Log saw blade, high performance log saw blade
IBISE log saw blade that can be specifically designed to provide long service life for an extra clean cut of tissue paper, toilet roll, exceptional durability and outstanding cut quality of your end product. All log saw blades are manufactured from 1.2379 (D2) high-carbon, high chrome tool steel, with precise heat treatment to achieve a final hardness of Rockwell 60 - 62 and excellent cutting longevity and wear resistance.
IBISE log saw blades ground to excellent sharp and two sided special compound bevel consisting of secondary and primary bevel by advanced CNC operated grinding machines and processes . The bevel geometry is optimized for the application , and polished for minimum friction.
IBISE log saw blades are of Minimum possible static and dynamic run-out. This is largely a function of the steel metallurgy and heat-treatment of the log saw blades. The technique of manufacturing and tensioning and additional measures taken to ensure that blades do not stress relive and loose their tension during transit ,storage and operation. All the log saw blades are eliminated unwanted and uncontrollable residual stress.
IBISE log saw blades are manufactured for PCMC, Perini and other log saw machines with 1-4 lanes
Diameter 610 x Bore 68.26 x Thickness 4.76
Diameter 610 x Bore 68.26 x Thickness 3.80
Diameter 610 x Bore 82.55 x Thickness 4.76
Diameter 610 x Bore 82.55 x Thickness 3.80
Diameter 610 x Bore 100.0 x Thickness 4.76
Diameter 610 x Bore 100.0 x Thickness 3.80
IBISE also provide the perfect CBN grinding wheel for keeping your log saw blades with excellent sharp.
Tissue log saw blade performance requirements
Log saw blade - Minimum possible static run-out
This is largely a function of the steel metallurgy and heat-treatment of the log saw blade, the manufacturing and tensioning technique and additional measures taken to ensure that during transit and storage blades do not stress relive and loose their tension. Higher axial run-out increases the bias cut which can be a source of quality rejects, especially for larger diameter rolls.
Log saw blade - Edge retention
To ensure a clean cut every time it is essential that the log saw blade has a super sharp cutting edge, this is the reason that the log saw machining center is equipped with a set of grinding wheels, after every few cuts the cutting edge bevel is ground to a razor sharp finish. Edge retention is a complex function of the bevel geometry; steel metallurgy, microstructure and hardness; residual stress during manufacture; grinding of the blade during operation etc.
Log saw blade - Dynamic run-out
During operations, the log saw blade experiences significant forces, (1) centrifugal force from the rotation of the blade and the swinging action of the arm and (2) friction forces encountered when the blade is in the cut , the harder, tighter, denser the roll, the higher these forces. It should also be noted that these friction forces are a function of the cross section area of the tissue log being cut; a 15 cm (6 in.) roll will have 2.5 times higher friction forces than a 10cm (4 in.) roll. Both these forces distort the blade and increase blade run-out, resulting in increased bias cut and reduced cutting accuracy.
The friction forces encountered during the time when the log saw blade is “in the cut” generate heat, leading to a steady increase in the temperature of the blade. If the blade’s axial run-out crosses a critical threshold, the cutting process has to be halted to allow the blade to cool down. This can significantly impact productivity.
So reducing friction forces during the cut can have a significant impact not only on the operating temperature of the log saw blade but can also lower the horse power requirement for rotating a blade at 300-400 rpm, especially log saw blades diameters of 800mm+.
Dissipation of the heat generated by friction forces can also be an effective way to keep the blade temperature low. This can be achieved by either a complex blade cooling mechanism installed in the log saw machining center or better still, by using a blade with inherent thermal management capabilities.
Log saw blade - Lubrication issues
Some sort of lubrication is commonly used on the body of the log saw blade to reduce friction forces. However, this lubricant can frequently gum up the grinding wheels reducing their efficacy and eventually leading to dulling of the cutting edge. Also, lubricant contamination can transfer to the tissue rolls, increasing the % of ‘broke’ rolls. Saw blades with a ‘lubricious’, low coefficient of friction surface can significantly reduce lubrication consumption and all of the associated drawbacks of using lubricants.
Log saw blade - Surface engineering
It is clear from the above discussion that log saw blade performance is greatly influenced by its (a) bulk properties (such as metallurgy and microstructure); (b) design and manufacturing processes and tolerances; and (2) the surface properties of the blade. The first two factors have been addressed by tool manufacturers over the years, but surface engineering aspects have been largely ignored.
For traditional industrial tooling it has been well recognized over the past 30 years now that surface coatings can enhance tooling performance significantly, notably, tool life by protecting the cutting edge. In the metal cutting industry the prevalence of Physical Vapor Deposition (PVD) and Chemical Vapor Deposition (CVD) coatings is widespread and 70-80% of all new tooling is coated. These surface engineering advances have not been carried through to Wood, Paper & Tissue cutting. There is very limited use of some coatings, most of them now traditional and with very marginal performance improvement, this includes Teflon, Chrome and Nickel plating, PVD Titanium and Titanium-Aluminum nitride. Coatings such as Teflon are used primarily to improve surface lubricity and reduce friction, whereas Cr and Ni to improve the wear resistance of the cutting edge and the body of the tool. The latter two coatings have higher hardness than the steel used to manufacture the tool, but offer no significant friction reduction or thermal management.The recently emerging EXO technology offers a coating that possess a combination of hardness, lubricity and thermal management that make it ideally suited for creating a premium log saw blade.