JP2005205666A - Laminated cylindrical body with excellent heat insulation and heat distortion resistance and plunger sleeve for die casting machine - Google Patents

Abstract

The present invention provides a laminated cylindrical body excellent in heat insulation and heat distortion resistance suitable as a plunger sleeve for a die casting machine.
A first laminated cylinder 10 ₁ Not across the sintered ceramics layer superposed a metal cylinder concentrically, at least the innermost layer of the metal cylinder (first metal cylinder) 11 and its outer metal cylinder (Layer 2 metal cylinder) Laminated assembly in which interlaminar interconnect metal 3 such as fine metal wires is dispersedly disposed in a ceramic layer sandwiched between 12 is subjected to hot plastic working and compressed in the thickness direction and interlaminar connection It is a laminated molded body in which contact portions between the metal material 3 and the first metal cylinder 11 and the second metal cylinder 12 are diffusion bonded. The second laminated cylindrical body is a laminated molded body formed by hot plastic processing the laminated assembly and compressing it in the thickness direction, and through the small holes dispersedly formed in the laminated molded body, One metal cylinder 11 and the outer metal cylinder are joined by welding. The thickness of the first metal cylinder is preferably about 3-15 mm, and the thickness of the ceramic layer is preferably 1 mm or less.
[Selection] Figure 1

Description

  The present invention has an excellent heat insulation and heat retaining property due to a laminated structure sandwiching a ceramic layer, and has a heat resistant deformability for suppressing and preventing thermal deformation that tends to occur in the laminated structure, as a plunger sleeve of a die casting machine, etc. The present invention relates to a suitably used laminated cylindrical body.

  The casting operation of a die casting machine for injection casting non-ferrous metals (aluminum alloy, magnesium alloy, etc.) is performed via a plunger sleeve. The die casting machine is roughly classified into a horizontal apparatus shown in FIG. 22 and a saddle type apparatus shown in FIG. 23 according to the arrangement of the mold and the sleeve. The plunger sleeve (70) is fixed to the die plate (91) and connected to the mold (92). The sleeve (70) of the horizontal device (FIG. 13) has a hot water supply port (71) on the rear side, and the molten metal (M) is supplied into the sleeve from the opening (71), and the sleeve of the vertical device (FIG. 14). Hot water is supplied to the sleeve (70) (cylindrical body having no hot water outlet) from the opening at the upper end of the sleeve (70) tilted like a chain line. The molten metal (M) supplied to the sleeve (70) is injected (press-fitted) into the cavity (93) of the mold (92) by the plunger tip (80). Since the sleeve (70) requires corrosion resistance against non-ferrous metal melt, thermal shock resistance, and slidability and sliding wear resistance against the plunger tip (80) driven forward and backward in the sleeve, the SKD61. A cylindrical body made of alloy tool steel represented by (JIS-G4404) is used.

  In the above casting operation, it is a conventional problem that the temperature drop of the molten metal supplied to the plunger sleeve (70) is large. This is because the plunger sleeve has a high thermal conductivity (α) (SKD61: α of about 34 W / m / K) and a large heat loss due to contact with the sleeve. When the temperature of the molten metal in the sleeve is large, proper control of the casting temperature and stable maintenance of the casting quality are hindered, and when the molten metal adheres to the inner surface of the sleeve due to the temperature drop, the plunger tip (80 ) Is adversely affected by the service life of molten metal, and solidified pieces of molten metal may be mixed into the cast product and impair product quality. Setting the temperature of the hot water supply to the sleeve to be high in anticipation of the temperature drop of the molten metal is not preferable because it not only increases the heat energy cost but also promotes thermal damage to the components.

The following proposals have been made as a device for the plunger sleeve that suppresses and prevents the molten metal from falling.
(a) A fluid flow path is formed inside the thickness of the sleeve, and heated oil (about 200 ° C.) is circulated and circulated.
(b) A cylindrical body made of ceramic with low thermal conductivity is fitted and fixed inside the sleeve (SKD61 etc.) (Patent Document 1).
(c) A cylinder made of stainless steel or the like having low thermal conductivity is polymerized on the outside of the sleeve (SKD61, etc.), and the polymerization interface is joined by brazing, diffusion bonding, or hot isostatic pressure treatment (Patent Document 2) .
Japanese Patent Laid-Open No. 02-179346 Japanese Patent Laid-Open No. 11-300461

However, the internal heating structure (above (a)) in which a fluid flow path is formed in the wall thickness of the sleeve to circulate the heating fluid has a complicated apparatus configuration, a large maintenance burden, and poor practicality.
In the structure (b), in which a ceramic cylinder is fitted inside the sleeve, the ceramic (brittle material) is in direct contact with the high-temperature molten metal, so that damage due to thermal shock is likely to occur and the stability is poor. In addition, when the innermost surface of the sleeve is poorly slidable with the plunger tip, the sliding contact surface between the sleeve and the tip is easily damaged, so that the molten metal can easily be inserted into the sliding contact interface, increasing the sliding resistance, The smoothness of the casting operation is impaired due to a decrease in the injection speed or the like. For this reason, the ceramic cylinder requires good slidability with respect to the plunger tip, but it is not easy to select an applicable ceramic material type.
The heat insulation and heat retention performance by the structure (c) described above, in which a cylinder of stainless steel or the like is joined to the outside of the sleeve, is not so large and cannot be said to be satisfactory.

  The present invention is excellent in heat insulation and heat retention, stability as a structural member, maintainability, and the like, and when applied to a plunger sleeve of a die casting machine, effectively suppresses and prevents a temperature drop of the supplied molten metal. Thus, it is an object of the present invention to provide a laminated cylindrical body that facilitates temperature control of die casting and can improve and stabilize casting operation and casting quality.

  In the first laminated cylindrical body according to the present invention, a metal cylinder (1) is concentrically overlapped with a fibrous or powdery unsintered ceramic layer (2) interposed therebetween, and at least the innermost metal cylinder (first 1 metal cylinder) (11) and the outer metal cylinder (second metal cylinder) (12) sandwiched between the ceramic layer and the outer peripheral surface of the first metal cylinder and the second metal cylinder The capsule-like laminated assembly in which the interlayer connection metal material (3) in contact with the inner peripheral surface is dispersedly arranged is subjected to hot plastic working and compressed in the thickness direction and the interlayer connection metal material (3 ) And the first metal cylinder (11) and the second metal cylinder (12) are joined to each other through an interlayer coupling metal material. The first metal cylinder and the second metal cylinder are formed by diffusion bonding. It is characterized in that it is a laminated molded body (claim 1).

  The second laminated cylindrical body of the present invention heats a capsule-like laminated assembly formed by concentrating metal cylinders (1) concentrically via a fibrous or powdered unsintered ceramic layer (2). It consists of a laminated molded body formed by compressing in the thickness direction by interplastic processing, and the innermost metal cylinder and the outer metal cylinder are welded via small holes dispersedly formed in the laminated molded body ( 5). (Claim 2)

The third laminated cylindrical body of the present invention comprises a metal outer cylindrical body (30) and an inner cylindrical body (20 ₁ ) fixed to the inner side by shrink fitting, and the inner cylindrical body is the first laminated cylindrical body. It is characterized by comprising a cylindrical body (claim 2).

The fourth laminated cylindrical body of the present invention comprises a metal outer cylindrical body (30) and an inner cylindrical body (20 ₂ ) fixed to the inside by shrink fitting, and the inner cylindrical body is the second laminated cylindrical body. It is characterized by comprising a body (claim 4).

  A plunger sleeve for a die casting machine according to the present invention comprises a laminated cylindrical body configured by applying a required steel material type to a metal cylinder, an outer cylindrical body or the like forming the first to fourth laminated cylindrical bodies (claims). Item 9).

  There is no sintering reaction of ceramics or interaction between ceramics and metals in the hot plastic working temperature range of metal, and the ceramic layer in the laminated cylinder of the present invention is a substantially unsintered fiber or powder layer. It is interposed between the overlapping surfaces of the metal cylinders. The conventional “metal-ceramics” laminated structure using a sintered ceramic product as a heat insulating material requires a relatively thick ceramic layer, whereas the ceramic layer in the laminated cylindrical body of the present invention has a layer thickness. The thermal insulation performance far exceeds the thermal insulation effect predicted from In the use of a plunger sleeve for a die casting machine, a clear molten metal temperature-inhibiting effect for maintaining a stable casting temperature can be obtained as a heat shielding effect of a thin ceramic layer of about 1 mm or less (for example, 0.1 to 0.5 mm).

  This outstanding heat insulation heat retention effect is considered to be due to the fact that the ceramic layer is an unsintered layer and that the interface between the unsintered ceramic layer and the metal cylinder has a particularly high interfacial thermal resistance. Further, the fact that the ceramic layer is a layer made of substantially unsintered fibers or powder is different from the sintered ceramic layer (substantially rigid body) in that the manufacturing process of the laminated cylindrical body (hot plasticity) It can be deformed following the thermal expansion / contraction change of the laminated structure during processing and actual use, functions as a thermal stress absorption relaxation layer, and is effective in avoiding problems caused by thermal stress.

  When the laminated cylindrical body of the present invention is used for an application in which a heating fluid is supplied to the inside thereof (such as a sleeve for a die-casting machine), in order to further enhance the heat insulation heat retaining effect by the ceramic layer, It is advantageous to make the thickness of the metal cylinder (the first metal cylinder) as thin as possible (= close the ceramic layer as close to the inner peripheral surface as possible). In this case, the thinner the first metal cylinder is, the more likely it is that the diameter of the hollow hole of the sleeve is deformed (decrease in roundness due to the bulging deformation of the first metal cylinder). This will promote fretting damage of the sleeve and the chip itself. In this regard, according to the present invention, in the first laminated cylinder (Claim 1) and the third laminated cylinder (Claim 3), the first metal cylinder is formed into an inner metal cylinder through an interlayer connecting metal material. On the other hand, in the second laminated cylinder (Claim 2) and the fourth laminated cylinder (Claim 4), the first metal cylinder is connected to the inside by welding formed in the layer thickness direction through a small hole. As a reinforcing effect by the connection structure, the heat resistance deformation property of the laminated cylindrical body is enhanced, and the diameter deformation of the innermost layer metal cylinder is reduced and mitigated.

The first laminated cylindrical body and the second laminated cylindrical body according to the present invention are laminated molded bodies obtained as an integrally molded product by hot plastic working. In the following explanation, the former (first laminated cylindrical body) Is referred to as “laminate cylinder (10 ₁ )”, and the latter (second laminate cylinder) is referred to as “laminate cylinder (10 ₂ )”.
Further, the third laminated cylindrical body is obtained by fitting and integrating the first laminated cylindrical body into the hollow hole of the separately prepared outer cylindrical body by shrink fitting. Cylindrical body (10 ₃ ) ". In the fourth laminated cylinder, the second laminated cylinder is used as an inner cylinder, which is fitted and integrated into the hollow hole of the separately prepared outer cylinder by shrink fitting. Cylindrical body (10 ₄ ) ”.

First, the first laminated cylinder (10 ₁ ) and the second laminated cylinder (10 ₂ ) will be described in detail with specific examples.
[First laminated cylindrical body (10 ₁ )]
The first laminated cylindrical body (10 ₁ ) includes at least two metal cylinders and a ceramic layer that blocks a polymerization surface between the metal cylinders. FIG. 1 illustrates the layer structure of a laminated cylindrical body (10 ₁ ). This laminated cylindrical body (10 ₁ ) is composed of three metal cylinders (1) (11, 12, 13) and two ceramic layers (2) (2) that block the contact of the overlapping surfaces of these metal cylinders (1). 21, 22). 2 is an enlarged view of the portion A in FIG. 1, and FIG. 3 is a cross-sectional view taken along arrow II in FIG. Ceramics sandwiched between the innermost metal cylinder (11) (hereinafter referred to as “first metal cylinder”) and the metal cylinder (12) adjacent thereto (hereinafter referred to as “second metal cylinder”) of the laminated cylindrical body (10 ₁ ). In the layer (21), the inter-layer bonding metal material (3) is dispersedly arranged. The interlayer bonding metal material (3) penetrates the ceramic layer (21) and is in contact with the outer peripheral surface of the first metal cylinder (11) and the inner peripheral surface of the second metal cylinder (12). The first metal cylinder (11) and the second metal cylinder (12) are coupled to each other by diffusion bonding at the contact portion of the interlayer coupling metal material (3).

FIG. 4 shows an example of a capsule-like laminated assembly (A1) for forming the laminated cylindrical body (10 ₁ ) of FIG. 1 as a hot-plastic processed product. The capsule-shaped laminated assembly (A1) is formed by concentrically polymerizing the metal cylinders (11), (12), and (13) through the ceramic layers (21) and (22), and has a donut disk-like shape at the openings at both ends. It is configured by attaching and sealing the end plate (15) by welding (w). The ceramic layers (21) and (22) are unsintered ceramic layers made of fibrous or powdered ceramics, and the first ceramics sandwiched between the first metal cylinder (11) and the second metal cylinder (12). In the layer (21), the interlayer bonding metal material (3) is dispersedly arranged. One end of the interlayer-bonded metal material (3) is in contact with the outer peripheral surface of the first metal cylinder (11), and the other end is in contact with the inner peripheral surface of the second metal cylinder (12).

  The ceramic layer (2) of the capsule-like laminated assembly (A1) is formed using powder or fibrous ceramics. FIG. 5 shows an example of the ceramic fiber sheet (2S) used for forming the capsule-shaped laminated assembly (A1). The ceramic fiber sheet (2S) has a metal wire (3) as an interlayer bonding metal material (3), for example, a thin wire of stainless steel (stainless steel has a lower thermal conductivity than alloy tool steel, etc.). Distributed. The II-II cross section is shown in Fig. 6 [1] [2] [3]. Figure [1] shows an example in which a metal wire (3a) is pierced into a ceramic fiber sheet (2S) and exposed alternately on the front and back surfaces. [2] is a metal wire (3b) cut short. Is inserted into the ceramic fiber sheet (2S) and bent into a U shape, and [3] in FIG. 3 is a flat cut by piercing the ceramic fiber sheet (2S) with the metal wire (3c) cut into short pieces. This is an example in which the sheet is bent and adhered to the sheet surface. For the metal wires (3a) to (3c), for example, a wire having a wire diameter of about 0.05 to 1 mm is preferably used from the viewpoint of handling (attachment) to the ceramic fiber sheet (2S).

FIG. 7 shows a state in which the ceramic fiber sheet (2S) of FIG. 5 is wound around the metal cylinder (1) (11, 12). When using ceramic fiber sheets, the layer thickness can be easily adjusted by increasing or decreasing the number of stacked sheets, and the handling operation to disperse and arrange the inter-layer joining metal material (3) is also extremely difficult compared to powder ceramics. Easy. In addition, the fall of the heat insulation performance accompanying the dispersion | distribution arrangement | positioning of the interlayer joining metal material (3) in a ceramic layer (2) is very slight. For example, when a metal wire having a wire diameter of 1 mm is used as the interlayer bonding metal material (3), the conduction heat transfer area (diameter cross-sectional area of the wire) penetrating the ceramic layer (2) in the layer thickness direction is π × 1 mm. ^Since it is 2/4 (≒ 0.8mm ² ), even in the case of a high-density dispersed arrangement in which the number of penetrations of the metal wire per 1 cm ² of the ceramic layer is one, the area reduction of the ceramic layer due to the penetration of the wire the rate is only about ^{0.8% (= 0.8mm 2/100} mm 2 × 100%), thus functions as a heat blocking layer of the ceramic layer (2) is sufficiently maintained.

The hot plastic working of the capsule-like laminated assembly (A1) is performed by hot isostatic pressing (HIP) or hot extrusion. When the capsule-like laminated assembly (A1) is subjected to hot plastic working, for example, HIP treatment, the metal cylinders (11), (12), and (13) are deformed by plastic deformation under heat and pressure, and the ceramic layers (21) (22). ) Are pressed against each other, and bonding (diffusion bonding) of the contact surfaces between the interlayer bonded metal material (3) and the metal cylinders (11) and (12) occurs. In the temperature range where hot plastic working of metal is performed, there is no sintering reaction of the ceramic layers (21) and (22) and no interface reaction with the metal cylinder, and the state of substantially unsintered fiber or powder is maintained. It becomes a compression-densified layer between the overlapping surfaces of the metal cylinder. After the hot plastic working, the end plates (15) and (15) are removed by machining to obtain the laminated cylindrical body (10 ₁ ) shown in FIG.

  FIGS. 1 and 4 show examples in which the interlayer bonding metal material (3) is interposed only in the first ceramic layer (21). However, if desired, the interlayer bonding metal material (3) may also be bonded to the outer ceramic layer (22). The ceramic sheet (2S) (FIGS. 5 and 6) in which the metal material (3) is dispersedly arranged is used, thereby connecting the first metal cylinder (11) and the inner metal cylinders (12) and (13). The reinforcement effect by can be further enhanced.

[Second laminated cylindrical body (10 ₂ )]
The second laminated cylindrical body (10 ₂ ) includes at least two metal cylinders and a ceramic layer that blocks a polymerization surface between the metal cylinders. FIG. 8 shows an example of a cross-sectional structure of the _second laminated cylindrical body (10 ₂ ), and FIG. 9 shows a cross section taken along the line III-III. The laminated cylindrical body (10 ₂ ) is composed of three ceramic cylinders (2) (21, 22) interposed between the three metal cylinders (1) (11, 12, 13) and the polymerization interface between the metal cylinders (1). The innermost metal cylinder (first metal cylinder) (11) and the inner metal cylinders (12) (13) penetrate the ceramic layers (2) (21, 22). Connected by welding (5).

FIG. 11 shows a capsule-like laminated assembly (A2) for forming the laminated cylindrical body (10 ₂ ) of FIG. 8 as a hot plastic working compact. This capsule-like laminated assembly (A2) is interposed via ceramic layers (21) and (22) in the same manner as the capsule-like laminated assembly (A1) for producing the laminated cylindrical body (10 ₁ ). The metal cylinders (11), (12), and (13) are polymerized concentrically, and the doughnut-shaped end plates (15) are attached to the openings at both ends, and then joined and sealed by welding (w). . However, the ceramic layer (2) in this case is not required to interpose the interlayer bonding metal material (3) (FIG. 4). When the ceramic fiber sheet (2S) is used as the ceramic layer (21) (22), it can be wound around the metal cylinder (1) as shown in FIG. Easy.

When the hot plastic working (for example, HIP treatment) of the capsule-shaped laminated assembly (A ₂ ) is subjected to hot plastic working (for example, HIP treatment), the metal cylinders (11), (12) and (13) are plastically deformed under heating and pressure. As a result, the ceramic layers (21) and (22) are clamped to form a tight laminated molded body. There is no sintering reaction of the ceramic layers (21) and (22) and no interfacial reaction with the metal cylinder in the temperature range in which the metal is subjected to hot plastic working. A compression-densified layer is formed between the overlapping surfaces of the cylinder.

After the hot plastic working, the end plates (15) and (15) are removed by machining to take out the laminated cylindrical body. Then, as shown in FIG. 10, the diameter is measured from the outside of the laminated cylindrical body (10 ₂ ′). Small holes (4) for welding that are oriented in the direction are distributed and drilled. The hole diameter of the small hole (4) is, for example, about 5 to 10 mm, and is formed to a depth that reaches the innermost first metal cylinder (11). What is necessary is just to set suitably the dispersion density of a small hole (4) according to the magnitude | size of a hole diameter. The small hole (4) may be welded by using the same or similar material as the metal cylinder (1) as a welding material, and by overlay welding (eg, powder plasma welding, MIG welding, etc.). A weld (5) is formed on 4) to obtain the laminated cylindrical body (10 ₂ ) of FIG.

The formation of the small hole (4) and the construction of the overlay welding (5) do not necessarily have to be performed after the hot plastic working, and the capsule-like laminated assembly (A ₂ ) in FIG. Small holes (4) (not shown) may be dispersedly drilled from the outer peripheral surface side, weld (5) may be applied, and hot plastic working may be performed. In this case, the laminated cylindrical body (10 ₂ ) shown in FIG. 8 is obtained as the hot plastic working formed body, and therefore the formation of the small hole (4) and the welding (5) after the hot plastic working are unnecessary. It becomes.

Metal cylinders (1) (11, 12, 13), ceramic layers (2) (21, 22), etc. constituting the first laminated cylinder (10 ₁ ) and second laminated cylinder (10 ₂ ) The material type is appropriately selected according to the specific application, usage environment conditions, etc. of the laminated cylindrical body.
An example of a plunger sleeve for a die casting machine is as follows. The first metal cylinder (11) (which becomes the contact surface of the molten metal and the sliding surface of the plunger tip) has corrosion resistance to the molten metal, the sliding property of the plunger tip, the sliding wear resistance, etc. If so, the material type is not limited, but SKD61 (C: 0.32-0.42%, Si: 0.8-1.2%, Mn: 0.5% or less, Cr: 4.5-5.5%, Mo, which is conventionally used as a plunger sleeve material : Alloy tool steel (JIS-G4404) typified by 1.0-1.5%, V: 0.8-1.2%) is suitable. The metal cylinders (12, 13) outside the first metal cylinder (11) are only required to have the mechanical strength necessary for the plunger sleeve. In addition to alloy tool steel such as SKD61, S45C or the like Carbon steel for machine structure (JIS-G4051), general structural steel such as SS400 (JIS-G3101), etc. are applied.

The ceramic layer (2) interposed between the polymerized surfaces of the metal cylinders (1) is composed of oxide (Al ₂ O ₃ , SiO ₂ , Al ₂ O ₃ —SiO ₂ , ZrO ₂ etc.), nitride (Si ₃ N _4, etc.), carbide (SiC, etc.) or the like, its grade is not limited. When the ceramic layer (2) has a plurality of layers, the same kind or different kinds of materials are appropriately used for each layer. An example of a suitable sheet material when using a fiber sheet is an Al ₂ O ₃ —SiO ₂ ceramic fiber sheet.

The number of layers of the metal cylinder (1) and the ceramic layer (2) and the layer thickness of each layer are appropriately designed according to the size, application, specific use conditions, etc. of the stacked cylinder. As for the plunger sleeve for the die casting machine, the thickness of the first metal cylinder (11) in contact with the molten metal is preferably about 15 mm or less from the viewpoint of further enhancing the heat insulating effect by the ceramic layer (21). More preferably, it is 10 mm or less. However, if the thickness is excessively thin, there is a risk that the strength required for the innermost layer may be insufficient. Therefore, it is preferable to have a thickness of at least about 3 mm.
It is preferable that each layer thickness of ceramic layer (2) (21,22 ...) is about 1 mm or less so that the robustness of the laminated structure of an inner cylinder may not be impaired, More preferably, 0.2- 0.5 mm. Even with such an extremely thin layer, an excellent heat insulation and heat insulation effect can be obtained. About 1 to 4 layers are sufficient for the ceramic layer (2).

The hot plastic working conditions for forming the laminated cylindrical body (10 ₁ ) (10 ₂ ) vary depending on the material type of the metal cylinder, but when the laminated cylindrical body as the plunger sleeve is molded by HIP, the temperature: about 300 It can be efficiently achieved under the conditions of ˜1000 ° C. and applied pressure: about 50 to 200 MPa. The resulting laminated cylindrical body (10 ₁ ) (10 ₂ ) is subjected to formation of a hot water inlet (71) and other necessary machining, and parts such as a base member (72) are further attached to the product plunger sleeve. Finished.

Next, the third laminated cylinder (10 ₃ ) and the fourth laminated cylinder (10 ₄ ) will be described.
[Third laminated cylinder (10 ₃ )]
The third laminated cylindrical body (10 ₃ ) includes a metal outer cylindrical body (30) and a multilayered inner cylindrical body (20 ₁ ) that is shrink-fitted thereto. FIG. 12 shows an example of the third laminated cylindrical body (10 ₃ ). FIG. 13 shows an enlarged view of the portion B, and FIG. 14 shows a section taken along the arrow IV-IV.
The inner cylindrical body (20 ₁ ) is a hot plastic working formed body having the same laminated structure as the first laminated cylindrical body (10 ₁ ). The illustrated inner cylinder (20 ₁ ) includes three metal cylinders (1) (11, 12, 13) and two ceramic layers (2) (2) that block contact between the metal cylinders (1). 21 and 22) have a layer structure in which concentric layers are laminated. The ceramic layer (21) between the innermost first metal cylinder (11) and the second metal cylinder (12) adjacent to the first metal cylinder (11) is the same as the _first laminated cylinder (10 ₁ ). The inter-layer bonding metal material (3) is dispersedly arranged, penetrates the ceramic layer (21) in the layer thickness direction, and comes into contact with the outer peripheral surface of the first metal cylinder (11) and the second metal cylinder (12). The first metal cylinder (11) and the second metal cylinder (12) are bonded to each other (diffusion bonding) via the bonding metal material (3).

FIG. 16 shows an example of a capsule-like laminated assembly (A3) for forming the inner cylindrical body (20 ₁ ) of the third laminated cylindrical body (10 ₃ ) as a hot plastic working molded body. . The procedure for assembling the capsule laminated assembly (A3) is the same as that of the capsule laminated assembly (A1) [FIG. 4] forming the _first laminated cylindrical body (10 ₁ ). 21) Metal cylinders (11), (12) and (13) are polymerized concentrically through 22 and (22), and a doughnut-shaped end plate (15) is applied to the openings at both ends and joined by welding (w). It is assembled by sealing. The ceramic layer (21) sandwiched between the first metal cylinder (11) and the second metal cylinder (12) of the laminated assembly (A3) has an interlaminar bonded metal material (3) dispersed therein, and the ceramics If the ceramic fiber sheet (2S) shown in FIGS. 5 and 6 is applied as the layer (21), the laminated assembly (FIG. 7) is wound around the body peripheral surface of the metal cylinder (1) as shown in FIG. The efficiency of the assembly of A3) is also the same as that of the capsule-like laminated assembly (A1) [FIG. 4] of the first laminated cylindrical body (101).

If the capsule-like laminated assembly (A3) is subjected to hot plastic working such as hot isostatic pressing (HIP), the metal cylinders (11), (12) and (13) are heated and pressurized. By the plastic deformation, the ceramic layers (21) and (22) are pressed against each other while being sandwiched, and the contact surfaces between the interlayer bonded metal material (31) and the metal cylinders (11) and (12) are bonded (diffusion bonding). Occurs. In the temperature range where hot plastic working of metal is performed, there is no sintering reaction of the ceramic layers (21) and (22) and no interface reaction with the metal cylinder, and the state of substantially unsintered fiber or powder is maintained. It becomes a compression-densified layer between the overlapping surfaces of the metal cylinder. After the hot plastic working, the end plates (15) and (15) are removed by machining to obtain the inner cylinder (20 ₁ ). Next, as shown in FIG. 15, the inner cylindrical body (20 ₁ ) is fitted and fixed in a hollow hole of a separately prepared metal outer cylindrical body (30) by shrink fitting, so that a third laminated cylindrical body (40 ₁ ) Finished in [Fig. 12].

  In FIGS. 12 to 16, the interlayer bonding metal material (3) is interposed only in the first ceramic layer (21), but if desired, the interlayer bonding metal material (3) may also be disposed on the outer ceramic layer (22). If the ceramic sheet (2S) (FIGS. 5 and 6) in which particles are dispersed is used, the reinforcing effect by the coupling structure of the first metal cylinder (11) and the inner metal cylinders (12) and (13) is further enhanced. be able to.

Next, the fourth laminated cylindrical body (10 ₄ ) will be described.
[Fourth laminated cylinder (10 ₄ )]
The fourth laminated cylindrical body (10 ₄ ) includes a metal outer cylindrical body (30) and a multilayered inner cylindrical body (20 ₂ ) shrink-fitted thereto. FIG. 17 is an example of the third laminated cylindrical body (40 ₂ ), and a cross section taken along the arrow VV is shown in FIG.
The inner cylindrical body (20 ₂ ) is a hot plastic working molded body having the same laminated structure as the second laminated cylindrical body (10 ₂ ). The illustrated inner cylinder (20 ₂ ) is composed of three ceramic cylinders (1) (11, 12, 13) and two ceramic layers that block contact between the polymer cylinders (11, 12, 13). 2) (21, 22) has a layer structure in which concentric layers are laminated, and an innermost metal cylinder (first metal cylinder) (11) and inner metal cylinders (12), (13), Bonded by welding (5) penetrating the ceramic layers (21, 22).

FIG. 21 shows a capsule-like laminated assembly (A4) for forming the inner cylindrical body (20 ₂ ) of the fourth laminated cylindrical body (10 ₄ ) as a hot plastic working formed body. This capsule-like laminated assembly (A4) is the same as that of the capsule-like laminated assembly (A2) [FIG. 11] for manufacturing the _second laminated cylindrical body (10 ₂ ). 21) Metal cylinders (11), (12), and (13) are polymerized concentrically via 22 and (22), and a donut disk-like end plate (15) is attached to both openings by welding and sealing (w) It is formed by doing. When the ceramic fiber sheet (2S) is used as the ceramic layers (21) and (22), it can be wound and mounted on the metal cylinder (1) as shown in FIG. It is. In this case, the ceramic layer (2) does not require the interlayer bonding metal material (3) (FIG. 4).

  When the capsule-like laminated assembly (A4) is subjected to hot plastic processing such as HIP, the metal cylinders (11), (12), and (13) are deformed by plastic deformation under heating and pressure, and the ceramic layer (21) ( While sandwiching 22), they are pressure-bonded to each other to form a close laminated molded body. There is no sintering reaction of the ceramic layers (21) and (22) and no interfacial reaction with the metal cylinder in the temperature range in which the metal is subjected to hot plastic working, and the metal is kept in a substantially unsintered fiber or powder state. A compression-densified layer is formed between the overlapping surfaces of the cylinder.

After hot plastic working, the end plates (15) and (15) are removed by machining to take out the laminated cylindrical body, and then the second laminated cylindrical body (10 ₂ ) [FIG. 8] is formed. Similarly, small holes (4) for welding are distributed and drilled to obtain a laminated cylindrical body (20 ₂ ′) shown in FIG. The small hole (4) is formed to a depth reaching the innermost first metal cylinder (11). In each small hole (4), overlay welding is performed according to a conventional method to obtain an inner cylinder (20 ₂ ). The obtained inner cylinder (20 ₂ ) is shrink-fitted and fixed in a hollow hole of a separately prepared metal outer cylinder (30) as shown in FIG. 19, so that the fourth laminated cylinder (10 ₂ ) [ FIG. 17] is obtained.

The formation of the small hole (4) of the inner cylinder (20 ₂ ) and the build-up welding (5) do not necessarily have to be performed after the hot plastic working, and the capsule-like laminated assembly shown in FIG. Small holes (4) (not shown) may be formed in the body (A4) from the outer peripheral surface side, and welding (5) (not shown) may be applied, followed by hot plastic working. . In this case, an inner cylindrical body (20 ₂ ) shown in FIG. 19 is obtained as a hot plastic working formed body.

Respective inner cylinders (20 ₁ ) (20 ₂ ) of the third and fourth laminated cylindrical bodies (10 ₃ ) (10 ₄ ) are replaced with the first laminated cylindrical bodies (10 ₁ ) [FIG. 1] and second In contrast to the laminated cylindrical body (10 ₂ ) [FIG. 8], the first and second laminated cylindrical bodies (10 ₁ ) (10 ₂ ) While the second metal cylinder (12) (13) surrounding the one metal cylinder (11) needs to be designed to be relatively thick, the third and fourth laminated cylinders (40 ₁ ) and the laminated cylinder The inner cylinder (20 ₁ ) (20 ₂ ) in the body (40 ₂ ) is reinforced by the metal outer cylinder (30) surrounding the inner cylinder (20 ₁ ) (20 ₂ ). For this reason, the outer metal cylinders (12, 13) surrounding the first metal cylinder (11) in the inner cylinders (20 ₁ ) (20 ₂ ) are the first and second stacked cylinders (10 ₁ ) (10 Compared with the metal cylinder (12, 13) of ₂ ), it can be designed to be relatively thin. Accordingly, the size of the capsule-like laminated assembly (A3) (A4) [FIGS. 16 and 21] can be reduced accordingly. This is because of restrictions in hot plastic working (for example, the scale of the HIP device) This is effective to alleviate or avoid capacity constraints.

The number of layers of the metal cylinder (1) and the ceramic layer (2) constituting the inner cylinders (20 ₁ ) (20 ₂ ) of the third and fourth stacked cylinders (10 ₃ ) (10 ₄ ) The layer thickness of each layer is appropriately designed according to the size and application / specific use conditions of the laminated cylindrical body. The plunger sleeve for the die casting machine will be described. The inner cylindrical body (20 ₁ ) (20 ₂ ) is the same as the first and second laminated cylindrical bodies (10 ₁ ) (10 ₂ ) as the first metal cylinder. (11) is preferably an alloy tool steel represented by SKD61 (JIS-G4404) from the viewpoints of corrosion resistance against molten metal, plunger tip slidability and sliding wear resistance. The metal cylinders (12, 13) are not only alloy tool steels such as SKD61, but also carbon steels for mechanical structures such as S45C (JIS-G4051), general structural steels such as SS400 (JIS-G3101), etc. Good. The thickness of the first metal cylinder (11) that is in contact with the molten metal is preferably about 15 mm or less, more preferably 10 mm or less, in order to further enhance the heat insulation and thermal insulation effect by the ceramic layer (21). In order to avoid a lack of necessary strength, it is preferable that the thickness is at least about 3 mm. The ceramic layers (21, 22...) Are the same as those of the first and second laminated cylindrical bodies (10 ₁ ) (10 ₂ ), and the robustness of the laminated structure of the inner cylinder is not impaired. The thickness is preferably about 1 mm or less, more preferably 0.2 to 0.5 mm, and the number of layers may be about 1 to 4 layers.

Further, the metal outer cylinder (30) for shrink-fitting and fixing the inner cylinders (20 ₁ ) (20 ₂ ) is used for machine tool structures such as S45C as well as alloy tool steel such as SKD61 which is a conventional sleeve material. Carbon steel (JIS-G4051), general structural steel (JIS-G3101) such as SS400 may be used. The shrink-fitting and fixing between the metal outer cylinder (30) and the inner cylinder (20 ₁ ) or (20 ₂ ) is performed in a temperature range of 300 to 500 ° C., for example.
A third laminated cylindrical body (10 ₃ ), a fourth laminated cylindrical body (10 ₄ ) formed by integrating the inner cylindrical body (20 ₁ ) or (20 ₂ ) by shrink fitting to the metal outer cylindrical body (30). ) Is formed into a required shape by machining, and a product plunger sleeve is finished by attaching necessary members such as a die (72).

Industrial application fields

  The laminated cylindrical body of the present invention has an excellent thermal barrier property due to the ceramic layer, and also has a good heat distortion resistance as a reinforcing effect due to the split structure of the inner cylindrical body while having a multilayer structure including the ceramic layer. Therefore, when it is applied as a plunger sleeve of a die casting machine, for example, where these characteristics are required, the temperature drop of the molten metal and the resulting casting quality and casting operation problems are avoided, and the temperature Efficient casting operations such as high-temperature hot water supply that is expected to decline and the waste of heat energy costs associated with it are eliminated, temperature management of the molten metal is facilitated, and the service life is improved by mitigating and reducing sleeve damage. It is effective.

It is an axial direction sectional view showing typically the lamination structure of the 1st lamination cylinder of the present invention. It is an enlarged view of the A section of FIG. It is the II sectional view taken on the line of FIG. FIG. 2 is an axial cross-sectional view showing an example of a capsule-like laminated assembly for producing the laminated cylindrical body of FIG. 1 as a hot plastic working formed body. It is a top view which shows the example of the ceramic sheet | seat used for the assembly of the capsule-shaped laminated assembly of FIG. It is II-II arrow sectional drawing of FIG. FIG. 5 is a perspective explanatory view showing a state in which a ceramic sheet for assembling the capsule-shaped laminated assembly of FIG. 4 is wound around a metal cylinder.

It is an axial direction sectional view showing typically the lamination structure of the 2nd lamination cylinder of the present invention. It is the III-III arrow sectional drawing of FIG. It is an axial sectional view showing a state before welding construction of the laminated cylindrical body of FIG. It is an axial direction sectional view which shows the example of the capsule-shaped laminated assembly for manufacturing the laminated cylindrical body of FIG. 8 as a hot plastic-working molded object.

It is an axial direction sectional view showing typically the lamination structure of the 3rd lamination cylinder of the present invention. It is an enlarged view of the B section of FIG. It is IV-IV arrow sectional drawing of FIG. It is an axial direction cross-sectional explanatory drawing which shows the fitting state of the metal outer cylinder and inner cylinder which form the lamination | stacking cylindrical body of FIG. FIG. 13 is an axial cross-sectional view showing an example of a capsule-shaped laminated assembly for producing the inner cylindrical body of the laminated cylindrical body of FIG.

It is an axial direction sectional view showing typically the lamination structure of the 4th lamination cylinder of the present invention. It is the VV arrow directional cross-sectional view of FIG. It is an axial direction cross-sectional explanatory drawing which shows the fitting state of the metal outer cylinder and inner cylinder which form the lamination | stacking cylindrical body of FIG. FIG. 18 is an axial cross-sectional view showing a state before welding construction of an inner cylindrical body used for configuring the laminated cylindrical body of FIG. 17. FIG. 18 is an axial cross-sectional view showing an example of a capsule-like laminated assembly for producing the inner cylindrical body of the laminated cylindrical body of FIG.

It is a section explanatory view showing the arrangement arrangement of the plunger sleeve of the horizontal die casting machine. It is a section explanatory view showing the arrangement arrangement of the plunger sleeve of the rigid die casting machine.

Explanation of symbols

1 (11,12,13): Metal cylinder 2 (21,22): Ceramic layer 2S: Ceramic fiber sheet 3 (3a, 3b, 3c): Interlayer bonded metal material
4: Small hole for welding 5: Welding 10 (10 ₁ , 10 ₂ , 10 ₃ , 10 ₄ ): Laminated cylindrical body
20 ₁ , 20 ₂ : Inner cylinder 30: Metal outer cylinder

15: End plate 70: Plunger sleeve 71: Hot water inlet 72: Base 80: Plunger chip 91: Die plate 92: Mold 93: Cavity A1, A2, A3, A4: Capsule laminated assembly M: Molten metal w: Welding

Claims (9)

  The metal cylinder (1) is concentrically overlapped with the unsintered ceramic layer (2) in the form of fiber or powder, and at least the innermost metal cylinder (first metal cylinder) (11) and the outer metal An interlayer connection metal material that penetrates the ceramic layer and contacts the outer peripheral surface of the first metal cylinder and the inner peripheral surface of the second metal cylinder in the ceramic layer sandwiched between the cylinders (second metal cylinder) (12) The capsule-like laminated assembly in which (3) is dispersedly arranged is subjected to hot plastic working and compressed in the thickness direction, and the interlayer connecting metal material (3), the first metal cylinder (11), and the second A heat insulation characterized in that the first metal cylinder and the second metal cylinder are laminated and bonded to each other via an interlayer connecting metal material, which is formed by diffusion bonding a contact portion with the metal cylinder (12). Laminated cylinder with excellent heat resistance and heat distortion resistance.   A capsule-shaped laminated assembly formed by concentrating metal cylinders (1) concentrically with a fibrous or powdery unsintered ceramic layer (2) in between is compressed in the thickness direction by hot plastic working. It is composed of a formed layered product, and the innermost metal cylinder and the outer metal cylinder are joined by welding (5) through small holes dispersedly formed in the layered product. Laminated cylindrical body with excellent heat insulation and heat distortion resistance. A heat insulation characterized by comprising a metal outer cylinder (30) and an inner cylinder (20 ₁ ) fixed to the inside thereof by shrink fitting, the inner cylinder comprising the laminated cylinder according to claim 1. Laminated cylinder with excellent heat resistance and heat distortion resistance. A heat insulation characterized by comprising a metal outer cylinder (30) and an inner cylinder (20 ₂ ) fixed to the inside thereof by shrink fitting, the inner cylinder comprising the laminated cylinder according to claim 2. Laminated cylinder with excellent heat resistance and heat distortion resistance.   The heat insulating property according to claim 1 or 2, wherein the innermost metal cylinder (first metal cylinder) is made of an alloy tool steel, and the other metal cylinder excluding the first metal layer is made of an alloy tool steel or carbon steel. -A laminated cylindrical body with excellent heat distortion resistance.   The innermost metal cylinder (first metal cylinder) of the inner cylinder is made of alloy tool steel, and the other metal cylinders excluding the first metal layer and the outer cylinder are made of alloy tool steel or carbon steel. A laminated cylindrical body excellent in heat insulation and heat distortion resistance according to claim 4.   The laminated cylindrical body excellent in heat insulation and heat distortion resistance according to any one of claims 1 to 6, wherein the ceramic layer (2) is made of a ceramic fiber sheet.   The laminated cylindrical body excellent in heat insulation and heat distortion resistance according to any one of claims 1 to 7, wherein the hot plastic working of the capsule-like laminated assembly is hot isostatic pressing. .   A plunger sleeve for a die casting machine comprising the laminated cylindrical body according to claim 7 or 8.

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