韩彦龙, 王峰. 提高连杆大小孔中心线平行度的工艺改进及试验研究[J]. 制造技术与机床, 2022, (6): 134-139. DOI: 10.19287/j.mtmt.1005-2402.2022.06.021
引用本文: 韩彦龙, 王峰. 提高连杆大小孔中心线平行度的工艺改进及试验研究[J]. 制造技术与机床, 2022, (6): 134-139. DOI: 10.19287/j.mtmt.1005-2402.2022.06.021
HAN Yanlong, WANG Feng. Process improvement and experimental research on increasing the parallelism of large and small holes in the connecting rod[J]. Manufacturing Technology & Machine Tool, 2022, (6): 134-139. DOI: 10.19287/j.mtmt.1005-2402.2022.06.021
Citation: HAN Yanlong, WANG Feng. Process improvement and experimental research on increasing the parallelism of large and small holes in the connecting rod[J]. Manufacturing Technology & Machine Tool, 2022, (6): 134-139. DOI: 10.19287/j.mtmt.1005-2402.2022.06.021

提高连杆大小孔中心线平行度的工艺改进及试验研究

Process improvement and experimental research on increasing the parallelism of large and small holes in the connecting rod

  • 摘要: 基于某往复式压缩机连杆加工工艺流程,得出导致连杆大小孔中心线平行度差的主要因素。采用有限元法探究了精镗工序夹具压紧力最优值;依据数理统计理论,对定位面落差与精镗工序、珩磨工序大小孔中心线平行度关系进行了试验研究。结果表明:精镗工序压紧力最优值为3.5 MPa左右;不同落差分别对精镗工序和珩磨工序连杆大小孔中心线平行度有一定影响但影响趋势不统一,且落差为0或接近0时各工序大小孔中心线平行度均较佳。工艺改进方案为:精镗工序夹具压紧力由4.5 MPa降至3.5 MPa;精镗工序提高连杆大头端定位基准面25 μm,珩磨工序提高连杆小头端定位基准面18 μm;珩磨工序改用浮动珩磨夹具。经持续一年生产验证,同一生产线工艺改进方案下连杆大小孔中心线平行度合格率可提高约1%。

     

    Abstract: The main factors that lead to the poor parallelism of the center line of the connecting rod large and small holes are obtained based on the process flow of the connecting rod of a reciprocating compressor. The finite element method is used to explore the optimal value of the clamping force of the fine boring process. Based on the mathematical statistics theory, the relationship between the drop of the positioning surface and the parallelism of the center line of the large and small holes in the fine boring process and the honing process has been experimentally studied. The results show that the optimal clamping force of the fine boring process is about 3.5 MPa. The positioning surface drop has a certain influence on the parallelism of the connecting rod size and hole in the fine boring process and the honing process, but the influence trend is not uniform, and the drop is 0 or close to 0, the parallelism of large and small holes is the best. The process improvement plan as follows. The clamping force of the fixture in the fine boring process is reduced from 4.5 MPa to 3.5 MPa. The fine boring process increases the positioning reference surface of the large end of the connecting rod by 25 μm, and the honing process increases the positioning reference surface of the small end of the connecting rod by 18μm. Use a floating honing fixture of the honing process . After continuous production verification for one year, the pass rate of parallelism of the center line of connecting rod large and small holes under the same production line process improvement program can be increased by about 1%.

     

/

返回文章
返回