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A kind of preparation method of workpiece

A technology of prefabricated parts and composite parts, which is applied in the direction of chemical instruments and methods, digital data processing parts, instruments, etc., can solve problems such as prone to waste products, unfavorable spraying, and inability to achieve appearance effects, so as to achieve good use effects and realize software tactile effect, effect of improving appearance quality

Active Publication Date: 2016-03-02
LENOVO (BEIJING) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned method can prepare a notebook casing with good appearance quality, it also has the following disadvantages: first, because the plastic part generally selects a material with a low thermal expansion coefficient, such as PPS, LCP, PA and PPA, etc. Due to the low polarity, it is not conducive to spraying and is prone to waste products; secondly, because the expansion coefficients of the plastic part and the metal part are inconsistent, it is very easy to cause warping due to uneven expansion during the painting process, and it is also prone to waste products In addition, the workpiece prepared by this technology can only be treated with spray paint on the surface. Due to the limitation of the spray paint itself, the appearance of the finished product is slightly monotonous, and it cannot achieve the common appearance effects of notebook computers such as high gloss and pearlescent, nor can it directly achieve such as anodic oxidation or The effect of etching and other technical processes
Therefore, due to the limitations of the above-mentioned disadvantages, the yield rate of finished products prepared by the method in the prior art is low, and the cost is relatively expensive

Method used

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  • A kind of preparation method of workpiece
  • A kind of preparation method of workpiece
  • A kind of preparation method of workpiece

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preparation example Construction

[0046] An embodiment of the present invention provides a method for preparing a workpiece, which is characterized in that it includes:

[0047] a) Provide metal / plastic composite parts;

[0048] b) preparing a polyurethane layer on the surface of the metal / plastic composite to obtain a workpiece.

[0049] According to an embodiment of the present invention, the metal / plastic composite part is formed by compounding a metal part and a plastic part, a typical metal composite part such as a cover of a notebook, but not limited thereto. The material of the metal parts is preferably magnesium-aluminum alloy, which has low density and high strength, so while ensuring that the notebook is light and thin, it is also guaranteed to have good strength. In order to prevent the magnesium-aluminum alloy from shielding the antenna signal in the notebook, the part corresponding to the antenna is combined with a plastic part and a metal part. Specific examples of the material of the plastic pa...

Embodiment 1

[0070] Plastic raw material composition: Japan Sumitomo E4008;

[0071] Polyurethane raw material composition: DuPont IMRON2.8HGTM, divided into A component and B component, wherein A component is isocyanate, B component is polyol and catalyst.

[0072] The operation steps are as follows:

[0073] The metal preform 11 made of magnesium-aluminum alloy is obtained by die-casting, and then the position 11a of the antenna cover is processed on the metal preform, such as figure 2 Shown is the front view of the metal prefabricated part; image 3 for figure 2 In the cross-sectional view of the workpiece along A-A, the upper end surface 11b of the metal part 11 is used to contact the plastic part;

[0074] See Figure 4 , is a schematic diagram of the molding die 21 used in the method of this embodiment, and the molding die 21 includes a first cavity 21a for molding a metal / plastic composite and a second mold for molding a polyurethane layer on the surface of the composite Cave...

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Abstract

The invention provides a preparation method of a workpiece. The method comprises the following steps of providing a metal / plastic composite part, and forming a polyurethane layer on the surface of the composite part. Compared with the painting process in the prior art, the polyurethane layer provided by the invention can reach a good combination effect with the metal / plastic composite part, the combination mark of the plastic and metal part can be covered totally, and moreover, no heating is required for the composite part, thus, warping caused by uneven expansion does not occur, and continuous smooth appearance surface can be formed. In addition, the method provided by the invention can be used for conveniently changing the surface harness of the workpiece through adjusting the components of the polyurethane, realizing the soft contact effect or realizing different color effects. Or, the appearance quality of the workpiece can be improved through changing the internal surface patterns of a mold and forming patterns on the surface of the workpiece.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a method for preparing a workpiece. Background technique [0002] At present, the market has higher and higher requirements for notebook computers to be thinner, lighter and more aesthetically pleasing, so higher requirements are also put forward for the design of notebook casings. Usually, the cover on the notebook that is opposite to the display screen is called shell A, the shell where the display screen is located is called shell B, the shell where the keyboard is located is called shell C, and the bottom shell corresponding to shell C is called shell D. . [0003] Notebook A shell is a composite workpiece formed by combining metal parts and plastic parts. The material of metal parts is generally magnesium-aluminum alloy. The main characteristics of magnesium-aluminum alloy are low density and high strength, so it can be used under the condition of ensuring the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B27/06B32B27/40G06F1/16
Inventor 郝宁尤德涛
Owner LENOVO (BEIJING) LTD
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