70年代末,我国开始引入国外的振动应力消除技术(VSR——Vibration Stress Releif),逐步应用在外形简单的中小型铸焊工件上,并且积累了一定的经验。但对外形和焊缝复杂的特大重型构件,用一般的VSR工艺难以达到消除应力的目的。 近年来,我们针对江苏冶金机械厂研制的6MN液压废钢冷剪机组中的重型、复杂结构件,研究出特殊新工艺,达到了理想效果,并于1988年通过部级鉴定。 In the late 1970s, China began to introduce abroad vibration stress relief technology (VSR - Vibration Stress Releif), and gradually applied to small and medium sized cast welding parts with simple shape, and accumulated some experience. However, the shape and weld complex large heavy components, with the general VSR process is difficult to achieve the purpose of stress relief. In recent years, we have designed special new technology for the heavy and complicated structural parts of 6MN Hydraulic Scrap Cold Shear Unit developed by Jiangsu Metallurgical Machinery Factory, and achieved the ideal result. In 1988, we passed the ministerial level appraisal.