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Microporous blanking technology

Tensile stress state, the thickness is slightly thinner. i can see from the above analysis I thin head the quality of the stamping process is mainly wrinkling, drum kits and pull thin crack. To ensure the quality of letters forming the first time stamping to be taken to discuss the quality control measures by the stress-strain state of the material is conducive to the forming head. '. A: ll, 0.2 _ thin seal stamping the first time quality control ', L. . II} under the extravagant size of 2.1, 1. . . . Look forward to head the size of the sizes of materials Xuan form of head-shaped mass size too small will head high enough, oversized head will cause the edge of wrinkling, the radial tensile stress generated by moving down that pole _ pass through a large force of friction Gu Mu. The ultra thin head twin Xi Respect and hardship caused by stripping only the sheet has been deformed removable bamboo mat moving ridicule addicted to hard time at the same time, the chain caused by wood warbler debate embroidery. Positive side must force l = y, then there is tension along the line of thin n-n or the risk of breakage. Figure 8, when punching, d. Reached the maximum time of 1.2 rounded part of the correct calculation of the die head of the sizes of materials. Actual production, first by theoretical formula (1) calculate the expected size of the next head, and then pressing the quality head after the amendment. To arrive at the appropriate sizes of materials. But this is too much trouble, through practice, to find simple and practical structure of two empirical formula (2), (3), calculated by the two heads of the sizes of materials is reasonable. Head sizes of materials in the formula: theoretical formula. Dp:, / / 1.38D. +4 D. (H + △) (1) empirical formula: when cold, Do: 1.2D-+2 Hall (2) NO. 3 When the total of 145 hot, Dp = 1.2Di +2 A S (3) where JD - head blank diameter JD. A head diameter △ Jl - trimming the amount of head JDf, h, s the meaning of that shown in Figure l. When WELDS 2.2 head diameter is larger, usually more than two or two made of steel plate welding, the weld groove at this time, internal quality, spliced form,ed hardy outlet, weld reinforcement, corresponding amount on the wrong side of the head a great influence on the forming quality. Poor control of these factors, such as occurs along the weld head pulled off, crack,abercrombie uk, from drum kits and other defects. In GB150 - 89 standard parts from the use of performance guarantee to consider these factors are clearly defined,ed hardy schuhe, but the press here from the head to ensure the quality of consideration, the form should also splice welds, weld reinforcement for special requirements, 2 .2.1 splicing form. In addition to meet the GB150 - 89 standards, it should also force the ring to weld smaller parts in stamping deformation (try to move closer to the rough center), which can prevent severe deformation of the weld area in the head while the crack ,ed hardy suomessa, pull off the defect. Welding seam itself because there is stress, coupled with inconsistent welding consumables and base metal, non-uniform deformation, it is easy to pull in the crack, pull off, this time in the cold, in particular. Specific splicing form of Figure 4. Figure 4 Figure 5 form the first splice plate weld reinforcement on the quality of 2.3 head sheet metal sheet heated situation head defects common heating,mac cosmetics discount, uneven heating and oxidation. Coal-fired furnace, in order to ensure the heating head sheet metal quality, adopted the following control measures. (1) the quality t of coal requirements of high heat and impurity content (especially the other 8 are S) less I · (2) in a micro-furnace atmosphere so that the oxidation state I (3) heating time. As short as possible to reduce the oxidation time. The method is the use of high temperature (carbon steel, low alloy steel for the 806 ~ - 850 ℃, austenitic stainless steel 9o ~ ~ 95o ℃) into the furnace heating. One. (4), furnace installed so that each charge ¨ snapped in half an hour ● Pressure finished. (5) l heating process in strict accordance with Figure 6 for heating the heating curve in order to ensure uniform heating sheet. (6) loading mode. Layer between the plates away from the general requirements of not less than 12om =, supporting votes rate stability and reliable, so that the minimum deformation of the heating plate for easy furnace gas flow. Before the above measures can be heated bowls ensure the quality of the sheet metal to conform stamping requirements. Figure 6 head sheet metal heating process curve tI - installed after the heat when the furnace j field, divided by 1 / ∞. When calculating t --- 』same temperature, the maximum power calculated by the stove t. - Beginning red when the same temperature insulation, for 1 minute / blood m2.4 size BHF 2.2.2 weld reinforcement stress and strain analysis from the previous notice: for the BHF blank holder range, rough welds should be polished to prevent the sheet with the use of wrinkling or bulging. Flush the actual production of base metal, weld reinforcement <0.5ram. It will be very content, the use of a blank drawing pad method (see easy to make the head appear drum kits, elongated defects, shown in Figure 5. thin

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