Summary of Casting Processes, Their Advantages and Limitations[铸造工艺，其优点和局限性摘要](PPT-36).pptVIP

CHAPTER 11 Metal-Casting Processes Summary of Casting Processes Die-Casting Examples General Characteristics of Casting Processes Casting Examples Sand Mold Features Steps in Sand Casting Pattern Material Characteristics Patterns for Sand Casting Examples of Sand Cores and Chaplets Squeeze Heads Vertical Flaskless Molding Sequence of Operations for Sand Casting Sequence of Operations for Sand Casting (cont.) Surface Roughness for Various Metalworking Processes Dump-Box Technique Composite Molds Expendable Pattern Casting Ceramic Molds Investment Casting Investment Casting of a Rotor Investment and Conventionally Cast Rotors Vacuum-Casting Process Pressure Casting Hot- and Cold-Chamber Die-Casting Cold-Chamber Die-Casting Machine Hot-Chamber Die-Casting Machine Die-Casting Die Cavities Properties and Typical Applications of Common Die-Casting Alloys Centrifugal Casting Process Semicentrifugal Casting Squeeze-Casting Single Crystal Casting of Turbine Blades Single Crystal Casting Melt Spinning Types of Melting Furnaces Figure 11.29 Sequence of operations in the squeeze-casting process. This process combines the advantages of casting and forging. (c) Figure 11.30 Methods of casting turbine blades: (a) directional solidification; (b) method to produce a single-crystal blade; and (c) a single-crystal blade with the constriction portion still attached. Source: (a) and (b) B. H. Kear, Scientific American, October 1986; (c) Advanced Materials and Processes, October 1990, p. 29, ASM International. Figure 11.31 Two methods of crystal growing: (a) crystal pulling (Czochralski process) and (b) the floating-zone method. Crystal growing is especially important in the semiconductor industry. Source: L. H. Van Vlack, Materials for Engineering. Addison-Wesley Publishing Co., Inc., 1982. Figure 11.32 Schematic illustration of melt-spinning to produce thin strips of amorphous metal. Kalpakjian ? Schmid Manufacturing Engineering and Technology ? 2001 Prentice-Hall * (a) (b) Fi