Vermicular graphite cast iron glass mold material and mold preparation method

Abstract

The invention discloses a vermicular graphite cast iron glass mold material and a mold preparation method. The vermicular graphite cast iron glass mold material is prepared from the following chemicalelements including3.8%-4.0% of carbon, 1.2%-1.8 % of silicon, 0.1%-0.2% of manganese, less than 0.1% of phosphorus, less than 0.03% of sulfur, less than 0.05% of magnesium, and the balance iron and other unavoidable impurity elements. According to the vermicular graphite cast iron glass mold material and the mold preparation method, the formula of vermicular graphite cast iron is optimized, the degree of graphitization of a vermicular graphite cast iron glass mold blank in the as-cast state is increased, the amount of a pearlite matrix is reduced, and the casting stress is reduced. Besides conventional alloys like ferrosilicon, there is no other alloying element added. The manganese element is self-contained in Q10 pig iron instead of being artificially added, so that the cost of the casting material is greatly reduced. More importantly, due to the small quantity of alloying elements, unpacking is carried out after the casting is naturally cooled to 250 DEG C in a casting system, theamount of pearlite in the as-cast state does not exceed 15%, and it is not necessary to perform high-temperature graphitization annealing at 930 DEG C or above.

Description

technical field [0001] The invention relates to the field of glass molds, in particular to a material for vermicular graphite cast iron glass molds and a mold preparation method. Background technique [0002] The glass mold is the main equipment for the production of glass products. It is frequently in contact with molten glass liquid at a temperature of about 1100°C. The medium plays a vital role. The surface of the inner cavity of the glass mold is required to have good high temperature resistance, wear resistance, oxidation resistance and corrosion resistance to prolong the service life. At present, the materials of glass molds mainly include cast iron, copper alloy, stainless steel, nickel-based alloy and other materials. Among them, cast iron will still occupy an absolute dominant position in the glass mold industry in the foreseeable future because of its low price, good casting and machining performance. [0003] Cast iron glass mold materials can be divided into t...

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Problems solved by technology

Second, due to the special requirements for the use of the glass mold itself, the contact surface between the inner cavity and the molten glass must be dense. Therefore, it is necessary to use a forming cold iron to chill the inner cavity of the mold, and cooperate with the aforementioned large amount of alloying elements. Therefore, a huge Material internal casting stress and white mouth

At the same time, due to the pasty solidification method of vermicular graphite cast iron, sometimes the ingate may even solidify before the casting, resulting in an isolated liquid phase area and shrinkage cavities inside the rough casting

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