Method for determining rolling curve for two-way rolling process of ring

Abstract

Disclosed is a method for determining the rolling curve for the two-way rolling process of a ring. By determining the dimensions Df, hf and bf of the formed ring and the dimensions D0, h0 and b0 of a blank, the coordinates of the starting point of the rolling curve and the coordinates of the ending point of the rolling curve are obtained. Then, relevant roller dimension parameters and technological parameters are obtained, and the reasonable value range of a power exponent n is determined. Finally, the specific value of the n and the form of the rolling curve are determined, a corresponding rolling curve equation can be determined, and therefore the graph of the rolling curve is obtained through drawing. For rolling of a certain ring product, the method can be used for determining upwards-convex, linear and downwards-concave rolling curves at the same time; for the upwards-convex rolling curve and the downwards-concave rolling curve, a series of rolling curves can be obtained by selecting different power exponents n. Thus, the special requirements for rolling curves in different convex and concave degrees can be met in the rolling processes of different rings, an important method and an important foundation are provided for shape and property integrated forming of rings made of materials difficult to deform, and realization of automation of the double-way rolling process of the ring is facilitated.

Description

technical field [0001] The invention belongs to the field of rolling and forming processing of rings, and in particular relates to a method for determining a rolling curve of a bidirectional rolling process of a ring. Background technique [0002] The rolling curve describes the instantaneous distribution relationship between the radial and axial deformation of the ring in the two-way rolling process, and then determines the history of the deformation process and the path of the roll, so it has a great influence on the geometric accuracy of the final rolled ring, especially the microstructure. This is especially true for ring rolling of difficult-to-deform materials such as titanium alloys. Therefore, the determination of the rolling curve is one of the most important core technologies for bidirectional rolling of hard-to-deform materials (titanium alloys, high-temperature alloys, etc.). At present, the determination of rolling curves mostly depends on direct production exp...

AI Technical Summary

Problems solved by technology

Jian Haiyan and others studied the two-way rolling process of ring parts by modifying the WAGNER rolling curve (Jian Haiyan, Chen Zhigang, Song Tao. Ring rolling process of radial and axial ring rolling machine [J]. Forging Technology. 1995, 3: 37-40) , but the correction of the rolling curve depends on experience, and there is a lack of scientific methods to determine the rolling curve; Liu Dong et al. experimentally studied the effects of three typical rolling curves on the ring temperature, diameter growth rate, and The influence of rolling force (Liu Dong, Fu Mingjie, Wan Ziyong. Experimental study on the rolling curve of GH4169 alloy rectangular cross-section ring [J]. Acta Aeronautica Sinica. 2007, 28(5), 1276-1280), although the research It is mentioned that a power function is used to describe the rolling curve, but the specific method and steps for determining the rolling curve are not disclosed

Taking rolling curve and rolling curve as key words, after searching domestic and foreign patent databases and paper databases, there is no public report on the method of determining the rolling curve

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