A three-roll cross-rolling forming method for asymmetric double-step rotary body parts

Abstract

The invention relates to a three-roll cross rolling forming method for asymmetrical duel-step revolving body parts. The method comprises the following steps of: (1) determining the shape of a blank according to asymmetry degree of parts, and determining the volume distribution ratio according to metal flowing rules so as to determine the size of the blank; (2) according to three-roll cross rolling forming principle and equipment structure and size requirement of the blank and the parts, firstly designing the size and position on the working plane of a secondary roll, and then determining the size of a main roll; (3) according to three-roll cross rolling gripping conditions and roll size, blank size and part size, sequentially designing the rotating speed of the main roll, the feeding speed and rolling time of the main roll; and (4) rolling and forming the parts according to rolling parameters of the step (3). The three-roll cross rolling forming process parameters of the parts can be reasonably determined, the stable rolling forming of the parts can be ensured, the rate of the rolled waste and defective products can be decreased so as to realize low-consumption, high-efficient and high-quality forming manufacturing of mechanical parts such as a duplicate gear, a double-side supporting wheel body and a high-pressure valve body.

Description

technical field [0001] The invention relates to a three-roll cross-rolling forming method for an asymmetric double-step revolving body part. Background technique [0002] Asymmetric double-step rotary parts, such as figure 1 As shown, its geometric feature is that the surface is composed of upper and lower steps with asymmetric length or height to form a deep groove, with a small hole or no hole in the center. Typical applications are duplex gears in construction machinery, double-sided roller bodies, etc. . The deep grooves on the surface of such parts are difficult to be directly and accurately formed by forging. At present, free forging or die forging is usually used for simple forming, and then cutting is used to form the shape. Destroy the metal fiber streamline of the parts, resulting in low production efficiency, high cost, and poor product performance. [0003] Three-roll cross rolling is a new plastic processing technology that uses rotary plastic deformation to ...

AI Technical Summary

Problems solved by technology

[0004] However, the three-roll cross-rolling deformation is a complex dynamic deformation process under the coupling of multiple parameters, and due to the geometric asymmetry of the asymmetrical double-step rotary parts, the metal flow and geometric forming laws during the rolling process of the parts are very complicated. There are many influencing parameters, and it is necessary to reasonably match the design rolling process parameters to effectively control the metal flow and motion deformation during the rolling process. Otherwise, defects such as flattening of parts and insufficient cross-section are likely to occur during rolling.

Due to the lack of an effective rolling method, various rolling defects often occur in actual production, and the rolling waste and defective rate are high. As a result, such parts are still produced by traditional forging combined with cutting processing methods.

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