In the lost foam process, the pattern doesn’t need to be removed from the mold. True or False
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In the lost foam process, the pattern doesn’t need to be removed from the mold.
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- The advantage of using an open mold is which one of the following: O higher production rates are possible smoother surfaces are achieved on both sides of the molding O the interior of the mold is accessible the mold costs much less than if two matching molds were usedWhy must parts not be moved as they cool through the paste range?2. State the function of the equipment belowa. Mold permeabilityb. Constant Head Test Toolc. Tamper
- In sand casting process, the pattern is made of metal wood plastic all of theseFor the process shown in the schematic below, which of the statements is/are incorrect? Feed hopper Feed hopper Plastic pellets Mold cavity Mold Nozzle Spreader Heating chamber Ram Hydraulic pressure Turning screw Barrel Heaters Shaping die Molten plastic Extrudate Select one or more: a. The process can only work with thermoplastics and not with thermosets due to the thermal processing requirements Tubing and pipes Sheet and film Structural parts b. The feedstock has to be molten or liquid monomer, the temperature of which will constantly be held above the melting temperature c. This process is best suited for the large volume production of tubes, bars and beams due to the nature of the extrusion process d. To release the part, the process typically involves the mould sections opening and the ejector pins pushing the object out of the mould De. The mould cavity region is usually temperature controlled so that at the point of injection it is heated and then gradually cooled down until…In the slump test, raise the mold in approximately ___________ seconds by a steady upward lift.
- For casting processes in metals, which of the following are true? (This question has more than one correct answer) a. May involve a multi-step casting process with an initial prototype used to shape the mould b. Can lead to internal defects in the metal c. Leads to formation of a solid part consisting of fused precursor particles d. Requires materials with high toughness to resist deformation e. Can only be used to form simple shapesAspiration effect filling and uniform ramming of sand in molds, O spiral mold test The action of raising and dropping (lowering) air is sucked in or entrapped in the liquid pressure is applied by a pneumatically operated piston allow escape of gases during pouring JoltingThe parting line in injection molding is which one of the following: O the lines formed where polymer melt meets after flowing around a core in the mold the narrow gate sections where the parts are separated from the runner where the clamping unit is joined to the injection unit in the molding machine O where the two mold halves come together