A magnesium alloy seamless pipe diameter forging piercing rolling process

Abstract

The invention provides a new type of magnesium alloy seamless pipe diameter forging, piercing and rolling process, which belongs to the field of magnesium alloy seamless pipe preparation; it is realized through the following technical scheme: (1), homogenization treatment stage: preliminary solution to the composition of cast rods Segregation, porosity and other structural problems; (2), radial forging of magnesium alloy rods, structure modification through radial forging process, refine grains and improve the plasticity of rods; (3), temperature detection after forging, and secondary processing (4) The capillary stage of bar piercing and rolling; (5) Subsequent heat treatment and finishing process. The heat treatment process further optimizes the performance of the pipe. After the subsequent finishing process, including wall reduction, sizing, skin finishing and cleaning processes to obtain the final magnesium alloy pipe. The radial forging technology provided by the present invention can simultaneously forge the blank in two directions, constrain the deformation of the blank in the direction of widening, and improve the processing efficiency while allowing the forging to withstand three-dimensional compressive stress, which is more conducive to obtaining Superplastic ultrafine-grained magnesium alloy rods limit the expansion of cracks, improve the internal microstructure of formed forgings, forge holes in forged rods, and solve the problem of composition segregation, which is beneficial to metal plastic deformation, especially suitable for processing low plasticity metals.

Description

technical field [0001] The invention relates to the field of magnesium alloy seamless pipe preparation, in particular to a preparation process for ultrafine-grained magnesium alloy pipe diameter forging, piercing and rolling. [0002] technical background [0003] With the advancement of science and technology and the development of society, people began to realize the limited global resources and the harm brought by the increasingly serious environmental pollution to society. Therefore, people have more stringent requirements on the manufacturing fields of aerospace, automobiles, motorcycles and ships. It is required to reduce the weight of the parts used, and there are two main ways to realize the light weight of the structure: first, the mechanical properties of the materials used in the parts themselves are improved, and low-density and high-strength materials are used; Equal-strength components, for components that mainly bear bending and torsional loads, adopt a hollow ...

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Problems solved by technology

Patents CN 103801647 A and CN 102632175 A respectively provide a method for preparing magnesium alloy pipes. The radial forging process is used to directly forge the tube blank, and the process performance of the tube is optimized through plastic deformation. If the mandrel is installed in the inner cavity, the locking phenomenon of the mandrel is serious. If the distance between the mandrel and the inner cavity of the tube blank is increased, it will be difficult to realize the three-dimensional compressive stress state on the inner wall of the pipe, which will affect the process performance of the pipe.

The existing magnesium alloy hot piercing process has great advantages in forming efficiency, but the pipe yield is low

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