摘要
CRH5A型动车组制动盘经过多次压装后,盘毂内孔直径尺寸普遍存在超差的情况,导致过盈量很难满足既有检修技术规范的要求,大量盘毂内孔直径尺寸超差的制动盘报废,增加了动车组的检修成本。为了降低动车组的检修成本,通过计算分析及试验验证,确定盘毂孔及车轴盘座的最小过盈量为0.208 mm,压装力计算数值为230~345 kN,满足新造制动盘压装力225~400 kN的要求;通过对8个盘毂孔直径超差且过盈量为0.208 mm的制动盘进行压装试验和反压试验,实际测得的压装力均大于225 kN并与计算值较吻合,且反压过程中制动盘未出现滑动现象,说明制动盘压装合格。试验表明本文推荐的最小过盈量0.208 mm是合理的,可用于修订既有修检修规程。
After CRH5A EMUs brake discs were repeatedly mounted on wheelsets by pressed-on fitting, the inner hole diameter of the hub would usually be out of the limits of tolerance, so it was difficult for the interference to meet the existing maintenance technical specifications. As a result, a lot of discs which the inner hole diameters of the hub were out of the limits of tolerance were scrapped and the EMUs maintenance cost increases. In order to reduce the maintenance cost of EMUs, the minimum interference of the hub and axle was determined to 0.208 mm by calculation and tests, and calculated value of fitting-on force was 230-345 kN, which satisfied the requirement of new brake disc fitting-on force of 225-400 kN; Eight hubs which the inner hole diameters were out of the limits of tolerance and interference of 0.208 mm were mounted on wheelsets by pressed-on fitting and tested by counter-pressure, and the results showed that the actual measured fitting-on force was greater than 225 kN and conformed to calculated values, and the discs didn＇t incure any displacement on the axle in the counter-pressure tests, which indicated that the brake disc pressure was qualified. This showed that the minimum interference 0.208 mm recommended in this article was reasonable and could be used to revise existing maintenance technical specifications.
出处
《机车电传动》
北大核心
2017年第5期18-21,共4页
Electric Drive for Locomotives
基金
原铁道部科技研究开发计划项目(2012J003-B)
