CN107377869A - A kind of sand mulling craft for improving clay green-sand combination property - Google Patents

A kind of sand mulling craft for improving clay green-sand combination property Download PDF

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Publication number
CN107377869A
CN107377869A CN201710650848.2A CN201710650848A CN107377869A CN 107377869 A CN107377869 A CN 107377869A CN 201710650848 A CN201710650848 A CN 201710650848A CN 107377869 A CN107377869 A CN 107377869A
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CN
China
Prior art keywords
sand
combination property
parts
green
bentonite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710650848.2A
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Chinese (zh)
Inventor
孙爱琴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HEFEI TENVER PRECISION CASTING CO Ltd
Original Assignee
HEFEI TENVER PRECISION CASTING CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HEFEI TENVER PRECISION CASTING CO Ltd filed Critical HEFEI TENVER PRECISION CASTING CO Ltd
Priority to CN201710650848.2A priority Critical patent/CN107377869A/en
Publication of CN107377869A publication Critical patent/CN107377869A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C5/00Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409Blending, mixing, kneading or stirring; Methods therefor

Abstract

The invention belongs to clay green-sand mulling technical field, and in particular to a kind of sand mulling craft for improving clay green-sand combination property, including herein below:Roughing sand, h-mordenite powder and magnesia addition water are mixed 34 minutes, then bentonite is added and coal dust is blended 45 minutes again.The present invention has advantages below compared with prior art:In the present invention wet mixing is carried out by adding h-mordenite powder and magnesia in roughing sand, h-mordenite powder is during wet mixing, with stronger activity, magnesia can be made to form cutose on molding sand surface, it can be made to be evenly distributed in sand grain surface when being mixed again with bentonite, be not easy to form clay group;The green compression strength of molding sand can also be increased in the case of coal dust usage amount in reducing molding sand.

Description

A kind of sand mulling craft for improving clay green-sand combination property
Technical field
The invention belongs to clay green-sand mulling technical field, and in particular to a kind of raising clay green-sand combination property Sand mulling craft.
Background technology
Clay green-sand is most important Modeling Material, applied widely, consumption is big, is producing automobile zero in enormous quantities Still there is the office do not replaced in part, small diesel engine part etc. during widget to advantage, good molding sand is that acquisition low cost is excellent The important guarantee of matter casting, the defects of reducing casting, improve the surface quality and precision of casting, it is desirable to which molding sand has good make Type performance, suitable intensity, highly-breathable, low gas-forming property and molding sand uniformity and uniformity;Existing molding sand is by clay, original What sand, additives and water formed, make each component uniform by being blended, and uniform clay mambrane is formed in grit surface, make molding sand With certain performance, and in mulling, the difference of mulling raw material, the difference of charging sequence Bu Tong can shadows with incorporation time Moulding-sand property is rung, traditional sand mulling craft is that first siccative is added in puddle mixer dry-mixed 2 minutes, then adds water wet mixing 8 minutes, and It is as caused by molding sand, in the prior art to clay green-sand raw material and preparation technology that the waste product of clay-bonded sand casting, which has 50%, Constantly improve, but still need further research and inquirement.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of mulling work for improving clay green-sand combination property Skill.
The present invention is achieved by the following technical solutions:A kind of sand mulling craft for improving clay green-sand combination property, Including herein below:By roughing sand, h-mordenite powder and magnesia add water mixing 3-4 minutes, then add bentonite with Coal dust is blended 4-5 minutes again;Wherein amount of water makes sand compaction be 45%;Wherein Na in h-mordenite powder2O's Content is less than 100ppm, and aperture is 6.7 × 7.0 × 10-10M, specific surface area 510M2/G.
As further improvement of these options, each raw material of molding sand includes 100 parts of roughing sand, mercerising by weight Zeolite powder 2.5-3.2 parts, magnesia 0.85-1.25 parts, bentonite 4.2-4.8 parts, coal dust 3.6-4.2 parts.
As further improvement of these options, the bentonite is calcium-base bentonite.
As further improvement of these options, SiO in the h-mordenite powder2/Al2O3Ratio be 21.5, Water content is 15.2%wt during absorption equilibrium.
As further improvement of these options, the molding sand is blended using SHN simpson mills.
The present invention has advantages below compared with prior art:By adding h-mordenite powder in roughing sand in the present invention Wet mixing is carried out with magnesia, h-mordenite powder has stronger activity, can make magnesia in molding sand table during wet mixing Face forms cutose, then it can be made to be evenly distributed in sand grain surface when being mixed with bentonite, is not easy to form clay group;Can also Increase the green compression strength of molding sand in the case of coal dust usage amount in reducing molding sand.
Embodiment
Embodiment 1
A kind of sand mulling craft for improving clay green-sand combination property, including herein below:By roughing sand, h-mordenite powder and Magnesia adds water and mixed 3.5 minutes, then adds bentonite and coal dust is blended 4.5 minutes again;Wherein amount of water makes type The sand degree of packing is 45%;Wherein Na in h-mordenite powder2O content is less than 100ppm, and aperture is 6.7 × 7.0 × 10-10M, Specific surface area is 510M2/G;
Wherein, each raw material of the molding sand includes 100 parts of roughing sand, 2.8 parts of modenite powder, 1 part of magnesia, swelling by weight Native 4.5 parts, 4 parts of coal dust.
Wherein, the bentonite is calcium-base bentonite;SiO in the h-mordenite powder2/Al2O3Ratio be 21.5, water content is 15.2%wt during absorption equilibrium;The molding sand is blended using SHN simpson mills.
Embodiment 2
A kind of sand mulling craft for improving clay green-sand combination property, including herein below:By roughing sand, h-mordenite powder and Magnesia adds water and mixed 4 minutes, then adds bentonite and coal dust is blended 4 minutes again;Wherein amount of water makes molding sand tight Solidity is 45%;Wherein Na in h-mordenite powder2O content is less than 100ppm, and aperture is 6.7 × 7.0 × 10-10M, compare table Area is 510M2/G;
Wherein, each raw material of the molding sand by weight include 100 parts of roughing sand, 2.5 parts of modenite powder, 1.25 parts of magnesia, 4.8 parts of bentonite, 3.6 parts of coal dust.
Embodiment 3
A kind of sand mulling craft for improving clay green-sand combination property, including herein below:By roughing sand, h-mordenite powder and Magnesia adds water and mixed 3 minutes, then adds bentonite and coal dust is blended 5 minutes again;Wherein amount of water makes molding sand tight Solidity is 45%;Wherein Na in h-mordenite powder2O content is less than 100ppm, and aperture is 6.7 × 7.0 × 10-10M, compare table Area is 510M2/G;
Wherein, each raw material of the molding sand by weight include 100 parts of roughing sand, 3.2 parts of modenite powder, 0.85 part of magnesia, 4.2 parts of bentonite, 4.2 parts of coal dust.
Control group 1 is set, h-mordenite powder in embodiment 1 removed, remaining content is constant;Control group 2 is set, will Magnesia removes in embodiment 1, and remaining content is constant;Control group 3 is set, h-mordenite powder in embodiment 1 is replaced with Sodium form modenite powder, remaining content are constant;Control group 4 is set, is existing improved technology, is chosen in particular from《Sand mulling craft is to viscous The influence of native wet sand performance》, specifically, the formula of molding sand is:100 parts of roughing sand, 6 parts of bentonite, 5 parts of coal dust, water is added to Compact rate of molding is 45%;Sand mulling craft is:Roughing sand adds bentonite after being mixed 5 minutes with water and coal dust is blended 8 minutes and completed again;
Each group gas permeability, green compression strength, shatter index and hot-drawn intensity are detected, obtain following result:
Table 1
Group Gas permeability Green compression strength(kg/cm³) Shatter index(%) Hot green tensile strength(g/cm³)
Embodiment 1 98.4 1.73 87.8 13.4
Embodiment 2 98.2 1.75 87.2 13.6
Embodiment 3 98.5 1.74 87.5 13.6
Control group 1 90.3 1.46 84.2 11.5
Control group 2 87.2 1.28 81.6 10.8
Control group 3 95.8 1.64 85.7 12.6
Control group 4 92.6 1.59 85.1 10.4
Can be seen that method in the present invention by data in table 1, Sand combination property significantly improves compared with prior art, if Feed change adds or sand mulling craft can influence its performance, and in embodiment 1-3 the mulling time compare and shorten in control group 4, Productivity ratio can be improved.

Claims (5)

1. a kind of sand mulling craft for improving clay green-sand combination property, it is characterised in that including herein below:By roughing sand, hydrogen Type modenite powder and magnesia add water mixing 3-4 minutes, then add bentonite and coal dust is blended 4-5 minutes again; Wherein amount of water makes sand compaction be 45%;Wherein Na in h-mordenite powder2O content is less than 100ppm, and aperture is 6.7×7.0×10-10M, specific surface area 510M2/G.
A kind of 2. sand mulling craft for improving clay green-sand combination property as claimed in claim 1, it is characterised in that the molding sand Each raw material includes 100 parts of roughing sand, modenite powder 2.5-3.2 parts, magnesia 0.85-1.25 parts, bentonite by weight 4.2-4.8 part, coal dust 3.6-4.2 parts.
A kind of 3. sand mulling craft for improving clay green-sand combination property as claimed in claim 1, it is characterised in that the swelling Soil is calcium-base bentonite.
A kind of 4. sand mulling craft for improving clay green-sand combination property as claimed in claim 1, it is characterised in that the Hydrogen SiO in modenite powder2/Al2O3Ratio be 21.5, water content is 15.2%wt during absorption equilibrium.
A kind of 5. sand mulling craft for improving clay green-sand combination property as claimed in claim 1, it is characterised in that the molding sand It is blended using SHN simpson mills.
CN201710650848.2A 2017-08-02 2017-08-02 A kind of sand mulling craft for improving clay green-sand combination property Pending CN107377869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710650848.2A CN107377869A (en) 2017-08-02 2017-08-02 A kind of sand mulling craft for improving clay green-sand combination property

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710650848.2A CN107377869A (en) 2017-08-02 2017-08-02 A kind of sand mulling craft for improving clay green-sand combination property

Publications (1)

Publication Number Publication Date
CN107377869A true CN107377869A (en) 2017-11-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710650848.2A Pending CN107377869A (en) 2017-08-02 2017-08-02 A kind of sand mulling craft for improving clay green-sand combination property

Country Status (1)

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CN (1) CN107377869A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270990A (en) * 1999-04-16 2000-10-25 中国石油化工集团公司 Light hydrocarbon isomerizing catalyst and its preparation
CN1328114A (en) * 2000-06-13 2001-12-26 大庆石油学院 Catalyst for isomerizing light hydrocarbon and its preparing process
CN1351904A (en) * 2000-11-15 2002-06-05 北京燕山石油化工公司研究院 Zeolite catalyst and process for preparing 4-tert butyl catechol
CN101733361A (en) * 2010-01-06 2010-06-16 东华大学 Sand burning preventing coal dust free green sand for casting and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270990A (en) * 1999-04-16 2000-10-25 中国石油化工集团公司 Light hydrocarbon isomerizing catalyst and its preparation
CN1328114A (en) * 2000-06-13 2001-12-26 大庆石油学院 Catalyst for isomerizing light hydrocarbon and its preparing process
CN1351904A (en) * 2000-11-15 2002-06-05 北京燕山石油化工公司研究院 Zeolite catalyst and process for preparing 4-tert butyl catechol
CN101733361A (en) * 2010-01-06 2010-06-16 东华大学 Sand burning preventing coal dust free green sand for casting and preparation method thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
刘瑞玲等: "混砂工艺对粘土湿型砂性能的影响", 《河北科技大学学报》 *
周峰等: "高硅丝光沸石的合成方法", 《世界有色金属》 *
济南铸造锻压机械研究所: "《铸造生产》", 31 December 1977, 机械工业出版社 *

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Application publication date: 20171124