EP4400226A1 - Production method - Google Patents

Production method Download PDF

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Publication number
EP4400226A1
EP4400226A1 EP22867297.8A EP22867297A EP4400226A1 EP 4400226 A1 EP4400226 A1 EP 4400226A1 EP 22867297 A EP22867297 A EP 22867297A EP 4400226 A1 EP4400226 A1 EP 4400226A1
Authority
EP
European Patent Office
Prior art keywords
box body
conveyance
aluminum alloy
alloy sheet
opening
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.)
Pending
Application number
EP22867297.8A
Other languages
German (de)
English (en)
French (fr)
Inventor
Takahiro Nakagawa
Shun TAKAOKA
Yuuji Yabuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
G Tekt Corp
Original Assignee
G Tekt 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 G Tekt Corp filed Critical G Tekt Corp
Publication of EP4400226A1 publication Critical patent/EP4400226A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D9/0006—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
    • C21D9/0068—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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • 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
    • 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
    • B21D43/20—Storage arrangements; Piling or unpiling
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/06—Charging or discharging machines on travelling carriages

Definitions

  • the present invention relates to a production method for pressing an aluminum alloy sheet.
  • a high-strength metal sheet such as a high-tensile steel sheet or an aluminum alloy sheet is used to reduce the weight.
  • a part of this type is formed by pressing a steel sheet or an aluminum alloy sheet.
  • hot press is used. For example, when hot-pressing a high-tensile steel sheet, the high-tensile steel sheet is heated to 950°C and thus changed to an austenite structure, and in this state, hot press is performed.
  • the high-tensile steel sheet is cooled and thus quenched (changed to a hard structure called a martensite structure), thereby forming a high-strength part (patent literature 1).
  • the high-tensile steel sheet is heated in a heating furnace, a conveyance step of unloading the heated high-tensile steel sheet from the heating furnace and conveying the unloaded high-tensile steel sheet to a press machine is performed, and then, pressing is performed.
  • the conveyance step after the high-tensile steel sheet heated to about 950°C is unloaded from the heating furnace, the unloaded high-tensile steel sheet is conveyed to the press machine. Since the heating temperature is high, temperature drop in the conveyance step poses no problem for the press forming property in the next step.
  • Patent Literature 1 Japanese Patent No. 4094473
  • an aluminum alloy sheet is used for a vehicle body part.
  • the distance between the heating furnace and the press machine may be shortened to shorten the conveyance distance and suppress the heat loss.
  • the present invention has been made to solve the above-described problem, and suppresses a heat loss in conveyance of an aluminum alloy sheet that is a conveyance target.
  • a production method comprising a heating step of heating an aluminum alloy sheet that has undergone a precipitation hardening treatment in advance, to a temperature for enabling press forming in a state in which precipitation hardening is maintained, a conveyance step of storing the heated aluminum alloy sheet in a box body and conveying the aluminum alloy sheet in a state in which heated air is introduced into the box body to suppress temperature drop of the aluminum alloy sheet, and a pressing step of pressing the aluminum alloy sheet conveyed in the conveyance step.
  • the heating step the aluminum alloy sheet that has undergone age hardening is heated within a range from not less than a solid solution start temperature to a hardness lowering temperature
  • the conveyance step the aluminum alloy sheet is conveyed at or above the solid solution start temperature
  • the pressing step the aluminum alloy sheet is pressed at the solid solution start temperature.
  • a conveyance apparatus that executes the conveyance step includes a conveyance mechanism, the box body which is fixed to the conveyance mechanism and stores the aluminum alloy sheet, an unloading/loading mechanism configured to unload the aluminum alloy sheet from the box body and load the aluminum alloy sheet into the box body, and a heating mechanism configured to introduce heated air into the box body to suppress temperature drop of the aluminum alloy sheet.
  • the box body includes a first opening and a second opening provided in a surface facing the first opening
  • the unloading/loading mechanism includes a conveyance arm that is arranged to extend through the box body between the first opening and the second opening, is movable in a penetrating direction to extend through the box body, and comprises a holding unit configured to hold the aluminum alloy sheet, and a first shielding plate and a second shielding plate, which are attached to the conveyance arm across the holding unit to shield the first opening and the second opening in a state in which the holding unit is stored in the box body.
  • an inside of the box body is substantially sealed by shielding the first opening and the second opening with the first shielding plate and the second shielding plate.
  • the first shielding plate is provided in a boundary region between the holding unit and a region other than the holding unit, and comprises an opening/closing mechanism configured to open/close the second shielding plate.
  • the conveyance arm includes two conveyance arms, and each of the two conveyance arms includes in the holding unit a hook that changes to a state in which the aluminum alloy sheet is held and an open state.
  • the box body is formed by a lower box and an upper box, which are connected by a hinge so as to be opened/closed
  • the unloading/loading mechanism includes two conveyance arms that are arranged while extending through the box body from a surface where the hinge is provided, are movable in a penetrating direction to extend through the box body, and can project from an opening/closing portion of the box body, and holding mechanisms provided on the two conveyance arms on a side of the opening/closing portion of the box body and configured to hold the aluminum alloy sheet between the two conveyance arms.
  • the box body includes an opening
  • the unloading/loading mechanism includes two conveyance arms stored in the box body in a state in which the conveyance arms are movable in a direction of discharging from the opening, two rods arranged to extend through the box body on a surface facing the opening and connected to the two conveyance arms to be movable in a direction of inserting/removing the two conveyance arms into/from the box body, a lid provided on the opening of the box body so as to be opened/closed and holding mechanisms that are provided on the two conveyance arms on a side of the opening of the box body and change, between the two conveyance arms, to a state in which the aluminum alloy sheet is held and an open state.
  • an upper surface of the box body opens
  • the unloading/loading mechanism includes a plate that is arranged on a side of the upper surface of the box body, is movable in a direction parallel to a bottom surface of the box body, and can close the upper surface opening of the box body, a first moving mechanism configured to move the plate in the direction parallel to the bottom surface of the box body between a first position and a second position, at which a relative position to the box body is different, a second moving mechanism configured to relatively move the box body and the plate to a state in which the plate closes the upper surface of the box body and an open state in each of a state at the first position and a state at the second position, and a holding mechanism provided on a lower surface of the plate on a side of the box body, which is in a region of the box body in the state at the first position and configured to change to a state in which the aluminum alloy sheet is held and an open state.
  • the box body has a double structure.
  • the box body includes an exhaust port configured to exhaust air introduced by the heating mechanism.
  • the conveyance apparatus further includes a cool air supply mechanism configured to mix cooled air with the air discharged from the exhaust port.
  • the conveyance apparatus further includes a slow cooling box provided in a lower portion of the box body, and the cool air supply mechanism is provided in the slow cooling box.
  • the conveyance apparatus includes a thermometer configured to measure a temperature in the box body, and a controller configured to control the heating mechanism based on a measurement result of the thermometer.
  • an aluminum alloy sheet is stored in a box body heated to a predetermined temperature by a heating mechanism and conveyed, a heat loss in conveyance of the aluminum alloy sheet that is a conveyance target can be suppressed.
  • the production method is a production method of pressing an aluminum alloy sheet that has undergone a precipitation hardening treatment in advance, and includes a heating step S101, a conveyance step S102, and a pressing step S103.
  • an aluminum alloy sheet that has undergone a precipitation hardening treatment in advance is heated to a temperature for enabling press forming in a state in which the precipitation hardening is maintained.
  • an aluminum alloy sheet that has undergone age hardening is heated within the range from not less than a solid solution start temperature to a hardness lowering temperature.
  • an A7075 plate material (aluminum alloy sheet) formed by performing the precipitation hardening treatment to a T6 material or a T7 material is heated in a state in which the state of precipitation hardening treatment is maintained.
  • the aluminum alloy sheet is heated, for 3 to 70 sec, to any temperature within the range of 200°C to 250°C at which the aluminum alloy sheet can be press-formed.
  • the heated aluminum alloy sheet is stored in the box body of the above-described conveyance apparatus and conveyed in a state in which temperature drop of the conveyance apparatus is suppressed by introducing heated air into the box body.
  • the aluminum alloy sheet is conveyed at or above the solid solution start temperature.
  • the aluminum alloy sheet conveyed in the conveyance step S102 is pressed.
  • the aluminum alloy sheet is pressed at the solid solution start temperature.
  • an aluminum alloy sheet made of an aluminum alloy and having undergone the precipitation hardening treatment which is manufactured by a plate material manufacturer, is heated in a state in which the state of precipitation hardening is maintained, and pressed while maintaining the state of precipitation hardening, the age hardening treatment is unnecessary after pressing in a parts manufacturer (car manufacturer).
  • Age hardening of a pressed product requires a large heating facility and takes long time, and it is not suitable for the production speed of automobiles.
  • the age hardening treatment is unnecessary after pressing, as described above, the aluminum alloy that has undergone age hardening can be formed at low cost and high productivity in the parts manufacturer (car manufacturer).
  • the heating step if the heated aluminum alloy sheet is simply conveyed to the press machine in the pressing step, the aluminum alloy sheet is cooled by air during this time and cannot therefore bend in the pressing step, and cracks may occur. If the heating temperature in the heating step is raised in anticipation of temperature drop of the aluminum alloy sheet due to air, the aluminum alloy sheet softens, and the hardness of the pressed product decreases in aging treatment of the T6 material or T7 material. For this reason, it is not preferable to raise the heating temperature in the heating step in anticipation of temperature drop. Note that this is more unpreferable for the T7 material because decrease of hardness is more conspicuous in the T7 material than in the T6 material.
  • the heating step is performed at a maximum temperature of 255°C for a heating time of 45 sec, the hardness of a pressed product after pressing is 137 HV. If the heating step is performed at a maximum temperature of 230°C for a heating time of 45 sec, the hardness of a pressed product after pressing is 151 HV. If the heating step is performed at a maximum temperature of 225°C for a heating time of 25 sec, the hardness of a pressed product after pressing is 155 HV. If the heating step is performed at a maximum temperature of 195°C for a heating time of 30 sec, the hardness of a pressed product after pressing is 156 HV. If the heating step is performed at a maximum temperature of 195°C for a heating time of 10 sec, the hardness of a pressed product after pressing is 154 HV.
  • the heating step is performed under a high temperature condition, pressing can easily be performed, but the hardness of the pressed product is low. Since a general management value of the hardness of the pressed product is 150 HV, in the above-described experiment result, the temperature of 255°C of the aluminum alloy sheet in the heating step is a condition that a pressed product complying with the product standard (management value) cannot be manufactured.
  • the unloaded aluminum alloy sheet is conveyed to the press machine. Since the temperature of the aluminum alloy sheet lowers during the conveyance, it is very important to suppress temperature drop of the aluminum alloy sheet at the time of conveyance. On the other hand, if the temperature in the heating step is made high in consideration of temperature drop during the conveyance, the hardness of a pressed product lowers, as is apparent from the above-described experiment result. For this reason, conveying the aluminum alloy sheet using the above-described conveyance apparatus while suppressing temperature drop is very effective in suppressing occurrence of a problem as described above. In particular, the T7 material is effective.
  • the conveyance apparatus includes a conveyance mechanism 101, and a box body 102 fixed to the conveyance mechanism 101.
  • the conveyance mechanism 101 can be formed by a self-propelled vehicle driven by a motor or the like.
  • the conveyance mechanism 101 can also be formed by, for example, a 6-axial robot.
  • the conveyance mechanism 101 can also be formed by a crane or a cylinder.
  • the conveyance mechanism 101 can also be formed by a conveyance loader.
  • the box body 102 is a portion that stores an aluminum alloy sheet that is a conveyance object as a conveyance target, and includes, in Example 1, a first opening 103 and a second opening 104 provided in a surface facing the first opening 103.
  • the box body 102 can be formed by an outer box 102a and an inner box 102b to have a double structure.
  • the box body 102 (the outer box 102a and the inner box 102b) can be made of, for example, stainless steel or an aluminum alloy.
  • the box body 102 (the outer box 102a and the inner box 102b) can also be made of ceramic.
  • the conveyance apparatus includes an unloading/loading mechanism that unloads the aluminum alloy sheet that is the conveyance object from the box body 102 and loads it into the box body 102.
  • the unloading/loading mechanism includes two conveyance arms 105.
  • the two conveyance arms 105 are arranged to extend through the box body 102 between the first opening 103 and the second opening 104.
  • the two conveyance arms 105 are movable in a penetrating direction to extend through the box body 102, and includes a holding unit 121 that holds the aluminum alloy sheet as the conveyance target.
  • the conveyance arms 105 can be made of, for example, stainless steel.
  • the conveyance arms 105 are slidable on the contact surfaces to the first opening 103 and the second opening 104. If a plurality of aluminum alloy sheets exist, the two conveyance arms 105 can include a plurality of sets.
  • the conveyance arms 105 includes hooks 109 configured to hold the aluminum alloy sheet in the holding unit 121.
  • the aluminum alloy sheet is, for example, a plate-shaped member having a rectangular shape whose sides have a length of 2,000 mm at maximum in a planar view.
  • the hooks 109 are provided at the four corners of a rectangular region in a planar view sandwiched between the two conveyance arms 105.
  • a support structure (not shown) configured to hold the aluminum alloy sheet can be provided at the center between the two conveyance arms 105.
  • the hooks 109 and the support structure can appropriately be provided in accordance with the size of the aluminum alloy sheet.
  • the hooks 109 and the support structure can be detachable from the conveyance arms 105.
  • first shielding plate 106 and a second shielding plate 107 are attached to the conveyance arms 105 across the holding unit 121.
  • the first shielding plate 106 is provided in a boundary region between the holding unit 121 and a region other than the holding unit 121.
  • the second shielding plate 107 is provided at the distal end of the holding unit 121 in a direction of discharging the holding unit 121 from the box body 102.
  • the first shielding plate 106 and the second shielding plate 107 can each be made of fluororubber, alumina-based ceramic, silica-based ceramic, zirconia-based ceramic, alumina refractory brick, chamotte pottery, or the like.
  • the first opening 103 and the second opening 104 can be shielded in a state in which the holding unit 121 is stored in the box body 102.
  • the first shielding plate 106 and the second shielding plate 107 can each include an opening/closing mechanism. The first shielding plate 106 and the second shielding plate 107 can be detachable together with the two conveyance arms 105.
  • the conveyance arms 105 are provided with a third shielding plate 110.
  • the second shielding plate 107 and the third shielding plate 110 are arranged to be line-symmetrical across the first shielding plate 106.
  • an aluminum alloy sheet 151 heated in a heating furnace can be held on the holding unit 121 in the heating furnace.
  • the second shielding plate 107 is slid up to open by the opening/closing mechanism provided in the second shielding plate 107.
  • the two conveyance arms 105 are inserted into the heating furnace.
  • the third shielding plate 110 and the first shielding plate 106 shield the first opening 103 and the second opening 104, and the inside of the box body 102 (inner box 102b) is substantially sealed.
  • the aluminum alloy sheet 151 is held on rods or the like.
  • the aluminum alloy sheet 151 on the rods is taken from the portion where the second shielding plate 107 is open to the holding unit 121 between the two conveyance arms 105.
  • the rods are lowered in this state, thereby placing the aluminum alloy sheet 151 on the hooks 109.
  • the second shielding plate 107 is slid down and closed.
  • the conveyance apparatus can include a mechanism that changes the hooks 109 provided on the two conveyance arms 105 of the holding unit 121 to a state in which the aluminum alloy sheet 151 is held and an open state. For example, in the heating furnace, the rods that hold the aluminum alloy sheet 151 are lowered, and in this state, the two conveyance arms 105 are inserted into the heating furnace. At this time, the aluminum alloy sheet 151 is arranged on the lower side of the holding unit 121 of the two conveyance arms 105. Next, the hooks 109 are set in the open state, and the rods are lifted to take the aluminum alloy sheet 151 to the holding unit 121. After that, the hooks 109 are set in a holding state, and the rods are lowered, thereby placing the aluminum alloy sheet 151 on the hooks 109 in the holding state.
  • the aluminum alloy sheet 151 held by the holding unit is stored in the box body 102 (inner box 102b) together with the holding unit 121.
  • the second shielding plate 107 and the first shielding plate 106 shield the first opening 103 and the second opening 104, and the inside of the box body 102 (inner box 102b) is substantially sealed.
  • the conveyance apparatus includes a heating mechanism (heat retaining mechanism) 108 that introduces heated air into the box body 102 (inner box 102b) to suppress temperature drop of the stored aluminum alloy sheet.
  • the heating mechanism 108 introduces air (hot air or warm air) heated (warmed) by the heating mechanism 108 into the box body 102, thereby heating the inside of the box body 102 (retaining heat).
  • the heating mechanism 108 can be formed by, for example, "hot air heater QA type (QAO-135)" available from Nippon Heater. This can compress air outside the box body and make the air flow into an electric heater to generate heated air at a constant temperature and a constant flow rate.
  • the heat retaining property in the internal space can be increased. Also, when the box body 102 has the double structure, in a state in which the inside of the inner box 102b is heated, the surface of the outer box 102a can keep a low-temperature state, and safety in the production site can be kept.
  • the box body 102 can include, at the center, an exhaust port 111 that exhausts the air (hot air or warm air) introduced along a side wall of the inner box 102b (heat retaining chamber or heating chamber) by the heating mechanism 108.
  • the heated air spirally flows in the heat retaining chamber (inner box 102b), and is discharged from the exhaust port 111 to a cooling chamber (slow cooling box 112) below.
  • the cooling chamber (slow cooling box 112) can further include a cool air supply mechanism that mixes cooled air (cold air or cool air) with the air (hot air or warm air) discharged from the exhaust port 111.
  • the cool air supply mechanism can be provided in the slow cooling box 112 provided in the lower portion of the box body 102. Note that Fig. 5A shows a cross section taken along a line a - a' in Fig. 5B .
  • the cool air supply mechanism includes a blower 113 extending through the box body, and a channel 114 that guides to the outlet of the exhaust port 111.
  • warm air (heated air) supplied from the heating mechanism 108 flows in from a corner in the box body 102 along the wall surface, spirally circulates in the box body 102 (heat retaining chamber or heating chamber), evenly heats the aluminum alloy sheet held by the holding unit 121, and is exhausted from the exhaust port 111 arranged at the center to the cooling chamber (slow cooling box 112).
  • Cool air supplied from the blower 113 is transported via a channel 114 provided in the slow cooling box 112 using a guide or pipe having an L shape in a planar view, and mixed with the warm air discharged from the exhaust port 111 at the center to the cooling box 112.
  • the discharge air slowly cooled by mixing the cool air is distributed to the left and right sides on the wall surface facing the channel 114, and discharged to the outside from a pair of left and right discharge ports 115 provided in the bottom portion of the slow cooling box 112.
  • the discharge ports 115 can be arranged at positions different from the exhaust port 111 in a planar view.
  • the discharge ports 115 can be provided at a plurality of points on the wall surface sides from the central portion of the bottom portion of the slow cooling box 112 (on the outer sides from the channel 114).
  • a check valve 116 is provided, thereby forming a structure that prevents air (cooled air) from flowing back from the exhaust port 111 into the box body 102.
  • a silencer can be provided in each discharge port 115.
  • the conveyance apparatus can also include a thermometer 131 that measures the temperature in the box body 102, and a controller 132 that controls the heating mechanism 108 based on measurement result of the thermometer 131.
  • the thermometer 131 is arranged, in the box body 102, at a point not to disturb the loading/unloading operation of the aluminum alloy sheet by the conveyance arms 105.
  • the thermometer 131 can be provided, for example, on the bottom surface or the ceiling surface in the inner box 102b.
  • the thermometer 131 can be provided on the bottom surface or the ceiling surface in the inner box 102b in a region substantially corresponding to the central portion of the aluminum alloy sheet stored in the box body 102. With this configuration, the temperature in the box body 102 near the stored aluminum alloy sheet can be measured.
  • the thermometer 131 can be formed by, for example, a thermocouple.
  • the controller 132 controls the operation of the heating mechanism 108 such that the measurement result of the thermometer reaches a set target temperature. For example, the correlation between the temperature measurement result of the thermometer 131 and the temperature of a stored aluminum alloy sheet is obtained by experiments or the like, and the result is reflected on control by the controller 132, thereby enabling more accurate temperature control.
  • the conveyance apparatus first, in the first state shown in Fig. 4A , the aluminum alloy sheet 151 is held (loaded) on the holding unit 121.
  • the second state shown in Fig. 4B is set, and the holding unit 121 holding the aluminum alloy sheet 151 is stored in the box body 102 (inner box 102b) set to a predetermined temperature by the heating mechanism 108.
  • the conveyance mechanism 101 is operated to convey the aluminum alloy sheet 151 to a predetermined point (for example, a press machine).
  • the first state shown in Fig. 4A is set to allow the aluminum alloy sheet 151 to be extracted (unloaded) from the holding unit 121.
  • the inside of the box body 102 in which heat is retained (heated) at a predetermined temperature by the heating mechanism 108 is substantially sealed in both the first state shown in Fig. 4A and the second state shown in Fig. 4B .
  • a temperature variation in the box body 102 can be suppressed.
  • the heating mechanism 108 is controlled by a control system formed by the thermometer 131 and the controller 132, a temperature change in the box body 102 during conveyance can be substantially eliminated.
  • heated air is introduced into the box body by the heating mechanism 108 to suppress temperature drop of the aluminum alloy sheet, even if a heat loss occurs due to opening/closing of the shielding plates or a non-sealed state of the box body, heated air including the heat loss amount is replenished, and therefore, a temperature variation in the box body 102 can be suppressed.
  • the press target plate material is heated in a heating furnace to an upper limit temperature of about 200°C to 250°C at which the hardness does not lower, extracted from the heating furnace, conveyed to a press machine in a state in which the plate material is in contact with ambient air, and press-formed. If the conveyance takes, for example, 20 sec, the temperature lowers by about 10°C to 15°C. If the temperature is lower than 200°C at which formation is possible, the press condition is not satisfied, and a formation failure occurs due to cracks, or the like.
  • the box body need only have a size to store the aluminum alloy sheet. It is possible to reduce the heating energy of the heating mechanism, make the conveyance mechanism small, and maintain the temperature in the box body without increasing the cost.
  • the conveyance apparatus includes a conveyance mechanism (not shown), and a box body 202 fixed to the conveyance mechanism.
  • the conveyance mechanism is the same as in Example 1 described above and, for example, the box body 202 is fixed on the conveyance mechanism (not shown).
  • the conveyance apparatus includes a heating mechanism (not shown) that introduces heated air into the box body 202 to suppress temperature drop of an aluminum alloy sheet.
  • the heating mechanism introduces air (hot air or warm air) heated (warmed) by the heating mechanism into the box body 202, thereby heating the inside of the box body 202 (retaining heat).
  • the box body 202 is formed by a lower box 202a and an upper box 202b, which are connected by a hinge 203 so as to be opened/closed.
  • the box body 202 has a double structure, and includes an inner lower box 206a and an inner upper box 206b inside the lower box 202a and the upper box 202b.
  • the conveyance apparatus includes two conveyance arms 204 that are movable in a penetrating direction to extend through the box body 202.
  • Fig. 6A schematically shows a cross section parallel to a direction in which the two conveyance arms 204 extend
  • Fig. 6B schematically shows a cross section perpendicular to the direction in which the two conveyance arms 204 extend.
  • the two conveyance arms 204 are arranged while extending through the box body 202 from a surface where the hinge 203 is provided, and can project from the opening/closing portion of the box body 202.
  • the two conveyance arms 204 include holding mechanisms 205 configured to hold an aluminum alloy sheet 251 between the two conveyance arms 204.
  • the holding mechanism 205 can be, for example, a clamp.
  • the two conveyance arms 204 and the holding mechanisms 205 form an unloading/loading mechanism.
  • the two conveyance arms 204 are slid in the direction of the opening/closing portion of the box body 202, and the two conveyance arms 204 are discharged from the opening/closing portion fop the box body 202, as shown in Fig. 7B .
  • the holding mechanisms 205 can hold the aluminum alloy sheet 251.
  • the aluminum alloy sheet 251 heated in a heating furnace (not shown) can be held by the holding mechanisms 205 in the heating furnace.
  • the two conveyance arms 204 are inserted into the heating furnace.
  • the aluminum alloy sheet 251 is held on rods (not shown) or the like.
  • the aluminum alloy sheet 251 on the rods is arranged between the two conveyance arms 204 inserted, thereby holding the aluminum alloy sheet 251 by the holding mechanisms 205.
  • the two conveyance arms 204 are slid to the side of the hinge 203, as shown in Fig. 7C , thereby unloading the aluminum alloy sheet 251 held by the holding mechanisms 205 from the heating furnace and loading it into the box body 202.
  • the aluminum alloy sheet 251 can be stored, as shown in Fig. 7D .
  • the conveyance mechanism (not shown) is operated to convey the aluminum alloy sheet 251 to, for example, a press machine.
  • the same procedures as in the setting of the open state of the lower box 202a and the upper box 202b and the sliding operation of the two conveyance arms 204 described with reference to Figs. 7A and 7B are performed, thereby loading the aluminum alloy sheet 251 held by the holding mechanisms 205 into the press machine.
  • the conveyance apparatus since the aluminum alloy sheet 251 is stored in the box body 202 set at a predetermined temperature during the conveyance, a heat loss can be suppressed.
  • the conveyance apparatus includes a conveyance mechanism (not shown), and a box body 302 fixed to the conveyance mechanism.
  • the conveyance mechanism is the same as in Examples 1 and 2 described above and, for example, the box body 302 is fixed on the conveyance mechanism (not shown).
  • the conveyance apparatus includes a heating mechanism (not shown) that introduces heated air into the box body 302 to suppress temperature drop of an aluminum alloy sheet.
  • the heating mechanism introduces air (hot air or warm air) heated (warmed) by the heating mechanism into the box body 302, thereby heating the inside of the box body 302 (retaining heat).
  • the box body 302 includes an opening 303.
  • the box body 302 has a double structure, and includes an outer box 302a and an inner box 302b.
  • the conveyance apparatus also includes two conveyance arms 304 stored in the box body 302 in a state in which the conveyance arms 304 are movable in a direction to discharge from the opening 303.
  • Fig. 8A schematically shows a cross section parallel to a direction in which the two conveyance arms 304 extend
  • Fig. 8B schematically shows a cross section perpendicular to the direction in which the two conveyance arms 304 extend.
  • the conveyance apparatus also includes two rods 305 arranged to extend through the box body 302 on a surface facing the opening 303 and connected to the two conveyance arms 304 to be movable in a direction of inserting/removing the two conveyance arms 304 into/from the box body 302.
  • the two conveyance arms 304 and the two rods 305 form an unloading/loading mechanism.
  • the two conveyance arms 304 on the side of the opening 303 of the box body 302 include holding mechanisms 307.
  • the holding mechanisms 307 change, between the two conveyance arms 304, to a state in which an aluminum alloy sheet 351 is held and an open state.
  • the opening 303 of the box body 302 is provided with a lid 306 that can be opened/closed.
  • a wire 309 is connected to a wire fixing portion 308 fixed to the lid 306.
  • the wire 309 is wound on a fixed pulley 310 and connected to a wire winding mechanism (not shown).
  • the wire 309 is wound by the wire winding mechanism (not shown), thereby setting the lid 306 in the open state, as shown in Fig. 9A . In this state, the two rods 305 are pushed out by a moving mechanism (not shown), thereby discharging the two conveyance arms 304 from the box body 302.
  • the holding mechanisms 307 can hold the aluminum alloy sheet 351, as will be described later.
  • the two conveyance arms 304 are inserted into a heating furnace.
  • the aluminum alloy sheet 351 is held on rods 311, as shown in Fig. 9C .
  • the aluminum alloy sheet 351 on the rods 311 is arranged between the two conveyance arms 304 inserted and, for example, the rods 311 are lowered, thereby holding the aluminum alloy sheet 351 by the holding mechanisms 307, as shown in Figs. 9D and 9E .
  • the two rods 305 are pulled back by the moving mechanism (not shown), thereby pulling back the two conveyance arms 304 into the box body 302 (inner box 302b).
  • the wire 309 is wound by the wire winding mechanism (not shown), thereby closing the lid 306, as shown in Fig. 9F . This makes it possible to unload the aluminum alloy sheet 351 held by the holding mechanisms 307 from the heating furnace, load it into the box body 302 (inner box 302b), and store the aluminum alloy sheet 351 in the box body 302.
  • the conveyance mechanism (not shown) is operated to convey the aluminum alloy sheet 351 to, for example, a press machine.
  • the same procedures as in the opening operation of the lid 306 and the sliding operation of the two conveyance arms 304 described with reference to Figs. 9A and 9B are performed, thereby loading the aluminum alloy sheet 351 held by the holding mechanisms 307 into the press machine.
  • the conveyance apparatus since the aluminum alloy sheet 351 is stored in the box body 302 set at a predetermined temperature during the conveyance, a heat loss can be suppressed.
  • the conveyance apparatus includes a conveyance mechanism (not shown), and a box body 402 fixed to the conveyance mechanism.
  • the conveyance mechanism is the same as in Examples 1, 2, and 3 described above and, for example, the box body 402 is fixed on the conveyance mechanism (not shown).
  • an upper surface of the box body 402 opens.
  • the box body 402 has a double structure, and includes an outer box 402a and an inner box 402b.
  • a plate 403 is arranged on the upper surface side of the box body 402.
  • the plate 403 is movable in a direction parallel to the bottom surface of the box body 402 and can close the upper surface opening of the box body 402, and thus functions as a lid that closes the opening of the upper surface of the box body 402.
  • Fig. 10A schematically shows a cross section parallel to the moving direction of the plate 403 parallel to the bottom surface of the box body 402
  • Fig. 10B schematically shows a cross section perpendicular to the moving direction of the plate 403 parallel to the bottom surface of the box body 402.
  • the plate 403 can be moved by a first moving mechanism (not shown) in the direction parallel to the bottom surface of the box body 402 between a first position and a second position, at which the relative position to the box body 402 is different. Also, the box body 402 and the plate 403 can be moved relatively by a second moving mechanism (not shown) to a state in which the plate 403 closes the upper surface of the box body 402 and an open state in each of the state at the first position and the state at the second position described above.
  • the conveyance apparatus includes holding mechanisms 404 on the lower surface of the plate 403 on the side of the box body 402, which is in the region of the box body 402 in the state at the first position.
  • the holding mechanisms 404 change to a state in which an aluminum alloy sheet is held and an open state.
  • the holding mechanisms 404 each include, for example, a hook 405.
  • the conveyance apparatus includes a heating mechanism (not shown) that introduces heated air into the box body 402 to suppress temperature drop of an aluminum alloy sheet.
  • the heating mechanism introduces air (hot air or warm air) heated (warmed) by the heating mechanism into the box body 402, thereby heating the inside of the box body 402 (retaining heat).
  • the plate 403 is raised and separated from the upper surface of the box body 402 by the second moving mechanism (not shown), thereby opening the box body 402.
  • the plate 403 is moved in the direction parallel to the bottom surface of the box body 402 by the first moving mechanism (not shown), and the plate 403 is lowered and brought into contact with the upper surface of the box body 402 by the second moving mechanism (not shown).
  • the region of the plate 403 where the holding mechanisms 404 are provided is arranged outside the box body 402.
  • the region of the plate 403 where the holding mechanisms 404 are provided is inserted into a heating furnace.
  • an aluminum alloy sheet 451 is held on rods (not shown), as shown in Fig. 11C .
  • the aluminum alloy sheet 451 on the rods is arranged on the lower side of the inserted region of the plate 403 where the holding mechanisms 404 are provided, and the holding mechanisms 404 are opened.
  • the holding mechanisms 404 are opened, the box body 402 and the plate 403 are lowered by, for example, the conveyance mechanism, the holding mechanisms 404 are arranged on both sides of the aluminum alloy sheet 451, and the aluminum alloy sheet 451 is held by the holding mechanisms 404, as shown in Figs. 11D and 11E .
  • the plate 403 is raised and separated from the upper surface of the box body 402 by the second moving mechanism (not shown) ( Fig. 11F ).
  • the plate 403 is moved in the direction parallel to the bottom surface of the box body 402 by the first moving mechanism (not shown), thereby moving the region of the plate 403 where the holding mechanisms 404 are provided to the upper side of the box body 402 ( Fig. 11G ).
  • the plate 403 is lowered and brought into contact with the upper surface of the box body 402 by the second moving mechanism (not shown). Accordingly, as shown in Fig. 11H , the aluminum alloy sheet 451 held by the holding mechanisms 404 can be unloaded from the heating furnace and loaded into the box body 402 (inner box 402b), and the aluminum alloy sheet 451 can be stored in the box body 402.
  • the conveyance mechanism (not shown) is operated to convey the aluminum alloy sheet 451 to, for example, a press machine.
  • the same procedures as in the rising operation and the sliding operation of the lid 306 described with reference to Figs. 11A and 11B are performed, thereby loading the aluminum alloy sheet 451 held by the holding mechanisms 404 into the press machine.
  • the conveyance apparatus since the aluminum alloy sheet 451 is stored in the box body 402 set at a predetermined temperature during the conveyance, a heat loss can be suppressed.
  • a contact heating furnace can be used.
  • the contact heating furnace has high heat uniformity and can easily handle blank shapes in various sizes. Since the facility is simple, mass productivity can be obtained.
  • the contact heating furnace is suitable for heating an aluminum alloy sheet that has undergone age hardening to a press forming temperature without lowering the hardness.
  • a plurality of box bodies and a plurality of heating furnaces can be aligned in parallel and arranged.
  • the press time is shorter than the heating time (in the examples, the heating time is 60 sec, and the bottom dead center holding time is 10 sec). For this reason, if a plurality of apparatuses that take time are prepared, the production speed can be improved in total. Since the apparatuses are aligned in parallel, the space efficiency can be increased, and rationalization of conveyance is possible.
  • the aluminum alloy sheet is stored in the box body set at a predetermined temperature by the heating mechanism and conveyed, a heat loss in the conveyance of the aluminum alloy sheet as the conveyance target can be suppressed.
  • the aluminum alloy sheet that has undergone a precipitation hardening treatment to increase the strength/hardness in advance can be hot-pressed without lowering its strength/hardness.
  • the productivity does not lower.
  • the conveyance step in which the heated aluminum alloy sheet is stored in the box body and conveyed in a state in which heated air is introduced into the box body to suppress temperature drop of the aluminum alloy sheet, temperature drop during the conveyance can be suppressed even if the heating temperature in the heating step that is a preprocess falls within a narrow temperature range (200°C to 250°C in a 7000-based T7 process) from an upper limit temperature at which the hardness does not lower to a lower limit temperature at which press forming is possible. Hence, in the pressing step that is the next process, press forming can be performed without lowering the hardness.
  • the precipitation hardening treatment is performed in advance for the material before the heating step, the artificial age hardening treatment in the pressing site is unnecessary, and a lightweight vehicle body part having a high hardness (strength) can be obtained without a decrease of the production speed.
  • heated air is introduced into the box body, a heat loss caused by inserting/removing the aluminum alloy sheet into/from the box body can be compensated for, and the temperature can be controlled to a constant temperature.
  • a conveyance apparatus that executes the conveyance step includes:
  • an inside of the box body is substantially sealed by shielding the first opening and the second opening with the first shielding plate and the second shielding plate.
  • the first shielding plate is provided in a boundary region between the holding unit and a region other than the holding unit, and comprises an opening/closing mechanism configured to open/close the second shielding plate.
  • the conveyance arm includes two conveyance arms, and each of the two conveyance arms includes in the holding unit a hook that changes to a state in which the aluminum alloy sheet is held and an open state.
  • the box body has a double structure.
  • the box body includes an exhaust port configured to exhaust air introduced by the heating mechanism.
  • the conveyance apparatus further includes a cool air supply mechanism configured to mix cooled air with the air discharged from the exhaust port.
  • the conveyance apparatus further includes a slow cooling box provided in a lower portion of the box body, and the cool air supply mechanism is provided in the slow cooling box.
  • the conveyance apparatus includes:

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP22867297.8A 2021-09-07 2022-09-02 Production method Pending EP4400226A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021145277 2021-09-07
PCT/JP2022/033104 WO2023037975A1 (ja) 2021-09-07 2022-09-02 生産方法

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EP4400226A1 true EP4400226A1 (en) 2024-07-17

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JP3742596B2 (ja) * 2002-01-23 2006-02-08 日鉄鋼板株式会社 溶融亜鉛−アルミ合金メッキ鋼板の製造方法
JP4094473B2 (ja) 2003-04-18 2008-06-04 新日本製鐵株式会社 高温成形後硬化能に優れた熱間成形加工用鋼板およびその使用方法
JP4673656B2 (ja) * 2005-04-11 2011-04-20 新日本製鐵株式会社 熱間プレス成形装置
JP5201003B2 (ja) * 2008-04-30 2013-06-05 新日鐵住金株式会社 熱間プレス成形用鋼板の加熱装置及び加熱方法
JP6262959B2 (ja) * 2013-08-23 2018-01-17 川崎重工業株式会社 アルミニウム合金部品の製造方法およびアルミニウム合金板のプレス成形装置
JP2015080796A (ja) * 2013-10-22 2015-04-27 ダイハツ工業株式会社 熱間プレス成形設備
JP2016059926A (ja) * 2014-09-16 2016-04-25 ダイハツ工業株式会社 熱間プレス加工用板金材の搬送装置
JP7225892B2 (ja) * 2019-02-18 2023-02-21 日本製鉄株式会社 トレイ及び熱間プレスライン
JPWO2022045069A1 (enrdf_load_stackoverflow) * 2020-08-28 2022-03-03
JP7117364B2 (ja) * 2020-12-25 2022-08-12 株式会社ジーテクト アルミニウム合金の成形方法

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