超声振动因子对镁合金单点渐进成形板材性能影响规律研究

Rules of performance impact of ultrasonic vibration factor to magnesium alloy sheet in single point incremental forming

摘要:

研究并掌握施加超声振动后镁合金板材在各成形参数下的成形规律,对解决温渐进成形带来材料受热不均、随着温度的改变润滑薄膜在局部高温下引起的粘着、模具强度和寿命随温度升高而降低等,完善镁合金超声振动单点渐进成形工艺有着重要的理论和实际应用价值。以方锥盒形件为研究对象,以最大剪切应力、减薄率和成形精度为指标,分析了不同参数：工具头尺寸、板厚和振幅对镁合金板材超声振动单点渐进成形性能的影响。结果表明：施加超声振动后,最大剪切应力和最大减薄率均有明显的降低,成形精度有明显的提高且在工具头直径D=10mm,板厚h=1.0~1.3mm内,振幅f=0.04mm,成形性能改善最为明显。

关键词:超声振动;渐进成形;减薄率;方锥盒形件

Abstract:

It is very important to research and master the rule of incremental forming of magnesium alloys carried on ultrasonic vibration under different process parameters for theoretical and practical application.This has significant value of theory and engineering application to solve the deficiencies,such as plate uneven heating and heating slower,along with the changing temperature of the lubricant film caused adhesion in partial higher temperature,along with the rising temperature of the mold strength and service life gradually reduce ect,and to improve the progress of the magnesium alloy plate ultrasonic vibration single point incremental forming.Take square pyramid box for research and the maximum shear stress,reduction ratio,forming accuracy as index to analysis the performance impact of different parameters to the magnesium alloy plate ultrasonic vibration single point incremental forming,such as the tool head size.the thickness and the amplitude. The result show that not only the maximum shear stress and the maximum reduction have been reduced but also the forming accuracy has been improved obviously after applying ultrasonic vibration.Also found that when the tool head diameter is 10mm,thickness from 1.0-1.3mm the amplitude is 0.04mm,it can improve the forming properties obviously.

Key words:ultrasonic vibration;single point incremental forming;reduction ratio;square pyramid box