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In-mold injection molding process of aluminum casing

A technology of in-mold injection molding and forming technology, which is applied in the direction of coating, etc., can solve the problems of easy separation, difficult joining, and difficult CNC processing, etc., and achieve the effect of simple process, firm combination and difficult separation

Active Publication Date: 2015-08-12
DONGGUAN SINCO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the great difference in the physical properties of metal and plastic, it is difficult to join commonly used engineering plastics directly to the surface of metal aluminum. It is usually designed as a mosaic structure to increase the joint firmness of the two materials, but it is difficult for small and precise parts. Design the processing technology of mosaic structure, CNC processing is difficult
[0003] In the existing technology, the injection molding process of the mosaic structure is prone to the problem of weak bonding and easy separation, and the requirement of high-strength bonding between the metal and the engineering plastic plane to the plane cannot be realized

Method used

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  • In-mold injection molding process of aluminum casing
  • In-mold injection molding process of aluminum casing
  • In-mold injection molding process of aluminum casing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The in-mold injection molding process of the aluminum casing of the present embodiment comprises the following steps:

[0049] The first step, cleaning the aluminum case:

[0050] Clean the surface of the aluminum casing;

[0051] In the second step, the surface of the aluminum casing is treated with nano-scale microporous surface:

[0052] Step 1, fix the aluminum casing with a clean surface on the rack with electrodes;

[0053] Step 2, use the hanger to put the aluminum casing into the Fe(OH) 3 In the colloidal solution, electrify and carry out electrolytic treatment for 20 seconds; wherein, Fe(OH) 3 The colloidal solution is obtained by adding FeCl 3 Fe(OH) generated by reaction with hot water in a heating tank 3 Colloid saturated solution.

[0054] Step 3, put the aluminum casing after the electrolytic treatment in step 2 into a NaOH solution with a concentration of 4% and soak for 30 seconds;

[0055] Step 4, take the aluminum casing out of the NaOH solutio...

Embodiment 2

[0064] The in-mold injection molding process of the aluminum casing of the present embodiment comprises the following steps:

[0065] The first step, cleaning the aluminum case:

[0066] Clean the surface of the aluminum casing;

[0067] In the second step, the surface of the aluminum casing is treated with nano-scale microporous surface:

[0068] Step 1, fix the aluminum casing with a clean surface on the rack with electrodes;

[0069] Step 2, use the hanger to put the aluminum casing into the Fe(OH) 3 In the colloidal solution, energize and carry out electrolytic treatment for 30 seconds; wherein, Fe(OH) 3 The colloidal solution is obtained by adding FeCl 3 Fe(OH) generated by reaction with hot water in a heating tank 3 Colloid saturated solution.

[0070] Step 3, put the aluminum casing after the electrolytic treatment in step 2 into an 8% NaOH solution and soak for 20 seconds;

[0071] Step 4, take the aluminum casing out of the NaOH solution and put it in 10% NH ...

Embodiment 3

[0080] The in-mold injection molding process of the aluminum casing of the present embodiment comprises the following steps:

[0081] The first step, cleaning the aluminum case:

[0082] Clean the surface of the aluminum casing;

[0083] In the second step, the surface of the aluminum casing is treated with nano-scale microporous surface:

[0084] Step 1, fix the aluminum casing with a clean surface on the rack with electrodes;

[0085] Step 2, use the hanger to put the aluminum casing into the Fe(OH) 3 In the colloidal solution, electrify and carry out electrolytic treatment for 10 seconds; wherein, Fe(OH) 3 The colloidal solution is obtained by adding FeCl 3 Fe(OH) generated by reaction with hot water in a heating tank 3 Colloid saturated solution.

[0086] Step 3, put the aluminum casing after the electrolytic treatment in step 2 into a NaOH solution with a concentration of 2% and soak for 40 seconds;

[0087] Step 4, take the aluminum casing out of the NaOH solutio...

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Abstract

The present invention relates to the technical field of injection molding of mobile phone casings, in particular to the in-mold injection molding process of aluminum casings, which includes the following steps: the first step is to clean the aluminum casing; Hole surface treatment: step 1, fix the aluminum casing on the hanger with electrodes; step 2, use the hanger to put the aluminum casing into the Fe(OH)3 colloid solution and energize it for a certain period of time; step 3, Soak the aluminum case in NaOH solution for a certain period of time; step 4, put the aluminum case in NH4CL solution for a certain period of time; step 5, put the aluminum case in pure water for several times; step 6 , drying the aluminum casing, that is, completing the nano-scale microporous surface treatment on the surface of the aluminum casing; the third step is injection molding. The forming process makes the combination between the aluminum casing and the plastic firm and difficult to separate, and can realize the plane-to-plane bonding requirement between the aluminum casing and the plastic.

Description

technical field [0001] The invention relates to the technical field of injection molding of mobile phone casings, in particular to an in-mold injection molding process for aluminum casings. Background technique [0002] At present, most of the internal brackets of mobile phones are made of metal aluminum, and the internal brackets of the mobile phone case frame need to be injection molded to meet the structural and appearance requirements. In the prior art, the injection molding process for the inner bracket of the mobile phone case frame is as follows: first, the aluminum case frame is processed by CNC, and then the insulating plastic structure is directly injected on the bracket. However, due to the great difference in the physical properties of metal and plastic, it is difficult to join commonly used engineering plastics directly to the surface of metal aluminum. It is usually designed as a mosaic structure to increase the joint firmness of the two materials, but it is di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/14B29C45/78B29C45/77C25F3/04
CPCB29C45/14B29C45/1753B29C45/77B29C45/78B29C2945/76498B29C2945/76531C25F3/04
Inventor 高辉云
Owner DONGGUAN SINCO ELECTRONICS