JP2015083326A - Rotary saw blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary saw blade capable of stably cutting a cutting object, by restraining lateral swinging and meandering in cutting.SOLUTION: The rotary saw blade comprises a plurality of cutting blades on he outer peripheral edge of base metal, a raking-out projection part positioned between the adjacent cutting blades and a plurality of blade bags respectively different in a shape. The raking-out projection part is positioned on the rotational center side of the base metal to the cutting blade. The upper end (an end part on the opposite side of the rotational center) of the raking-out projection part overlaps and contacts with the lower end (an end on the rotational center side) of the cutting blade when assuming that the raking-out projection part and the cutting blade are positioned in the same circumferential directional position, or is positioned on the more rotational center side. The raking-out projection part restrains the lateral swinging and the meandering of the rotary saw blade together with the blade bag, and realizes stable cutting of the cutting object. The raking-out projection part can also comprise a raking-out blade. The cutting blade, the raking-out projection part and the blade bag are arranged on the outer peripheral edge of the base metal by repeating a repeating unit.

Description

The present invention is attached to a rotating shaft of a motor or the like, and is used for grooving or cutting woody materials such as general wood and plywood, non-ferrous metal materials such as aluminum and copper, and synthetic resin materials. Related to a rotating saw blade.

In general, a rotary saw blade for grooving and cutting wood, metal, etc., is provided with a plurality of cutting blades and blade bottoms (blade bags) alternately on the outer periphery of a disk-shaped base metal. At the time of cutting, cutting waste and chips generated by cutting with the cutting blade are guided to the blade bag, stored there, and discharged to the outside. For this purpose, the shape of the rake face of the cutting blade is tapered so that the width of the upper side is slightly larger than the width of the lower side, and the blade thickness of the cutting blade (specified by the width of the upper side) is made larger than the base metal thickness. A clam is formed, and using this clam, the cutting waste is guided in the direction of the blade bag and discharged. If the cutting waste cannot be discharged well, the cutting waste will enter between the rotary saw blade and the cutting surface of the workpiece, which not only reduces the cutting efficiency, but also prevents the rotary saw blade from rotating. This is because it causes the blades to oscillate and meander, and causes a knife mark on the cut surface of the workpiece. However, simply forming the blade bag in addition to the clam does not necessarily result in sufficient discharge of the cutting waste, and problems such as the above-mentioned rolling still remain. For this reason, an attempt has been made to discharge cutting waste more effectively by devising the shape and the like of the blade bag.

For example, in Patent Document 1, in order to prevent cutting waste from entering between the rotary saw blade and the cutting surface of the workpiece and causing the meander of the rotary saw blade, the outer peripheral edge of the rotary saw blade It has been proposed that an inclined surface gradually approaching the center of rotation is formed in the blade bottom portion (blade bag) formed in the step as it is separated from the cutting surface of the workpiece. That is, it is proposed that the surface that defines the blade bag of the rotary saw blade (the surface in the thickness direction of the saw blade) is inclined toward the center of rotation from one rotary surface of the rotary saw blade to the other rotary surface. . By utilizing this inclination, the cutting waste is more effectively discharged, and it is intended to suppress the cutting waste from staying between the rotary saw blade and the cutting surface of the workpiece. However, from the viewpoint of preventing the rolling saw blade from rolling and meandering, the discharge of cutting waste is an extremely important factor, but it is doubtful whether it can sufficiently prevent rolling and meandering. In addition to innovations such as the shape of the blade bag, more aggressive measures for rolling and meandering are required.

JP-A-7-323402

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rotary saw blade capable of performing stable cutting of a workpiece by suppressing rolling and meandering during cutting. And

In order to achieve the above-described object, according to one aspect of the present invention, in a rotary saw blade, a disk-shaped base metal having a center of rotation and rotated in a predetermined rotation direction, and an outside of the base metal 1st and 2nd cutting blades arranged at the periphery, which define a certain angle range of the base metal with the rotation center as the center, respectively, first and second in the rotation direction front and rear, respectively. A cutting blade and a first blade bag, a third cutting blade, a second blade bag, and a scrape arranged in order from the front in the rotational direction between the first and second cutting blades on the outer periphery. A protruding portion and a third blade bag, wherein the scraping protruding portion is positioned closer to the rotation center than the first, second and third cutting blades, and the upper end of the scraping protruding portion is temporarily The scraping protrusion and the first, second, or third cutting blade are located at the same circumferential position. And assuming that the lower end of the first, second, or third cutting blade overlaps, touches, or is positioned closer to the center of rotation than the lower end, the first cutting blade, A 1st blade bag, a 3rd cutting blade, a 2nd blade bag, a protrusion protrusion part, and a 3rd blade bag comprise a repeating unit, and a blade and a blade bag in the said outer periphery by repeating the said repeating unit Is provided, wherein the second cutting blade is provided with a rotary saw blade that constitutes the first cutting blade of the subsequent repeating unit.

Preferably, the scraping protrusion includes a scraping blade.

Preferably, the first, second and third blade bags have different shapes from each other, and the bottom portions of the first, second and third blade bags are more than the lower end of the scraping protrusion. Located on the center of rotation.

Preferably, an interval between the first cutting blade and the third cutting blade is greater than or equal to an interval between the third cutting blade and the second cutting blade, The bottom part of the first blade bag is located closer to the rotation center than the bottom parts of the second and third blade bags.

Preferably, the scraping protrusion is positioned closer to the second cutting blade than the third cutting blade.

Preferably, between the first and second cutting blades, one or more, or one set or two or more third cutting blades in the rotational direction rearward of the third blade bag , A second blade bag, a scraping protrusion, and / or a third blade bag are added, and this is used as a repeating unit.

Preferably, an equilateral triangle having apexes on the outer peripheral edge of the base metal is rotated around the rotation center of the base metal, and an odd number of equilateral triangles is drawn at equal intervals, The first, second and third cutting blades are arranged at selected vertices of the number of equilateral triangles.

According to another aspect of the present invention, in the rotary saw blade, a disk-shaped base metal having a rotation center and rotated in a predetermined rotation direction, and a plurality of disposed at the outer peripheral edge of the base metal A cutting blade, a scraping protrusion positioned between adjacent cutting blades, a cutting blade positioned forward in the rotational direction of the adjacent cutting blades, and a first blade formed between the scraping protrusions A bag and a second blade bag formed between the cutting blade located behind the rotating blade of the adjacent cutting blades and the scraping protrusion, wherein the scraping protrusion is adjacent to the scraping protrusion. When it is assumed that the upper end of the scraping protrusion is positioned at the rotational center side of the cutting blade, and the upper end of the scraping protrusion is positioned at the same circumferential position as one or the other of the scraping protrusion and the adjacent cutting blade, Or overlap with the lower edge of the other cutting blade Contact, or the is to be positioned on the rotation center side than the lower end, the rotating saw blade is provided.

Preferably, the scraping protrusion includes a scraping blade.

Preferably, an equilateral triangle having apexes on the outer peripheral edge of the base metal is rotated around the rotation center of the base metal, and an odd number of equilateral triangles is drawn at equal intervals, The plurality of cutting blades are arranged at the vertices of the number of equilateral triangles.

According to the present invention, in addition to the blade bag, since the protruding portion is provided on the outer peripheral edge of the rotary saw blade, it is possible to more effectively suppress the rolling and meandering of the rotary saw blade, thereby stabilizing the work to be cut. Cutting can be performed. In addition, by providing a scraping blade on the scraping protrusion, it is possible to cut the knife mark and improve the surface accuracy of the cut surface of the workpiece.

Other objects and advantages of the invention will be apparent from the following description, the accompanying drawings, and the appended claims.

It is a front view which shows the principal part of the rotary saw blade which concerns on the 1st Embodiment of this invention. It is a front view which shows the principal part of the rotary saw blade which concerns on the 2nd Embodiment of this invention. It is a front view which shows the principal part of the rotary saw blade which concerns on the 3rd Embodiment of this invention. It is a side view which shows the cutting blade and scraper blade which concern on another embodiment of this invention. It is a conceptual diagram for demonstrating the arrangement method of a blade and a blade bag which can be used suitably in the rotary saw blade which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing a main part of the rotary saw blade according to the first embodiment of the present invention. The rotary saw blade 1 includes a disk-shaped base metal 3, a cutting blade 5 provided on the outer peripheral edge of the base metal, a scraping blade 7, and blade bags 9, 11, and 13. For example, the base metal 3 is 660 mm in diameter (diameter between cutting blade edges) and has a thickness of 6 mm. However, these dimensions are merely illustrative and not limiting. The cutting blade 5 and the scraping blade 7 are integrally fixed to the pedestals 15 and 17 by brazing or the like, as in the prior art. The cutting blade 5 is made of a known super hard material such as tungsten carbide, diamond sintered body (PCD), cubic boron nitride (CBN), and the scraping blade 7 is also made of the same super hard material as the cutting blade 5. Is formed. The base metal 3 is made of SK material (tool carbon steel) or the like. The rake face 19 of the cutting blade 5 has a tapered shape whose upper side is slightly larger than the lower side when viewed from a direction f parallel to the drawing, as in the prior art. Due to the difference between the blade thickness of the cutting blade 5 defined by this upper side and the thickness of the base metal 3 smaller than this, the claws are formed, and the cutting waste generated by the cutting is collected in the blade bags 9, 11, 13; It is trying to discharge. The base metal 3 has a shaft hole formed at the center of rotation (not shown). A rotation shaft such as a motor is fixed to the shaft hole, and is rotated at a high speed in the direction of the arrow R, so that a workpiece such as wood or metal is cut. Cutting and cutting.

In FIG. 1, between two cutting blades (cutting blades whose cutting edges are located on the lines P1 and P2 respectively) 5 defining an angle range of 40 ° from the center line P1 to the line P2 of the base metal 3, Three cutting blades 5 and three scraping blades 7 are alternately arranged on the left side. A front blade bag 9 is formed between each scraping blade 7 and the cutting blade 5 forward in the rotational direction, and between each scraping blade 7 and the cutting blade 5 behind the rotational direction. The rear blade bag 11 is formed. Further, between the cutting blade 5 whose cutting edge is located on the line P <b> 2 on the right side of the drawing (hereinafter simply referred to as “cutting blade on P <b> 2”) 5 and the subsequent cutting blade 5, the toothed blade bag 13. Is formed.

Each cutting blade 5 and each scraping blade 7 have different height positions in the radial direction, and the scraping blade 7 is referred to as a rotation center of the base metal 3 (hereinafter sometimes simply referred to as “rotation center”) rather than the cutting blade 5. .) Side. Assuming that the cutting blade 5 and the scraping blade 7 are located at the same circumferential position, the upper end of the scraping blade 7 (the end opposite to the rotation center of the scraping blade) The lower end of the cutting blade 5 (the end portion on the rotation center side of the cutting blade) is determined so as to be in contact with the lower end of the cutting blade or positioned closer to the rotation center than the lower end of the cutting blade. In this embodiment, the position of the scraping blade 7 is about 15 mm from the virtual circumference C (see FIG. 2) connecting the cutting edges of the cutting blade to the rotation center side in order to ensure an appropriate amount of cutting of the cutting blade 5. However, it is preferable that the upper end of the scraping blade is positioned. Further, in FIG. 1, the bottom portion of the front blade bag 9 that is curved downward on the right side of the scraping blade 7 is positioned on the rotation center side with respect to the lower end of the scraping blade 7, and is curved downward on the left side of the scraping blade 7 in the drawing. The bottom portion of the rear blade bag 11 is located closer to the center of rotation than the bottom portion of the front blade bag 9, and the bottom portion of the toothed blade bag 13 that is curved downward and has a large circumferential width is further than the bottom portion of the rear blade bag 11. Located on the center of rotation. Further, if the distance between two cutting blades 5 adjacent to each other with the scraping blade 7 (and the front blade bag 9 and the rear blade bag 11) is 1P (the center of the drawing), the cutting blade 5 on the line P2 and this The distance to the cutting blade 5 following is set to 1.5P, which is 1.5 times 1P. However, these values can be appropriately selected depending on the material to be cut.

As described above, in the present embodiment, the cutting blade 5 on the P2, the toothed blade bag 13, the cutting within the angle range defined by the cutting blade 5 on the P1 and the cutting blade 5 on the P2 from the right side of the drawing. Blade 5, front blade bag 9, scraper blade 7, rear blade bag 11, cutting blade 5, front blade bag 9, scraper blade 7, rear blade bag 11, cutting blade 5, front blade bag 9, scraper blade 7, rear blade Bags 11 are positioned in this order. In the present embodiment, the cutting blade 5, the dispensing blade 7, and the blade bag 9, 11, 13 constitute a repeating unit A of the blade and blade bag disposed on the outer peripheral edge of the base metal 3, In the illustrated example, this repeating unit is repeated nine times to form a base metal blade and blade bag. In this case, the cutting blade 5 on the line P1 constitutes the cutting blade 5 (corresponding to the cutting blade 5 on the line P2) at the forefront in the rotation direction in the subsequent repeating unit.

Here, a blade and a blade bag can also be arrange | positioned in the outer periphery of the base metal 3 using another repeating unit. Specifically, in FIG. 1, the angle range defined by the cutting blade 5 on the line P2 and the cutting blade 5 whose cutting edge is located on the line P3 (hereinafter simply referred to as “the cutting blade on P3”). The cutting blade 5 on the line P2, which is located inside, the toothing blade bag 13, which follows this, the cutting blade 5, the front blade bag 9, the scraping blade 7, and the rear blade bag 11, are repeated in the unit B. It can be. In this case, the cutting blade 5 on the line P3 constitutes the cutting blade 5 (corresponding to the cutting blade 5 on the line P2) that is the forefront of the next repeating unit in the rotation direction. This repeating unit B is a basic repeating unit in the present embodiment. By repeating this, the blade and the blade bag can be disposed on the outer peripheral edge of the base 3. In addition, the basic repeating unit B includes another one or more or one or two or more sets of cutting blades 5, front blade bags 9, scraping blades 7 and / or rear blade bags 11 as repeating units. It can also be added to the rear of the rear blade bag 11 in the rotational direction of B and used as a repeating unit. For example, two sets of cutting blades 5, a front blade bag 9, a scraping blade 7, and a rear blade bag 11 can be added to form a repeating unit A in FIG. Moreover, a blade and a blade bag can also be arrange | positioned in the outer periphery of the base metal 3 combining different repeating units, for example, repeating unit B and A. FIG. Which repeating unit is selected and in which angle range the repeating unit is repeated can be determined in consideration of the material of the workpiece to be cut or cut.

The scraping blade 7 suppresses vibration (rolling) and meandering of the base metal 3 when cutting the workpiece, so that the cutting edge of the cutting blade 5 can perform stable cutting. The scraping blade 7 is located in a groove formed by cutting on the workpiece by the cutting blade 5 at the time of cutting, and tries to prevent the base metal 3 from rolling in cooperation with the side wall of the groove. By positioning such a scraping blade 7 closer to the center side of the base metal 3 than the cutting blade 5, the roll of the entire base metal is suppressed and stable cutting with the cutting blade is possible. Further, at that time, the toothed blade bag 13 having a larger circumferential width located at the rotation center side than the bottom portions of the blade bags 9 and 11 and the bottom portion located at the rotation direction center side from the lower end of the scraping blade 7. The blade bags 9 and 11 collect cutting scraps, retain them there, and prevent them from entering between the base metal 3 and the cutting surface of the workpiece, so that the combination with the scraping blade 7 is more effective. Therefore, the rolling of the rotary saw blade can be prevented. The scraper blade 7 also has a function of scraping or fluttering off cutting scraps that hit the scraper blade when the workpiece is cut, as the name suggests. The cutting scraps that have not been scraped off are stored in the blade bags 9, 11 (and 13). Further, the scraping blade 7 has a function of cutting the surface when the cutting blade 5 rolls and a knife mark is formed on the cutting surface of the workpiece, thereby increasing the surface accuracy of the cutting surface. Therefore, if importance is attached to the roll preventing function and the scraping function of the scraping blade 7, it is not necessary to form the scraping blade 7 with a super hard material similar to the cutting blade 5, and the radial direction is simply between the two cutting blades 5. It can also be a scraping protrusion protruding outward. The scraping protrusion can be made of, for example, the SK material or other material similar to the base metal 3. In that case, the amount of super hard material such as tungsten carbide used can be reduced. However, in consideration of the cutting function of the knife mark, it is preferable to provide the scraping blade 7 by providing the scraping protrusion with a blade made of a super hard material similar to the cutting blade 5. In addition to the above-described functions, the blade bags 9, 11, and 13 are not limited to the base metal generated by the impact or friction transmitted in the circumferential direction of the base metal 3 when the workpiece is broken or cut by the cutting blade 5. It also plays a role in absorbing thermal expansion.

The rake face 21 of the scraping blade 7 can have the same shape as the rake face 19 of the cutting edge 5. That is, the upper side width can be a taper shape that is slightly larger than the lower side width. Alternatively, unlike the rake face 19 of the cutting blade 5, conversely to the above, the width of the lower side may be a tapered shape larger than the width of the upper side, or may be a rectangle having the same width of the upper side and the lower side. The width dimension (the length of the upper side and / or the lower side) can be the same as or slightly larger than the width dimension of the rake face 19 of the cutting blade 5 from the viewpoint of cutting the knife mark. However, the vertical dimension of the rake face 21 of the scraping blade 7 is preferably shorter than the vertical dimension of the rake face 19 of the cutting blade 5, as shown in FIG. This is to prevent resistance to rotation of the rotary saw blade 1 and to improve the removal of the cutting waste. Further, the rake angle of the scraping blade 7 is set to be smaller than the rake angle 25 ° (see FIG. 1) of the cutting blade 5. This is because the scraping blade 7 is located at a position that follows the cutting blade 5 from the viewpoint of cutting the workpiece. Note that the rake angle 25 ° of the cutting blade 5 is merely an example for convenience of explanation, and it is possible to appropriately set various angles as the rake angle (and other angles) of the cutting blade and the scraping blade. Needless to say. Further, in the illustrated example, the scraping blade 7 is disposed closer to the cutting blade 5 at the rear in the rotational direction among the two cutting blades 5 sandwiching the scraping blade. From the viewpoint of suppressing rolling during cutting of the workpiece, it is arranged closer to the cutting edge of the cutting blade 5. In addition, when using the above-mentioned scraping protrusion instead of the scraping blade 7, it is preferable to have the same shape and the same width as the scooping surface 19 of the cutting blade 5. The longitudinal dimension is preferably shorter than the cutting blade 5 as with the scraping blade 7.

FIG. 2 is a front view showing a main part of the rotary saw blade according to the second embodiment of the present invention. In FIG. 2, the rotary saw blade 1 ′ has each cutting blade 5 arranged at this pitch including the space between the cutting blade 5 on the line P <b> 2 and the subsequent cutting blade 5. The bag 13 ′ is also different from the rotary saw blade 1 of the first embodiment in that the width in the frequency dividing direction is small. The other points are the same as those of the rotary saw blade 1 of the first embodiment, and thus the same reference numerals are given and the description thereof is omitted. The equal pitch means that the distance between the cutting blade 5 on the line P2 and the cutting blade 5 immediately after this is the cutting blade 5 on the line P1 and the cutting blade 5 immediately before this. It is clear from the fact that it is 1P as well as the distance between. Also in the present embodiment, each cutting blade 5, the scraping blade 7, the front blade bag 9, the rear blade bag 11, and the tooth cutting blade bag 13 'are the cutting blade 5, the scraping blade 7 in the first embodiment, The front blade bag 9, the rear blade bag 11, and the toothed blade bag 13 have the same functions and actions. Also in the present embodiment, the bottom portion of the toothed blade bag 13 ′ is located closer to the center of rotation than the bottom portions of the front blade bag 9 and the rear blade bag 11. Further, as in the first embodiment, the repeating unit B ′ constitutes a basic repeating unit, and by repeating this, a blade and a blade bag can be formed on the outer peripheral edge of the base metal 3 ′. Further, one or more, or one set or two or more sets of cutting blades 5, front blade bags 9, scraping blades 7 and / or rear blades are arranged behind the rear blade bag 11 in the repeating unit B in the rotation direction. A bag 11 can be added and used as a repeating unit. For example, a repeating unit such as A ′ in FIG. 2 can be used. Further, different repeating units, for example, repeating units B ′ and A ′ can be combined into one repeating unit. As in the first embodiment, the distance between the cutting blade 5 on the line P2 and the cutting blade 5 immediately after this is 1.5, which is larger than the distance between the other cutting blades 5, When the toothed blade bag 13 having a large circumferential width is formed, it is suitable for cutting a large-diameter wood or the like, and the cutting blade 5 on the line P2 and immediately after this as in the present embodiment. When the cutting blades 5 including the subsequent cutting blades 5 are arranged at an equal pitch, it is suitable for cutting a relatively small-diameter wood or the like.

FIG. 3 is a front view showing a main part of a rotary saw blade according to the third embodiment of the present invention. The rotary saw blade 31 includes a disk-shaped base metal 33 and a plurality of cutting blades 35 disposed on the outer peripheral edge of the base metal. Between two adjacent cutting blades 35, a scraping blade 37 is provided near the cutting blade 35 at the rear in the rotational direction. A front blade bag 39 is formed between the scraping blade 37 and the cutting blade 35 forward in the rotational direction, and between the scraping blade 37 and the cutting blade 35 behind the rotational direction, A rear blade bag 41 is formed. The cutting blade 35 and the scraping blade 37 are integrally fixed to the pedestals 45 and 47 by brazing or the like, as in the prior art. The cutting blade 35 is formed of a known super hard material such as tungsten carbide, diamond sintered body (PCD), cubic boron nitride (CBN), and the scraping blade 37 is also made of the same super hard material as the cutting blade 35. Is formed. The base metal 33 is made of SK material or the like. Also in the present embodiment, due to the difference between the blade thickness of the cutting blade 35 and the thickness of the base metal 33 smaller than this, the cutting waste generated by cutting the workpiece is removed by the front blade bag 39 and They are collected in the rear blade bag 41 and discharged. The base metal 33 has a shaft hole formed at a rotation center (not shown), and a rotation shaft such as a motor is fixed to the shaft hole, and is rotated at a high speed in the direction of an arrow R to cut a workpiece such as wood or metal. Cutting and cutting.

In FIG. 3, the cutting blade 35 and the scraping blade 37 are different from each other in height in the radial direction. The scraping blade 37 has a rotational center of the base metal 33 (hereinafter sometimes simply referred to as “rotational center”) rather than the cutting blade 35. ”). Assuming that the cutting blade 35 and the scraping blade 37 are located at the same circumferential position, the upper end (the end opposite to the rotation center of the scraping blade) of the scraping blade 37 is assumed to be the position of the scraping blade 37. The lower end of the cutting blade 35 (the end on the rotation center side of the cutting blade) is determined so as to overlap or be positioned closer to the rotation center than the lower end of the cutting blade. In this embodiment, the scraping blade 37 is positioned at a position about 15 mm from the virtual circumference C connecting the cutting edges of the cutting blade to the rotation center side in order to ensure an appropriate amount of cutting of the cutting blade 35. It is preferable that the upper end of the blade is positioned. Here, the bottom portion of the blade bag 39 that is curved downward on the right side of the drawing blade 37 is located on the rotation center side of the lower end of the scraping blade 37, and the bottom portion of the blade bag 41 that is curved downward on the left side of the drawing blade 37 in the drawing. Is positioned further on the rotation center side than the bottom of the blade bag 39.

The scraping blade 37 suppresses vibration (rolling) and meandering of the base metal 33 when the workpiece is cut, so that the cutting edge of the cutting blade 35 can perform stable cutting. The scraping blade 37 is located in a groove formed by cutting on the workpiece by the cutting blade 35 at the time of cutting, and tries to prevent the base metal 33 from rolling in cooperation with the side wall of the groove. By positioning such a scraping blade 37 closer to the center side of the base metal 33 than the cutting blade 35, the rolling of the entire base metal is suppressed and stable cutting by the cutting blade 35 is enabled. Further, at that time, the front blade bag 39 and the rear blade bag 41 whose bottom portions are located closer to the rotation center side than the lower end of the scraping blade 37 collect the cutting waste and retain it there, cutting the base metal 33 and the work to be cut. Since the intrusion into the surface is suppressed, the rolling saw blade can be more effectively prevented from rolling by the combination with the scraping blade 37. The scraping blade 37 also has a function of scraping or blowing off cutting waste that hits the scraping blade when the workpiece is cut. Cutting scraps that have not been scraped off are stored in the blade bags 39 and 41. Further, the scraping blade 37 has a function of increasing the surface accuracy of the cutting surface by cutting the blade when the cutting blade 35 rolls and a knife mark is formed on the cutting surface of the workpiece. Accordingly, if importance is attached to the roll preventing function and the scraping function of the scraping blade 37, the scraping blade 37 does not need to be formed of a super hard material similar to the cutting blade 35, and is simply formed between the two cutting blades 35 in the radial direction. It can also be a scraping protrusion protruding outward. The scraping protrusion can be made of, for example, the SK material or other material similar to the base metal 33. However, in consideration of the cutting function of the knife mark, it is preferable that the scraping protrusion 37 is provided with a blade made of a super hard material similar to the cutting blade 35 to form the scraping blade 37. In addition to the above-described functions, the blade bags 39 and 41 have a thermal expansion of the base metal caused by the impact or friction transmitted in the circumferential direction of the base metal 33 at the time of cutting or cutting of the workpiece by the cutting blade 35. Also plays a role to absorb.

The rake face 51 of the scraping blade 37 can have the same shape as the rake face 49 of the cutting edge 35. That is, the upper side width can be a taper shape that is slightly larger than the lower side width. Alternatively, unlike the rake face 49 of the cutting blade 35, conversely to the above, it may be tapered such that the width of the lower side is larger than the width of the upper side, or may be a rectangle having the same width of the upper side and the lower side. The width dimension (the length of the upper side and / or the lower side) can be equal to or slightly larger than the width dimension of the rake face 49 of the cutting blade 35 from the viewpoint of cutting the knife mark. However, the vertical dimension of the rake face 51 of the scraping blade 37 is preferably smaller than the vertical dimension of the rake face 49 of the cutting blade 35 as shown in FIG. This is to prevent resistance to the rotation of the rotary saw blade 31 and to improve the removal of cutting waste. Further, the rake angle of the scraping blade 37 is set smaller than the rake angle 25 ° (see FIG. 3) of the cutting blade 35. This is because the scraping blade 37 is located at a position that follows the cutting blade 35 when viewed from the cutting function of the workpiece. Note that the rake angle 25 ° of the cutting blade 35 is merely an example for convenience of explanation, and various angles can be appropriately set as the rake angle (and other angles) of the cutting blade and the scraping blade. Needless to say. In addition, when using the above-mentioned scraping protrusion instead of the scraping blade 37, it is preferable to have the same shape and the same width dimension as the rake face 49 of the cutting blade 35. The vertical dimension is preferably shorter than the cutting blade 35 as with the scraping blade 37. In the present embodiment, the cutting blades 35 and the scraping blades 37 are alternately disposed, but one scraping blade may be disposed for every two or more cutting blades.

In each of the above-described embodiments, the scraping blades 7 and 37 are arranged such that the upper ends thereof are in contact with the lower ends of the cutting blades 5 and 35 so as to overlap with each other, or the cutting blades It demonstrated as being located in the rotation center side rather than the lower end of. However, as clearly shown in FIG. 4 showing the cutting blade 55 and the front scraping blade 57 in a side view, the lower end of the scraping blade 57 and the lower end of the cutting blade 55 can be arranged at the same height position. Also in this case, the scraping blade 57 has the same operation and function as the scraping blades 7 and 37 of the above-described embodiments. Here, as an example, the dimensions of the rake face of the cutting blade 55 and the scraping blade 57 shown in the figure are as follows. The rake face 58 of the cutting blade 55 has an upper side and a lower side having width dimensions of 4.8 mm and 4.32 mm, respectively. The vertical dimension is 14 mm. The scooping surface of the scraping blade 57 has the same shape as the scooping surface 58 of the cutting blade 55, the width of the upper side is the same as the width dimension of the middle height of the cutting blade 55, and the width of the lower side is the cutting blade. Is the same as 4.32. As described above, since the vertical dimension is preferably shorter than the vertical dimension of the cutting blade, in this example, it is 7 mm, which is exactly half of the cutting blade 55. In the figure, 59 is a base metal, and 61 is a clam formed by the difference between the blade thickness defined by the width of the upper side of the cutting blade 55 and the thickness of the base metal.

FIG. 5 is a conceptual diagram for explaining a method of arranging blades and blade bags that can be suitably used in the rotary saw blade according to the present invention. As an example, the disk-shaped base metal 63 of the rotary saw blade has a diameter of 255 mm to 740 mm. In this arrangement method, a plurality of equilateral triangles are drawn on the base metal 63, and at least cutting blades are arranged at the apexes of the equilateral triangles. Hereinafter, a specific description will be given with reference to FIG. First, a regular triangle t having each vertex on the outer peripheral edge of the base metal is drawn on the surface of the base metal 63. Next, the triangle t is rotated in the circumferential direction around the center of rotation of the base metal 63, for example, 8 ° to form a regular triangle t ′ having each vertex on the outer peripheral edge, and further shifted by 8 ° in the same manner. An equilateral triangle t ″ is obtained. In this way, the equilateral triangle t is rotated by an equiangular angle of 8 °, and although not shown, a total of 45 equilateral triangles are formed. Each of the vertices on the circle has a vertices, and the cutting blades are arranged at the vertices of the equilateral triangles formed in this manner so that the cutting edges of the cutting blades are located, and the rotary saw blades are manufactured. As can be seen, since it is resistant to external forces and external pressures such as impact, the cutting blades arranged in this way can perform stable cutting, and have the effect of suppressing vibration and suppressing lateral vibration. Thus, when making a rotary saw blade, the number of equilateral triangles is odd. Also in this example, as described above, the surface of the base metal 63 is divided by 8 ° to draw a total of 45 equilateral triangles. This is because such a triangle is connected to a quadrilateral as shown by a symbol s in Fig. 3 and it is difficult to obtain the strength obtained by the triangle. In the case where the arrangement is not performed at the same time, or even when the scraping blades and blade bags are arranged at the vertices of the equilateral triangle, a larger odd number of equilateral triangles, and therefore, the vertices of the equilateral triangle are arranged at equal intervals on the outer circumference of the base metal 63. A cutting blade, a scraping blade, and / or a blade bag can be formed at selected vertices among them, where DD and EE are vertical and horizontal centers passing through the center. Is a line.

While the preferred embodiments of the invention have been illustrated and described, they are merely exemplary and are not to be construed as limiting the scope of the invention. Many variations and modifications can be made from the description in this document without departing from the spirit and scope of the present invention, and these variations and modifications are included in the scope of protection of the present invention. Should be interpreted.

DESCRIPTION OF SYMBOLS 1 Rotating saw blade 3 Base metal 5 Cutting blade 7 Scraping blade 9 Front blade bag 11 Rear blade bag 13 Gutter blade bag 15 Base 17 Base 19 Rake surface 21 Rake surface 31 Rotary saw blade 33 Base 35 Cutting blade 37 Scraping blade 39 Front blade bag 41 Rear blade bag 45 Base 47 Base 49 Rake face 51 Rake face 55 Cutting blade 57 Rake blade 58 Rake face 59 Base 61 Crest 63 Base

Claims (10)

In the rotary saw blade,
A disk-shaped base metal having a rotation center and rotated in a predetermined rotation direction;
1st and 2nd cutting blades arranged at the outer periphery of the base metal, each of which defines a certain angle range of the base metal around the rotation center, respectively in the rotational direction front and rear. First and second cutting blades;
A first blade bag, a third cutting blade, a second blade bag, a scraped protrusion, a first blade bag, which are arranged in order from the front in the rotational direction between the first and second cutting blades on the outer peripheral edge. 3 blade bags,
The scraping protrusion is positioned closer to the rotation center than the first, second, and third cutting blades, and the upper end of the scraping protrusion is temporarily connected to the scraping protrusion and the first, second, or second. When the three cutting blades are assumed to be located at the same circumferential position, they overlap with or touch the lower ends of the first, second, or third cutting blades, or are located closer to the rotation center than the lower ends. And
The first cutting blade, the first blade bag, the third cutting blade, the second blade bag, the scraping protrusion, and the third blade bag constitute a repeating unit, and the repeating unit is repeated to A rotary saw blade in which a blade and a blade bag are disposed on an outer peripheral edge, wherein the second cutting blade constitutes the first cutting blade of a subsequent repeating unit. The rotary saw blade according to claim 1,
The scraping protrusion is a rotary saw blade provided with a scraping blade. The rotary saw blade according to claim 1,
The first, second, and third blade bags have shapes different from each other, and the bottom portions of the first, second, and third blade bags are closer to the rotation center than the lower ends of the scraping protrusions. Located in a rotating saw blade. The rotary saw blade according to claim 1,
An interval between the first cutting blade and the third cutting blade is greater than or equal to an interval between the third cutting blade and the second cutting blade, and the first cutting blade A rotary saw blade, wherein a bottom portion of the blade bag is positioned closer to the rotation center than the bottom portions of the second and third blade bags. The rotary saw blade according to claim 1,
The scraping protrusion is a rotary saw blade that is positioned closer to the second cutting blade than the third cutting blade. The rotary saw blade according to claim 1,
Between the first and second cutting blades and behind the third blade bag in the rotation direction, one or more, or one or two or more third cutting blades, second A rotary saw blade that adds a blade bag, a protruding protrusion, and / or a third blade bag and uses this as a repeating unit. The rotary saw blade according to claim 1,
A regular triangle having each vertex on the outer peripheral edge of the base metal is rotated around the rotation center of the base metal, and an odd number of regular triangles is drawn at equal intervals, and each odd number of regular triangles is drawn. A rotary saw blade in which the first, second and third cutting blades are arranged at selected vertices of an equilateral triangle. In the rotary saw blade,
A disk-shaped base metal having a rotation center and rotated in a predetermined rotation direction;
A plurality of cutting blades disposed on the outer peripheral edge of the base metal;
A scraping protrusion located between adjacent cutting blades;
A first blade bag formed between a cutting blade located in front of the rotation direction of the adjacent cutting blades and the scraping protrusion;
A cutting blade located behind the rotation direction of the adjacent cutting blades and a second blade bag formed between the scraping protrusions,
The scraping protrusion is positioned closer to the rotation center than the adjacent cutting blades, and the upper end of the scraping protrusion is temporarily positioned in the circumferential direction where the scraping protrusion and one or the other of the adjacent cutting blades are the same. A rotary saw blade that overlaps with, touches, or is positioned closer to the center of rotation than the lower end of the one or other cutting blade. The rotary saw blade according to claim 8,
The scraping protrusion is a rotary saw blade provided with a scraping blade. The rotary saw blade according to claim 8,
A regular triangle having each vertex on the outer peripheral edge of the base metal is rotated around the rotation center of the base metal, and an odd number of regular triangles is drawn at equal intervals, and each odd number of regular triangles is drawn. A rotary saw blade in which the plurality of cutting blades are arranged at each vertex of an equilateral triangle.

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