scholarly journals An Analysis and Modeling of the Dynamic Stability of the Cutting Process Against Self-Excited Vibration

2019 ◽  
Vol 23 (1) ◽  
pp. 28-35
Author(s):  
A. Motallebia ◽  
A. Doniavi ◽  
Y. Sahebi
Keyword(s):  
Machine Tool ◽  
Removal Rate ◽  
Dimensional Accuracy ◽  
Modal Testing ◽  
Cutting Process ◽  
Work Piece ◽  
Stability Diagrams ◽  
Machine Tool Structure ◽  
Excited Vibration ◽  
The Stability

Abstract Chatter is a self-excited vibration that depends on several parameters such as the dynamic characteristics of a machine tool structure, the material of work piece, the material removal rate, and the geometry of tools. Chatter has an undesirable effect on dimensional accuracy, smoothness of work piece surface, lifetime of tools and machine tools. Thus, it is useful to understand this phenomenon in order to improve the economic aspect of machining. In the present article, firstly, the theoretical study and mathematical modeling of chatter in the cutting process were carried out. Then, by performing modal testing on a milling machine and drawing chatter stability diagrams, we determined the stability regions of the machine tool operation and recognized the parameter that had the most important effect on chatter.

An Analysis and Modeling of the Dynamic Stability of the Cutting Process Against Self-Excited Vibration

2020 ◽  
Vol 22 (4) ◽  
pp. 1287-1300
Author(s):  
A. Motallebia ◽  
A. Doniavi ◽  
Y. Sahebi
Keyword(s):  
Machine Tool ◽  
Removal Rate ◽  
Dimensional Accuracy ◽  
Modal Testing ◽  
Cutting Process ◽  
Work Piece ◽  
Stability Diagrams ◽  
Machine Tool Structure ◽  
Excited Vibration ◽  
The Stability

AbstractChatter is a self-excited vibration which depends on several parameters such as the dynamic characteristics of the machine tool structure, the material of the work piece, the material removal rate, and the geometry of tools. Chatter has an undesirable effect on dimensional accuracy, smoothness of the work piece surface, and the lifetime of tools and the machine tool. Thus, it is useful to understand this phenomenon in order to improve the economic aspect of machining. In the present article, first the theoretical study and mathematical modeling of chatter in the cutting process were carried out, and then by performing modal testing on a milling machine and drawing chatter stability diagrams, we determined the stability regions of the machine tool operation and recognized that witch parameter has a most important effect on chatter.

Experimental and Analytical Investigation of Self-Excited Chatter Vibrations in Metal Cutting

1978 ◽  
Vol 100 (1) ◽  
pp. 92-99
Author(s):  
N. Saravanja-Fabris ◽  
A. F. D’Souza
Keyword(s):  
Metal Cutting ◽  
Orthogonal Cutting ◽  
Analytical Investigation ◽  
Point Of View ◽  
Cutting Process ◽  
Describing Function ◽  
Describing Functions ◽  
Machine Tool Structure ◽  
Excited Vibration ◽  
The Stability

Chatter in metal cutting is a nonlinear self-excited vibration of the limit cycle type. This investigation is concerned with the analysis of chatter from the viewpoint of the describing function. Vibrations with different frequencies and amplitudes were superimposed on the steady feed motion of the tool in orthogonal cutting in order to simulate chatter. The relationships between the oscillating cutting and thrust forces and tool vibrations are discussed from the point of view of energy transfer and describing functions. Experimentally obtained describing functions of the dynamically varying cutting process are given. The stability of a typical machine tool structure under primary chatter conditions with dynamical cutting process represented by its describing function is discussed.

Stability and Online Monitoring of Cutting Chatter: A Review

2011 ◽  
Vol 121-126 ◽  
pp. 377-381
Author(s):  
Yong Liang Zhang ◽  
Zhi Yuan Li
Keyword(s):  
Machine Tool ◽  
Manufacturing Industry ◽  
Online Monitoring ◽  
Rapid Development ◽  
Stability Limit ◽  
Cutting Process ◽  
Work Piece ◽  
Cutting Chatter ◽  
The Stability ◽  
Tool Cutting

Cutting chatter is a kind of severe vibration generating from the interaction of machine tool system and cutting process and it will seriously affect the performance of machine tool and the quality of work piece. With the rapid development towards high precision and automation of the modern manufacturing industry, the stability and monitoring of cutting process have become the hot issues in production and engineering field, lots of useful researches and explorations have been done worldwide. The research situations of stability limit prediction of machine tool cutting system and technology of chatter online monitoring are discussed, the problems and the developing trends are summarized.

Design of a Force Feedback Chatter Control System

1972 ◽  
Vol 94 (1) ◽  
pp. 5-10 ◽  
Author(s):  
C. Nachtigal
Keyword(s):  
Machine Tool ◽  
Frequency Domain ◽  
Transient Response ◽  
Force Feedback ◽  
Design Procedure ◽  
Experimental Tests ◽  
Work Piece ◽  
Regenerative Chatter ◽  
Chatter Control ◽  
The Stability

The analysis of machine tool chatter from frequency domain considerations is generally accepted as a valid representation of the regenerative chatter phenomenon. However, active control of regenerative chatter is still in its embryonic stage. It was established in reference [2] that a measurement of the cutting force could be effectively used in conjunction with a controller and a tool position servo system to increase the stability of an engine lathe and to improve its transient response. This paper presents the design basis for such a system, including both analytical and experimental considerations. The design procedure stems from a real part stability criterion based on the work by Merritt [1]. Because of the unknown variability in the dynamics of a machine tool system, the controller parameters were chosen to accomodate some mismatch between structure and tool servo dynamics. Experimental tests to determine the stability zone of the controlled machine tool system qualitatively confirmed the analytical design results. The experimental results were consistent in that the transient response tests confirmed the frequency domain stability tests. It was also demonstrated experimentally that the equivalent static stiffness of a flexible work-piece system could be substantially increased.

Modal Testing for Heavy Machine Tool Using Active Excitation

2014 ◽  
Vol 536-537 ◽  
pp. 1326-1332 ◽  
Author(s):  
Bo Luo ◽  
Bin Li ◽  
Xin Yong Mao ◽  
Hui Cai
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Inertial Force ◽  
Modal Testing ◽  
Modal Parameters ◽  
Part Quality ◽  
Machine Tool Structure ◽  
Machining Speed ◽  
Heavy Machine ◽  
Large Machine

For application in large machine tools, the machined part quality, accuracy as well as machining speed depende greatly on the dynamics of the structure. In this paper, an active-excitation modal analysis (AEMA), using inertial force of the moving slider to excite the structural modes, is proposed. Modal parameters of the machine tool structure estimated by AEMA are experimentally validated. Since the artificial excitation produced by elaborate excitation equipment is replaced by the inertial force of the slider, the proposed method is much more practical and economical than traditional methods.

Parametric Optimization of EN-31 Steel in Wire Cut Electro Discharge Machining by Taguchi Technique

2020 ◽  
Vol 12 (7) ◽  
pp. 881-887
Author(s):  
Sahil Sharma ◽  
Umesh Kumar Vates ◽  
Amit Bansal
Keyword(s):  
Material Removal Rate ◽  
Automobile Industry ◽  
Material Removal ◽  
Removal Rate ◽  
Dimensional Accuracy ◽  
Work Piece ◽  
Electro Discharge Machining ◽  
En 31 ◽  
The Impact ◽  
Dies And Moulds

Amongst the various methods of machining, Electro Discharge Machining is the convenient alternatives for the industries due to non-contact of work piece and tool. In the study of various EDM processes the main target is to achieve the better finish of surface, high material removal rate and good dimensional accuracy by regulating the different input parameters. There are various applications of EDM such as aerospace parts, medical equipments, dies and moulds, nuclear and automobile industry. In this experimental study, a trial has made to look the impact of input factors like pulse-on, pulse-off, peak current, tension of wire on rate of material removal, gap current and time for machining. Taguchi (L9 OA) and Analysis of Variance technique were used to optimize the outcomes for wire cut EDM of EN-31 tool steel. The outcomes revealed that Ton and Toff are the leading cogent factor for material removal rate and gap current respectively.

Vibration Control in Turning Machining

2013 ◽  
Vol 706-708 ◽  
pp. 1672-1675 ◽  
Author(s):  
Long Bo Chen ◽  
Ji Lin Guo ◽  
Tian Rui Zhou ◽  
Tao Jiang
Keyword(s):  
Free Vibration ◽  
Machine Tool ◽  
Vibration Control ◽  
Detailed Analysis ◽  
Forced Vibration ◽  
Cutting Tool ◽  
System Dynamic ◽  
Cutting Process ◽  
Excited Vibration ◽  
Process System

Vibration in turning processing is associated with free vibration, forced vibration and self-excited vibration, the composition and machine tool, tool and workpiece process system dynamic characteristic.A detailed analysis of the main types of vibration in turning and the causes, and put forward from the aspects of cutting tool, fixture, cutting process, reduce or eliminate vibration measures.

scholarly journals Design of Regenerative Flutter Stability Detection System in Machine Tool Cutting

2021 ◽  
Vol 2074 (1) ◽  
pp. 012071
Author(s):  
Liyao Li
Keyword(s):  
Machine Tool ◽  
Manufacturing Industry ◽  
Cutting Tool ◽  
Detection System ◽  
Machining Process ◽  
Advanced Technology ◽  
Practical Significance ◽  
Work Piece ◽  
Excited Vibration ◽  
Cutting Chatter

Abstract Cutting chatter is a strong relative vibration between cutting tool and work piece in machining process, which will reduce cutting quality and cutting efficiency, and shorten the service life of cutting tool and machine tool. As long as cutting is carried out in production, vibration will occur, and chatter is a strong self-excited vibration between machining work piece and cutting tool. Flutter problem will occur in almost all cutting processes, which will cause a series of problems such as the reduction of dimensional accuracy of machined work pieces, tool damage and so on. In the dynamic design and dynamic analysis of machine tool structure, in order to evaluate and improve the ability of machine tool to resist chatter, and to select the cutting conditions without chatter, it is necessary to judge the cutting stability of machine tool. How to improve the advanced technology of manufacturing industry is an important topic for manufacturing researchers, and the research on the detection of cutting chatter stability has important practical significance for promoting the development of cutting manufacturing industry to high-end technology.

scholarly journals Investigation of the negative influence of cooling lubricants on the deformation of the machine tool structure

2019 ◽  
Vol 95 ◽  
pp. 04006
Author(s):  
Christian Brecher ◽  
Filippos Tzanetos ◽  
Daniel Zontar
Keyword(s):  
Machine Tool ◽  
Thermal State ◽  
Negative Impact ◽  
Negative Influence ◽  
Work Piece ◽  
Ongoing Research ◽  
Thermally Induced ◽  
Machine Tool Structure ◽  
Tool Centre Point ◽  
The Impact

Cooling lubricants have a significant influence on the thermal state of a machine tool. The fluid absorbs the thermal energy of the cutting process and dissipates it to prevent wear of the tool and distortion of the work piece. However, the unpredictable flow of the cooling lubricant also transfers the energy to the machine tool structure and can thus have a negative impact on the produced work piece quality. While the thermal behaviour of machine tools under the influence of thermal environmental conditions is already the subject of ongoing research projects, the influence of cooling lubricants on the thermal state of the machine tool and thus the achievable manufacturing accuracy is still largely unexplored. This paper investigates the thermally induced deformations of the machine tool structure, as well as the impact on the Tool Centre Point (TCP).

Response Prediction of Static Modal Testing on Milling Machine Tool

2014 ◽  
Vol 606 ◽  
pp. 131-135 ◽  
Author(s):  
Norlida Jamil ◽  
Ahmad Razlan Yusoff ◽  
Muhammad Hatifi Mansor
Keyword(s):  
Machine Tool ◽  
3D Model ◽  
Natural Frequencies ◽  
Mechanical Test ◽  
Response Prediction ◽  
Modal Testing ◽  
The Finite Element Method ◽  
Excited Vibration ◽  
Good Consistency ◽  
Design Software

Milling is one of the most common manufacturing processes for automotive component, but its productivity is limited by chatter. This form of chatter is undesirable because it results in premature tool wear, poor surface finish on the machined component and the possibility of serious damage to the machine itself. Modal testing is a form of vibration testing which is able to determine the Frequency Response Function (FRF) of the mechanical test structures. In this paper, the main focus is to obtain natural frequency values for machine tool components in order to establish better conditions in the cutting process on the machine tool. For this purpose, a 3D model of the machine tool’s part is made using design software and exported to analysis software. Later on, the Finite Element Method (FEM) modal analysis was used to obtain the natural frequencies. The model is evaluated and corrected through an experimental modal test. In the experiment, the machine tool vibration is excited by impact hammer and the response of excited vibration is recorded. In the end, the result of both FEM and experimental shows a good consistency in comparison.

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