Diamond/ CBN Grinding Wheels designed for Pulp & Paper Industry
:yinglong :2017-08-23 09:37:00
Grinding of paper mill calendar rolls is one of the most difficult grinding operations in industry. They are very long relative to diameter, hard, and have close tolerances. They require a good to excellent surface finish. Grinding of other types such as stainless sucker rolls also is no easy task.
Historically, paper mill rolls have been time consuming to rough and more so to finish. Considerable operator skill has been required as well as attention to the machine and surroundings.
Difficulties encountered may include roll deflection and sag, bearing induced effects, vibration, roll to wheel harmonics, wheel glazing, stainless steel loading and the like. Grinding, especially finish grinding, can be a sensitive process. One roll might grind with few problems. The next could take twice as long.
YINGLONG SUPERHARD MATERIAS MANUFACTORY has specialized in producing Grinding Wheel for 41 years. And We have been doing foreign business export for over 18 years. For the Pulp & paper industry, we have some specially designed grinding wheel for our customer. As below:
And here are some pictures for you reference:
The choice of grinding wheel for roughing and/or finishing has always been of prime importance. A wheel that is too hard, soft, has hard spots or varies wheel to wheel can cause much time loss. The loss may be due to the operator having to compensate by:
• slowing travel across the roll
• reducing depth of cut (more passes)
• regrinding to remove chatter, etc.
• dressing wheel frequently
Subtle inefficiencies can occur in roll grinding. Time-held practice may seem satisfactory. For example, the wheel traditionally used may seem to be as aggressive
as can be expected. Its abrasive action, however, could be considerably less than with another type wheel. Technology has advanced.
Additionally, roughing and finishing with one wheel may take more time than with the best wheel for each. Particularly with chilled iron rolls, a wheel hard enough for roughing can be too hard for ease of finishing. The problem appears as chatter, spiral bands, heat buildup, grain pits and other such defects. Trying to finish these out requires more passes and at a slow pace.
