摘要
为了实现异形螺杆转子在数控螺杆转子磨床SK7032的磨削加工,并对螺杆转子的磨削精度进行评测,提出了一种分段的计算机数控(CNC)砂轮修整方法和确定分段间隔的方法。依据砂轮回转面与被磨削螺杆转子螺旋面的相切条件,推导了二者的空间接触线方程,用接触线方程计算了磨削螺杆转子所需的砂轮截型。采用不同的安装角和中心距对同一螺杆转子型线所对应的砂轮截型进行计算,计算结果对比表明,安装角是机床的敏感参数,中心距变化1mm引起的砂轮截形误差小于1μm。由此也得到了分段CNC砂轮修整方法所对应的合理分段计算间隔,即相邻两次计算砂轮截型的中心距差值应小于1mm。将某型螺杆空压机的阴转子在SK7032转子磨床上进行磨削,磨削后的转子型线检测结果显示:与理论型线相比,采用分段的CNC砂轮修整方法磨削后的型线误差在±10μm以内。该研究可为SK7032数控螺杆转子磨床的功能实现和螺杆转子的磨削提供参考。
To grind special-shaped screw rotor and evaluate the grinding precision of rotor ground, a method of segmented computer numerical control （CNC） grinding wheel dressing is proposed, and the segmented interval determining scheme is given. According to the tangent condition between grinding wheel surface and rotor helical surface, the contact line equation is deduced. The grinding wheel profile can be calculated by the condition line equation and rotor profile. Several grinding wheel profiles are obtained by different installation angle and center distance on the same rotor profile. The results show that the installation angle is a sensitive parameter and the error within 1 ~m results from changed center distance of 1 mm. The reasonable center distance interval of segmented CNC grinding wheel dressing method ought to be less than 1 mm. The test is carried out on a SK7032 grinder for a female rotor, and the machining error can be controlled within ± 10 〉μm with the method of grinding wheel segmented dressing.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2016年第8期6-14,共9页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51305378)
陕西省科学技术研究发展计划工业攻关计划资助项目(2014k06-45)
关键词
螺杆压缩机
螺杆泵
螺杆转子
转子磨削
screw compressor
screw pump
screw rotor
screw rotor grinding
