Hot upsetting process for cast ingot with large height to diameter ratio for ultra large ring forging

Abstract

The invention relates to a hot upsetting process, in particular to a hot upsetting process for a cast ingot with a large height to diameter ratio for an ultra large ring forging. The process is characterized by comprising the following steps of: 1) hanging a heated high-temperature cast ingot with a large height to diameter ratio on a lower female die; 2) adjusting the position of an upper male die so as to ensure that the central line of the upper male die is coincided with the central lines of the cast ingot and the lower female die; 3) driving the upper male die to move downward by using a power mechanism; 4) further moving the upper male die downward so as to continuously decrease the height to diameter ratio of the cast ingot; 5) reversing the cast ingot which is in a contact molding state by hot upsetting, replacing the lower female die by using a flat plate die and further lowering the upper male die; and 6) replacing the upper male die by using a flat plate die and further lowering the upper male die until the cast ingot is upset to a cast ingot with a required blank height and size so as to obtain an upset blank. On the premise of ensuring that the hot upsetting process of the cast ingot with the large height to diameter ratio is performed successfully, the process also ensures the stress, uniform strain distribution, small bulge and uniform internal structure of the unset blank after upsetting is finished and provides an unset blank with high performance for the manufacturing of a subsequent forging.

Description

technical field [0001] The invention relates to a hot upsetting process in the free forging blanking process of super-large ferrous metal and titanium alloy forgings. Background technique [0002] The manufacture of large forgings has the characteristics of large shape and weight, many varieties but few quantities, long production cycle and high quality requirements, and complex production management. Among them, metallurgy, forging and power generation equipment are the main products that require large forgings, and one of the keys to manufacturing these equipments is the production of large forgings. Super-large bearing inner and outer rings, hydraulic cylinders, etc. not only face harsh working conditions, but also require a high service life, which requires good performance. Therefore, it is of great significance to manufacture high-quality and high-performance forging blanks to manufacture forgings with good performance. [0003] The forging process is widely used in ...

AI Technical Summary

Problems solved by technology

[0004] In the traditional flat free forging hot upsetting method, when the height-to-diameter ratio H / D is greater than 3.0, the ingot is prone to instability and folding during the upsetting process, and the ingot presents a double-drum shape during the upsetting process. , when the drum shape is too large, the internal stress of the ingot will be too large and unevenly distributed, which will easily lead to cracking during the upsetting process of the ingot

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