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Rectangular box drawing, the binder surface of the flange deformation and the corresponding sidewall load was non-uniform distribution of straight, curved edge material deformation uneven inflow velocity [1], deformation phenomena such as mutual restrain t by a number of molding conditions comprehensive influence on plastic deformation of the theoretical analysis, numerical calculation and the corresponding finite element simulation has caused great difficulties, the analysis of the deformation of the curved edge is far from sufficient. By actual drawing test results, the paper examines the phenomenon of deformation of the flange curved edge, deep in the Rectangular Box, a preliminary analysis of the stress and strain for the specific parts of the flange, in order to further understand and master the non-rotation symmetrical drawing deformation in real terms to provide some experimental analysis is based on.hydraulic hose end fittings
1 test conditions
Test material: thickness t0 = 0.2 mm of cold rolled copper sheet. Test mold: rectangle punch l × w = 36 mm × 72 mm, corner radius rc = 1 mm, 3 mm, 9 mm punch, the die shoulder fillet radius rp = rd = 1.5 mm, convex, concave mold gap of δ = 0.3 mm. Drawing test equipment: 500 kN single-action hydraulic press, forming speed of 0.3 mm / s. Pressing device: 63 MPa Hydraulic pump control four hydraulic cylinder to adjust synchronization binder, the top of the pressure p = 4 × 70 Mpa. Graphite mixture as a regular lubricant (about 2,000 drawing test is completed at the University of Nagoya, Japan Industrial Forming Research).
2 test analysis
2.1 flange curved outer edge of flow and deformation of the materialsplit flanges
Rectangular box deep drawing, the flange length, the short edge of the deformation rigidity different resistance to deformation of the curved edge. Therefore, to ease the effect of different material deformation in the curved edge. Flange outer edge of the deep dra wing process of rectangular boxes deformation measurement results are shown in Figure 1, the figure shows the increase with the stroke of drawing the line of symmetry of the slab corner is gradually shifted to the long side direction, and the angular radius rc more large, the greater the offset. By flange song, the long edge deformation area ratio:
Shows, rc greater the flange curved edge asymmetric pull deep deformation of the area is larger, that is, curved, straight edge of the deformation area ratio, so the curved edge material increase to squeeze into the amount of the straight edge. Although the angle of line of symmetry is offset to the long side, but according to the contrast between the inflow and absorption area shows the curved edge material into the greater impact on the short edge. Short squeeze into the curved side of the junction side to short side length of 1/3, there is a strong compressive force direction along the outer edge of weeks, and the thicknes s direction of the compressive force, so the short edge material to the die mouth The direction of the inflow resistance increased. Therefore, the punch shape parameter of rc / w, the greater the short side of the flange Ministry deformation intensified, weakened [2] to ease the effect of deformation in the curved edge, an impact on forming the edge of the limits to improve an important reason 2.2 flange song deformation tendency
Flange curved edge deformation around the rectangular box drawing formability, but the main direction of stress and strain due to the region with instantaneous changes of the drawing trip, makes it very difficult to deformation of the measured and calculated. In order to understand the state of deformation of the curved edge in the drawing, lithography etching method to carve the center of the punch angle for the center of concentric circles and radius lines in the slab, and then measured befor e and after deformation chord changes than s/s0 and the interval change of the concentric circles l/l0. Set the changes in deformation before the curved corners of the line of symmetry θ = 0 °, straight, curved edge boundary line for θ = 45 °, drawing stroke h = 9 mm l/l0 and s/s0
Near the mouth of the die, the direction of weeks and compressive deformation, rc the greater, the greater the deformation. However, the week to the location of compressive deformation is not symmetric in the corner line, but in straight, curved edges near the boundary line of the radius direction of tensile deformation of a larger location also straight, curved edges near the boundary line. This is due to the rapid flow of the die mouth, curved edge materials inevitably to the deformation resistance of the smaller straight edge to squeeze into the reasons caused by the material of forming straight edge. rc = 9 mm circumferential shrinkage deformation of the differenc e arising because of the location, although relatively small, but close to the die mouth, the angle symmetry line of the radial tensile deformation than the straight, curved edges near the boundary line is also small. In addition, the short, curved edges near the boundary line of the circumferential compression deformation and radial tensile deformation has emerged as a slightly larger than the long, curved edge at the junction of deformation tendencies.
2.3 flange angle strain analysis of the symmetry linestainless steel flange
Test results in the slab on the the lithography grid before and after deformation in cylindrical coordinates (r, θ) is the center of the punch angle for the center, press the approximate calculation of the angle symmetry line circumferential strain the εθ and radial strain
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