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<table cellpadding="3" cellspacing="0" width="100%" class="forumline"> <thead> <caption><table border="0" cellspacing="0" cellpadding="0" width="100%" class="forumheader"> <tr> <td align="left" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_left.gif" width="25" height="27" alt="" /></td> <td align="center" class="forumheader-mid">Topic review</td> <td align="right" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_right.gif" width="25" height="27" alt="" /></td> </tr></table></caption> </thead> <tbody> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>lompiacv</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/AcidTechTiger/images/post_old.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Wed 15:32, 12 Jan 2011<span class="gen"> </span> Post subject: ugg italia Bumper column forming and springback an</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Bumper forming and springback analysis and control column <br /> <br /> <br />Part shape error after springback is to meet the requirements, if not met, the rebound values through the amount of correction to the mold shape, and then use the modified mold the face of forming and springback analysis of the parts, and then determine the part springback After the error is shaped to meet the requirements. Such as to meet the requirements,<a href="http://www.stivaliuggitalia.org" target="_blank">ugg italia</a>, then stop the analysis, the output data mold surface; if still can not meet the design requirements, the amendment to the mold surface and then continue until the satisfactory results obtained so far. Rebound Control 3.2 bumper column iteration through simulation of the mold surface with Displace-mentAdjustment method of compensation, Figure 6 for the first iteration of compensation calculations, can be seen from Figure 6, the mold surface springback compensation maximum value of 2.1mm, after 3 iterations, the bumper column cloud after springback is shown in Figure 7, the figure shows the parts in the y direction of the rebound values of the ± 0.4mm room, and the part the required tolerance range of ± 0.7mm, part of the rebound is controlled in a reasonable range, so the simulation of the springback compensation used in the mold surface of the mold surface is required. 2O864208642O22lllllOOOO0 1 Zhoujie Deng: Bumper column forming and springback analysis and control 69 / compensation of touch with the surface / /. 1 rebound after the piece shape /} initial die surface I Figure 6 after the 1st iteration of compensation calculations Fig. 6CompensationresultafterthefirstiterativeSPBK0lSTEP21'IME: O. 002290COMPONENT: y-displacement map after 73 iterations of the rebound to the cloud part y Fig. 7ContourofspringbackinYdirectionafterthethirditerative4 test and verification test equipment used in YA32-315, parts and materials for high-strength steel SPH440,<a href="http://www.stivaliuggitalia.org" target="_blank">stivali ugg</a>, material thickness 1.6ram, blank shown in Figure 8, the size through the eta / DYNAFORM exhibition features initially been expected, and then get through the fine-tuning precise billet size,<a href="http://www.stivaliuggitalia.org" target="_blank">ugg milano</a>, lubricating oil as an ordinary. Figure 8 stock used in the experiments Fig. 8Testblank will produce parts and submit the following comparison. Figure 9 and Figure 1O, by measuring, parts location and submit the front wall of the largest difference between the value of 0.1mm, part out rebound, part wall and submit the difference between back-end part of the largest value of 0.55rnm, part out rebound, and the simulation results are basically close to the maximum error value is 23, can be seen,<a href="http://www.monclerjackens.net" target="_blank">moncler günstig</a>, the numerical simulation and the mold surface correction method for a virtual test mode, you can aim to control the rebound. Cost savings and shorten the molding cycle. Figure 9 Real part Fig. 9Productofbumperpillar Figure 1O part inspection Fig. 10Themeasurementofpart5 Conclusion The rebound of the current situation, the finite element simulation of bending the bumper bar column pressure rebound after analysis and study, the qualified product. 1) column on the bumper of the analysis part of the process, forming solutions may be obtained,<a href="http://www.monclerjackens.net" target="_blank">Moncler online</a>, and these programs are compared to determine a reasonable shape program. 2) the establishment of the bumper column finite element model of forming, the use of explicit / implicit method for the joint solution, the column was forming on the bumper and rebound analysis, coefficient of friction, die gap and other parameters of its springback studied. 3) Optimization of process parameters in the selection, based on the compensation method with the mold surface of the rebound bumper column to control the size of the control product within the allowable range. References [1] Zhong-Qin Lin. Auto Body Parts Drawing Simulation [M]. Beijing: Mechanical Industry Press, 2005.1 [2] Cui order river. Automotive Stamping Technology [M]. Beijing: China Machine Press. 2003.6 [3] Liu Di Hui. Simulation of cell size on the impact mechanism of rebound [J]. Plasticity Engineering, 2007.14 (2) :94-96 [4] Ray is Paul. Automotive Stamping CAE technology [M]. Changsha: National Defense University Press, 2003 [5] Zhou Yu. Automotive Stamping Springback of CAE [J]. Automotive technology. 2005. 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