TW201808024A - Manufacturing method of loudspeaker membrane by preheating formation capable of shortening forming time of loudspeaker membrane to enhance manufacturing efficiency - Google Patents

Abstract

The invention provides a manufacturing method of loudspeaker membrane by preheating formation, which includes the steps of: impregnation, drying, preheating, thermal pressing formation, and cutting. In the impregnation step, the substrate is impregnated in the resin solution. In the drying step, the substrate is dried. In the preheating step, the substrate is preheated in an environment in which the preheating temperature is lower than the glass transition temperature of the resin. In the thermal pressing formation step, the substrate is heated and pressed to form a predetermined shape of loudspeaker membrane in an environment in which the formation temperature is higher than the glass transition temperature of the resin. In the cutting step, the predetermined shape of loudspeaker membrane is cut out from the substrate so as to obtain a loudspeaker membrane. Thus, the present invention employs the substrate containing both thermosetting resin and thermoplastic resin to shorten the forming time of the loudspeaker membrane and enhance the manufacturing efficiency, and the loudspeaker membrane made therefrom can eliminate the noise.

Description

Manufacturing method of pre-heated horn vibration piece

The invention relates to a method for manufacturing a horn vibrating piece, in particular to a method for manufacturing a pre-heated horn vibrating piece.

Please refer to FIG. 1, a typical typical dynamic coil horn 10 includes a power system, a drum paper 11 and a suspension system. The power system further includes: a magnet 15, a pole piece, an upper iron, a gap, and a voice coil 14. The drum paper 11 is a diaphragm for moving air, and is generally a cone-shaped or hemispherical sound cone. The suspension system is composed of structures such as the elastic wave 12 and the overhang 13 and is responsible for the directional movement of the traction diaphragm. The working principle is that when an electric current flows through the voice coil 14, an electromagnetic field is generated. This electromagnetic field is perpendicular to the magnetic field of the permanent magnet 15 on the horn, which causes the movable coil to be forced by the gap (the gap between the voice coil 14 and the magnet 15). ). The mechanical force generated by this movement causes the drum paper 11 attached to the voice coil 14 to move vertically (up and down) (vibration), so that the air vibrates to send audio to the human ear, achieving the purpose of sound restoration for human listening, and achieving The conversion of electrical energy to acoustic energy.

Generally, many kinds of non-metal parts included in the horn 10 are made of cloth substrates. The main reason is that the specially processed cloth substrates have appropriate elasticity and strength, and can provide the functions required by the horns. For example, Drum paper 11, elastic wave 12, ... belong to this category, such non-metallic parts are collectively called horn vibrating pieces. The horn vibrating piece is made by impregnating resin, drying, hot pressing, and cutting through a cloth substrate. Among them, the conventional step of forming a horn vibrating piece is to move the substrate to a hot-press forming device. The hot-press forming device includes a forming device and a heating device. The upper mold and the lower mold of the forming device are closed with each other, so that the substrate is pressed between the upper and lower molds. At the same time, the heating device is also energized to raise the temperature of the upper and lower molds, so that the substrate containing the resin is raised. Due to pressure and heating, the shape of a horn vibrating piece such as a wave or drum paper is formed. An advantage of such a method for manufacturing a horn vibrating piece is that it is possible to hot press-mold a substrate containing a thermoplastic resin and a substrate containing a thermosetting resin at the same time.

However, when the hot-press forming device heats the substrate under pressure, the required heating temperature is about 200 ° C, and the pressure heating time for each time is about 10 seconds; in other words, each set of molds stays on the substrate for forming The minimum time is 10 seconds, only six parts can be formed in one minute, and only 360 pieces can be formed per hour. If the time required for the substrate to be transported is added, the output per hour can be produced. The number of parts is definitely less than 360. In addition, if the aforementioned heating temperature is lower, in order to obtain the same molding effect, the time for the upper and lower molds to press the substrate needs to be prolonged. Efficiency will decrease. In order not to damage the properties of the substrate, the aforementioned heating temperature should not be too high. Because of this, the conventional manufacturing method of the horn vibrating piece has not been able to improve production efficiency for a long time.

In response to this, the inventor of this case then developed a method for manufacturing a preheated formed horn vibrating plate, which is added between the drying and forming steps to add a preheating step to preheat the glass transition temperature "above" the resin The temperature preheats the base material, so that the resin is properly softened and has the property of plastic deformation. Then, during the forming step, the base material can be press-molded at room temperature as the forming temperature, thereby shortening the time for forming the horn vibrating piece. To improve the manufacturing efficiency of the horn vibrating piece.

It should be understood that the characteristics of thermosetting resins are that if the heating temperature exceeds the glass transition temperature, it will become a viscous liquid that can be softened or flowed. It has plasticity, but will gradually solidify and form. Once cured, it cannot be softened or flowed again by heating under pressure. That is, preheating at a preheating temperature higher than the glass transition temperature of the resin will cause the thermosetting resin to solidify in the preheating step, and subsequent steps such as forming and cutting cannot be performed. It is conceivable that the manufacturing method of such pre-heated horn vibrating piece is not suitable A horn vibrating reed is manufactured by combining a base material containing a thermosetting resin, and is only suitable for a horn vibrating reed by a base material containing a thermoplastic resin.

In view of this, how to provide a pre-heated forming method of a horn vibrating piece, which can simultaneously provide a substrate containing a thermosetting resin and a substrate containing a thermoplastic resin to shorten the time for forming the horn vibrating piece and improve the manufacturing efficiency of the horn vibrating piece This is a problem that people in this field need to overcome.

The main purpose of the present invention is to provide a method for manufacturing a pre-heated horn vibrating piece, and simultaneously provide a substrate containing a thermosetting resin and a thermoplastic resin to shorten the time for forming the horn vibrating piece and improve the manufacturing efficiency.

In order to achieve the foregoing objective, the present invention provides a method for manufacturing a preheated horn vibrating piece, including the following steps: impregnation: a substrate is impregnated with a resin solution; drying: drying the substrate; preheating: The substrate is preheated in an environment where the preheating temperature is lower than the glass transition temperature of the resin; hot press forming: under an environment where the forming temperature is higher than the glass transition temperature of the resin, the substrate is heated and heated. Press forming a predetermined shape of at least one horn vibrating piece; and cutting: cutting the predetermined shape of the horn vibrating piece from the substrate to obtain a horn vibrating piece.

According to a preferred embodiment, the resin is a thermosetting resin, the preheating temperature is lower than the glass transition temperature of the thermosetting resin, and the forming temperature is higher than the glass transition temperature of the thermosetting resin. Preferably, the glass transition temperature of the thermosetting resin is that of all kinds of thermosetting resin glass Mean value of conversion temperature. Preferably, the glass transition temperature of the thermosetting resin is a glass transition temperature of a specific type of thermosetting resin.

According to a preferred embodiment, the resin is a thermoplastic resin, the preheating temperature is lower than the glass transition temperature of the thermoplastic resin, and the forming temperature is higher than the glass transition temperature of the thermoplastic resin. Preferably, the glass transition temperature of the thermoplastic resin is an average value of the glass transition temperatures of all kinds of thermoplastic resins. Preferably, the glass transition temperature of the thermoplastic resin is the glass transition temperature of a specific type of thermoplastic resin.

According to a preferred embodiment, the glass transition temperature of the resin is an average value of the glass transition temperatures of all kinds of resins, the preheating temperature is lower than the average value of the glass transition temperatures of all kinds of resins, and the forming temperature is high The average glass transition temperature for all types of resins.

The effect of the invention is that it can simultaneously provide a substrate containing a thermosetting resin and a substrate containing a thermoplastic resin to shorten the time for forming the horn vibrating piece, improve the manufacturing efficiency of the horn vibrating piece, and indeed improve the problems existing in the prior art. The manufactured horn vibration plate also has an unexpected effect of eliminating noise.

10‧‧‧ Horn

11‧‧‧ drum paper

12‧‧‧ Bomb

13‧‧‧overhang

14‧‧‧voice coil

15‧‧‧permanent magnet

20‧‧‧ substrate

30‧‧‧resin solution

40‧‧‧ drying device

50‧‧‧ preheating device

60‧‧‧Hot press forming device

70‧‧‧ cutting device

80‧‧‧horn vibrating piece

FIG. 1 is a schematic diagram of a horn structure.

FIG. 2 is a flowchart of a method for manufacturing a pre-heated horn vibrating piece according to the present invention.

FIG. 3 is a perspective view of a horn elastic wave produced by applying the pre-heated horn vibration piece manufacturing method of the present invention.

The following describes the embodiments of the present invention in more detail with reference to the drawings and component symbols, so that those skilled in the art can implement them after studying this specification.

Please refer to FIG. 2, which is a flowchart of a method for manufacturing a pre-heated horn vibrating piece according to the present invention. The invention provides a method for manufacturing a pre-heated horn vibrating piece, which includes the following steps: impregnation: a substrate 20 is impregnated with a resin solution 30.

Drying: drying the substrate 20. More specifically, the substrate 20 is moved to a drying device 40, so that the resin on the substrate 20 is dried, so that the substrate has appropriate hardness, elasticity, and toughness.

Preheating: Preheat the substrate in an environment where the preheating temperature is lower than the glass transition temperature of the resin. More specifically, the dried substrate 20 is moved to a preheating device 50. The preheating device 50 provides a preheating temperature that is lower than the glass transition temperature of the resin, so that the substrate 20 is at a preheating temperature that is lower than the glass of the resin. Preheat under the environment of conversion temperature.

Hot press forming: Under an environment where the forming temperature is higher than the glass transition temperature of the resin, at least one horn vibrating piece is formed into a predetermined shape by heating and pressing on a substrate. More specifically, the preheated substrate 20 is moved to a hot-press forming device 60. The hot-press forming device 60 includes a heating structure and a forming mold. The forming mold includes an upper mold and a lower mold. The heating structure provides a The forming temperature higher than the glass transition temperature of the resin heats the upper and lower molds of the forming mold. The upper and lower molds of the forming mold provide the substrate 20 with heat and pressure in an environment where the forming temperature is higher than the glass transition temperature of the resin. A predetermined shape of a horn vibrating piece is formed on the base material 20.

Cutting: Cut the predetermined shape of the horn vibration piece from the substrate to obtain a horn vibration piece. More specifically, the substrate 20 is moved to a cutting device 70, and the predetermined shape of the horn vibrating piece is cut from the substrate 20 by the cutting device 70 to obtain the horn vibrating piece 80.

The horn vibrating piece 80 formed in FIGS. 2 and 3 is an elastic wave. Other types of horn vibrating pieces 80, such as the drum paper 11 or the overhang 13 shown in FIG. 1, can also be manufactured from the base material 20 and the aforementioned various devices. The difference is that the shape of the mold of the hot press forming device 60 is It is different according to different types of horn vibrating pieces 80.

Among them, resins can be divided into thermosetting resins and thermoplastic resins according to their properties.

In a preferred embodiment, the resin is a thermosetting resin, and the preheating temperature is lower than the glass transition temperature of the thermosetting resin. Therefore, in the preheating step, the substrate containing the thermosetting resin can not only achieve the purpose of preheating, but also will not be converted into a viscous liquid with plasticity, so it will not be cured. Moreover, the forming temperature is higher than the glass transition temperature of the thermosetting resin. Therefore, during the hot-press forming step, since the substrate containing the thermosetting resin has been preheated to a certain temperature, it can be quickly heated above its glass transition temperature and softened appropriately to be transformed into a viscous material with plastic deformation properties. It is liquid and pressurized to form a predetermined shape of the horn vibrating piece.

Since there are many types of thermosetting resins, the glass transition temperature of the thermosetting resin may be an average value of the glass transition temperatures of all types of thermosetting resins, or may be the glass transition temperature of a specific type of thermosetting resin.

Wherein, when the glass transition temperature of the thermosetting resin is an average value of the glass transition temperatures of all kinds of thermosetting resins, the preheating temperature is lower than the average value of the glass transition temperatures of all kinds of thermosetting resins, and the forming temperature Above the average glass transition temperature of all kinds of thermosetting resins. With this, the preheating temperature and the forming temperature will be applicable to substrates containing different types of thermosetting resins, without any adjustments, and shortening the molding time for manufacturing horn vibrating pieces containing different types of thermosetting resins. In order to improve the manufacturing efficiency of horn vibrating pieces containing different types of thermosetting resins.

Wherein, compared with the technical characteristic of "the glass transition temperature of the thermosetting resin is the average value of the glass transition temperatures of all kinds of thermosetting resins", when the glass transition temperature of the thermosetting resin is that of a specific type of thermosetting resin, At the glass transition temperature, the preheating temperature is lower than the glass transition temperature of a specific type of thermosetting resin, and the forming temperature is higher than the glass transition temperature of a specific type of thermosetting resin. As a result, the preheating temperature and the forming temperature can be more targeted to a substrate containing a specific type of thermosetting resin, and the temperature of the substrate containing a specific type of thermosetting resin can be further shortened. The forming time of the horn vibrating piece to improve the manufacturing efficiency of the horn vibrating piece containing a specific type of thermosetting resin.

In a preferred embodiment, the resin is a thermoplastic resin, and the preheating temperature is lower than the glass transition temperature of the thermoplastic resin. Therefore, in the preheating step, the substrate containing the thermoplastic resin can not only achieve the purpose of preheating, but also not be converted into a viscous liquid with plasticity. Moreover, the forming temperature is higher than the glass transition temperature of the thermoplastic resin. In this way, during the hot-press forming step, since the substrate containing the thermoplastic resin has been preheated to a certain temperature, it can be quickly heated above its glass transition temperature and softened appropriately to be converted into a viscous material with plastic deformation properties. It is liquid and pressurized to form a predetermined shape of the horn vibrating piece.

Since there are many types of thermoplastic resins, the glass transition temperature of the thermoplastic resin may be an average value of the glass transition temperatures of all types of thermoplastic resins, or may be the glass transition temperature of a specific type of thermoplastic resin.

Wherein, when the glass transition temperature of the thermoplastic resin is an average value of the glass transition temperatures of all types of thermoplastic resins, the preheating temperature is lower than the average value of the glass transition temperatures of all types of thermoplastic resins, and the forming temperature Above the average glass transition temperature of all types of thermoplastic resins. With this, the preheating temperature and the forming temperature will be applicable to substrates containing different types of thermoplastic resins, without any adjustments, and shortening the molding time for manufacturing horn vibrating pieces containing different types of thermoplastic resins. In order to improve the manufacturing efficiency of the horn vibrating piece containing different types of thermoplastic resin.

Wherein, compared with the technical characteristic of "the glass transition temperature of the thermoplastic resin is the average of the glass transition temperatures of all kinds of thermoplastic resins", when the glass transition temperature of the thermoplastic resin is At the glass transition temperature, the preheating temperature is lower than the glass transition temperature of a specific type of thermoplastic resin, and the forming temperature is higher than the glass transition temperature of a specific type of thermoplastic resin. Thereby, the preheating temperature and the forming temperature can be more targeted The base material containing a specific type of thermoplastic resin can further shorten the forming time of the horn vibrating piece containing a specific type of thermoplastic resin, so as to improve the manufacturing efficiency of the horn vibrating piece containing a specific type of thermoplastic resin.

In a preferred embodiment, the glass transition temperature of the resin is an average value of the glass transition temperatures of all kinds of resins (that is, including thermosetting resins and thermoplastic resins), and the preheating temperature is lower than all kinds of resins. The average value of the glass transition temperature of the above, the forming temperature is higher than the glass transition temperature of all kinds of resins. In this way, the preheating temperature and the forming temperature will be applicable to substrates containing different types of resins, without any adjustments, and shortening the molding time for the manufacture of horn vibrating pieces containing different types of resins to improve Manufacturing efficiency of horn vibrating pieces containing different kinds of resin.

To sum up, the method for manufacturing a pre-heated horn vibrating piece of the present invention can provide both a substrate containing a thermosetting resin and a thermoplastic resin because the pre-heating temperature is lower than the glass transition temperature of the resin and the molding temperature is higher than the glass transition temperature of the resin. The resin base material shortens the time for forming the horn vibrating piece, improves the manufacturing efficiency of the horn vibrating piece, and indeed improves the problems existing in the prior art. Moreover, the manufactured horn vibrating piece also has an unexpected effect of eliminating noise.

The above are only used to explain the preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Therefore, any modification or change related to the present invention made under the same creative spirit Should still be included in the scope of the present invention.

20‧‧‧ substrate

30‧‧‧resin solution

40‧‧‧ drying device

50‧‧‧ preheating device

60‧‧‧Hot press forming device

70‧‧‧ cutting device

80‧‧‧horn vibrating piece

Claims (8)

A method for manufacturing a pre-heated horn vibrating piece includes the following steps: impregnation: a substrate is impregnated with a resin solution; drying: drying the substrate; preheating: glass transition at a preheating temperature lower than the resin Preheating the substrate under the environment of temperature; hot press forming: under an environment where the forming temperature is higher than the glass transition temperature of the resin, heating and pressing on the substrate to form at least one predetermined shape of the horn vibrating piece And cutting: cutting the horn vibrating piece into a predetermined shape from the substrate to obtain a horn vibrating piece. The method for manufacturing a pre-heated shaped horn vibrating piece according to item 1 of the scope of patent application, wherein the resin is a thermosetting resin, the pre-heating temperature is lower than the glass transition temperature of the thermosetting resin, and the forming temperature is higher than that of the glass of the thermosetting resin Conversion temperature. The method for manufacturing a pre-heated horn vibrating piece according to item 2 of the scope of patent application, wherein the glass transition temperature of the thermosetting resin is an average value of the glass transition temperatures of all kinds of thermosetting resins. The method for manufacturing a pre-heated horn vibrating piece according to item 2 of the scope of patent application, wherein the glass transition temperature of the thermosetting resin is a glass transition temperature of a specific type of thermosetting resin. The method for manufacturing a pre-heated horn vibrating piece according to item 1 of the scope of patent application, wherein the resin is a thermoplastic resin, and the pre-heating temperature is lower than the thermoplastic resin The glass transition temperature is higher than the glass transition temperature of the thermoplastic resin. The method for manufacturing a pre-heated horn vibrating piece according to item 5 of the scope of patent application, wherein the glass transition temperature of the thermoplastic resin is an average value of the glass transition temperatures of all types of thermoplastic resins. The method for manufacturing a pre-heated horn vibrating piece according to item 5 of the scope of the patent application, wherein the glass transition temperature of the thermoplastic resin is a glass transition temperature of a specific type of thermoplastic resin. The method for manufacturing a pre-heated horn vibrating piece according to item 1 of the scope of patent application, wherein the glass transition temperature of the resin is an average value of the glass transition temperatures of all kinds of resins, and the pre-heating temperature is lower than that of all kinds of resins. The average value of the glass transition temperature of the resin is higher than the average value of the glass transition temperature of all kinds of resins.