安全阀阀座与阀瓣研磨修复工艺实验研究

Grind and Repair Process Experiment of Safety Valve Seat and Valve Disc

目的为满足安全阀阀座与阀瓣配合面密封要求,提高安全阀密封面磨削修复质量和效率,阀座和阀瓣表面粗糙度Ra≤0.1μm。方法在正交实验的基础上,采用Al_2O_3砂纸、白刚玉研磨膏为磨削介质,研究了磨粒细度、磨削时间、磨削转速、磨削压力对密封表面粗糙度和磨削量的影响,使用粗糙度测量仪、千分尺、电子显微镜对阀座和阀瓣的表面粗糙度、磨削量、表面形貌进行测量分析。以磨削量和表面粗糙度为评价指标,得到最佳工艺参数,并通过多组重复性实验验证实验结果的可靠性。结果在最佳磨削工艺参数下,砂纸研磨阀座和阀瓣的磨削量为0.023 mm,表面粗糙度为0.135μm,研磨膏抛光阀座和阀瓣的表面粗糙度为0.073μm。结论砂纸研磨最佳工艺参数:研磨压力80 N,研磨转速80 r/min,研磨时间10 min,砂纸细度1000目。研磨膏抛光最佳工艺参数:抛光压力30 N,抛光转速100 r/min,抛光时间10 min。采用砂纸、研磨膏磨削修复工艺,可以提高磨削量,降低表面粗糙度,提高了安全阀磨削后的密封性能。

The work aims to meet sealing requirements of safety valve seat and valve disc fitting surface, improve grind re- pair quality and efficiency of safety valve sealing surface, and make valve seat and disc surface roughness Ra〈0.1 μm. With Al2O3 abrasive paper and white corundum abrasive paste as grinding medium, effects of grain fineness, grinding time, grinding speed and grinding pressure on sealing surface roughness and grinding amount were studied based on orthogonal experiment. Surface roughness, grinding amount and surface morphology of the valve seat and valve disc were measured and analyzed using roughness tester, micrometer and electron microscope. Optimum technological parameters were obtained with grinding amount and surface roughness as evaluation indicators, and reliability of the experiment was verified by mUltipte repetitive experiments. Provided with optimum grinding technological parameters, the grinding amount of vatve seat and valve disc grinded by sandpaper was 0,023 mm, and surface roughness 0.135μm, surface roughness of valve seat and valve disc polished with abrasive paste was 0i073 μm. Optimum technological parameters for sandpaper grinding are： grinding pressure 80 N, grinding speed 80 r/min, grinding time 10 rain, sandpaper fineness 1000 mesh; for abrasive paste polishing： polishing pressure 30 N, polishing speed 100 r/min and polishing time 10 min. Sandpaper and grinding paste grind repair process can improve grinding amount, reduce surface roughness, and improve sealing performance of grinded safeW .calve