The shape of the rolled piece of the intermediate billet after the last pass of widening in the production of medium and heavy plates
A rolled piece and finishing technology, which is applied in the field of plate shape control in the production of medium and heavy plates, can solve the problems of small amount of reserved extrusion at the end, slow down-pressing speed, and slow metal flow, etc. Reduced loss and high bilateral symmetry
Active Publication Date: 2017-05-03
福建三钢闽光股份有限公司 +1
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Problems solved by technology
[0003] The reason is that the pressing speed of the dog bone rolling is fast, so the reserved extrusion amount at the end of the trapezoidal section at both ends is small, and the extrusion is fast; the pressing speed is slow, the metal flow is slow, and the excess amount reserved It needs to be more, and the length direction needs to be longer to be extruded
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[0019] The present invention includes that the thickness of the longitudinal section of the rolled piece is H d The medium rectangular section is characterized in that: the two ends of the middle rectangular section of the longitudinal section of the rolled piece are firstly an extended outer large and inner small symmetrical trapezoidal section. Longitudinal length L 2 is 400mm, and the rest of the size data are expressed in the following formula:
[0020] The length L of the rolled piece after rolling in the last pass of widening f =B f +K
[0021] One-side rolled piece reduction thickness
[0022] Depression deviation
[0023] Thickness of outer rectangular section
[0024] Longitudinal length of outer rectangular section L 1 =
[0025] Thickness H of the middle rectangular section d =H b -2×△h
[0026] where H b（n－1） is the thickness of the rolled piece before rolling in the last pass of widening, L s is the width of the rolled piece before the final p...
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Abstract
The invention discloses an intermediate blank rolled piece shape control method after last-pass broadening during medium plate production. The intermediate blank rolled piece shape control method is characterized in that the single-side roller piece pressing thickness is Deltah=Hb(n-1) / (n*Ls)*Kb*0.1, the pressing deviation value is d=Deltah*400 / Lf, the outer rectangular segment thickness is Hb=Hb(n-1) / n+(Deltah-d)*2, the outer rectangular segment longitudinal length is L1, and the middle rectangular segment thickness is Hd=Hb-2*Deltah; to be specific, the Hb(N-1) is the thickness of the rolled piece before the broadening and last-pass rolling, the Lf is the length after the broadening and last-pass rolling, the Bf is the width after the broadening and last-pass rolling, the n is 1.15, the Kb is 500, and the k is 70 mm, in this way, the steel plate after stretching and last-pass rolling is in the shape like the rectangle.
Description
technical field [0001] The invention relates to a plate shape control technology for medium and heavy plate production, in particular to the shape of an intermediate billet rolled piece after the final widening pass of medium and heavy plate production. Background technique [0002] In the production of medium and heavy plates, due to equipment and logistics constraints, the billet specifications are relatively single, but the thickness and width of the finished products are most varied. Therefore, the production of medium and heavy plates mostly includes three stages of forming (rough rolling), widening and elongation (finish rolling). Due to the difference in metal fluidity, the plate edge is unevenly deformed after rolling in the elongation (finish rolling) stage, especially the tongue shape at the head and tail of the steel plate, and is longer, resulting in cutting head and tail accounting for more than 1 / 3 of the yield loss. In order to reduce the loss of the tongue s...
Claims
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IPC IPC(8): F16S1/12B21B37/16
Inventor 何天仁詹光曹郑芳垣陈帅
Owner 福建三钢闽光股份有限公司