金属薄板超声微拉伸性能测试

发布时间：2018-06-26 05:30

本文选题：超声 + T2紫铜薄板　；参考：《深圳大学》2015年硕士论文

【摘要】：宏观大尺寸金属板料制件成形过程中,利用超声来降低坯料与模具间的摩擦,提高板料成形极限,已获得广泛应用。而在微成形中,将超声应用于金属薄板的成形,目前还少有报道。本文结合课题组发明的超声柔性冲头金属板料微成形技术的需要,开展金属薄板超声力学性能研究,为金属薄板的微成形提供材料的基础力学性能参数,以弥补目前金属薄板超声力学性能数据的短缺,为超声金属薄板微成形奠定必要的基础。本文在常规拉伸实验设备的基础上,通过设计适合的超声装置,将超声附加到T2紫铜薄板上,以实现超声环境下金属薄板的力学性能测试。由于金属薄板超声微拉伸力学性能测试在现阶段尚难找到可资借鉴的资料,因此金属薄板超声拉伸实验面临许多困难。本文旨在解决金属薄板超声拉伸过程中所出现的一些问题,以通过拉伸实验来获得金属薄板在超声振动下独有的力学性能。本文主要工作如下:1、选用厚度0.1 mm和0.05 mm的T2紫铜薄板材料作为实验材料,通过不同参数的退火处理,获得不同晶粒尺寸以及不同厚度/晶粒尺寸比的金属薄板受试材料。2、根据实验需要和超声拉伸的特性,设计特殊形状的拉伸试样并确定出拉伸试样合适的尺寸。在超声拉伸实验过程中,根据出现的问题不断进行修改,使其能获得超声拉伸的力学性能参数。3、首先利用市面上容易获得的D1型超声洁牙机作为超声发生装置,向受试材料试样施加横向超声,初步了解金属薄板在超声振动下进行拉伸可能遇到的问题,同时观察超声振动对试样材料力学性能的影响,为研制专用的超声拉伸装置奠定一定基础。4、研制专用的纵向超声微拉伸实验装置及配套的夹具,进行纵向超声微拉伸实验,观察纵向超声对试样材料力学性能的影响,并比较横向超声和纵向超声对金属薄板力学性能影响的异同。
[Abstract]:It has been widely used to reduce the friction between blank and die and to improve the forming limit of sheet metal in macroscopical large size sheet metal forming process. However, there are few reports on ultrasonic application in metal sheet forming. In this paper, the ultrasonic mechanical properties of sheet metal are studied according to the need of ultrasonic flexible punching metal sheet microforming technology, which provides the basic mechanical properties of the material for the sheet metal microforming. In order to make up for the shortage of ultrasonic mechanical properties of metal sheet at present, it lays a necessary foundation for ultrasonic sheet metal microforming. In this paper, on the basis of the conventional tensile test equipment, a suitable ultrasonic device is designed to attach the ultrasonic to the T2 copper sheet, so as to realize the mechanical properties of the metal sheet under the ultrasonic environment. Due to the fact that it is difficult to find the reference data for the testing of ultrasonic microtensile mechanical properties of metal sheet at this stage, the ultrasonic tensile test of metal sheet is faced with many difficulties. The purpose of this paper is to solve some problems in the process of ultrasonic stretching of metal thin plates, and to obtain the unique mechanical properties of metal thin plates under ultrasonic vibration through tensile experiments. The main work of this paper is as follows: 1. The T2 copper sheet material with thickness of 0.1 mm and 0.05 mm is selected as the experimental material and annealed with different parameters. Different grain sizes and different thickness / grain size ratios were obtained. According to the experimental requirements and ultrasonic tensile characteristics, a special shape tensile specimen was designed and the appropriate size of the tensile specimen was determined. In the process of ultrasonic stretching experiment, according to the existing problems, the mechanical properties of ultrasonic stretching can be obtained by constantly modifying it. Firstly, the D1 ultrasonic tooth cleaning machine, which is easily available in the market, is used as the ultrasonic generating device. By applying transverse ultrasound to the specimen of the tested material, the problems that may be encountered in the tensile of the metal sheet under ultrasonic vibration are preliminarily understood, and the influence of ultrasonic vibration on the mechanical properties of the specimen is observed. In order to establish a certain foundation for the development of a special ultrasonic stretching device, a special longitudinal ultrasonic micro-stretching experimental device and its supporting fixture were developed, and the effects of longitudinal ultrasound on the mechanical properties of the sample were observed. The effects of transverse ultrasound and longitudinal ultrasound on the mechanical properties of metal sheet were compared.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG115.5

【参考文献】