Grinding device and grinding method for internal burrs in girth weld of steel pipe

Abstract

The invention relates to a grinding device for internal burrs in girth welds of steel pipes and a grinding method thereof. The linear moving unit is set on the car body, the lifting unit is set on the linear slide table, and the rotating drive unit is set on the lifting platform. shaft, and the high-pressure air pump is close to the lifting platform, and the high-pressure air jet disc, grinding wheel and holding unit are all located at the second end of the rotating shaft. The invention adopts pulse current to assist in grinding the inner burr at the girth weld of the steel pipe, which reduces the plastic resistance of the inner burr at the girth weld of the steel pipe, which is beneficial to prolong the service life of the grinding wheel and reduces the grinding cost. The tip of the inner burr is rapidly melted to fill the crack at the weld, and the welding quality and grinding quality of the inner burr at the girth weld of the steel pipe are improved.

Description

technical field [0001] The invention belongs to the technical field of steel pipe internal burr grinding, and in particular relates to a steel pipe internal burr grinding device and a grinding method thereof. Background technique [0002] Steel pipe is an important component in the contemporary manufacturing and transportation industries. In actual use, due to the limitation of the length of the steel pipe and the different uses of the steel pipe, it is necessary to weld multiple steel pipes so that they can meet the relevant requirements. The ring welding of root steel pipe will produce internal burrs of various shapes. Due to the different shapes and sizes of internal burrs, the grinding wheel will cause serious damage to the grinding wheel during grinding, which will greatly reduce the life of the grinding wheel; and in the welding Cracks are produced, which is not only the most common type of welding defect, but also the most destructive one. When the welded joint conta...

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Problems solved by technology

[0002] Steel pipe is an important component in the contemporary manufacturing and transportation industries. In actual use, due to the limitation of the length of the steel pipe and the different uses of the steel pipe, it is necessary to weld multiple steel pipes so that they can meet the relevant requirements. The ring welding of root steel pipe will produce internal burrs of various shapes. Due to the different shapes and sizes of internal burrs, the grinding wheel will cause serious damage to the grinding wheel during grinding, which will greatly reduce the life of the grinding wheel; and in the welding Cracks are produced, which is not only the most common type of welding defect, but also the most destructive

When the welded joint containing cracks is subjected to external loads, stress concentration will occur at the crack tip, which will seriously reduce the overall mechanical properties of the welded joint, and even cause sudden fracture. In addition, the tiny cracks in the welded joint are outside Under the action of dynamic load, it will gradually expand, and eventually lead to the failure of the joint due to fatigue fracture, which will seriously affect the operation of related projects and production activities

[0003] Grinding the internal burrs of the girth weld of the steel pipe can solve the impact of the internal burrs, but the traditional grinding method will greatly reduce the service life of the grinding wheel, the grinding efficiency is not high, the replacement frequency of the grinding wheel is high, and the grinding is completed There are cracks on the final grinding surface, resulting in insufficient stress at the weld, which cannot meet the market's large demand for high-quality welding of steel pipes

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