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Based on the amount of control the thinning of the cavity to push bending design guide lines


, 4.177,6.078,) ((p1, (pl / Xw, [(p1X,)] = 127.526 ((pl, (p1) = ΣW, l (,)]= 782.709,christian louboutin sko, = s4. ((f), (p) o, (poJ to (p (x) = (-a2) (p () a b. (p 。()=( a 6.138) (-7.285 ) a 21.254, then a (p2 (23.461. a 9.985, a 21.501, a 15.617,0.984,mac makeup wholesale,22.66) (qo2, (p2) = Σ [(p2) ] = 1870_746.863, acetabulum = a 6,ed hardy shop wien, ((p0, (po) '(pl,' pIJ a -. Four s. The resulting fitted polynomial:) = (p. (x) + I ( p. (x) +: (p (x) 37.841 +0.387 r0.0782 ... ... ... ⑤ 3.2 Establishment of the cavity: the use of the style ... ⑤ as a thin-walled tube bending curvature of the guide line. to to a circle of radius r along the line I bow, export push the corner of the cavity shown in Figure 3: Figure 3 circular section tube bending groove curvature diagram = l1,rosetta stone wholesale, J0 a ~ c> + + JO one by one / II , J one by one / Variable Curvature Bending Process Simulation of the initial tube shape, its diameter D = l0ITIi'Ii, the thickness of t-1ITIITI, length L = 100ITIFfI, part bend radius R-30iTIFFI. take the temperature 20. c, pipe grid for the 2.5X10 units, the cavity between the tube and the friction coefficient of 0.002, Bending force 500KN, material for the AL, the elastic modulus E (GPa) 76, Poisson's ratio of nine to 0.33, elongation of 6 to 21.1%, yield strength 6o2 (GPa) 88, the ultimate strength of 6 (CPa) 206. In order to facilitate the finite element simulation of packing due to the assumption pressure uniformly act on the tube wall. tube bending process because of the yin and yang mode mode is not the main object of study, and their relative to the tube distortion is negligible, it can be assumed to be rigid to them, obtained through simulation Figure 5.a 'pupil circle of curvature b thin curved 4 boasts killed by Cao Tong Torreya boast circle into bite through the curvature (Figure 4b) and constant curvature (Fig. 4a) Bending CAE simulation: Setting mode bore trajectory curvature curvature changes from the 38ram 30ram, set the mold lag constant curvature trajectory curvature 30ram; set the same parameters above and the same step, the results of simulation experiments: comparison to take the same curved shape, constant curvature Bending strain is always greater than the curvature Bending strain, so a study curvature 【8】 meaning Bending Bending curvature and the feasibility study. Conclusion ① through the outer wall of the tube bending process of thinning, breakage of the analysis, In the traditional method, based on the obtained multiple regression method is more reasonable formula for calculating the amount of thinning; ② the goal to control the amount of thinning, bending pipe route design of the control points and derive the quadratic polynomial guide-line model with variable curvature, a l A mold of the model can be used as guide lines of different curvature of reference; ③ In this paper, the curvature of the curved guide wire to push the simulation model, simulation results show that the bending curvature can be pipe bending deformation increase. Fourth References: I11 Wu Shiyong, Shi Wei, Liuzhuang winding process on the wall thickness of pipe Numerical Analysis】 【J forging technology, 20o2, (1) :35-38f2I in Zongbao etc. industrial pipeline project 【M】 Chemical Industry Press, 2005 I () 2. 『3J Wang Hai, pipe plastic processing methods and techniques 【M】 Beijing: Mechanical Industry Press .1998.8.14 l Kou small thin-walled tube bending aluminum Paradise CNC bending radius of the experimental study 【M】 Northwestern Polytechnical University .2007,3. [slm Hongbin, pipe bending and deformation of non-core computing the measured value of forging technology, 1984,9 (1): 17 【6l (U.S.) Nawei Di (Navidi, W) with, Yangwen Jiang, Luo strong statistical translation of scientific and engineering applications ... 【M】. Beijing: Tsinghua University Press,ed hardy shop, 2 (3 (17.8 【7l Li, numerical analysis 【 ],[Science Foundation (Project Number: f ~ 5300 () 111) 2009 No. 5 (Total 97) MOULD & DIEPROJECT Die 1: Process 91

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