Roll bending forming method of D-shaped steel tube

Abstract

The invention discloses a roll bending forming method of a D-shaped steel tube. The roll bending forming method comprises the following steps that 1, in a shaping stage, a small edge on the straight side of the D-shaped steel tube is shaped to 88 degrees by a cold-bending forming unit under the condition that the forming angles of first four passes are set to be 25 degrees, 48 degrees, 72 degreesand 88 degrees respectively; 2, meanwhile, an arc section on an arc side is shaped to 90 degrees by the cold-bending forming unit according to that central angles of the arc side are 23 degrees, 45 degrees, 68 degrees and 90 degrees respectively; 3, vertical rollers are additionally arranged between every two adjacent passes; 4, a straight side waist part of the D-shaped steel tube is shaped by the cold-bending forming unit under the condition that the forming angles of last six passes are set to be 16 degrees, 32 degrees, 48 degrees, 64 degrees, 72 degrees and 88 degrees respectively; and 5,in an extrusion welding stage, the product subjected to the ten passes of machining enters extrusion rollers, wherein the three rollers, namely the extrusion rollers on the left side and the right side and an upper roller on the arc side are used for extruding to finish welding. According to the roll bending forming method, the manufacturing cost is low, and the product quality can be ensured.

Description

technical field [0001] The invention belongs to the technical field of cold bending forming, and in particular relates to a roll bending forming method of a D-shaped steel pipe. Background technique [0002] With the continuous development of cold roll forming technology, users' requirements for products (lightweight materials, high strength, and cross-sectional diversity and complexity) are also increasing. However, the diversity and complexity of the cross-sections pose the greatest challenge to the roll forming process. As one of the cold-formed steels with complex cross-sections, D-shaped steel pipes are increasingly used in construction machinery. At present, there are mainly two forming schemes for D-shaped steel pipes: one is to form a circle first, and then form a D-shape; the other is to directly form a D-shape with reference to the square-rectangular pipe forming scheme, that is, the angular symmetric forming method. Adopting the first scheme requires a large num...

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Problems solved by technology

Adopting the second scheme can largely use the mold for forming square and rectangular tubes, and the production cost is low. However, in the production process, due to the inconsistent stretching degree of the two welding sides, it is easy to cause defects such as side waves and waves, which seriously affects the welding. Quality, product quality cannot be guaranteed, and large-scale promotion cannot be carried out

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