Process and die for forging big circular ring with rectangular section

Abstract

The invention discloses a process and a die for forging a big circular ring with a rectangular section. The big circular ring is forged by use of small-diameter round rod materials. The process is characterized by comprising the following specific steps: after the small-diameter round rod is bent into a big circle, welding the big circle into a circular ring, and forging the circular ring in a die to form the shape of the big circular ring with the rectangular section. The process comprises the following steps of: baiting, bending the die into a circle, welding, polishing, heating, carrying out hot rolling and shrinking, forging, trimming and annealing. The forging die for realizing the process comprises an upper die, a lower die and a guide post, wherein the upper die and the lower die are of a split die insert structure; the upper die comprises a pressure head and a die mold core; the lower die comprises a lower die outer ring and a lower die base; and a die cavity of the big circular ring with a rectangular section, which is not provided with a fillet, is naturally formed among the pressure head, the die mold core, the lower die outer ring and the lower die base. The forging die has the characteristics of novel process, energy and material conservation, high finished product rate, good workpiece quality, simple die structure, low manufacture cost and the like.

Description

technical field [0001] The invention relates to a mechanical manufacturing process, in particular to a forging process and a mold for forging a large circular ring with a rectangular cross-section from a small-diameter round bar. Background technique [0002] For some gears or worm gears with relatively large sizes, the assembly form of the ring gear can not only save some precious metals, but also facilitate the replacement of the ring gear. There are many technological processes in the manufacture of ring gear blanks. Such as: Upsetting—→Punching—→Punch reaming—→Mandrel reaming—→Trimming into a ring. This type of process has low production efficiency and high labor intensity. The metal fiber is cut off during turning, and the forging needs to be heated repeatedly. There are many processes, and the precision of the forging cannot be guaranteed. Another example: blanking of round bars—→rolling into strips with rectangular cross-section—→bending into large circles—→butt wel...

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Problems solved by technology

[0004] However, after investigation and research by the inventor, the above patents have defects such as complicated processing technology and waste of materials. Therefore, how to achieve both simple processing technology and relatively high material utilization rate has always been a concern of the machinery industry. The problem

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