JP3131228B2 - Ballast case manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a ballast cases manufacturing method manufactured using progressive dies.

[0002]

2. Description of the Related Art In a lighting fixture, a ballast is attached to a ballast case 1 shown in FIG. The ballast case 1 has a rectangular bottom plate 11 on which a pair of holes 13 for fixing to the instrument main body are formed at both ends and on which a ballast is placed, and both sides of the ballast which are erected from both side edges of the bottom plate 11. And a side plate 12 that sandwiches and holds it. By the way, in this type of ballast case 1, for example, to connect a connector to the ballast,
A part of the side plate 12 is cut out to form the concave portion 14,
Both sides are cut off on stairs.

A ballast case 1 of this kind is made of metal,
Generally, the outer shape and holes are processed by a punching die. By the way, this type of ballast case 1 has been manufactured using a progressive die rather than a single die for the purpose of reducing the cost and enabling mass production. That is, in the punching using the progressive die, the metal plate 2 in the material state shown in FIG. 5 (a) is advanced in the direction of the arrow shown in the drawing, and as shown in FIG. Simultaneously develop and connect in a certain direction. In the case of FIG. 5, the side plates 12 of the ballast case 1 adjacent to each other are punched out in a connected state. For example, the ballast case 1 at the center in FIG.
And the Nth and (N + 1) th side plates 1
The part to be cut off on both sides of 2 and the concave part 14 are simultaneously punched out. Next, the ballast cases 1 are cut along the broken line shown in FIG. 5 (b), and the ballast cases 1 are individually cut off as shown in FIG. In other words, the side plates 12 of each ballast case 1 are connected so as to be die-cut so as to eliminate material loss. Then, when the side plate 12 is bent along the broken line shown in FIG. 5 (c), the ballast case 1 is manufactured.

Meanwhile, the corner portion and which is formed in the opening edge of the recess portion 14 of the side plate 12, the corner portions formed at both end portions of the side plate 12, to have a radius as shown in FIG. 6 (a) As shown in FIG. 1 (b), the ball is cut obliquely (C-cut) so that no sharp edge is left, and the safety when the end face of the ballast case 1 is touched is maintained. is there.

[0005] However, even if, as shown in FIG. 6 (a), for example, the radius is formed so as not to leave an acute edge at the corner , the punching by the progressive die as described above results in a displacement α. (When the ballast cases 1 adjacent to each other are separated from each other as shown in FIG. 5 (c) from the state shown in FIG. 5 (b), a slippage α shown in FIG. 7 (a) occurs). It leaves a sharp edge to the corner portion as shown in FIG. 7 (b). It should be noted that the above-mentioned displacement α is inevitable when punching is performed using a progressive die. Also, when a C-cut is applied to the corner,
As shown in the figure, a sharp edge remains at the corner similarly due to the slippage α as shown in FIG. Note that the dashed lines in FIGS. 7 and 8A are originally Nth (N +
1) A line to be cut between the first and second side plates 12 is shown, and a solid line indicates a line actually cut.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a ballast case in which a sharp edge is not formed at a corner portion even if a slippage occurs. In the manufacture of products.

[0007]

According to the present invention, in order to achieve the above object, a corner formed on each side plate is provided.
Curve or cut straight to avoid sharp edges
And each side plate of the ballast case next to each other
Cutting to the cutting part between the side plates that separates and separates
Cut with a width that allows for the deviation of the die punching process.
Form cuts, unfold and connect adjacent side plates
Simultaneously hit the outer shape and holes of multiple ballast cases
After removal, stabilization of the cut section formed between the side plates
Cut in the center of the ballast case in the
Characterized in that they are individually separated from each other.

[0008]

[0009]

According to the present invention, as described above, by providing the cut portion in consideration of the slippage, even if the slippage occurs, only the cut portion remains at the edge between the corner portions, and the side plate is directly connected. As in the case of connecting and punching ,
Punching due to the influence of the working shift even if bleeding deviation corner portion of the other side plate remains in the corner portion of one side plate, sharp edges, a <br/> be formed in the ballast casing have .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The manufacturing method of the present invention will be described with reference to FIGS.
Explain the law. In the ballast case 1 obtained according to this embodiment , the side plates 12 of the ballast case 1 formed adjacent to each other are not punched out in a directly connected form as shown in FIG. As shown in the figure, the side plates 12 are punched out in a form in which the side plates 12 are connected at intervals so as to allow for slippage. For example, as shown in FIG.
When the opening edge of the concave portion 14 of each side plate 12 is provided with a radius, the ends of the radius portions facing the other side plates 12 are linearly connected to each other, and a deviation α between the side plates 12 is considered. Cutting section 15 having a width having a predetermined width
(The width in the vertical direction shown in the figure is 2α or more). Then, as shown in FIG. 5 (c), the cutting line for separating each ballast case 1 is located at the center of the cutting portion 15 as shown by the broken line in FIG.

Now, when the portion shown in FIG. 1 is cut, when one of the cut side plates 12
FIG. 2 shows a partial plan view of the cut portion of FIG. Even if the deviation α occurs, no sharp edge remains at the corner as shown in FIG. In the above case, the structure of the present invention is exaggerated so that the structure of the present invention can be easily understood.
Although it appears that the finger touches the corner of the cut portion 15 remaining on the edge of the side plate 12, the actual cut portion 15 is formed to the minimum width in consideration of the slippage α.
There is almost no injury to a finger or the like at the corner of the cut portion 15. For example, a finger may be a corner of the opening edge of the concave portion 14.
When the user touches the cut portion, the finger enters only up to the position shown by the broken line in FIG. 3, and therefore, the finger is less likely to touch the corner of the cutting portion 15. In the first drawing corner
Although the round portion is provided with a radius, a C cut may be performed.

[0012]

According to the present invention, as described above, each side plate is shaped.
Make the corners formed so that they do not have sharp edges.
Line or straight cut and stable next to each other
Side plates that cut between each side plate of the container case and separate individually
Between the cutting parts of the progressive die
Make a cut with a reasonable width, expand it and place it next to each other
External shape of multiple ballast cases by connecting matching side plates
After punching holes and holes at the same time,
The center of the above cut part in the juxtaposition direction of the ballast case
In cut, so to separate the ballast case individually, even if there is a possibility that the punching deviation occurs as in the case of performing the punching in progressive die by connecting directly to the side plates, the progressive die stamping
For cutting parts formed with a width that allows for processing deviation
Thus, a part of the corner portion of the other side plate is left in the corner portion of one side plate, stable that sharp edges are not formed
Container cases can be manufactured.

[0013]

[Brief description of the drawings]

FIG. 1 is a partial plan view of a main part of one embodiment of the present invention.

FIG. 2 is a partial plan view of one side plate after the above cutting.

FIG. 3 is an explanatory view showing the operation of the above.

FIG. 4 is a perspective view showing a ballast case.

FIG. 5 is an explanatory diagram showing a punching process using the progressive die according to the first embodiment.

FIGS. 6A and 6B are explanatory views of a method for processing different corner portions .

FIGS. 7 (a) and 7 (b) are explanatory diagrams of a problem when a slippage occurs in a ballast case in which a corner portion is machined in FIG. 6 (a).

FIGS. 8 (a) and (b) are explanatory diagrams of a problem when a slippage occurs in a ballast case having a corner processed in FIG. 6 (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ballast case 11 Bottom plate 12 Side plate 15 Cutting part

Claims (1)

(57) [Claims] 1. A corner formed on each side plate is formed at an acute angle.
Curve or straight cut to avoid sharp edges
Between the side plates of the ballast case adjacent to each other.
A progressive die is used to cut the part between the side plates that are cut and separated individually.
The cutting part has a width that allows for the deviation of the punching process
Form, expand and connect adjacent side plates
Simultaneously punches the outer shape and holes of multiple ballast cases
After that, the ballast of the cut section formed between the side plates
Cut at the center in the juxtaposition direction of the
Method of manufacturing ballast case characterized by individual separation
Law.