DE2540583A1 - Circular saw blade for higher cutting speeds - has rolled grooves on both sides and dished centre - Google Patents

Abstract

A circular saw blade (1) hs a rolled groove (2) both sides. The distance of the rolled groove, with reference to the radius of the saw blade and measured from its periphery, measures 1/10r up to 8/10r, preferably between 3/10r and 6/10r. The rolled groove is produced under high pressure so that the ratio of the depression with reference to the radius of the saw blade is 1/10 or up to 1/180, preferably 1/40 to 1/100. Relationship between saw blade thickness and radius is smaller than 0.022, preferably smaller than 0.012.

Description

Saw blade The invention relates to a saw blade with at least one essentially concentrically arranged rolling track.

The circular saw blade described here is intended for solid wood, for example Find use, for example, to make longitudinal cuts. circular saw blades are known in the most varied of embodiments. For example, these be made with set, upset or stellited teeth. Further carbide cutters can be placed on the teeth and up to the cutting circle survive. However, circular saws of this type have disadvantages. Your cutting speed is limited. Circular saw blades are also manufactured by using a concentric arranged rolling track there a hardness zone provides. The course of this Circular saw blades are a little quieter and the cutting surface is cleaner (generally known State of the art).

The object of the invention is to create a circular saw blade that with a much higher cutting speed than conventional saw blades can work, for example with an increased cutting speed of 100 % and more without the sheet running.

The problem posed is achieved in that one is attached on both sides Rolling track - based on the saw blade radius and measured from the periphery - has a distance which is 1/10 r to 8/10 r, preferably between 3/10 r and 6/10 r, and that the rolling track is generated with such a high pressure that the sag in relation to the saw blade radius has a ratio of 1:10 or up to to a magnitude of 1: 180, in particular 1:40 to 1: 100.

This saw blade according to the invention can with almost double and still work higher cutting speed; the cut is straight and the making the saw blade hardly more expensive than conventional saw blades.

Further details of the invention emerge from the drawing and description, namely: FIG. 1 shows a conventional saw blade with a concentric arranged rolling track and FIG. 2 is a schematic diagram of a saw blade according to the invention, which has the slack according to the invention.

A conventional saw blade is - see Fig. 1 - generated so that a rolling track is preferably made in the central area of the radius of the saw blade.

In contrast, the saw blade according to the invention differs according to Fig. 2 in that a rolling track is laid, with a much higher pressure than used with conventional saw blades. This results in one Saw blade 1 with a rolling track 2 a slack 3.

The circular saw blade according to the invention is made with very high biases provided, but - and this could not have been foreseen by the professional world - at compensate for the much higher cutting speeds as if acting it is a flat circular saw resulting from this measure tangential mechanical stresses (= tensile stresses) in the area outside the Rolling tracks are added to the superimposed tangential centrifugal force stresses (= Tensile stress) so great that even at high overtemperature (resulting tangential thermal compressive stresses resulting from the extremely high cutting speeds can still be overcompensated in the edge of the saw blade. This is important because the tangential thermal compressive stresses predominantly according to consistent results are responsible for the instability of circular saws.

The resulting very large mechanical radial compressive stresses inside and outside the concentric rolling track are caused by the radial centrifugal force tensile stresses and radial thermal tensile stresses partially, i.e. at least sufficient but also fully - depending on the excess temperature - compensated, i.e. strongly in any case diminished.

From the drawings Fig. 3 it can be seen that the maximum absolute amount the radial tension of the saw of Fig. 2 is greater than the same amount of the saw of Fig. 1.

This larger amount of radial stress is caused by the

Claims (3)

Amount of radial centrifugal tensile stress and that of radial thermal tensile stress Compensated depending on the excess temperature - in any case greatly reduced - From the drawing Fig. 4 can be seen that the result of the action of rolling with higher pressure resulting tangential mechanical tension of the saw of FIG. 2 at the edge of the saw greater amount / than the tangential mechanical stress of the saw of Fig. 1 am Saw edge. So it happens that in addition to the superimposed centrifugal tensile stress this tangential mechanical tension at the saw edge is so great that even the tangential thermal pressure stresses on the Saw edge can still be overcompensated. Claims 1. Saw blade with at least one essential concentrically arranged rolling track, characterized in that the Rolling track (2) - based on the saw blade radius (r) and measured from the periphery - has a distance that is 1/10 r to 8/10 r, preferably between 3/10 r and 6/10 r, and that the rolling track ~ (2? is generated with such a high pressure that that the sag (d = 3) based on the saw blade radius (r) has a ratio of 1 (d): 10 (r) to 1 (d): 180 (r) - preferably 1 (d): 40 (r) to 1 (d): 100 (r) matters. 2. Saw blade according to claim 1, characterized in that the ratio from saw blade thickness to saw blade radius is smaller than 0.022, preferably smaller is than 0.012. 3. Saw blade according to at least one of the preceding claims,