scholarly journals Nonlinear repetitive control of the metal cutting machine feed module with saturated input

2021 ◽  
pp. 240-247
Author(s):  
Eugenie L. Eremin ◽  
Larisa V. Nikiforova ◽  
Evgeniy A. Shelenok
Keyword(s):  
Control System ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Reference Model ◽  
Input Saturation ◽  
Structural Synthesis ◽  
Cutting Machine ◽  
Solution Methods ◽  
Periodic Signals

The article discusses the methodology for constructing an automatic control system for the feed module of the cutting tool for lathes in the presence of input saturation. The presence of the saturation function is due to restrict unwanted movements of the feed module actuator. The generator for periodic signals, the hyperstability criterion, L-dissipativity conditions and an implicit reference model are used as the solution methods for structural synthesis of the control system. At the stage of simulation, the functioning quality of the developed control system is illustrated.

Dynamics of the processes in metal machining

1998 ◽  
Vol 2 ◽  
pp. 115-122
Author(s):  
Donatas Švitra ◽  
Jolanta Janutėnienė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Cutting Machine ◽  
Metal Machining

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

Regulation of an ovulatory cycle

1998 ◽  
Vol 2 ◽  
pp. 107-114 ◽  
Author(s):  
D. Švitra ◽  
R. Grigolienė ◽  
A. Puidokaitė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Ovulatory Cycle ◽  
Cutting Machine

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

scholarly journals Construction of a specialized control system for brush machine and rounding the cutting edges of a metal cutting tool

2019 ◽  
Vol 298 ◽  
pp. 00064
Author(s):  
Petr Nikishechkin ◽  
Nikita Grigoriev ◽  
Nadezhda Chervonnova
Keyword(s):  
Control System ◽  
Metal Cutting ◽  
Structural Model ◽  
Cutting Tool ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Machine Control ◽  
Metal Cutting Tool

The basic aspects of preparing a cutting tool for applying wear-resistant coatings to it, in particular, the use of brush technology to round its cutting edges, are investigated. A structural model for constructing a specialized brush machine control system has been developed and the basic aspects of its development have been determined.

The use of assembled cutting tool with damping elements to reduce mechanical vibrations

2021 ◽  
Author(s):  
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Cutting Tool ◽  
End Mill ◽  
Mechanical Vibrations ◽  
Machined Surface ◽  
High Speed Cutting ◽  
End Mills ◽  
Cutting Modes

Aspects of vibration reduction during machining on metal-cutting machines to improve the quality of machined surfaces at moderate and high-speed cutting modes are considered. End mills with damping elements made of different materials, which provide the control of tool rigidity, are developed. Keywords: vibrations, end mill, vibrations, machined surface, damping. [email protected]

Application of smart fluid to control vibration in metal cutting: a review

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
S. Sarath ◽  
P. Sam Paul
Keyword(s):  
Real Time ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Mr Damper ◽  
Machining Process ◽  
Time Varying ◽  
Tool Vibration ◽  
Content Type ◽  
Service Period

Purpose A new cutting tool is always well-defined and sharp at the onset of the metal cutting process and gradually losses these properties as the machining process advances. Similarly, at the beginning of the machining process, amplitude of tool vibrations is considerably low and it increases gradually and peaks at the end of the service period of the cutting tool while machining. It is significant to provide a corresponding real-time varying damping to control this chatter, which directly influences accuracy and quality of productivity. This paper aims to review the literature related to the application of smart fluid to control vibration in metal cutting and also focused on the challenges involved in the implementation of active control system during machining process. Design/methodology/approach Smart dampers, which are used as semi-active and active dampers in metal cutting, were reviewed and the research studies carried out in the field of the magnetorheological (MR) damper were concentrated. In smart materials, MR fluids possess some disadvantages because of their sedimentation of iron particles, leakage and slow response time. To overcome these drawbacks, new MR materials such as MR foam, MR elastomers, MR gels and MR plastomers have been recommended and suggested. This review intents to throw light into available literature which exclusively deals with controlling chatter in metal cutting with the help of MR damping methods. Findings Using an MR damper popularly known for its semi-active damping characteristics is very adaptable and flexible in controlling chatter by providing damping to real-time amplitudes of tool vibration. In the past, many researchers have attempted to implement MR damper in metal cutting to control vibration and were successful. Various methods with the help of MR fluid are illustrated. Research limitations/implications A new cutting tool is always well-defined and sharp at the onset of metal cutting process and gradually losses these properties as the machining process advances. Similarly, at the beginning of the machining process, amplitude of tool vibrations is considerably low and it increases gradually and peaks at the end of service period of cutting tool while machining. Application of MR damper along with the working methodology in metal cutting is presented, challenges met are analyzed and a scope for development is reviewed. Practical implications This study provides corresponding real-time varying damping to control tool vibration which directly influences accuracy and quality of productivity. Using an MR damper popularly known for its semi-active damping characteristics is very adaptable and flexible in controlling chatter by providing damping to real-time amplitudes of tool vibration. Social implications This study attempts to implement smart damper in metal cutting to control vibrations. Originality/value It is significant to provide corresponding real-time varying damping to control tool vibration which directly influences accuracy and quality of productivity.

Quality scale the design of a metal-cutting machine

2021 ◽  
pp. 70-72
Author(s):  
B.M. Dmitriev
Keyword(s):  
Metal Cutting ◽  
Quality Measurement ◽  
Thermodynamic System ◽  
Measurement Unit ◽  
Metal Cutting Machine ◽  
Design Quality ◽  
Static State ◽  
Cutting Machine ◽  
Quality Scale

A method is proposed for assessing the quality of a working structure, based on its study as a thermodynamic system, in contrast to its accepted assessment in a static state. This interpretation requires the use of an indirect method for assessing the quality of the structure during operation. Keywords: machine tool design, design quality, measurement unit, quality scale. [email protected]

Method of Evaluation of Quality of Metal-Cutting Tool

2013 ◽  
Vol 379 ◽  
pp. 49-55 ◽  
Author(s):  
M.S. Ostapenko ◽  
D.S. Vasilega
Keyword(s):  
Metal Cutting ◽  
Cutting Tool ◽  
Technical Performance ◽  
Metal Cutting Tool ◽  
Method Of Evaluation

The method of estimation of quality of metal-cutting tool is developed. They determined consumer requirements, factors of use conditions, technical performance. They showed, that the temperature of cutting is the factor which connects al important features. The model of quality of collapsible lathe tools is created on the basis of it.

scholarly journals Automatic Pneumatic Sheet Metal Feeding and Cutting Machine

2021 ◽  
Vol 9 (11) ◽  
pp. 150-165
Author(s):  
Mr. Pratik Gujarathi
Keyword(s):  
Sheet Metal ◽  
High Speed ◽  
Metal Cutting ◽  
Control Valve ◽  
Everyday Objects ◽  
Cutting Machine ◽  
Long Time ◽  
High Production ◽  
Sheet Metal Cutting

Abstract: Today in the rapid competition of the industries to get the best quality of the product in the minimum required time is the main aim of industries. To get the best quality and maximum production most advanced machines are used. But there are no facts that use only the advanced machines, to maintain their performance is real requirement of the industries, also to give proper facilities to the workers with good environmental condition and to reduce their efforts is one of the objects to achieve the best quality and high production. Sheet metal is simply a metal formed into thin and flat pieces. It is one of the fundamental forms used in metal working and can be cut and bent into a variety of different shapes. Countless everyday objects are constructed of the material. Thicknesses can vary significantly, although extremely thin thicknesses are considered foil or leaf, and pieces thicker than 6 mm (0.25 in) are considered plate. Sheet metal also has applications in car bodies, airplane wings, medical tables, roofs for buildings (Architectural) and many other things. Sheet metal of iron and other materials with high magnetic permeability, also known as laminated steel cores, has applications in transformers and electric machines. There are three primary procedures in Layout. They are Parallel, Radial, and Triangulation. The major aim to our experiment is to study about pneumatic control system, study about double acting cylinder, study about the advantage of pneumatic hand operated valve and study about high speed blade. We are using scissors for simple sheet metal cutting. It is a manual method so that sheet metals are to be wasted sometimes because of mistakes happened such as wrong dimensions etc., and also even a simple cutting may take long time. We are using a pneumatic system for sheet metal cutting in an easy way. It is operated by a pneumatic hand lever of two ways control valve. Control valve is operated by a compressor. Keywords: Pneumatic, Automation, Sheet Metal, Pneumatic, Valve, Cutting Machine

scholarly journals Cut Correctly

2008 ◽  
Vol 130 (04) ◽  
pp. 24-26
Author(s):  
Jean Thilmany
Keyword(s):  
Metal Cutting ◽  
Tool Path ◽  
Cutting Tool ◽  
Simulation Models ◽  
Process Models ◽  
Dynamics Simulation ◽  
Cutting Machine ◽  
Software And Hardware ◽  
Smart Machining ◽  
Smart Machine

This article discusses engineering initiatives to develop a metal cutting machine that helps program itself and trim manufacturing costs. The smart machine, which was predicted be ready for its debut by mid-2010, would save manufacturers’ time and expense by greatly reducing waste and by speeding the machine-cutting process. The smart machine, with the help of its onboard software, will know the best way to make a part. It will generate its own cutting tool path based on that information and its own tool list. The goal of this smart machine is to use software and hardware in a way to create a machine that constantly monitors itself and conveys vital information to the operator and process planner. Engineers are creating process and structural dynamics simulation models. A process planner would use the models to simulate various scenarios before manufacturing begins. The chapter also highlights that the overall smart machining challenge now is to develop sensors that will monitor a machine and give vital feedback to the process models that need that information.

Laser Modification of Metal Cutting Tool: Assessment of the Influence on Wear Resistance and Quality of the Processed Surface

2020 ◽  
Vol 836 ◽  
pp. 118-123
Author(s):  
S.K. Kargapol’tsev ◽  
V.I. Shastin ◽  
V.E. Gozbenko
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Machined Surface ◽  
Laser Modification ◽  
Metal Cutting Tool ◽  
The Impact

The paper reflects the relevance of hardening the working surfaces of the tool, where the surface layer plays a fundamental role. The main factors determining the wear resistance of the tool and their influence on the quality of the processed surface are analyzed. The purpose of the research is to study the effect of laser modification of tool alloys on wear resistance and on the roughness parameters of the machined surface. A small-sized drill bit (steel P6M5) and carbide inserts T15K6 are used as objects of research. The paper presents the results of experimental studies on the impact of laser radiation on the microstructure of materials, indices of wear resistance and quality parameters of the treated surface. It is established that there is a certain relationship between these indices. The modes of laser modification of the tool most acceptable for practical use are determined. Along with an increase in the wear resistance of a metal-cutting tool, a manifestation of the effect of an increase in surface roughness indices is found and experimentally confirmed. It is established that hardening of the surface layer is caused by structural and phase transformations with enhanced physical and mechanical properties, and the roughness indices depend on the degree of dispersion (amorphization) of the modified layer.

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