Analysis of the causes of the scars on the conveyor chain
1. Removal of cutting burrs on the casting slab of the conveyor chain
It is generally believed that the failure to remove the casting burr in a timely manner is the main cause of the scarring of the conveyor chain. The casting machines are equipped with spindle-type deburring machine steel plates after the second cutting of the billet, relying on the photoelectric cell to detect the position of the billet, automatically controlling the lifting of the burr machine, and removing the burrs at the head and tail of the lower table by the rotation of the hammer knife. The burrs are not cleaned and will cause damage to the steel plate during the subsequent rolling process, causing scars.
2. Accumulation on the surface of the casting billet
During the cutting process, there is a slag buildup phenomenon on the steel sheet and the head and tail of the cast billet. Seriously, a dense strip of slag steel will be firmly attached to the upper cut of the billet. The slag steel is formed because the flowing metal at the cutting slot cannot be blown away in time during the cutting process of the casting billet, but overflows upward along the cutting slot and accumulates on the upper end of the casting billet.
The reasons for the increase in the surface slag accumulation on the casting slab are: low oxygen purity, inappropriate use pressure or large fluctuations; later life of the cutting nozzle, diameter expansion; different steel types or cross-section steel plates, the cutting speed setting of the cutting car is not suitable, and deteriorates Cutting effect.
3. The phenomenon of tilting head and tail of the conveyor chain
When the steel plate is rolling in the finishing mill, the head and tail of the steel plate will hit the side guide plate. The sparks will be scattered and some splashes will be scattered on the steel plate. It is mainly caused by the meandering bending of the finished rolling plate, the deviation of the steel plate from the center line of the finishing roll, the poor rolling unit rolling, rolling, and off-roll control. The frame is pressed into the surface of the steel plate to form scars.