JP6884396B2 - Cutting tools - Google Patents

Description

The present invention relates to a cutting tool provided with a cutting blade having a plate surface curved in an arch shape or an arc shape, and in particular, a cutting tool in which the cutting blade of the cutting blade is curved in an arch shape or an arc shape with respect to the plate surface of the cutting blade. Regarding.

Patent Document 1 describes a cylindrical blade formed by sandwiching and fixing a semicircular cutting edge body between a main body and a semicircular holding member in a state of being along a curved surface of the cylindrical main body. ing. Patent Document 2 describes an attachment structure of a long member formed by fixing a linear blade (long member) in a state of being pressed against a base metal.

In general, cemented carbide (hereinafter referred to as cemented carbide) is a material having higher hardness than high-speed tool steel (high-speed steel, hereinafter referred to as high-speed steel) and having less decrease in hardness at high temperatures. Therefore, when cemented carbide is used for cutting, it cuts well.

Japanese Unexamined Patent Publication No. 2004-314269 Japanese Unexamined Patent Publication No. 06-126698

There is a problem that it is difficult to set the cutting edge of the cutting edge to a predetermined curved shape curved in a bow shape or an arc shape with high accuracy.

In addition, cemented carbide has a smaller toughness (tenacity) than that of high-speed cemented carbide, and cannot maintain sufficient bending strength. Therefore, if an excessive force is applied, the cemented carbide may be broken, cracked, or chipped.

Therefore, the present invention solves the above-mentioned problems, and an object of the present invention is to provide a cutting tool capable of setting a cutting edge of a cutting blade into a predetermined curved shape curved in an arch shape or an arc shape with high accuracy. is there.

The cutting tool of the present invention for solving the above problems is a cutting tool having a plate-shaped cutting blade having a cutting blade at one end and a support to which the cutting blade can be detachably attached. The cutting blade is configured so that the plate surface and the cutting blade can be elastically deformed in a direction intersecting the plate surface, and the support is configured to be able to hold the plate surface of the cutting blade and is concave. It is provided with a support surface curved in a curved or convex curved shape, and when the cutting blade is attached to the support, the plate surface of the cutting blade and the cutting blade have a surface shape of the support surface or a shape close thereto. When the cutting blade is elastically deformed and curved in an arch shape or an arc shape in a direction intersecting the plate surface of the cutting blade, and the cutting blade is removed from the support, the cutting blade is attached to the support. It is characterized in that the plate surface of the cutting blade and the curvature of the cutting blade are gentle as compared with the above.

According to the present invention, it is a cutting tool having a plate-shaped cutting blade having a cutting blade at one end and a support to which the cutting blade can be detachably attached, and the cutting blade is attached to a plate surface. The plate surface and the cutting edge are elastically deformable in the direction of intersection, and the support is configured to be able to hold the plate surface of the cutting blade and is curved in a concave curved shape or a convex curved shape. When the cutting blade is attached to the support, the plate surface and the cutting blade of the cutting blade are elastically deformed to the surface shape of the support surface or a shape close to the surface shape of the support surface, and the cutting blade has a support surface. When the cutting blade is curved in an arch shape or an arc shape in a direction intersecting the plate surface and the cutting blade is removed from the support, the cutting blade is said to have the cutting blade as compared with a state in which the cutting blade is attached to the support. Since the plate surface and the cutting edge are gently curved, the plate surface of the cutting blade is elastically deformed into or close to the surface shape of the support surface to be curved, so that the support surface has a predetermined surface shape. By setting to, the plate surface of the cutting blade and the cutting blade can be set to a predetermined curved shape with high accuracy, and the cutting blade of the cutting blade can be re-polished from the support. By removing the cutting blade, the cutting blade can be easily performed as compared with the case where the cutting blade is attached to the support. Here, the support surface of the support may be curved in a concave curved surface shape or a convex curved surface shape over the entire surface, or a part of the support surface may be curved in a concave curved surface shape or a convex curved surface shape.

In the present invention, in a state where the plate surface of the cutting blade and the cutting blade are held in the surface shape of the support surface in the support or a shape close thereto, the plate surface of the cutting blade is supported by the support. It is preferable to further have a fixing structure for fixing to the surface. According to the present invention, in a state where the plate surface of the cutting blade and the cutting blade are held in the surface shape of the support surface in the support or a shape close to the surface shape of the support surface, the plate surface of the cutting blade is held on the support. By further having a fixing structure for fixing to the support surface, the plate surface of the cutting blade and the cutting blade can be held in the surface shape of the support surface in the support or a shape close thereto.

The cutting tool of the present invention includes a plate-shaped cutting blade having a cutting blade at one end, a support to which the cutting blade can be detachably attached, and a fixed structure for fixing the cutting blade and the support. A cutting tool having the cutting blade, the cutting blade is configured to be elastically deformable in a direction in which the plate surface and the cutting blade intersect the plate surface, and the support supports the plate surface of the cutting blade. It is provided with a support surface curved in a concave curved shape or a convex curved shape, which is configured to be mountable, and the fixed structure comprises the plate surface of the cutting blade and the cutting blade of the support surface of the support. It is characterized in that the plate surface of the cutting blade is fixed to the support surface of the support while being held in a surface shape or a shape close to the surface shape.

According to the present invention, it has a plate-shaped cutting blade having a cutting blade at one end, a support to which the cutting blade can be detachably attached, and a fixed structure for fixing the cutting blade and the support. A cutting tool, the cutting blade is configured to be elastically deformable in a direction in which the plate surface and the cutting blade intersect the plate surface, and the support mounts the plate surface of the cutting blade. It is provided with a support surface curved in a concave curved shape or a convex curved shape, which is configured to be able to be placed, and the fixed structure includes the plate surface of the cutting blade and the surface of the support surface on the support. By being configured to fix the plate surface of the cutting blade to the support surface of the support while holding the shape to or close to the shape, the plate surface of the cutting blade and the cutting blade can be fixed to each other. The deformation can be maintained by elastically deforming the surface shape of the support surface of the support or a shape close to the surface shape. Here, the support surface of the support may be curved in a concave curved surface shape or a convex curved surface shape over the entire surface, or a part of the support surface may be curved in a concave curved surface shape or a convex curved surface shape.

In the present invention, it is preferable that the fixed structure is configured to connect the plate surface of the cutting blade and the support surface of the support at a plurality of positions on the support surface. According to the present invention, the fixed structure is configured to connect the plate surface of the cutting blade and the support surface of the support at a plurality of positions on the support surface. The plate surface of the cutting blade can be held over the entire surface in the surface shape of the support surface or a shape close to the surface shape.

In the present invention, the fixed structure is formed by inserting a hole penetrating the plate surface of the cutting blade, a screw hole drilled in the support surface of the support, and the hole of the cutting blade to insert the support. It is preferable to have a fixture that can be screwed into the screw hole of the above. According to the present invention, the fixed structure is formed by inserting a hole penetrating the plate surface of the cutting blade, a screw hole drilled in the support surface of the support, and the hole of the cutting blade. By having a fixture that can be screwed into the screw hole of the support, the cutting blade and the support can be connected so that the plate surface of the cutting blade and the support surface of the support are in contact with each other. For example, the fixture is a bolt or screw.

In the present invention, it is preferable that the hole of the cutting blade is a long hole, and the opening of the hole extends in a direction intersecting the cutting blade of the cutting blade. According to the present invention, the hole of the cutting blade is a long hole, and the opening of the hole extends in a direction intersecting the cutting blade of the cutting blade, so that the cutting blade has a relation to the support. The hole can be slid in the extending direction, and the amount of protrusion of the cutting blade with respect to the support can be finely adjusted. In particular, even when the cutting blade of the cutting blade is worn, the cutting blade and the support can be fixed so that the cutting blade projects from the edge (front end) of the support.

In the present invention, it is preferable that the cutting blade is composed of a single blade. According to the present invention, since the cutting blade is composed of one blade, the seam of the blade is the cutting blade as in the case where a plurality of blades are connected in a row to form the cutting blade. Since it does not exist on the plate surface of, it is possible to cut a smooth cutting surface that is not damaged by streaks or scratches due to the seams.

Here, in the cutting blade, at least the cutting blade is made of cemented carbide, the plate thickness of the cutting blade is in the range of 0.5 to 4.0 mm, and the support surface of the support is larger than 300 mm. It is preferable that the radius of curvature is arcuate or arcuate. According to this, at least the cutting blade is made of cemented carbide, the plate thickness of the cutting blade is in the range of 0.5 to 4.0 mm, and the support surface of the support is 300 mm. Since the cutting blade is curved in a bow shape or an arc shape with a larger radius of curvature, the cutting blade of the cutting blade can be curved without breaking, breaking or breaking the cutting blade.

In the present invention, it is preferable that the support surface of the support has different radii of curvature at both ends and the intermediate portion of the cutting blade in the extending direction or the direction close to the extending direction of the cutting blade. According to the present invention, the support surface of the support has the support by having both end portions and the intermediate portion of the cutting blade in the extending direction or the direction close to the extending direction of the cutting blade having different radius of curvature. Of the supporting surfaces of the body, both end portions and intermediate portions of the cutting blade in the extending direction or the direction close to the extending direction of the cutting blade can be formed into different curved shapes.

In the present invention, it is preferable that both ends of the support surface of the support have a radius of curvature smaller than the radius of curvature of the intermediate portion. According to the present invention, both ends of the support surface in the support have a radius of curvature smaller than the radius of curvature of the intermediate portion, so that both ends of the support surface are tighter than the intermediate portion ( Formed into a (steep) curvature.

In the present invention, it is preferable that the intermediate portion of the support surface of the support is formed flat, and both ends thereof are curved in a bow shape or an arc shape. According to the present invention, the intermediate portion of the support surface of the support is formed flat, and both ends thereof are curved in a bow shape or an arc shape, so that the cutting blade of the cutting blade has a cutting edge. Both ends in the extending direction or the direction close to the extending direction can be curved along the support surface.

In the present invention, it is preferable that both ends of the support surface of the support are arranged at positions higher than the positions extended to both ends by the radius of curvature of the intermediate portion. According to the present invention, both ends of the support surface in the support are arranged at positions higher than the positions extended to both ends by the radius of curvature of the intermediate portion, so that both ends of the support surface are arranged. The portion can be released upward.

In the present invention, it is preferable that the cutting blade projects obliquely outward from the support. According to the present invention, in the cutting blade, the cutting blade projects obliquely outward from the support, so that the cutting blade of the cutting blade is used as a work material along the inclination direction of the cutting blade. It is possible to cut in sequence, and the machinability of the cutting blade can be improved.

In the present invention, it is preferable that one end of the cutting blade in the extending direction of the cutting blade projects outward from the support from the other end. According to the present invention, the cutting blade is one of the cutting blades because one end of the cutting blade in the extending direction projects outward from the support from the other end. The end of the blade can be cut into the work material before the other end.

In the present invention, it is preferable that the cutting edge of the cutting edge is curved in a bow shape or an arc shape so as to bulge outward. According to the present invention, the cutting edge of the cutting edge is curved in a bow shape or an arc shape so as to bulge outward, so that the intermediate portion of the cutting edge projects outward from both ends. Therefore, it is possible to cut into the work material first from the intermediate portion of the cutting edge.

In the present invention, it is preferable that the cutting edge of the cutting edge is curved in a bow shape or an arc shape so as to be recessed inward. According to the present invention, since the cutting edge of the cutting edge is curved in a bow shape or an arc shape so as to be recessed inward, both end portions of the cutting edge project outward from the intermediate portion. It is possible to cut into the work material first from both ends of the cutting edge.

In the present invention, an end that is positioned on the support surface of the support, abuts on the end of the cutting blade on the opposite side to the cutting blade, and is configured to be able to determine the posture of the cutting blade and to be positioned. It is preferable to further have a spacer having a portion. According to the present invention, the support is positioned on the support surface of the support and abuts on the end of the cutting blade opposite to the cutting blade so that the cutting blade can be posture-determined and positioned. By further having the spacer provided with the end portion, the cutting blade can be posture-determined and positioned only by bringing the end portion of the cutting blade into contact with the end portion of the spacer.

In the present invention, it is preferable that the spacer is configured to be slidable on the support surface of the support. According to the present invention, since the spacer is configured to be slidable on the support surface of the support, the position of the cutting blade can be finely adjusted by sliding the spacer.

The method for manufacturing a cutting tool of the present invention is a method for manufacturing a cutting tool in which the cutting edge of the cutting blade is curved in a direction intersecting the plate surface of the plate-shaped cutting blade, and the cutting blade is elastically deformable. The pressing step of pressing the plate surface against the concave or convex curved support surface of the support, and the modification of bending the plate surface of the cutting blade and the cutting blade along the support surface of the support. It is characterized by having a step and a fixing step of attaching the cutting blade to the support in a state where the plate surface of the cutting blade and the cutting blade are curved.

According to the present invention, there is a method for manufacturing a cutting tool in which the cutting edge of the cutting blade is curved in a direction intersecting the plate surface of the plate-shaped cutting blade, and the plate surface of the cutting blade that is elastically deformable. A pressing step of pressing the blade against the concave or convex curved support surface of the support, a deformation step of bending the plate surface of the cutting blade and the cutting blade along the support surface of the support, and the above-mentioned By having a fixing step of attaching the cutting blade to the support in a state where the plate surface of the cutting blade and the cutting blade are curved, the plate surface of the cutting blade and the cutting blade are attached to the support. Since the curved cutting blade is formed by bending along the support surface of the above, a highly accurate curved blade can be easily formed.

In the present invention, after the fixing step, the cutting blade is removed from the support, and the cutting blade supports the plate surface of the cutting blade and the curvature of the cutting blade by the restoring force of the cutting blade. It is preferable to further have a removal step that makes it smoother than when it is attached to the body. According to the present invention, after the fixing step, the cutting blade is removed from the support, and the restoring force of the cutting blade causes the cutting blade to bend the plate surface of the cutting blade and the cutting blade. By further having a removing step of making the cutting blade smoother than that attached to the support, the cutting blade becomes gentle in curvature of the plate surface of the cutting blade and the cutting blade. The cutting edge of the cutting edge can be easily re-polished by removing the cutting edge from the support.

In the present invention, it is preferable to further have a positioning step of determining the posture and positioning of the cutting blade on the support surface using a spacer before the pressing step. According to the present invention, by further having a positioning step of determining the posture and positioning of the cutting blade on the support surface using the spacer before the pressing step, as compared with the case where the spacer is not used, the said. The posture and position of the cutting blade can be easily set.

As described above, according to the present invention, the plate surface of the cutting blade and the cutting blade are elastically deformed and curved to the surface shape of the support surface in the support or a shape close to the surface shape of the support surface. By setting the plate surface and the cutting edge to a predetermined surface shape, it is possible to obtain an excellent effect that the plate surface and the cutting edge of the cutting blade can be set to a predetermined curved shape with high accuracy.

It is an exploded perspective view of the cutting tool of 1st Embodiment which concerns on this invention. It is a perspective view which looked at the cutting tool of 1st Embodiment from above. It is a front view of the cutting tool of 1st Embodiment. It is an enlarged view which shows the part surrounded by the alternate long and short dash line I of FIG. FIG. 3 is an enlarged cross-sectional perspective view showing a cutting tool cut along the line II-II of FIG. It is a perspective view which looked at the cutting tool of 1st Embodiment from below. It is a top view of the cutting blade in 1st Embodiment. FIG. 5 is an enlarged cross-sectional perspective view showing a cutting blade cut along the line III-III of FIG. 7. It is a front view of the support in 1st Embodiment. It is an enlarged cross-sectional perspective view which shows the support cut by the IV-IV line of FIG. It is a plan view (a), a left side view (b), a right side view (c), a bottom view (d), and a rear view (e) of the cutting tool of the first embodiment. The front view (a) of the cutting blade in the first embodiment, the enlarged view (b) of the portion surrounded by the alternate long and short dash line V in FIG. 12 (a), the left side view (c) and the right side view of the cutting blade ( d), an enlarged view (e) of FIG. 12 (c), an enlarged view (f) of FIG. 12 (d), a bottom view (g) and a rear view (h) of the cutting blade, and FIG. 12 (h). It is an enlarged view (i) of the part surrounded by the alternate long and short dash line VI. A plan view (a), a left side view (b), a right side view (c), a bottom view (d), and a rear view (e) of the support according to the first embodiment. It is a front view (a)-(b) which shows the modification of the support in 1st Embodiment. It is a perspective view of the cutting tool of 2nd Embodiment. It is a top view of the cutting blade in 2nd Embodiment. FIG. 5 is an enlarged cross-sectional perspective view showing a cutting blade cut along the line VII-VII of FIG. It is a plan view (a)-(f) which shows the modification of the cutting blade in 2nd Embodiment. It is a perspective view of the cutting tool of 3rd Embodiment. It is an enlarged plan view of the cutting tool of 3rd Embodiment. It is a front view which shows the modification of the support in 3rd Embodiment. It is an enlarged plan view (a)-(b) which shows the modification of the cutting tool of 3rd Embodiment. It is a perspective view (a) of the cutting tool of 4th Embodiment, and is a partially disassembled perspective view (b). It is a perspective view (a) of the cutting tool of the 5th embodiment and a partially disassembled perspective view (b). 6 is a perspective view (a) of the cutting tool of the sixth embodiment and is an exploded perspective view (b). It is a perspective view (a) which shows the modification of the cutting tool of 6th Embodiment, and is an exploded perspective view (b).

(First Embodiment)
Hereinafter, the cutting tool of the first embodiment according to the present invention will be described in detail. FIG. 1 is an exploded perspective view of the cutting tool of the first embodiment according to the present invention. FIG. 2 is a perspective view of the cutting tool of the first embodiment as viewed from above. As shown in FIGS. 1 and 2, the cutting tool 100 is a long member extending in one direction (horizontal direction indicated by arrows L and R), and has a cutting blade 110 and a support 120. In the first embodiment, the cutting blade 110 corresponds to the cutting blade, the support 120 corresponds to the support, and the upper surface 121U of the support 120 described later corresponds to the support surface.

In the drawing, the direction indicated by the arrow F is the front side (in FIG. 1, FIG. 2, FIG. 4, FIG. 5, FIG. 8, FIG. 10, FIG. 15, FIG. 17, and FIG. 19, the lower right side of the paper surface, FIG. 3, FIG. 9, FIG. 14 and FIG. 21 show the surface side of the paper surface, and FIG. 6 shows the upper right side of the paper surface). The direction indicated by the arrow B is the rear side (in FIG. 1, FIG. 2, FIG. 4, FIG. 5, FIG. 8, FIG. 10, FIG. 15, FIG. 17 and FIG. 19, the upper left side of the paper, FIGS. 3 and 9 and FIGS. In 14 and 21, it is the back side of the paper surface, and in FIG. 6, it is the lower left side of the paper surface.) The direction indicated by the arrow L is the left side (in FIGS. 1, 2, 4, 5, 8, 10, 15, 17, and 19, the lower left side of the paper, and in FIGS. 3, 9, 9, and 14). In FIG. 21, it is the left side of the paper, and in FIG. 6, it is the upper left side of the paper.) The direction indicated by the arrow R is on the right side (in FIG. 1, FIG. 2, FIG. 4, FIG. 5, FIG. 8, FIG. 10, FIG. 15, FIG. 17, and FIG. 19, the upper right side of the paper, FIGS. 3, 9, and 14 In FIG. 21, it is the right side of the paper surface, and in FIG. 6, it is the lower right side of the paper surface.) The direction indicated by the arrow U is on the upper side (FIGS. 1 to 10 and 14 and 15 and 17 and 19 and 21 are on the upper side of the paper. FIGS. 7 and 11 (a) and 13 (a). ), FIG. 16, FIG. 18, FIG. 20 and FIG. 22 show the surface side of the paper surface.) The direction indicated by the arrow D is the lower side (FIGS. 1 to 10 and 14 and 15 and 17 and 19 and 21 are the lower side of the paper. FIGS. 7 and 11 (a) and 13 In (a), FIG. 16, FIG. 18, FIG. 20 and FIG. 22, it is the back side of the paper surface.) The directions indicated by the arrows F and B are the front-back direction, the directions indicated by the arrows L and R are the left-right direction, and the directions indicated by the arrows U and D are the up-down direction. These directions indicate relative positional relationships, not absolute positional relationships with respect to the direction of gravity.

FIG. 7 is a plan view of the cutting blade according to the first embodiment. FIG. 8 is an enlarged cross-sectional perspective view showing a cutting blade cut along the line III-III of FIG. 7. 12A and 12B are a front view (a) of the cutting blade in the first embodiment, an enlarged view (b) of a portion surrounded by the alternate long and short dash line V in FIG. 12A, and a left side view (c) and a right side of the cutting blade. A top view (d), an enlarged view (e) of FIG. 12 (c), an enlarged view (f) of FIG. 12 (d), a bottom view (g) and a rear view (h) of the cutting blade, and FIG. (H) is an enlarged view (i) of the portion surrounded by the alternate long and short dash line VI. The opposite side of the cross section cut along the line III-III in FIG. 7 is the same as the cross section in FIG. 8, and is omitted. As shown in FIGS. 1, 7, 8 and 12, the cutting blade 110 is a long blade extending in one direction (horizontal direction indicated by arrows L and R), and is a long blade extending in one direction (horizontal direction indicated by arrows L and R) in the vertical direction indicated by arrows U and D. It is a thin plate with a thin thickness. The cutting blade 110 is composed of a single blade. That is, the cutting blade 110 is entirely composed of one blade, and the blades are connected in the middle of the longitudinal direction (horizontal direction) of the cutting blade 110, as if two or more blades are connected in one direction. There are no seams that are parts. Therefore, even if the work material is cut by the cutting blade 110, a clean cut surface can be obtained without scratches or streaks due to seams on the cut surface of the work material.

As shown in FIGS. 7, 8 and 12, a cutting blade 111 is formed at one end of the cutting blade 110 (the front end indicated by the arrow F). The cutting edge 111 is formed so as to be machinable, and is provided along the front end of the cutting edge 110. Specifically, the front surface 110F of the cutting blade 110 is inclined so as to recede from the upper surface 110U of the cutting blade 110 toward the rear side indicated by the arrow B toward the bottom surface 110D. The angle formed by the upper surface 110U and the front surface 110F of the cutting blade 110 is configured to be an acute angle. That is, the cutting blade 111 is a portion where the upper surface 110U and the front surface 110F of the cutting blade 110 intersect, and the cutting blade 111 of the cutting blade 110 is a sharp single-edged blade (see FIGS. 12 (e) and 12 (f)). Further, the cutting blade 111 of the cutting blade 110 extends along the longitudinal direction (left-right direction) of the cutting blade 110, and is formed over the entire length of the cutting blade 110 in the longitudinal direction. As a result, the cutting blade 110 can be cut at a time with a predetermined width in the longitudinal direction.

The plate surface of the cutting blade 110 is elastically deformable. The plate surface is either one or both of the upper surface 110U and the lower surface 110D of the cutting blade 110. When the plate surface of the cutting blade 110 is pressed in the vertical direction indicated by arrows U and D (the direction orthogonal to the longitudinal direction of the cutting blade 110), the plate surface is curved in the vertical direction in an arch shape or an arc shape. When the pressing is released, the curvature of the plate surface is gentle as compared with the pressed state. In other words, the plate surface of the cutting blade 110 has a larger radius of curvature than the pressed state by releasing the pressing of the cutting blade 110 against the plate surface in the vertical direction.

At this time, a cutting blade 111 is provided at the front end of the cutting blade 110, and the cutting blade 111 extends along the longitudinal direction (left-right direction) of the cutting blade 110. Therefore, the cutting blade 111 of the cutting blade 110 is configured to be elastically deformable in a bow shape or an arc shape in the vertical direction together with the plate surface of the cutting blade 110. Specifically, the cutting blade 111 of the cutting blade 110 is curved in a bow shape or an arc shape in the vertical direction when the plate surface of the cutting blade 110 is pressed in the vertical direction, and is pressed when the pressing is released. Compared to the state, the curvature is gentle (the radius of curvature is large). As a result, the cutting blade 110 can cut the work material in a state where the cutting blade 111 is curved in a bow shape or an arc shape in a direction intersecting the plate surface of the cutting blade 110.

The cutting blade 111 of the cutting blade 110 is made of cemented carbide. Cemented carbide is an abbreviation for cemented carbide, which is obtained by mixing tungsten carbide (WC, tungsten carbide) and cobalt (Co), which is a binder, and sintering it, and carbonizing it according to the purpose of use. Titanium (TiC) and tantalum carbide (TaC) are added.

Here, the inventor of the present application has found through experience that the plate thickness (thickness in the vertical direction) of the cutting blade 110 is preferably in the range of 0.5 mm to 4.0 mm. If it is within this plate thickness range, the plate surface of the cutting blade 110 is curved without breaking, breaking or chipping the carbide portion (cutting blade 111) of the cutting blade 110. be able to. On the other hand, if the plate thickness of the cutting blade 110 is thinner than 0.5 mm, the rigidity of the cutting blade 110 becomes too small, and the cutting blade 110 cannot cut. If the plate thickness of the cutting blade 110 is thicker than 4 mm, the rigidity of the cutting blade 110 becomes excessive, and it becomes difficult to bend the plate surface of the cutting blade 110. In the illustrated example, the plate thickness of the cutting blade 110 is 3.0 mm.

FIG. 9 is a front view of the support according to the first embodiment. FIG. 10 is an enlarged cross-sectional perspective view showing a support cut along the line IV-IV of FIG. The opposite side of the cross section cut along the IV-IV line of FIG. 9 is the same as the cross section of FIG. 10, and is omitted. As shown in FIGS. 1 and 10, the support 120 is a long member extending in one direction (horizontal direction indicated by arrows L and R) like the cutting blade 110, and includes the front portion 121 and the rear portion 122. have. The front portion 121 is the front portion indicated by the arrow F of the support 120, the rear portion 122 is the rear portion indicated by the arrow B of the support 120, and the front portion 121 and the rear portion 122 are integrally formed. There is. In other words, the front portion 121 and the rear portion 122 are arranged adjacent to each other in a direction orthogonal to the longitudinal direction (horizontal direction) of the support 120 (the lateral direction of the support 120, the front-rear direction indicated by arrows F and B). And are connected to each other.

The front portion 121 of the support 120 is formed thicker in the vertical direction than the rear portion 122. In other words, the plate thickness of the front portion 121 is larger than the plate thickness of the rear portion 122. Specifically, the front portion 121 is raised (protruded) upward from the rear portion 122 indicated by the arrow U, and the upper surface 121U of the front portion 121 is above the upper surface 122U of the rear portion 122 (high position in the vertical direction). ) Is placed. As a result, the possibility that the front portion 121 is deformed (distorted) due to the elasticity of the cutting blade 110 can be reduced as compared with the case where the front portion 121 has a thinner plate thickness (thickness in the vertical direction) than the rear portion 122. The holding of the cutting blade 110 by the portion 121 can be made more stable. Further, a step 120s is formed between the front portion 121 and the rear portion 122 on the upper portion of the support body 120. The step 120s separates the front portion 121 and the rear portion 122. Specifically, the step 120s is provided at an intermediate position in the front-rear direction indicated by arrows F and B of the support 120, extends in the longitudinal direction (horizontal direction) of the support 120, and is the longitudinal length of the support 120. It is formed over the entire length in the direction. On the other hand, FIG. 6 is a perspective view of the cutting tool of the first embodiment as viewed from below. As shown in FIG. 6, the bottom surface 120D of the support 120 is formed flat over the entire surface, and no step is provided between the front portion 121 and the rear portion 122. That is, when the support 120 is placed, the bottom surface 120D is configured to be in contact with the entire surface. As a result, the support 120 can hold the cutting blade 110 in a stable state without rattling.

FIG. 4 is an enlarged view showing a portion surrounded by the alternate long and short dash line I in FIG. As shown in FIGS. 2 and 4, the front portion 121 is configured so that the cutting blade 110 can be placed on it. Specifically, in the upper part of the front portion 121, the length of the support 120 in the longitudinal direction (horizontal direction) is the same as or close to the length of the cutting blade 110 in the longitudinal direction (horizontal direction). The width length of the support 120 in the lateral direction (front-rear direction) is longer than the width length of the cutting blade 110 in the lateral direction (front-rear direction). That is, the upper portion of the front portion 121 has a width in the longitudinal direction (horizontal direction) equal to or close to the width of the cutting blade 110, and a vertical width in the lateral direction (front-back direction) is the vertical width of the cutting blade 110. It is formed wider. That is, the upper portion of the front portion 121 is configured so that the cutting blade 110 can be placed so that the cutting blade 110 fits within the region. Here, the length close to the length of the cutting blade 110 in the longitudinal direction (left-right direction) includes both a length slightly shorter than the length of the cutting blade 110 in the longitudinal direction (left-right direction) and a length slightly longer. In the illustrated example, the longitudinal length of the support 120 at the upper part of the front portion 121 and the longitudinal length of the cutting blade 110 are the same. Specifically, the length of the upper portion of the front portion 121 in the left-right direction is 455 mm, and the width length in the front-rear direction is 72.8 mm. The length of the cutting blade 110 in the left-right direction is 455 mm, and the width length in the front-rear direction is 50 mm.

FIG. 9 is a front view of the support according to the first embodiment. That is, FIG. 9 is a view of the front portion of the support according to the first embodiment as viewed from the front side. As shown in FIG. 9, the upper portion of the front portion 121 is curved in a downwardly concave (concave) bow shape or arc shape. In other words, the upper surface 121U of the front portion 121 is a concave curved surface, is curved in a concave shape over the entire length in the longitudinal direction (left-right direction) of the support 120, and the curved shape of the upper surface 121U is bow-shaped or arc-shaped. .. Therefore, the front portion 121 is formed so that the plate thickness (thickness in the vertical direction) of the central portion in the longitudinal direction (horizontal direction) of the support 120 is thinner than the plate thickness of both ends, and the plate thickness (thickness in the vertical direction) of the support 120 is formed. The plate thickness (thickness in the vertical direction) at both ends in the left-right direction is formed to be wider than the plate thickness in the central portion.

The radius of curvature of the upper surface 121U in the front portion 121 is preferably larger than 300 mm. This is because when the radius of curvature of the upper surface 121U is 300 mm or less and the cutting blade 110 is curved along the upper surface 121U, the carbide portion (cutting blade 111) of the cutting blade 110 is broken, damaged or chipped. In order to bend the plate surface of the cutting blade 110 to a predetermined radius of curvature, it is preferable that the radius of curvature of the upper surface 121U in the front portion 121 is set to be slightly larger than the desired radius of curvature. When the plate surface (bottom surface 110D) of the cutting blade 110 is in close contact with the upper surface 121U of the front portion 121 and curved, the radius of curvature of the plate surface of the cutting blade 110 is smaller than the radius of curvature of the upper surface 121U by the plate thickness of the cutting blade 110. Because it becomes. In the case of the illustrated example, the radius of curvature of the plate surface of the cutting blade 110 is set to 1500 mm, and the radius of curvature of the upper surface 121U is set to be slightly larger than 1500 mm.

Returning to FIGS. 1 and 10, the front end surface (front surface) indicated by the arrow F of the front portion 121 is the front surface 120F of the support body 120. The front surface 120F has a convex curved surface and is curved into an inverted truncated cone shape or a shape close to an inverted truncated cone shape. Specifically, the front surface 120F is curved in a convex shape that gradually recedes to the rear side indicated by the arrow B from the center to both ends in the left-right direction (longitudinal direction of the support 120) when viewed from above (FIG. 13 (FIG. 13). (See d)), it is inclined so as to gradually recede backward from the upper end (upper surface 121U) to the lower end (bottom surface 120D) when viewed from the side (left-right direction) (FIGS. 13 (b) and 13 (c). )reference). When the cutting blade 110 is placed on the upper surface 121U of the support 120, the front surface 120F of the support 120 is arranged below the cutting blade 111 of the cutting blade 110. As a result, the front surface 120F of the support 120 can discharge the chips generated by the cutting of the cutting blade 110 downward while moving the chips generated by the cutting of the cutting blade 110 from the inside to the left and right sides of the front surface 120F without staying on the front surface 120F. That is, the front surface 120F of the support 120 improves the chip evacuation property of the cutting tool 100.

13A and 13B are a plan view (a), a left side view (b), a right side view (c), a bottom view (d), and a rear view (e) of the support according to the first embodiment. As shown in FIGS. 1, 10 and 13, a stepped hole 122h is formed in the rear portion 122 of the support 120. The stepped holes 122h are for attaching the cutting tool 100 to another device, and are formed in large numbers at predetermined intervals in the longitudinal direction (left-right direction) of the support 120. These stepped holes 122h penetrate in the vertical direction from the upper surface 122U of the rear portion 122 to the bottom surface 120D of the support 120. The opening on the upper side (side of the upper surface 122U) of the stepped hole 122h is formed wider than the opening on the lower side (side of the bottom surface 120D), and a stepped portion is formed inside the stepped hole 122h. The opening on the upper side (the side of the upper surface 122U) of the stepped hole 122h is configured to accommodate the head of a fixture such as a screw or a bolt. Therefore, the head of the fixture such as a screw or a bolt can be accommodated inside the stepped hole 122h so that the head of the fixture does not protrude upward from the upper surface 122U of the rear portion 122. In the illustrated example, five stepped holes 122h of the support 120 are provided.

Here, FIG. 14 is a front view (a) to (b) showing a modified example of the support according to the first embodiment. As shown in FIGS. 14 (a) and 14 (b), the cutting tool 100 of the first embodiment may use the support 120'or the support 120 ″ instead of the support 120. The same portion as the support 120 in the first embodiment will be omitted. The upper surface 121U of the support 120 is concavely curved with a constant radius of curvature over the entire length of the support 120 in the longitudinal direction (left-right direction). However, the upper surfaces 121U'and 121U "of the supports 120' and 120" are both end portions (left end portions l1, l2 and right end portions r1) of the supports 120'and 120 "in the longitudinal direction (left-right direction), respectively. , R2) and the radius of curvature of the intermediate portions m1 and m2 are different from each other. Both end portions (left end portions l1, l2, right end portions r1, r2) have a radius of curvature smaller than the radius of curvature of the intermediate portions m1 and m2. In other words, both ends of the upper surfaces 121U ′ and 121U ″ are arranged at positions (upper side) higher than the positions extended to both ends at the radius of curvature of the intermediate portions m1 and m2. That is, the upper surfaces 121U ′ and 121U ″. Both ends of the upper surface 121U are jumped upward with respect to both ends of the upper surface 121U, and escape to the upper side.

As a result, the cutting blade 110 is attached to the upper surfaces 121U', 121U "of the supports 120', 120", and the plate surface of the cutting blade 110 and the cutting blade 111 are curved along the upper surfaces 121U', 121U "in this state. Then, the supports 120', 120 "in the left-right direction indicated by the arrows L and R along the radius of curvature of the cutting blade 110 corresponding to the intermediate portions m1 and m2 of the upper surfaces 121U'and 121U" on the supports 120'and 120 ". When the work material is cut while moving, both ends of the cutting blade 111 of the cutting blade 110 escape to the upper side indicated by the arrow U, so that both ends of the cutting blade 111 of the cutting blade 110 reach the cutting surface of the work material. The curvature of the intermediate portion of the cutting blade 111 in the cutting blade 110, which is wider than the length in the extending direction of the cutting blade 111 in the cutting blade 110 (longitudinal direction (left-right direction) of the cutting blade 110) without causing streaks or scratches. A clean cutting surface with a radius can be obtained. In particular, in the upper surface 121U "of the support 120" shown in FIG. 14B, the intermediate portion m2 is a horizontal flat surface, and both end portions (left end portion l2 and right end portion r2) are curved in a bow shape or an arc shape. ing. Therefore, the cutting blade 110 is attached to the upper surface 121U "of the support 120", the plate surface of the cutting blade 110 and the cutting blade 111 are curved along the upper surface 121U ", and in this state, the support 120" is bent in the longitudinal direction. When the work material is cut with the cutting blade 111 of the cutting blade 110 while moving in the (left-right direction), a clean horizontal plane wider than the length of the cutting blade 111 in the cutting blade 110 in the extending direction (longitudinal direction of the cutting blade 110) is obtained. Can be cut. In these modifications, the support 120'and the support 120 ″ correspond to the support, the upper surfaces 121U ′ and 121U ″ correspond to the support surface, and the cutting blade 110 corresponds to the cutting blade.

FIG. 3 is a front view of the cutting tool of the first embodiment. As shown in FIGS. 1, 2 and 3, the cutting tool 100 of the present embodiment is manufactured by connecting the cutting blade 110 and the support 120 in the vertical direction. Specifically, first, the cutting blade 110 and the support 120 are stacked on the front portion 121 of the support 120 in a state where the cutting blades 110 and the support 120 are aligned with each other in the longitudinal directions (superimposition step). Next, the plate surfaces (upper surface 110U and lower surface 110D) of the cutting blade 110 are pressed against the support 120 (pressing step). Finally, in this state, the cutting blade 110 is fixed to the support 120 by the fixture 130 (fixing step). From this, the cutting blade 110 and the support 120 are connected to manufacture the cutting tool 100.

In the pressing step, the plate surfaces (upper surface 110 and bottom surface 110D) of the cutting blade 110 and the cutting blade 111 are elastically deformed in the direction intersecting the plate surface of the cutting blade 110, and the surface shape of the upper surface 121U of the support 120 or the surface shape thereof. It curves to a similar shape (deformation process). That is, the cutting blade 110 is curved in a bow shape or an arc shape in which the plate surface and the cutting blade 111 are recessed downward (concave shape). At this time, the intermediate portion of the cutting blade 110 in the longitudinal direction (left-right direction) is located lower than both ends, and both ends of the cutting blade 110 in the longitudinal direction (left-right direction) are located above the intermediate portion. To do. In other words, the intermediate portion of the cutting blade 111 of the cutting blade 110 is located below the both ends, and both ends of the cutting blade 111 of the cutting blade 110 are located above the intermediate portion. Here, the support 120 has a mass and rigidity capable of holding the elastic deformation of the cutting blade 110. As a result, in the connected state of the cutting blade 110 and the support 120, the cutting blade 110 returns to the shape before the connection due to the elasticity (restoring force) of the cutting blade 110. The support 120 can maintain the curved shape of the cutting blade 110 without being deformed at the same time.

Here, FIG. 5 is an enlarged cross-sectional perspective view showing a cutting tool cut along the line II-II of FIG. The opposite side of the cross section cut along the line II-II in FIG. 3 is the same as the cross section in FIG. 5, and is omitted. As shown in FIGS. 1 and 5, the fixture 130 is a screw or bolt. As shown in FIGS. 1, 7, and 8, the cutting blade 110 is formed with a large number of holes 110h at predetermined intervals in the longitudinal direction (left-right direction). The large number of holes 110h are round holes (circular holes), and penetrate in the vertical direction from the upper surface 110U to the bottom surface 110D of the cutting blade 110. Threads that mesh with the threads of the fixture 130 may or may not be formed on the inner peripheral portions of the large number of holes 110h. Similarly, as shown in FIGS. 1 and 10, a large number of screw holes 121h are formed in the support 120 at predetermined intervals in the longitudinal direction (left-right direction) thereof. The large number of screw holes 121h are round holes (circular), extending in the vertical direction from the upper surface 121U of the front portion 121 toward the bottom surface 120D, and the inner peripheral portion has threads that mesh with the threads of the fixture 130. It is formed. The large number of screw holes 121h may or may not penetrate from the upper surface 121U to the bottom surface 120D of the support 120. The large number of holes 110h of the cutting blade 110 and the large number of screw holes 121h of the support 120 are formed at positions corresponding to each other. As a result, as shown in FIGS. 2 and 5, a large number of fixtures 130 are inserted through a large number of holes 110h of the cutting blade 110 in a state where the cutting blade 110 is superposed on the support 120, and the support 120 By screwing into a large number of screw holes 121h, the plate surface of the cutting blade 110 can be elastically deformed into the surface shape of the upper surface 121U of the support body 120 or a shape close to the surface shape, and the cutting blade 110 and the support body 120 can be fixed.

As shown in FIGS. 7 and 8, the large number of holes 110h of the cutting blade 110 are countersunk holes. In other words, the opening edges of the large number of holes 110h on the upper surface 110U side of the cutting blade 110 are chamfered in a conical shape. As a result, all or part of the head of the fixture 130 can be accommodated in the hole 110h of the cutting blade 110, and the head of the fixture 130 can be accommodated as compared with the case where the hole 110h of the cutting blade 110 is not a countersunk hole. The amount of the portion protruding upward from the upper surface 110U of the cutting blade 110 can be reduced. In the illustrated example, there are 22 fixtures 130, and the holes 110h of the cutting blade 110 and the screw holes 120h of the support 120 are each in two rows in the front-rear direction and 11 in the longitudinal direction (horizontal direction) of the cutting blade 110. A total of 22 pieces are formed.

Further, FIG. 11 is a plan view (a), a left side view (b), a right side view (c), a bottom view (d), and a rear view (e) of the cutting tool of the first embodiment. As shown in FIGS. 5 and 11, the cutting blade 110 is superposed on the support 120 in a state of being slightly shifted to the front side indicated by the arrow F with respect to the support 120. Therefore, the cutting blade 111 of the cutting blade 110 slightly projects from the front end position of the support 120 to the front side. At this time, the plate surface of the cutting blade 110 and the cutting blade 111 are curved in a downwardly concave (concave) bow shape or arc shape. As a result, the cutting tool 100 can cut the work material in a downwardly recessed (concave) bow shape or arc shape.

As shown in FIGS. 6, 11 (b), 11 (c), and 11 (d), the front surface 110F of the cutting blade 110 and the front surface of the support 120 are in the connected state of the cutting blade 110 and the support 120. Both 120F face the front side indicated by the arrow F of the cutting tool 100 (facing), and both retreat to the rear side indicated by the arrow B from the upper end to the lower end when viewed from the side (left-right direction). It is inclined like. At this time, the cutting blade 110 and the support 120 are stacked in the vertical direction, and the cutting blade 111 of the cutting blade 110 slightly projects from the front end position of the support 120 to the front side. Therefore, the front surface 110F of the cutting blade 110 and the front surface 120F of the support 120 have continuous or substantially continuous inclinations with each other. As a result, when the work material is cut by the cutting blade 111 of the cutting blade 110, chips can be discharged downward from the front surface 110F of the cutting blade 110 over the front surface 120F of the support 120. In the illustrated example, the inclination angle of the front surface 110F of the cutting blade 110 when viewed from the side (horizontal direction) (the angle formed by the upper surface 110U and the front surface 110F of the cutting blade 110) is 23 °, and the front surface 110F is viewed from the side (left and right direction). The inclination angle of the front surface 120F of the support body 120 (the angle formed by the bottom surface 120D of the support body 120 and the front surface 120F) is 45 °.

Returning to FIG. 2, in the cutting tool 100 configured as described above, a screw or bolt (not shown) is screwed into the stepped hole 122h of the support 120 to be attached to a device (not shown), and then the cutting tool 100 is indicated by an arrow. By moving it to the front side indicated by F, it is used as if the work material is cut by the cutting blade 110 of the cutting tool 100. At this time, a plurality of cutting tools 100 may be connected in the longitudinal direction (horizontal direction) or in a direction close to the longitudinal direction (left-right direction) so that the cutting blade 111 of the cutting blade 110 is continuously curved. As a result, the plurality of cutting blades 110 can be connected in a desired arc shape such as a crescent shape, a semicircle, or a circle, and the work material can be cut once in a desired arc shape.

In the first embodiment, the support 120 has a mass or rigidity capable of holding the elastic deformation of the cutting blade 110, and its upper surface 121U is curved in a downwardly concave (concave) bow or arc shape. doing. On the other hand, the cutting blade 110 is configured so that the plate surface can be elastically deformed in the vertical direction. Then, since the cutting blade 110 and the support 120 are connected in a state where the plate surfaces (upper surface 110U and lower surface 110D) of the cutting blade 110 are elastically deformed to the surface shape of the upper surface 121U or a shape close to the surface shape of the upper surface 121U of the support 120. The plate surface of the cutting blade 110 and the cutting blade 111 can be curved (according to) along the upper surface 121U of the support 120, and the curved shape of the cutting blade 110 can be maintained by the support 120.

In this first embodiment, when the cutting blade 110 is removed from the support 120, the plate surface of the cutting blade 110 and the curved shape of the cutting blade 111 are formed with the support 120 due to the elasticity (restoring force) of the cutting blade 110. By removing the cutting blade 110 from the support 120, since the cutting blade 110 becomes gentler than the connected state, that is, the radius of curvature of the plate surface of the cutting blade 110 and the cutting blade 111 becomes larger than that in the connected state. , The cutting edge 111 of the cutting blade 110 can be easily re-polished.

Further, the cutting blade 111 of the cutting blade 110 is made of cemented carbide, the plate thickness of the cutting blade 110 is in the range of 0.5 mm to 4.0 mm, and the radius of curvature of the upper surface 121U of the support 120 is larger than 300 mm. Therefore, the plate surface of the cutting blade 110 and the cutting blade 111 are curved in an arch shape or an arc shape along the upper surface 121U of the support 120 without breaking, damaging, or damaging the cutting blade 111 of the cutting blade 110. be able to.

(Second Embodiment)
FIG. 15 is a perspective view of the cutting tool of the second embodiment. FIG. 16 is a plan view of the cutting blade in the second embodiment. FIG. 17 is an enlarged cross-sectional perspective view showing a cutting blade cut along the line VII-VII of FIG. The opposite side of the cross section cut along the line VII-VII of FIG. 16 is the same as the cross section of FIG. 17, and the description thereof will be omitted. The same parts as those of the cutting tool 100 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 15, the cutting tool 200 of the second embodiment has a support 120, a cutting blade 210, and a spacer Sp2. Of these, the support 120 is the same as the support 120 of the first embodiment. In the second embodiment, the cutting blade 210 corresponds to the cutting blade, the support 120 corresponds to the support, and the upper surface 121U of the support 120 corresponds to the support surface (see FIGS. 1 and 2).

As shown in FIGS. 16 and 17, in the cutting blade 210 of the second embodiment, a large number of holes 210h penetrate from the upper surface 110U to the bottom surface 110D of the cutting blade 210, similarly to the cutting blade 110 of the first embodiment. The cutting blade 111 extends in the longitudinal direction of the cutting blade 210 (the left-right direction indicated by arrows L and R). The rear edge of the cutting blade 210 (the edge opposite to the cutting blade 111) also extends in the longitudinal direction (left-right direction) of the cutting blade 210. The large number of holes 110h of the cutting blade 110 in the first embodiment are round holes, while the large number of holes 210h of the cutting blade 210 in the second embodiment are elongated holes (elliptical holes). The openings of the large number of holes 210h extend in a direction orthogonal to the longitudinal direction (horizontal direction) of the cutting blade 210 (the lateral direction of the cutting blade 210, the front-rear direction indicated by arrows F and B). In other words, the openings of the large number of holes 210h extend in a direction orthogonal to or intersecting the extending direction of the cutting blade 111 in the cutting blade 210. As a result, the mounting position of the cutting blade 210 can be slightly moved with respect to the support 120 in the front-rear direction indicated by arrows F and B, and the amount of protrusion of the cutting blade 111 of the cutting blade 210 protruding from the support 120 can be increased. Can be adjusted. In particular, even when the length (width length) in the direction orthogonal to the longitudinal direction (front-back direction) of the cutting blade 210 is shortened due to the re-polishing of the cutting blade 111 of the cutting blade 210, the cutting blade of the cutting blade 210 The 111 can be projected outward from the support 120. Similar to the cutting blade 110 of the first embodiment, the large number of holes 210h of the cutting blade 210 are countersunk holes. In other words, the opening edges of the large number of holes 210h on the upper surface 110U side of the cutting blade 210 are chamfered in a conical shape. In the illustrated example, a total of 22 cutting blades 210 are formed in two rows in the lateral direction (front-back direction) of the cutting blades 210 in the longitudinal direction (left-right direction) of the cutting blades 210.

Returning to FIG. 15, the spacer Sp2 is for positioning the cutting blade 210, and is a plate-shaped long member extending in one direction (left-right direction) like the support 120 and the cutting blade 210. It has rigidity that can press the cutting blade 210. The spacer Sp2 has a rectangular shape when viewed from a plane, and the front edge indicated by the arrow F and the rear edge indicated by the arrow B extend in the longitudinal direction (left-right direction), and the plate surface (upper surface and bottom surface). ) Is configured to be deformable in the vertical direction in the shape of an arrow or an arc. The deformation of the spacer Sp2 may be elastic deformation or plastic deformation. The spacer Sp2 is used by positioning it on the upper surface 121U of the front portion 121 of the support 120.

Specifically, the spacer Sp2 has the support 120 so that the rear edge of the spacer 120 follows the rear edge of the support 120 indicated by the arrow B of the front portion 121, that is, the step 120s of the support 120. It is placed and positioned on the upper surface 121U of the. At this time, the spacer Sp2 and the support 120 may be fixed or may be temporarily fixed so as to be separable. In this state, the spacer Sp2 is located on the rear side (the side of the rear portion 122) of the front portion 121 on the upper surface 121U and extends in the longitudinal direction of the support 120 (the left-right direction indicated by arrows L and R). There is. The plate surface of the spacer Sp2 is curved to the surface shape of the upper surface 121U of the support 120 or a shape close to it. In other words, the plate surface of the spacer Sp2 and the front and rear edge edges are curved in a bow or arc shape in the vertical direction indicated by arrows U and D.

Here, FIG. 18 is a plan view (a) to (f) showing a modified example of the cutting blade in the second embodiment. In the cutting tool 200 of the second embodiment, the cutting blades 21 to 26 shown in FIGS. 18A to 18F may be used instead of the cutting blade 210. Each of these cutting blades 21 to 26 has a large number of holes 210h. The large number of holes 210h are the same as the large number of holes 210h of the cutting blade 210, and the description thereof will be omitted. In this modification, the support 120 corresponds to the support, and each of the cutting blades 21 to 26 corresponds to the cutting blade. In this modification, the cutting blades 21 and 22 are provided so that the cutting blades 21a and 22a are inclined with respect to the longitudinal direction (left-right direction) of the cutting blades 21 and 22. That is, the cutting blade 21a of the cutting blade 21 is inclined so that one end side (left side) in the longitudinal direction (left-right direction) projects forward from the other end side (right side) (FIG. 18A). On the other hand, the cutting blade 22s of the cutting blade 22 is inclined so that the other end side (right side) in the longitudinal direction (left-right direction) projects forward from the one end side (left side) (FIG. 18 (b)). .. As a result, when the work material is cut by these cutting blades 21 and 22, the cutting blades 21a and 22a gradually move to the work material from one end of the cutting blades 21 and 22 in the longitudinal direction to the other end. Since the cutting blades 21 and 22, the cutting blades 21 and 22 can improve the machinability as compared with the cutting blade 210 provided with the cutting blade 111 extending in the longitudinal direction of the cutting blade 210. For example, the inclination angle of the cutting blades 21a and 22a of the cutting blades 21 and 22, that is, the angle formed by the longitudinal direction (horizontal direction) of the cutting blades 21 and 22 and the extending direction of the cutting blades 21a and 22a is 5 to 10 °. is there.

Further, in the cutting blade 23, the cutting blade 23a has a triangular shape (wedge shape), and in the cutting blade 23a, the intermediate portion in the longitudinal direction (left-right direction) of the cutting blade 23 projects to the front side as compared with both end portions. The left and right sides of the intermediate portion are inclined so as to gradually recede from the to both ends (FIG. 18 (c)). The cutting blade 24 has a zigzag-shaped cutting blade 24a, and the cutting blade 24a is configured such that a plurality of triangular shapes (wedge-shaped) are connected in the longitudinal direction (left-right direction) of the cutting blade 24 (FIG. 18 (d)). ). In the cutting blade 25, the cutting blade 25a is curved in a convex bow shape or an arc shape, and the intermediate portion of the cutting blade 25a in the longitudinal direction protrudes outward (front side) as compared with both end portions (FIG. 18 (e). )). In the cutting blade 26, the cutting blade 26a is curved in a concave bow shape or an arc shape, and the intermediate portion of the cutting blade 26a in the longitudinal direction is recessed inward (rear side) as compared with both end portions (FIG. 18 (f)). )).

In this second embodiment, when the spacer Sp2 is positioned on the front portion 121 of the support 120 and then the rear edge of the cutting blade 210 is pressed against the front edge of the spacer Sp2, the cutting blade 210 is pressed. The posture of the cutting blade 210 is aligned so that the posterior edge extends along the front edge of the spacer Sp2, and the longitudinal direction of the cutting blade 210 is indicated by the longitudinal direction of the spacer Sp2, that is, the arrows L and R. It can be aligned in the left and right directions shown. Further, after positioning the spacer Sp2 on the front portion 121 of the support 120, the spacer Sp2 is slid to the front side indicated by the arrow F, and the front edge of the spacer Sp2 is cut to the rear edge of the cutting blade 210. When the cutting blade 210 is pressed by the spacer Sp2 in contact with the cutting blade 210, the cutting blade 111 of the cutting blade 210 is placed in a state where the postures of the cutting blade 210 are aligned so that the longitudinal direction of the cutting blade 210 is in the left-right direction. It can project outward (front side) from the front end of the support 120.

(Third Embodiment)
FIG. 19 is a perspective view of the cutting tool of the third embodiment. FIG. 20 is an enlarged plan view of the cutting tool of the third embodiment. The same parts as those of the cutting tools 100 and 200 of the first embodiment and the second embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 19 and 20, the cutting tool 300 of the third embodiment has a support 120, a cutting blade 310, and a spacer Sp3. Of these, the support 120 is the same as the support 120 of the first embodiment. In this third embodiment, the cutting blade 310 corresponds to the cutting blade, the support 120 corresponds to the support, and the upper surface 121U of the support 120 corresponds to the support surface (see FIGS. 1 and 2). ..

In the cutting tool 200 of the second embodiment shown in FIG. 15, the longitudinal direction of the cutting blade 210 and the longitudinal direction of the support 120 extend in the same direction (left-right direction), but the third one shown in FIGS. 19 and 20. In the cutting tool 300 of the embodiment, the longitudinal direction of the cutting blade 310 is inclined with respect to the longitudinal direction of the support 120. Therefore, the cutting blade 111 of the cutting blade 310 projects obliquely from the front end 120a of the support 120 to the outside (front side) with respect to the longitudinal direction of the support 120. In other words, the amount of protrusion of the cutting blade 310 that projects outward (front side) from the front end 120a of the support 120 gradually increases from the right side indicated by arrow R to the left side indicated by arrow L, and the protrusion of the left side portion of the cutting blade 310. The amount W1 is larger than the overhang amount W2 on the right side (W1> W2). As a result, when the work material is cut by the cutting tool 300, the cutting blade 111 of the cutting blade 310 gradually bites into the work material from the left side to the right side, so that the cutting tool 100 of the first embodiment and the cutting of the second embodiment are cut. The machinability can be improved as compared with the tool 200. In the illustrated example, the angle θ formed by the longitudinal direction of the cutting blade 310 and the longitudinal direction of the support 120 is within the range of 5 ° to 10 °.

Further, the cutting blade 310 of the third embodiment is different from the cutting blade 210 of the second embodiment in the arrangement direction of a large number of holes. The large number of holes 210h in the second embodiment are arranged at intervals along the longitudinal direction of the cutting blade 210, but the large number of holes 310h in the third embodiment are arranged with respect to the longitudinal direction of the cutting blade 310. They are arranged at intervals from each other along the direction of inclination. The angle formed by the longitudinal direction of the cutting blade 310 and the arrangement direction of the large number of holes 310h in the third embodiment is the same as the angle θ formed by the longitudinal direction of the cutting blade 310 and the longitudinal direction of the support 120. For example, the angle θ is 5 to 10 °. As a result, when the fixture 130 is inserted into the large number of holes 310h of the cutting blade 310 and screwed into the large number of holes 121h of the support 120 to fix the cutting blade 310 and the support 120, the longitudinal direction of the cutting blade 310 is supported. It is inclined at an angle θ with respect to the longitudinal direction of the body 120, and the cutting blade 111 of the cutting blade 310 is in a state of obliquely projecting outward (front side) from the front end 120a of the support 120. Similar to the cutting blade 210 of the second embodiment, the rear edge of the cutting blade 310 (the edge opposite to the cutting blade 111) extends in the longitudinal direction (left-right direction) of the cutting blade. There is. Further, similarly to the large number of holes 210h of the cutting blade 210 in the second embodiment, the large number of holes 310h of the cutting blade 310 in the third embodiment are elongated holes (elliptical holes), and the openings thereof are arrow F. It extends in the front-rear direction indicated by B and B, that is, in the direction intersecting the extending direction of the cutting edge 111. Specifically, the openings of the large number of holes 310h extend in a direction orthogonal to the arrangement direction of the large number of holes 310h.

The spacer Sp3 of the third embodiment differs from the spacer Sp2 of the second embodiment only in the shape seen from a plane. Regarding other features, the spacer Sp3 of the third embodiment and the spacer Sp2 of the second embodiment are the same, and the description thereof will be omitted. The spacer Sp2 of the second embodiment has a rectangular shape, while the spacer Sp3 of the third embodiment has a triangular shape. Specifically, the spacer Sp3 is a right triangle having the left side indicated by the arrow L as the base and the right side indicated by the arrow R as the apex, or a triangle close thereto, and the apex angle thereof is the longitudinal direction of the cutting blade 310 and the support 120. It is the same as the angle θ formed by the longitudinal direction of. For example, the angle θ is 5 to 10 °. Similar to the spacer Sp2 of the second embodiment, the spacer Sp3 is used by positioning it on the upper surface 121U of the front portion 121 of the support 120.

Specifically, the spacer Sp3 is supported by positioning the rear edge of the support 120 along the rear edge of the support 120 indicated by the arrow B of the front portion 121, that is, the step 120s of the support 120. It is placed on the upper surface 121U of the body 120. In this state, the spacer Sp3 is located on the rear side (the side of the rear portion 122) of the front portion 121 of the support 120. At this time, since the spacer Sp3 is triangular, the front edge of the spacer Sp3 (the front side indicated by the arrow F) is at an angle θ with respect to the longitudinal direction of the support 120 (the left-right direction indicated by the arrows L and R). It extends in a sloping direction.

Here, FIG. 21 is a front view showing a modified example of the support according to the third embodiment. As shown in FIG. 21, the cutting tool 300 of the third embodiment may use the support 320 instead of the support 120 shown in FIGS. 9, 10 and 13. The same portion as the support 120 is the same as the support 120, and the description thereof will be omitted. The upper surface 121U of the front portion 121 of the support 120 has a circular arc shape when viewed from the front, while the upper surface 321U of the front portion of the support 320 has an elliptical arc shape when viewed from the front. In this case, it is preferable that the elliptical arc of the upper surface 321U of the support 320 is set so that the cut end of the work material has a circular arc shape. In other words, when the upper surface 321U of the support 320 is attached by bending the plate surface (bottom surface) of the cutting blade 310, the plate surface of the cutting blade 310 and the cutting blade 111 are orthogonal to the longitudinal direction of the cutting blade 310. It is configured to be curved in an elliptical arc shape when viewed from the direction, but to be curved in a circular arc shape when viewed from the front side of the support 320 (the direction orthogonal to the longitudinal direction of the support 320). Is preferable. As a result, even if the longitudinal direction of the cutting blade 310 is inclined with respect to the longitudinal direction of the support 320, the work material can be cut into a circular arc shape. In this modification, the cutting blade 310 corresponds to the cutting blade, the support 320 corresponds to the support, and the upper surface 321U of the support 320 corresponds to the support surface.

22 is an enlarged plan view (a) to (b) showing a modified example of the cutting tool of the third embodiment. As shown in FIG. 22A, the cutting tool 300'has a cutting blade 31, a support 120, and a spacer Sp3. As shown in FIG. 22B, the cutting tool 300 ″ has a cutting blade 32, a support 120, and a spacer Sp3. The same parts as the cutting tools 100 and 300 are designated by the same reference numerals. The description thereof will be omitted. The support 120 is the same as the support 120 of the first embodiment. For these cutting tools 300 ′ and 300 ″, cutting blades 31 and 32 are used instead of the cutting blade 310, respectively. Has been done. The shapes of the cutting blades 31a and 32a of these cutting blades 31 and 32 are different from those of the cutting blade 111 of the cutting blade 310. The cutting blade 31a of the cutting blade 31 is curved in a convex bow shape or an arc shape, and the intermediate portion in the longitudinal direction protrudes to the outside (front side) of the cutting blade 31 as compared with both end portions (FIG. 22 (a)). )). The cutting blade 32s of the cutting blade 32 is curved in a concave bow shape or an arc shape, and the middle portion in the longitudinal direction is recessed inside (rear side) of the cutting blade 32 as compared with both end portions (FIG. 22 (b). )). These cutting blades 31 and 32 are fixed to the support 120 so that the longitudinal direction is inclined at an angle θ with respect to the longitudinal direction (horizontal direction) of the support 120, and the cutting blades 31a of the cutting blades 31 and 32 In 32a, the left side portion indicated by the arrow L projects from the right side portion indicated by the arrow R to the front side indicated by the arrow F. As a result, the cutting tools 300'and 300 "can improve the machinability as compared with the case where the cutting blades 31 and 32 and the support 120 are connected by aligning the longitudinal directions with each other. The cutting blades 31 and 32 correspond to the cutting blade, the support 120 corresponds to the support, and the upper surface 121U of the support 120 corresponds to the support surface (see FIGS. 1 and 2).

In this third embodiment, when the spacer Sp3 is positioned on the front portion 121 of the support 120 and then the rear edge of the cutting blade 310 is pressed against the edge of the spacer Sp3 on the front side, the cutting blade 310 The posture of the cutting blade 310 is aligned so that the posterior edge extends along the anterior edge of the spacer Sp3, and the longitudinal direction of the cutting blade 310 extends along the anterior edge of the spacer Sp3, that is. , The support 120 can be aligned in a direction inclined at an angle θ with respect to the longitudinal direction. Further, after positioning the spacer Sp3 on the front portion 121 of the support 120, the spacer Sp3 is slid to the front side indicated by the arrow F, and the front edge of the spacer Sp3 is cut to the rear edge of the cutting blade 310. When the cutting blade 310 is pressed by the spacer Sp3, the cutting blade 310 is cut in a aligned state so that the longitudinal direction of the cutting blade 310 is inclined at an angle θ with respect to the left-right direction. The cutting edge 111 of the blade 310 can be projected from the front end of the support 120 to the outside (front side).

(Fourth Embodiment)
FIG. 23 is a perspective view (a) and a partially disassembled perspective view (b) of the cutting tool of the fourth embodiment. The same parts as those of the cutting tool 100 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 23 (a) and 23 (b), the cutting tool 400 of the fourth embodiment is a cutter that rotates and cuts, and has a main body 420 and a plurality of cutting blades 410. The main body 420 has a cylindrical shape or a substantially cylindrical shape, and is provided with a plurality of support portions 421 on the outer periphery thereof. These plurality of support portions 421 have rigidity or mass capable of holding the cutting blade 410, and are arranged around the rotation axis O of the main body 420 at predetermined intervals. The support surface 421S is formed on the outer peripheral portion of the plurality of support portions 421 facing (facing) in the rotation direction indicated by the arrow P. The support surface 421S is a concave curved surface and is curved in a bow or arc shape in the direction along the rotation axis O (thickness direction of the main body 420), and the intermediate portions of the support surface 421S in the direction along the rotation axis O are on both sides. It is dented inward compared to.

Further, the cutting blade 410 has a rectangular thin plate shape when viewed from a plane, and the cutting blade 411 is formed along one end edge (side). The cutting blade 410 is configured such that the plate surface (upper surface and bottom surface) and the cutting blade 411 can be elastically deformed in a bow shape or an arc shape. The cutting blade 410 is configured to be detachably attached to the support portion 421 by the fixture 130. A hole 410h is formed in the cutting blade 410, and the hole 410h penetrates the plate surface of the cutting blade 410. A screw hole 421h is formed in the support portion 421, and the screw hole 421h is perforated from the support surface 421S to the inside of the support portion 421. In the illustrated example, the holes 410h of the cutting blade 410 and the screw holes 421h of the support portion 421 are each round holes, and four holes are formed. The fixture 130 is the same as the fixture 130 of the first embodiment, and is, for example, a bolt or a screw. In the fourth embodiment, the cutting blade 410 corresponds to the cutting blade, the support portion 421 of the main body 420 corresponds to the support, and the support surface 421S corresponds to the support surface.

In the fourth embodiment, when the fixture 130 is screwed into the screw hole 421h of the support portion 421 through the hole 410h of the cutting blade 410 and the cutting blade 410 is attached to the support portion 421 of the main body 420, the plate surface of the cutting blade 410 is formed. The cutting edge 411 is elastically deformed into the surface shape of the support surface 421S or a shape close to the surface shape, and becomes a concave curved surface shape. In other words, the plate surface of the cutting blade 410 and the cutting blade 411 are curved in a bow shape or an arc shape when viewed from the side. When the cutting blade 410 is removed from the support portion 421 of the main body 420, the plate surface of the cutting blade 410 and the curvature of the cutting blade 411 become gentle. That is, the radius of curvature of the plate surface of the cutting blade 410 and the cutting blade 411 is larger than the radius of curvature of the support surface 421S. As a result, the cutting tool 400 can cut the plate surface of the cutting blade 410 and the cutting blade 411 by bending them in an arch shape or an arc shape, and remove the cutting blade 410 from the main body 420 to cut the cutting blade 410. The re-polishing of the blade 411 can be easily performed. In the illustrated example, the main body 420 includes six support portions 421, and the main body 420 has six cutting blades 410.

(Fifth Embodiment)
FIG. 24 is a perspective view (a) and a partially disassembled perspective view (b) of the cutting tool of the fifth embodiment. The same parts as those of the cutting tool 100 of the first embodiment and the cutting tool 400 of the fourth embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 24 (a) and 24 (b), the cutting tool 500 of the fifth embodiment is a cutter that rotates and cuts like the cutting tool 400 of the fourth embodiment, and has a main body 520. It has a plurality of cutting blades 410. The support surface 421S of the fourth embodiment shown in FIG. 23B is a concave curved surface, and is formed on a portion of the outer peripheral portion of the support portion 421 that faces the rotation direction around the rotation axis O indicated by the arrow P. However, the support surface 521S of the fifth embodiment is a convex curved surface, and faces the outer peripheral portion of the support portion 521 in the main body 520 in a direction orthogonal to the rotation axis O (diameter direction of the main body 520). It is formed in the (facing) part. The support surface 521S is curved in a bow or arc shape in the direction along the rotation axis O (thickness direction of the main body 520), and the intermediate portion of the support surface 521S in the direction along the rotation axis O is outward as compared with both sides. It is bulging (raising).

Similar to the fourth embodiment, the cutting blade 410 is configured to be detachably attached to the support surface 521S of the support portion 521 by the fixture 130. A screw hole 521h is formed in the support portion 521, and the screw hole 521h is perforated from the support surface 521S to the inside of the support portion 521 (extending in the radial direction of the main body 520). In the illustrated example, the screw holes 521h of the support portion 521 are round holes, and four holes are formed. The cutting blade 410 is the same as the cutting blade 410 of the fourth embodiment. The fixture 130 is the same as the fixture 130 of the first embodiment, and is, for example, a bolt or a screw. In the fifth embodiment, the cutting blade 410 corresponds to the cutting blade, the support portion 521 of the main body 520 corresponds to the support, and the support surface 521S corresponds to the support surface.

In the fifth embodiment, when the fixture 130 is screwed into the screw hole 521h of the support portion 521 through the hole 410h of the cutting blade 410 and the cutting blade 410 is attached to the support portion 521 of the main body 520, the plate surface of the cutting blade 410 is formed. The cutting edge 411 is elastically deformed into the surface shape of the support surface 521S or a shape close to the surface shape, and becomes a convex curved surface shape. In other words, the plate surface of the cutting blade 410 and the cutting blade 411 are curved in a bow shape or an arc shape when viewed from the side. At this time, in the cutting blade 411 of the cutting blade 410, the intermediate portion in the direction along the rotation axis O (thickness direction of the main body 520) is arranged outside the main body 520 from both ends, and the cutting blade 411 is arranged in the direction along the rotation axis O (thickness of the main body 520). Both ends of the direction) are arranged inside the main body 520 from the middle portion. Therefore, when the cutting tool 500 is rotated around the rotation axis O indicated by the arrow P to cut the work material, both ends of the cutting blade 411 of the cutting blade 410 do not hit the work material or are difficult to hit. It is possible to obtain a clean cutting surface in which streaks do not or do not easily enter the cutting surface of the cutting material. In the illustrated example, the main body 520 includes six support portions 521, and the main body 520 has six cutting blades 410.

(Sixth Embodiment)
FIG. 25 is a perspective view (a) and an exploded perspective view (b) of the cutting tool of the sixth embodiment. The same parts as those of the cutting tool 100 of the first embodiment and the cutting tool 400 of the fourth embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 25 (a) and 25 (b), the cutting tool 600 of the sixth embodiment is a cutting tool used by being attached to a lathe or the like, and includes a rectangular parallelepiped main body 620 and a cutting blade 610 extending in one direction. have. The main body 620 has a support surface 620S formed on one end surface in the longitudinal direction. The support surface 620S is a concave curved surface. Specifically, the support surface 620S is curved in a bow or arc shape in a direction orthogonal to the longitudinal direction of the main body 620 (the lateral direction of the main body 620), and is intermediate in the lateral direction of the support surface 620S. The part is recessed inward from both sides. Further, the cutting blade 610 has a rectangular thin plate shape when viewed from a plane, like the cutting blade 410 of the fourth embodiment, and the cutting blade 611 is formed along one end edge (side). The cutting blade 610 is configured such that the plate surface and the cutting blade 611 can be elastically deformed in a bow shape or an arc shape.

Here, FIG. 26 is a perspective view (a) and an exploded perspective view (b) showing a modified example of the cutting tool of the sixth embodiment. The same parts as those of the cutting tool 600 of the sixth embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 26 (a) and 26 (b), the cutting tool 600 ′ has a rectangular parallelepiped support 620 ′ extending in one direction and a cutting blade 610. The support surface 620S of the sixth embodiment is formed on one end surface of the main body 620 in the longitudinal direction, but the support surface 620S'of the modified example is formed on the side surface extending in the longitudinal direction of the main body 620'and is formed on the main body. It is arranged on one end side in the longitudinal direction of 620'. The support surface 620S'is a concave curved surface, and is curved in a bow shape or an arc shape in a direction orthogonal to the longitudinal direction of the main body 620'(the lateral direction of the main body 620'). The intermediate portion of the support surface 620S'in the lateral direction is recessed inward (lower side in the illustrated example) from both sides. The cutting blade 610 is the same as the cutting blade 610 of the sixth embodiment.

The cutting blade 610 is configured to be detachably attached to the support surfaces 620S and 620S'of the main bodies 620 and 620'by the fixture 130. Specifically, the cutting blade 610 is formed with a hole 610h penetrating the plate surface. Screw holes 620h and 620h'are formed in the main bodies 620 and 620'. The screw holes 620h and 620h'are perforated from the support surfaces 620S and 620S'to the inside of the main body 620 and 620'. That is, the screw hole 620h of the sixth embodiment extends in the longitudinal direction of the main body 620 or a direction close thereto, and the screw hole 620h'of the modified example is in a direction orthogonal to the longitudinal direction of the main body 620'(short direction). Or it extends in a direction close to it. In the illustrated example, the holes 610h of the cutting blade 610 and the screw holes 620h and 620h'of the main bodies 620 and 620'are round holes, and three holes are formed. The fixture 130 is the same as the fixture 130 of the first embodiment, and is, for example, a bolt or a screw. In the sixth embodiment, the cutting blade 610 corresponds to the cutting blade, the main bodies 620 and 620'correspond to the support, and the support surfaces 620S and 620S' correspond to the support surface.

In the sixth embodiment, the fixture 130 is screwed into the screw holes 620h and 6201h'of the main bodies 620 and 620'through the holes 610h of the cutting blade 610, and the cutting blade 610 is attached to the main bodies 620 and 620'. The plate surface of 610 and the cutting edge 611 are elastically deformed into the surface shape of the support surfaces 620S and 620S'or a shape close to the surface shape to form a concave curved surface. In other words, the plate surface of the cutting blade 610 and the cutting blade 611 are curved in a bow shape or an arc shape when viewed from the side. When the cutting blade 610 is removed from the main body 620, 620', the plate surface of the cutting blade 610 and the curvature of the cutting blade 611 become gentle due to the restoring force of the cutting blade 610. That is, the plate surface of the cutting blade 610 and the radius of curvature of the cutting blade 611 are larger than the radius of curvature of the support surfaces 620S and 620S'. As a result, the cutting tools 600 and 600'can cut the plate surface of the cutting blade 610 and the cutting blade 611 by bending them in an arch shape or an arc shape, and remove the cutting blade 610 from the main body 620 and 620'. , The cutting blade 611 of the cutting blade 610 can be easily re-polished.

The cutting tools 100, 200, 300, 300', 300 ", 400, 500, 600, 600' from the first embodiment to the sixth embodiment are not limited to the above illustrated examples. It goes without saying that various changes can be made without departing from the gist of the present invention. For example, the cutting blades 111, 211, and 311 of the cutting blades 110, 210, and 310 are made of cemented carbide, but the cutting blade 110, The entire 210, 310 may be made of cemented carbide, or the cutting blades 110, 210, 310 may not be provided with a cemented carbide portion. In other words, the cutting blades 111, 210, 310 of the cutting blades 110, 210, 310, The materials of the cutting blades 110, 210 and 310 and the overall materials of the cutting blades 110, 210 and 310 are not limited to cemented carbide. The materials of the cutting blades 111, 211 and 311 of the cutting blades 110, 210 and 310 are other materials. The material may be suitable for cutting, or the entire material of the cutting blades 110, 210, 310 may be a material suitable for other cutting.

Further, the upper surfaces 121U, 121U', 121U "of the first to third embodiments, the support surface 421S of the fourth embodiment, and the support surfaces 620S, 620S'of the sixth embodiment are concave curved surfaces. , Convex curved surface. Thereby, the plate surfaces of the cutting blades 110, 210, 21, 22, 23, 24, 25, 26, 310, 31, 32, 410, 610 and the cutting blades 111, 21a, 22a, 23a, The 24a, 25a, 26a, 411, and 611 can be curved in a convex bow shape or an arc shape. Similarly, the support surface 521S of the fifth embodiment is a convex curved surface, but may be a concave curved surface.

The cutting blades 110, 210, 21, 22, 23, 24, 25, 26, 310, 31, 32 and the supports 120, 120', 120 ", 320 in the first to third embodiments. In the connected state, the bottom surface 110D of the cutting blades 110, 210, 310, 31, 32 and the top surfaces 121U, 121U', 121U ", 321U of the supports 120, 120', 120" and 320 cover the entire surface. It may or may not be in close contact over the entire surface, that is, the bottom surface 110D of the cutting blades 110, 210, 310, 31, 32 and the supports 120, 120', 120 ", 320. The upper surfaces 121U, 121U', 121U ", and 321U may be partially in contact with each other or may not be in contact with each other at all.

Similarly, in the connected state of the cutting blades 410 and 610 and the main bodies 420, 520, 620 and 620'in the fourth to sixth embodiments, the plate surfaces of the cutting blades 410 and 610 and the main bodies 420 and 520' , 620, 620'support surfaces 421S, 521S, 620S, 620S' may or may not be in close contact with each other over the entire surface. That is, the plate surfaces of the cutting blades 410 and 610 and the support surfaces 421S, 521S, 620S and 620S'of the main bodies 420, 520, 620 and 620'may be partially in contact with each other or not at all. You may.

Further, the cutting blades 111, 411, 611 of the cutting blades 110, 410, 610 from the first embodiment and the fourth to sixth embodiments are straight lines extending in the extending direction of the cutting blades 110, 410, 610. However, it may be a straight line inclined with respect to the extending direction of the cutting blades 110, 410, 610, or may be a bow shape or an arc shape recessed inward (concave shape) or bulged outward (convex shape). You may. Further, the cutting blade 110 of the first embodiment may be attached to the support 120 so that the longitudinal direction is inclined with respect to the longitudinal direction of the support 120.

The upper surfaces 121U and 321U of the support 120 in the second embodiment and the third embodiment, and the support portions 421 and 521 and the support surfaces 421S and 521S of the main bodies 620 and 620'in the fourth to sixth embodiments. , 620S, 620S'are the cutting blades 111, 21a, 22a, 23a, 24a, 25a, 26a of the cutting blades 210, 21, 22, 23, 24, 25, 26, 310, 31, 32, 410, 610. Both ends corresponding to both ends in the direction in which 31a, 32a, 411, and 611 extend or in a direction close thereto may have a radius of curvature smaller than the radius of curvature of the intermediate portion.

Further, in the fourth to sixth embodiments, the large number of holes 410h and 610h of the cutting blades 410 and 610 are round holes, but the cutting blades 210, 21 and 22 of the second and third embodiments. , 23, 24, 25, 26, 310 may be the same elongated holes as the numerous holes 210h, 310h. Thereby, the amount of protrusion of the cutting blade 410 protruding outward from the support portions 421 and 521 of the main body 420 and 520 and the amount of protrusion of the cutting blade 610 protruding outward from the main bodies 620 and 620'can be adjusted.

In this case, the cutting tools 400, 500, 600, 600'from the fourth embodiment to the sixth embodiment are provided with spacers as in the spacers Sp2 and Sp3 of the second embodiment and the third embodiment. You may. The spacer is positioned in contact with the positioning surface 421P, 521P, 620P, 620P'. The positioning surface 421P, 521P, 620P, 620P'is a wall surface of a portion protruding from the support surface 421S, 521S, 620S, 620S', and is orthogonal to or intersects the support surface 421S, 521S, 620S, 620S'. .. The positioning surface 421P of the fourth embodiment is provided on the side of the support surface 421S facing the rotation axis O (inside the main body 420) (see FIG. 23B). The positioning surface 521P of the fifth embodiment is provided on the side opposite to the rotation direction indicated by the arrow P of the support surface 521S (see FIG. 24B). The positioning surfaces 620P and 620P'of the sixth embodiment are provided on the stepped side of the support surfaces 620S and 620S' (see FIGS. 25 (b) and 26 (b)). This makes it easy to determine the posture and position the cutting blades 410 and 610.

Further, in the cutting blades 410 and 610 from the fourth embodiment to the sixth embodiment, the cutting blades 411 and 611 project obliquely outward as in the cutting blades 310, 31 and 32 of the third embodiment. As described above, it may be attached to the support portions 421 and 521 and the main body 620 and 620'. As a result, machinability can be improved.

In the fourth and fifth embodiments, four holes 410h of the cutting blade 410 and four screw holes 421h and 521h of the support portions 421 and 521 are formed, but any number of the holes 410h may be used. They may be formed one by one, two or three, or five or more. Similarly, in the sixth embodiment, the holes 610h of the cutting blade 610 and the screw holes 620h and 620h'of the main bodies 620 and 620'are formed three by three, but any number may be formed and one by one is formed. It may be formed in groups of two, or it may be formed in groups of four or more. In the fourth to sixth embodiments, the holes 410h and 610h of the cutting blades 410 and 610 may or may not have threads formed on the inner circumference.

Further, in the fourth embodiment and the fifth embodiment, six support portions 421 and 521 of the main body 420 and 520 are formed around the rotation axis O, but the number of support portions 421 and 521 may be any number. , The support portions 421 and 521 of the main body 420 and 520 may be formed in a number less than six around the rotation axis O, or may be formed in the number of 7, 8, or 9 or more. In this case, the cutting blade 410 is attached to all the support portions 421 and 521.

In the cutting tools 400 and 500 of the fourth and fifth embodiments, the support portions 421 and 521 of the main body 420 and 520 extend in the direction along the rotation axis O (thickness direction of the main body 420 and 520). , The support portions 421 and 521 may be twisted in one direction with respect to the direction along the rotation axis O (single-edged twist), and the support portions 421 and 521 adjacent to each other around the rotation axis O are along the rotation axis O. It may be twisted in different directions with respect to the direction (alternate twist). In this case, it is preferable that the curved shape of the support surfaces 421S and 521S in the support portions 421 and 521 is modified by the twist angle of the support portions 421 and 521.

Further, in the fourth embodiment and the fifth embodiment, the cutting blade 411 of the cutting blade 410 may be curved in a convex or concave arc shape, and the cutting blade 411 of the cutting blade 410 has support portions 421 and 521. The cutting blade 410 may be attached obliquely to the support portions 421 and 521 so as to project obliquely from the to the outside. In this case, it is preferable that the curved shape of the support surfaces 421S and 521S in the support portions 421 and 521 is modified by the inclination of the cutting blade 410. As a result, even if the cutting blade 410 is attached obliquely to the support portions 421 and 521, the cutting blade 410 can be accurately cut with the curved shape of the cutting blade 411.

100,200,300,300', 300 ", 400,500,600,600' ... Cutting tools, 110,210,21,22,23,24,25,26,310,31,32,410,610 ... Cutting blades, 110D, 120D ... bottom surface, 110F, 120F ... front surface, 110U, 121U, 121U', 121U ", 122U, 321U ... top surface, 110h, 210h, 310h, 410h, 610h ... holes, 111,21a, 22a, 23a , 24a, 25a, 26a, 31a, 32a, 411,611 ... Cutting edge, 120, 120', 120 ", 320 ... Support, 120a ... Front end, 120s ... Step, 121 ... Front part, 121h, 421h, 521h, 620h, 620h'... Screw hole, 122 ... Rear part, 122h ... Stepped hole, 130 ... Fixture, 420,520, 620, 620' ... Main body, 421,521 ... Support part, 421S, 521S, 620S, 620S' ... Support surface, 421P, 521P, 620P, 620P'... Positioning surface, l1, l2 ... Left end, r1, r2 ... Right end, m1, m2 ... Intermediate, W1, W2 ... Overhang, Sp2, Sp3 ... Spacer B , D, F, L, P, R, U ... arrow, O ... rotation axis, θ ... angle.

Claims (6)

A cutting tool having a plate-shaped cutting blade having a cutting blade at one end, a support to which the cutting blade can be detachably attached, and a fixed structure for fixing the cutting blade and the support.
The cutting blade is a blade that extends in one direction, and is composed of one blade as a whole. The cutting blade is formed at one end of the cutting blade over the entire length of the cutting blade in the longitudinal direction. The cutting blade is configured to be elastically deformable in the direction in which the plate surface and the cutting blade intersect the plate surface.
The support is a long member extending in one direction, has a front portion and a rear portion, and has a front portion and a rear portion.
The front portion and the rear portion are integrally formed, and are arranged adjacent to each other in a direction orthogonal to the longitudinal direction of the support.
The front portion is formed to have a larger plate thickness than the rear portion, the upper portion of the front portion is configured so that the plate surface of the cutting blade can be placed, and the support surface of the front portion is concave curved or convex. It is curved like a curved surface,
The bottom surface of the support is formed flat over the entire surface.
The fixing mechanism fixes the plate surface of the cutting blade to the support surface of the support while holding the plate surface of the cutting blade and the cutting blade in the surface shape of the support surface of the support. A cutting tool characterized by being configured to allow. The front end surface of the front portion of the support is curved in a convex shape that gradually recedes from the center to both ends in the longitudinal direction of the support when viewed from above, and gradually recedes from the upper end to the lower end when viewed from the side. The cutting tool according to claim 1, wherein the cutting tool is inclined so as to retreat to. Cutting tool according to claim 1 or 2, characterized in that it comprises different radii of curvature from each other and the longitudinal ends of the supporting surface and the intermediate portion of the support. The cutting tool according to claim 3 , wherein both ends of the support surface of the support have a radius of curvature smaller than the radius of curvature of the intermediate portion. The cutting tool according to claim 3 , wherein the intermediate portion of the support surface of the support is formed flat, and both ends thereof are curved in a bow shape or an arc shape. A third to fifth aspect of the present invention, wherein both ends of the support surface of the support are arranged at a position higher than a position extending from the intermediate portion to both ends in the radius of curvature of the intermediate portion. The cutting tool according to any one item.

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