CN101758208B - Method for fast cooling heavy section ductile iron castings - Google Patents
Method for fast cooling heavy section ductile iron castings Download PDFInfo
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- CN101758208B CN101758208B CN 200910201280 CN200910201280A CN101758208B CN 101758208 B CN101758208 B CN 101758208B CN 200910201280 CN200910201280 CN 200910201280 CN 200910201280 A CN200910201280 A CN 200910201280A CN 101758208 B CN101758208 B CN 101758208B
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- mold
- molds
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- casting
- cooling
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Abstract
The invention relates to the technical field of casting and discloses a method for fast cooling heavy section ductile iron castings, comprising the following steps: installing a cooling device around metal casting molds; and starting the cooling device to cool metal casting molds through spraying cooling medium after casting melted iron into the metal casting molds. The cooling device consists of a spray head, a switch, a water pipe and a rubber hose connection, and cools the metal casting molds with tap water at normal pressure. The positive effects of the invention are as follows: the molds can conduct heat continuously; the phenomenon of degraded spheroidization and graphite degeneration are inhibited; the mold-solidifying temperature gradient is increased; the structure and property of molds are improved; the metallurgical structure nodularity of the mold body is enhanced from grade 5 to above grade 3; the graphite size is enhanced from grades 4-5 to grades 5-6; the stable mechanical properties meet the requirements of QT600-3A; the mold quality is obviously improved; the produced mold has good processability; the facilities are simple and easy to operate, with no poison and pollution and easy for popularization and application.
Description
[technical field]
The invention belongs to casting technology field, concrete is a kind of heavy section ductile iron castings rapid cooling method.
[background technology]
In the spheroidal graphite cast-iron professional domain, usually cross dimensions is called heavy section ductile iron castings greater than the nodular iron casting of 100mm, its characteristics of solidifying are: the eutectic freezing time is long; Be easy to generate decaying spheroidisation, graphite morphology causes the mechanical properties decrease of spheroidal graphite cast-iron; Therefore, for accelerating the cooling of spheroidal graphite casting, shorten setting time; Generally adopt at present chill to shorten the setting time behind the cast iron liquid aborning, accelerate the cooling of nodular iron casting as chill material.
But, from the condition of production of reality, use chill also to have below it not enough as chill material:
(1) use chill as chill material (generally making) with casting pig; It uses the size (thickness) and the wall thickness of foundry goods to be non-linear relation; Therefore, be prone to cause accumulation of heat saturated, cooling Power is limited; Cause setting time to prolong, can not guarantee especially that greater than the nodular iron casting of 500mm the graphite form in centre does not produce distortion for cross dimensions;
(2) access times of chill are limited, have generally used just need more renew after 5～6 times, and this has just increased the production cost of casting;
When (3) adopting large-sized chill,, in sand mold, place fixing relatively difficulty, in operation, certain degree of difficulty is arranged because of its weight is big.
[summary of the invention]
The object of the present invention is to provide a kind of heavy section ductile iron castings rapid cooling method, utilize cooling medium can shorten the setting time of heavy section ductile iron castings, guarantee that foundry goods obtains satisfied globular graphite and institutional framework, satisfies the specification requirement of foundry goods.
For realizing above-mentioned purpose, the technical scheme that the present invention takes is:
A kind of heavy section ductile iron castings rapid cooling method is characterized in that, around the metal mold casting mold, cooling device is set, and after iron liquid casting advanced the metal mold casting mold, the switch of open cold radiator cooler sprayed cooling medium to the metal mold casting mold and cools off.
Described cooling device is connected and composed by shower nozzle, switch, water pipe and rubber hose, and the water pipe of 4～8 band shower nozzles is set, and every water pipe is provided with 4～6 shower nozzles, and the outlet diameter of shower nozzle is 1.0～3.0mm.
Described cooling medium is common running water, under normal pressure, through shower nozzle the metal mold casting mold is cooled off.
Principle of the present invention is: utilize common running water to be sprayed on the metal mold casting mold behind the iron liquid casting as cooling medium; Make the big temperature ladder of the inside and outside formation of metal mold casting mold poor; Accelerate the heat conduction of metal mold casting mold; Promote the continuous cooling of foundry goods in the metal mold casting mold, thereby shorten iron liquid setting time, obtain satisfied globular graphite and institutional framework.
The good effect of heavy section ductile iron castings rapid cooling method of the present invention is:
(1) through cooling that the metal mold casting mold of heavy section ductile iron castings is directly sprayed water; Make casting mold heat conduction continuously; Avoid casting mold to cause cooling velocity to reduce decaying spheroidisation, the graphite morphology phenomenon that is produced because of accumulation of heat is saturated, guaranteed to obtain satisfied result.
(2) use method of the present invention can shorten the about 60 minutes setting time of nodular iron casting; Thermograde when having improved casting solidification has been improved THE STRUCTURE OF CASTINGS and performance, and (casting dimension is φ 740～φ 1000 * 5000mm to foundry goods; Material is QT600-3A) the metallographic structure nodularization rate of body regulation sampling point brings up to more than 3 grades from 5 grades and (requires more than 4 grades); The graphite size is brought up to 5～6 grades from 4～5 grades, and tensile strength is brought up to 629MPa (requiring more than the 550MPa) from 530MPa, and stable mechanical property reaches the requirement of QT600-3A; Casting quality obviously improves, and production risk reduces greatly.
(3) foundry goods of application method production of the present invention has good processing properties.
(4) facility is simple, and is easy for installation, and cooling water is nontoxic, harmless, pollution-free to environment, and the steam that produces in the cooling procedure distributes through the ventilating opening of production site.
(5) easy and simple to handle; Application safety, only needing after casting pouring finishes, to open the cooling system switch can carry out, can (casting dimension is that φ 740～φ 1000 * 5000mm) cools off to the large section nodular iron casting; Operating personnel there is not special technical ability requirement, easy to utilize.
[specific embodiment]
Below explain the specific embodiment of heavy section ductile iron castings rapid cooling method of the present invention.
After mould assembling and closing is accomplished, at casting mold (metal mold) cooling device is set on every side, visual casting mold size is provided with cooling device.Cooling device is is generally connected and composed by shower nozzle, switch, water pipe and rubber hose, is connected with the water source, and the water pipe of 4～8 band shower nozzles can be set, and every water pipe is provided with 4～6 shower nozzles, and the outlet diameter of shower nozzle is 1.0～3.0mm.
After treating that the heavy section ductile iron castings cast finishes, open the switch of cooling device, casting mold (metal mold) is carried out the water spray cooling under the normal pressure, the water spray cooling can be continuous 4～10 hours.
Claims (1)
1. a heavy section ductile iron castings rapid cooling method is provided with cooling device around the metal mold casting mold, and after iron liquid casting advanced the metal mold casting mold, the open cold radiator cooler sprayed cooling medium to the metal mold casting mold and cools off; Described cooling device is connected and composed by shower nozzle, switch, water pipe and rubber hose, it is characterized in that, the water pipe of 4～8 band shower nozzles is set, and every water pipe is provided with 4～6 shower nozzles, and the outlet diameter of shower nozzle is 1.0～3.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910201280 CN101758208B (en) | 2009-12-17 | 2009-12-17 | Method for fast cooling heavy section ductile iron castings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910201280 CN101758208B (en) | 2009-12-17 | 2009-12-17 | Method for fast cooling heavy section ductile iron castings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101758208A CN101758208A (en) | 2010-06-30 |
| CN101758208B true CN101758208B (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910201280 Expired - Fee Related CN101758208B (en) | 2009-12-17 | 2009-12-17 | Method for fast cooling heavy section ductile iron castings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101758208B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161090B (en) * | 2010-12-23 | 2012-11-07 | 中国科学院金属研究所 | Method for improving self-feeding capacity of high and thick large-cross section casting blank |
| CN109079125A (en) * | 2018-08-07 | 2018-12-25 | 含山县兴达球墨铸铁厂 | A kind of mold for nodular iron casting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH682468A5 (en) * | 1992-05-27 | 1993-09-30 | Borut Marincek | Pore-free casting of grey cast iron@ - in temp. controlled metal mould using graphite eutectic compsn. |
| CN1262338A (en) * | 1999-01-28 | 2000-08-09 | 北京科技大学 | Grinding ball of martensite/bainite compounded cast iron and its production technology |
| JP2001240934A (en) * | 2000-02-29 | 2001-09-04 | Nkk Corp | Method for producing spheroidal graphite cast iron |
| JP2002317219A (en) * | 2001-04-23 | 2002-10-31 | Tokyo Tekko Co Ltd | Production method for spheroidal graphite cast iron product as-cast |
| CN1608770A (en) * | 2004-09-20 | 2005-04-27 | 沈阳铸造研究所 | Casting method of iron casting with water-cooled copper mold |
-
2009
- 2009-12-17 CN CN 200910201280 patent/CN101758208B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH682468A5 (en) * | 1992-05-27 | 1993-09-30 | Borut Marincek | Pore-free casting of grey cast iron@ - in temp. controlled metal mould using graphite eutectic compsn. |
| CN1262338A (en) * | 1999-01-28 | 2000-08-09 | 北京科技大学 | Grinding ball of martensite/bainite compounded cast iron and its production technology |
| JP2001240934A (en) * | 2000-02-29 | 2001-09-04 | Nkk Corp | Method for producing spheroidal graphite cast iron |
| JP2002317219A (en) * | 2001-04-23 | 2002-10-31 | Tokyo Tekko Co Ltd | Production method for spheroidal graphite cast iron product as-cast |
| CN1608770A (en) * | 2004-09-20 | 2005-04-27 | 沈阳铸造研究所 | Casting method of iron casting with water-cooled copper mold |
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| Publication number | Publication date |
|---|---|
| CN101758208A (en) | 2010-06-30 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20211217 |