CN100453205C - Method for hardening sand mold by CO2 blowing - Google Patents
Method for hardening sand mold by CO2 blowing Download PDFInfo
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- CN100453205C CN100453205C CNB2005100274784A CN200510027478A CN100453205C CN 100453205 C CN100453205 C CN 100453205C CN B2005100274784 A CNB2005100274784 A CN B2005100274784A CN 200510027478 A CN200510027478 A CN 200510027478A CN 100453205 C CN100453205 C CN 100453205C
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- sand
- mold
- sand mold
- sandbox
- gas
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Abstract
The present invention relates to a method for hardening a casting sand mold by blowing CO2. A certain number of positioning holes with certain sizes are arranged on one side wall of a sand box or a sand frame according to the requirements. When a sand mold is manufactured, round rods with corresponding diameters and quantities as the required gas blowing holes are inserted into the holes on the side wall of the sand box according to different shapes of casting molds and transversely go across the top of a casting mold to a place adjacent to the other side wall of the sand box. On the basis of maintaining a certain sand layer thickness between the round rods and the surface of the casting mold and a certain distance between the top ends of the round rods and the other side face of the sand box, molding sand is poured, rammed and positioned, and after molding, the round rods are drawn out to form the gas blowing holes. After a flat plate is covered on the top surface of the sand box, the CO2 gas is blown into the gas blowing holes through the positioning holes until the sand mold is hardened. The method of the present invention can satisfy the variation requirements of mold cavities of casting molds with various shapes. The manufactured sand mold has the advantages of good quality, uniform hardening, convenient unmolding, convenient handling and operation, etc.
Description
Technical field
The present invention relates to a kind of casting sand type air blowing hardening process, especially a kind of CO
2The method of air blowing sclerosis casting sand type.
Background technology
Sand casting is commonly called as " founding ", is a kind of casting method with the sand mold moulding.Its workflow is: 1. make mold, promptly make and the essentially identical mold of foundry goods profile in kind with timber or metal; 2. manufacturing sand mold is about to mold and is placed in sandbox or the sand frame, fills molding sand and with molding sand real, the setting of pounding, and stays cavity after taking out mold in sand, just becomes sand mold; 3. cast is about to molten metal liquid and pours in the sand mold; 4. knockout and cleaning promptly treated to take out from sand mold after the metal condensation.Making sand mold is wherein important and the key link.In order to make sand mold scleroma, indeformable, general sand mold adopts the method for compacting, oven dry; And in order to ensure the quality of sand mold and the operating efficiency of raising manufacturing sand mold, the method that people extensively adopt the moulding of waterglass quartz sand to blow and harden in conjunction with CO2.
CO commonly used at present
2The air blowing method has housing method and pore air blast.
The housing method is promptly made the housing that has air admission hole with plank or metallic plate, is buckled on the sandbox that molding sand is real by pounding, the surface has been calibrated, blows CO
2Gas, order about sand mold sclerosis.Be characterized in simple, easy to operate, the easy row of operation.Its shortcoming is the inhomogeneous and CO of sand mold sclerosis
2Gas loss is more.Because the CO that enters
2Gas mainly fills in the space that is stored between sandbox table plane and housing, relies on gas to penetrate into sand mold inside, makes the molding sand on the sandbox table plane at first, also fully contact CO
2Gas, rapid hardening then is difficult for sclerosis near near the molding sand the mould surface, thereby causes that the molding sand sclerosis is inhomogeneous, sand mold intensity is lower.
The pore air blast comprises in intubation and the type two kinds of air blasts.
Intubation is after filling moulding according to a conventional method, wipes plane on the sandbox off, and some φ 6mm left and right sides pore is pricked to the mold direction in the plane from the sand mold, and its quantity, the degree of depth and position are decided by casting die structure.Then, insert the metal gas blow pipe that has aperture successively, feed CO
2Gas hardens to sand mold.It is one of present most widely used air blowing method that intubate is blown, and its advantage is that multitube distributes, inserts the inner air blowing of sand mold as required, can make the sand mold sclerosis evenly.But because gas hole is pricked after back-up sand, so difficult accurately location in the degree of depth of gas hole and position, being easy to generate error cause gas hole prick deeply, near excessively with the apperance surface spacing, the relevant layer of sand of locating of sand mold is thin excessively to making, and causes generation runout situation when sand mold is poured into a mould.
Air blast is by gas hole is set on mold in the type, makes CO
2Gas reacts and hardening sand mold on the interface of apperance and sand mold.Its advantage is that the mold cavity surface of sand mold can obtain sclerosis fast; but because a plurality of gas holes must be set on the mold matrix; except that influencing the mould surface integrality; control to the air blowing degree is had relatively high expectations; just in case may influence the surface quality of die cavity when the over-blowing situation takes place; and because of being difficult for sclerosis, so still there is the uneven problem of the whole sclerosis of sand mold away from plane on the sand mold of mold cavity surface.
Summary of the invention
The purpose of this invention is to provide a kind of can effectively overcome existing make the technologic deficiency of sand mold, can make the whole sclerosis of sand mold efficient high and evenly, CO
2Gas usage is few, can the improper CO that the runout phenomenon takes place be set because of gas hole during cast
2The method of air blowing hardening sand mold.
The present invention is achieved in that on a sidewall of sandbox or sand frame, and the locating hole of a certain size and some is set as required; When making sand mold, difformity according to mold, on the basis of guaranteeing the certain sand layer thickness of maintenance between pole and mould surface, in this sidewall positioning hole corresponding of sandbox, insert the pole that conforms to required gas hole diameter, pole laterally strides across the mold top near another sidewall of sandbox, and pole is located; Then, pour molding sand into and the reality of being pounded, after moulding finishes, extract pole out, form gas hole; Cover dull and stereotyped back at the sandbox end face and in gas hole, blow CO by locating hole
2Gas hardens until sand mold.
Based on above-mentioned design, the CO in the inventive method
2The air-flow trend is parallel to the mold base plate, but not prior art perpendicular to the mold base plate, can adjust the position of gas hole simultaneously according to the true form of mold, control the sand layer thickness between gas hole and mould surface quantitatively, guarantee that the sand mold after the sclerosis can have washing away of enough intensity bearing certain pressure molten metals, can effectively avoid the generation of under various pouring conditions sand mold drop or molten metal runout situation.And, be before filling moulding owing to place pole at the sandbox sidewall, so just can control the distance between gas hole and the mould surface intuitively according to the inventive method; And be after moulding, to prick pore again unlike intubation of the prior art, must be by estimating to control the distance between gas hole and the mould surface; Therefore, also because of causing gas hole, operate miss crosses closely or problem far away excessively apart from mold with regard to having avoided.In addition, method of the present invention also helps and reduces CO
2Consumption, improve the sclerosis efficient of sand mold, effectively overcome in the housing method die cavity surface type sand owe hard and the interior air blast of type on the sand mold plane owe hard defective, has easy to operate, sclerosis evenly, be convenient in demoulding and be convenient to plurality of advantages such as carrying operation etc., can adapt to the variation requirement of various mold shape die cavities.
Description of drawings
Fig. 1 utilizes method of the present invention to make the operation chart of sand mold;
Fig. 2 utilizes gas hole distribution schematic diagram on the sandbox sidewall of the inventive method.
Among the figure:
1. sandbox 2. molds 3. molding sand 4. locating holes
5. sidewall 6. poles 7. pole tops 8. another sidewalls
9. go up plane 10. sand molds, 11. gas holes, 12. flat boards
13. horizontal spacing 14. longitudinal pitches
The specific embodiment
Below in conjunction with drawings and the specific embodiments the inventive method is further described.
In Fig. 1 and Fig. 2, utilize CO of the present invention
2When the method for air blowing hardening sand mold is made sand mold, mold 2 is set in sandbox 1 at first; Be provided with at sandbox 1 then and insert some poles 6 on the sidewall 5 of locating hole 4 in some positioning hole corresponding 4, make the certain vertical range of maintenance between pole 6 and mold 2 surfaces, laterally cross over mold 2 tops, make between another sidewall 8 of pole top 7 and sandbox and maintain a certain distance, to guarantee the sand layer thickness at this place, and pour part molding sand 3 into, locate in pole 6 downside back-up sands; Then according to a conventional method filling moulding, pound real after, wipe plane 9 on the sandbox off, extract pole 6 successively out, form gas hole 11 this moment sand mold 10 in, at sandbox 1 loam cake flat board 12, by locating hole 4 feeding CO in gas hole 11 successively
2Gas is to sand mold 10 sclerosis.
In the present invention, the diameter of the locating hole 4 on sandbox 1 sidewall 5 can be controlled between the 6mm-10mm, and the horizontal spacing 13 between adjacent two locating holes can be controlled between the 100mm-200mm, longitudinal pitch 14 can be controlled between the 0-100mm.Adopt this sandbox 1, can adapt to the variation requirement of the mold 2 of different shape, make gas hole 11 the position is set and quantity can guarantee hardening sand mold 10 effectively, and guarantee specified sand layer thickness between gas hole 11 and the mold 2, can not take place to influence because of sand layer thickness between gas hole 11 and the mold 2 is too thin sand mold 10 intensity, cause the situation of casting flaw even runout.Gas hole 11 axially and the sand layer thickness between mold 2 surfaces should be less than 30mm, the distance that gas hole 11 tops 7 and sandbox 1 another sidewall are 8 should be less than 10mm.
Claims (3)
1. CO
2The method of air blowing hardening sand mold is characterized in that: by on a sidewall (5) of sandbox (1) locating hole (4) being set as required; When making sand mold, difformity according to mold (2), on the basis of guaranteeing the certain sand layer thickness of maintenance between pole (6) and mold (2) surface, in this sidewall (5) positioning hole corresponding (4) of sandbox, insert the pole (6) that conforms to required gas hole (11) diameter, pole (6) laterally strides across mold (2) top near another sidewall of sandbox (1) (8), and pole is located; Then, pour molding sand (3) into, and the reality of being pounded, after moulding finishes, extract pole (6) out, form gas hole (11); Cover flat board (12) back at sandbox (1) end face and in gas hole (11), blow CO by locating hole (4)
2Gas hardens until sand mold (10).
2. CO according to claim 1
2The method of air blowing hardening sand mold is characterized in that the diameter of described locating hole (4) is controlled between the 6mm-10mm, and the horizontal spacing (13) between adjacent two locating holes is controlled between the 100mm-200mm, and longitudinal pitch (14) is controlled between the 0-100mm.
3. CO according to claim 1
2The method of air blowing hardening sand mold is characterized in that described gas hole (11), its axially and the sand layer thickness between mold (2) surface should be less than 30mm, the distance between its top (7) and another sidewall of sandbox (1) (8) should be less than 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100274784A CN100453205C (en) | 2005-07-04 | 2005-07-04 | Method for hardening sand mold by CO2 blowing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100274784A CN100453205C (en) | 2005-07-04 | 2005-07-04 | Method for hardening sand mold by CO2 blowing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1701875A CN1701875A (en) | 2005-11-30 |
| CN100453205C true CN100453205C (en) | 2009-01-21 |
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ID=35631934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100274784A Expired - Fee Related CN100453205C (en) | 2005-07-04 | 2005-07-04 | Method for hardening sand mold by CO2 blowing |
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| Country | Link |
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| CN (1) | CN100453205C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100665B (en) * | 2012-12-27 | 2015-07-15 | 天瑞集团铸造有限公司 | Sodium silicate sand mould drying and hardening process |
| CN103192032B (en) * | 2013-04-22 | 2016-04-06 | 山东建筑大学 | A kind of water-glass sand CO 2negative pressure air blowing hardening process |
| CN104439093B (en) * | 2014-11-28 | 2016-08-17 | 浙江福莱克铸造科技有限公司 | The hardening process of waterglass sand mold and the vacuum tank in this technique |
| CN108746506B (en) * | 2018-05-29 | 2019-11-08 | 新乡市长城铸钢有限公司 | A method of preventing the reduction of sand mo(u)ld surface strength |
| CN108941468B (en) * | 2018-08-10 | 2021-02-05 | 陕西柴油机重工有限公司 | Sand casting method for slender cast iron rod |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1354822A (en) * | 1971-02-11 | 1974-06-05 | Ahlstroem Oy | Process for hardening with combustion gases a casting mould or core |
| JPS5725245A (en) * | 1980-07-18 | 1982-02-10 | Harada Chuzosho:Kk | Method and device for core molding |
| JPS57159234A (en) * | 1981-03-26 | 1982-10-01 | Sintokogio Ltd | Pattern for carbon dioxde mold |
| US4664171A (en) * | 1983-11-23 | 1987-05-12 | Dietmar Boenisch | Cold box process for producing mold parts |
| CN1065418A (en) * | 1992-05-28 | 1992-10-21 | 清华大学 | Heating, vacuum replacement hardening process core manufacturing craft and equipment |
| CN2122697U (en) * | 1992-06-10 | 1992-11-25 | 常州市压缩机配件厂 | Sand chilled and drawing machine |
| US5887639A (en) * | 1995-10-27 | 1999-03-30 | Sintokogio, Ltd. | Method and apparatus for manufacturing gas-hardened molds |
-
2005
- 2005-07-04 CN CNB2005100274784A patent/CN100453205C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1354822A (en) * | 1971-02-11 | 1974-06-05 | Ahlstroem Oy | Process for hardening with combustion gases a casting mould or core |
| JPS5725245A (en) * | 1980-07-18 | 1982-02-10 | Harada Chuzosho:Kk | Method and device for core molding |
| JPS57159234A (en) * | 1981-03-26 | 1982-10-01 | Sintokogio Ltd | Pattern for carbon dioxde mold |
| US4664171A (en) * | 1983-11-23 | 1987-05-12 | Dietmar Boenisch | Cold box process for producing mold parts |
| CN1065418A (en) * | 1992-05-28 | 1992-10-21 | 清华大学 | Heating, vacuum replacement hardening process core manufacturing craft and equipment |
| CN2122697U (en) * | 1992-06-10 | 1992-11-25 | 常州市压缩机配件厂 | Sand chilled and drawing machine |
| US5887639A (en) * | 1995-10-27 | 1999-03-30 | Sintokogio, Ltd. | Method and apparatus for manufacturing gas-hardened molds |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1701875A (en) | 2005-11-30 |
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Effective date of registration: 20181212 Address after: East Workshop No. 2655 Fujin Road, Baoshan District, Shanghai, 2010 Patentee after: Xin Technology (Shanghai) Material Technology Co., Ltd. Address before: No. 960 Zhongxing Road, Zhabei District, Shanghai 200070 Patentee before: Shanghai Institute of Machine Building Technology Co., Ltd. |
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Granted publication date: 20090121 Termination date: 20190704 |
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