Symmetrical composite roll forming method of external step ring with thick wall and small hole

Abstract

The invention relates to a symmetrical composite roll forming method of an external step ring with a thick wall and a small hole, which is characterized by comprising the following steps of: (1) blanking: determining the size of a roll-formed external groove ring according to the size of the external step ring with the thick wall and the small hole, and then determining the size of a ring blank based on the principle that the volume of plastic deformation is unchanged; (2) design of grooves: designing the working face sizes of a king roller and a core roller according to the rolling deformation conditions of the ring and the structural requirements of equipment, and then determining the working face size and position of an auxiliary roller according to the sizes of the ring blank, the ring and the king roller; (3) design of forming parameters: designing the rotating speed of the king roller and the feeding speed of the king roller in sequence according to the rolling deformation conditions of the ring and the size of the king roller; (4) roll forming; and (5) cutting. Through the method, the external step ring with the thick wall and the small hole, such as a pipeline connecting flange, a high pressure valve body and the like in petrochemical and power fields, can be manufactured with low consumption, high efficiency and high performance.

Description

technical field [0001] The invention belongs to the field of plastic processing, and in particular relates to a symmetrical compound rolling forming method for a thick-walled small-hole outer step ring. Background technique [0002] Pipeline connection flanges and high-pressure valve body parts widely used in petrochemical and electric power fields are usually ring parts with steps on the outer surface (referred to as outer step rings), which have large wall thickness and small hole diameter (the wall thickness is usually equal to or exceeds the hole diameter) Aperture), the geometric characteristics of the step depth, is a thick-walled small hole outer step ring. Its traditional manufacturing method is: first make a rectangular ring by free forging, and then process the steps by mechanical cutting, which has high energy consumption, low material utilization and low production efficiency, and the cutting process destroys the distribution of metal streamlines, resulting in po...

AI Technical Summary

Problems solved by technology

However, the rolling ring billet proposed by this method has an outer stepped shape, and it is difficult to make a billet. Especially for large-sized rings, repeated heating and forging is required, and the billet manufacturing energy consumption is high and the efficiency is low.

In addition, the ring rolling method is mainly suitable for forming thin-walled rings with large hole diameters. For thick-walled small-hole stepped rings, due to the small rolling ratio and deep steps, the diameter of the ring will expand during the rolling process. Filling is out of sync, resulting in the step not being fully formed when the outer diameter of the ring reaches dimension

Therefore, the above-mentioned ring rolling method is not suitable for the forming of thick-walled and small-hole stepped rings, and such rings are still manufactured by traditional free forging combined with mechanical cutting methods, resulting in low production efficiency, high cost, and poor product quality

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