ALUMINUM-PLASTIC COMPOSITE STRUCTURE
An aluminum-plastic composite structure includes an aluminum portion and a plastic portion. The aluminum portion defines a plurality of micro grooves by ultraviolet lithography. The plastic portion is integrally formed on the aluminum portion and substantially filling in the micro grooves. A width of each micro groove is in a range from 0.02 millimeters to 0.05 millimeters. A depth of each micro groove is in a range from 0.2 millimeters to 0.25 millimeters.
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The present application is a divisional application of U.S. patent application Ser. No. 13/074,134, filed on Mar. 29, 2011.
BACKGROUND1. Technical Field
The present disclosure relates generally to an aluminum-plastic composite structure.
2. Description of Related Art
Many aluminum-plastic composite structures used in electronic devices include a metal member and a plastic member fixed on the metal member. The plastic member is adhered on the metal member by glue. However, strength of the bond formed using the glue will decrease over time, and may result in detachment of the metal member from the plastic member.
Therefore, there is room for improvement within the art.
The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the views.
Referring to
Also referring to
In step 201, an aluminum portion 21 is provided, and the aluminum portion 21 includes a joining surface 210;
In step 202, a plurality of micro grooves 211 are formed in the joining surface 210 by ultraviolet lithography, a width of each micro groove is in a range from about 0.02 mm to about 0.05 mm; a depth of each micro groove is in a range from 0.2 mm to 0.25 mm. The process of ultraviolet lithography for defining the micro grooves 211 includes the following steps:
(1) Photoresist is covered on the joining surface 210 of the aluminum portion 21.
(2) An optical mask is formed on the joining surface 210 of the aluminum portion 21, and the aluminum portion 21 is placed in an ultraviolet exposure machine for UV exposure.
(3) The aluminum portion 21 is etched in an etching fluid in a cavity to form the micro grooves 211, in which a size of the micro groove is being controlled by adjusting the concentration of the etching fluid and/or an etching duration.
In step 203, the aluminum portion 21 is positioned in a mold, and then the melt plastic material is injected on the aluminum portion 21 to form a plastic portion 23. The plastic material is injected and substantially filling into the micro grooves 211, thus the plastic portion 23 can be bonded or fixed on the joining surface 210 of the aluminum portion 21.
In step 204, the plastic portion 23 is cooled to form the aluminum-plastic composite structure 200.
The aluminum-plastic composite structure 200 defines the micro grooves 211 at the joining surface 210 of the aluminum portion 21 in which the plastic material is embedded, thus firmly fixing or bonding the plastic portion 23 on the aluminum portion 21, and increasing the bond strength between the aluminum portion 21 and the plastic portion 23.
The aluminum-plastic composite structure 200 also has a reduced thickness because no latching mechanism is included.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages.
Claims
1. An aluminum-plastic composite structure comprising;
- an aluminum portion, the aluminum portion defining a plurality of micro grooves by ultraviolet lithography;
- a plastic portion, the plastic portion integrally formed on the aluminum portion and substantially filling in the micro grooves; wherein a width of each micro groove is in a range from about 0.02 to about 0.05 millimeters, and a depth of each micro groove is in a range from about 0.2 millimeters to about 0.25 millimeters.
2. The aluminum-plastic composite structure of claim 1, wherein a ratio of the depth to the width is equal to or greater than about 10.
3. The aluminum-plastic composite structure of claim 1, wherein the aluminum portion is a sheet, the depth of each micro groove is equal to or less than about 80% of the thickness of the aluminum portion where the micro groove are defined.
Type: Application
Filed: Mar 29, 2013
Publication Date: Aug 29, 2013
Applicant: HON HAI PRECISION INDUSTRY CO., LTD. (New Taipei)
Inventor: HON HAI PRECISION INDUSTRY CO., LTD.
Application Number: 13/853,071
International Classification: B32B 3/30 (20060101); B32B 15/08 (20060101);