曲轴偏置机构原理在钢板滚切剪机设计中的应用

以空间七连杆滚切剪机运动轨迹方程为基础，采用某公司2800mm的曲轴偏置新型结构的单轴双偏心定尺滚切剪为研究对象。对曲轴偏置前后及不同偏置量的钢板剪切力、连杆力、保持剪刃间隙恒定的后滑道推力进行了分析对比。发现采用曲轴偏置后，在前曲柄提刀时刻机构仍然能够保持足够大的后滑道推力，机构在采用60mm-100mm的偏移量时后滑道压力同侧向力最接近平衡。理论分析结果及现场钢板剪切质量表明曲轴偏置机构在保持剪架在剪切过程中平稳，保证剪刃间隙恒定发挥了重要作用。

Application of Offset Mechanism of Crankshaft in Rolling-type Heavy Steel Shear

Based on movement path equation of spatial seven-bar linkage rolling shear, a new structure of 2 800 mm rolling-cut shear with such features of crankshaft as single-shaft and double-eccentricity from some Iron＆Steel Company as research subject, Shear force and bar force of steel plate, before and after adoption of asymmetry and negative offset structures, are analyzed, as well as horizontal force component of mechanism that influences pure rolling shear and back-wall push force that keeps blade clearance. Moreover, the maximum horizontal force component at rolling start-up （ i. e. the time that the maximum rolling shear produces）, back-wall push force at the time that crank lifts blade, are respectively discussed in detail. Discoveries are that the horizontal force component, which influences pure roiling at rolling shear period,is dramatically decreased, and there still exists enough back-wall push force in mechanism as the front crank lifts blade. Theoretical results and on-site shear quality both indicate that new structural features such as asymmetry and negative offset play an important role in ensuring pure rolling shear and keeping blade clearance constant, which provide an effective means to improve quality of steel plate.