1/4/2024 0 Comments Peregrin corporationHowever, beryllium is unique from a fracture mechanics point of view because of its sensitivity to twinning during manufacturing and the need to screen for flaws large enough to be a contributing factor to the end components quality. The relationship between flaw sizes, fracture toughness and maximum stress are well understood for beryllium and designs are produced accordingly. If high precision features are required thereafter, critical final lapping/grinding is performed in order to establish those features.īeryllium’s (and Be-38AL’s) fracture toughness value (K 1c) is 9 ksi √in. Chemical milling of 0.002” is performed to remove that damage. This final cut of 0.002” leaves a damage layer of approximately. These sequential cuts remove the previous cuts surface damage. Typically, conventional machine cut depths are taken at. Reiterative machining is performed after EDMing with stress relief steps intertwined. EDMing is an enabling process for beryllium, because it avoids beryllium’s fracture sensitive behavior. Without EDMing, large sections of material would require removal by conventional means inducing substantial stress into the component risking the potential of a crack developing. The advantage that EDMing provides is that it circumvents the introduction of a lot of the induced stress due to the removal of nonessential materials. After EDMing conventional CNC machining can be applied. EDMing is a low stress way to remove a large amount of the material from the overall structure. It does leave a recast layer that requires removal. Typical steps in manufacturing usually include EDMing because of its low stress / non-twinning of the parent metal. Figure 2: Precision component with tolerance to 0.0002”
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