TW201444629A - Cutter wheel and its manufacturing method thereof - Google Patents

Abstract

The present invention provides a cutter wheel and its manufacturing method thereof, whose front end angle of blade is maintained the same obtuse angle as that in the prior art, and which can be inserted into the scribing path with a narrow width to proceed machining and scribing lines. The solution means is: a cutter wheel 1A which can be formed of the hard material that can be machined by discharging, the cutter wheel has a front end 2 of blade. The front end angle of blade is formed to have an obtuse angle on the outer periphery surface by grinding-machining. Near the ridge line of the front end 2 of blade, one portion of the left and right inclined planes 2a, 2b is cut by discharging machining in the state that the front end portion of the front end 2 of blade with the obtuse angle still remains, so as to form the depression part 3.

Description

Cutter wheel and manufacturing method thereof

The present invention relates to a cutter wheel (also referred to as a scoring wheel) used for processing a brittle material substrate such as a ceramic substrate or a glass substrate, and dividing the scribe line (notched), and a method of manufacturing the same.

In the processing of breaking a brittle material substrate such as a ceramic substrate such as alumina, HTCC or LTCC, or a glass substrate, a method disclosed in, for example, Patent Document 1 is known, which uses a cutter wheel. A scribe line is formed on the surface of the substrate, and then an external force is applied from the back side along the scribe line to deflect the substrate, thereby dividing the substrate into each unit.

Regarding the substrate to be processed, various substrates exist, and in some cases, it is necessary to perform the breakage in the state where the surface of the substrate has irregularities. In the case of such a substrate, in addition to the unevenness formed on the substrate itself, for example, as shown in the perspective view of FIG. 8 and the enlarged cross-sectional view of a portion of FIG. 9, the protrusion is fixed to the substrate.

For example, in the ceramic laminated mother substrate W for LEDs, an element D such as an LED is mounted on the low temperature fired ceramic (LTCC) or alumina ceramic (Al ₂ O ₃ ) substrate 11, and formed around the elements D. The coating layer 14 made of a resin sheet in which the sheet surface 12 and the protrusion portion 13 are integrally formed is formed, whereby the element D (LED body) is sealed. In the conventional substrate, the interval L1 between the adjacent protrusions 13 is about 0.12 mm, and the thickness (height) H of the coating layer 14 is about 0.03 mm.

a cutter wheel for machining a score line S between adjacent protrusions 13 in general, A cutter wheel made of superhard alloy or sintered diamond (PCD) is used as a material having excellent tool properties such as abrasion resistance or grinding property. However, since it is used repeatedly in a crimped state, the use environment of the tip end is bad. Therefore, if the tip end angle of the tip end of the cutter wheel is set to a very acute angle, it is easy to cause the blade edge passivation or the like to shorten the service life of the blade. Further, when the blade tip end angle is excessively set to an acute angle, the load component applied in the vertical direction of the substrate at the time of pressure bonding becomes large, which makes it difficult to control the load. In particular, since the diameter of the cutter wheel to be used is about 1 mm to 7 mm, which is extremely small, it is easy to make load control difficult. Therefore, it is generally desirable to have a cutter wheel having an obtuse blade tip end angle.

Therefore, in order to use the above-mentioned cutter wheel having the tip end of the obtuse angle, The scribe line S is formed between the protrusions 13 and 13 of the mother substrate W, and the interval L1 between the protrusions 13 and 13 in the pattern of the cladding layer 14 of the mother substrate W is designed to be the height H with respect to the protrusion 13. About 3 times more. That is, the value of the interval L1 or the height H is designed in such a manner that the scribe is performed by the cutter wheel having the tip end of the obtuse angle, and the front end of the blade which is allowed in such a space L1 or height H is used. Angle cutter wheel.

For example, as shown in FIG. 9, even if the cutter wheel K having the blade tip end angle α (for example, 105 degrees) is used, a gap C can be left between the blade leading end inclined surface and the upper end edge portion of the protruding portion 13, so that the cutting edge can be The scribing line S is processed without touching the protrusion 13 .

Patent Document 1: Japanese Patent No. 3787489

In recent years, from the viewpoint of increasing the number of unit substrates cut out from the mother substrate and suppressing the cost of the product, the area of the unit substrate to be cut tends to be gradually reduced. For example, in the case of manufacturing an LED, the planar size of the unit substrate is required to be reduced from the current 2.0 mm x 1.6 mm to 1.0 mm x 0.8 mm. Further, not only the area of the unit substrate, but also The width of the scribed line, that is, the interval L1 between the protrusions 13 and 13 is also required to be small in size and mass production. Specifically, the interval L1 is wider at the current 0.12 mm, and it is necessary to reduce it to 0.06 mm or less.

However, if the interval L1 is reduced to 0.06 mm, it will be as shown in FIG. In the cutter wheel K having the tip end angle α of the obtuse angle as in the conventional (refer to FIG. 9), the inclined surface of the tip end of the blade (the inclined surface on both sides of the ridge line at the tip end of the blade) is in contact with the upper edge portion of the protrusion 13 to injure the protrusion. Part 13, so it cannot be used. Therefore, in order to avoid contact, it is necessary to set the blade tip end angle α' as shown by an imaginary line (two-point chain line) to an acute angle of 90 degrees or less in Fig. 10 . However, in the case where the tip end of the sharp-edged blade is used, blade passivation or the like is easily generated as described above to shorten the service life. Further, when the tip end of the blade further becomes an acute angle, the hard particles such as tungsten carbide or diamond used in the material of the cutter wheel are liable to fall off, and the strength of the tip end is remarkably lowered, and the polishing process is also difficult. Further, various problems such as difficulty in load control at the time of scribing are generated.

Accordingly, it is an object of the present invention to provide an even front end angle and conventional knowledge. Similarly, the obtuse angle is maintained, and the width of the scribed path between the adjacent protrusions is narrow (specifically, 0.06 mm or less), and the knives can be scribed without the front end of the blade being contacted (protrusion). And its manufacturing method.

In order to solve the above problems, in the present invention, a technical hand as follows is proposed. segment. That is, the cutter wheel of the present invention is formed of a hard material that can be electrically processed, and the tip end angle of the edge ridge line formed by the left and right slopes is an obtuse angle, and is configured as follows: the front end near the front end ridge line of the blade A portion of the edge of the obtuse blade is left and left, and a part of the left and right slopes continuous to the front end portion is cut by electric discharge machining, and a trapped portion is formed on the left and right slopes.

In addition, in the method of manufacturing the cutter wheel of the present invention, the cutter wheel is formed by the left and right slopes Forming a blade front end ridge line is performed in such a manner that the outer peripheral surface of the disk-shaped disk body composed of the hard-dischargeable hard material is subjected to grinding processing, and the tip end angle of the blade edge ridge line is formed to be an obtuse angle. a beveled surface, and then the front end portion near the front end ridge line of the blade is set as the front end of the obtuse angle blade and remains, and a part of the left and right inclined faces continuing to the front end portion is cut by electric discharge machining, and the left and right inclined faces are formed into the crotch portion .

Here, the front end angle of the blade of the cutter wheel is preferably from 90 degrees to 150 degrees. Thereby being able to The shape or size of the crotch portion is selected depending on the interval and height between the projections of the scribed substrate, and is not in contact with the substrate. Further, as the hard material that can be electrically processed, superhard alloy or sintered diamond, conductive single crystal diamond or polycrystalline diamond can also be used. In addition, continuous irregularities may be formed along the ridgeline at the front end of the blade.

According to the present invention, since the left and right slopes of the end portion continuous to the obtuse angle are cut off The part of the blade is formed into a trapped portion, so that the left and right widths in the front end portion of the front end of the blade edge can be made narrow only by the amount of the cut, even if the width of the scribed path between the adjacent protrusions is narrow, The scoring is performed without contacting the edge of the protrusion. In addition, the machining of the shank of the cutter wheel can be performed by electric discharge machining only by a conventional cutter wheel having a sharp-edged blade tip end angle (not formed with a stern portion) which is stored in a conventional product (by grinding). Since the electrode (wire or jig electrode) is pressed by additional processing on the bevel of the tip end of the blade, it can be easily and accurately manufactured even in the processing of a fine portion. Further, since the crotch portion which is cut by the electric discharge machining is not in contact with the substrate to be processed at the time of scribing and is scribed, it is possible to maintain the state as a product without performing post-processing such as polishing finishing. Moreover, since the front end portion of the front end of the blade retains the front end ridgeline of the obtuse angle of the original cutter wheel, it is possible to scribe the same dimension as the conventional one. With the necessary front end strength, it can be used for a long time without blade passivation. Further, there is an effect that load control can be performed with ease equivalent to the conventional one.

L1‧‧‧ spacing of the protrusions of the mother substrate

L2‧‧‧ left and right width of the front end of the cutter wheel

S‧‧ scribe

Α‧‧‧ blade front angle

H‧‧‧ height of head

1‧‧‧Cutter wheel

1A, 1A'‧‧‧Cutter wheel before machining

2‧‧‧ blade front end

2a, 2b‧‧‧ left and right bevels on the front end of the blade

3‧‧‧洼

Figure 1 is a front elevational view of the cutter wheel of the present invention.

Fig. 2 is a view showing the front end of the blade edge of the cutter wheel as a crotch portion by wire-cut electric discharge machining.

Figure 3 is an enlarged cross-sectional view showing the front end portion of the blade of the cutter wheel.

Fig. 4 is an enlarged view showing the state of use of the cutter wheel.

Fig. 5 is a view showing a state in which the cutter wheel is applied as a crotch portion by a shape electric discharge machining.

Fig. 6 is a view showing another example of the method of forming a shape electric discharge machining similar to that of Fig. 5.

Fig. 7 is a front view showing a modification of the processed shape of the crotch portion.

Fig. 8 is a perspective view showing an example of a mother substrate to be processed.

Figure 9, is a partially enlarged cross-sectional view of Figure 8.

FIG. 10 is a cross-sectional view showing a virtual example in which the projection of the mother substrate is set to have a narrow width.

Hereinafter, the cutter wheel of the present invention and a method of manufacturing the same will be described in detail based on the drawings. Here, a case where the scribing of the mother substrate having the protrusion on the surface of the substrate is optimal will be described as an example.

Fig. 1(a) is a front view showing a cutter wheel 1 of the present invention, which is made of a hard material (e.g., metal) having electrical conductivity and electrical discharge machining. Specifically, it is made, for example, of a super hard alloy or a sintered diamond, a single crystal diamond having conductivity, or a polycrystalline diamond. In the diamond Among the preconducting properties, a method of doping impurities such as boron during synthesis is known. In a polycrystalline diamond, a diamond synthesized by a chemical vapor phase growth method or a diamond obtained by sintering a fine diamond particle without using a binder. In addition, the sintered diamond generally has conductivity by containing cobalt or the like as a binder, but in order to perform more precise electric discharge machining, a sintered diamond using a diamond particle which imparts conductivity by mixing impurities may be used. .

The cutter wheel 1 is a cutter wheel having a blade tip end 2 which forms a tip end angle of a blade tip end ridge at an obtuse angle, for example, an angle of 105 degrees, on the outer peripheral surface of the disk-shaped disk body, as shown in Fig. 1(b). Manufactured in 1A. That is, the front end portion near the front end ridge line having the tip end angle of the obtuse angle is left, and one of the left and right slopes 2a, 2b of the front end 2 of the front end portion is cut off by the electric discharge machining on the inclined surface 2a, 2b. The crotch portion 3 shown in Fig. 1(a) is formed.

The cutter wheel 1A shown in Fig. 1(b) before machining the crotch portion 3 is smooth and flat The ridge line forms a general blade for scribing the front end of the tip end of the blade, that is, a normal cutter wheel having no notch (concave portion) at the ridge line portion of the blade, and the blade tip 2 is formed by grinding. And the front end surface of the blade is ground and finished. Further, it is formed in a small size having a diameter of about 1.0 mm to 7.0 mm, preferably 1.0 mm to 3.0 mm, and a thickness of about 0.4 mm to 1.1 mm. These systems are used as a cutter wheel while maintaining this state, and are stored as a stock.

Further, as the cutter wheel before the boring portion 3, a cutter wheel having a continuous small unevenness (notch) 8 along the ridge line at the tip end of the blade as shown in Fig. 1(c) may be used (a cutter wheel having a groove) ) 1A'. The Penett (registered trademark) cutter wheel and the APIO (registered trademark) cutter wheel manufactured by Samsung Diamond Co., Ltd. are present in the grooved cutter wheel 1A'. The cutter wheel of the present invention can be formed by further processing the cutter wheels 1A and 1A' shown in Figs. 1 (b) and (c).

Next, in an example shown in FIG. 2, the bevel of the front end 2 of the blade of the cutter wheel 1 is 2a, 2b, a method of processing the crotch portion 3 by wire-cut electrical discharge machining.

In this method, as shown in Figs. 2(a) and 2(b), a rotary shaft (not shown) is fitted to the shaft hole 4 of the cutter wheel 1A (or 1A'), and the wire electrode is rotated while the cutter wheel 1A is rotated. 5, the inclined surface 2a on one side of the front end 2 of the blade moves, and a part of the inclined surface 2a is cut.

Next, as shown in Fig. 2(c), the wire electrode 5 is moved on the inclined surface 2b on the other side of the blade tip end 2, and a part of the slope 2b is cut. As a result, as shown in Fig. 2(d), a part of the left and right inclined faces 2a, 2b which are continuous with the front end portion of the blade tip end 2 are formed, and the crotch portions 3, 3 which narrow the width of the front end portion of the blade tip end are formed. Knife wheel 1.

The crotch portion 3 formed in this manner is shown in an enlarged view of Figs. 3 and 4 The front end angle of the blade of the obtuse angle and the left and right width L2 of the front end portion of the blade end of the cutter wheel 1 are predetermined with respect to the scribed path between the adjacent projections 13 and 13 on the substrate to be processed. The width L1 is small, and the notch shape or the notch size of the crotch portion 3 is selected such that the cutter wheel 1 and the projection portion 13 do not contact each other.

For example, in the case of a substrate in which the interval L1 of the protrusions 13 is 0.06 mm and the height H is 0.03 mm, the width L2 of the tip end portion of the obtuse angle of the cutter wheel 1 is set to 0.04 mm, and the position from the edge of the blade edge is 0.03 mm. The height h is set to 0.05 mm. Further, the width L2 of the front end portion of the cutter wheel 1 may be selected in the range of 0.01 mm to 0.05 mm corresponding to the width of the interval L1 of the protrusion portion 13, and the height h of the front end portion may be corresponding to the height H of the protrusion portion 13 Choose from a range of 0.005mm to 0.06mm. Further, it is preferable to select so that the difference between the widths L1 and L2 is 0.02 mm or more.

As a result, as shown in FIG. 4, when the tip end 2 of the cutter wheel 1 is positioned in the width L1 of the scribed path between the projections 13 and 13 of the substrate to be processed, and the scribe line S is processed, it is possible to The protrusions 13 are scribed in a state in which a sufficient gap C is maintained between them.

In addition, in FIG. 4, although the scribing path of the substrate to be processed is also covered with a resin layer, the substrate may be exposed at the scribed path portion.

Fig. 5 shows a method of processing a cutter wheel by means of a shape electric discharge machining.

In this method, the pair of jig electrodes 6a and 6b having the inverted shape of the portion to be cut are alternately moved from the opposite side to the blade leading end slopes 2a and 2b of the cutter wheel 1A supported by the rotating shaft and rotated. The crucible 3 is processed by pressing at the same time.

In addition, FIG. 6 shows the other addition of the cutter wheel by the shape electric discharge machining. An example of a method of work.

In this method, the jig electrode 7 having the mother die (mother die) 7a having the inverted shape of the portion to be cut is pressed by the blade tip end slopes 2a and 2b of the rotating cutter wheel 1A, thereby performing processing. Department 3.

The above-mentioned wire cutting electric discharge machining and shape electric discharge machining are all immersing the cutter wheel 1A It is carried out as a liquid such as water or oil as a discharge inducing body.

In the above embodiment, although the shape of the crotch portion 3 is formed by a circular arc of a perfect circle, As shown in Figs. 7(a) and 7(b), the side surface on the inclined surface adjacent to the front end portion of the tip end 2 of the obtuse angle blade is formed to be deeper toward the lower side of the inclined surface. Further, in Fig. 7(a), a case where the concavity of the crotch portion 3 is formed shallowly and a case where the concavity is formed deep in Fig. 7(b) is shown. Further, in particular, since the width of the slope of the tip end 2 of the blade in the small-diameter cutter wheel becomes narrow, in such a case, as shown in FIG. 7(c), the side of the jaw portion 3 and the cutter wheel 1 can also be used. 9 is completely continuous.

After the machining of the cutter wheel 1, the width of the front end portion of the front end 2 of the blade can be only By the amount of the crotch portion 3 being cut off, the protrusion portion 13 is adjacently connected as shown in FIG. Even if the width L1 of the scribed path of the 13 is narrow, it can be scored without being in contact with the edge of the protrusion. Further, it is possible to perform the processing of the crotch portion 3 by pressing the wire or the jig electrode serving as the electrode to the bevel of the blade tip by the electric discharge machining of the cutter wheel 1A having the tip end angle of the obtuse angle, so that even the fine portion is processed. The processing can also be easily and accurately produced.

Further, since the portion which is cut by the electric discharge machining does not directly contact the portion of the substrate at the time of scribing, it is not necessary to perform post-processing such as polishing finishing, and it can be used as a product while maintaining the state.

Further, since the front end portion of the front end of the blade retains the obtuse angle of the original cutter wheel 1A, that is, the edge apex of the blade tip end angle, the blade tip end strength necessary for the scribing can be maintained as in the prior art, and the blade edge is passivated. It is difficult to produce and can be used for a long time.

Hereinabove, the representative embodiments of the present invention have been described, but The invention is not necessarily specific to the embodiments described above. For example, in the above-described embodiment, the material which can be electrically processed as the material of the cutter wheel is an example in which the diamond particles are sintered with cobalt or the like and sintered at high temperature and high pressure. Instead of this, a metal material, that is, a superhard alloy is used. Further, a sintered diamond using a diamond particle imparted with conductivity by addition of an impurity or a single crystal diamond or a polycrystalline diamond to which conductivity is imparted by addition of an impurity may be used. Further, in the above embodiment, the blade tip end angle α is set to 105 degrees, but it can be implemented in the range of 90 degrees to 150 degrees. In the other aspects of the invention, it is possible to appropriately modify and change the scope of the invention without departing from the scope of the claims.

The invention can be applied to a brittle material base on a ceramic substrate or a glass substrate The plate, in particular, the cutter wheel used for processing and dividing the mother substrate on which the projection portion is formed on the surface of the substrate.

1‧‧‧Cutter wheel

2‧‧‧ blade front end

3‧‧‧洼

13‧‧‧Protruding

L1‧‧‧ spacing of the protrusions of the mother substrate

L2‧‧‧ left and right width of the front end of the cutter wheel

C‧‧‧ gap

H‧‧‧ Height of the protrusion

S‧‧ scribe

Claims (7)

A cutter wheel is formed by a hard material that can be electrically processed, and an edge of a front end ridge line formed by a left and right inclined surface is an obtuse angle, and the front end portion near the front end ridge line of the blade is an obtuse blade front end. And remaining, and a part of the left and right inclined faces continuing to the front end portion is cut by electric discharge machining, and a trapped portion is formed on the left and right inclined surfaces. For example, the cutter wheel of the first application patent scope, wherein the front end angle of the blade is 90 degrees to 150 degrees. The cutter wheel of claim 1 or 2, wherein the hard material is a superhard alloy or sintered diamond, a conductive single crystal diamond or a polycrystalline diamond. The cutter wheel of claim 1 or 2, wherein the ridge line along the front end of the blade forms a continuous unevenness. The cutter wheel of claim 3, wherein the ridge line along the front end of the blade forms a continuous unevenness. A method of manufacturing a cutter wheel, wherein the cutter wheel is formed by a left and right inclined surface to form a blade front end ridge line, wherein the outer peripheral surface of the disc-shaped disc body formed of the hard-dischargeable hard material is subjected to grinding processing The front end angle of the edge of the front edge of the processing edge is a sloped surface of the obtuse angle; then, the front end portion near the front end ridge line of the blade is set as the front end of the obtuse angle blade and remains, and the left and right sides of the front end portion are cut by electric discharge machining. A portion of the slope forms a trapped portion on the left and right slopes. The method for manufacturing a cutter wheel according to the sixth aspect of the patent application, wherein the front end angle of the blade is 90 degrees to 150 degrees.