Small-scale magnesium alloy bar pipe hot extrusion shaping mold

Abstract

The invention relates to a small-scale magnesium alloy bar pipe hot extrusion shaping mold, including an upper and a lower die holders, a squeezing barrel, a male die, a concave die and the like, wherein, the squeezing barrel adopts a two-layer pre-stress composite structure opened with thermometer holes, a thermal insulation sleeve is provided outside the barrel, the concave die is fixed on the lower die holder by the conjunction of a squeezing barrel, the squeezing barrel, the thermal insulation sleeve and the concave die are fastened by the upper and lower die holders; the male die directly contacts the inner wall of the squeezing barrel in transition conjunction, the upper end of the pressing stem is provided with a spacing press head to ensure that the male die is not directly pressed on the concave die. The invention can produce a variety of specifications for small-size magnesium alloy rod pipes by a simple die change, which has features of high material utilization, uniform blank deformation, small extruding force, high products dimensional precision and surface accuracy. The invention also advantages of simple mold structure, easy operation, low cost, long life and so on.

Description

technical field [0001] The invention relates to magnesium alloy hot extrusion forming technology, in particular to a small-sized magnesium alloy rod tube hot extrusion forming die, which is used in the field of magnesium alloy hot extrusion processing. Background technique [0002] Magnesium alloy has a series of advantages such as high specific strength and specific stiffness, good damping and vibration reduction, strong electromagnetic shielding and radiation resistance, easy cutting and processing, and easy recycling. It is used in automobiles, electronics, electrical appliances, transportation, aerospace, aviation and national defense military Industry and other fields have important application value and broad application prospects. However, magnesium alloys have few slip systems at room temperature and are difficult to plastically deform. Most of the products are obtained by casting, which has disadvantages such as coarse grains, poor mechanical properties, and prone t...

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Problems solved by technology

Usually, the hot extrusion of magnesium alloy seamless pipe or rod is carried out on a horizontal extrusion machine with or without a perforation device, which requires large extrusion equipment and temperature control devices. The mold size is large, the structure is complex, and there are many forming processes. , high production cost

For the extrusion of small-sized magnesium alloy rods and tubes with a diameter of less than 10mm, there are still problems such as large extrusion force, low production efficiency, and large wall thickness difference of the pipe. The existing horizontal extrusion machine cannot be well adapted to small-sized magnesium alloy rods. The production of alloy rods and tubes, especially the production of high-precision magnesium alloy thin-walled thin tubes

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