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Coated sand and preparation method thereof

A technology of coated sand and silica sand, applied in the field of foundry, can solve the problems such as deformation of the coated sand cylinder body casting, excessive wall thickness, etc., and achieve the effect of eliminating the deformation of the oil channel core, reducing the deformation of the oil channel core, and improving the quality of the casting.

Inactive Publication Date: 2017-10-10
TONGLIN CASTING IND
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Problems solved by technology

[0007] The object of the present invention is to provide a kind of coated sand and its preparation method, which aims at at least partially solving the problem of avoiding deformation, gaps, sand sticking, pores, and excessive wall thickness of the existing coated sand in the process of casting molding. Inferior defects, this is a technical problem that needs to be solved urgently

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  • Coated sand and preparation method thereof
  • Coated sand and preparation method thereof

Examples

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no. 1 example

[0029] This embodiment provides a kind of coated sand, and this coated sand comprises pearl sand, resin, curing agent, coupling agent, lubricant, auxiliary material and silica sand; Wherein, pearl sand accounts for 80%~90% of the total weight of coated sand %, the resin accounts for 1% to 3% of the total weight of the coated sand, the curing agent accounts for 0.5% to 1% of the total weight of the coated sand, the coupling agent accounts for 0.04% to 0.08% of the total weight of the coated sand, and the lubricant accounts for 0.1% to 0.5% of the total weight of the coated sand, auxiliary materials account for 0.3% to 0.7% of the total weight of the coated sand, and the balance is silica sand.

[0030] Specifically, the pearl sand accounts for 85% of the total weight of the coated sand, the resin accounts for 2% of the total weight of the coated sand, the curing agent accounts for 0.7% of the total weight of the coated sand, and the coupling agent accounts for 0.06% of the total...

no. 2 example

[0053] The present embodiment provides a kind of preparation method of coated sand, and the preparation method of coated sand comprises the following steps:

[0054] Step A: Preheat the pearl sand and silica sand.

[0055] Among them, the preheating temperature is preferably 130°C to 150°C. Pearl sand accounts for 80% to 90% of the total weight of the coated sand; preferably, pearl sand accounts for 85% of the total weight of the coated sand, and the balance is silica sand.

[0056] Pearl sand includes alumina, titanium dioxide, iron oxide and silicon dioxide; among them, aluminum oxide accounts for 78% to 85% of the total weight of pearl sand, titanium dioxide accounts for 1.5% to 3.5% of the total weight of pearl sand, iron oxide Accounting for 2%-4% of the total weight of the pearl sand and silica accounting for 8%-15% of the total weight of the pearl sand. Preferably, aluminum oxide accounts for 82% of the total weight of the pearl sand, titanium dioxide accounts for 3% ...

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Abstract

The invention provides a coated sand and a preparation method thereof, which relate to the technical field of casting. The coated sand includes pearl sand, resin, curing agent, coupling agent, lubricant, auxiliary materials and silica sand; wherein, the pearl sand accounts for 80% to 90% of the total weight of the coated sand, and the resin accounts for 1% to 3% of the total weight of the coated sand, the curing agent accounts for 0.5% to 1% of the total weight of the coated sand, and the coupling agent accounts for 0.04% to 1% of the total weight of the coated sand 0.08%, the lubricant accounts for 0.1%-0.5% of the total weight of the coated sand, the auxiliary material accounts for 0.3%-0.7% of the total weight of the coated sand, and the balance is the silica sand. The coated sand and its preparation method provided in this embodiment can effectively eliminate and reduce casting defects such as oil channel core deformation, cylinder notch, sand sticking, air holes, and wall thickness tolerance, and improve the quality of castings.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a coated sand and a preparation method thereof. Background technique [0002] With the advancement of engine technology, some new cylinder blocks that have appeared in recent years have structures that are difficult to process. For example, there is no sand hole on the side of the water cavity, the oil passage cavity runs through the entire cylinder body and has a large curvature, there is a narrow and thin water passage structure in the water cavity, and there are even castings in which the cylinder barrel and the cylinder head are integrated. [0003] In order to ensure the compact arrangement of the engine, today's engine block structure design, the oil passage cavity runs through the cylinder block from top to bottom, and the crankshaft cavity has the characteristics of conformal bending, and may even be accompanied by bifurcation and other structures. Therefore, the longer...

Claims

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Application Information

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IPC IPC(8): B22C1/02B22C9/10
CPCB22C1/02B22C9/10
Inventor 聂越姚太忠
Owner TONGLIN CASTING IND
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