milling ability poor; Torus cutter `s flat bottom width is wide, which causes curvature interference and concave-uncut. So this article designs a new kind of cutter for complex cavity roughing and semi-finishing, which can improve ball end mill`s poor end milling ability and decrease flat-end width. The simulation results show that the new cutter`s feasibility of machining complex cavity is better, and it can obviously reduce the amount of owe cutting compared with the torus cutter; At the same time, the new cutter can improve machining efficiency by 32.4% compared with the ball end mill, and good surface can also be generated.

Abstract: Today’s cutting tool, characterized by specialization trend, require flexibility, adaptive and integrating of the cutting tool design. Targeting those goals, this paper presents a new approach, cutting tool “shape-performance-application” integrating design (CTSPAID), which considers the tool shape, performance and applications together, and builds the relationships between them, and achieve the combines between cutting tools and their applications. Also, the system architecture with three layers and two steps is put forward and IDEF0 are selected as the modelling method, as well as some rulers for this system.

Abstract: The high-speed milling experiments on hardened Cr12MoV steel were carried out with ball end milling cutter of different edge parameters. The influences of helix angle and rake angle on tool life and surface roughness were focused on. Meanwhile, the impacts of edge parameters on cutting edge stiffness and flank wear were analyzed on the condition of high-speed milling. It carried out that smaller helix angle and negative rake angle selected during high speed milling can guarantee quality of surface manufactured as well as longer tool life.

Abstract: This paper aim at frequent alternating load, caused by milling large covering parts with hardened steel give rise to cutting chatter, increase surface size error in mould processing. Based on theory of helix spiral surface, design circular milling cutter with damping groove, and employ simulation of finite element to verify the efficient performance of chip breaker. Effectively reduce milling vibration problem caused by the mutation of cutting force, cutting temperature, provide theoretical model to the subsequent tool structure parameters and manufacture technology research.

Abstract: Ball-end milling cutter is widely used in machining complex surface parts , and it is need to select a reasonable geometric parameters of the milling cutter for different work piece materials and shapes and cutting parameters. This article is based on UG secondary development technology to develop the Multi-blade ball-end milling cutter parametric design system, it is automatic, fast and efficient to build all kinds of parameters of double, three and four blades ball-end milling cutter model required for user.