JP7043101B1 - Cutting tools - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce and continuously form a deep groove locally which is caused by a blade being caught or bitten and hinders a smooth cutting of the blade thereafter with respect to a cutting tool such as a chisel, a deburring tool and a plastic cutter. A cutting tool that can continue to cut deeply and can be used as a hand-held machining tool. The cutting edge 2 is in contact with the surface to be cut 8 at a position having a certain distance from the cutting edge 2 on at least one side of the rake face 4 side or the flank surface 3 side, or the cutting edge 2 is said. A support portion 5a or 5b that can come into contact with the machined surface 8 while biting into the machined surface 8 is provided. [Selection diagram] Fig. 1

Description

The present invention relates to a cutting tool for cutting or cutting materials such as wood, plastic materials and metal materials such as chisel, deburring tool and plastic cutter, and in particular, the cutting edge has a rake face. It relates to a cutting tool that is composed of ridges formed by intersecting flanks and is used as a hand-held tool.

Since ancient times, processing tools used for cutting and cutting include a vertical ax whose cutting edge is approximately parallel to the handle and a horizontal ax that is approximately perpendicular to the handle. The chouna and canna that are known are known. There are many other things that are similar to the structure of a vertical ax, such as hand-held blades such as knives and knives, and horizontal saws with shavings. Not many.

The cutting edges of traditional horizontal axes such as chona and plane, and the cutting edges of drills and end mills used for machining consist of straight or curved ridges formed by the intersection of the rake face and the flank surface. Will be done. During machining, the cutting edge is pushed into the work piece, chips are scooped along the rake face on the traveling direction side of the cutting edge, and the flank surface interferes with the work piece after the cutting edge advances. In order to avoid this, it is provided to have an appropriate angle.

The reason why the vertical ax is used more often than the horizontal ax is that the vertical ax simply presses the cutting edge against the work piece and moves the blade in the direction of the ridge that constitutes the cutting edge, so it is easy to process by hand. On the other hand, as mentioned above, the horizontal ax has a large machining resistance because the ridgeline direction of the cutting edge is perpendicular to the progress direction of the machining, and it is difficult to cut the ax stably by human hands.

Basically, the chisel that you actually get in the field of education is a flat sword, a round sword, a cutout, etc. It seems that not a few people have had the experience of trying and failing.

7A and 7B are views showing an example of a state in which a blade having a vertical ax structure is used to cut a work piece. FIG. 7A is a perspective view, and FIG. 7B is a cutting edge pushed into the work piece. It is sectional drawing which shows the state. In this way, even if an attempt is made to cut off the object to be cut 10 using a vertical ax-like blade 9 such as a kitchen knife or knife, the blade bites slightly, but the thickness of the blade that gradually becomes thicker than the cutting edge becomes a large resistance. , It is difficult to cut deeply.

In order to solve that problem, when we actually made a small chona with a ridgeline length of 10 mm and processed wood and plastic materials by pulling, the surface was slightly scraped at the beginning, but the blade Since the bite occurs discontinuously, specifically, the stop due to catching and the advancement of the blade due to the elimination occur alternately, so if this is repeated, the groove due to catching will grow deeply at multiple places, and finally It becomes impossible to process. Products similar to this example are sold online as scraped knives, planers, oysters, oysters, etc., but they are rarely found in stores such as home improvement stores.

In the field of machining, the above-mentioned cutting method has been established as a processing method for cutting with a cutting edge having a rake surface and a flank surface in a lathe or a milling machine, but in the case of a lathe, it is called a cutting tool. By fixing the cutting tool to be cut on a robust table and adjusting the operation of the table itself, a mechanism is used to bring the tip of the cutting tool into contact with the surface of the object to be machined, which rotates at high speed. For example, the front milling cutter uses a mechanism that rotates the cutting edge on which the ridge line is arranged from the center of rotation toward the outer periphery and brings it into contact with the work piece fixed to the table. That is, in each case, a fixing mechanism is provided so that the cutting edge and the work piece do not unexpectedly deviate due to mutual contact.

However, when cutting with a hand-held tool, it is difficult to cut stably even for relatively soft materials such as wood and plastic materials due to the low rigidity of holding the blade. Especially when wood is processed at right angles to the grain, this phenomenon is remarkable, and since it is difficult to process hard wood grain, it tends to have large irregularities, and because plastics such as acrylic and polyethylene are soft, more local biting progresses. It tends to be deep and difficult to cut deeply.

Further, as a processing tool that can be cut off, Patent Document 1 uses a blade having a vertical ax structure, and a holder for applying a force by supporting a blade having a predetermined width for carving a streak on the surface of a model by hand. It is a muscle carving sword that is attached to the blade, and is characterized by making it possible to replace the blade with a holder so that the direction of muscle carving by the blade of the blade can be freely changed to the front side or the front side. The muscle carving sword is described.

However, the muscle carving sword disclosed here is a sword that digs a narrow and very shallow muscle, although a certain effect can be obtained in improving the workability of the muscle carving due to the mounting structure of the holder and the blade. It is not intended to have a width of mm or more and a notch, and as described above, the thickness of the blade that gradually becomes thicker than the cutting edge causes a large resistance, and it is difficult to make a deep cut.

Japanese Unexamined Patent Publication No. 2012-034817

The problem of the present invention is to reduce the formation of locally deep grooves that are caused by the blade being caught or biting and hindering the smooth cutting of the blade thereafter, and it is possible to continuously and deeply cut the tool. Is to provide a cutting tool that can be used as a tool.

The present invention has been made as a result of studying to provide a cutting tool having a horizontal ax structure with a structure for improving the stability of operation on the surface of the workpiece in order to solve the above-mentioned problems.

According to the present invention, the cutting edge is composed of a ridge line formed by intersecting a rake face and a flank surface, and the cutting edge is moved toward the rake face side while being pushed into the machined surface to be cut. A cutting tool having a function of cutting a surface, in which the cutting edge abuts on the surface to be cut at a position having a certain distance from the cutting edge on at least one side of the rake face side or the flank surface side. A cutting tool can be obtained in which a support portion that can come into contact with the surface to be cut is provided in a state where the cutting tool is cut or the cutting edge bites into the surface to be cut.
According to the present invention, the cutting edge is composed of a ridge line formed by intersecting a rake face and a flank surface, and the cutting edge is moved toward the rake face side while being pushed into the machined surface to be cut. A cutting tool having a function of cutting a surface, having a shape or R processing having a blunt tip at a position having a certain distance from the cutting edge on at least one side of the rake face side or the flank face side. It has a chamfered shape and is provided with a support portion that can come into contact with the machined surface in a linear or point shape, and the support portion has a thickness equal to or less than the width of the cutting edge and is covered. When cutting a cutting surface, the cutting edge is cut with at least one of the support portions as a fulcrum, from the state where the cutting edge is in contact with the surface to be cut to the state where the cutting edge bites into the surface to be cut. A cutting tool characterized by continuously adjusting the depth can be obtained.
According to the present invention, the cutting edge is composed of a ridge line formed by intersecting a rake face and a flank surface, and the cutting edge is moved toward the rake face side while being pushed into the machined surface to be cut. A cutting tool having a function of cutting a surface, having a shape or R processing having a blunt tip at a position having a certain distance from the cutting edge on at least one side of the rake face side or the flank face side. It has a chamfered shape and is provided with a support portion that can come into contact with the machined surface in a linear or point shape, and the support portion has a thickness equal to or less than the width of the cutting edge and the cutting edge. The support portion is on a straight line in the direction of moving the cutting edge toward the rake surface when viewed from the direction of pushing the machine into the surface to be cut, and when the surface to be cut is cut, the cutting edge is said to be cut. Cutting characterized in that the cutting depth of the cutting edge is continuously adjusted with at least one of the supporting portions as a fulcrum from the state of being in contact with the surface to the state of the cutting edge biting into the surface to be cut. You get the tool.

Further, according to the present invention, the cutting tool is obtained, wherein the rake face is composed of at least one plane or curved surface, and the flank surface is composed of at least one plane or curved surface. ..

Further, according to the present invention, a recess having a width of 1 mm or more and a depth of 1 mm or more is provided between the cutting edge and the support portion provided on the rake face side. The cutting tool described above is obtained.

Further, according to the present invention, the cutting tool is obtained, wherein the tip of the support portion has a chamfered shape having an R of 0.3 mm or more .

Further, according to the present invention, the rake face and the machined surface are arranged in a state where a straight line connecting the cutting edge and the tip of the support portion provided on the rake face side is arranged parallel to the machined surface. The above-mentioned cutting tool is obtained, wherein the angle formed by the normal is −10 ° or more.

Since the cutting tool according to the present invention is provided with a support portion that comes into contact with the non-cutting surface at the same time as the cutting edge, a deep local groove that is generated by the cutting edge being caught or biting and hindering the smooth cutting of the cutting edge thereafter. By reducing the formation of the cutting tool and manipulating it by hand, it is possible to provide a cutting tool capable of continuously and deeply cutting.

Further, if cutting is performed with at least one of the two support portions provided on the rake face side and the flank side of the cutting edge in contact with the surface to be cut at the same time as the cutting edge, the cutting edge becomes more than necessary. Since the support portion functions as a stopper to prevent the material from biting into the object to be cut, that is, it functions in the same manner as the table in the table canna, the cutting process can be performed in a stable state.

Further, by selecting the shape of the rake face and the flank surface from a flat surface and a curved surface, the shape of the cutting edge can be made into various shapes, so that it is possible to correspond to the material of the work piece and the required groove shape.

Further, since the space between the support portion on the rake face side and the cutting edge has a concave shape as described above, the cutting chips generated by cutting are quickly discharged to the outside of the work piece, and the cutting work is smoothly performed. Since the tip of the support portion is treated so as not to have a tip shape, it is possible to perform the cutting work without damaging the surface of the work piece.

Further, in the cutting tool of the present invention, by adjusting the relative positions of the support portion on the rake face side and the cutting edge, the normal of the cutting surface when the cutting edge abuts or bites into the cutting surface. The angle formed by the rake face, that is, the rake angle can be set to −10 ° or more, which also improves the workability of cutting.

The figure which shows the part of the blade of the example of the cutting tool which concerns on this invention. A diagram showing an example of a state in which a handle is attached to a blade and the blade is used to cut the surface to be cut. Perspective view showing an example of various shapes of the cutting edge of the cutting tool according to the present invention. An example in which the blade of the cutting tool according to the present invention can be replaced. Perspective view showing an example of carving a surface to be cut with the cutting tool according to the present invention. A conceptual diagram showing an example of an appropriate arrangement of cutting edges in a cutting tool according to the present invention. The figure which shows the example of the state which cuts the work piece using the blade of the vertical ax structure.

Next, an embodiment of the present invention will be described with reference to a specific diagram. 1A and 1B are views showing a blade portion of an example of a cutting tool according to the present invention, FIG. 1A is a perspective view, and FIG. 1B is a side view. The blade 1 exemplified here is composed of a ridge line formed by the cutting edge 2 intersecting the flank surface 3 and the rake face 4, and the flank surface is separated from both sides of the flank surface 3 and the rake surface 4 at a certain distance. A support portion 5a on the side and a support portion 5b on the rake face side are provided. The width of the cutting edge 2, that is, w, depends on the thickness of the material constituting the blade and is adjusted according to the purpose of use.

Further, since the frictional resistance between the side surface of the blade 1 and the object to be cut increases as the object to be cut is carved by the cutting edge 2, the thickness of the blade 1 is preferably smaller than the width w of the cutting edge 2. .. Generally, the angle formed by the rake face 4 and the normal of the machined surface is referred to as a rake angle, but θ1 in FIG. 1B corresponds to the rake angle, and the rake face 4 is on the rake face side. When it is inclined toward the support portion 5b, the angle is- (minus).

FIG. 2 is a diagram showing an example of a state in which a handle 6 is attached to the blade 1 shown in FIG. 1 and the blade 1 is used to cut the machined surface 8 of the workpiece 7. FIG. 2A. 2 shows a state in which the cutting edge 2 and the support portion 5b on the rake face side are in contact with the machined surface 8, and FIG. 2B shows the cutting edge 2 and the support portion 5a on the flank surface side in contact with the machined surface. FIG. 2C shows a state in which the support portion 5a on the flank side and the support portion 5b on the rake face side are in contact with the surface to be cut, and the cutting edge 2 bites into the object to be cut. The cutting process is performed by pushing the cutting edge 2 into the surface to be cut 8 and moving it in the direction of the handle 6 in the drawing.

With this configuration, for example, if the handle 6 is moved downward from the state where the support portion 5a on the flank side is pressed against the machined surface 8, the cutting edge 2 gradually approaches and comes into contact with the machined surface 8. In this state, if the entire blade 1 is moved in the front-rear direction and the left-right direction in the figure like a saw, the cutting edge 2 gradually cuts in the depth direction of the workpiece 7, so that local catching is unlikely to occur.

Further, when there is an uneven portion such as a tight grain or a step, the handle 6 can be cut by adjusting the vertical and front-back movements of the handle 6 by relying on the response such as catching and cutting resistance. Further, in the case of a large thin plate or the like, it may be cut along a guide ruler or the like.

Similarly, the support portion 5b on the rake face side may be brought into contact with the surface to be cut 8 for processing. For example, when the right end of the work piece 7 is machined in FIG. 2, the support portion 5b on the rake face side first comes off from the work surface 8, and the cutting edge 2 still on the work piece 7 tends to bite due to the impact at that moment. In such a case, it may be processed by switching to the support portion 5a on the flank side.

Further, it is also possible to allow the cutting edge 2 to bite into the object to be cut 7 so that the support portion 5a on the flank side and the support portion 5b on the rake face side are simultaneously brought into contact with the surface to be cut 8 for processing. In this case, as described above, either or both of the support portions function as stoppers.

If the handle 6 protrudes toward the machined surface 8 side from the extension line connecting the cutting edge 2 and the support portion 5a on the rake face side, the handle 6 precedes the support member 5b on the rake face side. Will come into contact with the surface to be cut 8 and hinder the angle adjustment. Therefore, when the handle 6 is attached, it is desirable to design so that such a state does not occur.

On the contrary, when both the support portion 5a on the flank surface side and the support portion 5b on the rake face side are provided, the support portion 5b on the rake face side is more than the extension line connecting the support portion 5a on the flank surface side and the cutting edge 2. If the cutting edge 2 is protruding to the side to be cut, the cutting edge 2 cannot come into contact with the surface to be cut 8. Therefore, at least when the cutting edge bites into the object to be cut 7, the support portion 5a and the support portion 5b come into contact with the surface to be cut 8. Need to abut.

Therefore, when deeply cutting into the object to be cut 7, it is desirable that the pair of side surfaces of the blade 1 adjacent to the rake face 4 and the flank 3 do not have protrusions such as holding connections.

Further, when the cutting edge 2 cuts deeply into the work piece 7, the discharge of chips becomes a problem. Specifically, the chips are the flank 3 of the blade 1, the support portion 5a on the flank side, and the work piece 7. The cutting edge 2 cannot be exposed and processing becomes impossible. In order to prevent this, it is desirable to provide a recess with a width and depth of 1 mm or more between the flank 3 of the blade 1 and the support portion 5a on the flank side.

Further, if the tips of the support portion 5a on the flank side and the support portion 5b on the rake face side have a pointed shape, the cutting edge 2 is likely to be caught, and each support portion is likely to be caught or caught in the work piece 7. It is desirable that the tip has an obtuse angle or a chamfer of R0.3 mm or more.

Further, if the thickness of the blade 1 is larger than the width of the cutting edge 2, the contact area between the side surface of the blade 1 and the work piece increases as the cutting is made in the depth direction of the work piece 7, resulting in machining resistance. As mentioned above, such a structure is not desirable because of the large amount of. For the same reason, it is not desirable that the thickness of the support portion 5a on the flank side and the support portion 5b on the rake face side is larger than the width of the cutting edge 2.

FIG. 3 is a perspective view showing examples of various shapes of the cutting edge of the cutting tool according to the present invention. As described above, the cutting edge of the cutting tool of the present invention is formed by a ridge line formed by intersecting a rake face and a flank surface, and therefore, various shapes can be obtained by combining the shapes of the rake face and the flank surface.

3 (a) and 3 (b) are examples in which both the rake face and the flank surface are flat surfaces, the ridge lines are straight lines, and the lengths are different. FIG. 3C shows an example in which the rake face is a flat surface, the flank surface is a curved surface, the ridgeline is a curved line, and the bottom surface can be carved into a curved groove. FIG. 3D shows an example in which the rake face is a flat surface, the flank surface is a curved surface, and the ridgeline is a straight line, and FIG. 3E is an example in which both the rake face and the flank face are curved surfaces and the ridgeline is a straight line. .. Depending on the material of the work piece, these shapes are used properly when it is necessary to adjust the angle between the rake face and the flank surface.

FIG. 3 (f) shows an example of a cutting tool manufactured by cutting a cylindrical material with a lathe or the like. The ridgeline that constitutes the cutting edge is circular, and there is a feature that any part of the ridgeline can be used as the cutting edge. Further, FIGS. 3 (g) and 3 (h) are examples in which the structure of the cutting tool according to the present invention is given to the saw blade, and FIGS. 3 (i) and 3 (j) are bent into a steel strip. In the example of processing and manufacturing, FIG. 3 (j) shows that the rake face and the flank surface are composed of a flat surface and a curved surface, respectively.

FIG. 4 is an example in which the blade 11 of the cutting tool according to the present invention can be replaced. In the cutting tool according to the present invention, since it is basically the cutting edge 12 that is consumed, as shown in FIG. 5, it is also possible to fix the blade 11 separately with a screw 14 and replace it with a mounting hole. It is also possible to use 15 as a long hole and have a structure capable of finely adjusting the protrusion of the cutting edge 12.

Further, by providing a stopper 13 at a position on the flank side or the rake face side of the blade 11, which is wider than the blade 11 and limits the cutting of the blade 11 in the depth direction of the workpiece (not shown). , Can carve a groove of a certain depth. The stopper 13 also has the function of a support portion.

Further, when cutting the thin plate, it is possible to reduce the cracking of the portion and the disorder of the cross section by partial penetration, and therefore, it may be further used in combination with another cutting tool. Regarding the number of cutting edges 12, the number of cutting edges is the smallest at one place, and it is easy to re-polish when worn or broken, but there may be a plurality of places.

The angle of the rake face of the blade 11 is appropriately selected according to the material properties of the work piece, but if the angle between the perpendicular to the surface of the work piece and the rake face, that is, the rake angle is less than -10 °, the cutting efficiency is high. It is not desirable because it deteriorates extremely. It is desirable that the rake face and the flank surface are polished because the ridge line of the cutting edge 12 is difficult to form linearly if it is roughly cut or punched by a press. Further, a saw-shaped blade may be provided between the rake face side support portion 16 and the handle 17, and may be used in combination at the cutting start portion, the cutting end portion, the penetrating portion, and the like.

FIG. 5 is a conceptual diagram showing an example of an appropriate arrangement of cutting edges in the cutting tool according to the present invention. In the cutting tool according to the present invention, as shown in FIG. 5, the base angle θ2 of an isosceles triangle whose base is a straight line connecting the support portion 5a on the flank side and the support portion 5b on the rake face side is within 45 °. It is desirable that the cutting edge 2 is arranged in the range of. The example of FIG. 5A is 10 °.

The reason is that, as shown in FIG. 5 (b), when the cutting edge 2 is arranged near the position where the base angle of the isosceles triangle is 45 °, the support portion 5b on the rake face side is used as the object to be cut. In the case of processing by abutting and the case of processing by abutting the support portion 5a on the flank side with the object to be cut, the position of the handle integrated with the cutting edge rotates by 90 ° or more. When θ2 exceeds 45 °, it becomes difficult to hold and process the handle.

Further, when the support portion 5b on the rake face side is brought into contact with the surface to be cut while θ2 is larger than 45 °, the rake angle becomes smaller, the sharpness is lowered, and θ2 exceeds 45 °. When the support portion 5a on the flank surface side is brought into contact with the surface to be cut, the rake angle becomes too large, and the angle at which the flank and the rake face intersect is inevitably too small, resulting in a blade strength. Not desirable because it is reduced.

Next, examples of the present invention will be described below with reference to the drawings. FIG. 6 is a perspective view showing an example in which a surface to be cut is formed by the cutting tool according to the present invention.

As Example 1, a cutting tool prepared with a cutting edge width of 1.0 mm, a blade width of 0.8 mm, a support portion on the rake face side of 0.8 mm, and a rake angle of 10 ° with respect to the machined surface is prepared. did. The shape of this cutting tool is shown in FIG. 3 (a). An example of cutting using this is shown in FIG. 6 (a). Since this cutting tool has a narrow blade width, the cutting resistance is small, and an acrylic plate with a thickness of 5 mm prepared as an object to be cut along the ruler of the guide can be easily machined to a depth of 3 mm. In some cases, the blade partially penetrated the acrylic plate and became completely caught, but if necessary, processing from the back side and folding the acrylic plate can cut without problems. rice field.

In addition, a wood board with a thickness of 5 mm was prepared as the object to be cut, and it was possible to easily cut it out by partially penetrating it. In other words, it is possible to cut out without a waste hole, which conventionally had to be done by making a waste hole and cutting from there with a jigsaw, etc. I was able to get it.

As the second embodiment, a cutting tool having the same configuration as that of the first embodiment and having a support portion on the flank side was adjusted. This cutting tool was able to efficiently cut the object to be cut by using one of the support portions as a fulcrum at the end of the cutting start and the end of the cutting end where catching is likely to occur.

As Example 3, a cutting tool was prepared in which the width of the cutting edge was 11 mm, the width of the blade was 11 mm, the width of the support portion on the rake face side was 11 mm, and the rake angle was 0 °. The shape of this cutting tool is shown in FIG. 3 (b). An example of cutting using this is shown in FIG. 6 (b). Using this cutting tool, it was possible to partially machine a groove with a width of 11 mm on a work piece made of wood or an acrylic plate.

It has been confirmed that these partial grooves, steps, and other machining forms were possible with milling cutters and chisel machining in the past, but they are also possible with the cutting tool according to the present invention. In addition, it was possible to scrape the surface of the plastic card or business card, which is the object to be cut, so thin that it cannot be felt with the touch of a finger, and return it to the state before printing. Furthermore, deburring and chamfering of edges (edges) of processed products such as aluminum and iron and molded products could be easily performed.

As Example 4, a cutting tool was prepared in which the cutting edge and the tip of the support portion on the rake face side were formed into a rotating body shape with the outer circumference of rotation as the outer circumference. The shape of this cutting tool is shown in FIG. 3 (f). An example of cutting using this is shown in FIG. 6 (c). With this cutting tool, it was possible to safely and easily carve a groove with an arcuate cross section on a work piece made of wood or plastic. In addition, it was possible to remove protrusions, burrs, dirt, etc. at the corners that are the inner diameter of the work piece.

As described above, according to the present invention, it is possible to provide a hand-held and usable cutting tool that facilitates the work of cutting and cutting a plastic material or wood. It should be noted that the present invention is not limited to the above-described embodiment, and includes various modifications and modifications that can be conceived by a person having ordinary knowledge in the field of the present invention, and does not deviate from the gist of the present invention. Of course, even if there is a design change in the range, it is included in the present invention.

1, 11 blades
2, 12 Cutting edge 3 Escape surface
4 Scoop surface 5a Support part on the flank side
5b, 16 Support part on the rake face side 6 Handle 7,10 Work piece
8 Machined surface 9 Blade
13 Stopper 14 Screw
15 long hole

Claims (6)

The cutting edge is composed of a ridge line formed by intersecting the rake face and the flank surface, and the function of cutting the cut surface is performed by moving the cutting edge toward the rake surface side while pushing the cutting edge into the machined surface. A cutting tool having a shape with a blunt angle at the tip or a chamfered shape with R processing at a position having a certain distance from the cutting edge on at least one side of the rake face side or the flank face side. A support portion capable of linearly or point-like contact with the surface to be cut is provided, and the support portion has a thickness equal to or less than the width of the cutting edge and is used when cutting the surface to be cut. In addition, from the state where the cutting edge is in contact with the cutting surface to the state where the cutting edge bites into the cutting surface, the cutting depth of the cutting edge is continuously provided with at least one of the support portions as a fulcrum. A cutting tool characterized by adjustment. The cutting edge is composed of a ridge line formed by intersecting the rake face and the flank surface, and the function of cutting the cut surface is performed by moving the cutting edge toward the rake surface side while pushing the cutting edge into the machined surface. A cutting tool having a shape with a blunt angle at the tip or a chamfered shape with R processing at a position having a certain distance from the cutting edge on at least one side of the rake face side or the flank face side. A support portion capable of linearly or point-like contact with the surface to be cut is provided, the support portion has a thickness equal to or less than the width of the cutting edge, and the cutting edge is placed on the surface to be cut. When viewed from the pushing direction, the support portion is on a straight line in the direction of moving the cutting edge toward the rake face, and when cutting the cut surface, the cutting edge is in contact with the cut surface. A cutting tool characterized in that the cutting depth of the cutting edge is continuously adjusted with at least one of the supporting portions as a fulcrum until the cutting edge bites into the surface to be cut. The cutting tool according to claim 1 or 2 , wherein the rake face is selected from either a flat surface or a curved surface, and the flank surface is selected from either a flat surface or a curved surface. Claims 1 to 3 , wherein a recess having a width of 1 mm or more and a depth of 1 mm or more is provided between the cutting edge and the support portion provided on the rake face side. The cutting tool described in either. The cutting tool according to any one of claims 1 to 4 , wherein the tip of the support portion has a chamfered shape having an R of 0.3 mm or more. The angle formed by the normal of the rake face and the machined surface in a state where the straight line connecting the cutting edge and the tip of the support portion provided on the rake face side is arranged parallel to the machined surface is-. The cutting tool according to any one of claims 1 to 5 , wherein the cutting tool has a temperature of 10 ° or more.

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