End cover box for horizontal centrifugal casting of roll

Abstract

The invention discloses an end cover box for horizontal centrifugal casting of a roll. The end cover box is made of carbon steel, a through hole for casting of melted iron is arranged on the end cover box along the central axis and is a three-stage stepped hole in a trumpet shape, the first stepped hole and the second stepped hole are in a cone shape, the cone angle of the first stepped hole is 10-20 degrees, the cone angle of the second stepped hole is 100-120 degrees, and the third stepped hole is a straight hole; and thread lines which are 5mm in depth and 3mm in width are arranged on the inner surface of the through hole. According to the end cover box, adhesion of refractory coating is facilitated, washing of iron liquid to the refractory coating is reduced in a casting process, the service life of the end cover box is prolonged, energy resources can be saved, the working efficiency is improved, the production cost is reduced, and quality of products is guaranteed.

Description

Technical field [0001] The present invention relates to a new-shaped process device used in the technical field of centrifugal casting, in particular to an end cover box used in pouring. Background technique [0002] Casting roll is a kind of casting that needs to bear large load and surface wear resistance. Centrifugal casting is currently the main production process for rolls. In the process of centrifugal casting to produce roll blanks, horizontal centrifugal casting machines are widely used. The cavity of the horizontal centrifugal casting machine is arranged horizontally. In the casting production process, one end cover box is set at the front and back ends of the mold, so that a cavity is formed between the mold and the front and rear end cover boxes. When pouring, the casting is first placed on the centrifugal casting machine, and molten iron is poured into it. In the rotating cavity, the molten iron is used to form the outer layer of the roll on the inner surface of th...

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Problems solved by technology

[0003] At present, the end cover box used for centrifugal casting of roll blanks is an iron end cover box, and a refractory cement layer with a thickness of 50mm~150mm is made inside the end cover box, and the refractory cement layer is dried for production and use, but the refractory cement layer requires Long-term health preservation and drying, the preparation period is long, and it needs to be made 6 days in advance, which is not conducive to improving production efficiency; because the refractory cement layer is thicker, the temperature of the end cover box when drying the refractory cement layer needs to be above 300 °C Allow to dry for 72 hours before use

The drying temperature is high, and it takes a long time to dry, which consumes a lot of energy; in addition, the quality stability of the refractory cement layer is poor. After the core molten iron is poured into the cavity, the molten iron will react violently with the refractory cement layer. , resulting in uneven thickness of the outer layer of the casting blank, and slag inclusions are prone to appear in the inner and outer bonding layers, which brings potential risks to product quality

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