CA1301596C - Circular saw blade - Google Patents
Circular saw bladeInfo
- Publication number
- CA1301596C CA1301596C CA000551865A CA551865A CA1301596C CA 1301596 C CA1301596 C CA 1301596C CA 000551865 A CA000551865 A CA 000551865A CA 551865 A CA551865 A CA 551865A CA 1301596 C CA1301596 C CA 1301596C
- Authority
- CA
- Canada
- Prior art keywords
- saw blade
- bars
- cutter
- circular
- slots
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Sawing (AREA)
- Milling Processes (AREA)
Abstract
Abstract Circular saw blades are provided on their outer periphery with saw tips (1) having hard-metal teeth (2), a centrally located mounting hole (5), and a plurality of cutter slots (12', 12'') that are in each instance arranged in different areas of the diameter of the blade, and cutter bars (8) of hard metal, high performance high-speed steel or tool steel, that are arranged on the trailing edges, relative to the direction of rotation of the blade, of these slots.
In order to create a circular-saw blade in a manner that saves material, that permits the production of very narrow kerfs, and yet is sufficiently stable or stiff, the cutter bars are configured with support bars (8) that extend at both ends beyond the trailing edges of the cutter slots and which are rigidly joined to those points of the saw blade that are covered by the support ends. It is a particular advantage if the inner cutter slots (12', 12'') become wider to the outside, in a radial direction, and in particular are of a wedge shape.
(Figure 8).
In order to create a circular-saw blade in a manner that saves material, that permits the production of very narrow kerfs, and yet is sufficiently stable or stiff, the cutter bars are configured with support bars (8) that extend at both ends beyond the trailing edges of the cutter slots and which are rigidly joined to those points of the saw blade that are covered by the support ends. It is a particular advantage if the inner cutter slots (12', 12'') become wider to the outside, in a radial direction, and in particular are of a wedge shape.
(Figure 8).
Description
~3~S~3~
2 2549~-19 The present invention relates to a circular saw blade with saw teeth, in particular wi~h hard-metal tips, arranyed around its cir~umference, a centrally located moun~ing hole, and a plurality of cutting slots that are arranged in varlous areas of the diameter of the saw blade, and which e~tend essentially radially, these having cut~ing bars of hard metal, hi~h-performance high-speed steel, or tool steel, that are axranged on the trailing edge (relative to the direction of rotation of the saw blade) and extend to the side beyond the saw blade.
Circular saw blades o~ the type described above are known, for example, from DE-OS 22 31 950*. Their outer and their inner cutter slots are in the form of narrow, elongated sllts.
~he cutter bars extend essentially along the rearmost edge of the cut~er slits and in each lnstance extend to a point ~ust beEore their ends. These saw blades work very quietly, even at larger cut heights. However, one feature they have in common with other saws is that in order to be sufficiently stiff, they have to have comparatively thick blades, so that they permit only corre~pondingly wider kerfs and thus cause a correspondingly greater expenditure of material.
For this reason, it is the task oE the present invention to improve and perfect a circular saw blade of the type discussed in the introduction hereto that can be produced economically from the standpoint of materials and which makes it possible to produce very narrow kerfs, and in which the overlapping portion of the hard-metal cutters fitted to the saw teeth can be kept *corresponding Canadian Patent No. 964,557 3~
3 25~}9~-19 small in relation to the ~hickness of the blade.
The present invention provides a circular-saw blade with saw teeth, in particular with hard-metal cutters, arranged around its circumference, a centra:Lly ].ocated mounting hole, and a plurali~y of cutting grooves that are arranged in various areas of the diameter of the saw blade, and which extend essentially radially and have cut-ting bars of hard metal, high-performance hi~h-speed steel, or tool steel arranged on the trailiny edge thereof (relative to the direction of rotation of the saw blade) said cutter hars projecting to the side beyond the saw blade, wherein the ~utter hars of the inner cutter slots are configured as support hars with suppo:rtiny ends that extend raclial:ly at both ends beyond the trailing edges o~ the cutter slots, said supporting bars being rigidly connected in the area of their supporting ends with the points of the saw blade that they cover.
This connection may be effected by welding, in particular tack welding. However, the support bars can be secured to the saw blade b~ adhesion, or by solderin~ or brazing.
It is important for the support bars that their ends extend beyond the trailing edge of the cutter slots, because they contribute greatly to stiffening the saw blade with these supportin0 ends. In the area of the ~utter slot itself the contribution made by the support bars to enhance the stiffness of the blade in comparatively small, since the increase in stiffness that falls to the corresponding middle area of the support bar is : for all practical purposes lost because of the loss of sti-ffness caused by the cutter slot.
~3~ 59~
3a 25~92-19 As has been shown in practise, because of the increased sti.ffness made possible by the presen~ inventionr the thickness of the saw blade can be kept comparatively small, without this giving rise to flutter when the saw is in operation. It is also possible to keep the hard-metal cutter overlap small relative to the thic]cness of the saw blade so that compara~;ively narrow kerfs or cuts can be made with a corresponding saving in valuable saw hlade material.
,.~.
:~S3~5~g6 It is an advantage that the support bars cover each other off continuously in a radial direction. In the simplest case, they can exist as flat bars that are secured so as to lie flat on the trailing edges of the cutter slots and on the points of the saw blades that lie on extensions of these. Furthermore, the support bars can be con~igured as T-profile bars which, in the areas of their supporting ends, extend with their profile cross pieces into insertion slots in the s~w blade on both sides of the trailing edge of the cutter slot since in this case, too, there is a corresponding stiffening of the saw blade.
In addition to this, it is also possible to configure the support bars as L-pro~ile bars, in particular for the case in which they are arranged alternately on one side of the saw blade and on the other. It is, of course, understood that in each instance the support bars can also project from both sides of the saw blade in the area of a cutter slot.
An additional increase in stiffness has been seen in circular saw blades that have a thicker mounting coliar surrounding their central mounting hole if the inner supportiny ends of the innermost support bars extend into recesses cut into the outer periphery of the mounting collar.
Finally, it is a particular advantage if the inner cutter slots grow wider towards the outside, in a radial direction.
This ensures particularly effective removal of the saw dust or chips from the kerf, even in the area of the inner cutter slots.
S~36 Several embodiments of the circular saw blade according to the present invention are shown in the drawings appended hereto. These drawings show the following:
Figure 1: A plan view of the circular saw blade according to the present invention, this having trapezoidal cutter slots;
Figures 2 & 3: An e~bodiment with support bars in the form of flat bars, in plan view and in partial section;
Figures 4 & 5: An embodiment with support bars configured as T-profile bars, in plan view and in cross-section;
Figure 6 A cross-section through an area o~ a circular-saw blade with support bars that project from its cutter slots alternately on one side and on the other;
Figures 7 & 8: Two further circular-saw blades with wedge-shaped inner cutter slots.
The circular saw blade 10 that is shown in figure 1 i5 provided in the usual manner with saw teeth 1 that are arranged around its outer circumference. ~hese saw teeth 1 are fitted with hard-metal tips 2 that extend on both sides. In addition, on the outer circumference there are also notches 3 that are separated by a distance that is greater than the distance between the teeth; the edges 3' of these notches 3, which trail relative to the direction of rotation of the saw blade, are also ., ~
LS~36 fitted with hard-metal cutter plates 4. In addition, the saw blade also has a central mounting hole 5 that is surrounded by a thicker mounting collar ~. The holes 7 that are intended to accomodate the mounting bolts are located in this collar 6.
On both sides of the saw blade there are support bars 8 that extend essentially radially and these are secured, in particular by welding, to the points on the saw blade that they cover. In the central area of the support bars 8, and ahead of them relative to the direction of rotati~n of the saw blade, there are cutter slots 9, so that the support bars 8 extend at both ends radially beyond the trailing edges 9' of the cutter slots. The support bars 8 are connected rigidly to the points on the saw blade that they cover, this being the case espec:Lally in the area of their supporting ends 8' that extend beyond the trailing edges g' of the cutter slots. As the drawing shows, the support bars 8 cover each other off continuously in a radial direction. They can be of saw-blade material, stellite, high-speed steel or of hard metalO These support bars 8 enhance the rigidity of the saw blade to a considerable degree, and it can thus be kept relatively thin. Since the support bars 8 are sharpened on their outer leading edges, they also function as cutter bars that help ensure a cut that is smooth, even in its side areas and, in conjunction with the radially shorter cutter slots, ensure that the saw dust and chips are cleared away from the cut rapidly and effectively.
3~
The inner support ends 8 " of the innermost support bars 8''' extend into recesses 6' in the outer circumerence of the collar 6 and close these off ~lush. This enhanc~s the stiffness of the circular saw blade even further.
As is shown in Figures 2 and 3, the support bars ~ can also be in the form of flat bars siv that are secured so as to lie flat in the area of the trailing edg~s g' of the cutter slots and on those points of the saw blade that lie on extensions of these. This means that each of the flat bars 8iv can project from both sides of the saw blade 10 in the area of a cutter slot 9, as is shown in figure 3. However, it is also possibla the arrange khe support bars 8 alternately on one side o the saw blade and on the other.
Another embodiment of the support bars 8 is shown in figures 4 and 5. Here, they axe of T-profile bars 8V; in the area of their supporting ends svi their profile cross pieces 8vil extend into insertion slots 11 in the saw blade 10, which extend on both sides of the trailing edge of the cutter slot.
In this case, too, the T-profile bars 8v are in each instance secured rigidly to the points 101 of the saw blade that they cover, in particular in the area of their supporting ends 8vi.
In the case of figure 6, the support bars 8~iii are of an L~profile. In this instance, they are installed so as to be arranged alternately on one side of the saw blade and on the other, which also enhances the stiffness o~ the saw blade.
~ .~
Figures 7 and 8 show particularly advantageous embodiments of the new circular saw blade. The inner cutter slots 12 become wider in a radial direction towards the outside, in that they are of a wedge or arc shape. This ensures that the saw dus~
that is produced can be moved out of the saw cut better through the pocket-like wider section of the slots 12 even in the inner area of the saw blade. The pocket-like, widened cutter slots 12 provide for improved egress of the chips and also help to keep the saw blade cool. The support bars 8, which are also used in this embodiment, cover each other off in the various areas, in particular with the outer hard-metal bars 13 in the saw slots 14. Whereas in the case of figure 7, only two inner cutter slots 12 of a wedge-shape are seen, in figure 8 there are two wedge-shaped cutter slots 12' or 12 ", respectively, that are located in two areas of the diameter that cover each other off.
These circular saw blades are used preferably where large cut heights per shaft are to be sawed. In particular, in the case of figure 8, the greater segmentation of the of the cutter slots 12', 12 ", and their hard-metal cutter bars 8 mean that one achieves coverage of the blade with clearing slots right up to the flange of the circular saw blade, with simultaneously greater stability of the saw body, even at extremely large cut heights per shaft.
Circular saw blades o~ the type described above are known, for example, from DE-OS 22 31 950*. Their outer and their inner cutter slots are in the form of narrow, elongated sllts.
~he cutter bars extend essentially along the rearmost edge of the cut~er slits and in each lnstance extend to a point ~ust beEore their ends. These saw blades work very quietly, even at larger cut heights. However, one feature they have in common with other saws is that in order to be sufficiently stiff, they have to have comparatively thick blades, so that they permit only corre~pondingly wider kerfs and thus cause a correspondingly greater expenditure of material.
For this reason, it is the task oE the present invention to improve and perfect a circular saw blade of the type discussed in the introduction hereto that can be produced economically from the standpoint of materials and which makes it possible to produce very narrow kerfs, and in which the overlapping portion of the hard-metal cutters fitted to the saw teeth can be kept *corresponding Canadian Patent No. 964,557 3~
3 25~}9~-19 small in relation to the ~hickness of the blade.
The present invention provides a circular-saw blade with saw teeth, in particular with hard-metal cutters, arranged around its circumference, a centra:Lly ].ocated mounting hole, and a plurali~y of cutting grooves that are arranged in various areas of the diameter of the saw blade, and which extend essentially radially and have cut-ting bars of hard metal, high-performance hi~h-speed steel, or tool steel arranged on the trailiny edge thereof (relative to the direction of rotation of the saw blade) said cutter hars projecting to the side beyond the saw blade, wherein the ~utter hars of the inner cutter slots are configured as support hars with suppo:rtiny ends that extend raclial:ly at both ends beyond the trailing edges o~ the cutter slots, said supporting bars being rigidly connected in the area of their supporting ends with the points of the saw blade that they cover.
This connection may be effected by welding, in particular tack welding. However, the support bars can be secured to the saw blade b~ adhesion, or by solderin~ or brazing.
It is important for the support bars that their ends extend beyond the trailing edge of the cutter slots, because they contribute greatly to stiffening the saw blade with these supportin0 ends. In the area of the ~utter slot itself the contribution made by the support bars to enhance the stiffness of the blade in comparatively small, since the increase in stiffness that falls to the corresponding middle area of the support bar is : for all practical purposes lost because of the loss of sti-ffness caused by the cutter slot.
~3~ 59~
3a 25~92-19 As has been shown in practise, because of the increased sti.ffness made possible by the presen~ inventionr the thickness of the saw blade can be kept comparatively small, without this giving rise to flutter when the saw is in operation. It is also possible to keep the hard-metal cutter overlap small relative to the thic]cness of the saw blade so that compara~;ively narrow kerfs or cuts can be made with a corresponding saving in valuable saw hlade material.
,.~.
:~S3~5~g6 It is an advantage that the support bars cover each other off continuously in a radial direction. In the simplest case, they can exist as flat bars that are secured so as to lie flat on the trailing edges of the cutter slots and on the points of the saw blades that lie on extensions of these. Furthermore, the support bars can be con~igured as T-profile bars which, in the areas of their supporting ends, extend with their profile cross pieces into insertion slots in the s~w blade on both sides of the trailing edge of the cutter slot since in this case, too, there is a corresponding stiffening of the saw blade.
In addition to this, it is also possible to configure the support bars as L-pro~ile bars, in particular for the case in which they are arranged alternately on one side of the saw blade and on the other. It is, of course, understood that in each instance the support bars can also project from both sides of the saw blade in the area of a cutter slot.
An additional increase in stiffness has been seen in circular saw blades that have a thicker mounting coliar surrounding their central mounting hole if the inner supportiny ends of the innermost support bars extend into recesses cut into the outer periphery of the mounting collar.
Finally, it is a particular advantage if the inner cutter slots grow wider towards the outside, in a radial direction.
This ensures particularly effective removal of the saw dust or chips from the kerf, even in the area of the inner cutter slots.
S~36 Several embodiments of the circular saw blade according to the present invention are shown in the drawings appended hereto. These drawings show the following:
Figure 1: A plan view of the circular saw blade according to the present invention, this having trapezoidal cutter slots;
Figures 2 & 3: An e~bodiment with support bars in the form of flat bars, in plan view and in partial section;
Figures 4 & 5: An embodiment with support bars configured as T-profile bars, in plan view and in cross-section;
Figure 6 A cross-section through an area o~ a circular-saw blade with support bars that project from its cutter slots alternately on one side and on the other;
Figures 7 & 8: Two further circular-saw blades with wedge-shaped inner cutter slots.
The circular saw blade 10 that is shown in figure 1 i5 provided in the usual manner with saw teeth 1 that are arranged around its outer circumference. ~hese saw teeth 1 are fitted with hard-metal tips 2 that extend on both sides. In addition, on the outer circumference there are also notches 3 that are separated by a distance that is greater than the distance between the teeth; the edges 3' of these notches 3, which trail relative to the direction of rotation of the saw blade, are also ., ~
LS~36 fitted with hard-metal cutter plates 4. In addition, the saw blade also has a central mounting hole 5 that is surrounded by a thicker mounting collar ~. The holes 7 that are intended to accomodate the mounting bolts are located in this collar 6.
On both sides of the saw blade there are support bars 8 that extend essentially radially and these are secured, in particular by welding, to the points on the saw blade that they cover. In the central area of the support bars 8, and ahead of them relative to the direction of rotati~n of the saw blade, there are cutter slots 9, so that the support bars 8 extend at both ends radially beyond the trailing edges 9' of the cutter slots. The support bars 8 are connected rigidly to the points on the saw blade that they cover, this being the case espec:Lally in the area of their supporting ends 8' that extend beyond the trailing edges g' of the cutter slots. As the drawing shows, the support bars 8 cover each other off continuously in a radial direction. They can be of saw-blade material, stellite, high-speed steel or of hard metalO These support bars 8 enhance the rigidity of the saw blade to a considerable degree, and it can thus be kept relatively thin. Since the support bars 8 are sharpened on their outer leading edges, they also function as cutter bars that help ensure a cut that is smooth, even in its side areas and, in conjunction with the radially shorter cutter slots, ensure that the saw dust and chips are cleared away from the cut rapidly and effectively.
3~
The inner support ends 8 " of the innermost support bars 8''' extend into recesses 6' in the outer circumerence of the collar 6 and close these off ~lush. This enhanc~s the stiffness of the circular saw blade even further.
As is shown in Figures 2 and 3, the support bars ~ can also be in the form of flat bars siv that are secured so as to lie flat in the area of the trailing edg~s g' of the cutter slots and on those points of the saw blade that lie on extensions of these. This means that each of the flat bars 8iv can project from both sides of the saw blade 10 in the area of a cutter slot 9, as is shown in figure 3. However, it is also possibla the arrange khe support bars 8 alternately on one side o the saw blade and on the other.
Another embodiment of the support bars 8 is shown in figures 4 and 5. Here, they axe of T-profile bars 8V; in the area of their supporting ends svi their profile cross pieces 8vil extend into insertion slots 11 in the saw blade 10, which extend on both sides of the trailing edge of the cutter slot.
In this case, too, the T-profile bars 8v are in each instance secured rigidly to the points 101 of the saw blade that they cover, in particular in the area of their supporting ends 8vi.
In the case of figure 6, the support bars 8~iii are of an L~profile. In this instance, they are installed so as to be arranged alternately on one side of the saw blade and on the other, which also enhances the stiffness o~ the saw blade.
~ .~
Figures 7 and 8 show particularly advantageous embodiments of the new circular saw blade. The inner cutter slots 12 become wider in a radial direction towards the outside, in that they are of a wedge or arc shape. This ensures that the saw dus~
that is produced can be moved out of the saw cut better through the pocket-like wider section of the slots 12 even in the inner area of the saw blade. The pocket-like, widened cutter slots 12 provide for improved egress of the chips and also help to keep the saw blade cool. The support bars 8, which are also used in this embodiment, cover each other off in the various areas, in particular with the outer hard-metal bars 13 in the saw slots 14. Whereas in the case of figure 7, only two inner cutter slots 12 of a wedge-shape are seen, in figure 8 there are two wedge-shaped cutter slots 12' or 12 ", respectively, that are located in two areas of the diameter that cover each other off.
These circular saw blades are used preferably where large cut heights per shaft are to be sawed. In particular, in the case of figure 8, the greater segmentation of the of the cutter slots 12', 12 ", and their hard-metal cutter bars 8 mean that one achieves coverage of the blade with clearing slots right up to the flange of the circular saw blade, with simultaneously greater stability of the saw body, even at extremely large cut heights per shaft.
Claims (9)
1. A circular-saw blade with saw teeth, in particular with hard-metal cutters, arranged around its circumference, a centrally located mounting hole, and a plurality of cutting grooves that are arranged in various areas of the diameter of the saw blade, and which extend essentially radially and have cutting bars of hard metal, high-performance high-speed steel, or tool steel arranged on the trailing edge thereof relative to the direction of rotation of the saw blade, said cutter bars projecting to the side beyond the saw blade, wherein the cutter bars of the inner cutter slots are configured as support bars with supporting ends that extend radially at both ends beyond the trailing edges of the cutter slots, said supporting bars being rigidly connected in the area of their supporting ends with the points of the saw blade that they cover.
2. A circular-saw blade as defined in claim 1, wherein the supporting bars cover each other off continuously in the radial direction.
3. A circular-blade as defined in claim 2, wherein the supporting bars are in the form of flat bars that are secured so as to lie flat on the trailing edges of the cutter slots and on the points of the saw blade that lie on extensions of these trailing edges.
4. A circular-saw blade as defined in claim 2, wherein the support bars are configured as T-profile bars which have profile cross pieces that extend into insertion slits provided at both ends of the trailing edge of the cutter slots.
5. A circular-saw blade as defined in claim 2, wherein the support bars are configured as L-profile bars.
6. A circular-saw blade as defined in any one of claims 1 to 5, wherein each of the support bars projects on both sides of the saw blade in the area of a cutter slot.
7. A circular-saw blade as defined in any one of claims 1 to 5, wherein the support bars project alternately on one side and the other of the saw blade.
8. A circular-saw blade as defined in any one of claims 1 to 5, having a thicker mounting collar that surrounds its central mounting hole, wherein the inner supporting ends of the inner most supporting bars extend into recesses arranged around the outer periphery of said mounting collar.
9. A circular-saw blade as defined in any one of claims 1 to 5, wherein the inner cutter slots widen outwardly in the radial direction, and in particular are of wedge shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000551865A CA1301596C (en) | 1987-11-16 | 1987-11-16 | Circular saw blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000551865A CA1301596C (en) | 1987-11-16 | 1987-11-16 | Circular saw blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1301596C true CA1301596C (en) | 1992-05-26 |
Family
ID=4136844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000551865A Expired - Fee Related CA1301596C (en) | 1987-11-16 | 1987-11-16 | Circular saw blade |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1301596C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005108032A1 (en) * | 2004-05-12 | 2005-11-17 | Mcgill Iniversity | Method and mechanism for increasing critical speed in rotating disks and reducing kerf at high speeds in saw blades |
-
1987
- 1987-11-16 CA CA000551865A patent/CA1301596C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005108032A1 (en) * | 2004-05-12 | 2005-11-17 | Mcgill Iniversity | Method and mechanism for increasing critical speed in rotating disks and reducing kerf at high speeds in saw blades |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |