精密成形工程
精密成形工程
정밀성형공정
METAL FORMING TECHNOLOGY
2014年
6期
46-51
,共6页
AZ31 镁合金%自阻加热%超塑成形%电子风力
AZ31 鎂閤金%自阻加熱%超塑成形%電子風力
AZ31 미합금%자조가열%초소성형%전자풍력
AZ31 magnesium alloy%resistance heating%superplastic forming%electron wind force
目的：为提高镁合金板材超塑成形加热过程的效率，将自阻加热引入到超塑成形过程中。方法通过自阻加热实验，分析了电流密度对坯料温度及升温速率的影响；设计了自阻加热胀形装置并确定了工艺参数，实现了 AZ31镁合金的自阻加热超塑胀形。结果采用该加热方式可将坯料加热时间从数十分钟缩短至几十秒，极大地提高了加热速率，降低了能耗。结论分析了在电流作用下镁合金的变形机制，发现电流可以通过促进材料的再结晶形核、位错滑移来提高材料塑性，并具有钝化和阻碍空洞扩展的作用。
目的：為提高鎂閤金闆材超塑成形加熱過程的效率，將自阻加熱引入到超塑成形過程中。方法通過自阻加熱實驗，分析瞭電流密度對坯料溫度及升溫速率的影響；設計瞭自阻加熱脹形裝置併確定瞭工藝參數，實現瞭 AZ31鎂閤金的自阻加熱超塑脹形。結果採用該加熱方式可將坯料加熱時間從數十分鐘縮短至幾十秒，極大地提高瞭加熱速率，降低瞭能耗。結論分析瞭在電流作用下鎂閤金的變形機製，髮現電流可以通過促進材料的再結晶形覈、位錯滑移來提高材料塑性，併具有鈍化和阻礙空洞擴展的作用。
목적：위제고미합금판재초소성형가열과정적효솔，장자조가열인입도초소성형과정중。방법통과자조가열실험，분석료전류밀도대배료온도급승온속솔적영향；설계료자조가열창형장치병학정료공예삼수，실현료 AZ31미합금적자조가열초소창형。결과채용해가열방식가장배료가열시간종수십분종축단지궤십초，겁대지제고료가열속솔，강저료능모。결론분석료재전류작용하미합금적변형궤제，발현전류가이통과촉진재료적재결정형핵、위착활이래제고재료소성，병구유둔화화조애공동확전적작용。
Objective In order to save energy and improve efficiency, the current is adopted in superplastic forming process. Methods Through resistance heating experiments, the influence of current density on temperature of sheet and heating rate is analyzed. By the design of the forming apparatus and determination of the technology parameters, the resist-ance heating forming is realized. Rsults The results show that, resistance heating can reduce heat-up time from dozens of minutes to dozens of seconds, which greatly improves the heating efficiency and reduces energy consumption. Conclusion The deformation mechanism with the action of current is discussed. It is found that the current can promote recrystallization-nu-cleation and dislocations slipping and hinder the growth and join of cavities, that all improve the plastic property of material.
