Pipe pushing rolling device for high-performance magnesium alloy seamless pipes

Abstract

The invention provides a pipe pushing rolling device for high-performance magnesium alloy seamless pipes. The pipe pushing rolling device structurally comprises a floating supporting pressing roller device, a driven pressing roller set, a pushing device, an I-shaped guiding rail, a sliding key and a heating heat-insulation device. The floating supporting pressing roller device has the auxiliary supporting and centering effects; the driven pressing roller set rolls pipe blanks through pushing force on the pipe blanks; the pushing device is driven by a stepper motor, and after deceleration is conducted through a tapered tooth deceleration gear set, a gear rack transmission set drives a trolley to push the pipe blanks; the heating heat-insulation device conducts heat supplementing on the rolling process of the pipe blanks or preheating before rolling through joule heat generated by a heating coil; and the pushing device and the floating supporting pressing roller device are fixed to the I-shaped guiding rail through sliding blocks. The cracking and snapping phenomena in the rolling process of the pipe blanks can be significantly lowered, the structure performance of the rolled pipes is improved, the device is extremely larger in process flexibility, and the magnesium alloy pipes with different diameters and lengths can be rolled.

Description

technical field [0001] The invention relates to the field of preparation of magnesium alloy pipes, in particular to a pipe pushing and rolling device for high-performance magnesium alloy seamless pipes. technical background [0002] Magnesium alloy has a low density (1.8g / cm 3 ), high specific strength, impact resistance, shock absorption, electromagnetic shielding, thermal conductivity, good electrical conductivity and other unique advantages, it has important application value in national industry. my country is currently the world's largest producer and exporter of magnesium, with proven reserves of about 13 billion tons of magnesium, which has incomparable national strategic advantages; however, my country mainly focuses on primary magnesium smelting (smelting 1 ton of magnesium will emit 20.07 tons of CO 2 ), belongs to the raw material export-oriented industry at the cost of sacrificing resources and the environment. It can be seen that without a breakthrough in magn...

AI Technical Summary

Problems solved by technology

[0003] Existing pipe rolling devices mainly include: longitudinal rolling, periodic rolling and pipe jacking rolling, all of which have different degrees of disadvantages when rolling magnesium alloy pipes; (1) longitudinal rolling, due to axial extension deformation , so that there is a speed difference between the roller groups of different passes. As a low-plastic material, magnesium alloy is extremely sensitive to the pulling force or compressive stress caused by the speed difference, which is easy to cause cracking or outer surface wrinkles in the process of magnesium alloy pipes; (2) Periodic rolling, the forming efficiency is low, it takes a long time to roll a magnesium tube, the temperature drop at the end of the tube is serious, and the plasticity is reduced, resulting in cracking of the tube; (3) The tube jacking rolling process is very good It overcomes the problems of speed ratio and efficiency, but in the rolling process, it needs to rely on the compression force at the necking part of the necking process to pull the pipe rolling, which is time-consuming and laborious, and it is easy to break from the necking part.

And when the pipe is pushed and rolled, the metal flows in the opposite direction of the mandrel movement, which is likely to cause surface tensile stress and affect the after-beard performance of the pipe.

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