Casting method for glass mould blank

Abstract

A casting method for glass mould blank belongs to the field of glass mould casting and comprises first manufacturing a wooden model base plate provided with a pair of bottle moulds, a pouring gate mould, a pouring channel mould and a filter screen according to the size of the glass mould blank; then arranging a model frame cover on the wooden model base plate, and filling pulverized coal sand in a containing cavity of the model frame; overturning the model frame filled with the pulverized coal sand and the wooden model base plate together, removing the wooden model base plate to obtain a casting mould, and arranging the filter screen into the filter screen cavity; arranging a pair of cold iron cores onto bottle mould cavities; pouring melted iron water from the pouring gate, enabling the iron water sequentially pass through the pouring channel to be filtered by the filter screen to enter the bottle mould cavities, and removing the cold iron cores, the model frame and the pulverized coal sand till the liquid level of the iron water reaches the horizontal height identical with the upper plane of the pouring gate to obtain the glass mould blank. The casting method for the glass mould blank has the advantages of improving casting efficiency of the glass mould blank, can not cause body hurt to an operator, ensures physical properties of a glass mould, has economic efficiency, and can ensure the quality of a cast.

Description

Technical field [0001] The present invention is the field of glass mold casting technology, which involves a casting method for glass mold rough. Background technique [0002] As the industry knows, because the inner cavity of the glass mold needs to have a dense and cold layer, glass mold blanks are usually obtained through casting. The currently used casting process is to use wet sand and the upper and lower box casting process. Among them, of whichThe outlet is composed of the casting cavity, the corresponding pouring mouth, the internal watering track, the filter, and the output, and the cold iron mud is placed.Because the production of the wet sand casting process of the upper and lower boxes needs to be set up enough to make a sufficient replenishment to ensure enough metal liquid supply, the utilization rate of iron water is low, usually between 60-75%, resulting in mold manufacturingIncrease cost, waste raw materials and energy; at the same time, the impact of the long -t...

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Problems solved by technology

[0004] However, the above-mentioned CN101823121B still has the following shortcomings: the first is that the casting efficiency of the glass mold blank is not high, because both the phenolic resin and the isocyanic acid resin constituting the resin sand itself exist Defects, such as phenolic resin has the advantages of good thermal stability, but because it is also a good thermal insulation material at the same time, it takes a long time for the glass mold blank to cool in the sand box, which affects production efficiency; the second is that it is not environmentally friendly, because During the use of resin sand, the substances produced by the high temperature can irritate and damage the workers' eyes and upper respiratory tract. Low concentrations can cause tears and coughing, and high concentrations can cause eye redness and chemical burns. The risk of loss of smell and damage to the upper respiratory mucosa; third, it has a certain impact on the formation of D-type graphite, which is not conducive to improving the physical properties of glass mold blanks, because D-type graphite is recognized as a better glass mold graphite in the industry structure, and D-type graphite is a kind of supercooled graphite, which needs to be produced under a large degree of supercooling, and the excellent heat preservation effect of resin sand greatly reduces the generation of D-type graphite, especially if the heat preservation time is too long, it is easy to It leads to coarse grains of the material, reduced mechanical properties, and low hardness; fourth, it is uneconomical, because the raw materials that make up the resin sand are relatively expensive, resulting in high casting costs; fifth, the utilization rate of molten iron is still insufficient To achieve a satisfactory level, because, due to the existence of the sprue mold, the sprue mold needs to be cut off and returned to the furnace after the casting is completed; the sixth is that there is a risk of coarse grains of the casting and deformation of the casting, because the molten iron flows from two When the inrunner enters, it will have a large impact on the molding sand, which will lead to coarse grains and deformation of the casting to a certain extent.

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