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.

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.

Molecular Dynamics Simulation of Metal Cutting with Local Hydrostatic Pressure Field Formation

2012 ◽  
Vol 523-524 ◽  
pp. 167-172 ◽  
Author(s):  
Keito Uezaki ◽  
Jun Shimizu ◽  
Li Bo Zhou ◽  
Teppei Onuki ◽  
Hirotaka Ojima
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Hydrostatic Pressure ◽  
Plastic Flow ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Pressure Field ◽  
Dynamics Simulation ◽  
Burr Formation ◽  
Cutting Point

Improving machined surface integrity is one of the important issues in the precision machining. This study aims to develop a cutting tool, which enables to generate a local hydrostatic pressure field in the vicinity of the cutting point to suppress the extra plastic flow in the workpiece, because it is known that materials including metals never cause plastic flow and fracture no matter how much greater hydrostatic pressure field is given. In this paper, a simple cutting tool with planer jig is proposed and a molecular dynamics simulation of cutting is performed as the first step. As a result, it is confirmed that the reduction of the plastic deformation, mainly in the burr formation become remarkable with the proposed model due to the suppression of extra side plastic flow, and relatively high-hydrostatic stress field is formed in the vicinity of cutting point. However, it is also observed that relatively many dislocations are generated beneath the cutting groove.

A Comparative Study of Simulation Models on Incremental Forming Process by Using the Enhancement Tools

2019 ◽  
Vol 957 ◽  
pp. 93-102
Author(s):  
Khalil Ibrahim Abass
Keyword(s):  
Tool Path ◽  
Incremental Forming ◽  
Single Point ◽  
Simulation Models ◽  
Local Deformation ◽  
Process Models ◽  
Cnc Machine ◽  
Forming Process ◽  
Product Profile ◽  
Complex Forms

Incremental Forming IF is a suitable sheet metal forming technique for producing complex forms by local deformation. The forming tool movement follows the designed tool path controlled by the CNC machine programme. The main categories of the process are single point, SP and two points, TP "with enhancement tools". Additionally, the product design determines the enhancement tool type used and its obstacles. The enhancement tools are used for improvement of the product profile quality, while maintaining the simplicity of the process. The material formability is affected by mechanical properties and characteristics of the product profile. The limits are concerning the forming tools used and the blank thickness. On the other hand, due to the difficult environment of these process models, numerical methodologies controlled by Finite Element Method, FEM are currently in extensive use. The research offers the main data and results of a comparing study on the influence of using the enhancement tools in IF through FEM. The study purposes to identify the scientific differences of the IF processes, "with and without enhancement tools" by evaluating the thickness and strains distribution of the deformed blank section. In addition, the analysis and the evaluation of the final product profile have been studied.

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.

Design and development of automatic sheet metal cutting machine

2020 ◽  
Author(s):  
R. Muthu Siva Bharath ◽  
Arunkumar Gopal ◽  
I. Maria James ◽  
S. Lakshmi Sankar
Keyword(s):  
Sheet Metal ◽  
Metal Cutting ◽  
Metal Cutting Machine ◽  
Design And Development ◽  
Cutting Machine ◽  
Sheet Metal Cutting

scholarly journals Using SysML to Support Impact Analysis on Structural Dynamics Simulation Models

Procedia CIRP ◽  
2021 ◽  
Vol 100 ◽  
pp. 91-96
Author(s):  
Patrick Jagla ◽  
Georg Jacobs ◽  
Justus Siebrecht ◽  
Stefan Wischmann ◽  
Jonathan Sprehe
Keyword(s):  
Structural Dynamics ◽  
Impact Analysis ◽  
Simulation Models ◽  
Dynamics Simulation

A Generic, Geometric Approach to Accurate Machining-Error Predictions for 3-Axis CNC Milling of Sculptured Surface Parts: Part I — Modeling and Formulation

2006 ◽  
Author(s):  
Zezhong C. Chen ◽  
Wei Cai
Keyword(s):  
Tool Path ◽  
Cutting Tool ◽  
Geometric Model ◽  
Research Work ◽  
Geometric Approach ◽  
Cnc Machining ◽  
Sculptured Surface ◽  
Machining Error ◽  
Machining Errors ◽  
Tool Surface

In CNC machining, machining errors are usually caused by some of the sources such as cutting tool deflection, cutting tool wear, machine tool vibration, improper coolant/lubrication, and negative thermal effect. To increase product accuracy, much research has been carried out on the prediction of machining errors. However, in milling of sculptured surface parts, due to their curved shapes, the geometries of cutting tools do not match the parts’ surfaces well if the tools cut along the tool paths on the surfaces in a point-to-point way. As a consequence, machining error is inevitable, even if there is no other source of error in ideal machining conditions. To predict machining errors caused by this tool-surface mismatch, several methods have been proposed. Some of them are simple, and some represent the geometry of machined surfaces using cutter-swept surfaces. But none of these methods is accurate and practical. In this research work, a generic, geometric approach to predicting machining errors caused by the tool-surface mismatch is proposed for 3-axis sculptured surface milling. First, a new geometric model of the furrow formed by an APT tool moving between two neighboring cutter contact (CC) points is built. Second, the mathematical formula of cutting circle envelopes is derived. Then an algorithm for calculating machining errors in each tool motion is provided. Finally, this new approach is applied to two practical parts for the accurate machining-error predictions, and these predictions are then compared to the inaccurate predictions made by two established methods to demonstrate the advantages of this approach. This approach can be used in tool path planning for high precision machining of sculptured surface parts.

Metal Cutting Machine Tool Design—A Review

1997 ◽  
Vol 119 (4B) ◽  
pp. 713-716 ◽  
Author(s):  
S. B. Rao
Keyword(s):  
Machine Tool ◽  
Metal Cutting ◽  
Tool Design ◽  
Metal Cutting Machine ◽  
Machine Tool Design ◽  
Cutting Machine

This paper reviews the key developments in the area of metal cutting machine tool design over the last three decades, from a very practical perspective. While defining the drivers of machine tool design as higher productivity and higher accuracy, this paper examines the advances in design from the needs of these two drivers.

Sign in / Sign up

Export Citation Format

Share Document