CN102328034A - Cold type coated sand paint coating process for casting - Google Patents
Cold type coated sand paint coating process for casting Download PDFInfo
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- CN102328034A CN102328034A CN201110313547A CN201110313547A CN102328034A CN 102328034 A CN102328034 A CN 102328034A CN 201110313547 A CN201110313547 A CN 201110313547A CN 201110313547 A CN201110313547 A CN 201110313547A CN 102328034 A CN102328034 A CN 102328034A
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- cold mould
- mould body
- coated
- precoated sand
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Abstract
The invention discloses a cold type coated sand paint coating process for coating, which mainly comprises the following steps of: polishing the surface of the inner wall of a cold type body; heating the cold type body to 220 DEG C and preserving heat; when the temperature of the cold type body reaches 200 DEG C, polishing again; fetching the coated sand paint according to the specifications of the cold type body, and putting the coated sand paint in a coating device for stirring uniformly; and after the temperature of the cold type body reaches 180 DEG C, coating the coated sand paint on the inner wall of the cold type body, and hardening and forming. Through the process disclosed by the invention, the prepared paint layer of the cold type inner wall has uniform thickness, does not drop easily, and greatly improves the glossiness; and by applying the paint layer to roller casting, the phenomenon that the roller casting quality is influenced by the problem of the surface of the cold type inner wall in the casting process can be avoided, and the yield of a roller is greatly increased.
Description
Technical field
The present invention relates to a kind of processing technology in the casting field, particularly a kind of coating of the cold mould of using when being used for casting roll is coated with extension technology.
Background technology
The process of casting roll is that high temperature metal solution is poured into moulding in the cold mould.Cold mould is easy to generate wearing and tearing and heat fatigue under the centrifugal action of metallic solution, thereby reduces the service life of roll cold mould, influences the surface quality of roll.For solving the quality problems of roller surface, conventional way is to improve the quality of roller surface through the quality that changes cold type inner wall, and just the inner wall surface in cold mould sprays one deck zircon flour coating.But during to the cold type inner wall sprayed coating, adopt manual type to spray, because dust is bigger in the operating environment more; And when this operation was carried out, artificial control ability was insufficient, was easy to generate the generation that coating thickness is inconsistent, coating hardness is difficult for phenomenons such as adjusting, coating lack of homogeneity; Further cause casting flaws such as scabbing appears in roller surface; Cause roll working lining quality to descend, even roll is scrapped the influence use.
Summary of the invention
The present invention provides a kind of cold type inner wall fineness that can improve when being the technical problem that solves, and makes the cold mould coating of thickness of coating layer uniformity be coated with extension technology, with the quality of further raising roller surface.
For solving the problems of the technologies described above, the technical scheme that the present invention adopted is:
Casting is coated with extension technology with the precoated sand coating of cold mould, it is characterized in that may further comprise the steps:
A. check at first whether the cold mould body exists defective,, lie in a horizontal plane on the cold mould sander,, metallic luster all occurs until inner wall surface to the processing of polishing of the inner wall surface of cold mould body if zero defect is on-the-spot with cold mould body lifting to spraying;
B. the cold mould body is placed in the kiln and heats, when the cold mould body temperature reaches 200 ℃～220 ℃, stop heating, and be incubated 3～4 hours;
C. detect the temperature of cold mould body in real time,, the cold mould body is placed on the polishing of carrying out inner wall surface on the cold mould sander once more handles, metallic luster all occurs until inner wall surface when the temperature of cold mould body during at 200 ℃;
D. calculate the consumption of precoated sand coating according to the length of cold mould body and diameter, contain and get precoated sand coating, and precoated sand coating put into to be coated with hang device, stir according to calculating good consumption;
E. will be coated with and hang device and be installed on the support arm of cold mould sander, it is corresponding with the length of cold mould body to be coated with the length of hanging device, promotes support arm and will be coated with the extension device and extend in the cold mould body;
F. detect the temperature of cold mould body in real time; When the temperature of cold mould body is in 180 ℃～190 ℃ scopes, begin to be coated with and hang precoated sand coating to the cold mould inner body wall, be coated with this moment and hang the device transfixion; Uniform rotation cold mould body; Being coated with the extension time is 3～10min, and the precoated sand thickness of coating layer that is coated with extension is 1.5～5.0mm, and the uniformity of thickness of coating layer is ± 0.2mm;
G. when precoated sand after through-hardening on the cold type inner wall, the cold mould that stops operating body forms cold mould.
Computing formula among the step D according to the invention is specially: adopt following formula to carry out the calculating of precoated sand coating consumption among the step D
W＝0.15×D×(L+1.50)；
Wherein: W-precoated sand requirement, unit K g,
D-cold mould body diameter, the unit decimetre,
L-cold mould body length, the unit decimetre.
Because the technological progress of having adopted technique scheme, the present invention to obtain is:
The present invention adopts precoated sand coating to replace zircon flour coating of the prior art; Because the main component of precoated sand is a natural silica Sand; Have the intensity height, high temperature resistant, lowly get angry, low bulk, advantages such as good, the hot scab property of demolding performace is high, laxing property is good, curing rate is fast, thermally-stabilised and good heat conductivity; The inwall that is used for the cold mould body is coated with when hanging; Because a layer binder is contained on the surface of precoated sand coating, when precoated sand coating is coated with hang on the cold mould body after, the binding agent of precoated sand coating surface is met heat and is melted the inner wall surface that is bonded in the cold mould body; After cold mould body cooling, the sclerosis of precoated sand coating just can be securely attached to the inner wall surface of cold mould body.And other coating such as zirconium Ying Fen are because the difference of its composition and character; The necessary auxiliary material that cooperate could be attached to the cold mould body surface; And also can only adopt spraying method to be coated with extension; The technical process of its spraying is completely different with the present invention, and therefore of the present invention being coated with hung technology and only be applicable to precoated sand coating, that is to say that this processing technology mainly is to utilize the thermosetting performance of precoated sand to realize the extension process that is coated with of precoated sand coating.
In addition, the extension process that is coated with of the present invention all adopts machine to process, and does not have human error, and controllability is high, makes that the cold mould inner body wall surface smoothness after the processing improves greatly, and the even difficult drop-off of dope layer.Therefore adopt the present invention to the inwall of cold mould be coated with hang processing after; When re-using cold mould after the processing and carrying out the casting of roll; Can avoid in casting process, influencing the generation of the phenomenon of roll castability, improve the yield rate of roll greatly owing to the cold type inner wall surface goes wrong.
Description of drawings
Fig. 1: be the view of the present invention in being coated with the extension process.
Wherein: 1. cold mould body, 2. emery wheel, 3. cold mould sander runner, 4. motor-driven carrier, 5. slide rail, 6. support arm 7. is coated with the extension device.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is explained further details:
In casting field, in summer, be used for decimetre to diameter D=10, the cold mould body of length L=20 decimeter is coated with to hang and adds man-hour, may further comprise the steps:
A. at first whether the cold mould body 1 that will process of inspection exists defective, and for example whether the cold mould body is jagged, groove (width is greater than 5mm, and the degree of depth is greater than 1mm), crackle (width is greater than 1mm, and the degree of depth is greater than 3mm), pit be (greater than 25mm
2) etc. defective, must not use like defectiveness, perhaps agree to repair, and can use after identifying through engineering department; If zero defect, it is on-the-spot then can the cold mould body to be lifted spraying, lies in a horizontal plane on the cold mould sander, to the processing of polishing of the inner wall surface of cold mould body, metallic luster all occurs until inner wall surface.
The cold mould sander is as shown in Figure 1; Mainly comprise cold mould sander runner 3, slide rail 5, motor-driven carrier 4, support arm 6 and emery wheel 2; Motor-driven carrier can be controlled automatically also and can manually control, and motor-driven carrier moves on slide rail, and support arm stretches into an end of cold mould body emery wheel is installed.When the cold mould sander is polished to the cold mould body, at first the cold mould body is placed on the runner of cold mould sander, adjusts the height of support bar then according to the position of cold mould body, make emery wheel be close to the inwall of cold mould body, require to be as the criterion to satisfy polishing; Push away motor-driven carrier then, emery wheel is extend in the cold mould body, rotate the cold mould body, begin polishing and handle.
B. the cold mould body is placed in the kiln and heats, when the cold mould body temperature reaches 200 ℃～220 ℃, stop heating, be incubated 3～4 hours.
Stop heating when the temperature of cold mould body reaches 220 ℃ in the present embodiment, temperature retention time is 4 hours.
C. behind the cold mould body kiln discharge; Insert mercurial thermometer in the thermometer hole of cold mould body, measure the cold mould body temperature, when temperature reaches 200 ℃; The cold mould body is placed on the polishing of carrying out inner wall surface on the cold mould sander once more to be handled; Metallic luster all occurs until inner wall surface, purge the inner surface of cold mould body, and measure the temperature of cold mould body in real time.
D. according to the length of cold mould body and the consumption of diameter calculating precoated sand coating, computing formula is following
W＝0.15×D×(L+1.50)；
Wherein: W-precoated sand requirement, unit K g,
D-cold mould body diameter, the unit decimetre,
L-cold mould body length, the unit decimetre
Diameter D is 10 decimeters in the present embodiment, and length L is 20 decimeters, brings diameter and length into following formula, obtains the consumption of precoated sand coating:
W＝0.15×D×(L+1.50)＝0.15×10×(20+1.5)＝32.25Kg
Sheng is got 32.25Kg precoated sand coating, and precoated sand coating is put into to be coated with hang device, stirs.
E. will be coated with and hang device and be installed on the support arm of cold mould sander, it is corresponding with the length of cold mould body to be coated with the length of hanging device, promotes support arm and will be coated with the extension device and extend in the cold mould body.
Being coated with the length of hanging device in the present embodiment is 20 decimeters.
At first according to the height of the position adjustments support arm of cold mould body, be coated with the spray distance of hanging device and cold mould inner body wall and require to be as the criterion in this step to satisfy; Promote motor-driven carrier then and drive support arm and move, and will be coated with and hang device and extend in the cold mould body to the cold mould body.
F. detect the temperature of cold mould body in real time; When the temperature of cold mould body is in 180 ℃～190 ℃ scopes, begin to be coated with and hang precoated sand coating to the cold mould inner body wall, be coated with this moment and hang the device transfixion; Uniform rotation cold mould body; Be coated with and hang device to be coated with the extension time be 3～10min, the precoated sand thickness of coating layer that is coated with extension is 1.5～5.0mm, and the dope layer uniformity is ± 0.2mm.
Owing to be in summer, when the temperature of cold mould body is controlled at 180 ℃ in the present embodiment, begin to be coated with the extension precoated sand to the cold mould inner body wall, being coated with the extension time is 5min, and the precoated sand thickness of coating layer that is coated with extension is 2.0mm, and the dope layer uniformity is ± 0.1mm.
If in the winter time the cold mould body is processed, then the temperature in this step can be controlled at 190 ℃.
G. when precoated sand coating after through-hardening on the cold type inner wall, the cold mould that stops operating body, the extension process that is coated with of coating finishes.
Claims (2)
1. a precoated sand coating of casting with cold mould is coated with extension technology, it is characterized in that may further comprise the steps:
A. check at first whether the cold mould body exists defective,,, metallic luster all occurs until inner wall surface to the processing of polishing of the inner wall surface of cold mould body if zero defect is placed on cold mould body lifting on the cold mould sander to spraying in-situ horizontal;
B. the cold mould body is placed in the kiln and heats, when the cold mould body temperature reaches 200 ℃～220 ℃, stop heating, and be incubated 3～4 hours;
C. detect the temperature of cold mould body in real time,, the cold mould body is placed on the polishing of carrying out inner wall surface on the cold mould sander once more handles, metallic luster all occurs until inner wall surface when the temperature of cold mould body during at 200 ℃;
D. calculate the consumption of precoated sand coating according to the length of cold mould body and diameter, contain and get precoated sand coating, and precoated sand coating put into to be coated with hang device, stir according to calculating good consumption;
E. will be coated with and hang device and be installed on the support arm of cold mould sander, it is corresponding with the length of cold mould body to be coated with the length of hanging device, promotes support arm and will be coated with the extension device and extend in the cold mould body;
F. detect the temperature of cold mould body in real time; When the temperature of cold mould body is in 180 ℃～190 ℃ scopes, begin to be coated with and hang precoated sand coating to the cold mould inner body wall, be coated with this moment and hang the device transfixion; Uniform rotation cold mould body; Being coated with the extension time is 3～10min, and the precoated sand thickness of coating layer that is coated with extension is 1.5～5.0mm, and the uniformity of thickness of coating layer is ± 0.2mm;
G. when precoated sand after through-hardening on the cold type inner wall, the cold mould that stops operating body is coated with the extension process and finishes.
2. casting according to claim 1 is coated with extension technology with the precoated sand coating of cold mould, it is characterized in that: adopt following formula to carry out the calculating of precoated sand coating consumption among the said step D
W＝0.15×D×(L+1.50)；
Wherein: wherein: W-precoated sand requirement, unit K g,
D-cold mould body diameter, the unit decimetre,
L-cold mould body length, the unit decimetre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110313547 CN102328034B (en) | 2011-10-17 | 2011-10-17 | Cold type coated sand paint coating process for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110313547 CN102328034B (en) | 2011-10-17 | 2011-10-17 | Cold type coated sand paint coating process for casting |
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| CN102328034A true CN102328034A (en) | 2012-01-25 |
| CN102328034B CN102328034B (en) | 2013-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110313547 Active CN102328034B (en) | 2011-10-17 | 2011-10-17 | Cold type coated sand paint coating process for casting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480807A (en) * | 2013-08-26 | 2014-01-01 | 中钢集团邢台机械轧辊有限公司 | Spraying method of horizontal centrifugal roller cold model |
| CN104190882A (en) * | 2014-09-02 | 2014-12-10 | 华东泰克西汽车铸造有限公司 | Automatic spraying method used for cavities in casting molding line |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108358A (en) * | 1985-11-05 | 1987-05-13 | 机械工业部沈阳铸造研究所 | Precoated sand and process for making shell thereof |
| CN1285250A (en) * | 2000-07-25 | 2001-02-28 | 方向清 | Diaphragm-covering sand dynamic formation technology for casting and productive equipment thereof |
| JP2006255783A (en) * | 2005-02-16 | 2006-09-28 | Asahi Organic Chem Ind Co Ltd | Resin composition for shell mold, resin coated sand formed by coating refractory particles with the same, and casting mold formed by resin coated sand |
| US7150307B1 (en) * | 2005-08-03 | 2006-12-19 | Gm Global Technology Operations, Inc. | Lost foam casting apparatus and method for creating hollow gating |
| CN101249547A (en) * | 2008-03-24 | 2008-08-27 | 山东时风（集团）有限责任公司 | Tooth form part foundry technique method |
| CN101569923A (en) * | 2008-04-29 | 2009-11-04 | 胡富玲 | Production method for casting cylinder liner blank for ammonia refrigerator by adopting precoated sand molding |
-
2011
- 2011-10-17 CN CN 201110313547 patent/CN102328034B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108358A (en) * | 1985-11-05 | 1987-05-13 | 机械工业部沈阳铸造研究所 | Precoated sand and process for making shell thereof |
| CN1285250A (en) * | 2000-07-25 | 2001-02-28 | 方向清 | Diaphragm-covering sand dynamic formation technology for casting and productive equipment thereof |
| JP2006255783A (en) * | 2005-02-16 | 2006-09-28 | Asahi Organic Chem Ind Co Ltd | Resin composition for shell mold, resin coated sand formed by coating refractory particles with the same, and casting mold formed by resin coated sand |
| US7150307B1 (en) * | 2005-08-03 | 2006-12-19 | Gm Global Technology Operations, Inc. | Lost foam casting apparatus and method for creating hollow gating |
| CN101249547A (en) * | 2008-03-24 | 2008-08-27 | 山东时风（集团）有限责任公司 | Tooth form part foundry technique method |
| CN101569923A (en) * | 2008-04-29 | 2009-11-04 | 胡富玲 | Production method for casting cylinder liner blank for ammonia refrigerator by adopting precoated sand molding |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480807A (en) * | 2013-08-26 | 2014-01-01 | 中钢集团邢台机械轧辊有限公司 | Spraying method of horizontal centrifugal roller cold model |
| CN103480807B (en) * | 2013-08-26 | 2015-11-18 | 中钢集团邢台机械轧辊有限公司 | A kind of spraying method of horizontal centrifugal roller cold mould |
| CN104190882A (en) * | 2014-09-02 | 2014-12-10 | 华东泰克西汽车铸造有限公司 | Automatic spraying method used for cavities in casting molding line |
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| CN102328034B (en) | 2013-05-22 |
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