Metal-plastic composite part and method of making same, and electronic device housing having same

A method for making a composite piece comprised of a metal part and a glass-fiber-reinforced plastic part, the method comprising:

• providing a metal part comprising a main body and an unwanted portion adjoining the main body;
• defining a receiving cavity in the metal part, wherein the receiving cavity extending through the main body and extending halfway in the unwanted portion;
• defining a flow guiding channel through the unwanted portion, the flow guiding channel having an inlet communicating with the receiving cavity and an outlet, a size of the flow guiding channel being gradually decreased along a direction from the inlet to the outlet;
• introducing molten plastic reinforced with glass fibers into the receiving cavity from a surface of the main body facing away from the unwanted portion to fill the receiving cavity and the flow guiding channel, the molten plastic reinforced with glass fibers thereby overflowing from the outlet to form a flash section, wherein the glass fibers in the molten plastic which flow through the flow guiding channel are thereby oriented substantially parallel to each other;
• curing the molten plastic to obtain a plastic part comprising a cured plastic portion in the receiving cavity and the flow guiding channel, and a flash part cured from the flash section;
• removing the unwanted portion together with a portion of the cured plastic portion received in the flow guiding channel and a portion of the cured plastic portion received in part of the receiving cavity which is located within the unwanted portion, to obtain the composite piece comprising a glass-fiber-reinforced plastic part, wherein the glass-fiber-reinforced plastic part includes an exposed surface and glass fibers exposed at the exposed surface are substantially parallel to each other.