A double-carriage pipe bending machine and its bending method

Abstract

The invention relates to a double-cart type pipe-bending machine and a bending method. The double-cart type pipe-bending machine comprises rails, a main tackle assembly, an auxiliary tackle assembly and a power system. Both the main tackle assembly and the auxiliary tackle assembly are respectively provided with a clamping device used for clamping pipes, and the main tackle assembly and the auxiliary tackle assembly are controlled by the power system to move on the corresponding rails to adjust clamping positions of the pipes. The clamping device on the auxiliary tackle assembly is fixedly clamped, the bottom of the clamping device on the main tackle assembly is provided with a bending power assembly, and the bending power assembly is controlled by the power system to drive the clamping device on the main tackle assembly to rotate to bend the pipes. According to the bending method, the same bending moment is applied to pipe sections between the clamping devices at the same time to enable the pipe sections to bend and deform at the same time, bending and deformation of the pipes drive the two tackle assemblies to coordinately move on the rails until the needed bent pipes are formed. The double-cart type pipe-bending machine is compact in structure and good in bent pipe forming quality and can be suitable for bending different pipes.

Description

technical field [0001] The invention relates to the production of bent pipes, in particular to a double-vehicle pipe bending machine and a bending method suitable for bending large-caliber thick-walled pipes. Background technique [0002] my country's high-pressure seamless steel pipe forming technology includes intermediate frequency benders and simmer benders in hot bending, and pure push benders, pure pull benders, and push-pull benders in cold bends. The intermediate frequency pipe bending machine does not need a pipe bending mold, and the bending radius can be adjusted arbitrarily, but its bending speed is slow, the efficiency is low, the heating energy consumption is large, and high temperature heating is easy to cause surface oxidation and crystal phase structure changes of materials. Simmering requires a pipe-shaped mold, high energy consumption, and no straight line at the elbow. Cold pipe bending machines all need pipe bending dies. Different steel pipe outer diam...

AI Technical Summary

Problems solved by technology

The intermediate frequency pipe bending machine does not need a pipe bending mold, and the bending radius can be adjusted arbitrarily, but its bending speed is slow, the efficiency is low, the heating energy consumption is large, and high temperature heating is easy to cause surface oxidation and crystal phase structure changes of materials

Simmering requires a pipe-shaped mold, high energy consumption, and no straight section of the elbow

Cold pipe bending machines all need pipe bending dies. Different steel pipe outer diameters and different bending radii require different pipe bending dies. The cost of mold manufacturing is high, especially for pipe bending dies with large diameters and large bending radii. Their weight up to dozens of tons

It takes a long time to demould the pure push cold bender, and it cannot bend U-shaped bends and three-dimensional continuous bends

The push-pull cold bending machine occupies a large area, the foundation cost is high, the foundation needs to bear considerable working force, the equipment is huge, and the replacement of the mold is time-consuming and laborious, which reduces the work efficiency

In addition, the traditional cold and hot pipe bending machines carry out the plastic deformation of the pipe point by point sequentially, and the deformation time per unit length is short, although the entire pipe bending time is long

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