Preparation method of casting box sealing paste

Abstract

The invention discloses a preparation method of casting box sealing paste, and belongs to the technical field of casting materials; the method is simple in preparation method and wide in raw materialsource, and the prepared casting box sealing paste has good plasticity, is easy to form, good in sealing performance, high in refractoriness and strong in adhesive force, and can prevent box seam flash and fire escape during casting of a casting mold. The casting piece dimensional accuracy is improved; the paste is convenient to use, uniform and smooth in coating, capable of obviously saving working hours, good in box sealing effect and free of box cushioning. Castings do not produce blank seams; the finished product rate is greatly improved, the shelf life is long, the shelf life at normal temperature is long, hardening is avoided in winter, and an extrusion opening is not sealed and frozen.

Description

technical field [0001] The invention relates to the technical field of casting materials, in particular to a preparation method of casting sealing mud paste. Background technique [0002] The sealing strip is also called the sealing mud strip, and the sealing mud is to prevent the fire from running out during pouring. The oily fiber rope, asbestos rope, mud strip, etc. with good plasticity are placed on the parting surface along the periphery of the cavity. Sealing strips are oily fiber ropes, asbestos ropes, mud strips, etc. placed on the parting surface of the mold to prevent fire from running out during pouring. The sealing strip has good plasticity and its diameter is 8~10mm. When closing the box, place the sealing strip on the parting surface of the lower mold, arrange it for a week along the outer contour of the cavity, and then close the box. The sealing mud strips are the mud strips placed on the parting surface to prevent metal leakage when the boxes are closed. ...

AI Technical Summary

Problems solved by technology

In the last century, in the 1960s, Zhou Ronghua introduced a formula of box-sealing mud in the magazine "Metal Processing (Heat Processing)", which used loess, fine sand: 4 points, salt, mixed with water, and kneaded in his hand It is suitable that it is neither loose nor dry. The sealing mud with the above formula is not easy to crack and has a good sealing effect, but it can prevent the molten iron from flowing out from the gaps in the joint surface, avoiding flashing of castings or The potential safety hazards caused by molten iron run-off are not good in application. Its viscosity is poor, its refractoriness is low, its plasticity is poor, and its storage period is short. At present, there are still manufacturers using this corresponding similar seal that has been used for nearly half a century. Box mud, Chinese patent CN201210129150.3 A kind of sealing strip for casting and molding and its preparation method. It is not a sealing mud paste. It uses mixed bonding grease to bond asbestos wool, sillimanite powder, kaolin, and bentonite. However, under high temperature and refractory conditions in actual use, degassing and fire escape often occur when grease burns, and the grease burns and turns black. The purpose of adding grease itself is to have good plasticity, but it has also become one of the defects, and grease is easy to store under long-term storage. Moldy and deteriorated, and the cost is high. Chinese patent CN2017105678096 discloses a method of moisturizing and sealing the box-sealing mud paste. It is expected to use diesel oil, rubber, etc. to improve plasticity, but the existing defects cannot be avoided. Those skilled in the art urgently need to develop a A preparation method of casting sealing mud paste, which meets the existing use needs and performance requirements

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