JPH02239799A - Forming metallic die device for speaker diaphragm - Google Patents

Abstract

PURPOSE:To surely locate an edge inner peripheral ridge to any side of a dia phragm by providing a correction cavity accommodating the edge inner periph eral ridge between the cavity forming the diaphragm and an insert cavity inserted for the edge and locating the edge inner peripheral ridge surely to the front or rear side of the diaphragm depending on the injection pressure when the diaphragm is subject to injection molding. CONSTITUTION:The insert cavity 13 to insert an edge 22 is formed to the periph eral ridge of the cavity 12 corresponding to the peripheral part of the diaphragm and a part with consecutive cavity 12 and insert cavity 13 is formed with the correction cavity 12X by which the attitude of the inner peripheral ridge 22A of the edge 22 is corrected by a pressure of the injected resin. When the edge 22 is inserted in the insert cavity 12X, the edge inner peripheral ridge 22A is pending down in the correction cavity 12X as shown in virtual lines in figure by the deal weight and even when a space is formed above and under the inner peripheral ridge 22A, the inner peripheral ridge 22A of the edge 22 is incorpo rated with the diaphragm while being pressed onto the upper face 12m of the correction cavity 12X by the injection pressure of the diaphragm.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding device for a speaker diaphragm, and more particularly to a molding device suitable for insert molding of a cone-shaped diaphragm and an edge.

[Conventional technology]

It is known that diaphragms used in speakers, especially cone-shaped diaphragms, are insert-molded with edges made of suspensorane, and a schematic of the molding die is shown in Figure 3. . That is, a cavity l^ corresponding to a cone-shaped diaphragm is formed in the fixed mold L, and an insert cavity 1B for inserting the edge is formed continuously to this cavity IA.
The movable mold 2 is met with the fixed mold 1, resin is injected into the cavity IA in which the edge 3 is inserted and the inner peripheral edge 3A is located, and the diaphragm 4 and the edge 3 are integrally molded.

[Problem to be solved by the invention]

In the above-mentioned insert mold device, depending on the injection conditions, the inner peripheral edge 3A of the edge 3 exists on the front side of the diaphragm 4 (Fig. 4 (A)), and when it exists on the back side (Fig. 4 (B)).
)) There is.

In other words, even if Proposition 1 states that the edge 3 is located on the front side of the diaphragm 4, a woven fabric such as cotton or silk, or a woven fabric made of heat-resistant chemical fiber is used as the edge. ,
Because the diaphragm is made of a composite material in which polypropylene is mixed with fillers such as carbon fiber and mica, Edge 3
Since the rigidity of the diaphragm is small, it will be broken in the cavity IA, and the diaphragm and the edge will be integrated by injection molding in that state.

In severe cases, the edges of the same diaphragm may be located on the front side of the diaphragm in some areas, and the edges may be on the back side of the diaphragm in other areas, resulting in inconsistent quality of the diaphragm. There was a problem.

Therefore, the present invention aims to provide a molding device for a speaker diaphragm that ensures that the relationship between the edge and the diaphragm is in a predetermined state when the diaphragm is insert-molded. .

[Means to solve the problem]

In order to achieve the above-mentioned objects, the present invention provides a molding device for molding a cone-shaped diaphragm by inserting an edge, which includes a cavity for injection molding the diaphragm and an insert cavity for inserting the edge. A modification cavity is provided between which the inner peripheral edge of the edge is accommodated, and the modification cavity is configured such that the inner peripheral edge of the edge is pressed against the upper surface or the outer surface by injection pressure and is brought into close contact with the upper surface or the outer surface. It is.

[Function] There is a deformation space at the periphery of the cavity in which the inserted inner periphery of the edge is deformed upward or toward the outer periphery within the cavity for the diaphragm, so by injecting the resin of the diaphragm, The inner periphery of the edge is reliably in place.

〔Example〕

Hereinafter, Figures 1 and 2 of the drawings accompanying embodiments of this invention will be described.
This will be explained according to the diagram. First, in these figures, reference numeral U indicates a fixed type, which has a cavity l2 corresponding to a cone-shaped diaphragm, and a periphery for inserting an edge 22 into the periphery of the cavity 12, which corresponds to the periphery of the diaphragm. An insert cavity ■3 is formed, and in the continuous part of the cavity l2 and insert cavity l8,
A correction cavity 12X is formed in which the inner circumferential edge 22^ of the edge 22 is corrected in posture by the pressure of the injection resin, and the upper surface 12m+ of this cavity 12X becomes a parting line for the movable mold 15, which is the upper mold. There is. Moreover, the inner circumferential side of this correction cavity 12X is an inner side 12n that stands up from the cavity 12, and the end surface of the inner circumferential edge 22A of the edge 22 comes into contact with it.

In the above-described molding die device, when the edge 22 is inserted into the insert cavity 12X, the inner circumferential edge 22A of the edge 22 is bent into the correction cavity 12X due to its own weight.
The inner peripheral edge 22 hangs down as shown by the imaginary line in FIG.
Even if a space is formed above and below A, the injection pressure of the diaphragm forces the inner peripheral edge 22A of the edge 22 against the upper surface 12- of the correction cavity 1'2X and integrates it with the diaphragm. .

[Other Examples]

In the above embodiment, the inner peripheral edge 22 of the edge is provided on the front side of the diaphragm.
Although a mold device suitable for molding a device where ^ is located is shown, in order to mold a diaphragm where the inner peripheral edge 22A of the edge is located on the back side of the diaphragm, modification is required as shown in Fig. 2. The wall of the outer 12P of the cavity 12X is made vertical, and the inner peripheral edge 22A of the edge 22 can be molded by being pressed against the outer 12P by injection pressure even if it is floating due to some elasticity, as shown by the imaginary line in the figure. Use a mold.

As a result, the inner peripheral edge 22A of the edge 22 is placed on the back side of the diaphragm.
It is possible to obtain a diaphragm on which the diaphragm is located.

In this embodiment, the outer side 12P is vertical, but it does not necessarily have to be vertical and may be an inclined surface.

[Effects of the Invention] As is clear from the above description, in the speaker diaphragm molding device of the present invention, the inner peripheral edge of the edge is located between the cavity for molding the diaphragm and the insert cavity for inserting the edge. Providing a modification cavity to accommodate the
When injection molding the diaphragm, the injection pressure ensures that the inner edge of the edge is on the front side of the diaphragm. Or the back side (including the peripheral side)
Because it is configured so that it can be positioned in the same position, it is possible to control the posture during insert molding. The inner periphery of the edge, which has been difficult to correct, can be reliably positioned on either side of the diaphragm.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of a part of a mold device for a speaker diaphragm according to the present invention, FIG. 2 is an enlarged cross-sectional view of the same part according to another embodiment, and FIG. 3 is a cross-sectional view of a conventional mold. , Figure 4 (^). (13) is an enlarged sectional view showing an example of molding a diaphragm using a conventional molding die. 11... Fixed type, l2... Cavity, 12X...
・Correction cavity, 12m...top surface, 12n...inside, 12P...outside, l3...insert cavity l5...movable type, 22...edge, 22A...inner periphery Fig. 2 1st

Claims (1)

[Claims] (1) In a molding mold device that molds a cone-shaped diaphragm by inserting an edge, a modified cavity in which the inner peripheral edge of the edge is accommodated between a cavity for injection molding the diaphragm and an insert cavity for inserting the edge. A molding device for a speaker diaphragm, characterized in that the modification cavity is configured such that the inner circumferential edge of the edge can be pressed into close contact with the upper surface or the outer surface by injection pressure.