Composite heavy-duty mechanism element

Abstract

Abstract A composite mechanism element, such as a composite bevel element (FIGS. 1 to 6 inclusive), has its working or load-bearing portion or portions composed of sintered powdered high-performance alloy while its supporting portion not subjected to concentrated or heavy loads, is made of an inexpensive base metal, such as sintered powdered iron. The outer load-bearing portion of the composite bevel element and the hollow frusto-conical inner supporting portion (FIGS. 5 and 6) are separately briquetted from high performance alloy powder and low performance metal powder respectively and separately sintered after which the low performance inner supporting portion is pressed in the high performance toothed outer portion so as to be inseparably secured thereto. The low-performance and high-performance portions separately sintered and thereafter are pressed together in an assembling operation which causes the high performance and low performance portions of each race to be inseparably secured to one another. The resulting composite sintered powdered mechanism elements are of much lower material cost than corresponding mechanism elements formed of high performance alloy throughout yet perform satisfactorily and have sufficient strength and durability for most purposes. These heavy-duty mechanism elements may be used as they are if of satisfactory density for their intended uses, or they may be further densified by being subjected to an additional hot forging operation which rams the portions together under high heat and pressure in the forging die of a forging press and thereby not only substantially solidifies the hitherto porous structure but also causes metallic interflow across the junction or boundary between the two portions so as to still more tenaciously join them together.

Inventors

• 👤 W Dunn
• 👤 M Sarnes

Bibliographic Details