Design method of rhombic grid hole hot air grate sand core

Abstract

The invention relates to a design method of a rhombic grid hole hot air grate sand core. The rhombic grid hole hot air grate sand core is characterized by consisting of a plurality of sand core units, wherein each sand core unit comprises a lower core head, an upper core head and a sand core body; the size and shape of the lower core head correspond to the size and shape of a cone frustum-shaped hole core of a corresponding porous core positioning general template for shaping; the shape and quantity of grate ventilation grid hole cores are determined according to the shape and quantity of designed grate ventilation grid holes; and each rhombic ventilation grid hole core consists of two regular triangles. Compared with the prior art, the method has the beneficial effects that: (1) according to the characteristic that the ventilation grid hole of a rhombic grid hole grate consists of two regular triangles, the cone frustum-shaped structure of a multi-hole-core positioning general template and a cone frustum-shaped lower core head which corresponds to the gravity centers of two regular triangles constituting a rhombic hole grid can be positioned accurately; and (2) due to the adoption of the cone frustum-shaped core head, the generality of the general template can be increased, and hot air furnace grates of other hole forms can be produced by using the multi-hole-core positioning general template.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a design method of a hot air grate core with rhombus grid holes. Background technique [0002] The hot blast stove grate is the main casting of the hot blast stove grate support system of the ironmaking blast furnace, which is used to carry the checker brick regenerator on the upper part. The checker brick regenerator mostly adopts dense circular hole porous checker bricks, and its circular ventilation holes are arranged in an equilateral triangle, and each circular ventilation hole directly or indirectly passes through the ventilation holes of the distribution plate and the hot blast stove grate Corresponding. For example, the diamond-shaped mesh hole furnace grate adopted by a foreign blast furnace is composed of many diamond-shaped ventilation holes. Each diamond-shaped ventilation hole in the furnace grate is composed of two regular triangles, corresponding to the nine circl...

AI Technical Summary

Problems solved by technology

To meet this precision requirement, for a hot blast stove grate with a special structure such as a rhombus grid, if the "Universal Template for Porous Core Positioning" technology with patent number ZL 00210311.7 is adopted, although it can better meet the requirements of casting sand cores. The positioning requirements in the horizontal direction of the lower part ensure that the distance between the lower core heads of the sand core is accurate, but each diamond-shaped core body corresponds to nine conical truncated core heads, and it is difficult to mold the core box; if a diamond-shaped lower core head is used, the diamond-shaped core head template It is difficult to process and manufacture, and its template has no versatility with other hole-type hot blast stove grate templates

Casting production is difficult, and the commonly used casting process tooling design is difficult to meet the production requirements

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