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Shaping method of small curvature radius bend pipe

A forming method and small curvature technology, applied in the field of elbow manufacturing process, can solve the problems of increasing engine air intake resistance, unable to achieve excessive arc bending, and large diameter

Inactive Publication Date: 2007-02-14
SHIYAN FENGLEI IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the engine intake steel pipes currently used in the domestic automobile industry adopt a tailor-welded structure due to their large diameter, thin pipe wall, and inability to bend. The disadvantage of the tailor-welded structure is that it increases the intake resistance of the engine and increases noise.
Due to technical reasons, the metal thin-walled elbows used in the domestic automobile industry cannot achieve "excessive arc bending"

Method used

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  • Shaping method of small curvature radius bend pipe
  • Shaping method of small curvature radius bend pipe
  • Shaping method of small curvature radius bend pipe

Examples

Experimental program
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Embodiment Construction

[0018] Such as figure 1 As shown, the mandrel of a set of mold used in this embodiment is a universal mandrel in the known technology. This universal mandrel is composed of 2 to 4 metal rings, and there is a certain gap between the rings. Utilize this mandrel according to the method of the present invention and can manufacture the metal elbow that pipe wall thickness is 2 millimeters, bending radius is 1.5D, and its specific method is: the original pipe blank to be bent is passed on the universal mandrel 1a, the original One end of the tube embryo 7 is fixed by the clamping force and the bending die, and the clamping force is provided by the cooperation of the clamping block 4 and the support block 3, and then the bending die 2 is driven by the numerical control pipe bending machine to rotate; in the process of bending and deforming the original tube blank, Such as Figure 9 As shown, two auxiliary thrusts in different directions are added to the tube wall of the original tub...

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Abstract

The method of manufacturing elbow pipe of small curvature radius is one with core axle. The pipe bending process includes stringing a core axle into material pipe, fixing one end of the material pipe to the bending mold, and turning the bending mold in the bending machine while applying two auxiliary push forces, including one in the direction for the inner wall to contract and one other in the direction for the outer wall to stretch. The present invention makes it possible to manufacture metal elbow pipe with wall thickness smaller than 0.5 mm and ending radius greater than 0.5D, and may be used in manufacturing intake pipe, cooling air pipe, etc for automobile engine.

Description

technical field [0001] The invention relates to a manufacturing process of an elbow, in particular to a manufacturing process of an elbow with a small radius of curvature. Background technique [0002] There are two types of existing pipe bending technology. One is the coreless rolling method, which fixes the bent pipe, rolls the pipe with rollers, and uses the bending die as a support to deform it. The second is to use a cored bending method to fix one end of the bent pipe with the bending mold. When the mold rotates, the other end of the pipe is deformed. The common disadvantage of these two bending technologies is that the tube is supported by its own tube wall strength when it is bent and deformed. When the pipe wall is less than 2.0 mm and the bending radius is less than 1.5D (D represents the diameter of the pipe), the support strength of the pipe wall is not enough, and the parts subjected to a large force are free to deform, and the ideal bending effect cannot be ac...

Claims

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Application Information

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IPC IPC(8): B21D9/07B21D9/16B21D9/03
Inventor 熊雷
Owner SHIYAN FENGLEI IND & TRADE
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