Manufacturing method of large-sized cast steel part lost foam mold

Abstract

The invention relates to a production method of a lost foam mold, in particular to a manufacturing method of a large-sized cast steel part lost foam mold. The method sequentially comprises the following steps: determining a manufacturing material of the lost foam mold; manufacturing the lost foam mold; performing surface treatment; shaping; controlling dimension in the process. According to the manufacturing method, the production cost is reduced, the manufacturing period is shortened, the production efficiency is improved, and multiple times of shaping production can be realized through one set of lost foam mold.

Description

technical field [0001] The invention relates to a production method of a lost foam mold, in particular to a manufacturing method of a large steel casting lost foam mold. Background technique [0002] Lost foam casting is to use expandable foam plastics such as polystyrene as the mold, brush the refractory paint and dry it, then bury it in dry sand and vibrate the shape, pour it under negative pressure to vaporize the model, and the liquid metal occupies the position of the model , a new casting method that forms a casting after solidification and cooling. Due to the characteristics of high dimensional accuracy of castings, flexible design, green environmental protection, and low production cost, lost foam casting has developed rapidly in recent years and its application has become more and more common. [0003] Existing technical process: According to the EPC process, the foam plastic model is made first, painted with special paint, dried and placed in a special sand box, f...

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Problems solved by technology

[0003] Existing technical process: According to the EPC process, the foam plastic model is made first, painted with special paint, dried and placed in a special sand box, filled with dry sand, compacted by three-dimensional vibration, poured under vacuum, and the model gasifies and disappears. The molten metal replaces the model to replicate the same casting as the foam plastic mold. After condensation, the vacuum is released, and the casting is taken out of the loose sand for the next cycle. The existing technology has the following characteristics and limitations that are difficult to overcome: 1) Using dry sand That is to say, filling the raw sand and vacuuming the molding sand to fix the molding sand requires high equipment. Considering the scope of use of the corresponding equipment, such as vibrating tables and sand boxes, the cavity is prone to collapse during the pouring process; 2) A set of foam plastic molds can only Use once; 3) It is not suitable for single-piece small batch order production; 4) In the case of narrow inner cavity channels or interlayers on the structure, it is necessary to conduct experiments before adopting the lost foam process before it can be put into production, and the production cost is high. The cycle is long; 5) The order of applicability of the lost foam mold to the casting material is roughly: gray cast iron - non-ferrous alloy - ordinary carbon steel - ductile iron - low carbon steel and alloy steel, it can be seen that cast steel parts Not suitable for lost foam molds

[0004] So far, there is no way to overcome the above drawbacks

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