Circular saw blade and hand-held power tool
By setting cemented carbide cutting parts and cogs on the edges of the circular saw blades, and sliding and hard coatings are provided in the core and edges, the problems of short service life and high vibration noise during sawing are solved, and three times the service life is extended and the sawing performance is improved.
Patent Information
- Application Number
- CN202380059782.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-08-15
- Filing Date
- 2023-07-28
- Publication Date
- 2025-03-28
AI Technical Summary
Existing circular saw blades are prone to reduce their service life due to friction and wear during use, and are prone to vibration and noise during sawing.
A plurality of teeth having tooth surfaces are provided in the edge area of the circular saw blade, each of which is equipped with a cemented carbide cutting section, and a tooth groove is formed between two adjacent teeth on the circumferential side. In addition, a sliding coating that reduces friction and a hard coating that reduces wear are provided in the core and edge regions of the circular saw blade, respectively.
The sliding coating reduces the friction between the circular saw blade and the workpiece to be processed, and the hard coating reduces the wear of the circular saw blade, significantly extending the service life of the circular saw blade and increasing its service life to three times. At the same time, vibration and noise during sawing are reduced.
Smart Images
Figure CN119730983A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a circular saw blade having a substantially circular core region, which is surrounded by an edge region adjoining the core region radially outward in the region of a boundary line to form a base body, wherein the edge region has a plurality of teeth with tooth flanks, each tooth flank being respectively assigned a carbide cutting portion, and wherein a tooth groove is respectively formed between two teeth directly adjacent in the circumferential direction. The invention also relates to a handheld power tool having such a circular saw blade. Background Art
[0002] A circular saw blade is known from the prior art, which has a plurality of teeth arranged uniformly spaced apart from one another on the circumferential side. The teeth are integrally formed as a circular steel base body of the circular saw blade and are each equipped with a hard metal sheet oriented in the cutting direction in order to increase the service life of the circular saw blade, wherein the connection between the tooth base and the hard metal sheet is respectively realized by means of a brazed connection. The hard metal sheet can have a coating. The coating can be implemented as a single layer or have a multilayer structure of the same or different types. The coating can consist of a metal, a nitride, a carbide, a carbonitride, an oxide or an oxynitride, each containing one or more elements, such as chromium, titanium and aluminum. Summary of the invention
[0003] The invention relates to a circular saw blade having a substantially circular core region, which is surrounded by an edge region adjoining the core region radially outward in the region of a boundary line to form a base body, wherein the edge region has a plurality of teeth with tooth flanks, each tooth flank being respectively assigned a hard metal cutting part, and wherein tooth grooves are respectively formed between teeth directly adjacent on two circumferential sides. The circular saw blade has a friction-reducing sliding coating and a wear-reducing hard coating which are formed at least partially one above the other.
[0004] The sliding coating allows a significant reduction in the friction between the circular saw blade and the workpiece to be machined, while the hard coating reduces the wear or loss of the circular saw blade. The combination of the two coating types produces a synergistic effect, whereby the service life of the coated circular saw blade according to the invention can be increased by a factor of three compared to a circular saw blade provided only with a sliding coating. The radial width of the annular edge zone lies in the range between 10% and 30%, preferably 20%, relative to the radius of the circular saw blade. The radius of the circular saw blade is defined between its longitudinal center axis in the region of the fastening opening and the tooth tip circle. The cutting process of the workpiece to be machined occurs primarily in the region of the edge zone, while the core zone is defined for guiding the circular saw blade in the cut of the workpiece to be machined and for attachment to the output shaft of the drive motor.
[0005] Generally speaking, it is advantageous to first provide the metal saw blade with a hard coating and subsequently to form the sliding coating.
[0006] Preferably, the core region is provided with a sliding coating and the edge region is provided with a hard coating and a sliding coating.
[0007] Therefore, substantially only the high-load areas of the circular saw blade are provided with the more expensive hard coating. The boundary line produced between the hard coating and the sliding coating can have a geometry that deviates from a circular course and be designed, for example, in a wavy, triangular or trapezoidal meander or the like.
[0008] In a further embodiment, the core region is provided with a sliding coating and the edge region is provided with a hard coating and a sliding coating, wherein the hard metal cutting part is provided at least in regions only with the hard coating.
[0009] Due to the combination of the properties of the sliding in the edge region and the hard coating, the sawing behavior of the saw blade can be further optimized.
[0010] In another embodiment, the core area is provided with only a sliding coating, while the edge area is provided with a hard coating and the sliding coating is radially connected to the hard coating outward, wherein the tooth is provided with only a hard coating, and the hard coating of the tooth extends radially inward to a preferably circular transition line extending in the edge area, wherein the transition line extends radially outside, inside or coincident with the root circle of the tooth.
[0011] The teeth and the radially inward region of the circular saw blade are thereby protected from wear.
[0012] According to the description of a further embodiment, the circular saw blade has in the edge region, starting from at least two tooth roots which are preferably arranged diametrically opposite each other, a substantially V-shaped slot which points radially inwards and is uncoated.
[0013] Due to the slot open on one side, the potential vibration tendency of the circular saw blade and its noise generation can be reduced. The term "uncoated slot" is defined here as the opposite slot walls (whose height corresponds to the material thickness of the base body of the circular saw blade) having no sliding coating or hard coating.
[0014] Preferably, at least two approximately V-shaped circumferential slots are provided in the edge region, which are oriented substantially in the circumferential direction and are free of coating and are preferably situated in the edge region.
[0015] The sawing behavior can be further improved by the circumferential slots introduced into the basic body and closed on both sides. The circumferential slots are preferably spaced uniformly from one another on the circumferential side and are each cut at the same radial distance from the longitudinal center axis.
[0016] In a further embodiment, at least two uncoated gap components are arranged in the core region.
[0017] Furthermore, the noise generation during sawing can be reduced thereby. In addition, the required drive power of the circular saw blade is also reduced, since the circular saw blade can perform at least a slight lateral evasive movement. In addition, the tendency to jam and wear due to wear in the sawing kerf area can be reduced.
[0018] Preferably, at least two slot components each have an approximately V-shaped circumferential slot, the longer section of which extends substantially in the circumferential direction and the shorter side of which extends radially outwardly inclined relative to the circumferential direction, wherein the shorter slot is formed on the longer section.
[0019] This provides the circular saw blade with a movement option transversely to the basic body.
[0020] According to the description of an advantageous embodiment, the core region of the circular saw blade has a fastening opening for the drive shaft, and the fastening opening is arranged concentrically with respect to the longitudinal center axis of the circular saw blade.
[0021] This results in a robust mechanical coupling to the drive shaft of the drive motor.
[0022] Preferably, the core region and the edge region of the basic body are formed integrally from tempered steel, and the cemented carbide cutting part is preferably formed from tungsten carbide-cobalt cemented carbide.
[0023] Thus, widely available standard materials are available for the production of the circular saw blade. The one-piece base body of the circular saw blade is preferably separated from the sheet metal semi-finished product by laser beam cutting. Alternatively, it can also be produced by means of known punching methods.
[0024] Preferably, the hard metal cutting part is fixedly connected to the associated tooth flank, in particular thermally bonded to the tooth flank.
[0025] This results in a reliable and mechanically highly loadable connection between the carbide cutting part that forms the actual cutting edge and the individual teeth of the circular saw blade. The sliding coating is preferably a lubricating coating and has the function of reducing friction between the circular saw blade and the workpiece, as well as gumming and heating. The sliding coating also protects the circular saw blade from oxidation and rust. The sliding function can be achieved by adding lubricant fillers (such as PTFE, graphite, oxides, etc.) to the coating formulation. The sliding coating can be applied by a spraying method or other known techniques. The hard coating preferably has a higher hardness than the substrate of the circular saw blade and is preferably formed in the edge area. The hard coating can be composed of nitrates of chromium aluminum (AlCrN), zirconium (ZrN) or carbon nitrates of titanium (TiN and TiCN), titanium aluminum (TiAlN and TiAlCN), titanium silicon (TiSiN and TiSiCN) and / or other combinations thereof. The function of the hard coating is to reduce the wear of the saw teeth and thereby extend the service life of the circular saw blade. The hard coating can be manufactured by physical or chemical deposition in the vapor phase by known methods. For example, geometric areas with two different coatings can be achieved by means of a template / mask during the coating process.
[0026] The invention further relates to a handheld machine tool, in particular a handheld circular saw or a table circular saw, having a circular saw blade as described above. Furthermore, the circular saw blade as described above can also be used in stationary machine tools.
[0027] This results in a handheld power tool having a significantly extended service life, without having to replace the tool. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In the following description, the invention is explained in more detail based on the exemplary embodiments shown in the accompanying drawings. The accompanying drawings show:
[0029] Figure 1 : A schematic diagram of a first embodiment of a circular saw blade,
[0030] Figure 2 : A schematic diagram of a second embodiment of a circular saw blade,
[0031] Figure 3 : A schematic diagram of a third embodiment of a circular saw blade,
[0032] Figure 4 : Schematic representation of a fourth embodiment of a circular saw blade having a slot in the edge region,
[0033] Figure 5 : A schematic diagram of a fifth embodiment of a circular saw blade having a slot in the edge region, and
[0034] Figure 6 : Graph showing the service life of a circular saw blade according to the invention.
[0035] In the figures, for reasons of economy of representation, structurally substantially identical elements having the same or similar function are always provided with the same reference numerals and are described in detail only once. DETAILED DESCRIPTION
[0036] Figure 1 For the sake of better illustration, only a part of the circular saw blade 100 is shown, which has a substantially circular core 104, which is surrounded by a circular ring-shaped edge region 110 which adjoins the core 104 radially outward in the region of a circumferential boundary line 112 while forming an approximately disk-shaped base body 114 with a radius R. The circular saw blade 100 is preferably designed rotationally symmetrically with respect to the longitudinal center axis 120 and has a central fastening opening 150 for a rotationally fixed connection to an output shaft of a hand-held power tool or a stationary machine tool (not shown in the figure). The core 104 extends radially outward from the fastening opening 150 to the boundary line 112, from which the edge region 110 has a toothing.
[0037] The core region 104 and the edge region 110 together form a one-piece disk-shaped basic body 114 of the circular saw blade 100. The disk-shaped basic body 114 is made of tempered steel and has only a small material thickness in comparison with the order of magnitude of the radius R, so that sufficiently narrow cuts in the workpiece 116 can be achieved with sufficiently high rigidity of the circular saw blade 100. The annular edge region 110 has approximately a radial width B which lies in the range between 10% and 30% of the radius R or the tip circle 162 of the circular saw blade 100, preferably 20%.
[0038] The edge region 110 has n identical (saw) teeth Z pointing radially outward. 1...n , these teeth have tooth surfaces B 1...n Tooth surface B 1...n When the circular saw blade 100 continues to rotate in the cutting direction 124, the teeth Z of the circular saw blade 100 are respectively directed toward the workpiece 116 to be processed or sawn. 1...n In the circumferential direction 122 , the teeth Z are preferably arranged evenly spaced relative to one another, wherein directly adjacent teeth Z on the respective circumferential side are arranged at a substantially uniform distance from one another. 1...n There are tooth roots G 1...n Width of the same tooth groove L 1...n . Tooth root G 1...n In the radially inward direction, each tooth groove L 1...n The lowest area of tooth Z 1...n Each tooth surface B 1...n Preferably, a hard alloy cutting part H is provided. 1...n , used to improve the cutting performance of the saw blade 100. Carbide cutting portion H 1...n It is preferably made of tungsten carbide-cobalt cemented carbide or a material with similar or even higher hardness.1...n and the gears Z respectively assigned thereto 1...n On the corresponding tooth surface B 1...n The teeth are firmly connected in the area of the teeth, preferably thermally joined to these teeth.
[0039] The circular saw blade 100 shown here by way of example and all other embodiments of the circular saw blades according to the invention described below have, with the exception of the optional slot (see Figure 4 and Figure 5 ) preferably have the same geometry and are provided with a sliding coating 130 and / or a hard coating 140 only in different surface areas. According to the invention, the circular saw blade 100 and all further embodiments of the coated circular saw blade explained in the following description each have a friction-reducing sliding coating 130 and a wear-reducing hard coating 140 in the area of the front side 126 and the hidden rear side 128, which are at least partially arranged one above the other or overlap one another. In the first exemplary embodiment of the circular saw blade 100 illustrated here, the core region 104 is provided with a sliding coating 140 and the edge region 110 is provided with a sliding coating 140 in the area of the tooth Z completely enclosing the tooth Z. 1...n In the case of , a hard coating 140 and a sliding coating 130 are provided, wherein the sliding coating 130 is preferably formed on the hard coating 140 that has been manufactured below.
[0040] The sliding coating 130 is preferably a lubricating coating and is mainly used to reduce friction and wear and reduce the friction heat generated during sawing. Thus, the shavings can be prevented from gelling and breaking up in the sawing area. The sliding function can be achieved by adding lubricant fillers (e.g. PTFE, graphite, oxides, etc.) to the actual coating formulation. The coating formulation can be implemented, for example, with a high-temperature resistant plastic material as a binder. For example, the sliding coating 130 can be applied to the substrate 114 of the circular saw blade 100 that has been masked in advance and / or to the hard coating 140 by means of known spraying methods.
[0041] The hard coating 140 can consist of nitrates of aluminum chromium (AlCrN), zirconium (ZrN) or carbon nitrates of titanium (TiN and TiCN), aluminum titanium (TiAlN and TiAlCN), silicon titanium (TiSiN and TiSiCN) and / or other combinations. Due to the presence of the sliding and hard coatings 130, 140 in the edge region 110, the service life of the circular saw blade 100 is significantly increased (see in particular Figure 6 ).
[0042] Figure 2 A circular saw blade 200 is shown, which corresponds geometrically to Figure 1The circular saw blade 100 is designed as a circular saw blade 200 and accordingly comprises a core region 104 with a radially adjacent edge region 110, which is separated from the core region by a boundary line 112. The core region 104 and the edge region 110 form a base body 114 with a fastening opening 150 of the circular saw blade 200. The base body 114 is designed rotationally symmetrically with respect to the longitudinal center axis 120. The edge region 110 has (saw) teeth, wherein only one tooth Z3 is designated here for all the remaining teeth for better drawing clarity.
[0043] The core region 104 is also provided with a sliding coating 130, and the edge region is provided with a hard coating 140 and a sliding coating 130, wherein Figure 1 Unlike the circular saw blade 100 of FIG. 1 , the carbide cutting portion H3 of the tooth Z3 is at least partially provided with only a hard coating 140, as shown in the partial enlarged view II. The same applies to the remaining teeth and their associated carbide cutting portions which are not marked or shown here.
[0044] Figure 3 A circular saw blade 300 is shown, which also corresponds schematically to the geometrical Figure 1 The circular saw blade 100 and Figure 2 The circular saw blade 200 is implemented in accordance with the present invention and therefore comprises a base body 114 having a core region 104 and an edge region 110 separated by a boundary line 112. The base body 114 has a fastening opening 150 which is configured concentrically with the longitudinal center axis 120. The core region 104 is again provided only with a sliding coating 130. The edge region 110 having the hard coating 140 and the sliding coating 130 adjoins the core region radially outwardly.
[0045] and Figure 1 and Figure 2 In contrast, tooth Z3 and all other unnumbered teeth are provided only with a hard coating 140, which extends radially inwards to an approximately circular transition line 164 extending in the edge region 110. The transition line 164 can extend radially outside, inside (as shown here by way of example) or coincident with the tooth root circle 160 of the tooth. The tooth root circle 160 coincides with the radially inwardly deepest region of the tooth root of the tooth gap between the teeth.
[0046] It can be seen in the detailed enlargement III that the tooth Z3 and its carbide cutting part H3 are provided only with the hard coating 140 radially inwardly up to the transition line 164. The same applies to all other teeth not marked.
[0047] The radial distance A between the transition line 164 and the root circle 160 preferably lies between a value of zero and the magnitude of the tooth height, which is defined herein as the radial distance H between the addendum circle 162 and the root circle 160 .
[0048] Figure 4A circular saw blade 400 is shown, which also corresponds geometrically to Figure 1 The circular saw blade 100 and Figure 2 Circular saw blade 200 and Figure 3 The circular saw blade 300 is designed as a circular saw blade 300 and accordingly has a base body 114 consisting of a core region 104 and an edge region 110 separated by a boundary line 112 and having teeth (only tooth Z3 is indicated here), the core region having a fastening opening 150 designed concentrically with the longitudinal center axis 120. The core region 104 is provided with only the sliding coating 130, while the edge region 110 (except for the carbide cutting part H n…9 and all other unmarked carbide cutting parts) are provided with sliding and hard coatings 130, 140. n…9 Only a hard metal coating 140 is formed thereon.
[0049] In contrast to the previous embodiments, the circular saw blade 400 now has an approximately V-shaped, radially inwardly directed, and uncoated slot 406 in the edge region 110 of the base body 114 starting from the tooth root G3. In order to avoid imbalance of the saw blade 400, a further slot (not shown here) is arranged diametrically opposite the slot 406. Accordingly, further slots can be provided in the region of two tooth roots of the teeth facing each other, taking into account rotational symmetry to avoid imbalance. In principle, any even number of slots between two teeth and a total of n teeth is possible.
[0050] The gaps each start from the "deepest" point of the respective tooth root in the region of the tooth root circle 160, which point is radially furthest inwards, and for better drawing clarity, only one of these points 408 is marked here. The gaps or their opposing walls, respectively, are free of any coating, i.e., neither a sliding coating nor a hard coating 130, 140, so as not to hinder any lateral movement of the saw blade 400 parallel to the longitudinal center axis 120. These lateral avoidance movements of the saw blade 400 also help to reduce vibrations and noise and reduce the risk of the saw blade 400 getting stuck during sawing.
[0051] In addition, by way of example, the saw blade 400 has at least two circumferential slots in the edge region 110 of the base body 114, which are oriented substantially in the circumferential direction 122 and are also uncoated, wherein only three circumferential slots 410, 412, 414 are shown here as a representation of all the remaining circumferential slots. The circumferential slots 410, 412, 414 are preferably spaced uniformly relative to one another in the circumferential direction 122 and are introduced into the base body 114 of the saw blade 400 at the same radial distance from the longitudinal center axis 120. Each circumferential slot 410, 412, 414 preferably has a hole on the end side, which is not marked for the sake of clarity of the drawing, in order to avoid mechanical stresses in the base body 114 of the saw blade 400. A further improvement in the sawing behavior, namely a particularly smooth cutting behavior of the circular saw blade 400, can be achieved by means of the circumferential slots 410, 412, 414.
[0052] All slots or circumferential slots 410, 412, 414 completely penetrate the base body 114 of the saw blade 400 in the axial direction or parallel to the longitudinal center axis 120. The circumferential slots 410, 412, 414 may also be at least partially arranged in the core region 104 or may extend radially inward from the edge region 110 into the core region 104.
[0053] Figure 5 A circular saw blade 500 is shown, which also corresponds schematically to the geometric shape of Figure 1 The circular saw blade 100 and Figure 2 Circular saw blade 200, Figure 3 Circular saw blade 300 and Figure 4 The circular saw blade 500 is implemented as a circular saw blade 400 and therefore also includes a core region 104 and an edge region 110 separated from each other by a boundary line 112. In order to drive the circular saw blade 500 in rotation in a cutting direction 124, the fastening opening 150 is arranged concentrically with the longitudinal center axis 120 of the circular saw blade 500. The teeth (of which only the tooth Z3 is marked) are uniformly spaced relative to each other in a circumferential direction 122 and are formed in the edge region 110 so as to point radially outwards. As in Figure 4 As shown in FIG, an uncoated gap 408 is provided, which again extends radially inwards from the lowest point of the tooth root circle 160 or tooth root G3 into the edge region 110. The core region 104 again has a sliding coating 130, while the edge region is provided with a hard coating 140 and a sliding coating 130 radially outwards up to a transition line 164. The tooth including its carbide cutting part is again treated only with a hard coating 140 radially inwards up to a transition line 164, wherein the transition line 164 extends at a radial distance A relative to the tooth root circle 160 (see also FIG. Figure 3 ).
[0054] In contrast to the previously described embodiments, the base body 114 of the circular saw blade 500 now has at least two additional, uncoated and diametrically positioned slot components located within the core region 104. Of the at least two slot components, only one slot component 506 is indicated here to represent all the remaining slot components. The slot component 506 has an approximately V-shaped circumferential slot 510, which has a longer section 514 oriented essentially in the circumferential direction 122 and a shorter section 518 extending radially outwardly at an angle relative to the circumferential direction 122. An angle α of the order of magnitude of, for example, 60° exists between the longer section 514 and the shorter section 518 of the circumferential slot 510. In addition, a slot 522 is preferably arranged approximately centrally on the longer section 514, which slot extends approximately parallel to the shorter section 518 of the circumferential slot 510 and is preferably shorter than the shorter section.
[0055] Due to the slot assembly 506 and all slot assemblies not shown, a further lateral movement possibility of the circular saw blade 500 relative to the drawing plane or parallel to the longitudinal center axis 120 is achieved.
[0056] Figure 6 A diagram 600 is shown for illustrating the Figures 1 to 5 Service life of a circular saw blade according to the embodiment described in . Along the abscissa of the diagram 600 three bars with different types of coating of circular saw blades are plotted, while the ordinate visually shows the service life 610 of the circular saw blades thus achievable.
[0057] The left column represents the presence of only a sliding coating 130, the middle column represents the presence of only a hard coating 140, and the right column represents a saw blade with a combined sliding and hard coating 130, 140. The sliding coating 130 enables the service life of a circular saw blade equipped in this way to be doubled compared to an untreated circular saw blade.
[0058] By virtue of the fact that the hard coating 140 and the sliding coating 130 overlap or are combined at least in regions with one another according to the invention, a three-fold increase in the service life can be achieved in advantageous cases compared to an untreated circular saw blade.
[0059] Furthermore, the invention relates to a handheld power tool, such as a handheld circular saw, a table circular saw or an oscillating circular saw, which is equipped with a circular saw blade according to one of the above-mentioned embodiments in order to increase the service life of the circular saw blade by up to three times compared to conventional circular saw blades.
Claims
1. A circular saw blade (100) having a substantially circular core region (104), which is surrounded by an edge region (110) adjoining the core region (104) radially outwardly in the region of a boundary line (112) to form a base body (114), wherein: The edge region (110) has a plurality of teeth (Z 1...n ), these teeth have tooth surfaces (B 1...n ), and each tooth surface (B 1...n ) are equipped with carbide cutting parts (H 1...n ), and wherein the teeth (Z 1...n ) form tooth grooves (L 1...n ), characterized in that a friction-reducing sliding coating (130) and a wear-reducing hard coating (140) are provided which are constructed at least in regions overlapping one another.
2. The circular saw blade according to claim 1, characterized in that The core region (104) is provided with the sliding coating (130), and the edge region (110) is provided with the hard coating (140) and the sliding coating (130).
3. The circular saw blade according to claim 1, characterized in that The core region (104) is provided with the sliding coating (130), and the edge region (110) is provided with the hard coating (140) and the sliding coating (130), wherein the cemented carbide cutting portion (H 1...n ) is provided with only the hard coating (140) at least in some areas.
4. The circular saw blade according to claim 1, characterized in that The core region (104) is provided with only the sliding coating (130), while the edge region (110) is provided with the hard coating (140) and the sliding coating (130) radially outwardly connected to the core region, wherein the tooth (Z 1...n ) is provided with only the hard coating (140), and the hard coating (140) of the tooth extends radially inwardly to a preferably circular transition line (164) extending in the edge region (110), wherein the transition line (164) is axially spaced from the tooth (Z 1...n ) extends radially outward, inward, or coincident with the root circle.
5. Circular saw blade according to any one of the preceding claims, characterized in that The circular saw blade (400) has at least two tooth roots (G 1...n ) each having a substantially V-shaped gap (406) pointing radially inwards and without coating.
6. The circular saw blade according to claim 5, characterized in that At least two approximately V-shaped circumferential slots (410, 412, 414) are provided in the edge region (110), are oriented substantially in a circumferential direction (122), are uncoated and are preferably located in the edge region (110).
7. The circular saw blade according to claim 5 or 6, characterized in that: At least two uncoated gap components (506) are disposed in the core region (104).
8. The circular saw blade according to claim 7, characterized in that The at least two gap assemblies (506) each have an approximately V-shaped circumferential gap (510), wherein a longer section (514) of the circumferential gap extends substantially along a circumferential direction (122) and a shorter section (518) of the circumferential gap extends radially outwardly at an inclination relative to the circumferential direction (122), wherein a shorter gap (522) is formed on the longer section (514).
9. Circular saw blade according to any one of the preceding claims, characterized in that The core region (104) of the circular saw blade (100, 200, 300, 400, 500) has a fastening opening (150) for a drive shaft, and the fastening opening (150) is arranged concentrically with the longitudinal center axis (120) of the circular saw blade.
10. A circular saw blade according to any one of the preceding claims, characterised in that The core region (104) and the edge region (110) of the base body (114) are integrally formed of tempered steel, and the cemented carbide cutting portion (H 1...n ) is preferably composed of tungsten carbide-cobalt cemented carbide.
11. Circular saw blade according to any one of the preceding claims, characterized in that The cemented carbide cutting part (H 1...n ) and the corresponding tooth surface (B 1...n ) is fixedly connected, in particular thermally joined, to the tooth surface.
12. A hand-held power tool, in particular a hand-held circular saw or a table circular saw, having a circular saw blade (100, 200, 300, 400, 500) according to any of the preceding claims.