Y.Tsunekawa
,
S.Tamura
,
M.Okumiya
,
N.Ishihara
材料科学技术（英文）
Hot-dip coating has been practically employed in manufacturing zinc alloy coated steel sheets. However, it is difficult to coat aluminum alloy on a bulky steel substrate without sufficient preheating, because a rapidly solidified layer containing gas babbles is formed on a substrate surface. A variety of iron-aluminides are also formed at the interface of a steel and aluminum hot-dip coating system, which is the main difficulty in joining of steel with aluminum. Ultrasonic vibration was applied to a steel substrate during hot-dip coating of aluminum alloy to control a rapidly solidified layer and a brittle reaction layer. Hot dipping of columnar steel substrates into molten aluminum alloy (Al-2.7 mass fraction Si-4.6 mass fraction Sn) was carried out through the use of a Langevin oscillator with resonant frequency of 19.5 kHz. The application of ultrasonic vibration is quite effective to control a rapidly solidified layer and a surface oxide layer from a substrate surface by the sonocapillary effect based on a cavitation phenomenon, so that the intimate contact is achieved at the beginning of hot-dip coating. The application of ultrasonic vibration to hot-dipping is effective to control a reaction layer with less than 5 μm in thickness. An impact test exhibits that the good adhesive strength is approved in hot-dipped aluminum coatings with a thin reaction layer of approximately 5 μm.
关键词:
Ultrasonic vibration
,
null
,
null
,
null
赵波
,
刘折
,
郑友益
,
卞平艳
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.04.005
以ELID电解原理为基础,结合超声振动辅助磨削过程中单颗磨粒的运动学分析,建立了超声ELID复合磨削条件下的磨削力数学解析模型,并对模型进行了分析和仿真.对模型的分析表明:超声振动改变了磨粒的运动轨迹,使同等条件下的未变形切屑厚度减小,砂轮的在线电解修整使磨粒始终处于锋锐状态,而且影响砂轮的实际切削深度,进而对磨削力产生影响.磨削力随着超声振动频率、振幅、电解电压、脉冲比、电解液电阻率的增大而减小;随着切削深度、工件速度的增大而增大.
关键词:
磨削
,
超声振动
,
ELID
,
磨削力
,
模型
