WO2021200951A1 - 熱間プレスライン及び熱間プレス成形品の製造方法 - Google Patents
熱間プレスライン及び熱間プレス成形品の製造方法 Download PDFInfo
- Publication number
- WO2021200951A1 WO2021200951A1 PCT/JP2021/013549 JP2021013549W WO2021200951A1 WO 2021200951 A1 WO2021200951 A1 WO 2021200951A1 JP 2021013549 W JP2021013549 W JP 2021013549W WO 2021200951 A1 WO2021200951 A1 WO 2021200951A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mold
- bottom dead
- metal plate
- dead center
- contact
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 36
- 238000000034 method Methods 0.000 title claims description 14
- 239000002184 metal Substances 0.000 claims abstract description 266
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000012546 transfer Methods 0.000 claims description 31
- 238000003825 pressing Methods 0.000 claims description 25
- 238000000465 moulding Methods 0.000 claims description 15
- 238000005452 bending Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 239000000047 product Substances 0.000 description 62
- 238000001816 cooling Methods 0.000 description 46
- 238000009826 distribution Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000032258 transport Effects 0.000 description 8
- 239000002826 coolant Substances 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 6
- 230000003028 elevating effect Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/005—Multi-stage presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/05—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work specially adapted for multi-stage presses
-
- 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
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
Definitions
- the present invention relates to a hot press line and a method for manufacturing a hot press molded product.
- characteristics such as strength may be changed locally. For example, when a high-strength member is applied to a vehicle skeleton member, the strength of a specific part may be reduced instead of increasing the strength of all parts of the member. There are several reasons for this. For example, processing such as drilling may be performed in a low-strength portion. Further, in another case, when the member is deformed, the low-strength portion may be deformed at an early stage to control the deformation behavior.
- One of the methods for manufacturing a member having a low-strength part is a method of hot stamping a tailored blank (Tailor-Welded Blank) obtained by welding steel materials having different characteristics.
- a tailored blank Teilor-Welded Blank
- Japanese Patent No. 5864414 describes a method of hot press forming a steel sheet blank composed of separate plates welded together.
- a heated steel sheet blank is hot press formed in a cooled tool pair and the formed product is cured while the blank is still in the tool pair.
- the weld between the two plates is cooled at a reduced cooling rate in relation to both sides of the weld.
- a portion having a low martensite content is formed along the welded portion.
- the cooling rate is reduced by maintaining a gap between the tool pair and the final product.
- Japanese Patent Application Laid-Open No. 2015-226936 discloses a manufacturing method that enables local adjustment of the structure of a metal structure component.
- the steel member is hot formed and hardened by contact with the tool surface over at least several sections. At least one of the two sections of the tool surface has a surface coating that reduces or increases thermal conductivity.
- the sections of the tool surface that have different thermal conductivity cause different cooling rates. Subregions of steel members with different cooling rates will have different microstructures after curing.
- the cooling rate of the metal plate can be partially reduced by the gap (clearance) between the molded product and the mold or the distribution of the thermal conductivity on the surface of the mold.
- the temperature of the portion where the cooling rate is slow is high. After that, the portion may be thermally shrunk with cooling, which may cause a shape defect in the molded product.
- the temperature difference in the molded product is large when the molded product is taken out from the mold, the molded product may be deformed due to heat shrinkage, resulting in a shape defect.
- the molded product In order to reduce the temperature of the molded product when it is taken out from the mold and the temperature difference in the molded product, the molded product must be held in the mold until the temperature in the molded product becomes uniform. On the other hand, from the viewpoint of manufacturing cost and the like, it is preferable that the holding time (bottom dead center holding time) of the molded product by the mold is short. That is, it is difficult to achieve both productivity and shape accuracy by the conventional method.
- the present disclosure describes a hot press line in which the shape accuracy of a molded product having a characteristic distribution can be ensured without lengthening the bottom dead center holding time of the molded product by a die in a hot press.
- a method for manufacturing a hot press molded product is provided.
- the hot press line has a heating device for heating a metal plate and a pair of first dies that can move relative to each other in the pressing direction, and brings the pair of first dies closer to the pressing direction.
- a heating device for heating a metal plate and a pair of first dies that can move relative to each other in the pressing direction, and brings the pair of first dies closer to the pressing direction.
- it has a first press device that press-molds the heated metal plate and holds it at the bottom dead point, and a pair of second dies that can move relative to the press direction, and press-molds with the first press device.
- a second press device for holding the metal plate at the bottom dead point of the second die, a first transfer device for transporting the metal plate from the heating device to the first press device, and the first transfer device.
- a second transport device for transporting the metal plate from the press device to the second press device is provided.
- At least one of the first mold and the second mold has an inwardly recessed clearance portion that forms a clearance with the metal plate at the bottom dead point, and the other mold has an inwardly recessed clearance portion. At least a part of the portion corresponding to the clearance portion of the one mold has a contact surface that abuts on the metal plate at the bottom dead point.
- the shape accuracy of a molded product with a characteristic distribution can be ensured without lengthening the bottom dead center holding time of the molded product by the die.
- FIG. 1 is a diagram showing a configuration example of a hot press line according to the present embodiment.
- FIG. 2 is a cross-sectional view showing a configuration example of the first press device according to the present embodiment.
- FIG. 3 is a diagram showing a state at the bottom dead center of the first press device shown in FIG.
- FIG. 4 is a cross-sectional view showing a configuration example of the second press device according to the present embodiment.
- FIG. 5 is a diagram showing a state at the bottom dead center of the second press device shown in FIG.
- FIG. 6 is a diagram showing a modified example of the configurations of the first mold and the second mold.
- FIG. 7 is a graph showing an example in which the first bottom dead center holding period has a contact period and the second bottom dead center holding period has a non-contact period.
- FIG. 8 is a graph showing an example in which the first bottom dead center holding period has a non-contact period and the second bottom dead center holding period has a contact period.
- FIG. 9 is a diagram showing a modified example of the configurations of the first mold and the second mold.
- FIG. 10 is a diagram showing a modified example of the configurations of the first mold and the second mold.
- FIG. 11 is a diagram showing a modified example of the configurations of the first mold and the second mold.
- FIG. 12 is a diagram showing a modified example of the configurations of the first mold and the second mold.
- FIG. 13 is a diagram showing a modified example of the configurations of the first mold and the second mold.
- FIG. 14 is a diagram showing evaluation positions of shape accuracy in the molded product of this embodiment.
- FIG. 15 is a graph showing the result of hardness distribution of the molded product.
- FIG. 16 is a graph showing the result of the twist angle of the molded product.
- FIG. 17 is a graph showing the result of out-of-plane deformation of the molded product.
- the hot press line has a heating device for heating a metal plate and a pair of first dies that can move relative to each other in the pressing direction, and brings the pair of first dies closer to the pressing direction.
- a heating device for heating a metal plate and a pair of first dies that can move relative to each other in the pressing direction, and brings the pair of first dies closer to the pressing direction.
- it has a first press device that press-molds the heated metal plate and holds it at the bottom dead point, and a pair of second dies that can move relative to the press direction, and press-molds with the first press device.
- a second press device for holding the metal plate at the bottom dead point of the second die, a first transfer device for transporting the metal plate from the heating device to the first press device, and the first transfer device.
- a second transport device for transporting the metal plate from the press device to the second press device is provided.
- At least one of the first mold and the second mold has an inwardly recessed clearance portion that forms a clearance with the metal plate at the bottom dead point, and the other mold has an inwardly recessed clearance portion. At least a part of the portion corresponding to the clearance portion of the one mold has a contact surface that abuts on the metal plate at the bottom dead point.
- the cooling rate can be slowed down, that is, slow cooling can be performed. Further, the cooling rate can be increased, that is, rapid cooling can be performed during the contact period in which the mold with the bottom dead center holding time abuts on a part of the metal plate.
- the temperature distribution of the metal plate can be made uniform while the cooling conditions of the portion corresponding to the clearance portion of the molded metal plate and the portion where the mold contacts over the entire bottom dead point holding time are different. can.
- the metal plate after molding taken out from the second mold is given a characteristic distribution due to the difference in cooling conditions, and the deterioration of the shape accuracy of the molded product due to the temperature difference can be suppressed. In this way, the shape accuracy of the molded product to which the characteristic distribution is given can be ensured without lengthening the bottom dead center holding time of the molded product by the mold.
- the cooling condition when a part of the member is slowly cooled is a predetermined cooling condition based on the mold configuration. Therefore, the metal structure obtained by slow cooling and the temperature distribution state of the members taken out from the mold also depend on the mold configuration. In order to change these, it is necessary to modify or remanufacture the mold configuration.
- the cooling conditions can be easily adjusted by changing the press conditions or the transport conditions. For example, the cooling conditions can be controlled by adjusting the length of time that the first mold holds the metal plate at the bottom dead center and the time that the second mold holds the metal plate at the bottom dead center. Therefore, in the press working using the hot press line, the cooling conditions when a part of the formed metal plate is slowly cooled can be easily changed.
- the configuration of the clearance part is different between the first mold and the second mold.
- the clearance portion is provided in at least one of the first mold and the second mold.
- the shape of the pair of surfaces (molding surfaces) facing each other in the pressing direction of the pair of first dies and the shape of the pair of surfaces (molding surfaces) facing each other in the pressing direction of the pair of second dies are clearances. It may be the same except for a part.
- the bottom dead center can be held by the second mold while maintaining the shape other than the portion corresponding to the clearance portion of the metal plate formed by the first mold.
- the second die may have a shape capable of holding the bottom dead center while maintaining the shape of the metal plate press-molded by the first die.
- the first mold has the clearance portion
- the second mold has the contact surface at least a part of the portion corresponding to the clearance portion of the first mold. You may.
- the mold can be brought into contact with the metal plate and rapidly cooled when the temperature of the metal plate is relatively low during the bottom dead center holding period of the second mold. Therefore, it is easy to make the temperature distribution of the metal plate close to uniform. That is, it is easy to secure the shape accuracy of the formed metal plate as a whole. In addition, it becomes easy to adjust the cooling conditions by controlling the contact period.
- the second mold has the clearance portion
- the first mold has the contact surface on at least a part of a portion corresponding to the clearance portion of the second mold. You may have.
- the metal plate can be molded by the mold at a time when the temperature of the metal plate is relatively high and it is easy to mold during the bottom dead center holding period of the first mold. Therefore, it is easy to secure the local shape accuracy of the portion corresponding to the clearance portion of the mold of the molded metal plate.
- the clearance portion of the one mold may include a pair of clearance portions facing each other with the metal plate interposed therebetween.
- the contact surface of the other mold is a pair of contact surfaces facing each other with the metal plate sandwiched in at least a part of a portion corresponding to the pair of clearance portions of the one mold. It may be included.
- the contact surface of the other mold includes a pair of contact surfaces facing in the pressing direction, and the pair of contact surfaces presses the metal plate. It has a shape that bends in the direction. As a result, the portion corresponding to the clearance portion of one mold of the metal plate can be formed into a shape corresponding to the pair of contact surfaces of the other mold.
- one of the pair of contact surfaces of the other mold may have irregularities protruding or denting in the pressing direction.
- the other contact surface facing one contact surface may have a shape corresponding to the unevenness of one contact surface.
- the contact surface of the other mold corresponding to the clearance portion of the one mold may be flat.
- the characteristic distribution can be imparted to the flat portion of the molded metal plate.
- the contact surface that contacts the metal plate at the bottom dead point is arranged on the portion of the mold facing the clearance portion of the one mold, and the other In the portion of the mold facing the contact surface of the mold, the clearance portion recessed inward to form a clearance with the metal plate at the bottom dead point may be arranged.
- the area of the clearance portion is preferably half or less, more preferably 30% or less, and more preferably 20% or less of the area in contact with the metal plate at the bottom dead center. More preferred. If the ratio of the clearance portion is too large, the ratio of the region where the formed metal plate is restrained by the mold at the bottom dead center becomes small, and it becomes difficult to obtain high shape accuracy.
- the edge of the concave portion constituting the clearance portion may be surrounded by the pressure surface of the mold.
- the pressurized surface is the surface where the mold abuts on the metal plate at bottom dead center. That is, the clearance portion may be provided in a region surrounded by a surface in which the mold abuts on the metal plate B at the bottom dead center and pressurizes.
- the periphery of the clearance portion of the molded metal plate B is constrained by the mold. Therefore, it becomes easy to secure the shape accuracy of the molded metal plate B.
- the second transport device preferably transports the metal plate so that the time from the release of the metal plate from the first mold to the placement in the second mold is within 30 seconds. Within 15 seconds is more preferred, and within 10 seconds is even more preferred. As a result, the time from the end of holding the bottom dead center of the first mold to the start of holding the bottom dead center of the second mold can be shortened, and the temperature drop during this period can be reduced.
- the first press device and the second press device may include a cooling mechanism for cooling the first die and the second die.
- at least one of the first mold and the second mold may have a pipe or a groove for passing a cooling medium.
- the hot press line may include a control unit that controls the first press device and the second press device.
- the control unit controls, for example, the holding time of the metal plate at the bottom dead center of the first die in the first press device and the holding time of the metal plate at the bottom dead center of the second die in the second press device. can do. Thereby, the non-contact period and the contact period in the entire bottom dead center holding period can be adjusted. That is, the cooling conditions of the metal plate portion corresponding to the clearance portion can be adjusted.
- the control unit may control the first mold and the second mold so that the contact period is 20 to 90% of the entire bottom dead center holding period, for example.
- the contact period is preferably 70% or less, more preferably 50% or less of the entire bottom dead center holding period.
- the method for producing a hot press molded product according to the embodiment of the present invention includes a step of heating a metal plate, a step of arranging the heated metal plate between a pair of first dies of the first press device, and the above-mentioned step.
- the die includes a second bottom dead point holding step of holding the metal plate press-molded by the first press device at the bottom dead point.
- the surface of the metal plate has a non-contact region that does not come into contact with the bottom dead center mold. , At least a part of the non-contact area comes into contact with the bottom dead center mold in the other bottom dead center holding step.
- the non-contact region on the surface of the metal plate comes into contact with the mold at the bottom dead center.
- the cooling rate can be slowed down during the non-contact period of the bottom dead center holding period.
- the cooling rate can be increased during the contact period of the bottom dead center holding time.
- Manufacturing method 2 In the manufacturing method 1, at least a part of the non-contact region of the metal plate in the first bottom dead center holding step may come into contact with the second mold in the second bottom dead center holding step.
- the mold can be brought into contact with the metal plate and rapidly cooled during the entire bottom dead center holding period including the first bottom dead center holding step and the second bottom dead center holding step when the temperature of the metal plate is relatively low. .. Therefore, it is easy to secure the shape accuracy of the formed metal plate as a whole. In addition, it becomes easy to adjust the cooling conditions by controlling the contact period.
- Manufacturing method 3 In the manufacturing method 1 or 2, even if at least a part of the non-contact region of the metal plate in the second bottom dead center holding step comes into contact with the first mold in the first bottom dead center holding step. good. As a result, the mold can be brought into contact with the metal plate and rapidly cooled when the temperature of the metal plate is relatively high during the entire bottom dead center holding period. Therefore, it is easy to secure the local shape accuracy of the portion corresponding to the clearance portion of the molded metal plate.
- the non-contact region of the metal plate in the one bottom dead center holding step includes a pair of facing regions on both sides of the metal plate, and the non-contact region of the non-contact region. At least a portion of each of the pair of regions may come into contact with the bottom dead center mold in the other bottom dead center holding step. As a result, the robustness of the cooling conditions can be enhanced.
- Manufacturing method 5 In any of the above manufacturing methods 1 to 4, at least a part of the non-contact region of the metal plate in the one bottom dead center holding step is formed into a bottom dead center mold in the other bottom dead center holding step. Molding may be performed so as to come into contact with each other and bend in the pressing direction.
- the mold at the bottom dead center comes into contact with at least a part of the back surface region of the non-contact region of the metal plate. At least a part of the region on the back surface of the non-contact region may be in a mode in which the mold does not abut in the other bottom dead center holding step.
- FIG. 1 is a diagram showing a configuration example of a hot press line according to the present embodiment.
- the hot press line 100 includes a heating device 30, a first transfer device 41, a first press device 10, a second transfer device 42, a second press device 20, and a control unit 5.
- the heating device 30 is a device that heats an object to be heated.
- Examples of the heating device 30 include a gas heating furnace, a far-infrared heating furnace, a near-infrared heating furnace, and the like.
- the heating device 30 is not limited to the heating furnace, and may be, for example, a high-frequency induction heating device, a low-frequency induction heating device, or an energization heating device that energizes and heats an object to be heated.
- the heating device 30 may have a heating chamber.
- the heating device 30 may include a plurality of indoor rollers 31 that are rotationally driven by a drive mechanism (not shown) inside the heating chamber.
- the object to be heated (in this example, the metal plate B to be pressed) on the indoor roller 31 is conveyed.
- a transport roller 26 is arranged next to the heating device 30.
- the metal plate B heated by the heating device 30 is carried out from the heating device 30 by the transport roller 26.
- the first transfer device 41 transfers the metal plate B from the heating device 30 to the first press device 10.
- the first transfer device 41 is, for example, a manipulator.
- the first transfer device 41 operates to lift, hold, move, and place the metal plate B.
- the first transfer device 41 is not limited to the manipulator.
- the first transfer device 41 may be, for example, a forklift, a roller conveyor, or the like.
- the first press device 10 has a pair of first dies 1A and 1B that can move relative to each other in the press direction.
- the first transfer device 41 arranges the metal plate B between the pair of first dies 1A and 1B of the first press device 10.
- the first press device 10 press-molds the heated metal plate B by bringing the first dies 1A and 2A closer to the press direction, and holds the metal plate B at the bottom dead center.
- the second transfer device 42 transfers the metal plate B from the first press device 10 to the second press device 20.
- the second transfer device 42 can be composed of a manipulator, a forklift, a roller conveyor, or the like.
- the second press device 20 has a pair of second dies 2A and 2B that can move relative to each other in the press direction.
- the second transfer device 42 arranges the metal plate B press-molded by the first press device 10 between the pair of second dies 2A and 2B.
- the second press device 20 holds the metal plate B press-molded by the first press device 10 at the bottom dead center of the second dies 2A and 2B.
- At least one of the first molds 1A and 1B and the second molds 2A and 2B has a clearance portion 1Ac.
- the first molds 1A and 1B have a clearance portion.
- Clearance portions are provided on at least one of a pair of facing surfaces facing each other in the pressing direction of the pair of dies.
- the clearance portion is a recess of the mold that is recessed inward.
- One mold having a clearance portion first molds 1A and 1B in the example of FIG. 1) and the other mold (second molds 2A and 2B in the example of FIG. 1) have contact surfaces. It has 2 At.
- the contact surface 2At is at least a part of the surface of the other mold corresponding to the clearance portion of one mold.
- the contact surface 2At abuts on the metal plate at bottom dead center.
- the configurations of the clearance portions are different between the first molds 1A and 1B and the second molds 2A and 2B.
- the molding surfaces of the first molds 1A and 1B and the molding surfaces of the second molds 2A and 2B have the same configuration except for the clearance portion.
- FIG. 1 is an example in which one mold having a clearance is the first mold 1A and 1B, and the other mold is the second mold 2A and 2B.
- the second molds 2A and 2B may be one mold having a clearance portion
- the first molds 1A and 1B may be the other mold having a contact surface.
- the control unit 5 controls the hot press line 100.
- the control unit 5 may be configured to control at least one of the heating device 30, the first transfer device 41, the first press device 10, the second transfer device 42, and the second press device 20.
- the control unit 5 can be composed of one or more computers having a processor and a memory.
- the processor of the control unit 5 executes at least one of the heating device 30, the first transfer device 41, the first press device 10, the second transfer device 42, and the second press device 20. It is possible to realize a function of supplying control information to one (controlled device). As an example, the control unit 5 determines the timing and operation amount (or operation direction) of operating the controlled target device based on the input from the outside and / or the data recorded in advance in the memory, and is necessary for this movement. Determine control information. The control unit 5 outputs control information to the control target device.
- the metal plate B heated by the heating device 30 is press-molded by the first press device 10 and held in the first dies 1A and 1B at the bottom dead center.
- the surface of the metal plate B is a non-contact region where the portion corresponding to the clearance portion 1Ac of the first molds 1A and 1B does not come into contact with the mold at the bottom dead center. In the non-contact region, the metal plate B is slowly cooled. The non-contact area has different cooling conditions from the other areas.
- the metal plate B press-molded by the first press device 10 is held between the second dies 2A and 2B at the bottom dead center.
- the formed metal plate B is restrained by the second molds 2A and 2B and rapidly cooled.
- the second molds 2A and 2B also come into contact with at least a part of the non-contact area.
- the non-contact area is also rapidly cooled.
- the molded metal plate B is cooled and hardened by the entire bottom dead center holding period, which is the sum of the bottom dead center holding period by the first molds 1A and 1B and the bottom dead center holding period by the second molds 2A and 2B. Will be done.
- the first dies 1A and 1B of the first press device 10 and the second dies 2A and 2B of the second press device are configured to operate independently of each other. That is, the first press device 10 presses a pair of support portions (for example, a slide and a bolster, not shown) supporting the pair of first dies 1A and 1B, and at least one of the pair of support portions in the pressing direction. It is equipped with a moving actuator (not shown).
- the second press device 20 includes a pair of support portions that support the pair of second dies 2A and 2B, and an actuator that moves at least one of the pair of support portions, independently of the first press device 10. ..
- the form of the first press device 10 and the second press device 20 is not limited to this.
- the first molds 1A and 1B and the second molds 2A and 2B may share a support portion. That is, a common support portion (for example, a slider) that supports one first mold 1A and one second mold 2A, and a common support portion that supports the other first mold 1B and the other second mold 2B.
- a support for example, a bolster
- a common actuator that moves at least one of these supports may be provided.
- the first press device 10 and the second press device 20 share the support portion and the actuator.
- the first press device 10 and the second press device 20 can be configured by one press device that performs transfer pressing with the first dies 1A and 1B and the second dies 2A and 2B.
- FIG. 2 is a cross-sectional view showing a configuration example of the first press device 10 shown in FIG.
- FIG. 3 is a diagram showing a state of the bottom dead center of the first press device 10 shown in FIG.
- the first press device 10 includes a die 1B and a punch 1A as an example of a pair of first dies 1A and 1B.
- the die 1B can move in the pressing direction PD with respect to the punch 1A. That is, the die 1B and the punch 1A can move relative to each other. The direction of this relative movement is the pressing direction.
- the die 1B can be moved in the pressing direction with respect to the punch 1A by the elevating mechanism (actuator) 81.
- the elevating mechanism 81 may include, for example, a hydraulic cylinder, an air cylinder, an air cushion, or a cam.
- the die 1B moves with respect to the punch 1A, but the punch 1A may be configured to move with respect to the die 1B.
- both the die 1B and the punch 1A may be configured to move.
- the control unit 5 controls the die 1B and the punch 1A. In the example shown in FIGS. 2 and 3, the control unit 5 controls the relative movement of the die 1B and the punch 1A by controlling the elevating mechanism 8 of the die 1B.
- the control unit 5 can supply a control signal to the elevating mechanisms (actuators) 8 and 7 to control the drive.
- the first press device 10 arranges the metal plate B between the die 1B and the punch 1A, and presses the metal plate B from both the die 1B and the punch 1A to press-mold the metal plate B.
- the die 1B has a concave shape on the inside corresponding to the shape of the press-molded product.
- the punch 1A has a convex shape corresponding to the concave shape of the die 1B.
- the surface of the die 1B facing the punch 1A includes a pressure surface 1Bu that is in contact with the metal plate B and pressurizes.
- the surface of the die 1B facing the punch 1A has a recess, that is, a clearance portion 1Bc.
- the clearance portion 1Bc does not come into contact with the metal plate B even at bottom dead center. That is, the clearance portion 1Bc forms a clearance with the metal plate B at the bottom dead center.
- the portion of the surface of the metal plate B held at bottom dead center corresponding to the clearance portion 1Bc is a non-contact region.
- the surface of the punch 1A facing the die 1B includes a pressure surface 1Au that is in contact with the metal plate B and pressurizes.
- a clearance portion 1Ac is provided at a position facing the clearance portion 1Bc of the die 1B of the punch 1A.
- the clearance portion 1Bc of the die 1B and the clearance portion 1Ac of the punch 1A are arranged so as to face each other. Seen from the pressing direction, at least a part of the clearance portion 1Ac of the punch 1A overlaps with the clearance portion 1Bc of the die 1B.
- the surface of the metal plate B comes into contact with the pressure surface 1Bu of the die 1B and the pressure surface 1Au of the punch 1A.
- the surface of the metal plate B does not come into contact with the mold.
- the surface portion of the metal plate B corresponding to the clearance portions 1Bc and 1Ac is the non-contact region Bc.
- the clearance portions 1Bc and 1Ac are located at positions facing each other, non-contact regions Bc are generated at the portions of both sides of the metal plate B facing each other.
- the control unit 5 reaches the bottom dead center by bringing the die 1B and the punch 1A relatively close to each other in the pressing direction from the state where the heated metal plate B is arranged between the die 1B and the punch 1A which are separated from each other. To move. As a result, the metal plate B is press-molded. After that, the control unit 5 holds the die 1B and the punch 1A at the bottom dead center. As a result, during the bottom dead center holding period of the first press device 10, the portion of the molded metal plate B in contact with the die 1B and the punch 1A is rapidly cooled and hardened. The non-contact region Bc of the metal plate B in the clearance portions 1Bc and 1Ac is slowly cooled.
- each of the pair of dies 1A and 1B of the first press device 10 has a pipe 11 which is a flow path through which a cooling medium is passed.
- This pipe 11 is an example of a cooling device.
- the tube 11 is formed, for example, through the through holes of the molds 1A and 1B.
- the flow rate of the cooling medium through the pipe 11 is controlled by, for example, the valve 21.
- the flow path is not limited to the pipe 11, and may be, for example, a groove on the surface of the molds 1A and 1B.
- the molds 1A and 1B are cooled by the cooling medium flowing through the flow path. By cooling, the molds 1A and 1B are kept below the Mf point (about 300 ° C.), for example. In the drawings of the molds 1A and 1B other than FIG. 2, the cooling device is not shown.
- FIG. 4 is a cross-sectional view showing a configuration example of the second press device 20 shown in FIG.
- FIG. 5 is a diagram showing a state of the bottom dead center of the second press device 20 shown in FIG.
- the second press device 20 includes a die 2B and a punch 2A as examples of the pair of second dies 2A and 2B.
- the die 2B can move in the pressing direction PD with respect to the punch 2A.
- the die 2B is the same as the shape of the die 1B of the first press device 10 except for the clearance portion 1Bc.
- the punch 2A has the same shape as the punch 1A of the first press device 10 except for the clearance portion 1Ac.
- the configuration of the elevating mechanism (actuator) 82 for relatively moving the die 2B and the punch 2A and the control unit 5 can be the same as that of the first press device 10.
- the surface of the die 2B facing the punch 2A includes a pressurized surface that is in contact with the metal plate B and pressurizes.
- the pressure surface of the die 2B includes a contact surface 2Bt which is a portion corresponding to the clearance portion 1Bc of the first press device 10.
- the contact surface 2Bt abuts on the metal plate B at bottom dead center. That is, in the die 2B of the second press device 20, the non-contact region Bc of the metal plate B is arranged at the bottom dead center in the portion corresponding to the clearance portion 1Bc.
- the surface of the punch 2A facing the die 2B includes a pressurized surface that is in contact with the metal plate B and pressurizes.
- the pressure surface of the punch 2A includes a contact surface 2At which is a portion corresponding to the clearance portion 1Ac of the first press device 10.
- the contact surface 2At abuts on the metal plate B at bottom dead center.
- the non-contact region Bc of the metal plate B is arranged at the bottom dead center in the portion corresponding to the clearance portion 1Ac.
- the surface of the metal plate B comes into contact with the pressure surface of the die 2B and the pressure surface of the punch 2A.
- the pressurized surface also includes contact surfaces 2Bt and 2At corresponding to the clearance portions 1Bc and 1Ac.
- the die 2B and the punch 2A come into contact with the non-contact region Bc of the metal plate B that has not come into contact with the die at bottom dead center.
- the mold, that is, the die 2B and the punch 2A come into contact with both of the non-contact areas of the metal plate B on both sides facing each other.
- the control unit 5 brings the die 2B and the punch 2A relatively close to each other in the pressing direction from the state where the metal plate B formed by the first pressing device 10 is arranged between the die 2B and the punch 2A which are separated from each other. Move until bottom dead center is reached. After that, the control unit 5 holds the die 2B and the punch 2A at bottom dead center. As a result, during the bottom dead center holding period of the second press device 20, the portion of the molded metal plate B in contact with the die 2B and the punch 2A is rapidly cooled and hardened.
- each of the pair of dies 2A and 2B of the second press device 20 has a pipe 12 which is a flow path through which a cooling medium is passed.
- This pipe 12 is an example of a cooling device.
- the tube 12 is formed, for example, through the through holes of the molds 2A and 2B.
- the flow rate of the cooling medium through the pipe 12 is controlled by, for example, the valve 22.
- the flow path is not limited to the pipe 12, and may be, for example, a groove on the surface of the molds 2A and 2B.
- the molds 2A and 2B are cooled by the cooling medium flowing through the flow path. By cooling, the molds 2A and 2B are kept below the Mf point (about 300 ° C.), for example. In the drawings of the molds 2A and 2B other than FIG. 4, the cooling device is not shown.
- the bottom dead center holding period in the first press device 10 (hereinafter, referred to as the first bottom dead center holding period) and the bottom dead center holding period in the second press device 20 (hereinafter, referred to as During the total bottom dead center holding period (referred to as the second bottom dead center holding period), the metal plate B is restrained by the mold in a molded shape and cooled. In the total bottom dead center holding period, the portion corresponding to the clearance portions 1Ac and 1Bc of the metal plate B, that is, the non-contact region Bc passes through the non-contact period and the contact period.
- the portion of the non-contact region Bc of the metal plate B is partially slowly cooled, and the cooling conditions are different from those of the other portions.
- the characteristics of the non-contact region Bc portion of the metal plate B can be made different from the characteristics of the other portions.
- the portion of the non-contact region Bc of the metal plate B includes a non-contact period in which the metal plate B is slowly cooled and a contact period in which the metal plate B is rapidly cooled in the total bottom dead center holding period. The temperature drops to some extent while being restrained by the mold.
- the temperature difference between the portion of the non-contact region Bc and the portion other than the non-contact region Bc, that is, the portion that is in contact with the mold and rapidly cooled during the total bottom dead center holding period is reduced. This makes it easy to ensure shape accuracy.
- the metal plate B as a material is heated by the heating device 30.
- the metal plate B may be, for example, a flat plate or a press-molded intermediate molded product.
- the metal plate B is, for example, a steel plate.
- the heating step the metal plate B is heated to Ac 3 points or more to austenite the metal structure.
- the heated metal plate B is conveyed by the first transfer device 41 and is arranged between the die 1B and the punch 1A of the first press device 10.
- a heated metal plate B is arranged between the die 1B and the punch 1A, and at least one of the die 1B and the punch 1A is moved to the bottom dead center. As a result, the metal plate B is hot press-molded. The formed metal plate B is held between the bottom dead center die 1B and the punch 1A. During this first bottom dead center holding period, the metal plate B in contact with the die 1B and the punch 1A is rapidly cooled.
- a part of the mold of the first press device 10 is provided with a clearance portion 1Bc of a recess of the die 1B and a clearance portion 1Ac of the recess of the punch 1A as clearance portions.
- the metal plate B does not come into contact with the clearance portions 1Ac and 1Bc.
- the cooling rate of the portion of the metal plate B corresponding to the clearance portions 1Ac and 1Bc, that is, the portion of the non-contact region Bc is slower than that of the portion in contact with the die 1B and the punch 1A.
- a part of the metal plate B can be slowly cooled.
- the formed metal plate B is arranged between the die 2B and the punch 2A of the second press device 20 by the second transfer device 42.
- the second press device 20 moves at least one of the die 2B and the punch 2A to the bottom dead center.
- the formed metal plate B is held between the bottom dead center die 2B and the punch 2A.
- the die 2B and the punch 2A do not have a clearance portion. Therefore, both sides of the metal plate B come into contact with the mold.
- the metal plate B in contact with the die 2B and the punch 2A is rapidly cooled.
- the molded metal plate B (molded product) is taken out from the mold (die 2B and punch 2A).
- the obtained molded product has a strength distribution and is excellent in shape accuracy.
- Cooling mode of the portion of the metal plate B hot-pressed by the first press device 10 corresponding to the clearance portions 1Bc and 1Ac of the first mold (die 1B and punch 1A), that is, the portion of the non-contact region Bc. Is (1) heat conduction in the metal plate B, (2) heat transfer between the metal plate B and the atmosphere, and (3) radiation between the metal plate B and the mold. Therefore, in the clearance portion, the cooling rate is lower than that of heat transfer between the metal plate B and the mold due to the contact of the mold.
- the cooling rate from austenite is smaller than the critical cooling rate determined by the steel sheet of the material, diffusion-type transformation occurs in the steel material, and a soft metal structure such as ferrite or bainite is generated.
- a hard metal structure mainly composed of martensite can be obtained at the site where the mold is in contact by non-diffusion type transformation. That is, by reducing the cooling rate in a part of the metal plate, a partially softened press-molded product can be manufactured.
- the second die (die 2B and punch 2A) comes into contact with the non-contact region Bc of the metal plate B during the second bottom dead center holding period of the second press device 20. Therefore, the temperature difference in the molded product at the end of the second bottom dead center holding period can be made uniform. This makes it easier to ensure the shape accuracy of the entire molded product. Further, during the contact period of the second bottom dead center holding period, the metal plate is cooled while being restrained by the mold. Therefore, it is easier to secure the shape accuracy of the portion restrained by the mold as compared with the case where the bottom dead center holding period is not restrained at all.
- a part of the mold is separated from the metal plate B as a non-contact region at the beginning of the total bottom dead center holding period, that is, during the first bottom dead center holding period, and then at the end of the total bottom dead center holding period, that is, The mold is brought into contact with the non-contact region of the metal plate B during the second bottom dead center holding period.
- FIG. 6 is a diagram showing a modified example of the configurations of the first mold and the second mold in this case.
- the first die (die 1B, punch 1A) of the first press device 10 does not have a clearance portion.
- the second die (die 2B, punch 2A) of the second press device 20 has a clearance portion 2Bc and 2Ac.
- the non-contact region Bc where the surface of the metal plate B does not contact the die is the contact surface 1At of the die at the bottom dead center of the first press device 10. It comes into contact with 1 Bt. That is, of the total bottom dead center holding period, in the first bottom dead center holding period, the non-contact region Bc of the metal plate B abuts on the mold and is rapidly cooled, and in the second bottom dead center holding period, the metal The non-contact area Bc of the plate B is slowly cooled without contacting the mold. In this case as well, the characteristics of the non-contact region Bc portion of the molded metal plate B can be made different from those of the other portions. Further, the temperature difference in the molded product at the end of the second bottom dead center holding period can be made uniform.
- FIG. 7 is a graph showing an example in which the first bottom dead center holding period has a contact period and the second bottom dead center holding period has a non-contact period.
- FIG. 7 is an example of the case where the first die and the second die shown in FIG. 6 are sequentially press-molded.
- the line L1 indicates the temperature of the portion corresponding to the clearance portion of the press-molded metal plate B.
- the line L2 indicates the temperature of the portion (other portion) of the metal plate B that is in contact with the mold throughout the bottom dead center holding period.
- the first mold having no clearance portion is in contact with the metal plate B from the start of the first bottom dead center holding period.
- the clearance CL between the mold and the metal plate B is 0 mm.
- the metal plate B is rapidly cooled.
- the metal plate B is removed from the first mold, transported, and placed between the second molds.
- the second mold holds the metal plate B at the bottom dead center after the metal plate B is press-molded to reach the bottom dead center.
- the second mold has a clearance portion. At bottom dead center, the portion of the metal plate B corresponding to the clearance portion of the second mold does not come into contact with the mold.
- the portion of the metal plate B corresponding to the clearance portion is separated from the second mold during the second bottom dead center holding period, and is separated from the second mold until the end of the second bottom dead center holding period. Therefore, the portion of the metal plate B corresponding to the clearance portion, that is, the portion of the non-contact region, does not abut on the mold after the end of the first bottom dead center holding period, that is, the contact period. After the contact period, the non-contact period is until the end of bottom dead center. In the second bottom dead center holding period, the non-contact region portion of the metal plate B has a slower cooling rate than the other portions and is slowly cooled.
- the first and second bottom dead center holding periods include a contact period in which a part of the metal plate is rapidly cooled and a non-contact period in which the metal plate is slowly cooled. Therefore, the temperature difference between the slowly cooled part and the other part of the metal plate B can be suppressed. This makes it easier to ensure the shape accuracy of the entire molded product. Further, since the slowly cooled portion is also restrained by the mold during the first bottom dead center holding period, it becomes easy to secure the shape accuracy of the slowly cooled portion.
- the non-contact region portion of the metal plate B is rapidly cooled as shown by the line L1, and the Ms point (martensite transformation start point). Before reaching, slow cooling starts away from the first mold. After that, the portion of the non-contact region of the metal plate B is slowly cooled without contacting the mold during transportation, press molding by the second mold, and holding of the second bottom dead center. This produces a soft metallographic structure.
- line L2 the portion of the metal plate B other than the non-contact region Bc abuts on the mold during both the first bottom dead center holding period and the second bottom dead center holding period, and quenching. Will be done.
- the other portion is cooled to below the Mf point (martensite transformation end point) during the second bottom dead center retention period.
- Mf point martensite transformation end point
- the portion of the metal plate B is rapidly cooled during the contact period when the temperature is relatively high during the first bottom dead center holding period. Since the metal plate B is restrained by the mold when the temperature of the metal plate B is high and soft, it becomes easier to secure the shape accuracy of the restrained portion.
- FIG. 8 is a graph showing an example in which the first bottom dead center holding period has a non-contact period and the second bottom dead center holding period has a contact period.
- FIG. 8 shows an example in which press molding is sequentially performed with the first die shown in FIG. 2 and the second die shown in FIG.
- the line L3 shows the temperature of the portion corresponding to the clearance portion of the press-molded metal plate B.
- the line L2 indicates the temperature of the portion (other portion) of the metal plate B that is in contact with the mold throughout the bottom dead center holding period.
- the first mold has a clearance portion. At the start of the first bottom dead center holding period, the clearance portion of the first mold is separated from the metal plate B.
- the portion corresponding to the clearance portion of the metal plate B that is, the portion of the non-contact region Bc is separated without abuting on the first mold.
- the molded metal plate B is removed from the first mold, transported, and placed between the second molds. In the second mold, the metal plate B is press-molded and held at bottom dead center.
- the portion of the metal plate B corresponding to the clearance portion abuts on the second mold.
- the transport period is also the non-contact period.
- the contact period is from the start of the second bottom dead center holding period to the end of the second bottom dead center.
- the first and second bottom dead center holding periods include a non-contact period in which a part of the molded metal plate B is slowly cooled and a contact period in which the molded metal plate B is rapidly cooled. Therefore, the temperature difference between the slowly cooled part and the other part of the metal plate B can be suppressed. This makes it easier to ensure the shape accuracy of the entire molded product. Further, since the slowly cooled portion is also restrained by the mold during the second bottom dead center holding period, it becomes easy to secure the shape accuracy of the slowly cooled portion.
- the non-contact region Bc portion of the metal plate B ends the contact period, that is, the second bottom dead center holding period before the temperature drops to the Ms point, as shown by the line L3. ..
- the portion of the metal plate B other than the non-contact region Bc is rapidly cooled during the first and second bottom dead center holding periods, and the Mf point is reached at the end of the second bottom dead center holding period. It is cooled to the following.
- a hard metal structure mainly composed of martensite is generated. In this way, the characteristics (for example, strength) can be made different between the portion corresponding to the clearance portion of the molded metal plate B and the other portion.
- the portion corresponding to the clearance portion of the metal plate B is rapidly cooled during the contact period when the temperature is relatively low during the second bottom dead center holding period and the cooling rate becomes slow.
- the temperature difference due to quenching is small, it is easy to control the temperature.
- the temperature of the metal plate B drops and becomes a little hard, it is restrained and rapidly cooled, so that it is easier to secure the shape accuracy.
- the contact period and non-contact period of the bottom dead center holding period are not limited to the above example.
- the first mold or clearance portion
- the bottom dead center may be held by a third mold) that does not have.
- the length of the total bottom dead center holding period which is the sum of the first bottom dead center holding period and the second bottom dead center holding period, is not limited to this, but can be, for example, 2 to 90 seconds. From the viewpoint of making the temperature distribution of the molded product uniform at the end of holding the bottom dead center, the total bottom dead center holding period should be long, but from the viewpoint of manufacturing efficiency, it should be short. Therefore, the lower limit of the total bottom dead center retention period is preferably 10 seconds, more preferably 15 seconds.
- the upper limit of the total bottom dead center retention period is preferably 90 seconds, more preferably 30 seconds.
- the total bottom dead center holding period includes the contact period and the non-contact period. Therefore, for example, even if the total bottom dead center holding period is set to 30 seconds or less, molding at the end of all bottom dead center holding is completed. It becomes easy to make the temperature distribution of the product uniform.
- the portion of B other than the non-contact region Bc is cooled to the Mf point or less during the total bottom dead center holding period. This allows quenching.
- the dies 1A and 1B of the first press device 10 and the dies 2A and 2B of the second press device 20 can all be maintained at a temperature equal to or lower than the Mf point by the cooling device.
- the clearance CL of the clearance portions 1Ac and 1Bc of the first mold 1A and 1B or the clearance portions 2Ac and 2Bc of the second mold 2A and 2B, that is, the distance between the mold and the metal plate is not particularly limited, but for example, It can be 2 mm or more, preferably 4 mm or more, and more preferably 6 mm or more.
- FIG. 9 is a diagram showing a modified example of the configurations of the first mold and the second mold.
- both the first mold and the second mold have a clearance portion and a contact surface.
- the contact surfaces 2Bt and 2At of the die 2B and the punch 2A of the second mold are formed. Contact at bottom dead center. Further, the contact surfaces 1Bt and 1At of the die 1B of the first mold and the punch 1A come into contact with the non-contact region Bc of the metal plate B corresponding to the clearance portions 2Ac and 2Bc of the second mold.
- At least a part of the second mold portion corresponding to the clearance portion of the first mold has a contact surface that abuts on the metal plate at the bottom dead center, and the second mold has a contact surface.
- At least a part of the portion of the first mold corresponding to the clearance portion of the mold may have a contact surface that abuts on the metal plate at the bottom dead center.
- the metal plate B comes into contact with the mold during the first bottom dead center holding period and does not come into contact with the mold during the second bottom dead center holding period, and the mold during the first bottom dead center holding period. Both parts that are non-contacting and come into contact with the mold during the second bottom dead center holding period are included.
- FIG. 10 is a diagram showing another modified example of the configuration of the first mold and the second mold.
- a clearance portion 1Bc which is a recess is provided in one of the pair of first molds 1A and 1B.
- the portion of the other mold 1A facing the clearance portion 1Bc is not provided with a clearance portion, that is, a recess, and is a part of the pressure surface 1Au that abuts on the metal plate B.
- the non-contact region Bc of the metal plate B is generated on the surface on the clearance portion 1Bc side, and there is no non-contact region Bc on the back surface (opposing surface) of the non-contact region Bc.
- the portion corresponding to the clearance portion 1Bc of the first mold 1B that is, the portion where the non-contact region Bc of the metal plate B is arranged is the second mold.
- the first mold and the second mold may be reversed. That is, a clearance portion may be provided on one side of the metal plate B of the second mold, and a contact surface may be provided on a portion corresponding to the clearance portion of the second mold in the first mold.
- FIG. 11 is a diagram showing another modified example of the configuration of the first mold and the second mold.
- a clearance portion 1Bc which is a recess is provided in one of the pair of first molds 1A and 1B.
- the portion of the other mold 1A facing the clearance portion 1Bc is not provided with a clearance portion, that is, a recess, and abuts on the metal plate B.
- the portion corresponding to the clearance portion 1Bc of the first mold 1B is a contact surface 2Bt that abuts on the metal plate B.
- the portion of the second mold 2A facing the contact surface 2Bt is a clearance portion 2Ac which is a recess.
- the portion of the first mold 1A corresponding to the clearance portion 2Ac of the second mold 2A is a contact surface 1At that abuts on the metal plate B. Even in the case of such a configuration, it is possible to obtain the effect that the shape accuracy of the molded product to which the characteristic distribution is given can be ensured.
- FIG. 12 is a diagram showing another modification of the configuration of the first mold and the second mold.
- the first molds 1A and 1B have clearance portions 1Ac and 1Bc.
- the second molds 2A and 2B a part of the first molds 1A and 1B corresponding to the clearance portions 1Ac and 1Bc is the clearance portions 2Ac and 2Bc, and the other portion is in contact with the metal plate B. ..
- a part of the portion of the metal plate B where the non-contact region Bc is arranged is a contact surface, and the other portion is a clearance portion 2Ac and 2Bc.
- both the first mold and the second mold have a clearance portion.
- the clearance portion of the first mold and the clearance portion of the second mold are provided at positions corresponding to each other, but the areas of the clearance portions are different. Thereby, for example, the cooling condition can be set according to the region of the clearance portion.
- FIG. 13 is a diagram showing another modification of the configuration of the first mold and the second mold.
- the first molds 1A and 1B have clearance portions 1Ac and 1Bc.
- the portions of the first molds 1A and 1B corresponding to the clearance portions 1Ac and 1Bc form a pair of contact surfaces 2Ap and 2Bp facing each other that abut on both sides of the metal plate B.
- the pair of contact surfaces 2Ap and 2Bp have a shape in which the metal plate B is bent in the pressing direction.
- One of the pair of contact surfaces, the contact surface 2Ap has a convex shape, and the other has a concave shape corresponding to the convex shape.
- the contact surfaces 2Ap and 2Bp of the second dies 2A and 2B have a convex or concave concave-convex shape in the pressing direction, so that the metal plate B of this portion is formed into a shape corresponding to the concave-convex shape. be able to.
- the method for manufacturing the hot press device and the hot press molded product in the present embodiment is not limited to this, but can be applied to, for example, the manufacture of structural members for vehicles.
- the structural member for a vehicle may be provided with a strength distribution and may be required to have shape accuracy.
- the embodiment can be suitably applied to such a structural member for a vehicle.
- a structural member for a vehicle which is a hot stamped product (hot stamp member) having a partially softened portion in a single component in order to achieve weight reduction, high functionality, etc. of the vehicle body, is a structural member of the present embodiment. It can be manufactured with a hot stamping machine.
- Examples of such a structural member for a vehicle include a high-strength center pillar having a soft flange, a rear side member or a bumper beam that controls a bending mode at the time of a collision by arranging a softened portion, and the like.
- a B-pillar mold having a clearance portion (hereinafter referred to as a clearance mold) and a mold without a clearance portion having no clearance portion were prepared and tested.
- the mold without clearance is the first mold, and has the same configuration as the first molds 1A and 1B shown in FIG.
- the clearance mold has the same configuration as the second molds 2A and 2B shown in FIG. 6 as the second mold.
- the first mold does not have a clearance portion.
- the second mold has a clearance portion at a portion corresponding to the flange portion of the B pillar.
- the clearance portion of the second mold includes a recess (gap) 2Bc of the die 2B and a recess 2Ac of the punch 2A facing the recess (gap) 2Bc. Since the portion of the metal plate B corresponding to the clearance portion of the second mold is not cooled by the mold at the bottom dead center, it is slowly cooled and the metal structure is softened.
- a hot stamped plate hereinafter, HS
- HS hot stamped plate
- the metal plate was heated in a furnace set at 900 ° C. for 5 minutes, molded with a first mold and / or a second mold, held at bottom dead center, released, and allowed to cool.
- the clearance conditions during holding the bottom dead center by the first mold and / or the second mold used were the three conditions (a) to (c) shown in Table 1 below.
- (a) is a condition for press molding with a mold having no clearance, and is a general HS condition in which the entire surface of the metal plate including the flange portion is in contact with the mold in the first mold.
- the metal plate was heated and then conveyed to the first mold, held at the bottom dead center for 10 seconds, and then released from the mold and allowed to cool.
- (B) is a condition for press molding with a second die having a clearance portion in the flange corresponding portion.
- the metal plate was heated and then conveyed to the second mold, held at the bottom dead center for 10 seconds, and then released from the mold and allowed to cool. The amount of clearance is constant throughout the bottom dead center retention period.
- the flange corresponding portion is released at a high temperature.
- the metal plate is transported to the first mold after heating, immediately released from the mold after reaching the bottom dead center, transported to the second mold, held at the bottom dead center for 30 seconds, and then released from the mold. It was chilled.
- FIG. 14 shows the evaluation position of the shape accuracy in the molded product of this example.
- the shape accuracy criteria were evaluated for the conditions (b) and (c) with reference to the data in (a).
- FIG. 15 is a graph showing the result of the hardness distribution of the molded product. Compared with the molded product under the condition (a), the molded products under the conditions (b) and (c) have lower hardness at the clearance portion.
- the clearance portion is a portion of a molded product corresponding to the clearance portion of the mold. From the results shown in FIG. 15, the effect of partial softening by the clearance portion of the clearance mold (1 step) and the clearance mold (2 steps) was found.
- FIG. 16 is a graph showing the result of the twist angle of the molded product.
- the twist angle of the graph of FIG. 16 is the twist evaluation cross section C1 of the molded product of (a) when the positions of the molded products (a) to (c) are aligned on the twist alignment surface W1 shown in FIG. It is a value indicating how much the twist is.
- FIG. 17 is a graph showing the result of out-of-plane deformation of the molded product.
- the amount of out-of-plane deformation shown in the graph of FIG. 17 indicates the amount of deformation of the surface (a) at the out-of-plane deformation evaluation position F1 shown in FIG. 14 with respect to the molded product.
- the out-of-plane deformation evaluation position F1 is a position in (b) and (c) that includes a portion corresponding to the clearance portion of the mold of the flange portion.
- the above-described embodiment is merely an example for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented within a range that does not deviate from the gist thereof.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Press Drives And Press Lines (AREA)
Abstract
Description
本発明の実施形態における熱間プレスラインは、金属板を加熱する加熱装置と、プレス方向に相対移動可能な一対の第1金型を有し、前記一対の第1金型をプレス方向に近づけることで前記加熱された金属板をプレス成形して下死点で保持する第1プレス装置と、プレス方向に相対移動可能な一対の第2金型を有し、前記第1プレス装置でプレス成形された前記金属板を、前記第2金型の下死点で保持する第2プレス装置と、前記加熱装置から前記第1プレス装置へ前記金属板を搬送する第1搬送装置と、前記第1プレス装置から前記第2プレス装置へ前記金属板を搬送する第2搬送装置と、を備える。前記第1金型及び前記第2金型の少なくとも一方の金型は、下死点において前記金属板との間にクリアランスを形成する内側に凹んだクリアランス部を有し、他方の金型は、前記一方の金型の前記クリアランス部に相当する部分の少なくとも一部に下死点で前記金属板に当接する当接面を有する。
上記構成1において、前記第1金型は、前記クリアランス部を有し、前記第2金型は、前記第1金型のクリアランス部に相当する部分の少なくとも一部に前記当接面を有してもよい。これにより、第2金型の下死点保持期間において金属板の温度が比較的低い時期に金型を金属板に接して急冷できる。そのため、金属板の温度分布を均一に近づけやすい。すなわち、成形された金属板の全体における形状精度を確保しやすい。また、当接期間を制御することによる冷却条件の調整がしやすくなる。
上記構成1又は2において、前記第2金型は、前記クリアランス部を有し、前記第1金型は、前記第2金型のクリアランス部に相当する部分の少なくとも一部に前記当接面を有してもよい。これにより、第1金型の下死点保持期間において金属板の温度が比較的高く成形し易い時期に金型により金属板を成形できる。そのため、成形された金属板の金型のクリアランス部に対応する部分の局所的な形状精度を確保しやすい。
上記構成1~3のいずれかにおいて、前記一方の金型の前記クリアランス部は、前記金属板を挟んで対向する一対のクリアランス部を含んでもよい。この場合、前記他方の金型の前記当接面は、前記一方の金型の前記一対のクリアランス部に相当する部分の少なくとも一部において、前記金属板を挟んで対向する一対の当接面を含んでもよい。一方の金型のクリアランス部では、下死点において、金属板の両面にクリアランスが存在し、他方の金型では、下死点において、両面が金型に当接する。これにより、冷却条件のロバスト性を高めることができる。
上記構成1~4のいずれかにおいて、前記他方の金型の前記当接面は、前記プレス方向に対向する一対の当接面を含み、前記一対の当接面は、前記金属板を前記プレス方向へ曲げる形状を有する。これにより、金属板の一方の金型のクリアランス部に相当する部分を、他方の金型の一対の当接面に応じた形状に成形できる。
上記構成1~5のいずれかにおいて、前記一方の金型の前記クリアランス部に対向する金型の部分には、下死点において前記金属板に当接する前記当接面が配置され、前記他方の金型の前記当接面に対向する金型の部分には、下死点において前記金属板との間にクリアランスを形成する内側に凹んだ前記クリアランス部が配置されてもよい。
本発明の実施形態における熱間プレス成形品の製造方法は、金属板を加熱する工程と、第1プレス装置の一対の第1金型の間に加熱した前記金属板を配置する工程と、前記一対の第1金型をプレス方向において相対的に近づけることで、前記金属板をプレス成形する工程と、前記一対の第1金型の下死点において、前記金属板を保持する第1下死点保持工程と、前記第1下死点保持工程の後に、プレス成形された前記金属板を、第2プレス装置の一対の第2金型の間に搬送し配置する工程と、前記一対の第2金型が下死点において、前記第1プレス装置でプレス成形された前記金属板を保持する第2下死点保持工程とを含む。前記第1下死点保持工程及び前記第2下死点保持工程の一方の下死点保持工程において、前記金属板の表面は、下死点の金型と接しない非当接領域を有し、当該非当接領域の少なくとも一部は、他方の下死点保持工程で下死点の金型に接触する。
上記製造方法1において、前記第1下死点保持工程の前記金属板の非当接領域の少なくとも一部が、前記第2下死点保持工程では前記第2金型に当接してもよい。これにより、第1下死点保持工程及び第2下死点保持工程を合わせた下死点保持期間の全体において、金属板の温度が比較的低い時期に金型を金属板に接して急冷できる。そのため、成形された金属板の全体における形状精度を確保しやすい。また、当接期間を制御することによる冷却条件の調整がしやすくなる。
上記製造方法1又は2において、前記第2下死点保持工程の前記金属板の非当接領域の少なくとも一部が、前記第1下死点保持工程では前記第1金型に当接してもよい。これにより、下死点保持期間の全体において、金属板の温度が比較的高い時期に金型を金属板に接して急冷できる。そのため、成形された金属板のクリアランス部に対応する部分の局所的な形状精度を確保しやすい。
上記製造方法1~2のいずれかにおいて、前記一方の下死点保持工程の前記金属板の非当接領域は、前記金属板の両面の対向する一対の領域を含み、当該非当接領域の一対の領域の各々の少なくとも一部は、他方の下死点保持工程で下死点の金型に接触してもよい。これにより、冷却条件のロバスト性を高めることができる。
上記製造方法1~4のいずれかにおいて、前記一方の下死点保持工程の前記金属板の非当接領域の少なくとも一部は、前記他方の下死点保持工程で下死点の金型に接触し、且つ前記プレス方向へ曲げる成形がなされてもよい。
上記製造方法1~5のいずれかにおいて、前記一方の下死点保持工程において、前記金属板の非当接領域の裏面の領域の少なくとも一部には、下死点の金型が当接し、前記非当接領域の裏面の領域の少なくとも一部は、前記他方の下死点保持工程において、金型が当接しない態様であってもよい。
図1は、本実施形態における熱間プレスラインの構成例を示す図である。熱間プレスライン100は、加熱装置30、第1搬送装置41、第1プレス装置10、第2搬送装置42、第2プレス装置20、及び制御部5を備える。
図2は、図1に示す第1プレス装置10の構成例を示す断面図である。図3は、図2に示す第1プレス装置10の下死点の状態を示す図である。図2及び図3に示す例では、第1プレス装置10は、一対の第1金型1A、1Bの例として、ダイ1B及びパンチ1Aを備える。ダイ1Bは、パンチ1Aに対してプレス方向PDに移動可能である。すなわち、ダイ1B及びパンチ1Aは、互いに相対移動可能である。この相対移動の方向が、プレス方向となる。
図4は、図1に示す第2プレス装置20の構成例を示す断面図である。図5は、図4に示す第2プレス装置20の下死点の状態を示す図である。図4及び図5に示す例では、第2プレス装置20は、一対の第2金型2A、2Bの例として、ダイ2B及びパンチ2Aを備える。ダイ2Bは、パンチ2Aに対してプレス方向PDに移動可能である。
ここで、熱間プレスライン100を用いた、熱間プレス成形品の製造工程の例を説明する。まず、加熱装置30で素材となる金属板Bを加熱する。なお、金属板Bは、例えば、平らな板であってもよいし、プレス成形された中間成形品であってもよい。金属板Bは、一例として、鋼板である。加熱工程では、金属板BをAc3点以上に加熱して、金属組織をオーステナイト化させる。加熱された金属板Bは、第1搬送装置41によって搬送され、第1プレス装置10のダイ1Bとパンチ1Aの間に配置される。
図9は、第1金型及び第2金型の構成の変形例を示す図である。図9に示す例では、第1金型及び第2金型のいずれもクリアランス部及び当接面を有する。第1金型であるダイ1B及びパンチ1Aのクリアランス部1Bc、1Acに対応する金属板Bの非当接領域Bcには、第2金型のダイ2B及びパンチ2Aの当接面2Bt、2Atが下死点で当接する。また、第2金型のクリアランス部2Ac、2Bcに対応する金属板Bの非当接領域Bcには、第1金型のダイ1B及びパンチ1Aの当接面1Bt、1Atが当接する。
クリアランス部を有するBピラー金型(以下、クリアランス金型)及びクリアランス部を有しないクリアランス無し金型を作成し、試験を行った。クリアランス無し金型は、第1金型であり、図6に示す第1金型1A、1Bと同様の構成とした。クリアランス金型は、第2金型として、図6に示す第2金型2A、2Bと同様の構成とした。第1金型は、クリアランス部を有さない。第2金型は、Bピラーのフランジ部に相当する部位に、クリアランス部が存在する。第2金型のクリアランス部は、ダイ2Bの凹部(ギャップ)2Bcと、これに対向するパンチ2Aの凹部2Acを含む。第2金型のクリアランス部に対応する金属板Bの部分は、下死点において、金型冷却されないため、緩冷却となり、金属組織は軟質化する。
1Ac、1Bc:クリアランス部
1At、1Bt:当接面
10:第1プレス装置
100:熱間プレスライン
2A、2B:第2金型
2Ac、2Bc:クリアランス部
2At、2Bt:当接面
20:第2プレス装置
30:加熱装置
41:第1搬送装置
42:第2搬送装置
5:制御部
B:金属板
Bc:非当接領域
Claims (12)
- 金属板を加熱する加熱装置と、
プレス方向に相対移動可能な一対の第1金型を有し、前記一対の第1金型をプレス方向に近づけることで前記加熱された金属板をプレス成形して下死点で保持する第1プレス装置と、
プレス方向に相対移動可能な一対の第2金型を有し、前記第1プレス装置でプレス成形された前記金属板を、前記第2金型の下死点で保持する第2プレス装置と、
前記加熱装置から前記第1プレス装置へ前記金属板を搬送する第1搬送装置と、
前記第1プレス装置から前記第2プレス装置へ前記金属板を搬送する第2搬送装置と、を備え、
前記第1金型及び前記第2金型の少なくとも一方の金型は、下死点において前記金属板との間にクリアランスを形成する内側に凹んだクリアランス部を有し、他方の金型は、前記一方の金型の前記クリアランス部に相当する部分の少なくとも一部に下死点で前記金属板に当接する当接面を有する、熱間プレスライン。 - 請求項1に記載の熱間プレスラインであって、
前記第1金型は、前記クリアランス部を有し、前記第2金型は、前記第1金型のクリアランス部に相当する部分の少なくとも一部に前記当接面を有する、熱間プレスライン。 - 請求項1又は2に記載の熱間プレスラインであって、
前記第2金型は、前記クリアランス部を有し、前記第1金型は、前記第2金型のクリアランス部に相当する部分の少なくとも一部に前記当接面を有する、熱間プレスライン。 - 請求項1~3のいずれか1項に記載の熱間プレスラインであって、
前記一方の金型の前記クリアランス部は、前記金属板を挟んで対向する一対のクリアランス部を含み、前記他方の金型の前記当接面は、前記一方の金型の前記一対のクリアランス部に相当する部分の少なくとも一部において、前記金属板を挟んで対向する一対の当接面を含む、熱間プレスライン。 - 請求項1~4のいずれか1項に記載の熱間プレスラインであって、
前記他方の金型の前記当接面は、前記プレス方向に対向する一対の当接面を含み、前記一対の当接面は、前記金属板を前記プレス方向へ曲げる形状を有する、熱間プレスライン。 - 請求項1~5のいずれか1項に記載の熱間プレスラインであって、
前記一方の金型の前記クリアランス部に対向する金型の部分には、下死点において前記金属板に当接する前記当接面が配置され、前記他方の金型の前記当接面に対向する金型の部分には、下死点において前記金属板との間にクリアランスを形成する内側に凹んだ前記クリアランス部が配置される、熱間プレスライン。 - 金属板を加熱する工程と、
第1プレス装置の一対の第1金型の間に加熱した前記金属板を配置する工程と、
前記一対の第1金型をプレス方向において相対的に近づけることで、前記金属板をプレス成形する工程と、
前記一対の第1金型の下死点において、前記金属板を保持する第1下死点保持工程と、
前記第1下死点保持工程の後に、プレス成形された前記金属板を、第2プレス装置の一対の第2金型の間に搬送し配置する工程と、
前記一対の第2金型が下死点において、前記第1プレス装置でプレス成形された前記金属板を保持する第2下死点保持工程とを含み、
前記第1下死点保持工程及び前記第2下死点保持工程の一方の下死点保持工程において、前記金属板の表面は、下死点の金型と接しない非当接領域を有し、当該非当接領域の少なくとも一部は、他方の下死点保持工程で下死点の金型に接触する、熱間プレス成形品の製造方法。 - 請求項7に記載の熱間プレス成形品の製造方法であって、
前記第1下死点保持工程の前記金属板の非当接領域の少なくとも一部が、前記第2下死点保持工程では前記第2金型に当接する、熱間プレス成形品の製造方法。 - 請求項7又は8に記載の熱間プレス成形品の製造方法であって、
前記第2下死点保持工程の前記金属板の非当接領域の少なくとも一部が、前記第1下死点保持工程では前記第1金型に当接する、熱間プレス成形品の製造方法。 - 請求項7~9のいずれか1項に記載の熱間プレス成形品の製造方法であって、
前記一方の下死点保持工程の前記金属板の非当接領域は、前記金属板の両面の対向する一対の領域を含み、当該非当接領域の一対の領域の各々の少なくとも一部は、他方の下死点保持工程で下死点の金型に接触する、熱間プレス成形品の製造方法。 - 請求項7~10のいずれか1項に記載の熱間プレス成形品の製造方法であって、
前記一方の下死点保持工程の前記金属板の非当接領域の少なくとも一部は、前記他方の下死点保持工程で下死点の金型に接触し、且つ前記プレス方向へ曲げる成形がなされる、熱間プレス成形品の製造方法。 - 請求項7~11のいずれか1項に記載の熱間プレス成形品の製造方法であって、
前記一方の下死点保持工程において、前記金属板の非当接領域の裏面の領域の少なくとも一部には、下死点の金型が当接し、前記非当接領域の裏面の領域の少なくとも一部は、前記他方の下死点保持工程において、金型が当接しない、熱間プレス成形品の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2022512543A JP7376831B2 (ja) | 2020-04-03 | 2021-03-30 | 熱間プレスライン及び熱間プレス成形品の製造方法 |
CN202180026888.4A CN115397578A (zh) | 2020-04-03 | 2021-03-30 | 热压生产线和热压成形品的制造方法 |
EP21781518.2A EP4129520A4 (en) | 2020-04-03 | 2021-03-30 | HOT PRESS LINE AND METHOD FOR PRODUCING A HOT PRESS MOLDED ARTICLE |
US17/916,090 US20230158560A1 (en) | 2020-04-03 | 2021-03-30 | Hot press line and method of manufacturing hot-press-formed product |
MX2022012425A MX2022012425A (es) | 2020-04-03 | 2021-03-30 | Linea de prensado en caliente y metodo de fabricacion del producto conformado por prensado en caliente. |
KR1020227033981A KR20220146624A (ko) | 2020-04-03 | 2021-03-30 | 열간 프레스 라인 및 열간 프레스 성형품의 제조 방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020-067816 | 2020-04-03 | ||
JP2020067816 | 2020-04-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021200951A1 true WO2021200951A1 (ja) | 2021-10-07 |
Family
ID=77928066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/013549 WO2021200951A1 (ja) | 2020-04-03 | 2021-03-30 | 熱間プレスライン及び熱間プレス成形品の製造方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20230158560A1 (ja) |
EP (1) | EP4129520A4 (ja) |
JP (1) | JP7376831B2 (ja) |
KR (1) | KR20220146624A (ja) |
CN (1) | CN115397578A (ja) |
MX (1) | MX2022012425A (ja) |
WO (1) | WO2021200951A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024122166A1 (ja) * | 2022-12-05 | 2024-06-13 | 住友重機械工業株式会社 | 成形システム |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5916389A (en) * | 1996-06-07 | 1999-06-29 | Ssab Hardtech Ab | Method of producing a sheet steel product such as a reinforcement element in a larger structure |
JP2007237204A (ja) * | 2006-03-07 | 2007-09-20 | Toyota Motor Corp | 高強度部品製造方法、高強度部品製造方法に用いられる熱間プレス成形型及び高強度部品製造方法における中間成形品 |
US20110094282A1 (en) * | 2009-10-23 | 2011-04-28 | Thyssenkrupp Umformtechnik Gmbh | Method and hot forming system for producing a hardened, hot formed workpiece |
JP2015226936A (ja) | 2009-09-01 | 2015-12-17 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトThyssenKrupp Steel Europe AG | 金属構造コンポーネントの製造方法および製造装置 |
JP5864414B2 (ja) | 2009-06-15 | 2016-02-17 | イェスタムプ・ハードテック・アクチエボラーグ | 鋼板ブランクを成形し、硬化する方法 |
JP6664556B1 (ja) * | 2018-10-10 | 2020-03-13 | ユニプレス株式会社 | プレス成形品の製造方法、保持具、及びプレス成形品の製造システム |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5740099B2 (ja) * | 2010-04-23 | 2015-06-24 | 東プレ株式会社 | 熱間プレス製品の製造方法 |
JP5963184B1 (ja) * | 2016-03-29 | 2016-08-03 | フレキシースクラム株式会社 | 拘束材およびそれを用いた加工装置,搬送装置 |
EP3865227A4 (en) * | 2018-10-10 | 2021-11-24 | Unipres Corporation | PRESS-MOLDED ARTICLE MANUFACTURING PROCESS, RETAINING TOOL AND PRESS-MOLDED ARTICLE MANUFACTURING SYSTEM |
-
2021
- 2021-03-30 JP JP2022512543A patent/JP7376831B2/ja active Active
- 2021-03-30 EP EP21781518.2A patent/EP4129520A4/en active Pending
- 2021-03-30 CN CN202180026888.4A patent/CN115397578A/zh active Pending
- 2021-03-30 KR KR1020227033981A patent/KR20220146624A/ko unknown
- 2021-03-30 US US17/916,090 patent/US20230158560A1/en active Pending
- 2021-03-30 MX MX2022012425A patent/MX2022012425A/es unknown
- 2021-03-30 WO PCT/JP2021/013549 patent/WO2021200951A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5916389A (en) * | 1996-06-07 | 1999-06-29 | Ssab Hardtech Ab | Method of producing a sheet steel product such as a reinforcement element in a larger structure |
JP2007237204A (ja) * | 2006-03-07 | 2007-09-20 | Toyota Motor Corp | 高強度部品製造方法、高強度部品製造方法に用いられる熱間プレス成形型及び高強度部品製造方法における中間成形品 |
JP5864414B2 (ja) | 2009-06-15 | 2016-02-17 | イェスタムプ・ハードテック・アクチエボラーグ | 鋼板ブランクを成形し、硬化する方法 |
JP2015226936A (ja) | 2009-09-01 | 2015-12-17 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトThyssenKrupp Steel Europe AG | 金属構造コンポーネントの製造方法および製造装置 |
US20110094282A1 (en) * | 2009-10-23 | 2011-04-28 | Thyssenkrupp Umformtechnik Gmbh | Method and hot forming system for producing a hardened, hot formed workpiece |
JP6664556B1 (ja) * | 2018-10-10 | 2020-03-13 | ユニプレス株式会社 | プレス成形品の製造方法、保持具、及びプレス成形品の製造システム |
Non-Patent Citations (1)
Title |
---|
See also references of EP4129520A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024122166A1 (ja) * | 2022-12-05 | 2024-06-13 | 住友重機械工業株式会社 | 成形システム |
Also Published As
Publication number | Publication date |
---|---|
EP4129520A1 (en) | 2023-02-08 |
EP4129520A4 (en) | 2023-09-20 |
CN115397578A (zh) | 2022-11-25 |
KR20220146624A (ko) | 2022-11-01 |
US20230158560A1 (en) | 2023-05-25 |
JP7376831B2 (ja) | 2023-11-09 |
JPWO2021200951A1 (ja) | 2021-10-07 |
MX2022012425A (es) | 2022-11-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20160059295A1 (en) | Method and press for producing sheet metal parts that are hardened at least in regions | |
WO2013047526A1 (ja) | プレス成形品の製造方法およびプレス成形設備 | |
WO2012011224A1 (ja) | ホットプレスによる鋼板の成形方法 | |
US20120040205A1 (en) | Method for producing a press-quenched metal component | |
RU2711705C2 (ru) | Системы и способы прессования | |
JP2016182642A (ja) | 部分的に硬化した成形品を製造する方法および装置 | |
JP7160917B2 (ja) | コーティングされた鋼に対するプレス方法及び鋼の使用法 | |
CN112118922B (zh) | 用于热成型的板材的传导预热 | |
US11534815B2 (en) | Press formed product, automobile structural member with the press formed product, and method for producing press formed product | |
WO2021200951A1 (ja) | 熱間プレスライン及び熱間プレス成形品の製造方法 | |
JP6619645B2 (ja) | ホットプレス装置、及びホットプレス成形方法 | |
JP2020507472A (ja) | ブランクを加熱するための方法と加熱システム | |
JP2010075935A (ja) | ダイクエンチ加工製品とその製造方法及び製造装置 | |
WO2021200923A1 (ja) | 熱間プレス装置及び熱間プレス成形品の製造方法 | |
US11504758B2 (en) | Hot press processing method and hot press processing apparatus | |
KR101505272B1 (ko) | 국부 연화가 가능한 핫 스탬핑 성형장치 및 성형방법 | |
CA3150898C (en) | Press systems and methods | |
JP2013094803A (ja) | プレス成形方法 | |
KR102348557B1 (ko) | 생산성 및 성형성이 우수한 다단 공정용 열간 프레스 성형 부재의 제조방법 및 방법 | |
JP7116009B2 (ja) | プレス成形方法 | |
JP7035721B2 (ja) | 熱間プレス加工方法及び加工装置 | |
JP2023180687A (ja) | 熱間プレス用ブランク材の製造方法及び熱間プレス用ブランク材 | |
JP2023123186A (ja) | プレス成形品の製造方法 | |
WRÓBEL et al. | Simulations of hot forming processes of variable thicknesses workpieces | |
KR20170053195A (ko) | 성형판재 제조방법 및, 제조장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21781518 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20227033981 Country of ref document: KR Kind code of ref document: A Ref document number: 2022512543 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202217056459 Country of ref document: IN |
|
ENP | Entry into the national phase |
Ref document number: 2021781518 Country of ref document: EP Effective date: 20220923 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |