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Register a new userDecreasing of friction factor on machining alloyed steel by using compressed mixture in ternary directions
الإقلال من عامل الاحتكاك باستخدام تيار ثلاثي الاتجاه في أثناء خراطة الفولاذ السبائكي
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Authors
محمد زيدان( باحث )
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هدف البحث إلى تسهيل عملية تشغيل الفولاذ السبائكي الذي يحوي نسبًا محددة من النيكل و الكروم و المغنيزيوم و التيتانيوم و النحاس من خلال تبريده بخليط سائل مضغوط ثلاثي الاتجاه، يتألف الخليط من الماء و الزيت و الملح و الكبريت. استخدم سابقًا تيار مضغوط لكن باتجاه واحد، لكن استخدم في هذه الدراسة ضغط أقل و لكن بثلاثة اتجاهات شاقولي و أفقي و مواز يساري لمحور المشغولة مما يقلل من تكلفة الأجهزة المكلفة و الباهظة الثمن؛ و ذلك باستخدام معدات بسيطة و سهلة و غير مكلفة. تضمن البحث التخفيض في قيم قوى القطع و عامل الاحتكاك و تم التحول في شكل الرايش من المستمر إلى المتقطع في قوى القطع γ فضلا عن رفع عمر أداة القطع. درس تأثير قطر الفوهة في عامل الاحتكاك، و درس تأثير الزاوية و عامل الاحتكاك.
This research aims to facilitate the operation of machining alloyed steel ,which contains specific ratios of nickel, chromium, magnesia, titanium and copper, through three-direction compressed cooling by, liquid mixture. The mixture is composed of pressed water, pressed air, oil, salt and sulfur. Compressed mixture was used previously but only in one direction. This work uses ternary directions vertical, horizontal and parallel to axis of work piece, which reduces the cost of expensive equipment. The research studies the reduction in the values of cutting forces and friction factor. In ordinary machining the chips was continuous but our method it is discontinuous. The cutting tools life was increased. the effect of the nozzle diameter was also studied on the friction factor and effect of the angleγ on the cutting forces and friction factor was investigated.
References used
Резание Металлов .С.Н .Филоненко, стр 211 Киев. 1963
Отделочные операций в Машиностроение, И.Г. Космачев, В.Н.Дугин, Б.А.Немцев. Лениздат. 245стр.1985
Технология Машиностроение .Г. П . Мосмалыгин, Н .Н. Т олмачевский, стр 287, Москва, Машиностроение ,1990
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This paper reports the results of an experimental investigation
carried out to study the effects of machining parameters such as
pulsed current on material removal rate, diameteral overcut,
electrode wear and surface roughness in electric discharg
e
machining of En-31 tool steel (IS designation: T105 Cr 1 Mn 60)
hardened and tempered to 55HRc. The work material was ED
machined with copper, copper tungsten, brass and aluminum
electrodes by varying the pulsed current at reverse polarity.
The thickness of the diffusion layers was studied, along with the phases and the microstructure and
composition, across the depth in diffusion zone. The obtained results proved the effect of nitriding
system in the growth of the diffusion layers on
surface of double composite martensitic - austenitic alloy
steel.
Analysis of mechanical and tribological characteristics of treated double composite steel under dry
friction was also studied. It was found that diffusion treatment had a significant influence on work
capacity of tested alloy. Stability of alloy after nitriding was (2.5-4) times higher in magnitude
compared to untreated alloy.
فولاذ سبائكي ذو بنية مركبة
تقسية و إرجاع
نتردة غازية
بنية و تركيب طوري
طبقات انتشارية
قساوة سطحية
خواص ميكانيكية و تريبولوجية
Double composite alloy steel
hardening and tempering
gas nitriding
diffusion layers
microstructure and phase composition
surface hardness
mechanical and tribological properties
المزيد..
This paper presents a new technique based on artificial neural networks (ANNs) to
correct power factor. A synchronous motor controlled by the neural controller was used to
handle the problem of reactive power compensation of the system, in order to
correct
power factor.
In this paper, the electrical system and the neural controller were simulated using
MATLAB. The results have shown that the presented technique overcomes the problems
in conventional compensators (using static capacitors) such as time delay and step changes
of reactive power besides to the fast compensation compared to the technique with
capacitors groups.
For voice assistants like Alexa, Google Assistant, and Siri, correctly interpreting users' intentions is of utmost importance. However, users sometimes experience friction with these assistants, caused by errors from different system components or us
er errors such as slips of the tongue. Users tend to rephrase their queries until they get a satisfactory response. Rephrase detection is used to identify the rephrases and has long been treated as a task with pairwise input, which does not fully utilize the contextual information (e.g. users' implicit feedback). To this end, we propose a contextual rephrase detection model ContReph to automatically identify rephrases from multi-turn dialogues. We showcase how to leverage the dialogue context and user-agent interaction signals, including the user's implicit feedback and the time gap between different turns, which can help significantly outperform the pairwise rephrase detection models.
This research aims to inspect the defects and discontinuities in steel billet by
ultrasonic detector. Straight beam probe used to detect a lot number of imported steel
billets that clearly have internal defects.
The results showed the possibility
of initial detection by straight beam probe, and
initial defining the types of defects such as, micro and macro cracks, shrinkage defect,
blow holing, inclusion, porosity and others type of internal defects.
The experiments showed that if the necessity is defining the size of defects, this
requires angle beam probe in addition to straight beam probe.
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