JP2001079798A - Metal mold for forming scribing groove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal mold furnished with a blade of a varourable shape to form a scribing groove on a parent material to use to manufacture by cutting and separating a large number of printed boards to load an electronic circuit on from one piece of the parent material. SOLUTION: This metal mold is constituted by engraving a scribing groove to divide a parent material 1 into individual printed boards by bending and cutting it on a surface of the hard parent material 1. In this case, the scribing groove is furnished with a shallow groove part 2a depth of which is uniform and a deep groove part 2b depth of a terminal end part of the shallow groove part 2a is gradually increased, and this metal mold is constituted of a first metal mold furnished with only a flat blade of uniform height to form the shallow groove part 2a and a second metal mold only furnished with a plural number of tip blades head ends of which are pointed which are projectively provided with specified pitches to form the deep groove part 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade suitable for forming a scribe groove on a base material, which is used to cut and separate a printed circuit board on which an electronic circuit is mounted from a single base material. The present invention relates to a mold provided with:

[0002]

2. Description of the Related Art As a material of a printed circuit board for forming an electronic circuit, glass epoxy, alumina, or the like is generally used. There is an increasing demand for downsizing the substrate itself. For example, a small receiver like a pager,
There is a strong demand for miniaturization of printed circuit boards used for block boards of portable wireless devices and the like, memory IC modules as computer-related devices, and the like. As a method of increasing the mass productivity of small printed circuit boards, a large-area flat base material having a shape such as connecting a plurality of boards of the same shape is manufactured in advance,
A method of cutting and dividing the base material into a shape corresponding to each substrate is generally performed. Conventionally, as a means for dividing the base material, a cutting device (shear) that cuts by rubbing two blades together has been used. However, in the production of a relatively soft substrate such as glass epoxy, a cutting device has recently been used. The areas occupied by individual boards are determined by forming perforations made of slits and through holes in a matrix in advance in the matrix, and after completing the formation of wiring patterns on each area, mounting of components, etc. A method of bending and separating at the slit or the like as a boundary is often used. In addition, a high-frequency circuit printed board or a printed board used for high-density mounting electronic devices is often made of a hard material such as alumina, but such a hard board is made of a glass epoxy base material. Since it is difficult to bend and cut at the perforation, a method of forming a continuous groove of a predetermined depth on the surface of the base material and bending and cutting along the groove has been adopted. Such a groove is generally called a scribe groove, and the groove is formed when the alumina base material is relatively soft. FIGS. 6 (a) and 6 (b) are a front view and a plan view of an alumina base material having a scribe groove proposed by the present applicant, and show the depth of the terminal portion 2a of the scribe groove 2 formed on the surface of the base material 1. Is set to be larger than the depth of the central portion 2b. On the surface of a base material 1 made of a hard material such as alumina, scribe grooves 2 for partitioning each substrate region 3 are formed in a lattice pattern, and intersections of the scribe grooves 2 extending vertically and horizontally, that is, end portions of the scribe grooves. 2a is inclined so that the depth gradually increases toward the outside.

The conventional scribe groove is only a V-groove having a uniform depth over the entire length, so that when a base material is divided along the scribe groove, a base material portion immediately below the scribe groove is formed. It was difficult to crack vertically (perpendicular to the base material surface). In particular, the ends of the grooves in the longitudinal direction (particularly, the intersections of the vertical and horizontal scribe grooves) were broken into irregular shapes, and skirt-shaped burrs were likely to remain. Substrates having burrs at the edges cause various inconveniences not only in the subsequent processing steps but also in the incorporation into equipment, so that burrs must be eliminated. On the other hand, in the scribe groove shown in FIG. 6, since the depth of the end portion, particularly the crossing portion of each of the vertical and horizontal scribe grooves, is gradually increased, the crack shape at the end portion is surely made to be a vertical surface. can do. By the way, when the scribe grooves 2 are formed on the surface of the base material 1 made of a hard material such as alumina, a mold as shown in FIG. 7 has been used.
The mold 5 has a configuration in which blades 7 are projected in a grid pattern vertically and horizontally on the lower surface of a base plate 6 having an area sufficient to cover the upper surface of one base material 1. The blade 7 is a means for collectively forming a scribe groove 2 having a central portion (shallow groove portion) 2a having a uniform depth and a terminal portion (deep groove portion) 2b having a gradually increasing depth. A flat blade portion 7a for forming a central portion 2a having a uniform depth, and a pointed blade 7b for forming a terminal portion 2b having a gradually increasing depth. Specifically, it has a configuration in which pointed blades 7b are protruded at a predetermined pitch from the blade edge of the flat blade portion 7a. The mold 5 having such a configuration has a disadvantage that the blade 7 has a complicated configuration, so that the processing work for manufacturing the blade 7 is complicated and the cost is increased. In addition, the pointed blade 7b protruding from the flat blade 7a is easily damaged, and if the pointed blade 7b is broken at any one place, it is necessary to replace the entire blade 7 with a new one, so that the operation rate is reduced and the productivity is reduced. Was easy to decrease.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has been made in view of the above, and is provided with a scribe groove used to cut and separate a large number of printed circuit boards on which electronic circuits are mounted from a single base material. It is an object of the present invention to provide a metal mold having a blade having a shape suitable for forming a metal sheet on a base material. More specifically, it is a mold provided with a blade suitable for forming a scribe groove composed of a shallow groove portion having a uniform depth and a deep groove portion in which the depth of the terminal portion of the shallow groove is gradually increased. In addition to simplifying the shape of the blade and reducing the manufacturing cost, even if the pointed blade for forming the deep groove is broken, it can be easily repaired by replacing only the damaged pointed blade. Is provided.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a scribe groove is formed on a surface of a hard base material by bending and cutting the base material to divide it into individual substrates. A mold for setting the scribe groove,
It is provided with a shallow groove part having a uniform depth and a deep groove part in which the depth of the terminal part of the shallow groove part is gradually increased, and the mold is only a flat blade having a uniform height for forming the shallow groove part. The first with
And a second mold having only a plurality of pointed blades, each of which has a pointed tip and protrudes at a predetermined pitch to form the deep groove portion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings. FIGS. 1 (a) and 1 (b) are explanatory views of the structure of a first mold constituting the mold of the present invention.
FIG. 2C is a cross-sectional view showing the shape of the carved shallow groove, FIG.
2 (b) is an explanatory view of the configuration of the second mold, and FIG. 2 (c) is a sectional view showing the shape of the engraved deep groove. In addition, the parent material to be processed is also referred to in FIG. The mold of the present invention is a means for forming a scribe groove on the surface of a hard base material by bending and cutting the base material to divide the substrate into individual substrates, as shown in FIG. The scribe groove 2 engraved on the surface of the base material 1 includes a shallow groove portion 2a having a uniform depth, and a deep groove portion 2b in which the depth of the terminal portion of the shallow groove portion is gradually increased. The mold of the present invention is composed of two molds each having a blade having a different shape. Immediately after forming the shallow groove 2a on the base material surface before hardening by the flat blade provided in the first mold, By forming the deep groove portion 2b with the pointed blade provided in the second mold, the operation of engraving the scribe groove as shown in FIG. 6 is completed. That is, FIG.
The first mold 10 shown in (b) is arranged in a grid on the one surface 12 of the base plate 11 and the base plate 11 having an area sufficient to cover one surface of the base material 1 to be processed. Flat blade 13
And Each flat blade 13 has a shape sufficient to cut the shallow groove 2a in the base material surface when the first mold 10 is pressed against the base material surface, that is, has a predetermined height, length and thickness. Further, each flat blade 13 is arranged vertically and horizontally so that the shallow groove portion 2a can be carved in a lattice shape. Further, as shown in FIG. 1C, by pressing the flat blade 13 on the surface of the base material 1 before hardening, a shallow groove portion 2a having a uniform depth is formed on the base material 1.

The second mold 2 shown in FIGS. 2 (a) and 2 (b)
Reference numeral 0 denotes a base plate 21 having an area sufficient to cover one surface of the base material 1 to be processed, and a deep groove portion 2b of a scribe groove.
And a conical pointed blade 23 protruding from one surface 22 of the base plate 21 corresponding to. The position where each pointed blade 23 protrudes is, of course, a position corresponding to the intersection of the lattice-shaped shallow groove 2 a formed on the base material 1 by the flat blade 13 of the first mold 10. The shape of the pointed blade 23 is such that each deep groove 2b can be engraved when the second mold 20 is pressed onto the base material. The deep groove 2b formed on the base material by the conical pointed blade 23 has a sectional shape as shown in FIG. 2 (c) and a planar shape as shown in FIG. 2 (d). The cross-sectional shape of the scribe groove 2 shown in FIG.
The reason why the shape slightly differs from that shown in FIG. 5 is that the shape of the pointed blade 23 used is different. Instead of making the pointed blade 23 a conical shape, if the pointed blade shape shown in FIG.
A groove shape as shown in FIG. 6 can be obtained.

FIGS. 3, 4 and 5 show an example of the shape of the pointed blade 23 and the shape of a deep groove formed on the base material by each pointed blade, respectively. FIG. 3 shows a polygonal pyramid (quadrangular pyramid) shape. FIG. 4 shows a shape in which two isosceles triangular blades are orthogonal to each other, and FIG.
Are pointed blades each having a hemispherical shape. Since the shape of each pointed blade 23 is transferred almost directly onto the base material, it is needless to say that each pointed blade 23 is selected according to the shape of the intended deep groove portion 2b of the scribe groove. Note that the polygonal pyramid-shaped pointed blade shown in FIGS. 3A and 3B includes a triangular pyramid, a rhombus pyramid, and the like. In addition, it is also possible to further reduce the burr generation rate at the time of dividing the base material by forming small grooves 30 on the back surface of the base material 1 that face the tops of the deep grooves 2b. 30 may be formed using a third mold (not shown) provided with a pointed blade suitable for forming 30. In addition, when each of the pointed blades 23 is detachably attached to the base plate 21, the second mold 20 is repaired by replacing only the damaged pointed blade when some of the pointed blades are damaged. It is easy and convenient to reuse. As described above, the present invention provides a scribe groove in which the depth of the end portion of the scribe groove for bending and cutting is made deeper than the other portion (the central portion), and is further inclined gradually outward. When forming on a base material, the process is performed in two stages instead of a conventional single mold (a mold for collective formation) which has a complicated structure and is not easily repaired once broken. Since one mold is used, the structure of each mold is simplified to facilitate repair when the blade is broken,
Die cost can be reduced. The base material provided with the scribe grooves formed in this way, when bent along the scribe grooves, the end portions of the grooves can be cut perpendicularly to the substrate surface, similarly to the center portion, The formation of skirt-shaped burrs can be prevented.
In addition, since the other groove portions except the terminal portion are set to the appropriate depth as before, sufficient strength is maintained, and the load applied to the base material during processing and transfer to the base material It does not bend or cut from the scribe grooves. The base material to be cut by the mold of the present invention is not limited to the alumina base material. Therefore, the present invention can be applied to all cases where scribe grooves are formed in a hard base material such as glass or quartz.

[0009]

As described above, according to the present invention, it is possible to cut and separate a large number of printed circuit boards on which electronic circuits are mounted from a single base material without increasing the cost of the mold. A mold provided with a blade having a shape suitable for forming a scribe groove to be used on a base material can be provided. Specifically, a mold provided with a blade suitable for forming a scribe groove composed of a shallow groove portion having a uniform depth and a deep groove portion in which the depth of the terminal portion of the shallow groove portion is gradually increased. By using two molds that perform the process in two stages, the shape of the blade is simplified, the manufacturing cost is reduced, and the pointed blade for forming the deep groove is damaged even if the pointed blade is damaged. A mold that can be easily repaired by exchanging only the mold can be provided.

[Brief description of the drawings]

1 (a) and 1 (b) are explanatory diagrams of the configuration of a first die constituting a die of the present invention, and FIG. 1 (c) is a cross-sectional view showing the shape of a carved shallow groove.

FIGS. 2 (a) and 2 (b) are explanatory diagrams of a configuration of a second mold, and FIG.
Is a cross-sectional view showing the shape of the engraved deep groove, and (d) is a plan view.

3 (a) and 3 (b) are a cross-sectional view and a plan view showing the shape of a deep groove formed on a base material by a pointed blade having another shape.

4 (a), (b) and (c) are perspective views of a pointed blade having another shape, a sectional view showing a shape of a deep groove formed on a base material by the pointed blade, and a plan view. .

FIGS. 5A and 5B are a cross-sectional view and a plan view showing a shape of a deep groove formed on a base material by a pointed blade having another shape.

FIGS. 6 (a) and (b) are a front view and a plan view of an alumina base material having scribe grooves proposed by the present applicant.

FIG. 7 is an explanatory view of a conventional mold.

[Explanation of symbols]

Reference Signs List 1 base material, 2 scribe grooves, 2a shallow groove portion, 2b deep groove portion, 10 first die, 11 base plate, 12 one surface of base plate, 13 flat blade, 20 second die, 21 base plate, 22 base One side of the plate, 23 pointed blade.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yoshiaki Sato 2-1-1 Kotani, Samukawa-cho, Koza-gun, Kanagawa F-term in Toyo Tsushinki Co., Ltd. (reference) 3C060 AA11 BA07 BB07

Claims (1)

[Claims] 1. A mold for engraving a scribe groove on a surface of a hard base material by bending and cutting the base material to divide the substrate into individual substrates, wherein the scribe groove has a depth of Has a uniform shallow groove portion, and a deep groove portion in which the depth of the terminal end portion of the shallow groove portion is gradually increased. The mold has only a flat blade having a uniform height for forming the shallow groove portion. A first mold, and a second mold having only a plurality of sharpened blades, each of which has a sharp tip protruding at a predetermined pitch to form the deep groove portion. Die for forming scribe grooves.