High-quality circular saw blades – more than just a circular set of teeth!
Author: Hermann Engert, Key Account Manager (AKE)
When does a saw blade become a precision tool of the highest quality? The basic body, solder and cutting material have a significant influence on the properties of the circular saw blade and therefore on the quality of the cut and the tool life. This article elaborates on the criteria for high quality circular saw blades.
When does a saw blade become a precision tool of the highest quality? The basic body, solder and cutting material have a significant influence on the properties of the circular saw blade and therefore on the quality of the cut and the tool life, which are the primary criteria on which a circular saw blade is judged when cutting through a single board or a pack of boards.
In order to achieve the best possible results, the individual design of the saw blade should also be matched to the particular task in hand. Today, many areas of application are generally covered by catalog products offered by the many different saw blade manufacturers. However, in order to operate plants with greater focus on the process and with maximized productivity, it is essential that the circular saw blades required to do this are carefully matched to the production conditions.
Thinner, faster, longer, better.
Following the motto "thinner, faster, longer, better", ever increasing demands are placed on high quality circular saw blades. The magic word here is "resource management". As a result of the increasing scarcity of natural resources and the need to use them more carefully (both materials and energy), kerf widths are constantly shrinking whilst the diameters remain the same. Due to their particular properties, circular saw blades have a very distinctive vibration behavior. When we consider the blade as a disk, the unfavorable relationship between its diameter and the thickness of the steel blade is soon apparent. Due to the steadily decreasing kerf widths demanded by the industry, tool manufacturers are faced with increasingly tough challenges which demand new solutions. Under these conditions the process of dressing, which is understood to mean the process of making the circular saw blade flat, and the process of clamping, whereby the middle part of the saw blade is tensioned, are two production steps which are essential requirements for the correct
functioning of a saw blade. Both processes are often applied together, and should also be checked during subsequent servicing of the saw blade and corrected as required. With the aid of the clamping and dressing processes it is possible to ensure that the saw blade behaves in a controlled manner both under no-load operation and while cutting, i.e. the saw blade should not wander in the material being cut, if enough tension is provided. Here, it is absolutely vital to know that a saw blade will behave differently in edge cuts – i.e. in cuts with significantly lower material resistance on one side than on the other – to uniform loads which are equal on both sides. Still today, depending on the type and layout of the saw, a lot of manual work is required in some cases in order to clamp and dress the saw blade. Expertise has now been accumulated for many decades in this area in the form of empirical data which includes the handling of the locationand number of pitch circles which are rolled into the basic body with roller machines.
Two further quality criteria which have a direct influence on the quality of the cut are the quality of balancing and the concentricity.