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A three-axis free bending local progressive forming device and method

A technology of incremental forming and propulsion device, which is applied in the advanced manufacturing field of three-axis free bending partial incremental forming, can solve the problems of low forming quality, high production cost, low production efficiency, etc., and achieves simple and feasible method, improved efficiency, and flexible forming. great effect

Active Publication Date: 2019-11-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of the prior art, the present invention provides a three-axis free bending local progressive forming device and method, adopts online adjustment of the shape and size of the bending die, and proposes a three-axis free bending local progressive forming technology, which effectively solves the problem The problems of low production efficiency, high production cost and low forming quality in the production of variable cross-section three-dimensional complex components in practical applications

Method used

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  • A three-axis free bending local progressive forming device and method
  • A three-axis free bending local progressive forming device and method
  • A three-axis free bending local progressive forming device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In the first step, put the H68 copper alloy tube with a length of 1170mm, a diameter of 15mm and a wall thickness of 1mm into the equipment, and push the tube blank forward by the push block;

[0037] In the second step, the bending die is adjusted to a circular opening under the control of the system, and the opening diameter is 15.2mm;

[0038] In the third step, the spherical bearing moves from the initial position to the eccentric position with coordinates (0,10) on the motion plane, and then drives the bending die to move with a clockwise quarter-circle track to realize the three-dimensional free bending of the tube blank. bent into shape, and finally obtained as Figure 4 The complex curved hollow member shown.

[0039] The fourth step is to modify the parameters of the bending process to solve the problem of springback after bending by performing three-dimensional scanning on the bent hollow member and comparing it with the three-dimensional geometric model of t...

Embodiment 2

[0041] The first step is to put a 1060 aluminum alloy tube with a length of 1500mm, a diameter of 20mm, and a wall thickness of 2mm into the equipment, and push the tube blank forward by the push block;

[0042] In the second step, the bending die is adjusted to a circular opening under the control of the system, and the opening diameter is 20.2mm;

[0043] In the third step, the spherical bearing moves from the initial position to the eccentric position with coordinates (0,15) on the motion plane, and then drives the bending die to move with a counterclockwise half-circle track to realize the three-dimensional freedom of the tube blank. bent into shape, and finally obtained as Figure 5 The complex curved hollow member shown.

[0044] The fourth step is to modify the parameters of the bending process to solve the problem of springback after bending by performing three-dimensional scanning on the bent hollow member and comparing it with the three-dimensional geometric model o...

Embodiment 3

[0046]The first step is to put a 5754 aluminum alloy tube with a length of 1000mm, a diameter of 10mm and a wall thickness of 1mm into the equipment, and the push block pushes the tube blank forward;

[0047] In the second step, the bending die is adjusted to a locally convex shape under the control of the system.

[0048] In the third step, the spherical bearing moves from the initial position to the eccentric position with coordinates (0,-8) on the motion plane, and then drives the bending die with a counterclockwise one-third circular arc track to realize three-dimensional tube blank Free bending shape, and finally get such as Figure 6 A complex curved hollow member with grooves is shown.

[0049] The fourth step is to modify the parameters of the bending process to solve the problem of springback after bending by performing three-dimensional scanning on the bent hollow member and comparing it with the three-dimensional geometric model of the target product.

[0050] The...

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Abstract

The invention discloses a three-shaft free bend local incremental forming device and method. The device comprises a pipe blank pushing device, a bend mold and a spherical bearing (7), wherein the bendmold comprises a bend mold frame (5) and alloy steel rods (6); the bend mold frame (5) is peripherally provided with multiple through holes; the alloy steel rods (6) are mounted in the through holes;each alloy steel rod (6) is driven by a driving device to freely extend in the radial direction of the bend mold frame (5); and each alloy steel rod extends in the radial direction of the bend mold frame (5) to adjust the inner diameter and the shape of the bend mold so as to incrementally form parts with different section sizes and section shapes. Through change of composition shapes of fine alloy steel rods, the size and the shape of the bend mold can be adjusted, so that the section shape and size of a bent pipe can be changed.

Description

technical field [0001] The invention relates to the advanced manufacturing technology field of three-axis free bending local progressive forming, in particular to a three-axis free bending local progressive forming device and method. Background technique [0002] Hollow components with complex shapes (usually presenting various complex spatial configurations) are often used in aerospace vehicles, and the bending radii are different everywhere, and the forming accuracy is required to be high. Also, the cross-sectional characteristics of the hollow member may vary along the axis. At the same time, due to the special working environment, it is required that it can withstand the high pressure generated by liquid circulation, and that the tube blank does not produce cross-sectional distortion during cold bending, and can be flared and flattened without cracks. The above technical requirements put forward strict requirements on the forming quality of hollow components. Very deman...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D11/06
CPCB21D11/06
Inventor 王辉郭训忠光凯惠谷岩波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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