US20110303330A1 - Steel sheet heating device, method for producing press-formed part, and press-formed part - Google Patents

Steel sheet heating device, method for producing press-formed part, and press-formed part Download PDF

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US20110303330A1
US20110303330A1 US13/067,568 US201113067568A US2011303330A1 US 20110303330 A1 US20110303330 A1 US 20110303330A1 US 201113067568 A US201113067568 A US 201113067568A US 2011303330 A1 US2011303330 A1 US 2011303330A1
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Prior art keywords
heating
steel sheet
hot
heated
press
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Inventor
Masanobu Ichikawa
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Toyoda Iron Works Co Ltd
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Toyoda Iron Works Co Ltd
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Assigned to TOYODA IRON WORKS CO., LTD. reassignment TOYODA IRON WORKS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ICHIKAWA, MASANOBU
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    • 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
    • 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
    • C21D2221/00—Treating localised areas of an article

Definitions

  • the invention relates generally to a steel sheet heating device, a method for producing a press-formed part, and a press-formed part, and more specifically to a technique for producing a press-formed part which is made of a single steel sheet and in which the tensile strength varies at different portions.
  • a center pillar is reinforced by fitting a reinforcement member (reinforcement) inside the center pillar that has a closed cross-section defined by an outer center pillar and an inner center pillar, and then integrally fixing the reinforcement member to the center pillar by welding.
  • a press-formed part is widely used as the reinforcement member for the center pillar.
  • the press-formed part is configured to have the tensile strength that varies at different portions, in order to improve impact energy absorption performance, facilitate partial forming of the reinforcement member, and reduce the weight of the reinforcement member.
  • Japanese Patent Application Publication No. 2000-177630 JP 2000-177630 A describes an example of the reinforcement member.
  • JP 2000-177630 A a plurality of steel sheets that differ in sheet thickness are integrally welded together and subsequently formed into a predetermined shape by press-forming, whereby a reinforcement member is produced. Also, it is possible to produce a press-formed part in which the tensile strength varies at different portions, as taught in Japanese Patent Application Publication No. 2009-95869 (JP 2009-95869 A). According to JP 2009-95869 A, when a steel sheet is pressed into shapes through hot press-forming, the temperature to which the steel sheet is heated is varied at different portions and only part of the steel sheet is quench-hardened. Thus, it is possible to make the tensile strength vary at different portions of the press-formed part.
  • JP 2000-177630 A the plurality of steel sheets that differ in sheet thickness need to be integrally welded together. Therefore, the number of production processes increases, which may increase the production costs. Further, the press-formability in pressing may be reduced due to the variation in sheet thickness of the steel sheets.
  • JP 2009-95869 A a portion to be provided with a high strength is heated by first heating means, and the overall steel sheet is subsequently heated by second heating means. Thus, only the portion to be provided with a high strength is heated to a temperature suitable for quenching. Accordingly, the heating work is cumbersome and time-consuming, which may increase the production costs, and controlling the temperature of the steel sheet may be difficult. In addition, the temperature to which the steel sheet is heated is varied in only two levels.
  • the invention is made in the light of the above-described circumstances, and it is an object of the invention to make it possible, when a steel sheet is heated to different temperatures at various portions as described in JP 2009-95869 A, to heat the steel sheet to different temperatures at various portions at the same time, through a single heating treatment. It is another object of the invention to easily form a prescribed press-formed part while further improving various performances of the press-formed part, for example, reducing the weight of the press-formed part and facilitating forming of the press-formed part by varying the tensile strength of the press-formed part in three or more levels.
  • the first aspect of the invention relates to a steel sheet heating device that heats a flat steel sheet, characterized by comprising: (a) a hot plate having a flat heating surface brought into close contact with the steel sheet; and (b) a plurality of heating equipment able to heat a plurality of heating regions, formed by dividing the heating surface of the hot plate into a plurality of sections, to different heating temperatures at the same time, (c) wherein the steel sheet is heated to different temperatures at various portions based on the heating temperatures of the plurality of heating regions of the heating surface, at the same time through a single heating treatment.
  • the second aspect of the invention relates to the steel sheet heating device according to the first aspect of the invention, characterized in that: (a) the hot plate is made of a single plate member; (b) the heating equipment include (b-1) multiple heaters disposed in the plate member at predetermined intervals so as to be positioned within a single plane parallel to the heating surface, and (b-2) multiple temperature control circuits disposed so as to correspond to the multiple heaters and able to control heating temperatures of the heaters independently of each other; and (b-3) the number of the plurality of heating regions that differ in heating temperature and ranges of the plurality of heating regions are able to set to any given number and any given ranges, respectively.
  • the third aspect of the invention relates to the steel sheet heating device according to the second aspect of the invention, characterized in that the heating temperature of the heater disposed near a boundary between the plurality of heating regions is made higher or lower than the heating temperature of the other heaters in the same heating region to alleviate an influence of the heating temperature of the contiguous heating region.
  • the fourth aspect of the invention relates to the steel sheet heating device according to the first aspect of the invention, characterized in that the hot plate includes a plurality of plate members that are aligned so as to correspond to the plurality of heating regions and that differ in heating temperature.
  • the fifth aspect of the invention relates to the steel sheet heating device according to the fourth aspect of the invention, characterized in that a heat insulator is disposed at a boundary between the plurality of plate members.
  • the sixth aspect of the invention relates to the steel sheet heating device according to any one of the first to the fifth aspects of the invention, characterized in that: there are provided a pair of the hot plates each of which has the flat heating surface brought into close contact with the steel sheet, the plurality of heating regions formed by dividing the heating surface into the plurality of sections being heated by the plurality of heating equipment; and the steel sheet is sandwiched between the hot plates and heated from both sides.
  • the seventh aspect of the invention relates to the steel sheet heating device according to any one of the first to the sixth aspect of the invention, characterized in that: (a) the steel sheet is a steel sheet for hot-pressing; and (b) at least part of the steel sheet for hot-pressing is heated to a temperature equal to or higher than a transformation point Ac 3 by heating at least part of the plurality of heating regions to a temperature equal to or higher than the transformation point Ac 3 .
  • hot-pressing signifies subjecting a steel sheet, which has been heated to a temperature equal to or higher than the transformation point Ac 3 , to press-forming, and subsequently, rapidly cooling the steel sheet retained in a die, so that martensitic transformation is caused to quench-harden the steel sheet.
  • the steel sheet for hot-pressing signifies a steel sheet for quenching that is subjected for the above-described press-forming.
  • the transformation point Ac 3 is a temperature to which the steel sheet needs to be heated in order to cause the martensitic transformation through cooling during the press-forming so that the steel sheet is quench-hardened.
  • the transformation point Ac 3 is the temperature for transforming the structure of the steel sheet for hot-pressing into austenite structure.
  • the transformation point Ac 3 varies depending on, for example, the carbon content.
  • the eighth aspect of the invention relates to a method for producing a prescribed press-formed part, in which tensile strength varies at different portions, by subjecting a steel sheet for hot-pressing to press-forming, characterized by comprising: (a) a heating process in which the steel sheet for hot-pressing is heated to different temperatures at various portions at the same time through a single heating treatment such that at least part of the steel sheet for hot-pressing is heated to a temperature equal to or higher than a transformation point Ac 3 ; and (b) a press-forming process in which the steel sheet for hot-pressing, which has been heated to the different temperatures at the various portions though the heating process, is subjected to press-forming to be formed into a prescribed shape, and, at the same time, the steel sheet for hot-pressing is rapidly cooled to be quench-hardened based on the temperatures to which the steel sheet for hot-pressing has been heated so that the tensile strength varies at different portions.
  • the ninth aspect of the invention relates to a press-formed part in which tensile strength is varied at different portions by quench-hardening, the press-formed part being formed by heating a single steel sheet for hot-pressing to different temperatures at various portions such that at least part of the steel sheet for hot-pressing is heated to a temperature equal to or higher than a transformation point Ac 3 , and subsequently forming the steel sheet for hot-pressing into a prescribed shape through press-forming, and, at the same time, rapidly cooling the steel sheet for hot-pressing so that the part which has been heated to the temperature equal to or higher than the transformation point Ac 3 is quench-hardened, characterized in that the steel sheet for hot-pressing is divided into three or more portions and the three or more portions are heated to different temperatures, two or more portions out of the three or more portions are heated to different temperatures that are equal to or higher than the transformation point Ac 3 , and the press-forming is subsequently performed, whereby three or more portions, which differ in tensile strength in three or more levels due to
  • the heating surface is divided into the plurality of heating regions and the plurality of heating regions are heated to different heating temperatures by the plurality of the heating equipment, it is possible to heat the steel sheet to different temperatures at various portions, based on the heating temperatures of the plurality of heating regions of the heating surface, at the same time through a single heating treatment with the use of the hot plates.
  • the steel sheet is heated to different temperatures at various portions in order to quench-harden part of the steel sheet, as in the case where the reinforcement member for a center pillar mentioned above is formed, it is possible to perform the heating treatment easily and within a short time.
  • the hot plate is made of a single plate member, the multiple heaters are provided at predetermined intervals in the hot plate, and the temperatures of the multiple heaters are controlled independently of each other by the temperature control circuits. Therefore, it is possible to set the number of the plurality of heating regions that differ in heating temperature and the ranges of the plurality of heating regions to any given number and any given ranges. Accordingly, it is possible to employ multiple types of the steel sheets that differ in the number of the heating regions, ranges of the heating regions and the heating temperatures. As a result, it is possible to achieve high versatility and reduce the facility costs relatively.
  • the heating temperature of the heater positioned near the boundary between the plurality of heating regions is made higher or lower than the heating temperature of the other heaters in the same heating region in order to alleviate the influence of the heating temperature of the consecutive heating region. Therefore, the heating temperature sharply changes at the boundaries. Accordingly, it is possible to heat the plurality of heating regions to predetermined heating temperatures respectively with high accuracy.
  • the hot plate has the plurality of plate members that are aligned so as to correspond to the plurality of heating regions and that differ in the heating temperature. Therefore, it is possible to heat, through a single heating treatment, the steel sheet at the same time to different temperatures at various portions.
  • the heat insulator is disposed at the boundary between the plurality of plate members, the heating temperature is changed sharply at the boundary, and the plurality of heating regions are heated to predetermined heating temperatures respectively with high accuracy.
  • the steel sheet is sandwiched between a pair of hot plates and then heated, it is possible to perform the heating treatment within a short time, and to achieve a target temperature distribution with higher accuracy.
  • the steel sheet for hot-pressing is heated to different temperatures at various portions. At least part of the steel sheet is heated to a temperature equal to or higher than the transformation point Ac 3 , and the steel sheet that has been heated is subjected to press-forming, and at the same time, rapidly cooled. Thus, the part of the steel sheet is quench-hardened based on the temperatures to which the steel sheet is heated. As a result, the press-formed part in which the tensile strength varies at different portions is obtained. In this case, because the steel sheet for hot-pressing is heated at once, it is possible to easily control the temperatures of the various portions of the steel sheet for hot-pressing, and to achieve a target temperature distribution with high accuracy. As a result, it is possible to improve the degree of tensile strength and the accuracy of strength distribution of the press-formed part obtained through press-forming subsequently performed.
  • the eighth aspect of the invention relates to a method for producing a prescribed press-formed part, in which the tensile strength varies at different portions, by subjecting the steel sheet for hot-pressing to press-forming.
  • the heating treatment is performed using, for example, the heating device according to the seventh aspect of the invention.
  • the steel sheet for hot-pressing is heated to different temperatures at various portions at the same time such that at least part of the steel sheet for hot-pressing is heated to a temperature equal to or higher than the transformation point Ac 3 .
  • press-forming is performed in the press-forming process so that the steel sheet is formed into a prescribed shape, and, at the same time, the steel sheet is rapidly cooled to be quench-hardened based on the temperatures to which the steel sheet has been heated.
  • the press-formed part in which the tensile strength varies at different portions is obtained.
  • the steel sheet for hot-pressing is heated to different temperatures at various portions at the same time in a single heating treatment. Accordingly, it is possible to easily perform the heating treatment within a short time.
  • the steel sheet for hot-pressing is heated at once, it is possible to easily control the temperatures of the various portions of the steel sheet for hot-pressing and to achieve the target temperature distribution with high accuracy. As a result, it is possible to improve the degree of tensile strength and the accuracy of strength distribution of the press-formed part obtained through press-forming subsequently performed.
  • three or more portions of which the tensile strength varies in three levels or more are formed in the press-formed part in the following manner.
  • the single steel sheet for hot-pressing is divided into the three or more portions, the three or more portions are heated to different temperatures respectively by the heating device, the heating process or the like, and two or more portions of the three or more portions are heated to different temperatures that are equal to or higher than the transformation point Ac 3 .
  • the steel sheet is subjected to press-forming in this state. Due to the differences among the temperatures to which the three or more portions are heated, the tensile strength varies in three levels or more.
  • the tensile strength in the press-formed part varies in three levels or more as described above, for example, it is possible to improve various performances of the press-formed part, such as to reduce the weight of the press-formed part while improving impact energy absorption performance by optimizing the strength distribution in the press-formed part, and to facilitate forming of the overall press-formed part.
  • FIGS. 1A to 1C are views illustrating a heating process in which a steel sheet for hot-pressing is heated to different temperatures at various portions by a heating device according to a first embodiment of the invention
  • FIGS. 2A and 2B are views schematically illustrating the structure of the heating device in FIGS. 1A and 1B , wherein FIG. 2A is a plan view illustrating a lower hot plate, and FIG. 2B is a sectional view taken along the line IIB-IIB in FIG. 2A ;
  • FIGS. 3A and 3B are views illustrating a plurality of heating regions, which are heated to different heating temperatures, formed in the heating device shown in FIGS. 2A and 2B in a manner different from that in FIGS. 2A and 2B ;
  • FIG. 4 is a graph illustrating an example of the result of a study on the relationship between the temperature to which a blank is heated and the Vickers hardness Hv after the blank is quench-hardened through press-forming;
  • FIGS. 5A and 5B are views illustrating an example of the relationship between temperatures to which various portions of the blank are heated and the tensile strengths of the various portions after press-forming, when a reinforcement member for a vehicle center pillar is produced by a production method according to the invention.
  • FIGS. 6A and 6B are views illustrating a heating device according to a second embodiment of the invention, in which a hot plate is formed of a plurality of plate members.
  • Prescribed press-formed parts in which the tensile strength varies at different portions are used as, for example, vehicle reinforcement members such as a reinforcement member for a center pillar and a bumper reinforcement member, other press-formed parts for a vehicle such as a door beam and a rocker, and other press-formed parts such as a reinforcement member used for a purpose other than a vehicle.
  • the tensile strength is varied at different portions by heating a steel sheet for hot-pressing to different temperatures at various portions, forming the steel sheet for hot-pressing into a predetermined shape through press-forming and, at the same time, rapidly cooling the steel sheet for hot-pressing so that part of the steel sheet is quench-hardened according to the heating temperatures.
  • the heating device according to any one of the first aspect of the invention to the seventh aspect of the invention is used preferably in the heating process for producing the press-formed part. Further, the heating device may be adapted to other uses in which a flat steel sheet is heated to different temperatures at various portions.
  • the steel sheet that is heated by the heating device according to the first aspect of the invention need not be a steel sheet for hot-pressing.
  • sheathed heaters are preferably used.
  • near-infrared heaters such as halogen heaters or other heaters may be employed.
  • Various methods for heating the heating surface to different temperatures at various portions may be employed. If the temperatures of the heaters themselves are adjustable, the temperatures of the heaters may be adjusted. Alternatively, the temperature of the heating surface may be varied by changing the number of heaters (per unit area) or changing the distance between the heating surface and the heaters.
  • the multiple heaters are disposed in the hot plate at predetermined intervals respectively so as to be positioned within a single plane that is parallel to the heating surface.
  • disc-shaped or dice-shaped heaters are disposed in a grid, or long heaters are disposed parallel to each other at predetermined intervals.
  • the temperatures of the individual heaters are controlled independently of each other, and it is possible to set the number of a plurality of heating regions that differ in heating temperature and the ranges of the heating regions to any possible given number and any possible given ranges based on the arrangement of the heaters.
  • the shapes of the heating regions may be set to any given shapes.
  • the temperature of the heater near the boundary with the contiguous region is made lower than the target heating temperature
  • the temperature of the heater near the boundary with the contiguous region is made higher than the target heating temperature.
  • the hot plate is formed of a plurality of plate members that differ in heating temperature.
  • the heating temperature may be varied by changing the number of heaters (per unit area) or changing the distance between the heating surface and the heaters based on the heating temperatures of the plate members respectively.
  • the heat insulator is disposed at the boundary between the plurality of plate members.
  • simply a gap may be formed between the plurality of plate members, or the plurality of plate members may be brought into close contact with each other. When the plate members are brought into close contact with each other, it is preferable to correct the temperature of the heater positioned near the boundary as in the third invention, if possible.
  • the steel sheet is sandwiched between the hot plates and heated from both sides.
  • the steel sheet may be heated from only one side, for example, by placing the steel sheet on a single hot plate.
  • At least part of the steel sheet for hot-pressing is heated to a temperature equal to or higher than the transformation point Ac 3 .
  • the quench-hardness or the tensile strength varies depending on the temperature.
  • the overall steel sheet for hot-pressing may be heated to temperatures equal to or higher than the transformation point Ac 3 that are different at various portions.
  • three or more portions may be heated to different temperatures at the same time by the heating device according to any one of the first to seventh aspects of the invention or by the method according to the eighth aspect of the invention.
  • the three or more portion may be heated to different temperatures in multiple processes as described in, for example, JP 2009-95869 A.
  • FIGS. 1A to 1C are views illustrating a heating process in which a flat blank 16 cut into a predetermined shape is heated to different temperatures at various portions by a heating device 10 according to a first embodiment of the invention.
  • FIG. 1A is a view illustrating the state before the blank 16 is heated.
  • FIG. 1B is a view illustrating the state where the blank 16 is being heated.
  • FIG. 1C is a view illustrating the blank 16 after heated.
  • the heating device 10 includes a lower hot plate 12 and an upper hot plate 14 that are disposed substantially horizontally.
  • the blank 16 is sandwiched between the lower hot plate 12 and the upper hot plate 14 , for example, by placing the blank 16 on the lower hot plate 12 and then moving the upper hot plate 14 down using an elevating device (not shown).
  • a top surface 12 f of the lower hot plate 12 and a bottom surface 14 f of the upper hot plate 14 correspond to flat heating surfaces that are brought into close contact with the respective surfaces of the blank 16 .
  • the lower hot plate 12 and the upper hot plate 14 are formed in substantially the same manner except that they are configured so as to be symmetric in the up-down direction.
  • FIGS. 2A and 2B are views illustrating the lower hot plate 12 and a control system.
  • FIG. 2A is a plan view.
  • FIG. 2B is a view illustrating a cross section taken along the line IIB-IIB in FIG. 2A .
  • the lower hot plate 12 is made of a single flat plate member.
  • multiple linear and long sheathed heaters 18 a to 18 m (referred simply as “sheathed heaters 18 ” in FIG. 1 ) are disposed parallel to each other, side by side, and at predetermined intervals so as to be positioned within a single plane that is parallel to the top surface 12 f .
  • multiple linear holes are formed at a predetermined depth from the top surface 12 f and at predetermined intervals so as to be parallel to the top surface 12 f and parallel to each other.
  • the sheathed heaters 18 a to 18 m are disposed in the holes.
  • Temperature control circuits 32 a to 32 m each having, for example, a temperature sensor are connected to the multiple sheathed heaters 18 a to 18 m , respectively.
  • the temperature control circuits 32 a to 32 m are individually controlled by a control unit 30 . Thus, the temperatures of the sheathed heaters 18 a to 18 m are controlled independently of each other.
  • the lower hot plate 12 may be divided into a plurality of heating regions 20 , and the temperatures (heating temperatures) of the regions 20 of the top surface 12 f may be adjusted to any given different temperatures at the same time respectively.
  • the number of the heating regions 20 and the ranges of the heating regions 20 may be set to any given number and any given ranges, respectively.
  • FIGS. 3A and 3B illustrate a case where the lower hot plate 12 is divided into three heating regions, that is, a heating region 20 a that includes three sheathed heaters 18 a to 18 c , a heating region 20 b that includes seven sheathed heaters 18 d to 18 j , and a heating region 20 c that includes three sheathed heaters 18 k to 18 m .
  • FIGS. 3A and 3B illustrate another manner of dividing the lower hot plate 12 .
  • FIG. 3A illustrates a case where the lower hot plate 12 is divided into three heating regions, that is, a heating region 20 a that includes two sheathed heaters 18 a and 18 b , a heating region 20 b that includes six sheathed heaters 18 c to 18 h , and a heating region 20 c that includes five sheath heaters 18 i to 18 m .
  • FIG. 1 illustrates a case where the lower hot plate 12 is divided into three heating regions, that is, a heating region 20 a that includes two sheathed heaters 18 a and 18 b , a heating region 20 b that includes six sheathed heaters 18 c to 18 h , and a heating region 20 c that includes five sheath heaters 18 i to 18 m .
  • FIG. 3B illustrates a case where the lower hot plate 12 is divided into four heating regions, that is, a heating region 20 a that includes two sheathed heaters 18 a and 18 b , a heating region 20 b that includes three sheathed heaters 18 c to 18 e , a heating region 20 c that includes three sheathed heaters 18 f to 18 h , and a heating region 20 d that includes five sheathed heaters 18 i to 18 m .
  • various other manners of dividing the lower hot plate 12 into a plurality of heating regions may be employed.
  • the upper hot plate 14 as well as the lower hot plate 12 may be divided into a plurality of heating regions 20 , and the temperatures (heating temperatures) of the regions 20 of the bottom surface 14 f may be adjusted to different desired temperatures at the same time respectively.
  • each of the hot plates 12 and 14 is divided into the heating regions 20 a to 20 c , and the temperature control is executed such that the heating temperatures of the heating regions 20 a , 20 b and 20 c of the upper hot plate 14 are substantially equal to the heating temperatures of the heating regions 20 a , 20 b and 20 c of the lower hot plate 12 , respectively.
  • FIG. 1A each of the hot plates 12 and 14 is divided into the heating regions 20 a to 20 c , and the temperature control is executed such that the heating temperatures of the heating regions 20 a , 20 b and 20 c of the upper hot plate 14 are substantially equal to the heating temperatures of the heating regions 20 a , 20 b and 20 c of the lower hot plate 12 , respectively. In this state, as shown in FIG.
  • the hot plates 12 and 14 are brought into close contact with both sides of the blank 16 such that the blank 16 is sandwiched between the hot plates 12 and 14 in the up-down direction.
  • the blank 16 is divided into three portions 16 a to 16 c that correspond to the heating regions 20 a to 20 c , respectively, and the portions 16 a to 16 c of the blank 16 are heated to different temperatures at the same time respectively.
  • the sheathed heaters 18 c , 18 d , 18 j and 18 k are positioned near the boundaries between the plurality of heating regions 20 a to 20 c .
  • the heating temperature of each of the sheathed heaters 18 c , 18 d , 18 j and 18 k is made higher or lower than the heating temperature of the other heaters in the same heating region in order to alleviate the influence of the heating temperature of the contiguous heating region.
  • the temperatures of the sheathed heaters 18 c and 18 k which are positioned at the edge portion of the heating regions 20 a and 20 c respectively next to the heating region 20 b , are reduced based on, for example, target temperature differences. Further, the temperatures of the sheathed heaters 18 d and 18 j that are positioned at respective ends of the heating region 20 b are increased based on, for example, the target temperature differences. Thus, the heating temperature sharply changes at the boundaries, and the plurality of heating regions 20 a to 20 c are heated to the respective target heating temperatures with high accuracy. Thus, the portions 16 a to 16 c of the blank 16 are able to be heated to the respective target temperatures with high accuracy.
  • the blank 16 is made of a steel sheet for hot-pressing that can be quench-hardened due to martensitic transformation caused by rapid cooling from a temperature equal to or higher than the transformation point Ac 3 . At least part of the plurality of heating regions 20 a to 20 c of each of the hot plates 12 and 14 is heated to the transformation point Ac 3 or higher, and at least part of the three portions 16 a to 16 c of the blank 16 is also heated to the transformation point Ac 3 or higher.
  • FIG. 4 illustrates an example of the result obtained by checking, according to “Vickers hardness test method” defined in Japanese Industrial Standards JIS-Z2244, the Vickers hardness Hv after quench-hardening through press-forming, while variously changing the temperature to which the blank 16 is heated.
  • the transformation point Ac 3 in this case is approximately 730° C.
  • the Vickers hardness Hv increases due to quench-hardening. Even after the temperature of the blank 16 exceeds the transformation point Ac 3 , the Vickers hardness Hv varies depending on the temperature to which the blank 16 is heated. If the blank 16 is heated to approximately 800° C., the Vickers hardness Hv becomes approximately 300. If the blank 16 is heated to approximately 850 to 900° C., the Vickers hardness Hv exceeds 400.
  • FIGS. 5A and 5B are views illustrating an example of a press-formed part that is produced through the heating process and the press-forming process according to the first embodiment.
  • FIGS. 5A and 5B illustrate a case where a reinforcement member 62 for a vehicle center pillar is produced as a press-formed part.
  • FIG. 5A illustrates the case where a blank 60 , which is made of a steel sheet for hot-pressing and has a predetermined shape, is divided into four portions 60 a to 60 d and the four portions 60 a to 60 d are heated, at the same time, to different temperatures by the heating device 10 shown in FIGS. 1A and 1B to FIGS. 3A and 3B .
  • FIG. 5B illustrates the reinforcement member 62 formed in a predetermined shape by subjecting the blank 60 , heated as taught in FIG. 5A , to press-forming.
  • the pillar upper portion 62 b is given a tensile strength of approximately 1500 MPa and a Vickers hardness Hv of approximately 450
  • the pillar lower portion 62 c is given a tensile strength of approximately 980 MPa and a Vickers hardness Hv of approximately 300.
  • Each of the remaining T-shaped upper portion 62 a and the T-shaped lower portion 62 d has a tensile strength of approximately 590 MPa and a Vickers hardness Hv of approximately 180, which are the original tensile strength and Vickers hardness Hv of the material.
  • the tensile strength of the pillar portions 62 b and 62 c By increasing the tensile strength of the pillar portions 62 b and 62 c through quench-hardening as described above, it is possible to reduce the thickness of the reinforcement member 62 to achieve weight reduction, while appropriately ensuring predetermined impact energy absorption performance in the event of, for example, a side-impact collision. Especially, because the tensile strength of the pillar upper portion 62 b is made higher than the tensile strength of the pillar lower portion 62 c , it is possible to achieve the predetermined impact energy absorption performance while appropriately protecting, for example, the head of an occupant.
  • the T-shaped upper and lower portions 62 a and 62 d that have complicated shapes are portions that are not quench-hardened.
  • the portions 60 a and 60 d to be formed into these portions 62 a and 62 d are heated to a temperature equal to or higher than the softening temperature of the blank 60 , and therefore the required pressing pressure is reduced. As a result, the overall blank 60 is easily pressed into shapes through a single heating treatment.
  • the heating device 10 has the hot plates 12 and 14 that have the flat heating surfaces (top surface 12 f , bottom surface 141 ) that are brought into close contact with the blank 16 or 60 .
  • Each heating surface is divided into the plurality of heating regions 20 and the plurality of heating regions 20 are heated to different heating temperatures by the multiple sheathed heaters 18 a to 18 m .
  • the hot plates 12 and 14 of the heating device 10 it is possible to heat the blank 16 or 60 to different temperatures at various portions, based on the heating temperatures of the plurality of heating regions 20 of the heating surface, at the same time through a single heating treatment.
  • the blank 60 when the blank 60 is heated to different temperatures at various portions in order to quench-harden part of the blank 60 , as in the case where the reinforcement member 62 for a center pillar shown in FIG. 5 is formed, it is possible to perform the heating treatment easily and within a short time. In addition, it is possible to easily control the temperature because the blank 60 is heated at once. As a result, it is possible to achieve a target temperature distribution with high accuracy.
  • each of the hot plates 12 and 14 is made of a single plate member.
  • the multiple sheathed heaters 18 a to 18 m are provided at predetermined intervals, and the temperatures of the sheathed heaters 18 a to 18 m are controlled independently of each other by the temperature control circuits 32 a to 32 m . Therefore, it is possible to set the number of the plurality of heating regions 20 that differ in heating temperature and the ranges of the plurality of heating regions 20 to any given number and any given ranges. Accordingly, it is possible to employ multiple types of blanks 16 and 60 that differ in the number of the heating regions 20 , ranges of the heating regions 20 and the heating temperatures. As a result, it is possible to achieve high versatility and reduce the facility costs.
  • the heating temperature of each of the sheathed heaters positioned near the boundaries between the plurality of heating regions 20 is made higher or lower than the heating temperature of the other sheathed heaters in the same heating region in order to alleviate the influence of the heating temperatures of the consecutive heating regions. Therefore, the heating temperature sharply changes at the boundaries. Accordingly, it is possible to heat the plurality of heating regions 20 to predetermined heating temperatures with high accuracy respectively.
  • the blank 16 or 60 is sandwiched between a pair of hot plates 12 and 14 and then heated. Accordingly, it is possible to perform the heating treatment within a short time, and to achieve a target temperature distribution with higher accuracy.
  • a prescribed press-formed part in which the tensile strength varies at different portions is produced by subjecting the blank 16 or 60 , made of a steel sheet for hot-pressing, to press-forming.
  • the heating treatment is performed using the heating device 10 shown in FIGS. 1A and 1B , FIGS. 2A and 2B , and FIGS. 3A and 3B .
  • the blank 16 is heated to different temperatures at various portions at the same time such that the temperature of at least part of the blank 16 becomes equal to or higher than the transformation point Ac 3 .
  • press-forming is performed in the press-forming process.
  • the blank 16 is formed in a predetermined shape and, at the same time, quench-hardened through rapid cooling based on the temperatures to which the blank 16 is heated.
  • the blank 16 or 60 is heated to different temperatures at various portions, at the same time, through a single heating treatment by the heating device 10 . Therefore, it is possible to perform the heating treatment easily and within a short time.
  • the blank 16 or 60 is heated at once, it is easy to control the temperatures of each of the portions 16 a to 16 c of the blank 16 or each of the portions 60 a to 60 d of the blank 60 , and to achieve the target temperature distribution with high accuracy. Further, it is possible to increase the degree of tensile strength and the accuracy of the strength distribution of the press-formed part such as the reinforcement member 62 obtained through subsequently performed press-forming.
  • the four portions 62 a to 62 d of which the tensile strength varies in three levels are formed in the reinforcement member 62 in the following manner.
  • the blank 60 made of a single steel sheet for hot-pressing is divided into the four portions 60 a to 60 d , the four portions 60 a to 60 d are heated to different temperatures respectively by the heating device 10 , and the two portions 60 b and 60 c of the four portions 60 a to 60 d are heated to different temperatures that are equal to or higher than the transformation point Ac 3 . Then, the blank 60 is subjected to press-forming in this state. Due to the differences among the temperatures to which the portions 60 a to 60 d are heated, the tensile strength varies in three levels.
  • the tensile strength varies in three levels as described above, it is possible to reduce the weight of the reinforcement member 62 while appropriately ensuring predetermined impact energy absorption performance in the event of, for example, a side-impact collision using the pillar portions 62 b and 62 c that are given a high tensile strength through quench-hardening.
  • a hot plate 40 shown in FIG. 6A has a plurality of plate members 42 , 44 and 46 that are aligned so as to correspond to the plurality of heating regions and that differ in heating temperature.
  • Heat insulators 48 are disposed at the boundaries (gaps) between the plate members 42 , 44 and 46 respectively, and the plate members 42 , 44 and 46 are attached onto a common single base 50 . In this state, the hot plate 40 is used.
  • FIG. 6B illustrates the three types of plate members 42 , 44 and 46 that differ in heating temperature when they are not assembled together. These plate members 42 , 44 and 46 are equal in size but different in the number of sheathed heaters 52 embedded therein. Thus, the heating temperatures of the plate members 42 , 44 and 46 differ from each other.
  • the sheathed heaters 52 are configured so as to generate the same amount of heat respectively. Therefore, in the plate member having a larger number of sheathed heaters 52 , the heating temperature of the heating surface is higher. Therefore, among the plate members 42 , 44 and 46 , the plate member 42 has the lowest heating temperature and the plate member 46 has the highest heating temperature.
  • a pair of hot plates 40 is prepared, and the blank 16 is sandwiched between the pair of the hot plates 40 and then heated.
  • the hot plate 40 in the second embodiment has the plurality of plate members 42 , 44 and 46 that are aligned so as to correspond to the plurality of heating regions and that differ in the heating temperature. Therefore, it is possible to heat, through a single heating treatment, the blank 16 , 60 or the like at the same time to different temperatures at various portions based on the heating temperatures of heating surfaces 42 f , 44 f , and 46 f . Accordingly, as in the first embodiment, it is possible to perform the heating treatment easily and within a short time, and easily control the temperature because the different portions of the blank 16 , 60 are heated at once.
  • the heat insulators 48 are disposed at the boundaries (gaps) between the plurality of plate members 42 , 44 and 46 respectively, the heating temperature is changed sharply at the boundaries, and the plurality of heating regions are heated to predetermined heating temperatures respectively with high accuracy.
  • a part such as the reinforcement member 62 shown in FIG. 5 is formed by quench-hardening through hot press-forming from the blank 16 or 60 , it is possible to control the range of quench-hardening, the degree of hardening to be achieved and the like with high accuracy.
  • the multiple sheathed heaters 52 in the second embodiment may be configured such that the temperatures of the sheathed heaters 52 may be adjusted independently of each other, as in the first embodiment.
  • the heating temperatures of the heating surfaces 42 f , 44 f and 46 f of the plate members 42 , 44 and 46 may be set to any given temperatures respectively.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Control Of Resistance Heating (AREA)
  • Heat Treatment Of Articles (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
US13/067,568 2010-06-11 2011-06-09 Steel sheet heating device, method for producing press-formed part, and press-formed part Abandoned US20110303330A1 (en)

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CN106391882A (zh) * 2016-10-27 2017-02-15 哈尔滨工业大学（威海） 一种基于自阻加热性能梯度热冲压件的加工方法
WO2017134259A1 (de) * 2016-02-04 2017-08-10 Voestalpine Stahl Gmbh Vorrichtung zum herstellen von gehärteten stahlbauteilen und verfahren zum härten
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US20120118597A1 (en) * 2010-11-12 2012-05-17 Hilti Aktiengesellschaft Striking-mechanism body, striking mechanism and handheld power tool with a striking mechanism
US10201893B2 (en) * 2010-11-12 2019-02-12 Hilti Aktiengesellschaft Striking-mechanism body, striking mechanism and handheld power tool with a striking mechanism
US9951395B2 (en) 2012-03-13 2018-04-24 Asteer Co., Ltd. Method for strengthening steel plate member
US20150211084A1 (en) * 2012-03-29 2015-07-30 Aisin Takaoka Co., Ltd. Metal processing method and metal product processed thereby
CN103028645A (zh) * 2012-12-31 2013-04-10 哈尔滨工业大学 一种变强度分布高强钢板材零件的热冲压成形方法
CN103042070A (zh) * 2012-12-31 2013-04-17 哈尔滨工业大学 一种高强钢管材热成形时控制强度分布的方法
US10519523B2 (en) 2013-02-01 2019-12-31 Aisin Takaoka Co., Ltd. Infrared heating method, infrared heating and forming method of steel sheet and automobile component obtained thereby, and infrared heating furnace
CN103317033A (zh) * 2013-06-24 2013-09-25 上海大学 一种可定制超高强钢热冲压件强度的成形方法
US20150028625A1 (en) * 2013-07-26 2015-01-29 GM Global Technology Operations LLC Body component and method for producing a body component
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CN105750426A (zh) * 2014-12-18 2016-07-13 北京有色金属研究总院 镁合金型材高温预拉伸快速加热系统
US20180231311A1 (en) * 2015-08-07 2018-08-16 Schwartz Gmbh Method for heat treatment of a sheet steel component and heat treatment apparatus therefor
WO2017134259A1 (de) * 2016-02-04 2017-08-10 Voestalpine Stahl Gmbh Vorrichtung zum herstellen von gehärteten stahlbauteilen und verfahren zum härten
EP3276012A1 (de) * 2016-07-29 2018-01-31 Benteler Automobiltechnik GmbH Temperierstation mit mantelheizleiter
CN106077298A (zh) * 2016-08-09 2016-11-09 机械科学研究总院先进制造技术研究中心 一种轻合金板材高效热冲压成形模具
CN106391882A (zh) * 2016-10-27 2017-02-15 哈尔滨工业大学（威海） 一种基于自阻加热性能梯度热冲压件的加工方法
US11951520B2 (en) 2019-04-10 2024-04-09 Nippon Steel Corporation Blank and component
CN112427556A (zh) * 2020-09-28 2021-03-02 北京卫星制造厂有限公司 一种大型金属板材自阻加热成形装置与方法
US20220112568A1 (en) * 2020-10-14 2022-04-14 Benteler Automobiltechnik Gmbh Method for producing a steel blank and temperature-adjusting station

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EP2395116A2 (en) 2011-12-14
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