| 摘要 |
PCT No. PCT/AT81/00026 Sec. 371 Date Jun. 24, 1982 Sec. 102(e) Date Jun. 24, 1982 PCT Filed Oct. 19, 1981 PCT Pub. No. WO82/01493 PCT Pub. Date May 13, 1982.The invention is concerned with the object of providing an advantageous manufacturing method for a machine hollow cylinder subjected to high working pressure and pronounced erosion action, especially those used for plastic processing machines. To that end a preferably cylindrical-shaped blank composed of a high-wear resistant, hardenable and corrosion-resistant steel core and a sleeve formed of structural steel, is shaped by forging or hot rolling while forming a metallic bond between core and sleeve and a reduction in the cross-sectional area of the core material by at least 20%. Then by applying a bore while taking into account the machining clearance there is formed the hollow cylinder, there is accomplished the hardening which is accommodated to the core material, and there is undertaken the machining for obtaining the desired final dimension.
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