In-mould injection moulding process of aluminum shell

An in-mold injection molding and molding technology, applied in the coating and other directions, can solve the problems of easy separation, difficult joining, and difficult CNC processing, and achieve the effect of firm bonding, simple process, and difficult separation.

Active Publication Date: 2015-03-25
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-mould injection moulding process of aluminum shell
  • In-mould injection moulding process of aluminum shell
  • In-mould injection moulding process of aluminum shell

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 solu...

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% N...

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 solu...

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Abstract

The invention relates to the technical field of injection moulding of mobile phone shells, in particular to an in-mould injection moulding process of an aluminum shell. The in-mould injection moulding process comprises the following steps: 1, cleaning the aluminum shell; 2, performing nanoscale microporous surface treatment on the surface of the aluminum shell: 1), fixing the aluminum shell on a hanger with electrodes; 2), putting the aluminum shell into an Fe(OH)3 colloidal solution by using the hanger, and electrifying the aluminum shell for a certain period of time; 3), putting the aluminum shell into a NaOH solution, and soaking for a certain period of time; 4), putting the aluminum shell into an NH4CL solution, and cleaning for a certain period of time; 5), putting the aluminum shell into purified water, and cleaning for many times; 6), drying the aluminum shell to finish the nanoscale microporous surface treatment to the surface of the aluminum shell; 3, performing injection moulding. By the in-mould injection moulding process, the aluminum shell and plastic are firmly combined and are unlikely to separate, and a requirement on plane-to-plane combination of the aluminum shell and the plastic can be met.

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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IPC IPC(8): B29C45/14B29C45/78B29C45/77C25F3/04
CPCB29C45/14B29C45/1753B29C45/77B29C45/78B29C2945/76498B29C2945/76531C25F3/04
Inventor 李文联
Owner DONGGUAN SINCO ELECTRONICS
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