Ceramic casting sand for sand 3d printing Featured Image

Mchenga wa sintered ceramic wopangira maziko okhala ndi bokosi lozizira

Kufotokozera Kwachidule:

The cold box method refers to a resin sand forming process that is catalyzed/hardened by blowing in gas or aerosol, and formed instantaneously at room temperature. The common method is the triethylamine method, which uses phenolic-urethane resin and is hardened by blowing triethylamine gas. The characteristics of this process are: the core sand can be used for a long time, the mold-drawing time is short, the production efficiency is high, and the energy consumption is low.

Titumizireni imelo

Tsatanetsatane wa Zamalonda

Zolemba Zamalonda

Diesel engine castings, such as cylinder blocks, cylinder heads, intake and exhaust pipes, etc., some have complex core shapes and small partial cross-sectional areas, which are prone to false shots, fractures, etc., or veins appear in the castings due to the large expansion of silica sand. The probability of defects such as sticky sand and pores is also relatively high.

Sintered-ceramic-sand-for-foundry-with-cold-core-box-(4)

Sintered-ceramic-sand-for-foundry-with-cold-core-box-(5)

Using ceramic sand or mixing ceramic sand and silica sand in proportion, the amount of resin added is reduced by 20-30%, and the above defects have been significantly improved. At the same time, the sand core has good collapsibility, which reduces the workload of casting cleaning. As a result, more and more diesel engine casting foundries have adopted ceramic sand cold core box technology.

Ceramic Sand Property

Main Chemical Chigawo	Al₂O₃≥53%, Fe₂O₃＜4%, TiO₂＜3%, SiO₂≤37%
Maonekedwe a Mbewu	Chozungulira
Angular Coefficient	≤1.1
Kukula Kwambiri	45μm -2000μm
Refractoriness	≥1800℃
Kuchulukana Kwambiri	1.5-1.6 g/cm3
Kukula kwa Thermal (RT-1200 ℃)	4.5-6.5x10-6/k
Mtundu	Mchenga
PH	6.6-7.3
Mineralogical Composition	Soft + Corundum
Mtengo wa Acid	＜1 ml/50g
LOI	＜0.1%

Compare with other raw sand test result of Cold box process

Raw Sand	Resin Add.	2h Tensile Strength	Gas Evolution
Sintered Ceramic Sand	1.5%	2.098 MPa	10.34 ml/g
Scrubbed Sand	1.5%	1.105MPa	13.4 ml/g
Baked Sand	1.5%	1.088 MPa	12.9 ml/g
Sintered Ceramic Sand+ Scrubbed Sand	1.5%	1.815 MPa	12.5 ml/g
Sintered Ceramic Sand+ Baked Sand	1.5%	1.851 MPa	12.35 ml/g
Chromite Sand+ Scrubbed Sand	1.5%	0.801 MPa	10.85 ml/g
Chromite Sand+ Baked Sand	1.5%	0.821 MPa	10.74 ml/g

Compare with Castings defects rate of Cold box process

Raw Sand	Veins	Core Broken	Sinter	Choke	Total
Sintered Ceramic Sand	0%	2%	0%	0	2%
Scrubbed Sand	28%	12%	4%	3%	47%
Baked Sand	24%	10%	3%	2%	39%
Sintered Ceramic Sand+ Scrubbed Sand	12%	4%	1%	2%	19%
Sintered Ceramic Sand+ Baked Sand	7%	3%	2%	2%	14%
Chromite Sand+ Scrubbed Sand	13%	6%	5%	4%	28%
Chromite Sand+ Baked Sand	12%	4%	2%	2%	20%

Magawo a Particle size Distribution

The tinthu kukula kugawa akhoza makonda malinga ndi lamulo lanu.

Mesh		20	30	40	50	70	100	140	200	270	Pansi	AFS
μm		850	600	425	300	212	150	106	75	53	Pansi
Kodi	40/70		≤5	20-30	40-50	15-25	≤8	≤1				43±3
	70/40		≤5	15-25	40-50	20-30	≤10	≤2				46±3
	50/100			≤5	25-35	35-50	15-25	≤6	≤1			50±3
	100/50			≤5	15-25	35-50	25-35	≤10	≤1			55±3
	70/140				≤5	25-35	35-50	8-15	≤5	≤1		65±4
	140/70				≤5	15-35	35-50	20-25	≤8	≤2		70±5
	100/200					≤10	20-35	35-50	15-20	≤10	≤2	110±5

sand sintering

sintered sand

Ngati muli ndi chidwi ndi zinthu zathu, mutha kusankha kusiya zambiri zanu pano, ndipo tidzalumikizana nanu posachedwa.

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