X=ray tube hollow anode mfg. method from two half-shells for liq. metal filling - using rotation of one half-shell relative to other and forcing half-shells together to cause welding by frictional heating

摘要

The hollow anode mfr. involves using two identical half-shells (3, 30), each made from a disc base (4, 40), and drilled with a hole (7, 70) along their central axes ( delta 3, delta 30). The outer surface (5, 50) is covered with a material (6, 60) of high atomic number, esp. tungsten and the inner side (9, 90) is hollowed out as far as the emissive layer. The two half-shells, which may be preheated, are mounted with the hollow surfaces opposite each other, one for rotation about their common axis of symmetry and the other for displacement along the axis. The first half-shell is rotated at high speed, e.g. 900 rpm, and the half-shells are pushed together at high pressure, e.g. 1 tonne/cm2. The rotation is simultaneously stopped for a simple friction weld, or stopped by inertial friction. USE/ADVANTAGE - Rotary anode, with internal liq. metal cooling; in medical diagnostic radiology; high power, short duration radiography, for scanner or vascular investigation. Gives perfect join and seal between half-shells; no cracks in weld.