Roll-extrusion combined near-net-shaping method for rings with sudden changes in outer contour
A near-net-shaped, outer contour technology, applied in metal rolling, geometric CAD, special data processing applications, etc., can solve the problems of destroying the integrity of the metal streamline, weakening the mechanical properties of the ring, and low processing efficiency, and achieves a high efficiency. Conducive to forming and filling, small forming force and improved material utilization
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[0063] The present invention will be further described below in conjunction with drawings and embodiments.
[0064] A rolling-extrusion composite near-net-shaping method for rings with abrupt cross-sections of large outer contours, comprising the steps of:
[0065] S1. Pre-roll forming the blank after upsetting and punching to obtain a ring blank with uniform wall thickness and large-diameter rectangular cross-section; figure 2 and image 3 As shown, during pre-roll forming, under the joint action of the driving roll and the core roll, the wall thickness of the billet is reduced, the inner and outer diameters are enlarged, and the height is basically kept unchanged. When the inner and outer diameters reach the designed size, the radial roll forming Finish.
[0066] According to the principle of constant diameter expansion ratio and volume, the size of ring blank 4 after pre-rolling is calculated by the following formula,
[0067]
[0068] Wherein, D, d, B are respective...
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