WO2017114075A1 - High strength casting method - Google Patents

High strength casting method Download PDF

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Publication number
WO2017114075A1
WO2017114075A1 PCT/CN2016/107874 CN2016107874W WO2017114075A1 WO 2017114075 A1 WO2017114075 A1 WO 2017114075A1 CN 2016107874 W CN2016107874 W CN 2016107874W WO 2017114075 A1 WO2017114075 A1 WO 2017114075A1
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sand
parts
functional component
mesh
particle size
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PCT/CN2016/107874
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French (fr)
Chinese (zh)
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张建勋
侯晓翠
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张建勋
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Publication of WO2017114075A1 publication Critical patent/WO2017114075A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents

Definitions

  • the invention belongs to the field of casting technology, and in particular relates to a high strength casting molding sand.
  • modeling materials In the field of casting, in a broad sense, all materials used to make molds (including sand cores, paints, etc.) are collectively referred to as modeling materials.
  • the molds used in foundry production are sand type, metal type, ceramic type, gypsum type, graphite type, etc.
  • the most common and widely used type is sand type.
  • the castings produced by sand type account for various casting production castings. 60%-80% of the output, the 21st century calls for "green casting", protecting the environment and achieving sustainable development is our basic national policy.
  • the modeling materials play an important role in the environmental protection, green and clean production of the foundry. In the production of casting and lost foam casting, a large amount of discarded old sand will be discharged. If it cannot be recycled and reused, it will inevitably cause great pollution damage to the natural environment, thus developing a high-strength, environmentally friendly and less polluted. Modeling materials have important implications for the current state of the art.
  • the present invention discloses a high-strength casting sand, which can efficiently obtain a high-strength foundry sand type, and uses environmentally friendly materials to protect the environment and resources.
  • High-strength casting sand comprising raw sand, first functional component, second functional component, binder;
  • the raw sand includes new sand and reclaimed sand, and the mass ratio of the new sand and the reclaimed sand is (65-80): (35-20);
  • the new sand comprises 100-110 parts by weight of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, 5-7 parts of corundum sand, 3-5 parts of refractory clinker, carbonaceous sand 3 -5 servings;
  • the refractory clinker is a mixture of bauxite and coal gangue having a mass ratio of 2:1, wherein the bauxite has an alumina content of 75% and a refractoriness of more than 1850 degrees.
  • the carbonaceous sand is graphite or coke, and the particle size is 160-200 mesh.
  • the reclaimed sand has a particle size of 180-240 mesh.
  • the first functional component is a combustible material containing carbon fibers.
  • the second functional component is one or two of diatomaceous earth or attapulgite, and the particle size is 80-120 mesh, which accounts for 3-5% of the total mass of the original sand.
  • the binder is a mixture of phenolic resin, vegetable oil, tower oil, polyvinyl alcohol, and the volume ratio is (60-65): (4-6): (2: -3): (10-15).
  • the combustible material containing carbon fibers is fine wood chips and crop straws, the fine wood chips have a particle size of 160-200 mesh, and the crop straw fibers have a diameter of 4-6 mm.
  • the invention adopts a suitable content of silica sand as the main component of the original sand, reduces the production cost, and adopts zircon sand and olivine sand with small particle diameter, has small expansion coefficient, improves structural stability and good thermal conductivity.
  • the refractory degree is high, and the olivine sand also improves the acid and alkali resistance of the molding sand, the refractory clinker is loose, the refractoriness is improved, and the sand falling treatment is convenient, the reclaimed sand is used, the environmental protection is reused, and the fine-grained reclaimed sand has It is beneficial to improve the quality of the mold, and at the same time, using porous materials such as diatomaceous earth or attapulgite as the sand material, reducing the amount of refractory used and making the mold lighter, which is beneficial to environmental protection and adopts a reasonable ratio. Under the premise of ensuring the strength of the sand, the gas permeability is increased, the porosity defects of the casting are reduced, and the yield is increased.
  • High-strength casting sand comprising raw sand, first functional component, second functional component, binder;
  • the raw sand includes new sand and reclaimed sand, and the mass ratio of the new sand and the reclaimed sand is (65-80): (35-20);
  • the new sand comprises 100-110 parts by weight of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, 5-7 parts of corundum sand, 3-5 parts of refractory clinker, carbonaceous sand 3 -5 servings;
  • the silica sand has a silica content of 90%-95%, an alumina of less than 5%, a balance of unavoidable impurities, a particle size of 140-180 mesh, a compact density of 1.75 g/cm3 or more, and an average fineness. For 52-55;
  • the zirconium sand has a zirconia content of more than 70%, a silica content of less than 28%, a titanium oxide content of less than 0.3%, an iron oxide content of less than 0.12%, an alumina content of less than 0.2%, and a particle size of 240-280 meshes;
  • the olivine sand has a magnesium oxide content of 48-55%, a silica content of less than 45%, an iron oxide content of less than 8%, and a particle size of 240-280 mesh.
  • the corundum sand has an alumina content of 99-99.5% and a particle size of 140-180 mesh;
  • the refractory clinker is a mixture of bauxite and coal gangue having a mass ratio of 2:1, wherein the bauxite has an alumina content of 75% and a refractoriness of more than 1850 ° C.
  • the carbonaceous sand is graphite or coke, and the particle size is 160-200 mesh.
  • the reclaimed sand has a particle size of 180-240 mesh.
  • the first functional component is a combustible material containing carbon fibers, fine wood chips, crop straws, fine wood chips having a particle size of 160-200 mesh, and crop straw fibers having a diameter of 4-6 mm;
  • the second functional component is one or two of diatomaceous earth or attapulgite, and the particle size is 80-120 mesh, which accounts for 3-5% of the total mass of the original sand.
  • the binder is a mixture of phenolic resin, vegetable oil, tower oil, polyvinyl alcohol, and the volume ratio is (60-65): (4-6): (2: -3): (10-15).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

A high strength casting method, comprising raw sand, a functional component, and a binder, the raw sand comprising new sand and recycled sand, and the new sand comprising, in parts by weight, 100-110 parts of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, 5-7 parts of corundum sand, 3-5 parts of refractory clinker, and 3-5 parts of carbonaceous sand; the functional component is a combustible material containing carbon fibre, and the binder is a mixture of phenolic resin, vegetable oil, tower oil, and polyvinyl alcohol; production costs are low, structural stability is improved, heat conductivity is good, and fire resistance and acid and alkali resistance are high; breathability is increased whilst ensuring moulding sand strength, casting pore defects are reduced, and the yield of finished products is increased.

Description

一种高强度铸造型砂High-strength casting sand 技术领域Technical field
本发明属于铸造技术领域，尤其是涉及一种高强度铸造型砂。The invention belongs to the field of casting technology, and in particular relates to a high strength casting molding sand.
背景技术Background technique
在铸造领域，从广义上讲，凡是用来制造铸型(包括砂芯、涂料等)的材料统称为造型材料。铸造生产中使用的铸型有砂型、金属型、陶瓷型、石膏型、石墨型等，其中最普遍和大量使用的是砂型，在世界范围内，应用砂型生产的铸件占各种铸型生产铸件产量的60％-80％，21世纪呼唤“绿色铸造”，保护环境、实现可持续发展是我们的基本国策，造型材料对铸造厂的环保、绿色、清洁化生产起到重要的作用，在砂型铸造和消失模铸造生产中，将排放大量废弃的旧砂，如果不能进行再生处理和再利用，必定对自然环境带来巨大的污染的破坏，因此开发出一种高强度、环保、少污染的造型材料对于目前现状，有着重要的意义。In the field of casting, in a broad sense, all materials used to make molds (including sand cores, paints, etc.) are collectively referred to as modeling materials. The molds used in foundry production are sand type, metal type, ceramic type, gypsum type, graphite type, etc. The most common and widely used type is sand type. In the world, the castings produced by sand type account for various casting production castings. 60%-80% of the output, the 21st century calls for "green casting", protecting the environment and achieving sustainable development is our basic national policy. The modeling materials play an important role in the environmental protection, green and clean production of the foundry. In the production of casting and lost foam casting, a large amount of discarded old sand will be discharged. If it cannot be recycled and reused, it will inevitably cause great pollution damage to the natural environment, thus developing a high-strength, environmentally friendly and less polluted. Modeling materials have important implications for the current state of the art.
发明内容Summary of the invention
基于以上技术问题，本发明公开了一种高强度铸造型砂，可以高效的得到高强度铸造砂型，并且采用环保材料，保护了环境与资源。Based on the above technical problems, the present invention discloses a high-strength casting sand, which can efficiently obtain a high-strength foundry sand type, and uses environmentally friendly materials to protect the environment and resources.
本发明完整的技术方案包括：The complete technical solution of the present invention includes:
一种高强度铸造型砂，包括原砂，第一功能组分，第二功能组分，粘结剂；High-strength casting sand, comprising raw sand, first functional component, second functional component, binder;
所述的原砂包括新砂和再生砂，所述的新砂和再生砂质量比为(65-80)：(35-20)；The raw sand includes new sand and reclaimed sand, and the mass ratio of the new sand and the reclaimed sand is (65-80): (35-20);
所述的新砂按重量份计包括硅砂100-110份，锆砂6-10份，镁橄榄石砂10-15份，刚玉砂5-7份，耐火熟料3-5份，碳质砂3-5份；The new sand comprises 100-110 parts by weight of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, 5-7 parts of corundum sand, 3-5 parts of refractory clinker, carbonaceous sand 3 -5 servings;
所述的耐火熟料为质量比为2:1的铝矾土和煤矸石混合物，其中铝矾土中氧化铝含量为75％，耐火度大于1850度，The refractory clinker is a mixture of bauxite and coal gangue having a mass ratio of 2:1, wherein the bauxite has an alumina content of 75% and a refractoriness of more than 1850 degrees.
所述的碳质砂为石墨或焦炭、粒度为160-200目，The carbonaceous sand is graphite or coke, and the particle size is 160-200 mesh.
所述的再生砂粒度为180-240目。The reclaimed sand has a particle size of 180-240 mesh.
所述的第一功能组分为含有碳纤维的可燃物质，The first functional component is a combustible material containing carbon fibers.
所述的第二功能组分硅藻土或凹凸棒土的一至两种，粒度为80-120目，其占原砂总质量的3-5％， The second functional component is one or two of diatomaceous earth or attapulgite, and the particle size is 80-120 mesh, which accounts for 3-5% of the total mass of the original sand.
所述的粘结剂为酚醛树脂、植物油、塔油、聚乙烯醇的混合物，体积比为(60-65)：(4-6)：(2:-3)：(10-15)。The binder is a mixture of phenolic resin, vegetable oil, tower oil, polyvinyl alcohol, and the volume ratio is (60-65): (4-6): (2: -3): (10-15).
所述的含有碳纤维的可燃物质为细木屑和农作物秸秆，细木屑粒度为160-200目，农作物秸秆纤维直径为4-6mm。The combustible material containing carbon fibers is fine wood chips and crop straws, the fine wood chips have a particle size of 160-200 mesh, and the crop straw fibers have a diameter of 4-6 mm.
本发明相对现有技术，采用合适含量的硅砂作为原砂主成分，降低了生产成本，并采用粒径小的锆砂和橄榄石砂，膨胀系数小，提高了结构稳定性，导热性好，耐火度高，并且橄榄石砂还提高了型砂的抗酸碱性，耐火熟料松散，提高了耐火度，并且便于落砂处理，采用再生砂，利于环保再利用，并且细颗粒的再生砂有利于提高铸型质量，同时采用硅藻土或凹凸棒土等多孔材料作为型砂材料，降低了耐火材料的使用量，使铸型轻质化，既有利于环保，并采用合理的配比，在保证型砂强度的前提下增加了透气性，降低了铸件气孔缺陷，增加了成品率。Compared with the prior art, the invention adopts a suitable content of silica sand as the main component of the original sand, reduces the production cost, and adopts zircon sand and olivine sand with small particle diameter, has small expansion coefficient, improves structural stability and good thermal conductivity. The refractory degree is high, and the olivine sand also improves the acid and alkali resistance of the molding sand, the refractory clinker is loose, the refractoriness is improved, and the sand falling treatment is convenient, the reclaimed sand is used, the environmental protection is reused, and the fine-grained reclaimed sand has It is beneficial to improve the quality of the mold, and at the same time, using porous materials such as diatomaceous earth or attapulgite as the sand material, reducing the amount of refractory used and making the mold lighter, which is beneficial to environmental protection and adopts a reasonable ratio. Under the premise of ensuring the strength of the sand, the gas permeability is increased, the porosity defects of the casting are reduced, and the yield is increased.
具体实施方式detailed description
下面结合具体实施方式对本发明做进一步说明。The present invention will be further described below in conjunction with specific embodiments.
一种高强度铸造型砂，包括原砂，第一功能组分，第二功能组分，粘结剂；High-strength casting sand, comprising raw sand, first functional component, second functional component, binder;
所述的原砂包括新砂和再生砂，所述的新砂和再生砂质量比为(65-80)：(35-20)；The raw sand includes new sand and reclaimed sand, and the mass ratio of the new sand and the reclaimed sand is (65-80): (35-20);
所述的新砂按重量份计包括硅砂100-110份，锆砂6-10份，镁橄榄石砂10-15份，刚玉砂5-7份，耐火熟料3-5份，碳质砂3-5份；The new sand comprises 100-110 parts by weight of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, 5-7 parts of corundum sand, 3-5 parts of refractory clinker, carbonaceous sand 3 -5 servings;
所述的硅砂中二氧化硅含量为90％-95％，氧化铝小于5％，余量为不可避免的杂质，粒度为140-180目，紧实密度为1.75g/cm3以上，平均细度为52-55；The silica sand has a silica content of 90%-95%, an alumina of less than 5%, a balance of unavoidable impurities, a particle size of 140-180 mesh, a compact density of 1.75 g/cm3 or more, and an average fineness. For 52-55;
锆砂中氧化锆含量大于70％，氧化硅含量小于28％，氧化钛含量小于0.3％，氧化铁含量小于0.12％，氧化铝含量小于0.2％，粒度为240-280目；The zirconium sand has a zirconia content of more than 70%, a silica content of less than 28%, a titanium oxide content of less than 0.3%, an iron oxide content of less than 0.12%, an alumina content of less than 0.2%, and a particle size of 240-280 meshes;
所述的橄榄石砂中氧化镁含量为48-55％，氧化硅含量小于45％，氧化铁含量小于8％，粒度为240-280目，The olivine sand has a magnesium oxide content of 48-55%, a silica content of less than 45%, an iron oxide content of less than 8%, and a particle size of 240-280 mesh.
所述的刚玉砂中氧化铝含量为99-99.5％，粒度为140-180目；The corundum sand has an alumina content of 99-99.5% and a particle size of 140-180 mesh;
所述的耐火熟料为质量比为2:1的铝矾土和煤矸石混合物，其中铝矾土中氧化铝含量为75％，耐火度大于1850℃，The refractory clinker is a mixture of bauxite and coal gangue having a mass ratio of 2:1, wherein the bauxite has an alumina content of 75% and a refractoriness of more than 1850 ° C.
所述的碳质砂为石墨或焦炭、粒度为160-200目， The carbonaceous sand is graphite or coke, and the particle size is 160-200 mesh.
所述的再生砂粒度为180-240目。The reclaimed sand has a particle size of 180-240 mesh.
所述的第一功能组分为含有碳纤维的可燃物质，细木屑、农作物秸秆，细木屑粒度为160-200目，农作物秸秆纤维直径为4-6mm；The first functional component is a combustible material containing carbon fibers, fine wood chips, crop straws, fine wood chips having a particle size of 160-200 mesh, and crop straw fibers having a diameter of 4-6 mm;
所述的第二功能组分硅藻土或凹凸棒土的一至两种，粒度为80-120目，其占原砂总质量的3-5％，The second functional component is one or two of diatomaceous earth or attapulgite, and the particle size is 80-120 mesh, which accounts for 3-5% of the total mass of the original sand.
所述的粘结剂为酚醛树脂、植物油、塔油、聚乙烯醇的混合物，体积比为(60-65)：(4-6)：(2:-3)：(10-15)。 The binder is a mixture of phenolic resin, vegetable oil, tower oil, polyvinyl alcohol, and the volume ratio is (60-65): (4-6): (2: -3): (10-15).

Claims (2)

  1. 一种高强度铸造型砂，包括原砂，第一功能组分，第二功能组分，粘结剂；High-strength casting sand, comprising raw sand, first functional component, second functional component, binder;
    所述的原砂包括新砂和再生砂，所述的新砂和再生砂质量比为(65-80)：(35-20)；The raw sand includes new sand and reclaimed sand, and the mass ratio of the new sand and the reclaimed sand is (65-80): (35-20);
    所述的新砂按重量份计包括硅砂100-110份，锆砂6-10份，镁橄榄石砂10-15份，刚玉砂5-7份，耐火熟料3-5份，碳质砂3-5份；The new sand comprises 100-110 parts by weight of silica sand, 6-10 parts of zircon sand, 10-15 parts of forsterite sand, 5-7 parts of corundum sand, 3-5 parts of refractory clinker, carbonaceous sand 3 -5 servings;
    所述的耐火熟料为质量比为2:1的铝矾土和煤矸石混合物，其中铝矾土中氧化铝含量为75％，耐火度大于1850度，The refractory clinker is a mixture of bauxite and coal gangue having a mass ratio of 2:1, wherein the bauxite has an alumina content of 75% and a refractoriness of more than 1850 degrees.
    所述的碳质砂为石墨或焦炭、粒度为160-200目，The carbonaceous sand is graphite or coke, and the particle size is 160-200 mesh.
    所述的再生砂粒度为180-240目。The reclaimed sand has a particle size of 180-240 mesh.
    所述的第一功能组分为含有碳纤维的可燃物质，The first functional component is a combustible material containing carbon fibers.
    所述的第二功能组分硅藻土或凹凸棒土的一至两种，粒度为80-120目，其占原砂总质量的3-5％，The second functional component is one or two of diatomaceous earth or attapulgite, and the particle size is 80-120 mesh, which accounts for 3-5% of the total mass of the original sand.
    所述的粘结剂为酚醛树脂、植物油、塔油、聚乙烯醇的混合物，体积比为(60-65)：(4-6)：(2:-3)：(10-15)。The binder is a mixture of phenolic resin, vegetable oil, tower oil, polyvinyl alcohol, and the volume ratio is (60-65): (4-6): (2: -3): (10-15).
  2. 如权利要求1所述的型砂，其特征在于，所述的含有碳纤维的可燃物质为细木屑和农作物秸秆，细木屑粒度为160-200目，农作物秸秆纤维直径为4-6mm。 The molding sand according to claim 1, wherein said combustible material containing carbon fibers is fine wood chips and crop straw, and the fine wood chips have a particle size of 160-200 mesh, and the crop straw fibers have a diameter of 4-6 mm.
PCT/CN2016/107874 2015-12-30 2016-11-30 High strength casting method WO2017114075A1 (en)

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