丝杠系预拉伸力的综合分析计算和探讨

发布时间：2019-07-23 12:13

【摘要】：丝杠传动系统是数控机床的关键部分之一,针对单推-单推和双推-单推支承型式丝杠传动系统的预拉伸力计算和确定问题,通过分析认证,指出现行的结论存在以下不足和缺陷:在只考虑轴向负载因素时确定的预拉伸力在一般情况下过大;以及没有给出综合考虑最大轴向负载和热伸长变形两种主要因素时的预拉伸力计算和确定方法,或只按照热变形补偿方式而计算和确定预拉伸力,所得出的计算结果和结论具有局限性、不合理性和不完整性。为克服这些不足和缺陷,综合考虑上述两种主要影响因素,对双端固定丝杠系的受力和变形进行了分析,引入一个新的技术参量——临界预拉伸力,推导出丝杠系的综合临界预拉伸力方程及其解法;并考虑轴承最小载荷要求,同时根据实际应用状况进行系数修正,给出了最终预拉伸力的表达式,讨论了修正系数的选择原则和方法,使预拉伸力的计算和确定方法明确、合理、符合实际。对计算方法进行试验验证,显示了其合理性。
[Abstract]:Screw transmission system is one of the key parts of CNC machine tools. Aiming at the calculation and determination of pretensile force of single push-single push and double push-single push support type screw transmission system, through analysis and certification, it is pointed out that the current conclusion has the following shortcomings and defects: when only considering the axial load factor, the pre-tensile force determined is too large in general; The calculation and determination method of pretensile force is not given when the two main factors of maximum axial load and thermal extension deformation are considered synthetically, or the pretensile force is calculated and determined only according to the compensation mode of thermal deformation. The calculated results and conclusions are limited, unreasonable and incomplete. In order to overcome these shortcomings and defects, considering the above two main influencing factors, the force and deformation of the double-ended fixed screw system are analyzed. A new technical parameter, the critical pretension force, is introduced, and the comprehensive critical pretension force equation and its solution of the wire bar system are derived. Considering the minimum load requirement of the bearing and modifying the coefficient according to the practical application condition, the expression of the final pretension force is given, and the selection principle and method of the correction coefficient are discussed, so that the calculation and determination method of the pretension force is clear, reasonable and in line with the reality. The calculation method is verified by experiments and shows its rationality.
【作者单位】：桂林广陆数字测控股份有限公司;广西科技大学鹿山学院;广西科技大学工程训练中心;广西大学机械工程学院;
【基金】：广西科学研究与技术开发(桂科攻1598008-26)资助项目
【分类号】：TG659

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