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It frequently generates vibration in machining, which interferences and disruptions normal cutting process, worsens the machining accuracy and the surface quality and lessens productiveness. The generation of vibration is related to the dynamic characteristics of process systems consisting of machine tools, fixtures, tool and workpiece. It detailed analyzes the main vibration types in turning processing,...
This paper describes the development of model based fuzzy logic for selecting cutting condition in turning operations. And it is based on the assumption that the relationship between the hardness, cutting speed and feed rates an imprecise one and can be described and evaluated by the fuzzy set theory. The model to be applied to Tool and Die steel material with three types of cutting tool materials...
On the basis of three-dimensional finite element modeling method, a cutting model is built in accordant with the real working environment. In the simulation, some results including the temperature distribution, cutting force variable and stress field were obtained. The simulation result can help to improve and optimize the parameters of the real turning process, to reduce costly and time consuming...
Machining parameters optimization is very crucial in any machining process. This research focuses on Multi-objective Evolutionary Algorithm based optimization technique, to determine optimal cutting parameters (cutting speed, feed, and depth of cut) in turning operation. Two conflicting objectives (operation time and tool life) with three constraints, which depends on the turning parameters, are optimized...
This paper proposes a design methodology and presents the results of applying the methodology in the design of a novel lathe-mill reconfigurable machine tool. Considerable research has been conducted in reconfigurable machines yet most of the work has been for mills and not for lathe-mills. The significant increase in efficiency and the reduced investment required for a reconfigurable manufacturing...
In order to improve the current precision of machining, a hydraulic micro-feed actuator for precision turning used in lathe or conventional CNC turning centers is introduced and the design formulas of important structure are given. The characteristics of the actuator such as displacement, natural frequency, cutting are researched by using the finite element analysis and experimental methods. The results...
MQL(minimal quantity lubrication) machining produces almost similar cutting performance to conventional flood supply machining while using much less metal working fluid. To take full advantage of MQL machining and expand its applicability, an understanding of its flow field behavior is critical. Hence, in this study, it is analyzed that the influence of airflow movement surrounding workpiece on cutting...
The metallurgical observation and measurement analysis of the chip morphology and cutting force in high-speed turning of AISI-1045 hardened steel were performed. The influences of workpiece material hardness, cutting condition, serrated chip morphology and adiabatic shear instability on cutting force were analysed. The investigations indicate that two types of serrated chips with deformed adiabatic...
In this paper, a transient dynamic finite-element analysis was carried out to investigate the effects of tool rake angle on cutting temperature, cutting force and chip-shear angle. The workpiece material is SiCp/Al composites, which are widely used in automotive industry, aircraft and aerospace constructions. The results show that cutting temperature and cutting force decrease, while the chip-shear...
The purpose of this research was to study factors affecting the tool ware in cold work steels (DC53) turning using cutting tools with Physical Vapor Deposition (PVD) process. Factors studied set at three levels were consisted of cutting speeds, feed rates, and depth of cuts applying factorial design. Results revealed that interaction factor of cutting speeds, feed rates and depth of cuts was affected...
On-line tool wear estimation in turning is essential for on-line cutting process optimization. In this work, cutting force measurement is used for a reliable on-line flank wear estimation and tool life monitoring. Models for flank wear will be obtained as a function of machining parameters and dynamic cutting forces. The coefficients for flank wear models are obtained by using the experimental results...
The prediction and control of cutting process was a complicated problem and the suitable cutting parameters are instrumental to cutting process, the prediction models for cutting parameters realized with artificial neural networks was proposed in this paper. Artificial neural networks have strong non-linear modeling ability which can express the nonlinear mapping relation of input and output, but...
Optimization of cutting parameters is very important issues in manufacturing engineering. For slender bar turning operations, drum-shaped error is one of the most important product quality characteristics. In this work, an artificial neural network model was developed firstly to describe the relationship between cutting parameters and drum-shaped error in slender bar turning process. Based on the...
It is a critical step to control the cutting vibration during diamond turning in order to obtain super smooth surface. Both the wavelet transformation method and the autoregressive moving average (ARMA) model are combined utilized to predict and fit the cutting vibration signals in diamond turning. Firstly, by means of the wavelet transform, the cutting vibration series have been decomposed at multi-levels...
In this paper, a new fast tool servocontrol method for noncircular turning process (NCTP) is presented. Based on the tracking and disturbance rejection requirements for NCTP, the controller is designed through a combined active disturbance rejection control and feedforward arrangement by exploiting the unique disturbance estimation and compensation concept and the known reference acceleration signals...
The performance of Multivariable Step-Wise Safe Switching Iterative Feedback Tuning is studied for a constant turning force system under varying cutting conditions. The tuning technique does not use a plantpsilas model, neither nonlinear or approximate linearized, and is based on specific experiments performed on the closed-loop plant. Controller parameter tuning aims to achieve minimization of a...
Recently, there have been several interesting researches on the microfactory especially in Japan, U.S., and Korea. Since the microfactory possess the advantage of flexible manufacturing system and/or reconfigurable manufacturing system, we introduced the concept of modular reconfigurable machine structure in our micro machine tool design for microfactory. Modular reconfigurable machine tools can easily...
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