JP3783528B2 - Cutting method of molded circuit board - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting method for individually separating a plurality of molded circuit boards formed by multi-cavity.
[0002]
[Prior art]
A molded circuit board (also referred to as a MID: Molded Interconnect Device, a three-dimensional circuit board) is a part necessary as a circuit by performing, for example, laser processing on a copper thin film formed by a copper sputtering method on an injection molded product. A three-dimensional electrical wiring pattern is formed by separating unnecessary parts and plating only the necessary parts as a circuit by electroplating, which is generally used for devices that require ultra-miniaturization. ing.
[0003]
For this reason, the molded circuit board is formed by taking multiple pieces at the time of injection molding, and the circuit pattern is formed in a state in which a plurality of connected circuit boards are connected. Separated into each molded circuit board.
[0004]
[Problems to be solved by the invention]
Here, since the molded circuit board is extremely small as described above, at the time of separation by cutting a workpiece formed in a large number of pieces, a plurality of blades are simultaneously cut with a plurality of blades while holding each molded circuit board. However, the current situation is that the workpiece is cut one by one while shifting the holding position, and this requires a considerable amount of time for the cutting process.
[0005]
The present invention has been made in view of such a point, and the object of the present invention is to easily respond to simultaneous cutting with a plurality of blades of a plurality of workpieces in a state of being formed by multiple cutting. It is in providing the cutting method of a molded circuit board.
[0006]
[Means for Solving the Problems]
Accordingly, the present invention provides a water filled with a jig fixed with a workpiece set on a tray-type jig when a workpiece formed by integrally molding a plurality of molded circuit boards is cut and separated into individual molded circuit boards. In the method for cutting a molded circuit board in which the workpiece is cut in this state, the jig is brought into contact with the hot plate and then set on the chuck for fixing to the cutting machine. It has characteristics. In the present invention, it is only necessary to cut the whole ice fixing the workpiece to the jig, and the workpiece holding member does not obstruct the cutting . And after making a jig | tool contact a hot plate and melting frost, a jig | tool can be set to a chuck | zipper.
[0007]
Further, in the present invention, when a work formed by integrally molding a plurality of molded circuit boards is cut and separated into individual molded circuit boards, water filled in the jig is fixed to the work set on a tray-type jig. In the method of cutting a molded circuit board, which is performed by freezing and cutting the workpiece in this state, after blowing dry air on the outer surface of the jig, the jig is set on a chuck for fixing to the cutting machine have. In the present invention, it is only necessary to cut the whole ice fixing the workpiece to the jig, and the workpiece holding member does not obstruct the cutting. And before setting to a chuck | zipper, it can dry by spraying dry air on the outer surface of a jig | tool.
[0008]
Further, in the present invention, when a work formed by integrally molding a plurality of molded circuit boards is cut and separated into individual molded circuit boards, water filled in the jig is fixed to the work set on a tray-type jig. In the method of cutting a molded circuit board in which the workpiece is cut in this state by freezing, after removing the outer surface material previously mounted on the outer surface of the jig, the jig is attached to the chuck for fixing to the cutting machine. It has a feature in setting. In the present invention, it is only necessary to cut the whole ice fixing the workpiece to the jig, and the workpiece holding member does not obstruct the cutting. Then, when setting the chuck, the outer surface material is peeled off so that the dried jig surface can come into contact with the chuck.
[0009]
Furthermore, it is preferable to use a jig having a water-repellent coating on the outer surface as the jig in order to suppress adhesion of frost.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on an example of the embodiment. FIG. 2 shows a workpiece 1 to be cut by the cutting method according to the present invention. By cutting along the cutting line L, a total of four pieces are shown. The molded circuit board 10 can be obtained. In the illustrated example of the molded circuit board 10, the lens barrel 11 on which a lens or the like is to be set protrudes from the lower surface side, and a circuit pattern is formed on the upper surface side.
[0011]
When cutting the workpiece 1, as shown in FIG. 1, the workpiece 1 is set on the jig 2 formed in a tray shape, and water is poured into the jig 2. Thereafter, the workpiece 1 is put in the freezer 4. By doing so, the water in the jig 2 is frozen to fix the workpiece 1 to the jig 2, and in this state, the jig 2 is set on a cutting machine and cut. After cutting, the molded circuit board 10 is taken out by thawing and washing by blowing high-pressure hot water or the like.
[0012]
The jig 2 holds a plurality of workpieces 1 in an aligned state and holds the molded circuit board 10 in a predetermined position even after the workpieces 1 are separated into individual molded circuit boards 10 by cutting, for example, In the case where the molded circuit board 10 has a cylindrical lens barrel portion 11 as shown in FIG. 2, the molded circuit board 10 has a portion surrounding the outer periphery of the lens barrel portion 11 and the molded circuit board 10 is displaced after cutting. What is prevented from being lost can be suitably used. The jig 2 is preferably provided with pilot pins (not shown) that are inserted into pilot holes 13 provided in the work 1 in advance to position the work 1 with respect to the jig 2.
[0013]
Here, when water put in the jig 2 is frozen, bubbles may be formed on the lower surface side of the workpiece 1. If cutting is performed at a portion where such air bubbles are present, burrs are formed on the molded circuit board 10, so water must be poured so that no air bubbles are generated. From this point, as shown in FIG. 3, water is poured into the jig 2 by simultaneously pouring water from a plurality of nozzles 25 or by inserting the nozzles 25 at locations where bubbles are likely to be generated due to difficulty in turning water. It is preferable to perform.
[0014]
Also, water is not poured after the workpiece 1 is set on the jig 2, but the workpiece 1 is set on the jig 2 after the jig 2 is filled with water, or the jig 2 and the workpiece 1 are previously watered. Generation | occurrence | production of an air bubble can also be suppressed by carrying out wet setting and performing the setting of the workpiece | work 1 to the jig | tool 2, and water injection after this.
[0015]
As the jig 2, a jig that has a water passage hole and can be poured from the bottom of the jig 2 through the water passage hole is used, or the jig 2 is placed on a vibration table to vibrate the jig 2. It is also preferable to pour water while feeding.
[0016]
In addition, as water poured into the jig 2, water from which SiO ₂ has been removed, for example, distilled water is used. This is because SiO ₂ causes a stain on the molded circuit board 10. Moreover, the time required for the freezing process which freezes this water can be reduced by using the water cooled to near freezing point beforehand.
[0017]
If the work 1 is set on the jig 2 and water is injected, the work 1 is fixed to the jig 2 by freezing the water in the freezer 4 next time. 1 may be pushed up and shifted from a predetermined position. In order to prevent this, the temperature of the workpiece 1 is set lower than the temperature of the jig 2 in advance so that water freezes from the workpiece 1 side, or a presser having a cutting guide groove 27 as shown in FIG. It is preferable to freeze the work 1 while pressing the work 1 against the jig 3 with the frame 26. In this case, it is preferable that the holding frame 26 is also fixed to the jig 1 with ice. The temperature in the freezer is preferably -5 ° C to -15 ° C, which is a preferable condition for fixing the work 1 with ice. In addition, you may make it use the jig | tool 2 in which the surface which sets the workpiece | work 1 at least was formed with ice.
[0018]
As the chuck 7 for fixing the jig 2 to the cutting machine, a freezing chuck 7 that can cool the temperature to below the freezing point while the upper surface is the positioning mounting surface of the jig 2 is preferably used. Can do. Cooling may be performed by a Peltier element, a separate refrigerant as shown in FIG. 7, or a combination of a refrigerant and Peltier element 70 as shown in FIG. Although the refrigerant in the former case is about −15 ° C., the refrigerant in the latter case is for cooling the heat radiating side of the Peltier element 70, and may be about 5 ° C.
[0019]
If such a refrigeration chuck is used, cooling can be performed even during cutting, so that it is possible to suppress melting of ice due to heat and time that are generated during cutting. Although the freezing of the water itself may be performed by the freezing chuck 7, it takes time in terms of capacity. Therefore, the jig 2 on which the work 1 is set is cooled in the freezer 4 to freeze the water in advance. It is preferable to set it on the freezing chuck 7 after that. Further, in the case of using the Peltier element 70, it can be solved by reversing the current flowing through the Peltier element 70 when the jig 2 described later is frozen.
[0020]
By the way, when it is set in the chuck 7 of the cutting machine after freezing water in the freezer, it is frost adhering to the outer surface of the jig 2 regardless of whether the chuck 7 is a freezing chuck or not. . This is because the presence of such frost causes a shift in the setting position of the jig 2 to the chuck 7.
[0021]
For this purpose, a jig 2 having a water-repellent coating on its outer surface, that is, one in which frost is difficult to adhere is used, or a heater 23 (as shown in FIG. 5A) is used. The heater 23 is operated before being set on the chuck 7 using the jig 2 provided with an electric heater wire (or a heating medium flow path as shown in FIG. Then, the frost is melted or the jig 2 is brought into contact with the hot plate 24 to melt the frost as shown in FIG.
[0022]
When a freezing chuck is used as the chuck 7, the melted frost freezes again and it is difficult to remove the jig 2 from the freezing chuck 7 after cutting. Therefore, the outer surface of the jig 2 is set before the freezing chuck 7 is set. Dry air by spraying it onto the surface of the jig 2 or by attaching an external material to the outer surface of the jig 2 in advance so that frost adheres to the surface of the external material. The surface of the jig 2 peeled off and dried may be in contact with the freezing chuck 7. It is also preferable to set the jig 2 after applying the antifreeze liquid to the surface of the freezing chuck 7.
[0023]
In addition, when the chuck 7 is a freezing chuck, the jig 2 is fixed by vacuum suction (see FIG. 7), and the jig 2 is removed after cutting by using compressed air between the surface of the chuck 7 and the jig 2. What supplies and extrudes the jig | tool 2 can be used suitably. Even if the jig 2 is frozen on the surface of the chuck 7, the jig 2 can be easily removed. Alternatively, the jig 2 may be removed by blowing air having a temperature higher than room temperature to the frozen jig 2 to melt ice. In addition, a mechanical external force such as inserting a wedge between the frozen jig 2 and the chuck 7 or forcibly rotating the jig 2 with respect to the chuck 7 may be used. Of course, these may be used in combination.
[0024]
Next, cutting is performed with a metal saw 8 (or a rotating grindstone) that is a rotary blade, but the work 1 is fixed to the jig 2 with ice, and the ice may be cut together with the work 1. For the cutting, there is no problem even if a plurality of places are simultaneously cut using a cutting machine to which a plurality of metal saws 8 are attached at predetermined intervals. However, if the heat generated by the cutting melts the ice and reduces the fixing ability of the workpiece 1, the cutting position is displaced, or the workpiece 1 cannot be tilted to perform a predetermined cutting. Therefore, it is possible to cut while blowing cold air, preferably cold air below the freezing point, to the cutting work part, or cutting while applying antifreeze liquid below the freezing point to the cutting part. It is preferable that the water is frozen again.
[0025]
If the chuck 7 is a freezing chuck and can be cooled during cutting, the cutting may be performed while pouring cold water into a groove formed by the cutting. Even in this case, the water flowing into the cut portion is frozen again, so that the workpiece 1 can be reliably fixed with ice until the cutting is completed.
[0026]
If the cutting itself with the metal saw 8 which is a rotary blade is performed under the conditions of a peripheral speed of 100 to 500 m / min and a single blade feed amount of 3 to 20 μm / rev, a satisfactory cutting can be performed. When the cutting line is not a straight line, it may be cut with an end mill instead of the metal saw 8. In any case, at the time of this cutting, the cutting of the blade with respect to the molded circuit board 10 is a down cut that enters from the circuit pattern side. By doing in this way, a possibility that a circuit pattern may float or peel from the molded circuit board 10 can be reduced.
[0027]
After cutting, the jig 2 is removed from the chuck 7 and sprayed with high-pressure hot water to melt the ice and clean as described above. At this time, as shown in FIG. If a bowl-shaped inner frame 2a to be set and a tray-shaped outer frame 2b capable of accommodating the inner frame 2a are used, the outer frame 2b to the inner frame after completion of cutting. As shown in FIG. 10, high-pressure hot water can be sprayed in a state where the upper surface of the inner frame 2a is covered with a net 2c, as shown in FIG. That is, the cleaning operation can be performed without transferring the cut molded circuit board 10 to another cleaning jig. Further, if the cleaning is performed with the net 2c covered, the molded circuit board 10 stays at a predetermined position on the inner frame 2a without ejecting from the inner frame 2a even when the cleaning water is ejected from below. The circuit board 10 can also be flown while being set on the inner frame 2a in the inspection process. In addition, 9 in FIG. 10 is a spray nozzle, 90 is a conveyance wheel.
[0028]
【The invention's effect】
As described above, in the present invention, when cutting a workpiece formed by integrally molding a plurality of molded circuit boards and separating them into individual molded circuit boards, the workpiece set on the tray-type jig is fixed to the jig. Since the work is cut in this state by freezing the filled water, the work can be cut with the ice that is fixing the work to the jig. There is no hindrance to cutting, and for this reason, there is no problem with simultaneous cutting at a plurality of points by a large number of blades, and the time required for the cutting process can be shortened.
[0029]
And when setting a jig | tool to a chuck | zipper, after making a jig | tool contact a hot plate, the influence of frost can be avoided by setting a jig | tool to a chuck | zipper.
[0030]
Also, after dry air is blown onto the outer surface of the jig, the jig is set on the chuck, or the outer surface material previously mounted on the outer surface of the jig is peeled off, and then the jig is set on the chuck. In this case, it is possible to avoid freezing of the jig to the chuck.
[0031]
Further, when a jig whose outer surface has a water repellent coating is used as the jig, adhesion of frost to the outer surface of the jig can be suppressed, and the jig can be accurately fixed during cutting.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of an embodiment of the present invention.
FIGS. 2A and 2B show an example of the workpiece, wherein FIG. 2A is a plan view and FIG. 2B is a front view.
FIG. 3 is a perspective view showing an example of the water injection work same as above.
FIG. 4 is a perspective view of an example of the workpiece presser according to the embodiment.
FIGS. 5A and 5B are explanatory views showing a heater provided on a jig. FIG.
FIG. 6 is a perspective view showing heating for defrosting the outer surface of the jig.
FIG. 7 is an explanatory diagram of an example of a freezing chuck.
FIG. 8 is an explanatory diagram of another example of the freezing chuck.
FIGS. 9A and 9B show an example of a jig, where FIG. 9A is a plan view and FIG. 9B is a cross-sectional view.
FIG. 10 is a cross-sectional view showing a cleaning process.
[Explanation of symbols]
1 Work 2 Jig 4 Freezer 8 Metal Saw

Claims (4)

When cutting a workpiece formed by integrally molding multiple molded circuit boards and separating them into individual molded circuit boards, the work set on a tray-type jig is fixed by freezing the water filled in the jig. In the method for cutting a molded circuit board for cutting a workpiece in this state, the jig is set on a chuck for fixing to a cutting machine after the jig is brought into contact with the hot plate. Cutting method. When cutting a workpiece formed by integrally molding multiple molded circuit boards and separating them into individual molded circuit boards, the work set on a tray-type jig is fixed by freezing the water filled in the jig. In the method of cutting a molded circuit board for cutting the workpiece in this state, after the dry air is blown to the outer surface of the jig, the jig is set on a chuck for fixing to the cutting machine Cutting method. When cutting a workpiece formed by integrally molding multiple molded circuit boards and separating them into individual molded circuit boards, the work set on a tray-type jig is fixed by freezing the water filled in the jig. In the method of cutting a molded circuit board that cuts the workpiece in this state, the jig is set on a chuck for fixing to a cutting machine after peeling off the outer surface material previously mounted on the jig outer surface. A method for cutting a molded circuit board. The method for cutting a molded circuit board according to any one of claims 1 to 3, wherein a jig having a water-repellent coating on the outer surface is used as the jig .

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