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McGraw-Hill Machining and Metalworking Handbook 3rd ed - R. Walsh_ D. Cormier (McGraw-Hill_ 2006) Episode 9

Tham khảo tài liệu 'mcgraw-hill machining and metalworking handbook 3rd ed - r. walsh_ d. cormier (mcgraw-hill_ 2006) episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Tooling Die Making Molds Jigs and Fixtures Tooling Die Making Molds Jigs and Fixtures 559 The basic die set consisting of top and bottom plates die shoe guideposts and guide bushings plus an optional top shank may be ordered in many different styles and sizes from suppliers such as Danly or Dieco and others. Photographs and illustrations of typical standard and special die sets are shown in other subsections. 8.3.3 EDM mold making ram EDM Molds that are machined from tool steels are presently being made using ram EDM machines. In this process the cavity of the mold is produced in a positive shape from a carbon-type material. This form or positive is then used in the ram EDM process to machine the cavity of the mold by the electric-discharge process. The ram or electrode positive form is placed under a cutting cooling fluid with the toolsteel mold block and is moved downward into the tool steel block as the electric-discharge cutting operation progresses. A hollow or cavity with the exact shape of the ram or electrode thus is produced to great accuracy with a fine surface finish on the tool-steel mold block. Molds or dies are produced with this method for manufacturing plastic parts injection or compression molding process as well as for die casting and powder-metal processing. Large amounts of material are machined accurately at a relatively rapid rate in the newer ram EDM process. When the mold cavities have been cut the die or mold maker must polish the mold and add gates ejectors and other requirements to complete the final mold assembly. The P-type special-purpose tool steels usually are selected for production of molds for plastic parts whereas other types of tool steels are selected for die-casting dies permanent steel molds and powder-metal dies. 8.3.4 Samples of dies drawings and stamped or blanked parts A typical high-quality die set is shown in Fig. 8.9. This is a heavyduty long-production-run type of stamping die for producing heavygauge cold-rolled .