CN103624210A

CN103624210A - Coating for dry clay sand mould for thick wall steel piece

Info

Publication number: CN103624210A
Application number: CN201310590383.8A
Authority: CN
Inventors: 龚树林
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-18
Filing date: 2013-11-18
Publication date: 2014-03-12

Abstract

The invention discloses a coating for dry clay sand mould for a thick wall steel piece. The coating comprises the following components in parts by weight: 43-50 parts of quartz powder, 6-8 parts of boron concrete, 5-8 parts of rosin, 6-8 parts of bentonite, 1-3 parts of red sands, 2-5 parts of phenolic resin, 4-6 parts of high bauxite clinkers and 10-12 parts of water. According to the preparation method, the mould sand is free of coal powder and straw powder and plant ash are mainly taken as anti-sticking assistants, so that the cost is expected to be lowered, and the surface smoothness of a cast is improved.

Description

Heavy wall steel part clay sand dry type coating

Technical field

The present invention relates to casting field, particularly sand casting field.

Background technology

At present, with the foundry goods that sand casting is produced, account for 80% of total foundry goods.The Modeling Material of sand casting occupies an important position in Foundry Production, and it directly affects energy resource consumption, the environmental pollution of Foundry Production, and the quality of foundry goods, production efficiency and cost.Domestic and international widely used coal dust clay green-sand, generally by the mixed system of roughing sand, binding agent, coal dust additive etc. and water, formed, there is certain anti-scab effect and the cost of material is low, production efficiency is high, but its consumption is large, discharge is serious, at casting process coal dust firing, decompose and produce toxic gas and pollute.

Therefore coal dust clay green-sand has been not suitable with the needs of foundary industry scientific development and the Environment Protection Policy that current consumption reduction reduces discharging.So in recent years, in order to reduce the pollution of coal dust clay-bonded sand to environment, founder author managed to find suitable substitute always.

Summary of the invention

For the deficiencies in the prior art, one of object of the present invention is to provide heavy wall steel part clay sand dry type coating, and this molding sand does not add coal dust, mainly take stalk powder, plant ash is antiseized auxiliary agent, to reducing costs, and improves surface finish of casting.

For achieving the above object, the technical solution used in the present invention is:

Heavy wall steel part clay sand dry type coating, by the following component in weight portion, formed: silica flour 43-50 part, boron coagulates native 6-8 part, rosin 5-8 part, bentonite 6-8 part, red sand 1-3 part, phenolic resins 2-5 part, alumine be who knows 4-6 part, water 10-12 part, concrete preparation method is, 1) by proportioning, weigh silica flour, the solidifying soil of boron, rosin, add the water of total amount 45-50% to put into together in edge runner, constantly to adding appropriate alcohol to make material reach suitable humidity in edge runner, be paste, the paste product obtaining from edge runner is heated to after 350 ℃ with 15 ℃/h, with 10 ℃/h, cool to room temperature again, finally carry out drying and processing, after oven dry, be ground into granular product, 2) by proportioning weigh that alumine be who knows, phenolic resins, red sand, put into together puddle mixer and be dry mixed, mix 2.5-3 hour, 3) in puddle mixer, add again step 1) product and bentonite, remaining water, mix after 3-4 hour, shake out.

Described silica flour granularity is 80-100 order.

The beneficial effect of the casting sand that contains blast-furnace cinder of the present invention is:

(1) molding sand of the present invention is not containing coal dust;

(2) adopting blast-furnace cinder and plant ash is antiseized auxiliary agent, and cost is low, economizes on resources;

(3), in casting process, do not produce pernicious gas poisonous, that have pollution, environmental protection;

(4) by the rational proportioning of each composition, make the molding sand quality of preparation excellent, the surface finish of casting that adopts this molding sand to produce is high.

The specific embodiment

Heavy wall steel part clay sand dry type coating, by the following component in weight portion, formed: silica flour 43-50 part, silica flour granularity is 80-100 order, boron coagulates native 6-8 part, rosin 5-8 part, bentonite 6-8 part, red sand 1-3 part, phenolic resins 2-5 part, alumine be who knows 4-6 part, water 10-12 part, concrete preparation method is, 1) by proportioning, weigh silica flour, the solidifying soil of boron, rosin, add the water of total amount 45-50% to put into together in edge runner, constantly to adding appropriate alcohol to make material reach suitable humidity in edge runner, be paste, the paste product obtaining from edge runner is heated to after 350 ℃ with 15 ℃/h, with 10 ℃/h, cool to room temperature again, finally carry out drying and processing, after oven dry, be ground into granular product, 2) by proportioning weigh that alumine be who knows, phenolic resins, red sand, put into together puddle mixer and be dry mixed, mix 2.5-3 hour, 3) in puddle mixer, add again step 1) product and bentonite, remaining water, mix after 3-4 hour, shake out.

The processing performance of the casting sand that contains blast-furnace cinder by the present invention is:

Green compression strength (MPa) 0.087-0.095

Gas permeability 99.6

Hot green tensile strength (KPa) 317-324

Shatter index (j :) 83-86%.

Claims

1. heavy wall steel part clay sand dry type coating, it is characterized in that, by the following component in weight portion, formed: silica flour 43-50 part, boron coagulates native 6-8 part, rosin 5-8 part, bentonite 6-8 part, red sand 1-3 part, phenolic resins 2-5 part, alumine be who knows 4-6 part, water 10-12 part, concrete preparation method is, 1) by proportioning, weigh silica flour, the solidifying soil of boron, rosin, add the water of total amount 45-50% to put into together in edge runner, constantly to adding appropriate alcohol to make material reach suitable humidity in edge runner, be paste, the paste product obtaining from edge runner is heated to after 350 ℃ with 15 ℃/h, with 10 ℃/h, cool to room temperature again, finally carry out drying and processing, after oven dry, be ground into granular product, 2) by proportioning weigh that alumine be who knows, phenolic resins, red sand, put into together puddle mixer and be dry mixed, mix 2.5-3 hour, 3) in puddle mixer, add again step 1) product and bentonite, remaining water, mix after 3-4 hour, shake out.

2. the casting sand that contains blast-furnace cinder claimed in claim 1, is characterized in that, described silica flour granularity is 80-100 order.