JPH0230498A - Punching fitting for working printed board - Google Patents

Abstract

PURPOSE:To smooth the cut end face of the following board by forming the crossed axes angle made by the blade of the side of a male die projected in a trapezoidal shape and the end face of a printed board to be cut at an acute angle. CONSTITUTION:The both side sides a male die 22 projected in a trapezoidal shape in a punching fitting 20 are taken as an inclined blade 22a. In this case, this blade 22a is formed so that the crossed axies angle theta with the end face (or inner wall face of a through hole) of a printed board 1 becomes an acute angle. As a result, the cut end face (or inner wall face of a through hole) becomes a smooth face.

Description

[Detailed Description of the Invention] (Industrial Application) The present invention is a printed Sakaka r, ITI press punching method that can form a double-sided connecting conductor suitable for the side end surface of a printed board. Fig. 3 (21) and (bl are respectively) showing the structure for connecting the printed wiring patterns 2 formed on both sides of the side plate 1. In (, 1), a double-sided connecting conductor; 3 is provided on the side end surface of the substrate 1, and in (b), a
A double-sided connecting conductor 3 is provided on the inner wall surface of the single-type acid forming hole 4. .

Such a connecting conductor is used not only to connect wiring patterns on both sides of a single printed board, but also to connect wiring patterns on the inner and outer surfaces 1 of a multilayer printed board.

As a method for forming a connecting conductor that connects both sides of the board (or multi-layered board) and the inside and outside layers of the board, first, copper,
A common method is to apply metal such as Nila gel, gold, or solder I by vapor deposition or plating, and then remove unnecessary portions of the metal by etching or other methods. lyrics tresis 1
~, selective etching with resist ink, etc.
However, as will be described later, the inner wall of the hole must be cut using a punching tool, a trill, a router bit (rotary blade), etc. In the conventional method using router pressure, the periphery of the conductor cut by the router bit is turned over, making it impossible to form a smooth connection conductor surface. For this reason, there was a drawback that the conductive film peeled off from the turned-up portion or that plating deposition in the subsequent process did not proceed smoothly.

To explain this in detail, Fig. 4(a)
(b) is an explanatory diagram of a conventionally used press-cutting fitting 10 and a connecting conductor 3 cut and formed by this press-cutting fitting 10, which has an advantage in that a plurality of connecting conductors can be cut at the same time. 5. However, the press-cutting umbrella 10 used here has a blade 10 as shown in the figure; i is the side end surface of the substrate 1 (inner wall surface of the through hole).
Since the conductor extends in the direction perpendicular to the cut end face (inner wall), it is pushed out and turned over in the direction of arrow J in the figure, making it unsuitable for practical use. Purpose of the Invention) The present invention has been made in view of the above, and includes pressing a connecting conductor with a smooth curve in Separation of Germany by Addition 1
7.The purpose is to provide a bracelet cutter for printed necks that can be formed.

(Summary of the Invention) [In order to achieve the first object, the present invention is used to provide a block plate for the first time.
'L+j through hole 1) - door X, -7 songs with multiple separate Germans
In the press-cut metal fitting for cutting and forming the connected conductor by pressing 1, the press-cut metal fitting has a trapezoidal protruding part, and the blades on the sides of the male mold are formed on the end surface of the substrate 1. J, ['j Intersection angle with the inner wall surface of the through hole 0
is characterized by an acute angle.

Further, it is characterized in that the connection body is formed by press working using a +ii4.1-press punching fitting. .

(Example 10) The following is a detailed explanation of the pudding of the present invention.

Figure 1 (,'') and (1)) show the press die 1 of the present invention.
! FIG. 2 is a perspective view and a bottom view showing the configuration of this metal fitting 20.
consists of a horizontally elongated base 21 and a plurality of trapezoids 22 protruding from the base 21 at predetermined intervals. The blade is slanted to 222v, and the famous sword 22a is the first.
As shown in Figure (b), the intersection angle 0 with the end surface of the substrate 1 (or the inner wall surface of the V↓ through hole) is set to be an acute angle (θ<90 degrees). The optimum value is 1゜hl [between the bottom surface 23 of the valley formed between the die 22 and the conductor 3 on the side end surface], which depends on the material of the board to be cut, the plate I9, the size of the conductor to be cut, etc. For example, the spacing between the spaces formed between
Set it to about 0.5 mm. .

FIG. 2 is an explanatory diagram of the cut surface of a printed board that has been cut and pressurized by the press-cutting metal fitting 20 of the present invention, and shows that the side piece of the connecting conductor 3 cut by the blade 22a having an acute intersection angle θ is Flip! - No defects such as ri are formed.

As described above, in the present invention, after forming metal conductor layers on both sides and side end surfaces of the substrate I, or in the through holes, in the following manner,
Unnecessary metal on both the front and back sides of the board is removed by etching, and finally, the full end face (inner wall surface of the 1'1 through hole) is cut using the press-cut metal fitting 20 to achieve a proper connection without turning the board. The conductor 3 can be made in the cylinder with high precision.

As a result, it becomes possible to easily realize internal connection of double-sided and multilayer boards (through the side end 101 of the prism base and the inner wall of the through hole), and the mounting density of the through-pole structure can be greatly improved. 1. (Effects of the Invention) As described in 1 below, according to the present invention, smooth surfaces are placed on the side end surfaces of the substrate and the land doors of the through holes. The connecting conductor can be formed separately by pressing 1".1

[Brief explanation of the drawing]

FIGS. 1(a) and (b) show t of the press punching fitting of the present invention.
Figure 2 is an explanatory diagram of a connecting conductor for a printing machine made using the press-cut metal fitting of the present invention; Figure 3 (11) and (b) 1 of the 11 folding board
．． ) - Both sides 6 - Structure diagram for connecting the formed print 1 to wiring pattern, Figure 4 (a) 1° which is an explanatory diagram of a connection conductor formed by cutting.

Claims (2)

[Claims] (1) A press-cutting metal fitting for cutting and forming a plurality of separate and independent connection conductors on the side end surface of a printed circuit board or the inner wall surface of a through-hole by press working, the press-cutting metal fitting having a male shape projecting in a trapezoidal shape, A press punching tool for processing a printed board, characterized in that the side blade of the male die has an acute angle of intersection θ with the end surface of the substrate or the inner wall surface of the through hole. (2) A method for manufacturing a connecting conductor for a printed board, characterized in that the connecting conductor is formed by press working using the press punching fitting.