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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

Experimental program
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Effect test

Example Embodiment

[0021] Example 1: Such as Figure 4 As shown, the method for correcting the cross-sectional shape of the pipe bender workpiece adopts a pair of correcting molds to correct the workpiece. The correcting mold is set after the bending of the pipe bender workpiece; the correcting mold 3 is located on both sides of the long axis after the cross-section of the workpiece is deformed, and the correcting mold The direction of movement is along the long axis of the deformed section of the workpiece, 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 equal and opposite correction internal forces. The symmetry center of the correction mold is in the plane of the minor axis, and the symmetry center remains unchanged during the correction process;

[0023] The rotation axis of the correction mold itself is manually or automatically adjusted in the normal direction of ...

Example Embodiment

[0024] Example 2: Such as Figure 5 As shown, the method for correcting the section shape of the pipe bender workpiece uses a pair of correcting rollers 4 to correct the workpiece. The correcting rollers are set after the bending of the pipe bender workpiece; the correcting rollers are located on both sides of the long axis after the cross-section of the workpiece is deformed, and the correcting rollers The direction of movement is along the long axis of the deformed section of the workpiece, and the generatrix of the correction roller is a straight line;

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

Example Embodiment

[0026] Example 3: The initial cross-section of the workpiece is circular. The method for correcting the shape of the cross-sectional shape of the pipe bender uses a pair of correcting molds to reverse the deformation of the workpiece. The correcting mold is set before the bending of the pipe bender; the correcting mold is located on the cross-section of the workpiece and the workpiece will be deformed. On both sides of the rear long axis, the movement direction of the correction mold is along the long axis direction after the cross-section of the workpiece will be deformed. Others are the same as Embodiment 1 and 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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