tory burch flats Sheet metal friction coefficient

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Sheet metal friction coefficient of limit drawing

OLOGYY20 №. 3200 \In fact, the sheet metal drawing, the friction is a duality. From the reduction in the deep drawing process of sheet metal in the friction loss and reduce the cylinder wall, the burden of force transfer zone of view, part of the upper and lower surface of the flange and die lubricant to reduce friction between the use is beneficial, it helps to improve drawing deformation; the other hand, increase the risk of cross-section strength, reduce the burden of risk of cross-section view, in the punch and greater friction between the cylinder wall, help to improve drawing skills. Therefore, when drawing in between the punch and the cylinder wall lubrication should not be coated with thorns. However, due to the punch worn smooth, this effect is difficult to maintain. Also, when drawing the sheet flange part is the main deformation zone, this part of the friction on the drawing performance is greater than the cylinder wall and bottom of the fillet, and are therefore, on the whole,[link widoczny dla zalogowanych], reducing the friction on sheet Drawing is advantageous, therefore in the drawing process, in ensuring the wall and bottom of the fillet simply do not break down under the premise should be to minimize friction also can be seen from Figure 2, the plastic limit drawing coefficient of normal anisotropy parameters with R, increases. Deep drawing, from the perspective deformation, R is greater that flange more prone to deformation, is conducive to deep drawing; In addition, when drawing, drawing parts at the same time thinning the bottom corner, when the plate R value is large, difficult to thin the thickness of the material, which is also conducive to deep drawing on the other hand, from the perspective of deformation resistance, the flange deformation zone, R is larger, the deformation resistance decreases, is conducive to the flange deformation so that the flange wrinkling is not easy; and the cylinder wall and bottom of the fillet, R value is large, the deformation resistance increases, the tube wall and the bottom of the fillet at the strength, deformation degree increase above 5 Conclusion Analysis can be concluded that (1) Jane and the flange deformation zone is assumed to be flat wall deformation, the limit proposed by drawing the relationship between friction coefficient and the theoretical formula. (2) limiting drawing coefficient with the increase of friction coefficient, with the thick plastic anisotropy parameter R, Sheng decreases (3) the use of formula (13) obtained at different R conditions, the limit drawing coefficient and the actual production there are some differences, because one does not consider in solving m convex, rounded at the bend die, the reverse bending and friction power consumption; the other hand, using formula (13) used when solving the R m value is obtained from the uniaxial tension. And assuming the same sex within the sheet surface, anisotropy, however, when drawing sheet stress-strain state of deformation zone is much more complex than simple tension, but also to the opposite sex is not just thick. In addition, friction does not take into account the assumptions and the cylinder wall and bottom of the fillet is the friction at the cause of the error. However, although the actual calculation error, the actual production still can be used as the reference. Because in actual production,[link widoczny dla zalogowanych], far from all cases used in the limit drawing factor, because it is too close to the limit drawing coefficient tends to wrinkle or crack sheet, thus affecting the quality of drawing parts. Therefore, a higher part quality requirements, must be slightly larger than a limit of drawing coefficient [References] [I: Liang Bingwen. Hu Shiguang. Sheet metal forming plasticity: M] Beijing: Machine Industry Press maple. 1987.505-511 [2] Xiaojing Rong Jiang Kuihua stamping technology [M. . Beijing: China Machine Press. 1994.79-81 [3] Li Shuo this. Stamping technology [M] Beijing: China Machine out of Gui-social. 1,982,110 a II3 [4] Yu-Ying Yang Large sheet metal forming technology M] Beijing: National Defence Industry Press. 1996.63-66 [5: Zhang Rongqing ironing when the friction of the amendment [J] Mechanical Engineering. 1998. (I) :50-52 missiles with a radial friction welding technology Research Institute of China Ordnance Industry fifty nine developed \Continuous drive friction welding,[link widoczny dla zalogowanych], and other technology and small batch production of special friction welding machine: the technology has unparalleled advantages: high quality, efficient,[link widoczny dla zalogowanych], energy saving, environmental protection; Peter narrow heat affected less than {03mn). Grain refinement joints after welding without any treatment,[link widoczny dla zalogowanych], process is simple and practical; with the traditional mechanical pressure compared to embedded assembly technology, the use of friction welding technology eliminates the need slotted knurled to reduce the workload and improve the welding body Building Structure Design oyster processing technology, increased intensity of welding products. The technology of friendship in the weapons manufacturing of high value, set in the aerospace, energy, marine, oil pipelines, marine development and other fields. As well as automotive, machinery and other related fields have a very wide range of applications: f Wang Yan)
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