DE3718043C2 - Circular saw blade with internal tension distributed over the entire radial width and plastic deformation introduced symmetrically over the thickness to generate the internal tension - Google Patents

Description

The invention relates to circular saw blades according to the preamble from claim 1.

Circular saw blades are known in which the Internal tension through hammer blows in the mold is introduced that these hammer blows oval plastic deformations on the surface as Have markings, the longitudinal axis of the Ovals in the outer ring area of the saw blade tangential and radial in the inner area is arranged.

These saw blades had the disadvantage that the plastic deformation using a hammer and anvil impaired flatness.

Saw blades have also become known plastically in the outer area by means of rollers were deformed, the steel being shaped by the shape of the Rolling body was displaced essentially radially and thus led to an internal tension that the Rolling marks radially outward decreasing tensile stress shown and decreasing radially towards the center hole a compressive stress resulted.

This procedure allowed the necessary Compressive stress in the inner area of the saw blade not to compensate the centrifugal stresses be generated.

The invention is based on the object To create saw blade that once the required Has internal stress state to the thermal and to compensate centrifugal stresses during operation and on the other hand no impairment of the Has flatness of the saw blade.

The features of claim 1 serve to solve this problem.

The saw blade according to the invention is in the outer area in a manner known per se through radial Material displacement into a tensile state offset, the plastic deformation after Location, intensity and shape are completely the same on both sides. The inner area of the circular saw blade according to the invention is due to plastic deformation into a compressive stress state offset, namely by a primarily tangential plastic deformation of the material, the plastic deformation in turn the same on both sides Intensity, location and shape of the deformation points having.

The saw blade according to the invention also shows in The greater degree of plastic deformation near the bore on than in the outside areas because of the centrifugal stresses increase from the periphery to the hole.

The generation of the compressive stress in the interior can through partial plastic deformations that occur simultaneously from both sides with the same force and the same Deformation are carried out, are generated the approximately oval deformation points with their Longitudinal axis are arranged approximately radially.  

In another embodiment, the pressure is inside stress zone generated by rolling, the plastic Deformation on both sides only one less depth and a much larger radial Has width than the plastic deformation by Rollers in the outer area, through which the radial material displacement to generate tension outside area is effected.

Fig. 1 shows the circular saw blade ( 1 ) according to the invention, in which in the upper half the narrow rolling track ( 2 ) is provided in the outer area for generating the tensile stress and the wider rolling track ( 3 ) for generating the compressive stress in the inner saw blade area.

Analogously in the lower half are the deformation points ( 4 ) with tangential orientation for generating the tensile stress in the outer area and the deformation points ( 5 ) with radial orientation for generating the compressive stress in the inner area.

Fig. 2 shows a section according to line I-II, wherein 2.1 the plastic deformation for the tensile stress and the much broader plastic deformation representing 3.1 for the compressive stress area.

4.1 shows the plastic deformation in the deformation points ( 4 ) and 5.1 the plastic deformation in the deformation points ( 5 ) in cross section.

Reference list

1

Saw blade

2 (2.1)

plastic radial deformation in the outer area to generate internal tension in this area

3 (3.1)

plastic tangential deformation in the inner area to generate internal pressure stresses in this area

4 (4.1)

plastic radial deformation in the outer area to generate internal tension in this area

5 (5.1)

plastic tangential deformation in the inner area to generate internal pressure stresses in this area

Claims (3)

1. Circular saw blade ( 1 ) with internal tension introduced by plastic deformation, characterized in that the plastic deformations in a section I-II passing through the center have a smaller ratio of the radial deformation width to the depth of deformation than the plastic deformations in the inner area and that the plastic deformations ( 2 , 3 , 4 and 5 ) on both sides of the saw blade have the same, exactly opposite position, shape and intensity. 2. Circular saw blade according to claim 1, characterized in that the plastic deformations ( 3 and 5 ) by rolling to generate the internal pressure until close to the center hole. 3. Circular saw blade according to one or more of the Claims 1 to 2 characterized in that the Rolling to generate the internal pressure in the inner area is generated by rolling elements, the The crowning radius is larger than the crowning radius of the rollers for generating the internal tension in the outer area.