| 摘要 |
Pair of thread split inserts (12,14) are formed by injection molding a ceramic core, casting wax around it, and investment casting metal in a mold to replace the wax and form a hollow inner part (44) of the inserts having a cylindrical outer surface with grooves forming inner portions (84) of encircling cooling fluid conduits. A hollow outer metal part (46) is also formed having outer portions (110) of the conduits. It is fitted around the inner part and the two parts are brazed together before being cut in half to form the inserts, each having one of the conduits. Preferred Features: The outer surface of the inner part is machined to a predetermined size. The outer part is made by machining. The parts are integrally brazed in a vacuum furnace and cut in half using an electrical discharge machine. The brazed parts are also machined to provide a desired finish and shape. |
