Mild hot formation method for making magnesium alloy shell of cell phone and mould specially for the same

Abstract

A thermal shaping method for the Mg-alloy shell of mobile telephone features use of draw technology with a dedicated die set, which includes such steps as heating edge pressing ring and female die to 170-180 deg.C, coating lubricant onto die set and raw black of said Mg-alloy shell, heating the raw black, pre-heating the male die to 70-100 deg.C, and die pressing at 170-180 deg.C for drawing.

Description

technical field [0001] The invention relates to an alloy plate stamping forming technology, in particular to a warm forming method for a magnesium alloy mobile phone casing and a special mold thereof, which are mainly used in the forming of a magnesium alloy plate through a warm drawing process. Background technique [0002] Metal magnesium and its alloys are the lightest structural metal materials used in engineering so far. Magnesium alloys characterized by light weight, good rigidity, good metallic luster, good electromagnetic shielding and easy recycling have become modern automobiles, electronics, The preferred material for communication and other industries. At present, magnesium alloy products are obtained by casting methods. The disadvantages are low yield, more holes and looseness, low strength, and poor ductility, which cannot meet the higher requirements of the product. Due to the process requirements, the wall thickness of the casting itself cannot be too thin, w...

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Problems solved by technology

Mainly due to the close-packed hexagonal crystal structure of metal magnesium, the plastic formability of most magnesium alloys at room temperature is very poor. Raising the forming temperature will effectively improve its formability, usually in the temperature range of 250-400°C Processing and forming will bring the disadvantages of relatively complex mold system, and the cost of the product is also relatively expensive, and when the heating time is too long, it is easy to cause coarse grains inside the plate, which will seriously reduce the plastic deformation ability of the plate. At this time, the blank is very brittle, and it is very easy to crack at the rounded corner of the punch during deep drawing

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