共查询到18条相似文献,搜索用时 203 毫秒
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镁合金的冲压模具设计研究 总被引:1,自引:0,他引:1
本文以AZ31B镁合金手机外壳的冲压模具设计和在普通机械式锻压机床上的冲压生产为例,对AZ31B镁合金冲压成形过程中的板材制备、冲压模具设计、模具及板材的温度、冲压变形速度、润滑剂的选用等关键技术做了较为隶统的实验研究。实验表明.通过合理地选取模具参数并对拉深速度、坯料及模具温度等主要影响因素的控制,可有效地解决AZ31B镁合金拉深生产过程中的拉裂缺陷。在普通机械式锻压机床上能成功地冲压生产出镁合金手机外壳。 相似文献
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通过对异步轧制后的AZ31镁合金板材在杯突试验机上进行冲压试验,以此来研究AZ31镁合金板材的冲压性能.采用热轧态AZ31镁合金板材在异步轧机上进行不同压下率轧制,采取空冷,然后对单道次异步轧制后的板材进行退火处理.对退火处理后的板材切块、打磨,在杯突试验机上进行冲压试验,测量板材的杯突值,通过拉伸试验测得冲压性能指标... 相似文献
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研究了AZ31合金轧制过程中的组织演变及与室温拉伸性能的对应规律,探索了AZ31合金手机壳和笔记本电脑壳的冲压工艺.结果表明,经过多道次的轧制变形后,均匀化态的AZ31合金组织发生了动态再结晶,晶粒明显细化且呈等轴态,平均尺寸小于20 μm.厚度为2 mm和0.6 mm的AZ31合金板材室温拉伸强度对变形方向较敏感,延伸率也随着取样方向有所改变.在100~350℃下,利用厚度0.6 mm AZ31合金板材冲压出手机外壳和笔记本电脑外壳.经过EBSD分析表明,基面和棱柱面织构的存在导致了AZ31合金板材力学性能的各向异性. 相似文献
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《塑性工程学报》2019,(6)
为了探讨电流对材料成形性能的影响,建立了考虑温度影响的AZ31B镁合金流动应力模型及电场-温度场-变形场三场耦合有限元模型,分析了AZ31B镁合金板料在电流辅助拉伸变形中电流、温度和应变速率分布的关系,模拟了电流辅助拉伸和等温拉伸变形直至破裂的过程,研究了电流、温度和应变速率分布随拉伸变形的演化规律,并建立了AZ31B破裂应变与Z参数的关系式。结果表明:通电拉伸试样伸长率较等温拉伸时降低,这是由于通电拉伸时试样内温度分布不均导致变形局部化,但两者的破裂应变基本一致,该变形局部化对断面收缩率几乎没有影响,采用断面收缩率评价通电拉伸时材料的塑性更为合理。 相似文献
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AZ31镁合金板材温热冲压数值模拟与实验研究 总被引:9,自引:0,他引:9
采用Gleeble3500热模拟实验机进行了单向拉伸实验,分析了AZ31镁合金板材的力学性能;以此实验数据为基础,对温热冲压过程进行了数值模拟,研究了拉深温度、压边力等工艺因素对镁合金板材成形性能的影响;通过极限拉深比实验,对数值模拟结果进行了实验验证。结果表明:在极限拉深温度150℃,极限拉深速度15 mm/s,固定压边力的工艺条件下,极限拉深比能够达到2.5。模拟结果表明:模拟结果和实验结果具有良好的一致性;采用变压边力可以明显提高板材的冲压性能,极限拉深比将达到5.0。 相似文献
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Cold stamping formability of AZ31B magnesium alloy sheet undergoing repeated unidirectional bending process 总被引:2,自引:0,他引:2
Lei Zhang Guangsheng Huang Hua Zhang Bo Song 《Journal of Materials Processing Technology》2011,211(4):644-649
The repeated unidirectional bending (RUB) process was carried out on an AZ31B magnesium alloy in order to investigate its effects on the cold stamping formability. The limiting drawing ratio (LDR) of the RUB processed magnesium alloy sheet with an inclination of basal pole in the rolling direction can reach 1.5 at room temperature. It was also confirmed that cell phone housings can be stamped successfully in crank press using the RUB processed AZ31B magnesium alloy sheet. The improvement of the stamping formability at room temperature can be attributed to the texture modifications, which led to a lower yield strength, a larger fracture elongation, a smaller Lankford value (r-value) and a larger strain hardening exponent (n-value). 相似文献
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提出基于固体颗粒介质成形(SGMF)工艺的镁合金板材差温拉深工艺,并展开试验研究。通过对AZ31B镁合金薄板进行差温拉深成形试验,研究了成形温度、拉深速度、压边力、压边间隙、凹模圆角和润滑条件对拉深性能的影响,确定AZ31B镁合金板料最佳成形工艺参数。结果表明:该工艺可显著提高镁合金板材的成形性能,成形温度及拉深速度对板料拉深性能影响较大,板料最佳成形温度区间为290~310℃,颗粒介质与板料理想温差为110~150℃;压边力和压边间隙对拉深性能产生联合影响;此外,凹模圆角和润滑条件也对拉深性能有一定的影响。当上述工艺参数达到最佳值时成功拉深出极限拉深比(LDR)为2.41的工件。 相似文献
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Electric product house of magnesium alloy sheet is usually obtained by warm stamping owing to its poor plasticity and formability at room temperature. The formability of AZ31B magnesium alloy sheet can be improved by repeated unidirectional bending (RUB) process through control of (0002) basal texture. Compared with as-received sheet, the Erichsen value (IE) of the sheet underwent RUB process increases to 5.90 from 3.53 at room temperature. It is also confirmed that cell phone houses could be stamped successfully in crank press with AZ31B magnesium alloy sheets underwent RUB process. It provides an alternative to the electronics industry in the application of magnesium alloys. 相似文献
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Hua Zhang Guangsheng Huang Deqiang Kong Gaofeng Sang Bo Song 《Journal of Materials Processing Technology》2011,211(10):1575-1580
Repeated unidirectional bending (RUB) process was carried out to improve the texture of AZ31B magnesium alloy sheets. Influence of initial texture on formability of AZ31B magnesium alloy sheets at different temperatures was investigated. Compared with the as-received sheets, the limiting drawing ratio of the RUB processed sheets increased to 1.3 at room temperature, 1.5 at 50 °C and 1.7 at 100 °C, respectively. The improvement of the press formability at lower temperatures can be attributed to the texture modification, which led to a smaller Lankford value and a larger strain hardening exponent. However, the press formability of the sheet with a weakened basal texture has no advantage at higher temperature. This is due to much smaller r-value that results in severe thinning in thickness direction during the stamping process which is unfavorable to forming. Anyhow it is likely that the texture control has more effect on the press formability at lower temperature. 相似文献
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Xinsheng Huang Kazutaka Suzuki Akira Watazu Ichinori Shigematsu Naobumi Saito 《Journal of Alloys and Compounds》2009,470(1-2):263-268
The differential speed rolling (DSR) with a roll speed ratio of 1.167 was carried out on an AZ31B magnesium alloy in order to investigate its effects on the formability. Compared with the normal rolled sheet exhibiting approximately the same average grain size, the Erichsen values of the DSR processed sheet with an inclination of basal pole in the rolling direction significantly increased by about 1.5 and 1.9 times at room temperature and at 423 K, respectively. The deep-drawing temperature limit for a drawing ratio of 1.5 was also lowered from 443 K to 423 K. The improvement of the press formability at low temperatures can be attributed to the texture modifications, which led to a lower 0.2% proof stress, a larger uniform elongation, a smaller Lankford value and a larger strain hardening exponent. 相似文献
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Press forging of rectangular box of magnesium alloy AZ31 sheets was investigated at elevated temperatures.The characteristics of metal flow were analyzed on the basis of finite element method(FEM) and experiments.Effects of friction factor and sidewall thickness on metal flow and boss forming were investigated by FEM.The results indicate that the bosses and the sidewall of the rectangular box are formed unevenly due to the uneven flow of the metal.The increase in friction factor at die/sheet interface im... 相似文献
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在Gleeble-3500热模拟试验机上对AZ31B镁合金薄板(0.6 mm)拉伸试样在100~350℃的温度范围和1×10-1~1×10-3s-1的应变速率范围内进行了的单向拉伸实验,根据实验结果对AZ31B镁合金薄板的力学性能进行了分析.结果表明:AZ31B镁合金薄板在较低变形温度100~150℃时,应变速率对流动应力的影响不大;相比之下应变速率对AZ31B镁合金的断裂伸长率却有一定的影响,提高应变速率会降低材料的伸长率;在较高变形温度(200℃以上)时,应变速率对流动应力的影响比较明显,表现出显著的应变速率敏感性. 相似文献