Mathematical Cutting Model Based on Experimental Approach: Drilling Application

2011 ◽  
Vol 62 ◽  
pp. 77-84
Author(s):  
Jean Yves K'nevez ◽  
Olivier Cahuc ◽  
Philippe Darnis ◽  
Raynald Laheurte
Keyword(s):  
Cutting Tools ◽  
Geometrical Parameters ◽  
Geometrical Quality ◽  
Experimental Cutting ◽  
Three Stages ◽  
Set Up ◽  
Stage 1 ◽  
Physical Phenomena ◽  
Cutting Model

The object of this work research tasks relates to the improvement of the cutting tools in drilling within the industrial framework of the aeronautical assembly. The stakes of the study consist in optimizing the lifespan of the tools according to a criterion of respect of geometrical quality and surface quality of the bored holes. This optimization relates to the geometry of the cutting part of the drills. The discussion thread of work thus tends to set up methods which make it possible to bind the geometry of the tools to the final quality of borings carried out. The study was divided into three stages differentiated and complementary to modeling of the physical phenomena induced by the process of drilling. The first stage [1] lies in describing the real geometrical parameters according to the parameters of grinding of the tool. While being based on the modeling of the geometry, the experimental cutting model enables to identify the mechanical actions of cut along the edge. Lastly, the phenomenological [2] aspect of the process associates the parameters of cut the final quality of the bored holes. [3].

Experimental study on cutting flexible sheet materials using an oscillating knife

2017 ◽  
Vol 29 (3) ◽  
pp. 349-365 ◽  
Author(s):  
Quentin Cosson-Coche ◽  
Olivier Cahuc ◽  
Philippe Darnis ◽  
Raynald Laheurte ◽  
Denis Teissandier ◽  
...  
Keyword(s):  
Cutting Forces ◽  
Mechanical Characteristics ◽  
Content Type ◽  
Cutting Head ◽  
Straight Line ◽  
Physical Phenomena ◽  
The Impact ◽  
Cutting Model ◽  
Industrial Machine

Purpose The purpose of this paper is to understand the impact of the cutting forces on the quality of pieces in industrial cutting of multi-ply textile material. It also tries to establish a cutting model that can simulate the cutting forces in order to understand the behaviour of the blade. Design/methodology/approach Working on an industrial machine, a cutting head with an oscillating knife is instrumented with different sensors. Using this equipment, cutting forces can be analysed experimentally while the fabric is being cut along a straight line. Findings A model of the physical phenomena of the cutting forces is proposed, taking different parameters into account such as the geometry of the blade, the properties of the material being cut and the parameters of the cut. The simulated forces and the monitored forces are compared and parameters for minimising the cutting forces of fabrics are deduced. Research limitations/implications Due to the wide diversity of fabrics, all with different mechanical characteristics, this research only began with the study of denim in a straight cut. Originality/value This paper describes an instrumentation of automatic cutting head for textile. It manages to simulate the action of the fabrics on the blade through effort monitoring and help in the understanding of the multi-ply cutting process.

scholarly journals Supporting the decision during inter-operational inspection of the electrodes based on the ensemble of neural networks

Mechanik ◽  
2018 ◽  
Vol 91 (12) ◽  
pp. 1060-1063
Author(s):  
Halina Nieciąg ◽  
Rafał Kudelski ◽  
Krzysztof Zagórski
Keyword(s):  
Neural Networks ◽  
Flexible Manufacturing ◽  
Electro Discharge Machining ◽  
Tool Monitoring ◽  
Geometrical Quality ◽  
The Neural Networks ◽  
Physical Phenomena ◽  
Random Nature ◽  
Edm Process

In this paper the method based on the ensemble of artificial neural networks is presented for prediction of the geometrical quality of workpieces after electro-discharge machining (EDM). The complexity and random nature of physical phenomena accompanying the EDM process excluded the theoretical ways. The working electrodes were measured using CMM in flexible manufacturing system. The data obtained from inter-operational measurements were used for the neural networks training. Commonly used measures to express the tool wear turn out to be useless due to their large uncertainty. The tool monitoring and the ensemble method provided more stable diagnosis of the condition of the tool.

scholarly journals Analysis of advanced transpedicular screw machining technologies

2021 ◽  
Vol 24 (6) ◽  
pp. 1190-1198
Author(s):  
A. V. Savilov ◽  
A. S. Pyatykh ◽  
S. A. Timofeev
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Machine Tools ◽  
Cutting Tools ◽  
Maximum Efficiency ◽  
Machining Performance ◽  
Feed System ◽  
Transpedicular Screw ◽  
Set Up

Abstract: The purpose is to improve the machining efficiency of titanium alloy transpedicular screws on highperformance machine-tools based on the selection of advanced technological approaches, and to analyze the current manufacturing technology of implants on CNC machines of the semi-automatic longitudinal turning lathe type. The efficiency is assessed using the following criteria: process performance determined by the machine time and the quality of implant processing (surface roughness, geometric accuracy, mechanical properties). It is found that semi -automatic longitudinal lathes equipped with a collet feed system and drive heads for thread whirling allow processing the implants of the transpedicular screw type in a single set-up with maximum efficiency. It is shown that the machining technology of transpedicular screws is largely determined by the features of their design. The type and shape of the thread have the greatest influence on the used cutting tool and cutting modes. The analysis of screw breakages revealed that the main failure reasons are design defects and poor machining quality of the threaded part. It is determined that the use of the thread whirling method makes it possible to obtain the thread in one cutting pass and, therefore, significantly increase the machining performance compared to the traditional technology without any loss of quality. Additional advantages of this method are the reduction in the number of tools used and follow-on finishing deburring operations. Based on the conducted analysis the manufacture of transpedicular titanium alloy screws is recommended to perform using advanced cutting tools, primarily thread whirling cutters ensuring 4 times increase in machining performance without any loss of the processed item quality and 2 times reduced surface roughness. In this case the temperature in the cutting zone decreases, which has a positive effect on processed product service life. The condition for the effective use of the cutters is equipping of the machine-tools involved in the technological process with special drive heads.

Shipbuilding Erection Network Optimization: A TSP Method

2006 ◽  
Vol 22 (03) ◽  
pp. 139-146
Author(s):  
Ranjan Varghese ◽  
Duck Young Yoon
Keyword(s):  
Critical Path ◽  
Geometrical Parameters ◽  
Network Time ◽  
Software Product ◽  
Percentage Area ◽  
Block Data ◽  
Three Stages ◽  
The Traveling Salesman Problem ◽  
Stage 1 ◽  
The Given

In any shipyard the pre-erection area (PEA) and building dock area are prone to bottleneck formation during the shipbuilding process. This research has made an advancement toward easing this complication by adopting a popularly known genetic algorithm-based approach to the Traveling Salesman Problem (GA-TSP). The foundation and initial condition is projected by an erection sequence network diagram (ESND), which is readily available from the building schedulers in any shipyard. Here, a technology model has been developed that works in three stages: in stage 1, a data collection model is developed to gather the erection block data (geometrical parameters, such as length, breadth, and other attributes) and pitch data (the process delay time between the erection of the blocks); in stage 2, a path optimization model is developed with the erection day as a constraint; and in stage 3, a TSP-based model for the earliest (ENT) and the latest network time (LNT) has been developed. This model has been created to minimize the pre-erected block occupancy load at the PEA by balancing it over the entire working period and eventually fixing the block erection day by meeting optimal conditions of off-critical path blocks without compromising its erection priority. In this research the GA-TSP approach is applied to the given ESND to fix the dates of erection for individual blocks lying outside the critical path, as the uncertainty lies with the erection dates of the off-critical blocks. This solution is found by cross checking the percentage area occupancy in the PEA and by limiting the search span between ENT and LNT as it serves as the lower and the upper bound, respectively. This is compiled as a software product using VC++ compiler with the mentioned stages. Sample outputs show that the proposed methods are very effective in the tests performed. The software helps in easing the day-to-day complications of the schedulers while dealing with the yard data.

AN AUSTRALIAN GEODATA SYSTEM

1972 ◽  
Vol 12 (1) ◽  
pp. 161
Author(s):  
Michael J. Gahan
Keyword(s):  
Cross Sections ◽  
Petroleum Industry ◽  
Contour Maps ◽  
Second Stage ◽  
Routine Work ◽  
Third Stage ◽  
Three Stages ◽  
Set Up ◽  
Stage 1 ◽  
Areas Of Interest

Australia is in a very favourable position to set up a central petroleum industry data system particularly as no regional system is yet in operation. Large accessible computers are already available and other countries' experience ensures that a practical system can be evolved.There are three stages to be contemplated:The data input,Simple retrieval,Retrieval and processing.The first stage involves massive and for the most part, routine work but also includes problems of confidential information and interpretation. The second stage is useful for obtaining statistical information and to facilitate literature search. The third stage is open-ended encompassing automatic well correlations, contour maps, seismic cross-sections, reservoir estimations, etc.The Australian situation requires stage 1 and 2 to be introduced as soon as possible. Stage 3 is not recommended until more subsurface data has been obtained. Instead, a microfilm library of the most requested records could be accumulated.Most operating systems are under-used due to unfamiliarity. This can be overcome by supplying a regular output of information on areas of interest.

Design of objective lens for 200-kV high-resolution electron microscopes

1983 ◽  
Vol 41 ◽  
pp. 314-315
Author(s):  
K. Tsuno ◽  
T. Honda ◽  
Y. Harada ◽  
M. Naruse
Keyword(s):  
Optical Properties ◽  
Computer Technology ◽  
Axial Magnetic Field ◽  
Chromatic Aberration ◽  
Objective Lens ◽  
Resolution Electron ◽  
Correction Of Astigmatism ◽  
Three Stages ◽  
Electron Microscopes ◽  
Stage 1

Developement of computer technology provides much improvements on electron microscopy, such as simulation of images, reconstruction of images and automatic controll of microscopes (auto-focussing and auto-correction of astigmatism) and design of electron microscope lenses by using a finite element method (FEM). In this investigation, procedures for simulating the optical properties of objective lenses of HREM and the characteristics of the new lens for HREM at 200 kV are described.The process for designing the objective lens is divided into three stages. Stage 1 is the process for estimating the optical properties of the lens. Firstly, calculation by FEM is made for simulating the axial magnetic field distributions Bzc of the lens. Secondly, electron ray trajectory is numerically calculated by using Bzc. And lastly, using Bzc and ray trajectory, spherical and chromatic aberration coefficients Cs and Cc are numerically calculated. Above calculations are repeated by changing the shape of lens until! to find an optimum aberration coefficients.

STUDY OF INACCURACY IN THE OPERATION OF THE MAIN CONTROLLER OF STB MACHINE

2019 ◽  
Keyword(s):  
Normal Distribution ◽  
Stable Process ◽  
Random Errors ◽  
Actual Length ◽  
Experimental Data Processing ◽  
Set Up ◽  
Main Regulator ◽  
Transmission Gear ◽  
Selection Of

At production of fabrics, including fabrics for agricultural purpose, an important role is played by the cor-rect adjustment of operation of machine main regulator. The quality of setup of machine main controller is determined by the proper selection of rotation angle of warp beam weaving per one filling thread. In the pro-cess of using the regulator as a result of mistakes in adjustment, wear of transmission gear and backlashes in connections of details there are random changes in threads length. The purpose of the article is the research of property of random errors of basis giving by STB machine regulator. Mistakes can be both negative, and positive. In case of emergence only negative or only positive mistakes operation of the machine becomes im-possible as there will be a consecutive accumulation of mistakes. As a result of experimental data processing for stable process of weaving and the invariable diameter of basis threads winding of threads it is revealed that the random error of giving is set up as linear function of the accidental length having normal distribution. Measurements of accidental deviations in giving of a basis by the main regulator allowed to construct a curve of normal distribution of its actual length for one pass of weft thread. The presented curve of distribution of random errors in giving of a basis is the displaced curve of normal distribution of the accidental sizes. Also we define the density of probability of normal distribution of basis giving errors connected with a margin er-ror operation of the main regulator knowing of which allows to plan ways of their decrease that is important for improvement of quality of the produced fabrics.

The Rotterdam Initiative in Reducing Waste Discharges at Source

1991 ◽  
Vol 24 (10) ◽  
pp. 171-177
Author(s):  
T. Vellinga ◽  
J. P. J. Nijssen
Keyword(s):  
Public Relations ◽  
Action Plan ◽  
Detailed Balance ◽  
River Rhine ◽  
The North ◽  
Complementary Role ◽  
Action Programme ◽  
The North Sea ◽  
Set Up

Much of the material dredged from the port of Rotterdam is contaminated to such a degree that it must be placed in specially constructed sites. The aim of Rotterdam is to ensure that the dredged material will once again be clean. This will entail the thorough cleansing of the sources of the contamination of the sediment in the harbours and in the River Rhine. The Rotterdam Rhine Research Project (RRP) is one of the means to achieve this based on: technical research, legal research, public relations and dialogues with dischargers. The programme for five selected heavy metals is almost complete. For many heavy metal discharge points between Rotterdam and Rheinfelden, a specially devised independent load assessment has been carried out four times. Balance studies were used to determine the relative contributions of the point discharges to the total. Currently the results are being used in an attempt to negotiate agreements with a selected number of the major dischargers. At present, more detailed balance studies are being set up and exploratory measurements carried out for organic micropollutants. It may be concluded that the research is progressing successfully and methods and techniques developed seem satisfactory and broadly applicable. The Rhine Action Programme encompasses an international effort to improve the quality of the Rhine water. Although the RRP plays a modest complementary role to the Rhine Action Plan, there is no doubt of the value of this Rotterdam initiative. The mode of work followed in the RRP contains elements that can be of use in combatting the contamination of the North Sea by rivers other than the Rhine.

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