JPS5927647B2 - Processing method of press metal fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing box-shaped press metal fittings, and is intended to provide a processing method that can easily achieve dimensional accuracy without increasing the number of processing steps.

As shown in Figure 1, four sides 2 perpendicular to the bottom 1
, 3, 4, 5, and a plurality of ears 6 for fixing a printed circuit board on l pairs of opposite sides. The process is more important than the structure of the mold.

First, each ear piece 6 was bent at a right angle, and then the four sides 2, 3, 4, and 5 were simultaneously bent vertically. When the press metal fitting 7 having the structure shown in FIG. Relief must be provided for piece 6.

However, because of this, the bending accuracy of the sides 2 and 3 having the tabs 6 deteriorates, and especially when the edges 2 and 3 have the tabs 6, the machining accuracy of these ends becomes extremely poor. It has become impossible to attach the printed circuit board to the lug 6, and even if the printed circuit board can be attached, the printed circuit board has been deformed, causing the foil to float or the like. In order to eliminate this drawback, the printed board mounting part 8 including the lug 6 is provided separately from the press metal fitting 7, and the printed board mounting part 8 is attached to the repress metal fitting by screws 9 or welding as shown in FIG. A method of fixing the printed board mounting part 7 was considered, but the process of obtaining the printed board mounting part 8 was increased, and the cost was high, which was inconvenient in practice. In view of the above-mentioned points, the present invention enables bending of sides having ears to be performed with high precision without increasing the number of processing steps.

An example of this will be described below with reference to FIGS. 3 to 6.
FIG. 3 shows a box-shaped press fitting 11 formed according to the present invention.
shows.

The feature of the present invention is that four sides 12, 13, 1
4 and 15 are in the unfolded state flush with the bottom surface 16, the ear piece 1
An opening 18 having a width substantially the same as the width of each ear piece 17 is provided on a bending line a of a pair of sides 12 and 13 having a width of 7, so as to face each ear piece 17. In this state, first, each ear piece 1
? Fold at a right angle, then fold each of the four sides 12 to 15 at the same time.

The process of bending these four sides 12 to 15 is shown in FIG. Figure 5 a and b are ear piece 1? is shown in a state in which the bent press fitting 11 is sandwiched between the pressure pad 19 and the die 20. Here, dice 2
0 is provided with a notch 21 that serves as a relief for the ear piece 11.
In this state, the punch 22 is lowered to bend the sides 12 and 13 (of course, at this time, the other sides 14 and 15 are also bent at the same time) from the bending line a that includes the opening 18. This state is sequentially shown in FIGS. 5C and 5D. At this time, the die 20 does not hit the hole 18, but by providing the hole 18 as described above, the sides 12 and 13 can be bent smoothly and with precision. A good 90 degree bending condition can be obtained, even if the side is 12,1
Even if the tabs 17 are present at the ends of the tabs 3, highly accurate bending is possible. As a result, as shown in FIG. 4, it is possible to attach the printed circuit board 23 to the lug 17, and since each lug 17 is formed with high dimensional accuracy, the printed circuit board 23 is not deformed.

Further, as shown in FIG. 2, processing can be performed without using printed board attachment parts separately from the press fittings, reducing the number of steps and reducing costs. There are still 12 sides on each side in Figure 6.
The main parts of the press metal fittings which are not bent are shown. As explained above, according to the present invention, an opening is provided in parallel to the bending line of the side having the lug so as to face the lug, and then, by bending the side having the lug, The edge having the tab can be bent with high precision, which is extremely effective in practice.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the completed state of a conventional press metal fitting, Fig. 2 is a view showing the assembled state of a conventional lug piece, and Fig. 3 is a perspective view of a press metal fitting obtained by the processing method of the present invention. Figure, 4th
Figures A, b are cross-sectional views and front views of the main parts, Figures A, b, c,
d is a diagram for explaining the press τ process of the present invention, No. 6
Figures A and b are a top view and a side view showing the state before the sides are bent. 11... Metal fittings, 12, 13, 14, 15...
... Side, 16 ... Bottom, 17 ... Ear piece, 18 ... Opening.

Claims (1)

[Claims] 1 has a side that can be bent perpendicularly to the first surface,
In a press metal fitting having a tab on this side that is bent perpendicularly to the side, the tab is bent perpendicularly to the side, and an opening is provided on the bending line of the side so as to face the tab. . After that, the side is bent perpendicularly to the first surface along the bending line.