CN103589942B - A kind of nodular graphite iron casting technique - Google Patents
A kind of nodular graphite iron casting technique Download PDFInfo
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- CN103589942B CN103589942B CN201310611637.XA CN201310611637A CN103589942B CN 103589942 B CN103589942 B CN 103589942B CN 201310611637 A CN201310611637 A CN 201310611637A CN 103589942 B CN103589942 B CN 103589942B
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- Prior art keywords
- nodularization
- molten iron
- clad
- agent
- casting technique
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 61
- 238000005266 casting Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 16
- 239000010439 graphite Substances 0.000 title claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000004382 potting Methods 0.000 claims abstract description 14
- 239000006188 syrup Substances 0.000 claims abstract description 14
- 235000020357 syrup Nutrition 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 239000002667 nucleating agent Substances 0.000 claims abstract description 10
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 4
- 238000011081 inoculation Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000011777 magnesium Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a kind of nodular graphite iron casting technique, this technique comprises the following steps: (1) nodularization is assured standby: nodularization handbag draws together inclusion and clad, first in the pit in inclusion, be sprinkled into nodulizing agent, nucleating agent, insulating covering agent successively, get out rear lifting clad by nodularization clad; (2) smelting and pouring: the making of potting syrup, the degree of its material chemical component is as follows: C:4.2 ~ 4.6%; Si:0.95 ~ 1.15%; Mn:0.12 ~ 0.18%; P:0.034%; S:0.024%; All the other are Fe; Above-mentioned raw materials is heated to smelting temperature in electric furnace, makes alloy fully melt formation molten iron; Poured into by the molten iron of fusing in the channel mould chamber on clad, molten iron pours from casting liquid entrance one-time continuous the nodularization handbag body being positioned at the pit the other end, and molten iron carries out nodularization, inoculation in nodularization bag, forms potting syrup; Pour into a mould die cavity with potting syrup, solidify rear formation foundry goods.By casting technique of the present invention, nodulizing agent specific absorption can be improved, reduce the usage quantity of nodulizing agent, reduce casting cost, realize environmental improvement.
Description
Technical field
The present invention relates to a kind of casting technique, particularly relate to a kind of nodular graphite iron casting technique, belong to casting technology field.
Background technology
Nodular graphite iron is one of current most widely used cast iron materials, it has the advantages that intensity is high, elongation is large, fatigue resistance is strong, wear resisting property is excellent, be important cast material, its use range is throughout departments such as automobile, agricultural machinery, boats and ships, metallurgy, chemical industry.Existing nodular graphite iron casting technique causes nodulizing agent specific absorption low because of spheroidizing reacion instability, and molten iron spills to be taken nodulizing agent out of and cause nodulizing agent usage quantity large, simultaneously because of flash of light during nodularization and dense smoke operating environment of pollution.
Summary of the invention
In order to solve the deficiency in background technology, the object of the invention is to the defect overcoming background technology, a kind of nodular graphite iron casting technique is provided, improve nodulizing agent specific absorption, reduce the usage quantity of nodulizing agent, realize environmental improvement.
For achieving the above object, the technical solution used in the present invention is: a kind of nodular graphite iron casting technique, is characterized in that: this technique comprises the following steps,
(1) nodularization is assured standby:
The nodularization handbag body for placing molten iron drawn together by a, described nodularization handbag, and the clad be arranged on above described inclusion, described clad is provided with channel mould chamber, one end bottom described inclusion is provided with the pit for spheroidizing reacion, the other end described clad being positioned at described pit is provided with casting liquid entrance, and described casting liquid entrance is communicated with inclusion with described channel mould chamber respectively;
B, nodularization bag use the day before yesterday that described clad is fixed oven dry, first nodulizing agent is put into described pit, be more evenly sprinkling upon on nodulizing agent by nucleating agent before cast, then cover one deck insulating covering agent, then lift by crane described clad by nodularization clad;
(2) smelting and pouring:
The making of a, potting syrup, the degree of its material chemical component is as follows:
C:4.2~4.6%；
Si：0.95~1.15%；
Mn：0.12~0.18%；
P：0.034%；
S：0.024%；
All the other are Fe;
B, above-mentioned raw materials is heated to smelting temperature in electric furnace, makes alloy fully melt formation molten iron;
C, pour the molten iron of fusing on described clad channel mould chamber, molten iron pours from casting liquid entrance one-time continuous the nodularization handbag body being positioned at the pit the other end, and molten iron carries out nodularization, inoculation in nodularization bag, forms potting syrup;
D, pour into a mould die cavity with potting syrup, solidify rear formation foundry goods.
In a preferred embodiment of the present invention, the add-on comprising described nodulizing agent is further 1.05% of molten iron total amount, and its moiety and weight ratio thereof are: 5.5 ~ 6.0%Mg, 2.0 ~ 2.5%RE, 38 ~ 40%Si, 2.0 ~ 3.0%Ca.
In a preferred embodiment of the present invention, the add-on comprising described nucleating agent is further 0.8% of molten iron total amount, and the add-on of described insulating covering agent is 0.6% of molten iron total amount.
In a preferred embodiment of the present invention, when comprising potting syrup cast die cavity in step (2) further, add with stream the nucleating agent accounting for molten iron total amount 0.2% again.
In a preferred embodiment of the present invention, comprising described nucleating agent is further silicon titanate innoculant.
In a preferred embodiment of the present invention, comprising smelting temperature in step (2) is further 1510 ~ 1520 DEG C.
Usefulness of the present invention is:
1, a kind of nodular graphite iron casting technique of the present invention, adopt tundish-cover nodulizing process, optimize the structure design of nodularization bag, nodularization handbag body adds a cover clad, spheroidizing reacion carries out completely under the protection of clad in bag, make to reduce because the effusion of magnesium steam and molten iron spill the nodularization dosage taken out of in nodulizing agent, thus the actual absorption rate of nodulizing agent is increased, add-on is corresponding minimizing also;
2, the iron liquid height that molten iron pours in inclusion process when nodulizing agent is upwards overflowed from casting liquid entrance one-time continuous increases, and the problem being absorbed more, overcome effusion and spill, improve the specific absorption of nodulizing agent further;
3, the add-on of balls agent of the present invention is 1.05% of molten iron total amount, and its moiety and weight ratio thereof are: 5.5 ~ 6.0%Mg, 2.0 ~ 2.5%RE, 38 ~ 40%Si, 2.0 ~ 3.0%Ca.The nodulizing agent Mg content that the present invention uses is few, is intended to emphasize to reduce magnesium steam escaped quantity, improves the specific absorption of nodulizing agent;
4, first molten iron arrives channel mould chamber, through casting liquid entrance unique entrance enter nodularization bag, the position that molten iron flows into nodularization bag through clad is fixed, and improves nodularization stability;
5, carry out in the bag of spheroidizing reacion completely under clad protection, the flash of light thus during nodularization and dense smoke basically eliminate, field labor environment obviously improves.
figure of description
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the structural representation of nodularization bag of the present invention.
In figure: 2, inclusion, 4, clad, 6, channel mould chamber, 8, pit, 10, casting liquid entrance.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and enable above-mentioned purpose of the present invention, feature and advantage become apparent more, below in conjunction with embodiment, the present invention is further detailed explanation.
Be now the nodular graphite iron of QT500-7 by this manufacture technics model, this manufacture craft comprises the following steps:
(1) nodularization is assured standby:
A, as shown in Figure 1, the nodularization handbag body 2 for placing molten iron drawn together by nodularization handbag, and the clad 4 be arranged on above inclusion 2, clad 4 is provided with channel mould chamber 6, one end bottom inclusion 2 is provided with the pit 8 for spheroidizing reacion, the other end clad 4 being positioned at pit 8 is provided with casting liquid entrance 10, casting liquid entrance 10 is communicated with inclusion 2 with channel mould chamber 6 respectively, molten iron first injects channel mould chamber 6 from smelting furnace through iron notch, the opposite side at the place that nodulizing agent is placed in nodularization handbag body 2 is entered again through casting liquid entrance 10, casting liquid entrance 10 is sole inlet that molten iron pours in inclusion 2, the position that molten iron pours in bag is certain, improve nodularization stability, molten iron is not that alignment with the ball agent pours, prevent the burst time too early, the generation of the fierce phenomenon of spheroidizing reacion,
B, nodularization bag use the day before yesterday that clad 4 is fixed oven dry, first the nodulizing agent accounting for molten iron total amount 1.05% is put into pit 8 before cast, again the silicon titanate innoculant accounting for molten iron total amount 0.8% is evenly sprinkling upon on nodulizing agent, cover the insulating covering agent that one deck accounts for molten iron total amount 0.6% again, make real gently, then lift by crane clad 4 by nodularization clad, preparation molten iron pours and carries out spheroidizing; The moiety of nodulizing agent and weight ratio thereof are: 5.5 ~ 6.0%Mg, 2.0 ~ 2.5%RE, 38 ~ 40%Si, 2.0 ~ 3.0%Ca, and in nodulizing agent, Mg content reduces, and are intended to emphasize to reduce magnesium steam escaped quantity, improve the specific absorption of nodulizing agent.
(2) smelting and pouring:
The making of a, potting syrup, the degree of its material chemical component is as follows:
C:4.2~4.6%；
Si：0.95~1.15%；
Mn：0.12~0.18%；
P：0.034%；
S：0.024%；
All the other are Fe;
B, above-mentioned raw materials is heated to smelting temperature in middle frequency furnace, alloy is made fully to melt formation molten iron, smelting temperature controls within the scope of 1510 ~ 1520 DEG C, spectroscopic analysis and metallurgical analysis are carried out in sampling, according to detected result, determine whether adjust, qualified base iron temperature accurately controls at 1515 DEG C, static 5 minutes, take slag off, wait for nodularization;
C, pour the molten iron of fusing on clad 4 channel mould chamber 6, molten iron pours from casting liquid entrance 10 one-time continuous the nodularization handbag body 2 being positioned at pit 8 the other end, control nodularization to play the fried time and be about 10s, nodularization time controling is at 1 ~ 3min, nodularization is unsuitable too fast, and reaction is unsuitable fierce, and molten iron carries out nodularization, inoculation in nodularization bag, poly-slag under the poly-slag effect of insulating covering agent, takes slag off and forms potting syrup;
D, in sand mold, pour into potting syrup, in casting process, add the silicon titanate innoculant accounting for molten iron total amount 0.2% again with stream, teeming temperature controls at 1345 ~ 1350 DEG C, solidifies rear formation foundry goods.
Under equal conditions, casting technique of the present invention is compared with traditional technique, and nodulizing agent add-on, technique of the present invention is 0.9 ~ 1.0%, and traditional technology is 1.5%, innoculant adding quantity, and technique of the present invention is 0.7%, and traditional technology is 0.6%.Produce 5000t nodular iron casting per year according to company to calculate, a nodulizing agent and nucleating agent can save 300,000 yuan every year.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; the change done under other any does not deviate from spirit of the present invention and principle, modification, substitute, combine, simplify the substitute mode that all should be equivalence, be included within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should define with claim is as the criterion.
Claims (6)
1. a nodular graphite iron casting technique, is characterized in that: this technique comprises the following steps,
(1) nodularization is assured standby:
The nodularization handbag body for placing molten iron drawn together by a, described nodularization handbag, and the clad be arranged on above described inclusion, described clad is provided with channel mould chamber, one end bottom described inclusion is provided with the pit for spheroidizing reacion, the other end described clad being positioned at described pit is provided with casting liquid entrance, and described casting liquid entrance is communicated with inclusion with described channel mould chamber respectively;
B, nodularization bag use the day before yesterday that described clad is fixed oven dry, first nodulizing agent is put into described pit, be more evenly sprinkling upon on nodulizing agent by nucleating agent before cast, then cover one deck insulating covering agent, then lift by crane described clad by nodularization clad;
(2) smelting and pouring:
The making of a, potting syrup, the degree of its material chemical component is as follows:
C:4.2~4.6%；
Si：0.95~1.15%；
Mn：0.12~0.18%；
P：0.034%；
S：0.024%；
All the other are Fe;
B, above-mentioned raw materials is heated to smelting temperature in electric furnace, makes alloy fully melt formation molten iron;
C, pour the molten iron of fusing on described clad channel mould chamber, molten iron pours from casting liquid entrance one-time continuous the nodularization handbag body being positioned at the pit the other end, and molten iron carries out nodularization, inoculation in nodularization bag, forms potting syrup;
D, pour into a mould die cavity with potting syrup, solidify rear formation foundry goods.
2. a kind of nodular graphite iron casting technique according to claim 1, it is characterized in that: the add-on of described nodulizing agent is 1.05% of molten iron total amount, its moiety and weight ratio thereof are: 5.5 ~ 6.0%Mg, 2.0 ~ 2.5%RE, 38 ~ 40%Si, 2.0 ~ 3.0%Ca.
3. a kind of nodular graphite iron casting technique according to claim 1, is characterized in that: the add-on of described nucleating agent is 0.8% of molten iron total amount, the add-on of described insulating covering agent is 0.6% of molten iron total amount.
4. a kind of nodular graphite iron casting technique according to claim 3, is characterized in that: add with stream the nucleating agent accounting for molten iron total amount 0.2% again during potting syrup cast die cavity in step (2).
5. a kind of nodular graphite iron casting technique according to claim 4, is characterized in that: described nucleating agent is silicon titanate innoculant.
6. a kind of nodular graphite iron casting technique according to claim 1, is characterized in that: in step (2), smelting temperature is 1510 ~ 1520 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310611637.XA CN103589942B (en) | 2013-11-28 | 2013-11-28 | A kind of nodular graphite iron casting technique |
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| CN201310611637.XA CN103589942B (en) | 2013-11-28 | 2013-11-28 | A kind of nodular graphite iron casting technique |
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| CN103589942A CN103589942A (en) | 2014-02-19 |
| CN103589942B true CN103589942B (en) | 2016-01-20 |
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| CN104404358A (en) * | 2014-11-17 | 2015-03-11 | 无锡市百顺机械厂 | Retarder rotor casting technology |
| CN112030063A (en) * | 2020-08-17 | 2020-12-04 | 锦州捷通铁路机械股份有限公司 | Process for producing high-elongation RuT350 vermicular graphite cast iron for railway rolling stock by covering vermicular graphite |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101255524A (en) * | 2007-12-22 | 2008-09-03 | 繁昌县金贸铸造有限责任公司 | Method for producing nodular graphite cast iron |
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN102383027A (en) * | 2011-10-20 | 2012-03-21 | 宁波康发铸造有限公司 | Preparation method of nodular cast iron |
| CN102534090A (en) * | 2012-02-15 | 2012-07-04 | 齐齐哈尔市精铸良铸造有限责任公司 | Preparation method of-60 ℃ low-temperature impact nodular cast iron |
| CN102634720A (en) * | 2012-04-17 | 2012-08-15 | 扬州五亭桥缸套有限公司 | Nodular cast iron cylinder sleeve and manufacturing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06108199A (en) * | 1991-08-20 | 1994-04-19 | Sumitomo Jukikai Plast Mach Kk | Spheroidal graphite cast iron |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101255524A (en) * | 2007-12-22 | 2008-09-03 | 繁昌县金贸铸造有限责任公司 | Method for producing nodular graphite cast iron |
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN102383027A (en) * | 2011-10-20 | 2012-03-21 | 宁波康发铸造有限公司 | Preparation method of nodular cast iron |
| CN102534090A (en) * | 2012-02-15 | 2012-07-04 | 齐齐哈尔市精铸良铸造有限责任公司 | Preparation method of-60 ℃ low-temperature impact nodular cast iron |
| CN102634720A (en) * | 2012-04-17 | 2012-08-15 | 扬州五亭桥缸套有限公司 | Nodular cast iron cylinder sleeve and manufacturing method thereof |
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