WO2021134247A1

WO2021134247A1 - Diaphragm forming mold

Info

Publication number: WO2021134247A1
Application number: PCT/CN2019/130017
Authority: WO
Inventors: 梁平; 赵彬
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-08

Abstract

The present application provides a diaphragm forming mold, comprising a cavity used to form a diaphragm. The diaphragm forming mold comprises an upper mold and a lower mold, and the upper mold and the lower mold connectingly enclose to form the cavity used to fabricate a diaphragm. The cavity comprises a main body-forming portion and a surround-forming portion extending and bending from a periphery of the main body-forming portion. The surround-forming portion comprises a top-forming portion and an arched edge-forming portion extending and bending from two ends of the top-forming portion. A formation thickness of the top-forming portion is less than a formation thickness of the arched edge-forming portion, such that fabrication using the top-forming portion and the arched edge-forming portion forms a diaphragm having a uniform thickness. Compared to conventional molds having the same thickness for a top-forming portion and an arched edge-forming portion of a surround-forming portion, the invention enables the formation thickness of the top-forming portion to be less than the formation thickness of the arched edge-forming portion. The mold of the present application alleviates the problem of non-uniformity of fabricated diaphragm thicknesses caused by contraction and deformation of a material, thereby providing superior forming quality.

Description

Diaphragm forming mold

Technical field

This application relates to the field of electronic product processing, in particular to a diaphragm forming mold.

Background technique

With the rapid development of science and technology, audio equipment continues to develop rapidly, and people have higher and higher requirements for the functionality of audio equipment. For speakers, more and more people have put forward higher requirements for their audio performance. The speaker diaphragm of the related art includes a dome and a ring-shaped folding ring arranged around the dome, and the thickness of the folding ring is usually the same thickness. Therefore, in the existing diaphragm forming mold, the thickness of the folding ring forming part is also equal.

technical problem

However, due to the shrinkage of the diaphragm material itself during the manufacturing process of the existing diaphragm of some special materials, the formed diaphragm has uneven thickness at the folding ring, and the molding quality is poor, which does not meet the original design expectations. The desired effect.

Technical solutions

The purpose of the present application is to provide a diaphragm forming mold, so as to solve the problem of uneven thickness of the diaphragm in the manufacturing process.

In order to achieve the above objective, the present application provides a diaphragm forming mold including a cavity for forming a diaphragm. The diaphragm forming mold includes an upper mold and a lower mold, and the upper mold is connected to the lower mold. And forming the cavity for manufacturing the diaphragm, wherein the cavity includes a main body forming part and a folding ring forming part bent and extending from the periphery of the main body forming part, the folding ring forming part It includes a top forming part and a hemming forming part bent and extending from both ends of the top forming part; the forming thickness of the top forming part is smaller than the forming thickness of the hemming forming part, so that the diaphragm forming mold is After the manufacture is completed, the diaphragm with uniform wall thickness is formed.

Optionally, the forming thickness of the folded ring forming part gradually increases from the top forming part to the hemming forming part.

Optionally, the forming thickness of the folding ring forming part gradually increases from the middle part of the top forming part to the end of the hemming forming part away from the top forming part.

Optionally, the forming thickness of the top forming part is the same, and the forming thickness of the hemming forming part gradually increases from the connection point with the top forming part to away from the top forming part.

Optionally, the hemming forming part and the top forming part are smoothly transitionally connected.

Optionally, a first groove is concavely formed on the side of the upper mold facing the lower mold, and the groove bottom of the first groove is further recessed in a direction away from the lower mold to form a second groove The position of the lower mold corresponding to the second groove is arched toward the upper mold to form a protrusion, the depth of the second groove is greater than the height of the protrusion, and the protrusion and the first The groove is enclosed to form the cavity.

Optionally, the second groove is an annular groove, and the protrusion is an annular protrusion corresponding to the second groove.

Optionally, a side of the upper mold facing the lower mold is recessed in a direction away from the lower mold to form an installation groove, the installation groove is arranged around the first groove, and the lower mold is clamped in The installation groove abuts against the groove bottom of the installation groove.

Optionally, the diaphragm forming mold can be used to manufacture a diaphragm made of silicone, rubber, or TPU.

Beneficial effect

The beneficial effect of the present application is that by making the forming thickness of the top forming part of the folding ring forming part smaller than the forming thickness of the hemming forming part, compared with the traditional mold with the same forming thickness of the top forming part and the hemming forming part, it is vibrating After the diaphragm is manufactured, the mold of the present application can improve the uneven thickness of the diaphragm formed due to the shrinkage and deformation of the material during the manufacturing process, so that the thickness consistency at the diaphragm fold ring is improved, and the molding quality is better.

Description of the drawings

FIG. 1 is a schematic diagram of an embodiment of the diaphragm forming mold of this application;

Figure 2 is a cross-sectional view at A-A in Figure 1;

Figure 3 is an enlarged view of B in Figure 2;

Figure 4 is an exploded view of a part of the structure of the diaphragm forming mold in Figure 1;

Fig. 5 is a schematic diagram of an embodiment of the upper mold in Fig. 4.

Embodiments of the present invention

The application will be further described below in conjunction with the drawings and implementations.

The embodiment of the present application provides a diaphragm forming mold. Referring to FIGS. 1 to 2, the diaphragm forming mold includes an upper mold 10 and a lower mold 20. The upper mold 10 and the lower mold 20 are connected and enclosed to form a diaphragm for manufacturing the diaphragm. The cavity 30 includes a main body forming part 31 and a folded ring forming part 32. The folded ring forming part includes a top forming part 321 and a hemming forming part 322. The forming thickness of the top forming part 321 is smaller than that of the hemming forming during the manufacturing process. The molding thickness of the part 322 is due to the different composition ratios of silicone, rubber, TPU and other polymer materials during the manufacturing process. During the molding process, the shrinkage rate of the top molding part 321 is less than that of the hemming molding part 322. Shrinkage rate, in order to compensate for the molding error caused by material shrinkage, a compensation thickness is set at the hemming forming part 322 of the cavity 30, so that the thickness of the final formed diaphragm at the top forming part 321 and the hemming forming part 322 Uniformity, thereby forming a diaphragm with uniform thickness. Specifically, the compensation thickness of different positions in the cavity 30 corresponding to the diaphragm can be the same or different, and the specific value of the compensation thickness can be designed according to the actual diaphragm material and manufacturing environment.

The cross-section of the cavity 30 is an elongated structure as a whole. On the elongated structure, a hemming forming part 322 and an arched top forming part 321 are formed. The junction of the hemming forming part 322 and the top forming part 321 is smoothly formed. The integrated structure ensures that the cavity 30 can form an integrated diaphragm. The molding thickness of the cavity 30 gradually increases from the top molding part 321 to the hemming molding part 322, so that after the material shrinks during the molding process of the diaphragm, the molding thickness at the top molding part 321 and the hemming molding part 322 are the same. In turn, the final molding parameters of the diaphragm are the same as the design parameters, and the molding quality of the diaphragm is guaranteed.

In one embodiment, the molding thickness of the cavity 30 gradually increases from the middle of the top molding part 321 to the end of the hemming molding part 322 away from the top molding part 321, so that each part of the diaphragm has the same thickness after manufacturing and molding. The molding quality of the mold.

In one embodiment, the forming thickness of the top forming part 321 is the same, and the forming thickness of the hemming forming part 322 gradually increases from the connection with the top forming part 321 to the end far away from the top forming part 321, so that each part of the diaphragm is After manufacturing and molding, the thickness is consistent to ensure the molding quality of the mold.

The top forming part 321 and the hemming forming part 322 are enclosed to form a folded ring forming part 32. The folded ring forming part 32 is arranged in a ring shape between the upper mold 10 and the lower mold 20 as a whole, and the folded ring forming parts 32 communicate with each other, so that An integrated structure is formed between the folding ring forming parts 32 to ensure that the diaphragm manufactured by the mold of this embodiment is an integrated structure.

In one embodiment, the folded ring forming parts 32 that are annular as a whole are connected by the main body forming part 31 to form an integrated structure, so that a ring-shaped arch can be formed, and the middle parts of the ring-shaped arches are connected to each other to form an integrated structure. Diaphragm.

In one embodiment, the edge-folding forming part 322 and the top forming part 321 are smoothly transitionally connected to ensure the forming quality of the connection between the edge-folding forming part 322 and the top forming part 321 during the forming process of the diaphragm.

3 and 4, the upper mold 10 has a cubic structure as a whole, and the lower mold 20 has a cubic structure as a whole. The upper mold 10 has a first groove 11 formed on the side facing the lower mold. The bottom of the groove is further recessed in the direction away from the lower mold 20 to form a second groove 13. The middle of the second groove 13 is a flat structure 12, and the upper surface of the flat structure 12 is flush with the open end of the second groove 13 . The position of the lower mold 20 corresponding to the second groove 13 is arched to the upper mold 10 to form a protrusion 21. The depth of the second groove 13 is greater than the height of the protrusion 21. The protrusion 21 is ring-shaped, and the ring-shaped protrusion 21 surrounds The groove wall forming the groove 22 with a flat bottom surface has a flat structure outside the annular protrusion 21, and the protrusion 21 and the first groove 11 enclose a cavity 30.

In one embodiment, the second groove 13 is an annular groove, and the protrusion 21 is an annular protrusion corresponding to the second groove 13 to form a diaphragm having an annular arched structure.

In one embodiment, the side of the upper mold 10 facing the lower mold 20 is recessed in a direction away from the lower mold 20 to form a mounting groove 14. The mounting groove 14 is arranged around the first groove 11, and the lower mold 20 is clamped in the mounting groove 14. And it abuts against the bottom of the installation groove 14. Specifically, the bottom surface of the installation groove 14 is higher than the upper surface of the flat structure 12 and is flush with the open end of the first groove 11, and the size of the installation groove 14 matches the outer size of the lower mold 20. The annular protrusion 21, the groove 22, the first groove 11, the second groove 13 and the flat structure 12 jointly form a main body forming part 31 and a folding ring forming part 32, and the main body forming part 31 is connected to the folding ring forming part 32 forms a cavity 30.

The diaphragm forming mold of the present application can be used to manufacture a diaphragm with a uniform wall thickness of silicone material, rubber material or TPU material. It should also be noted that other polymer materials that have similar physical properties to TPU, rubber, and silicone in the injection, die-casting or casting process can also be used to produce a diaphragm with uniform wall thickness using the mold of the present application.

The above are only the implementation manners of this application. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of this application, but these all belong to this application. The scope of protection.

Claims

A diaphragm forming mold includes a cavity for forming a diaphragm. The diaphragm forming mold includes an upper mold and a lower mold. The upper mold and the lower mold are connected and enclosed to form the diaphragm for manufacturing the diaphragm. The cavity is characterized in that the cavity comprises a main body forming part and a folding ring forming part bent and extending from the periphery of the main body forming part, and the folding ring forming part includes a top forming part and a top forming part. The forming part is bent and extended at both ends of the edge forming part; the forming thickness of the top forming part is smaller than the forming thickness of the edge forming part, so that the diaphragm forming mold forms a uniform wall thickness after the manufacturing is completed.述 Vibration film.
4. The diaphragm forming mold according to claim 1, wherein the forming thickness of the folding ring forming part gradually increases from the top forming part to the hemming forming part.
The diaphragm forming mold according to claim 2, wherein the forming thickness of the folding ring forming part gradually increases from the middle part of the top forming part to the end of the hemming forming part away from the top forming part .
The diaphragm forming mold according to claim 2, wherein the forming thickness of the top forming part is the same, and the forming thickness of the hemming forming part extends from the connection point with the top forming part to away from the top forming part. Department gradually increased.
4. The diaphragm forming mold according to claim 4, wherein the hemming forming part and the top forming part are smoothly transitionally connected.
The diaphragm forming mold according to claim 1, wherein a first groove is formed inwardly on the side of the upper mold facing the lower mold, and the groove bottom of the first groove is away from the bottom of the first groove. The direction of the lower mold is further recessed to form a second groove, the position of the lower mold corresponding to the second groove is arched toward the upper mold to form a protrusion, and the depth of the second groove is greater than that of the protrusion The height of the protrusion and the first groove are enclosed to form the cavity.
7. The diaphragm forming mold according to claim 6, wherein the second groove is an annular groove, and the protrusion is an annular protrusion corresponding to the second groove.
The diaphragm forming mold according to claim 7, wherein the side of the upper mold facing the lower mold is recessed to form a mounting groove in a direction away from the lower mold, and the mounting groove surrounds the second mold. A groove is provided, and the lower die is clamped in the installation groove and abuts against the bottom of the installation groove.
4. The diaphragm forming mold according to claim 1, wherein the diaphragm forming mold can be used to manufacture a diaphragm made of silicone material, rubber material, or TPU material.