The basic shape of the deep drawing parts common development and application of test equipment Flow, so as to achieve the purpose of regulating the BHF. In this paper, power supply,adidas climacool hose, slide-wire rheostat circuit and multimeter to adjust the composition of the different power values. BHF control system shown in Figure 3. Rainbow w, Jj ∞ Yi Pao DC power management products is busy {H 3 BHF control system diagram is well known, deep drawing process the deformation zone prone to wrinkling phenomenon, currently the most extensive and effective prevention measures is set blank holder. Blank device is reasonable and effective, the key is the size of the blank holder force is appropriate. BHF is too small to resist wrinkling instability trends; BHF is too large,adidas climacool, in vain contributed to a dangerous section of the rupture. Visible BHF deep-drawing process is a very important process parameters. As in the drawing process, wrinkling instability trend is different. In the beginning stages of drawing,adidas climacool chill, the trend of increasing wrinkles, BHF power should be gradually increased since then, the trend of reduced wrinkling instability,adidas la trainer, BHF should be reduced accordingly, we can see almost the ideal platform BHF should be change. To this end, wrinkle-free blank holder force,adidas climacool schuhe, subject to the critical wrinkling conditions, should be to ensure the premise of rough do not wrinkle, select the value as small as possible. However, drawing sheet,adidas neo, the corresponding limits on the investment does not wrinkle deformation is generally small, in this case if a single degree of deformation as a sheet forming limit, you can not truly reflect the limits of plate deformation. To this end, the production of wrinkle preventive measures to stabilize the deformation process to proceed, in order to play the buried plate deformation inherent ability. Therefore, to set the appropriate size of the blank holder force, in order to fully reflect the board's Crossing - Apartments shed for cattle cross ● a salary limit of deformation, the need to pull the material by the deep drawing process of carrying capacity constraints. Towel sheet deep drawing process to ensure its smooth shape is a necessary condition for the maximum drawing force f should be small risk of rupture of the carrying capacity of cross-section,adidas online shop, therefore, determines the maximum allowable value of BHF. As the ultimate bearing capacity by plate material properties, like dangerous broken and nervous stress and deformation effects such as, in general, it is also changing during the forming process, and therefore, the maximum allowed value of BHF forming process in the whole should also be constantly changing. In summary we can see, in the deep drawing process,adidas schuhe, the critical condition of wrinkling and ultimate bearing capacity are necessary to determine the minimum and maximum allowed BHF BHF, and in the deep drawing process are changing. Can be seen, the pressure side of the existing equipment to provide such changes BHF is very difficult. Therefore, the existing devices to achieve BHF and changes in the regulation of exercise for in-depth study of Latin shape the law, is of great significance. This installation of the BHF-conditioning system, you can easily adjust the value of different BHF, which in the deep drawing process for the realization of the changing BHF, so forming conditions become more units to provide a reasonable basis. Fifth, the device operating characteristics of the device die size of the design: the axisymmetric part Dd = 160mm ~ For the most part non-axisymmetric die lip length L = 160mmc Figure 4 Calibration of the current relationship with BHF Figure made on the device resistance strain gauge pasted drawing force and blank holder force sensor operating range is 0 ~ 200kN respectively, and 0 - 250kN. 50 used a type of LVDT displacement sensor operating range of 0 - 100mm. According to the operating characteristics of the electromagnetic proportional pressure relief valve and pressure side of the scope of work force sensor, the device blank holder force is adjustable from 20 ~ 250kN. From the design of the die size point of view, this range of pressure and powerful enough to meet the requirements. Figure 4 shows the calibration of the device and the current value of BHF relationship. Six, the application of this choice of diameters D = 64,96,128 (mm) punch in the device on a drawing test. Test material for the 08AI steel, rough size Dn = 250mm, top cone diameter = D / Dd, deep drawing power of a stroke on the impact of the relationship can be seen in certain BHF, when K more hours, the smaller the required drawing force and drawing to a certain height after the break, this time mainly to bulging deformation when K is large, that is gradually drawing closer to the cylinder-shaped parts, the larger the required drawing force, this time to the main drawing deformation. and from the Figure 5 can be seen, cylindrical parts spare parts easily than conical shape, visible, cylindrical and conical parts there is an intrinsic link between the parts shown in Figure 5 relative to the top cone diameter of the impact force on the drawing shown in Figure 6 a K = 0.6, different BHF BHF deep-drawing power of a stroke on the impact of the relationship can be seen, the greater the blank holder force, required drawing force is also greater. (continued on page 37) 27 相关的主题文章： 2005.1-4\] Lu into water-soluble> 10% fully meet Taiwan QSTTIl5 a pair _ 9 = 16-230 the right combination of punch and die clearance of its single its convex surface