WO2019123938A1 - Procédé de fabrication d'un produit fritté à base de tungstène ou similaire et produit fritté à base de tungstène ou similaire - Google Patents

Procédé de fabrication d'un produit fritté à base de tungstène ou similaire et produit fritté à base de tungstène ou similaire Download PDF

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Publication number
WO2019123938A1
WO2019123938A1 PCT/JP2018/042771 JP2018042771W WO2019123938A1 WO 2019123938 A1 WO2019123938 A1 WO 2019123938A1 JP 2018042771 W JP2018042771 W JP 2018042771W WO 2019123938 A1 WO2019123938 A1 WO 2019123938A1
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WIPO (PCT)
Prior art keywords
tungsten
green compact
refrigerant
sintered product
powder
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PCT/JP2018/042771
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English (en)
Japanese (ja)
Inventor
慎太郎 荒木
誠 澤井
石井　啓介
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本田金属技術株式会社
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Publication of WO2019123938A1 publication Critical patent/WO2019123938A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide

Definitions

  • the present invention relates to a tungsten-based or similar sintered product having a coolant passage inside.
  • a cylinder head which is one of the components of an internal combustion engine, is manufactured by a casting method.
  • a molten metal such as aluminum alloy is injected into a cavity of a mold, and when the molten metal hardens, it is taken out of the mold. What is taken out becomes a cylinder head.
  • the shape of the combustion chamber in an internal combustion engine greatly affects the output. Therefore, the accuracy of the combustion chamber is required. Because the cylinder head forms a part of the combustion chamber, the combustion chamber of the cylinder head is required to have the strength as well as the accuracy more than other parts of the cylinder head.
  • a lower mold for a conventional cylinder head mold will be described based on FIG.
  • a combustion chamber core 201 is attached to the lower die 200 of the cylinder head mold.
  • the combustion chamber core 201 is provided with a cooling passage 202. By flowing a refrigerant (water or air) into the cooling passage 202, the temperature rise of the combustion chamber core 201 is prevented.
  • the prior art shown in FIG. 12 has the following problems.
  • the shape of the cooling passage 202 has the following problems.
  • the material of the combustion chamber core 201 is presumed to be mold steel or equivalent steel.
  • the combustion chamber core 201 can be obtained by machining the steel block.
  • the cooling passage 202 is machined by a drill.
  • a drill is a cutting tool that processes straight holes.
  • the cooling passage 202 is linear and has a simple form.
  • the material of the combustion chamber core 201 is steel, it is melted away by molten aluminum. While the combustion chamber core 201 is required to have long life, it is desirable that the material be resistant to melting loss.
  • the combustion chamber core 201 is steel, the thermal conductivity of the steel is lower than that of aluminum. If the thermal conductivity is low, the heat tends to stagnate. As a countermeasure, it is necessary to increase the amount of refrigerant supplied to the cooling passage 202. The cross-sectional area of the cooling passage 202 also needs to be increased, which affects the mold design. Therefore, it is desirable that the combustion chamber core 201 be made of a material having a thermal conductivity higher than that of steel.
  • Patent No. 3636108 gazette
  • the present invention is a metal component that has a heat conductivity higher than that of steel, is resistant to erosion, has a complicated refrigerant passage inside, and can be used as a combustion chamber core (hereinafter referred to as a nested).
  • the challenge is to provide
  • the invention according to claim 1 is a preparing step of preparing a powder mainly composed of at least one of tungsten, molybdenum and tungsten carbide, a first forming die, a second forming die, and a sintering furnace.
  • the invention according to claim 2 is a preparing step of preparing a powder mainly composed of at least one of tungsten, molybdenum and tungsten carbide, a first forming die, a second forming die, and a sintering furnace.
  • the invention according to claim 3 is preferably a sintered product of tungsten or the like consisting mainly of at least one of tungsten, molybdenum and tungsten carbide or the like. There is a refrigerant passage inside and there is no boundary layer inside.
  • the invention according to claim 4 is preferably a tungsten-based or similar sintered product according to claim 3;
  • a part of the cooling passages has a straight bottom extending along an orthogonal line orthogonal to the central axis of the tungsten-based material or the like.
  • a first powder compact having as a main material a powder mainly comprising at least one of tungsten, molybdenum and tungsten carbide is prepared, and a first refrigerant is used as the first powder compact.
  • Set up a passage Forming a second green compact comprising at least one of tungsten, molybdenum and tungsten carbide as a main material, and providing a second refrigerant passage in the second green compact;
  • the first powder compact is combined with the second powder compact so that the first coolant channel is connected to the second coolant channel, and a liquid phase sintering process is performed to obtain a tungsten-based or similar sintered product. obtain.
  • Tungsten, molybdenum and tungsten carbide powders have higher thermal conductivity than steel and are resistant to erosion. If it is before combining the first green compact with the second green compact, the first green compact can be provided with a complicated first refrigerant passage. The same applies to the second green compact. According to the present invention, there is provided a tungsten-based or similar sintered product having a higher thermal conductivity than steel, resistance to erosion, and a complicated form of refrigerant passage inside.
  • the following effects are added to the effects of the invention according to claim 1. Since the first cooling passage is formed at the same time as obtaining the first green compact, the number of processes is smaller than in the first aspect. The first green compact can be manufactured more efficiently than in the first aspect.
  • the tungsten-based or similar sintered product has the refrigerant passage inside and does not have the boundary layer inside. Since the boundary layer does not exist, the tungsten-based or similar sintered product has high mechanical strength, and the occurrence of cracking due to thermal fatigue is suppressed in the casting cycle in which heating and cooling are repeated.
  • tungsten, molybdenum and tungsten carbide have higher thermal conductivity than steel and are resistant to erosion. If it is before combining the first green compact with the second green compact, the first green compact can be provided with a complicated first refrigerant passage. The same applies to the second green compact. According to the present invention, there is provided a tungsten-based or similar sintered product having a higher thermal conductivity than steel, resistance to erosion, and a complicated form of refrigerant passage inside.
  • a portion of the cooling passage has a straight bottom extending along an orthogonal line orthogonal to the central axis of a tungsten-based or similar sintered product. Even when foreign matter is mixed in the refrigerant, the foreign matter is less likely to stay if it is a straight bottom.
  • a groove is formed in one powder compact, and the opening of this groove is formed into the other powder compact.
  • the refrigerant passage can be formed by closing with a molded body. Since the grooves are open before overlapping, they can be easily formed in one of the green compacts.
  • 1 is a cross-sectional view of an essential part of an internal combustion engine. It is a sectional view of a cylinder head. It is sectional drawing of a metal mold
  • the internal combustion engine 10 has a cylinder block 11, a cylinder head 12 mounted on the cylinder block 11, and a head cover 13 covering an upper surface of the cylinder head 12.
  • the cylinder head 12 has an intake passage 14 and an exhaust passage 15.
  • the intake passage 14 and the exhaust passage 15 are opened and closed by a valve operating mechanism 20.
  • the valve mechanism 20 includes an intake valve 21 for opening and closing the intake passage 14, an intake side spring 22 for biasing the intake valve 21 to a closing side, an intake side rocker arm 23 for pressing the intake valve 21 to an opening side, and the intake side.
  • It comprises a side spring 27, an exhaust side rocker arm 28 which pushes the exhaust valve 26 to the open side, and an exhaust side rocker shaft 29 which supports the exhaust side rocker arm 28.
  • the exhaust side rocker arm 28 is also rocked by the cam shaft 25.
  • the lower part of the intake valve 21 and the exhaust valve 26 is the top of the combustion chamber (hereinafter simply referred to as the combustion chamber 31).
  • the intake side spring seat 32 and the exhaust side spring seat 33 are formed by machining a cast product (reference numeral 40 in FIG. 2).
  • the intake side valve seat 34, the intake side valve guide 35 disposed thereabove, the exhaust side valve seat 36 and the exhaust side valve guide 37 disposed above the machined part after machining the cast product It fits on the castings.
  • the cast product 40 before machining is described based on FIG.
  • the cast product 40 for a cylinder head includes a combustion chamber 31, an intake passage 14 extending to the combustion chamber 31, an exhaust passage 15 extending from the combustion chamber 31, and a camshaft (FIG. 1, symbol 25) and the like, and has an upper recess 41 for storing the same.
  • the mold 50 has a lower mold 51, a left side mold 52, a right side mold 53, and an upper mold 54.
  • the lower mold 51 has a nest 90 at the center of the upper surface.
  • the nest 90 serves to form a combustion chamber (31 in FIG. 2).
  • the collapsible core 55 is passed to the nest 90 and the left side mold 52.
  • the collapsible core 55 plays a role in forming an intake passage (FIG. 2, reference numeral 14).
  • the collapsible core 56 is passed to the nest 90 and the right side mold 53.
  • the collapsible core 56 plays a role in forming an exhaust passage (15 in FIG. 2).
  • the casting method is preferably a low pressure casting method.
  • Low pressure casting is also referred to as low pressure mold casting.
  • a furnace is disposed below the mold, the furnace is filled with a molten metal, and a conduit extended from the mold is inserted into the molten metal. Then, a pressure of about (atmospheric pressure + 50 kPa) is applied to the upper surface of the molten metal. At this pressure, the molten metal is supplied to the mold through the conduit.
  • the degree of pressurization is called low pressure casting or low pressure mold casting because it is much lower pressure than die casting.
  • the nest 90 is an important part. This is because it is a component involved in the shape formation of the combustion chamber 31 which requires high accuracy. A method of manufacturing such a nest 90 will now be described.
  • a first die 61 As shown in FIG. 4A, a first die 61, a first lower punch 62 fitted to the first die 61 from below, and a first upper punch 63 disposed above the first lower punch 62.
  • the first forming die 60 is prepared. Then, the metal mixed powder 64 as a powder containing tungsten as a main material is put into the first die 61.
  • the metal mixed powder 64 is preferably a mixture of tungsten powder 65 as a main material and nickel powder 66 as an auxiliary material.
  • the main material may be molybdenum powder or tungsten carbide powder, or a mixture of these.
  • the mixing ratio may be 80 to 99% by mass of the main material, and the balance may be an auxiliary material.
  • the metal mixed powder 64 in the first die 61 is compressed by the first lower punch 62 and the first upper punch 63.
  • the first green compact 67 shown in FIG. 4C is obtained.
  • the first cooling passage 68 shown by an imaginary line in FIG. 4C may be formed simultaneously with the compacting in the first compacting step.
  • a groove-shaped first refrigerant passage 68 opened downward is formed in the first green compact 67 by machining.
  • first powder compact 67 and the second powder compact (FIG. 6, reference numeral 74) are sintered together to produce a tungsten-based sintered product, a groove (groove shape) is formed in the first powder compact 67.
  • the first refrigerant passage 68 can be formed by forming the first refrigerant passage 68) and closing the opening of the groove with the second green compact. Since the groove of the first green compact 67 is open, it can be easily formed in the first green compact 67.
  • the first refrigerant passage 68 may embed the solid wax of the same shape in the first green compact 67 and melt and discharge it after the green compacting process.
  • FIG. 5 (b) which is a view on arrow b of FIG. 5 (a)
  • the first refrigerant passage 68 is a spiral passage.
  • the center of the vortex is the inlet 68a, and the portion farthest from the center is the outlet 68b.
  • Such a first refrigerant passage 68 is provided with a spiral projection on the upper surface of the first lower punch 62 shown in FIG. 4A, in addition to the machining method using a cutting tool.
  • the first refrigerant passage 68 may also be formed in the process of obtaining In this case, the first forming step of obtaining the first green compact 67 and the step of forming the first refrigerant passage are simultaneously performed in parallel.
  • a second die 71 a second lower punch 72 fitted to the second die 71 from below, and a second upper punch disposed above the second lower punch 72.
  • a second mold 70 is prepared. Then, the metal mixed powder 64 is put into the second die 71.
  • the metal mixed powder 64 is made of the same material as the component of the first green compact (FIG. 4, reference numeral 64).
  • the second green compact 74 is provided with a second refrigerant passage 75 by machining.
  • the second refrigerant passage 75 includes, for example, a long first horizontal hole 75a, a first vertical hole 75b obliquely rising from the tip of the first horizontal hole 75a, and a short second horizontal hole 75c provided on the opposite side of the first horizontal hole 75a. It consists of the 2nd vertical hole 75d which stands up from the tip of this 2nd horizontal hole 75c.
  • the second coolant passage 75 may be formed by embedding the solid wax of the same shape in the second green compact 74 and melting and discharging it after the green compacting process.
  • the first green compact 67 is stacked on the second green compact 74.
  • the boundary between the first green compact 67 and the second green compact 74 is a boundary 77.
  • the first vertical hole 75b is connected to the inlet 68a of the first refrigerant passage 68
  • the second vertical hole 75d is connected to the outlet 68b of the first refrigerant passage 68.
  • the stack 78 is placed in a sintering furnace 80 and subjected to a liquid phase sintering process.
  • the sintering furnace 80 includes, for example, a cylindrical container 81, a heat insulating material 82 lined in the container 81, a heater 83 disposed in the container 81, and a vacuum pump 84 for evacuating the container 81. .
  • a carbon fiber can be used for the heat insulating material 82, and a carbon rod can be used for the heater 83.
  • the carbon rod performs red heat and plays a role of heater only by energizing.
  • the liquid phase sintering process may be performed in an inert gas (argon gas, nitrogen gas) atmosphere as well as in vacuum.
  • the sintering furnace 80 is not limited to the vacuum sintering equipment.
  • the liquid phase sintering method is a processing method in which some components are dissolved during sintering and progress in a mixed state of liquid phase.
  • the explanation will be tried again based on the example.
  • the melting point of tungsten is 3380 ° C.
  • the melting point of nickel is 1453 ° C.
  • the inside of the container 81 is evacuated and kept at about 1500 ° C. by the heater 83. Then, the nickel powder on the low melting side is in the liquid phase, and the tungsten powder on the high melting side is in the solid phase, and the liquid phase sintering proceeds in the liquid phase mixed state.
  • a insert 90 as a tungsten-based or similar sintered product shown in FIG. 8A is obtained.
  • a coolant such as water or air
  • the coolant enters the first coolant passage 68 via the first vertical hole 75b, and is nested while passing through the first coolant passage 68. Cool 90 down to every corner.
  • the warmed refrigerant is discharged through the outlet 68b, the second vertical hole 75d, and the second horizontal hole 75c.
  • FIG. 8B is an enlarged view of a portion b of FIG. 8A and shows a cross section of a general portion of the nest 90.
  • the tungsten particles 91 are sintered in such a manner that the gaps are filled with the nickel melt 92.
  • FIG. 8C is an enlarged view of a portion c in FIG. 8A and shows the vicinity of the boundary between the outlet 68 b and the second vertical hole 75 d. As in FIG. 8 (b), the tungsten particles 91 are sintered in such a way that the gaps are filled with the nickel melt 92.
  • boundary layer will be unavoidably formed at the boundary between A sintered product and B sintered product.
  • the boundary layer generated by sintering performed twice is not preferable because it causes a decrease in strength.
  • the boundary layer can not be used because sintering is performed only once. That is, after the boundary 77 between the first green compact 67 and the second green compact 74 shown in FIG. 7A disappears, the bonding site is liquid-phase sintered in the same form as the general part, which is harmful. Boundary layer is not possible.
  • the insert 90 as a tungsten-based sintered product extends along the central axis 93.
  • the central axis 93 coincides with the movement axes of the first upper punch (FIG. 4, reference 63) and the second upper punch (FIG. 6, reference 73).
  • the first refrigerant passage 68 has a cross-sectional shape in which a straight bottom 68c and an inverted U-shaped wall 68d are combined.
  • first refrigerant passage 68 a part of the cooling passages (first refrigerant passage 68) has a straight bottom extending along an orthogonal line 94 orthogonal to the central axis 93. It has 68c.
  • the inverted U-shaped wall 68 d may be an inverted V-shaped wall or a U-shaped wall, and the shape is arbitrary.
  • FIGS. 8 (e) to 8 (f) The conventional bonding method will be described with reference to FIGS. 8 (e) to 8 (f) for comparison with the present invention.
  • a lower half 202 having a groove 201 and an upper half 204 having a groove 203 are prepared.
  • the lower half 202 and the upper half 204 are made of cast steel or machined mold steel.
  • the lower half 202 is overlaid with the upper half 204, and the discharge plasma pulse conduction method is performed. That is, when a high voltage is applied to the lower punch 205 and the upper punch 206, current concentrates on the boundary 207 between the lower half 202 and the upper half 204, and the boundary 207 is melted by resistance heating. The upper half 204 is fused to the lower half 202 by this melting.
  • a boundary layer 208 in which a good melting part and a partial melting part are mixed is formed at the boundary 207.
  • a crack is generated by thermal strain due to an external force or repeated thermal changes, and the incompletely melted portion of the boundary layer 208 becomes a base point of the fracture and causes a leak of cooling water. Therefore, there is a risk that the upper half 204 may break from the lower half 202 with a force less than a predetermined value. That is, in the comparative example, a desired bonding strength may not be obtained.
  • the boundary layer itself is not present.
  • the mechanical strength is sufficiently high.
  • the nest 90 according to the present invention maintains high thermal conductivity since the boundary layer itself does not exist.
  • the thermal conductivity of the cast steel or mold steel illustrated in FIG. 8E is about 50 W / (m ⁇ K).
  • the thermal conductivity of tungsten adopted in the present invention is 177 W / (m ⁇ K).
  • Tungsten has a thermal conductivity that is about three times larger, so that the cooling efficiency is improved, and the insert 90 can be cooled sufficiently and completely with a small amount of refrigerant.
  • the manufacturing method of the nest 90 described above can be summarized as a manufacturing method as described below.
  • the insert 90 is replaced with a tungsten-based sintered product and generalized.
  • a method of manufacturing a tungsten-based or similar sintered product comprises a powder mainly composed of at least one of tungsten, molybdenum and tungsten carbide (FIG. 4, metal mixed powder 64) and a first molding die (FIG. 4). , 60), a second forming die (FIG. 6, symbol 70), and a sintering furnace (FIG. 7, symbol 80).
  • a method of manufacturing a tungsten-based or similar sintered product includes a powder mainly composed of at least one of tungsten, molybdenum and tungsten carbide (FIG. 4, metal mixed powder 64), and a first forming die 4, a preparation step of preparing a second molding die (FIG. 6, 70) and a sintering furnace (FIG. 7, 80); The powder is charged into the first molding die and pressurized to obtain a first green compact (FIG. 4, reference numeral 67), and a first refrigerant for flowing the refrigerant into the first green compact.
  • Forming a passage (FIG. 5, symbol 68); Inserting the powder into the second mold and pressing it to obtain a second green compact (FIG. 6, reference numeral 74); Forming a second refrigerant passage (FIG. 6, reference numeral 75) for causing the refrigerant to flow through the second green compact; Obtaining a superimposed body (FIG. 7, reference numeral 78) by combining the first green compact with the second green compact so that the first refrigerant channel is connected to the second coolant channel; Obtaining a sintered product (FIG. 8, insert 90) by subjecting the stack to liquid phase sintering in the sintering furnace.
  • the face milling cutter 100 comprises a shank 101, a body 110 fixed to the tip of the shank 101, and a blade 103 attached to the front (bottom side in the figure) of the body 110.
  • a blade is attached to the blade 103, and the workpiece 104 is cut by this blade.
  • the coolant 106 is injected from the coolant supply pipe 105 between the workpiece 104 and the blade 103.
  • the blade 103 is cooled by the coolant 106.
  • Body 110 is indirectly cooled by coolant 106.
  • the coolant 106 is a cutting fluid which also serves as a coolant. Under the conditions of high load cutting by high speed rotation in recent years, temperature rise of the body 110 is concerned. Cooling by the coolant 106 is insufficient.
  • the shank 101 is provided with the refrigerant supply passage 111 and the refrigerant discharge passage 112, and the body 110 is provided with the first refrigerant passages 113a and 113b and the second refrigerant passage 114. It is done.
  • a body 110 is joined to the shank 101 by, for example, a brazing material 107 by brazing.
  • the second refrigerant passage 114 provided in the body 110 has an inlet 114a, an annular portion 114b, and an outlet 114c. And has a sufficiently complex shape.
  • the inlet portion 114a is connected to the refrigerant supply passage 111 via the first refrigerant passage 113a
  • the outlet portion 114c is connected to the refrigerant discharge passage 112 via the first refrigerant passage 113b.
  • the first green compact 67 shown in FIG. 11A is molded.
  • the first green compact 67 is compacted using at least one powder of tungsten, molybdenum and tungsten carbide as a main material.
  • the first green compact 67 is provided with first refrigerant passages 113a and 113b penetrating vertically.
  • a second green compact 74 shown in FIG. 11 (b) is molded.
  • the second green compact 74 is the same material as the first green compact 67.
  • the second green compact 74 is provided with a second refrigerant passage 114 whose upper surface is open.
  • the first green compact 67 is stacked on the second green compact 74, and the obtained superimposed body 78 is subjected to a liquid phase sintering process.
  • the obtained body 110 is shown in FIG.
  • the body 110 internally includes first refrigerant passages 113a and 113b and a second refrigerant passage 114, and does not internally include a boundary layer.
  • the second refrigerant passage 114 has an angular cross-sectional shape including a straight bottom 68c. That is, among the refrigerant passages consisting of the first refrigerant passages 113 a and 113 b and the second refrigerant passage 114, a part of the cooling passages (second refrigerant passage 114) is a straight line extending along an orthogonal line 94 orthogonal to the central axis 93. It has a bottom 68c.
  • a groove (a groove-shaped second coolant passage 114) is formed in the second powder compact 74.
  • the grooves of the second green compact 74 are opened before overlapping, so that the second green compact 74 can be easily formed.
  • the temperature of the body 110 rises.
  • the tungsten constituting the body 110 has a much higher thermal conductivity than steel, the heat is quickly absorbed by the refrigerant flowing through the second refrigerant passage 114. As a result, the temperature rise of the body 110 is suppressed.
  • the tungsten-based or similar sintered product of the present invention is suitable for the insert forming the combustion chamber of the cylinder head and the body of the face mill, but the insert for other molds and the like It may be a cutting tool of Thus, the use of tungsten-based or similar sintered products is optional.
  • the tungsten-based or similar sintered product of the present invention is optimum for the nesting to be attached to the mold for casting the cylinder head, as compared with other applications. It is safe to include partial types and cores in such nests.
  • the cutting tool may be a drill, a reamer, an end mill or the like in addition to a face milling cutter.
  • the present invention is more effective for a face milling cutter in which the body has a large diameter with respect to the shank and the coolant passage provided in the body is necessarily complicated.
  • tungsten powder and nickel powder were respectively prepared in the Example, tungsten powder which coated (or adhered) nickel to the grain of tungsten may be used.
  • tungsten powder which coated (or adhered) nickel to the grain of tungsten may be used.
  • FIG. 4A only tungsten powder (tungsten particles with nickel) is introduced into the first forming die 60. The same applies to FIG.
  • Carbon steel (Fe) has a melting point of 1540 ° C. and a thermal conductivity of about 50 W / (m ⁇ K).
  • tungsten has a melting point of 3400 ° C. and a thermal conductivity of 177 W / (m ⁇ K).
  • Molybdenum has a melting point of 2620 ° C. and a thermal conductivity of 139 W / (m ⁇ K).
  • tungsten carbide has a melting point of 2870 ° C. and a thermal conductivity of 84 W / (m ⁇ K).
  • a tungsten-based sintered product may be obtained by changing a tungsten powder to a molybdenum powder to obtain a molybdenum-based sintered product, or changing a tungsten powder to a tungsten carbide powder.
  • the present invention is suitable for a nest for attaching a mold for casting a cylinder head.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Powder Metallurgy (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

La présente invention concerne un produit fritté (90) à base de tungstène ou similaire contenant au moins un type parmi le tungstène, le molybdène et le carbure de tungstène en tant qu'ingrédient principal qui présente en son sein un passage (68, 75) de fluide frigorigène et aucune couche limite.
PCT/JP2018/042771 2017-12-22 2018-11-20 Procédé de fabrication d'un produit fritté à base de tungstène ou similaire et produit fritté à base de tungstène ou similaire WO2019123938A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2022036377A1 (fr) * 2020-08-20 2022-02-24 Plansee Se Insert de coulée et son procédé de production

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JP6527632B1 (ja) 2018-12-20 2019-06-05 本田金属技術株式会社 鋳造装置

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JPS5236729B2 (fr) * 1973-03-23 1977-09-17
JPH11515058A (ja) * 1995-10-31 1999-12-21 マサチューセッツ インスティチュート オブ テクノロジー 固体を利用せずに作製する金型の熱特性改善技術
JP2002514138A (ja) * 1996-10-25 2002-05-14 コンラート フリードリッヒ カーゲー 螺旋形の内部通路を備えた棒材を塑性素材から連続的に押出し加工するための方法及び装置
JP2005264277A (ja) * 2004-03-22 2005-09-29 Honda Motor Co Ltd 空隙を有する金属部材の製造方法
JP2008546554A (ja) * 2005-06-27 2008-12-25 ティーディーワイ・インダストリーズ・インコーポレーテッド 冷却体流路を有する複合物品および工具製造方法
JP2014133941A (ja) * 2013-01-11 2014-07-24 Hokuriku Seikei Kogyo Kk ノズル部材及びその製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5236729B2 (fr) * 1973-03-23 1977-09-17
JPH11515058A (ja) * 1995-10-31 1999-12-21 マサチューセッツ インスティチュート オブ テクノロジー 固体を利用せずに作製する金型の熱特性改善技術
JP2002514138A (ja) * 1996-10-25 2002-05-14 コンラート フリードリッヒ カーゲー 螺旋形の内部通路を備えた棒材を塑性素材から連続的に押出し加工するための方法及び装置
JP2005264277A (ja) * 2004-03-22 2005-09-29 Honda Motor Co Ltd 空隙を有する金属部材の製造方法
JP2008546554A (ja) * 2005-06-27 2008-12-25 ティーディーワイ・インダストリーズ・インコーポレーテッド 冷却体流路を有する複合物品および工具製造方法
JP2014133941A (ja) * 2013-01-11 2014-07-24 Hokuriku Seikei Kogyo Kk ノズル部材及びその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022036377A1 (fr) * 2020-08-20 2022-02-24 Plansee Se Insert de coulée et son procédé de production

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