Roll-extrusion composite near-net-shaping method for rings with sudden change in inner profile
A near-net shape and inner contour technology, applied in metal rolling, geometric CAD, special data processing applications, etc., can solve the problems of destroying the integrity of metal streamlines, difficulties in ring blank design and forming, and weakening of ring mechanical properties , to achieve the effect of improving the integrity of the metal streamline distribution, improving the comprehensive mechanical properties of the product, and improving the utilization rate of materials
Active Publication Date: 2022-01-04
WUHAN UNIV OF TECH
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Problems solved by technology
Ring rolling is an advanced method for manufacturing high-quality seamless rings through continuous local plastic forming. However, it is difficult to design and form ring blanks required for ring rolling with abrupt cross-sections of inner contours. This method not only causes a lot of material waste and low processing efficiency, but also destroys the integrity of the metal streamline and weakens the mechanics of the ring. performance
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[0103] by figure 1 A large internal profile sudden change section ring is shown as an example, and its dimension is D f = 3000mm, d f1 =2462mm, d f2 =2492mm, d f3 =2746mm, d f4 =2488mm, B f1 =50mm, B f2 =170mm, B f3 =215mm, B f4 = 65mm.
[0104] Step S1—The size of the ring blank before pre-rolling is D 0 =1548mm, d 0 = 400mm, B 0＝ 500mm; the size of the ring blank after pre-rolling is D=2040mm, d=1388mm, B=500mm.
[0105] Step S2—The size of the shaped ring blank after forming is D 1 =2040mm, d 1 =1108mm, d 2 =1192mm, d 3 =1644mm, d 4 =1164mm, B 1 =50mm, B 2 =170mm, B 3 =215mm, B 4 = 65mm; the pressing distance S of the mandrel = 64.5mm, and the rotation angle θ of the flap mold = 60°.
[0106] Step S3—Initial rolling stage feed ΔH 1 = 15mm, the initial rolling feed rate is v 1 =1mm / s; Feed amount ΔH in the main rolling stage 2 =78mm, feed speed v in the main rolling stage 2 =2.5mm / s; Feed amount ΔH in full circle stage 3 =6mm, feed speed v in full c...
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Abstract
The invention discloses a rolling-extrusion composite near-net forming method for a ring with a sudden change in inner contour section, comprising the steps of: S1, pre-rolling and forming a blank after upsetting and punching to obtain a ring blank with uniform wall thickness and a large-diameter rectangular section ; S2. Place the pre-rolled ring blank on the extrusion die, envelop the outer surface of the ring blank and perform multi-pass continuous symmetrical radial extrusion on the inner surface of the ring blank to form a local inner step, and then pass All the inner steps are formed by multiple extrusion forming to obtain the special-shaped ring blank; S3, the special-shaped ring blank is formed by radial closed near-net rolling to obtain the target ring. The method has low energy consumption, high forming efficiency, high dimensional accuracy, high material utilization rate, and improved comprehensive mechanical properties of the product.
Description
technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a rolling-extrusion composite near-net forming method for a ring with a sudden change in inner contour. Background technique [0002] Large-scale internal profile abrupt cross-section rings refer to annular components with a diameter of more than 1 meter, straight walls on the outer surface, and several abrupt steps on the inner surface. This type of ring has important applications in key components of major equipment such as aviation and aerospace. There are high requirements for the comprehensive performance of the product. Ring rolling is an advanced method for manufacturing high-quality seamless rings through continuous local plastic forming. However, it is difficult to design and form ring blanks required for ring rolling with abrupt cross-sections of inner contours. This method not only causes a lot of material waste and low processing efficiency, bu...
Claims
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IPC IPC(8): B21H1/06B21C23/02G06F30/17
CPCB21H1/06B21C23/02G06F30/17
Inventor 华林邓加东钱东升兰箭吴荣文王丰
Owner WUHAN UNIV OF TECH