disadvantage of using plastic as pattern materials

Investment casting - WikipediaInvestment casting is an industrial process based on lost-wax casting, one of the oldest known metal-forming techniques. The term "lost-wax casting" can also refer to modern investment casting processes. Investment casting has been used in various forms for the last 5,000 years. In its earliest forms, beeswax was used to form patterns necessary for the casting process. Today, more advanced waxes, refractory materials and specialist alloys are typically used for making patterns.

Pattern and Their Types - Industrial Engineering Manufacturing ...pattern material: Normally the pattern materials are metals, wood and plastics. Most commonly used pattern material is wood. There is a disadvantage of using the wood, as we can observe the absorption of moisture in the wood. The absorption of the moister results to distortion and change of dimensions are seen. The selection material depends upon the. Size of the casting; No of castings performed on the pattern; Dimensional accuracy should be required. For large casting mainly ...

Advantages and Disadvantages of Casting Pattern TypesFair wearing properties. With care, will remain reasonably accurate over fairly long periods. Not suitable for high-volume production. plastic, Inexpensive to produce. Urethane technology provides good wearing properties and accuracy. Easily modified depending upon the materials used. Suitable for high-volume production patterns with the same dimensional tolerances as metal patterns. Urethane technology has reduced many of the disadvantages of early plastic pattern materials.

Plastic Vs. Metal Fabrication - Advantages and Disadvantagesplastic Extruder Though the results of plastic fabrication greatly depend on the unique characteristics of the type of plastic used (acrylic, Plexiglas, nylon, etc.), the process itself has several advantages, which include: Ease of forming: Due to its low melting point and high malleability compared to other materials, plastic can be formed into basic and complex geometries with relative ease. Reduced finishing: Unlike most metals, plastics can be colored prior to fabrication, eliminating ...

Sand casting - WikipediaSand casting, also known as sand molded casting, is a metal casting process characterized by using sand as the mold material. The term "sand casting" can also refer to an object produced via the sand casting process. Sand castings are produced in specialized factories called foundries. Over 70% of all metal castings are produce

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