WO2018225803A1 - 金型部品の製造方法、及び金型部品 - Google Patents
金型部品の製造方法、及び金型部品 Download PDFInfo
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- WO2018225803A1 WO2018225803A1 PCT/JP2018/021779 JP2018021779W WO2018225803A1 WO 2018225803 A1 WO2018225803 A1 WO 2018225803A1 JP 2018021779 W JP2018021779 W JP 2018021779W WO 2018225803 A1 WO2018225803 A1 WO 2018225803A1
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- Prior art keywords
- build
- mold part
- steel
- mold
- base material
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 82
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 24
- 238000005496 tempering Methods 0.000 claims description 18
- 230000003746 surface roughness Effects 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 15
- 238000000465 moulding Methods 0.000 description 12
- 239000002994 raw material Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 238000000748 compression moulding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 238000010030 laminating Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910000997 High-speed steel Inorganic materials 0.000 description 4
- 229910001315 Tool steel Inorganic materials 0.000 description 4
- 238000004663 powder metallurgy Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000003475 lamination Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000007500 overflow downdraw method Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001240 Maraging steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 238000009763 wire-cut EDM Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/34—Laser welding for purposes other than joining
- B23K26/342—Build-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- 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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/25—Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS]
-
- 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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- 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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/64—Treatment of workpieces or articles after build-up by thermal means
-
- 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
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- 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
- B22F5/007—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- 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
- B22F7/062—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 involving the connection or repairing of preformed parts
- B22F2007/068—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 involving the connection or repairing of preformed parts repairing articles
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- 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
- B22F2202/00—Treatment under specific physical conditions
- B22F2202/11—Use of irradiation
-
- 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
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/35—Iron
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the present invention relates to a mold part manufacturing method and a mold part.
- This application claims priority based on Japanese Patent Application No. 2017-112899 filed on Jun. 7, 2017, and incorporates all the contents described in the aforementioned Japanese application.
- a powder metallurgy mold (hereinafter sometimes simply referred to as “mold”) provided with mold parts such as a punch and a die is used.
- Raw material powder is put into a mold and compressed by a press machine.
- the green compact is directly used as a product and is sintered into a sintered part.
- steel materials having high hardness and excellent wear resistance are frequently used as mold base materials, and for example, tool steel such as high-speed steel is used (see Patent Documents 1 and 2).
- a method of manufacturing a mold part according to the present disclosure is as follows. Forming a first surface by removing a predetermined region including a worn portion from a worn mold part; and And a step of building up a steel material on the first surface.
- Mold parts according to the present disclosure are: A base material having a first surface; A built-up portion formed on the first surface of the base material, The build-up part has a laminated structure in which a plurality of layers made of steel are laminated.
- High-hardness steel has poor machinability and is not easy to cut. Therefore, for example, when using tool steel such as high-speed steel as a base material for mold parts, after rough processing in an annealed state, heat treatment (quenching and tempering) and tempering to a hardness of about 60 HRC, Mold parts are manufactured by finishing.
- the molding surface of mold parts wears out during repeated compression molding, causing sag.
- burrs are generated in the compression molded body, or the dimensional accuracy of the compression molded body is lowered and the surface properties are deteriorated.
- the worn part is removed, and the surface exposed by the removal is repaired by repairing the molded surface.
- the wear of the mold part reaches the use limit, it cannot be repaired because there is no allowance for removal, so the worn mold part is discarded and replaced with a new mold part. In that case, it is necessary to manufacture a new mold part from scratch. However, if a mold part is manufactured from scratch, a large cost and time are required.
- an object of the present invention is to provide a mold part manufacturing method for regenerating worn mold parts. Another object is to provide remanufactured mold parts.
- the mold part regeneration method and the mold part according to the present disclosure can reduce the manufacturing cost and the period of the mold by regenerating the worn mold part.
- a method for manufacturing a mold part according to an aspect of the present invention includes: Forming a first surface by removing a predetermined region including a worn portion from a worn mold part; and And a step of building up a steel material on the first surface.
- the manufacturing method of the mold part is to build up the steel part on the first surface formed by removing the area including the wear part from the worn mold part, thereby building up the area where the mold part is removed.
- the wear state of the mold parts can be improved. This makes it possible to regenerate the worn mold parts to the initial state or to an acceptable state for use, but not to manufacture the mold parts from scratch, compared with the case where the mold parts are manufactured from scratch. And the period can be reduced.
- the surface roughness of the first surface is formed to a maximum height Rz of 1 ⁇ m or less, and the first surface is made flat. Therefore, it is easy to form a built-up portion.
- Maximum height Rz is a value measured according to JIS B 0601-2001.
- the reference length when measuring the maximum height Rz is 0.1 mm, and the evaluation length is 2.0 mm.
- the build-up step is performed by sequentially laminating the steel powder on the first surface and irradiating the powder with a laser so that the build-up portion is formed. It is formed.
- the Vickers hardness of the build-up portion formed by the build-up process is 90% or more of the Vickers hardness of the base material of the mold part. Is mentioned.
- the build-up part has a hardness equal to or higher than the base material of the mold part. It is possible to ensure deformation resistance and wear resistance comparable to new mold parts.
- the steel material is quenched and tempered steel, and includes a step of tempering the built-up mold part after the build-up step. It is done.
- the build-up part is formed by melting and solidifying the steel material.
- the build-up portion becomes a structure close to a hardened state by rapidly solidifying the molten steel material. In the quenched state, it is brittle and the toughness may be insufficient. Therefore, the tempering treatment can increase the toughness of the built-up portion and improve the fracture resistance.
- the structure of the build-up part is defined as the base material by tempering the mold part on which the build-up part is formed.
- the tissues can be substantially the same. This is preferable because the mechanical properties of the entire mold part can be homogenized.
- the mold part may be a punch.
- the above-described mold part manufacturing method can be suitably used to regenerate a worn punch.
- a mold part according to an aspect of the present invention is A base material having a first surface; A built-up portion formed on the first surface of the base material, The build-up part has a laminated structure in which a plurality of layers made of steel are laminated.
- the mold part has a built-up portion on the first surface of the base material. According to the above-mentioned mold part, the wear state of the mold part can be improved by the build-up portion, and the production cost and period of the mold can be reduced compared with the case where the mold part is manufactured from scratch. Can do.
- the method of manufacturing a mold part according to the embodiment includes a pretreatment step of forming a first surface by removing a predetermined region from a worn mold part, and a build-up portion by depositing a steel material on the first surface. And a build-up process to be formed.
- One of the features of the method of manufacturing a mold part according to the embodiment is to restore the mold part to the initial shape before wear by building up a steel material on the first surface formed on the worn mold part. Or it is in the point which approaches the initial shape before wear.
- each step will be described in detail.
- the pretreatment step is a step of forming a first surface by removing a predetermined region including a worn portion from a worn mold part.
- the mold part of this example is a part that constitutes a powder metallurgy mold used for compression molding of raw material powder, and examples thereof include a punch and a die.
- a steel material is used as the base material of the mold part, and typically, tool steel such as high-speed steel or die steel can be suitably used.
- the raw material powder to be compression-molded include use of metal powder such as iron, aluminum, or an alloy thereof, ceramic powder such as alumina, and the like.
- a lubricant may be added to the raw material powder for the purpose of improving the lubricity during compression molding.
- the molding pressure at the time of compression molding is, for example, 500 MPa or more, more preferably 600 MPa or more, from the viewpoint of increasing the density of the green compact formed by compressing the raw material powder.
- the density of the green compact is, for example, 6.5 g / cm 3 or more and 7.2 g / cm 3 or less.
- the end surface including the worn molding surface is cut out by a predetermined length, so that the end surface becomes the first surface.
- the first surface is a surface that is built up in a later step, it is preferably formed on a flat surface.
- the surface roughness of the first surface is, for example, 1 ⁇ m or less at the maximum height Rz.
- region of metal parts can be performed by machining, such as grinding processes, such as cutting, such as milling, wire cut electrical discharge machining, and plane polishing, for example.
- the build-up process is a process of forming a build-up part by building up a steel material on the first surface. As a result, the mold part is restored to the initial shape before wear or brought closer to the initial shape before wear.
- the build-up is a method in which a steel material is melted and solidified to form a build-up portion.
- thermal spraying, plasma powder build-up, laser powder build-up, etc. can be used.
- Laser powder build-up is a so-called powder bed fusion method in which steel powder is sequentially laminated and irradiated to melt and solidify, and laser powder is irradiated and melted to solidify.
- laser metal deposition method There is a so-called laser metal deposition method.
- the build-up of the powder bed fusion method can be performed using a commercially available metal 3D printer (for example, OPM250L manufactured by Sodick Co., Ltd.).
- the steel material used for the build-up portion may be the same type of steel material as the base material of the mold part, or may be a different type of steel material.
- quenching and tempering steel, stainless steel, maraging steel or the like is used. be able to.
- Hardened and tempered steel includes tool steel such as high-speed steel and die steel.
- the Vickers hardness of the built-up part is 90% or more of the Vickers hardness of the base material of the mold part.
- a steel material used for the build-up portion it is possible to select a steel type having a hardness of 90% or more of the hardness of the base material.
- the Vickers hardness of the build-up portion is more preferably 95% or more of the Vickers hardness of the base material.
- the upper limit of the Vickers hardness of the built-up part is not particularly limited, but steel materials tend to have lower toughness as the hardness is higher.
- the Vickers hardness of the base material is 140% or less, and further 120% or less. Can be mentioned.
- the build-up portion may be finished to correct the dimensional error of the build-up portion.
- the finishing process include machining such as cutting such as milling, electric discharge machining such as wire cutting, and grinding such as planar polishing.
- tempering process When the steel material used for the build-up part is quenching and tempering steel, a tempering process for tempering the mold part on which the build-up part is formed may be provided after the build-up process.
- the build-up portion When the build-up portion is formed of quenched and tempered steel, the build-up portion has a structure close to a quenched state. Therefore, tempering can increase the toughness of the build-up portion and improve the fracture resistance.
- the structure of the build-up part is made substantially the same structure as the base material by tempering, and the entire mold part Can be homogenized. In the case of tempering, finishing is preferably performed on the built-up portion as necessary after tempering.
- a mold part 100 shown in FIG. 2 includes a base material 4 having a first surface 3 and a built-up portion 2 formed on the first surface 3 of the base material 4.
- the build-up part 2 has a laminated structure 22 in which a plurality of layers 21 made of steel are laminated.
- the mold part 100 can be manufactured by the mold part manufacturing method described above.
- the base material 4 in this example is a steel material.
- the first surface 3 of the base material 4 is preferably formed with a surface roughness (maximum height Rz) of 1 ⁇ m or less by, for example, surface grinding before forming the build-up portion 2.
- the build-up portion 2 is directly joined to the first surface 3 of the base material 4.
- the build-up portion 2 of this example forms a layer on the first surface 3 of the base material 4 in which steel powder is spread in layers, and the powder layer is irradiated with a laser to be melted and solidified. It is formed by repeatedly laminating.
- layers of steel material powder melted and solidified are stacked to form a laminated structure 22 in which a plurality of layers 21 made of steel material are laminated, as shown in FIG.
- the thickness of each layer 21 depends on the particle diameter of the steel powder used, and is, for example, 10 ⁇ m or more and 100 ⁇ m or less, and further 20 ⁇ m or more and 60 ⁇ m or less.
- the composition of the steel material forming the build-up portion 2 may be the same as or different from the composition of the steel material of the base material 4.
- the build-up portion 2 When the build-up portion 2 is formed using powder of a steel material having a composition different from that of the steel material of the base material 4, the build-up portion 2 having a composition different from that of the steel material of the base material 4 is formed. In the vicinity of the interface with the base material 4 in the build-up portion 2, the composition of the base material 4 diffuses, resulting in a gradient composition. Specifically, the layer 21 closer to the first surface 3 of the base material 4 in the build-up part 2 contains more components of the base material 4 and becomes closer to the composition of the base material 4, and the difference in composition between the layers 21 is Become prominent. Therefore, as shown in FIG.
- the layer 21 closer to the first surface 3 of the base material 4 in the built-up portion 2 becomes clearer because of the difference in composition, and the layer separated from the first surface 3.
- the boundary between the layers 21 is blurred.
- the denser the hatching of each layer 21 of the built-up portion 2 the more the components of the base material 4 are contained, indicating that the composition of the base material 4 is closer, and the boundary line of each layer 21 changes from a thick solid line to a thin broken line It shows that the boundary of each layer 21 becomes unclear.
- the build-up part 2 is formed using the powder of the steel material having the same composition as the steel material of the base material 4, the build-up part 2 having the same composition as the steel material of the base material 4 is formed.
- the composition between the layers 21 is uniform. Therefore, the boundary between the layers 21 due to the difference in composition becomes unclear compared to the case where the build-up portion 2 having a composition different from that of the steel material of the base material 4 is formed.
- the mold part manufacturing method according to the above-described embodiment has the following effects.
- the wear state of the mold parts by embedding the removed areas of the mold parts to restore the mold parts to the initial shape before wear, or by bringing them closer to the initial shape before wear. it can.
- the mold part can be restored to the initial state before wear. This makes it possible to regenerate the worn mold parts to the initial state or to an acceptable state for use, but not to manufacture the mold parts from scratch, compared with the case where the mold parts are manufactured from scratch. And the period can be reduced.
- the first surface is formed in the region where the mold parts are removed in the pretreatment step before the build-up step, and the first surface is made flat, so that the build-up portion can be easily formed.
- the mold part according to the embodiment described above has the following effects.
- the built-up portion has a laminated structure in which a plurality of layers are laminated, a built-up portion having a uniform thickness is easily formed.
- Test Example 1 The mold part manufacturing method according to the above-described embodiment is performed on the used punch, and the punch is regenerated by forming a build-up portion on the end surface (first surface) of the punch.
- the punch was evaluated.
- the prepared punch is a lower punch that constitutes a metal mold for powder metallurgy together with a die, and is slidably fitted into a hole of the die.
- the material of the punch (base material) is die steel (SKD11), which is quenched and tempered steel.
- the Vickers hardness is 579 HV (0.1). “HV (0.1)” means that the load (test force) was measured at 0.1 kgf (0.9807 N) in accordance with JIS Z 2244: 2009. As shown in FIG.
- the punch has a cylindrical shape and is formed with a through hole 10 penetrating in the axial direction.
- a core rod (not shown) is inserted into the through hole 10.
- a punch 1 shown in FIG. 1 is a molding surface 11 that is fitted with a die hole at an end portion (upper side in FIG. 1) and presses the raw material powder when the end surface is compression-molded.
- the outer diameter of the molding surface 11 is 23.96 mm and the inner diameter is 14.99 mm.
- Test Example 1 As shown in FIG. 1, after forming the first surface 3 by cutting and removing the tip of the used punch 1 perpendicular to the axis of the punch 1 by wire cutting, the base material 4 The first surface 3 was subjected to surface grinding so that the surface roughness (maximum height Rz) of the first surface 3 was 1 ⁇ m or less. Thereafter, SUS420J2 (quenched and tempered steel) was built up on the first surface 3 to form the built-up portion 2, thereby restoring the initial shape.
- SUS420J2 quenched and tempered steel
- a thickness of 20 mm is applied to the first surface 3 obtained by cutting perpendicularly to the axis of the punch 1 at a position 20 mm in the axial direction from the forming surface 11 of the punch 1 in the initial shape and subjecting the cut surface to surface grinding. 1 was formed.
- the build-up portion is obtained by using a metal 3D printer (OPM250L manufactured by Sodick Co., Ltd.) and sequentially laminating and solidifying the SUS420J2 powder on the first surface 3 of the base material 4 by laser irradiation. 2 was layered.
- the “average particle diameter” means a particle diameter at which the cumulative volume in the volume particle size distribution measured by a laser diffraction particle size distribution analyzer is 50%. That is, the median diameter (D50).
- the tempering process was performed, and after the tempering process, the build-up part 2 was finished and the molding surface 11 was formed.
- the tempering conditions were 180 ° C. ⁇ 1 hour.
- the regenerated punch was attached to a press, and the raw material powder was compression-molded to form 100 ring-shaped green compacts.
- raw material powder pure iron powder (average particle diameter: 100 ⁇ m) mixed with copper powder at a ratio of 1.5 mass% and graphite powder at a ratio of 0.6 mass% is used, and the molding pressure is 588 MPa (6 t). / Cm 2 ), and the density of the green compact was 6.7 g / cm 3 . All the green compacts that were molded satisfied the predetermined dimensional accuracy, and the end face shape was also good.
- the punch was removed from the press machine after molding and the dimensional change of the punch before and after molding was examined, the build-up portion was not deformed or worn, and was sufficiently durable.
- the Vickers hardness of the built-up part in the punch after molding was measured at three points, and the average value was obtained. As a result, the Vickers hardness of the built-up portion was 615 HV (0.1).
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Abstract
Description
本出願は、2017年6月7日付の日本国出願の特願2017-112899号に基づく優先権を主張し、前記日本国出願に記載された全ての記載内容を援用するものである。
摩耗した金型部品から摩耗箇所を含む所定領域を除去することにより第一面を形成する工程と、
前記第一面に鋼材を肉盛りする工程と、を備える。
第一面を有する母材と、
前記母材の第一面上に形成された肉盛り部と、を備え、
前記肉盛り部は、鋼材で形成された複数の層が積層された積層構造を有する。
摩耗した金型部品を再生して再使用することが望まれる。
本開示に係る金型部品の再生方法、及び金型部品は、摩耗した金型部品を再生することで、金型の製作コスト及び期間を低減することができる。
最初に本発明の実施態様を列挙して説明する。
摩耗した金型部品から摩耗箇所を含む所定領域を除去することにより第一面を形成する工程と、
前記第一面に鋼材を肉盛りする工程と、を備える。
第一面を有する母材と、
前記母材の第一面上に形成された肉盛り部と、を備え、
前記肉盛り部は、鋼材で形成された複数の層が積層された積層構造を有する。
本発明の実施形態に係る金型部品の製造方法、及び金型部品の具体例を以下に説明する。本発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。
実施形態に係る金型部品の製造方法は、摩耗した金型部品から所定領域を除去して第一面を形成する前処理工程と、前記第一面に鋼材を肉盛りして肉盛り部を形成する肉盛り工程とを備える。実施形態に係る金型部品の製造方法の特徴の1つは、摩耗した金型部品に形成した第一面に鋼材を肉盛りすることにより、金型部品を摩耗前の初期形状に復元する、又は摩耗前の初期形状に近づける点にある。以下、各工程について詳しく説明する。
前処理工程は、摩耗した金型部品から摩耗箇所を含む所定領域を除去することにより第一面を形成する工程である。
肉盛り工程は、第一面に鋼材を肉盛りすることにより肉盛り部を形成する工程である。これにより、金型部品を摩耗前の初期形状に復元する、又は摩耗前の初期形状に近づける。
肉盛り部に使用する鋼材が焼入れ焼戻し鋼である場合は、肉盛り工程の後、肉盛り部が形成された金型部品を焼戻し処理する焼戻し工程を備えてもよい。焼入れ焼戻し鋼で肉盛り部を形成した場合は、肉盛り部が焼入れ状態に近い組織になるため、焼戻し処理することで、肉盛り部の靭性を高め、耐欠損性を向上させることができる。特に、金型部品の母材の鋼種が肉盛り部と同じ焼入れ焼戻し鋼である場合は、焼戻し処理することで、肉盛り部の組織を母材と実質的に同じ組織とし、金型部品全体の機械的特性を均質化することができる。焼戻し処理する場合は、焼戻し処理後に必要に応じて、肉盛り部に仕上げ加工を行うとよい。
図2参照して、実施形態に係る金型部品を説明する。図2に示す金型部品100は、第一面3を有する母材4と、母材4の第一面3上に形成された肉盛り部2と、を備える。肉盛り部2は、鋼材で形成された複数の層21が積層された積層構造22を有する。金型部品100は、上述した金型部品の製造方法により製造することができる。
本例の母材4は、鋼材である。母材4の第一面3は、肉盛り部2を形成する前に、例えば平面研削加工などにより、表面粗さ(最大高さRz)を1μm以下に形成しておくことが好ましい。
肉盛り部2は、母材4の第一面3に直接接合されている。本例の肉盛り部2は、母材4の第一面3上に、鋼材の粉末を層状に敷き詰め、その粉末の層にレーザを照射して溶融し凝固させた層を形成し、これを繰り返して積層することにより形成されている。この場合、鋼材の粉末が溶融し凝固した層が積み重なり、図2に示すように、鋼材で形成された複数の層21が積層された積層構造22が形成される。各層21の厚さは、使用する鋼材の粉末の粒子径などに依存し、例えば10μm以上100μm以下、更に20μm以上60μm以下である。肉盛り部2を形成する鋼材の組成は、母材4の鋼材の組成と同じであってもよいし、異なってもよい。
上述した実施形態に係る金型部品の製造方法は、次の効果を奏する。
上述した実施形態に係る金型部品は、次の効果を奏する。
使用済みとなったパンチに対して上述した実施形態に係る金型部品の製造方法を実施して、パンチの端面(第一面)に肉盛り部を形成することによりパンチを再生し、この再生したパンチについて評価した。用意したパンチは、ダイと共に粉末冶金用金型を構成する下パンチであり、ダイの孔に摺動自在に嵌合される。パンチ(母材)の材質はダイス鋼(SKD11)であり、焼入れ焼戻し鋼である。ビッカース硬さは579HV(0.1)である。「HV(0.1)」は、JIS Z 2244:2009に準拠して、荷重(試験力)0.1kgf(0.9807N)で測定したことを意味する。パンチの形状は、図1に示すように、円筒状になっており、軸方向に貫通する貫通孔10が形成されている。この貫通孔10には、コアロッド(図示せず)が挿通される。図1に示すパンチ1は、先端側(図1の上側)の端部がダイの孔に嵌合され、その端面が原料粉を圧縮成形する際に原料粉を押圧する成形面11である。この例では、成形面11の外径が23.96mm、内径が14.99mmである。
10 貫通孔
11 成形面
2 肉盛り部
3 第一面
4 母材
100 金型部品
21 層
22 積層構造
Claims (7)
- 摩耗した金型部品から摩耗箇所を含む所定領域を除去することにより第一面を形成する工程と、
前記第一面に鋼材を肉盛りする工程と、を備える金型部品の製造方法。 - 前記第一面の表面粗さを最大高さRzで1μm以下に形成する請求項1に記載の金型部品の製造方法。
- 前記肉盛りする工程は、前記鋼材の粉末を前記第一面上に順次積層し、前記粉末にレーザを照射することにより肉盛り部が形成される請求項1又は請求項2に記載の金型部品の製造方法。
- 前記肉盛りする工程によって形成された肉盛り部のビッカース硬さを前記金型部品の母材のビッカース硬さの90%以上とする請求項1から請求項3のいずれか1項に記載の金型部品の製造方法。
- 前記鋼材が焼入れ焼戻し鋼であり、前記肉盛りする工程の後、肉盛りされた前記金型部品を焼戻し処理する工程を備える請求項1から請求項4のいずれか1項に記載の金型部品の製造方法。
- 前記金型部品がパンチである請求項1から請求項5のいずれか1項に記載の金型部品の製造方法。
- 第一面を有する母材と、
前記母材の第一面上に形成された肉盛り部と、を備え、
前記肉盛り部は、鋼材で形成された複数の層が積層された積層構造を有する金型部品。
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JP2019523956A JPWO2018225803A1 (ja) | 2017-06-07 | 2018-06-06 | 金型部品の製造方法、及び金型部品 |
KR1020197035777A KR20200016234A (ko) | 2017-06-07 | 2018-06-06 | 금형 부품의 제조 방법 및 금형 부품 |
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JPH0475726A (ja) * | 1990-06-28 | 1992-03-10 | Nissan Motor Co Ltd | 金型の補修方法 |
JP2008254025A (ja) * | 2007-04-05 | 2008-10-23 | Technocoat Co Ltd | ワイヤ供給用ホルダ |
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JPH0913177A (ja) * | 1995-06-29 | 1997-01-14 | Tokushu Denkyoku Kk | サーメット肉盛り金属部品及びその製造方法 |
JP2009012039A (ja) | 2007-07-04 | 2009-01-22 | Sumitomo Electric Ind Ltd | 粉末成形用金型、該粉末成形用金型を用いて成形した成形体および焼結体 |
JP2009120918A (ja) | 2007-11-16 | 2009-06-04 | Sumitomo Denko Shoketsu Gokin Kk | 焼結部品の製造方法 |
CN105081575A (zh) * | 2013-06-29 | 2015-11-25 | 丁雪强 | 模具表面的激光修复方法 |
CN104762617A (zh) * | 2013-06-29 | 2015-07-08 | 苏州唐氏机械制造有限公司 | 模具的激光修复方法 |
CN106735205B (zh) * | 2016-12-08 | 2018-12-18 | 鑫精合激光科技发展(北京)有限公司 | 一种金属材料3d打印的工艺参数确定方法 |
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JPS57118830A (en) * | 1981-01-16 | 1982-07-23 | Toshiba Corp | Manufacture of metallic die |
JPH0475726A (ja) * | 1990-06-28 | 1992-03-10 | Nissan Motor Co Ltd | 金型の補修方法 |
JP2008254025A (ja) * | 2007-04-05 | 2008-10-23 | Technocoat Co Ltd | ワイヤ供給用ホルダ |
JP2016117276A (ja) * | 2014-12-18 | 2016-06-30 | ゼネラル・エレクトリック・カンパニイ | ハイブリッド部品用のハイブリッド積層造形された特徴を用いたハイブリッド積層造形方法 |
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WO2021244929A1 (de) * | 2020-06-02 | 2021-12-09 | HS 3D Performance GmbH | Formenteil |
EP4157601A1 (de) * | 2020-06-02 | 2023-04-05 | HS 3D Performance GmbH | Formenteil |
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