Sawblade for a circular saw, method for producing a sawblade, and circular sawing machine

Abstract

A sawblade for a circular saw, including a round, disk-shaped core blade made from one or more parts, with a plurality of circumferentially distributed saw teeth being arranged at its external perimeter and with its center comprising a connection for fastening the sawblade at a driveshaft, and at least one side area of the core blade including open channels 7 for guiding liquids. A circular sawing machine having such a sawblade and a method for producing such a sawblade are also provided.

Claims

1. A sawblade for a circular saw, comprising a disk-shaped core blade (2) made from one or more parts, with a plurality of circumferentially distributed saw teeth (3) arranged at an external perimeter thereof, a center comprising a connection (5, 6) for fastening the sawblade (1) at a driveshaft (4), and at least one side area of the core blade (2) is provided with open channels (7) for guiding liquids, and a surface of the side area of the core blade (2) provided with the channels (7) is equipped with a liquid-repellent coating, the channels (7) being located on an outwardly facing, visible surface of the sawblade configured to engage a workpiece, the liquid-repellent coating is provided on the surface of the at least one side area outside of the channels (7), and the channels (7) are not provided with the liquid-repellent coating, wherein the connection for fastening the sawblade (1) to a driveshaft (4) comprises at least one flange (5) attached to the core blade (2), and at least a portion of the channels (7) extend completely to a periphery of the flange (5).

2. The sawblade according to claim 1, wherein the channels (7) are inserted by way of engraving in the side area of the core blade (2).

3. The sawblade according to claim 1, wherein the channels (7) extend from at least one of a central area or an area of the core blade (2) brushed by a guiding device (9) essentially to the external perimeter of the core blade (2).

4. The sawblade according to claim 3, wherein the channels (7) end at the external perimeter of the core blade (2) respectively between the saw teeth (3).

5. The sawblade according to claim 1, wherein the channels (7) have an arc-shaped progression in order to accelerate a liquid guided therein, due to rotation of the sawblade (1) and a thus generated centrifugal force, towards the external perimeter of the core blade (2).

6. The sawblade according to claim 1, wherein the flange (5) forms a liquid reservoir between itself and the side area of the core blade (2), and at least the portion of the channels (7) that extends underneath the flange reaches into the liquid reservoir.

7. The sawblade according to claim 6, wherein the flange (5) is provided with a liquid supply that is connected to the liquid reservoir.

8. The sawblade according to claim 1, wherein the sawblade (1) is provided with a guiding device (9), which comprises at least one fastener (10) and gliding parts for an at least temporarily gliding contact to the core blade (2), and at least a portion of the channels (7) partially extends in an area brushed by the guiding device (9), and the fastener (10) of the guiding device (9) includes a liquid connection (12).

9. A method for producing a sawblade (1) according to claim 1, comprising engraving the open channels (7) for guiding liquids.

10. The circular sawing machine according to claim 1, wherein the flange (5) forms a liquid reservoir between itself and the side area of the core blade (2), and at least the portion of the channels (7) that extends sectionally underneath the flange reaches into the liquid reservoir, and the driveshaft (4) includes a liquid passage which extends from a connection to a liquid reservoir formed between the flange (5) and the side area of the core blade (2).

11. The circular sawing machine according to claim 1, further comprising a guiding device (9) for the sawblade (1), which comprises at least one fastener (10) and gliding parts for at least a temporarily gliding contact with the core blade (2), the guiding device (9) being provided with a liquid connection (12), and with at least a portion of the channels (7) extending on at least one side area of the core blade (2) of the sawblade (1) in an area brushed by the guiding device (9).

12. The sawblade according to claim 1, wherein the channels (7) have an arc-shaped progression.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, several exemplary embodiments of a sawblade designed according to the invention are described in greater detail and explained based on the attached drawings. Shown here are:

(2) FIG. 1 a perspective illustration of a sawblade embodied according to the invention with an enlarge detail;

(3) FIG. 2 a top view of another embodiment of a sawblade according to the invention;

(4) FIG. 3 a top view of a sawblade of FIG. 1;

(5) FIG. 4 a top view of another embodiment of a sawblade according to the invention;

(6) FIG. 5 a top view of another embodiment of a sawblade according to the invention;

(7) FIG. 6 a top view of another embodiment of a sawblade according to the invention;

(8) FIG. 7 a perspective view of a sawblade with a guiding device;

(9) FIG. 8 a top view of another embodiment of a sawblade according to the invention;

(10) FIG. 9 a top view of another embodiment of a sawblade according to the invention; and

(11) FIG. 10 a perspective view of the sawblade of FIG. 9, comprising a guiding device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(12) FIGS. 1 to 10 show different exemplary embodiments of a sawblade designed according to the invention, with identical or equivalent elements respectively being provided with the same reference characters. Accordingly, not all details are repeatedly described in all exemplary embodiments.

(13) FIG. 1 shows in a perspective view, with an enlarged detail, a sawblade 1, comprising a core blade 2 embodied here in one piece, which ends at its exterior perimeter in a plurality of saw teeth 3 distributed over the circumference. An opening (not visible here) is located in the center of the core blade 2, penetrated by a driveshaft 4. The torque-proof connection between the driveshaft 4 and the core blade 2 is implemented by a flange 5, which is fastened with a plurality of screws 6 to the core blade 2.

(14) A liquid reservoir is located between the flange 5 and the core blade 2 for a cooling-lubricating emulsion, which is supplied via a liquid passage (not shown) in the driveshaft 4.

(15) The side area of the core blade 2 visible here is provided with a plurality of engraved channels 7, as disclosed by the enlarged detail in FIG. 1, which extend on the one side until underneath the flange 5 and there extend to the liquid reservoir and on the other side end in the chip spaces 8 between the saw teeth 3 at the external perimeter of the core blade 2.

(16) Based on the rotary motion of the sawblade 1, a centrifugal force acts upon the liquid in the liquid reservoir underneath the flange 5 such that the liquid, as shown in the enlarged detail of FIG. 1, is accelerated in the channels 7 towards the external perimeter of the sawblade 1. Based on adhesion forces and the arc-shaped progression of the channels 7, the liquid remains essentially in the channels 7 and is this way reliably guided to the chip spaces 8 between the saw teeth 3. In particular when the saw teeth 3 travel through a cutting channel in the material to be sawed, the channels 7 are covered in the cutting channel, which can be additionally considered for the arc-shaped progression of the channels 7. The side area of the core blade 2 can additionally be provided with a liquid-repellent coating outside the channels 7 so that the liquid is guided even better inside the channels 7.

(17) FIG. 3 shows a top view of the sawblade 1 of FIG. 1, while FIG. 2 also discloses such a top view of a similarly embodied sawblade 1, with here however the channels 7 comprising a mirrored arc-shaped progression. Due to the fact that the sawblade 1 in the illustration of FIGS. 2 and 3 moves in a counter-clockwise direction, in the exemplary embodiment according to FIG. 2 in the arc-shaped progression of the channels 7 the liquid guided in these channels 7 is initially accelerated primarily in the direction of rotation near the central regions of the core blade 2, while the radial acceleration increases the more the liquid in the channels 7 approaches the external perimeter of the sawblade 1.

(18) In the chip spaces 8 the liquid then exits the channels 7 with high speeds such that it is capable to rinse chips out of the chip spaces 8.

(19) FIGS. 4 and 5 also show top views of two exemplary embodiments for a sawblade 1 embodied according to the invention in which the progressions of the channels 7 are mirrored. Except for the channels 7 these sawblades 1 are embodied identically to the previous exemplary embodiments.

(20) FIG. 6 shows a top view of a sawblade 1, with its channels 7 extending radially in a straight line. Here too the remaining features are once more identical to the features of the previous exemplary embodiments.

(21) FIG. 7 is a perspective view of a sawblade 1, which in turn comprises a core blade 2 with saw teeth 3 formed thereon in one piece, rests on a driveshaft 4, and is fastened thereat via a flange 5. Additionally, it shows a guiding device 9, which comprises particularly two fasteners 10 in which (not visible here) gliding parts made from hard metal are resting, by which the core blade 2 is guided. The guiding device 9 comprises a handle 11 by which it can be unfolded in order to allow exchanging the sawblade 1 as well as perhaps also the gliding parts in the fasteners 10.

(22) The particular feature of this exemplary embodiment comprises that the channels 7 in the side area of the core blade 2 do not extend to the flange 5 but only from an area, which is brushed by the gliding parts of the guiding device 9, to respectively the chip spaces 8 between the saw teeth 3. Since the liquid that shall be guided through the channels 7 is generally a cooling-lubricating emulsion, here it is introduced via a liquid connector 12 of the guiding device 9 into it and forwarded by the channels 7.

(23) This exemplary embodiment is advantageous in that the channels 7 need to be embodied only with a relatively short design (however it is not excluded in this exemplary embodiment to allow the channels reaching up to an area underneath the flange 5) and the path of the liquid inside the channels 7 is relatively short. The supply of the liquid via the liquid connection 12 of the guiding device 9 is uncomplicated. On the other side the fasteners 10 of the guiding device 9 are arranged as closely as possible near the external perimeter of the core blade 2, due to the principle applied here, so that the cutting area of the sawblade 1 is located at an angular range which is between the two fasteners 10 and their gliding parts. This results in the need for the channels 7 to be formed such that the liquid essentially exits only between the saw teeth 3 when they enter into the material to be sawed.

(24) FIGS. 8 and 9 show a top view of two exemplary embodiments of a sawblade 1 according to the invention, with their channels once more being mirrored and not extending to the central areas of the core blade 2. The channels 7 of these exemplary embodiments are rather provided to cooperate with a guiding device 9, as shown in FIG. 10. The arc-shaped progression of the channels 9 is here optimized such that the liquid 7, which is supplied in the guiding device 9 (via the liquid connection 12) initially accelerates in the direction of rotation and then with increasing speed and accordingly rising centrifugal force reaches a more radially extending section of the channels 7, where it then is essentially only accelerated in the radial direction in order to reach the chip spaces 8 of the sawblade 1 at a speed as high as possible.