Question

a - Describe the rapid prototyping technologies under the liquid base starting materials and state the differences between these technologies??

b- There are many reasons for coating, discuss these reasons showing the need of coating in each ????

c- There are many reasons for mechanical work-part cleaning, discuss the reasons for work-part cleaning showing the need of work-part cleaning in each of these reason ???

Answer 1

CAD model into STL file formato the model is constructed layer by lager. Rapid poototyping is quite a recent technology in the field of manufacturing Rapid prototyping is nothing but a physical model that is automatically Constructed loyed by loyer. Rapid poototyping is a kind of additive manufacturing proces which is used for automatically constructing the 3D physical model with the help of a virtual 3D CAD (Computer Aided Design) model data using outomated machines. + Ropid prototyping prototyping involves many many stages starts with creating the 3D model of the design and then converting this it into stl (Stere After converting lithography) formot, slicing of the sth file is done into this dayers - Finally At dont , cleaning and past proconing is done.

There are many types of Ropid prototyping techniques boreal on the storting material such as solid-based and Liquid -based powded. Based Liquid - Based Rapid Prototyping Systems → Starting material is a liquid mostly resing and porymers + About A dozen Rapia foototyping technologies are in this category 7 Jt in cludes the following procemes Stereolithography Solid ground Curing goopper Deposition Manufacturing • STEREO-LITHOGRAPHY (SLA) Works based on the principle of Curing liquid photomes into specific shape. * A Vat which can be lowered and raised filled with photo curable liquiet acrylate polymer .

Loser generating urv beam is focuseo, in qoy directions The beam cures the portion of photo polymer and produces a solid body * This process is repeated till the love is reached as shown in figure Now the plot form is lowered by distance ob Then another portion of the Cylinder is shaped till the portion is reached. Focusing System Rolating Mirror Не- cd honer oo High-stepped Motors (UV-beam Liquid Resin Isle-cd Cerer Part Support Structure Plotform Elevation control

ed + 500 to 2500 ► 0.01-0.2 (SCA) Starting materials are Liquid monomers polymerization occurs on exposure to ur hight produced by Laser scanning beam Sconnig speed 500 mm/s A ccuracy (mm) • Solid Ground Curing (SG ŷ tid on additive manufacturing method in which liquid plastic is solidified by UV light, the entire area of the current layer is procemed in one prep SGC Wooks by Cusing a photo- sensitive polymer dages by loyer to creare A solid model based on CAD geometric dota instead of using a scanning laser beam to care a given loger, a given dager, the entire exposed to a through a mark above the dignia U V source loyer is polymer & Hordening takes 2 to 3s for each layer.

Facts about s GC sequence for eack lager takes about go seconds The solid Cubic foam created in SGC consist of the solid polymer is based on a cron-section of A CAD geometric model that is sliced into and Wax. → The Wax provides support for fragile and over Ronging features of the port oluring fabrication But can be melted owny loyer to leave the former stondling fast Droblet Deposition Manufacturing (DPM) Starting material is melted and small dooplety one shot by a nozze onto previously formed loyer Sooppet cold weld to surface to from a new doyer Deposition for eack loyer controlled A moving X-y nozzle whose pork by layers.

vore opbourance, ad Region, Wettability, Contorion In some processes i deposited dooplot Cured by uv light to harden Work materials include Wax and thermoplastic b) Conting are intended to stop Corrosion by maintaining the port from exposure to oxygen and Woleo. * The Common factors behind corrosion on industrial machines are highly Rumid environment industrial fumes, liquid, solids, goles etc. A well cooted machine or machine component is protected against these factors Conting is the process in which some sort of liquid should be covered in a specific area to protect * The Cooting is a covering that is applied to tie surface of an object, usually referred to as the substrate . In mony coses, coatings are applied to improne surface pooperties of the substrate, such as resistoncio, Weor resistance and acroti retifonce

need to Here are a few Reason it 9) jt poovide protection - In many Cases, there is a great protect the item that is being conteol. In any kind of Industrial conting envidonment heavy wearis definitely so by applying on Industrial casting, you con poote of various surfaces ond heep them retain their hardness, sheen or any other property you Wont them to retain for a longer an issue, They provide . period of time. Safety : Sometimes you may need to moice o surface non-stiß of non-sticke Cooting is necessary to prevent from slipping especially in areas where there is a lot of liquid that could doop onto the floor. Industring Coatings are the best way to keep o variety of surfaces Safe

opplications solution is to have an industrial the material the machine is made from e) They prevent Corrosion Quat or other corrosive debris u another issue that often pops up in Industrial often the mo a tesines that ore hard enough to actually build machinery from are also very likely over time. The only because of to corrode Cooting applied because it combe engineered to provide the perfect connection between mochine on a the material it is processings. It also poevent stondord corrosion better that may occur simpty od) They keep surface Clean By engineering engineering a Cooting that will speci fic Ally resist whorever you ore processing you will enjoy spooner surface because the materials will flow right through the machine g

e) Worko por it cleaning is on essential to many industrial processes cleaning to poo tect sensitive component. Mec echanical is the use of sond paper or other abrasives to cleon sother than Chemical solvent There are five key factors involved when cleaning that are equiereg in pootant :- time, temperature, oction, Chemical action, and proce rocedures dures. Bolancing these factors will produce the best bossible results mechanical

decreased and reached the maximum > ୪ ୧ • Reason for Mechanicae Work-port cleaning Automotive parts cleaning hos always been a complex poores requising special treatment and proceming for component like engine blocks, bookes and clutch parts. In most plants, the cleaning Agents are croculared until their creoning power has eventually tolerohlo contoinnient levels preno vent infections Dioty environ ment con harbor nosty bacteria which con lead to illness, so it is exental that creondiness is maintineda feoning equipment rhos patent c Remicons to Kill microscopic organism that are infectious In cremde Workplace booductivity son addition to im pooving Worlc-proce

environment, they will not contaminare productivity i regular cleaning ang maintenance of your industrial tools and equipment con improve production efficiency by keeping machine in proper Wooking Condition Economical and Cleaning equipment replaces the cleaning tosic force that is required to do the work manually they are Also built in such a way that they consume little amount of energy which is reconomical when it comes to the Eco-friendly its esential