The surface of the aluminum rod has grooves

The aluminum rod has become oval. Maybe the mold is not placed correctly. The mold needs to be adjusted.

There is triangular metal pressed into the surface of the aluminum rod. It may be that there is metal stuck on the surface of the die hole, or the guide roller of the stretching machine is scratched. The guide roller needs to be replaced or repaired.

There are longitudinal grooves on the surface of the aluminum rod. It may be that there is water, kerosene, or sand in the lubricating oil. The lubricating oil needs to be replaced.

There are metal chips in the mold working area, and the mold needs to be replaced.

There are traces of lubricating oil on the surface of the aluminum rod after annealing.

The mechanical properties of the aluminum bar are not up to standard, which may be due to the chemical composition of the aluminum bar or the defects of the raw materials. To improve the quality of the raw materials,

The final cooling amount is not enough, and the process regulations must be strictly followed.

The temperature difference of the heating furnace is too large and the temperature is abnormal. The heating furnace needs to be checked.