WO2008004311A1 - Procédé de fabrication de moules et procédés de fabrication d'articles moulés et de produits en acier - Google Patents

Procédé de fabrication de moules et procédés de fabrication d'articles moulés et de produits en acier Download PDF

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Publication number
WO2008004311A1
WO2008004311A1 PCT/JP2006/313617 JP2006313617W WO2008004311A1 WO 2008004311 A1 WO2008004311 A1 WO 2008004311A1 JP 2006313617 W JP2006313617 W JP 2006313617W WO 2008004311 A1 WO2008004311 A1 WO 2008004311A1
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WIPO (PCT)
Prior art keywords
molding die
joined body
producing
manufacturing
steel
Prior art date
Application number
PCT/JP2006/313617
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English (en)
Japanese (ja)
Inventor
Toshiaki Kitazawa
Takayuki Fujimori
Original Assignee
Toshiaki Kitazawa
Takayuki Fujimori
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiaki Kitazawa, Takayuki Fujimori filed Critical Toshiaki Kitazawa
Priority to PCT/JP2006/313617 priority Critical patent/WO2008004311A1/fr
Priority to JP2008523588A priority patent/JP5149797B2/ja
Publication of WO2008004311A1 publication Critical patent/WO2008004311A1/fr

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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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below

Definitions

  • the present invention relates to a method for manufacturing a molding die, a molded product, and a method for manufacturing a steel product.
  • a molding die having a heat exchange medium flow path formed therein is known. According to such a molding die, the heat exchange medium can be passed through the heat exchange medium flow path formed inside the molding die, so that the molding die can be used when molding a molded product. Heating and cooling can be performed efficiently.
  • FIG. 9 and FIG. 10 are diagrams for explaining a conventional method of manufacturing a molding die.
  • 9 (a) is a cross-sectional view of the steel members 912 and 914
  • FIG. 9 (b) is a bottom view of the steel member 914
  • FIG. 9 (c) is a cross-sectional view of the molding die 910.
  • a conventional method of manufacturing a molding die is to join a steel member 912 and a steel member 914 formed with a heat exchange medium flow channel groove 934 into surfaces 922,
  • the first heat treatment step S 912 is brought into contact with each other at 924 and heated to and maintained at an austenite region temperature (for example, 1050 ° C.), and the steel members 912 and 914 are cooled to a temperature lower than the austenite region temperature after cooling.
  • the steel members 912 and 914 are joined to form the heat exchange medium flow path 930 inside. It becomes possible to form a joined body.
  • the second heat treatment step S914 voids that may remain on the joint surface 926 are eliminated, and the above-mentioned joined body is firmly joined to the steel members 91 2 and 914 and has excellent mechanical strength. A joined body can be obtained. As a result, it is possible to manufacture the molding die 910 having the heat exchange medium flow path 930 formed therein and having excellent mechanical strength.
  • Patent Document 1 Japanese Patent Laid-Open No. 11 151581 Disclosure of the invention
  • the present invention has been made to solve such a problem, and when a steel material containing Cr is used as a material for a molding die, the durability of the molding die is conventionally improved. It is an object of the present invention to provide a method for producing a molding die that can be made higher than the above. Another object of the present invention is to provide a molded product manufactured using a molding die manufactured using the molding die manufacturing method of the present invention. Furthermore, the present invention provides a method for manufacturing a steel product that can increase the durability of the steel product as compared with the conventional steel product when a steel material containing Cr is used as the material of the steel product. Objective.
  • the inventors of the present invention cause the above problem, that is, when a steel material containing Cr is used as the material for the molding die, the molding is performed too much.
  • the cause is as follows.
  • the inventors of the present inventor are affected by heat during molding if the metal structure of the joined body is changed to a metal structure that can withstand the forming temperature in advance.
  • the metal structure of the joined body hardly changes, even if an internal stress is generated by a cooling cycle with a large pressure or a large temperature difference during molding, it is possible to suppress the fracture of the joint surface due to the internal stress.
  • the present inventors have found that the above problems can be solved and have completed the present invention.
  • a plurality of steel members made of a steel material containing Cr are mutually!
  • a method of manufacturing a molding die that uses a joined body joined to a heel V to prepare a molding die, and prepares a joined body in which a plurality of steel members including Cr-containing steel material force are joined together.
  • a joined body preparing step a quenching process for performing a quenching process on the joined body, and heating the joined body to a predetermined temperature, thereby changing the metal structure of the joined body into a metal structure that can withstand a molding temperature.
  • a metal structure heat-resisting step to be prepared in this order.
  • the metal structure of the joined body is preliminarily changed to a metal structure that can withstand the molding temperature by performing a metal structure heat resistance step.
  • the metal structure of the joined body hardly changes even under the influence of heat during molding.
  • the “metal structure that can withstand the molding temperature” means “a metal structure whose structure hardly changes even under the influence of heat during molding”. is there.
  • Patent Document 1 described above is characterized by further performing a third heat treatment step including a quenching process and a tempering process after performing a conventional molding die manufacturing method. Other methods for producing molding dies are described (see Patent Document 1 (Example E2)).
  • the tempering process in the third heat treatment step is only performed at a temperature of 550 ° C. It is difficult to change the metal structure of the joined body into a metal structure that can withstand the forming temperature in advance. For example, if the molding die to be manufactured is an aluminum die-casting die, the metal structure of the joined body will be the result of tempering at about 550 ° C as in other conventional molding die manufacturing methods. Can not be changed in advance to a metal structure that can withstand the forming temperature (around 660 ° C).
  • the quenching step and the metal structure heat treatment step be performed in a vacuum or in an inert gas atmosphere.
  • an active gas such as oxygen
  • the joined body is cooled in an inert gas atmosphere or in the air after the metal structure heat-resisting step.
  • the predetermined temperature is preferably in the range of 600 ° C to 850 ° C.
  • the metal structure of the joined body can withstand the molding temperature when forming an aluminum product (for example, aluminum forging or aluminum forging). It is possible to change the metal structure in advance. For this reason, It can be suitably used when producing a molding die used at the molding temperature.
  • the predetermined temperature to 850 ° C or lower, it is possible to obtain a hardness that can be used as various molding dies (for example, the Cookwell C scale hardness HRC hardness is 10 or more). It becomes.
  • the predetermined temperature is preferably in the range of 660 ° C to 720 ° C.
  • a predetermined temperature is set to 660 ° C or more (near the molten metal temperature of aluminum), when forming an aluminum product (for example, aluminum forging or aluminum forging), the metal of the joined body. It becomes possible to change the structure into a metal structure that can sufficiently withstand the forming temperature.
  • a predetermined temperature for example, Rockwell C scale hardness HRC hardness of 28 or more
  • a hardness for example, Rockwell C scale hardness HRC hardness of 28 or more
  • the method further includes a surface treatment step of increasing the surface hardness of the joined body at a temperature equal to or lower than the predetermined temperature.
  • the method for producing a molding die of the present invention even if the hardness of the molding die as a bulk may be reduced by carrying out the metal structure heat-resisting step, the method as described above is adopted. As a result, the surface hardness of the molding die can be increased, and the durability of the molding die can be further increased.
  • the surface treatment process is performed at a temperature equal to or lower than a predetermined temperature. Therefore, the hardness of the joined body in the course of performing the surface treatment process. However, it will not drop more than necessary.
  • a diffusion treatment method or a coating treatment method can be used as the surface treatment method used in the surface treatment step.
  • a nitriding treatment method a soft nitriding treatment method, a boron immersion treatment method, a sulfurization treatment method or a nitrosulfurization treatment method can be used
  • a coating treatment method a vacuum deposition method, a sputtering method can be used.
  • physical vapor deposition such as ion plating or hard chrome plating.
  • the temperature equal to or lower than a predetermined temperature refers to a temperature equal to or lower than the maximum heating temperature in the metal structure heat resistance step.
  • the method further includes a coating layer forming step of forming a coating layer on the surface of the joined body at a temperature equal to or lower than the predetermined temperature.
  • the coating layer formed on the surface of the joined body firmly holds the joined body, so that it is possible to suppress the divergence due to the destruction of the joined surface, and the durability of the molding die. It becomes possible to further increase the property.
  • the joined body preparing step includes a steel member joining step of joining together a plurality of steel members made of a steel material containing Cr. It is a joined body manufacturing process, Comprising: The said joined body manufacturing process in these steel members
  • Corrected form (Rule 91) By joining the surfaces to be joined and heating the plurality of steel members to a first temperature at which the plurality of steel members can be joined while pressing the plurality of steel members under a predetermined pressure condition, the plurality of steel members are joined to form a joined body.
  • the joined body forming step to be formed, and the joined body is heated to a second temperature not lower than the A transformation point in the steel member and then gradually cooled to a temperature of not more than 600 ° C. It is preferable to include a process for strengthening the bonding strength.
  • the Cr-containing passive layer and the Z present on the bonding surface can be obtained.
  • the method for producing a molding die of the present invention makes it possible to produce a molding die using a joined body joined with a sufficiently high joining force, so that the durability of the molding die is further increased. It becomes possible to do.
  • the joined body in order to dissipate the Cr-containing passivating layer and Z or voids present on the joining surface and sufficiently increase the joining force, the joined body is made of a steel material A. It is necessary to heat to a second temperature above the transformation point and then slowly cool to a temperature below 600 ° C.
  • the Cr-containing passive layer and the Z or void existing on the joint surface are dissolved in the steel material of the parent phase in the process of transformation of the metal structure with slow cooling. As a result, the joining force can be made sufficiently high.
  • the joined body forming step and the joining force strengthening step are performed in a vacuum or in an inert gas atmosphere.
  • an active gas such as oxygen
  • the first temperature is preferably in the range of 850 ° C to 1100 ° C.
  • the joined body is gradually cooled after the joined body forming step.
  • the second temperature is preferably 100 ° C higher than the A transformation point and within a temperature range! /.
  • the joining force strengthening step is performed under a condition that it takes 5 hours or more to lower the temperature of the joined body to 600 ° C of the A transformation point force. It is preferable to reinforce the bonding force in the bonded body by gradually cooling to a third temperature of ° C or lower.
  • the third temperature is preferably 550 ° C or lower.
  • the metal structure of the joined body can be made more uniform between the joined body forming step and the joining force enhancing step. It is preferable to further include a metallographic structure homogenizing step of heating the joined body at 4 temperatures.
  • the metal structure homogenization step is performed between the joined body forming step and the joining force strengthening step, so that a non-uniform state is obtained through the joined body forming step. Since the metal structure can be made more uniform, it is possible to form a joined body with higher homogeneity.
  • the metallographic structure homogenization step is performed in a vacuum or in an inert gas atmosphere.
  • the fourth temperature is 1000 ° C to 1200 ° C.
  • the metal structure that has been in a non-uniform state after the joined body forming step can be made more uniform, so that a joined body with high homogeneity can be formed. Is possible.
  • the joined body is rapidly cooled to the Ms point after the metal structure homogenization step, and then the joined body is gradually cooled.
  • the joining scheduled surfaces in the plurality of steel members are flat surfaces.
  • the arithmetic average roughness Ra on the planned joining surface is 0.2 m or less.
  • a groove for forming a heat exchange medium flow path is formed on at least one surface of the plurality of steel members to be joined. It is preferable that
  • the plurality of steel members are heated by magnetic heating in the joined body forming step.
  • the bonded body forming step can be performed by external magnetic heating or energization heating (including pulse energization heating) by magnetic heating.
  • the joined body forming step can use a force servo motor to press a plurality of steel members using hydraulic pressure or air pressure. It is possible to press under a certain pressure condition, and as a result, it is possible to manufacture a high-quality joined body with low stress distortion.
  • Hot mold steel is a steel material suitable for a molding die, but is a steel material containing Cr, so that a sufficiently high joining is achieved by using a conventional molding die manufacturing method. It is difficult to gain power.
  • a molding die pre-forming step for roughing the joined body between the joined body preparing step and the quenching step is preferable that the method further includes a molding die forming step of performing a finishing process on the joined body to form a molding die after performing the metal structure heat resistance step.
  • the bonded body is heated before the quenching step. Therefore, the bonded body is in a state where the workability before the hardness of the bonded body is increased is good. It is possible to perform roughing.
  • the finishing process is performed after the metal structure heat-resisting process accompanied by the change of the metal structure, it is possible to manufacture a molding die with high dimensional accuracy and good surface condition.
  • the method for producing a molding die of the present invention further includes a molding die forming step of forming the molding die by performing machining of the joined body after the metal structure heat resistance step. It is preferable to include.
  • the molding die can be manufactured by one machining.
  • the joined body is to be machined after the metal structure heat-resisting process accompanied by a change in the metal structure, it becomes possible to manufacture a molding die with high dimensional accuracy and good surface condition. .
  • a molding die for forming a molding die by performing machining of the joined body between the joined body preparing step and the quenching step It is preferable to further include a mold forming step.
  • the molding die is preferably a molding die for metal molding.
  • the method for producing a molding die of the present invention is also applicable to a molding die for metal molding, a molding die for glass molding, a molding die for rubber molding, and a molding die for resin molding. However, it has a particularly excellent effect when the molding die is a metal molding die that is exposed to a high temperature during molding.
  • metal molds for metal forming aluminum products, zinc products, magnesium products
  • metal molds for metal forming aluminum products, zinc products, magnesium products
  • examples thereof include a forging die or a forging die for producing a metal product such as a brass product.
  • the molding die is a die for die casting.
  • the method for producing a molding die of the present invention is suitably applied to all of a die casting molding die, a low-pressure molding molding die, a gravity molding molding die, and other forging dies. However, it has a particularly excellent effect when the molding die is a die-casting molding die that requires a large pressure during molding.
  • Examples of the die casting die include an aluminum die casting die, a zinc die casting die, a magnesium die casting die, and a brass die casting die.
  • the molded product of the present invention is a molded product manufactured using a molded mold manufactured by using the method for manufacturing a molded mold of the present invention.
  • the molded product of the present invention is a molded product manufactured using a molding die having higher durability than the conventional one as described above, and therefore has high quality and low manufacturing cost. Become a molded product.
  • Examples of such molded products include various products such as aluminum, zinc, magnesium, and brass.
  • the method for producing a steel product of the present invention is a method for producing a steel product using a joined body in which a plurality of steel members made of a steel material containing Cr are joined to each other.
  • a metal structure heat-resisting step in which the metal structure of the joined body is changed in advance into a metal structure that can withstand the operating temperature by heating to a predetermined temperature.
  • the metal structure of the joined body is changed in advance to a metal structure that can withstand the operating temperature by performing a heat treatment for metal structure. Even under the influence of heat during use, the metal structure of the joined body hardly changes. As a result, even if internal stress occurs due to the harsh environment during use, It becomes possible to suppress the fracture of the joint surface due to internal stress, and the durability of the steel product can be made higher than before, as in the case of the above-described method for producing the molding die of the present invention.
  • the “metal structure that can withstand the operating temperature” refers to “a metal structure whose structure hardly changes even under the influence of heat during use”.
  • the steel product produced by the method for producing a steel product of the present invention becomes a steel product joined with a sufficiently high joining force, and can be used for various applications.
  • steel products include various tools and various structural materials.
  • the surface treatment step of increasing the surface hardness of the joined body at a temperature equal to or lower than the predetermined temperature is preferable that it contains further.
  • the surface treatment process is performed at a temperature equal to or lower than a predetermined temperature. Therefore, the hardness of the joined body is required in the process of performing the surface treatment process. It ’s not going to drop any more.
  • a steel product pre-forming step for roughing the joined body between the joined body preparing step and the quenching step, and the metal It is preferable that the method further includes a steel product forming step of forming a steel product by performing a finishing process on the joined body after performing the structure heat resistance step.
  • the bonded body is heated before the quenching step. Therefore, the bonded body is in a state where the workability before the hardness of the bonded body is increased is good. It is possible to perform roughing.
  • the metal structure heat-resisting process with changes in the metal structure, Since it is supposed to perform the uplifting process, it becomes possible to manufacture steel products with high dimensional accuracy and good surface condition.
  • the steel product forming step of forming the steel product by performing machining of the joined body after the metal structure heat-resisting step is performed. Further, it is preferable to include it.
  • the steel product can be manufactured by one machining.
  • the joined body is machined after the metal structure heat treatment process accompanied by a change in the metal structure, it is possible to manufacture a steel product with high dimensional accuracy and good surface condition.
  • FIG. 1 is a flowchart for explaining a method for manufacturing a molding die according to the first embodiment.
  • FIG. 2 is a view for explaining the manufacturing method of the molding die according to the first embodiment.
  • FIG. 3 is a view for explaining the method for manufacturing the molding die according to the first embodiment.
  • FIG. 4 is a view for explaining the manufacturing method of the molding die according to the first embodiment.
  • FIG. 5 is a view for explaining the manufacturing method of the molding die according to the first embodiment.
  • FIG. 6 is a flowchart for explaining a method for manufacturing a molding die according to the second embodiment.
  • FIG. 7 is a flowchart for explaining a method for manufacturing a molding die according to the third embodiment.
  • FIG. 8 is a flowchart for explaining a method for manufacturing a molding die according to the fourth embodiment.
  • FIG. 9 is a view for explaining a conventional method for producing a molding die.
  • FIG. 10 is a view for explaining a conventional method for producing a molding die.
  • Embodiment 1 is an embodiment for explaining a method for producing a molding die of the present invention.
  • An aluminum die casting mold will be described as an example of the molding mold.
  • FIG. 1 is a flow chart for explaining a method of manufacturing a molding die according to the first embodiment.
  • FIG. 2 is a view for explaining the manufacturing method of the molding die according to the first embodiment.
  • FIG. 3 is a view for explaining the method for manufacturing the molding die according to the first embodiment.
  • FIG. 4 is a view for explaining the method for manufacturing the molding die according to the first embodiment.
  • FIG. 4 (a) is a diagram showing the steel members 12 and 14 before the joined body forming step S112, and FIG. 4 (b) is a diagram showing the steel members 12 and 14 during the joined body forming step S112.
  • FIG. 4 (c) is a diagram showing the joined body 10 after the metallographic structure homogenizing step S114
  • FIG. 4 (d) is a diagram showing the joined body 10 after the joining force enhancing step S116.
  • FIG. 5 is a view for explaining the manufacturing method of the molding die according to the first embodiment.
  • Fig. 5 (a) is a diagram showing the joined body 10 and the molding die preform 40 in the molding die pre-forming step S120
  • Fig. 5 (b) is a molding die pre-forming after the quenching step S130.
  • FIG. 5 (c) is a view showing the molding die pre-forming body 40 after the metal structure heat treatment step S140
  • FIG. 5 (d) is a drawing die forming step S 150.
  • FIG. 3 is a view showing a preform 40 and a molding die 50.
  • a method for producing a molding die according to Embodiment 1 includes a molding die for producing a molding die using a joined body in which a plurality of steel members made of a steel material containing Cr are joined together.
  • the joined body preparation step S110, the molding die pre-forming step S120, the quenching step S130, the metallographic heat-resistant plating step S 140, and the molding die formation, as shown in FIG. Step S150 is included in this order.
  • the joined body preparing step S110 includes a joined body forming step S112, a metal structure homogenizing step S114, and a joining force enhancing step S116 in this order.
  • the joined body forming step S112 abuts the planned joining surfaces 22 and 24 of the two steel members 12 and 14, and the two steel members 12 and 14 are set in a predetermined manner.
  • the first temperature T for example, 850 ° C. to 1100 ° C. (1070 ° C. in FIG. 2)
  • the first temperature T can be used to join the two steel members 12 and 14 while pressing under pressure conditions.
  • the pressing is performed by hydraulic pressure, for example, by the pressure of lOMPa.
  • the heating is performed in a vacuum furnace, and the holding time at the first temperature T is t (30 minutes in FIG. 2). Assembly formation process S 112
  • the joined body 10 is gradually cooled to room temperature.
  • the bonded body 10 is subjected to a fourth temperature T (for example, 1000 ° C to 1200 ° C ( Figure 2
  • the heating is performed in a vacuum furnace and the fourth temperature T is reached.
  • the retention time in 4 is t (1 hour in Fig. 2).
  • the joined body 10 is rapidly cooled to the Ms point, and then the joined body 10 is gradually cooled.
  • the joining force strengthening process S1 16 is performed by
  • the heating is performed in a vacuum furnace at the second temperature T.
  • the retention time is 2 (2 hours in Fig. 2).
  • the bonded body 10 is cooled in an inert gas atmosphere (for example, in an N gas atmosphere).
  • Molding mold pre-forming step SI 20 is a step of forming the molding die pre-formed body 40 by roughing the joined body 10 as shown in FIG. 5 (a).
  • the bonding of the bonded body 10 is performed by, for example, NC cutting.
  • the molding die preform 40 can be quenched at a fifth temperature T (for example, 1000 ° C. to 1200 ° C. (1050 ° C. in FIG. 3). ).) Heated to
  • the heating is performed in a vacuum furnace at the fifth temperature T.
  • the mold preform 40 is rapidly cooled to the Ms point, and then the mold preform 40 is gradually cooled.
  • the metal-structure heat-resisting step S 140 is performed at a predetermined temperature T (for example, 600 ° C. to 850 ° C. (690 ° C. in FIG. 3)). )
  • heating is performed in a vacuum furnace to a predetermined temperature T.
  • the holding time at 6 is t (2 hours in Fig. 3).
  • Metal structure heat resistance process S 140 is t (2 hours in Fig. 3).
  • Cool body 40
  • the molding die forming step S 150 is a step of forming the molding die 50 by finishing the molding die preform 40 as shown in FIG. 5 (d).
  • the finishing process of the molding die preform 40 is performed by NC cutting and polishing, for example.
  • the metal assembly that can withstand the molding temperature of the metal structure of the joined body 10 by performing the metal structure heat resistance step S140.
  • the metal structure of the molding die 50 hardly changes even under the influence of heat during molding.
  • the joint surface 26 due to this internal stress (see Fig. 4 (c) and Fig. 4 (d)). This makes it possible to suppress the breakage of the molding die 50 and to increase the durability of the molding die 50 as compared with the prior art.
  • the toughness is increased in the process of performing the metal structure heat resistance step S140, so that the impact resistance can be increased. This also makes it possible to make the molding die 50 more durable than before.
  • the Cr-containing passive layer and Z or voids present on the joint surface 26 are dissipated by performing the joining force strengthening step S116.
  • the joining force strengthening step S116 it is possible to prepare the joined body 10 joined with a sufficiently high joining force.
  • the molding die manufacturing method according to Embodiment 1 can manufacture the molding die 50 using the joined body 10 joined with a sufficiently high joining force. It is possible to further increase the durability of the.
  • the joined body forming step S112 and the metal structure homogenization step S114 between the bonding strength strengthening step S116 it becomes possible to make the metal structure in a non-uniform state through the joint formation step S112 more uniform. Furthermore, it is possible to form a bonded body 10 with high homogeneity.
  • the joined body forming step S112, the metallographic structure homogenizing step S114, and the joining force enhancing step S116 are performed in a vacuum. It is possible to suppress adverse effects caused by the presence of an active gas such as oxygen in the body formation step S112, the metal structure homogenization step S114, and the bonding strength strengthening step S116.
  • the joined body 10 is cooled in an inert gas atmosphere after the joining force strengthening step S116 is performed. It is possible to suppress the quality of the body 10 from being oxidized and deteriorating in quality.
  • the joined body 10 is gradually cooled after the joined body forming step S112 is performed. It becomes possible to form a bonded body 10 with high homogeneity while suppressing the occurrence of distortion.
  • the joining force strengthening step S116 is performed under the condition that it takes 5 hours or more to cool the joined body 10 to the A transformation point T force of 600 ° C. In 600
  • the joined body 10 is rapidly cooled to the Ms point, and then the joined body 10 is gradually cooled. Therefore, by increasing the hardness of the joined body 10 due to the quenching effect, it is possible to form the joined body 10 having high strength and high quality.
  • the planned joining surfaces 22 and 24 of the steel members 12 and 14 are flat surfaces, so that it is easy to process the scheduled joining surfaces with high accuracy. It becomes. As a result, it is possible to increase the adhesion between the steel members 12 and 14 when the steel members 12 and 14 are abutted to obtain a sufficiently high joining force.
  • the surfaces 22 and 24 are to be joined. Because the arithmetic average roughness Ra is 0.1 m, the steel members 12 and 14 should be joined with the average spacing between the surfaces 22 and 24 of the steel members 12 and 14 set to 0.2 m. Thus, a sufficiently high joining force can be obtained.
  • the heat exchange medium flow path forming grooves 32, 34 are formed on the planned joining surfaces 22, 24 of the steel members 12, 14. Therefore, it is possible to manufacture the molding die 50 in which the heat exchange medium flow path 30 is formed.
  • the molding die preliminary forming step S120 is performed between the joined body preparing step S110 and the quenching step S130. Therefore, it is possible to perform the process of the joined body 10 with good workability before the joined body 10 has a high hardness.
  • the molding die forming step S150 is performed after the metal structure heat-resisting step S140, the dimensional accuracy is high and the surface condition is high. Therefore, it is possible to manufacture a molding die 50 with good quality.
  • the test was performed on the molding dies obtained by the methods of Examples 1 to 3 and Comparative Example 1 by measuring the hardness of the molding dies and the life of the molding dies.
  • a molding die was basically manufactured according to the molding die manufacturing method according to Embodiment 1. However, in Example 1, the metal structure heat resistance process S140 is performed at 600 ° C, and in Example 2, the metal structure heat resistance process S140 is performed at 690 ° C. The metal structure heat resistance process S 140 is performed at 850 ° C. On the other hand, in Comparative Example 1, a conventional tempering process (550 ° C.) is performed instead of performing the metal structure heat treatment step S 140!
  • the bonded body forming step S112 is performed at 1070 ° C
  • the metal structure homogenizing step S114 is performed at 1040 ° C
  • the bonding strength enhancing step S116 is performed at a temperature of 850 ° C
  • the quenching step S130 The 1 050. Went in C.
  • the hardness of the molding die was measured using a Rockwell hardness C scale.
  • the life of the molding die is actually aluminum die casting using the obtained molding die. Was measured. The life of the molding die was defined as the number of moldings until the joint surface in the molding die was destroyed.
  • Table 1 is a table showing test results for Examples 1 to 3 and Comparative Example 1.
  • the life of the molding die “2500 or more” indicates that the joint surface of the molding die was not broken after 2500 moldings.
  • the molding dies according to Examples 1 to 3 are longer than the molding dies according to Comparative Example 1 (0 times) and have a lifetime (300 times to 2500 times or more). ).
  • the molding die 50 manufactured using the molding die manufacturing method according to Embodiment 1 is a molding die having higher durability than conventional ones. Therefore, a molded product (for example, an aluminum product) manufactured using the molding die 50 is a molded product with high quality and low manufacturing cost.
  • FIG. 6 is a flow chart for explaining a method for manufacturing a molding die according to the second embodiment. It is In the description of the second embodiment, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description and illustration are omitted.
  • the method for manufacturing a molding die according to the second embodiment is a method for manufacturing a molding die having steps similar to those of the molding die according to the first embodiment.
  • the step of forming the mold 50 is different from the molding die manufacturing method according to the first embodiment. That is, as shown in FIG. 6, in the manufacturing method of the molding die according to the second embodiment, the preform 10 is not subjected to the preliminary molding process, and the joined body 10 is machined after the metal structure heat-resistance process S230.
  • the molding die forming step S240 for forming the molding die 50 is performed.
  • the step of machining the joined body 10 to form the molding die 50 is the same as the method for manufacturing the molding die according to the first embodiment.
  • the metal structure heat resistance process is performed to change the metal structure of the joined body 10 into a metal structure that can withstand the molding temperature in advance. Therefore, the metal structure of the joined body 10 hardly changes even under the influence of heat during forming. As a result, even if internal stress is generated due to a large pressure or large temperature difference in the heat cycle during molding, it is possible to suppress the fracture of the joint surface 26 due to this internal stress. Higher than that.
  • the molding die forming step S240 is performed after the metal structure heat-resisting step S230, so that molding is performed by one machining.
  • the mold 50 can be manufactured.
  • the bonded structure 10 is machined after the heat treatment step S230 of the metal structure with changes in the metal structure, it is possible to manufacture a molding die 50 with high dimensional accuracy and good surface condition. It becomes.
  • the method for manufacturing the molding die according to the second embodiment is the same as that of the embodiment except that the step of forming the molding die 50 from the joined body 10 is different from the method for manufacturing the molding die according to the first embodiment. Since this method is the same as the manufacturing method of the molding die according to 1, it has the corresponding effect as it is among the effects of the manufacturing method of the molding die according to Embodiment 1.
  • FIG. 7 is a flowchart for explaining the method for manufacturing a molding die according to the third embodiment. It is In the description of the third embodiment, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description and illustration are omitted.
  • the method for manufacturing a molding die according to the third embodiment is a method for manufacturing a molding die having steps similar to those of the molding die according to the first embodiment.
  • the step of forming the mold 50 is different from the molding die manufacturing method according to the first embodiment. That is, as shown in FIG. 7, in the method for manufacturing a molding die according to Embodiment 3, the molding die preliminary forming step is not performed, and the joined body preparing step S310 and the quenching step S330 are joined.
  • the forming mold forming process S320 which forms the mold 50 by machining the body 10! /
  • the method for manufacturing the molding die according to the third embodiment is the same as the method for manufacturing the molding die according to the first embodiment in which the step of machining the joined body 10 into the molding die 50 is performed.
  • the metal structure heat resistance process is performed to change the metal structure of the joined body 10 into a metal structure that can withstand the molding temperature in advance.
  • the metal structure of the joined body 10 hardly changes even under the influence of heat during molding.
  • even if internal stress is generated by a large pressure or large temperature difference cooling cycle during molding it is possible to suppress the fracture of the joint surface 26 due to this internal stress, and the durability of the molding die 50 is improved. It becomes possible to make it higher.
  • the molding die forming step S320 is performed between the joined body preparing step S310 and the quenching step S330.
  • the molding die 50 can be formed by machining.
  • the joined body 10 is machined in a state where the workability before the joined body 10 becomes hard is good. It becomes possible.
  • the manufacturing method of the molding die according to the third embodiment is the same as that of the embodiment except that the step of forming the molding die 50 from the joined body 10 is different from the manufacturing method of the molding die according to the first embodiment. Since this method is the same as the manufacturing method of the molding die according to 1, it has the corresponding effect as it is among the effects of the manufacturing method of the molding die according to Embodiment 1.
  • FIG. 8 is a flowchart for explaining a method for manufacturing a molding die according to the fourth embodiment. It is In the description of the fourth embodiment, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description and illustration are omitted.
  • the method for manufacturing a molding die according to the fourth embodiment is a method for manufacturing a molding die having steps similar to those of the molding die according to the first embodiment, but further includes a surface treatment step S460. It differs from the manufacturing method of the shaping die concerning Embodiment 1 by the point included. That is, in the method for manufacturing a molding die according to Embodiment 4, as shown in FIG. 8, after the molding die forming step S450 is performed, the surface that increases the surface hardness of the joined body 10 at a temperature equal to or lower than a predetermined temperature T. Processing
  • the S460 will be implemented.
  • the manufacturing method of the molding die according to Embodiment 4 is different from the manufacturing method of the molding die according to Embodiment 1 in that it further includes the surface treatment step S460.
  • the effect of heat at the time of molding is achieved by performing a metal structure heat resistance process and changing the metal structure of the joined body 10 to a metal structure that can withstand the molding temperature in advance. Even if it receives, the metal structure of the joined body 10 hardly changes. As a result, even if internal stress occurs due to a large pressure or large temperature difference in the heat cycle during molding, it is possible to suppress the fracture of the joint surface 26 due to this internal stress. Can be made higher than before.
  • the method for manufacturing the molding die according to Embodiment 4 is the same as the method for manufacturing the molding die according to Embodiment 1 except that it further includes a surface treatment step S460. Of the effects possessed by the method for producing a molding die according to No. 1, the corresponding effects remain as they are.
  • the manufacturing method and the molded product of the molding die of the present invention have been described based on the above embodiments, the present invention is not limited to the above embodiments and does not depart from the gist thereof.
  • the present invention can be implemented in various modes within the scope, and for example, the following modifications are possible.
  • the force for performing the joined body forming steps S 112 to S 412 by external heating using a vacuum furnace is not limited to this.
  • external heating using a heating furnace other than a vacuum furnace electric heating (including pulse electric heating), or magnetic heating can be used.
  • the present invention is not limited to this. There is no. For example, it can also be performed by pressing a plurality of steel members using a servo motor or air pressure.
  • the A transformation point T force is gradually cooled under the condition that it takes 5 hours or more to lower the temperature to 600 ° C.
  • the force using steel for hot die (SKD61) as the steel material is not limited to this.
  • hot mold steel other than SKD61 cold mold steel, high-speed tool steel, or martensitic stainless steel can be used. Even with steel members having such steel material strength, the durability of the molding die can be made higher than before.
  • Molding molds include metal molds other than aluminum die casting molds, glass molding molds, rubber molding molds, and resin molding molds. Can be applied.
  • the method for producing a molding die of the present invention has a particularly excellent effect when the molding die is a molding die for metal molding that is exposed to a high temperature during molding.
  • the metal mold for metal forming include forged molds or forged molds for producing metal products such as aluminum products, zinc products, magnesium products, and brass products.
  • the forging mold can be suitably applied to a die casting mold, a low pressure forging mold, a gravity forging mold, and other forging molds.
  • the metal mold has a particularly excellent effect when it is a mold for die casting in which a large pressure is applied during molding.
  • the die casting mold include aluminum die casting molds, zinc die casting molds, magnesium die casting molds, and brass die casting molds.
  • the molded product is an aluminum product, but the present invention is not limited to this.
  • the molded product include various products such as zinc, magnesium, and brass in addition to aluminum products.
  • the present invention has been described by taking a method for producing a molding die as an example, but the present invention is not limited to this.
  • the present invention also includes a method for manufacturing a steel product, in which a steel product is manufactured by using a joined body in which a plurality of steel members that are Cr-containing steel materials are joined together.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention concerne un procédé pour la fabrication de moules par l'utilisation d'un corps conjugué constitué d'éléments d'acier contenant du Cr joints les uns aux autres, ledit procédé comprenant, dans cet ordre, l'étape de préparation d'un corps conjugué (S110), consistant à préparer un corps conjugué constitué par des éléments en acier contenant du Cr joints les uns aux autres, l'étape de trempe (S130), consistant à tremper le corps conjugué, et l'étape de formation d'une structure métallique résistante à la chaleur (S140), consistant à chauffer le corps conjugué à une température prescrite pour convertir de façon préalable la structure métallique du corps en une structure métallique capable de résister à la température de moulage. Le procédé permet de fabriquer des moules ayant une endurance améliorée.
PCT/JP2006/313617 2006-07-07 2006-07-07 Procédé de fabrication de moules et procédés de fabrication d'articles moulés et de produits en acier WO2008004311A1 (fr)

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PCT/JP2006/313617 WO2008004311A1 (fr) 2006-07-07 2006-07-07 Procédé de fabrication de moules et procédés de fabrication d'articles moulés et de produits en acier
JP2008523588A JP5149797B2 (ja) 2006-07-07 2006-07-07 成形金型の製造方法及び鉄鋼製品の製造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012165414A1 (fr) 2011-05-31 2012-12-06 株式会社 旭 Dispositif de moulage et procédé de fabrication d'un produit moulé

Citations (7)

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Publication number Priority date Publication date Assignee Title
JPH02292005A (ja) * 1989-05-01 1990-12-03 Mitsubishi Heavy Ind Ltd 金型の製作方法
JPH08257767A (ja) * 1995-03-24 1996-10-08 Shimadzu Corp 誘導加熱接合方法および装置
JPH11151581A (ja) * 1997-11-19 1999-06-08 Denso Corp 鉄鋼材料の接合方法及び金型の製造方法
JP2003062671A (ja) * 2001-08-24 2003-03-05 Suwa Netsukogyo Kk マニホールドの製造方法
JP2003103324A (ja) * 2001-09-26 2003-04-08 Suwa Netsukogyo Kk 金型の製造方法
JP2005163816A (ja) * 2003-11-28 2005-06-23 Kayaba Ind Co Ltd ソレノイドバルブ、及びその取付固定方法、並びにソレノイドバルブ、センサ、ポテンショメータ、流量センサその他の付属部品を取付固定するための部品取付固定具
JP2005262244A (ja) * 2004-03-17 2005-09-29 Suwa Netsukogyo Kk パルス通電による金属部材の接合方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02292005A (ja) * 1989-05-01 1990-12-03 Mitsubishi Heavy Ind Ltd 金型の製作方法
JPH08257767A (ja) * 1995-03-24 1996-10-08 Shimadzu Corp 誘導加熱接合方法および装置
JPH11151581A (ja) * 1997-11-19 1999-06-08 Denso Corp 鉄鋼材料の接合方法及び金型の製造方法
JP2003062671A (ja) * 2001-08-24 2003-03-05 Suwa Netsukogyo Kk マニホールドの製造方法
JP2003103324A (ja) * 2001-09-26 2003-04-08 Suwa Netsukogyo Kk 金型の製造方法
JP2005163816A (ja) * 2003-11-28 2005-06-23 Kayaba Ind Co Ltd ソレノイドバルブ、及びその取付固定方法、並びにソレノイドバルブ、センサ、ポテンショメータ、流量センサその他の付属部品を取付固定するための部品取付固定具
JP2005262244A (ja) * 2004-03-17 2005-09-29 Suwa Netsukogyo Kk パルス通電による金属部材の接合方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012165414A1 (fr) 2011-05-31 2012-12-06 株式会社 旭 Dispositif de moulage et procédé de fabrication d'un produit moulé

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