Manufacturing tooling and efficient production method of large height-diameter ratio circular casting billet

Abstract

The invention relates to the field of manufacture of large height-diameter ratio circular casting billets, namely circular ingots, for shafts, particularly to a manufacturing tooling and an efficient production method of a large height-diameter ratio circular casting billet, namely a circular ingot. The problems of the quality problems of casting billet shrinkage cavity, porosity and cracks and the low manufacturing efficiency are solved. The manufacturing tooling is provided with a casting system, an ingot mould, a heat insulation feeder head, a heat insulation cover and a slow cooling pit. Before casting, the ingot mould, the casting system and a base plate are assembled in a ground pit and the heat insulation feeder head is preheated. The casting is performed in a slow casting mode. The mould release is performed after the casting in a high-temperature mould release mode and the heat insulation is performed on a steel ingot through the heat insulation cover. After the heat insulation, the steel ingot is hung into the slow cooling pit for slow cooling or directly enters a heat treatment work station through hot delivery to be heated and prepared to be forged. The manufacturing tooling and the efficient production method of the large height-diameter ratio circular casting billet are suitable for the efficient production of the circular casting billet and the high-quality casting billet is provided for the production of the shafts, barrel type forging parts and bar materials, wherein the diameter of the circular casting billet is more than Phi 200 mm and the height-diameter ratio of the circular casting billet is larger than 3.

Description

technical field [0001] The invention relates to the field of manufacturing a round billet (round ingot) with a large height-to-diameter ratio for shafts, in particular to a manufacturing tool and an efficient preparation method for a round billet (round ingot) with a large height-to-diameter ratio. Background technique [0002] A large number of blanks are needed in the market to make shafts, cylinders and bars. Generally, conventional round steel ingots with large top and small bottom are used as the blanks for these forging products. Since the height-to-diameter ratio of conventional steel ingots is generally lower than 3 , the utilization rate after forging is between 65% and 75%. In order to improve the market competitiveness of products, steel ingot manufacturers continue to improve the utilization rate and internal quality of steel ingots through technological improvement. [0003] At present, if the height-to-diameter ratio of conventional steel ingots is increased t...

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Problems solved by technology

[0003] At present, if the height-to-diameter ratio of conventional steel ingots is increased to more than 3 (large height-to-diameter ratio), severe shrinkage cavities will appear in the core of the steel ingot, which often leads to the failure of the product to meet the flaw detection requirements after forging, seriously affecting product production.

In order to overcome the problem of defects in the center of round billets with large height-to-diameter ratios, some companies use electroslag remelting to manufacture such round billets. Facts have proved that this production method not only has low production efficiency, but also high production costs, and the products do not have market competition. force

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