Wind power hollow main shaft inner hole extruding and expanding forming process

Abstract

The invention provides a wind power hollow main shaft inner hole extruding and expanding forming process, and particularly relates to the field of large wind power main shaft manufacturing, which comprises the following steps: providing a blank, heating the blank to 1220 DEG C or above, then putting the blank into a forming die, inserting an extruding and expanding tool into the blank, then connecting one end of an extruding rod with the extruding and expanding tool, and then extruding and expanding the extruding rod into the forming die; and an extruding machine is used for pressing down the extruding rod, and after inner hole extruding and expanding are completed, the extruding rod is separated from the extruding and expanding tool and then taken out. According to the extrusion-expansion forming process for the inner hole of the wind power hollow main shaft, the forming die, the extrusion-expansion tool and the extrusion rod are used for conducting one-time extrusion-expansion forming on the blank, the needed extrusion-expansion forming force is small, the forming speed is high, the forging allowance is small, the production rate of a product can be effectively increased, the loss of raw materials of the product is reduced, and the production cost is reduced. And the working intensity of workers is reduced.

Description

technical field [0001] The invention relates to the field of manufacturing large-scale wind power main shafts, in particular to an extrusion and expansion forming process for the inner hole of a wind power hollow main shaft. Background technique [0002] With the development of wind power technology, the wind power main shaft has a trend of large-scale and lightweight development. The size of the inner hole of the wind power main shaft continues to increase. When the diameter of the inner hole of the wind power main shaft is greater than 400mm, the hollow forging process is generally adopted. Hollow forging process Generally, after punching, insert the mandrel, and use the upper flat and lower V anvil to pull out the length. The process has the following problems: [0003] 1. The elongation of the upper flat and lower V anvil belongs to a kind of asymmetric deformation up and down, which will cause uneven metal flow. When the forging is elongated, the amount of pressing dow...

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Problems solved by technology

[0003] 1. The elongation of the upper flat and lower V anvil belongs to a kind of asymmetric deformation up and down, which will cause uneven metal flow. When the forging is elongated, the amount of pressing down each time cannot be exactly the same, and the overlap between every two forgings is also It is impossible to keep consistent, resulting in uneven wall thickness after elongation, which brings difficulties to machining

Due to the uneven feeding, the two ends of the drawing are not neat, so it is necessary to use sawing or gas cutting to process the blank, which wastes raw materials and prolongs the production cycle.

[0004] 2. In order to solve the problem of uneven wall thickness and length, it is necessary to increase the forging allowance, and then remove the allowance by machining to complete the forging, which will not only waste a lot of raw materials, but also increase the production cycle and reduce the Productivity

[0005] 3. The wind power main shaft produced by this process is prone to eccentric problems of flange, shaft body and inner hole. If the operation is not done properly, there may even be a problem that the flange end is not perpendicular to the shaft body, and it is very difficult to repair

[0006] 4. The production efficiency of this process is very low. It takes more than 50 minutes for the elongation and finishing of the wind power hollow main shaft above 3MW, the degree of automation is low, and the labor intensity of workers is high.

[0007] The extrusion forming force of the inner hole by a large extruder is relatively large. Taking a 5MW wind power spindle as an example, the extrusion forming force of the inner hole has reached 50,000 tons. Due to the large extrusion forming force, the mandrel and The friction between the blanks is very large, and the demoulding of the mandrel is very difficult

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