EP2022578A1 - Salzkern zum giessen - Google Patents

Salzkern zum giessen Download PDF

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Publication number
EP2022578A1
EP2022578A1 EP07743803A EP07743803A EP2022578A1 EP 2022578 A1 EP2022578 A1 EP 2022578A1 EP 07743803 A EP07743803 A EP 07743803A EP 07743803 A EP07743803 A EP 07743803A EP 2022578 A1 EP2022578 A1 EP 2022578A1
Authority
EP
European Patent Office
Prior art keywords
ions
expendable
mol
salt core
salt
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07743803A
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English (en)
French (fr)
Other versions
EP2022578A4 (de
Inventor
Jun Yaokawa
Koichi Anzai
Youji Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku University NUC
Yamaha Motor Co Ltd
Original Assignee
Tohoku University NUC
Yamaha Motor Co 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
Publication date
Application filed by Tohoku University NUC, Yamaha Motor Co Ltd filed Critical Tohoku University NUC
Publication of EP2022578A1 publication Critical patent/EP2022578A1/de
Publication of EP2022578A4 publication Critical patent/EP2022578A4/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores

Definitions

  • the present invention relates to a water soluble expendable salt core for casting.
  • casting such as aluminum high pressure die casting (HPDC) is a technique that injects a molten aluminum alloy into a metal mold at high speed under a high pressure to cast a near-net-shape structure.
  • HPDC high pressure die casting
  • an expendable core is used.
  • the expendable core used in such a case must have a strength that can withstand a high pressure and high temperature because it may be subject to a large impact or impulse force fluctuation upon collision of a molten metal injected from the gate at high speed mold filling and because a high static compressive casting pressure is applied until solidification completion.
  • the expendable core is removed from the cast product.
  • the cast product has a complicated internal structure, if a generally used phenol resin bonded sand core is used as the expendable core, it is not easy to remove.
  • a water soluble expendable salt core is available as the expendable core that can be removed by dissolution with, e.g., high-temperature water (reference 1: Japanese Patent Laid-Open No. 48-039696 , reference 2: Japanese Patent Laid-Open No. 50-136225 , and reference 3: Japanese Patent Laid-Open No. 52-010803 ).
  • the expendable salt core as described above is formed by using a salt mixture of, e.g., sodium carbonate (Na 2 CO 3 ), potassium chloride (KCl), and sodium chloride (NaCl), melting these components, and molding.
  • a salt mixture of, e.g., sodium carbonate (Na 2 CO 3 ), potassium chloride (KCl), and sodium chloride (NaCl) melting these components, and molding.
  • an expendable fused salt core is formed by melting a salt and casting, however, the formation of a shrinkage cavity, micro-porosity, small heat crack, and the like would be caused in the salt core due to a change in volume such as solidification shrinkage occurring in the solidification process. It is therefore not easy to mold the expendable fused salt core conforming to the mold precisely. In this manner, with the prior art, an expendable fused salt core cannot be manufactured easily by casting using a molten salt.
  • the present invention has been made to solve the above problems, and has as its object to facilitate manufacture of a water soluble expendable salt core for casting which is formed of a salt cast product obtained by molding after melting salts such as sodium and potassium and has a sufficient strength.
  • An expendable salt core for casting according to the present invention is formed of a molten salt containing bromine ions, carbonate ions, and at least one of sodium ions and potassium ions.
  • the molten salt is preferably formed of sodium ions, bromine ions, and carbonate ions.
  • the molar ratio of carbonate ions in all the anions is preferably 30 mol%.
  • the molar ratio of carbonate ions in all the anions is preferably 50 mol% to 80 mol%.
  • the molten salt may be formed of potassium ions, bromine ions, and carbonate ions, and the molar ratio of carbonate ions in all the anions may be 30 mol%, or 50 mol% to 90 mol%.
  • the molten salt may be formed of sodium ions, potassium ions, bromine ions, and carbonate ions.
  • the melting temperature of the molten salt may fall within a range of 600°C to 680°C.
  • the molar ratio of potassium ions in all the cations may be 50 mol% to 90 mol%, and the molar ratio of carbonate ions in all the anions may be 40 mol% to 80 mol%.
  • a plurality of granular crystals are preferably formed in the parent phase in a dispersed state.
  • the granular crystals are preferably formed of carbonate ions and at least one of sodium ions and potassium ions.
  • the expendable salt core for casting is formed of a molten salt containing at least one of sodium ions and potassium ions, bromine ions, and carbonate ions.
  • a water soluble expendable salt core for casting which is formed of a salt cast product obtained by melting and molding salts such as sodium and potassium can be manufactured easily to have a sufficient strength.
  • Fig. 1 is a partially cutaway perspective view of a closed-deck type cylinder block which is cast using the expendable salt core for casting according to the present invention.
  • reference numeral 1 denotes a closed-deck type cylinder block which is made of an aluminum alloy and cast using an expendable salt core 2 as an expendable salt core for casting according to the present invention.
  • the cylinder block 1 is part of a water cooling 4-cycle 4-cylinder engine for a motorcycle which is molded into a predetermined shape by high pressure die casting (HPDC).
  • the cylinder block 1 shown in Fig. 1 integrally has four cylinder bores 3, a cylinder body 4 having the cylinder bores 3, and an upper crank case 5 extending downward from the lower end of the cylinder body 4.
  • a lower crank case (not shown) is attached to the lower end of the upper crank case 5.
  • the upper crank case 5, together with the lower crank case, rotatably, axially supports a crank shaft (not shown) through a bearing.
  • the cylinder body 4 is a so-called closed-deck-type cylinder body, and has a water jacket 6 which is formed in it using the expendable salt core 2.
  • the water jacket 6 is formed to include a cooling water passage forming portion 7, cooling water inlet port 8, main cooling water passage 9, and communication passage 10.
  • the cooling water passage forming portion 7 projects on one side of the cylinder body 4 and extends in the direction in which the cylinder bores 3 line up.
  • the cooling water inlet port 8 is formed in the cooling water passage forming portion 7.
  • the main cooling water passage 9 is formed to communicate with a cooling water distribution passage (not shown) formed in the cooling water passage forming portion 7 and cover all the cylinder bores 3.
  • the communication passage 10 extends upward in Fig. 1 from the main cooling water passage 9 and opens to a mating surface 4a with respect to a cylinder head (not shown) at the upper end of the cylinder body 4.
  • the water jacket 6 described above supplies cooling water flowing in from the cooling water inlet port 8 to the main cooling water passage 9 around the cylinder bores through the cooling water distribution passage, and guides the cooling water from the main cooling water passage 9 to a cooling water passage in the cylinder head (not shown) through the communication passage 10. Since the water jacket 6 is formed in this manner, the cylinder body 4 is covered with the ceiling wall (the wall that forms the mating surface 4a) of the cylinder body 4 except that the communication passage 10 of the water jacket 6 opens to the mating surface 4a at the upper end to which the cylinder head is connected. Hence, a closed-deck-type arrangement is formed.
  • the expendable salt core 2 to form the water jacket 6 has a shape identical to that obtained by integrally connecting the respective portions of the water jacket 6.
  • the cylinder body 4 is partly cut away to facilitate understanding of the shape of the expendable salt core 2 (the shape of the water jacket 6).
  • the expendable salt core 2 is formed from a molten salt obtained by melting a salt mixture of a salt of bromine and at least one of sodium and potassium and a salt of carbonic acid and at least one of sodium and potassium.
  • the expendable salt core 2 is formed into the shape of the water jacket 6 by, e.g., die casting.
  • the components of the expendable salt core 2 will be described later in detail.
  • the expendable salt core 2 can be formed by a casting method other than die casting, e.g., gravity casting.
  • a mixture consisting of a plurality of salts (to be described later) is melted by heating to obtain a melt. Then, the melt is injected into an expendable salt core forming metal mold under a high pressure and solidified. After solidification, the obtained expendable salt core 2 is taken out from the mold.
  • the passage forming portion 2a which forms the cooling water inlet port 8 and the cooling water distribution passage, an annular portion 2b which surrounds the four cylinder bores 3, and a plurality of projections 2c extending upward from the annular portion 2b are formed integrally.
  • the projections 2c form the communication passage 10 of the water jacket 6.
  • the expendable salt core 2 is supported at a predetermined position in the metal mold (not shown) by a core print (not shown) during casting, and is removed by dissolution with hot water or vapor after casting.
  • the cylinder block 1 may be dipped in a dissolution tank (not shown) which contains dissolving liquid consisting of, e.g., hydrochloric acid and hot water.
  • dissolving liquid consisting of, e.g., hydrochloric acid and hot water.
  • the passage forming portion 2a and the projections 2c exposed to the mating surface 4a, of the expendable salt core 2 come into contact with the dissolving liquid and dissolve.
  • the dissolved portions expand gradually until all the portions dissolve finally.
  • hot water or vapor may be sprayed under a pressure from a hole.
  • a core print may be inserted in portions where the projections 2c are to be formed.
  • hydrochloric acid is used in the process of removing the expendable salt core 2 from the cylinder block 1 as a cast product, carbon dioxide gas foams.
  • the foam provides a stirring function and promotes dissolution effectively.
  • the expendable salt core 2 contains potassium carbonate and sodium carbonate, when it dissolves in water, the resultant water exhibits alkaline. This alkali state poses problems such as corrosion of the cylinder block 1 as an aluminum cast product. Regarding this problem, corrosion of the cylinder block can be prevented by adding hydrochloric acid to control pH to near 7.
  • the expendable salt core 2 will be described.
  • the expendable salt core 2 according to this embodiment is formed to at least contain at least one of potassium and sodium as cations and bromine as anions.
  • the expendable salt core 2 is formed of a molten salt of bromine ions and at least one of sodium ions and potassium ions.
  • the expendable salt core 2 is formed to also contain carbonic acid as anions.
  • the expendable salt core 2 is formed by casting using a melt (molten salt) obtained by melting a salt mixture of sodium bromide and sodium carbonate.
  • the expendable salt core 2 is formed by casting using a melt obtained by melting a salt mixture of potassium bromide and potassium carbonate.
  • the expendable salt core 2 is formed by casting a melt obtained by melting a salt mixture of potassium bromide and sodium carbonate.
  • the expendable salt core 2 is formed by casting a melt obtained by melting a salt mixture of sodium bromide and potassium carbonate.
  • the expendable salt core 2 is formed by casting using a melt obtained by melting a salt mixture of at least three members of potassium bromide, sodium bromide, sodium carbonate, and potassium carbonate.
  • the expendable salt core 2 is formed by casting using a melt obtained by melting a salt mixture of at least four members of potassium bromide, sodium bromide, sodium carbonate, and potassium carbonate.
  • the expendable salt core 2 may contain other ions.
  • the expendable salt core 2 main contain, in addition to bromine ions and carbonate ions as anions, other anions such as sulfuric acid ions, nitric acid ions, and chlorine ions.
  • the expendable salt core 2 may be manufactured by die casting which performs casting using a solid-liquid coexisting melt such as a semi-solidified melt.
  • a mixture (salt mixture) of the plurality of slats described above may be melted by heating to obtain a melt.
  • the temperature of the melt may be decreased to set the melt in the semi-solidified (solid-liquid coexisting) state.
  • the melt in the semi-solidified state may be injected into a metal mold for an expendable salt core under a high pressure and solidified. After solidification, the resultant product may be taken out from the metal mold, thus fabricating the expendable salt core 2.
  • the expendable salt core 2 (expendable salt core for casting) according to the embodiment described above employs a bromide.
  • a bromide When compared to an expendable salt core which is formed of chloride salts without using a bromide, the solidification shrinkage ratio is small, and shrinkage cavities do not form easily.
  • a bromide has a lower latent heat of fusion than a chloride. With the expendable salt core 2 containing bromine, a melting energy can be reduced more when compared to an expendable salt core that does not contain bromine.
  • a bromide has larger water solubility than a chloride.
  • the expendable salt core 2 containing bromine dissolves more in an equivalent amount of water than the expendable salt core not containing bromine, so that it can be removed more quickly.
  • a water soluble expendable salt core for casting formed of a salt cast product obtained by melting and molding salts such as sodium and potassium can be manufactured more easily.
  • Tables 1 and 2 and Fig. 2 show a change in bending strength (measurement value) occurring when the anionic ratio of bromine ions to carbonate ions is changed in an expendable salt core manufactured by melting a salt mixture of sodium bromide and sodium carbonate. This refers to cases in which the molten salt to form the expendable salt core is formed of sodium ions, bromine ions, and carbonate ions.
  • Table 1 shows the measurement results (maximum bending loads) of the bending strengths of the fabricated test pieces
  • Table 2 shows the measurement results (maximum bending strengths) of the bending strengths of the fabricated test pieces. Tables 1 and 2 are identical except that representations of the measurement results are different.
  • the concentration of each ion is measured according to the analysis method determined by the rules of ion chromatograph analysis of JIS standard K0127. As shown in Tables 1 and 2 and Fig. 2 , expendable salt cores in which a concentration YCO 3 2- of carbonate ions in all the cations is 30 mol% to 80 mol% exhibit high bending strengths exceeding a bending strength of 13.9 MPa. Particularly, expendable salt cores with YCO 3 2- of 50 mol% to 80 mol% exhibit higher bending strengths.
  • Tables 3 and 4 and Fig. 3 show a change in bending strength (measurement value) occurring when the anion ratio of bromine ions to carbonate ions is changed in an expendable salt core manufactured by melting a salt mixture of potassium bromide and potassium carbonate. This refers to cases in which the molten salt to form the expendable salt core is formed of potassium ions, bromine ions, and carbonate ions.
  • Table 3 shows the measurement results (maximum bending loads) of the bending strengths of the fabricated test pieces
  • Table 4 shows the measurement results (maximum bending strengths) of the bending strengths of the fabricated test pieces. Tables 3 and 4 are identical except that representations of the measurement results are different.
  • the concentration of each ion is measured according to the analysis method determined by the rules of ion chromatograph analysis of JIS standard K0127. As shown in Tables 3 and 4 and Fig. 3 , expendable salt cores in which the concentration YCO 3 2- of carbonate ions in all the cations is 60 mol% to 80 mol% exhibit high bending strengths exceeding a bending strength of 16.0 MPa.
  • Tables 5, 6, and 7 show a change in bending strength (measurement value) occurring when the anion ratio of bromine ions to carbonate ions is changed in an expendable salt core manufactured by melting a salt mixture of sodium bromide, potassium bromide, potassium carbonate, and sodium carbonate. This refers to cases in which the molten salt to form the expendable salt core is formed of sodium ions, potassium ions, bromine ions, and carbonate ions.
  • the following Tables 5, 6, and 7 show the measurement results (maximum bending strengths) of the bending strengths of the fabricated test pieces. The concentration of each ion is measured according to the analysis method determined by the rules of ion chromatograph analysis of JIS standard K0127, in the same manner as described above.
  • Fig. 4 shows the relationship (phase diagram of Na-K-Br-CO 3 system) among the cation ratio of potassium ions, the anionic ratio of carbonate ions, and the melting temperature (liquidus temperature). This corresponds to the results of the above Tables 2, 4, 5, 6, and 7.
  • the largest circles represent test pieces that exhibit an average bending strength exceeding 20 MPa.
  • the second largest circles represent test pieces that exhibit an average bending strength of 15 MPa to 20 MPa.
  • the third largest circles represent test pieces that exhibit an average bending strength of 10 MPa to 15 MPa.
  • the smallest circles represent test pieces that exhibit an average bending strength of 0 MPa to 10 MPa.
  • FIG. 4 also shows the liquidus temperature of NaBr when K + is 0 mol% and CO 3 2- is 0 mol%, the liquidus temperature of KBr when Na + is 0 mol% and CO 3 2- is 0 mol%, the liquidus temperature of Na 2 CO 3 when K + is 0 mol% and Br - is 0 mol%, and the liquidus temperature of K 2 CO 3 when Na + is 0 mol% and Br - is 0 mol%.
  • thick lines represent eutectic lines.
  • the melting temperature of the molten salt may be set to approximately 680°C at maximum.
  • Fig. 5 is an SEM photograph of the solidification structure of an expendable salt core fabricated using a molten salt in which the concentration of potassium ions in all the cations is 50 mol% and the concentration of carbonate ions in all the anions is 70 mol%.
  • the expendable salt core fabricated from the molten salt with this composition exhibits a bending strength of 20 MPa or more, as shown in Fig. 4 , thus providing a very high strength.
  • a state is observed in which a plurality of granular crystals are evenly dispersed in the parent phase.
  • the composition of the granular crystal portion observed in this manner was analyzed by an energy-dispersive X-ray spectroscopic analyzer.
  • the concentration of potassium ions in all the cations was 32 mol%, and the concentration of carbonate ions in all the anions was 100 mol%.
  • Fig. 6 is an SEM photograph of the solidification structure of an expendable salt core fabricated using a molten salt in which the concentration of potassium ions in all the cations is 60 mol% and the concentration of carbonate ions in all the anions is 70 mol%.
  • the expendable salt core fabricated from the molten salt with this composition exhibits a bending strength of 15 MPa to 20 MPa, as shown in Fig. 4 , thus providing a high strength.
  • this expendable salt core as shown in Fig. 6 , a state is observed in which a plurality of granular crystals are evenly dispersed in the parent phase.
  • the composition of the granular crystal portion observed in this manner was analyzed by the energy-dispersive X-ray spectroscopic analyzer.
  • the concentration of potassium ions in all the cations was 42 mol%, and the concentration of carbonate ions in all the anions was 100 mol%.
  • Fig. 7 is an SEM photograph of the solidification structure of an expendable salt core fabricated using a molten salt in which the concentration of potassium ions in all the cations is 40 mol% and the concentration of carbonate ions in all the anions is 70 mol%.
  • the expendable salt core fabricated from the molten salt with this composition exhibits a bending strength 0 MPa to 10 MPa, as shown in Fig. 4 , and does not provide a very high strength.
  • this expendable salt core as shown in Fig. 7 , comparatively large dendrites are observed in the parent phase.
  • the composition of the dendrite portion observed in this manner was analyzed by the energy-dispersive X-ray spectroscopic analyzer.
  • the concentration of potassium ions in all the cations was 22 mol%, and the concentration of carbonate ions in all the anions was 100 mol%.
  • a plurality of granular crystals need to be formed in the parent phase in a dispersed manner.
  • the granular crystals and dendrites observed by the SEM described above are crystals (primary crystals) which are formed first in the cooling process of the molten salt, and have comparatively high melting temperatures. After primary crystals are formed, the portion containing eutectic mixtures having a comparatively low melting point solidifies to form parent phase portions around the primary crystals. If the primary crystals formed in the parent phase of eutectic mixtures in this manner are not large dendrites but smaller granular crystals, the obtained expendable salt core may provide a high strength.
  • an expendable salt core formed of sodium ions, bromine ions, and carbonate ions and not containing potassium ions exhibits a high bending strength when the concentration of carbonate ions in all the anions is 30 mol% or falls between 50 mol% to 80 mol%.
  • concentration of carbonate ions is 60 mol%, a state is also observed in the solidification structure of the expendable salt core in which a plurality of granular crystals are dispersed in the parent phase.
  • NaBr is a fragile substance that causes cleavage fracture. With NaBr, only a low bending strength of less than 10 MPa is obtained, as described above. In contrast to this, when a carbonate is added to form the salt mixture, the solidified structure is formed of NaBr and Na 2 CO 3 , thus providing a higher bending strength.
  • An expendable salt core having a high strength can be obtained not only by simply adding a carbonate, but also by selecting a composition in which a crystal structure having a comparatively high melting point is formed in the parent phase having a comparatively low melting point. As primary crystals are mixed in the parent phase, progress of cracks and the like may be interfered with, providing a high strength. If the primary crystals are large dendrites, cracks tend to progress. If the primary crystals are smaller granular crystals, a higher strength can be obtained as described above.
  • a prismatic test piece with a predetermined size is fabricated. A load is applied to the test piece, and the bending load is obtained from the maximum load needed to break the test piece. Fabrication of the test piece will be described first.
  • a rod-like test piece 901 as shown in Figs. 9A and 9B is formed using a predetermined metal mold.
  • the employed metal mold is made of chrome molybdenum steel, e.g., SCM440H.
  • Fig. 9A also shows riser portions 902 used when charging the metal mold with a melt. In measurement of the bending strength, the portions 902 are cut off.
  • Fig. 9A is a side view
  • Fig. 9B is a sectional view taken at the position b - b in Fig. 9A .
  • the sizes indicated in Figs. 9A and 9B are design values of the metal mold.
  • the test piece 901 is supported by two support portions 1001 arranged at the center of the test piece 901 at a gap of 50 mm from each other.
  • two load portions 1002 at a gap of 10 mm from each other apply a load to the test piece 901.
  • the load to be applied to the test piece 901 is gradually increased.
  • the maximum load needed to break the test piece 901 was the bending load shown in Tables 1 and 3.
  • the test piece 901 is formed by pouring the melt into the metal mold, it is difficult to form a test piece having a shape completely coinciding with the size true to the mold due to flow marks or shrinkage cavity.
  • the present invention can be suitably used as a core in casting such as aluminum die casting.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
EP07743803.4A 2006-05-19 2007-05-21 Salzkern zum giessen Withdrawn EP2022578A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006140063 2006-05-19
PCT/JP2007/060369 WO2007136032A1 (ja) 2006-05-19 2007-05-21 鋳造用塩中子

Publications (2)

Publication Number Publication Date
EP2022578A1 true EP2022578A1 (de) 2009-02-11
EP2022578A4 EP2022578A4 (de) 2013-08-28

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EP07743803.4A Withdrawn EP2022578A4 (de) 2006-05-19 2007-05-21 Salzkern zum giessen

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US (1) US20090288797A1 (de)
EP (1) EP2022578A4 (de)
JP (1) JP4685934B2 (de)
WO (1) WO2007136032A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2586546A1 (de) * 2011-10-31 2013-05-01 Bühler AG Verfahren zur Herstellung von Salzkernen
DE102012022390B3 (de) * 2012-11-15 2014-04-03 Audi Ag Verfahren zur kalten Herstellung eines Salzkerns für das Druckgießen
CN103801671A (zh) * 2014-01-21 2014-05-21 北京交通大学 一种氧枪喷头毛坯的制造方法及模具
WO2014108419A1 (de) * 2013-01-09 2014-07-17 Emil Müller GmbH Mit salzschmelze infiltrierte salzkerne vorzugsweise für druckgussapplikationen

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Publication number Priority date Publication date Assignee Title
ITMI20120950A1 (it) 2012-06-01 2013-12-02 Flavio Mancini Metodo e impianto per ottenere getti pressofusi in leghe leggere con anime non metalliche
US8820389B1 (en) * 2012-10-31 2014-09-02 Brunswick Corporation Composite core for the casting of engine head decks
US9527131B1 (en) * 2013-12-20 2016-12-27 Brunswick Corporation Congruent melting salt alloys for use as salt cores in high pressure die casting
KR102478505B1 (ko) * 2016-12-23 2022-12-15 현대자동차주식회사 알루미늄 주조용 솔트코어 및 이의 제조방법
KR102215760B1 (ko) * 2017-01-19 2021-02-15 현대자동차주식회사 접합부의 강도가 향상된 고압주조용 솔트코어

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JPS5314618A (en) * 1976-07-28 1978-02-09 Hitachi Ltd Water soluble casting mould
WO2005028142A1 (ja) * 2003-09-17 2005-03-31 Yamaha Hatsudoki Kabushiki Kaisha 鋳造用中子

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JPS4839696A (de) 1971-09-27 1973-06-11
JPS5215446B2 (de) 1974-04-19 1977-04-30
JPS5210803A (en) 1975-07-12 1977-01-27 Inst Gorunogo Dera Akademii Na Device for retaining shank of cold chisel

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Publication number Priority date Publication date Assignee Title
US3501320A (en) * 1967-11-20 1970-03-17 Gen Motors Corp Die casting core
JPS5314618A (en) * 1976-07-28 1978-02-09 Hitachi Ltd Water soluble casting mould
WO2005028142A1 (ja) * 2003-09-17 2005-03-31 Yamaha Hatsudoki Kabushiki Kaisha 鋳造用中子

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2586546A1 (de) * 2011-10-31 2013-05-01 Bühler AG Verfahren zur Herstellung von Salzkernen
WO2013064304A1 (de) * 2011-10-31 2013-05-10 Bühler AG Verfahren zur herstellung von salzkernen
DE102012022390B3 (de) * 2012-11-15 2014-04-03 Audi Ag Verfahren zur kalten Herstellung eines Salzkerns für das Druckgießen
WO2014108419A1 (de) * 2013-01-09 2014-07-17 Emil Müller GmbH Mit salzschmelze infiltrierte salzkerne vorzugsweise für druckgussapplikationen
CN103801671A (zh) * 2014-01-21 2014-05-21 北京交通大学 一种氧枪喷头毛坯的制造方法及模具
CN103801671B (zh) * 2014-01-21 2016-07-13 北京交通大学 一种氧枪喷头毛坯的制造方法

Also Published As

Publication number Publication date
JP4685934B2 (ja) 2011-05-18
EP2022578A4 (de) 2013-08-28
JPWO2007136032A1 (ja) 2009-10-01
US20090288797A1 (en) 2009-11-26
WO2007136032A1 (ja) 2007-11-29

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