AL-Mg-Zn合金机器人WAAM制造工艺试验研究
毕业论文关键词 双脉冲 电弧增材制造 铝镁合金 气孔 微观组织 力学性能
Title Low frequency for Al-Mg alloy double pulse arc materialmanufacturing
Abstract Based on aluminum and magnesium alloy materials for research, this paper explorethe double pulse frequency influence on pile of apply the shape size andperformance, and find the suitable for aluminium magnesium alloy double pulseincreases material made in relatively good technical parameters.This experiment through the wire feeding speed and welding speed unchanged andchanges to the low frequency to explore low-frequency effects on double pulse arcincreasing material manufacturing. Through test, obtained the conclusion asfollows: the double pulse WAAM relatively stable arc, aluminium magnesium alloydouble pulse WAAM in manufacturing of 3Hz,7Hz and 9Hz frequency component ofstomatal tend to be lower, 0Hz, 1Hz and 5Hz is higher; 3Hz,5Hz scales grain widthsmaller and more beautiful. Layer height and width of all with the increase offrequency, deposited the height width ratio on frequency increases; Under 1Hz,3Hz,5Hz metal reinforcement than many, small grains more; Low frequency pulse tojoin the samples after the yield strength are increased, the elongation decreaseswith increasing frequency,3Hz,the manufacturing yield strength and tensilestrength is maximum;Transition part of the deposited layers were significantlylower than the hardness of deposited layer,the overall hardness value is lowerthan the single pulse and the trend is wavy,wave to 3Hz, the mean value of 75.38HV hardness. Comprehensive, pulse frequency 3Hz is the best pulse parameters forthe arc to add material manufacturing.
Keywords Double pulse arc additive manufacturing process Aluminum and magnesium alloys Porosity Microstructure Mechanical properties
目次
1绪论1
1.1研究背景及意义1
1.2电弧增材制造技术在国内外的研究状况3
1.3铝镁合金在制造上存在的问题4
1.4研究内容5
2AL-Mg-Zn合金机器人WAAM制造试验材料及设备7
2.1试验材料7
2.2试验设备7
2.3试验方法8
3低频频率与增材成型尺寸的关系工艺试验9
3.1双脉冲电弧增材制造的试验前准备9
3.2双脉冲电弧增材制造过程9
3.3不同频率下双脉冲电弧增材制构件的外观分析12
3.4低频频率对制造件尺寸的影响14
4低频频率对增材成型组织及力学性能的影响规律检测分析16
4.1不同频率下双脉冲电弧增材制造构件的显微组织特征16
4.2不同脉冲频率下双脉冲电弧构件的拉伸性能分析18
4.3不同脉冲频率下双脉冲电弧构件的显微硬度分析22
结论25
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