Spe- cially prepared resin-coated sands are also used. The hydraulic leak test is used to detect microscopic shrink- age porosity. Distribute the masses of a section to save material. The production volume ranges from 10,000 to 20,000 parts, and the machines employed are flexible and multipurpose. For instance, welding processes can be classified according to the source of energy required to accomplish welding. In such a case, it is obvious that there are four main groups: mechanical, electrical, chemical, or optical. Semicentrifugal casting is quite similar to the preceding type, the difference being that the mold cavity is completely filled with the molten metal.
Documentation In the fifth and last stage of the design process, the designer organizes the material ob- tained in the previous stage and puts it in shape for presentation to his or her superiors. Bulk forming operations are covered in Chapter 5, and the working of sheet metal is covered in Chapter 6. 2. Obtaining the required shape by adding metal or joining two metallic parts to- gether, as in welding, brazing, or metal deposition. Use can also be made of chills to promote direc- tional solidification. Also, the personnel employed must be highly skilled in order to handle a variety of tasks that differ for the different parts that are manufactured.
The nut size is 5/8 inch (15 mm), and the required torque is about 1.0 lb ft (1.356 Nm). Assume production volume is 10,000 pieces. 9. A straight-toothed spur-gear wheel transmits 1200 lb ft (1627 Nm) of torque to a steel shaft that is 2 inches (50 mm) in diameter. Carbon Dioxide Process for Molding Silica sand is mixed with a binder involving a solution of sodium silicate (water glass) amounting to 6 percent. They include high pro- duction rates (especially when multicavity dies are used), improved productivity, su- perior surface finish, very close tolerances, and the ability to produce intricate shapes with thin walls. Malleable cast iron is obtained by two-stage heat treatment of white cast iron having an appropriate chemical composition. Because the same equipment used in welding is also sometimes em- ployed in the cutting of plates, thermal cutting processes will also be discussed in this chapter.