Large semi-ring box-like structure machining method

Abstract

The invention relates to the field of machining, in particular to a large semi-ring box-like structure machining method. The large semi-ring box-like structure machining method comprises the followingsteps that 5 mm of machining allowance is reserved on single edges of parts, meanwhile, 2 mm of shrinkage allowance is reserved, internal and external circles and square hole machining lines are marked, the distance between two square holes in a workpiece is magnified, line marking is carried out according to the technological requirement, the condition that the distance between the two square holes is influenced by welding shrinkage after corresponding components are assembled is avoided; a circle center is found out according to internal and external arcs of a large side plate, an inner arcplate is decorated with the circle center as the standard, and an outer arc plate, square steel and a semicircle inner side spot welding anti-deformation supporting rod are decorated after the outerarc of the inner arc plate accords with a line; the workpiece is clamped to a platform through a pressing plate, all parts are welded, manual arc welding is adopted for welding, the welding current is130 A-160 A, and the electric arc voltage is 26 V-28 V; side plates are decorated, air exhaust holes, connecting plates, ribbed plates and support plates are manufactured on the side plates in advance, and welding is carried out; and shape correction is carried out, stress relief annealing is carried out, and the high-temperature tempering temperature is controlled to range from 500 DEG C to 600DEG C. The large semi-ring box-like structure machining method is reasonable in technological process, the allowance distribution is even, the machining accuracy is high, and the production cost is reduced.

Description

Technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for processing a large semicircular ring box-shaped structure. Background technique [0002] Q345A is a low-alloy structural steel with good comprehensive mechanical properties, low-temperature impact toughness and good welding performance, and is widely used in the mechanical field. However, for the processing of large semi-circular ring structures, especially closed box-shaped structures, due to the large welding deformation during the welding process, the complicated welding deformation trend, and the difficulty in shaping, the processing problems have not been well solved. The solution is that the front beam of the large semicircular ring box structure is a semicircular open welded structure, which is mainly welded by the inner arc plate, the outer arc plate, the large side plate, the side plate, the connecting plates and the rib plates. The material is steel plate Q...

AI Technical Summary

Problems solved by technology

However, for the processing of large semi-circular structural parts, especially the closed box-shaped structure, due to the large amount of welding deformation during the welding process, the complicated trend of welding deformation, and the difficulty of shape correction, the processing problems have not been well resolved. Solution, the front beam of the large semi-circular box-shaped structure is a semi-circular open-shaped welded structural part, which is mainly welded by inner arc plates, outer arc plates, large side plates, side plates, connecting plates and rib plates

The materials are all steel plate Q345A, the structure size is large, the number of welds is large, the welding deformation is large, and the precision requirements are high, so the key dimensions are difficult to be guaranteed