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Hydraulic forming method of asymmetric hollow pipe fitting of high expansion capacity

A hydroforming and asymmetric technology, which is applied in hydroforming of asymmetric hollow pipe fittings and hydroforming of high-expansion asymmetric hollow pipe fittings. And other issues

Inactive Publication Date: 2011-05-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that it is difficult to form an asymmetric hollow pipe due to the serious thinning of the top wall thickness of the expansion end of the asymmetric hollow pipe in the existing hydroforming method, and to provide a high-expansion asymmetric hollow pipe. Hydroforming method

Method used

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  • Hydraulic forming method of asymmetric hollow pipe fitting of high expansion capacity
  • Hydraulic forming method of asymmetric hollow pipe fitting of high expansion capacity
  • Hydraulic forming method of asymmetric hollow pipe fitting of high expansion capacity

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specific Embodiment approach 1

[0017] Specific implementation mode one: combine image 3 and Figure 4 To illustrate this embodiment, the steps of a hydroforming method for a high-expansion asymmetric hollow pipe in this embodiment are:

[0018] Step 1. Forming the intermediate blank:

[0019] First, put the initial tube blank into the mold of the forming part, and place a cushion block on the raised part of the asymmetric structure in the mold. The raised height is 85%-95% of the raised height of the formed part, and then the mold is closed, and the punches at both ends of the initial tube blank are fed at the same time to seal the two ends of the initial tube blank; The liquid pressure is used for bulging, and the pressure is 50-80MPa. After the bulging is completed, increase the pressure to 100-120MPa, and keep the pressure for 3-7 minutes; then remove the punches at both ends of the initial tube blank, and release the pressure. At the following time, open the mold and take out the formed test piece, ...

specific Embodiment approach 2

[0025] Embodiment 2: In step 1 of this embodiment, the height of the protrusion of the intermediate blank is 85%-90% of the height of the protrusion of the formed part. The inhomogeneity of deformation is effectively alleviated, which greatly reduces the difficulty of forming. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: In step 1 of this embodiment, the height of the bulge of the intermediate blank is 90%-95% of the height of the bulge of the formed part. The inhomogeneity of the deformation is effectively alleviated, the difficulty of forming is reduced, and the completion of the subsequent process is facilitated. Other steps are the same as in the first embodiment.

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Abstract

The invention relates to a hydraulic forming method of an asymmetric hollow pipe fitting of high expansion capacity, in particular to a hydraulic forming method of an asymmetric hollow pipe fitting. The invention solves the problems that the asymmetric hollow pipe fitting easily cracks and is not easy to form because the wall thickness reduction at the top of the expansion end of the asymmetric hollow pipe fitting is serious in the hydraulic forming method. The method provided by the invention comprises the following steps: placing a cushion block at the bulged part of an asymmetric structurein a mould, wherein the height of the bulge of a middle blank is 85-95% of the height of the bulge of a formed component; sealing the two ends of an initial pipe blank; applying liquid pressure towards the interior of the initial pipe blank for bulging; enhancing the pressure, maintaining the pressure, releasing the pressure and taking out the middle blank after bulging; applying an external force on a push plate so that the top end of the maximum deformation section of the middle blank is in contact with the mould to obtain the blank with the changed section shape; placing the blank with thechanged section shape into the mould; applying the liquid pressure in the mould for bulging under high pressure; releasing the pressure; and taking out the final formed component. The invention is suitable for the hydraulic forming of the asymmetric hollow pipe fitting.

Description

technical field [0001] The invention relates to a hydroforming method for an asymmetric hollow pipe fitting, in particular to a hydroforming method for an asymmetric hollow pipe fitting with high expansion, and belongs to the technical field of hydroforming. Background technique [0002] At present, in the industry, for shaft parts that mainly bear torsional loads, the most obvious feature of adopting a hollow structure is to reduce the mass, which can not only ensure the power transmission capacity, but also greatly reduce the overall mass. , The aerospace industry is very important, such as satellites and rockets, the direct effect of reducing the mass is to increase the payload. [0003] Another benefit of weight reduction is energy saving. For cars, every 10% weight reduction can reduce fuel consumption by 8%-10%. In addition, the hollow structure is used to reduce the moment of inertia and increase the output power, which improves the overall performance of the engine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/033B21D26/041
Inventor 林俊峰李峰刘钢苑世剑
Owner HARBIN INST OF TECH