Titanium Part 4

Tham khảo tài liệu 'titanium part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 80 3 Technological Aspects determines the cost per piece that accrues from making the more complex and expensive dies used for closed die forging. A typical airframe or turbine engine forging is made in several steps. These steps are captured in a forging production plan that is approved by the customer before the first forging is produced. The first step is a potting or roughing operation that creates a work piece with the desired shape and aspect ratio for the first rough forging step often called the blocker. Potting is a simple upsetting operation of small diameter billet to create a somewhat larger diameter work piece. This is done in cases where small diameter billet is required to ensure adequate hot work has been done for reasons of microstructural control. In the case of highly irregular shapes the blocker is used to create nonuniform cross sections by gathering material where large local cross sections are required . the root and mid-span shroud regions of an aircraft engine fan blade. This is followed by several more rough forging steps and a finish forging operation to produce the final shape. The number of forging steps is determined by the size of the forging by the complexity of the final shape and by the workability of the alloy being forged. In all cases the work piece is reheated after each processing step. Most a p alloys such as Ti-6Al-4V are forged in the a P phase field but p processing is used in some cases where damage tolerant properties are the design limiting consideration. The effect of processing on properties is discussed in detail in Chap. 5. Fig. . Photo of a forging press 50 000 metric tons with a large aircraft bulkhead forging courtesy R. G. Broadwell Wyman Gordon Shaping into Components 81 Today the production plan for all forgings intended for high performance applications is created with the aid of computer modeling. This modeling addresses the strain strain rate and working temperature applied during each forging .

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