CN1410193A - Manufacturing method of cast iron mould cavity inoculation block - Google Patents
Manufacturing method of cast iron mould cavity inoculation block Download PDFInfo
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- CN1410193A CN1410193A CN 02139259 CN02139259A CN1410193A CN 1410193 A CN1410193 A CN 1410193A CN 02139259 CN02139259 CN 02139259 CN 02139259 A CN02139259 A CN 02139259A CN 1410193 A CN1410193 A CN 1410193A
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- borax
- boric acid
- nucleating agent
- inoculant block
- cast iron
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
A process for preparing the in-mould inoculating block of cast iron includes mixing boric acid with borax in ratio of 1:1 as adhesive, dissolving the mixture in a alcohol solution, proportionally mixing it with ferrosilicon particles with grain size of 6-12 meshes as inoculant, die pressing under 80-150 MPa and baking at 40-60 deg.C for 2-3 hr. Its advantages are fusing layer by layer, no collapse in disorder, and no residual dregs.
Description
Technical field: the invention belongs to the engineering materials field, relate to the manufacture method of a kind of cast iron with in-mold inoculation inoculant block.
Background technology: the importance of inoculation technology in Cast Iron Production is familiar with by people already, and it has become the important step of producing high quality cast iron spare, also is the effective measure of producing thin-walled, complexity, meehanite cast iron and improving the foundry goods processing characteristics.The effect of nucleating agent has ageing, and promptly pregnant effect weakens along with the prolongation of time, so nucleating agent adds the time that time of iron liquid solidifies near iron liquid more, and its effect is just good more, and the art of inoculation that adopts is current-following inoculation and mould cavity inoculation usually.Mould cavity inoculation belongs to instant inoculation, because it is effective, easy to operate, be suitable for streamline production and widespread use.During mould cavity inoculation, nucleating agent is that the form with inoculant block is placed in the casting mold, and the fusing gradually with the inflow of molten iron is dissolved in and plays inoculation(effect) in the molten iron when cast.Molding bonded technology is by add binding agent in nucleating agent particle or powder, after adhesive cures, makes nucleating agent form the moulding process of definite shape inoculant block.This technology is for other moulding processs, and having moulding process simply, does not need the large-scale low advantage of equipment input, cost.
In moulding process, adopt organic binder bonds at present more, as paraffin, polyvinyl alcohol (PVA), stearic acid etc., because the nucleating agent particle only relies on the cohesive strength of binding agent in the inoculant block of molding bonded, in transportation with to deposit in the process inoculant block fragile, the weight precision reduces; Under the souring of molten metal, inoculant block is defeated and dispersed easily, cause local mistake of foundry goods to breed, and deficiency is bred at the position that has.Experiment showed, in mould filling process,, hindered the reaction of molten metal and inoculant block, inoculant block can not be dissolved, cause and do not breed because organic binder bond is decomposed to form the vaporization protective membrane.The employing mineral binder bond that has, as water glass, in moulding process, the easy and ferrosilicon particle reaction of water glass forms compound layer, hinders the reaction of the molten iron and the nucleating agent that fill type earlier, causes and breeds hysteresis.Binding agent in the inoculant block is with after the nucleating agent particle mixes; form one deck adhesive film on nucleating agent particulate surface; when molten metal and the reaction of nucleating agent particle; at first be adhesive film to be destroyed at high-temperature liquid metal; molten metal could react with the nucleating agent particle then; increased the reaction resistance of nucleating agent and molten metal like this, caused and breed hysteresis.And because binding agent add-on more (being generally 3～5%), the gas that the binding agent pyrolytic decomposition produces, residue etc. enter in the foundry goods, are easy to generate pore, inclusion defect.
Summary of the invention: the present invention is in order to solve the uneven problem of inoculant block dissolution rate, proposes the manufacture method of a kind of cast iron with in-mold inoculation inoculant block: be to adopt boric acid, borax to make binding agent, by pressing machine with the extrusion forming of nucleating agent particle.Concrete steps are: A, employing 6～12 purposes 75 ferrosilicon particles, adopt boric acid, borax to make binding agent; B, with boric acid, borax mixed by 1: 1, add ethanolic soln then, stir and make borax, boric acid dissolving, form saturated solution; C, the alcohol saturated solution of boric acid, borax is joined in the nucleating agent by 1.5～5% weight percent, and mix; D, the nucleating agent that mixes is added in the mould, apply the pressure forming of 80～150Mpa; Inoculant block after F, the moulding is placed in 40～60 ℃ of drying bakers and toasts after 2～3 hours, removes moisture residual in the inoculant block and ethanol.The pressure forming method of this inoculant block adopts the elevated pressures moulding, has reduced the binding agent add-on; Adopt the alcohol saturated solution of mineral binder bond boric acid, borax to make binding agent, avoided the influence of organic binder bond, help the inoculant block dissolving evenly the inoculant block dissolution characteristics; This inoculant block is in dissolution process, successively melt, uniform dissolution, there is not defeated and dispersed phenomenon, because the inoculant block that adopts the pressure bonding moulding is in moulding process, big particle is crushed, forms fresh ferrosilicon surface, in casting process, inoculant block is under the souring of molten metal, because the corner effect, the pulverous nucleating agent of surface portion enters an actor's rendering of an operatic tune, plays inoculation(effect), solved the problem that breeds hysteresis, and there is mechanical bond power in follow-up particle owing between the nucleating agent particle in dissolution process, and the souring of molten metal can not make inoculant block defeated and dispersed, and because the fragmentation of macrobead nucleating agent in moulding process, increase fresh ferrosilicon surface, reduced the reaction resistance of nucleating agent and molten metal, guaranteed the inoculant block uniform dissolution; Although there is a layer binder in the nucleating agent particle surface, but owing to just decompose at low temperatures, degradation production can dilute the slag of ferrosilicon zone of oxidation and molten metal reaction formation, makes slag be washed away by molten metal, and is not attached on ferrosilicon and molten metal reaction interface; Solved the defective that common bond produces a large amount of toughness slags.
Embodiment: use method of the present invention, adopt boric acid, borax to make binding agent, by pressing machine with the extrusion forming of nucleating agent particle.And take following steps to carry out: A, employing 6～12 purposes 75 ferrosilicon particles, adopt boric acid, borax to make binding agent; B, with boric acid, borax by 1: 0.5～1 mixed, add ethanolic soln then, stir and make borax, boric acid dissolving, form saturated solution; C, the alcohol saturated solution of boric acid, borax is joined in the nucleating agent by 1.5～5% weight percent, and mix; D, the nucleating agent that mixes is added in the mould, apply the pressure forming of 80～150Mpa; Inoculant block after F, the moulding is placed in 40～60 ℃ of drying bakers and toasts after 2～3 hours, removes moisture residual in the inoculant block and ethanol.
Adopt 6～12 purposes, 75 ferrosilicon particles, by the GB2277-87 requirement.Adopt boric acid, borax to make binding agent, borax, boric acid belong to mineral binder bond, its gas-forming property is very little, and degradation production at high temperature can dilute the slag of silicon oxide layer and molten metal reaction formation, slag can be washed away by molten metal to be taken away, and be not attached on ferrosilicon and molten metal reaction interface, promote the dissolving of ferrosilicon particulate.During use, boric acid, borax by 1: 0.5～1 mixed, are added ethanolic soln then, stir and make borax, boric acid dissolving, form saturated solution.The alcohol saturated solution of boric acid, borax is joined in the nucleating agent by 1.5～5% weight percent, and mix.The nucleating agent that mixes is joined in the mould of definite shape, apply the pressure forming of 80～150Mpa.Under the effect of pressure, nucleating agent particle and die surface friction, grain breakage is at the no granular nucleating agent in the inoculant block surface of moulding; Equally, the nucleating agent particle in the mould passes through pressure transmission, mutual extrusion, and the zone of oxidation on nucleating agent surface is destroyed, and most of particle even fragmentation produce fresh ferrosilicon surface, help the reaction of nucleating agent and molten metal.Simultaneously, under the effect of pressure, produce mechanical bond power by mutual extrusion between the nucleating agent particle, this add-on that helps reducing binding agent can reduce.Inoculant block after the moulding is placed on and toasts after 2～3 hours in 40～60 ℃ of drying bakers, remove moisture residual in the inoculant block and ethanol, thereby reduced the influence of ethanol to foundry goods, and boric acid, borax remain in the inoculant block, its residual quantity has so just reached the purpose that reduces the binding agent add-on less than 1%.
According to above-mentioned processing step, adopt different proportionings to test, record testing data and test-results and see Table 1 in-mold inoculation inoculant block testing data:
Proof by experiment, the inoculant block reacting balance of this pressure forming, dissolution rate are even, satisfy demand of practical production.
The inoculant block of manufacturing of the present invention is shaped as truncated cone, at the top of inoculant block one pit is arranged.
Table 1 in-mold inoculation inoculant block testing data
| Sequence number | Saturated spirituous solution additional proportion (accounting for nucleating agent weight percent %) | Boric acid, borax ratio (%) | Test-results |
| 1 | 1.5 | 1: 0.5 | When adopting the stack casting experiment, increase along with the borax add-on, the inoculant block dissolution rate changes very little, breeding homogeneity increases, but from the metallographic structure of ladder sample, the difference of each layer of upper, middle and lower is very little.But because the bonding add-on is less relatively, breed and hysteresis phenomenon occurs, the ferrite content in ladder sample 3mm place's metallographic structure of lower floor is less than 60%. |
| 1: 0.8 | |||
| 1: 1 | |||
| 2 | 3.0 | 1: 0.5 | The intensity of inoculant block improves, breeding speed and homogeneity improves a lot than 1.5% add-on, breed hysteresis phenomenon and disappear, the ferrite content in the ladder sample 3 mm place metallographic structures of lower floor is greater than 70%. |
| 1: 0.8 | |||
| 1: 1 | |||
| 3 | 4.5 | 1: 0.5 | The intensity of inoculant block improves, breed speed and homogeneity and raising is arranged than 3.0% add-on, breed hysteresis phenomenon and disappear, the ferrite content in ladder sample 3mm place's metallographic structure of lower floor is greater than 70%. |
| ??1∶0.8 | |||
| ??1∶1 |
Claims (2)
1, a kind of cast iron is with the manufacture method of in-mold inoculation inoculant block: be to adopt boric acid, borax to make binding agent, by pressing machine with the extrusion forming of nucleating agent particle.
2, cast iron as claimed in claim 1 with the concrete steps of the manufacture method of in-mold inoculation inoculant block is:
A, employing 6～12 purposes 75 ferrosilicon particles adopt boric acid, borax to make binding agent;
B, with boric acid, borax mixed by 1: 1, add ethanolic soln then, stir and make borax, boric acid dissolving, form saturated solution;
C, the alcohol saturated solution of boric acid, borax is joined in the nucleating agent by 1.5～5% weight percent, and mix;
D, the nucleating agent that mixes is added in the mould, apply the pressure forming of 80～150Mpa;
Inoculant block after F, the moulding is placed in 40～60 ℃ of drying bakers and toasts after 2～3 hours, removes moisture residual in the inoculant block and ethanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139259 CN1228157C (en) | 2002-11-07 | 2002-11-07 | Manufacturing method of cast iron mould cavity inoculation block |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139259 CN1228157C (en) | 2002-11-07 | 2002-11-07 | Manufacturing method of cast iron mould cavity inoculation block |
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| CN1410193A true CN1410193A (en) | 2003-04-16 |
| CN1228157C CN1228157C (en) | 2005-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02139259 Expired - Fee Related CN1228157C (en) | 2002-11-07 | 2002-11-07 | Manufacturing method of cast iron mould cavity inoculation block |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110732658A (en) * | 2019-10-22 | 2020-01-31 | 东风精密铸造安徽有限公司 | in-mold casting inoculation block and inoculation method of nodular cast iron |
| CN111318644A (en) * | 2020-03-16 | 2020-06-23 | 宁夏新顺成特种合金有限公司 | Inoculation block production process for coated sand mold |
-
2002
- 2002-11-07 CN CN 02139259 patent/CN1228157C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110732658A (en) * | 2019-10-22 | 2020-01-31 | 东风精密铸造安徽有限公司 | in-mold casting inoculation block and inoculation method of nodular cast iron |
| CN110732658B (en) * | 2019-10-22 | 2021-08-24 | 东风精密铸造有限公司 | In-mold casting inoculation block and inoculation method of nodular cast iron |
| CN111318644A (en) * | 2020-03-16 | 2020-06-23 | 宁夏新顺成特种合金有限公司 | Inoculation block production process for coated sand mold |
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| Publication number | Publication date |
|---|---|
| CN1228157C (en) | 2005-11-23 |
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