JP5124552B2 - Circular saw cutting machine - Google Patents

Description

  The present invention relates to a circular saw cutter for cutting a material to be cut by rotating the circular saw into a material to be cut while spraying a mist cutting fluid toward the circular saw.

  A disc-shaped circular saw having a plurality of blade portions that are connected in the circumferential direction at the outer peripheral portion of the base metal, a mist injection device that injects a mist-shaped cutting fluid toward the circular saw, and the circular saw is driven to rotate. 2. Description of the Related Art A circular saw cutting machine is known that includes a circular saw rotation driving device that moves, and a circular saw moving device that moves the circular saw toward a material to be cut in order to cut the circular saw into a metal material to be cut. For example, it is described in Patent Document 1. According to such a circular saw cutting machine, the amount of cutting fluid to be used is small, and furthermore, a large tank for storing the cutting fluid, a pump for circulating, a filtration device for filtering, etc. Is no longer necessary. Therefore, equipment cost and operation cost can be reduced.

JP 11-33823 A

  By the way, a well-known rake face is provided on the blade portion for the purpose of discharging chips (chips) separated from the material to be cut by cutting. When the chips are separated from the material to be cut, they are urged to be discharged by sliding into the predetermined shape while sliding against the rake face or breaking into predetermined small pieces. However, when cutting is continued with chips that have not been discharged attached to the blade, the chips are welded to or near the cutting edge of the blade so that the surface roughness of the cut surface of the workpiece is reduced. Cutting failure such as roughening may occur. This shortens the replacement cycle of the circular saw and shortens the service life. Also, especially when the material to be cut has a large diameter, etc., when the cutting fluid does not spread over the entire cut surface of the material to be cut, the lubricity between the blade and the material to be cut is reduced, and the gap between both members is reduced. There is a possibility that the frictional heat increases and wear between the blade portion and the cut surface of the material to be cut increases. Thereby, the lifetime of a circular saw becomes short and the processing accuracy of the cut surface of a to-be-cut material falls.

  Therefore, considering the improvement in the life of the circular saw and the improvement in the processing accuracy of the material to be cut, it is possible to clean (remove) chips adhering to the blade part without being discharged, and between the blade part and the material to be cut. It is very important to ensure lubricity. However, in the conventional circular saw cutter, the mist-like cutting fluid is not sufficiently supplied to the rake face of the blade portion, so that the cleaning effect of the chips adhering to the rake face and the blade portion and the material to be cut are There was a problem that it was difficult to obtain a sufficient lubricating effect.

  The present invention has been made against the background of the above circumstances, and its purpose is to sufficiently clean the chips adhering to the rake face of the blade portion and lubricate the blade portion and the material to be cut. It is an object of the present invention to provide a circular saw cutting machine that can sufficiently increase the life of a circular saw.

  The gist of the invention according to claim 1 for achieving the above object is as follows: (1) a disc-shaped circular saw having a plurality of blade portions connected in the circumferential direction at the outer peripheral portion of the base metal; Mist injection device for injecting the cutting fluid toward the circular saw, a circular saw rotation driving device for rotationally driving the circular saw, and the workpiece to be cut to cut the circular saw into a metal workpiece (2) the mist injection device is configured to move the mist-like cutting fluid forward of the circular saw in the rotation direction of the blade portion. It has the 1st nozzle which injects toward the rake face from the position facing a rake face.

  According to a second aspect of the present invention, in the first aspect of the invention, the first nozzle of the mist injection device injects the mist cutting fluid in a tangential direction of the rotation locus of the blade portion. Is to do.

  Further, the gist of the invention according to claim 3 is that, in the invention according to claim 1 or 2, the mist injection device is arranged in the mist shape toward the back surface of the blade portion immediately before cutting into the material to be cut. It has in having the 2nd nozzle which injects cutting fluid.

  According to the circular saw cutting machine of the first aspect of the present invention, the mist injection device scoops the mist-like cutting fluid from a position in front of the circular saw in the rotational direction and facing the rake face of the blade portion. Since it has the 1st nozzle which injects toward the surface, since the cleaning effect of the chip adhering to the rake face and the lubrication effect between the blade part and the material to be cut are sufficiently obtained, the life of the circular saw is sufficiently Can be increased. That is, mist-like cutting fluid is ejected from the position facing the rake face of the blade portion toward the rake face by the first nozzle in the rotational direction of the circular saw, whereby chips adhering to the rake face are removed. Since it is blown off and removed, the occurrence of cutting failure due to continued cutting while the chips adhere to the rake face is suppressed, and the life of the circular saw is increased. In addition, since the cutting portion is cut into the material to be cut while the cutting fluid is sufficiently supplied to the rake surface, the cutting fluid sufficiently flows on the cutting surface of the material to be cut. Lubricity is ensured and the life of the circular saw is increased.

  Moreover, according to the circular saw cutting machine of the invention concerning Claim 2, since the 1st nozzle of the said mist injection apparatus injects the said mist-like cutting fluid in the tangential direction of the rotation locus | trajectory of the said blade part. Since the cleaning effect of chips adhering to the rake face and the lubrication effect between the blade portion and the material to be cut can be sufficiently obtained, the life of the circular saw can be sufficiently increased.

  Moreover, according to the circular saw cutting machine of the invention concerning Claim 3, the said mist injection apparatus injects the said mist-like cutting fluid toward the back surface of the said blade part just before cutting into the said to-be-cut material. Therefore, the mist-like cutting fluid enters the cutting groove of the material to be cut and the lubrication effect between the blade part and the material to be cut is further obtained, thereby further improving the life of the circular saw. Can do.

It is a front view which shows the swing type circular saw cutting machine of one Example of this invention. It is a figure which expands and shows a part of circular saw shown in FIG. 1, and the front-end | tip part of a 1st nozzle and a 2nd nozzle. It is a perspective view which expands and shows one of the cemented carbide chips shown in FIG. It is a figure which shows a mode that the outer peripheral part of the to-be-cut material is cut by making the circular saw shown in FIG. 1 cut into a to-be-cut material from the side surface side of a cemented carbide tip. It is sectional drawing which shows the VV arrow part of the 1st nozzle shown in FIG. In the circular saw cutting machine equipped with the first nozzle and the second nozzle of the present embodiment and the conventional circular saw cutting machine equipped with the conventional nozzle, the number of materials to be cut until the circular saw reaches the end of its life is determined. It is a figure shown in comparison.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a front view showing a swing type circular saw cutter 10 according to an embodiment of the present invention. In FIG. 1, a circular saw cutting machine 10 cuts a workpiece 14 supplied from a material supply device (not shown) disposed on the back side of the circular saw cutting machine 10 shown in FIG. A material sizing feeder 16 that intermittently feeds in the longitudinal direction by a predetermined dimension set in advance, that is, moves in a direction parallel to the axis O 1 of the workpiece 14, and a lower end portion is supported by a support shaft 17. A circular circular saw 20 provided in a rotatable manner around the rotation center C2 and a mist-like cutting fluid are rounded at the upper end portion of a tilting member 19 provided in a rotatable manner around the rotation center C1 by the table 18. A mist injection device 22 that injects toward the saw 20, a circular saw rotation drive device 24 that rotationally drives the circular saw 20, and the circular saw 20 to cut the circular saw 20 into the metal workpiece 14. A circular saw moving device 26 for moving toward the workpiece 14; It is provided. The material to be cut 14 of the present embodiment has a round bar shape, and is arranged so as to form a longitudinal shape in a direction perpendicular to the paper surface in FIG. And the said to-be-cut material 14 is metal rods, such as an aluminum alloy, for example. Moreover, the said mist cutting fluid is what made vegetable oil mist-like, for example.

  The material sizing feeder 16 includes a work table 28 on which the workpiece 14 is placed, and a movable clamp device (not shown) that clamps the workpiece 14 and moves it by a predetermined dimension in a direction parallel to the axis O1. And a horizontal clamping device 30 and a vertical clamping device 32 for fixing the position of the workpiece 14 on the work table 28.

  For example, the movable clamping device holds the workpiece 14 in a direction parallel to the axis O1 in a state where the position of the workpiece 14 is not fixed by the horizontal clamping device 30 and the vertical clamping device 32, for example. A movable clamp that can be moved by a predetermined dimension by a hydraulic cylinder is provided.

  The horizontal clamp device 30 has a piston that can reciprocate in a direction perpendicular to the axis O1 of the workpiece 14 and parallel to the upper surface (work placement surface) of the work table 28, that is, in the direction of arrow a in FIG. And a clamp pad 36 connected to the piston rod of the hydraulic cylinder and fixed to the tip of the moving member 34 that is movable in the direction of arrow a. The horizontal clamp device 30 operates the hydraulic cylinder to advance the clamp pad 36 toward the workpiece 14, thereby fixing the workpiece 14 between the clamp pad 36 and the contact plate 38. . The abutting plate 38 is a plate material provided in a fixed position on the work table 28 on the opposite side of the workpiece 14 from the clamp pad 36. The horizontal clamp device 30 releases the fixation of the workpiece 14 when the workpiece 14 is moved by the movable clamp device.

  The vertical clamping device 32 is perpendicular to the axis O1 of the workpiece 14 on the opposite side of the workpiece 14 from the workpiece table 28 and perpendicular to the upper surface of the workpiece table 28 (non-cutting material placement surface). 1, a hydraulic cylinder 40 having a piston capable of reciprocating in the direction of arrow b in FIG. 1, and a clamp pad 42 fixed to the tip of the piston rod of the hydraulic cylinder 40. The vertical clamping device 32 operates the hydraulic cylinder 40 to advance the clamp pad 42 toward the workpiece 14, thereby fixing the workpiece 14 between the clamp pad 42 and the work table 28. To do. The vertical clamp device 32 releases the fixation of the workpiece 14 when the workpiece 14 is moved by the movable clamp device. The workpiece 14 is fixed by the vertical clamping device 32 preferably after the workpiece 14 is fixed by the horizontal clamping device 30.

  FIG. 2 is an enlarged view showing a part of the circular saw 20 shown in FIG. As shown in FIG. 2, the circular saw 20 is connected to the base metal 44 by a disc-like base metal 44 and at a constant interval in the circumferential direction on the outer periphery of the base metal 44, for example, by brazing or the like. And a plurality of cemented carbide tips 46. As shown in FIG. 1, the base metal 44 is integrally fixed to the rotating shaft 47, and supported by the tilting member 19 through the rotating shaft 47 so as to be rotatable around the rotation center C <b> 2. In FIG. 1, the cover member 48 of the circular saw 20 is partially cut away.

  The cemented carbide tip 46 is a tip using a cemented carbide alloy made of a sintered body mainly composed of tungsten carbide, for example, and corresponds to the blade portion of the present invention. FIG. 3 is an enlarged perspective view showing one of the cemented carbide tips 46 shown in FIG. As shown in FIG. 3, the cemented carbide tip 46 of the present embodiment is a negative type having a negative rake angle, and is formed on the cutting blade 49 and on the front side in the rotational direction of the circular saw 20 with respect to the cutting blade 49. Rake face 50. The cutting blade 49 is positioned on the upper surface of the carbide tip 46, that is, on the outer peripheral side of the circular saw 20, in order to shorten (decrease) the chips formed by cutting the workpiece 14 in the width direction of the carbide tip 46. The carbide chip 46 is divided into two in the width direction by grooves 52 provided in the circumferential direction on the surface. In addition, when the cemented carbide tip 46 is cut into the material 14 to be cut, a chamfer 54 is provided at the corner between the upper surface and the side surface in order to reduce the resistance between the cut surface of the material 14. Is provided.

  FIG. 4 is a view showing a state in which the outer peripheral portion of the material to be cut 14 is cut by cutting the rotationally driven circular saw 20 into the material to be cut 14 from the side surface side of the carbide tip 46. . As shown in FIG. 4, a part of the outer periphery of the workpiece 14 is pressed by the cutting action of the cutting edge 49 of the carbide tip 46 when the carbide tip 46 that is rotationally driven in the direction of arrow c is pressed. It is removed along the circumferential direction. The removed chips are discharged while sliding against the negative surface 58 between the cutting edge 49 and the rake face 50 and the rake face 50. The chips are deformed into a curved shape by a concave surface 60 formed on the outer peripheral portion of the rake face 50, and are ruptured into small pieces, so that discharge is promoted. Further, in the present embodiment, the cutting fluid is supplied to the surfaces of the cutting blade 49, the negative surface 58, and the rake face 50 (including the concave surface 60) by the mist injection device 22, so that the above-mentioned surfaces and the chips are easily slipped. As a result, chip discharge is further promoted.

  Returning to FIG. 1, the circular saw rotation driving device 24 includes a rotary shaft 47 that supports the circular saw 20 so as to be rotatable about the rotation center C <b> 2, and a circular saw driving motor as a power source that rotationally drives the circular saw 20. 62 and a transmission member (not shown) such as a pulley and a belt for transmitting the rotation of the output shaft of the electric motor for driving the circular saw to the rotary shaft 47. The circular saw driving motor 62 is fixed to the tilting member 19. The circular saw rotation driving device 24 drives the circular saw 20 in the direction of arrow c by operating the circular saw driving motor 62 and transmitting the rotation of the output shaft to the rotary shaft 47 through the transmission member. To do.

  The circular saw moving device 26 is a machine base 64 integrated with a work table 28 for fixing the workpiece 14 in order to move the circular saw 20 toward the workpiece 14 or to the opposite side of the workpiece 14. The first support member 66 fixed to the upper surface of the circular saw 20 and the second support member 68 fixed to the upper part of the tilting member 19 that supports the circular saw 20 are driven so as to approach and separate from each other. Specifically, the circular saw moving device 26 includes a hollow cylindrical support member 70 supported by a first support member 66 so as to be rotatable around a rotation center C3, and substantially concentric with the axis of the support member 70. And an electrically driven servo motor 72 fixed to the end of the support member 70 opposite to the second support member 68, and one end of the ball screw rotation output shaft. Is supported by the inner peripheral surface of the support member 70 so as to be movable in the axial direction and non-rotatable around the axial center, and the other end portion is supported by the second support member 68 on the rotation center C3. And a cylindrical axial movement member 74 supported so as to be rotatable about a parallel rotation center C4. The circular saw moving device 26 operates a servo motor 72 to move an axial moving member 74 connected to the upper portion of the tilting member 19 via a second support member 68 in the axial direction, that is, in the direction of arrow d in FIG. The tilting member 19 is tilted in the direction of arrow e in FIG.

  As shown in FIGS. 1 and 2, the mist injection device 22 includes, for example, a mist cutting fluid supply source (not shown) disposed on the back side of the tilting member 19 shown in FIG. 1, and the mist cutting fluid supply source. A first mist cutting fluid is sprayed in the direction of the arrow f in FIG. 2 from the position facing the rake face 50 of the cemented carbide tip 46 toward the rake face 50 in front of the circular saw 20 in the rotational direction. The nozzle 76 and the 2nd nozzle 78 which injects the said mist cutting fluid to the arrow g direction of FIG. 2 toward the back surface of the carbide | carbonized_material chip | tip 46 just before cutting into the to-be-cut material 14 are provided. The circumferential position of the circular saw 20 to which the mist-like cutting fluid is sprayed by the first nozzle 76 is different from the circumferential position of the circular saw 20 to which the mist-like cutting fluid is sprayed by the second nozzle. It is located about 1/4 turn in the direction on the rear side in the rotational direction.

  The mist cutting fluid supply source includes, for example, a cutting fluid tank that stores cutting fluid, a compressor that generates compressed air, a cutting fluid in the cutting fluid tank, and a compressed air from the compressor. A well-known so-called ejector for feeding to the first nozzle 76 and the second nozzle 78 is provided.

  FIG. 5 is a cross-sectional view showing the VV arrow portion of the first nozzle 76 shown in FIG. As shown in FIG. 5, the first nozzle 76 includes a mist cutting fluid supply pipe 80 and a cylindrical tip member 82 whose side surface is fixed to the tip of the mist cutting fluid supply pipe 80 by, for example, screwing. I have. The tip member 82 has a hollow cylindrical shape, and plugs (meckle plugs) 84 are attached to both ends, respectively, and a first injection hole 86 formed linearly toward the concave surface 60 of the cemented carbide tip 46. And a second injection hole 88 and a third injection hole 90 provided on both sides of the first injection hole 86. The first nozzle 76 has a mist-like cutting fluid at an intermediate position in the width direction of the cemented carbide tip 46 of the concave surface 60 from the first injection hole 86, the second injection hole 88, and the third injection hole 90. Injecting in the tangential direction of the rotation locus L of the center point P toward the center point P of the concave surface 60 of the rake face 50 of FIGS. The rotation locus L corresponds to the rotation locus of the blade portion in the present invention.

  In the circular saw cutting machine 10 configured as described above, first, the material 14 to be cut is supplied onto a work table 28 from a material supply device (not shown) by a material sizing device 16. Next, the workpiece 14 is clamped and fixed by the horizontal clamp device 30 and the vertical clamp device 32. Next, the circular saw 20 rotated by the circular saw rotation driving device 24 is moved toward the workpiece 14 by the circular saw moving device 26. Then, while the mist-like cutting fluid is ejected from the first nozzle 76 and the second nozzle 78 of the mist injection device 22 toward the circular saw 20, the circular saw 20 responds to a preset cutting speed (moving speed). And cut into the workpiece 14. Of the mist-like cutting fluid, the one injected from the first injection hole 86, the second injection hole 88, and the third injection hole 90 of the first nozzle 76 is removed from the material 14 by the cutting action of the cutting blade 49. The action of blowing off the chips adhering to the rake face 50 and the like by the injection pressure, and the supply of the chips 49, the negative surface 58 and the rake face 50 (including the concave face 60) to the above-mentioned surfaces and chips. It has the effect of improving sliding and promoting chip discharge. Further, among the mist cutting fluid, those injected from the first injection hole 86, the second injection hole 88, and the third injection hole 90 of the first nozzle 76, and those injected from the second nozzle 78, By being supplied to the cut surface of the circular saw 20 or the workpiece 14, there is an effect of improving the lubricity between the circular saw 20 and the workpiece 14.

  FIG. 6 shows the circular saw 20 with the first nozzle 76 and the second nozzle 78 of this embodiment and the conventional circular saw cutter with the conventional nozzle until the circular saw 20 reaches the end of its life. It is a figure which compares and shows the cutting number of the to-be-cut material 14 of. The conventional nozzle is a rotation direction of about 1/4 of the circumferential direction of the circular saw 20 from the circumferential position of the second nozzle 78 and the circular saw 20 to which the mist cutting fluid is sprayed by the second nozzle 78. This is a nozzle that is disposed at a circumferential position on the rear side and that ejects mist-like cutting fluid from the outer circumferential side of the circular saw 20 toward the rotation center C2. In FIG. 6, the horizontal axis is the number of the circular saw 20 used in the order of execution of the cutting experiment shown in FIG. 6, and the vertical axis is the number of cuts of the workpiece 14 until the circular saw 20 reaches the end of its life. . Numbers 1 to 14 of the circular saw 20 are cut by a conventional circular saw cutting machine, and numbers 15 to 40 of the circular saw 20 are cut by the circular saw cutting machine 10 of this embodiment. As shown in FIG. 6, the average number of cuts in the conventional circular saw cutter is around 6800, whereas the average number of cuts in the circular saw cutter 10 of this embodiment is around 9400. It is. In other words, in the circular saw cutting machine 10 of the present embodiment, the life of the circular saw 20 is increased as compared with the conventional circular saw cutting machine.

  As described above, according to the circular saw cutting machine 10 of the present embodiment, the mist injection device 22 rakes the mist cutting fluid forward of the circular saw 20 in the rotation direction and the rake face of the cemented carbide tip (blade portion) 46. Since it has the 1st nozzle 76 which injects toward the rake face 50 from the position which opposes 50, the cleaning effect of the chips adhering to the rake face 50, and the lubricating effect between the circular saw 20 and the material 14 to be cut Is sufficiently obtained, the life of the circular saw 20 can be sufficiently increased. In other words, the mist-like cutting fluid is ejected from the position facing the rake face 50 of the cemented carbide tip 46 toward the rake face 50 from the position in front of the circular saw 20 in the rotational direction by the first nozzle 76, thereby providing a rake face. Since the chips adhering to 50 are blown off and removed, the occurrence of cutting failure due to cutting being continued with the chips adhering to the rake face 50 is suppressed, and the life of the circular saw 20 is increased. In addition, since the circular saw 20 is cut into the workpiece 14 in a state where the cutting fluid is sufficiently supplied to the rake face 50, the cutting fluid sufficiently reaches the cut surface of the workpiece 14, so that the circular saw 20 Lubricity with the material to be cut 14 is ensured, and the life of the circular saw 20 is increased as shown in FIG.

  Further, according to the circular saw cutting machine 10 of the present embodiment, the first nozzle 76 injects the mist cutting fluid in the tangential direction of the rotation locus L of the cemented carbide tip 46, so that it is applied to the rake face 50. Since the effect of cleaning adhering chips and the lubricating effect between the circular saw 20 and the workpiece 14 can be sufficiently obtained, the life of the circular saw 20 can be sufficiently increased.

  Further, according to the circular saw cutting machine 10 of the present embodiment, the first nozzle 76 injects the mist cutting fluid toward the rake face 50 and both side faces of the cemented carbide tip 46. Since the entire hard tip 46 is sufficiently covered with an oil film and a lubricating effect between the circular saw 20 and the workpiece 14 is sufficiently obtained, the life of the circular saw 20 can be sufficiently increased.

  Further, according to the circular saw cutting machine 10 of the present embodiment, the mist injection device 22 has the second nozzle 78 that injects the mist cutting fluid toward the back surface of the cemented carbide tip 46 immediately before cutting into the workpiece 14. Therefore, the mist-like cutting fluid sufficiently enters the cutting groove of the material 14 to be cut, and the lubrication effect between the circular saw 20 and the material 14 to be cut is further obtained. It can be further enhanced.

  As mentioned above, although one Example of this invention was described in detail with reference to drawings, this invention is not limited to this Example, It can implement in another aspect.

  For example, in the above-described embodiment, the circular saw 20 is a carbide saw blade in which the carbide tip 46 is fixed to the outer peripheral portion of the base metal 44 by brazing, but is not limited thereto. A saw blade with a chip made of ceramic or the like fixed to the outer peripheral portion of the blade or a blade portion in which the cutting blade is formed integrally with the base metal 44 is provided on the outer peripheral portion. Other saw blades such as a saw blade that can be used again can be used.

  In the above-described embodiment, the circular saw cutting machine 10 is of a swing type, but is not limited thereto, and may be of a horizontal slide type or a vertical slide type, for example.

  In the above-described embodiments, the material to be cut 14 has a round bar shape, but is not limited thereto, and may have various cross-sectional shapes.

  In the above-described embodiments, the material to be cut 14 is an aluminum alloy, but is not limited thereto, and may be other metals such as general steel, alloy steel, or stainless steel.

  In the above-described embodiments, vegetable oil is used as the cutting fluid to be misted. However, the present invention is not limited thereto, and for example, animal oil, mineral oil, synthetic oil, or a mixed oil thereof is used. May be.

  In the above-described embodiment, the circular saw moving device 26 includes the ball screw mechanism having the ball screw shaft and the servo motor that rotationally drives the ball screw shaft. However, the present invention is not limited thereto, and for example, drives the rack and pinion. A rack and pinion mechanism having a servo motor may be provided.

  Further, in the above-described embodiment, the first nozzle 76 has a center point of the mist-like cutting fluid from the first injection hole 86, the second injection hole 88, and the third injection hole 90 toward the center point P of the concave surface 60. Although the injection is performed in the tangential direction of the rotation locus L of P, the present invention is not limited to this. As long as the mist cutting fluid is sprayed toward the rake face 50, the number and shape of the spray holes may be arbitrary.

  In the above-described embodiment, the circumferential position of the circular saw 20 to which the mist cutting fluid is sprayed by the first nozzle 76 is relative to the circumferential position of the circular saw 20 to which the mist cutting fluid is sprayed by the second nozzle. In the circumferential direction of the circular saw 20, it is located about ¼ turn on the rear side in the rotational direction. However, it is not limited to this and may be located anywhere in the circumferential direction. Preferably, in order to further improve the lubricity between the circular saw 20 and the material to be cut 14 by cutting into the material to be cut 14 while holding more cutting fluid on the rake face 50 of the carbide tip 46. The circumferential position of the circular saw 20 to which the mist-like cutting fluid is sprayed by the first nozzle is allowed on the rear side in the rotational direction with respect to the circumferential position of the circular saw 20 to which the mist-like cutting fluid is sprayed by the second nozzle. Set as close as possible. For example, it is set between a circumferential position on the rear side in the rotational direction about 1/8 turn and a circumferential position on the rear side in the rotational direction about 1/4 turn.

  It should be noted that the above description is merely an embodiment, and other examples are not illustrated. However, the present invention is implemented in variously modified and improved modes based on the knowledge of those skilled in the art without departing from the gist of the present invention. Can do.

10: Circular saw cutting machine 14: Material to be cut 20: Circular saw 22: Mist injection device 24: Circular saw rotary drive device 26: Circular saw moving device 44: Base metal 46: Carbide tip (blade part)
50: rake face 76: first nozzle 78: second nozzle L: rotation locus

Claims (3)

A disc-shaped circular saw having a plurality of blade portions that are connected in the circumferential direction at the outer peripheral portion of the base metal, a mist injection device that injects a mist-shaped cutting fluid toward the circular saw, and the circular saw is driven to rotate. A circular saw cutting machine comprising: a circular saw rotary drive device; and a circular saw moving device that moves the circular saw toward the workpiece to cut the circular saw into a metal workpiece,
The mist injection device includes a first nozzle that injects the mist-like cutting fluid from a position in front of the circular saw in a rotational direction and facing the rake face of the blade portion toward the rake face. Circular saw cutting machine.   2. The circular saw cutter according to claim 1, wherein the first nozzle of the mist spraying device sprays the mist-shaped cutting fluid in a tangential direction of a rotation locus of the blade portion.   3. The circular saw cutter according to claim 1, wherein the mist injection device has a second nozzle that injects the mist-like cutting fluid toward a back surface of the blade portion immediately before cutting into the workpiece. .

Images