Combined model structure for improving product yield of evaporative pattern casting process for cast iron pipe fittings

Abstract

The invention relates to the field of evaporative pattern casting and in particular relates to a combined model structure for improving product yield of an evaporative pattern casting process for cast iron pipe fittings. The combined model structure comprises a central pipe fitting model and a plurality of peripheral pipe fitting models, wherein the peripheral pipe fitting models are arranged at the periphery of the central pipe fitting model by taking the central pipe fitting model as a center; inner runner models are arranged between the bottom of the central pipe fitting model and the bottoms of the peripheral pipe fitting models and used for connecting two pipe fitting models; a sprue cup is arranged at the top of the central pipe fitting model; a connection runner model is arranged between the top of the central pipe fitting model and the spure cup; dead head models are arranged at the tops of the peripheral pipe fitting models. The models are foam plastic models applied to the evaporative pattern casting process. The combined model structure is simple and reasonable in structure, capable of reducing the use amount of iron liquid in the evaporative pattern casting of the cast iron pipe fittings, reducing the production cost and improving the product yield of an evaporative pattern casting process for cast iron pipe fittings and applicable to the evaporative pattern casting of same types of products made of different materials.

Description

technical field [0001] The invention relates to the field of lost foam casting, in particular to a mold set structure for improving the yield rate of cast iron pipe fittings lost foam casting process. Background technique [0002] The lost foam casting process is a near-net-shape casting process, which is energy-saving and environmentally friendly. It is called the green casting process of the 21st century by the foundry industry at home and abroad. The production process of the lost foam casting process, including: a. bead pre-foaming, b. mold making, c. white mold curing and bonding, d. coating, e. drying, f. mold assembly, j. Negative pressure pouring, h. Cleaning out of the box to get the product. [0003] The design of the pouring system of the lost foam casting process is basically the same as that of other casting process pouring systems, that is, various pouring methods such as top pouring, bottom pouring, side pouring, and step pouring can be adopted. [0004] Whe...

AI Technical Summary

Problems solved by technology

[0004] When producing single-socket or double-socket cast iron pipe fittings by the lost foam casting process, the bottom pouring method is often used, but because the single-socket or double-socket cast iron pipe fittings are long, the sprue set in the gating system needs to use There is a lot of molten iron, which makes the process yield rate during production low, resulting in high production costs

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