Roll forming is a cold-formed steel
And welded steel pipe forming the main square
Method. Which Roll forming machine is an economic cross-section cold-formed steel sections, because of its
Optimize the economic section, high quality, low energy consumption and economic benefits
Advanced features have been widely used in civil, automotive, aerospace, construction, etc.
Industry, the forming process of the study received extensive attention, and made
Encouraging research.
1 Roll Forming Technology
Traditional roll forming process with leaflets (or single) forming, in rolls
Molding, forming a continuous and joint processing. Currently, countries in the world have
Developed many new roll forming process and molding equipment can be broadly
To be divided into two types.
(1), including Roll VAI's technology focus adjustment (CTA
Technology); Japan in the field produced by the flexible roll forming technology (FF Technology
Surgery); Roll Forming Technology (CBR technology). Its share of roll
Strong, fast roll speed adjustment can achieve flexible production and improve the economy
Efficiency and product quality, mainly used in pipe production. But the CTA technology
Not suitable for production of small diameter pipe; FF maintenance and rolling mill technology to
Roll processing complex; row roll molding thick-walled tubes, rolling mill rigidity does not
Foot.
(2), including the company's non-Japanese Nisshin Steel roll forming technology of natural
Surgery; VAI's with plug-in vertical roll forming technology; Japan and Japan Special
Special steel Co., Ltd. roller squeeze and roll drawing molding technology. Its cost
Smooth-type process, product quality, size and high precision, not only suitable for
Production pipe but also for the production of profiled products and a variety of
a Contact: Zhi-Wu Han, postdoctoral, Changchun (130025) School of Materials Science, Jilin University
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Specifications roll steel. But no natural roll forming, not suitable for the production of thick
Pipe; with plug-in vertical roll forming, roll the design and adjustment difficulties
Large; roll extrusion and drawing roll forming, not suitable for mass production of single products
Products.
2 Roll Forming Theory
Theoretical research in shaping the former Soviet Union has made outstanding scholar
Contribution. Г1Я1 old Grace and other energy method used in 1962 analysis of the angular
Continuous curved wood, but the process of solving the unknown function added to a
These restrictions have limited income deformation work. B1N 1 Davydov made
Deformation of the "smooth transition zone" concept, and gives the conditions and to prevent defects
The maximum allowable bending angle, due to using linear deformation assumption, in practice should
Spend limited. forming machine Тришевския think molding process, the wing
Edge of the section after deformation remain straight, in the shape space dimension is
As ruled surfaces, along the gentle transition section and the section of the bending angle strip
Shape, depending on the location of the studied section.
Scholars of other countries on the roll forming his own theory
The views and opinions. K1N akajim a [1] under the assumption made in the flat section
A longitudinal strain calculated with the actual into the longitudinal strain
When there is a gap type. T 1R1W alker and R1J1P ick [2] formula
N akajim a revised calculation method, to eliminate the N akajim a level
Section caused by the assumption of error, but added a vector formula
Items, which calculate more complicated. Masuda Senhao simple letter etc.
Number indicates when the tube forming strip surface deformation, bending strain obtained
Rate and bending strain, but ignore the film strain, were available only to curvature strain
Forming power analysis, and the actual circumstances differ. In addition,
R 1T 1A ngel linear deformation model proposed for the calculation of the longitudinal channel
Membrane strain; П1Т1 Yeming Yang Ninko tensile deformation of strip edge
And forming the length of the relationship; small Nai Hong computerized design from the roll
Paper proposes channel edge molding track for the three multi-level projection
Item type; Kato raised edge of the vertical strip elongation of expression; and
K1F1Ch iang proposed another expression of stress calculation.
3 roll forming process CAE technology
311 Computer simulation of forming process
The popularity of computer and numerical methods of improvement, as
Numerical simulation of roll forming to provide favorable conditions.
Within the University of Tokyo professor of wood [3] proposes to use the form with a parameter n
Shape function approximation to describe the strip of space in the molding and deformation of curved track
Hand, solving the stress response. And pipe roller, forming process production line,
The number of mill stand, rack space and a series of factors affecting the system
Analysis, at the same time extended to the wide section steel, C steel, V steel
Roll forming and the Longitudinal Study of residual stress. Wood within the Learning and Teaching
Grant research methods used is one way better, but
Surface deformation due to the unknown parameters in a decision, resulting in the
Constructed surface and error between the real surface, thereby limiting the response should be
Forces of accuracy. Yamanashi University, Japan, Ono Tian Yifu, etc. [4] on the straight seam
Welded pipes, rectangular pipe, steel cap outer edge wide roll forming using
Rigid-plastic finite element method simulation, but not of strip molding
The missile complex problem.
U.S. Ro ll2Kraf t's Robert J1Harstain, United Kingdom
Country A ston M ilner University and the University of Canada W aterloo
The Terry R 1W alker and Roy J 1P ick finite element method
Were analyzed using commercial software, pipe, simple and complex profiles section
Wide complex shape forming process Roll former of steel. New Zealand S1M 1Paton
Et al [5] studied the roll forming process, the longitudinal and shear strain that
Roll forming, including longitudinal tension, longitudinal bending, transverse bending and shear
All that type of shear strain than the other large lot. United States
Taylan A ltan, etc. [6] based on finite deformation mechanics, was developed to analyze
Simple computer-aided system section steel, the predicted geometric deformation
Shape and strain distribution were compared with experimental results. France
G1N EFU SSL, etc. [7, 8] on the workstation simulation of rigid plastic material and
Plastic material roll forming process, using P randt l2Reu ss flow
Activity theory and VonM ises yield criterion, the minimum power through the plastic
Of, given optimal configuration, metal deformation zone length and speed optimization
Degree field. French M 1B runet [9] using the finite element method simulation of channel into
Type process, analysis of material throughout the deformation history, won the optimal design
Roll shape. Singapore R 1S1Senanayake [10] use of limited
Element analysis and computer visualization techniques calculate the plastic roll forming process
Of strain, in good agreement with the experimental results.
In China, Cai Songqing first time the complex finite element method
Pipe forming process; Bi-Qiang Zhang and Zhang whole root Zeng Yi mechanics of materials
Of pipe forming problems; to Yanshan University, Professor Liu Cai-led class
Problem sets, respectively, on the roll forming process using the spline finite strip method and shells
Plastic large deformation finite element method, in-depth theoretical and practical system
Research experience, made many important research results.
Molding process technology 312 CAD
Many foreign companies realized early use of computer-aided rolling
Roll the importance of design, and develop their own computer-aided design
Systems, such as the United States G IFFORD2H ILL companies and ROLL 2
DA TA, British MT IRA companies and with the Swiss steel company
Cooperation ROLL SEC, British M ETFORM company, Italy
Italy INDU STR IE SECCO company, Australia CAD2
RO F Company and the Canadian DEL TA EN G Company. East Japan
Beijing University, Italy SECCO Inc., Australia JOHN
L YSA GHT, Germany's MUN ICH, and DA TA M University
Companies were ahead of the computer-aided design technology for doors and windows material
Profile roll forming.