Manufacturing process of wind-power principal shaft product and its special integral forming device

Abstract

The invention relates to a manufacturing process for a wind power main shaft product and a special one-piece forming device thereof. The invention relates to a method for manufacturing a wind power main shaft product and a one-piece forming device thereof. The manufacturing process comprises the following steps: carrying out the ladle refining of molten steel, then pouring the molten steel to form an ingot, carrying out the hot delivery and heating the ingot to reach a forging temperature, upsetting and drawing out the ingot, cutting off a casting head and discarded bottom material, forging the ingot into a bench shaft-shaped blank, designing the special forming device with allowance, lifting the blank into the special forming device, integrally forming a flange, carrying out the finishing and shaping the parts of the forged piece, carrying out the heat treatment after forging, the rough machining, the semi-finishing and the finishing, and obtaining the product. The manufacturing process adopts the steps of upsetting and drawing out the ingot, and forging and forming the flange through the special one-piece forming device so as to ensure that the forging ratio at the flange part reaches above 3.0. The manufacturing process can greatly improve the flaw detection passing percent of the flange, guarantee the intrinsic quality of the product, and have few forging times, low cost and few work hours. 1,000 wind power main shafts between 0.70 and 1.50MW are manufactured by the invention. The long-period practice verifies that the manufactured wind power main shafts have reliable intrinsic quality and stable outline quality.

Description

technical field [0001] The invention relates to a method for manufacturing wind power main shaft products and an integral forming device. Background technique [0002] At present, the domestic and international wind power generation markets are huge, and one of the most critical components in wind power generators - the wind power main shaft, is in short supply. The product is characterized by large flange, small shaft diameter, difficult molding, and high technical requirements. Due to the large flange and small diameter of the shaft body, the rough flange and the shaft body are prone to eccentricity, which often results in insufficient machining allowance and scrapping of the product. In order to meet the processing needs, it is necessary to increase the forging allowance of the flange, and accumulate a large amount of process auxiliary materials at the transition part between the flange and the shaft body, so that the utilization rate of the material is low, which not on...

AI Technical Summary

Problems solved by technology

Due to the large flange and small diameter of the shaft body, the rough flange and the shaft body are prone to eccentricity, often resulting in insufficient machining allowance and scrapping of the product

In order to meet the processing needs, it is necessary to increase the forging allowance of the flange, and accumulate a large amount of process auxiliary materials at the transition part between the flange and the shaft body, so that the utilization rate of the material is low, which not only wastes raw materials, but also seriously affects the machining efficiency

[0003] Now it is generally produced by two-upsetting and two-drawing process, which not only has many forging fires, but also the internal quality cannot be guaranteed, the pass rate of flaw detection is low, and at the same time, it is a serious waste of raw materials and increases the cost of machining.

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