CN1557567A - Heating die centrifugal casting mold spraying process for grey cast iron pipe with flexible interface - Google Patents
Heating die centrifugal casting mold spraying process for grey cast iron pipe with flexible interface Download PDFInfo
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- CN1557567A CN1557567A CNA2004100030785A CN200410003078A CN1557567A CN 1557567 A CN1557567 A CN 1557567A CN A2004100030785 A CNA2004100030785 A CN A2004100030785A CN 200410003078 A CN200410003078 A CN 200410003078A CN 1557567 A CN1557567 A CN 1557567A
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Abstract
The casting mold spraying technological process for hot mold centrifugal casting of grey cast iron pipe includes the steps of: cleaning up residual coating in re-used casting mold or eliminating oil and rust in new casting mold and preheating; feeding the clean and properly heated casting mold to spraying site and driving the casting mold to rotate at high speed for spraying; starting the high pressure air-free spraying machine after the casting mold reaching its required rotation speed; spraying inside the casting mold with spray gun on spraying bogie; and feeding the sprayed casting mold to centrifugal machine site for casting molten iron centrifugally to form grey cast iron pipe. After the temperature lowered to proper value, the pipe is drawn and the next circulation is performed. The present invention has the advantages of less paint loss, compact coating with high strength, easy control of paint atomizing and high production efficiency.
Description
(1), technical field
The invention belongs to a kind of flexible interface gray cast iron tube hot-die mould centrifugal casting mould spraying coating process.
(2), background technology
At present, domestic flexible interface gray cast iron tube production technology has all been used gas blowout and has been coated with, and there have gas blowout to be coated with major defect to be as follows: (1), coating windage are big, two aspects influence: a is arranged, cause environmental pollution, easily causes anthraco-silicosis; B, paint waste are serious, by statistics, with this technology coating usage factor only 80～90%.(2), coating compactness is poor, intensity is low, two aspects influence: a is arranged, cause the percent defective height.Because at the high temperature liquid iron of 1450 ℃ of coating surface cast, pouring into a mould moment, strong heat exchange action causes coating shedding, forms slag inclusion, makes product rejection, this technology qualification rate is generally 80～85%; B, mold life-span are low.After coating is washed away by molten iron, molten iron will act directly on the mold inner surface, cause molten iron and mold bonding, or mould surface is washed into pit, and the mold life-span is reduced greatly.About 1000 of general cast of this technology mold life-span.(3), the coating atomizing is wayward.If compressed-air actuated air pressure instability, or nozzle wear all can have a strong impact on atomizing effect, causes the coating surface roughness big, causes that the product surface roughness is big.The general Ra10 of this artistic face roughness～20.(4), production efficiency is low.Because the application of compressed air atomised coating, quantity for spray is less, and when quantity for spray increased, atomization badness then, this technology spray time be generally at 2～3 minutes, so production efficiency is low, and 20～30 grey iron pipes of production in one hour.
(3), summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of flexible interface gray cast iron tube hot-die mould centrifugal casting mould spraying coating process, not only the coating windage is little for it, and coating compactness is good, the intensity height, and also the coating atomizing is easy to control, the production efficiency height.
The present invention solves the processing step that its technical problem takes: a, mold are cleared up remaining coating, after mold pours molten iron and gray cast iron tube is pulled out, the mold inner surface has the remaining coating of part, remaining coating being cleaned out before the spraying again, just can obtain the uniform coating of thickness; B, preheating, if use new mold, at first necessary degreasing and rust removal carries out preheating to mold again; C, the mold that temperature is suitable, inner surface is clean are in time delivered to spray station, drive bottom mold at electric rotating machine and rotate at a high speed, prepare spraying; D, after rotational speed of casting die reaches requirement, start high pressure airless spray equipment; E, spraying dolly drive spray gun evenly spraying in mold; F, the mold after will spraying are in time delivered to the centrifuge station, carry out the centrifugal casting molten iron, and molten iron is cooled to gray cast iron tube, after temperature is suitable, gets final product tube drawing, repeats next circulation behind the tube drawing.
The present invention is the following advantage of tool compared with prior art: (1), coating windage are little, have two aspect advantage: a, working environment to be greatly improved; B, paint waste reduce, by statistics, with this technology coating usage factor only more than 95%.(2), coating compactness is good, the intensity height has two aspect advantage: a, qualification rate height, this technology qualification rate is generally 95～98%; B, mold life-span improve greatly, about 2500～3000 of general cast of this technology mold life-span.(3), the coating atomizing is easy to control.Owing to use high pressure airless spray equipment, the coating atomizing is stable, make the coating surface roughness little, thereby the product surface roughness is little, the general Ra5 of this artistic face roughness～10.(4), production efficiency height.Because the applying high voltage airless sprayer, quantity for spray increases greatly, and spray time shortens, and this technology spray time is generally at 40～55 seconds, so the production efficiency height can be produced 50～55 grey iron pipes in one hour.
(4), description of drawings
Accompanying drawing is a process chart of the present invention.
(5), the specific embodiment
Processing step of the present invention is successively: a, mold are cleared up remaining coating: after mold pours molten iron and gray cast iron tube pulled out, the mold inner surface has the remaining coating of part, remaining coating being cleaned out before the spraying again, just can obtain the uniform coating of thickness.If b uses new mold, at first necessary degreasing and rust removal carries out preheating to mold again, and the preheat temperature of mold inner surface is 200～250 ℃.C, the mold that temperature is suitable, inner surface is clean are in time delivered to spray station, and the speed that drives bottom mold 700～800r/min at electric rotating machine is rotated at a high speed, prepare spraying, and d, after rotational speed of casting die reaches requirement starts high pressure airless spray equipment.E, spraying dolly drive spray gun evenly spraying in mold, and the pressure of spraying is 1～2Mpa, and the flow of nozzle is 0.3～1.7kg/min, and the walking speed of spray gun is 0.1～0.2m/s, and the thickness of coating is 0.2～0.4mm.F, the mold after will spraying are in time delivered to the centrifuge station, carry out the centrifugal casting molten iron, and molten iron is cooled to gray cast iron tube, after temperature is suitable, gets final product tube drawing, repeats next circulation behind the tube drawing.Process chart is seen accompanying drawing.
Claims (4)
1, a kind of flexible interface gray cast iron tube hot-die mould centrifugal casting mould spraying coating process, processing step of the present invention is: a, mold are cleared up remaining coating, after mold pours molten iron and gray cast iron tube is pulled out, the mold inner surface has the remaining coating of part, remaining coating being cleaned out before the spraying again, just can obtain the uniform coating of thickness; It is characterized in that: b, preheating, if use new mold, at first necessary degreasing and rust removal carries out preheating to mold again; C, the mold that temperature is suitable, inner surface is clean are in time delivered to spray station, drive bottom mold at electric rotating machine and rotate at a high speed, prepare spraying; D, after rotational speed of casting die reaches requirement, start high pressure airless spray equipment; E, spraying dolly drive spray gun evenly spraying in mold; F, the mold after will spraying are in time delivered to the centrifuge station, carry out the centrifugal casting molten iron, and molten iron is cooled to gray cast iron tube, after temperature is suitable, gets final product tube drawing, repeats next circulation behind the tube drawing.
2, spraying coating process according to claim 1 is characterized in that: the preheat temperature of described mold inner surface is 200～250 ℃.
3, spraying coating process according to claim 1 is characterized in that: the rotating speed of described mold is 700～800r/min.
4, spraying coating process according to claim 1 is characterized in that: the pressure of spraying is 1～2Mpa, and the flow of nozzle is 0.3～0.7kg/min, and the walking speed of spray gun is 0.1～0.2m/s, and the thickness of coating is 0.2～0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100030785A CN1297352C (en) | 2004-01-18 | 2004-01-18 | Heating die centrifugal casting mold spraying process for grey cast iron pipe with flexible interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100030785A CN1297352C (en) | 2004-01-18 | 2004-01-18 | Heating die centrifugal casting mold spraying process for grey cast iron pipe with flexible interface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1557567A true CN1557567A (en) | 2004-12-29 |
| CN1297352C CN1297352C (en) | 2007-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100030785A Expired - Fee Related CN1297352C (en) | 2004-01-18 | 2004-01-18 | Heating die centrifugal casting mold spraying process for grey cast iron pipe with flexible interface |
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| CN (1) | CN1297352C (en) |
Cited By (4)
| 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 |
| CN104001893A (en) * | 2014-04-25 | 2014-08-27 | 江苏紫金动力股份有限公司 | Fabrication method of cylinder liner and special device therefor |
| CN108067411A (en) * | 2016-11-14 | 2018-05-25 | 宁波江丰电子材料股份有限公司 | The brushing method of casting tool |
| CN110153391A (en) * | 2019-05-23 | 2019-08-23 | 嘉兴铸工智能设备有限公司 | A kind of centrifugal casting technique of centrifugal casting machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044981C (en) * | 1992-10-14 | 1999-09-08 | 夏志良 | Technique for coating inside wall of metal pipe with plastic powder |
| CN1341841A (en) * | 2001-07-30 | 2002-03-27 | 高原 | Processing process of cast iron radiator |
| KR20030030233A (en) * | 2001-10-09 | 2003-04-18 | 주식회사 보명 | Method of surface painting of streetlight pole made of castiron |
-
2004
- 2004-01-18 CN CNB2004100030785A patent/CN1297352C/en not_active Expired - Fee Related
Cited By (6)
| 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 |
| CN104001893A (en) * | 2014-04-25 | 2014-08-27 | 江苏紫金动力股份有限公司 | Fabrication method of cylinder liner and special device therefor |
| CN104001893B (en) * | 2014-04-25 | 2016-04-20 | 江苏紫金动力股份有限公司 | A kind of preparation method of cylinder sleeve and special purpose device thereof |
| CN108067411A (en) * | 2016-11-14 | 2018-05-25 | 宁波江丰电子材料股份有限公司 | The brushing method of casting tool |
| CN110153391A (en) * | 2019-05-23 | 2019-08-23 | 嘉兴铸工智能设备有限公司 | A kind of centrifugal casting technique of centrifugal casting machine |
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| Publication number | Publication date |
|---|---|
| CN1297352C (en) | 2007-01-31 |
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| SE01 | Entry into force of request for substantive examination | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070131 Termination date: 20140118 |