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Secondary-pressure-casting metal product with appearance defect overcome, preparation method thereof, middle frame of mobile phone and mobile phone

A technology for appearance defects and the middle frame of mobile phones, which is applied to the structure of telephones, etc.

Inactive Publication Date: 2020-03-10
HUIZHOU BYD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the existing technology cannot effectively improve the appearance defects on the surface of amorphous alloys with a diameter of more than 0.2 mm. On the one hand, it provides a method for improving the appearance defects of die-casting metal products. The method Including: under vacuum conditions, injecting molten metal onto the surface of the die-cast metal product with appearance defects to perform secondary die-casting and form a secondary die-casting layer formed on the surface of the die-casting metal product with appearance defects The surface of the die-casting metal product and the defect, and then hold the pressure under the injection pressure; after the holding pressure is over, take the thickness of the secondary die-casting layer formed on the surface of the die-casting metal product with appearance defects as a benchmark, and divide the The above-mentioned secondary die-casting layer is completely removed to obtain a secondary die-casting metal product with improved appearance defects;

Method used

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  • Secondary-pressure-casting metal product with appearance defect overcome, preparation method thereof, middle frame of mobile phone and mobile phone
  • Secondary-pressure-casting metal product with appearance defect overcome, preparation method thereof, middle frame of mobile phone and mobile phone
  • Secondary-pressure-casting metal product with appearance defect overcome, preparation method thereof, middle frame of mobile phone and mobile phone

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Embodiment 1

[0049] This embodiment is used to illustrate the method for improving the appearance defects of die-cast metal products provided by the present invention

[0050] (1) Zirconium-based amorphous alloy substrates with diameters of trachoma defects to be improved are 0.1±0.01mm, 0.2±0.01mm, 0.3±0.01mm, 0.4±0.01mm, 0.5±0.01mm (the schematic diagram is shown in Figure 1, Profile as figure 2 As shown, among them, 1 is the defect type depression, 2 is the interface of the die-casting metal product, and 3 is the appearance surface of the die-casting metal product) marked as a, b, c, d, e, respectively placed in 5% by weight of sodium hydroxide solution Wash and remove oil, and then wash with deionized water to remove residual sodium hydroxide.

[0051] (2) Dry the substrate cleaned in step (1) and preheat it to 250°C, then fix it in the cavity of the secondary die-casting mold at 300°C through the positioning hole (80°C higher than the primary die-casting mold), and close the mold F...

Embodiment 2

[0055] This embodiment is used to illustrate the method for improving the appearance defects of die-cast metal products provided by the present invention

[0056] (1) Mark the copper-based amorphous alloy substrates with diameters of 0.1±0.01mm, 0.2±0.01mm, 0.3±0.01mm, 0.4±0.01mm, and 0.5±0.01mm to be improved as a, b, c, d, e, respectively placed in 3% by weight sodium hydroxide solution for cleaning and degreasing, and then washed with deionized water to remove residual sodium hydroxide.

[0057] (2) Dry the substrate cleaned in step (1) and preheat it to 150°C, then fix it in the cavity of the secondary die-casting mold at 230°C through the positioning hole (30°C higher than the primary die-casting mold), and close the mold Finally, the system is evacuated to a vacuum degree of 100 Pa and maintained at this vacuum degree, and the vacuum leak rate of the secondary die-casting mold is 10 Pa / s.

[0058] (3) Heating the same copper-based amorphous alloy to a temperature 100°C ...

Embodiment 3

[0061] This embodiment is used to illustrate the method for improving the appearance defects of die-cast metal products provided by the present invention

[0062] (1) The iron-based amorphous alloy substrates whose appearance diameters are 0.1±0.01mm, 0.2±0.01mm, 0.3±0.01mm, 0.4±0.01mm, 0.5±0.01mm are marked as a, b, c, d, e, respectively placed in 8% by weight sodium hydroxide solution for cleaning and degreasing, and then washed with deionized water to remove residual sodium hydroxide.

[0063] (2) Dry the substrate cleaned in step (1) and preheat it to 200°C, then fix it in the cavity of the secondary die-casting mold at 250°C through the positioning hole (50°C higher than the primary die-casting mold), and close the mold Finally, the system is evacuated to a vacuum degree of 200 Pa and maintained at this vacuum degree, and the vacuum leak rate of the secondary die-casting mold is 10 Pa / s.

[0064] (3) Heat the same iron-based amorphous alloy to a temperature higher than t...

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Abstract

The invention relates to the field of amorphous alloy pressure-casting formation and discloses a secondary-pressure-casting metal product with the appearance defect overcome, a preparation method thereof, a middle frame of a mobile phone and the mobile phone. The method comprises the steps that molten-state metal is subjected to pressure jetting to the surface of the pressure-casting metal with the appearance defect, so that the pressure-casting metal is subjected to secondary pressure casting to form a secondary-pressure-casting layer, the secondary-pressure-casting layer is formed on the surface and defect portion of the pressure-casting metal product with the appearance defect, and then pressure maintaining is performed at the pressure of pressure jetting; and after pressure maintainingis ended, with the thickness of the secondary-pressure-casting layer formed on the surface of the pressure-casting metal product with the appearance defect as reference, the secondary-pressure-casting layer is completely removed to obtain the secondary-pressure-casting metal product with the appearance defect. The selected molten-state metal is identical to metal selected by the secondary-pressure-casting metal product with the appearance defect. According to the method, the defect with large diameter can be effectively overcome, the surface of the improved secondary-pressure-casting productis even in color and luster, and filler on the defect portion is firmly bonded.

Description

technical field [0001] The invention relates to the field of improving appearance defects of die-casting products, in particular to a secondary die-casting metal product with improved appearance defects and a preparation method thereof, as well as a mobile phone middle frame and a mobile phone. Background technique [0002] Since the amorphous alloy was first discovered in 1960, it has been a hot spot in the research of alloy materials. In the 1990s, the multi-element alloying method was adopted to reduce the critical cooling rate of amorphous alloys, realize the preparation of bulk amorphous alloys, and make the engineering application of such materials possible. Amorphous alloys have an atomic arrangement structure with short-range order and long-range disorder, which makes this type of material have excellent mechanical properties such as high strength, high elastic limit, and good wear resistance. [0003] Chinese invention patent application CN201310751623 (a method fo...

Claims

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Application Information

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IPC IPC(8): B22D17/00B22D19/08H04M1/02
CPCB22D17/00B22D19/08B22D19/0081H04M1/02
Inventor 陈梁唐炳忠丘加财兰石奇
Owner HUIZHOU BYD ELECTRONICS