Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
  • B22D21/002—Castings of light metals
  • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C21/00—Alloys based on aluminium
  • C22C21/02—Alloys based on aluminium with silicon as the next major constituent

Definitions

• the present invention relates to an aluminum alloy for die casting with reduced casting cracks and an aluminum alloy die casting using the alloy.
• Aluminum alloys are widely used as component materials in automobiles, industrial machinery, aircraft, home appliances, and various other fields because of their properties such as light weight and excellent thermal conductivity and high corrosion resistance.
• One of them is the field of aluminum alloys for die casting, and a representative example thereof is ADC12 of an alloy for Al—Si—Cu based die casting specified in Japanese Industrial Standard JIS H5302.
• the ADC 12 is widely used for applications such as covers and cases such as carburetors, cylinder blocks, and cylinder head covers of automobiles, or die casting parts other than automobiles because of its good fluidity and filling property at the time of casting (die casting) It has
• ADC12 is widely used for die casting, but when the die cast to be cast is thin or depending on its shape, a phenomenon in which the die cast casted at the time of mold opening or product extrusion is broken, so-called "cast cracking" It can happen. If this casting crack occurs, the defect rate will increase, leading to an increase in cost, and in some cases, it will be necessary to change the product shape so that casting cracks are unlikely to occur, which results in a problem that the product shape will be restricted. There was.
• Patent Document 1 discloses Be (beryllium) in the Al-Si based aluminum alloy as 0. A technology for blending 0005 to 0.01% is disclosed.
• the formation of the aluminum oxide film on the surface of the molten aluminum alloy is suppressed, and the fluidity of the molten aluminum alloy is improved.
• the thin die casting can be easily manufactured.
• cost and labor are required to ensure the safety of workers when manufacturing aluminum alloys for die-casting, so aluminum alloys capable of manufacturing thin-walled die-casts can be efficiently used. There is a problem that it is difficult to manufacture economically.
• the main object of the present invention is an aluminum alloy for die-casting having seizing resistance, flowability and filling property while being hard to cause casting cracks and capable of thinning while being a highly safe and easy formulation. It is an object of the present invention to provide an aluminum alloy for die-casting which has a high degree of freedom in product shape and mechanical characteristics equivalent to those of ADC 12 and an aluminum alloy die-cast made of the alloy.
• the compounding ratio of Mg which is considered to have the largest influence on the casting cracking is suppressed to 0.09 wt% or less, the casting cracking is less likely to occur, while the strength decreased by the Mg reduction is It compensates by adding 0.20 weight% or more and 1.50 weight% or less of Cu.
• Si is incorporated in an amount of 6.0% by weight or more and less than 10.0% by weight, the fluidity of the molten aluminum alloy can be improved while suppressing the occurrence of casting cracks, and the upper limit of Fe is 1.0.
• Mn at an upper limit of 0.45 wt% and Cr at an upper limit of 0.50 wt% seizure can be prevented while maintaining an appropriate melting temperature.
• an ingot of an aluminum alloy for die-casting which is resistant to casting cracking and at the same time has seizure resistance, fluidity and filling property only by blending six kinds of elemental components in a predetermined ratio. It can be manufactured safely and easily.
• a second invention of the present invention is an aluminum alloy die cast made by die casting of the aluminum alloy for die casting according to the first invention.
• the aluminum alloy die cast by the die casting aluminum alloy according to the first invention of the present invention is less likely to cause casting cracks, so that thin articles can be mass-produced with good castability, and it has mechanical properties substantially equivalent to that of ADC12. For example, it can be applied to a wide range of applications such as automobile parts, optical parts, industrial machine parts, household appliances and the like.
• the present invention is a highly safe and easy-to-use aluminum alloy for die-casting which has both seizure resistance and fluidity / fillability while being difficult to cause casting cracks and capable of being thinned while being a simple formulation. It is possible to provide an aluminum alloy for die casting having a high degree of freedom in product shape and mechanical characteristics equivalent to that of the ADC 12, and an aluminum alloy die cast from the alloy.
• the aluminum alloy for die casting according to the present invention (hereinafter, also simply referred to as "aluminum alloy”) is mainly 0.20 wt% or more and 1.50 wt% or less of Cu (copper), 6.0 wt% or more Less than 10.0 wt% Si (silicon; silicon), 0.09 wt% or less Mg (magnesium), 1.0 wt% or less Fe (iron), 0.45 wt% or less Mn (manganese) and It contains 0.50% by weight or less of Cr (chromium), and the balance is composed of Al (aluminum) and unavoidable impurities.
• aluminum alloy is mainly 0.20 wt% or more and 1.50 wt% or less of Cu (copper), 6.0 wt% or more Less than 10.0 wt% Si (silicon; silicon), 0.09 wt% or less Mg (magnesium), 1.0 wt% or less Fe (iron), 0.45 wt% or
• Cu copper
• Mg which has the largest influence on the casting cracking
• the blending ratio of Cu with respect to the weight of the entire aluminum alloy is preferably in the range of 0.20 wt% or more and 1.50 wt% or less.
• the strength improvement effect by the blending of Cu is not sufficiently recognized, and conversely, when the blending ratio of Cu is more than 1.50 wt%, the strength improves Although the effect is remarkable, it is because casting cracks become a concern.
• Si silicon (silicon; silicon) is for improving the flowability and the filling property to the mold when the aluminum alloy is melted and pressure-casted.
• the compounding ratio of Si with respect to the weight of the whole aluminum alloy is in the range of 6.0% by weight or more and less than 10.0% by weight as described above.
• the blending ratio of Si is less than 6.0% by weight, the melting temperature and the casting temperature of the aluminum alloy become high, and the fluidity at the time of melting the aluminum alloy is lowered, so that the fluidity is sufficient at the time of die casting
• the blending ratio of Si is 10.0% by weight or more, the fluidity at the time of melting of the aluminum alloy is sufficient, but casting cracks easily occur.
• Mg manganesium
• Mg 2 Si is mainly present in the form of a solid solution in an Al base material in an aluminum alloy or as Mg 2 Si and imparts a yield strength and a tensile strength to the aluminum alloy while having the greatest effect on casting cracks. It is an ingredient to exert.
• the compounding ratio of Mg with respect to the weight of the whole aluminum alloy is 0.09 weight% or less range as mentioned above. If the blending ratio of Mg is more than 0.09% by weight, the casting cracks are likely to occur rapidly.
• Fe iron
• this Fe crystallizes needle-like crystals consisting of Al-Si-Fe, and reduces the toughness of the aluminum alloy, and when added in large amounts, makes it difficult to melt at an appropriate temperature. Therefore, in the present invention, the content of Fe is suppressed to 1.0% by weight or less based on the weight of the entire aluminum alloy.
• Mn manganese
• Mn manganese
• the Mn content is suppressed to 0.45% by weight or less based on the weight of the entire aluminum alloy.
• Al having a high Mn content such as aluminum can recovery material Mn-based scrap can be used as part of the alloy material.
• Cr chromium
• Cr is present mainly in the molten state when the aluminum alloy is in a molten state, and in the solid state it exists in a solid solution state in the Al phase or in a crystallized state as a Cr compound, Similarly, it is for preventing seizing between the aluminum alloy and the die at the time of die casting.
• Cr also makes it difficult to melt at a suitable temperature if added in large amounts, so in the present invention, the content of Cr is 0.50% by weight or less based on the weight of the entire aluminum alloy. I'm holding back.
• the total of the blending ratio of Fe, Mn, and Cr is 0.40% by weight or more based on the weight of the entire alloy. And preferably in the range of 1.95% by weight or less, more preferably in the range of 0.50% by weight or more and 1.95% by weight or less.
• the blending ratio of Cu, Si, Mg, Fe, Mn and Cr is adjusted according to the above blending ratio, although it is a simple and highly safe formulation, casting cracking is unlikely to occur and thinning is possible, and at the same time seizure resistance It is possible to obtain an aluminum alloy base metal for die-casting that has both the properties, flowability and filling properties.
• At least one selected from Na (sodium), Sr (strontium), Ca (calcium) and Sb (antimony) may be added as the improvement treatment material.
• an improvement treatment material particles of eutectic Si can be made finer, and the toughness and strength of the aluminum alloy can be further improved.
• At least one of Ti (titanium) and B (boron) may be added in place of the above-mentioned improved treatment material or together with the improved treatment material.
• Ti and B titanium
• the crystal grains of the aluminum alloy can be refined, and the elongation of the alloy can be improved. Such an effect is remarkable particularly when the amount of Si is small.
• raw materials are prepared in which the respective elemental components of Al, Cu, Si, Mg, Fe, Mn, and Cr have the above-described predetermined ratio. Subsequently, the raw material is put into a melting furnace such as a forging furnace-containing melting furnace or a closed melting furnace to melt these materials.
• the molten raw material thus melted that is, the molten metal of the aluminum alloy, is subjected to a purification treatment such as dehydrogenation treatment and removal treatment, if necessary.
• the refined molten metal is poured into a predetermined mold or the like and solidified to form a molten metal of an aluminum alloy into an alloy base metal ingot or the like.
• solution treatment, aging treatment and the like are performed as needed.
• the mechanical properties of the aluminum alloy casting can be improved by subjecting the aluminum alloy die cast to solution treatment, aging treatment and the like.
• Example 1 0.21% by weight of Cu, 7.88% by weight of Si, 0.04% by weight of Mg, 0.22% by weight of Fe, and 0% of Mn .04% by weight, 0.36% by weight of Cr and the balance being Al and unavoidable impurities, a molten metal is prepared to be within the range of the elemental composition of the aluminum alloy for die casting in the present invention did.
• this molten metal was die-casted under the following conditions using a normal die-casting machine (DC 250 JMT manufactured by Toshiba Machine Co., Ltd.) having a clamping force of 250 tons, and the presence or absence of casting cracks was measured.
• DC 250 JMT manufactured by Toshiba Machine Co., Ltd.
• Example 2 0.92 wt% of Cu, 8.21 wt% of Si, 0.00 wt% of Mg, 0.14 wt% of Fe and 0 wt% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as Example 1 except that .00 wt% and the blending ratio of Cr was 0.37 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• the mechanical characteristic it measured using the board
• Example 3 0.70% by weight of Cu, 7.02% by weight of Si, 0.01% by weight of Mg, 0.86% by weight of Fe, and 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that 21 wt% and the blending ratio of Cr was 0.00 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 4 The blending ratio of Cu is 0.72 wt%, the blending ratio of Si is 7.75 wt%, the blending ratio of Mg is 0.01 wt%, the existing ratio of Fe is 0.82 wt%, the blending ratio of Mn is 0
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that 42 wt% and the blending ratio of Cr was 0.00 wt%.
• the cast cracking incidence (%) of the obtained sample is shown in Table 1.
• Example 5 1.03% by weight of Cu, 6.15% by weight of Si, 0.01% by weight of Mg, 0.84% by weight of Fe, and 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as Example 1 except that 34 wt% and the blending ratio of Cr was 0.00 wt%.
• the cast cracking incidence (%) of the obtained sample is shown in Table 1.
• Example 6 1.05% by weight of Cu, 6.91% by weight of Si, 0.01% by weight of Mg, 0.86% by weight of Fe, and 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that 21 wt% and the blending ratio of Cr was 0.00 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 7 The blending ratio of Cu is 1.11 wt%, the blending ratio of Si is 6.92 wt%, the blending ratio of Mg is 0.04 wt%, the existing ratio of Fe is 0.84 wt%, the blending ratio of Mn is 0
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that the blending ratio of Cr was set to 0.00 wt%, and 20 wt%.
• the cast cracking incidence (%) of the obtained sample is shown in Table 1.
• Example 8 The blending ratio of Cu is 1.13 wt%, the blending ratio of Si is 6.97 wt%, the blending ratio of Mg is 0.07 wt%, the existing ratio of Fe is 0.85 wt%, the blending ratio of Mn is 0
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that the blending ratio of Cr was set to 0.00 wt%, and 20 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 9 The blending ratio of Cu is 1.13 wt%, the blending ratio of Si is 6.99 wt%, the blending ratio of Mg is 0.05 wt%, the existing ratio of Fe is 0.85 wt%, the blending ratio of Mn is 0
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that the blending ratio of Cr was set to 0.00 wt%, and 20 wt%.
• the cast cracking incidence (%) of the obtained sample is shown in Table 1.
• Example 10 The mixing ratio of Cu is 1.32% by weight, the mixing ratio of Si is 7.75% by weight, the mixing ratio of Mg is 0.01% by weight, the existing ratio of Fe is 0.82% by weight, the mixing ratio of Mn is 0
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that 43 wt% and the blending ratio of Cr was 0.00 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 11 0.53% by weight of Cu, 7.91% by weight of Si, 0.09% by weight of Mg, 0.39% by weight of Fe, 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that .09 wt% and the blending ratio of Cr was 0.34 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 12 0.54% by weight of Cu, 9.94% by weight of Si, 0.00% by weight of Mg, 0.11% by weight of Fe, and 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as Example 1 except that .00 wt% and the blending ratio of Cr was 0.30 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 13 0.54% by weight of Cu, 9.98% by weight of Si, 0.00% by weight of Mg, 0.28% by weight of Fe, and 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as Example 1 except that .00 wt% and the blending ratio of Cr was 0.30 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 14 0.54% by weight of Cu, 9.98% by weight of Si, 0.00% by weight of Mg, 0.44% by weight of Fe, and 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that .00 wt% and the blending ratio of Cr was 0.29 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Example 15 0.51% by weight of Cu, 7.55% by weight of Si, 0.00% by weight of Mg, 0.45% by weight of Fe, and 0% of Mn
• a sample of aluminum alloy die casting was produced under the same conditions as in Example 1 except that .00 wt% and the blending ratio of Cr was 0.33 wt%.
• the cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 1.
• Comparative Example 1 The mixing ratio of Cu is 0.53% by weight, the mixing ratio of Si is 10.0% by weight, the mixing ratio of Mg is 0.00% by weight, the existing ratio of Fe is 0.68% by weight, the mixing ratio of Mn is 0 .01% by weight, 0.30% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that it was prepared to be outside the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) of the obtained sample is shown in Table 2.
• Comparative Example 2 0.00 wt% of Cu, 12.6 wt% of Si, 0.00 wt% of Mg, 0.12 wt% of Fe, and 0 of Mn .01% by weight, 0.39% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that the composition is made out of the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) of the obtained sample is shown in Table 2.
• Comparative Example 3 0.01% by weight of Cu, 7.95% by weight of Si, 0.15% by weight of Mg, 0.92% by weight of Fe, and 0% of Mn .01 wt%, the blending ratio of Cr is 0.27 wt%, and the remainder is Al inevitable impurities and unavoidable impurities, except that it is prepared to be outside the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) of the obtained sample is shown in Table 2.
• Comparative Example 4 0.93% by weight of Cu, 8.07% by weight of Si, 0.15% by weight of Mg, 0.73% by weight of Fe, and 0% of Mn .20% by weight, 0.31% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that the composition is made out of the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) of the obtained sample is shown in Table 2.
• Comparative Example 5 1.02% by weight of Cu, 8.20% by weight of Si, 0.23% by weight of Mg, 0.90% by weight of Fe, and 0% of Mn .17% by weight, 0.07% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that it was prepared to be outside the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) of the obtained sample is shown in Table 2.
• Comparative Example 6 The mixing ratio of Cu is 1.14% by weight, the mixing ratio of Si is 7.03% by weight, the mixing ratio of Mg is 0.13% by weight, the existing ratio of Fe is 0.86% by weight, the mixing ratio of Mn is 0 .20% by weight, 0.00% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that the composition is made out of the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) of the obtained sample is shown in Table 2.
• Comparative Example 7 The mixing ratio of Cu is 1.28% by weight, the mixing ratio of Si is 8.13% by weight, the mixing ratio of Mg is 0.22% by weight, the existing ratio of Fe is 0.90% by weight, the mixing ratio of Mn is 0 . 18% by weight, 0.07% by weight of Cr and the remainder being Al unavoidable impurities and unavoidable impurities, except that it was prepared to be outside the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) of the obtained sample is shown in Table 2.
• Comparative Example 8 The mixing ratio of Cu is 1.89% by weight, the mixing ratio of Si is 10.7% by weight, the mixing ratio of Mg is 0.23% by weight, the existing ratio of Fe is 0.87% by weight, the mixing ratio of Mn is 0 . 19% by weight, 0.07% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that it is prepared to become ADC12 out of the range of the aluminum alloy element composition in the present invention
• the sample of the aluminum alloy die-cast was produced on the same conditions as Example 1. The cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 2.
• Comparative Example 9 0.00 wt% of Cu, 7.87 wt% of Si, 0.00 wt% of Mg, 0.29 wt% of Fe, and 0 of Mn .00% by weight, 0.37% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that it was prepared to be outside the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 2.
• Comparative Example 10 The mixing ratio of Cu is 1.87% by weight, the mixing ratio of Si is 8.15% by weight, the mixing ratio of Mg is 0.23% by weight, the existing ratio of Fe is 0.89% by weight, the mixing ratio of Mn is 0 .19% by weight, 0.07% by weight of Cr, and the remainder as Al unavoidable impurities and unavoidable impurities, except that the composition is made out of the range of the elemental composition of the aluminum alloy in the present invention Under the same conditions as in Example 1, samples of aluminum alloy die casting were produced. The cast cracking incidence (%) and mechanical properties of the obtained sample are shown in Table 2.
• the mechanical properties measured in the examples have tensile strength and elongation approximately equal to or higher than that of the ADC 12.

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• 2013
  • 2013-02-12 WO PCT/JP2013/000748 patent/WO2013150700A1/fr not_active Ceased
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