Isothermal forging die and forging technology thereof of magnesium alloy die forge piece of step type structure

Abstract

The invention discloses an isothermal forging die and a forging technology thereof of a magnesium alloy die forge piece of step type structure. An upper die (3) and a lower die (4) are both of semi-closed structures, and in other words, the upper die (3) and the lower die (4) are both of open structures along the length direction, and of closed structures along the width direction due to flash gutters designed on the width direction of the upper die (3) and the lower die (4). One side face along the width direction of the upper die (3) and one side face along the width direction of the lower die (4) are vertical to each other, and the upper die (3) is in clearance fit with the lower die (4) on the position where the upper die (3) and the lower die (4) vertically intersect so as to form a closed cavity. The isothermal forging die and the forging technology thereof of the magnesium alloy die forge piece of step type structure can effectively reduce forging deformation resistance, enable a forging stock to obtain good plasticity, and are high in isothermal forging production efficiency.

Description

technical field [0001] The invention relates to a magnesium alloy forging die, in particular to an isothermal forging die for a magnesium alloy stepped structure die forging, and also relates to a forging process using the isothermal forging die for a magnesium alloy step structure die forging. Background technique [0002] Magnesium alloy is the lightest metal structure material at present, with the advantages of low density, high specific strength and specific stiffness, good damping and shock absorption, good electromagnetic shielding effect, excellent machining performance, stable parts size, and easy recycling. Aerospace, national defense and military industries have broad application prospects. At present, most magnesium alloy products are castings, especially die castings. Due to the fast solidification speed and wide crystallization temperature range of liquid magnesium alloys, defects such as pores, shrinkage porosity, and condensation are prone to occur during cas...

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Problems solved by technology

[0003] The crystal structure of magnesium alloy is hexagonal close-packed, and there are only three slip systems in magnesium alloy at room temperature, which leads to brittle cracks in magnesium alloy during plastic deformation at room temperature, and it is difficult to process plastic deformation. The emergence of {1011} and slip systems increases the plasticity of magnesium alloys at high temperatures and makes plastic forming possible. However, the heating temperature of magnesium alloys is too high or the holding time is too long, which will lead to grain coarsening. Causes the alloy to soften, resulting in a decrease in mechanical properties, so the forging temperature must be strictly controlled during the forging process

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