Production method of double-sand mold of resin sand

Abstract

The invention relates to a production method of a double-sand mold of resin sand, which is the production method for manufacturing the sand mold by combining the resin sand and clay sand. The method particularly comprises the following steps of: packing samples; placing the clay sand; tightening the clay sand; leveling and pricking air holes; turning and drawing the mold; repairing the mold and pricking air holes; flow coating; combining cases to obtain the sand mold; and casting, and opening the cases to shake out sand to obtain a casting. The production method for manufacturing the double-sand mold by combining the resin sand and the clay sand can save resin sand usage, greatly reduce production cost and improve production efficiency on one hand, overcome the defects that the casting obtained by the recognized method for manufacturing the sand mold by adopting sodium silicate moulding sand and the like is easy to generate oxidation films, surface wrinkles and the air holes and the like, and can furthest ensure compact internal texture, and neat and beautiful appearance of the casting to obtain the casting with good quality on the other hand.

Description

technical field [0001] The invention belongs to the field of casting production methods, and relates to a resin sand double-sand molding production method for manufacturing casting sand molds by utilizing resin sand and clay sand. Background technique [0002] The molding sand used in foundry production is generally made of molding materials such as foundry sand, molding sand binder and auxiliary additives mixed in a certain proportion, and natural silica sand containing clay can also be used. According to different binders, molding sand can be divided into clay sand, water glass sand and resin sand. [0003] Clay sand is generally made of natural silica sand, clay, additives and water. The clay used in the clay sand of the green sand mold is bentonite. Due to the high moisture content in the green sand, the strength and air permeability are low, the castings obtained after pouring are prone to defects such as pores, sand inclusions, sticky sand, and sand expansion. The dim...

AI Technical Summary

Problems solved by technology

However, the yield of resin sand is not good, and single resin sand is easy to cause crack defects in castings due to poor yield of resin sand when the casting shrinks.

In addition, resin sand has a large amount of gas generation, which can easily cause pores and defects in castings.

In addition, the price of resin and hardener added when mixing and preparing resin sand is relatively high, and the cost of using resin sand for molding is relatively high; moreover, the high rejection rate and poor quality of castings will also lead to increased production costs