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Composite precoated sand and its prepn process

A technology of coated sand and film, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of thinning casting wall thickness, hindering liquid flow, and difficult grinding, etc., to reduce the amount of binder , Improve stability, smooth surface effect

Inactive Publication Date: 2004-09-08
罗丙太
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem existing in the current coated sand and its manufacturing process is that when the hot core made of coated sand is pouring castings, especially pump body, cylinder body, and valve body castings, due to heat, the sand particles will expand, and the stress of expansion will increase. When it reaches a certain value, cracks will appear in the part of the thermal core
These burr defects are often due to the difficulty of grinding, or the uneven inner surface of the casting after grinding, resulting in thinning of the wall thickness of the casting, which makes the casting a waste product
If the casting is a pump body, the burrs of the fluid passages in the pump body are often not repaired or not repaired thoroughly, which hinders the flow of liquid and affects the performance of the pump.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Screen coke particles with a particle size of 0.5 mm.

[0019] 2) Heat the coke particles to 160°C, add phenolic resin when it cools down to 140°C, the ratio of the added amount to the coke particles is 2:100 by weight, and start mixing in the sand mixer.

[0020] 3) Add urotropine after 1 minute, and the ratio of the added amount to the phenolic resin is 10:100 in parts by weight. After continuing to knead for 2 minutes, calcium stearate was added, and the ratio of the amount added to the phenolic resin was 3: 100 in parts by weight. Continue kneading for 3 minutes and then add calcium stearate, the ratio of the added amount to the phenolic resin is 3:100 in parts by weight, mix evenly, then go out of the sand mixer, cool, crush, and sieve to obtain coated coke finished product. The finished product is stored separately and is to be mixed into the primary material of coated sand.

[0021] 4) Manufacture the coated sand according to the general coated sand product...

Embodiment 2

[0023] In addition to step 1) the particle size of the screened coke particles is 2mm, step 2) heating the coke particles to 170 ° C, cooling to 150 ° C and adding the amount of phenolic resin accounts for 5% of the initial material weight ratio of the coke particles, step 3) adding black The amount of rotropine accounts for 25% of the weight ratio of the phenolic resin, and the amount of adding calcium stearate accounts for 7% of the weight ratio of the phenolic resin, and step 4) the ratio of the finished product of coated coke grains blending accounts for the weight ratio of the first material of the coated sand Except 6%, other is with embodiment 1.

Embodiment 3

[0025] In addition to step 1) the particle size of the screened coke particles is 1mm, step 2) heating the coke particles to 165 ° C, cooling to 145 ° C and adding the amount of phenolic resin accounts for 3% of the initial material weight ratio of the coke particles, step 3) adding black The amount of rotropine accounts for 15% of the weight ratio of the phenolic resin, and the amount of adding calcium stearate accounts for 5% of the weight ratio of the phenolic resin, and step 4) the ratio of the finished film-coated coke particle blending accounts for the weight ratio of the initial material of the coated sand Except 4%, other is with embodiment 1.

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Abstract

The present invention provides one new kind of pre-coated sand including coke grains in the quantity of 2-6 % of sand weight. The present invention also provides the making process of the pre-coated sand, including a coke grain and sand coating step. The pre-coated sand may be used to make sand core for obtaining casting with compact and smooth surface.

Description

technical field [0001] The invention relates to a composite coated sand for core making and a preparation process thereof. Background technique [0002] The foundry industry is the largest basic industry in the machinery manufacturing industry. The quality of casting directly affects the quality of mechanical products. Coated sand is a molding material for shell-type precision casting. It has the characteristics of good preservation, high dimensional accuracy and smooth surface of the produced castings. It can be used in the production of cast steel, cast iron, alloy castings and non-ferrous metal castings. Coated sand is usually made of quartz sand as raw sand, supplemented with binder and curing agent. Such processes are disclosed in the prior art. [0003] Disclosed in Chinese patent 93116639 is a kind of manufacturing process of coated sand, which includes eight steps. In this process, not only the above-mentioned components are added, but also a certain amount of aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22
Inventor 罗丙太
Owner 罗丙太
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