Repairing a shaft that cannot be welded with titanium putty!
There was an unusual noise coming from the shaft of the mill (grinder) used in the quarry, so upon disassembly and inspection, wear was observed on the contact surface with the inner ring of the bearing. Issues: 1. Due to the structure incorporating wiring cables inside the shaft, repair methods that involve heat, such as thermal spraying or welding, cannot be used. 2. General-purpose putties like epoxy have durability issues. 3. Finishing lathe processing to the specified shaft dimensions is necessary. 4. The line cannot be stopped for a long time, so repairs must be completed in a short period.
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A repair method using titanium putty, which excels in wear resistance and corrosion resistance, has been proposed. Points: 1. It contains titanium powder, providing outstanding wear resistance. 2. No heat treatment is required, eliminating concerns about thermal distortion and thermal deformation. 3. The curing time is short (working time: 20 minutes at 25°C; coating curing time: 4 hours at 25°C), and it can be machined after curing. Since the temperature during construction was also high this time, a curing time of 2 hours was taken before performing lathe machining. 4. To improve adhesion, threading was performed on the substrate using a lathe this time.
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