How to choose Hydraulic Nut for high precision slitting line? What is the difference between Floating Seat and Hydraulic Nut?
Views : 3205
Author : Mr. Jiang
Update time : 2020-03-12 20:17:00
For modern slitting line, the precision of slitting tools is very important. Although all tools are made in high-precision level, the accumulative error cannot be absolutely avoided, especially for the slitting line with long arbor. In this situation, if we still use mechanical nut, the pressure is not enough. In this article, we mainly talk about the difference between Floating Seat and Hydraulic Nut. For more information of Hydraulic nut, you can refer to another article.
Floating Seat
The ID of Floating Seat is same with the ID of Slitter Blade, BSR (Bonded Stripper Rings) and Spacers. If there is a key on the arbor, Floating Seat must have keyway as well. Refer to figure 1, the Floating Seat is usually installed on the back section of the arbor, then one or two pieces of thick spacers. After the thick spacer, mechanical nut must be installed. Most of Floating Seats have 1-2mm clamping range. With special design, it also can get around 4mm clamping range. From working mechanism of Floating Seat, it inevitably brings the following problems.
1. As part of spacers, Floating Seat is not as precise as the other slitting tools. Thus it inevitably brings some negative effects to accumulative errors.
2. In the end of arbors, there is mechanical nut which is installed by hammer. Such operation, it is not good for precise parts, such as bearing.
3. With slitting machine running, the mechanical nut will slowly start to loosen. The strength of whole slitting head will be not enough. And the clearance cannot be guaranteed because the thin spacers with poor flatness cannot be flattened.
Hydraulic Nut
Hydraulic Nut is installed in the end of arbor, same as figure 2. It means that the whole arbor is just covered by high-precision slitting tools. The accumulative errors will be in the lowest level. Not like Floating Seat, Hydraulic Nut is with screw ID and the direction of this screw is opposite to the direction of rotation of arbor. With slitting line running, Hydraulic Nut will be tighter. At the same time, the screw ID of Hydraulic Nut will also create pressure when we pressurize the nut, which also can make sure that the hydraulic nut will not loosen.
Generally Speaking, no matter the convenience of operation or use effect, the Hydraulic Nut is much better than Floating Seat.
Floating Seat
The ID of Floating Seat is same with the ID of Slitter Blade, BSR (Bonded Stripper Rings) and Spacers. If there is a key on the arbor, Floating Seat must have keyway as well. Refer to figure 1, the Floating Seat is usually installed on the back section of the arbor, then one or two pieces of thick spacers. After the thick spacer, mechanical nut must be installed. Most of Floating Seats have 1-2mm clamping range. With special design, it also can get around 4mm clamping range. From working mechanism of Floating Seat, it inevitably brings the following problems.
1. As part of spacers, Floating Seat is not as precise as the other slitting tools. Thus it inevitably brings some negative effects to accumulative errors.
2. In the end of arbors, there is mechanical nut which is installed by hammer. Such operation, it is not good for precise parts, such as bearing.
3. With slitting machine running, the mechanical nut will slowly start to loosen. The strength of whole slitting head will be not enough. And the clearance cannot be guaranteed because the thin spacers with poor flatness cannot be flattened.
Hydraulic Nut
Hydraulic Nut is installed in the end of arbor, same as figure 2. It means that the whole arbor is just covered by high-precision slitting tools. The accumulative errors will be in the lowest level. Not like Floating Seat, Hydraulic Nut is with screw ID and the direction of this screw is opposite to the direction of rotation of arbor. With slitting line running, Hydraulic Nut will be tighter. At the same time, the screw ID of Hydraulic Nut will also create pressure when we pressurize the nut, which also can make sure that the hydraulic nut will not loosen.
Generally Speaking, no matter the convenience of operation or use effect, the Hydraulic Nut is much better than Floating Seat.
Fig. 1 Floating Seat
Fig. 2 Hydraulic Nut
