JP6037776B2 - Manufacturing method of rotary saw - Google Patents

Description

The present invention relates to a method of manufacturing a rotary saw configured by providing a plurality of cutting edges on the outer periphery of a disk-shaped base metal.

  Conventionally, a rotary saw has been used for cutting a workpiece made of metal, wood, resin material, or the like. This rotary saw is manufactured by changing the number and shape of the cutting edge as well as changing the diameter and thickness according to the type of workpiece to be cut. Further, in order to prevent the frictional resistance from increasing due to the inner peripheral side portion of the cutting edge located on the outer peripheral portion of the rotary saw coming into contact with the cutting surface of the workpiece during cutting, the cutting edge is generally attached to the cutting edge of the cutting edge. It is composed of an ultra-hard chip that is thicker than the inner peripheral part.

  When manufacturing such a rotary saw, first, a base metal member for forming a base metal constituting the main body of the rotary saw has a final thickness at which the vicinity of the outer peripheral edge of the base metal base becomes thinner. Then, a thick super-hard tip is joined by brazing to a portion where the cutting edge is formed in the vicinity of the cutting edge. And a rotary saw is obtained by grinding a super-hard chip into one having a set thickness and inclination angle. In addition, in the case of the same thickness of the blade edge vicinity and the base metal base, that is, in the case of a general rotary saw, similarly, a super hard tip is brazed to the base metal processed into a finished thickness, The cutting edge is ground.

  However, in such a method, since an ultra-hard tip is joined to the vicinity of the thin blade edge and ground, the base metal member lacks rigidity and the accuracy in the axial direction (blade thickness direction) of the blade edge is poor. In extreme cases, the vicinity of the blade edge may be damaged during grinding. For this reason, it is difficult to manufacture unless the blade edge portion and the blade edge have a certain thickness, for example, the blade edge is at least a thickness of about 0.5 to 1 mm. In addition, there is a rotary saw in which a portion other than the cutting edge is made thinner by etching the portion excluding the cutting edge without grinding the cutting edge in the rotating saw (see, for example, Patent Document 1). This rotary saw removes the saw blade with a saw blade from the heat-treated steel plate by etching, and then thins the portion of the saw blade except the blade edge of the saw blade by etching. Is formed by.

Japanese Patent Laid-Open No. 7-80722

  However, since the rotary saw described in Patent Document 1 described above is formed integrally with the same material as the part constituting the base metal, the blade tip is consumed heavily, and the life of the rotary saw is shortened. There is. In addition, this rotating saw manufacturing method also has a problem that it is difficult to form the cutting edge sharply because the cutting edge is formed by extracting the saw blade from the steel sheet for blades by etching.

The present invention has been made to address the above-described problems, and its purpose is to form a sharp and accurate shape without deformation even if it has a thin cutting edge or a vicinity of the cutting edge, and to reduce wear of the cutting edge. It is another object of the present invention to provide a method for manufacturing a rotary saw that can extend the service life. In the description of each constituent element of the present invention below, the reference numerals of corresponding portions of the embodiment are shown in parentheses in order to facilitate understanding of the present invention. The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the forms.

In order to achieve the above-described object, the structural features of the method of manufacturing a rotary saw according to the present invention include a disc-shaped base metal base (11) and a cutting edge vicinity part (on the outer periphery of the base metal base ( between the base metal (10a) consisting of a 12), a plurality of cutting edges formed portion formed on an outer circumferential portion of the cutting edge near part (13), from the ultra-hard tip joined to a plurality of cutting edges formed portion (14) A method for manufacturing a rotary saw (10) having a plurality of cutting edges (15) , wherein a portion (13a) constituting a plurality of cutting edge forming portions in a base metal member (18) for forming a base metal is predetermined. the thickness of the superhard chips (14a) to After joining respectively, the thickness and grinding the ultra-hard tip having a predetermined thickness with the outer peripheral portion of the portion forming the edge vicinity portion in the metal base member 0. forming a plurality of cutting edges of below 5 mm, after a plurality of cutting edges formed The thicker portion than the plurality of cutting edges in the portion forming the edge vicinity portion of the metal base member is to form a thinner clams than further processed removed to a plurality of cutting edges thickness.

In the method of manufacturing a rotary saw according to the present invention, first, a predetermined thickness (similar to the blade thickness) for forming the blade edge in a portion constituting the blade edge forming portion of the thick base metal member for forming the base metal After the super hard tip is joined, the super hard tip is ground together with the portion that forms the vicinity of the blade tip of the base metal member to form a cutting edge having a set thickness. . That is, both the ultra-hard chip and the base metal member are joined in a state thicker than the set thickness (thickness of the finished product), and the super-hard chip and the vicinity of the ultra-hard chip in the base metal member At the same time, the cutting edge is formed with a set thickness of the ultra-hard chip by grinding. At this time, it is preferable to grind all of the rake face, the tip face and the side face of the blade edge, but at least the side face is ground to a set thickness.

  In this case, the base metal member has a sufficient thickness to withstand the grinding process, so that the base metal member is not deformed during the grinding process. For this reason, various methods can be used as the grinding process, and mechanical grinding in which a force is directly applied to the base metal member can also be used. Also, other grinding methods can be used as long as they are a method capable of processing electric discharge grinding or an ultra-hard chip. Furthermore, the grinding process according to the present invention is preferably a mechanical grinding process in order to form the cutting edge sharply, among the methods described above.

  And, after forming the cutting edge, the cutting edge is left as it is, and the base metal constituting the cutting edge vicinity part and the central part of the base metal with the thickness set by performing processing to remove only the base metal member. And a base. In this case, since the base metal member has a lower rigidity than the ultra-hard chip and the thickness at the time of completion is reduced, as a removal process, for example, a method in which force is not applied to the base metal member such as an etching process. Is preferably used. Note that the thickness of the base metal base may be the same as that in the vicinity of the cutting edge or may be thicker than the cutting edge. In short, the thickness in the vicinity of the cutting edge is thinner than the cutting edge thickness, which is the thickness of the cutting edge, and it is sufficient that the work piece does not hit the base metal when the rotary saw is used. In addition, the superhard tip in the present invention includes cemented carbide (including cermet), polycrystalline diamond (PCD), polycrystalline hexagonal boron nitride (PCBN), and the like.

  According to the present invention, it is possible to obtain a rotary saw having an extremely thin and accurate cutting edge. According to the conventional technique, when the blade thickness is 0.5 mm or less, the thickness of the base metal needs to be 0.4 mm or less. However, when the base metal thickness is 0.4 mm or less, the rigidity of the cutting edge in the axial direction becomes insufficient when the rotary saw is attached to the clamp part of the cutting edge grinding apparatus. The problem remains. Therefore, in the case of the prior art, it is preferable that the thickness of the base metal exceeds 0.4 mm, that is, the blade thickness exceeds 0.5 mm.

Another structural feature of the method for manufacturing a rotary saw according to the present invention is that the grinding process for forming the plurality of cutting edges is mechanical grinding.

  According to the present invention, the cutting edge can be formed with high accuracy. In this case, it is necessary to simultaneously grind the side surfaces of the base metal member that form the vicinity of the blade edge and the ultra-hard tip by using a rotary grinding tool, and it is necessary to provide a lateral centroid angle and a lateral clearance angle. According to this, since the area of the part which contacts the cutting surface of the workpiece on the side surface of the cutting edge is reduced, the frictional resistance is reduced and the sharpness of the rotary saw is improved. Note that not only mechanical grinding but also electric discharge grinding requires resistance to the flow of the grinding fluid, so that the base metal member needs to have a certain degree of rigidity.

Still another structural feature of the method of manufacturing a rotary saw according to the present invention is that a portion (18a, 18b) thicker than the plurality of cutting edges in the portion forming the cutting edge vicinity portion of the base metal member is processed and removed. The removal processing to be formed is to be performed by an electrical or chemical processing method that does not directly apply the working force to the base metal member.

  In this case, electrical methods include electric discharge machining and electrolytic machining, and chemical methods include etching. According to the electrical or chemical processing method, an acting force is not directly applied to the base metal member as in machining. For this reason, according to the present invention, the base metal member thinned to some extent by grinding is processed without applying excessive force to damage or deform the base metal member, and the vicinity of the blade edge and the base with the set thickness. A gold base can be obtained.

Still another structural feature of the method of manufacturing a rotary saw according to the present invention is that the removal process is performed by an etching process.

  In the present invention, masking the portion of the base member forming the base base and the portion to be ground of the blade edge, and etching the unmasked portion of the portion of the base metal member forming the vicinity of the blade edge To form the vicinity of the blade edge and the base metal base. In this case, the part to be etched is removed by etching to a thickness slightly thicker than the set thickness, and then the masking of the part to be ground is removed, and further, the etching process is performed and set. It is preferable to form the vicinity of the blade edge of the thickness and the base metal base. According to the present invention, the vicinity of the blade edge can be formed with high accuracy. As a final step, when the entire base metal member is etched to form the base metal base and the blade edge vicinity in a set thickness, the base metal base is thickened to allow for the etching allowance. It is preferable to keep.

  Such etching processing is advantageous in terms of mass productivity, processing cost, and condition control as compared with electric discharge processing and electrolytic processing. For this reason, a favorable process can be performed by performing a removal process by an etching process. Further, the removal process for reducing the thickness of at least the vicinity of the cutting edge may be a method in which an acting force is applied by the process. In that case, it is desirable to fill the gap between the back side of the processing surface in the vicinity of the blade edge and the reference surface of the machine with a spacer during processing. When this is a slight gap, deformation due to the working force occurs, but since it is due to the spring back, it cannot be said that the cutting edge accuracy is bad when viewed from the base metal base. In short, it is important to perform cutting edge grinding in a state where the cutting edge vicinity and the base metal base are thick.

The rotary saw which concerns on one Embodiment of this invention is shown, (a) is a front view, (b) is a side view. It is the front view which expanded the outer peripheral part of the rotary saw shown in FIG. The base metal member and a part of the blade edge forming part formed on the outer periphery thereof are shown, (a) is a plan view, (b) is a front view, and (c) is a 3-3 cross-sectional view of (b). It is. The state which joined the ultra hard chip | tip to the blade edge | tip formation part of FIG. 3 is shown, (a) is a top view, (b) is a front view, (c) is 4-4 sectional drawing of (b). The state which grind | polished the edge part vicinity part and super hard chip | tip of FIG. 4 is shown, (a) is a top view, (b) is a front view, (c) is 5-5 sectional drawing of (b). FIG. 6 shows a state in which the base metal base is ground after masking the whole base metal member of FIG. 5, (a) is a plan view, (b) is a front view, and (c) is a 6-6 cross section of (b). FIG. FIG. 6 shows a state in which the base portion of FIG. 6 is masked and an unmasked portion in the vicinity of the cutting edge is etched, (a) is a plan view, (b) is a front view, and (c) is (b). 7-7 is a sectional view of 7-7. FIG. 8 shows a state in which a mask is removed from the state of FIG. 7 and then the whole is etched to form a rotary saw, where (a) is a plan view, (b) is a front view, and (c) is a view of (b). It is 8-8 sectional drawing.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1A and 1B show a rotary saw 10 according to this embodiment. The rotary saw 10 is formed at a predetermined pitch in a disc-shaped base metal base 11, a blade edge vicinity portion 12 formed of a convex portion and a concave portion formed on the outer peripheral portion of the base metal base portion 11, and a blade edge vicinity portion 12. Each of the plurality of cutting edge forming portions 13 is composed of a plurality of cutting edges 15 each formed by bonding a super hard tip 14 to each other. A shaft hole 16 is formed in the central portion of the base metal base 11. In addition, small slits 17 extending to the outer peripheral portion of the base metal base 11 are formed in predetermined recesses in the outer peripheral portion of the blade edge vicinity portion 12, and four slits 17 are maintained at substantially constant intervals in the circumferential direction. Is formed. Note that the number of the slits 17 is not limited to four and may not be provided. Further, the base metal base 11 and the blade edge vicinity portion 12 constitute a base metal 10 a that is a main body of the rotary saw 10.

  The rotary saw 10 is assembled to a clamp portion of a cutting device (not shown) through a shaft hole 16 to cut a workpiece, for example, a circuit board on which an electronic circuit or the like is mounted. In this case, it rotates in the clockwise direction in FIG. In the following description, the front and the rear are directions based on the rotation direction of the rotary saw 10 (clockwise direction in FIG. 1A). The directions used in the description of each part constituting the rotary saw 10 will be described as the outer peripheral side and the inner peripheral side in the radial direction of the rotary saw 10.

  The diameter of the rotary saw 10 (the diameter of the outer peripheral edge of the cutting edge 15 when the rotary saw 10 rotates) is set to 125 mm, and the diameter of the base metal base 11 is set to 113 mm. Further, the thickness of the base metal base 11 is set to 0.4 mm, the thickness of the blade edge vicinity portion 12 is set to 0.2 mm, and the thickness (blade thickness) of the blade edge 15 is set to 0.3 mm. The diameter of the shaft hole 16 is set to 40 mm. Further, 40 blade edges 15 are formed at regular intervals. The base metal 10a including the base base 11 and the blade edge vicinity 12 is integrally formed of a steel plate material made of carbon steel or alloy tool steel such as SK85, SKS5, SAE1074, DIN75Cr1. And in order not to deform | transform at the time of use, quenching and tempering processing is performed and it is made for hardness to become about Hv400-500.

  The blade edge vicinity part 12 is formed in the outer peripheral part of the base metal base 11, and as shown in FIG. 2, the tooth chamber 12a which consists of a recessed part, and the tooth back part 12b which consists of a convex part are arrange | positioned alternately, and is comprised. Has been. And between the rear part of the tooth chamber 12a and the front part of the tooth back part 12b, the blade edge | tip formation part 13 in which the shape of the edge seen from the front became L shape was formed. The edge located on the outer peripheral side of the tooth back portion 12b extends while inclining from the front end on the outer peripheral side toward the rear inner peripheral side, and then curves smoothly so as to draw a convex portion and continues to the front portion of the tooth chamber 12a. . The edge portion of the tooth chamber 12 a extends rearward so as to draw a substantially semicircular recess, and is continuous with the inner peripheral front end of the blade edge forming portion 13.

  The superhard tip 14 is made of a cemented carbide alloy obtained by mixing and sintering tungsten carbide and cobalt, and is made of a small, substantially rectangular member corresponding to the size of the blade edge forming portion 13. The shape of the super-hard chip 14 as viewed from the front is the state shown in FIG. 2, and the lower end of the right edge of the rectangle that is long in the vertical direction is chamfered to form an inclined part, and the right edge and the upper It has a shape with a sharp edge angle at the corner with the edge. Further, the shape of the super-hard chip 14 as viewed from the front is formed in a substantially rectangular shape that is long in the vertical direction and thin in the state shown in FIGS. 5C and 8C. The side face angle is set so that the thickness is slightly larger than the thickness on the lower end side. And the blade edge | tip vicinity part 12 is still thinner than the lower end part of the super-hard chip | tip 14, Thereby, the clam concerning this invention is formed.

  Further, the shape of the superhard chip 14 viewed from the outer peripheral side is formed in a substantially rectangular shape that is long on the left and right in the state shown in FIGS. 5A and 8A, and the thickness on the right side is on the left side. The side clearance angle is set to be slightly thicker than the thickness. That is, both side surfaces of the super-hard chip 14 are formed as inclined surfaces. The angle between the side surfaces is set to 0.3 ° as the side-facing angle as viewed from the front, and the side clearance angle as set to 0.5 ° as viewed from the outer periphery. ing. The above-described blade thickness of 0.3 mm is the thickness of the portion corresponding to the front end portion on the outer peripheral side of the super hard tip 14. As described above, by making the thickness on the outer peripheral side of the ultra-hard chip 14 larger than the thickness on the inner peripheral side, and making the thickness on the front side larger than the thickness on the rear side, smooth cutting becomes possible.

  Next, a method for manufacturing the rotary saw 10 configured as described above will be described. In this case, first, a base metal member 18 shown in FIGS. 3A to 3C was prepared. The base member 18 is formed of a plate member having the same shape as the base 10a of the rotary saw 10 shown in FIG. 1 and a thickness of 0.8 mm. In addition, a blade edge forming portion 13 a is formed on the outer peripheral portion of the base member 18 at regular intervals. Next, as shown in FIGS. 4A to 4C, the super hard tip 14a was joined to each blade edge forming portion 13a of the base member 18 by brazing. The super hard chip 14 a is set to 1.0 mm, which is substantially the same in shape as viewed from the front, and is thicker than the super hard chip 14.

  Next, the base metal member 18 to which the super-hard chip 14a is bonded is ground to form the super-hard chip 14a on the super-hard chip 14 having a thickness of 0.3 mm, which is a finished dimension. went. In this case, the grinding process is performed by attaching the base member 18 to the grinding device with the axial direction oriented in the horizontal direction, and setting the side surface of the super hard tip 14a on the outer peripheral side of the base member member 18 on the peripheral surface of the rotating grindstone. Done by grinding together with the part. As a result, the super-hard chip 14a and the base metal member 18 were formed on the super-hard chip 14 and the base metal member 18a shown in FIGS. Prior to grinding the side surface of the super hard tip 14a, the front end surface and the outer peripheral side end surface of the hard tip 14a were also ground to form a rake surface and a front end surface.

  By this grinding process, the ultra-hard chip 14a is formed into the final-shaped ultra-hard chip 14, and the base metal member 18 has an overall thickness of 0.8 mm, a central portion having a thickness of 0.8 mm, and an outer peripheral side. It was formed on a base metal member 18a having a thickness of about 0.3 mm. The boundary portion between the portion having a thickness of 0.8 mm and the portion having a thickness of 0.3 mm in the base metal member 18a is configured by an inclined portion whose thickness gradually decreases from the inner peripheral side toward the outer peripheral side. Moreover, the thin part 19 is formed in the surrounding part of the ultra-hard chip | tip 14 in the base metal member 18a ground by grinding. The minimum thickness of the thin portion 19 in the vicinity of the super hard chip 14 is slightly thinner than the thickness of the super hard chip 14 of 0.3 mm.

  Next, after masking the entire surface of the super-hard chip 14 and the base metal member 18a, the center portion of the base metal member 18a was ground and thinned. In this case, the masking is performed by applying acrylic paint to the entire surface of the super-hard chip 14 and the base metal member 18a by spraying and then heating at a temperature of 150 ° C. A masking layer having a thickness of about 20 μm was formed on the entire surface. And the thickness of the center part of the base metal member 18a was made into 0.8 mm from 0.5 mm by carrying out surface grinding of both surfaces.

  In this surface grinding, the super-hard chip 14 and the base metal member 18a whose entire surface is masked are attached to a turntable of a grinding apparatus in a state where the axial direction is vertical, and the base wheel member 18a is rotated while rotating the grinding wheel. This was performed by grinding the side surface of the base metal member 18a with the peripheral surface. As a result, the base metal member 18a was formed on the base metal member 18b having a thickness of 0.5 mm shown in FIGS. In addition, the thin part 19 of the base member 18a is formed in the thin part 19a whose area is reduced by shaving the peripheral side part at a position far from the super-hard chip 14. The masking layer M remains on the surfaces of the thin wall portion 19a and the super hard chip 14, and after forming the masking layer on the entire surface of the super hard chip 14 and the base metal member 18a, the base metal member 18a is subjected to surface grinding. Thus, the masking layer M can be left in an accurate range.

  Next, as shown in FIGS. 7A to 7C, the masking layer Ma is formed on the portion having a central diameter of 113 mm (the portion corresponding to the base 11) on both side surfaces of the base member 18b. In addition, after forming the masking layer Mb on the inner peripheral surface of the portion where the shaft hole 16 is formed, the portion not masked is thinned by etching. The masking layers Ma and Mb were formed in the same manner as the masking layer M.

Etching is performed by spraying and corroding the ultra-hard chip 14 and the base metal member 18b on which the masking layers M, Ma, and Mb are formed using an etching solution made of a ferric chloride solution, As a result, the thickness of the unmasked portion 18c of the base metal member 18b was set to 0.2 mm. As a result, the thickness of the entire outer peripheral side portion of the base metal member 18b (the portion corresponding to the blade edge vicinity portion 12) was 0.2 mm. The masking layer Mb is formed on the inner peripheral surface of the portion where the shaft hole 16 is formed because the inner peripheral surface of the portion where the shaft hole 16 is formed corrodes and the final diameter of the shaft hole 16 changes. This masking layer Mb can be omitted if the diameter of the portion where the shaft hole 16 is formed is reduced in advance.

  Then, after removing the masking layers M and Ma from the super-hard chip 14 and the base metal member 18b by immersion in caustic soda solution, the base metal member 18b is etched again, so that the base metal member 18b is used as shown in FIG. The etching process which forms the base | base metal base 11 and the blade edge | tip vicinity part 12 which were shown to (c) was performed. In this case, since the ultra-hard chip 14 has high corrosion resistance against the etching solution, the thickness does not change. Here, the entire base metal member 18b was thinned by 0.1 mm by etching, and then the masking layer Mb was removed by immersion in caustic soda solution.

  As a result, the vicinity of the etching boundary 20 became thinner than the blade thickness, and the rotary saw 10 was obtained. In the second etching process, not only the masking layer Mb but also the super hard tip 14 which is a part of the masking layer M and the boundary portion between the super hard tip 14 and the blade edge forming portion 13 are masked. May be. According to this, it is possible to prevent the etching solution from entering the boundary portion between the super hard tip 14 and the blade edge forming portion 13 and minutely corroding the joint portion.

  As described above, in the rotary saw 10 according to the present embodiment, first, the super hard tip 14a formed thicker is joined to the base metal member 18 formed thicker by brazing. After that, the super-hard chip 14a having a set thickness is formed by grinding the super-hard chip 14a together with the vicinity of the super-hard chip 14a in the base metal member 18, and the outer peripheral portion of the base metal member 18 is thinned. The base metal member 18a is formed. In this case, since the base member 18 has a sufficient thickness to withstand the processing by mechanical grinding, it does not deform during grinding. Further, since the grinding process is mechanical grinding, the cutting edge 15 can be formed sharply.

  After the cutting edge 15 is formed, the cutting edge 15 is set by removing the excess portion by etching after forming the base metal member 18a on the thin base metal member 18b by grinding without grinding. The base metal base portion 11 and the blade edge vicinity portion 12 having a different thickness are formed. Thus, by using the etching process, it is possible to process the base metal member 18b thinned to some extent without applying an excessive force. Therefore, the base metal base portion can be formed without deforming the base metal member 18b. 11 and the blade edge vicinity part 12 can be formed. For this reason, the extremely thin rotary saw 10 having a blade edge thickness of 0.3 mm and a blade edge vicinity portion 12 thickness of 0.2 mm can be manufactured with high accuracy.

  As another embodiment, when forming the ultra-hard chip 14 and the base metal member 18a shown in FIGS. 5A to 5C, grinding by electric discharge machining can be performed instead of mechanical grinding. . This electric discharge machining is a process for removing the surface layer of the super-hard chip 14a and the base metal member 18 by generating an electric discharge between the base metal member 18 to which the super-hard chip 14a is bonded and the processing electrode. Is the law. In this case, the base metal member 18 to which the ultra-hard chip 14a is bonded and the processing electrode are arranged to face each other in the processing liquid, and a voltage is applied using a high-frequency pulse power source. As a result, a spark is generated, and the surface layer of the super-hard chip 14a and the base metal member 18 is removed little by little. By repeating this, the super-hard chip 14 and the base metal member 18a are formed.

  As still another embodiment, the grinding process for forming the ultra-hard chip 14 and the base metal member 18a shown in FIGS. 5A to 5C is performed by the mechanical grinding described above, and FIGS. The removal processing until the ultra-hard chip 14 and the base metal member 18a shown in FIG. 8 are formed on the rotary saw 10 shown in FIGS. 8A to 8C can be performed by electric discharge machining. Also in this case, since the grinding can be performed without applying an excessive force to the base member 18a, the rotary saw 10 can be formed without damaging the base member 18a.

  As still another embodiment, the base metal 10a can be made of cemented carbide instead of the steel plate material. As this material, a cemented carbide of Co 10% or more can be used. Further, as the super hard tip constituting the cutting edge 15, it is preferable to use a polycrystalline diamond (PCD) or a cemented carbide alloy of about Co 3%. According to this, the thickness of the base metal base 11 and the blade edge vicinity part 12 can be reduced to about 0.1 mm. The cutting edge 15 is preferably processed by mechanical grinding or electric discharge grinding, and the removal processing of the cutting edge vicinity 12 is preferably performed by electric discharge grinding.

  Moreover, the rotary saw according to the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications. For example, in the embodiment described above, the thickness of the blade edge 15 is set to 0.3 mm, but the thickness of the blade edge 15 can be appropriately changed according to the use conditions of the rotary saw. However, a great effect is obtained when the thickness of the blade edge is 0.5 mm or less. In the embodiment described above, the thickness of the base metal base 11 is made thicker than the thickness of the blade edge 15, but the thickness of the base metal base 11 may be made thinner than the thickness of the blade edge 15. In addition, when the thickness of the base | base metal base 11 is the same as the blade edge | tip vicinity part 12, it will become a general carbide circular saw (tip saw).

  Further, in the above-described embodiment, grinding is performed with a rotating grindstone, but an end mill or a machining center may be used instead of the rotating grindstone for portions other than the super hard tip 14. Further, in the embodiment described above, at least the processing for thinning the blade edge vicinity portion 12 is performed by etching processing, electric discharge processing, or electrolytic processing, but instead of these, machining processing such as milling processing may be performed. Good. In this case, the back surface of the processing surface is the processing front surface, but a firm spacer is placed in the gap between the processing front surface and the machine reference surface. Even in this case, when the cutting edge 15 is ground, since the base 11 is thick, the cutting edge 15 is obtained with high rigidity, sharpness and high accuracy.

  In addition, since electric discharge machining and electrolytic machining require a longer time than other machining methods, a plurality of machining methods such as electric discharge machining and electrolytic machining are performed as appropriate after grinding to a certain extent in advance. Can be combined. Furthermore, in the above-described embodiment, a step is provided between the base metal base 11 and the blade edge vicinity portion 12, but this portion may be configured by a smooth continuous surface without a step. Further, the size of the blade edge vicinity portion 12 can be changed as appropriate. In short, it is only necessary to form a clam in which the thickness in the vicinity of the blade edge 15 is thinner than the blade thickness. Further, other configurations and manufacturing methods of the rotary saw according to the present invention can be appropriately changed within the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Rotary saw, 10a ... Base metal, 11 ... Base metal base, 12 ... Cutting edge vicinity part, 13, 13a ... Cutting edge formation part, 14, 14a ... Super-hard tip, 15 ... Cutting edge, 18, 18a, 18b ... Base metal Element.

Claims (4)

A base metal consisting of a disc-shaped base metal base and a cutting edge vicinity formed on the outer periphery of the base metal base ;
Wherein a plurality of cutting edges formed portion formed on an outer circumferential portion of the cutting edge near portion, a manufacturing method of a rotating saw having a plurality of cutting edges consisting of a plurality of superhard chips joined respectively to the cutting edge forming portion,
Said base metal to for forming the in base metal member more predetermined in portions forming the cutting edge forming portion thickness of superhard chips on After joining each said platform ultrahard tip of said predetermined thickness Grinding together with the outer peripheral side portion of the portion forming the blade edge vicinity portion in the gold member to form the plurality of blade edges having a thickness of 0.5 mm or less,
After forming a plurality of cutting edges, a portion thicker than the plurality of cutting edges in a portion forming the cutting edge vicinity of the base member is further processed and removed to form a clam thinner than the thickness of the plurality of cutting edges. A method of manufacturing a rotary saw. The method for manufacturing a rotary saw according to claim 1, wherein the grinding process for forming the plurality of cutting edges is mechanical grinding. In the portion of the base metal member that forms the vicinity of the blade edge, the removal processing that forms the claws by machining and removing portions thicker than the plurality of blade edges is not directly applied to the base metal member. The manufacturing method of the rotary saw of Claim 1 or 2 performed by the electrical or chemical processing method.   The manufacturing method of the rotary saw of Claim 3 which performs the said removal process by an etching process.

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