Classifications

• • 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
  • B22D21/005—Castings of light metals with high melting point, e.g. Be 1280 degrees C, Ti 1725 degrees C
• • 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
• • 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
  • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
  • B22C1/04—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for protection of the casting, e.g. against decarbonisation
  • B22C1/06—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for protection of the casting, e.g. against decarbonisation for casting extremely oxidisable metals
• • 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
  • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
  • B22C1/08—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for decreasing shrinkage of the mould, e.g. for investment casting
• • 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
  • B22C1/18—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 inorganic agents
  • B22C1/186—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 inorganic agents contaming ammonium or metal silicates, silica sols
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22C—FOUNDRY MOULDING
  • B22C9/00—Moulds or cores; Moulding processes
  • B22C9/02—Sand moulds or like moulds for shaped castings
  • B22C9/04—Use of lost patterns
• • 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
  • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere

Definitions

• the present invention relates to a mold used for manufacturing a titanium aluminum alloy or a titanium alloy forged product, a method for producing the mold, and a forged product using the mold.
• a titanium-aluminum alloy composed of titanium aluminide (TiAl), which is an intermetallic compound of Ti and A1, has characteristics such as light weight and high strength. For this reason, titanium aluminum alloys are promising for turbochargers for automobile engines, rotating members for gas turbine engines or aircraft jet engines, and the like.
• Titanium alloys have good corrosion resistance, are lightweight, and are biocompatible, and are widely used in automobiles, motorcycles, sports, leisure goods, artificial bones, and artificial teeth. It is used.
• Patent Document 1 Japanese Patent Laid-Open No. 5-123820
• Patent Document 2 Japanese Patent Laid-Open No. 2003-225738
• Patent Document 3 JP-A-5-277624
• Patent Document 4 JP-A-6-292940
• the titanium aluminum alloy and the titanium alloy have high activity, it is necessary to consider the reaction of the molten alloy with the soot type. In particular, it is important to suppress the reaction of the titanium aluminum alloy because it has a higher reactivity to the saddle than the titanium alloy. This is because Ti and A1 are both active metals, and the force A1 is more active than cocoon, and the titanium aluminum alloy generally has a higher melting point than the titanium alloy.
• Zircoyu sol is expensive for industrial use as a binder and has low strength near room temperature, and therefore requires a different type of binder to maintain room temperature strength.
• organic binders are decomposed at high temperatures, a different type of binder is required to maintain high temperature strength, resulting in an increase in vertical cost.
• An object of the present invention created in view of the above circumstances is to provide an inexpensive mold, a method for manufacturing the mold, and a forged product using the mold, which has little reaction with the molten alloy. is there.
• the saddle mold according to the present invention is a saddle mold for producing a titanium aluminum alloy or a titanium alloy forged product
• At least the first layer on the cavity surface of the saddle-shaped body is made of a fired slurry made of aggregate composed mainly of cerium oxide and a binder composed mainly of silica sol.
• the initial layer and the second layer on the cavity surface of the bowl-shaped body are formed of a fired product of slurry.
• the saddle type is a shell type or a solid type.
• a saddle-shaped manufacturing method according to the present invention is a saddle-shaped manufacturing method for manufacturing a titanium aluminum alloy or a titanium alloy manufactured product
• An initial layer slurry composed of an aggregate mainly composed of cerium oxide and a binder composed mainly of silica sol is attached to the wax-type surface, which is a disappearance model, and dried to form an initial layer slurry film. Steps,
• step of forming the second-layer slurry film it is preferable to repeat the initial-layer slurry film forming step again.
• the saddle-shaped manufacturing method according to the present invention is a saddle-shaped manufacturing method for manufacturing a titanium aluminum alloy or a titanium alloy manufactured product
• An initial layer slurry composed of an aggregate mainly composed of cerium oxide and a binder mainly composed of silica sol is attached to the wax-type surface, which is a disappearance model, and dried to form a block of the initial layer slurry.
• the saddle-shaped manufacturing method according to the present invention is a saddle-shaped manufacturing method for manufacturing a titanium aluminum alloy or a titanium alloy manufactured product
• Aggregate mainly composed of cerium oxide and silica sol are mainly used on the wax-type surface that is the disappearance model.
• the initial layer slurry film forming step is repeated again to form a block block of the rear layer slurry around the two-layered initial layer slurry film. It is preferable.
• the titanium aluminum alloy forged product according to the present invention is formed by forging using the aforementioned shell mold or solid mold.
• the titanium alloy forged product according to the present invention is a titanium alloy forged product formed by using the above-described shell mold or solid mold, and the ⁇ case layer in the surface layer portion of the free-standing material.
• the layer thickness is less than 300 ⁇ m.
• FIG. 1 is a cross-sectional view of a wax mold used for manufacturing a saddle mold according to a preferred embodiment of the present invention.
• FIG. 2 is a diagram showing a state after forming a wax-type peripheral metal slurry film in a vertical manufacturing process according to a preferred embodiment of the present invention.
• FIG. 3 is a view showing a state after dewaxing in a vertical manufacturing process according to a preferred embodiment of the present invention.
• FIG. 4 is a cross-sectional view of a saddle type according to a preferred embodiment of the present invention.
• FIG. 5 is a view showing a state in which molten metal is poured into the bowl-shaped cavity of FIG. 4.
• FIG. 6 is a cross-sectional view of a forged product formed by forging using the saddle mold of FIG.
• FIG. 7 A cross-sectional view of a wax mold used for manufacturing a bowl according to another preferred embodiment of the present invention.
• FIG. 8 is a view showing a state after forming a slurry film around a wax mold in a saddle mold manufacturing process according to another preferred embodiment of the present invention.
• FIG. 9 is a view when a slurry block body is formed around a slurry film in a manufacturing process of a saddle mold according to another preferred embodiment of the present invention.
• FIG. 10 is a view showing a state after a slurry block body is formed in a saddle-shaped manufacturing process according to another preferred embodiment of the present invention.
• FIG. 11 is a view showing a state after dewaxing in a vertical manufacturing process according to another preferred embodiment of the present invention.
• FIG. 13 is a view showing a state in which molten metal is poured into the bowl-shaped cavity shown in FIG.
• FIG. 13 is a cross-sectional view of a forged product forged using the saddle mold of FIG.
• FIG. 15 is a plan view of a part of a titanium-aluminum alloy forged product formed by forging using a mold according to a preferred embodiment of the present invention.
• FIG. 16 is an enlarged view of a main part 16 of FIG.
• FIG. 18 is an enlarged view of a main part 18 of FIG.
• FIG. 19 is a cross-sectional view showing the state of adhesion between the wax type and the first layer slurry when the Z-binder ratio of the first layer slurry is 1.8.
• FIG. 20 is a cross-sectional view showing the state of adhesion between the wax type and the first layer slurry when the Z binder ratio of the first layer slurry is 2.0.
• FIG. 21 is a cross-sectional view showing the state of adhesion between the wax type and the first layer slurry when the Z-binder ratio of the first layer slurry is 3.0.
• Titanium formed by forging using a shell mold according to a preferred embodiment of the present invention It is a cross-sectional view of an alloy forged product.
• FIG. 23 is a cross-sectional observation view of a titanium alloy forged product forged using a conventional shell mold.
• FIG. 24 is a cross-sectional view of a titanium alloy forged product formed by forging using a solid mold according to another preferred embodiment of the present invention.
• FIG. 25 is a cross-sectional observation view of a titanium alloy forged product formed by using a conventional solid mold.
• colloidal silica (silica sol) is used as a binder in the forged molds for Ni-based alloys, Co-based alloys, and Fe-based alloys.
• Silica sol has the characteristics that it is chemically stable (low activity), industrially inexpensive, and has high room temperature strength over high temperatures.
• this silica sol has the property of reacting violently with titanium aluminum alloy or titanium alloy. For this reason, conventionally, it has been considered that silica sol cannot be used as a titanium-aluminum alloy or a vertical binder for titanium alloys.
• titanium aluminum alloy or a titanium-aluminum component for titanium alloy is adjusted, so that even if silica sol is used as a binder, titanium aluminum is used. It has been found that vigorous reaction with the alloy or titanium alloy does not occur.
• FIG. 4 shows a cross-sectional view of a bowl according to a preferred embodiment of the present invention.
• the saddle type (shell saddle type) 40 is at least the first layer of the surface (hereinafter referred to as the cavity surface) 43 facing the cavity 32 of the saddle type main body 41.
• the first layer 44a and the second layer 44b of the cavity surface 43 are two layers.
• a fired product of a slurry hereinafter referred to as a cerium oxide-silica sol fired product
• a cerium oxide-silica sol fired product composed of an aggregate and a binder containing silica sol as a main component.
• the vertical body 41 has a multilayer structure of an initial layer (outermost layer) 44a, a second layer 44b, a third layer 44c,.
• the fired slurry composing the third layer 44c and subsequent layers may be the same as or different from the fired cerium oxide-silica sol composing the first layer 44a and the second layer 44b.
• the third layer 44c and the subsequent layers are the same as the conventional cage as a fired product of a different kind of slurry of the cerium oxide silica sol (for example, zirconia, alumina, silica, mritite, zircon or yttria catalyst).
• a fired product of a slurry composed of an aggregate mainly composed of at least one selected from the above and a noda composed mainly of zircosol) is applicable.
• Most of the aggregate of the first layer for example, 75 wt% or more, preferably 80 wt% or more is cerium oxide, and the balance is selected from zirconia, alumina, silica, mullite, zircon or yttria. Consists of at least one acid.
• the aggregate may be composed only of cerium oxide (with cerium oxide strength of Sl00 wt%).
• the binder is, for example, 10 to 100 wt%, preferably 50 to 100 wt% of the entire silica sol (20 to 50% silica sol aqueous solution), and the balance is zircoyu sol, yttria sol, alumina sol, or an organic binder. Composed.
• At least the viscosity of the initial slurry is adjusted by the filler (gram) / binder (gram) ratio.
• the viscosity of the slurry is low, force that leaves the slurry on the saddle type (wax type 10 described later) or peeling will occur. As shown in FIG. 19, peeling occurs when the filler Z binder ratio is 1.8, and as shown in FIG. 20, peeling occurs when the filler / binder ratio is 2.0. As shown in FIG. 21, it was confirmed that when the filler Z binder ratio was 3.0, no peeling occurred and a uniform film was formed. Furthermore, if the viscosity of the slurry is too high, the slurry film will be too thick and it will take time to dry, or it will become uneven due to non-uniform drying, so the filler Z binder ratio is 4. Up to 0.
• the present invention is not particularly limited thereto.
• the bowl-shaped body 41 is A two-layer structure or a structure of four or more layers may be used.
• the first layer 44a and the second layer 44b are made of a fired product of cerium oxide-silica sol (same kind of material) will be described.
• the present invention is not limited to this.
• the thickness of the first layer 44a is sufficiently thick (for example, when the thickness of the first layer 44a is 500 / zm or more)
• only the first layer 44a is formed of an oxidized cerium-silica sol fired product.
• the second and subsequent layers are preferably made of the same material as a normal cage (for example, a fired product of slurry composed of an aggregate mainly composed of zirconium oxide and a binder mainly composed of zirconium sol).
• a slurry that has a lower filler Z binder ratio and lower viscosity than the first layer.
• a wax mold 10 having the same shape and size as a target precision forged product (see FIG. 6 described later) is prepared in advance.
• an initial layer slurry is applied around the wax mold 10, and then an initial layer stucco is applied, followed by drying to form an initial layer slurry film 24 a as shown in FIG. .
• the second layer stucco is applied and then dried to form the second layer slurry film 24b.
• the first-layer slurry and the second-layer slurry are the same type of slurry.
• the initial layer slurry film 24a and the second layer slurry film 24b have a two-layer structure of the initial layer slurry film 24a.
• the first layer slurry and the second layer slurry are mixed with, for example, 1 to 4 kg of noinda containing silica sol as a main component and 2 to 4 kg of aggregate containing cerium oxide as a main component.
• a force such as about # 60-160 mesh zircoure, alumina, silica, mullite, or yttria is selected. At least one kind can be used, but the particle size and material are not particularly limited.
• the method for attaching the slurry include an immersion method, a spraying method, and a coating method, but the immersion method is preferable.
• a third layer slurry is applied around the second layer slurry film 24b, followed by a third layer stucco application, followed by drying to form a third layer slurry film 24c.
• the process of forming the third and subsequent layers of the slurry film is appropriately repeated as necessary, whereby the entire slurry film is formed.
• the film thickness is controlled to a desired thickness.
• the third-layer slurry and the third-layer and subsequent slurries, and the third-layer stucco and the third-layer and subsequent stucco components are not particularly limited, and are commonly used as slurries and stuccos for shell cages. All are applicable.
• the saddle type precursor 30 has a cavity 32 inside a precursor body 31 composed of three layers of slurry films 24a, 24b, and 24c.
• the shell saddle mold 40 has a cavity 32 inside a saddle mold body 41 composed of three layers of an initial layer 44a, a second layer 44b, and a third layer 44c.
• a titanium aluminum alloy or a molten titanium alloy 50 is poured into the cavity 32 of the shell cage 40 to be poured. Thereafter, the shell mold 40 is cooled, so that the molten metal 50 is solidified and the fabrication is completed. As a result, a forged body is formed in the shell mold 40.
• the shell saddle mold 40 is immersed in a high-temperature alkaline bath or the like to dissolve and remove the shell, that is, the saddle mold body 41, and release the mold, as shown in FIG.
• the forged product 60 made of titanium alloy is obtained.
• a physical method for example, blast cleaning
• Blast cleaning may be any of sand blasting, shot blasting, and water jet (high pressure water spraying). You can also use shakeout as a physical method other than blast cleaning.
• the first layer 44a and the second layer 44b of the cavity surface 43 of the saddle-type main body 41 that are in direct contact with 0 are formed of a sintered product of cerium oxide-silica sol.
• cerium oxide used as a main component of the aggregate of the shell cage 40 is not particularly stable in comparison with zircoyu or yttria. This is clear from the comparison of free energy.
• cerium oxide exhibits excellent stability with respect to Ti, and can react directly with Ti or be reduced by a molten titanium aluminum alloy 50 poured into the cavity 32 of the shell-type 40. It is rarely done. The inventors focused on this property of cerium oxide. That is, by using cerium oxide as the main component of the aggregate of the vertical body 41, the molten aluminum 50 of the titanium aluminum alloy reacts with the vertical body 41 or is oxidized in the cavity 32. There is almost no fear.
• the silica sol used as the main component of the binder of the bowl-shaped main body 41 usually reacts violently with the molten metal 50 of the titanium aluminum alloy.
• the silica sol and the titanium aluminum alloy react violently even if silica sol is used as the binder.
• Silica sol is chemically stable (low activity), industrially inexpensive, and high in strength from room temperature to high temperature. By using silica sol, the strength of a single sol can be increased. Therefore, it is not necessary to use a different kind of organic binder as a binder.
• the acid-oxide of the titanium aluminum alloy and the silica sol and the titanium aluminum alloy Reaction can be reliably (or almost certainly) suppressed, the formation of a layer containing a large amount of oxygen on the surface of the forged product 60 is suppressed, and the vertical shape on the surface of the forged product 60 Adhesion (seizure) of the main body 41 is suppressed.
• titanium aluminum alloy forged product 150 formed by forging using shell mold 40 according to the present embodiment has the mold body seized on its surface. Most of my strength. That is, the titanium aluminum alloy manufactured product 150 had a beautiful surface appearance and a smooth surface. In contrast, as shown in Figs. In the titanium aluminum alloy forged product 160 formed by forging using zircoyu as a component and silica sol as the main component of the binder, a large number of seizures 161 of the vertical body occurred on the surface. That is, the titanium-aluminum alloy fabricated product 160 had a poor surface appearance and a rough surface, and had good surface properties and strength.
• the titanium-aluminum alloy forged product 150 formed by forging using the shell mold 40 according to the present embodiment has almost no seizure of the mold main body on its surface. Good surface properties can be obtained.
• the titanium-aluminum alloy forged product 150 has an average surface roughness of the freezing material of 200 ⁇ m or less, preferably 50 ⁇ m or less. Therefore, the titanium aluminum alloy forged product 150 has a sufficiently good surface property even if it is a free-standing material, and it is not necessary to perform surface finishing treatment such as chemical milling or mechanical cutting. Only a little finishing) For this reason, the titanium aluminum alloy forged product 150 can reduce the number of manufacturing steps as compared with the conventional titanium aluminum alloy forged product 160, thereby reducing the product cost and improving the productivity.
• the shell mold 40 according to the present embodiment can be manufactured only by changing the formation process of the initial layer slurry film 24a and the second layer slurry film 24b (or only the initial layer slurry film 24a). is there. For this reason, the shell mold 40 according to the present embodiment can be manufactured without drastically changing the existing conventional shell mold manufacturing line, which can suppress an increase in manufacturing cost. I'll do it.
• a hardened layer (oc case) containing a large amount of oxygen is generated in the surface layer portion of the forged product 60. Is suppressed.
• the layer thickness of the ⁇ case produced on the surface layer of the resulting fabricated product 60 is less than 300 m, preferably less than 250 ⁇ m.
• titanium alloy forged product 220 formed by forging using shell mold 40 according to the present embodiment has a case layer thickness of about 220 ⁇ m formed on the surface layer portion. m.
• a titanium alloy forged product 230 formed by forging using zirconia as the main component of the saddle-shaped aggregate and silica sol as the main component of the binder is produced in the ⁇
• the case layer thickness was about 500 m.
• the titanium alloy forged product 220 has an ⁇ -case layer thickness that is less than half that of the titanium alloy forged product 230. I understand.
• titanium alloy forged product 220 forged and formed using shell mold 40 according to the present embodiment is less likely to form a case in the surface layer portion, and thus compared with conventional titanium alloy forged product 230.
• the time required for surface treatment (chemical milling, mechanical cutting, etc.) is shortened.
• the productivity of the titanium alloy fabrication 220 can be improved, and the product cost of the titanium alloy fabrication 220 can be reduced.
• the material yield is improved and the titanium alloy forged product is improved. 2 20 Raw material cost can be reduced.
• the mold 40 according to the present embodiment is suitable for a mold for a precision forged product.
• a mold for a precision forged product for example, as a titanium aluminum alloy precision forged product, a turbocharger for an automobile engine, a gas turbine engine, or an aircraft Examples include jet engine rotating members and heat-resistant jigs.
• Titanium alloy precision forged products include automobiles, motorcycle parts, sports, leisure goods, artificial bones / artificial teeth, and heat exchange.
• FIG. 12 shows a cross-sectional view of a saddle type according to another preferred embodiment of the present invention.
• the saddle type (solid saddle type) 120 is at least the first layer of the cavity surface 123 of the saddle type body 121 (in FIG. 12, the first layer of the cavity surface 123 is the first layer).
• the bowl-shaped main body 121 includes a block-shaped main body portion 124 and a layer portion 125 that faces the cavity 112.
• the layer part 125 has a two-layer structure of an initial layer 44a and a second layer 44b.
• the slurry fired product constituting the main body 124 may be the same as or different from the cerium oxide silica fired product constituting the first layer 44a and the second layer 44b.
• the main body 124 is mainly made of a cerium oxide-silica sol fired product and a different kind of slurry fired product that is the same as a normal bowl (for example, at least one selected from Zirconium, alumina, silica, mullite, zircon or yttria force).
• a slurry fired product composed of aggregate as a component and noinda mainly composed of zircoyu sol is applicable.
• the cavity surface 123 of the bowl main body 121 in the shell bowl 120 according to the present embodiment. May have a single-layer structure or a structure of three or more layers.
• the thickness of the initial layer 44a in the solid mold 120 according to the present embodiment is sufficiently thick, only the initial layer 44a is formed of a fired product of acid-cerium-silica sol, and the second layer 44b The same material as the main body 124 may be used.
• a wax mold having the same shape and size as the target precision forged product (see FIG. 14 described later) is prepared in advance.
• the initial layer slurry is applied around the wax mold 70, and then the initial layer stucco coating is performed, followed by drying to form the initial layer slurry film 24a as shown in FIG. .
• the second layer stucco is applied and then dried to form the second layer slurry film 24b.
• the first-layer slurry and the second-layer slurry are the same type of slurry.
• the initial layer slurry film 24a and the second layer slurry film 24b have a two-layer structure of the initial layer slurry film 24a.
• the rear slurry 93 is injected into the space 92. Is done.
• This rear layer slurry 93 is naturally cured with time, and may contain an organic compound (for example, phenol resin), a curing agent, a refractory material, and the like as appropriate. Due to the natural hardness of the rear layer slurry 93, a block body 103 of the rear layer slurry 93 is formed around the wax mold 70 provided with the slurry films 24a and 24b as shown in FIG.
• the saddle type precursor 110 has a cavity 112 inside the precursor body 111.
• the precursor main body 111 includes a block body 103 which is a main body portion and slurry films 24a and 24b facing the cavity 112.
• the saddle type precursor 110 according to the present embodiment is obtained by subjecting this saddle type precursor 110 to a firing treatment, as shown in FIG.
• the solid saddle mold 120 has a cavity 112 inside a saddle mold main body 121 composed of a main body portion 124 and a layer portion 125.
• a titanium aluminum alloy or a molten titanium alloy 50 is poured into the cavity 112 of the solid saddle mold 120 to be poured.
• the solid mold 120 is cooled, so that the molten metal 50 is solidified and the fabrication is completed. As a result, a forged body is formed in the solid mold 120.
• the forged product 140 is made from the titanium alloy or titanium alloy by taking out the forged product from the solid mold 120.
• the block body 103 of the rear layer slurry 93 is formed around the slurry films 24a and 24b having the two-layer structure.
• the invention is not particularly limited to this.
• the block body may be formed directly around the wax mold 70 in one manufacturing process. That is, after the wax mold 70 is placed in the space 92 of the mold 91, the rear layer slurry 93 is injected into the space 92, and the block composed of the single rear layer slurry directly around the wax mold 70 You may form a body.
• This rear layer slurry 93 is equivalent to the first layer slurry.
• a hardened layer ( ⁇ -case) containing a large amount of oxygen in the surface layer portion thereof is as thin as less than 300 m.
• the titanium alloy forged product 240 formed by forging the solid mold 120 according to the present embodiment has an ⁇ case layer thickness of about 280 m formed on the surface layer. Met.
• FIG. 24 shows that the titanium alloy forged product 240 formed by forging the solid mold 120 according to the present embodiment has an ⁇ case layer thickness of about 280 m formed on the surface layer. Met.
• the titanium alloy forged product 250 formed by forging using zirconia as the main component of the saddle-shaped aggregate and silica sol as the main component of the binder is formed in the ⁇
• the case layer thickness was about 500 m.
• the titanium alloy forged product 240 is about half as thick as the case a in comparison with the titanium alloy forged product 250.
• the saddle mold 120 is more suitable as a saddle mold for a super-sized forged product, a decorative product, an artificial tooth, an artificial bone, or the like, rather than a cage for a precision forged product.
• This saddle type 120 is durable and has a low cost of laminating, which simplifies the manufacturing process and therefore has excellent cost performance. As described above, it is needless to say that the present invention is not limited to the above-described embodiment, and various other things are assumed.

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• 2006
  • 2006-09-07 EP EP06797631.6A patent/EP1938918B1/en active Active
  • 2006-09-07 WO PCT/JP2006/317771 patent/WO2007029785A1/ja active Application Filing
  • 2006-09-07 US US12/065,692 patent/US20090169415A1/en not_active Abandoned
  • 2006-09-07 KR KR1020087004616A patent/KR101364563B1/ko active IP Right Grant
  • 2006-09-07 JP JP2007534474A patent/JP4451907B2/ja active Active
• 2010
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