en.Wedoany.com Reported - A DANOBAT HG grinder manufactured in 2006, after nearly 20 years of service, has been fully restored to its original factory precision through systematic remanufacturing and has achieved fully automated production. This case demonstrates the possibility of bringing aging high-end machine tools back into demanding production lines through deep maintenance.
In the railway equipment manufacturing sector, axle machining quality directly affects train operation safety. This DANOBAT HG grinder was once a core asset of the production line, but nearly 20 years of high-intensity operation had led to challenges: the headstock, tailstock, X/Z axes, and spindle all lost precision, causing significant fluctuations in axle geometric dimensions and an increase in scrap rate; aging mechanical components and electrical elements resulted in frequent breakdowns and prolonged downtime, directly impacting downstream production lines. After comparing multiple options, a major overhaul was deemed the most economical and suitable choice for the customer's long-term development.
The remanufacturing process began with the overhaul of core components. The headstock, tailstock, and grinding wheel spindle were completely disassembled and inspected, with all mechanical elements replaced to ensure precision recovery from the source. At the Shanghai factory, the engineering team simultaneously completed guideway scraping and full ball screw replacement, restoring original geometric alignment accuracy and maintaining stable axle dimension repeatability. Additionally, the machine underwent guard polishing and painting, and all online diameter measuring instruments were replaced, achieving more reliable process control, reducing dimensional variation between batches, and improving product consistency.
During the pre-acceptance phase, all geometric accuracy indicators of the machine met standards, and the dimensional consistency and stability of trial-ground samples at the customer site were significantly better than before the overhaul. In the final acceptance phase, the machine operated with zero failures, production efficiency improved, and downstream production lines were no longer affected by issues from preceding processes. The project team also optimized process parameters for the customer, assisted in trial grinding parts required for new processes, and provided grinding training.
High-end machine tools like the DANOBAT, designed with long service lives and robust structural rigidity, are far from the end of their lifespan after nearly 20 years of service. Through systematic remanufacturing, their original geometric precision can be restored, technical obsolescence addressed, and they can be better adapted to current peripheral equipment standards while enhancing safety and operability. Compared to purchasing new machines, this approach offers lower investment and shorter delivery cycles, effectively extending equipment service life.
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