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Method for correcting workpiece crosssection shape of pipe bended by pipe bending machine

A technology of cross-sectional shape and pipe bending machine, which is applied in the field of correction of the cross-sectional shape of the workpiece of the pipe bending machine, can solve the problems such as the influence of deformation and rebound amount and deformation quality, etc., and achieves improved strength, reduced frictional resistance, and small contact area. Effect

Inactive Publication Date: 2005-01-05
张先荣
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AI Technical Summary

Problems solved by technology

[0003] Existing pipe bending machines use methods such as mandrels and filling materials to prevent changes in the cross-sectional shape of the workpiece, and some are equipped with a workpiece correction device, which uses a pair or several pairs of molds with similar shapes to correct or reverse the deformation of the workpiece (workpiece bending The cross-sectional shape is deformed in the opposite direction), the arrangement of the correction mold 2, and the movement direction of the mold are along the short axis direction of the deformed workpiece section, and the correction force acts on the thinnest part of the corrected mold that contacts the long axis direction of the deformed workpiece section , it is not easy to solve the influence of the amount of deformation springback on the deformation quality of the workpiece section, and the mold and the workpiece have a large frictional resistance

Method used

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  • Method for correcting workpiece crosssection shape of pipe bended by pipe bending machine
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  • Method for correcting workpiece crosssection shape of pipe bended by pipe bending machine

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Embodiment 1

[0021] Embodiment 1: as Figure 4 As shown, the method for correcting the cross-sectional shape of the workpiece of the pipe bender uses a pair of correcting molds to correct the workpiece. The correcting mold is set after the workpiece of the pipe bender is bent; The movement direction of the workpiece is along the long axis direction after the deformation of the workpiece section, and the generatrix of the correction mold is a curve. When the curve is an arc, its arc is less than 180 degrees;

[0022] The correction force of the correction mold is a pair of correction internal forces of equal size and opposite directions. The center of symmetry of the correction mold is in the plane of the minor axis, and the center of symmetry remains unchanged during the correction process;

[0023] The rotation axis of the correction mold itself is manually or automatically adjusted and placed in the normal direction of the bending center line of the bend, that is, the radius R direction ...

Embodiment 2

[0024] Embodiment 2: as Figure 5 As shown, the correction method of the cross-sectional shape of the workpiece of the pipe bender uses 1 pair of correction rollers to correct the workpiece. The correction rollers are set after the workpiece of the pipe bender is bent; The movement direction of the workpiece is along the long axis direction after the deformation of the workpiece section, and the generatrix of the correction roller is a straight line;

[0025] The correcting force of the correcting roller is a pair of correcting internal forces of equal size and opposite directions. The center of symmetry of the correcting roller is in the plane of the short axis, and the center of symmetry remains unchanged during the correction process.

Embodiment 3

[0026] Embodiment 3: The initial cross-section of the workpiece is circular, and the correction method for the cross-sectional shape of the workpiece of the pipe bender uses a pair of correction molds to reverse the deformation of the workpiece. The correction mold is set before the workpiece of the pipe bender is bent; After the two sides of the long axis, the direction of movement of the correction mold will be along the direction of the long axis of the workpiece section after deformation. Other is identical with embodiment 1, embodiment 2.

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Abstract

A method for correcting the cross section of workpiece (metal pipe) bent by pipe bender features that 1-5 pairs of correcting dies or roller are arranged before and / or after bending pipe for reverse deformation, each pair of correcting dies or rollers are arranged at both sides of the longer axis of the deformed workpiece and moves in the direction of said longer axis.

Description

technical field [0001] The invention relates to a method for correcting the cross-sectional shape of a workpiece in which metal pipes are bent by a pipe bending machine. Background technique [0002] Existing pipe benders have various structural forms, such as push bending, stretch bending, roll bending, etc., as well as various process methods of hot bending and cold bending. Regardless of the structure of the pipe bender or the process method used, the cross-sectional shape of the workpiece 1 will change during the bending process, such as a circle into an ellipse (such as figure 1 , figure 2 As shown), it affects the quality of the workpiece, and the cross-sectional shape changes greatly when thin-walled pipes, large-diameter pipes, and large-curvature bends. [0003] Existing pipe bending machines use methods such as mandrels and filling materials to prevent changes in the cross-sectional shape of the workpiece, and some are equipped with a workpiece correction device...

Claims

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Application Information

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IPC IPC(8): B21D3/02B21D9/00
Inventor 张本源张先荣张挺锋
Owner 张先荣
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