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Calculus Challenge Comments

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD, #46   Comments on A Calculus Challenge   I would like to thank all those who took part in the Challenge. My solutions and comments are attached. 46 CalcChallengeComments.pdf

DrD

DrD

 

A Calculus Challenge

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD, #45 (c) DrD, 2018 It has been quite a while since I last posted anything here, but an interesting problem has come to mind that I wanted to share with you. If you really know calculus, this should be straight forward; if you don't know calculus, don't even try! MEForumChallenge.pdf   *********************************************************************************************************** THE  CHALLENGE IS NOW ENDED. I WILL NOT RESPOND TO FURTHER ANSWERS. i EXPECT TO POST A SOLUTION AND A FEW COMMENTS IN THE NEXT FEW DAYS. ***********************************************************************************************************

DrD

DrD

 

Mechanical Interview Questions and Answers 2018 Topics: Boiler Exceptional Question

For the job placement in the mechanical engineering private companies, it is very necessary to know about the very important mechanical engineering interview questions and answers. During the interview session, the employer can ask you the mechanical engineering basic questions to examine your knowledge about your subject and sector. If you planning to seat in the job placement, these frequently asked mechanical engineering questions and answers will help you in reply to the employer questions. These mechanical engineering interview questions and answers are meant for the purpose of a job interview and getting an idea of interview question for fresher.   Today we are going to discuss Mechanical Interview Questions and Answers-Topics:  Boiler In this video we discuss the following question with answer: Question Number 1. What is boiler? Question Number 2: What are the boiler mountings? Question Number 3. What are boiler accessories? Question Number 4. What is circulation ratio of a boiler? Question Number 5. What is turn down ratio of boiler? Question Number 6. What is foaming of boiler? Question Number 7. What is priming of boiler? Question Number 8. What is critical point of steam? Question Number 9. What is evaporation ratio of Boiler? Question Number 10. What is acid due point in boiler? Question Number 11. What is gross calorific value and net calorific value of coal?   You will all answer after see this video: https://youtu.be/ANifcZlS9Mg  

Engr Anik

Engr Anik

 

Top 12 Basic Common Questions Asked in Mechanical Engineering Interview 2018

For the placement in the mechanical engineering companies, it is very necessary to know about the important mechanical engineering interview questions and answers. During the interview, the interviewer can ask you the mechanical engineering technical questions to examine your knowledge about your subject and field. If you planning to seat in the placement, these frequently asked mechanical engineering questions and answers will help you in reply to the interviewer’s questions. These mechanical engineering interview questions and answers are meant for the purpose of a job interview and getting an idea of interview question.   Today we are going to discuss top 12 Basic Common Questions Asked in Mechanical Engineering Interview session.   Basically this video is helpful for fresh mechanical graduate engineer to help him how to answer common mechanical question that has been asked in interview. A mechanical fresh student gain knowledge about top 12 common mechanical questions.  It also helps for fresher mechanical student to take preparation for facing interview. Here we listed some mechanical basic common questions and answer that has been asked in the video: Question Number 1:  what is heat treatment and why is it done? Answer: Heat treatment can be defined as a combination of processes or operations in which the heating and cooling of a metal or alloy is done in order to obtain desirable characteristics without changing the compositions. Some of the motives or purpose of heat treatment are as follows: In order to improve the hardness of metals.  For the softening of the metal.  In order to improve the mach inability of the metal.  To change the grain size. To provide better resistance to heat, corrosion, wear etc. Question Number 2:  Why do heavy vehicles use diesel engine? Answer: The compression ratio of diesel engine is higher than the petrol engine, the reason for producing higher torque. The efficiency of diesel engine increases with load. Diesel produces slow energy on burning of fuel and the efficiency of the engine increases with load which is why diesel engine is suitable and largely used for heavy vehicles Question Number 3: what are types of heat treatment? Answer: Heat treatment is generally performed in the following ways: Normalizing Annealing Spheroidising Please watch this video till end to get the full questions with answer. Here is the link:    

Engr Anik

Engr Anik

Internship adds up an extra mile to mechanical engineers who are seeking for higher studies or career options after graduation.

In today's market there are lot of mechanical engineers who are seeking for career building at different stages of their career, one who just recently graduated looking for masters or seeking for jobs, and a case of already employed is looking for career growth. Mechanical engineers has lots of option to choose from mechatronics, automotive,aerospace, production, robotics, power, computational sciences, plastics, nanotechnology, Industrial engineering ,Engineering & management and many more. SO, WHAT ACTUALLY IS AN INTERNSHIP? An internship is a period of work experience offered by an employer to give students and graduates exposure to the working environment, often within a specific industry,which relates to their field of study. Internships can be as short as a week or as long as 12 months. They can be paid or voluntary; however, before you start an internship it’s important to know your rights with regards to getting paid. Internships can be done in a range of sectors, including sales,  marketing,  engineering,  graphic design, management, I.T. and many, many more. Throughout an internship you will develop a variety of soft skills, including communication skills, personal effectiveness, presentation skills, creative problem solving and influencing skills. ‘On-the-job’ experience can be as valuable as anything learned in your studies. After all, you cannot really understand what a job is all about until you have worked in that environment. Internships are great opportunities to speak directly to people who have experience in the role you aspire to; and their knowledge of the job and working environment will give you a greater understanding of what it’s all about and what you need to do to progress. Your career aspirations may change when you’re faced with the true realities of a role. Internships can therefore be used as a ‘try before you buy’ option, before you embark on a career and confirm if this is what you want to do in the long term. Internships can give you a genuine knowledge into the universe of work, enabling you to expand on the hypothesis you learned at college and helping you to increase commonsense aptitudes that will help reinforce your CV and make you more employable. Entry levelpositions offer you the opportunity to test your abilities, in actuality, circumstances, investigate your profession alternatives and gain a knowledge into an organisation or career path. WHAT MATTERS THE MOST. Many foreign universities look for Internships, Certifications, work experience, recommendations and give more importance how good your statement of purpose is drafted at the time of application to give admission. Before Graduating participating in extra circular activities, attending various technical seminars, workshops and passing in any design certification exam will have an edge over getting admission in top universities apart from the score secured in competitive exams like GRE, GATE,TOEFL,IELTS. Every hour is more valuable after graduating, if u been rejected/or not qualified to the universities, you have to wait for a couple of months more to reapply and time keeps on ticking off . After graduating seek internships with the help of your parents, friends ,relatives or any providers in the market , which will add value to your profile rather than just waiting for the outcome of the further process. Internship will fill the void in your resume for any future endeavors & boosts your skill capability individually. If you have been geared up with the required skills with a minimum experience & exposure of work ,it might help you in seizing the opportunity when given to you. These Internship programs might be paid depending upon the outcome of the work & effort you have put in benefiting to the organisation . Mechanical Internships will be accessible in both design & manufacturing segment who are keen in improving their technical ability & working towards to their career path. Many young entrepreneurs are keen in picking up these graduates who wish to work as intern for couple of months and would recruit few of them if they perform outstanding among all. Mechrise is one such organisation creating a wonderful platform by bridging the gap between the academia & Industry for mechanical engineers who are seeking for internships . I am particularly glad and pleased with the kind of service, attention they take on each and every candidate advising career opportunities along with the skills required at industry level says Mr A. Jayan MD of NEC Pvt Ltd. For more information Click the link http://www.mechrise.com/auth/Blog

MECHRISE SOLUTIONS

MECHRISE SOLUTIONS

Bright future in Auto Industry For Mechanical Engineers.

Come "Make in India" a initiative by government of India is boosting the automobile industry to a greater extent along with the upcoming changes in regulatory policy, Innovation driven upgrades , demand for automatic transmission & supply of exports worldwide. Policy changes.  A fleeting, medium-term and long haul strategy guide will be helpful to design limits and adjust capital speculations. An unmistakable and stable strategy structure for the new advancements will offer certainty to the chief financial specialists in OEMs and part makers and furthermore direct GST tax collection.  Talking at SIAM's Annual Convention, Union Minister of Heavy Industries and Public Enterprises, Anant G Geete says government would before long turn out with the new auto arrangement. He clarified that any arrangement shouldn't be made in a rush and that all parts of the business would be talked about with the business and considered before settling the new auto approach. And more over BS VI while come into effect from 2020 to control the emission level from vehicles to have refined engines. Innovation Driven.  India’s competitive weakness is in design and product components in the auto sector. The sector is working on advancement of manufacturing sector technology, upskilling and reskilling workers and employment. More has to be done for sustainability, safety, new value propositions, increased software components in car, in-depth alignment, working closely with supply chain, new technology and be future ready. With different stakeholders included, automakers are still in a fix about India's EV dream and have possessed the capacity to contribute and commit 100 for each penny towards electric versatility. Automakers like Mahindra and Tata Motors have begun to put intensely to create electric autos in India. The initial delicate that was granted to Tata Motors and Mahindra likewise observed Japanese automaker Nissan partaking in a government tender. The following period of versatility will acquire a few new innovations like EVs, hybrid electric vehicles and connected cars. Interest for Automatic Transmission.  Auto creators like Hyundai, Maruti, Tata, Renault, Mahindra, Toyota,Honda, Nissan, Skoda, Volkswagen, Ford officially developed their own AMT,AGS,CVT,DSG transmission framework.  India's Automobile giant Maruti Suzuki is focusing to offer an aggregate of more than 2 lakh autos with AGS this financial, in the wake of intersection three-lakh retail deals stamp inside five long stretches of presenting the innovation.  Hyundai Motor India Ltd (HMIL) is seeing a footing for its vehicles with AT. As per an organization official, the organization has sold 27,029 units of vehicles with AT out of an aggregate offers of 2,75,136 as on June-end representing 9.8 % of the aggregate deals.  Tata isn't a long ways behind with its AT vehicles in the market. Tata Motors trusts that five years down the line, each second auto sold in India could be an AMT.  Supply of Exports  Fiat Chrysler Automobiles ,Bajaj Auto, TVS Motor Company, Eicher Motors, Daimler, Volvo, have made India a creation base for making vehicles and exporting to the emerging markets of Africa, Latin America, Asia and Middle East, and also to the developed markets of Europe and Japan,Australia.     German business vehicle monster Daimler AG has made Make in India a stride further. Its subsidiary Daimler India Commercial Vehicle produces items under four distinct brands in India. Anyway just a single brand, Bharat Benz, is sold in India while three, Mercedes-Benz (trucks), Fuso and Freightliner, are exported to other countries.  Its great opportunity for the engineers to be aware & adapt with the recent auto updates, upgrades in the market to remain and contend in this IOT age. For more updates click on http://mechrise.com/auth/Blog

MECHRISE SOLUTIONS

MECHRISE SOLUTIONS

Manufacturing sector shall pave way to Engineers to beat the employability woes.

Msme sector is facing tremendous employability crunch in the manufacturing segment especially in mechanical engineering stream. Nowadays ITI, Diploma graduates are hard to find in manufacturing segment as they are working as delivery boys, drivers for the online driven start-ups.  Sales representative, storekeeper for various Shopping malls & FMG stores in metro cities, urban towns. The pay scale being the same & even more incentives, perks, additional benefits in par with manufacturing companies without much effort. Every year more than 1.5 Million graduate as engineers in India out of which 0.25 million engineers pass out as mechanical engineers, yet industries are unable to employ right candidates in their organisation due to lack of skills as an armoury to their profile. In the most recent decade immense number of colleges were added in India to give Engineering courses in which greater part of the diploma graduates were given a chance to join these colleges without paying gigantic fees as government gave expense repayment plan to numerous college under fee reimbursement scheme. Industries are looking for  ITI ,diploma candidates to  recruit ,but  today's statistics state  80% of the diploma graduates are engineers now. These engineers would be the right solution to fill in the opportunities available in the market after rigorous training with the required skills provided by either company or any other Skill development training providers. Almost 90% of engineering industry is falling short of employees in the Cnc segment as operators & programmers roles and are unable to run all the three shifts in full throttle. . Working in the industries will be a daunting task for the engineers as their hands need to get filthy, work in shifts & not less than 9 hours per day. Now its Msme sectors time to turn the tide to give an opportunity for the growing unemployed engineers in the market to beat the employment crunch to stay in the rat race and progress towards growth For more interesting updates Click the link http://www.mechrise.com/auth/Blog

MECHRISE SOLUTIONS

MECHRISE SOLUTIONS

Are our Mechanical Engineers ready for digital manufacturing?

In an ongoing review done by Mechrise in Telangana and Andhra states crosswise over Engineering Industries 95 % of the Directors, HR's, Production supervisors gripe numerous Mechanical engineers need specialized aptitudes and vision in their profession. Engineering Industries employment requirement is huge among the digital manufacturing graphics area like 3d Printing,CAM programming up to 5-Axis not only in india but also globally. Technology is evolving day by day where even there are Cnc centres which can manufacture up to 12Axis. To work as a CNC operator one doesn't required any high specialized abilities, however to program these machines one need no less than 8-12 months useful experience as an administrator to comprehend its usefulness and working highlights. Later on utilizing the working abilities one can upgrade as a CNC Programmer by learning different CAM Software's accessible in the market. Including with the programming abilities one who can demonstrate a part by giving end-end arrangement will be considered as a CNC Job setter who is paid Equivalent or higher than an IT representative of 5 years experience in the manufacturing Industry. Be that as it may, when coming to ground reality younger generation engineers are not in a situation to comprehend the significance of CNC which comprises of Milling, Turning, Mill-Turn, Turn-Mill, EDM, Laser cutting, Waterjet Cutting and numerous further developed advancements which will totally assume control over the traditional machining in a decade says Mr A. Jayan MD of NEC Pvt Ltd an industrialist. Growth and opportunities of CNC Job setter is high when contrasted with a CAD Designer of multi year's experience since India is a developing economy of Manufacturing with more work to come as a Make in India initiative with energetic blood close by and potential to development quickly. .There is dependably an extent of advancement yet the strategies and support from the legislature to approach and perceive how we will match with other innovation driven nations. For more information Click the link http://www.mechrise.com/auth/Blog

MECHRISE SOLUTIONS

MECHRISE SOLUTIONS

 

let all of us be active on Mechanical engineering forum

Smart hello to every one... As off late I got busy in some personal projects, this year we are back and look forward to make the community live, quick, vibrant and responsive. I recommend few points to give it a great push... Make sure to login every day on the website mechanical-engg.com Time to showcase your skills, start your blog, give response to others, appreciate the starters. Do not put ads or promote others links, website.... we are making it a clean community..once banned you will miss the long term opportunities. Ask researchers, professors, to write their learning and teachings  We will be starting  quizzes very soon...we will even invite professors who are willing to make some interesting/challenging quiz for us  We look forward to start job section soon - will need help from community members to give us information of various openings in your company.. help us to reach your HR. Help us to reach and connect each and every single mechanical engineering professional. I am listing down the following ways  Facebook - Connect with me directly on this profile  https://www.facebook.com/mechanical.engineering.website and add all your friends in the following group https://www.facebook.com/groups/4mechanicalengineers/ Whatsapp - we will be forming whatsaopp groups..  https://mechanical-engg.com/whatsapp-group/  These groups will be just to send you the updates on phone .. do not join more then one group as same information will be shared on each group...

saurabhjain

saurabhjain

 

Warman Slurry Pump

Tobee® TH Slurry pumps are interchangeable with world’s standard Warman AH slurry pumps for heavy duties, A wide variety of impellers and shaft seals provide a perfect fit for a wide range of applications. The TH slurry pump provides excellent wear life while maintaining efficiency during the wear cycle providing the best total operating cost. These horizontal slurry pumps are designed for hyper heavy duty applications such as mill discharge, process plant, coal washing, dregding sands, tailings and high pressure pipelines, as well as other specialty applications. SPECIFICATIONS: Size: 1" to 22"
Capacity: 3.6-5400m3/h
Head: 6-125m
Handing solids: 0-130mm
Max.pressure: 2020 kPa
Materials: Hyper chrome alloy, Rubber, Polyurethane, Ceramic, Stainless steel etc. Design Features: • Bearing assembly - a large diameter shaft with short overhang minimizes deflection and contributes to long bearing life. Only four through bolts are required to hold the cartridge type housing in the frame.
• Liners - easily replaceable liners are bolted, not glued, to the casing for positive attachment and east of maintenance. Hard metal liners are completely interchangeable with pressure moulded elastomer.
• Elastomer seal rings back all liner joints.
• Casing - Casing halves of cast or ductile iron with external reinforcing ribs provide high operating pressure capabilities and an extra measure of safety.
• Impeller - front and rear shrouds have pump out vanes that reduce recirculation and seal contamination. Hard metal and moulded elastomer impellers are completely interchangeable.
• Cast in impeller threads require no inserts or nuts. High efficiency and high head designs are also available.
• Throatbush - wear is reduced and maintenance simplified by the use of tapered mating faces to allow positive accurate alignment during assembly and simple removal.
• One-piece frame - a very robust one-piece frame cradles the cartridge type bearing and shaft assembly.
• An external impeller adjustment mechanism is provided below the bearing housing for easy adjustment of impeller clearance. HEBEI TOBEE PUMP CO.,LIMITED
Add:Hi-tech Development Zone | Shijiazhuang City | Hebei Province | China.
Email:Sales@tobeepump.com | Skype:Tobee.pump | Mob:+86-18032034573 | Web:www.tobeepump.com

Tobee Pump

Tobee Pump

 

Horizontal Slurry Pump

Tobee® TH Slurry Pumps are the most comprehensive range of centrifugal slurry pumps for use in mining, minerals processing, coal preparation, dredging, metallurgy, power plant, chemical and general industry applications. The wetted parts materials designed by High abrasion and corrosion resistance alloy, rubber or polyurethane etc, Expecially for handling highly abrasive,high density slurries. Design Features:
• Horizontal,Cantilevered,Centrifugal,Single stage slurry pump design.
• Bearing assembly - A large diameter shaft with short overhang minimizes deflection and contributes to long bearing life. Only four through bolts are required to hold the cartridge type housing in the frame.
• Casing - Casing halves of cast or ductile iron with external reinforcing ribs provide high operating pressure capabilities and an extra measure of safety.
• Impeller - Front and rear shrouds have pump out vanes that reduce recirculation and seal contamination. Hard metal and moulded elastomer impellers are completely interchangeable.
• Liners - Easily replaceable liners are bolted, not glued, to the casing for positive attachment and east of maintenance. Hard metal liners are completely interchangeable with pressure moulded elastomer
• Throatbush - Wear is reduced and maintenance simplified by the use of tapered mating faces to allow positive accurate alignment during assembly and simple removal.
• Shaft seal - Packing seal,Centrifugal seal,Mechanical seal;
• Driving type - Flexible coupling,V-belt with pulleys,Gearbox,VFD,SCR control etc.
• The discharge branch can be oriented to any eight positions at the interval of 45 degrees;
• Easy to install and maintain in on-site application. Typical: Mining & Mineral Processing
The slow running speeds of the Tobee TH Heavy Duty Slurry Pump, together with the comprehensive choice of abrasion resistant alloys and elastomers, provide unrivalled performance and service life for all abrasive mining and minerals processing applications. Chemical Process
The interchangeability of alloy and elastomer components in the same pump casing, together with a wide range of mechanical seals, make the Tobee TH Heavy Duty Slurry Pump the most flexible choice for the chemical plant environment. Sand & Gravel
Designed for easy and simple strip down and re-assembly, the Tobee TH Heavy Duty Slurry Pump minimises downtime, making it the ideal choice where installed stand by pumps are not available. Sugar Processing
The premium reliability and service life of the Tobee TH Heavy Duty Slurry Pump is specified by many sugar plant engineers worldwide where uninterrupted pump operation during the sugar campaign is a critical requirement. Flue Gas Desulphurisation
The new generation of specially formulated abrasion and corrosion resistant alloys, together with the very latest elastomer technology, positions Tobee Pumps firmly as a major supplier of pumps to the FGD industry. Oil & Gas Exploration
Over a number of years we have developed the proven design of the Tobee TH Heavy Duty Slurry Pump ranges to suit the specific demands of offshore applications. We can now offer the most reliable top side solution to erosive wear. Industrial Applications
Wherever abrasive solids are causing premature failure of pumps, the Tobee TH Heavy Duty Slurry Pump range has the right combination of performance, wear life and reliability to bring the customer the lowest cost of ownership. HEBEI TOBEE PUMP CO.,LIMITED
Add:Hi-tech Development Zone | Shijiazhuang City | Hebei Province | China.
Email:Sales@tobeepump.com | Skype:Tobee.pump | Mob:+86-18032034573 | Web:www.tobeepump.com

Tobee Pump

Tobee Pump

 

Vertical Slurry Pump

Tobee® TP(R) Vertical slurry pump is a cantilever sump pump,Which work submerged to transport high abrasive and high density slurries with large particles.It doesn't need any seal water. Hard metal lined or fully rubber lined fitted.High capacity double suction semi-open impeller design.and suction agitator is also available.
Design features:
1.Vertical,Submerged,Cantilevered shaft sump slurry pump 2.Bearing Assembly - The bearings, shaft and housing are generously proportioned to avoid problems associated with the operation of cantilevered shafts in the first critical speed zones. 3..Column Assembly - Completely fabricated from antiwear carbon steel. The TPR model is rubber covered. 4.Shaft - Different length of the pump drive shaft or suction extension pipe could be selected 5.Casing - TP(R) has a simple bolt-on attachment to the base of the column. It is manufactured from a wear resistant alloy for the TP pump series and from moulded Rubber for the TPR pump series. 6.Impeller - Double suction semi-open impeller design, Wear resistant alloys, polyurethane and moulded elastomer impellers are interchangeable. 7.Upper Strainer - Drop-in metal mesh; snap-on elastomer or polyurethane for TP and TPR pumps. Strainers fit in column openings. 8.Lower Strainer - Bolted metal or polyurethane for TP pumps; moulded snap-on elastomer for TPR pumps. 9.Discharge Pipe - Metal for TP pumps; Rubber covered for TPR pumps. All wetted metal parts are completely rust protected 10..Agitator option keeps solids in suspension,Alternatively, a mechanical agitator is fitted to an extended shaft protruding from the impeller eye. 11.Don’t need any seal and seal water. HEBEI TOBEE PUMP CO.,LIMITED
Add:Hi-tech Development Zone | Shijiazhuang City | Hebei Province | China.
Email:Sales@tobeepump.com | Skype:Tobee.pump | Mob:+86-18032034573 | Web:www.tobeepump.com

Tobee Pump

Tobee Pump

 

Gravel Sand Pump

Tobee® TG Gravel Sand Pump is horizontal single-casing gravel pump with wide channel to transfer sands,slurries or gravels with big particle size. The wet parts are made of Ni-hard and high-Chrome alloys to ensure long service life. It has superior performance than common pumps in dredging, sand mining, barge loading and mineral processing etc. With all the advantages of TG Gravel pump,TGH gravel pump has achieved extra high head for special working conditions. Design Features: • Horizontal,Cantilevered, Single casing, Centrifugal Gravel sand pump.
• The wetted parts are made of Ni-hard and Ultrahigh-chrome alloys with super strong abrasion resistance.
• The discharge direction of pump can be oriented in any angle of 360°.
• Packing seal, Expeller seal and Mechanical seal are available as per different application.
• Excellent NPSH performance.
• Simple and reliable construction, Easy to disassembly, assembly and maintain. HEBEI TOBEE PUMP CO.,LIMITED
Add:Hi-tech Development Zone | Shijiazhuang City | Hebei Province | China.
Email:Sales@tobeepump.com | Skype:Tobee.pump | Mob:+86-18032034573 | Web:www.tobeepump.com

Tobee Pump

Tobee Pump

 

Common Thermoplastics Used in Today's Plastic Injection Moulding

Acrylonitrile Butadiene Styrene  Acrylonitrile Butadiene Styrene (ABS), it is a dark thermoplastic and amorphous polymer. It is a terpolymer (copolymer comprising of three unmistakable monomers) of Acrylonitrile, Butadiene, and Styrene. Together they make an item that is adaptable and light in weight that can be shaped into numerous things that we use in our regular day to day existences.  The benefit of ABS is that an assortment of changes can be had to enhance impact protection, sturdiness, and heat protection. Molding at a high temperature enhances the gleam and heat protection of the item while molding at a low temperature is where the highest impact resistance and strength are obtained. Polyethylene  Polyethylene is a thermoplastic polymer with variable crystalline structure and a huge scope of uses relying upon the type. It is a standout amongst the most adaptable and most famous plastics on the planet since the 1950s when it was produced by German and Italian researchers. The two most regular kinds of this plastic are high-thickness polyethylene (HDPE) and low-thickness polyethylene (LDPE).  The upsides of polyethylene are abnormal amounts of pliability, rigidity, impact protection, protection from dampness, and recyclability. The higher the thickness of the polyethylene material utilized the more grounded, more unbending, and more heat safe the plastic is. The essential employments of polyethylene are plastic sacks, plastic films, compartments including bottles, and geomembranes. Polyamide (Nylon)  Nylon material is utilized as a part of a vast scope of various applications in view of its electrical properties, sturdiness, wear protection and chemical protection being very noteworthy. Nylon has an abnormal state of strength and is impervious to numerous outer components like scratches, impact, and chemicals. This material produces plastic parts utilized as a part of numerous businesses, for example,  Medicinal items  Car items  Games hardware  Attire and footwear  Industrial components   High Impact Polystyrene  High Impact Polystyrene (HIPS) is a prevalent and intense plastic that is in the Polystyrene family. Polystyrene is weak and can be more impact safe if joined with different materials. It is made from modifying crystal styrene with rubber which helps to give it many levels of impact resistance. It is low cost, has good dimensional stability and rigidity. There are FDA grades available since it is non-toxic and used as containers for many food goods.  It is exceptionally flammable, yet there are fire resistant and polished evaluations that are generally utilized for injection molding.  Polypropylene  This is an extremely regular plastic that is known for its adaptability. PP (polypropylene) is an exceptionally unique plastic and has been intensified for an extensive variety of properties. A few attributes of this plastic are its high liquefying point, high protection toward stress and splitting, magnificent impact quality, and does not break down from responses with water, acids, and cleansers.  PP is ok for use as food holders since it doesn’t filter chemicals into nourishment items. It can be generally found in family unit merchandise, for example, utensils, athletic clothing, area rugs, and car parts, for example, auto batteries.  

Rishabh Pandey

Rishabh Pandey

10 lý do khiến chiếc xe của bạn bị rung lắc

Điều gì khiến cho chiếc xe của bạn bị rung lắc? Có thể đang có nhiều vấn đề và nguyên nhân gây ra. Nguyên nhân về kỹ thuật xe là điều phải đặc biệt chú ý. Sử dụng một chiếc ô tô lâu dài, chắc chắn điều không tránh khỏi là các vấn đề kỹ thuật của xe ngày càng đi xuống. Một trong những vấn đề xảy ra là sự rung lắc xe khi chuyển động. Điều này làm bạn khó chịu khi ngồi trên xe. Hơn thế nữa, nó còn ảnh hưởng đến các tính năng an toàn, dẫn hướng trên xe. Vậy nguyên nhân nào dẫn đến sự rung lắc này? Bạn sẽ tự hỏi rằng tại sao xe mình lại rung như vậy? Nguyên nhân do đâu? Tiếp tục đi có bị ảnh hưởng gì không? Nếu bạn không phải là người chuyên môn kỹ thuật ô tô, bạn khó có thể biết được nguyên nhân là gì? Thật sự là một lợi thế nếu bạn có thể phán đoán được nguyên nhân gây ra sự rung lắc này. Nó giúp bạn biết được vì sao, bộ phận hay chi tiết nào hỏng, cần khắc phục chỗ nào… Điều này sẽ giúp bạn nắm được chi phí của việc sửa chữa… Dưới đây là tổng hợp 10 nguyên nhân chính thường gây ra sự rung lắc ô tô. 1Lốp xe bị hỏng   Lốp xe bị cũ, khô, phồng rộp, mòn là nguyên nhân gây xe bị rung lắc quá mức khi chuyển động. Bởi vì lốp xe là bộ phận duy nhất tiếp xúc, liên kết chiếc xe của bạn với đường, nó lại làm việc trong những điều kiện vô cùng khắc nghiệt nên tuổi thọ của lốp xe là tương đối ngắn.

Dưới đây là các vấn đề chính mà lốp gặp phải gây ra rung lắc cho xe: + Lốp xe bị nứt, tách - yêu cầu phải thay lốp   + Bề mặt lốp bị mòn không đều (vẫn còn đảm bảo tiêu chuẩn) - yêu cầu đảo lốp, xoay lốp + Lốp xe đã bị méo (out of round), không còn cuộn đều - yêu cầu thay lốp + Áp suất lốp quá thấp - bơm thêm cho lốp + Lốp quá cũ - thay lốp
  2Lốp Profile thấp hoặc lốp cản lăn thấp   Lốp cản lăn thấp hay còn được gọi là lốp profile thấp, đang ngày càng trở nên phổ biến với sự gia tăng xe hybrid và EVs. Những lốp xe này làm giảm lực cản, với mục đích làm tăng sự tiết kiệm nhiên liệu EPA, là một biện pháp quan trọng của các loại xe này, đặc biệt cho mục đích marketing. Tuy nhiên những lốp xe cản lăn/profile thấp thường không hấp thụ bề mặt đường tốt, do đó nó truyền va đập lên xe và hệ thống lái gây ra một sự rung lắc và ảnh hướng đến cảm giác lái. Nhiều người thích loại lốp này vì nhìn nó đẳng cấp, thể thao. Tuy nhiên nó lại không thực sự tốt nếu xe của bạn không được thiết kế để lắp loại lốp này. Đây chỉ là một nguyên nhân gây ra sự rung lắc xe. Bởi nó liên quan đến thiết kế xe. Tuy nhiên bạn có thể khắc phục bằng cách thay loại lốp và la răng (không khuyến cáo). Khuyên bạn nên khắc phục các vấn đề khác. 3La răng bị méo hoặc hư hỏng nặng   Các nguyên nhân như đường ổ gà, bị va chạm gây ra sự hư hỏng la răng, khiến chiếc la răng của bạn bị méo, nứt,... Nếu một hoặc các bánh xe bị hỏng, méo la răng, nó sẽ khiến bánh xe bị mất cân bằng khi quay, sự mất cân bằng này tác động lên xe gây ra sự rung lắc. Trầm trọng hơn, nó còn gây ra sự mất kiểm soát dẫn hướng, gây mất an toàn... Trường hợp bị hỏng nặng thì bạn có thể nhận thấy bằng mắt. Nhưng với những trường hợp không thể quan sát, bạn cần sự hỗ trợ kiểm tra của kỹ thuật viên bằng cạch sử dụng máy chuyên dụng để đo sự rung lắc bánh xe. Khi la răng bị méo, nứt hỏng nặng, khuyên bạn nên thay thế bánh xe mới. 4La răng/Bánh xe không cân bằng   Việc bánh xe hoặc la răng không cân bằng gây ra sự mất ổn định khi quay, nó gây ra các mô men và các lực ly tâm không cân bằng, khiến cho bánh xe bị lắc, mất ổn định, tác động lên thân xe gây ra rung lắc xe. Việc cân bằng bánh xe tốt nhất phải có trang thiết bị và máy tính kiểm tra để đo các khối lượng cân bằng. Chắc hẳn bạn đã thấy các mẩu kim loại nhỏ gắn vào la răng, đó chính là các mảnh khối lượng cân bằng gắn vào. Việc bánh xe hoặc la răng không cân bằng là một nguyên nhân phổ biến gây ra sự rung lắc bánh xe. Tuy nhiên bạn không thể tự mình kiểm tra được, mà phải cần đến sự trợ giúp của các gara có trang thiết bị đo. Giá cả của việc kiểm tra này cũng không đắt đâu, nên bạn yên tâm đem xe đến các đại lý 3S hoặc 5S để kiểm tra nhé. 5Nguyên nhân do hệ thống lái/Trợ lực lái   Nếu chiếc xe của bạn chỉ bị rung lắc, hay cảm giác rung lắc trên tay bạn khi mà bạn đánh lái thì chắc chắn nguyên nhân từ hệ thống lái,: các chi tiết liên kết bị nỏng, rơ, trợ lực lái có vấn đề. Có thể là bị dò dỉ dầu trợ lực, bơm hỏng, hay các thanh răng, các thanh rằng bị cong, các khớp nối quá rơ rão,... Do vậy, khi bạn đánh lái mà cảm thấy rung lắc ngay cả trên mặt đường bằng phẳng, thì tốt nhất bạn hãy đánh xe đến gara và yêu cầu kiểm tra hệ thống lái. 6Trục quay và Cầu xe có vấn đề   Xe của bạn chạy trên đường, băng qua các vật cản có thể gây ra hư hỏng các trục và cầu xe. Dẫn đến trục các đăng, cầu xe, các bán trục có thể bị cong, các khớp nối bị méo nứt... Vì nó truyền chuyển động, truyền lực từ động cơ đến bánh xe, cho nên nguyên nhân gây ra khiến trục mất cân bằng khi quay, tạo sự dao động dẫn đến rung lắc xe. Kể cả các trục bánh chủ động hay bị động bị hư hại đều gây ra sự rung lắc này. 7Hệ thống phanh có vấn đề   Nếu hiện tượng rung lắc xe xảy ra khi bạn đạp phanh, khả năng lớn là nguyên nhân gây ra ở hệ thống phanh. Có thể đĩa phanh hoặc trống phanh bị cong, nứt, méo... hoặc có sự mắc kẹt ở má phanh. Hay má phanh đã bị mòn hết, khi phanh các tấm kim loại ép nhau, vì nó không phẳng nên gây ra rung lắc. 8Các điểm liên kết của động cơ có vấn đề   Các cụm liên kết giữa động cơ với khung xe, với giá đỡ được cấu tạo từ kim loại và cao su. Nếu các cụm kết nối này bị vỡ, hỏng, nó sẽ làm mất tính năng đàn hồi cần thiết, mất liên kết giữa động cơ và thân xe. Do dó nó gây ra sự rung lắc rất mạnh. Hãy nhanh chóng đưa xe đến gara để sửa chữa và thay thế các cụm kết nối này để tránh làm hư hại đến động cơ và giá đỡ, thân xe. 9Động cơ có vấn đề   Nếu sự rung lắc mạnh phát ra từ động cơ thì chắc chắn chiếc động cơ trên xe của bạn đang gặp vấn đề kỹ thuật cần khắc phục kịp thời. Các nguyên nhân khiến động cơ rưng lắc rất nhiều: một hoặc vài xy lanh bị mất lửa; hệ thống nạp bị tắc hay cảm biến hỏng; nguyên nhân từ trục khuỷu, thanh truyền có thể bị cong,... Để cảm nhận được rung khi xe đang chạy, bạn cần có kinh nghiệm lái xe: khi bạn tăng tốc, chiếc xe có cảm giác như co giật, rùng mình; xe chạy một lát sau đó bắt đầu rung lắc,... Khi bạn nhận thấy sự rung lắc xe là từ động cơ, hãy đưa xe đi sửa chữa ngay, nếu nhẹ, bạn chỉ phải thay một vài cái buji, hay bộ lọc khí. 10Hệ thống treo có vấn đề   Hệ thống treo là liên kết duy nhất từ bánh xe lên thân xe. Nó là một hệ thống có chức năng kết nối xe thân xe với truyền động, và là tiện nghi. Khi hệ thống treo bị trục trặc: gãy nhíp, gãy lò xo, hỏng lớp đệm, giảm trấn bị hỏng,... nó sẽ không thể hấp thu được các rung động từ mặt đường nữa, và bản thân sự hư hại này cũng trực tiếp gây ra tác động đến thân xe khiến cho chiếc xe của bạn bị rung lắc mạnh. Trên đây là các nguyên nhân chính gây ra sự rung lắc xe của bạn. Khi xe của bạn trở nên rung lắc, khuyên bạn hãy đưa xe đến các trung tâm dịch vụ để kiểm tra và khắc phục kịp thời.

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