Molding sand preparation method for casting 350-kilometer axle boxes

Abstract

The invention relates to a molding sand preparation method for casting 350-kilometer axle boxes, and belongs to the technical field of casting axle boxes of railways. The molding sand preparation method includes the steps that firstly, the proportioning of molding sand is quartz sand of 100% by mass, binder and inorganic hardener; the binder is composed of phenolic resin and powder coupling agents, wherein the amount of phenolic resin is 1.6-2.5% of the quartz sand by mass and the amount of powder coupling agents is 10-50% of the quartz sand by mass; secondly, the sand is subjected to mixing;thirdly, air holes are formed; fourthly, a blowing hardening process is carried out; and fifthly, molding is carried out. A developed two-component carbon dioxide hardening resin is used as a raw material; a carbon dioxide hardening process is adopted to prepare the molding sand for casting 350-kilometer axle boxes of American railways, and according to the preparation method, the efficiency is high, the raw materials can be reused, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of railway casting axle boxes, in particular to a method for preparing molding sand for casting 350km axle boxes. Background technique [0002] At present, with the rapid development of China's high-speed rail, the demand for casting 350km axle boxes is relatively large, and the axle boxes are used for train buffer devices, important components connected between carriages, and play the role of buffer traction. Molding sand is a necessary material for the production of this kind of box, but at present, domestic manufacturers generally use traditional techniques and materials to produce this casting 350km axle box. The method is: quartz sand + clay (dry mixing for 2-3 minutes), and then Add 7-8% water glass and mix for 5-7 minutes; however, the traditional process and materials to prepare the box are more serious to environmental pollution, especially water glass, which may cause serious pollution after the su...

AI Technical Summary

Problems solved by technology

Molding sand is a necessary material for the production of this kind of box, but at present, domestic manufacturers generally use traditional techniques and materials to produce this casting 350km axle box. The method is: quartz sand + clay (dry mixing for 2-3 minutes), and then Add 7-8% water glass and mix for 5-7 minutes; however, the traditional process and materials to prepare the box are more serious to environmental pollution, especially water glass, which may cause serious pollution after the surface water flows into the drinking water source , these problems make the existing 350km axle box production not meet the current requirements for the green casting theme, and the traditional process and materials required to prepare the box have a long production cycle and high cost, which cannot meet the requirements for casting the 350km axle box For production demand, there is an urgent need for suppliers who can produce in batches and have a short production cycle. Under this background, it is imminent to develop new processes and new materials.