Coated sand for medium thickness stainless steel castings

A technology of stainless steel and coated sand, applied in casting molds, casting molding equipment, metal processing equipment, etc., can solve the problems of affecting the dimensional accuracy of castings, unable to prepare stainless steel castings, etc., and achieve the effect of convenient operation, clear outline and cost reduction.

Active Publication Date: 2021-07-23
科左后旗兴达砂业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make the surface quality of castings reach the level of investment casting, people have used the method of spraying zircon powder and other coatings on the shell surface, but it will inevitably affect the dimensional accuracy of castings.
Therefore, so far, people have not been able to prepare medium-thick stainless steel castings by means of coated sand shell casting.

Method used

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  • Coated sand for medium thickness stainless steel castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh raw materials: Pearl sand 50kg, Hainan sand 30kg, white corundum 15kg, iron sand 5kg, phenolic resin 1.8kg, urotropine 0.306kg, calcium stearate 0.144kg; said pearl sand, Hainan sand, white corundum and iron sand As raw sand, its particle size is 70 / 140 mesh; the ratio is shown in Table 1;

[0016] Table 1

[0017] Mesh 70 mesh 100 mesh 120 mesh 140 mesh Proportion wt% 22.7 52.8 20.2 4.3

[0018] Mix Baozhu sand, Hainan sand, white corundum and iron sand evenly as raw sand, keep warm at 200°C for 15 minutes, wait for the temperature of the raw sand to drop to 135°C, add phenolic resin, stir for 90 seconds, then add urotropine and stearin Calcium acid is stirred, cooled, crushed, and then sieved to obtain coated sand for medium-thickness stainless steel castings.

[0019] figure 1 It is a comparison chart of the surface quality of coated sand shell casting and investment casting stainless steel castings. The thickness of the casti...

Embodiment 2

[0021] Weigh raw materials: Pearl sand 50kg, Hainan sand 35kg, white corundum 12kg, iron sand 3kg, phenolic resin 1.6kg, urotropine 0.304kg, calcium stearate 0.096kg; said pearl sand, Hainan sand, white corundum and iron sand As raw sand, its particle size is 70 / 140 mesh; the ratio is shown in Table 1;

[0022] Mix Baozhu sand, Hainan sand, white corundum and iron sand evenly as raw sand, keep warm at 200°C for 20 minutes, wait for the temperature of the raw sand to drop to 125°C, add phenolic resin, stir for 100 seconds, then add urotropine and stearin Calcium acid is stirred, cooled, crushed, and then sieved to obtain coated sand for medium-thickness stainless steel castings. The coated sand has the properties of high strength, high temperature resistance, and low gas generation. It can cast stainless steel castings with a thickness of 10mm-40mm and a size of 800mm. It is suitable for stainless steel castings with a pouring temperature greater than 1650°C. The surface qualit...

Embodiment 3

[0024] Weigh raw materials: Pearl sand 45kg, Hainan sand 38kg, white corundum 3kg, iron sand 4kg, phenolic resin 1.7kg, urotropine 0.34kg, calcium stearate 0.068kg; said pearl sand, Hainan sand, white corundum and iron sand As raw sand, its particle size is 70 / 140 mesh; the ratio is shown in Table 1;

[0025] Mix Baozhu sand, Hainan sand, white corundum and iron sand evenly as raw sand, keep warm at 200°C for 18 minutes, wait for the temperature of the raw sand to drop to 130°C, add phenolic resin, stir for 95 seconds, then add urotropine and stearin Calcium acid is stirred, cooled, crushed, and then sieved to obtain coated sand for medium-thickness stainless steel castings. The coated sand has the properties of high strength, high temperature resistance, and low gas generation. It can cast stainless steel castings with a thickness of 10mm-40mm and a size of 800mm. It is suitable for stainless steel castings with a pouring temperature greater than 1650°C. The surface quality o...

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Abstract

A kind of coated sand for stainless steel castings with medium thickness, comprising the following components by weight fraction, 50-55 parts of pearl sand, 30-35 parts of Hainan sand, 8-15 parts of white corundum, 2-5 parts of iron sand, bonding 1.6-2.0 parts of phenolic resin, the addition of curing agent urotropine is 15%-20% of the mass percentage of phenolic resin, and the addition of lubricant calcium stearate is 4% of the mass percentage of phenolic resin -8%. The invention has simple process, convenient operation, easy realization and no pollution. It is suitable for stainless steel castings with a pouring temperature greater than 1650°C. The obtained stainless steel castings have clear contours, precise dimensions, surface roughness reaching the level of investment casting, and can be machined without machining or only a small amount of machining.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to coated sand, in particular to a coated sand for medium-thick stainless steel castings with a casting thickness of 10mm-40mm and a size up to 800mm. Background technique [0002] The traditional stainless steel casting process uses investment casting. The production cost of the investment casting process is high, the process is cumbersome, the production cycle is long, the efficiency is low, there are many manual operations, and the yield is low. With the continuous rise of raw and auxiliary materials and labor prices, and the country's increasing environmental protection requirements year by year, it has become inevitable to find a low-cost, environmentally friendly, convenient and practical casting process to replace the investment casting process. Compared with investment casting, coated sand shell casting has low production cost, simple shell making, short production cycle, hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/00
CPCB22C1/00
Inventor 单艳军李青春杨晓平武晓峰赵作福
Owner 科左后旗兴达砂业有限责任公司
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