JP5454594B2 - Grooving method - Google Patents

Description

  The present invention relates to a grooving method for forming a groove by cutting a metal member with a disk-type cutter.

  Since semiconductor devices and the like generate a large amount of heat during operation, they dissipate heat, for example, by installing a heat sink, thereby suppressing an increase in temperature. The heat sink includes, for example, a base member made of a metal member and plate-like fins arranged on the surface of the base member at substantially equal intervals. Since a groove is formed between adjacent fins, a semiconductor device or the like disposed on the base member can be suitably cooled by allowing a coolant such as air to pass through the groove. In recent years, with the reduction in size and weight of semiconductor devices and the like, heat sinks (fins) are also required to have high functionality, size reduction, and weight reduction.

  For example, as shown in Patent Document 1, a conventional heat sink is manufactured by fitting plate-like fins into grooves cut out on the surface of a base member. Further, for example, as shown in Patent Document 2, a rectangular parallelepiped metal member is manufactured by cutting a groove by cutting. Conventional heat sinks have also been manufactured by extrusion or die casting.

JP-A-6-315731 (see FIGS. 1 and 2) Japanese Patent Laying-Open No. 2005-228948 (see FIG. 1)

  In the manufacturing method of Patent Literature 1, there is a problem that the step of forming grooves on the base member and the step of fitting fins to the base member are complicated. If heat sinks are manufactured by extrusion molding or die casting, they can be manufactured relatively easily. However, if the fin length is reduced or the fin thickness is reduced, the product is reduced. There was a problem that the quality of the product deteriorated.

  Further, as in Patent Document 2, grooves can be formed relatively easily by cutting, and the fins can be made thinner and smaller. However, according to the cutting process, since the fin is a thin plate-like member, when the cutter is moved, the fin or the cutter vibrates and a burr is generated in the groove.

  That is, for example, when a metal member is cut with a disk-type cutter, the disk-type cutter vibrates most when the disk-type cutter is pressed against the metal member and cut. At this time, as the opening angle between the line connecting the rotation axis of the disk type cutter and one ridge line of the work piece block and the traveling direction line of the disk type cutter is larger, the force that presses the disk type cutter is more dispersed. The tip side of the disk-type cutter vibrates. When the disk-type cutter vibrates, it disturbs stable cutting, causing burrs in the grooves. If burrs are generated in the groove, it will hinder the passage of the refrigerant, which reduces the quality of the product.

  From such a viewpoint, an object of the present invention is to provide a grooving method for preventing the generation of burrs when forming a groove by cutting a metal member.

  A joining method according to the present invention that solves such a problem is a grooving that forms a plurality of grooves by moving a multi-cutter in which a plurality of disk-type cutters are stacked on a work block that exhibits a rectangular parallelepiped while rotating. It is a processing method, and a predetermined line of the work material block is set so that a straight line connecting one ridge line of the work material block and the rotation axis of the multi-cutter is parallel to a traveling direction of the disk cutter. And a first cutting step of moving the disk cutter from one ridge line toward the other ridge line.

  In this grooving method, when the disc type cutter is pressed against the work material block, the line connecting the rotation axis of the disc type cutter and the ridge line of the work material block is parallel to the traveling direction line of the disc type cutter. Therefore, the pressing force of the multi-cutter is transmitted intensively to the work material block, and the vibration of the disk-type cutter can be suppressed. Therefore, when the metal member is cut to form the groove, the generation of burrs can be prevented and the fins can be prevented from being lost.

  Further, the present invention provides a multi-cutter in which a plurality of disk-type cutters are stacked on a workpiece metal member having a workpiece block exhibiting a rectangular parallelepiped and a base member disposed on the bottom surface of the workpiece block. A grooving method for forming a plurality of grooves by moving while rotating, a straight line connecting one ridge line of the work material block and the rotation axis of the multi-cutter, and the traveling direction of the disk-type cutter And a first cutting step of moving the disc-shaped cutter from one ridge line to the other ridge line, and cutting the metal member to be cut to a predetermined depth so as to be parallel to each other. The depth of is characterized by being larger than the height of the work material block.

  In the grooving method, when a grooving process is performed on a metal member having a base member, when the disk cutter is pressed against the work material block, the rotation axis of the disk cutter and the work material Since the line connecting the ridge line of the block and the traveling direction line of the disk cutter are parallel, the pressing force of the multi-cutter is transmitted intensively to the work material block, and the vibration of the disk cutter can be suppressed. it can. Moreover, since the front end side of the disk type cutter bites into the base member, vibration on the front end side of the disk type cutter can be further suppressed. Thereby, the defect | deletion of a fin and generation | occurrence | production of a burr | flash can be prevented.

  Moreover, it is preferable after the said 1st cutting process to include the 2nd cutting process which moves the said disk type cutter toward one ridgeline from the other ridgeline.

  According to such a grooving method, the chips remaining in the groove can be easily removed by moving the disk cutter again to the groove formed in the first cutting step.

Further, the present invention is the work material block, a multi-cutter formed by laminating a plurality of disc-shaped cutter is moved while rotating a grooving process of forming a plurality of grooves, cutting the object exhibits a cuboid along one edge line of the wood block, as well as the shape formed an arcuate recess having a curvature equivalent to the disk-shaped cutter, connecting the rotary shaft of one of the virtual ridge line of said work material block and the multi-cutter line and, Ri Do the traveling direction of the disk-shaped cutter and parallel, and a line connecting the arc of the virtual center of one of the virtual ridge and the recess of the work material block, the traveling direction of the disc cutter DOO so is parallel, said a step cut cutting to a predetermined depth of the work material block, a first cutting step of moving toward the other edge line of the disk-shaped cutter from one virtual ridge, Characterized in that it contains.
Further, the present invention includes a work material block, a base member disposed on a bottom surface of the work material block, in the cutting metal member having, while rotating the multi-cutter formed by laminating a plurality of disc-shaped cutter the moved by a grooving method of forming a plurality of grooves, along one edge line of said work material blocks exhibiting a rectangular parallelepiped, the shape formed an arcuate recess having a curvature equivalent to the disk-shaped cutter as well as, the a straight line connecting the one of the virtual ridge of work material block and the axis of rotation of said multi-cutter, the traveling direction of the disk-shaped cutter Ri Do parallel, and one of said work material block a straight line connecting the virtual center of the arc of the virtual ridge line the recess, so that the traveling direction of the disk-shaped cutter is parallel, and the steps cut cutting to a predetermined depth of the object to be cut metallic member, the circular It includes a first cutting step of moving toward the mold cutter from one virtual ridge line to the other edge line, wherein the predetermined depth is characterized by the greater than the height of the work material block.

  According to this grooving method, the reaction force acting when the disk-type cutter is pressed against the work material block can be reduced, so that the vibration of the disk-type cutter can be prevented. Thereby, the defect | deletion of a fin and generation | occurrence | production of a burr | flash can be prevented.

  Moreover, it is preferable to have a spacer having a smaller radius than the disk-type cutter between the adjacent disk-type cutters.

  According to this grooving method, it is possible to prevent chips from entering between the stacked disk cutters. As a result, chips generated during cutting can be efficiently discharged to the outside, so that higher quality processing can be performed.

  According to the grooving method according to the present invention, it is possible to suppress the generation of burrs when forming a groove by cutting a metal member.

It is the perspective view which showed the heat sink formed by 1st embodiment which concerns on this invention. It is the figure which showed the multicutter used by 1st this embodiment which concerns on this invention, Comprising: (a) is a side view, (b) is an expanded sectional view in a cutter part, (c) is a disk type cutter. (D) is an enlarged view of the E part of (C). It is process drawing of 1st embodiment which concerns on this invention, Comprising: (a) is the perspective view which showed the arrangement | positioning process, (b) is a cutting process, (c) is a 1st cutting process, (d) is FIG. 6 is a side view showing the extraction process. It is the schematic diagram which showed the effect | action of 1st embodiment which concerns on this invention, Comprising: (a) shows the conventional cutting process, (b) shows the cutting process which concerns on 1st embodiment. It is a side view for demonstrating the extraction process of 1st embodiment which concerns on this invention. It is the side view which showed 3rd embodiment which concerns on this invention. It is the side view which showed 4th embodiment which concerns on this invention.

[First embodiment]
In the grooving method according to the present invention, a metal member is cut using a multi-cutter in which a plurality of disk-type cutters are stacked to form a groove. The grooving method can be employed when manufacturing various products. In the present embodiment, a case where a heat sink is manufactured by cutting a metal member to be cut will be described as an example.
Therefore, in the present embodiment, after explaining the heat sink manufactured by the grooving method and the multi-cutter, specific steps of the grooving method will be described.

FIG. 1 is a perspective view showing a heat sink formed according to the first embodiment of the present invention. FIG. 2 is a diagram showing a multi-cutter used in the first embodiment of the present invention, where (a) is a side view, (b) is an enlarged cross-sectional view of the cutter part, and (c) is a side view. The front view of a disk type cutter, (d) is an enlarged view of the blade part of a disk type cutter.
As shown in FIG. 1, a heat sink 1 manufactured by the grooving method according to the present embodiment includes a base member 2 made of a flat plate and fins 3 and 3 arranged in parallel on the surface of the base member 2 at substantially equal intervals. And so on. A groove 4 is formed between adjacent fins 3.

The base member 2 is a metal member made of a rectangular parallelepiped. For example, a semiconductor member is disposed on the back surface side, and is a member that transmits heat generated by the semiconductor member to the fin 3 side.
The fins 3 are flat metal members, and a plurality of fins 3 are arranged on the surface of the base member 2 at substantially equal intervals. Between the adjacent fins 3, a groove 4 is formed which continues in the longitudinal direction of the fins 3. When the refrigerant (air) passes through the grooves 4 formed by the plurality of fins 3, the heat transmitted to the base member 2 and the fins 3 can be released to the outside. That is, the larger the surface area of the fin 3, the larger the contact area with the refrigerant, so that the cooling effect can be enhanced. The height and thickness dimension of the fin 3, the width of the groove 4, and the like are appropriately set depending on the usage application of the heat sink 1.

  In the present embodiment, the base member 2 and the fins 3 are a single body, and are formed of, for example, an aluminum alloy. The material of the base member 2 and the fin 3 is not limited to this, and may be aluminum, copper, a copper alloy, titanium, a titanium alloy, magnesium, a magnesium alloy, or the like.

  In addition, on the surface of the base member 2 according to the present embodiment, recessed groove portions 5, 5,... The concave groove portion 5 is a concave groove formed when a disk-type cutter enters the base member 2 when performing a cutting process described later.

  As shown in FIGS. 2A and 2B, the multi-cutter 10 is a cutting tool having a shaft portion 11 and a cutter portion 16 including a plurality of disk-type cutters 14, 14. . The shaft portion 11 is a shaft member made of steel. A cutter portion 16 is installed on the outer periphery of the shaft portion 11, and a drive source (not shown) is connected to one end side of the shaft portion 11. In the multi-cutter 10, the cutter unit 16 rotates in the circumferential direction along with the rotation of the shaft unit 11 by the drive source, and cuts the metal member to be cut.

As shown in FIG. 2B, the cutter unit 16 is disposed between a plurality of disk-type cutters 14, 14... Arranged at equal intervals and the adjacent disk-type cutters 14, 14. And spacers 15, 15.
As shown in FIG. 2C, the disk cutter 14 includes an annular main body portion 14a and a blade portion 14b provided around the outer periphery of the main body portion 14a. The shaft portion 11 is fitted into the hollow portion 14 c formed at the center of the main body portion 14 a and integrated with the shaft portion 11. The blade portion 14b is a blade made of, for example, steel, and has a clearance angle and a rake angle of an angle α and an angle β, respectively, as shown in FIG. Here, the radius of the disk cutter 14 is R. Further, as shown in FIG. 2B, the thickness of the disk-type cutter 14 is K. That is, the width of the groove 4 of the heat sink 1 is determined by the thickness K of the disk cutter 14.

  In addition, what is necessary is just to set suitably the shape of a blade part 14b, a relief angle, a rake angle, etc. according to the raw material of the to-be-cut metal member 20, and the width | variety of the groove | channel 4. FIG. If the clearance angle α and the rake angle β are increased, the chips can be easily discharged to the outside.

As shown in FIG. 2 (b), the spacer 15 is interposed between the adjacent disk cutters 14, has an annular shape, and is fitted to the small diameter portion 11 b of the shaft portion 11. Yes. The spacer 15 is for arranging the disk-type cutters 14 at a desired interval, and for discharging the chips generated when the metal member to be cut is suitably cut out to the outside. That is, since the multi-cutter 10 is a device in which the disk-type cutters 14 are stacked, there is a concern that chips remain between the adjacent disk-type cutters 14 and 14. In particular, when chips are clogged on the axial center side, not only the removal operation of the chips becomes difficult, but also the life of the multi-cutter 10 is shortened. Further, if chips remain between the disk-type cutters 14 and 14 as described above, there is a possibility that the multi-cutter 10 is pressed against the metal member to be cut and cut.
However, as in the present embodiment, the spacer 15 is interposed, so that it is possible to prevent chips from being clogged in the gap between the adjacent disk cutters 14 and 14.

  Here, the thickness of the spacer 15 is J. The thickness of the fin 3 of the heat sink 1 is determined by the thickness J of the spacer 15. Further, the radius of the spacer 15 is S, and the portion obtained by subtracting the radius S of the spacer 15 from the radius R of the disk cutter 14 is T. T indicates a range in which the metal member to be cut can be cut by the disk-type cutter 14, and is hereinafter referred to as a maximum cutting length T. In the present embodiment, in order to cause the disk-type cutter 14 to bite into the base member 2 in the cutting process described later, the maximum cutting length T is formed to be larger than the height U of the work material block 21. .

  In the disk-type cutter 14, the vibration of the disk-type cutter 14 increases as the maximum cutting length T increases. Therefore, it is preferable to set the radius S of the spacer 15 large to prevent the disk-type cutter 14 from vibrating and to prevent clogging of chips. Further, the larger the width J of the spacer 15 is, the more clogging of the chips can be prevented, and the chips can be discharged to the outside of the disk type cutter 14 by centrifugal force.

  The multi-cutter 10 is formed as described above in the present embodiment, but is merely an example and is not limited thereto. The number of disk cutters 14, the thickness K, the thickness J of the spacer 15, etc. may be appropriately set according to the use of the heat sink 1.

  Next, the grooving method according to this embodiment will be described. 3A and 3B are process diagrams of the present embodiment, in which FIG. 3A is a perspective view illustrating an arrangement process, FIG. 3B is a cutting process, FIG. 3C is a first cutting process, and FIG. It is the side view which showed each extraction process.

  As shown in FIG. 3, the grooving method according to the present embodiment includes a multi-cutter arrangement step of arranging the multi-cutter 10 at a predetermined position, a cutting step of pressing the multi-cutter 10 against the metal member 20 to be cut, The first cutting step of moving the multi-cutter 10 from the ridge line 21a toward the other ridge line 21b and the extraction step of extracting the multi-cutter 10 from the metal member 20 to be cut are included.

  Here, a metal member cut by the multi-cutter 10 is a metal member 20 to be cut. The work metal member 20 includes a base member 2 having a plate shape and a work material block 21 having a surface area smaller than that of the base member 2 and having a rectangular parallelepiped shape. The work material block 21 is formed with a height U as shown in FIG. Of the four sides of the surface of the work material block 21, a pair of sides facing each other is defined as a first ridge line 21a and a second ridge line 21b. In the present embodiment, the metal member 20 to be cut is integrally formed, but may be formed by joining a plurality of members.

<Multi-cutter arrangement process>
In the multi-cutter arrangement step, as shown in FIG. 3A, the shaft portion 11 of the multi-cutter 10 and the first ridge line 21a are substantially parallel, and the rotation axis C of the multi-cutter 10 is the metal member 20 to be cut. It is the process of arrange | positioning the multi-cutter 10 so that it may be located on the vertical line M which passes along the 1st ridgeline 21a. Note that the metal member 20 to be cut is fixed in advance to a frame of a cutting device (not shown).

<Cutting process>
As shown in FIGS. 3 (a) and 3 (b), the cutting process is a process of moving the disk cutter 14 downward and moving the rotation axis C of the multi-cutter 10 downward along the vertical line M. It is. The cutting depth W in this embodiment is set so that the tip of the disk-type cutter 14 enters the base member 2. That is, the cutting depth W is set to be larger than the height U of the work material block 21. The cut depth W is set so that W <U when the groove 4 is to be formed shallowly.

<First cutting process>
In the first cutting step, as shown in FIGS. 3B and 3C, the multi-cutter 10 is moved from the first ridge line 21a to the second ridge line 21b in a substantially horizontal direction (the cutting depth W is constant). It is a process to make. The multi-cutter 10 is moved until the rotation axis C of the multi-cutter 10 reaches a vertical line M passing through the second ridge line 21b. In the present embodiment, the multi-cutter 10 is moved in a substantially horizontal direction, but it is not necessarily horizontal.

<Sampling process>
The extraction process is a process of extracting the multi-cutter 10 from the metal member 20 to be cut, as shown in FIGS. In the present embodiment, the multi-cutter 10 is moved upward along the vertical line M passing through the second ridge line 21 b, and the multi-cutter 10 is extracted from the metal member 20 to be cut. Through the above steps, the heat sink 1 shown in FIG. 1 is formed.

Here, the effect | action at the time of performing the grooving processing method which concerns on this embodiment is demonstrated.
4A and 4B are schematic diagrams showing the operation of the above-described cutting process, in which FIG. 4A shows a conventional cutting process, and FIG. 4B shows the cutting process according to the present embodiment. For example, as shown in (a) of FIG. 4, as a conventional cutting process, from the first ridge line 21 a to the second ridge line 21 b in a state where a constant cutting depth is maintained from the lateral direction of the work material block 21. The process of moving horizontally was performed.

  According to the conventional cutting process, the traveling direction line K1 of the multi-cutter 10 from the rotation axis C and the virtual line L1 connecting the rotation axis C and the first ridge line 21a of the work material block 21 are opened at an angle γ. Yes. Accordingly, when the multi-cutter 10 is pressed against the work material block 21, the pressing force is dispersed. Therefore, the larger the angle γ, the greater the vibration of the disk-type cutter 14 in the out-of-plane direction. When the disk cutter 14 vibrates in this way, there are problems that the fins 3 are chipped or burrs are generated in the grooves 4.

  On the other hand, according to the cutting process according to the present embodiment, as shown in FIG. 4B, the traveling direction line K2 of the multi-cutter 10 from the rotation axis C, the rotation axis C, and the work material block 21 An imaginary line L2 connecting the first ridge line 21a overlaps. Therefore, when the multi-cutter 10 is pressed against the work material block 21, the pressing force is concentrated, and therefore the vibration of the disk-type cutter 14 can be prevented. Thereby, the defect | deletion of the fin 3 and generation | occurrence | production of the burr | flash in the groove | channel 4 can be prevented.

  Further, when the work block 21 is cut with the multi-cutter 10, the pressing force is concentrated, so that the pressing force can be set small. Thereby, the lifetime of the disk type cutter 14 can be extended.

  Further, as shown in FIGS. 3B and 3C, according to the first cutting process according to the present embodiment, the cutting depth W is set to be larger than the height U of the work material block 21, The tip of the disk type cutter 14 can be bitten into the base member 2. Thereby, since the vibration of the front end side of the disk type cutter 14 can be prevented, generation | occurrence | production of a burr | flash can be prevented.

  FIG. 5 is a side view for explaining the extraction step according to the present embodiment. As shown in FIG. 5, according to the extraction step according to the present embodiment, the multi-cutter 10 can be separated at the shortest distance by extracting the multi-cutter 10 along the vertical line M. Here, an intersection 21c is defined as a point where the outer periphery of the disk cutter 14 and the upper surface of the work material block 21 intersect in a side view.

  That is, when the first cutting process is finished, the rotation axis C of the multi-cutter 10 is located on the vertical line M. At this time, since the rotation axis C of the multi-cutter 10 is not pushed below the upper surface of the work material block 21, the distance P from the second ridge line 21b to the intersection 21c and the cutting depth W are always set. P> W. Therefore, by pulling upward along the vertical line M, the multi-cutter 10 can be separated from the metal member 20 to be cut at the shortest distance. Therefore, when the multi-cutter 10 is pulled out, the fins 3 formed in the first cutting step and the disk-type cutter 14 can come into contact with each other to generate burrs, or prevent the fins 3 from being broken.

As mentioned above, although demonstrated in the best embodiment in this invention, this invention can be changed suitably in the range which is not contrary to the meaning of this invention. For example, in the first embodiment, the tip of the disk-type cutter 14 is bitten into the base member 2, but the first cutting step may be performed without biting. That is, the depth of the groove 4 may be appropriately set as necessary. Further, the grooving processing according to the present invention may be performed only on the work material block 21 without providing the base member 2.
Other embodiments of the present invention will be described below. In the description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the overlapping configuration is omitted.

[Second Embodiment]
The second embodiment according to the present invention is different from the first embodiment in that the second cutting step is performed after the first cutting step. The second cutting process will be described with reference to FIG.
The second cutting step is a step of moving the multi-cutter 10 horizontally (the cutting depth W is constant) from the second ridge line 21b side toward the first ridge line 21a side. And a 2nd cutting process is complete | finished in the stage in which the rotating shaft C of the disk type cutter 14 was located in the perpendicular line M of the 1st ridgeline 21a.

Thus, according to the second cutting process, the disk-type cutter 14 passes through the groove 4 formed by the first cutting process. Thereby, the chips remaining in the groove 4 can be discharged to the outside, and the burrs formed in the groove 4 can be cut and removed.
In addition, what is necessary is just to perform a extraction process, when a 2nd cutting process is complete | finished. Since the extraction process is substantially the same as the process according to the first embodiment, the description thereof is omitted.

[Third embodiment]
FIG. 6 is a side view showing a third embodiment according to the present invention. The cutting process according to the third embodiment is different from the first embodiment in that the disk cutter 14 is cut obliquely with respect to the metal member 20 to be cut. That is, in the cutting process according to the third embodiment, the disk-type cutter 14 may be cut at an angle σ during the cutting process. Thus, even if the disk-type cutter 14 is cut obliquely, the virtual line L3 connecting the first ridge line 21a from the rotation axis C of the disk-type cutter 14 and the traveling direction of the disk-type cutter 14 are made parallel. Can do. Thereby, since the force at the time of pressing the disk type cutter 14 can be concentrated, generation | occurrence | production of a burr | flash can be prevented. The angle σ is preferably in the range of 30 ° to 60 °.

[Fourth embodiment]
FIG. 7 is a side view showing a fourth embodiment according to the present invention. The fourth embodiment is different from the first embodiment in that a concave portion 30 having a circular arc shape in cross section is formed in advance along the virtual ridge line 26d of the work material block 21. In the fourth embodiment, the recess 30 is formed with a curvature substantially equal to the radius R of the disk-type cutter 14. Thereby, when the disk type cutter 14 is pressed against the work material block 21, the disk type cutter 14 makes a line contact with the concave portion 30, and therefore, the cutting can be suitably performed.

DESCRIPTION OF SYMBOLS 1 Heat sink 2 Base member 3 Fin 4 Groove 10 Multi cutter 14 Disc type cutter 15 Spacer 20 Metal member 21 Workpiece material block 21a First ridge line 21b Second ridge line

Claims (6)

A grooving method for forming a plurality of grooves by rotating a multi-cutter in which a plurality of disk-type cutters are stacked on a work material block exhibiting a rectangular parallelepiped,
Incising step of cutting to a predetermined depth of the work material block so that a straight line connecting one ridge line of the work material block and the rotation axis of the multi-cutter and a traveling direction of the disk cutter are parallel to each other When,
And a first cutting step of moving the disk-type cutter from one ridge line toward the other ridge line. A rotating multi-cutter in which a plurality of disk-type cutters are stacked on a metal member to be cut having a work block that has a rectangular parallelepiped shape and a base member disposed on the bottom surface of the work material block. A grooving method for forming a plurality of grooves,
A cutting step of cutting to a predetermined depth of the metal member to be cut so that a straight line connecting one ridge line of the work material block and the rotation axis of the multi-cutter and a traveling direction of the disk-type cutter are parallel to each other When,
A first cutting step of moving the disk-shaped cutter from one ridge line to the other ridge line, and
The grooving method according to claim 1, wherein the predetermined depth is larger than a height of the workpiece block. After the first cutting step,
The grooving method according to claim 1, further comprising a second cutting step of moving the disk-shaped cutter from the other ridge line toward the one ridge line. A grooving method for forming a plurality of grooves by rotating a multi-cutter in which a plurality of disk-type cutters are stacked on a work material block,
The exhibits rectangular along one edge line of the work material block, as well as the shape formed an arcuate recess having a curvature equivalent to the disk-shaped cutter,
A straight line connecting the rotational axis of one of the virtual ridge line and the multi-cutter of the work material block, Ri Do the traveling direction of the disk-shaped cutter and parallel, and, with one of the virtual ridge line of said work material block A cutting step of cutting to a predetermined depth of the work material block so that a straight line connecting the virtual center of the arc of the concave portion and the traveling direction of the disk-type cutter are parallel to each other ;
A first cutting step of moving the disk-type cutter from one virtual ridge line toward the other ridge line. A multi-cutter in which a multi-cutter, in which a plurality of disk-type cutters are stacked on a metal member to be cut, having a work material block and a base member disposed on the bottom surface of the work material block, is moved while rotating to form a plurality of grooves. A grooving method for forming
The exhibits rectangular along one edge line of the work material block, as well as the shape formed an arcuate recess having a curvature equivalent to the disk-shaped cutter,
A straight line connecting the rotational axis of one of the virtual ridge line and the multi-cutter of the work material block, Ri Do the traveling direction of the disk-shaped cutter and parallel, and, with one of the virtual ridge line of said work material block A cutting step of cutting to a predetermined depth of the metal member to be cut so that a straight line connecting the virtual center of the arc of the concave portion and the traveling direction of the disk-type cutter are parallel to each other ;
A first cutting step of moving the disk-shaped cutter from one virtual ridge line toward the other ridge line, and
The grooving method according to claim 1, wherein the predetermined depth is larger than a height of the workpiece block. Between the disk-shaped cutter adjacent grooving method according to any one of claims 1 to 5, characterized in that it has a spacer radius is smaller than the disk-shaped cutter.

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