WO2007010848A1 - Sable enduit de resine pour une utilisation pour de l'acier coule, moule fabrique a partir de ce sable, et moulage d'acier moule en utilisant ce moule - Google Patents

Sable enduit de resine pour une utilisation pour de l'acier coule, moule fabrique a partir de ce sable, et moulage d'acier moule en utilisant ce moule Download PDF

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Publication number
WO2007010848A1
WO2007010848A1 PCT/JP2006/314046 JP2006314046W WO2007010848A1 WO 2007010848 A1 WO2007010848 A1 WO 2007010848A1 JP 2006314046 W JP2006314046 W JP 2006314046W WO 2007010848 A1 WO2007010848 A1 WO 2007010848A1
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WO
WIPO (PCT)
Prior art keywords
steel
sand
mold
resin
hot
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PCT/JP2006/314046
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English (en)
Japanese (ja)
Inventor
Toshio Tanaka
Ken Ogasawara
Eiji Nohara
Original Assignee
Komatsu Ltd.
Asahi Organic Chemicals Industry Co., Ltd.
Komatsu Castex Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Komatsu Ltd., Asahi Organic Chemicals Industry Co., Ltd., Komatsu Castex Ltd. filed Critical Komatsu Ltd.
Priority to CN2006800257334A priority Critical patent/CN101222992B/zh
Priority to JP2007525990A priority patent/JP4545192B2/ja
Publication of WO2007010848A1 publication Critical patent/WO2007010848A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
    • B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
    • B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • B22C1/2246—Condensation polymers of aldehydes and ketones
    • B22C1/2253—Condensation polymers of aldehydes and ketones with phenols

Definitions

  • the present invention relates to a resin-coated sand suitable for steel, a steel-coated steel mold made of the resin-coated sand, and a steel product forged from the steel mold.
  • the present invention relates to a resin-coated sand that can effectively reduce the occurrence of hot cracks and hot water wrinkles that tend to occur in steel products, a steel mold made of the same sand, and a steel product made from the same mold.
  • water glass which is an inorganic binder
  • carbon dioxide gas is passed through to gel the water glass and cure the mold.
  • a dry seal mold method is known as another mold forming method for steel.
  • coconut resin is coated as an organic binder on dredged sand, and the resulting resin-coated sand (RCS) is filled into a preheated model.
  • RCS resin-coated sand
  • the resin coated with the sand is condensed by the heat of the model to form a shell layer.
  • the shell layer is further heated and cured together with the model, and then the shell layer is released from the model cover to produce a saddle shape.
  • Patent Document 1 An invention relating to a phenol resin composition used as a saddle type material in such a shell mold method is disclosed in JP-A-57-68240 (Patent Document 1).
  • the phenolic resin composition described in Patent Document 1 is a low-molecular composition composed of three components: phenol, bisphenol A, and a separated component or derivative in the residue generated when bisphenol A is produced. It is a phenolic resin composition exhibiting expansibility.
  • the mold is rich in flexibility and has better flexibility. have. Further, it is said that by performing forging using a mold having such characteristics, it is possible to suppress the occurrence of hot cracks and pinholes (gas defects) in the object.
  • the term “sexuality” refers to the property that the mold shrinks together with the bowl, and the performance of the bowl that can withstand the shrinkage and expansion of the molten metal.
  • the strength of the molten metal is quite different from that of the non-ferrous metal structure (for example, aluminum), and for the shell mold method.
  • Inventions relating to materials are disclosed in Japanese Patent Publication No. 31-7256 (Patent Document 2) and Japanese Patent Application Laid-Open No. 9-57391 (Patent Document 3).
  • the forging temperature is lower than that of steel. Specifically, when manufacturing steel products, the forging temperature is about 1500-1600 ° C, whereas for aluminum, the forging temperature is about 660-700 ° C, which is extremely low! ,.
  • Patent Document 2 adds 0.5 to 20% by weight of a substance that imparts or transmits oxygen (for example, lead tetraphosphate or potassium nitrate).
  • a substance that imparts or transmits oxygen for example, lead tetraphosphate or potassium nitrate.
  • the use of phenol resin as a binder in RCS is described.
  • the decomposition of the binder can be promoted to improve the saddle-type disintegration property.
  • the core binder can be thermally decomposed by forging a hollow aluminum bowl and then subjecting the obtained mold with a core to heat treatment (sand baking). As a result, the strength of the core is reduced, and the core can be easily taken out from the hollow casing.
  • Patent Document 3 shows sufficient saddle-shaped disintegration even in such a low temperature region.
  • RCS refractory particles, phenolic resin, oxygen-containing hydrocarbon compounds (lower carboxylic acids, etc.) with an oxygen content of 25% by weight or more, and alkali metal nitrates (nitric acid lithium, sodium nitrate, etc.)
  • RCS which has a saddle-type disintegration improver contained at a predetermined ratio as an essential component.
  • Patent Documents 2 and 3 are intended only to improve saddle-type disintegration in a non-ferrous metal having a low forging temperature such as aluminum described above. For this reason, there is no discussion at all regarding the problems related to hot cracks and hot water wrinkles that occur in the wrought goods, and specific means for suppressing the occurrence of hot cracks and hot water wrinkles are described. Absent.
  • potassium nitrate is exemplified as a substance that improves the disintegration property of the core.
  • This potassium nitrate is an explosive substance known as an explosive component.
  • potassium nitrate is generally known to sinter by heating above 900 ° C.
  • Patent Document 1 Japanese Patent Laid-Open No. 57-68240
  • Patent Document 2 Japanese Patent Publication No. 31-7256
  • Patent Document 3 JP-A-9-57391
  • the present invention has been made to solve the above conventional problems, and its specific purpose is as follows.
  • a resin-coated sand for steel that can prevent hot cracks and at the same time effectively reduce the occurrence of hot water wrinkles, a steel mold made using the sand, And to provide a steel product forged by the same mold.
  • the resin-coated sand provided by the present invention has, as a basic structure, cocoon sand, 2.5 to 5.0% by weight of phenolic greaves and potassium nitrate based on the cocoon sand. And vinsol is the main feature.
  • the phenolic component of the phenolic resin comprises bisphenol A, a residue generated during purification of the bisphenol A, and a derivative of the separated component in the residue.
  • Group power It is preferred to comprise at least one selected.
  • the compounding amount of the potassium nitrate is 2 to 50% by weight, and the compounding power of the vinsol is preferably 4.0 to 20% by weight with respect to the phenolic resin.
  • the steel mold provided by the present invention is a steel mold having a thickness of 6 to 15 mm and a surface area of 1000 cm 2 or more, wherein the resin-coated sand of the present invention is used.
  • the main feature is that it is molded by use. In this case, it is preferable that the hot strength of the saddle type is 120 to 175 NZcm 2 ! / ⁇ .
  • the steel product provided by the present invention is a steel product manufactured using the steel mold of the present invention, the steel product having a thickness of 6 to 15 mm, have a 1000 cm 2 or more surface area, and has a main feature in that hot cracks occur ⁇ surface in contact with the ⁇ is 70mm or less.
  • the steel product of the present invention has an excellent quality that the steel product's hot water is grade 1 or 2 based on JIS G 0588. Furthermore, the steel product of the present invention preferably has a weight of 35 kg or more. The invention's effect
  • the resin-coated sand (RCS) of the present invention contains dredged sand, 2.5 to 5.0% by weight of phenolic rosin, potassium nitrate, and vinsol.
  • vinsol is added in addition to the addition of potassium nitrate.
  • Vinsol resin is derived from pine trees and is a dark, high-melting thermoplastic. Products from Hercules Powder Company are sold on the market. This vinsol resin does not cure three-dimensionally even when it receives heat, so the cushioning effect Has fruit. In order to further enhance this cushioning property, a small amount of petroleum-based rosin rosin or the like can be used in combination. In the present invention, the added force of vinsol promotes softening of the shell cage shape by receiving heat and further improves the properties of the steel plate. On the other hand, vinsol has a tendency to increase the hot strength as rosin. When pouring molten metal, it is necessary to keep the hot strength low enough to maintain the shape of the bowl until the melt is solidified.
  • the hot strength of vinsol is efficiently suppressed by adding potassium nitrate as described above.
  • the potassium nitrate and vinsol additive is an indispensable requirement for synergistically exhibiting both the above-described properties and the vertical shape retention during solidification of the molten metal.
  • the mold itself can generate heat during fabrication.
  • the blending amount of potassium nitrate at this time is preferably 2 to 50% by weight based on phenol resin.
  • the phenolic component of the phenolic sebum is selected from, for example, bisphenol A, a residue generated during purification of the bisphenol A, and a derivative of a separation component in the residue. Contains at least one species.
  • a phenolic rosin By including such a phenolic rosin, it is possible to improve the shape of the bowl and to impart more properties. This makes it possible to deform the mold more appropriately as the molten metal solidifies and shrinks during fabrication. The occurrence of intercracking can be very effectively prevented.
  • the RCS of the present invention further contains vinsol.
  • the property can be further improved from the saddle shape, so that the occurrence of hot cracks can be more effectively prevented.
  • the blending amount of vinsol is preferably 4.0% by weight or more and 20% by weight or less with respect to the phenolic resin. 4. If the amount is less than 0% by weight, the desired improvement in the properties cannot be expected. If the amount exceeds 20% by weight, the hot strength is too low and the bowl shape tends to collapse, and the finished bowl has the desired shape. Is difficult to obtain.
  • the steel mold provided by the present invention is a mold used for forging steel products having a thickness of 6 to 15 mm and a surface area of 1000 cm 2 or more, and using the RCS of the present invention. Are molded. By performing forging using such a steel mold, it is possible to prevent the occurrence of hot cracks and hot water wrinkles as described above, and to produce a steel product having a good skin. it can
  • hot strength is 120 ⁇ 175NZcm 2. For this reason, it is possible to stably manufacture a steel plate having a desired shape by appropriately maintaining the shape of the steel plate when pouring molten steel.
  • the steel product of the present invention is a steel product having a surface area of 6 to 15 mm and a surface area of 1000 cm 2 or more, which is manufactured by using the steel mold. In addition, it is an excellent quality product with a hot crack generated on the surface of the surface in contact with the vertical shape of 70 mm or less.
  • the steel product of the present invention is a high-quality product that is suppressed so as to be grade 1 or 2 in the class classification based on SJIS G 0588.
  • the steel frame is manufactured to have a weight of 35 kg or more.
  • Such steel products have a surface area force of S4000 cm 2 or more when the average strength is about 10 mm.
  • Such a thin-walled steel frame having a weight of 35 kg or more and a relatively large size has a large amount of shrinkage at the time of forging, so it has been easy to generate hot cracks in the past.
  • the present invention is very useful for such a thin-walled steel frame, and can effectively suppress the occurrence of hot cracks and hot water wrinkles.
  • FIG. 1 is a front view schematically showing a measurement method using a hot deflection measuring device.
  • FIG. 2 A schematic cross-sectional view schematically showing a saddle-shaped configuration.
  • (a) is a front view schematically showing a forged large steel product, and (b) is a cross-sectional view with a plane perpendicular to the thickness direction of the same large steel product.
  • (C) is a II cross-sectional view shown in (a).
  • (a) is a cross-sectional view schematically showing a cross-section of a forged medium-sized steel product
  • (b) is a cross-sectional view taken along II-II shown in (a)
  • (c) is It is III-III sectional drawing shown to (a).
  • (a) is a cross-sectional view schematically showing a cross-section of a forged small steel product
  • (b) is a side view of the small steel product
  • (c) is a side view of the small steel product. It is a bottom view of steel products.
  • the RCS in a preferred embodiment of the present invention is 2.0 to 50% by weight of dredged sand, 2.5 to 5.0% by weight phenolic resin and 2.0 to 50% of the same phenolic resin. 4.0% by weight to 20% by weight of potassium nitrate and 20% by weight of the same phenolic resin. And so on.
  • This dredged sand may be natural sand or artificial sand, and is not particularly limited. Specific examples include, for example, dredged sand, olivine sand, zircon sand, chromite sand, alumina sand, Hue mouth chrome slag, Hue mouth-Neckel slag, converter slag, mullite artificial particles (for example, ITOCHU Ceratech Corporation) Trade names available from the company “Nyiga Sera Beads”), and these reclaimed sand. These may be used alone or in combination of two or more.
  • dredged sands it is preferable to use dredged sand, and it is more preferable to use dredged sand and recycled sand in combination. Furthermore, by mixing zircon sand, seizure during fabrication can be prevented.
  • the reclaimed sand is obtained by crushing a lump-shaped lump collected after spreading the reed-shaped sand with a known crusher such as a crusher and subjecting the obtained sand granules to a predetermined regenerating process.
  • a known crusher such as a crusher
  • the regeneration treatment include a wear-type regeneration treatment that removes deposits adhering to the surface of the sand, and a roasting regeneration treatment that removes the deposit by heat treatment.
  • the present invention is not limited to these, and any conventionally known treatment can be adopted as long as it can remove the adhering material of the sand.
  • the phenolic greaves function as a binder that binds and holds the particles of the fine sand.
  • the phenolic resin is not particularly limited as long as it is a resin mainly composed of a reaction product of phenols and aldehydes and having a property of being heat-cured in the presence or absence of a curing agent. Absent.
  • the phenolic resin is 2.5 to 5.0% by weight, more preferably 2.7% with respect to the sand.
  • phenolic resin examples include novolac-type phenolic resin, resol-type phenolic resin, nitrogen-containing resol-type phenolic resin, pendyl ether-type phenolic resin, low-expansion phenolic resin, and Modifications produced by mixing or reacting these phenolic resins with, for example, epoxy resins, urea resins, melamine resins, xylene resins, polyamide resins, epoxy compounds, melamine compounds, urea compounds, etc.
  • phenolic resin examples include novolac-type phenolic resin, resol-type phenolic resin, nitrogen-containing resol-type phenolic resin, pendyl ether-type phenolic resin, low-expansion phenolic resin, and Modifications produced by mixing or reacting these phenolic resins with, for example, epoxy resins, urea resins, melamine resins, xylene resins, polyamide resins, epoxy compounds, melamine compounds, urea compounds, etc.
  • phenolic resin may be used alone or in combination of two or more.
  • a non-self-curing resin such as a novolak-type phenol resin
  • hexamine hexamethylenetetramine
  • hexamine it is preferable to add hexamine at about 5 to 12% by weight with respect to the phenolic resin.
  • group resin Generally, it is a solid of a suitable shape, and is used as a resin liquid or a solution as needed. Also, it can be done by using both solid and liquid.
  • the phenol-based ⁇ is 30 to 90 weight 0/0 preferably comprises low expansion phenol ⁇ of 50 to 80 wt%.
  • This low-expansion phenol resin should contain at least one selected from the group power consisting of bisphenol A, a residue produced during purification of the bisphenol A, and derivatives of separated components in the residue.
  • a phenol rosin as disclosed in Patent Document 1 can be used.
  • phenol-based ⁇ is by Dale include such low expansion phenol ⁇ 30 to 90 weight 0/0, no sex better become ⁇ when molding the ⁇ Can be used.
  • the content of the low-expansion phenolic resin exceeds 90% by weight, there is a risk that a molding failure may occur due to a decrease in the curing rate of the phenolic resin when molding the mold.
  • the content of low-expansion phenolic resin is less than 30% by weight, baling tends to occur in the steel when forging.
  • the above-described phenolic resin is used in combination with amino-based, epoxy-based, and bull-based silane coupling agents and Z or lubricants, which are useful for improving the quality of the mold-type strength and lubricity. You can also.
  • silane coupling agent examples include y-aminopropyltriethoxysilane, N- ⁇ - (aminoethyl) - ⁇ -aminopropyltrimethoxysilane, ⁇ -glycidoxypropyl trimethoxysilane, j8 — (3,4-epoxycyclohexenole) -etyltrimethoxysilane, vinyltrimethoxysilane, buturis (
  • the lubricant include ethylene bis stearic acid amide, methylene bis stearic acid amide, oxystearic acid amide, and methylol stearic acid amide.
  • Potassium nitrate which is one of the essential components of this embodiment, is 2 to 50% by weight, preferably 3 to 25% by weight, and more preferably 5%, based on the weight of phenolic resin (solid conversion). It mix
  • the amount of vinsol is preferably 10% by weight or more and 20% by weight or less, more preferably 10 to 15% by weight, based on the weight of phenolic resin (in terms of solid content). Merge. Thereby, the property can be further improved from the shape of the saddle. For this reason, generation of hot cracks can be more effectively prevented.
  • vinsol for example, a pine resin extract or a rosin-extracted rosin residue, specifically, a trade name “bin sol resin” (acid value 95) manufactured by Herxules can be used. In this case, if the content of vinsol in the phenolic greaves is less than 4.0% by weight, it is not possible to expect a further improvement in the properties as required by vinsol. On the other hand, if it exceeds 20% by weight, the hot strength of the mold becomes too low, or gas defects are likely to occur in the steel during forging.
  • the RCS of the present embodiment in addition to the above components, various additives such as anti-caking agents such as calcium stearate, mold release agents, deodorants, bengara, iron sand, etc. are necessary. Depending on the condition, it can be appropriately blended in a predetermined amount.
  • anti-caking agents such as calcium stearate, mold release agents, deodorants, bengara, iron sand, etc.
  • it can be appropriately blended in a predetermined amount.
  • the RCS for pig steel as described above is produced by various methods such as a dry hot coating method, a semi-hot coating method, a cold coating method, and a powder solvent method, which have been conventionally performed in the technical field. Can be produced. Among these, it is desirable to use a dry hot coating method in terms of productivity and quality.
  • preheated dredged sand is placed in a kneader such as a whirl mixer to adjust the temperature.
  • a phenolic resin for example, novolak-type phenol resin
  • potassium nitrate, vinsol, and other necessary additives are supplied in a predetermined amount into a kneader and melted and kneaded for a predetermined time to form a lump.
  • an aqueous hexamine solution is added with stirring and mixing, and the lumps are broken into sand particles by cooling with air blowing, and then calcium stearate is added and kneaded.
  • the RCS for steel according to the present embodiment as described above can be obtained.
  • potassium nitrate it is preferable to use it as an aqueous solution having an appropriate concentration, for example, an aqueous solution having a concentration of about 10 to 50% by weight, from the viewpoint of safety during handling.
  • the saddle mold of this embodiment can heat the saddle mold itself during fabrication because it contains potassium nitrate.
  • the steel mold is not limited to the core as described above, but can be formed as a main mold.
  • the specific molding conditions of the saddle are not particularly limited, and can be appropriately selected according to the usage conditions of the saddle.
  • such ⁇ for ⁇ for example configured to be hot strength force 12 0 ⁇ 175N / cm 2 of ⁇ during ⁇ .
  • the steel mold retains the shape of the steel mold when pouring molten steel, and stably produces steel products having a desired shape. Can be built.
  • the cold strength of the saddle type for steel is configured to be 900 to 1400 NZcm 2 , preferably 1000 to 1360 N / cm 2 . If the cold strength of the saddle is less than 900 N / cm 2 , baling tends to occur in the steel during forging. On the other hand, if the cold strength exceeds 140 ON / cm 2 , gas defects are likely to occur in the porridge.
  • the steel product forged using the steel mold as described above has a thickness of 6 to 15 mm and a surface area of 1000 cm 2 or more.
  • the hot crack generated on the surface of the surface in contact with the vertical shape is 70 mm or less per surface area of 1000 cm 2 , resulting in excellent quality.
  • the occurrence of hot water wrinkles is effectively suppressed in such steelware, and for example, the hot water wrinkle generation state is excellent such that the grade classification based on JIS G 0588 shows the first or second class. Has a smooth skin.
  • RCS was shaped to a size of 30 ⁇ ⁇ X 50mm, and then fired at 250 ° C for 2 minutes to prepare two test pieces 1 (TP1).
  • TP1 was allowed to cool to room temperature, and its coercive pressure was measured as the cold strength.
  • the other TP1 was detonated at 1000 ° C for 1 minute, and the coercive pressure immediately after that was measured as the hot strength.
  • the coefficient of thermal expansion was measured according to JACT test method M-2. That is, TP 1 of 30 mm ⁇ X 50 mm was produced in the same manner as described above, and the length of TP 1 (TP length before heat exposure) was measured. Next, TP 1 was installed in a high-temperature dredged sand testing machine adjusted to a furnace temperature of 1000 ° C. Then, the TP length (TP length after heat exposure) was measured every predetermined time with the same test machine, and the thermal expansion coefficient at each time was calculated by the following formula based on the measurement result.
  • Thermal expansion coefficient (%) (TP length after heat exposure TP length before heat exposure) TP length before heat exposure Z 100 [0067] After shaping RCS to a size of 50 x 120 x 5 mm, it was fired at 250 ° C for 40 seconds to produce TP2. The obtained TP2 was fixed to the hot deflection measuring device 10 in a cantilever state as shown in FIG. Subsequently, a preheated heater H was inserted into the lower surface of TP2 to perform heat exposure, and the amount of displacement by which the free end of TP2 was displaced upward and the heat exposure time corresponding to the amount of displacement were measured.
  • the main mold 1 as shown in Fig. 2 was made by the green mold method using the sand.
  • Test piece core 2 was molded by shell molding using RCS.
  • the main mold 1 can be divided into an upper mold 3 and a lower mold 4 in the vertical direction, and a cylindrical space is formed inside.
  • the test piece core 2 was coaxially attached to the internal space of the main mold 1 obtained.
  • molten steel was peeled from the pouring gate 5 and poured into a cylindrical steel frame having a thickness of about 10 mm.
  • low-alloy steel product SCSiMn2 equivalent material was used as the molten steel, and the molten steel was cast at a casting temperature of 1550 ⁇ 10 ° C.
  • the steel product thus obtained was 35 kg in weight, and the surface area of the thin wall portion was 4260 cm 2 .
  • the obtained steel product was observed, and the hot cracks occurring in the steel product having the longest crack length were measured.
  • the detection of hot cracks was performed in accordance with the penetrant testing method specified in JIS Z 2343. Based on the measured crack length, hot cracks were evaluated in the following five stages. For the detected hot cracks, the crack length per 1000 cm 2 surface area of the steel frame was calculated.
  • Evaluation index for hot crack When the crack length is Omm (no hot crack), give an evaluation of "5". Below, the crack length is 100mm or less as “4", and over 100mm and 200mm or less as “ “3”, more than 200 mm and less than 300 mm were evaluated as “2”, and more than 300 mm were evaluated as “1”.
  • novolac resin B is a novolak type phenol resin, which is a product name ⁇ SP5000HS '' manufactured by Asahi Organic Materials Co., Ltd., which exhibits low expansibility.
  • BP150 a product name “BP150” manufactured by Asahi Organic Materials Co., Ltd., which is a novolac type phenolic resin that exhibits low expansibility.
  • kneaded sand was produced that was formed into a bowl by a room temperature self-curing method that was not a shell mold method.
  • 0.9 kg of domestic cinnabar sand and 2.1 kg of reclaimed sand are introduced into the laboratory supplies Kawakita Mixer, and 9 g of product name “E40” manufactured by Asahi Organic Materials Co., Ltd. is added as an organic ester curing agent.
  • the mixture was kneaded for 30 seconds.
  • 45 g of the prepared alkali resole rosin was added and kneaded for 30 seconds to obtain kneaded sand.
  • Each test piece having a predetermined shape can be produced by shaping the obtained kneaded sand and curing it at room temperature.
  • FIG. 3 (b) is a cross-sectional view taken along a plane perpendicular to the thickness direction of the bracket 11 shown in Fig. 3 (a), and Fig. 3 (c) is shown in Fig. 3 (a). It is II sectional drawing shown in FIG. The obtained bracket 11 had an average thickness of about 12 mm, and the surface area of the thin portion was 15200 cm 2 .
  • the main mold was formed by a green mold method. Furthermore, a structural low alloy steel SCSiMn2 equivalent material was injected as a molten steel into a vertical mold, and the molten metal injection temperature was set to 1550 ⁇ 10 ° C.
  • brackets 11 For each of the obtained brackets 11, a hot crack was detected in accordance with the penetration flaw detection test method defined in JIS Z 2343, and the length of the detected crack was measured. In addition, the occurrence ratio of cracks per surface area of 1000 cm 2 in the thin wall portion was calculated. In addition, the bracket The raw hot water wrinkles were evaluated based on the appearance test method and grade classification of steel products and skins specified in JIS G 0588.
  • Example 2 and Comparative Example 2 the medium-sized steel product 12 (frame) shown in FIG. 4 and the small steel product 13 (small bracket) shown in FIG. 5 were produced.
  • the medium-sized steel products shown in Fig. 4 carbon steel steel products for welded structures SCW450 equivalent material was used as the molten steel, and the injection temperature of the molten metal was set to 1550 ⁇ 10 ° C.
  • a structural low alloy steel SCSiMn2 equivalent material was used as the molten steel, and the pouring temperature of the molten metal was set to 1550 ⁇ 10 ° C.
  • the other production conditions for these medium and small steel products were the same as those for the large steel products.
  • the obtained medium-sized steel product 12 had an average thickness of about 11 mm, and the surface area of the thin-walled portion was 700,000 cm 2 .
  • This medium-sized steel product 12 is a component that is very difficult to repair when a hot crack occurs in the hollow interior.
  • three items were evaluated: hot crack length, crack generation rate per 1000 cm 2 of thin-walled surface area, and hot water wrinkle generation state. Went.
  • the small steel product 13 had an average thickness of about 12 mm, and the surface area of the thin portion was 2 160 cm 2 .
  • This small steel product was evaluated for two items: the length of hot cracks and the occurrence of hot water wrinkles.
  • Table 4 summarizes the results of evaluations conducted on the large, medium, and small steel products.
  • Example 2 hot cracks did not occur and generation of hot water wrinkles was effectively suppressed.
  • Comparative Example 2 the occurrence of hot cracks in the steel product was confirmed.
  • FIGS. 4 and 5 the positions where hot cracks occurred in the steel product in Comparative Example 2 are shown in FIGS. 4 and 5, respectively. From this result, it has been clarified that a special effect can be obtained by the present invention.
  • the present invention is effectively applied to the case where a steel mold is formed by using a shell mold method using RCS and a steel frame is forged using the same mold, particularly when a thin steel frame is forged. be able to.

Abstract

L'invention concerne un sable enduit de résine pour une utilisation pour de l'acier coulé, comprenant un sable de moulage, une résine phénolique en quantité comprise entre 2,5 et 5,0 % en poids par rapport à la quantité de sable de moulage, du nitrate de potassium, et du vinsole. L'invention concerne également un moulage en acier obtenu par coulage dans un moule fabriqué à partir du sable enduit de résine, ce procédé permettant de prévenir efficacement les cassures à chaud ou les rides à la surface du bain, même pour un article fin et de grande taille.
PCT/JP2006/314046 2005-07-15 2006-07-14 Sable enduit de resine pour une utilisation pour de l'acier coule, moule fabrique a partir de ce sable, et moulage d'acier moule en utilisant ce moule WO2007010848A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2006800257334A CN101222992B (zh) 2005-07-15 2006-07-14 铸钢用树脂覆膜砂、由该砂形成的铸型和由该铸型铸造的钢铸件
JP2007525990A JP4545192B2 (ja) 2005-07-15 2006-07-14 鋳鋼用レジンコーテッドサンド、同サンドからなる鋳型および同鋳型により鋳造された鋼鋳物

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Application Number Priority Date Filing Date Title
JP2005206838 2005-07-15
JP2005-206838 2005-07-15

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WO2007010848A1 true WO2007010848A1 (fr) 2007-01-25

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MX2019009314A (es) * 2017-02-10 2019-09-19 Asahi Yukizai Corp Composicion de material de molde y metodo para producir el molde utilizando la misma.
CN107214302A (zh) * 2017-05-18 2017-09-29 西峡县众德汽车部件有限公司 一种新型的铸件浇注方法
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