JP2015116613A - Grooving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grooving method capable of flattening a metallic member and of obtaining favorable operationality of a multi-cutter, when cutting the metallic member to form a groove.SOLUTION: There is provided a grooving method including forming a plurality of grooves on a block 21 of a metallic material to be cut by moving a multi-cutter 10 which is formed by stacking a plurality of disk cutters 14, while rotating. The method includes: a preparation process of fixing the block 21 to a table K so that a surface 21c of the block 21 becomes a convex shape; and a cutting process of forming a plurality of fins on the upper side of the block 21 by the multi-cutter 10. In the cutting process, cutting is performed in such a state that a tensile stress acts on the surface 21c of the block 21 by a bending moment acting on the block 21.

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, the temperature rise is suppressed by radiating heat through, for example, a heat sink. The heat sink includes, for example, a base member made of a metal member and plate-like fins arranged in parallel 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 be reduced in size and weight.

  As a conventional heat sink manufacturing method, for example, Patent Document 1 discloses a method of fitting plate-like fins into grooves cut out on the surface of a base member. Patent Document 2 discloses a method of manufacturing a heat sink by forming a groove in a metal member having a rectangular parallelepiped shape by cutting. In addition, as a conventional heat sink manufacturing method, a method by extrusion molding or die casting is known.

JP-A-6-315731 JP 2005-228948 A

  In the manufacturing method of Patent Document 1, the step of forming grooves on the base member and the step of fitting fins onto the base member are complicated. In addition, when heat sinks are manufactured by extrusion molding or die casting, they can be manufactured relatively easily, but they are not suitable for miniaturization, and there is a problem that the quality of the product decreases if the fin length or thickness is reduced. there were.

  According to the method of Patent Document 2, the grooves can be formed relatively easily, and the fins can be made thinner and smaller. However, for example, when cutting is performed with a multi-cutter having a plurality of disc-type cutters, the disc-type cutter is sandwiched between the formed fins, and thus the operability of the multi-cutter is reduced. In addition, since frictional heat is generated between the disk-shaped cutter and the metal member, there is a problem that the surface side of the metal member may be deformed into a concave shape due to thermal contraction after the cutting process is completed.

  From this point of view, the present invention provides a grooving method in which when a metal member is cut to form a groove, the metal member becomes flat and the operability of the multi-cutter is improved. Let it be an issue.

  In the grooving method according to the present invention for solving such a problem, a multi-cutter in which a plurality of disk-type cutters are stacked is moved and rotated on a metal work material block to form a plurality of grooves. A grooving method, comprising: a preparatory step of fixing the work material block to a table so that the surface of the work material block is convex; and a plurality of cutters on the front side of the work material block with the multi-cutter A cutting step of forming fins, wherein in the cutting step, cutting is performed in a state where tensile stress is applied to the surface of the work material block by a bending moment acting on the work material block. .

  According to this method, since the cutting process is performed in a state where the tensile stress is applied so that the surface side of the work material block becomes convex, the work material is caused by thermal shrinkage that occurs so that the surface side becomes concave after the cutting process. The block can be flattened. Moreover, since the surface side of the work material block has a convex shape, the disk-type cutter is less likely to be sandwiched between fins formed by cutting. Thereby, the operativity of a multi cutter becomes favorable.

  Moreover, along the one ridge line of the work material block exhibiting a rectangular parallelepiped, a concave portion forming step for forming an arc-shaped concave portion having the same radius as the disk-type cutter, and a virtual ridge line corresponding to the one ridge line, The straight line connecting the rotation axis of the disk-type cutter and the traveling direction of the disk-type cutter are parallel, and the straight line connecting the virtual ridge line of the work material block and the center of the arc of the recess, A cutting step of cutting to a predetermined depth of the work material block so that the traveling direction of the disk-type cutter is parallel, and in the cutting step, the disk-type cutter is moved from the virtual ridge line to the other ridge line. It is preferable to move it toward.

When the metal member is cut with the disk-type cutter, the disk-type cutter vibrates most when the disk-type cutter is pressed against the metal member and cut (immediately after starting cutting). At this time, the greater the opening angle between the line connecting the rotation axis of the disk cutter and one ridge line of the work piece block and the traveling direction line of the disk cutter, the greater the vibration of the disk cutter. If the disk cutter vibrates greatly, there is a risk that the amount of burrs generated during cutting will increase. When many burrs are generated in the groove, it is an obstacle to the passage of the refrigerant, so that the quality of the product is lowered.
However, according to the configuration of the present invention, the pressing force of the disk-type cutter can be concentrated, and the outer peripheral edge of the disk-type cutter comes into uniform contact with the arc-shaped concave portion. As a result, burrs generated in the grooves can be reduced.

  In the preparation step, it is preferable that the work material block is fixed in a state where a spacer is sandwiched between the front surface of the table and the back surface of the work material block. With this method, it is possible to easily form a state in which the surface side of the work material block is convex.

  Moreover, it is preferable to include the burr cutting process which cuts the burr | flash produced by the said cutting process from the said work material block. According to such a method, the formed product can be finished finely.

  The present invention also provides a multi-cutter, in which a multi-cutter, in which a plurality of disk-type cutters are stacked, is moved while rotating 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. In the grooving method for forming a plurality of grooves, an exposed portion exposed around the work material block is formed on the surface of the base member, and the surface of the work material block is convex. A cutting step of forming a plurality of fins on the front side of the workpiece block with the multi-cutter, and a step of fixing the metal member to be cut to a table so as to be in a shape, Cutting is performed in a state in which tensile stress is applied to the surface of the workpiece block by a bending moment acting on the metal member to be cut.

  According to this method, since the cutting process is performed in a state where the tensile stress is applied so that the surface side of the work material block becomes convex, the metal to be cut by heat shrinkage that occurs so that the surface side becomes concave after the cutting process. The member can be flattened. Moreover, since the surface side of the work material block has a convex shape, the disk-type cutter is less likely to be sandwiched between fins formed by cutting. Thereby, the operativity of a multi cutter becomes favorable.

  Further, along one ridge line of the workpiece block exhibiting a rectangular parallelepiped, a recess forming step for forming an arc-shaped recess having a radius equivalent to that of the disk cutter, and one ridge line of the workpiece block A straight line connecting the corresponding virtual ridge line and the rotation axis of the disk-type cutter is parallel to the traveling direction of the disk-type cutter, and the virtual ridge line of the work material block and the center of the arc of the concave portion A cutting step of cutting to a predetermined depth of the metal member to be cut so that a straight line to be connected and a traveling direction of the disc type cutter are parallel to each other, and in the cutting step, the disc type cutter is moved to the virtual ridgeline. It is preferable to move toward the other ridge line.

  According to this method, the pressing force of the disk-type cutter can be concentrated on the concave portion, and the outer peripheral edge of the disk-type cutter uniformly contacts the arc-shaped concave portion. Thereby, since the vibration of a disk type cutter can be suppressed, the burr | flash which generate | occur | produces in a groove | channel can be reduced.

  In the preparation step, the metal member to be cut is preferably fixed in a state where a spacer is sandwiched between the front surface of the table and the back surface of the base member. With this method, the metal member to be cut can be easily fixed to the table in a state where the surface side of the work material block is convex.

  Moreover, it is preferable to include the burr cutting process which cuts the burr | flash produced by the said cutting process from the said to-be-cut metal member. According to such a method, the formed product can be finished finely.

  According to the grooving method according to the present invention, when a metal member is cut to form a groove, the metal member becomes flat and the operability of the multi-cutter is improved.

It is a perspective view which shows the heat sink formed by 1st embodiment which concerns on this invention. It is a figure which shows the multi-cutter 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 It is a front view of a disk type cutter, and (d) is an enlarged view of E portion of (c). It is a perspective view which shows the table and metal member to be cut | disconnected of 1st embodiment which concerns on this invention. It is a perspective view which shows the preparatory process of 1st embodiment which concerns on this invention. It is process drawing of 1st embodiment which concerns on this invention, Comprising: (a) is a cutting process, (b) is a 1st cutting process, (c) is a side view which each showed 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. Here, after explaining the heat sink manufactured by the grooving method and the multi-cutter, specific steps of the grooving method will be described.

  As shown in FIG. 1, the heat sink 1 manufactured by the grooving method according to this embodiment includes a base member 2 and fins 3, 3... Arranged in parallel on the surface of the base member 2 at substantially equal intervals. And have. 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.

  Note that, on the surface of the base member 2 according to the present embodiment, a plurality of concave groove portions 5 are formed on both ends of the groove 4. 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. 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 driving source, and cuts a metal member to be cut which will be described later.

  As shown in FIG. 2B, the cutter unit 16 includes a plurality of disk-type cutters 14 arranged at equal intervals and an intermediate member 15 arranged between the adjacent disk-type cutters 14 and 14. Have. As shown in FIG. 2C, the disk cutter 14 has an annular main body 14a and a blade 14b provided around the outer periphery of the main body 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. The width of the groove 4 of the heat sink 1 is determined by the thickness F 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 metal member to be cut later mentioned, and the width | variety of the groove | channel 4. 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. 2B, the intermediate member 15 is interposed between adjacent disk cutters 14 and has an annular shape and is fitted to the shaft portion 11. The intermediate member 15 is for disposing the disk-shaped 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 possibility 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. Moreover, when chips remain between the disk-type cutters 14 and 14, 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 intermediate member 15 is interposed, so that it is possible to prevent chips from clogging in the gaps between the adjacent disk cutters 14 and 14.

  The thickness of the fin 3 of the heat sink 1 is determined by the thickness J of the intermediate member 15. Further, T is a portion obtained by subtracting the radius S of the intermediate member 15 from the radius R of the disk cutter 14. 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. (See (a) of FIG. 5).

  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 intermediate member 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 intermediate member 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 the disk-type cutters 14, the maximum cutting length T, the thickness F, the thickness J of the intermediate member 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. First, the table K used in the grooving method and the metal member 20 to be cut which is a member to be cut will be described. As shown in FIG. 3, the table K includes a substrate K1, a spacer K2, and a plurality of clamps K3.

  The substrate K1 is a plate-like member having a flat surface. The spacer K2 is a member disposed on the central surface of the substrate K1, and has a rectangular parallelepiped shape. The spacer K2 is a member disposed between the substrate K1 and the metal member 20 to be cut which will be described later. The clamp K3 is a member that fixes the peripheral edge of the metal member 20 to be cut to the substrate K1. In the present embodiment, eight clamps K3 are provided, but the number of clamps K3 is appropriately set depending on the size and shape of the metal member 20 to be cut.

  The spacer K2 may be integral with or separate from the substrate K1. In addition, other shapes of spacers may be used as long as the metal member 20 to be cut can be fixed to the table K so as to be convex upward. Further, the surface (upper surface) of the substrate K1 may be formed in a convex shape without providing a spacer.

  As shown in FIG. 3, the metal workpiece 20 includes a base member 2 that has a rectangular parallelepiped shape and a work material block 21 that is formed smaller than the base member 2 and has a rectangular parallelepiped shape. Of the four sides of the surface (upper surface) 21c of the work material block 21, a pair of sides facing the longitudinal direction of the metal member 20 to be cut are defined as a first ridge line 21a and a second ridge line 21b. In addition, a pair of sides facing in the short direction are defined as a third ridge line 21d and a fourth ridge line 21e.

  On the surface 2 c of the base member 2, an exposed portion having a rectangular frame shape in plan view exposed around the work material block 21 is formed. In the present embodiment, the metal member 20 to be cut is formed integrally, but may be formed by joining a plurality of members. In addition, the shape of the metal member 20 to be cut may be appropriately determined according to the use application of the heat sink 1.

  The grooving method according to the present embodiment includes a preparation process, a multi-cutter arrangement process, a cutting process, a first cutting process (cutting process), a sampling process, and a burr cutting process.

  The preparation process is a process of fixing the metal member 20 to be cut to the table K. As shown in FIGS. 3 and 4, in the preparation step, the metal member 20 to be cut is disposed on the spacer K2, and the periphery of the base member 2 is fixed by the clamp K3. Specifically, the first ridge line 21a and the second ridge line 21b are convex upward, and the third ridge line 21d and the fourth ridge line 21e are fixed so as to be straight lines. That is, it fixes so that the line | wire which tied the highest position among the surfaces 21c and the advancing direction of the multi cutter 10 in the 1st cutting process mentioned later may become substantially parallel. When the metal member 20 to be cut is fixed to the table K, the metal member 20 to be cut is fixed so as to be convex upward. At this time, a tensile stress is applied to the surface 21c due to a bending moment acting on the metal member 20 to be cut.

  The multi-cutter arrangement process is a process of arranging the multi-cutter 10 at a predetermined position as shown in FIG. In the multi-cutter arrangement process, the shaft 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 on the vertical line M passing through the first ridge line 21a of the metal member 20 to be cut. The multi-cutter 10 is disposed so as to be positioned at the position.

  The cutting process is a process of inserting the multi-cutter 10 into the metal member 20 to be cut. As shown in FIG. 5A, in the cutting process, the rotary cutter C is moved downward along the vertical line M while rotating the disk cutter 14. The cutting depth W in the present embodiment is set such that the outer peripheral edge of the disk 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.

  The first cutting step is a step of moving the multi-cutter 10 from the first ridge line 21a toward the second ridge line 21b. As shown in FIG. 5B, in the first cutting step, 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). 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.

  The extraction process is a process of extracting the multi-cutter 10 from the metal member 20 to be cut. As shown in FIG. 5C, in the extraction step, the multi-cutter 10 is moved upward along the vertical line M passing through the second ridge line 21b, and the multi-cutter 10 is extracted from the metal member 20 to be cut. .

  The burr cutting step is a step of cutting a burr generated on the metal member 20 to be cut by the cutting process, the first cutting process, and the extraction process. 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.
6A and 6B are schematic diagrams showing the operation of the above-described cutting process, in which FIG. 6A shows a conventional cutting process, and FIG. 6B shows a cutting process according to the present embodiment. For example, as shown in (a) of FIG. 6, as a conventional cutting process, from the first ridge line 21 a to the second ridge line 21 b in a state in which 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 such a conventional cutting process, the traveling direction line D1 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-type cutter 14 vibrates in this way, there are problems that the fins 3 are lost or a large number of 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. 6B, the traveling direction line D2 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, so that the vibration of the disk-type cutter 14 can be suppressed. Thereby, the defect | deletion of the fin 3 can be prevented and generation | occurrence | production of the burr | flash in the groove | channel 4 can be suppressed.

  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 lengthened.

  Moreover, in this embodiment, since the first cutting process is performed in a state where tensile stress is applied to the surface 21c of the work material block 21, when the restraint of the metal member 20 to be cut by the table K is released after the extracting process, Thermal contraction occurs so that the surface 21c side is concave. Thereby, the to-be-cut metal member 20 can be made flat. Further, since the cutting is performed in a state in which the surface 21c side of the work material block 21 is convex, the disk-type cutter 14 is hardly sandwiched between the fins 3 and 3 formed by the cutting. Thereby, the operativity of the multi cutter 10 becomes favorable.

  Further, as shown in FIGS. 5B and 5C, 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 outer peripheral edge 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 suppressed.

  FIG. 7 is a side view for explaining a sampling process according to the present embodiment. As shown in FIG. 7, according to the extraction step according to the present embodiment, the multi-cutter 10 can be separated at the shortest distance by pulling out the multi-cutter 10 along the vertical line M. Here, a point where the outer peripheral edge of the disk-type cutter 14 and the surface 21c of the work material block 21 intersect in a side view is defined as an intersection 21f.

  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 surface 21c of the work material block 21, the distance P from the second ridge line 21b to the intersection 21f and the cutting depth W are: Always 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, it is possible to prevent the fins 3 formed in the first cutting step and the disk-type cutter 14 from coming into contact with each other and the fins 3 being lost or burrs being generated.

  As mentioned above, although it demonstrated in 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 outer peripheral edge 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. Moreover, you may perform the grooving process based on this invention with respect to the member which consists only of the workpiece block 21 without providing the base member 2. FIG. In this case, a member composed only of the work material block 21 may be fixed to the table K, and the spacer K2 may be disposed between the table K and the work material block 21 for cutting.

  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. When the second cutting process is completed, the above-described extraction process may be performed from the first ridge line 21a. If burrs remain after the second cutting step and the extraction step, a burr cutting step may be performed separately.

[Third embodiment]
FIG. 8 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 and the traveling direction line D3 of the disk type cutter 14 can be made parallel. . Thereby, since the force at the time of pressing the disk type cutter 14 with respect to the work material block 21 can be concentrated, generation | occurrence | production of a burr | flash can be suppressed. The angle σ is preferably in the range of 30 ° to 60 °.

[Fourth embodiment]
FIG. 9 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 recessed portion forming step for forming a recessed portion 30 having an arc shape in cross section is performed before the first cutting step (cutting step).

  In the grooving method according to the fourth embodiment, a preparation process, a recess forming process, a cutting process, a first cutting process, a sampling process, and a burr cutting process are performed. Since the preparation process, the first cutting process, the extraction process, and the burr cutting process are the same as those in the first embodiment, description thereof is omitted.

  In the recess forming step, as shown in FIG. 9 (see also FIG. 8), a recess 30 having an arc shape in cross section is formed by cutting along the first ridge line 21a of the work material block 21. The concave portion 30 may be formed by die casting when forming the metal member 20 to be cut instead of cutting. The radius of the recess 30 is the same as the radius R of the disk-type cutter 14.

  In the cutting process, the virtual line L4 connecting the virtual first ridge line 21a ′ corresponding to the first ridge line 21 and the rotation axis C and the traveling direction line D4 of the disk cutter 14 are parallel (overlapping), and the work is cut The virtual line H4 connecting the virtual first ridge line 21a ′ of the material block 21 and the center C1 of the arc of the recess 30 and the traveling direction line D4 of the disk cutter 14 are set to be parallel (overlapping), and the workpiece is cut Cut to a predetermined depth of the material block 21. The depth of cut may be set as appropriate, but here, it is set to a depth at which the outer peripheral edge of the disk cutter 14 reaches the base member 2.

  By setting the cutting process in this way, when the disk-type cutter 14 is pressed against the work material block 21, the pressing force of the disk-type cutter 14 can be concentrated on the recess 30 and the disk-type cutter 14 The outer peripheral edge contacts the arcuate recess 30 uniformly. As a result, the vibration in the out-of-plane direction of the disk cutter 14 can be reduced, so that the loss of the fins 3 can be prevented and the occurrence of burrs in the grooves 4 can be suppressed.

  In the above-described embodiment, the recess 30 is formed in the work material block 21 that is a part of the work metal member 20. However, the base member 2 is not provided, and the member made only of the work material block 21 is used. The recess forming step according to the present invention may be performed.

DESCRIPTION OF SYMBOLS 1 Heat sink 2 Base member 3 Fin 4 Groove 10 Multi cutter 14 Disc type cutter 15 Intermediate member 20 Metal member 21 Workpiece material block 21a 1st ridgeline 21b 2nd ridgeline 30 Recessed part

Claims (8)

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 metal work material block,
A preparation step of fixing the work material block to a table so that the surface of the work material block is convex;
A cutting step of forming a plurality of fins on the front side of the work material block with the multi-cutter, and
The grooving method according to claim 1, wherein the cutting step includes cutting in a state in which a tensile stress is applied to a surface of the work material block by a bending moment acting on the work material block. A recess forming step of forming an arc-shaped recess having a radius equivalent to that of the disk-shaped cutter, along one ridge line of the work material block exhibiting a rectangular parallelepiped,
The straight line connecting the virtual ridge line corresponding to the one ridge line and the rotation axis of the disk-type cutter is parallel to the traveling direction of the disk-type cutter, and the virtual ridge line of the work material block and the concave portion A cutting process of cutting to a predetermined depth of the work material block so that a straight line connecting the center of the arc and the traveling direction of the disc-shaped cutter are parallel to each other,
2. The grooving method according to claim 1, wherein in the cutting step, the disk cutter is moved from the virtual ridge line toward the other ridge line.   The said preparation material block is fixed in the said preparation process in the state which pinched | interposed the spacer between the surface of the said table, and the back surface of the said work material block, The Claim 1 or Claim 2 characterized by the above-mentioned. Grooving method.   The grooving method according to any one of claims 1 to 3, further comprising a burr cutting step of cutting a burr generated by the cutting step from the workpiece block. Form a plurality of grooves by rotating a multi-cutter in which a plurality of disk-type cutters are stacked on a metal member to be cut, which has a work material block and a base member disposed on the bottom surface of the work material block. A grooving method to
An exposed portion that is exposed around the work material block is formed on the surface of the base member,
A preparation step for fixing the metal member to be cut to a table so that the surface of the work material block is convex;
A cutting step of forming a plurality of fins on the front side of the work material block with the multi-cutter, and
The grooving method according to claim 1, wherein in the cutting step, cutting is performed in a state in which a tensile stress is applied to the surface of the work material block by a bending moment acting on the metal member to be cut. A recess forming step of forming an arc-shaped recess having a radius equivalent to that of the disk-shaped cutter, along one ridge line of the work material block exhibiting a rectangular parallelepiped,
A straight line connecting a virtual ridge line corresponding to one ridge line of the work material block and a rotation axis of the disk type cutter is parallel to a traveling direction of the disk type cutter, and the virtual block of the 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 ridge line and the center of the arc of the concave portion and the traveling direction of the disc-shaped cutter are parallel,
6. The grooving method according to claim 5, wherein, in the cutting step, the disk-type cutter is moved from the virtual ridge line toward the other ridge line.   The grooving according to claim 5 or 6, wherein, in the preparation step, the metal member to be cut is fixed in a state where a spacer is sandwiched between the front surface of the table and the back surface of the base member. Processing method.   The grooving method according to any one of claims 5 to 7, further comprising a burr cutting step of cutting a burr generated by the cutting step from the metal member to be cut.

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