JPH11204915A - Substrate dividing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attempt miniaturization and improvement of durability of a driving device which is provided with upper cutting blades projecting downwards and lower ones having holes which can fix with the cutting blades, by dividing into substrate units by differentiating the cutting blade heights and into each cutting blade height having more difference than the thickness of the original substrate. SOLUTION: Each required number of first cutting blades 16 and second cutting blades, for example seven each, having longitudinal prism shapes are so provided as projecting toward the lower perpendicular direction on the lower surface of an upper disc 3. A difference h1 -h2 between the higher height h1 of the first cutting blades 16 and the height h2 of the second cutting blades 17 is set as a bigger predetermined value than the thickness of an original substrate 8. Additionally each first and second cutting blade 16 and 17 is so arranged as to pressurize the original substrate in a proper balance. The maximum cutting power while cutting a bridge between each unit substrate can be reduced and a required pressure of a driving device can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board dividing apparatus for dividing a printed circuit board used in an electronic apparatus from a multi-faced state into a single body by a pressing force of a driving device.

[0002]

2. Description of the Related Art A printed circuit board is divided into single substrates after a plurality of circuits having the same pattern are formed on a single original plate to form a multi-faced state. One of the devices for performing such division is a substrate dividing device.

A conventional substrate dividing apparatus will be described below with reference to FIGS.

The substrate dividing apparatus has an upper mold 1 and a lower mold 2. The upper die 1 has a flat rectangular parallelepiped upper plate 3, a columnar support 4 fixed to the center of the upper surface of the upper plate 3, and a required number of shearing blades provided on the lower surface of the upper plate 3. 5, and can be moved up and down by a driving device (not shown).
The shearing blades 5 have a vertically long prismatic shape, and the heights of the respective shearing blades 5 are equal.

The lower die 2 is provided with a required number (9 in the figure) of square holes 6 into which the shearing blades 5 can be fitted.
Is polymerizable with the lower mold 2. Also, the lower mold 2
Escape holes 7 to avoid interference with mounted parts
Are provided for each single substrate.

The original plate 8 is provided with a plurality of (two in the figure) single substrates 9 on which a circuit of the same pattern is formed, and a slit hole is formed around the single substrate 9. A plurality of (9 in the figure) bridges 10 are left, and the single substrate 9 is integrated with the original plate 8.

[0007] The original plate 8 is placed on the lower die 2 and positioned. When positioned, the bridge 10 is aligned with the square hole 6. The driving device (not shown) is driven to lower the upper die 1. The respective shearing blades 5 simultaneously contact the original plate 8 to shear the respective bridges 10,
After shearing, it is fitted into the square hole 6. Each of the bridges 10 is punched from the original plate 8 and a plurality of the bridges 10 (two
) Are divided into the single substrates 9.

At this time, n bridges 10 are provided, and the force required to shear each bridge 10 is P
_Assuming that ₁ , P ₂ ,..., P _n , the required pressure W of the driving device (not shown) is determined so as to satisfy Equation 1.

[0009]

[Formula 1] W ≧ S × (P ₁ + P ₂ +... + P _n ) S: safety factor

In the above-described conventional substrate dividing apparatus, it is necessary to increase the pressing force of the driving device (not shown) as the number of the bridges 10 increases. There was a possibility that the scale would increase.

When the shearing of each of the bridges 10 is started simultaneously by all of the shearing blades 5, the pressing force acting on the lower mold 2 via the original plate 8 increases, and as shown in FIG. There is a possibility that a crack 12 may occur in a portion 11 having low strength between the hole 6 and the escape hole 7.

The present invention has been made in view of the above circumstances and aims at reducing the size of the driving device and improving the durability of the lower die 2.

[0012]

According to the present invention, there is provided an upper mold having a plurality of shearing blades projecting downward, and a lower mold having a hole into which the shearing blades can be fitted. The present invention relates to a substrate dividing device having a different height, and also relates to a substrate dividing device in which a difference in height between the respective shearing blades is equal to or larger than a thickness of an original plate to be divided.
The present invention relates to a substrate dividing apparatus in which shear blades having different heights are uniformly arranged, and the shear blades having higher heights are sequentially fitted into holes to divide a single substrate from an original plate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

On the lower surface of the upper platen 3, first and second shearing blades 16 each having a vertically long rectangular column shape are provided in a required vertical direction (seven in the figure) in the downward vertical direction. The height of the first shear blade 16 is higher than the height of the second shear blade 17,
Assuming that the height of the first shearing blade 16 is h ₁ and the height of the second shearing blade 17 is h ₂ , the first shearing blade 16 and the second
The height difference h ₁ -h ₂ from the shearing blade 17 is set to be larger than the thickness of the original plate 8 by a predetermined value. In addition, the first
The shearing blades 16 and the second shearing blades 17 are arranged evenly so that they can be pressed against the original plate 8 with good balance. For example, it is vertically symmetrical with respect to the center line 18 connecting the bridges 10 between the individual substrates 9 in FIG. 2, or the center of action of the force of the total pressing force of the first shearing blade 16 and the second shearing blade 17 The center of action of the force of the total pressing force coincides with the center of gravity of the original plate 8, or the center of action of each force coincides with the axis of the shaft supporting the upper die 1, so that a large eccentric load is applied to the original plate 8. The upper mold 1 is arranged so as not to be hung and no bending moment acts on the upper mold 1.

The operation will be described below.

The original plate 8 is placed on the lower die 2 and positioned. When positioned, the bridge 10 is aligned with the square hole 6. When the upper die 1 is lowered by a driving device (not shown), the tips of the first shearing blades 16 simultaneously contact the bridges 10 corresponding to the respective first shearing blades 16, and the shearing of the bridges 10 is stopped. Started (Figure 3
(A)). During the shearing of the bridge 10, the bridge 1
The shear force acting on zero reaches a maximum value A as shown in FIG. When the tip of the first shear blade 16 reaches the lower surface of the original plate 8, the bridge 10 corresponding to the first shear blade 16
Is punched from the original plate 8 and the shearing force becomes zero (see FIG. 3).
(B)).

Further, when the upper die 1 is lowered, the tip of each of the second shearing blades 17 simultaneously comes into contact with the bridge 10 corresponding to each of the second shearing blades 17, and shearing of the bridge 10 is started. (See FIG. 3C). The shearing force when shearing the bridge 10 reaches the maximum value A again as shown in FIG. When the tip of the second shear blade 17 reaches the lower surface of the original plate 8, the bridge 1 corresponding to the second shear blade 17
0 is punched from the original plate 8, the shearing force becomes zero (see FIG. 3D), and the single substrate 9 is separated from the original plate 8.

As described above, the driving device (not shown)
Is calculated and determined based on the maximum value of the shearing force when the bridge 10 is sheared. Further, the maximum value A of the shearing force when shearing the bridge 10 is half the maximum value B of the shearing force when all the shearing blades simultaneously shear all the bridges 10 as shown in FIG. . Thus,
The pressure required for the drive is half that required when all shear blades shear all the bridges 10 at the same time.

In the above embodiment, two types of first shearing blades 16 and second shearing blades 17 having different heights are provided, but three or more types may be provided. It goes without saying that the maximum value of the shearing force for shearing 10 can be further reduced.

The first shearing blade 16 and the second shearing blade 17
Is set to be larger than the thickness of the original plate 8 by a predetermined value, but may be set to be equal to the thickness of the original plate 8.

[0021]

As described above, according to the present invention, since the maximum value of the shearing force when shearing the bridge can be reduced, the required pressure of the driving device can be reduced, and the entire device can be reduced. It is possible to reduce the size.

Further, the pressing force acting on the lower mold via the original plate can be reduced, and the shearing blades having different heights are uniformly arranged so that the shearing force at the time of shearing is dispersed. There is less possibility that cracks or the like are generated, and various excellent effects such as improvement in durability of the lower mold can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view of an upper die according to an embodiment of the present invention.

FIG. 2 is a bottom view of the upper die according to the embodiment.

FIGS. 3 (a), (b), (c), and (d) are side cross-sectional views each showing an operation state of the upper die according to the embodiment.

FIG. 4 is a diagram showing a relationship between a descending stroke of a shearing blade and a shearing force acting on an original plate in the embodiment.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a partial side sectional view showing a conventional example.

FIG. 7 is a perspective view showing the operation of the conventional example.

FIG. 8 is a side view showing a conventional example.

FIG. 9 is a perspective view showing a case where a crack occurs in a lower mold in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper die 2 Lower die 6 Square hole 8 Original plate 9 Single substrate 10 Bridge 16 First shear blade 17 Second shear blade

Claims (3)

[Claims] 1. An upper mold having a plurality of shearing blades projecting downward, and a lower mold having a hole into which the shearing blades can be fitted,
A substrate dividing device, wherein the height of the shearing blade is different. 2. The substrate dividing apparatus according to claim 1, wherein a difference between the heights of the respective shearing blades is equal to or greater than a thickness of the original plate to be divided. 3. The substrate dividing apparatus according to claim 1, wherein shear blades having different heights are evenly arranged.