Free bending forming method for spiral three-dimensional complex bent piece

Abstract

The invention discloses a free bending forming method for a spiral three-dimensional complex bent piece. A pipe is fed at the constant speed in the Z direction, a bending die starts to move to the Y-direction eccentric distance Uy position with the assigned bending radius R within the time of t1 from the initial position O, and the bending die stays at the position for the time of t2 so that a half arc length can be formed; then, the bending die starts from the Uy position in the XY plane with O as the circle center and the eccentric distance Uy as the radius to form the 1 / 4 arc track, the bending die finally moves to the X-direction eccentric distance Ux position through several times of deflection and staying and then does not stay, and the bending die returns to the initial position O within the time of t3. The method is a matched bending technology analysis scheme for the pipe three-dimensional free bending device, and the beneficial effects that the pipe three-dimensional free bending device can achieve complex modeling metal component bending and one-time flexible forming are brought into full play; and the method is simple and feasible, the production efficiency is high, and important engineering application value and obvious economic benefits are achieved in the fields of aerospace, nuclear power, automobiles and other projects.

Description

technical field [0001] The invention belongs to the technical field of flexible manufacturing of metal complex components, in particular to a free bending forming method of a spiral three-dimensional complex bending part. Background technique [0002] The spiral three-dimensional complex bending part is an important part of the bending pipe. For example, the spiral coil pipe, which is a special product of the ring part, has the advantages of large heat transfer area and high heat transfer efficiency. It has been widely used in petroleum, chemical industry, metallurgy, Construction, shipbuilding, urban central heating, air conditioning, hot water supply systems, distillation condensers and solvent coolers for washing machines, etc. At present, the production methods of spiral three-dimensional complex bending parts are generally processed and manufactured by forming processes such as winding, rolling, intermediate frequency induction heating bending and flame heating bending....

AI Technical Summary

Problems solved by technology

However, these traditional methods have their own shortcomings: the section distortion and wall thickness of the pipe after bending vary greatly, and the spiral three-dimensional complex bending parts with different curvature radii and pipe diameters must be replaced with different molds, which increases the manufacturing cost; There is a certain limit to the bending radius of the bend, which is only suitable for thick-walled pipes that require a large curvature radius, and the bending radius and pitch are extremely difficult to control; the intermediate frequency induction unit in the intermediate frequency bending pipe consumes a lot of power and equipment investment is large; the flame Due to the low flame heating efficiency, the pipe bending machine is only suitable for bending thin-walled spiral three-dimensional complex bending parts

However, for spiral three-dimensional complex bending parts, the domestic three-dimensional free bending system does not yet have a complete set of forming process analysis methods

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