A method for bonding metal ring and diaphragm with adhesive film in the production of acoustic devices

Abstract

The present invention provides a process for bonding metal rings and diaphragms used in the production of acoustic devices, and relates to the technical field of acoustic device production. The process for bonding metal rings and diaphragms used in the production of acoustic devices based on the use of adhesive film, the bonding steps are: S1. Continuously unfold and flatten the curled metal ring raw material sheet through an unfolding device, and use a high-pressure airflow through a jet device to remove dust and other impurities on the sheet when the unfolded sheet moves forward; S2. Set an adhesive film roll above the moving path of the sheet, and fix one end of the adhesive film with a clamp. By compounding the adhesive film on the metal plate for processing the metal ring, a large number of metal rings with bonding surfaces can be processed at one time, without the need to use glue to stick the metal rings one by one, and can be quickly assembled, which greatly improves the bonding efficiency between the metal ring and the diaphragm and improves the novelty of the process.

Description

Technical Field

[0001] The invention relates to the technical field of loudspeaker processing, and in particular to an adhesive film bonding process for a metal ring and a diaphragm in the production of acoustic devices. Background Art

[0002] The sound device is a voice coil that inputs a sinusoidal current, which is converted into a changing magnetic field by the coil, thereby generating a changing force in the magnetic field to push the diaphragm, which vibrates and produces sound. The common practice on the market is to glue the voice coil to a flexible diaphragm, and then route the voice coil wires through the diaphragm with glue, or route them in the air across the diaphragm.

[0003] The existing technology has at least the following problems: during the speaker processing, glue cannot be used in the printing process and can only be applied, and the application efficiency is low. The concentration and amount of glue used to bond the voice coil and diaphragm cannot be accurately controlled, and the glue application range is also difficult to control. The glue application efficiency is low and it is easy to emit harmful gases, affecting the health of workers. At the same time, the glue will cause the power resistance of the voice coil to decrease and the consistency of the product to be poor. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a process for bonding a metal ring to a diaphragm using an adhesive film for use in the production of acoustic devices, which solves the problems described in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a process for bonding a metal ring and a diaphragm with an adhesive film used in the production of acoustic devices, wherein the bonding steps are:

[0008] S1. The curled metal ring raw material sheet is continuously unfolded and flattened by an unfolding device, and dust and other impurities on the sheet are removed by a jet device using a high-pressure airflow when the unfolded sheet moves forward;

[0009] S2. A film roll is arranged above the moving path of the sheet, and one end of the film is fixed by a clamp, and a lifting roller device is arranged above the film. When the sheet moves below the clamp, a pressing device is used to press the adhesive surface of the output end of the film above the sheet, and the portion connected to the clamp is cut off;

[0010] S3. When the cleaned sheet passes through, the film is pasted on the top of the sheet as a whole by a rolling device, and then a second rolling device is used to remove possible bubbles;

[0011] S4. The upper layer of the sheet with the film attached continues to move forward to the stamping device, and then the release paper on the upper layer of the film is peeled off by the film peeling device, and the sheet is punched into multiple metal rings with film at one time by the stamping device;

[0012] S5. After the stamping is completed, the metal rings stamped on the sheet are promptly removed by the separation equipment, and the sheet waste is re-rolled by the coiling equipment;

[0013] S6. Use a certain amount of pressure to press the metal ring onto the stretched diaphragm, and use a hot pressing device to perform hot pressing once or twice to bond the metal ring to the diaphragm.

[0014] Preferably, the adhesive film is a hot melt adhesive film with a silicone paper protective film (release paper) on the outside and a thermosetting polyurethane film on the inside.

[0015] Preferably, the plate is a metal plate with a thickness of 0.1-2.0 mm.

[0016] Preferably, the surface energy of the metal sheet is at least 20 mN / m.

[0017] Preferably, in step six, the primary hot pressing temperature ranges from 50 to 120° C., and the hot pressing pressure ranges from 15 to 75 N / cm.

[0018] Preferably, in step 6, the secondary hot pressing temperature range is 100°C–160°C (158°F–248°F), and the hot pressing pressure is 15–75 N / cm 2 .

[0019] (III) Beneficial effects

[0020] The present invention provides a film bonding process for metal rings and diaphragms used in the production of acoustic devices. The process has the following beneficial effects:

[0021] 1. The present invention can process a large number of metal rings with adhesive surfaces at one time by compounding the adhesive film on the metal plate for processing the metal rings. There is no need to use glue to stick the metal rings one by one, and the metal rings can be assembled quickly, which greatly improves the bonding efficiency between the metal rings and the diaphragm and improves the novelty of the process.

[0022] 2. The adhesive film used in the present invention is a hot-melt adhesive film. Before being pasted with the diaphragm, the adhesive film will not stick to the diaphragm at room temperature. It does not contain benzene, phenols, toluene and formaldehyde, and will not emit harmful gases to affect the health of workers. At the same time, the adhesive film can also improve the bonding strength by reacting with water molecules in the air, thereby improving the practicability of the process. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] The embodiment of the present invention provides a process for bonding a metal ring and a diaphragm with an adhesive film used in the production of an acoustic device, and the bonding steps are as follows:

[0026] S1. The curled metal ring raw material sheet is continuously unfolded and flattened by an unfolding device, and dust and other impurities on the sheet are removed by a jet device using a high-pressure airflow when the unfolded sheet moves forward;

[0027] S2. A film roll is arranged above the moving path of the sheet, and one end of the film is fixed by a clamp, and a lifting roller device is arranged above the film. When the sheet moves below the clamp, a pressing device is used to press the adhesive surface of the output end of the film above the sheet, and the portion connected to the clamp is cut off;

[0028] S3. When the cleaned sheet passes through, the film is pasted on the top of the sheet as a whole by a rolling device, and then a second rolling device is used to remove possible bubbles;

[0029] S4. The upper layer of the sheet with the film attached continues to move forward to the stamping device, and then the release paper on the upper layer of the film is peeled off by the film peeling device, and the sheet is punched into multiple metal rings with film at one time by the stamping device;

[0030] S5. After the stamping is completed, the metal rings stamped on the sheet are promptly removed by the separation equipment, and the sheet waste is re-rolled by the coiling equipment;

[0031] S6. Use a certain amount of pressure to press the metal ring onto the stretched diaphragm, and use a hot pressing device to perform hot pressing twice to bond the metal ring to the diaphragm.

[0032] The adhesive film is a hot melt adhesive film with a silicone paper protective film (isolation paper) on the outside and a thermosetting polyurethane film on the inside. The plate is a metal plate with a thickness of 2.0 mm. The surface energy of the metal plate is at least 38 mN / m. In step 6, the hot pressing temperature range is 50°C and the hot pressing pressure is 15 N / cm 2 The secondary hot pressing temperature range is 100℃ and the hot pressing pressure is 75N / cm 2 .

[0033] The technical parameters of the film are:

[0034]

[0035] Embodiment 2:

[0036] The difference between this embodiment and the first embodiment is that: a process for bonding a metal ring and a diaphragm with an adhesive film used in the production of an acoustic device, the bonding steps are:

[0037] S1. The curled metal ring raw material sheet is continuously unfolded and flattened by an unfolding device, and dust and other impurities on the sheet are removed by a jet device using a high-pressure airflow when the unfolded sheet moves forward;

[0038] S2. A film roll is arranged above the moving path of the sheet, and one end of the film is fixed by a clamp, and a lifting roller device is arranged above the film. When the sheet moves below the clamp, a pressing device is used to press the adhesive surface of the output end of the film above the sheet, and the portion connected to the clamp is cut off;

[0039] S3. When the cleaned sheet passes through, the film is pasted on the top of the sheet as a whole by a rolling device, and then a second rolling device is used to remove possible bubbles;

[0040] S4. The upper layer of the sheet with the film attached continues to move forward to the stamping device, and then the release paper on the upper layer of the film is peeled off by the film peeling device, and the sheet is punched into multiple metal rings with film at one time by the stamping device;

[0041] S5. After the stamping is completed, the metal rings stamped on the sheet are promptly removed by the separation equipment, and the sheet waste is re-rolled by the coiling equipment;

[0042] S6. Use a certain amount of pressure to press the metal ring onto the stretched diaphragm, and use a hot pressing device to perform hot pressing once to bond the metal ring to the diaphragm.

[0043] The adhesive film is a hot melt adhesive film with a silicone paper protective film (release paper) on the outside and a thermosetting polyurethane film on the inside. The plate is a metal plate with a thickness of 2.0 mm. The surface energy of the metal plate is at least 20 mN / m. In step 6, the hot pressing temperature range is 160°C and the hot pressing pressure is 75 N / cm 2 , shortening the hot pressing time, improving assembly efficiency, and not affecting the subsequent enhancement of bonding strength, but the strength is lower when leaving the factory.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for bonding a metal ring and a diaphragm with an adhesive film in the production of acoustic devices, characterized in that: The bonding steps are: S1. The curled metal ring raw material sheet is continuously unfolded and flattened by an unfolding device, and impurities on the sheet are removed by a jet device using a high-pressure airflow when the unfolded sheet moves forward; S2. A film roll is arranged above the moving path of the sheet, and one end of the film is fixed by a clamp, and a lifting roller device is arranged above the film. When the sheet moves to the bottom of the clamp, a pressing device is used to press the adhesive surface of the output end of the film above the sheet, and the part connected to the clamp is cut off; the film is a hot melt adhesive film with a silicone paper protective film on the outside and a polyurethane film on the inside, and the silicone paper protective film serves as a release paper; S3. When the cleaned sheet passes through, the film is pasted on the top of the sheet as a whole by a rolling device, and then a second rolling device is used to remove possible bubbles; S4. The upper layer of the sheet with the film attached continues to move forward to the stamping device, and then the release paper on the upper layer of the film is peeled off by the film peeling device, and the sheet is punched into multiple metal rings with film at one time by the stamping device; S5. After the stamping is completed, the metal rings stamped on the sheet are promptly removed by the separation equipment, and the sheet waste is re-rolled by the coiling equipment; S6. Use a certain amount of pressure to press the metal ring onto the stretched diaphragm, and use a hot pressing device to perform hot pressing once or twice to bond the metal ring to the diaphragm.

2. The method for bonding a metal ring to a diaphragm with an adhesive film used in the production of an acoustic device according to claim 1, characterized in that: The plate is a metal plate with a thickness of 0.1-2.0 mm.

3. The method for bonding a metal ring to a diaphragm with an adhesive film used in the production of an acoustic device according to claim 2, characterized in that: The surface energy of the metal sheet is at least 20 mN / m.

4. The method for bonding a metal ring to a diaphragm with an adhesive film used in the production of an acoustic device according to claim 1, characterized in that: In step S6, the primary hot pressing temperature range is 50-120°C, and the hot pressing pressure is 15-75N / cm 2 .

5. The method for bonding a metal ring to a diaphragm with an adhesive film used in the production of an acoustic device according to claim 1, characterized in that: In step S6, the secondary hot pressing temperature range is 100°C-160°C, and the hot pressing pressure is 15-75N / cm 2 .

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