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Stretch-bending forming device with insulated stretching head and forming method thereof

A stretch-bending forming and stretch-bending machine technology is applied in the field of electroplastic stretch-bending insulation pullers and forming devices for aluminum-lithium alloy profiles, which can solve the problems of difficulty in ensuring the stretching and bending requirements of profiles of different sizes, affecting performance, and low density. Achieve the effect of avoiding coating aging and falling off defects, enhancing atomic vibration, and increasing forming limit

Inactive Publication Date: 2013-10-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: the insulating layer will leak due to friction and damage during use and the coating will age and fall off. need
Aluminum-lithium alloy is a very potential structural material. Due to its low density and easy processing, it will be widely used in the aviation manufacturing industry, but it also affects some properties because of its brittleness.

Method used

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  • Stretch-bending forming device with insulated stretching head and forming method thereof
  • Stretch-bending forming device with insulated stretching head and forming method thereof
  • Stretch-bending forming device with insulated stretching head and forming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is a stretch bending forming device for an aluminum-lithium alloy T-shaped bar with a thickness of 2mm, which is obtained after improving the stretch bending machine in the prior art.

[0031]This embodiment includes a stretch bending machine rotating support arm 1, an insulating slider 2, a pneumatic chuck 3, a stretch bending machine turntable 4, an insulating workbench 5, a stretch bending mold 6, and a pulse power supply 7 of the forming device. Among them: the insulating slider 2 is located between the rotating support arm 1 of the stretch bending machine and the pneumatic chuck 3, the front end of the insulating slider 2 is screwed into the threaded hole of the rear cover of the pneumatic chuck 3 through threaded connection, and the rear of the insulating slider 2 The end is connected with the rotating support arm 1 of the stretch bending machine through bolts, and the insulating workbench 5 is installed on the upper surface of the turntable 4 of th...

Embodiment 2

[0040] This embodiment is a method for forming an aluminum-lithium alloy T-shaped bar with a thickness of 2 mm by electroplastic stretch bending using the stretch bending forming device for the insulating slider described in Embodiment 1. The section height of the T profile is 28 mm, and the bending radius of the mold is 250 mm.

[0041] In this embodiment, the stretching force of the main stretching cylinder of the turntable type stretch bending machine is 0-8T, the maximum stroke of the main stretching cylinder is 2000mm, the working speed of the main stretching cylinder is 0-12mm / s, and the diameter of the turntable is 1000mm, the total electrode power is 30.8kw.

[0042] The specific process is:

[0043] The first step is to clamp the parts to be formed. An insulating board is laid on the turntable of the stretch bending machine, and the mold is placed on the insulating board. Put the aluminum-lithium alloy T-shaped bar on the mold and clamp it with a pneumatic chuck to...

Embodiment 3

[0050] This embodiment is a method for forming an aluminum-lithium alloy T-shaped bar with a thickness of 2 mm by electroplastic stretch bending using the stretch bending forming device for the insulating slider described in Embodiment 1. The section height of the T profile is 50 mm, and the bending radius of the mold is 450 mm.

[0051] In this embodiment, the stretching force of the main stretching cylinder of the turntable type stretch bending machine is 0-8T, the maximum stroke of the main stretching cylinder is 2000mm, the working speed of the main stretching cylinder is 0-12mm / s, and the diameter of the turntable is 1000mm, the total electrode power is 30.8kw.

[0052] The specific process is:

[0053] The first step is to clamp the parts to be formed. An insulating board is laid on the turntable of the stretch bending machine, and the mold is placed on the insulating board. Put the aluminum-lithium alloy T-shaped bar on the mold and clamp it with a pneumatic chuck to...

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Abstract

The invention discloses a stretch-bending forming device with an insulated stretching head and a forming method of the stretching-bending forming device. The insulated stretching head is arranged between a rotating support arm of a stretch-bending machine and a pneumatic chuck, and the two ends of insulated stretching head are connected with a rear cover of the pneumatic chuck and the rotating support arm of the stretch-bending machine respectively. An insulated working platform is arranged on the upper surface of a rotary table of the stretch-bending machine. A stretch-bending die is installed on the upper surface of the insulated working platform. A pulse power supply is located at one side of the rotary table of the stretch-bending machine and the pneumatic chuck, the pulse power supply keeps a safety distance from the rotary table of the stretch-bending machine and the pneumatic chuck, and a lead line of the pulse power supply is connected to a part to be formed. According to the stretch-bending forming device with the insulated stretching head, the insulated stretching head is used for achieving insulation between the part to be formed and a machine body of the stretch-bending machine, and therefore the safety of personnel and equipment are guaranteed. Due to applied electric plasticity stretching-bending forming, the resistance to deformation of materials is reduced, the forming limit of the materials is greatly improved, the surface quality and the comprehensive mechanical property of a product are improved, and the production quality and production efficiency of the part are improved. Besides, the stretch-bending forming device with the insulated stretching head is convenient to use, practical, simple in structure, easy to produce and manufacture, and good in insulation effect.

Description

technical field [0001] The invention relates to the technical field of stretch-bending forming of metal profiles, in particular to an electroplastic stretch-bending insulating slider and a forming device for aluminum-lithium alloy profiles. Background technique [0002] Stretch bending forming of profiles has been widely used in aircraft manufacturing, mainly used to form connecting parts such as fuselage, bulkhead, rib, engine frame, etc. The use of stretch bending technology can make the parts obtain a reasonable correction margin and improve the quality of the parts. Manufacturing precision, reduce the manufacturing cost of parts. However, with the increasing requirements of product processing precision, defects such as springback, wrinkling and outer layer cracking in the existing profile stretch bending forming process have become more prominent, which limits the application of traditional stretch bending forming. [0003] Chinese patent CN102172689 (lightweight metal ...

Claims

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Application Information

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IPC IPC(8): B21D7/025B21D7/16
Inventor 孙宝龙王永军武伟超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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