| 摘要 |
<p>1,272,245. Casting composite rotors for electrical machines; casting processes. INSTITUT ELEKTROSVARKI IMENI E.O. PATONA AN UKSSR. 7 May, 1969, No. 23219/69. Heading B3F. A composite metallic blank of a rotor for an electrical machine is made by putting a magnetically non-permeable (first) metal (15) to be melted, into a mould 10 containing magnetically permeable metal parts 13 of the rotor or into a container formed of that metal and including those parts (13) within it, then heating the mould or container in a reducing atmosphere (and maintaining a temperature exceeding the melting temperature of the first metal so that a surface diffusion occurs between the metals) before cooling to solidify the molten (first) metal. The rotor blank is removed from the mould 10 but when the container is used it becomes part of the blank. The container or mould 10 is supported on a base 9 within an induction heater 2 mounted on a post 1 which incorporates a supply for the heater. In the spaces (14) between steel rotor parts (13) are put a Cu-Ni-Mn based alloy (15) (magnetically non-permeable) and a flux (16). The heater 2 is then activated to melt the flux and then the alloy (15); the mould is oscillated by a vibrator 8 to aid degassing and separation of impurities while the metal surfaces diffuse. The vibrator is switched off, a cooling sprayer 5 is raised by a drive 11 into the mould 10 or container and the heating is reduced, so that there is directional solidification of the alloy. The rotor blank thus obtained is heated in oil to temper and anneal the steel parts (13) and aged by heating in air for dispersion-hardening of the alloy parts (15).</p> |
