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Study on the Formability of a Tube in Hydroforming under Linear Loading Paths

Author: WuCongQiang
Tutor: YangLianFa
School: Guilin University of Electronic Science and Technology
Course: Mechanical Manufacturing and Automation
Keywords: Tube hydroforming Loading path Test Equipment Bulging Performance
CLC: TG394
Type: Master's thesis
Year: 2009
Downloads: 60
Quote: 0
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Abstract

Lightweight and integration of structural characteristics of the pipe hydroforming technology in the manufacture of lightweight hollow tapered member has incomparable superiority of traditional manufacturing methods in the automotive and aerospace industries attracted much attention and has been widely used. In the tube hydroforming process, affecting the performance of tube bulging many factors, of which the loading path of the pipe bulging performance impact is particularly significant. To carry out simple, practical research linear load path tube hydroforming technology for the promotion of great significance. In this paper, the linear loading paths bulging pipe performance system. Tube hydroforming for an existing method and test device, this paper proposes a new pressurized fluid within the tube hydroforming method, and accordingly developed a tube hydroforming apparatus; linear load on the existing paths are classified, we propose a practical linear load path; using self-developed device under four linear load path of the pipe hydraulic bulging test; tube hydroforming features for building the finite element model, and four kinds of linear loading paths pipe forming process was simulated; tube hydroforming based on a mechanical model of the bulging process of stress and strain relationships and work derived axial force test device formula; Based on the experimental and simulation results bulging pipe wall thickness distribution, failure patterns and bulging limits were studied. The results showed that: (1) in the tube hydroforming process, including pressure been established, it is not suitable for axial feeding, or pipes prone to buckling failure or bulging area in the local area thickness distribution fluctuation occurs, get The maximum bulging smaller diameter. (2) in the pre-bulging, including pressure remains constant under the conditions of axial feed linearly increases; late in bulging, internal pressure and axial feed increases linearly according to load approach is a more reasonable The new linear load path, bulging parts of good quality. (3) made with a large deformation zone length as the axial tube forming ability evaluation index is feasible: the longer the large deformation region, forming the outline of pipe more smooth, more uniform thickness, the maximum diameter is larger bulging, the forming the mass of parts as possible. (4) \pressurized fluid within the tube bulging new methods. (5) The newly developed test device structure is simple, easy to operate, reliable, and can be used for pipe hydroforming and experimental research; according to the test device work force model when the axial force is derived formulas can be used to guide the selection of Tube hydroforming power and control equipment. This paper presents a pressurized fluid within the tube hydroforming method and the development of the pipe tube hydroforming apparatus hydroforming technology has guiding significance to promote the studied linear load path bulging under the laws of the pipe is loaded Path-depth study provides reference and guidance.

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