JP5363193B2 - Cutting apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device and a cutting method for preventing the occurrence of a chattering mark inexpensively without imposing restrictions on cutting conditions and reducing cutting load. <P>SOLUTION: This cutting device is equipped with: a flat cutting tool (a first cutting tool) 3 moving relatively for an end face (a face to be cut) 2 of a shaft-like member to be cut 1 to cut the end face 2; and a flat cutting tool (a second cutting tool) 4 moving relatively for the end face 2 to cut the end face 2 to overlap it on at least a part of a cut part 2a cut by the flat cutting tool 3. These flat cutting tools 3, 4 are arranged in such a way that an angle of inclination &theta;1 of a cutting blade 3b for the direction of relative travel C1 of the cutting blade 3b and the end face 2 of the flat cutting tool 3 and an angle of inclination &theta;2 of a cutting blade 4b for the direction of relative travel of the cutting blade 4b and the end face 2 of the flat cutting tool 4 form a difference of angle &Delta;&theta; of 5&deg; or more for each other. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cutting apparatus and method for cutting a surface to be cut of a workpiece by relatively moving, for example, the workpiece and a cutting tool.

  In general, cutting using a cutting tool such as a flat bite or a hail bite is performed as a process for finishing the end face of the shaft-shaped workpiece with high accuracy and low surface roughness.

  By the way, when a cutting tool having a low rigidity is used as described above, the cutting load increases depending on the cutting conditions, and chatter vibration is generated in the cutting tool, which causes surface waviness on the cutting surface. Thus, a so-called chatter mark may be generated. For example, as shown in FIGS. 4A and 4B (where FIG. 4A is a front view and FIG. 4B is a right side view), an end surface 101 of a shaft-shaped workpiece 100 that rotates counterclockwise is represented by an end surface 101. When cutting with the flat cutting tool 102 sent in the direction of the white arrow toward the end, as shown by the solid line in FIG. 5, the radial chatter marks 103 are centered on the rotation center O of the axial workpiece 100 on the end face 101. May occur.

  The chatter mark 103 is formed by forming an uneven surface. When such a chatter mark is generated, not only the surface finish properties are deteriorated but also the cutting tool may be damaged. .

  Therefore, in order to prevent chatter marks, it is effective to reduce the cutting load so that chatter vibration does not occur in the cutting tool. It leads to reduction of. For this reason, in the cutting process as described above, development of a machining method that suppresses chatter vibration without reducing machining efficiency is expected.

  Therefore, conventionally, a method has been proposed in which chatter vibration is detected and another vibration that cancels the chatter vibration is applied to the cutting tool by a vibration device (see, for example, Patent Document 1).

JP 2005-305623 A

  By the way, the proposed method described above requires detection of chatter vibration and generation of another vibration that cancels the vibration, which makes the apparatus complicated and impractical and expensive. It was.

  In addition, research on the suppression of chatter vibration itself has been conducted in the past, and one of them proposes a method to calculate the machining speed at which chatter vibration is difficult to occur and perform machining at the speed based on the calculated value. However, this method has a disadvantage of limiting the cutting conditions.

  The present invention has been made to solve such problems of the prior art, and does not limit cutting conditions, reduce cutting load, and suppress chatter marks at low cost. It is an object of the present invention to provide a cutting apparatus and method that can be used.

A cutting apparatus according to claim 1 of the present invention is a first apparatus for cutting the surface to be cut by moving relative to a surface to be cut which is an end surface of a shaft-like material to be rotated about an axis . 1st cutting tool and the 2nd cutting which moves relatively with respect to the said to-be-cut object surface, and cuts the to-be-cut object surface so that it may overlap with at least one part of the cutting location cut by the said 1st cutting tool. The first cutting tool has a cutting edge that contacts the surface to be cut and cuts the surface to be cut, and the cutting edge faces the surface to be cut. Extending in a direction intersecting with the relative movement direction of the first cutting tool and the surface to be cut as viewed from the side, and the second cutting tool comes into contact with the surface to be cut and defines the surface to be cut. It has a cutting edge to be cut, and this cutting edge is in a direction facing the surface to be cut. The direction in which the cutting edge of the first cutting tool extends in the direction that intersects the direction of relative movement between the second cutting tool and the surface to be cut as viewed from the direction facing the surface to be cut. There the inclination angle of the cutting edge of the said first cutting Engineering tools is an angle formed by pairs the relative movement direction of the object-to-be-cut surface the first cutting tool, the direction opposite to the object-to-be-cut surface cutting the said direction of extension of the cutting edge of the second cutting tool is an angle formed by pairs the relative movement direction of the object-to-be-cut surface with its second cutting Engineering tools second cutting tool as viewed from The angle of inclination of the blade has an angle difference of 5 ° or more, and the cutting position of the cutting edge of the first cutting tool is cut by the cutting edge of the second cutting tool by the rotational drive of the workpiece. The angle difference between the cutting points by these two cutting edges when reaching the position Both cutting tools are arranged such that the direction in which the cutting edge of the first cutting tool extends and the direction in which the cutting edge of the second cutting tool extends are parallel to each other . It is characterized by that.

The cutting device according to claim 2 of the present invention cuts the surface to be cut by moving relative to the surface to be cut, which is a peripheral surface of a shaft-like material to be rotated about an axis. A second cutting tool that moves relative to the first cutting tool and the surface to be cut, and that cuts the surface to be cut so as to overlap at least a part of a cutting portion cut by the first cutting tool; A cutting tool, and the first cutting tool has a cutting edge that contacts the surface to be cut and cuts the surface to be cut, and the cutting edge faces the surface to be cut. Extending in a direction intersecting the relative movement direction of the first cutting tool and the surface to be cut as viewed from the direction, the second cutting tool comes into contact with the surface to be cut and the surface to be cut The cutting edge has a direction facing the surface to be cut. The direction in which the cutting edge of the first cutting tool extends in the direction that intersects the direction of relative movement between the second cutting tool and the surface to be cut as viewed from the direction facing the surface to be cut. Is an angle formed with respect to the relative movement direction between the first cutting tool and the surface to be cut, and the inclination angle of the cutting edge of the first cutting tool and the direction facing the surface to be cut. The inclination angle of the cutting edge of the second cutting tool, in which the extending direction of the cutting edge of the second cutting tool is an angle formed with respect to the relative movement direction between the second cutting tool and the surface to be cut. Have an angle difference of 5 ° or more, and the cutting position of the cutting edge of the first cutting tool has reached the cutting position of the cutting edge of the second cutting tool by the rotational drive of the workpiece. In some cases, the angle difference between the cutting points by the two cutting edges Both cutting tools are arranged so that the angle is 5 ° or more .

According to a third aspect of the present invention, there is provided a cutting method for cutting the surface to be cut by moving relative to a surface to be cut which is an end surface of a shaft-like material to be rotated about an axis. 2nd cutting which moves relative to 1 cutting tool and the said to-be-cut surface, and cuts the to-be-cut surface so that it may overlap with at least one part of the cutting location cut by the said 1st cutting tool. The first cutting tool and the second cutting tool each have a cutting edge that comes into contact with the surface to be cut and cuts the surface to be cut. The cutting edge of the first cutting tool extends in a direction intersecting the relative movement direction of the first cutting tool and the surface to be cut as viewed from the facing direction, and faces the surface to be cut. When the cutting edge of the second cutting tool is viewed from the direction of The first cutting tool extends in the direction intersecting the relative movement direction of the cutting tool and the surface to be cut, and the first cutting tool extends in the first direction when viewed from the direction facing the surface to be cut. The tilt angle of the cutting edge of the first cutting tool, which is an angle formed with respect to the relative movement direction between the cutting tool and the surface to be cut, and the second as viewed from the direction facing the surface to be cut. The inclination angle of the cutting edge of the second cutting tool, which is an angle formed by the direction in which the cutting edge of the cutting tool extends with respect to the relative movement direction of the second cutting tool and the surface to be cut, is mutually When the cutting position of the cutting edge of the first cutting tool reaches the cutting position of the cutting edge of the second cutting tool by the rotational drive of the workpiece, the angle difference of 5 ° or more. The angle difference between the cutting points by the cutting edge is 5 ° or more, and Both cutting tools are arranged such that the extending direction of the cutting edge of the first cutting tool and the extending direction of the cutting edge of the second cutting tool are parallel to each other when viewed from the direction facing the surface to be cut. It arrange | positions and cuts the said to-be-cut object surface, It is characterized by the above-mentioned .

A cutting method according to claim 4 of the present invention cuts the surface to be cut by moving relative to the surface to be cut, which is a peripheral surface of a shaft-like material to be rotated about an axis. A second cutting tool that moves relative to the surface to be cut and the surface to be cut so as to overlap with at least a part of a cutting portion cut by the first cutting tool. The first cutting tool and the second cutting tool each have a cutting edge that contacts the surface to be cut and cuts the surface to be cut, and the surface to be cut The cutting edge of the first cutting tool extends in a direction intersecting the relative movement direction of the first cutting tool and the surface to be cut as viewed from the direction opposite to the surface to be cut. When viewed from the opposite direction, the cutting edge of the second cutting tool is Extending in a direction crossing the direction of relative movement between the cutting tool the object-to-be-cut surface, the direction of extension of the cutting edge of the viewed from a direction opposite to the object-to-be-cut surface first cutting tool that first the look and inclination angle of the cutting edge of the first cutting tool the the cutting Engineering tool is an angle formed by pairs the relative movement direction of the object-to-be-cut surface of, from the direction opposite to the object-to-be-cut surface inclination angle of the cutting edge of the second cutting tool such second cutting tool extending direction of the cutting edge is an angle formed by pairs the relative movement direction of the object-to-be-cut surface with its second cutting Engineering tool Have an angle difference of 5 ° or more, and the cutting position of the cutting edge of the first cutting tool has reached the cutting position of the cutting edge of the second cutting tool by the rotational drive of the workpiece. In some cases, the angle difference between the cutting points by these two cutting edges is 5 ° or more. So as to place the two cutting tools, characterized by cutting the object-to-be-cut surface.

In the case of the cutting device according to claim 1 and the cutting method according to claim 3 , at least a part of the cutting portion on the surface to be cut by the first cutting tool (that is, cutting by the second cutting tool). In the state where the planned portion) has reached the cutting edge of the second cutting tool, an angle difference of 5 ° or more is generated between the cutting positions of both cutting edges. Therefore, the chatter mark formed by the first cutting tool and the chatter mark formed by the second cutting tool do not overlap in the same phase. That is, the concave stripes or the convex stripes of both chatter marks do not overlap on the same line segment (being in phase). Thereby, the uneven | corrugated state of a chatter mark is relieve | moderated and generation | occurrence | production of a chatter mark is suppressed. Therefore, in the present invention, it is only necessary to adjust the direction or the arrangement position of the first cutting tool and the second cutting tool, so there is no need to limit the cutting conditions or reduce the cutting load. In addition, since only a plurality of cutting tools are used, a large-scale apparatus is not required, and the cost can be reduced.

Further , according to the inventions of claims 1 and 3 , even if the cutting edges of the first and second cutting tools are installed in parallel, the end face of the shaft-like workpiece to be rotated around the axis is covered. Since it is a surface to be cut, when a cutting point formed by one cutting edge reaches the other cutting edge, the cutting points by both cutting edges have an angle difference of 5 ° or more.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the cutting apparatus which concerns on one Embodiment of this invention, (a) is the front view which looked at the rotating shaft-shaped workpiece from the outer side, (b) is the right view of (a). . It is a figure (right side view) for demonstrating the arrangement | positioning state of the two cutting tools shown in FIG. It is a figure which shows the generation | occurrence | production state of the chatter mark in the case of cutting with the cutting apparatus of FIG. It is a figure which shows the arrangement structure of the cutting tool in a prior art example, (a) is the front view which looked at the rotating shaft-shaped workpiece from the outer side, (b) is the right view of (a). It is a figure which shows the chatter mark generate | occur | produced in the prior art example.

  Embodiments of the present invention will be specifically described below.

  1A and 1B are diagrams showing a cutting device according to an embodiment of the present invention, in which FIG. 1A is a front view of a rotating shaft-shaped workpiece viewed from the outside, and FIG. 1B is a right side view of FIG. FIG. FIG. 2 is a diagram (right side view) for explaining an arrangement state of two cutting tools (bites).

  In the illustrated example of the cutting apparatus, an axial end surface 2 of a rotating shaft-shaped workpiece 1 having a circular cross section is a surface to be cut, and an annular groove is formed on the end surface 2 using two flat tools 3 and 4. The case of forming is given as an example. In addition, the to-be-cut material 1 is rotating counterclockwise in the example shown in FIG.

  The upper (upstream) flat bit 3 is the preceding one, and the lower (downstream) flat bit 4 is the following one. The flat cutting tool 3 and the flat cutting tool 4 are the same in size, rigidity and the like, and are used in the cutting apparatus so that the respective shaft centers 3a, 4a are at the same distance from the shaft center O of the shaft-shaped workpiece 1. It is attached to the chuck 10 provided. The chuck 10 sends flat cutting tools 3 and 4 in the direction of white arrows. Each of the cutting edges 3b, 4b of the flat cutting tool 3, 4 is formed substantially linearly, and the cutting edge 4b of the lower flat cutting tool 4 is located along the radial direction of the axial workpiece 1; The cutting edge 3b of the upper flat cutting tool 3 is arranged in parallel with the cutting edge 4b. Each of these cutting edges 3b and 4b cuts substantially the same annular region A (region sandwiched by two broken lines) of the end face 2 and forms the annular groove in the region A. Further, the leading flat bit 3 and the following flat bit 4 have an inclination angle θ1 of the cutting edge 3b with respect to the relative movement direction C1 between the cutting edge 3b of the flat cutting bit 3 and the end face 2, and the cutting edge 4b of the flat cutting bit 4 The inclination angle θ2 of the cutting edge 4b with respect to the relative movement direction C2 with respect to the end face 2 is arranged to have an angle difference Δθ of 5 ° or more. In other words, when the cutting portion 2a (shown by a broken line in FIG. 2) formed on the end surface 2 by the cutting edge 3b of the preceding flat cutting tool 3 reaches the cutting edge 4b of the succeeding flat cutting tool 4, A relative angle difference Δθ formed between the cutting portion 2b (shown by a two-dot chain line in FIG. 2) and the cutting portion 2a (shown by a broken line) formed on the end surface 2 by the blade 4b or the cutting edge 4b. It arrange | positions so that it may become 5 degrees or more. The relative movement directions C1 and C2 are the tangential directions of the cutting edges 3b and 4b because the workpiece 1 rotates around the axis O, and are at the center positions of the cutting edges 3b and 4b. It is said.

  Next, the reason why the relative angle difference Δθ between the cutting part 2b and the cutting part 2a is set to 5 ° or more as described above will be described.

  Table 1 shows that the relative angular difference Δθ between the cutting portion 2b and the cutting portion 2a is changed by changing the arrangement positions of the upper and lower cutting tools 3 and 4, and the effective angular difference for suppressing chatter vibration. It is the table | surface summarized about the result of having investigated (DELTA) (theta). In the table, ○ indicates that the chatter mark is present but the uneven state is relaxed and the surface property is improved, Δ indicates that the uneven state is not changed, and the surface property is not significantly changed, and × indicates the uneven Represents a state in which the surface properties are deteriorated due to the remarkable state. Moreover, the end surface 2 was processed with the flat cutting tools 3 and 4 made from high-speed tool steel, using S45C material with a diameter of 300 mm as the shaft-shaped workpiece 1. The cutting speed was 100 m / min, the feed rate was 0.02 mm / tooth, the cutting width was 20 mm, and water-soluble cutting oil (EC50 manufactured by Yushiro Chemical Co., Ltd.) was diluted to 5% and used.

  As can be seen from Table 1, when the angle difference Δθ is 0 ° to 2 °, the surface properties are poor, and when the angle difference Δθ is 3 ° and 4 °, there is no significant change in the surface properties. When the difference Δθ is 5 ° or more, the surface properties become good. In addition, although it confirmed also on cutting conditions other than the above, similarly, the angle difference (DELTA) (theta) was 5 degrees or more, and the surface property was favorable.

  Based on the above results, in the present invention, it is defined that the two flat cutting tools 3 and 4 are arranged so that the angle difference Δθ is 5 ° or more.

  By the way, the reason why the surface property is good when the angle difference Δθ is 5 ° or more is considered as follows.

  That is, in a state where the cutting portion formed by the flat cutting tool 3 reaches the cutting edge 4b of the flat cutting tool 4, an angle difference Δθ of 5 ° or more is generated between the cutting positions by both the cutting blades 3b and 4b. Therefore, as shown in FIG. 3, the chatter mark 5 formed by the flat cutting tool 3 and the chatter mark 6 formed by the flat cutting tool 4 are relatively shifted by the angle difference Δθ and do not overlap in the same phase. In other words, even if the concave stripes of both chatter marks 5 and 6 or the convex stripes overlap in a spot manner, the concave stripes of both chatter marks 5 and 6 or the entire convex stripes overlap at the same time on the same line segment. (Same phase). As a result, the uneven state of the chatter mark is relaxed, that is, a vibration phenomenon excited by the chatter mark affecting the cutting process at the next rotation (for example, increasing or decreasing the cutting amount from a predetermined value). This is because the self-excited chatter vibration is difficult to be excited.

  Therefore, the cutting apparatus according to the present embodiment employs an arrangement structure in which the two flat cutting tools 3 and 4 are arranged so that the aforementioned angle difference Δθ is 5 ° or more. And when it is based on the cutting method by this cutting device, it becomes possible to make the surface property of a cutting location favorable. Therefore, in this embodiment, since it is only necessary to adjust the inclination of each of the cutting tools 3 and 4 on the upstream side and the downstream side in the machining direction, it is not necessary to limit the cutting conditions or reduce the cutting load. Since it is only necessary to use two bytes at the same time, a large-scale device is not required and the cost can be reduced. Furthermore, the size of chatter vibration generated in the cutting tools 3 and 4 is reduced by improving the surface property of the cutting portion. This makes it easier to prevent tool breakage that may occur when cutting with a single cutting tool 102 as shown in FIG.

  In the above-described embodiment, the flat cutting tools 3 and 4 are arranged so that the flat cutting tools 3 and 4 pass through the same annular area A, but the present invention is not limited to this. For example, it may be configured such that a part of the portion cut by the flat cutting tool 3 reaches the cutting edge 4b of the flat cutting tool 4. That is, if there is an annular region cut by both the flat tool 3 and the flat tool 4, the effect of the present invention can be obtained in the annular region.

  Moreover, although embodiment mentioned above demonstrated about the case where an annular groove is formed in the end surface 2 of the shaft-shaped workpiece 1, this invention is not limited to this. For example, the present invention can also be applied in the same manner when processing the peripheral surface of the shaft-shaped workpiece 1 to have a low surface roughness with small unevenness or when forming a groove around the peripheral surface on the peripheral surface. In this case as well, as before, when the cutting part by the cutting tool arranged on the upstream side in the rotation direction of the shaft-shaped workpiece 1 reaches the cutting position of the cutting tool arranged on the downstream side in the rotation direction, the rotation is performed. The arrangement of both the cutting tools is determined so that the relative angle difference Δθ between the cutting portion by the cutting tool on the downstream side in the direction and the cutting portion that has reached is 5 ° or more. In other words, in this case, unlike the above-described embodiment, the cutting edges 3b and 4b of both tools are not parallel to each other. However, when machining the peripheral surface of the shaft-shaped workpiece 1, the cutting tool in which the cutting edge is arranged in parallel with the shaft center of the shaft-shaped workpiece 1 may be linear, but the shaft The cutting tool that is inclined obliquely with respect to the axis of the workpiece 1 needs to have a curved cutting edge with both ends projecting outward and the center is recessed. When both the two cutting tools are inclined obliquely with respect to the axial center of the shaft-shaped workpiece 1, it is necessary to use a cutting tool whose cutting edge has the curved shape.

  Furthermore, the present invention can also be applied to the case of performing groove processing on a flat surface, or processing to finish the flat surface with low surface roughness.

Furthermore, in the embodiment described above, the cutting tool side is fixed and the workpiece side is moved (including rotation). However, as a reference example , the cutting tool side is moved (including rotation) and the workpiece is moved. it is also possible to adopt a configuration for fixing the cutting material side. When moving the cutting tool side, it is preferable to move the chuck to which two or three or more cutting tools are attached. The reason is that it is easy to keep the positional relationship between the bits attached to the chuck in a constant state. However, when the chuck is moved, the configuration may be such that the positional relationship and angular relationship of the cutting tool are adjusted. In the case of this configuration, for example, as shown in FIG. 1, the chuck 10 is slid from a position at which the left end on the horizontal plane B of the end face 2 is cut with a cutting tool 3, 4 to a position at which the axis O is cut. It is possible to finish the entire surface of 2 with a low surface roughness.

  In the embodiment described above, the case where two cutting tools are arranged along the rotation direction is given as an example. However, the present invention is not limited to this, and three or more cutting tools are arranged along the rotation direction. The same can be applied to the case. In short, the relative angle difference Δθ may be set to 5 ° or more between two successive bits in the rotation direction. In this case, it is not necessary to target all bytes, and it may be applied to at least two bytes.

  Furthermore, in the above-described embodiment, an example in which a flat cutting tool is used as a cutting tool has been described. However, the present invention is not limited to this, and the same applies to the case of using another cutting tool such as a hail cutting tool. Applicable. In short, it can be applied to a wide range of cutting tools that perform grooving and finishing to low surface roughness.

1 Material to be cut 2 End face (surface to be cut)
2a Cutting part 2b Cutting part 3, 4 Flat tool 3b, 4b Cutting edge 5, 6 Chatter mark Δθ Relative angle difference between two cutting parts

Claims (4)

A first cutting tool that moves relative to a surface to be cut that is an end surface of a shaft-like material to be rotated about an axis, and cuts the surface to be cut;
A second cutting tool that moves relative to the surface to be cut and cuts the surface to be cut so as to overlap with at least a part of the cutting site cut by the first cutting tool;
The first cutting tool has a cutting edge that comes into contact with the surface to be cut and cuts the surface to be cut, and the cutting edge is viewed from a direction facing the surface to be cut. Extending in a direction intersecting the relative movement direction of the cutting tool 1 and the surface to be cut;
The second cutting tool has a cutting edge that comes into contact with the surface to be cut and cuts the surface to be cut, and the cutting edge is viewed from a direction facing the surface to be cut. Extending in a direction intersecting the relative movement direction of the cutting tool 2 and the surface to be cut;
In the angle formed by pairs the relative movement direction to the direction said object-to-be-cut surface with its first cutting engineering tools of extension of the cutting edge of the viewed from a direction opposite to the object-to-be-cut surface first cutting tool wherein the inclination angle of the cutting edge of a said first cutting tool, the direction of extension of the cutting edge of the viewed from a direction opposite to the object-to-be-cut surface the second cutting tool and its second cutting Engineering tools be the inclination angle of the cutting edge of the second cutting tool in the relative movement direction is an angle formed by the pair of the cutting target surface, and having an angular difference of 5 ° or more from each other, cutting the first cutting tool When the cutting location by the blade reaches the cutting position of the cutting edge of the second cutting tool by the rotational drive of the workpiece, the angular difference between the cutting locations by both the cutting edges is 5 ° or more, and The first cutting tool as viewed from the direction facing the surface to be cut Both cutting tools are arrange | positioned so that the direction where the cutting blade extends and the direction where the cutting blade of the second cutting tool extends may be parallel to each other . A first cutting tool that moves relative to a surface to be cut that is a peripheral surface of a shaft-like material to be rotated about an axis, and cuts the surface to be cut;
A second cutting tool that moves relative to the surface to be cut and cuts the surface to be cut so as to overlap with at least a part of the cutting site cut by the first cutting tool;
The first cutting tool has a cutting edge that comes into contact with the surface to be cut and cuts the surface to be cut, and the cutting edge is viewed from a direction facing the surface to be cut. Extending in a direction intersecting the relative movement direction of the cutting tool 1 and the surface to be cut;
The second cutting tool has a cutting edge that comes into contact with the surface to be cut and cuts the surface to be cut, and the cutting edge is viewed from a direction facing the surface to be cut. Extending in a direction intersecting the relative movement direction of the cutting tool 2 and the surface to be cut;
The extending direction of the cutting edge of the first cutting tool as viewed from the direction facing the surface to be cut is an angle formed by the relative movement direction of the first cutting tool and the surface to be cut. The inclination angle of the cutting edge of the first cutting tool and the direction in which the cutting edge of the second cutting tool extends when viewed from the direction facing the surface to be cut are the second cutting tool and the surface to be cut. And the inclination angle of the cutting edge of the second cutting tool, which is an angle formed with respect to the relative movement direction with respect to each other, has an angle difference of 5 ° or more with respect to each other, and a cutting location by the cutting edge of the first cutting tool When the cutting tool reaches the cutting position of the cutting edge of the second cutting tool by the rotational drive of the workpiece , both cutting tools are set so that the angle difference between the cutting positions of both cutting edges is 5 ° or more. A cutting apparatus characterized by being arranged. A first cutting tool that moves relative to a surface to be cut that is an end surface of a shaft-like material to be rotated about an axis, and cuts the surface to be cut;
Using a second cutting tool that moves relative to the surface to be cut and cuts the surface to be cut so as to overlap at least a part of a cutting portion cut by the first cutting tool,
The first cutting tool and the second cutting tool each have a cutting edge that contacts the surface to be cut and cuts the surface to be cut.
The cutting edge of the first cutting tool extends in a direction intersecting the relative movement direction of the first cutting tool and the surface to be cut as viewed from the direction facing the surface to be cut, and The cutting edge of the second cutting tool extends in a direction intersecting the relative movement direction of the second cutting tool and the surface to be cut as viewed from the direction facing the surface to be cut, and the cutting target the direction of extension of the cutting edge of the viewed from a direction opposite to the target surface a first cutting tool is an angle formed by pairs the relative movement direction of the object-to-be-cut surface with its first cutting Engineering tool first the inclination angle of the cutting edge of one cutting tool, the object-to-be-cut surface direction and its second cutting engineering tools of extension of the cutting edge of the viewed from a direction opposite to the object-to-be-cut surface the second cutting tool an angle formed by pairs the relative movement direction that of the second cutting tool Re the inclination angle of the blade, have a angle difference of 5 ° or greater with respect to one another, the cutting position by the cutting edge of the first cutting tool cutting edge of the second cutting tool by the rotation of the object cutting material When the cutting position is reached, the angle difference between the cutting points by the two cutting edges is 5 ° or more, and the direction in which the cutting edge of the first cutting tool extends is viewed from the direction facing the surface to be cut. A cutting method, wherein both cutting tools are arranged so that a cutting edge of the second cutting tool extends in parallel to each other, and the surface to be cut is cut.   A first cutting tool that moves relative to a surface to be cut that is a peripheral surface of a shaft-like material to be rotated about an axis, and cuts the surface to be cut;
  Using a second cutting tool that moves relative to the surface to be cut and cuts the surface to be cut so as to overlap at least a part of a cutting portion cut by the first cutting tool,
  The first cutting tool and the second cutting tool each have a cutting edge that contacts the surface to be cut and cuts the surface to be cut.
  The cutting edge of the first cutting tool extends in a direction intersecting the relative movement direction of the first cutting tool and the surface to be cut as viewed from the direction facing the surface to be cut, and The cutting edge of the second cutting tool extends in a direction intersecting the relative movement direction of the second cutting tool and the surface to be cut as viewed from the direction facing the surface to be cut, and the cutting target The first direction in which the extending direction of the cutting edge of the first cutting tool as viewed from the direction facing the target surface is an angle formed with respect to the relative movement direction between the first cutting tool and the target surface to be cut. The inclination angle of the cutting edge of the cutting tool and the extending direction of the cutting edge of the second cutting tool as viewed from the direction facing the surface to be cut are relative to the second cutting tool and the surface to be cut. Of the second cutting tool, which is an angle formed with respect to the moving direction. The tilt angle of the cutting blade has an angle difference of 5 ° or more, and the cutting position of the cutting blade of the first cutting tool is driven by the rotational drive of the work material to the cutting edge of the second cutting tool. A cutting method comprising: arranging both cutting tools so that an angle difference between cutting portions by the two cutting edges is 5 ° or more when the cutting position is reached, and cutting the surface to be cut.

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