The Thermal Effect of Unconventional Cutting Technologies on Steel DIN 1.7102

2020 ◽  
Vol 994 ◽  
pp. 78-87
Author(s):  
Pavel Stoklásek ◽  
Aleš Mizera ◽  
Miroslav Manas ◽  
Martin Ovsik
Keyword(s):  
Thermal Effect ◽  
High Speed ◽  
New Technologies ◽  
Electrical Discharge Machining ◽  
Thin Sheet ◽  
Cutting Edge ◽  
Steel Sheets ◽  
Complex Shapes ◽  
Cut Surface

New technologies known as unconventional technologies make it possible to cut complex shapes at high speed and with relatively high precision. In many cases, especially in the case of thin sheet, created parts produced do not require any further treatment by post-machining. Knowledge of the accompanying phenomena, such as the heat-affected zone (HAZ) or the surface quality of the cutting edge, is necessary, for example, to assess further machining of material in these areas (e.g. drilling and reaming holes or finishing operations on the cutting edge). In this study, the thermal effect of four unconventional cutting technologies – laser, plasma, wire electrical discharge machining (wire EDM) and waterjet cutting on the cut surface of steel sheets is investigated. Steel 1.7102 (DIN 54SiCr6) was chosen for purpose of this study. The width of the HAZ and the nanohardness beneath the cut surface were analyzed.

Defects of Steel Sheets Joined by Laser Welding

2020 ◽  
Vol 405 ◽  
pp. 240-244
Author(s):  
Atila Drotár ◽  
Pavol Zubko ◽  
Alicia Mašlejová ◽  
Peter Kalmár ◽  
Peter Vranec ◽  
...  
Keyword(s):  
Quality Evaluation ◽  
New Technologies ◽  
Sheet Thickness ◽  
Relative Displacement ◽  
Point Of View ◽  
Cutting Edge ◽  
Butt Welding ◽  
Steel Sheets ◽  
Shear Edge

Introduction of new technologies demands a new access to quality evaluation of products. Joining of steel sheets with laser butt welding requires increased demand on precision of welded sheet ends alignment as well as condition of cutting edge. Moreover, increased requirements are placed on purity of environment, flatness of strips, gases, etc. The paper deals with evaluation of quality of laser butt welds of steel sheets and description of defects which could occur on welds from the metallographic point of view. The influence of relative displacement of welded strips ends alignment, different relative sheet thickness alignment, welding gap size and quality of sheet shear edge on quality of weld will be described. The most significant effect on quality of weld joints and their final mechanical properties has relative position of strip ends and geometry of cutting edge.

Shearing Edging Investigation in High-Speed Blanking Process Applying Precision Progressive Die

2013 ◽  
Vol 668 ◽  
pp. 460-464
Author(s):  
Zhen Yuan Huang ◽  
Feng Ruan
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
Orthogonal Experiment ◽  
Thin Sheet ◽  
Progressive Die ◽  
Small Complex ◽  
Thin Sheet Metal ◽  
The One ◽  
Blanking Process

The high-speed blanking process applying precision progressive die represents the one of the highest level of today’s stamping technology, mainly is used for the production of the ultra-thin, small, complex electronic components. An orthogonal experiment scheme with three factors (including blanking clearance, surface roughness of the die, stamping speed) was established in this paper based on the actual production. The high-speed blanking process experiment applying precision progressive die was carried out base on this scheme. The quality of the shearing edging of blanking parts was used to evaluate the different influence degree of three factors. The result showed that the surface roughness of the die affected the quality of the shearing edging more than that of the other two. The higher the die surface accuracy, the better the quality of the shearing edging. The result also showed that the high speed can reduce the quantity of the burr of the blanking of the ultra-thin sheet metal.

Dry WEDM in Improving HS-WEDMed Surface Quality

2008 ◽  
Vol 392-394 ◽  
pp. 624-628 ◽  
Author(s):  
Tong Wang ◽  
Yu Mei Lu ◽  
Shuang Shuang Hao ◽  
Shu Qiang Xie ◽  
Xiao Cun Xu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Material Removal ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Dry Wedm ◽  
Finish Cut ◽  
The Relationship

This paper studies the surface quality of mould steel with high-speed wire electrical discharge machining (WEDM) method, which is conducted in gas to improve the accuracy of finish cut, and compares the surface quality in atmosphere and in emulsion dielectric. Experiment results showed that WEDM in atmosphere offers advantages such as better surface roughness and higher material removal rate. The relationship about winding speed and worktable feed on WEDMed surface quality in semi-finishing cut and finishing cut had been obtained. Morover, a new attemption was successful in applying dry WEDM in multiple cut to improve surface roughness.

Dry WEDM in Improving LS-WEDMed Surface Quality

2008 ◽  
Vol 53-54 ◽  
pp. 387-392 ◽  
Author(s):  
Tong Wang ◽  
Yu Mei Lu ◽  
Shu Qiang Xie ◽  
Shuang Shuang Hao ◽  
H. Zhao
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Wire Electrical Discharge Machining ◽  
Dry Wedm ◽  
Cut Surface ◽  
Discharge Gap

Utilizing gas as the dielectric instead of dielectric liquid has enabled the development of dry wire electrical discharge machining (dry WEDM) technology for finishing cut. Experiment results showed that Low-Speed WEDM (LS-WEDM) in gas offers advantages such as better straightness, and shorter discharge gap. This paper studies on influence of different gas dielectrics, wire winding speed and pulse duration on the WEDMed surface quality (discharge gap, straightness, surface roughness, removal rate) in finishing. New attempt of applying dry WEDM as the 4th cut had been proved feasible in improving conventional multiple cut surface quality of LS-WEDM.

New Technologies for Increasing the Capacities of WEDM Machines

2012 ◽  
Vol 713 ◽  
pp. 97-102
Author(s):  
Jose Antonio Sánchez ◽  
Soraya Plaza ◽  
J.M. Ramos ◽  
B. Izquierdo ◽  
N. Ortega ◽  
...  
Keyword(s):  
High Speed ◽  
New Technologies ◽  
Electrical Discharge Machining ◽  
Low Cost ◽  
Machine Intelligence ◽  
Added Value ◽  
Research Approach ◽  
Integrated Research ◽  
Industrial Needs ◽  
New Generation

The process of Wire Electrical Discharge Machining (WEDM) has experienced a dramatic growth in the last years. Together with the new requirements imposed by customer needs, globalization of the markets has brought about a new scenario in which competitiveness is the keyword. In the case of WEDM, it is only possible from a perspective that integrates developments in hardware, software and know-how, to generate the required added-value with respect to competitors. For instance, it is not enough to give an answer to the demand of a high-speed first cut: economy must be achieved together with a high accuracy and using low-cost wires. In this paper the research actions currently running aiming at the development of a new generation of WEDM machines are presented. The objective of this paper is to present an integrated research approach focused on industrial needs, covering the following aspects: Accuracy and productivity; automation and machine intelligence; eco-efficiency.

Study on Dry WEDMed Surface Quality of Mould Steel

2008 ◽  
Vol 375-376 ◽  
pp. 416-420 ◽  
Author(s):  
Tong Wang ◽  
Xin Fu Zhang ◽  
Xue Fang Zhao
Keyword(s):  
Surface Quality ◽  
Electrical Discharge ◽  
Material Removal ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Finish Cut ◽  
Straightness Error ◽  
Discharge Gap

This paper studies the surface quality of tool steel with high-speed wire electrical discharge machining (WEDM) method, which is conducted in gas to improve the accuracy of finish cut, and compares the surface quality in atmosphere and in emulsion dielectric. Experiment results showed that WEDM in atmosphere offers advantages such as better straightness and higher material removal rate. With the growth of wire winding speed, the removal rate and straightness error will increase significantly either in atmosphere or in liquid. Along with the feed increasing, the discharge gap lengthes decrease successively under the both media conditions, and the straightness is obviously improved in atmosphere. Regardless of the use of atmosphere or emulsion, an optimum feed will exist, which makes the roughness the lowest and the removal rate the highest.

scholarly journals The assessment of properties for selected factors in abrasive water jet process

2015 ◽  
Vol 21 (3) ◽  
pp. 203
Author(s):  
Anna Šúňová ◽  
Roman Šúň ◽  
Emil Spišák ◽  
Mária Franková
Keyword(s):  
Water Jet ◽  
Cutting Edge ◽  
Abrasive Water Jet ◽  
Water Jet Cutting ◽  
Cutting Surface ◽  
Abrasive Water Jet Cutting ◽  
Cutting Rate ◽  
Cutting Velocity ◽  
Cut Surface

The article presents the current conditions of abrasive water jet cutting process and factors relative to the quality of cutting surface. The main goal of research was to evaluate the assessment of the cutting depth, corrugated bottom cutting edge and roughness of the specimens depending on selected factors such as cutting velocity and abrasive amount in the abrasive water jet process. Specimen were cut in four phases as a square. Main results were that the distance between water jet entering and water jet leaving is decreased with the increasing abrasive amount and by following lower cutting rates. The increasing of a cutting rate negatively effects the quality of the cut surface and the size of the distance between water jet entering and water jet leaving, because the increasing of a cutting rate increases also values of the mentioned parameters. As to the distance between water jet entering and water leaving, the abrasive amount of 200-250 g.min-1 at the rate of 50 mm.min-1 is considered to be optimal, but outside this range the influence of the abrasive amount impacts negatively, primarily on water jet entering and water jet leaving that has a direct influence on the corrugated bottom cutting edge.

Effect of Powder-Mixed Dielectric on EDM Process Performance

2020 ◽  
Vol 38 (8A) ◽  
pp. 1226-1235
Author(s):  
Safa R. Fadhil ◽  
Shukry. H. Aghdeab
Keyword(s):  
Silicon Carbide ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
High Speed Steel ◽  
Transformer Oil ◽  
Dielectric Fluid ◽  
Peak Current ◽  
Powder Concentration ◽  
Pulse On Time

Electrical Discharge Machining (EDM) is extensively used to manufacture different conductive materials, including difficult to machine materials with intricate profiles. Powder Mixed Electro-Discharge Machining (PMEDM) is a modern innovation in promoting the capabilities of conventional EDM. In this process, suitable materials in fine powder form are mixed in the dielectric fluid. An equal percentage of graphite and silicon carbide powders have been mixed together with the transformer oil and used as the dielectric media in this work. The aim of this study is to investigate the effect of some process parameters such as peak current, pulse-on time, and powder concentration of machining High-speed steel (HSS)/(M2) on the material removal rate (MRR), tool wear rate (TWR) and the surface roughness (Ra). Experiments have been designed and analyzed using Response Surface Methodology (RSM) approach by adopting a face-centered central composite design (FCCD). It is found that added graphite-silicon carbide mixing powder to the dielectric fluid enhanced the MRR and Ra as well as reduced the TWR at various conditions. Maximum MRR was (0.492 g/min) obtained at a peak current of (24 A), pulse on (100 µs), and powder concentration (10 g/l), minimum TWR was (0.00126 g/min) at (10 A, 100 µs, and 10 g/l), and better Ra was (3.51 µm) at (10 A, 50 µs, and 10 g/l).

The implementation of test control methods for the improvement of the quality content of high education in medical higher educational institution

2018 ◽  
Vol 22 (2) ◽  
pp. 357-360
Author(s):  
S. A. Kolodii ◽  
Yu. V. Kordon ◽  
O. A. Nazarchuk ◽  
N.I. Osadchuk
Keyword(s):  
New Technologies ◽  
Educational Institution ◽  
Scientific Information ◽  
Cognitive Activity ◽  
Pedagogical Training ◽  
Highly Skilled ◽  
Medical University ◽  
Independent Work ◽  
Test Control

The integration of Ukrainian system of Higher education into the European one accompanies by a transformation processes. The main goal of Higher school in our country is to prepare competitive specialists. The pedagogues of medical universities implement modern educational technologies with the use of analytically-searching work and scientific information. The implementation of new technologies of teaching is the important task of modernization of pedagogical system of mastering highly skilled specialists. The aim — to ground the implementation of test control for the estimation of quality of knowledge of future doctors. Gaining knowledge in microbiology is very necessary for future doctors to understand the principals of diagnostics and struggling infectious diseases. Knowledge in microbiology is basis for better understanding of clinical disciplines, as it assists logical perception of clinical data, influences on the forming clinical thought without which it is impossible to become a highly skilled specialist. The implementation of modern methods of studies, control, providing the increase of creative activity of students, forming and developing in them professional thought is one of the effective way of the improvement of quality of pedagogical training of highly skilled doctors. The experience of applying of the test control of knowledge in students in the medical university at classes of Microbiology, Virology and Immunology has been presented in the manuscript. The use of different types of test control has been proved to be one of the effective methods for determining the level of knowledge among students. Test control promotes the activation of cognitive activity, forms students’ skills of independent work, develops their logical thinking. Test control of obtained knowledge should be used in conjunction with other methods of studying the subject. The analysis of the results of the writing of the KROK-1 qualification exam by the students of the stomatological department has been conducted. The use of different methods of estimation of control of knowledge is necessary for its improvement. The study of microbiology is the important base of forming fundamental knowledge in students. Therefore, test control in a complex with other pedagogical methods can be used as one of the important and optimal methods to improve estimation of the basic level of students’ knowledge.

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