JP5871701B2 - Cutting tool manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a cutting tool used when forming fine transfer grooves on the surface of a die roll.

  A plurality of slit-like fine grooves may be formed on the surface of the heat dissipating component or the heat exchanging component in order to improve the heat exchange rate. Thus, when forming a fine groove | channel on the surface of a member, it is common to carry out by the transfer rolling using a type | mold roll. In other words, the pattern of the transfer groove is transferred to the surface of the metal plate by pressing a roll with a mold having fine transfer grooves formed on the surface in advance on the surface of the metal plate, and the transfer groove is formed on the surface of the heat dissipation component or heat exchange component. It is processed over multiple lines.

  By the way, when the transfer rolling is repeatedly performed, the groove shape of the transfer groove is worn due to wear, and therefore, re-polishing (re-groove formation) of the die roll is necessary every certain period. Also, when a new roll with a mold is produced, a transfer groove pattern must be newly formed on the surface of the original roll. In any of these cases, it is necessary to perform fine transfer groove processing on the original roll.

  As a method for grooving the original roll in this way, a method using a diamond tool as shown in Patent Document 1 is known as the simplest method. The method of Patent Document 1 uses a diamond tip with a sharp tip as a cutting tool, presses the tip of the diamond tip against the outer peripheral surface of a rotating original roll, and scrapes the surface thereof to form a V-shaped or U-shaped on the roll surface. The groove of the mold is processed one by one.

  The processing method of Patent Document 1 is a method of forming grooves very simply, but since the grooves are formed one by one, it cannot be said that the processing efficiency is very good. In particular, when a very large number of fine transfer grooves have to be formed as in the above-described heat dissipating parts and heat exchanging parts, if each one is processed, it takes a lot of time and labor to process. End up. In addition, in the case where the grooves to be formed are continuous like a spiral, the material to be transferred shifts in a direction perpendicular to the transfer direction (plate width direction) at the time of roll transfer. Cannot be manufactured. For this reason, in order to divide the grooves into a plurality of grooves and process them in parallel with the circumferential direction of the roll, it is necessary to frequently align the cutting edge, and the process becomes extremely complicated.

  Therefore, Patent Document 2 discloses a technique of using a block dresser metal fitting having a plurality of grooves as a cutting tool. The tool of this Patent Document 2 has a plurality of cutting blades on the surface of the tool, and can process a plurality of transfer grooves on the roll surface at a time by one processing.

JP 2000-153553 A JP-A 63-156659

By the way, when a tool such as the block dresser metal fitting of Patent Document 2 is used, the speed and efficiency of grooving are dramatically improved. However, on the other hand, it becomes difficult to process the cutting tool itself, and even if it can be processed, there is a problem that the cost of the cutting tool increases.
That is, electric discharge machining and etching are common as a technique for machining a groove in a cemented carbide material used for a cutting tool. However, the grooves formed in the cutting tool are very fine with a groove width of 10 μm and a groove pitch of about 100 μm, which is close to the limit of the groove size that can be processed by electric discharge machining and etching, and is extremely difficult to machine. It is. For example, when grooving is performed by electric discharge machining, the diameter of the discharge wire, which is the smallest of those currently in circulation, is as thick as about 100 μm, and grooving is performed at a pitch and groove width similar to the size of the discharge wire. It is extremely difficult.

In addition, the smaller the diameter of the discharge wire, the easier it is to break the wire during processing. Therefore, if the diameter of the wire used is too small, it will take time and effort to replace the broken wire, resulting in the price of the cutting tool. It will be a cause to soar.
On the other hand, a groove can be formed by etching, but when a fine groove is obtained by etching, the groove shape often does not become an edge shape. That is, when etching is performed, the vicinity of the opening edge of the groove is apt to be dissolved more easily than other places, and the opening edge is often rounded. Naturally, even if the transfer groove is machined using a cutting tool obtained by such a method, the shape of the transfer groove does not become the desired one, and as a result, heat dissipation parts and heat exchange formed using this transfer groove This also causes the heat exchange performance of the parts to deteriorate.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for manufacturing a cutting tool that can efficiently form a fine groove having a small groove width and groove pitch at low cost. .

In order to solve the above problems, the method for manufacturing a cutting tool of the present invention employs the following technical means.
That is, the manufacturing method of the cutting tool of the present invention is continuous along the circumferential direction of the outer peripheral surface of the original roll in the manufacture of a die roll used for forming a groove on the surface of a metal plate used as a heat exchange component. a slit-shaped transfer grooves are those formed over a plurality of conditions with a pitch Lg fabricating the typed rolls, a method for producing a cutting tool of hard material is formed in a substantially rectangular angular On the surface of the cutting tool pressed against the original roll, a plurality of cutting blades that form the transfer grooves by cutting the surface of the original roll are subjected to discharge application using a discharge wire having a wire diameter of 100 μm or more. is formed by forming a groove in Engineering, pitch Lc of the plurality of cutting blades, are a 100μm or more, and that it is an integral multiple n of the pitch Lg transfer grooves (n is 2 or more) Features A.

Preferably, the plurality of cutting blades may have a blade width d of 10 to 1000 μm and a pitch Lc of the cutting blades of 100 μm to 1000 μm .

  Preferably, the tool width W of the cutting tool may be n × L × m, where m is the number of cutting blades disposed.

According to the method for manufacturing a cutting tool of the present invention, a fine groove having a small groove width and groove pitch can be efficiently formed at low cost.

(A) is a figure which shows the manufacturing method of the heat radiating component of this invention, or a heat exchange part, (b) is the figure which showed the process of the transfer rolling using a die-shaped roll. It is the figure which showed the method of processing a transcription | transfer groove | channel with respect to an original roll using the cutting tool of 1st Embodiment. It is an enlarged view of the cutting tool of 1st Embodiment. (A) is the figure which showed the dimension of the cutting tool of 1st Embodiment, (b) is the figure which showed the dimension of the cutting tool of 2nd Embodiment, (c) is the cutting tool of a prior art example. It is the figure which showed the dimension. It is the figure which showed the method of forming a transfer groove | channel on the surface of an original roll using the cutting tool of 1st Embodiment.

[First Embodiment]
Hereinafter, the cutting tool 1 and the cutting method of this invention are demonstrated based on figures.
The cutting tool 1 of the present invention is a tool that is pressed against the surface of a metal plate or the like that is a cutting object to process a micron-order fine pattern or groove. In this embodiment, the die roll 2 is manufactured or re-polished. This is used for (reforming the transfer groove 3). Specifically, a plurality of transfer grooves 3 that form fine grooves on the surface of the metal plate by transfer rolling are provided on the surface of the die roll 2 used for manufacturing heat exchange parts such as a heat radiating plate and a heat exchange plate. It is formed over the strip. The cutting tool 1 is used for rewinding a used roll or manufacturing a new roll. In the following, first, prior to the description of the cutting tool 1, a die roll 2 manufactured using the cutting tool 1 of the present invention and a heat exchange component manufactured using the die roll 2 will be described. In addition, the heat exchange plate 4 is illustrated as a heat exchange part, and description is advanced.

The heat exchange plate 4 described above is a plate member made of aluminum or the like that is accommodated in the heat exchanger and performs heat exchange. In order to increase the surface area (heat exchange area), a plurality of micron-order grooves are formed on the plate surface. It is formed over. When such a micron-order groove is formed on the surface of a metal plate such as aluminum, transfer rolling using the above-described die roll 2 is performed.
FIG. 1A schematically shows a transfer rolling method using a die roll 2.

  As shown to Fig.1 (a), when manufacturing the heat exchange plate 4, the processing apparatus 5 provided with the some roll is used. This processing device 5 includes a pair of upper and lower transfer rolls (entrance side roll 6) for transferring a metal plate before rolling, a die roll 2 and a support roll for performing transfer rolling on the metal plate transferred by the transfer roll. 7 and a pair of upper and lower transfer rolls (exit-side rolls 8) for transferring the rolled metal plate.

As shown in FIG.1 (b), the transfer groove | channel 3 is formed in the outer peripheral surface of the roll 2 with a pattern over the strip | belt along the circumferential direction. Each transfer groove 3 is connected in an annular shape so as to make one round around the axis of the die roll 2 and is formed in parallel to each other at a distance in the axial direction.
A support roll 7 is provided below the roll with mold 2. If a plate member is inserted between the support roll 7 and the die roll 2, and the plate member is sandwiched between these rolls and transferred and rolled, the transfer groove 3 is transferred and rolled on the surface of the plate member. It is possible to form fine grooves in the exchange plate 4.

  By the way, if the transfer rolling using the above-mentioned die roll 2 is repeated, the roll is worn and the shape of the transfer groove 3 deviates from the desired shape. Therefore, the original roll 10 (before the groove is formed on the outer peripheral surface) Work (that is, a plain roll) is prepared, and a work (re-grinding work) for newly forming the transfer groove 3 on the surface thereof is required. In addition, when the die roll 2 is newly produced, it is necessary to form the same transfer groove 3 with respect to the original roll 10. Next, a method for forming (transferring) such a transfer groove 3 on the surface of the original roll 10 will be described.

  First, as shown in FIG. 2A, when the transfer groove 3 is formed, the tip (lower end in the illustrated example) of the cutting tool 1 is first pressed against the outer peripheral surface of the rotating original roll 10. The pressing surface (lower surface) of the cutting tool 1 has a portion protruding in a planar shape further downward, and a plurality of cutting blades 11 are provided on the protruding portion. The plurality of cutting blades 11 are all attached with their cutting edges facing downward, and are arranged with a certain pitch in the axial direction of the original roll 10. Therefore, if the original roll 10 with the cutting blade 11 pressed against the outer peripheral surface of the original roll 10 is rotated once, the cutting blade 11 moves the outer peripheral surface of the original roll 10 in the circumferential direction as the original roll 10 rotates. The transfer grooves 3 that are continuously carved along the circumferential direction and are continuously connected in the circumferential direction are formed on the outer circumferential surface of the original roll 10 over a plurality of strips at a time.

When a plurality of transfer grooves 3 are thus formed, the cutting tool 1 is pulled away from the outer peripheral surface of the original roll 10 as shown in FIG. Then, the cutting blade 11 is moved horizontally by the width of the cutting tool 1 along the axial direction of the original roll 10, and a plurality of transfer grooves are newly provided so as to be adjacent to the plurality of transfer grooves 3 formed previously. 3 is formed.
If the cutting with the cutting blade 11 and the movement of the cutting blade 11 are alternately repeated in this way, the transfer groove 3 can be continuously formed on the surface of the original roll 10 for each of a plurality of strips.

By the way, since the cutting tool 1 described above is generally formed from a cemented carbide or SK steel containing tungsten or the like, when machining such a cemented carbide material, a machining method such as electric discharge machining or etching machining is performed. Is generally adopted.
However, when the size and pitch of the transfer groove 3 to be formed on the die roll 2 is very fine (for example, when the groove width is 10 μm and the groove pitch is about 100 μm), a processing method such as electric discharge machining or etching processing is used. It is extremely difficult to adopt. This is because such groove width and groove pitch are close to the processing limit, and the processing is extremely difficult. Further, even if the processing is completed, there is a high possibility that labor and time will increase and the price of the cutting tool 1 will rise, or the transfer groove 3 having a desired shape cannot be formed ("Problem to be solved by the invention"). reference).

  Therefore, in the cutting tool 1 of the present invention, when the slit-shaped transfer groove 3 is formed over a plurality of lines with the pitch Lg, the pitch Lc of the plurality of cutting blades 11 described above is an integer of the pitch Lg of the transfer groove 3. It is set to become n times. Then, by repeating the forming operation of pressing the cutting blade 11 to form the transfer groove 3 and moving the cutting tool 1 by the pitch Lg along the axial direction of the original roll 10, the original roll 10 A plurality of transfer grooves 3 are formed on the surface. With such a cutting tool 1 or a cutting method, the pitch Lc of the cutting blade 11 formed on the cutting tool 1 can be made larger than the pitch Lg of the transfer groove 3, so that it can be easily performed by means such as ordinary electric discharge machining. The cutting blade 11 can be formed, and there is no possibility of raising the price of the cutting tool 1.

In other words, the cutting tool 1 of the present invention employs a cutting method in which the transfer groove 3 is formed n times for each pitch Lg, and the cutting blade 11 has a pitch Lc that enables such a cutting method. It can also be said that the manufacturing cost of the cutting blade 11 can be kept low by arranging the above. Next, the cutting tool 1 of 1st Embodiment is demonstrated.
FIG. 3 is a view of the cutting tool 1 of the first embodiment as viewed from the front lower diagonal direction.

  As shown in FIG. 3, the cutting tool 1 of 1st Embodiment is formed in the substantially rectangular square shape from the hard material which performed heat processing, such as the powder-sintered superhard material containing tungsten carbide etc., and tool steel. . A fixing hole 12 for fixing the tool body to a processing machine or the like is provided on the surface of the cutting tool 1 so as to penetrate the tool body. Moreover, the lower surface of the cutting tool 1 protrudes (swells) in the middle in the width direction downward as compared with both end sides, and a plurality of the cutting blades 11 described above are provided in the protruding portion. The plurality of cutting blades 11 are formed by forming the grooves 13 along the plate thickness direction by electric discharge machining at every pitch Lc in the plate width direction, and the portion where the grooves 13 are not formed is downward. It protrudes toward the cutting edge.

4 (a) to 4 (c) show how the plurality of cutting blades 11 are arranged in comparison between the cutting tool 1 of the present invention and the cutting tool 1 of the conventional example. 4A shows the cutting tool 1 of the first embodiment, FIG. 4B shows the cutting tool 1 of the second embodiment, and FIG. 4C shows the cutting tool 101 of the conventional example. .
Moreover, the cutting tool 1 shown to Fig.4 (a)-FIG.4 (c) is equipped with the cutting blade 11 of the blade width d over multiple strips by the pitch width Lc, and all are on the outer peripheral surface of the original roll 10. FIG. The transfer groove 3 having the groove width d is used to form a plurality of strips with a pitch width Lg.

  As shown in FIG. 4A, in the cutting tool 1 of the first embodiment, the lateral width (tool width) of the protruding portion of the cutting tool 1 is W, and the lower surface of the protruding portion is downward. A plurality of cutting blades 11 are formed. These cutting blades 11 have a blade width d of 10 μm or more and 1000 μm or less, preferably 10 μm or more and 200 μm or less. The pitch Lc of the cutting blades 11 formed on the cutting tool 1 of the first embodiment is 100 μm or more, preferably 100 μm or more and 1000 μm or less. This pitch Lc is twice the pitch width Lg of the cutting blade 11 to be finally formed.

Next, using the cutting tool 1 shown in FIG. 4A, a method of forming the transfer groove 3 having a groove width d and a pitch width Lg on the surface of the original roll 10 across a plurality of strips, in other words, according to the first embodiment. The cutting method will be described with reference to FIGS. 5 (a) to 5 (d).
As shown to Fig.5 (a), it is one end side of the original roll 10 (roll before a groove | channel is formed in an outer peripheral surface), Comprising: The position away from the surface of the original roll 10 by a fixed distance (illustration example Then, the cutting tool 1 is moved to a position separated upward. At this time, a plurality of cutting blades 11 having a blade width d protruding downward are provided on the lower surface of the cutting tool 1 at a pitch Lc in the horizontal direction (three locations in the example). Note that the pitch Lc of the cutting blade 11 is twice the pitch width Lg of the transfer groove 3 to be finally formed on the original roll 10.

As shown in FIG. 5B, when the cutting tool 1 is brought close to the surface of the original roll 10, the cutting blade 11 enters the original roll 10. And if the original roll 10 is rotated in this state, the cutting blade 11 will dig up the surface of the original roll 10 along the circumferential direction, and the transfer groove | channel 3 continuously connected in the circumferential direction will be formed over several strips. .
Next, as shown in FIG. 5C, the cutting tool 1 is moved horizontally by a distance Lg along the axial direction of the original roll 10. In the cutting tool 1 of the first embodiment, the pitch Lc of the cutting blade 11 is twice the pitch width Lg of the transfer groove 3 as described above, and therefore the position moved horizontally by the distance Lg (FIG. 5C). The transfer groove 3 can also be formed at the position shown in FIG. As the mechanism for moving the cutting tool 1 along the axial direction of the original roll 10 by the distance Lg, a moving mechanism provided in a machine tool such as a lathe can be used. It is possible to move.

5D, an operation similar to the operation in FIG. 5B is performed to bring the cutting tool 1 close to the surface of the original roll 10, and the cutting blade 11 moves the roll surface along the circumferential direction. The transfer grooves 3 that are continuously connected in the circumferential direction are formed over a plurality of strips.
When the transfer groove 3 having the groove width d is thus formed on the surface of the original roll 10 with the pitch width Lg, the cutting tool 1 is moved horizontally by the tool width W, and the above operation is repeated again at the moved position. Thus, a new transfer groove 3 is produced. The distance (tool width W) for horizontally moving the cutting tool 1 is the number obtained by dividing the number of cutting blades 11 provided in the cutting tool 1 by m and the pitch Lc of the cutting blade 11 by the pitch width Lg of the transfer groove 3. When n, the width is Lg × n × m. This is because the transfer groove 3 can be continuously formed at the same pitch even after the cutting tool 1 is moved horizontally by the tool width W.

In this way, if the pitch Lc of the cutting blade 11 is set to twice the pitch width Lg of the cutting blade 11 to be finally formed, after forming the transfer groove 3 by the first transfer rolling, the cutting tool 1 is removed. The second transfer rolling can be performed after moving the pitch Lg, and the transfer groove 3 having the pitch width L of the cutting blade 11 can be formed in two steps.
For example, when the conventional cutting tool 101 shown in FIG. 4C is used, a cutting blade 111 having a blade width d is formed on the surface thereof, and the groove width d is transferred to the surface of the original roll 10. The groove 103 can be formed across a plurality of strips with a pitch width Lg. Consider a case where the transfer groove 103 is formed with a pitch Lg = 100 μm using such a conventional cutting tool 101.

  At this time, if the groove width d is subtracted, it is necessary to form a transfer groove 103 having a groove width of Lg-d on the roll surface, and a very thin discharge wire having a wire diameter of 100 μm or less must be used. However, it is very difficult to perform electric discharge machining using such a thin electric discharge wire, and even if the operation is possible, it takes much time and effort. In addition, since such a thin discharge wire is liable to cause a disconnection or the like, it takes time and effort to replace the disconnected discharge wire, which causes the price of the cutting tool 101 to rise.

However, since the pitch Lc of the cutting blade 11 formed by the cutting method of the first embodiment can be a large value regardless of the pitch Lg of the transfer groove 3, the cutting blade can be easily cut by a general processing means such as electric discharge machining. 11 can be formed, and there is no possibility of raising the price of the cutting tool 1.
For example, in the case of the cutting tool 1 according to the first embodiment shown in FIG. 4A, the cutting blade 11 may be formed at an interval twice the pitch width Lg of the transfer groove 3. That is, even when the transfer groove 3 is formed with a pitch width of 100 μm using the cutting tool 1 of the first embodiment, the pitch of the cutting blades 11 may be 200 μm. Therefore, when manufacturing the cutting tool 1 of the first embodiment, a general discharge wire having a wire diameter of 100 μm or more can be used, and the manufacturing cost is increased by using a thin discharge wire. There is no fear of it.
[Second Embodiment]
Next, the cutting tool 1 of 2nd Embodiment is demonstrated.

In the first embodiment, the pitch Lc of the plurality of cutting blades 11 is twice the pitch Lg of the transfer groove 3, but the pitch Lc of the cutting blade 11 is the transfer groove 3 as in the second embodiment described below. The pitch Lg may be 3 times, or may be an integer multiple (n times) of 4 or more.
As shown in FIG. 4B, the cutting tool 1 of the second embodiment is formed such that the pitch width Lc of the cutting blade 11 is three times the pitch width Lg of the transfer groove 3. When the transfer groove 3 is formed on the surface of the original roll 10 using the cutting tool 1 according to the second embodiment, after the transfer groove 3 is formed by the first transfer rolling, the cutting tool 1 is moved to the pitch Lg. The transfer groove 3 having the pitch width Lg of the cutting blade 11 is formed in three steps by moving the cutting tool 1 for the second time and performing the third transfer rolling by moving the cutting tool 1 by the pitch Lg. do it.

In other words, in the cutting tool 1 of the present invention, the groove pitch Lg of the transfer groove 3 can be reduced as the number of times n of moving the cutting tool 1 is increased, and the transfer groove 3 can be formed without changing the wire diameter. Only the pitch can be narrowed.
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. In particular, in the embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component deviate from a range that a person skilled in the art normally performs. Instead, values that can be easily assumed by those skilled in the art are employed.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Roll with a mold 3 Transfer groove 4 Heat exchange plate 5 Processing apparatus 6 Incoming roll 7 Support roll 8 Outgoing roll 10 Original roll 11 Cutting blade 12 Fixing hole 13 Groove d Blade width of cutting blade (transfer groove) Lg Pitch width of cutting blade (transfer groove) m Number of cutting blades provided in one cutting tool W Tool width of cutting tool

Claims (2)

In the production of a die roll used for forming a groove on the surface of a metal plate used as a heat exchange component , a plurality of slit-like transfer grooves with a pitch Lg are provided that are continuous along the circumferential direction of the outer peripheral surface of the original roll. formed over it is intended to fabricate the typed rolls, a method for producing a cutting tool of hard material is formed in a substantially rectangular angular surface of devoted cutting tool pushed into the source roller the plurality of cutting blades forming the transfer grooves by cutting the surface of the original roll is formed by forming a groove in the discharge machining to the wire diameter is used or more discharge wire 100 [mu] m, A method for manufacturing a cutting tool , wherein a pitch Lc of the plurality of cutting blades is 100 μm or more and an integer multiple n (n is 2 or more) of a pitch Lg of the transfer groove. 2. The method for manufacturing a cutting tool according to claim 1, wherein the plurality of cutting blades have a blade width d of 10 to 1000 μm and a pitch Lc of the cutting blades of 100 μm to 1000 μm.