Ductile iron pouring system with filtering and positioning device and use method of ductile iron pouring system

Abstract

The invention provides a ductile iron pouring system with a filtering and positioning device and a using method thereof.The ductile iron pouring system comprises a pouring system body, and the pouring system body is in a stepped groove shape and is divided into an upper groove and a lower groove; a plurality of filter screens which are tightly arranged in the length direction of the pouring system are arranged in the lower groove; the groove wall of the upper groove is provided with a convex positioning spigot between two adjacent filter screens, and a filter screen positioning device mounted in the upper groove is arranged between two opposite positioning spigots; the filter screen positioning device is of a gantry type structure, the arrangement direction of two supporting legs at the bottom of the filter screen positioning device is parallel to the width direction of the pouring system, the outer side of each supporting leg is in contact connection with the groove bottom of the upper groove, the inner side of each supporting leg is located above the filter screen, and a gap of 1-2 mm is formed between the inner side of each supporting leg and the filter screen. Cover plate sand core modeling is omitted, the model manufacturing cost is reduced, the modeling work efficiency is improved, the cover plate sand core does not need to be researched during box closing, and the operation difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of casting and pouring systems for wind power ductile iron parts, in particular to a ductile iron pouring system with a filter positioning device and a method for using the same. Background technique [0002] Wind power ductile iron parts have extremely high requirements on product surface quality, and the acceptance level of MT flaw detection can reach level 2, or even level 1. In order to meet such quality requirements, the purity of molten iron must be guaranteed as much as possible. For this reason, the casting pouring system is equipped with a ceramic filter screen to filter the molten iron. At the same time, in order to prevent the filter screen from floating or shifting during the washing process of the molten iron, the traditional process design uses a cover plate sand core to press the filter screen, which is effective. Realized the purification purpose of molten iron. The cover plate sand core an...

AI Technical Summary

Problems solved by technology

However, in the actual production process, it is found that it is difficult to fit the cover plate core and the sand mold without gaps during assembly. During the pouring process, molten iron penetrates through the gap, so that the horizontal gate and the cover plate sand core are often completely wrapped by molten iron. The formation of sintered "iron-sand mixture" brings great difficulty to the cleaning of castings, which is also the root cause of the sand sticking problem at the horizontal gate of this project

Due to the defect of sticky sand in the pouring system, the recycled material is forced to be graded. The low-grade recycled material that is barely reused will generate more scum during the smelting process, and it will take a lot of man-hours to remove the slag, which directly prolongs the smelting time, resulting in In addition to the increase in electricity costs, the labor intensity of slag removal at high temperatures is extremely high, and the returned materials with severe sand stickiness are forced to be used as residual materials and sold at a reduced price, resulting in waste of raw materials and greatly increasing the cost of returning to the furnace

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