Abstract
1. Blanks, parts, contact units made of SEC even with poor physicomechanical properties have a sufficiently high safety factor. When the machine rotor rotates at 1500 rpm, the safety factor with respect to the fracture speed of rotation KB = 9−12, which is much better than the permissible value. 2. The use of rings made of SEC instead of rings made of chromium bronze (BrKh.08) provides great savings in chromium, a metal in short supply, lowers the prime cost of production, and considerably increases the reliability in operation and the service life of the contact unit. (Wear resistance of rings made of SEC is two or three times greater than that of chromium-bronze rings.) 3. Blanks for rings with different physicomechanical properties withstood static loading at rotary speeds of 17,000–20,000 rpm. Residual strains in these cases amounted to ɛres = 0.9−2.3%. 4. Fracture of parts made of SEC occurred at lower rotary speeds (14,000–17,500 rpm). The lower strength was due to the presence of holes for pins. Fracture of parts made of SEC with poor mechanical properties (group III) occurred practically without plastic strain. Parts made of SEC with better properties have a residual strain ɛres = 0.5−6% upon fracture.
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