JPS6080399A - Manufacture of speaker grill - Google Patents

Abstract

PURPOSE:To form a beautiful speaker grill with high accuracy easily and inexpensively by heating a leg of a metallic net using high frequencies under pressure and using the heat so as to burry and fix the leg of the metallic net to the projected ridge of the grill frame. CONSTITUTION:An induction element 15 is fixed by fixing a jig 17 to a fixed stand 16 with a screw 19. Then the leg 14a of the metallic net 14 is arranged on the projected ridge 13 of the grill frame 11 and a plunger punch 20a of a pressing body 20 is contacted to the upper outer circumference of the metallic net 14 and the induction element 15 is energized. The induction heating is applied to the leg 14a of the metallic net 14 through the energizing of induction element 15 and a depressing force is applied to a pressing plate 21, then the projected ridge 13 is molten locally with the heat of the lower part of the heated leg 14a and the lower part of the leg 14a is burried in the molten ridge. While the leg is burried for a proper length, the power application to the induction element 15 is stopped so as to stop pressing of the pressing plate 21 and cool it, thereby fixing the metallic net 14 to the grill frame 11 completely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing speaker grills for car stereos and the like.

A speaker grill is made by fitting and fixing circular or square metal nets 1 to a grill frame made of synthetic resin. A U-shaped groove 3 for pouring the adhesive is provided in the inner circumference of the hole 2, and after pouring the adhesive 4 into the groove 3, the leg 5a of the metal net 5 is fitted into the groove 3, and the leg 5a is inserted into the groove 3. Apply adhesive 4 to part 5a.
Because the adhesive 4 was glued to the groove 3 of the grill frame 1, the work was complicated.Secondly, not only was there a risk that the adhesive 4 would adhere to other parts and contaminate them, but the adhesive 4 would be completely assimilated and dried. It took one day to complete the process, which resulted in poor work efficiency and high labor costs, resulting in higher product costs.

Also, as an alternative to the method described in ``U'', there is a method of making the groove narrower and press-fitting the legs of the metal net 1~ into it, but with this method, if the groove is too narrow, the net 1 will be damaged by the press force. ~
There are disadvantages such as deformation and difficulty in press-fitting properly.
On the other hand, if the grooves become wide, when used in a speaker, it not only produces a shaking J sound but also causes the problem of peeling.

The present invention has been made in view of the above-mentioned difficulties in the prior art, and aims to provide a method for manufacturing speaker grills easily and with high precision at a low cost. A leg of a metal net is placed on the rim of a thermoplastic synthetic resin grill frame, which is provided with a through hole covered by a net 1 and a rim of an appropriate thickness is integrally formed on the inner or outer periphery of the through hole forming part. The metal net 1 is placed under pressure.
- The lower part of the leg is heated by a high-frequency inductor, the heat melts the contact portion of the flange with the lower part of the leg, and the five leg parts are embedded and fixed in the flange. .

Next, an example of implementation of the present invention will be explained with reference to the drawings.

11 is a grill frame, 12 is a through hole provided in the grill frame 11,
13 is a ridge horizontally and integrally connected to the lower part of the inner circumference of the transparent glass 2; 14 is a metal net; 14a is a leg thereof; 25 is a high-frequency inductor made of a copper pipe or the like; A fixed base 17 made of electrically insulating material, such as wood, is electrically insulating like the base 16, and has a concave groove 18 into which the inductor 15 is inserted, and its outer shape is the same as the inner shape of the lower part of the grill frame 11, and its height is 19 jigs adapted to suit the ridges 13;
20 is an electrically insulating screw for fixing the jig 17 to the stand 16 with the inductor 15 placed in its recess 1g18; A press die 2 that matches the shape of the upper outer periphery of the metal net 14
The pressing body 21 formed at 0a is a suppressing plate on which the pressing body 20 is fixed downward.

On the other hand, in the method of the present invention, first, the jig 17 is fixed to the fixing base X6 with screws 19 to fix the inductor 15, and the legs 14a of the metal net 14 are placed on the projecting edge 13 of the grill frame 11.
is placed, the press mold 20a of the suppressor 20 is applied to the upper outer periphery of the metal net 14, and the inductor 15 is energized to inductively heat the legs 14a of the metal net 14 while applying a suppressing force to the suppressor plate 21. The heat of the heated lower part of the leg 14a causes the protruding edge 13 to melt locally, and the lower part of the leg 14a pressed by the pressing mold 20a of the suppressor 20 is embedded therein, so that the protruding edge 13 can be embedded for an appropriate length. When the metal net 14 is completely fixed and attached to the grill frame 11, the metal net 14 can be completely fixed to the grill frame 11 by turning off the current to the inductor 5, stopping the pressure on the suppression plate 21, and cooling the metal net 14. As a result, the speaker grill can be fixed in an extremely short time. is obtained.

In the above embodiment, the protrusion on the inner circumference of the through-hole forming part -1
Although the case where the edge is provided has been described, the projecting edge may be provided on the outer periphery of the hole forming portion.

In addition, the frequency of the high frequency current applied to the high frequency inductor 15 in the above is about 400K II Z, while the pressing force is about 5 to 3 kg/cnT, and
If the embedding stroke of the leg 1-4a is controlled by the suppressing force of the suppressing plate 20 and the person's mouth by appropriate means, it is possible to easily manufacture a speaker grill with uniform quality. be.

Furthermore, if necessary, in order to accurately position the metal net 14, if the metal net 4 is a circular grille, as shown in FIG.
A part of 4a is cut in an inverted ■-shape 14b, and a part of the grill frame 11 is cut in an inverted ■-shape 14b corresponding to the inverted ■-shape 4b.
Form a protrusion Ila, or as shown in Figure 5,
A ■-shaped protrusion] 4c is provided on the ll111I4a, and a ■-shaped protrusion 11b is formed on the creel frame 11, while the metal net 1
If ~ is a rectangular grill, the grill frame 1 will be
In order to prevent an excessive load from being applied to the metal net 1-1, the corners of the legs 14a of the metal net 1-14 are bent down as shown in FIG. 6a.
Alternatively, as shown in FIG. 6, the corners of the creel frame 11 may be formed into cutouts 1c.

The present invention is as described above, and includes a grill made of thermoplastic synthetic resin, which is provided with a through hole covered by a metal net and has a protrusion of an appropriate thickness integrally formed on the inner periphery or outer periphery of the through hole forming portion. Placing a metal net leg on the projecting edge of the frame, heating the lower part of the metal net O leg under pressure with a high frequency inductor,
The heat melts the abutting part of the flange with the lower part of the leg, and the lower part of the leg is embedded and fixed in the flange, and unlike conventional methods, adhesive is not used, resulting in a clean, high-precision speaker grill. can be produced and provided easily and at low cost, making it extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is an enlarged partial cross-sectional view of the joint between a conventional grill frame and a metal net, FIG. 2 is a front view of the left half of a speaker grill manufactured by the method of the present invention in cross section, and FIG. 3 is a cross-sectional view of the speaker grill manufactured by the method of the present invention FIG. 4 is a perspective view showing the arrangement of each member for carrying out the method, FIG. 4 is a front view with the left half in cross section of a state immediately before manufacturing a speaker grill by the method of the present invention, FIG. 5a,
FIG. 5 is a perspective view showing a method for positioning the metal net, and FIGS. 6a and 6 are perspective views showing a method for protecting the corners of a rectangular grill. 11 Grill frame, 12... Through hole, 13... Projection, ]4
...Metal Neso 1-21/Ia...Metal net legs,
15... High-frequency induction 1st evil 2 Fig. 2 4 3 12 3rd cause Fig. 4 I 5th cause (a)

Claims (1)

[Claims] 1. Said flange of a g1-nor frame made of thermoplastic synthetic resin, in which the through holes covered by metal nets 1 to 1 are renumbered and a flange of an appropriate thickness is integrally formed on the inner periphery or outer periphery of the through-hole forming part. A leg of a metal net is arranged on top, and the lower part of the leg of the metal net 1- is heated by a high-frequency inductor under pressure, and the heat melts the contact portion of the protrusion with the lower part of the leg. A method for manufacturing a speaker grill, characterized by embedding and fixing it in the projecting edge.