Vibrating diaphragm forming die

Abstract

The utility model relates to a vibrating diaphragm forming die, which belongs to the technical field of vibrating diaphragm forming dies, and comprises an upper die holder, a compression pad and a lower die holder, the compression pad is arranged between the upper die holder and the lower die holder, the upper die holder is provided with an arc-shaped bulge, the compression pad comprises a plane part, and arc-shaped parts are respectively arranged on two sides of the plane part. An arc-shaped protrusion is arranged between the upper die base and the lower die base, an arc-shaped portion is arranged under the arc-shaped protrusion and matched with the arc-shaped protrusion, arc-shaped grooves are formed in the two sides of the lower die base respectively, and the arc-shaped grooves are arranged under the arc-shaped portion and matched with the arc-shaped portion. Different pressures are provided for different areas of the vibrating diaphragm folding ring, and the vibrating diaphragm forming precision and consistency are better.

Description

Technical Field

[0001] The utility model relates to a diaphragm forming mold and belongs to the technical field of diaphragm forming molds. Background Art

[0002] The existing micro-speaker rubber diaphragm molding is generally performed by coating the rubber into a thin film and then hot pressing. There are two types of hot pressing mold designs: one is that both the upper and lower mold bases are hot-pressed with metal molds. Due to the extremely high requirements on mold precision, difficult processing and high cost pressure, it is difficult to popularize and apply; the other is that the lower mold base uses a metal mold and the upper mold base uses air pressure molding. With this air pressure method, the surface pressure of the mold is uniform, but the pressure required for different positions of the diaphragm is different due to the difference in shape. If the pressure is too high, it will cause the diaphragm to stick to the mold, break the film and other problems. If the pressure is too low, it will cause air pressure molding to produce local molding problems such as incomplete and unclear molding. Summary of the invention

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional technology and provide a diaphragm molding mold. A compression pad is arranged between the upper and lower mold bases. Different compression ratios are set by the compression pad at different positions of the diaphragm fold ring, and different pressures are provided to different areas of the diaphragm fold ring, so that the diaphragm molding accuracy and consistency are better.

[0004] The purpose of the utility model is achieved through the following technical measures: a diaphragm forming mold, including an upper mold base, a compression pad and a lower mold base, the compression pad is arranged between the upper mold base and the lower mold base, the upper mold base is provided with an arc-shaped protrusion, the compression pad includes a plane portion, arc-shaped portions are respectively provided on both sides of the plane portion, the arc-shaped portions are arranged directly below the arc-shaped protrusion and cooperate with it, and arc-shaped grooves are respectively provided on both sides of the lower mold base, the arc-shaped grooves are arranged directly below the arc-shaped portion and cooperate with it.

[0005] As a further improvement of the above technical solution:

[0006] The lower part of the upper die seat is a plane, and limiting bosses are respectively arranged on both sides of the lower part of the upper die seat.

[0007] The limiting bosses on both sides are symmetrically arranged along the central axis of the upper die seat.

[0008] The length of the compression pad is equal to the distance between the two limiting bosses.

[0009] The arc-shaped protrusion is arranged between the limiting bosses on both sides.

[0010] The arc-shaped portion includes a side portion and a bottom portion.

[0011] The thicknesses of the side portion and the bottom portion are h2 and h3 respectively, the thickness of the plane portion is h1, h2 / h1=1~1.5, h3 / h2=1~1.5.

[0012] The ratio of the compression pad hardness (A0) to the diaphragm material hardness (A1) is A0 / A1=0.6-1.2.

[0013] The compression pad is made of one of rubber, nylon, and thermoplastic elastomer materials, or a foamed material based on the above materials.

[0014] The upper die seat is made of one of copper, aluminum and stainless steel.

[0015] Due to the adoption of the above technical solution, compared with the prior art, the advantages of the utility model are:

[0016] 1. A compression pad is set between the upper and lower mold bases. Different compression ratios are set at different positions of the diaphragm fold through the compression pad, which is conducive to the molding of soft materials such as rubber films;

[0017] 2. The compression ratio of the corresponding compression pad position increases in the area where the diaphragm ring is stretched to a greater extent; the compression ratio of the corresponding compression pad position decreases in the area where the diaphragm ring is stretched to a smaller extent; pressure molding with different gradients is formed, the diaphragm molding state is more uniform, and the diaphragm molding accuracy and consistency are better.

[0018] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the explosion structure of a diaphragm forming mold in an embodiment of the utility model;

[0020] Figure 2 It is a schematic cross-sectional view of the upper die seat and the compression pad in the embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of a diaphragm forming mold when pressed together in an embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the diaphragm after molding.

[0023] In the figure, 1-upper die seat, 2-compression pad, 3-lower die seat, 4-limiting boss, 5-arc-shaped protrusion, 6-flat portion, 7-arc-shaped portion, 8-arc-shaped groove, 9-side portion, 10-bottom, 11-diaphragm flat portion, 12-diaphragm arc-shaped portion. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. Example

[0027] like Figure 1-4 As shown, a diaphragm forming mold includes an upper mold base 1, a compression pad 2 and a lower mold base 3. The compression pad 2 is arranged between the upper mold base 1 and the lower mold base 3. The lower part of the upper mold base 1 is a plane. Limiting bosses 4 are respectively provided on both sides of the lower part of the upper mold base 1 to control the overall compression ratio of the compression pad 2. The size of the compression ratio is selected according to the hardness and thickness of the membrane material. The limiting bosses 4 on both sides are symmetrically arranged along the central axis of the upper mold base 1, and the length of the compression pad 2 is equal to the distance between the two limiting bosses 4.

[0028] An arc-shaped protrusion 5 is provided on the upper die base 1 between the limiting bosses 4 on both sides. There are two arc-shaped protrusions 5, and the two arc-shaped protrusions 5 are symmetrically arranged along the central axis of the upper die base 1. The compression pad 2 includes a planar portion 6, and arc-shaped portions 7 are respectively provided on both sides of the planar portion 6. The arc-shaped portions 7 are arranged directly below the arc-shaped protrusion 5 and cooperate with it. Arc-shaped grooves 8 are respectively provided on both sides of the lower die base 3, and the two arc-shaped grooves 8 are respectively arranged directly below the two arc-shaped portions 7 and cooperate with them.

[0029] The arc-shaped portion 7 includes a side portion 9 and a bottom portion 10, the thicknesses of the side portion 9 and the bottom portion 10 are h2 and h3 respectively, the thickness of the planar portion 6 is h1, and h2 / h1=1~1.5; the selection of this ratio increases with the increase in the hardness of the diaphragm material; h3 / h2=1~1.5; when the diaphragm folding ring height is high, the membrane material hardness is high, the membrane material thickness is thick, etc., it will cause the folding ring bottom 10 to be difficult to form. At this time, h3 / h2 can be increased to increase the compression ratio of the compression pad 2 at the folding ring bottom 10 position.

[0030] The upper mold base 1 can be made of metal materials such as copper, aluminum, stainless steel, etc. that can be used for mold processing; the compression pad 2 is a foam body of high temperature resistant material, and the material can be rubber, nylon, thermoplastic elastomer material, etc., or a foam material based on the above materials. The ultimate compression ratio of the compression pad 2 is preferably 3-5 times. Too small will cause excessive pressure on the diaphragm and damage the diaphragm, and too large will cause insufficient pressure and the problem of inadequate diaphragm molding. The hardness of the compression pad 2 is selected based on the hardness of the product diaphragm material. The ratio of the hardness of the compression pad 2 (A0) to the hardness of the diaphragm material (A1) is A0 / A1=0.6-1.2.

[0031] During pressing, the lower mold base 3 is pressed into contact with the limiting boss 4 of the upper mold base 1, and the compression pad 2 reaches a completely pressed state, from top to bottom: the upper mold base 1, the compression pad 2, the diaphragm, and the lower mold base 3. After pressing, the diaphragm flat part 11 and the diaphragm arc part 12 are obtained.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A diaphragm forming mold, characterized in that: The present invention comprises an upper die base (1), a compression pad (2) and a lower die base (3), wherein the compression pad (2) is arranged between the upper die base (1) and the lower die base (3), wherein an arc-shaped protrusion (5) is arranged on the upper die base (1), and the compression pad (2) comprises a plane portion (6), wherein arc-shaped portions (7) are respectively arranged on both sides of the plane portion (6), and the arc-shaped portions (7) are arranged directly below the arc-shaped protrusion (5) and cooperate therewith, and wherein arc-shaped grooves (8) are respectively arranged on both sides of the lower die base (3), and the arc-shaped grooves (8) are arranged directly below the arc-shaped portion (7) and cooperate therewith.

2. The diaphragm forming mold according to claim 1, characterized in that: The lower part of the upper die seat (1) is a plane, and limiting bosses (4) are respectively provided on both sides of the lower part of the upper die seat (1).

3. The diaphragm forming mold according to claim 2, characterized in that: The limiting bosses (4) on both sides are symmetrically arranged along the central axis of the upper die seat (1).

4. The diaphragm forming mold according to claim 3, characterized in that: The length of the compression pad (2) is equal to the distance between the two limiting bosses (4).

5. The diaphragm forming mold according to claim 3, characterized in that: The arc-shaped protrusion (5) is arranged between the limiting bosses (4) on both sides.

6. The diaphragm forming mold according to claim 1, characterized in that: The arc-shaped portion (7) comprises a side portion (9) and a bottom portion (10).

7. The diaphragm forming mold according to claim 6, characterized in that: The thicknesses of the side portion (9) and the bottom portion (10) are h2 and h3 respectively, the thickness of the plane portion (6) is h1, and h2 / h1=1-1.5, and h3 / h2=1-1.

5.

8. The diaphragm forming mold according to claim 1, characterized in that: The ratio of the hardness (A0) of the compression pad (2) to the hardness (A1) of the diaphragm material is A0 / A1=0.6-1.

2.

9. The diaphragm forming mold according to claim 1, characterized in that: The compression pad (2) is one of rubber, nylon, and thermoplastic elastomer materials, or a foamed material based on the above materials.

10. The diaphragm forming mold according to claim 1, characterized in that: The upper die seat (1) is made of one of copper, aluminum and stainless steel.

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