Nuclear reactor integrating lower end socket integrity profiling and forging method

Abstract

The invention discloses a nuclear reactor integrating lower end socket integrity profiling and forging method and belongs to the technical field of forging forming. The nuclear reactor integrating lower end socket integrity profiling and forging method comprises steps of step one determining the external diameter and the internal diameter of an opening end of the end socket to be the end socket outer ball top total height and the internal semi-circle spherical radius according to a requirement of a drawing of the to-be-machined end socket; step two producing a special hammer for rotary swaging; step three producing an upper die, a lower die and a lower die base pad of a die; step four installing the lower die on a workbench of a hydraulic press before forging and performing upsetting on blanks through a hydraulic press flexible cross beam press upper flat plate; step five sequentially installing the lower die base pad, the lower die, the upper die and the special hammer on the hydraulic press workbench, placing the lower die base pad at a lowest position of the workbench, then placing the lower die and the upper die and measuring the blank size after rotary forging and producing an integrating lower end socket product after the blank size is qualified, wherein the upper die is above the lower die, the hydraulic press flexible cross beam is connected with the special hammer, and all dies are guaranteed centering.

Description

technical field [0001] The invention relates to an overall profiling forging method for an integrated lower head of a nuclear reactor, in particular to an integrated forging forming method for an ultra-large thick-walled head with an asymmetrical and non-contour height connecting pipe, and belongs to the technical field of forging. Background technique [0002] In order to reduce the workload of welding seams and in-service inspections and improve the service life of equipment, the nuclear power heads adopt an integral design structure, that is, the head and the connecting pipe no longer use a welded structure, but are directly designed as an integrated structure. Due to the asymmetric positions of the multiple nozzles on the outer surface of the integrated lower head, the orientation of the nozzles is different, and the heights are not equal, so the forging of this kind of head mostly adopts the covering free forging process, that is, the radius of the outer ball of the head...

AI Technical Summary

Problems solved by technology

Although the free forging forming method is simple, the material utilization rate is low, the manufacturing cycle is long, the fiber streamline at the joint is not continuous, the deformation of the forging is uneven and insufficient, the internal quality of the product is poor, and the homogeneity is poor

Using tire die forging can directly form each connecting pipe, which overcomes many shortcomings of free forging above. However, because the overall size and wall thickness of the integrated lower head forging are large, and the forging weighs nearly 200 tons, the forming force required for tire die forging is also low. Very big

It has been calculated that a 100,000-ton large-scale press is required to form the above-mentioned integrated lower head forging by tire die forging, and there is no such large-scale press in the world at present.

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