BNT 100

Fully automatic 3-axis-control profile deep grinding machine with continuous dressing (CD grinding)

The automation sector has a long tradition at ISELI. What began with partial and full automation of side and profile sharpening machines for band and circular saw blades was further developed for automation in our robot system for the automatic handling of circular saw blades and the fully automatic production center for the package grinding of industrial saw blades. The focus is on intuitive operation, fast changeover times and absolute precision in series. In times of staff shortages, end-to-end automation is a productive alternative to partially automated machines.

Highlights of the ISELI deep grinding center

  • The machine downtime is extremely short. On the one hand, the setup and changeover times are reduced to a minimum thanks to optimal accessibility and ease of use; on the other hand, the machine is designed to be low-maintenance.
  • The metal removal rate is trimmed to an optimum. The powerful grinding wheel drive and the ingenious cooling lubricant supply set new standards in the area of grinding performance.
  • The grinding process. Thanks to CD grinding (Continuous Dressing), the grinding wheel is always precise and sharp: the basis for optimal conditions in order ensure a constant quality of the grinding process hours after hours.
  • No post-processing is necessary. Each steel band comes out of the machine fully processed. Thanks to the integrated burr plate, no post-processing is necessary in the area of burr formation. In addition, a blow-off device ensures that the steel strips are rolled up without any coolant residue.
  • Freedom thanks to modern control technology. In the area of process technology, individual customer requests can be addressed. Processes and speeds can accordingly be adapted for each customer and product.

Technical data

Tooth geometry:Optional, special dressing disc
Tooth pitch:1.0 – 12.0 mm
Tooth height1 – 3.8 mm
Rake angleup to 15°
Blade width5 – 30 mm
Stack size:up to 12 mm
Number of bandsawsup to 20
Hydraulic clamping of saw blade stack120 bar (16.5kN)
Grinding wheel Ø:380 - 500 mm
Grinding wheel bore Ø:203 mm
Drive power grinding motor22 kW
Grinding spindle Ø160 mm
Belt drive gear ratio1:2
Electrical connection:400V 3Ph 50Hz
Compressed air connection:6 bar

System technology periphery
In order to reliably carry out the deep grinding process, the peripheral devices must harmonize as a system. In addition to the coil handling system, this includes cooling lubricant processing, mist extraction and the hydraulic system for clamping the steel strip bundles. The control system of the ISELI machine controls the process. With the appropriate monitoring systems, it ensures continuous process reliability.

Expertise of the BNT 100

With this extremely robust and state-of-the-art machine, tooth profiles are ground in steel strip packages using the deep grinding process.
Thanks to the CNC axes, there are no limits to the deep grinding process. Feed and cutting speeds, acceleration profiles and much more can be entered on the user-friendly interface of the touch panel. In addition, the machine offers a lot of freedom with regard to the tooth geometries to be ground. The optimal geometry and equipment of the machine are determined according to the customer's product portfolio. This is and example of how close we work with our customers from the metal, wood, plastics and food industries in order to optimally cover their needs.
The handling for the grinding process of the steel strip bundles is completely automated. The individual steel strips rolled up into coils are brought together outside the machine as a steel strip bundle. The thickness of the individual steel strips can be freely selected. When stacked, it is possible to grind a thickness of 12 mm. Once the deep grinding process has been carried out in the machine, the steel strip bundle is opened and rolled up onto individual coils.

The deep grinding process (CD grinding)

In a first infeed, every second tooth of the group is ground using the deep grinding method. The grinding wheel geometry is transferred one-to-one to the workpiece. This is followed by an advance of one tooth pitch. With a further infeed, at this point in the group, the remaining teeth are ground. This is followed by a free grinding in both positions, in which the grinding burr is removed. After these infeed operations, the steel strip bundle is advanced by a whole group and the process runs through this repetitive procedure endlessly. The process is stopped by a sensor when the steel strip runs out or by pushing a button.
During the deep grinding process, the dressing diamond continuously ensures that the grinding wheel maintains its exact shape. Accordingly, in theory, endless grinding can be carried out until the minimum grinding wheel diameter is reached. In this process, the operator only takes on the role of controller and checks from time to time the dimensional accuracy of the sawtooth profile and the surface quality of the grinding surface.