Rectangular hollow steel profile stretch bending forming method and special clamping device thereof

Abstract

The invention relates to a rectangular hollow steel profile stretch bending forming method and a special clamping device thereof. The rectangular hollow steel profile stretch bending forming method comprises the following steps of 1, putting elastic core iron in a rectangular hollow steel profile blank, plugging one end, filling with sand, and compacting the sand by a mechanical vibration device; 2, plugging the other end of the rectangular hollow steel profile blank; 3, putting the rectangular hollow steel profile blank into a stretch bending machine; 4, pressing the rectangular hollow steel profile blank by the clamping device; 5, applying pre-stretch tensions at the two ends of the rectangular hollow steel profile blank; 6, bending the rectangular hollow steel profile blank along a stretch bending copying die; 7, supplementing the tension to enable the rectangular hollow steel profile blank to form tightly along the bending copying die; 8, unloading the tension, and taking off a forming piece from the stretch bending machine. The special clamping device comprises a screw rod, a support frame and a cover plate, wherein the screw rod is detachably and fixedly connected with the support frame, and the screw rod is detachably and fixedly connected with the cover plate through a circular groove. The method and the device can effectively prevent products from generating warpage, depression, wrinkles and rebounding.

Description

technical field [0001] The invention belongs to the field of plastic processing of section steel, and in particular relates to a stretch-bending forming method of rectangular hollow section steel and a special clamping device thereof. Background technique [0002] At present, the manufacturing methods of rectangular hollow section steel mainly include: split tailor welding and three-roll bending. Among them, the split welding method divides the steel into several small plates, and then makes these small plates into the required shape, and finally welds them together to form a complete circle. This method has disadvantages such as easy deformation of the product after tailor welding, difficulty in radius correction, low product qualification rate, poor product appearance quality, low raw material utilization rate, high labor intensity, and high production cost. Three-roll bending is to divide the steel into three sections, and each section uses a rectangular hollow section s...

AI Technical Summary

Problems solved by technology

In this method, after roll bending, the product has a large amount of rebound, which brings great difficulties to the follow-up adjustment work. In addition, when the product radius is small and the cross-sectional size is large, defects such as warping, depressions, cracks, and wrinkles are prone to occur, that is, three Roll bending has limitations on the radius and cross-sectional size of the product

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