JPS5842817B2 - Method for manufacturing a plate with ventilation holes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a plate having ventilation holes that can be used, for example, as a top plate constituting a cabinet of an amplifier. The aim is to provide a simple manufacturing method.

Generally, in an amplifier device, a ventilation hole is provided in the top plate (ceiling plate) of the cabinet in order to dissipate heat from transformers, power transistors, etc. arranged in the cabinet to the outside.

Therefore, as shown in Figure 1, conventional cabinets are often made of metal plates and have a top plate 1 with many ventilation holes 2 for heat radiation, but cabinets for export (to Europe and America) are made of wood. Since this is strongly required, a large opening 4 is made in the wooden ceiling 3 as shown in Fig. 2, and a large number of metal holes are made in the back of the top plate 3 to cover this opening 4. A plate to which a plate 5 is attached is used.

However, in recent years, when exporting amplifier devices, etc., safety standards have been strengthened in the export destination, and the current situation is that amplifier devices, etc. using conventional cabinets as described above do not comply with these standards.

The main standards are as follows: ■ The temperature rise in the heat dissipating part of the cabinet is 40°C or less for metals, and for non-metals (
(wood, plastics, etc.), the temperature must be regulated below 60°C; ■Thickness 2.
Metal plates (coins) measuring 3 mm and 18 Ttm in length must not be inserted; ■ The plastic must be non-heat-resistant and approved; cabinets must be designed to meet these standards. Research and development must be carried out by taking into account the materials used for cabinets, the processing methods for heat dissipation holes, the strength of the cabinet, production costs, etc.

The present invention is the result of research and development in consideration of these various problems, and one embodiment thereof will be described below with reference to the drawings.

FIG. 3 shows the external appearance of the cabinet of the amplifier in this embodiment, where 11 and 12 are side plates, 13 is a top plate, and 14 is a top plate.
This is the front panel on which control knobs, etc. are attached.

The top plate 13 is made of a wooden board (plywood, including particle board, hardboard, etc.), and its heat dissipation part, that is, the upper part where power transistors and the like are arranged, is configured as shown in FIG. .

That is, a plurality of plate materials 13at13b, 13c...
・ are arranged parallel to each other at a predetermined interval so that adjacent plates 15 are formed between adjacent plates, and these plural plates are made of metal plates with a large number of holes formed by punching ( (hereinafter referred to as punching metal) 16 for positioning.

When comparing the cabinet of this embodiment with the conventional cabinet shown in Fig. 2, the cabinet in Fig. 2 has a metal plate 5 as its heat dissipation part, so according to the safety standards mentioned earlier, the temperature rises above room temperature. The temperature must be regulated to 40°C or less, which considerably increases the heat dissipation effect, but it is necessary to suppress the temperature rise by using transformers and transistors with a capacity greater than the required capacity, which increases the cost considerably. .

However, in this embodiment, although a punching metal 16 is used for the heat radiation part of the cabinet, this metal 16 is made of plate materials 13at13b, 13c, etc.
Since the safety standards for the heat dissipating parts of the cabinet are those for non-metals, and the temperature rise is allowed up to 60'C, the amount of heat dissipated is large. It becomes possible to use electrical parts.

In addition, the material shown in Figure 2 cannot be processed very delicately due to the nature of the material, and the holes for heat dissipation are large, making it difficult to satisfy regulations to prevent the insertion of foreign metal objects. There is also a problem in terms of quality assurance such as easy deformation, but in this example, the wooden board is fixed by pasting it on punched metal, so the wooden board is not particularly affected by heat, and it is relatively large. It can provide strength and ensure stable quality.

Next, manufacturing of the top plate 13 of the cabinet of this embodiment will be explained using the drawings from FIG. 5 onwards.

First, as shown in FIG. 5, the plate material 17 forming the top plate 13 is set on the base 18 with its back side up, and guided by the groove positioning guide plate 19 provided on the base 18. Transfer in the direction of the arrow.

At this time, a plurality of circular saws 20 whose pitch is matched to the gap 15 shown in FIG. A plurality of mutually parallel non-penetrating grooves 22 along the plate material 1
It is formed at a depth of approximately half the thickness of No. 7.

Next, an adhesive coating roller 23 is applied to the back surface of the plate material 17 on which the grooves have been formed, and an adhesive 24 is applied to the mounting surface of the punched metal 16 as shown in FIG.

As this adhesive, an adhesive made of epoxy resin, polyurethane resin, chloroprene, etc., which does not soften under heat of 80°C-too°C, was used.

Next, on the back side of the plate material 1T coated with adhesive, place the punching metal 16 (pre-coated) cut into a predetermined size as shown in Figure 7, and secure it with wood screws 25. The plate material 17 is held under pressure from its front side, the actual image side, until the adhesive 24 is solidified.

Next, the plate material 17 to which the punching metal 16 is glued and fixed is placed on its surface (the outer surface of the cabinet with the edge facing up).
As shown in the figure, set it on the base 18 again and transfer it to the groove 2.
A groove penetrating through 2 is formed using a circular saw 20.

In this way, the plate material 17, ie, the top plate 13, as shown in FIGS. 9A and 9B is completed.

Note that when cutting grooves on the plate material 17, the front side of the plate material 1T.

The position of the grooves provided on each back side is determined by the guide plate 19 of the base 18.
It becomes constant and passes through the plate material 17, but if the position shifts for some reason, a step 26 may be formed in the groove as shown in FIG. 10.

This can be achieved by making the outer periphery of the circular saw 20 tapered as shown in FIG. Even if the groove is misaligned as shown in Figure 11, a stepped portion will not be formed in the groove as shown in Figure 11.

As explained above, the present invention forms a plurality of parallel non-penetrating grooves at predetermined intervals on one surface of one plate material, and one side of the plate material is formed so as to cover all of these non-penetrating grooves. A metal plate material with a large number of holes drilled in the surface thereof is adhesively fixed, and then a plurality of parallel grooves are formed from the other surface of the plate material having the non-penetrating grooves to communicate with the non-penetrating grooves. Since a plate having pores is manufactured, a plate with high dimensional accuracy can be manufactured in a relatively short time, and costs can be significantly reduced.

The plate obtained in this way is made by connecting and fixing a plurality of plates with a metal plate with a large number of holes, so even if the plurality of plates are made of wood-based materials, it is not enough. It can have strength and breathability, and even if the plate material with many holes is made of metal material, by adjusting the spacing between the multiple plates, there is no risk of children coming into direct contact with the metal plate material, making it safe. It also prevents foreign matter from entering or passing through the gaps between the plurality of plates.

Therefore, if the plate material obtained by the manufacturing method of the present invention is used for the top plate of a cabinet such as an amplifier, the safety standards can be fully satisfied.

[Brief Description of the Drawings] Figures 1 and 2 are perspective views showing conventional cabinets, Figure 3 is a perspective view of a cabinet using the plate of the present invention as a top plate, and Figure 4 is a cross-section of the main parts thereof. Figures 5A, 5A, 6A, 7A, 7A, 8A, 9A, 9B are diagrams for explaining the manufacturing process of the same plate, and Figure 10 is the same plate. FIGS. 11A to 11E are cross-sectional views showing a case where a positional shift occurs in the grooves of the body, and are diagrams showing a manufacturing process of a plate body that can eliminate the occurrence of a stepped portion due to the positional shift of the grooves. 13...Top plate, 13a, 13b, 13cm board, 15
...Gap, 16...Punching metal, 17...
Plate material, 20... Circular saw, 22... Groove, 24... Adhesive, 25... Wood screw.

Claims (1)

[Claims] A plurality of parallel non-penetrating grooves are formed at predetermined intervals on one surface of 11 plate materials, and a large number of parallel non-penetrating grooves are formed on one surface of the plate materials so as to cover all of these non-penetrating grooves. A metal plate with holes drilled therein is fixed by adhesive, and then a plurality of parallel grooves are formed from the other side of the plate having the impermeable grooves to the impermeable grooves. Method of manufacturing a plate. 2. The method of manufacturing a plate body having ventilation holes as set forth in claim 1, wherein the grooves provided on the two surfaces of the plate material are tapered grooves whose deep portions are narrower than the opening portions.