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不锈钢-碳钢层合板经激光快速加热弯曲后,弯折区出现增厚现象。借助IPP图像处理软件测量各层厚度及碳钢层晶粒尺寸,基于温度梯度机理分析弯折区增厚机理及规律。研究结果表明:不锈钢层合板在加热过程中晶粒生长,尺寸增大,产生热膨胀增厚;正向弯曲过程中,晶粒在弯曲应力作用下挤压伸长,产生挤压增厚,在二者的共同作用下,板材厚度增加,且热膨胀增厚占主导地位。增厚现象主要出现在上层不锈钢及碳钢层,碳钢层增厚值所占比重大于69%。最后,研究功率、扫描速度、扫描次数、离焦量等能量参数对增厚值的影响规律,为提高激光弯曲精度与质量提供理论和实验依据。
Stainless steel - carbon steel laminate heated by laser rapid bending, the bending zone thickening phenomenon. With IPP image processing software to measure the thickness of each layer and the grain size of carbon steel layer, based on the temperature gradient mechanism analysis of bending thickening mechanism and law. The results show that the grain growth and the size increase during the heating process of the stainless steel laminate, resulting in thermal expansion and thickening. In the forward bending process, the grains are extruded and elongated under bending stress, Under the combined action of the two parties, the thickness of the sheet increases and the thermal expansion increases. Thickening occurs mainly in the upper stainless steel and carbon steel, carbon steel thickening value accounted for more than 69%. Finally, the influence laws of energy parameters such as power, scanning speed, scanning times and defocusing amount on the thickened value were studied, which provided theoretical and experimental basis for improving laser bending accuracy and quality.