In order to develop a durable steel roll of the drum type leaf-stripping machine for sugar cane, the wearing characteristics of the leaf-stripping steel roll were analyzed. The obtained results are as follows.
1) The wear resisting rate at the dry portion of the carburizing and induction hardening STKM-17A steel roll showed higher value as compared with the wet portion. The wear resisting rate was 97.3% at the dry portion, 96.9% at the wet portion under the elapsed time of 800 hours, respectively.
2) In case of the setting a limit of the durability to 98.0%, the durable time was about 550 hours at the dry portion, and about 450 hours at the wet portion.
3) The height of knurling was 0.26mm at the dry portion and 0.18mm at the wet portion under the elapsed time of 450 hours, respectively.
4) The wear resisting rate of the induction hardening SUJ-3 steel roll was 97.5% at the dry portion and 97.2% at the wet portion under the elapsed time of 800 hours, respectively.
5) The durable time was about 630 hours at the dry portion and about 520 hours at the wet portion. The height of knurling was 0.35mm at the dry portion and 0.29mm at the wet portion under the elapsed time of 450 hours.
6) The wear resisting rate of the carburizing and induction hardening SUJ-3 steel roll was 97.9% at the dry portion, 97.5% at the wet portion under the elapsed time of 800 hours. These rates showed higher value as compared with the induction hardening SUJ-3 steel roll, respectively.
7) The durable time was about 750 hours at the dry portion, about 620 hours at the wet portion. The height of knurling was 0.43mm at the dry portion, 0.37mm at the wet portion under the elapsed time of 450 hours, respectively.
8) The durable time of the carburizing and induction hardening SUJ-3 steel roll was about 1.4 times longer (the increase of the cane treatment of about 170 ton) as compared with the carburizing and induction hardening STKM-17A steel roll. But, these values should be analyzed under practical field tests.
9) The main reason for lower wear resisting rate at the wet portion could be considered that there is effect of the corrosion on the steel roll surface. In order that the results, cane juice should be eliminated from the steel roll surface after the practical operation.

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In order to mechanize the topping operations of sugar cane, a topping machine using a rotary saw was developed examining the topping performances of the machine. The stripping performances of a long-stem type stripping machine was also tested for improving the working efficiency.
The results were summarized as follows.
1) Increased topping rate of the cane at a proper node was 94.1% under cane conveyor and cutter speeds of 0.25 and 18.0m/s, respectively.
2) Higher topping rate of the cane at an improper node and non-topping rate were obtained, respectively under the cane conveyor speed of 0.25m/s and above, as it was highly affected by the operator's feeding ability.
3) Higher topping efficiency was 1, 638kg/h under the cane conveyor speed of 0.25m/s and cutter speed of 18.0m/s, which was about 3 times as much as that by hand operation. The practical usage of this machine was well recognized.
4) The automation of the feeding process of the canes and the handling method of the bended canes at a large angle must be investigated in the future.
5) In the case of a combination of topping and stripping machines, the stripping performances were obtained as 80.3, 2.5 and 0.1% for detrash rate, trash rate and cane loss, respectively. The working efficiency was 865kg/h, which was about 7 timeshigher as compared with manual operation.

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