Rolling method for special-shaped thin-wall casing ring forgings with outer island bosses

Abstract

The invention discloses a rolling method for a special-shaped thin-walled casing ring forging with outer island bosses. One part of the target special-shaped thin-walled casing ring forging is a nearly rectangular section ring, and the other is a near-conical ring and has a There are outer island bosses, first blanking, upsetting and punching to obtain a nearly rectangular section ring blank, then unilateral flaring to obtain a thick-walled special-shaped section ring blank, and then rolling to obtain a special-shaped section ring blank, and then rough rolling to obtain the inner strip. The special-shaped section ring blank of the rotary boss, the inner rotary boss is a ring-shaped protrusion located at the inner side of the near-conical cylinder ring corresponding to the height of the outer island boss, and then reshaped to improve the circularity of the special-shaped section ring blank with the inner rotary boss. The outer surface of the thin-walled casing ring forgings is close to the net shape and the volume of the inner rotary boss is transferred to the outer surface to obtain the outer island boss. The invention has a near net shape special-shaped thin-wall casing ring forging on the outer surface and obtains the outer island boss on the outer surface, which can ensure the outer diameter and the outer island boss precision, and has low machining allowance.

Description

technical field [0001] The invention belongs to the technical field of forging and ring rolling, in particular to a rolling method for a ring forging of a special-shaped thin-walled casing with outer island bosses. Background technique [0002] In the technical field of forging and ring rolling, the forging process of rolling a ring billet with a smaller diameter and a larger wall thickness into a ring forging with a larger diameter and a thinner wall thickness is called ring rolling. According to different classifications, the existing rolling equipment can be divided into horizontal ring rolling mills and vertical ring rolling mills, or divided into radial ring rolling mills and radial axial ring rolling mills. Ring forgings with various cross-sectional shapes can be rolled on these ring rolling mills through various roll forms. However, the ring forging products produced by the existing ring rolling mill and rolling process all have the characteristics of axisymmetric ro...

AI Technical Summary

Problems solved by technology

However, the ring forging products produced by existing ring rolling mills and rolling processes all have the characteristics of axisymmetric gyratory bodies, and cannot roll rings with island bosses on the outer surface of the gyratory body (the island bosses mentioned here mean that the bosses have Certain height and discontinuity, randomly distributed on the outer surface of the rotary body ring)

[0003] For the above rings with outer island bosses, such as special-shaped thin-walled casing ring forgings with outer island bosses, in addition to the large machining allowance generally reserved, the current method is to first roll out the outer ring of the envelope. The larger slewing ring forging of the island boss wraps the outer island boss and other fine contours in the Paul surface to form a ring forging with a very large wall thickness. At this time, the wall thickness is generally above 40mm, and then through CNC milling (Because the CNC machine cannot be processed, it usually requires 5-axis simultaneous milling to process the 3D curved surface of the outer surface) to remove the excess material on the outer surface except the boss, which not only wastes raw materials (the material utilization rate is only about 5%), but also due to It is not an axisymmetric rotary feature, so it can only be processed by 5-axis CNC machining, which greatly increases the machining cycle and cost, and reduces the overall manufacturing efficiency of the product. Especially in the aerospace field, a large number of high-temperature alloy titanium alloy materials are used, not only the processing is more difficult , and the wasted raw material is more expensive

At present, even if there is closed rolling with sleeve dies, due to the complicated loading and die loading process and the excessive temperature drop of the ring billet, it is very difficult to form the precise features of the ring, and it is even impossible to form these precise features.

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