Sound generating device and preparation method of metal plastic part

A technology for sounding devices and plastic parts, applied in the direction of metal material diaphragms, microphones, electrical components, etc., can solve the problem of decreased waterproof performance and sealing performance of speaker modules, deterioration of waterproof performance and sealing performance of speaker modules, large material differences, etc. problem, to achieve the effect of easy implementation, improved binding force and improved performance

Inactive Publication Date: 2016-12-28
GOERTEK INC
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  • Abstract
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  • Application Information

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Problems solved by technology

Due to the large material difference between the metal insert and the plastic part, the bonding force is low, and the plastic part shrinks after the two injection molds are cooled, and the contact part of the plastic part and the metal insert is easily separated from the metal insert, so that the metal insert Form gaps with plastic parts, these gaps will deteriorate the waterproof performance and sealing performance of the speaker module
[0005] Moreover, in order to improve the bonding force between the metal insert and the plastic part and avoid forming a gap b

Method used

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  • Sound generating device and preparation method of metal plastic part
  • Sound generating device and preparation method of metal plastic part
  • Sound generating device and preparation method of metal plastic part

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preparation example Construction

[0067] The invention also provides a method for preparing metal-plastic parts, such as Figure 8 shown, including the following steps:

[0068] Step (1): Oxidize the surface of the pretreated metal insert to obtain a metal insert with an oxide film layer, and the surface of the oxide film layer has nano-pre-holes with a pore size less than 10nm. The material of the metal insert can be It is a metal material commonly used in this field, such as aluminum or aluminum alloy or steel or stainless steel, etc., preferably aluminum or aluminum alloy; the above-mentioned pretreatment refers to the process of removing impurities such as foreign matter, oil stains and natural oxide layers on the surface of the metal material , the pretreatment in the present invention can be the pretreatment procedure commonly used by those skilled in the art on the surface of metal materials, generally including mechanical grinding or grinding to remove obvious foreign matter on the surface, and then de...

Embodiment 1

[0082]Put the pretreated aluminum metal insert as the anode in the electrolyte solution of sulfuric acid with a mass fraction of 10%-20%, and electrolyze it for 50 minutes at a temperature of 15°C-25°C and a voltage of 20V-80V to obtain a pore size smaller than 10nm nano pre-holes and metal inserts with a thickness of 5 μm-30 μm oxide layer; the metal inserts with nano-pre-holes are soaked in ammonium bicarbonate solution with a mass fraction of 13%-20% for 120min to obtain a pore size of 20nm-1000nm, metal inserts with nanopores with a depth of 1μm-8μm; place the metal inserts with nanopores in the mold, and then inject the resin compound into the mold to combine with the metal inserts to obtain metal-plastic parts .

[0083] Figure 9 It is the SEM image of the surface of the metal insert that has not been oxidized in Example 1, Figure 10 It is the SEM picture of the metal insert surface after oxidation treatment in embodiment 1, Figure 11 It is the SEM image of the sur...

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Abstract

The invention provides a sound generating device and a preparation method of a metal plastic part. The sound generating device comprises the metal plastic part; the metal plastic part comprises a plastic part body and a metal insert combined with the plastic part body; the surface of the metal insert is provided with an oxidation film layer obtained through metal nanometer treatment and nano-holes located on the surface of the oxidation film layer, and the hole diameter of the nano-holes ranges from 20 nm to 1,000 nm; the nano-holes are filled with a resin composition for preparing the plastic part body. According to the sound generating device and the preparation method of the metal plastic part, the nano-holes are filled with the resin composition from which the plastic part body is prepared, therefore, the purpose that the metal insert and the plastic part body are closely attached to each other is achieved, the adhesive grasping capability of the metal inset is greatly enhanced, and the condition that the metal insert and the plastic part body are separated from each other after being subjected to injection molding is prevented; the length that the metal insert is embedded into the plastic part body is greatly decreased, therefore, ultrasonic energy is smoothly transmitted, the ultrasonic non-melting problem of the metal plastic part is effectively prevented, then the waterproofness and the sealing property of the metal plastic part are improved, and the properties of the sound generating device are improved.

Description

technical field [0001] The invention relates to the field of acoustic products, more specifically, to a sound generating device and a method for preparing metal and plastic parts. Background technique [0002] With the advancement of science and technology, mobile phones, computers, TVs and other electronic products have higher and higher requirements for waterproof and sealing performance. How to improve the waterproof and sealing performance of electronic products has become a very important part of electronic product design. [0003] Taking the loudspeaker, which is commonly used in electronic products, as an example, the common loudspeakers at present mainly include dynamic loudspeakers, electromagnetic loudspeakers, capacitive loudspeakers, piezoelectric loudspeakers, etc. The dynamic loudspeakers are relatively simple to manufacture, Low cost, good low-frequency sound advantages and so on. The existing dynamic speaker is also called a dynamic speaker module, which usu...

Claims

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Application Information

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IPC IPC(8): H04R31/00B29C45/14
CPCB29C45/14H04R31/00H04R2231/003B29C45/14311B29C2045/14868B29K2705/02B29L2031/38C25D11/24C25D11/34H04R9/025H04R9/06H04R2201/029H04R2307/027H04R2400/11B29K2705/12C25D11/02C25D11/04
Inventor 张庆一陈钢李振军范双双
Owner GOERTEK INC
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