JP2897602B2 - Die stamping mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die stamp die for cutting only a metal foil of an FPC substrate into a predetermined circuit pattern.

[0002]

2. Description of the Related Art Conventionally, when a flexible circuit board is produced by a die stamping method, as shown in FIG. FPC [Fle
xible Printed Circuit] A base material A is formed, and the metal foil c of the FPC base material A is punched and cut as shown in FIG. I do.

At this time, the mold 50 is heated in advance, and as shown in FIG. 7, when the press contact surface 52 is pressed against the metal foil c, the adhesive just under the press contact surface 52 is interposed via the metal foil c. b is cured, the metal foil c in the portion where the adhesive b is cured is temporarily bonded to the base film a, and the metal foil c in the portion where the adhesive b is not cured remains in a state where it can be peeled off from the base film a. Become.

[0004] Next, as shown in FIG. 8, a portion of the metal foil c where the adhesive b has not been cured is peeled and removed, and a predetermined circuit pattern cut by a mold 50 is formed on the base film a. The metal foil c remains, and the adhesive b in the lower layer of the remaining metal foil c is further heated and cured, the metal foil c is completely fixed to the base film a, and the cover lay film is further adhered to the upper surface. Thus, the manufacture of the flexible circuit board having the predetermined circuit pattern is completed.

As a mold used in the above-described die stamping method, there is a rotary mold 60 shown in FIG. 9 in addition to a flat mold such as the mold 50 described above.

[0006] This rotary type mold 60 is obtained by directly shaving a blade 63 by milling a cylindrical shaft 61 having a pillow 62 that comes into contact with the ambiroll B and then sharpening the same. The metal foil is cut by sandwiching an FPC base material between 61 and Ambiroll B.

[0007]

By the way, the blade 63 of the above-mentioned rotary mold 60 is appropriately formed on the shaft 61 in accordance with the circuit pattern to be cut. Usually, as shown in FIG. The rotation axis j of the mold 60
Are often formed at right angles or in parallel to.

Therefore, when the circuit pattern to be cut is elongated as shown in FIG. 10, the diameter of the shaft 61 is increased as shown in FIG. The width must be increased, and various problems such as an increase in the size of the equipment, an increase in the cost of the mold, and an increase in the labor for replacing the mold have occurred.

Further, the blade 63 formed parallel to the rotation axis j of the mold 60 is easily broken by the rotation of the mold 60, so that the product yield is reduced and the mold 60 is repaired or replaced. There is also a problem that the maintenance cost of the equipment increases.

Accordingly, an object of the present invention is to provide a die stamp die which does not cause problems such as an increase in equipment size and an increase in die cost even in the case of an elongated circuit pattern, and which is less likely to damage the blade. It is in.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a column-shaped blade formed by forming a blade portion on an outer peripheral surface of an FPC substrate having a metal foil adhered to a base film. A rotary type die stamping die which is sandwiched between a mold part and an ambiroller and cuts the metal foil of the FPC base material into a predetermined circuit pattern while rotating the blade mold part; Is between a pair of blades and
It consists of a certain pressing surface, also of a is formed so as to be oblique to the axis of rotation of the blade-shaped portion.

Further, the blade section, in which you are formed in a spiral shape around the rotation axis of the mold portion.

[0013]

In the die stamping die configured as described above, the blade is formed obliquely with respect to the rotation axis of the blade, so that the entire length of the blade is longer than the width or the outer peripheral length of the blade. In addition, there is little damage to the blade due to rotation of the blade mold.

[0014]

Embodiments will be described below with reference to the drawings. The die stamping die 1 is obtained by directly sharpening a blade portion 20 by milling a cylindrical shaft 10 serving as a blade mold portion as in the related art, and then sharpening the same. Is provided with a pillow portion 11 that comes into contact with an ambilol (not shown). The shaft 10 has an axial through-hole 12 for inserting a heater at the center thereof.

As shown in FIG. 2, the blade portion 20 comprises a pair of blades 21 similar to the conventional one and a press contact surface 22 interposed therebetween, and a pair of opposing L-shaped circuits as shown in FIG. The outer peripheral surface between the pillow portions 11 of the shaft 10 is formed oblique to the rotation axis j so that the pattern can be cut.

Therefore, when the die stamping die is rotated once, the metal foil of the FPC substrate A sent out from the roll is cut, and the circuit pattern x is formed obliquely as shown in FIG.

FIG. 4 shows another embodiment. The die stamping die 2 is provided with the pillow 31
And shaft 30 having through hole 32 for heater insertion
And a blade portion 40 formed on an outer peripheral surface between the pillow portions 31 of the shaft 30.
Is formed in a helical shape around the rotation axis j of the shaft 10, which is different from the above embodiment.

Therefore, when the die stamping die 2 is rotated twice, four circuit patterns y having a longer slope than the circuit pattern x are formed in parallel, as shown in FIG.

[0019]

As described above, in this die stamping die, the blade is formed so as to be oblique with respect to the rotation axis of the blade part, so that damage to the blade due to rotation of the blade part is small. The yield of the product is improved, and the cost associated with the repair and replacement of the blade can be reduced.

Further, since a longer circuit pattern can be formed as compared with the case where the blade is formed parallel or perpendicular to the rotation axis, the width and diameter of the blade mold portion can be suppressed to the minimum necessary. This makes it possible to reduce the size of the equipment, reduce the manufacturing cost of the blade mold, and reduce the labor required when replacing the blade mold.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment according to the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a plan view showing a cut state of the FPC base material.

FIG. 4 is a perspective view showing another embodiment.

FIG. 5 is a plan view showing a cut state of the FPC base material.

FIG. 6 is an explanatory diagram of a manufacturing process of a conventional flexible circuit board.

FIG. 7 is an explanatory view of a manufacturing process of a conventional flexible circuit board.

FIG. 8 is an explanatory diagram of a manufacturing process of a conventional flexible circuit board.

FIG. 9 is a side view showing a conventional rotary die stamping die.

FIG. 10 is a plan view showing an example of a circuit pattern.

FIG. 11 is a perspective view showing a conventional die stamp die for cutting the circuit pattern.

FIG. 12 is a perspective view showing a conventional die stamp die for cutting the circuit pattern.

[Explanation of symbols]

 1,2 die stamping die 10,30 shaft 11,31 pillow 12,32 through hole 20,40 blade 21 blade 22 press-contact surface A FPC base material x, y circuit pattern

Claims (2)

(57) [Claims] An F having a metal foil adhered to a base film
The PC base material is sandwiched between a column-shaped blade-shaped part formed by forming a blade part on an outer peripheral surface and an ambiroll, and the metal foil of the FPC base material is rotated in a predetermined circuit pattern while rotating the blade-shaped part. In a rotary die stamping die designed to be cut into two pieces, the blade portion is composed of a pair of blades and a press contact surface located therebetween.
Ri, formed to be slanted with respect to the rotational axis of the cutting die unit
By die stamping mold, characterized in that the. Wherein said blade portion, the die stamping mold of claim 1, wherein formed in a spiral shape around the rotation axis of the cutting die unit.