METHOD FOR PRODUCING BIMETALLIC AND POLYMETALLIC BODIES WHEREIN THE METALS ARE JOINED TOGETHER BY METALLURGICAL BOND

• Main Author: BOCCALARI M,IT
• Format: Patent
• Language: English
• Published: 26.11.1974
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING

A method is described for producing cylindrical structural elements such as plugs, bolts and the like made up of at least two sections of different metals joined together by metallurgical bond. The required number of blocks are arranged in pairs within a casing to form an extrusion billet, the block of each pair being made of different metals with reciprocal metallurgical affinity. The two blocks of each pair have one flat face disposed against the corresponding face of the other block. After extrusion, the structural elements are separated from the extrusion bar by machining in such a way that the generatrices of the structural element are perpendicular to the extrusion bar and to the transition surface of the two metals. The surface of the harder metal block, before assembling into the billet casing, is machined to form ridges with symmetrical profile which when penetrating the softer metal during the extrusion are bent to form a hooked profile.