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<h1><a > Molding and Casting</a></h1>
<span>Assignment 16</span>
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<h4 id="16-Week Task" > <strong>Week Task</strong> </h4>
<p><strong> group assignment:review the safety data sheets for each of your molding and casting materials,
then make and compare test casts with each of them <br>
individual assignment: design a mold around the stock and tooling that you'll be using, mill it (rough cut + (at least) three-axis finish cut),
and use it to cast parts </strong> </p>
<h4 id="introduction" > <strong> Introduction</strong> </h4>
<p><strong> Pattern is the principal tool during the casting process. It may be defined as a model of anything, so constructed that it may be
used for forming an impression called <i>mould </i> in damp sand or other suitable material. When this mould is filled with molten metal, and the metal is allowed to solidify, it forms
a reproduction of the pattern and is known as casting. The process of making a pattern is known as pattern making.<br>
The casting have five stages: (1)pattern making (2) moulding and coremaking (3) melting and casting (4) fettling and (5) testing and inspection. <br> </strong> </p>
<h4 id="material"> <strong> Pattern Material</strong> </h4>
<p><strong>Following are the some basic pattern material available in market <br>
1. Wood <br> 2. Metal (CI, Brass, Al, White metal ) <br> 3.Plastics <br> 4. Rubbers <br> 5. Plasters <br> 6. Waxes </strong> </p>
<h4 id="types"> <strong> Types of Patterns</strong> </h4>
<p><strong>Following are the some basic pattern material available in market <br>
1. Single-piece Patteran <br> 2. Split Pattern <br> 3. Match plate Pattern <br> 4. Cope and drag Pattern <br> 5. Gated Pattern <br> 6. Loose-piece Pattern <br> 7. Sweep Pattern <br>
8. Skeleton Pattern <br>9. Segmental Pattern <br> 10. Shell Pattern <br>11. Built-up Pattern <br> 12. Boxed-up Pattern <br> 13. Lagged-up Pattern <br> 14. Left and right hand pattern </strong> </p>
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<h4 id="allowance" > <strong>Pattern Making Allowances</strong> </h4>
<p><strong>Pattern are not made the exact same size as the desired casting for several reasons. Such a pattern would produce castings which are undersize, allowance must therefore be allowed for shrinkage, draft, finish, distortion and rapping.
Following are the allowance need to consider during patterna making <br>
1. Shrinkage Allowance <br> </strong> </p>
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<p><strong> 2. Draft Allowance <br></strong> </p>
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<p><strong> 3. Distortion or camber Allowance <br></strong> </p>
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<p><strong> 4. Rapping Allowance </strong> </p>
<h4 id="difference" > <strong>Difference between 3D printing and molding</strong> </h4>
<p><strong>3D printing is an additive process. It manufactures objects by building them up layer by layer. We can watch this build process as it happens, which is useful when we’re testing a new design. <br> </strong> </p>
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<p><strong> Injection molding makes use of molds. First, an object’s inverse is carved out of a material that is safe to handle the molten build material (the material the finished object is made of. Then, the molten build material is poured into the mold.
Once the material has cooled in the mold, the finished object is ready. <br> </strong> </p>
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<p><strong> Another difference in them is the way of material is put into the machines, in injection moulding small piece of plastic called “Pellets” are used while in 3D printing “filament” is used. </strong> </p>
<h4 id="individual" > <strong>Individual Assignment</strong> </h4>
<p><strong> The task for the week is to design a mold around the stock and tooling that we are using, mill it (rough cut + (at least) three-axis finish cut), and use it to cast parts </strong> </p>
<h4 id="What i learn" style="border-bottom: 6px solid yellow; background-color: lightgrey" > <strong> What i learn? </strong> </h4>
<p style="justify-content: center"><strong> I am learn about <br>
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<p> Go to the <a href="#16-week task">top</a></p>
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<li class="first"><span class="fa fa-check"></span><a href="#16-Week Task">Week Task</a> </li> <br>
<li><span class="fa fa-check"></span><a href="#introduction"> Introduction</a> </li><br>
<li><span class="fa fa-check"></span><a href="#material"> Pattern Material</a> </li><br>
<li><span class="fa fa-check"></span><a href="#types"> Types of Patterns </a> </li><br>
<li><span class="fa fa-check"></span><a href="#allowance"> Pattern Making Allowances </a> </li><br>
<li><span class="fa fa-check"></span><a href="#difference"> Difference between 3D printing and molding </a> </li><br>
<li><span class="fa fa-check"></span><a href="#individual">Individual Assignment</a> </li><br>
<li><span class="fa fa-check"></span><a href="#What i learn"> What I learn?</a> </li><br>
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<h2> <a href="assignment15.html">Assignment 16: Molding and Casting</a></h2>
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<p>Write about assignment 16.</p>
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