Camshaft sand mold manufactured with tectorial membrane sand with reclaimed sand as roughing sand and manufacturing method thereof

Abstract

The invention discloses a camshaft sand mould for manufacturing coated sands, which takes regenerated sands as base sands. The invention is characterized in that the invention is a passing shaft which is composed of an upper sand mould of the coated sands and a lower sand mould of the coated and, and provided with a boss in the middle portion. A manufacturing method comprises firstly, enabling waste sands to regenerate under high temperature, secondly, producing the regenerated sand, thirdly, taking the regenerated sands as the base sands and producing the coated sands, fourthly, heating the mould to 290-310 DEG C, fifthly, inbreathing the coated sands into the camshaft sand mould through compressed air, heating for 110-130 seconds, and curing into the mold, sixthly, obtaining an intact camshaft sand mould after adhering the upper sand mould and the lower sand mould. The superiorities of the invention lie in that blank dimensions of camshaft casts can be more accurate and process redundancy can be minimized due to the low thermal expansion rate of the sands, and cost can be saved. Defects of casts as air holes can be lowered due to low air forming property, and simultaneously effects to environment can be minimized, deformation and cracks of sand moulds can be avoided due to high strength, which is beneficial to arrange and transport, and the quality of cast surfaces can be increased. Flow ability can be improved, and defective indexes of the casts can be lowered. The invention has high strength, smooth surface and good breathing property.

Description

(1) Technical field: [0001] The invention relates to a coated sand sand mold and a manufacturing method thereof, in particular to a camshaft sand mold made of coated sand using recycled sand as raw sand and a manufacturing method thereof. (two) background technology: [0002] As an important selection material, coated sand is used more and more with the development of machinery manufacturing and automobile industry. In my country, coated sand exceeds one million tons per year. In western developed countries, resin sand must be recycled after use. For example, Germany formulated and promulgated the "Waste Disposal Law" as early as 1972, and promulgated the "Circular Economy and Waste Management Law" in 1996. However, foundry manufacturers in our country either fill the pit or discard the waste sand after casting, and the non-degradable phenolic resin in the coated sand brings great harm to the environment. [0003] The 21st century should be the century of "green casting". P...

AI Technical Summary

Problems solved by technology

In our country, the foundry manufacturers either fill the waste sand after casting or discard it, and the non-degradable phenolic resin in the coated sand brings great harm to the environment.

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