Method for rolling and shaping stainless steel conical ring

Abstract

The invention discloses a rolling and shaping method for a stainless steel conical ring forging in order to obtain the alloy conical ring forgings with excellent tissues and properties as well as realize accurate rolling. The method includes the following steps: alloy bar material is heated, carried out continuous upsetting and deformed by 75 to 80 percent so as to be made into a solid cake and then is punched again to lead the alloy bar material to be made into a hollow round cake after the aperture dimension of the alloy bar material is 15 to 20 percent of the dimension of the outer diameter thereof; a rectangle ring blank is obtained after the hollow round cake is heated, rolled circularly and deformed by 30 to 35 percent and the ring blank is processed into a pre-rolling blank with pitch; the pre-rolling blank is heated and arranged in a rolling die of a ring rolling machine and forms a conical ring forging after being rolled and deformed by 60 to 70 percent in a section groove of the die. When in expansion, the broadening speed of the pre-rolling blank along the radial direction is 2mm / s to 15mm / s with a radial rolling force of 40000kg to 220000kg. The method is mainly used for the shaping of the conical ring forging of a ground gas turbine. The method can be adopted to obtain the concial ring forging that is arranged in a flow line along the outline of a part and the circular surface of the forging is a complex curve.

Description

technical field [0001] The invention relates to a rolling forming method of a ring forging, in particular to a rolling forming method of a stainless steel tapered ring forging. Background technique [0002] The conical ring forgings of ground gas turbines made of stainless steel (such as 0Cr11Ni2MoVNb and other material grades), such as turbine outer rings, casings and other parts, are required to have good performance and structural stability due to long-term work at high temperatures. [0003] The article "New Manufacturing Process and Numerical Simulation of Large Tapered Ring Parts" (Wang Zewu et al., "Nuclear Power Engineering", Volume 28, No. 2, Pages 69-72, April 2007) discloses a conical Ring forming process, which includes billet making, heating, rolling and subsequent processing. When the tapered ring of ordinary carbon steel is rolled by this process, the main roll, core roll and holding roll of the ring rolling machine are processed into a tapered shape, and the...

AI Technical Summary

Problems solved by technology

For the tapered ring forgings processed in this way, the machining allowance of the ring forging blank is large, the dimensional accuracy of the forging is poor, and the shape streamline of the forging cannot be distributed along the shape of the part; due to the large amount of processing, it is time-consuming, laborious and wastes a lot of valuables. The stainless steel material cuts off the shape streamline of the forging, which adversely affects the structure and performance of the forging

[0006] When rolling stainless steel tapered ring forgings, from the alloy bar to the final rolling into tapered ring forgings, the deformation of stainless steel has a great influence on the structure and performance of the ring forgings, and the selection of the deformation is not accurate, which will cause ring forgings Defects such as coarse grains, crushing, rolling cracks, folding, interlayers, etc., which affect the delivery and use of forgings

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