JPH05260582A - Manufacture of phase plug for speaker - Google Patents

Abstract

PURPOSE:To easily perform manufacturing and to prevent looseness in a connecting part from occurring while a phase plug is being used by generating by casting the phase plug formed with plural circular cones with different diameters. CONSTITUTION:The phase plug F is formed by providing the truncated circular cone 1 of a shaft center part and a space S in which plural concentrically arranged circular cones 21-24 are converged advancing downward, and connecting them with a bridge member B. The model of the space S is made by casting wax, and a casting drag can be made by removing the wax after casting gypsum sol based on the model, and the phase plug can be easily generated integrally with the bridge member by injecting zinc melt reducing pressure via the gate 531, the gate 521, and the weir 511 of a casting die 8 combined with the upper die, and the looseness in the connecting part can be prevented from occurring while it is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a speaker phase plug.

[0002]

2. Description of the Related Art Conventionally, phase plugs for speakers are
A plurality of frustoconical cylinders with different diameters and conical members are separately cast, and these frustoconical cylinders are arranged substantially concentrically in a substantially concentric shape with a gap between each and also inside the innermost frustoconical cylinder. It was manufactured by arranging a conical member with a gap appropriately and connecting and fixing the adjacent truncated conical cylinder and the conical cylinder and the conical member by a bridge member.

[0003]

However, in such a conventional method for manufacturing a speaker phase plug, when a plurality of truncated conical tubes and a truncated conical tube and a conical member are fixed by the bridge member, It takes time to maintain the gap between the adjacent truncated cones and the gap between the innermost truncated cone and the conical member in a predetermined state, and as a result, the manufacturing efficiency of the phase plug must be reduced. It had the inconvenience of not having.

An object of the present invention is to eliminate such inconvenience.

[0005]

In order to achieve the above object, in the method for manufacturing a speaker phase plug according to the present invention, a plurality of truncated cones having different diameters are arranged substantially concentrically with a gap therebetween. For a speaker in which conical members are arranged substantially concentrically inside the innermost frustoconical cylinder with an appropriate gap, and the frustoconical cylinder and the conical member that are adjacent to each other are connected and fixed by a bridge member. In the phase plug manufacturing method,

The plurality of truncated cones and the bridge member are integrally cast.

[0007]

Since the method of manufacturing the speaker phase plug according to the present invention is configured as described above, when the frustoconical cylinders and the frustoconical cylinder and the conical member are connected and fixed by the bridge member, they are adjacent to each other. It is not necessary to keep the gap between the frusto-conical cylinders that fit together and the gap between the frusto-conical cylinder and the conical member at the innermost part in a predetermined state.

[0008]

1 to 3 show a phase plug F manufactured according to the present invention. In the figure, 1
Is a conical member, and is arranged at the axis of the phase plug F. Reference numeral 21 denotes a frusto-conical cylinder which is the innermost portion, and is concentrically arranged outside the conical member 1 with a gap S therebetween.
Reference numerals 22 and 24 are truncated cones having different diameters, which are arranged in a substantially concentric shape around the innermost truncated cone 21 with an appropriate gap S therebetween. The innermost truncated cone 21
And the conical member 1 and the adjacent frustoconical cylinders 21 and 24
The bridge members B are integrally fixed to each other. The gap S is gradually narrowed downward.

A method of casting the phase plug F having the above structure will be described.

FIG. 4 shows an apparatus for molding a model M of a phase plug. In the figure, 3 is a gap model 3 having the shape of the gap S, which is installed in the lower molding die 41. The gap model 3 is made of water-soluble green wax. Further, 31 is a base portion, and the gap model 3
Are connected to the lower end of the. This base 31 is a gap model 3
Is easily installed in the lower molding die 41. In addition,
Reference numeral 42 denotes an upper forming die, which is superposed on the lower forming die 41. Wax (water-insoluble) injection holes 421, 421, ... Are formed in the upper forming die 42. This wax injection hole 42
1,421, ... Form weir models 51,51 ,.

In this apparatus, the wax injection holes 421, 42
By pouring a water-insoluble red wax from 1, 1, solidifying, releasing the mold, and then soaking it in water,
The gap model 3 is melted. Then, the model M of the phase plug shown in FIG. 5 is formed. In the figure,
51, 51, ... are weir models.

After that, as shown in FIG. 5, the runner model 52 and the sprue model 53 are placed under the model M of the phase plug and placed on the surface plate 6. In this case, the runway model
52 contacts the weir models 51, 51, .... The runner model 52 and the sprue model 53 are integrally formed with a non-water-soluble wax. Further, reference numeral 61 is a mold, which is placed on the surface plate 6. The mold 61 encloses the model M of the phase plug in the above state with a predetermined interval.

In this state, the plaster C sol was poured into the mold 61, gelled, and then released from the mold (see the state of FIG. 6), and heated in a steam oven at 100 ° C. for 30 minutes, Dewax. Then, after drying at 700 ° C for 2 hours,
The furnace is cooled to 210 ° C. (in a reduced pressure state) to vaporize the phase plug model M, the runner model 52, and the sprue model 53 to obtain a gypsum mold D (see FIG. 7). In this mold D, 511, 511, ... Are weirs, 521 is a runner, and 531 is a sprue.

Molten metal (zinc, 350-4
(00 degree C) is poured under reduced pressure to solidify and then gypsum C is removed by spraying high-pressure water to obtain a cast product 8 shown in FIG. This cast product 8 is line A with a band saw.
After cutting along the line, the phase plug F can be obtained by cutting the weirs 511, 511, ... While cutting the curved surface with an NC lathe.

[0015]

According to the method of manufacturing a speaker phase plug according to the present invention, a plurality of frustoconical cylinders having different diameters are arranged substantially concentrically with a gap between each of them and the innermost frustoconical cylinder is disposed inside. In the method for manufacturing a speaker phase plug in which conical members are arranged in a substantially concentric shape with an appropriate gap, and adjacent frustoconical cylinders and bridge members are connected and fixed to each other,

Since the plurality of frustoconical cylinders and the bridge member are integrally cast, when the frustoconical cylinders and the frustoconical cylinder and the conical member are connected and fixed by the bridge member, the adjacent frustoconical cylinders are adjacent to each other. It is not necessary to keep the clearance between them and the clearance between the innermost truncated cone and the conical member in a predetermined state.

Therefore, if the method for manufacturing the phase plug for the speaker is used, the phase plug can be easily manufactured, the manufacturing efficiency is improved, and the connecting part is not loosened during use because it is integrally cast. is there.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a speaker phase plug of the present invention.

FIG. 2 is a bottom view of the same.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a manufacturing process diagram of the speaker phase plug of the present invention.

FIG. 5 is a manufacturing process diagram of the speaker phase plug of the present invention.

FIG. 6 is a manufacturing process diagram of the speaker phase plug of the present invention.

FIG. 7 is a manufacturing process diagram of the speaker phase plug of the present invention.

FIG. 8 is a manufacturing process diagram of the speaker phase plug of the present invention.

[Explanation of symbols]

 1… Conical member 21… Conical conical cylinder 22… Conical conical cylinder 23… Conical conical cylinder 24… Conical conical cylinder B… Bridge member F… Phase plug S… Gap

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[Procedure amendment]

[Submission date] March 17, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

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[Figure 1]

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[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (1)

[Claims] 1. A plurality of frustoconical cylinders having different diameters are arranged substantially concentrically with a gap therebetween, and a conical member is arranged inside the innermost frustoconical cylinder substantially concentrically with a gap therebetween. In the method of manufacturing a speaker phase plug in which a frustoconical cylinder and a conical cylinder and a conical member that are adjacent to each other are connected and fixed by a bridge member, the plurality of frustoconical cylinders and the bridge member are integrally cast. Manufacturing method of speaker phase plug.