WO2022045057A1 - プレス成形品の製造方法、加熱ワークの搬送装置、及び熱間プレス製造ライン - Google Patents

プレス成形品の製造方法、加熱ワークの搬送装置、及び熱間プレス製造ライン Download PDF

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Publication number
WO2022045057A1
WO2022045057A1 PCT/JP2021/030781 JP2021030781W WO2022045057A1 WO 2022045057 A1 WO2022045057 A1 WO 2022045057A1 JP 2021030781 W JP2021030781 W JP 2021030781W WO 2022045057 A1 WO2022045057 A1 WO 2022045057A1
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WIPO (PCT)
Prior art keywords
heating work
pair
heating
work
claws
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2021/030781
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English (en)
French (fr)
Japanese (ja)
Inventor
俊哉 鈴木
成彦 野村
幸一 ▲浜▼田
雄二郎 巽
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Nippon Steel Corp
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Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP2022544579A priority Critical patent/JP7332969B2/ja
Priority to US18/042,643 priority patent/US12576443B2/en
Priority to CN202180053242.5A priority patent/CN115989099A/zh
Priority to EP21861483.2A priority patent/EP4205874A4/en
Publication of WO2022045057A1 publication Critical patent/WO2022045057A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to 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
    • 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
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/105—Manipulators, i.e. mechanical arms carrying a gripper element having several degrees of freedom
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J15/00—Gripping heads and other end effectors
    • B25J15/0014—Gripping heads and other end effectors having fork, comb or plate shaped means for engaging the lower surface on a object to be transported
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J15/00—Gripping heads and other end effectors
    • B25J15/02—Gripping heads and other end effectors servo-actuated
    • B25J15/0206—Gripping heads and other end effectors servo-actuated comprising articulated grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J15/00—Gripping heads and other end effectors
    • B25J15/08—Gripping heads and other end effectors having finger members
    • B25J15/10—Gripping heads and other end effectors having finger members with three or more finger members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J15/00—Gripping heads and other end effectors
    • B25J15/08—Gripping heads and other end effectors having finger members
    • B25J15/10—Gripping heads and other end effectors having finger members with three or more finger members
    • B25J15/106—Gripping heads and other end effectors having finger members with three or more finger members moving in parallel relationship
    • 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
    • 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
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • 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
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/003—Simultaneous forming, e.g. making more than one part per stroke
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof
    • 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
    • C21D2251/00—Treating composite or clad material
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0025—Supports; Baskets; Containers; Covers
    • 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
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a method for manufacturing a press-molded product, a transfer device for a heated work, and a hot press manufacturing line.
  • a technique of pressing a material heated to a predetermined temperature with a press machine has been used.
  • a steel sheet for hot pressing which is a material, is heated to an austenite region (about 900 ° C. or higher) and hot pressed.
  • an austenite region about 900 ° C. or higher
  • a press-molded product having a strength of, for example, 1500 MPa class or higher can be obtained by performing a quenching process together with the molding process.
  • quenching is performed by quenching by contact heat transfer with a die during press forming.
  • the temperature of the material at the start of press molding which corresponds to the quenching start temperature, to a predetermined temperature or higher.
  • the predetermined temperature at the start of press molding is, for example, 700 ° C. or higher, although it depends on the material.
  • Japanese Patent No. 5910305 and Japanese Patent No. 5910306 include hot pressing molding including a step of heating a plurality of plate-shaped workpieces by attaching electrodes to a plurality of superposed conductive plate-shaped workpieces and energizing them. The method is disclosed. A plurality of heated plate-shaped workpieces are arranged at predetermined press positions different from the energization positions. The plurality of plate-shaped workpieces arranged at the press positions are each press-molded. Productivity can be improved by simultaneously heating a plurality of plate-shaped workpieces by energization.
  • the first work and the second work are heated without overlapping each other, carried between the upper mold and the lower mold, and above the first work.
  • the second work is placed in an overlapping position, and the upper mold is lowered and pressed.
  • the mold is lowered independently of the upper mold to plastically deform the first work and the second work.
  • the overlapping portions of the first work and the second work are engaged with each other and do not shift.
  • a carry-in device including an arm for carrying the first work and a holder for carrying the second work is disclosed.
  • Japanese Patent No. 5814669 discloses a transport device for hot press that holds and transports a panel-shaped object to be transported in a heated state between each process of a production line that performs hot press.
  • the hot press transfer device transports the heated object while covering it with a heat insulating cover. This keeps the object to be transported at the temperature required for quenching.
  • the hot press forming apparatus disclosed in Japanese Patent No. 4673656 includes a primary heating means by induction heating or energization heating and a secondary heating means by radiant heat transfer as a heating device for a metal plate to be processed.
  • a secondary heating means by radiant heat transfer is arranged in a transfer device from the primary heating means to the hot press forming die.
  • the inventors have noticed that when the material of a hot press is thinned, the temperature drop during transportation to the press after heating the material can affect the quality of the press-molded product. Therefore, we investigated a method to suppress the temperature drop of the material during transportation. In the study, it was found that it may be difficult to sufficiently suppress the temperature drop only by covering the material being transported with the heat insulating cover as in the above-mentioned conventional technique. It is also conceivable to provide a secondary heating means for heating the material during transportation. However, in this case, it is necessary to add equipment including a heat source for the secondary heating means on the transport path. This may lead to an increase in equipment cost and operation cost as well as an increase in equipment size.
  • the present application applies a method for manufacturing a press-molded product and transporting a heated work, which can easily alleviate the temperature drop of the material in the transport time from the heating of the material to the start of press molding in hot press molding. Disclose the device.
  • a heating step of simultaneously heating at least two plate-shaped workpieces by a heating device and a transporting apparatus of at least two heated workpieces heated in the heating step are conveyed. It has a transfer step of transporting to the press machine by the above, and a press step of processing at least two of the heated works conveyed to the press machine in the transfer step by the press machine.
  • the transfer step the pair of first arms rotatably attached to the base frame included in the transfer device is driven, and the claws of the pair of first arms are used to drive the first of the at least two heating workpieces.
  • the process of supporting and lifting the lower surfaces of both ends of the heating work and the pair of second arms rotatably attached to the base frame included in the transport device are driven by a system different from the pair of first arms.
  • the step of supporting and lifting the lower surfaces of both ends of the second heating work among the at least two heating works with the pair of claws of the second arm, and the claws of the pair of first arms of the transfer device.
  • the first heating work whose lower surfaces are supported at both ends and the second heating work whose lower surfaces are supported by the claws of the pair of second arms are combined with the plate surface method of the first heating work.
  • the pair of second arms is driven by a system different from that of the pair of first arms, and the second heating work supported by the pair of second arms is lowered to the press position of the press machine. Including the process.
  • the temperature drop of the material can be easily alleviated in the transport time from the heating of the material in hot press molding to the start of press molding.
  • FIG. 1 is a plan view showing an outline showing a hot pressing production line according to the present embodiment.
  • FIG. 2A is a side view showing a configuration example of the transfer device of FIG. 1 as viewed from the y direction.
  • FIG. 2B is a diagram showing a state in which the second arm 72 of the transfer device of FIG. 2A is opened to the outside.
  • FIG. 3 is a side view showing a configuration example of the transport device of FIG. 1 as viewed from the x direction.
  • FIG. 4 is a diagram for explaining an example of a control system of the first to fourth drive units.
  • FIG. 5 is a diagram showing an example of a heating process.
  • FIG. 6 is a diagram showing an example of a process in which the transfer device lifts the first heating work.
  • FIG. 5 is a diagram showing an example of a heating process.
  • FIG. 7 is a diagram showing an example of a process in which the transfer device lifts the second heating work.
  • FIG. 8 is a diagram showing an example of a process of transporting a work and arranging it at a press position.
  • FIG. 9 is a diagram showing an example in the case where the first heating work and the second heating work are intermediate molded products.
  • FIG. 10 is a diagram showing an example when the sizes of the first heating work and the second heating work are different.
  • FIG. 11 is a diagram showing an example in which the shapes of the first heating work and the second heating work are different.
  • FIG. 12 is a diagram showing an example in which the shielding plate is provided in the transport device.
  • FIG. 13 is a diagram showing another example in which the shielding plate is provided in the transport device.
  • FIG. 14 is a diagram showing a modified example of the shape of the shielding plate.
  • FIG. 15 is a diagram showing another example in which the shielding plate is provided in the transport device.
  • FIG. 16 is a diagram showing an example of a transport device for transporting a difference thickness plate.
  • FIG. 17 is a diagram showing a modified example of the first arm and the second arm.
  • FIG. 18 is a diagram showing other modifications of the first arm and the second arm.
  • FIG. 19 is a diagram showing a modified example of the support structure of the heated work by the transport device.
  • FIG. 20 is a perspective view showing the first and second heating workpieces shown in FIG.
  • FIG. 21 is a diagram showing a modified example of the support structure of the heated work by the transport device.
  • FIG. 22 is a perspective view showing the first and second heating workpieces shown in FIG. 21.
  • FIG. 23 is a diagram showing a modified example of the first and second heating workpieces shown in FIG. 21.
  • FIG. 24 is a diagram showing a modified example of the support structure of the heated work by the transport device.
  • FIG. 25 is a perspective view showing the first and second heating workpieces shown in FIG. 24.
  • FIG. 26 is a diagram showing a modified example of the first and second heating workpieces shown in FIG. 24.
  • FIG. 27 is a diagram showing a modified example of the hot pressing production line 10 shown in FIG.
  • FIG. 28 is a top view of the tray 1 shown in FIG. 27 as viewed from above.
  • FIG. 29 is a side view of the tray shown in FIG.
  • FIG. 30 is a diagram showing a modified example of the hot pressing production line 10 shown in FIG.
  • FIG. 31 is a top view of the tray 1 shown in FIG. 30 as viewed from above.
  • FIG. 32 is a side view of the tray shown in FIG. 31 as viewed from the direction of arrow F.
  • FIG. 33 shows the temperature measurement position in Experimental Example 1.
  • FIG. 34 is a graph of the average temperature drop rate as a measurement result.
  • FIG. 35 is a graph showing a range targeted for deriving the average temperature drop rate.
  • FIG. 36 is a diagram showing the configuration of the shielding plate used in Experimental Example 2.
  • FIG. 37 is a graph of the average temperature drop rate as a measurement result.
  • FIG. 38 is a graph showing a range targeted for deriving the average temperature drop rate.
  • the temperature at the start of press molding depends on the heating temperature of the material and how much the temperature drops within the time it takes to transfer the material to the press forming die.
  • the heating temperature of the material is determined by the metallurgical conditions.
  • the transport time to the mold after heating is determined by the equipment configuration and specifications.
  • the amount of temperature drop during the transfer depends on the heat capacity of the material. For example, in the case of a steel sheet, heat escapes mainly by heat transfer from the front and back surfaces to the atmosphere and heat radiation (radiation). The inventors have found that the amount of temperature drop largely depends on the plate thickness of the material.
  • the amount of temperature decrease becomes large even in the same transport time, and it may be difficult to secure the molding start temperature required for quenching. As a result, it may not be possible to obtain the component strength required for the press-molded product.
  • the inventors examined a method of suppressing the temperature drop during transportation without adding a heat source.
  • a configuration in which a plurality of plate-shaped materials (workpieces) heated at the same time are arranged in a direction perpendicular to the surface of the plate (direction perpendicular to the surface) and conveyed at the same time.
  • the heating works facing each other receive radiant heat from each other, so that the amount of heat can be supplemented to each other.
  • the inventors examined a method and an apparatus for transporting a plurality of heated plate-shaped workpieces side by side in the direction perpendicular to the plane.
  • the transport device accesses and lifts each of the plurality of works heated by the heating device from the plane-directed direction, and holds the plurality of works in an overlapping manner in the plane-directed direction. Further, in order to suppress the temperature drop, it is preferable that the distance between the plurality of workpieces being transported is short and there are many portions overlapping in the plane-to-plane direction. It was also found that the temperature drop near the ends of a plurality of workpieces being transported is easily affected by the distance between the workpieces.
  • the suction pad is not suitable for simple and efficient transportation while suppressing the temperature drop. That is, when a plurality of workpieces having many overlapping portions in the direction perpendicular to the surface are held and conveyed with a close distance between the workpieces, the suction pad can hold only the workpiece at the uppermost portion. Further, since heat is removed by the pad at the contact portion between the suction pad and the work, a temperature drop region corresponding to the contact area of the pad is generated. There is a limit to the miniaturization of the suction pad in order to hold and transport the work.
  • the inventors can stably keep the distance between the plurality of works small during transportation by using a transport device having a plurality of pairs of a pair of arms that support the lower surfaces of both ends of each of the plurality of workpieces. I came up with the composition. It has been found that this configuration can hold a plurality of workpieces under the same conditions regardless of the position of the workpieces, and can hold and transport the plurality of workpieces at appropriate positions from the viewpoint of suppressing temperature drop. Further, with this configuration, it is possible to efficiently lift and lower a plurality of workpieces. The following embodiments are based on this finding.
  • a heating step of simultaneously heating at least two plate-shaped workpieces by a heating device and a transporting apparatus of at least two heated workpieces heated in the heating step are conveyed. It has a transfer step of transporting to the press machine by the above, and a press step of processing at least two of the heated works conveyed to the press machine in the transfer step by the press machine.
  • the transfer process is A pair of first arms rotatably attached to a base frame included in the transfer device is driven, and both ends of the first heating work of the at least two heating works are driven by the claws of the pair of first arms.
  • the process of supporting and lifting the lower surface of the A pair of second arms rotatably attached to the base frame included in the transport device is driven by a system different from that of the pair of first arms, and at least two of the pair of second arms are claws.
  • the pair of second arms is driven by a system different from that of the pair of first arms, and the second heating work supported by the pair of second arms is pressed at the press position (second press) of the press machine. Including the process of lowering to the position).
  • the first press position may be a position different from the second press position.
  • the lower surfaces of both ends of the first heating work are supported by a pair of claws of the first arm, and the lower surfaces of both ends of the second heating work are supported by the pair of claws of the second arm.
  • Transport in a state the first heating work and the second heating work can be conveyed in a state where they can efficiently receive heat radiation from each other. Since both ends of the first heated work and the second heated work are supported by the first claw and the second claw, respectively, the distance between both ends of the two works can be stably maintained. That is, since the first claw and the second claw are held by supporting the first heating work and the second heating work from below, the tip thereof can have a relatively simple and thin shape.
  • the temperature drop of the work can be easily alleviated in the transport time from the heating of the material in hot press forming to the start of press forming.
  • the first heating work whose lower surfaces are supported by the claws of the pair of first arms and the lower surfaces of both ends are supported by the claws of the pair of second arms. It is preferable that the second heating work is conveyed so as to overlap each other at intervals of 50 mm or less in the normal direction of the plate surface of the first heating work. As a result, the temperature drop of the heated work during transportation is effectively suppressed. If the distance between the heating works is too wide, the other of the facing heat radiations emitted from one heating work in the direction inclined with respect to the normal of the plate surface at the ends of the first and second heating works. The proportion of heat radiation that does not reach the heated work increases.
  • the effect of alleviating the temperature drop may not be sufficiently obtained. Further, if the distance between the heating works is too wide, the air warmed by the heat transfer from both heating works is less likely to stay between the heating works, and a sufficient heat retention effect may not be obtained.
  • the first heating work in which the lower surfaces of both ends are supported by the claws of the pair of first arms and the lower surfaces of both ends are supported by the claws of the pair of second arms. It is preferable that the supported second heating work is conveyed in a state of being overlapped with each other at intervals in the normal direction of the plate surface of the first heating work.
  • the upper and lower surfaces of each of the first heating work and the second heating work come into contact with air during transportation. Therefore, the difference in the conditions of the upper surface and the lower surface in the transport becomes smaller than in the case where the first heating work and the second heating work come into contact with each other. As a result, the difference in quality between the upper surface and the lower surface of each of the first heating work and the second heating work can be suppressed.
  • the first heating work and the second heating work are supported in the support portion supported by the claws of the arm of the heating work supported on the upper side of the first heating work and the second heating work which are conveyed on top of each other.
  • the distance between the plate surfaces of the first heating work in the normal direction is preferably 3 mm or more, for example.
  • the first heating work and the second heating work have the same shape as seen from above and overlap in the normal direction of the plate surface of the first heating work, the first heating work and the second heating work
  • the claws of the pair of arms that support the heating work on the upper side are inserted between the heating work on the upper side and the heating work on the lower side.
  • the distance between the heated works is too narrow, it becomes necessary to reduce the thickness of the portion of the arm that supports the lower surface of the upper heated work. As a result, the strength to support the heated work may not be maintained. Therefore, at least in the portion supported by the claws of the heated work supported on the upper side, the distance between the first heated work and the second heated work may be set to 3 to 50 mm.
  • one of the first heating work and the second heating work which is conveyed in a state of being overlapped with the transfer device in the normal direction of the plate surface, has a thickness of one of the other. It is preferably thick and has a large area. As a result, it is possible to efficiently suppress the temperature drop of the work having a thin plate thickness.
  • the first heating work whose lower surfaces are supported by the claws of the pair of first arms and the claws of the pair of second arms are used to support both ends. It is preferable that the second heating work supported on the lower surface is transported in a state where the front surface in the transport direction is covered with the side shielding plate. Since the shielding plate can prevent air from hitting the front surface of the heated work in the transport direction from the front, it is possible to alleviate the temperature drop from the end face of the heated work on the front surface in the transport direction, and heat transfer from both heated works. It is possible to suppress the movement of the stagnant air between the two heated works warmed to the outside and maintain the heat retaining effect. Therefore, the temperature drop of the heated work during transportation is further suppressed.
  • the side shielding plate has an inclined surface that inclines toward the first heating work and the second heating work as it approaches the end portion from the central portion. As a result, the air that hits the shielding plate flows in the direction away from the first and second heating works along the inclined surface. Therefore, the effect of suppressing the temperature drop of the heated work during transportation is enhanced.
  • the first heating work whose lower surfaces are supported by the claws of the pair of first arms and the claws of the pair of second arms are used to support both ends. It is preferable that the second heating work having the lower surface supported is conveyed with the upper side covered by the upper shielding plate. Since the warmed air tends to move upward, the warmed air tends to stay below the lower heating work due to heat transfer from the lower heating work, so even if there is no shielding plate, the lower side A heat retaining effect on the lower surface of the heated work can be obtained.
  • the air warmed by the heat transfer from the upper heating work moves upward, so that the heat retaining effect is hardly obtained.
  • the shielding plate above the upper heating work, the air warmed by the heat transfer from the upper heating work can be retained between the upper heating work and the upper shielding plate.
  • the warmed stagnant air can provide a heat retaining effect on the upper surface of the upper heating work. As a result, the effect of suppressing the temperature drop of the upper heating work during transportation can be further enhanced.
  • the distance is preferably, for example, 200 mm or less, and more preferably 100 mm or less.
  • the upper shielding plate covering the upper part of the first heating work and the second heating work is arranged between the base frame and the heating work supported on the upper side of the first heating work and the second heating work. May be done. As a result, the upper shielding plate can be arranged at a position close to the upper part of the heating work. As a result, the effect of suppressing the temperature drop by the upper shielding plate can be further enhanced.
  • At least one of the first heating work and the second heating work may have a long direction and a short direction in a state of being conveyed by the transfer device.
  • the side shielding plate can cover the long direction of the first heating work and the second heating work in the transfer step.
  • the first heating work and the second heating work may be a differential thick plate including a thick portion and a thin portion.
  • the thick portions of the first heating work whose lower surfaces are supported by the claws of the pair of first arms and the lower surfaces of both ends are supported by the claws of the pair of second arms.
  • the thin-walled portions of the supported second heating work are conveyed in a state of overlapping in the normal direction of the plate surface.
  • the first heating work is placed above the plate-shaped heat storage material, and the normal of the plate surface of the first heating work.
  • the second heating work is placed above the heat storage material in a state of overlapping with the heat storage material in the direction, and is heated in a state of overlapping with the heat storage material in the normal direction of the plate surface of the second heating work.
  • the transfer step the heat storage material and the first heating work and the second heating work placed above the heat storage material are transferred from the heating device to a lifting position by the transfer device together with the heat storage material. It may include a step.
  • each of the first and second heating works is heated in a state of being vertically overlapped with the plate-shaped heat storage material by the heating device. After heating, each of the first and second heating works is conveyed from the heating device to the lifting position together with the heat storage material. Therefore, each of the first and second heating works is in a state of being vertically overlapped with the heat storage material from the heating to being lifted by the transport device. That is, each of the first and second heating works and the heat storage material are in a state of being overlapped in a direction (normal direction) perpendicular to the plate surface of each heating work.
  • the lower surface of the first heating work and the upper surface of the heat storage material face each other, and the lower surface of the second heating work and the upper surface of the heat storage material face each other.
  • the first heating work and the heat storage material, and the second heating work and the heat storage material compensate each other for the amount of heat, and are lifted by the transport device at the lifting position.
  • the first heating work and the second heating work can compensate each other for the amount of heat until they are placed in the press position. Further, the first heating work and the second heating work are placed above the heat storage material. Therefore, the lifting operation can be performed easily and quickly.
  • the temperature drop of the material can be easily alleviated in the time from the heating of the material in the hot press molding to the start of the press molding.
  • the first heating work and the second heating work may be conveyed above the heat storage material in a state where they do not overlap each other in the vertical direction.
  • the plate-shaped heat storage material is not limited to a flat plate.
  • the plate-shaped heat storage material may be a plate having a convex portion protruding in the normal direction of the plate surface, a plate having a hollow portion penetrating the plate, a curved plate, or the like.
  • the heat storage material is placed on the tray main body, and each of the first heating work and the second heating work is higher than the upper surface of the heat storage material above the tray main body or the heat storage material. It may be heated while being placed on at least three first columns extending to the position.
  • the transfer step the heat storage material placed on the tray body, the first heating work, and the second heating work are transferred from the heating device to the lifting position together with the tray body. May be good.
  • the transport device lifts the first heating work and the second heating work placed on the first support column group upward, the first support column group does not become an obstacle. Therefore, the lifting operation can be performed easily and quickly.
  • the heat storage material may have a convex portion protruding upward.
  • each of the first heating work and the second heating work may be heated while being placed on the convex portion of the heat storage material.
  • the first heating work and the second heating work may be transferred from the heating device to the lifting position in a state of being placed on the convex portion of the heat storage material.
  • the minimum plate thickness t1 (mm) of the thinnest portion of the work is preferably in the relationship of the following formula.
  • the minimum plate thickness t1 (mm) of the thinnest portion of the first heating work and the second heating work and the minimum plate thickness t2 (mm) of the thinnest portion of the heat storage material may have the following relationship. As a result, the temperature drop of the work can be effectively suppressed. 0.8 ⁇ t2 / t1 ⁇ 20
  • the first heating work is a group of at least three first columns extending upward from a tray body having a hollow portion penetrating vertically when viewed from above.
  • the second heating work is placed on, and the second heating work is placed on at least three second columns extending upward from the tray body, and above the first heating work, of the first heating work. It may be heated by the heating device in a state where it is arranged so as to be overlapped with the first heating work in the normal direction of the plate surface.
  • the first heating work is placed on the first support column group, the second heating work is placed on the second support column group, and above the first heating work.
  • It may include a step of transporting the first heating work from the heating device to a lifting position by the transport device together with the tray main body in a state of being arranged so as to be overlapped with the first heating work in the normal direction of the plate surface of the first heating work. ..
  • the first heating work and the second heating work are heated in a state of being vertically overlapped by a group of tray columns. After heating, the first heating work and the second heating work are conveyed together with the tray from the heating device to the lifting position. Therefore, the first heating work and the second heating work are in a vertically overlapped state from the time when the heating device is discharged until the time when the second heating work is lifted by the transfer device. That is, the first heating work and the second heating work are in a state of being overlapped in a direction (normal direction) perpendicular to the plate surface of the first heating work. For example, the upper surface of the first heating work and the lower surface of the second heating work face each other.
  • the first heating work and the second heating work receive radiant heat from each other until the heating is completed until the heat is lifted by the transport device, and the heat is increased by the first heating work and the second heating work until they are placed in the press position after being lifted by the transport device. You can make up for each other.
  • the first heating work is placed on the first support column group, and the second heating work placed on the second support column group is placed above the first heating work.
  • the columns are formed so as to extend upward from the tray body. Therefore, when the second heating work and the first heating work placed on the support column group are sequentially or simultaneously lifted upward by the transport device, the support column group does not become an obstacle.
  • the lifting operation can be performed easily and quickly. As a result, the temperature drop of the material can be easily alleviated in the transport time from the heating of the material in the hot press molding to the start of the press molding.
  • the maximum distance Dt in the vertical direction between the first heating work placed in the first strut group and the second heating work placed in the second strut group is preferable that (mm) and the minimum plate thickness t (mm) of the thinnest portion of the first heating work and the second heating work have the following relationship. As a result, the temperature drop of the first heating work and the second heating work during transportation is effectively suppressed. Dt ⁇ 120t From the same viewpoint, Dt ⁇ 100t is more preferable, and Dt ⁇ 60t is further preferable.
  • the distance between the first heating work placed in the first support column group and the second heating work placed in the second support column group is, for example, preferably 100 mm or less, more preferably 50 m or less.
  • the transfer device for the heated work includes a base frame that is vertically movable in the horizontal direction, a pair of first arms that are rotatably attached to the base frame, and rotation to the base frame. It includes a pair of possibly attached second arms, a first drive unit for driving the first arm, and a second drive unit for driving the second arm.
  • the pair of first arms are arranged in the lateral direction of the base frame, and the pair of first base portions extending in the vertical direction from the base frame and the first arm extending in the lateral direction from each of the pair of first base portions. Has claws.
  • the pair of second arms are arranged in the lateral direction of the base frame, and the pair of second bases extending in the vertical direction from the base frame and the second arm extending in the lateral direction from each of the pair of second bases.
  • the first drive unit changes the lateral distance of the pair of first claws by rotating the pair of the first arms with respect to the base frame.
  • the second drive unit changes the lateral distance of the pair of second claws by rotating the pair of the second arms with respect to the base frame.
  • the first drive unit and the second drive unit are configured to be able to control the rotation of the first arm and the rotation of the second arm independently of each other.
  • the pair of first claws are configured to be able to support the lower surfaces of both ends in the lateral direction of the first heating work in a state of being close to each other in the lateral direction.
  • the pair of second claws are configured to be able to support the lower surfaces of both ends in the lateral direction of the second heating work in a state of being close to each other in the lateral direction.
  • the positions of the pair of first claws in the vertical direction and the positions of the pair of second claws in the vertical direction are different from each other.
  • the lower surfaces of both ends of the first heating work are supported by a pair of claws of the first arm, and the lower surfaces of both ends of the second heating work are supported by the pair of claws of the second arm.
  • Transport As a result, the distance between the two heated workpieces during transportation can be kept stable. Further, since the first claw and the second claw are arranged on the lower surfaces of both ends of the heated work by the rotation of the first arm and the second arm, the operation of lifting and lowering the heated work can be easily and surely performed. .. That is, with a simple device configuration, the first heating work and the second heating work can be conveyed in a state where they can efficiently receive heat radiation from each other.
  • the first drive unit drives the first arm
  • the second drive unit drives the second arm independently of this, that is, in another system. Therefore, the first heating work and the second heating work can be sequentially lifted, and the first heating work and the second heating work can be sequentially lowered to different press positions.
  • the transport device can transport the first and second heating workpieces easily and efficiently while suppressing the temperature drop. Therefore, the temperature drop of the work (material) can be easily alleviated in the transport time from the heating of the material in the hot press forming to the start of the press forming.
  • the horizontal direction of the base frame is the in-plane direction perpendicular to the vertical direction.
  • the lateral direction in which the pair of first arms are arranged and the lateral direction in which the pair of second arms are arranged may be the same or may be different in a plane perpendicular to the vertical direction.
  • the base frame may be movable both vertically and laterally.
  • the pair of first claws and the pair of second claws are the maximum plates of the heating work supported by the claws located below the first claw and the second claw in the vertical direction.
  • the temperature drop of the heated work during transportation is effectively suppressed.
  • the plate thickness of the heated work changes by about 1 to 3 mm in one heated work
  • the maximum plate thickness of the heated work is 3 mm, so that the pair of first claws and the pair of first claws are used.
  • the two claws are preferably separated by a distance of 3 to 53 mm in the vertical direction.
  • the heating work transfer device may further include a side shielding plate that laterally covers both the pair of first claws and the pair of second claws.
  • the side shielding plate suppresses the movement of the warmed stagnant air between the two heated works to the outside and can maintain the heat retaining effect, so that the temperature drop of the heated work during transportation is further suppressed.
  • the side shielding plate may have a surface that is inclined so as to be closer to the pair of first claws and the pair of second claws as the side shielding plate approaches the end portion from the central portion.
  • the heating work transfer device may further include an upper shielding plate that covers the space between the pair of first arms and the space between the pair of second arms from above.
  • an upper shielding plate that covers the space between the pair of first arms and the space between the pair of second arms from above.
  • the air warmed by the heat transfer from the upper heating work can be retained between the upper heating work and the upper shielding plate.
  • the upper shielding plate overlaps with at least a part of each of the pair of first claws and the pair of second claws when viewed from above. As a result, the upper part of the first and second heating workpieces supported by the first claw and the second claw is covered with the upper shielding plate.
  • the effect of suppressing the temperature drop by the upper shielding plate can be further enhanced.
  • the upper shield plate extends to a wider range than the pair of first arms and the pair of second arms when viewed from above.
  • the upper shielding plate extends to a range excluding the range in which the pair of first arms and the pair of second arms are closed when viewed from above.
  • the upper shield plate may be connected to the side shield plate.
  • the upper shielding plate is not limited to a flat plate, and may have, for example, a shape that matches the shape of the heated work (for example, an intermediate molded product) to be conveyed.
  • the distance in the vertical direction between the upper shielding plate that covers both the pair of first claws and the pair of second claws from above and the claws located above the first and second claws is, for example, the above. It is preferably within 200 mm in addition to the maximum plate thickness of the heated work supported by the claws located above the first claw and the second claw. More preferably, this distance is 100 mm or less in addition to the maximum plate thickness. As a result, the effect of suppressing the temperature drop by the upper shielding plate can be further enhanced. For example, assuming that the plate thickness of the heated work changes by about 1 to 3 mm in one heated work, the maximum plate thickness of the heated work is 3 mm, so that the pair of first claws and the pair of second claws are used.
  • the vertical distance between the upper shielding plate that covers both of the claws from above and the claw located above the first and second claws is preferably 203 mm or less, more preferably 103 mm or less. Is preferable.
  • the upper shielding plate covering the upper part of the first claw and the second claw may be arranged between the base frame and the claw located above the first claw and the second claw. As a result, the upper shielding plate can be arranged at a position close to the upper part of the heated work supported by the claws. As a result, the effect of suppressing the temperature drop by the upper shielding plate can be further enhanced.
  • the base frame may be configured to be rotatable 180 degrees about the vertical direction.
  • the orientation of the first heating work supported by the claws of the first arm and the second heating work supported by the claws of the second arm can be changed by 180 degrees.
  • the heated work is a differential thickness plate
  • the directions of the first heated work and the second heated work can be changed by 180 degrees and held.
  • the thin portion of one of the first heated work and the second heated work and the thick portion of the other work can be held so as to overlap each other.
  • the distance between the pair of first claws and the pair of second claws in the vertical direction may be adjustable. Thereby, the interval between the first heating work and the second heating work during transportation can be adjusted according to the plate thickness, material, and other conditions of the work.
  • the heating work transfer device has a pair of third arms rotatably attached to the base frame and a pair of fourth arms rotatably attached to the base frame. And a third drive unit that drives the third arm, and a fourth drive unit that drives the fourth arm may be provided.
  • the pair of third arms are arranged in the lateral direction of the base frame and in the direction perpendicular to the direction in which the pair of first bases are arranged, and the pair of third bases extending in the vertical direction from the base frame and the pair of first bases. It has a third claw that flexes laterally and extends from each of the three bases.
  • the pair of fourth arms are arranged in the lateral direction of the base frame and in the direction perpendicular to the direction in which the pair of second bases are arranged, and the pair of fourth bases extending in the vertical direction from the base frame and the pair of first portions. It has a fourth claw that flexes laterally and extends from each of the four bases.
  • the third drive unit changes the lateral distance of the pair of third claws by rotating the pair of the third arms with respect to the base frame.
  • the fourth drive unit changes the lateral distance of the pair of fourth claws by rotating the pair of the fourth arms with respect to the base frame.
  • the position of the pair of first claws in the vertical direction is the same as the position of the pair of third claws in the vertical direction.
  • the position of the pair of second claws in the vertical direction is the same as the position of the pair of fourth claws in the vertical direction.
  • the hot press production line according to the embodiment of the present invention is heated by the transfer device according to any one of the above configurations 1 to 8, the heating device for heating the first heating work and the second heating work, and the heating device.
  • the heated work is press-molded by a pair of dies.
  • the heated work is press-molded by bringing the pair of dies relatively close to each other with the heated work placed between the pair of dies.
  • One press may be provided with at least two pairs of dies, or each of at least two presses may be equipped with a pair of dies.
  • the hot pressing production line of the above configuration 9 further includes a tray on which the first heating work and the second heating work are placed when the first heating work and the second heating work are heated by the heating device. It is also good.
  • the tray includes a tray main body, a plate-shaped heat storage material placed on the tray main body, and at least three first support columns extending upward from the tray main body or the heat storage material.
  • the first column group is arranged so that virtual straight lines connecting the columns form at least one triangle when viewed from above.
  • the tray may have a convex portion of the heat storage material that protrudes upward from the heat storage material and on which the first heating work and the second heating work can be placed, instead of the first support column group.
  • the first support column group may be fixed to the tray body or the heat storage material.
  • the hot pressing production line of the above configuration 9 further includes a tray on which the first heating work and the second heating work are placed when the first heating work and the second heating work are heated by the heating device. It is also good.
  • the tray has a shape that extends along a plane perpendicular to the vertical direction, and may include a tray body including a hollow portion that penetrates vertically, and a group of columns extending upward from the tray body.
  • the strut group is located above at least three first strut groups configured to support the lower surface of the plate-shaped first heating work and the first heating work supported by the first strut group. It may include at least three groups of second columns configured to support the lower surface of the second heating work.
  • the first column group is arranged so that virtual straight lines connecting the columns form at least one triangle when viewed from above.
  • the second strut group is arranged at a position different from that of the first strut group when viewed from above, and when viewed from above, the virtual straight lines connecting the columns are arranged so as to form at least one triangle.
  • the second strut group is higher than the lowest strut of the first strut group.
  • the first strut group and the second strut group may be fixed to the tray body.
  • FIG. 1 is a plan view showing an outline showing a hot pressing production line 10 according to the present embodiment.
  • the hot press production line 10 includes a material table 12, a heating device 14, transfer tables 16, 17, press machines 20, manipulators 41, 42, 44, a transfer device 46, a molded product table 18, and a controller. It is equipped with 22.
  • the end of the transport table 16 is connected to the outlet 14A of the heating device 14.
  • the end of the transport table 17 is connected to the inlet 14B of the heating device 14.
  • the material table 12 is arranged on the opposite side of the transport table 17 from the heating device 14.
  • a molded product table 18 is arranged on the opposite side of the transfer table 16 of the press machine 20.
  • the material table 12 is a table on which the material before pressing is placed. For example, a blank 24 obtained by cutting a flat steel plate into a predetermined shape is placed on a material table 12.
  • the molded product table 18 is a table on which a press-molded product is placed. For example, the press-molded product press-molded by the press machine 20 is arranged on the molded product table 18.
  • the heating device 14 is a device for heating an object (work) to be heated.
  • Examples of the heating device 14 include a resistance heating furnace, a gas heating furnace, a far-infrared heating furnace, a near-infrared heating furnace, and the like.
  • the heating device 14 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 directly energizes and heats an object to be heated.
  • the heating device 14 may have a heating chamber.
  • the heating device 14 may include a plurality of indoor rollers that are rotationally driven by a drive mechanism (not shown) inside the heating chamber. By rotating the indoor roller, the object to be heated on the indoor roller is conveyed.
  • the transport tables 16 and 17 include a plurality of transport rollers 26 that are rotationally driven by a drive mechanism (not shown). By rotating each transfer roller 26 in synchronization with the indoor roller, the transfer object (heating work) can be transferred between the transfer tables 16 and 17 and the heating chamber of the heating device 14.
  • the plurality of transport rollers 26 are arranged at intervals.
  • the transfer table 16 is an example of a table on which a heating work heated by a heating device is placed. Further, the transport table 16 is also an example of a transport path for transporting the heating work from the heating device to the lifting position. In this example, the position on the transfer table 16 is the lifting position of the heated work by the transfer device 46.
  • the configuration of the transport path is not limited to the transport table 16 shown in FIG.
  • the transport path may be a belt conveyor, a rail, or the like.
  • the lifting position is on the transport path, but the lift position does not have to be on the transport path.
  • a table that serves as a lifting position may be provided separately from the transport path.
  • the press machine 20 includes a lower die and an upper die for press-molding the object to be pressed.
  • the lower die is, for example, a punch die
  • the upper die is, for example, a die die.
  • the upper mold and the lower mold may be provided with a flow path for the refrigerant. As a result, the heat taken from the pressed object at the time of pressing can be released via the refrigerant.
  • Two heating workpieces can be placed between the upper mold and the lower mold.
  • the upper mold and the lower mold are relatively movable.
  • the press machine 20 press-molds the two heated workpieces by bringing the upper die and the lower die relatively close to each other in a state where the two heated workpieces are arranged between the upper die and the lower die.
  • the operation of the upper mold and the lower mold can be controlled by, for example, the controller 22.
  • the lower die and the upper die of the press machine 20 have a shape capable of manufacturing a plurality of press-molded products at the same time.
  • a plurality of workpieces are arranged between the lower die and the upper die of the press machine 20, and the plurality of workpieces are pressed at the same time.
  • a plurality of press machines may be provided.
  • two press machines equipped with a pair of dies may be provided.
  • the manipulator 44 uses the transport device 46 to transport the object to be conveyed between the transfer table 16 and the press machine 20.
  • the transport device 46 operates to lift, hold, and place the work, which is the object to be transported.
  • the manipulator 44 controls the position and posture of the transport device 46.
  • the transport device 46 may be an end effector of the manipulator 44.
  • the manipulator 44 moves the transfer device 46 between a position above the transfer table 16 and a position between two pairs of dies (upper and lower dies) of the press 20.
  • the manipulator 44 comprises a base that is rotatable about at least one axis and an arm that extends from the base and has at least one joint.
  • the transport device 46 is rotatably attached to the tip of the arm.
  • the moving device for moving the transport device 46 is not limited to the manipulator.
  • the moving device may include a rail connecting the transfer table 16 and the press machine 20, and a suspension device for suspending the transfer device 46 up and down on the rail.
  • a manipulator 41 for moving the work from the material table 12 to the transfer table 17 and a manipulator 42 for carrying out the work from the press machine 20 and placing it on the molded product table 18 are provided.
  • the controller 22 controls the heating device 14, the transfer tables 16, 17, the press machine 20, and the manipulators 41, 42, 44.
  • the controller 22 is configured as a control system including, for example, at least one computer.
  • the controller 22 is provided in each of the heating device 14, the transfer table 16, 17, the manipulators 41, 42, 44, and the press machine 20, and is composed of a control unit (for example, a circuit or a processor) that controls each device. ) May be included.
  • the controller 22 may include a general control computer that supplies control information to the control unit of each device and controls the entire operation of the hot press manufacturing line 10.
  • the operation of the arm of the transport device 46 which will be described later, may be controlled by a part of the controller 22, for example, a control unit of the manipulator 44.
  • FIG. 2A is a side view showing a configuration example of the transport device 46 of FIG. 1 as viewed from the lateral direction (y direction).
  • FIG. 2B is a diagram showing a state in which the second arm 72 of the transport device 46 of FIG. 2A is opened to the outside.
  • FIG. 3 is a side view showing a configuration example of the transport device 46 of FIG. 1 as viewed from the lateral direction (x direction).
  • the transfer device 46 includes a base frame 48, a pair of first arms 71 rotatably attached to the base frame 48, and a pair of second arms 72.
  • the shape of the base frame 48 is rectangular when viewed from above (see FIG. 1).
  • the vertical direction is the z direction.
  • the direction in the plane perpendicular to the vertical direction is the horizontal direction.
  • the long direction of the base frame 48 is the y direction, and the short direction is the x direction.
  • a joint 56 connected to the manipulator 44 is provided on the upper surface of the base frame 48.
  • the joint 56 is connected so that the base frame 48 can rotate about the vertical direction with respect to the manipulator 44.
  • the pair of first arms 71 are arranged apart from each other in the lateral direction (x direction).
  • Each of the pair of first arms 71 has a first base portion 71a extending in the vertical direction from the base frame 48 and a first claw 71b extending in the lateral direction from the first base portion 71a.
  • Each first arm 71 is rotatably attached to the base frame 48 about a rotation shaft 60 in the y direction.
  • One end of the first base 71a is rotatably connected to the base frame 48, and the first claw 71b extends from the other end.
  • the pair of second arms 72 are arranged apart from each other in the lateral direction (x direction).
  • Each of the pair of second arms 72 has a second base portion 72a extending vertically from the base frame 48 and a second claw 72b extending laterally from the second base portion 72a.
  • Each second arm 72 is rotatably attached to the base frame 48 about a rotation shaft 60 in the y direction.
  • One end of the second base 72a is rotatably connected to the base frame 48, and the second claw 72b extends from the other end.
  • the position of the pair of first claws 71b in the vertical direction and the position of the pair of second claws 72b in the vertical direction are different from each other.
  • the first base portion 71a is shorter than the second base portion 72a in the vertical direction.
  • the first claw 71b is closer to the base frame 48 than the second claw 72b.
  • the pair of first claws 71b and the pair of second claws 72b are provided only at a distance of 0 to 50 mm in the vertical direction in addition to the maximum plate thickness of the second heating work W2 supported by the second claw 72b located below. It is preferable that they are separated. That is, it is preferable that the distance D between the first heating work W1 supported by the first claw 71b and the second heating work W2 supported by the second claw 72b is 0 to 50 mm. For example, when the plate thickness of the second heating work W2 changes by about 1 to 3 mm in the second heating work W2, the distance H between the pair of first claws 71b and the pair of second claws 72b in the vertical direction is determined.
  • the distance H is such that the pair of first claws 71b supports the lower surface of the first heated work, and the pair of second claws 72b supports the lower surface of the second heated work. The distance between the claw 72b and the claw 72b. The distance H is the distance between the upper end of the first claw 71b and the upper end of the second claw 72b in the vertical direction.
  • the interval D (distance). H) is preferably close.
  • the interval D is more preferably 30 mm or less, further preferably 20 mm or less, and further preferably 10 mm or less.
  • the interval D There may be a part where the interval D becomes 0. That is, at least a part of the first heating work W1 supported by the first claw 71b and at least a part of the second heating work W2 supported by the second claw 72b may be in contact with each other (specific examples will be described later). .. Further, as an example is shown in FIG. 2A, the first claw 71b supporting the first heating work W1 is between the first heating work W1 and the second heating work W2 supported by the second claw 72b. May be inserted.
  • the lower limit of the thickness of the nail may be set as the lower limit of the interval D. The lower limit of the nail thickness depends on the required nail strength. From this viewpoint, the lower limit of the interval D is preferably, for example, 3 mm, more preferably 5 mm.
  • the rotation shaft 60 of the first arm 71 and the rotation shaft 60 of the second arm 72 are coaxial.
  • the first arm 71 and the second arm 72 can be efficiently arranged on the base frame 48.
  • the rotation shaft 60 of the first arm 71 and the rotation shaft 60 of the second arm 72 do not have to be coaxial.
  • the pair of second arms 72 is driven by the second drive unit.
  • the second drive unit rotates the pair of second arms 72 with respect to the base frame 48 to change the lateral (x direction) distance of the pair of second claws 72b.
  • the second drive unit is composed of an actuator 82 provided for each second arm 72.
  • the actuator 82 is, for example, an air cylinder.
  • the actuator 82 adjusts the extension amount of the operating shaft 82A that moves in the axial direction.
  • a pin 82B is provided at the end of the operating shaft 82A.
  • the pin 82B is movably and rotatably inserted into the slotted hole of the link 90 fixed to the second arm 72.
  • the pair of first arms 71 is driven by the first drive unit.
  • the first drive unit rotates the pair of first arms 71 with respect to the base frame 48 to change the lateral distance (x direction) of the pair of first claws 71b.
  • the first drive unit that drives the first arm 71 may also be configured to include, for example, an actuator similar to the actuator 82 shown in FIGS. 2A and 2B.
  • the pair of first arms 71 is also in a closed state in which the pair of first claws 71b are close to each other by the first drive unit (see FIG. 2A), or the pair of first claws 71b are opened apart from each other in the closed state. It is controlled to be in a state.
  • the actuators of the first drive unit and the second drive unit are not limited to air cylinders, and may be, for example, motors or hydraulic cylinders.
  • the pair of first claws 71b can support the lower surfaces of both ends in the lateral direction of the first heating work W1 in a state of being close to each other in the lateral direction, that is, in a closed state.
  • the pair of second claws 72b can support the lower surfaces of both ends in the lateral direction of the second heating work W2 in a state of being close to each other in the lateral direction, that is, in a closed state.
  • a pair of third arms 73 and a pair of fourth arms 74 are rotatably attached to the base frame 48. Further, although not shown, a third drive unit for driving the pair of third arms 73 and a fourth drive unit for driving the pair of fourth arms 74 are provided on the base frame 48. In FIG. 3, the first to fourth drive units are not shown.
  • the pair of third arms 73 are arranged side by side in the direction (y direction) perpendicular to the direction (x direction) in which the pair of first arms 71 are lined up (see FIG. 3).
  • Each third arm 73 is rotatably attached to the base frame 48 about a rotation shaft 62 in a direction (x direction) perpendicular to the rotation shaft 60 of the first arm.
  • Each third arm 73 can be configured in the same manner as each first arm 71.
  • Each third arm 73 has a third base 73a and a third claw 73b.
  • a pair of third claws 73b and a pair of first claws 71b support the lower surface of the first heating work W1.
  • the distance of the third claw 73b from the base frame 48 is substantially the same as that of the first claw 71b. This is an example when the first heating work W1 is a flat plate.
  • the pair of fourth arms 74 are arranged side by side in the direction (y direction) perpendicular to the direction (x direction) in which the pair of second arms 72 are lined up (see FIG. 3).
  • Each of the fourth arms 74 is rotatably attached to the base frame 48 about a rotation shaft 62 in a direction (x direction) perpendicular to the rotation shaft 60 of the second arm.
  • Each fourth arm 74 can be configured in the same manner as each second arm 72.
  • Each fourth arm 74 has a fourth base 74a and a fourth claw 74b.
  • a pair of fourth claws 74b and a pair of second claws 72b support the lower surface of the second heating work W2.
  • the distance of the fourth claw 74b from the base frame 48 is substantially the same as that of the second claw 72b. This is an example when the second heating work W2 is a flat plate.
  • FIG. 4 is a diagram for explaining an example of a control system of the first to fourth drive units.
  • FIG. 4 shows an example of the arrangement of the first to fourth drive units in the base frame 48.
  • the actuator 81 of the four first drive units, the actuator 82 of the four second drive units, the actuator 83 of the two third drive units, and the actuator 84 of the two fourth drive units are the base frames. It is placed on the upper surface of.
  • the actuators 81 and 83 of the first and third drive units are controlled by the first control system.
  • the actuators 82 and 84 of the second and fourth drive units are controlled by the second control system.
  • the actuators 81 and 83 are controlled by the same control signal, and the actuators 82 and 84 are controlled by the same control signal.
  • the actuators 81 to 84 are air cylinders, for example, the control valves of the actuators 81 and 83 may be shared, and the control valves of the actuators 82 and 84 may be shared.
  • the first arm 71 and the second arm 72 are driven by different systems. That is, the rotation of the first arm 71 and the rotation of the second arm 72 are controlled independently of each other. Further, the third arm 73 and the fourth arm 74 are also driven by different systems. The first arm 71 and the third arm 73 are driven by the same system. The second arm 72 and the fourth arm 74 are driven by the same system. The first arm 71 and the third arm 73 may be driven by different systems. The second arm 72 and the fourth arm 74 may also be driven by different systems.
  • the manufacturing process of the press-molded product in the present embodiment includes a heating process for heating the work, a transfer process for transporting the heated work, and a pressing process for pressing the heated work.
  • FIG. 5 is a diagram showing an example of a heating process.
  • the heating step at least two plate-shaped workpieces W1 and W2 are simultaneously heated by the heating device 14.
  • the heating of the plurality of works may be completed at the same time, and the heating may not be started at the same time.
  • the case where the end points of heating of the plurality of works are exactly the same, the case where the end points of the work are slightly different is included in the embodiment of heating the plurality of works at the same time.
  • the heated work that has been heated is taken out of the heating device 14 by the rotation of the roller 13 of the heating device 14 and the transfer roller 26 of the transfer table 16.
  • the transfer process includes a step of lifting the first heating work W1 by the transfer device 46, a step of lifting the second heating work W2 by the transfer device 46, a step of transporting the first and second heating works W1 and W2, and a first heating work W1. Includes a step of lowering the second heating work W2 to the press position and a step of lowering the second heating work W2 to the press position.
  • FIG. 6 is a diagram showing an example of a process in which the transfer device 46 lifts the first heating work W1.
  • a pair of first arms 71 rotatably attached to the base frame of the transport device 46 is driven, and the claws of the pair of first arms 71 support and lift the lower surfaces of both ends of the first heating work W1.
  • the pair of first arms 71 and the pair of second arms 72 are opened, and the transfer device 46 is lowered to bring it closer to the first heating work W1 on the transfer roller 26 of the transfer table 16.
  • the first claws of the pair of first arms 71 are made to slip below the lower surfaces of both ends of the first heating work W1. In this state, by raising the transport device 46, the lower surfaces of both ends of the first heating work W1 are supported and lifted by the first claws of the pair of first arms 71.
  • FIG. 7 is a diagram showing an example of a process in which the transfer device 46 lifts the second heating work W2.
  • the transfer device 46 drives the pair of second arms 72 to lift the second heating work W2 while the lower surface of the first heating work W1 is supported and held by the pair of first arms 71. Similar to the lifting operation of the first heating work W1, the transport device 46 supports and lifts the lower surfaces of both ends of the second heating work W2 with the claws of the pair of second arms 72.
  • FIG. 8 On the left side of FIG. 8, an example of a state in which the transfer device 46 conveys the first heating work W1 and the second heating work W2 is shown.
  • the transport device 46 first heats the first heating work W1 whose lower surface is supported by the claws of the pair of first arms 71 and the second heating work W2 whose lower surface is supported by the claws of the pair of second arms 72.
  • the work W1 is conveyed so as to overlap each other in the normal direction of the plate surface.
  • the distance D in the linear direction is preferably 0 to 50 mm.
  • the interval D is more preferably 30 mm or less, further preferably 20 mm or less, and further preferably 10 mm or less. There may be a portion where the interval D becomes 0. Further, for example, the lower limit of the thickness of the nail may be set as the lower limit of the interval D. From this viewpoint, the lower limit of the interval D is preferably, for example, 3 mm, more preferably 5 mm.
  • the interval D corresponds to a value obtained by subtracting the thickness of the second heating work W2 from the vertical distance H between the first claw 71b of the first arm 71 and the second claw 72b of the second arm 72.
  • the interval D corresponds to a value obtained by subtracting the thickness of the second heating work W2 from the vertical distance H between the first claw 71b of the first arm 71 and the second claw 72b of the second arm 72.
  • FIG. 8 shows an example in which the transfer device 46 lowers the second heating work W2 to the press position.
  • the transfer device 46 moves to the press position of the second heating work W2.
  • the transfer device 46 drives the pair of second arms 72 to open the second heating work W2 while the pair of first arms 71 support and hold the lower surface of the first heating work W1. Lower it to the press position of the press machine 20.
  • the transfer device 46 moves to the press position of the first heating work W1, drives the pair of first arms 71 to open the open state, and lowers the first heating work W1 to the press position of the press machine.
  • the first heating work W1 and the second heating work W2 are lowered to different press positions between the upper die 21 and the lower die 23, respectively.
  • the mode in which the transfer device 46 lowers the two held heating works to the respective press positions is not limited to this.
  • the first heating work W1 and the second heating work W2 may be lowered to the respective press positions of the two press machines.
  • the second heating work W2 is lowered to the press position of the lower die 23 and is arranged in contact with the lower die 23.
  • the mode in which the first heating work W1 and the second heating work W2 are arranged on the lower mold 23 is not limited to this.
  • a plunger pin or the like can be provided at a position on the lower mold 23 where the heating work is arranged, and the heating work can be arranged on the plunger pin. That is, the heating work may be supported at a position slightly higher than the upper surface of the lower mold 23, which is the pressure surface, and may be held in a state of being floated from the pressure surface.
  • the heated work becomes the lower mold 23 between the time when the heated work is placed on the lower mold and the time when the molding of the heated work is started by the upper mold 21 and the lower mold 23. It is possible to prevent continuous contact. This makes it possible to prevent the temperature of the heated work from unintentionally and partially dropping significantly before the start of molding. Generally, since the plunger pin has a small contact area with the heated work, even if the plunger pin is in contact with the heated work, the temperature of the heated work does not drop significantly. Further, when a force is applied to the plunger pin from the upper die 21 via the heating work, the plunger pin is immediately stored inside the lower mold 23, which may interfere with the press forming of the heating work. do not have.
  • the plunger pin is a movable protrusion that protrudes upward from the upper surface of the lower mold 23, which is the pressure surface of the lower mold 23, and can be stored in the lower mold 23 at the bottom dead center when the heating work is arranged.
  • the configuration for arranging the heating work at intervals with respect to the pressure surface of the lower mold 23 is not limited to the configuration using movable protrusions.
  • the press machine 20 may be provided with a cushion or the like that holds the heated work in a position where it does not come into contact with the lower die 23 and the upper die 21 before molding.
  • the material of the heating work may be any metal that can be molded.
  • the material of the heating work is not limited to these, and examples thereof include Fe-based carbon steel, stainless steel, Al-based, and Ti-based materials.
  • the heated work may have a plating layer.
  • the heated work may be a plated steel plate.
  • the plating layer include a plating layer such as an aluminum alloy, an aluminum alloy, a zinc alloy, or a zinc alloy.
  • the heated work is a plated steel sheet
  • oxide scale is less likely to occur during transportation.
  • the oxide scale is formed on the lower surface of the upper heating work W1 while the two heating works W1 and W2 are stacked vertically on the transfer device 46
  • the oxidation scale falls off and the upper surface of the lower heating work W2 is formed. May fall into.
  • the oxidation scale formed on the lower surface of the lower heating work W2 may also fall off. In such a case, the difference in the amount of adhesion of the oxide scale between the upper surface and the lower surface of the lower heating work W2 may be larger than the difference in the upper heating work W1.
  • the difference in the amount of scale adhesion may lead to the difference in the frictional characteristics between the mold and the surface of the work in press molding. As a result, it may be necessary to individually adjust the mold and set the molding conditions for each heated work. Therefore, by using a plated steel sheet for the heated work, it is possible to suppress the generation of oxide scale during transportation and suppress variations in the characteristics of the heated work.
  • the first heating work W1 and the second heating work W2 are conveyed by the conveying device 46 in a state of being overlapped with each other at intervals in the vertical direction. This makes it possible to suppress variations in the characteristics of the upper surface and the lower surface of each heated work, and variations in the characteristics of the upper surface and the lower surface between the upper heated work and the lower heated work.
  • the time of contact with air differs between the overlapping surface of each heating work and the opposite surface.
  • the first and second heating works W1 and W2 are non-plated plates, the amount of oxidation scale generated may differ between the upper surface and the lower surface. If the amount of oxide scale differs between the upper surface and the lower surface, the friction characteristics between the upper surface and the lower surface may differ. Further, in the first heating work W1 and the second heating work W2, the orientations of the overlapped surface and the opposite surfaces are upside down, so that there is a difference in friction characteristics between the first heating work W1 and the second heating work W2. It can occur.
  • the time required for die adjustment and molding condition setting in press molding may increase. Therefore, by transporting the first heating work W1 and the second heating work W2 at intervals, it is possible to reduce the variation in the friction characteristics between the upper surface and the lower surface of the heating work.
  • the shape of the heated work is not limited to the case of a flat plate as in the above example.
  • the heated work may be a press-molded intermediate molded product. Further, the shapes or sizes of the first heating work W1 and the second heating work W2 do not have to be the same.
  • FIG. 9 is a diagram showing an example in the case where the first heating work W1 and the second heating work W2 are intermediate molded products.
  • the positions of the first claw 71b of the first arm 71 and the third claw 73b of the third arm 73 in the vertical direction are different.
  • the positional relationship between the first claw 71b and the third claw 73b is determined according to the shape of the intermediate molded product.
  • the first claw 71b and the third claw 73b are configured to support the lower surface of the first heating work W1.
  • the positions of the second claw 72b of the second arm 72 and the fourth claw 74b of the fourth arm 74 in the vertical direction are also different.
  • the positional relationship between the second claw 72b and the fourth claw 74b is determined according to the shape of the intermediate molded product.
  • the second claw 72b and the fourth claw 74b are configured to support the lower surface of the second heating work W2.
  • FIG. 10 is a diagram showing an example in which the sizes of the first heating work W1 and the second heating work W2 are different.
  • the amount of protrusion of the first claw 71b in the lateral direction and the pair of second arms 72 are the second heating work W2.
  • the amount of protrusion of the second claw 72b in the lateral direction when supporting the second claw 72b is different. In this way, the amount of protrusion of the first claw 71b and the second claw 72b can be determined according to the size of the heated work (area of the plate surface).
  • the figure on the left of FIG. 10 is a configuration example of the transport device 46 for transporting the heated work of the flat plate
  • the figure on the right of FIG. 10 is a configuration example of the transport device 46 for transporting the intermediate molded product having a shape other than the flat plate. Is.
  • FIG. 11 is a diagram showing an example in which the shapes of the first heating work W1 and the second heating work W2 are different.
  • the positions of the first claw 71b of the first arm 71 and the positions of the third claw 73b of the third arm 73 are arranged so as to match the shape of the first heating work W1.
  • the position of the second claw 72b of the second arm 72 and the position of the fourth claw 74b of the fourth arm 74 are arranged so as to match the shape of the second heating work W2.
  • the transport device 46 may further include a side shielding plate that laterally covers both the pair of first claws 71b and the pair of second claws 72b.
  • FIG. 12 is a diagram showing an example in which the side shielding plate is provided in the transport device 46.
  • the side shielding plate 92 is attached to the lateral outside of the second arm 72.
  • the side shielding plate 94 is attached to the laterally outer side of the fourth arm 74.
  • the lateral shielding plate is attached to the lateral outer side of the arm in which the claw is located at the lowermost position among the plurality of arms.
  • FIG. 13 is a diagram showing another example in which the side shielding plate is provided in the transport device 46.
  • the side shielding plate 91 is attached to the inside of the first arm 71 in the lateral direction.
  • the side shielding plate 93 is attached to the inside of the third arm 73 in the lateral direction.
  • the side shield plate is attached to the lateral inner side of the arm in which the claw is located at the uppermost position among the plurality of arms.
  • the side shielding plates 91 to 94 include the first heating work W1, the second heating work W2, and the second arm 72 in a state where the first arm 71 and the second arm 72 support the first heating work W1 and the second heating work W2. It is provided at a position that covers the space between them from the lateral direction. As a result, air flows into the space between the first heating work W1 and the second heating work W2 during transportation, and both heatings originally existed between the first heating work W1 and the second heating work W2.
  • the side shielding plate prevents the air warmed by the heat transfer from the work from flowing out from the space between the two heated works. Therefore, the heat retaining effect due to the warmed stagnant air between the first heating work W1 and the second heating work W2 can be maintained, and the temperature drop of the heated work during transportation can be further suppressed.
  • FIG. 14 is a diagram showing a modified example of the shape of the side shielding plate.
  • the side shielding plate 92 has a surface that is inclined so as to be closer to the pair of first claws 71b and the pair of second claws 72b in the lateral direction as the side shielding plate 92 approaches the end portion from the central portion. That is, the side shielding plate 92 has a curved shape so that the central portion protrudes outward in the lateral direction and the end portion is located inward in the lateral direction with respect to the central portion. As a result, the air that hits the side shielding plate can flow in the direction away from the heating work in the vertical direction.
  • FIG. 14 is a diagram showing a modified example of the shape of the side shielding plate.
  • the side shielding plate 92 has a surface that is inclined so as to be closer to the pair of first claws 71b and the pair of second claws 72b in the lateral direction as the side shielding plate 92 approaches the end portion from the central portion. That is, the
  • the side shielding plate when viewed from the side of the transport device, has a surface that is inclined inward in the lateral direction from the central portion to the end portion.
  • the side shielding plate When viewed from above the transport device, may have a surface that is inclined inward in the lateral direction from the central portion to the end portion.
  • the side shielding plate 92 covers the long direction of the base frame 48. Therefore, in the transfer step, the side shielding plate 92 covers the long direction of the first heating work W1 and the second heating work W2. As a result, the side shielding plate prevents air from flowing into the space between the first heating work W1 and the second heating work W2 from the long direction during transportation.
  • side shielding plates are provided in both the long direction and the short direction. A side shielding plate may be provided in either the long direction or the short direction.
  • FIG. 15 is a diagram showing another example in which the upper shielding plate is provided on the transport device 46.
  • an upper shielding plate 95 that covers the upper part of the heated work is provided.
  • the upper shielding plate 95 is arranged at a position where it overlaps with both the first claw 71b and the second claw 72b when viewed from above.
  • the upper shield plate 95 is supported by a plurality of support members 96 extending in the vertical direction from the base frame 48.
  • the upper shielding plate 95 is arranged between the base frame 48 and the first claw 71b of the pair of first arms 71. Therefore, the upper shielding plate 95 can be arranged near the first heating work W1 supported by the first claw 71b.
  • the air above the first heating work W1 heated by heat transfer from the first heating work W1 tends to stay between the first heating work W1 and the upper shielding plate 95.
  • the heat retaining effect of the first heating work W1 can be obtained.
  • the distance J1 in the normal direction of the plate surface of the first heating work W1 between the first heating work W1 and the upper shielding plate 95 above the first heating work W1 is preferably 200 mm or less. , 100 mm or less is more preferable.
  • the distance J2 in the vertical direction between the upper shielding plate 95 and the first claw 71b is preferably not more than the distance obtained by adding 200 mm to the maximum plate thickness of the first heating work W1. More preferably, it is not more than a distance obtained by adding 100 mm to the maximum plate thickness of the first heating work W1.
  • the maximum plate thickness of the first heating work W1 is 3 mm, so that the upper shielding plate 95 and the first claw 71b
  • the vertical distance J2 between the two is preferably 203 mm or less, and more preferably 103 mm or less.
  • the figure on the left of FIG. 15 is a configuration example of the transport device 46 for transporting the heated work of the flat plate.
  • the upper shielding plate 95 has the shape of a flat plate.
  • the figure on the right of FIG. 15 is a configuration example of a transport device 46 for transporting an intermediate molded product having a shape other than a flat plate.
  • the upper shielding plate 95 has a shape that conforms to the intermediate molded product.
  • the shape of the upper shielding plate 95 is not limited to a specific object. Further, the upper shielding plate 95 may extend to the outside of the first arm 71 and the second arm 72 when viewed from above.
  • the transport device 46 may include both the side shield plate (92, 94 or 91, 93) shown in FIG. 12, FIG. 13 or FIG. 14, and the upper shield plate 95 shown in FIG.
  • the upper shield plate 95 may be connected to the side shield plate (92, 94 or 91, 93).
  • FIG. 16 is a diagram showing an example of a transfer device 46 that conveys a difference thickness plate.
  • the first heating work W1 and the second heating work W2 are differential thickness plates including a thick portion and a thin portion.
  • the thin portion of the first heating work W1 is conveyed in a state of being overlapped in the normal direction of the plate surface of the first heating work W1.
  • the thick portion having a relatively large heat capacity is conveyed to the thin portion having a thin plate thickness and the temperature tends to drop so as to face the thin portion. Therefore, it is possible to further suppress the temperature drop of the thin-walled portion. As a whole, the temperature drop of the heated work can be efficiently suppressed.
  • the transport device 46 drives the first arm 71 to lift the first heating work W1, and then rotates the base frame 48 by 180 degrees about the vertical direction. After that, the second arm 72 can be driven to lift the second heating work W2. As a result, even if the directions of the first heating work W1 and the second heating work W2 on the transfer table 16 after heating are the same and the positions of the thin-walled portions are the same, the transfer device 46 transfers the second heating work W2. Since the thin-walled portion is rotated and held by 180 degrees, the first and second heating works W1 and W2 can be held in an overlapping manner with the positions of the thin-walled portions reversed.
  • the difference thickness plate may be, for example, a tailored blank material in which the ends of steel plates having different plate thicknesses are butted and joined.
  • the differential thickness plate may be a patchwork tailored blank material in which steel plates having different dimensions are stacked and joined.
  • the differential thickness plate may be a tailor-rolled blank material in which one steel plate is partially changed in thickness by processing such as rolling.
  • FIG. 17 is a diagram showing a modified example of the first arm 71 and the second arm 72.
  • the connection portion between the first base portion 71a and the first claw 71b of the first arm 71 is rotatable. That is, the first claw 71b is rotatably connected to the first base portion 71a about an axis in the lateral direction (y direction).
  • the first base 71a is fixed to the base frame 48.
  • the second claw 72b is rotatably connected to the second base portion 72a about the axis in the lateral direction (y direction). In this way, by making the claws of the arm rotatable and controlling the rotation of the claws, it is possible to control the lateral position of the claws and realize the operation of lifting and lowering the heated work.
  • the first arm 71 further has a claw 71c that supports the upper surface of the first heating work W1.
  • the second arm 72 further has a claw 72c that supports the upper surface of the second heating work W2.
  • the arm may be provided with a claw that supports the upper surface of the heated work.
  • FIG. 18 is a diagram showing other modifications of the first arm 71 and the second arm 72.
  • the first arm 71 is rotatably attached to the base frame 48 about the vertical direction (z direction).
  • the second arm 72 is also rotatably attached to the base frame 48 about the vertical direction (z direction). In this way, the arm can be configured to control the amount of extension of the claw inward in the lateral direction by rotating the arm about the vertical direction.
  • the distance between the pair of first claws 71b and the pair of second claws 72b in the vertical direction may be adjustable.
  • at least one of the first base portion 71a of the first arm 71 and the second base portion 72a of the second arm 72 can be configured to be vertically expandable and contractible.
  • at least one of the first base portion 71a and the second base portion 72a may be provided with an expansion / contraction mechanism that expands / contracts in the vertical direction. This makes it possible to adjust the position of the claws so as to match the heated work to be transported.
  • the distance between the pair of third claws 73b and the pair of fourth claws 74b in the vertical direction may also be adjustable in the same manner.
  • FIG. 19 is a diagram showing a modified example of the support structure of the first heating work W1 and the second heating work W2 by the transfer device 46.
  • FIG. 20 is a perspective view showing only the first heating work W1 and the second heating work W2 in a state of being supported by the transfer device 46 shown in FIG.
  • the first heating work W1 and the second heating work W2 are overlapped in the vertical direction (normal direction of the first heating work W1) and are in contact with each other on the transport device 46. Be supported.
  • the top surfaces are in contact with each other.
  • a part of the lower surface of the first heating work W1 supported on the upper side is in contact with the entire upper surface of the second heating work W2 supported on the lower side.
  • the distance D between the first heating work W1 and the second heating work W2 is 0 mm.
  • the width B1 of the plate surface of the first heating work W1 supported on the upper side is larger than the width B2 of the second heating work W2 supported on the lower side.
  • the distance between the pair of second claws 72b supporting the second heating work W2 is smaller than the distance between the pair of first claws 71b supporting the first heating work W1. That is, the second claw 72b protrudes inward from the first claw 71b.
  • the distance H between the pair of first claws 71b and the pair of second claws 72b in the vertical direction is set to be substantially the same as the plate thickness of the second heating work W2.
  • FIG. 21 is a diagram showing another modification of the support structure of the first heating work W1 and the second heating work W2 by the transport device 46.
  • FIG. 22 is a perspective view showing only the first heating work W1 and the second heating work W2 in a state of being supported by the transfer device 46 shown in FIG. 21.
  • the first heating work W1 and the second heating work W2 are overlapped in the vertical direction (normal direction of the first heating work W1) and are in contact with each other on the transport device 46. Be supported. Specifically, the lower surface of the first heating work W1 supported by the pair of first claws 71b of the first arm 71 and the second heating work W2 supported by the pair of second claws 72b of the second arm 72.
  • the upper surfaces are separated at both ends in the width direction and are in contact with each other at the portion between the ends.
  • the distance D between the first heating work W1 and the second heating work W2 is 0 mm in the portion between both ends.
  • the shape seen from above of the first heating work W1 supported on the upper side and the second heating work W2 supported on the lower side are the same.
  • the first claw 71b is inserted into the separated portions of both ends of the first heating work W1 and the second heating work W2.
  • the distance D between the separated portions at both ends is larger than the thickness (vertical dimension) of the first claw 71b.
  • both ends of the first heating work W1 supported on the upper side are curved so as to be located above the space between the two ends.
  • Both ends of the second heating work W2 supported on the lower side are curved so as to be located below the space between the two ends.
  • the form in which both ends are separated is not limited to this.
  • both ends of either one of the first heating work W1 and the second heating work W2 may be curved, and both ends of the other may not be curved.
  • the distance H between the pair of first claws 71b and the pair of second claws 72b in the vertical direction is 0 to 50 mm in addition to the plate thickness of the second heating work W2, as in the case of FIG. 2A. It is preferable to do so.
  • the lower limit of the thickness of the first claw 71b is added to the plate thickness of the second heating work W2.
  • the value may be used as the lower limit of the distance H.
  • the lower limit of the distance H is preferably, for example, the plate thickness of the second heating work W2 + 3 mm, and more preferably the plate thickness of the second heating work W2 + 5 mm.
  • the separated portions of the ends of the first heating work W1 and the second heating work W2 are provided on a pair of long sides, but the ends are separated.
  • the form is not limited to this.
  • the separated portions of the ends of the first heating work W1 and the second heating work W2 may be provided on a pair of sides in the short direction. Further, it may be provided on both the pair of long sides and the pair of short sides.
  • FIG. 24 is a diagram showing an example of a support structure of the first heating work W1 and the second heating work W2 by the transfer device 46 in this case.
  • FIG. 25 is a perspective view showing only the first heating work W1 and the second heating work W2 in a state of being supported by the transfer device 46 shown in FIG. 24. In the example shown in FIGS.
  • the portions corresponding to the pair of first claws 71b of the first arm 71 at both ends in the width direction of the first heating work W1 and the second heating work W2 are separated from each other in the width direction.
  • the other parts at both ends are in contact with each other.
  • the portions corresponding to the pair of third claws 73b of the third arm 73 at both ends in the length direction of the first heating work W1 and the second heating work W2 are separated from each other, and other portions at both ends in the length direction. Are in contact with each other. As a result, it is possible to reduce the number of separated portions of the ends of the first and second heating works W1 and W2.
  • both the first heating work W1 and the second heating work W2 are curved.
  • both ends of either the first heating work W1 and the second heating work W2 may be curved and the other end may not be curved.
  • FIG. 27 is a diagram showing a configuration example of a hot pressing production line 10 when the first and second heating works W1 and W2 are conveyed by using a tray and a heat storage material.
  • the hot pressing production line 10 shown in FIG. 27 further includes a tray 1.
  • the tray 1 is a tray on which the first heating work W1 and the second heating work W2 are placed on the heating device 14 and the transfer table 16.
  • the tray 1 has a tray main body 2, a heat storage material 5 placed on the tray main body 2, and a first support column group 3.
  • the first column group 3 includes at least three columns extending upward from the tray main body 2 or the heat storage material 5 to a position higher than the upper surface of the heat storage material 5.
  • the first column group 3 is arranged so that the virtual straight lines connecting the columns form at least one triangle when viewed from above.
  • FIG. 27 shows an example in which the first and second heating works W1 and W2 are heated by the heating device 14 in a state of being placed on one tray 1 and conveyed by the transfer table 16.
  • the first and second heating works W1 and W2 may be heated and transported in a state where they are placed one by one on separate trays. Further, it may be heated and conveyed with three or more heated workpieces placed on one tray.
  • each of the first heating work W1 and the second heating work W2 is heated in a state of being supported by the first support column group 3.
  • the first heating work W1 and the second heating work W2 are supported at different positions when viewed from above, above the heat storage material 5 and at positions overlapping with the heat storage material 5.
  • the first heating work W1 and the second heating work W2 are transferred from the heating device 14 to the lifting position by the transfer device 46 on the transfer table 16 in a state of being placed on the tray 1.
  • the first and second heating works W1 and W2 are in a state of overlapping with the heat storage material 5 during the period from after heating until they are lifted by the transport device 46. Therefore, the temperature drop is alleviated. Further, when the transport device 46 lifts the first heating work and the second heating work W2 placed on the first support column group 3 upward, the first support column group 3 does not become an obstacle.
  • the heat storage material 5 is in contact with the tray main body 2.
  • the arrangement of the heat storage material 5 is not limited to this.
  • the heat storage material 5 is placed on a second support column group provided separately from the first support column group 3, and is arranged at a position where the heat storage material 5 is vertically overlapped with the tray main body 2 at a distance. You may.
  • the second column group includes at least three columns extending upward from the tray main body 2 and arranged at different positions from the first column group 3 when viewed from above. As a result, deformation of the tray body 2 due to heat can be suppressed.
  • the tray body 2 has a shape that extends vertically in the vertical direction, and may include a hollow portion that penetrates vertically. As a result, in the heating step, the heat from the bottom of the tray main body 2 is easily transferred to the heat storage material 5 and the first and second heating works W1 and W2.
  • the area of the upper surface of the heat storage material 5 may be larger than the area of the upper surface of the first and second heating works W1 and W2.
  • the heating step and the transporting step in which the first and second heating workpieces W1 and W2 are transported to the lifting position by the transporting device 46 while being mounted on the tray 1 the top of the tray body 2 is viewed from above.
  • the outer edge of the heat storage material 5 placed in is preferably located outside the outer edges of the first and second heating works W1 and W2 placed on the first support column group 3.
  • the entire first and second heating works W1 and W2 receive radiant heat from the heat storage material 5. Therefore, the temperature of the entire heated work can be easily maintained uniformly.
  • the plate thickness of the heat storage material 5 may be larger than the maximum plate thickness of the first and second heating works W1 and W2.
  • the temperature drop of the first and second heating works W1 and W2 is suppressed by the radiant heat from the heat storage material 5 having a relatively large heat capacity. Therefore, the temperature drop of the heated work can be effectively suppressed.
  • FIG. 28 is a top view of the tray 1 as viewed from above.
  • FIG. 29 is a side view of the tray 1 shown in FIG. 28 as viewed from the direction of arrow F.
  • the tray body 2 has a shape extending along a plane perpendicular to the vertical direction, and includes a hollow portion 2G penetrating vertically. When viewed from above, the region of the hollow portion 2G is wider than the region of the constituent members of the tray body 2.
  • the tray 1 has a heat storage material 5 placed on the tray main body 2.
  • the tray 1 has a plurality of columns 3 extending above the heat storage material 5.
  • the tray body 2 has a frame 2c and a bar member 2f spanned inside the frame 2c.
  • the frame 2c includes a pair of vertical frames 2b and a pair of horizontal frames 2a.
  • the pair of vertical frames 2b are arranged in parallel with each other separated in the horizontal direction.
  • the pair of horizontal frames 2a are arranged in parallel with each other in the vertical direction between the pair of vertical frames 2b.
  • the pair of vertical frames 2b and horizontal frames 2a form a rectangular frame 2c when viewed from above.
  • the bar member 2f includes a vertical bar member 2d and a horizontal bar member 2e.
  • the vertical bar member 2d is bridged between the pair of horizontal frames 2a.
  • the horizontal bar member 2e is bridged between the pair of vertical frames 2b.
  • the rod members 2f are arranged in a grid pattern in the frame 2c.
  • the bar member 2f (at least one of the vertical bar member 2d and the horizontal bar member 2e) may be configured so that the position in the frame 2c can be adjusted.
  • the frame 2c may be provided with a plurality of positioning holes or locking pieces.
  • the rod member 2f is fixed to the hole or the locking piece of the frame 2c by using a fastener or the like, if necessary.
  • the position of the rod member 2f in the frame 2c can be adjusted.
  • the configuration of the tray body 2 is not limited to the example shown in FIG. 28.
  • the tray body has a pair of vertical bar members arranged substantially parallel to each other and a plurality of horizontal bar members bridged between the pair of vertical bar members in a direction intersecting the pair of vertical bar members. It may be formed in the shape of a ladder to have. Further, the tray body may be formed of a plate-shaped member having a plurality of holes penetrating vertically as a hollow portion.
  • the constituent members of the tray body 2 may be a pipe material or a solid material. Further, the constituent member of the tray main body 2 may be an angle material having an L-shaped cross section or a channel material having a U-shaped cross section.
  • the material of the constituent members of the tray body 2 is not particularly limited, but is formed of a heat-resistant material such as heat-resistant steel or ceramics. It is desirable that the maximum operating temperature of the constituent members is, for example, in the range of 900 ° C. or higher, which is commonly used in heating devices, and 1050 ° C. or lower, which is the upper limit set temperature of the heating device.
  • heat-resistant steel heat-resistant alloy steel
  • examples of the heat-resistant steel (heat-resistant alloy steel) that can be used as a constituent member include SCH22 (0.4C-25Cr-20Ni) and SCH24 (0.4C-25Cr-35Ni-Mo, Si). If the constituent members of the tray body 2 are made of heat-resistant alloy steel, processing and manufacturing become easy. The material that can be used as the constituent member of the tray body 2 can also be used as the material of the support column 3.
  • the heat storage material 5 is placed on the tray main body 2.
  • the heat storage material 5 is a plate-shaped member.
  • the heat storage material 5 has a rectangular shape when viewed from above.
  • the heat storage material 5 has a through hole for passing the support column 3.
  • the column 3 extends upward through a through hole of the heat storage material 5 placed on the tray body 2.
  • the material of the heat storage material 5 is not particularly limited, but is formed of a heat-resistant material such as a refractory metal or ceramics.
  • a heat-resistant material such as a refractory metal or ceramics.
  • the refractory metal that can be used as the material of the heat storage material 5 include refractory steel, stainless steel, Ni-based alloy and other alloys.
  • the heat storage material 5 preferably has a small thermal conductivity. When the thermal conductivity is small, the temperature is less likely to decrease, and the effect of heat quantity compensation by radiant heat on the first and second heating works W1 and W2 can be maintained for a longer time.
  • the heat storage material 5 may be formed of a material having a thermal conductivity equal to or lower than that of the work to be heated.
  • the thermal conductivity of the heat storage material 5 is not limited to this, but is preferably 200 W / mK or less, more preferably 100 W / mK or less, and even more preferably 70 W / mK or less.
  • the heat storage material 5 and the tray 1 are used in the heating process and the transfer process of another work after the first heating work W1 and the second heating work W2 are lifted by the transfer device 46 and transferred to the press position. You may.
  • the support column 3 is formed so as to extend upward from the tray main body 2 to a position higher than the upper surface of the heat storage material 5.
  • the plurality of columns 3 are arranged so that the virtual straight lines connecting the columns 3 form at least one triangle when viewed from above.
  • the plurality of columns 3 are configured so that the first heating work W1 or the second heating work W2 can be placed on top of each other at intervals from the heat storage material 5.
  • the plurality of columns 3 are all located between the hollow portions 2G of the tray body 2 when viewed from above. That is, the support column 3 is provided on the structural member of the tray main body 2 sandwiched between the hollow portions 2G.
  • the plurality of columns 3 penetrate the heat storage material 5.
  • the heat storage material 5 has through holes for passing a plurality of columns 3.
  • a plurality of columns 3 can be arranged inside the outer edge of the heat storage material 5 when viewed from above.
  • the first heating work W1 can be arranged on the plurality of columns 3 so that the entire first heating work W1 having a smaller area than the heat storage material 5 overlaps with the heat storage material 5 when viewed from above.
  • the heat storage material 5 is a flat plate, but the shape of the heat storage material 5 may be, for example, a shape corresponding to the first heating work W1.
  • the distance between the first heating work W1 and the heat storage material 5 can be made uniform over the entire surface.
  • FIG. 29 shows an example in which the first heating work W1 is arranged, the second heating work W2 can also be arranged in the same manner as the first heating work W1.
  • the minimum plate thickness t1 (mm) of the thinnest portion of the second heating work W2 preferably has the following relationship. As a result, the temperature drop of the first heating work W1 on the tray 1 during transportation is effectively suppressed. Dc ⁇ 120t1
  • the minimum plate thickness t1 (mm) described above and the minimum plate thickness t2 (mm) of the thinnest portion of the heat storage material 5 may have the following relationship. As a result, the temperature drop of the work can be effectively suppressed. 0.8 ⁇ t2 / t1 ⁇ 20
  • the configuration in which the first heating work W1 and the second heating work W2 are placed above the heat storage material 5 is not limited to the above example.
  • the support column group 3 for placing the first heating work W1 and the second heating work W2 may be provided on the heat storage material 5.
  • the support column group 3 may be a part of the heat storage material 5.
  • at least a part of the first heating work W1 and the second heating work W2 may come into contact with the heat storage material 5.
  • the heat storage material 5 may have a convex portion protruding upward.
  • the convex portion can have a shape that can support the first heating work W1 and the second heating work W2.
  • the top surface of the convex portion may be a flat surface. In this case, the top surface is the mounting surface of the first heating work W1 and the second heating work W2. Further, the convex portion may be at least one ridge. Further, the heat storage material 5 may have a shape curved in the vertical direction.
  • a part of the heat storage material 5 may be formed so as to extend upward on the outside of the outer edge of the first heating work W1 and the second heating work W2 when viewed from above.
  • the amount of heat can be supplemented by the radiant heat between the lateral ends of the first heating work W1 and the second heating work W2 and the portion extending upward of the heat storage material 5.
  • a part of the heat storage material 5 extends upward and has at least the same height as the first heating work W1 and the second heating work W2. It may be formed to reach the heat storage.
  • the side of the work is covered with the heat storage material 5. Therefore, the heat retaining effect can be maintained as in the case where the side shielding plate is provided.
  • FIG. 30 is a diagram showing a configuration example of a hot pressing production line 10 when the first and second heating works W1 and W2 are stacked, heated and conveyed using a tray.
  • the hot pressing production line 10 shown in FIG. 30 further includes a tray 1.
  • the tray 1 is a tray on which the first heating work W1 and the second heating work W2 are placed on the heating device 14 and the transfer table 16.
  • the tray 1 has a tray main body 2 and a support column group 3 extending upward from the tray main body 2.
  • the support column group 3 has a first support column group for placing the first heating work W1 and a second support column group for placing the second heating work W2.
  • the first support column group includes at least three columns configured to support the lower surface of the first heating work W1.
  • the second strut group is configured to support the second heating work W2 so that the second heating work W2 is arranged above the first heating work W1 supported by the first strut group. Including stanchions.
  • the first column group is arranged so that the virtual straight lines connecting the columns form at least one triangle when viewed from above.
  • the second strut group is arranged at a position different from that of the first strut group when viewed from above, and is arranged so that virtual straight lines connecting the columns when viewed from above form at least one triangle.
  • the second strut group is higher than the lowest strut group in the first strut group.
  • the first heating work W1 is placed on the first support column group
  • the second heating work W2 is placed on the second support column group, and is overlapped on the first heating work W1. It is heated in the state of being arranged.
  • the first heating work W1 and the second heating work W2 are transferred from the heating device 14 to the lifting position by the transfer device 46 on the transfer table 16 in a state of being placed on the tray 1.
  • the first and second heating works W1 and W2 are in a state of overlapping each other during the period from the heating to being lifted by the transport device 46. Therefore, the temperature drop is alleviated.
  • the first heating work W1 placed in the first support column group and the second heating work W2 placed in the second support column group are the second of the second arm 72 of the transfer device 46, respectively. While being supported by the claw 72b and the first claw 71b of the first arm 71, they may be simultaneously lifted upward and transported by the transfer device 46 to the respective press positions of the press machine 20. At this time, the operation of driving the first arm 71 to arrange the pair of first claws 71b on the lower surface of the second heating work W2 and the operation of driving the second arm 72 to place the pair of second claws 72b on the first heating work.
  • the operation of arranging on the lower surface of W1 may be performed at the same time, or may be performed sequentially.
  • the transfer time can be shortened and the temperature drop can be further reduced.
  • the second heating work W2 placed in the second support column group is lifted upward by the first claw 71b of the first arm 71 of the transport device 46, and then the first heating work W1 placed in the first support column group is placed. May be lifted by the second arm 72 of the transfer device 46 and transferred to the press position of the press machine 20 by the transfer device 46, respectively.
  • the transport device 46 simultaneously or sequentially lifts the first heating work W1 placed on the first support column group and the second heating work W2 placed on the second support column group upward among the support columns 3. At that time, the support group 3 does not become an obstacle.
  • the tray body 2 has a shape that extends vertically in the vertical direction, and may include a hollow portion that penetrates vertically. As a result, in the heating step, the heat from the bottom of the tray body 2 is easily transferred to the first heating work W1 and the second heating work W2.
  • the first support column group and the second support column group may be located between the hollow portions of the tray main body 2 when viewed from above. As a result, the heat from the bottom of the tray main body 2 passes through the hollow portion around the first support column group and the second support column group to the first heating work W1 and the second support column group placed in the first support column group.
  • the second heating work W2 placed makes it easier to transmit.
  • the second column group may include at least three columns that are higher by a certain height ⁇ H with respect to each of at least three columns in the first column group.
  • the second heating work supported by the second support column group can be arranged at a position higher by a certain height ⁇ H than the first heating work supported by the first support column group.
  • FIG. 31 is a top view of the tray 1 as viewed from above.
  • FIG. 32 is a side view of the tray 1 shown in FIG. 31 as viewed from the direction of arrow F.
  • the tray body 2 has a shape extending along a plane perpendicular to the vertical direction, and includes a hollow portion 2G penetrating vertically. When viewed from above, the region of the hollow portion 2G is wider than the region of the constituent members of the tray body 2.
  • the tray 1 has a plurality of columns 3 (3a, 3b) extending upward from the tray body 2.
  • the plurality of columns 3 include a first column group 3a on which the first heating work W1 can be placed, and a second column group 3b on which the second heating work W2 can be placed above the first heating work W1. .. Both the first support column group 3a and the second support column group 3b are located between the hollow portions 2G of the tray main body 2 when viewed from above.
  • the tray main body 2 has a frame 2c and a bar member 2f bridged inside the frame 2c.
  • the frame 2c includes a pair of vertical frames 2b and a pair of horizontal frames 2a.
  • the pair of vertical frames 2b are arranged in parallel with each other separated in the horizontal direction.
  • the pair of horizontal frames 2a are arranged in parallel with each other in the vertical direction between the pair of vertical frames 2b.
  • the pair of vertical frames 2b and horizontal frames 2a form a rectangular frame 2c when viewed from above.
  • the bar member 2f includes a vertical bar member 2d and a horizontal bar member 2e.
  • the vertical bar member 2d is bridged between the pair of horizontal frames 2a.
  • the horizontal bar member 2e is bridged between the pair of vertical frames 2b.
  • the rod members 2f are arranged in a grid pattern in the frame 2c.
  • the bar member 2f (at least one of the vertical bar member 2d and the horizontal bar member 2e) may be configured so that the position in the frame 2c can be adjusted.
  • the frame 2c may be provided with a plurality of positioning holes or locking pieces.
  • the rod member 2f is fixed to the hole or the locking piece of the frame 2c by using a fastener or the like, if necessary.
  • the position of the rod member 2f in the frame 2c can be adjusted.
  • the constituent members of the tray body 2 may be a pipe material or a solid material. Further, the constituent member of the tray main body 2 may be an angle material having an L-shaped cross section or a channel material having a U-shaped cross section.
  • the material of the constituent members of the tray body 2 is not particularly limited, but is formed of a heat-resistant material such as heat-resistant steel or ceramics. It is desirable that the maximum operating temperature of the components is in the range of 900 ° C. or higher, which is commonly used in heating devices, and 1050 ° C. or lower, which is the upper limit set temperature of the heating device.
  • heat-resistant steel heat-resistant alloy steel
  • examples of the heat-resistant steel (heat-resistant alloy steel) that can be used as a constituent member include SCH22 (0.4C-25Cr-20Ni) and SCH24 (0.4C-25Cr-35Ni-Mo, Si). If the constituent members of the tray body 2 are made of heat-resistant alloy steel, processing and manufacturing become easy. The material that can be used as the constituent member of the tray body 2 can also be used as the material of the support column 3.
  • the first column group 3a includes at least three columns in which virtual straight lines connecting the columns form a triangle when viewed from above.
  • the second column group 3b includes at least three columns in which virtual straight lines connecting the columns form a triangle when viewed from above.
  • the second support column group 3b is arranged at a position different from that of the first support column group 3a when viewed from above.
  • the second strut group 3b is higher than the lowest strut of the first strut group 3a.
  • the first support column group 3a can support the first heating work W1.
  • the second support column group 3b can support the second heating work W2 above the first heating work W1 supported by the first support column group 3a.
  • the second support column group 3b is arranged in a region where the second heating work W2 is placed when viewed from above, and does not overlap with the region where the first heating work W1 is placed. Further, the second support column group 3b is configured so as not to overlap with the region where the first heating work W1 is placed when viewed from above. That is, the second support column group 3b is configured so that the first heating work W1 does not get caught in the second support column group 3b when the first heating work W1 is lifted upward by the transport device 46.
  • the number of the first strut group 3a and the second strut group 3b is not particularly limited.
  • the number of the first support column group 3a and the number of the second support column group 3b may be the same or different.
  • the second support column group 3b The number may be larger than the number of the first support column group 3a.
  • the first heating work W1 has a notch at the edge when viewed from above.
  • the second support column group 3b is arranged in the region corresponding to the notch of the first heating work W1. In this way, by arranging the second support column group 3b in the region corresponding to the notch or hole of the first heating work W1, the second support column group 3b is placed in the region that does not overlap with the first heating work W1 when viewed from above. Can be placed.
  • the configurations of the first support column group, the second support column group, and the heated work are not limited to the example shown in FIG. 31.
  • the first heating work W1 and the second heating work W2 having the same shape may be arranged at positions shifted from each other when viewed from above.
  • the first heating work W1 and the second heating work W2 are arranged so that a part of the second heating work W2 does not overlap with the first heating work W1 when viewed from above.
  • the second support column group 3b is arranged at a position in the region where the second heating work W2 is arranged and which does not overlap with the region where the first heating work W1 is arranged.
  • the first heating work W1 may not be provided with a notch, a hole, or the like.
  • Dt ⁇ 100t it is more preferable that Dt ⁇ 100t, and it is further preferable that Dt ⁇ 60t.
  • the interval Dt (mm) is, for example, preferably 100 mm or less, and more preferably 50 m or less.
  • ⁇ H is the difference in height between the first strut group 3a and the second strut group 3b.
  • the range of ⁇ H (mm) can be, for example, the range obtained by adding the maximum plate thickness of the first heating work W1 to the range of the above interval Dt (mm).
  • ⁇ H is preferably 3 to 103 mm, more preferably 3 to 53 mm.
  • the present invention is not limited to the above embodiment.
  • the third arm 73 and the fourth arm 74 may be omitted.
  • the lateral direction in which the pair of first arms 71 are arranged and the lateral direction in which the pair of second arms 72 are arranged are both the same in the x direction.
  • a pair of first arms 71 may be arranged in the x direction
  • a pair of second arms 72 may be arranged in the y direction perpendicular to the x direction.
  • the second arm 72 is longer than the first arm 71, but the first arm 71 may be longer than the second arm 72.
  • the third arm 73 may be longer than the fourth arm 74.
  • a plurality of pairs of the first arm 71 and a plurality of pairs of the second arm 72 are provided.
  • a pair of first arms 71 and a pair of second arms 72 may be provided.
  • the base frame 48 may be stretchable in the lateral direction (at least one of the x direction and the y direction).
  • Example 1 The steel sheet was heated, and the temperature change after the heating was completed was measured under different conditions. Specifically, the following experiment was conducted. As a test material, 1.5 GPa class hot pressing steel plates having a plate thickness of 0.8 mm and 1.6 mm were used, and a thermocouple was attached to the surface of the steel plate to measure the temperature. The steel sheet was heated to 950 ° C. in a heating furnace, and the temperature drop during air cooling after being taken out of the heating furnace was measured. Comparative Example 1 is the condition in which one steel plate having a plate thickness of 1.6 mm is independently heated and allowed to cool, Comparative Example 2 is the condition in which one steel plate having a plate thickness of 0.8 mm is independently heated and allowed to cool, and the plate thickness is 0.
  • the temperature was measured under the condition that two 8 mm steel plates were stacked in the normal direction of the plate surface and fixed side by side at a predetermined interval D. Under the condition that two steel plates were stacked, the intervals D were set to three levels of 10 mm, 30 mm, and 50 mm, and were set to Example 1, Example 2, and Example 3, respectively.
  • FIG. 33 shows the temperature measurement position. The temperatures of the upper and lower steel plates were measured at 5 mm, 20 mm, 30 mm, 50 mm from the edge of the steel plate and at the center position of the steel plate.
  • FIG. 34 is a graph of the average temperature drop rate as a measurement result.
  • the average temperature drop rate in the section from 800 ° C. to 750 ° C. in the measured temperature drop curve was derived.
  • FIG. 35 is a graph showing a range targeted for deriving the average temperature drop rate. From the results shown in FIG. 34, it is a condition in which two steel plates having a thickness of 0.8 mm are stacked one above the other in Comparative Example 1, which is a condition in which one steel plate having a thickness of 0.8 mm is used alone at all measurement positions. It was confirmed that the average temperature lowering rate of Examples 1 to 3 could be reduced.
  • Example 3 in which the interval D is set to 50 mm, it is about halfway between Comparative Example 1 which is a condition of a single steel plate having a plate thickness of 0.8 mm and Comparative Example 2 which is a condition of a single steel plate having a plate thickness of 1.6 mm.
  • the temperature drop rate has improved.
  • Example 1 in which the interval D was set to 10 mm the temperature lowering rate was improved to the same level as in Comparative Example 2 in which one steel plate having a thickness of 1.6 mm was used alone.
  • Example 2 (Experimental Example 2) Next, under the condition that two steel plates having a thickness of 0.8 mm were stacked one above the other, the steel plates were heated to 950 ° C. by a heating device, and the temperature drop when the steel plates were transferred by the transfer device after the heating was completed was measured.
  • the maximum transfer speed by the transfer device was 1.6 m / sec, and the travel distance was about 3.2 m.
  • the temperature drop when the shielding plate was installed in front of and above the transport direction in the transport device was also measured.
  • FIG. 36 shows the configuration of the shielding plate 97 used in the experiment.
  • the shielding plate 97 was installed so that the entire two steel plates M1 and M2 being transported were completely covered when viewed from the front, and the entire steel plates M1 and M2 were also covered when viewed from above.
  • the distance D between the two steel plates M1 and M2 was set to 30 mm.
  • the upper and lower steel plates M1 and M2 were fixed with the connecting material 31 and heated and transported.
  • the condition without the shielding plate was referred to as Example 4, and the condition with the shielding plate was referred to as Example 5.
  • the temperature measurement positions were 5 mm, 30 mm, and 50 mm from the ends of the steel plates M1 and M2.
  • the temperatures of the upper and lower steel plates M1 and M2 were measured by a thermocouple NT.
  • FIG. 37 is a graph of the average temperature drop rate as a measurement result. Since the period during which the steel plate was moved by the transfer device was in the range of about 5 seconds to 8 seconds after leaving the heating furnace, the measured temperature drop curve shows 5 to 8 seconds after leaving the heating furnace. The average temperature drop rate in the interval up to seconds was derived.
  • FIG. 38 is a graph showing a range targeted for deriving the average temperature drop rate. In the result shown in FIG. 37, in Example 4 without the shielding plate, the temperature lowering rate at the end of the steel plate was relatively high. In addition, the temperature of the upper steel plate was higher than that of the lower steel plate. This is the same tendency as the result of Example 2 in which the temperature is measured in a stationary state with the interval D in FIG.
  • Example 5 in which the shielding plates were installed in front of and above the transport direction in the transport device, the temperature lowering speed of the steel plate end and the upper steel plate was greatly improved. In addition, the difference in temperature lowering speed between the plate width direction and the upper and lower steel plates could be greatly reduced.

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PCT/JP2021/030781 2020-08-28 2021-08-23 プレス成形品の製造方法、加熱ワークの搬送装置、及び熱間プレス製造ライン Ceased WO2022045057A1 (ja)

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US18/042,643 US12576443B2 (en) 2020-08-28 2021-08-23 Method of manufacturing press-formed product, apparatus for transporting heated workpiece, and hot-press manufacturing line
CN202180053242.5A CN115989099A (zh) 2020-08-28 2021-08-23 压制成形品的制造方法、加热工件的输送装置和热压生产线
EP21861483.2A EP4205874A4 (en) 2020-08-28 2021-08-23 METHOD FOR MANUFACTURING PRESS-MOLDED ARTICLE, TRANSPORT DEVICE FOR HEATED PART, AND METHOD FOR MANUFACTURING HOT PRESS

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