JP4994934B2 - Die quench method - Google Patents

Description

  The present invention relates to a die quench method for forming a reinforced press-molded product by quenching by rapidly cooling a material in a high temperature region while press-molding.

  Patent Document 1 discloses a reinforced press-formed product by punching a metal plate from a roll material, heating the metal plate to a high temperature region (above 850 ° C. and less than the melting point), and rapidly cooling the heated metal plate while press-forming it. Is disclosed.

  In Patent Document 2, a basic sheet and a reinforcing sheet are soldered to form a laminated body, the laminated body is heated to a high temperature, and in that state, the laminated body is cooled while being press-molded by a molding tool including a mold. A method of forming a metal molded article is disclosed.

  Patent Document 3 discloses a process of forming a part material, a process of forming a blank outline substantially corresponding to a manufactured part in the part material, and heating the edged part material and press-quenching with a hot forming tool. And a method of performing the steps.

  Patent Document 4 discloses a method in which a blank material is partially quenched in advance to form a partially quenched portion, and the vehicle skeleton member is press-molded so that the blank material is bent at the partially quenched portion. ing. According to this, it does not relate to a die quench method in which a heated blank material is rapidly cooled while being press-molded, and press molding is performed when the blank material is in a normal temperature state.

Patent Document 5 discloses a press molding method that increases bending rigidity by increasing the secondary moment of section of a workpiece by forming standing bent portions on both sides or one side of a strip-like workpiece. . According to this, it is not related to the die quench method, and the press molding is performed when the workpiece is in a normal temperature state.
JP 2002-102980 A Japanese Patent No. 3553536 JP 2005-539145 A JP 2002-68012 A Japanese Patent Laid-Open No. 9-94619

  The technologies according to Patent Documents 1 to 3 described above are technologies related to a die quench method in which a material formed of metal is heated to a high temperature equal to or higher than the quenching temperature, and the material is rapidly cooled while being pressed.

  In the die quench method, the material heated to a high temperature before press molding has a lower strength than that at room temperature, and thus deformation such as warping may occur considerably in the material. The cause of deformation is assumed to be due to gravity, heating unevenness, residual stress, and the like. In particular, when the length of the material is longer than the width, the amount of deformation such as warpage tends to increase. If the material is deformed in this way, there is a possibility of causing a problem in a subsequent process.

  The present invention has been made in view of the above-described circumstances, can suppress deformation such as warpage generated in a heated material, and can suppress the occurrence of problems due to deformation of the material in a subsequent process. It is an object to provide a die quench method.

The constitutional feature of the invention according to claim 1 for solving the above-mentioned problem is that it is a preparation for preparing a material made of a metal having a preliminary cross-sectional structure for increasing the moment of inertia of the cross section and having a quenchable composition Process,
A heating step of heating the material by a heating means in a high temperature region above the quenchable temperature;
A die quench step for forming a reinforced press-formed product by quenching by cooling the material in a high-temperature region with a molding die capable of cooling and molding the material and performing a tempered press-molded product in order,
The preliminary cross-sectional structure is one of a groove forming shape, a V-shape, and a hemispherical shape for forming a groove in a cross section.
A structural feature of the invention according to claim 2 is that, in claim 1, the reinforced press-formed product has a shape including a channel part having a forming groove in a cross section.
Hereinafter, aspects 1 to 4 are described as a reference for understanding the invention.
(1) The die quench method according to aspect 1 is a preparatory step of preparing a material formed of a metal having a preliminary cross-sectional structure for increasing the moment of inertia of the cross section and having a quenchable composition, and the material can be quenched. A heating step of heating by a heating means to a high temperature region above the temperature, and a tempered press-molded product by quenching by cooling the material in the high temperature region while press-molding with a mold that can cool and mold the material. The die quench process to form is implemented in order.

  In the preparation step, a material having a preliminary cross-sectional structure for increasing the cross-sectional secondary moment is prepared. The preliminary cross-sectional structure means a cross-sectional structure having a considerably lower degree of forming than the final cross-sectional structure in the final shape of the reinforced press-formed product. That is, the preliminary cross-sectional structure is obtained by giving a shape (structure) far from the final shape (final cross-sectional structure) of the reinforced press-formed product to the material before forming the preliminary cross-sectional structure. Then, a heating process is performed with respect to the raw material, and the raw material is heated to a high temperature region equal to or higher than the quenchable temperature. Even when the material is heated to a high temperature region in this way, the cross-sectional secondary moment of the material is increased by the preliminary cross-sectional structure. For this reason, it is possible to suppress deformation such as warpage occurring in the material before press molding. Even if deformation such as warpage occurs in the material, it can be made as small as possible. Therefore, it is possible to suppress the occurrence of problems due to deformation in the subsequent process. The reinforced press-molded product may have a shape including a channel portion having a molding groove in cross section.

  (2) According to the die quench method according to aspect 2, in the above aspect, the mold has a fixed mold and a movable mold that can be clamped, and the die quench process is fixed with the material set in the fixed mold. In a state where the mold and the movable mold are clamped and the material is set in the fixed mold, a heat insulating space is formed between at least a part of the preliminary cross-sectional structure and the mold surface of the fixed mold. In addition, the contact area between the material and the mold surface of the fixed mold is reduced as compared with the case where the preliminary sectional structure is not formed. According to this aspect, in a state where the material is set in the fixed mold, a heat insulating space is formed between at least a part of the preliminary cross-sectional structure and the mold surface of the fixed mold, and the preliminary cross-sectional structure is Compared with the case where it is not formed, the contact area between the material and the mold surface of the fixed mold is reduced. For this reason, it is suppressed that the heat | fever of the raw material of a high temperature area escapes to the stationary mold | type side. Therefore, the temperature of the material can be maintained as high as possible before the fixed mold and the movable mold are clamped. Therefore, the quenching effect on the material can be enhanced.

  (3) According to the die quench method according to aspect 3, in the above-described aspect, in a state where the material is set in the fixed mold, the preliminary cross-sectional structure is an extension extending in a direction away from the fixed mold in the cross section It has the part. According to this aspect, when the fixed mold and the movable mold are clamped, excessive extension of the material is suppressed from rubbing against the fixed mold, and the stress load on the material and the fixed mold can be suppressed.

  (4) According to the die quench method according to aspect 4, in the aspect described above, the preliminary cross-sectional structure is any one of a groove forming shape, a V shape, and a hemispherical shape forming a groove in a cross section. It is characterized by that. According to this aspect, in a state where the material is set in a fixed mold, a heat insulating space is easily formed between at least a part of the preliminary cross-sectional structure and the fixed mold surface. For this reason, it is suppressed that the heat | fever of the raw material of a high temperature area escapes to the stationary mold | type side. Therefore, the temperature of the material can be maintained as high as possible before the fixed mold and the movable mold are clamped. Therefore, the quenching effect on the material can be enhanced.

  According to the die quench method according to the present invention, it is possible to suppress deformation such as warpage occurring in the material after the heating step and before press molding. Therefore, it is possible to suppress the occurrence of problems due to the deformation of the material in the subsequent process.

Hereinafter, this embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the die quench method according to the present embodiment is formed of a metal having a quenchable composition (generally, carbon steel or alloy steel) and is used as a preliminary for increasing the cross-sectional second moment. The preparation process A for preparing the material 1 having the cross-sectional structure 5 and the material 1 having the preliminary cross-sectional structure 5 are heated by a heating furnace 21 as a heating means in a high temperature region above the quenching temperature ( _{AC 3} transformation point or higher). Heating step B to be performed, and die quenching step C to form a tempered press-molded product 3 by quenching by cooling the material 1 in the high temperature region while press-molding the material 1 with a molding die 7 capable of cooling and molding the material 1. Carry out in order.

  In the preparation step A, the material 1 is formed by punching and pressing the material 40 obtained by rewinding the roll material 4 by the punching press device 42. The material 1 before forming the preliminary cross-sectional structure 5 is a plate-like metal plate material, and extends in the longitudinal direction. The carbon steel forming the material 1 is set to have a high carbon content (for example, 0.2% or more by mass ratio) so that it can be easily quenched.

  FIG. 2A is a perspective view showing a representative example of the reinforced press-formed product 3 in which the die quench step C is performed. FIG. 2B shows a cross-sectional view of the reinforced press-formed product 3 along the transverse direction. As shown in FIG. 2 (B), the reinforced press-molded product 3 has a cross-sectional shape including a channel portion 32 having a forming groove 30 and further expands outward from the end of the channel portion 32. A flange-shaped widened portion 34 is formed on the surface. The expansion part 34 is extended in the direction which mutually spaces apart. The reinforced press-formed product 3 can function as a reinforcing member that reinforces the vehicle body of the vehicle. As shown in FIG. 2B, the depth of the forming groove 30 of the reinforced press-formed product 3 is hX, and the height of the reinforced press-formed product 3 is MX.

As described above, in the preparation step A, the material 1 is formed by performing a punching press on the portion 40 where the roll material 4 wound with a metal having a quenchable composition is wound. Thereafter, a pre-forming step Aa for forming the preliminary cross-sectional structure 5 for increasing the cross-sectional secondary moment on the material 1 is performed. In the preforming step Aa described above, the preliminary cross-sectional structure 5 that increases the secondary moment of section of the material 1 is formed on the material 1 by the processing means 48. After the preforming step Aa, the heating step B is performed, and the material 1 on which the preliminary cross-sectional structure 5 is formed is heated to a high temperature region above the quenching temperature (above the _AC3 transformation point). By heating, all or most of the material 1 becomes an austenite region.

  The heating process B is performed by inserting the material 1 into a heating furnace 21 having a heating chamber 20. The atmosphere in the heating chamber 20 of the heating furnace 21 may be air, an inert gas such as nitrogen, or a vacuum. Even when the material 1 is heated to a high temperature region in this way, the secondary moment of section of the material 1 is increased by the preliminary cross-sectional structure 5, so that deformation such as warpage generated in the material 1 before press molding is performed. Can be suppressed. Even if deformation such as warpage occurs in the material 1, it can be made as small as possible. Therefore, it is possible to suppress the occurrence of problems due to deformation in the subsequent process. The heating process B may be performed by induction heating.

  According to the present embodiment, the preforming step Aa is performed between the preparation step A and the heating step B as described above. In the preforming step Aa, a preliminary cross-sectional structure 5 that increases the secondary moment of section of the material 1 is formed on the material 1.

  FIG. 3A shows a material 1 having a first preliminary sectional structure 5F. The first preliminary cross-sectional structure 5F is formed over the entire length so as to extend straight in the length direction of the material 1. FIG. 3B shows a cross section of the first preliminary cross-sectional structure 5F. The first preliminary cross-sectional structure 5F has a groove forming shape in cross section, a first bulging portion 50F that forms a shallow first groove 51F having a depth h1, and a first fold from the first bulging portion 50F. It has the 1st extension part 52F extended outward via the part 53F. The first extending portion 52F is formed in the end region in the width direction (arrow D direction) of the material 1. The first bulging portion 50F is formed in the central region of the material 1 in the width direction (arrow D direction). Here, as shown in FIG. 4B, the depth of the first groove 51F in the first preliminary sectional structure 5F is h1, the thickness of the material 1 is t1, and the height of the first preliminary sectional structure 5F. Is M1, for example, h1 = (0.3 to 1.5) × t1 or h1 = (0.8 to 1.2) × t1. For example, M1 = (1.5 to 3.5) × t1 or M1 = (1.7 to 2.5) × t1.

  Here, as shown in FIG. 4A, for a flat plate material 1X which is a comparative example in which the first preliminary sectional structure 5F is not formed, the width is A, the thickness is t1, and the secondary cross section Let the moment be SI (1). On the other hand, the second moment of section of the material 1 on which the first preliminary sectional structure 5F is formed is defined as SI (2). At this time, when h1 = t1 and M1 = 2 × t1, and when the width of the first preliminary sectional structure 5F is A / 3, the ratio of the moment of inertia of the section is SI (2) / SI (1) ≒ 1.5 Thus, the cross-sectional secondary moment of the material 1 having the first preliminary cross-sectional structure 5F is approximately 1.5 in comparison with the cross-sectional secondary moment of the flat plate-like material 1X not having the first preliminary cross-sectional structure 5F. The bending rigidity of the material 1 is considerably increased. SI (2) / SI (1) can be set to 1.3 to 5.0, for example.

  The thickness t1 of the material 1 can be 0.5 to 4 millimeters.

As described above, according to the present embodiment, the bending rigidity of the material 1 is considerably increased by the first preliminary cross-sectional structure 5F. Therefore, even if the material 1 is heated to the high temperature region (above the _AC3 transformation point). The cross-sectional secondary moment of the material 1 is increased. For this reason, the deformation | transformation of the curvature etc. which generate | occur | produce in the raw material 1 after the heating process B and before press molding can be suppressed. Even if deformation such as warpage occurs in the material 1, it can be made as small as possible. Therefore, it is possible to suppress the occurrence of problems caused by deformation such as warpage in the subsequent process.

  FIG. 5A shows the material 1 having the second preliminary sectional structure 5S. The second preliminary cross-sectional structure 5S is formed in the central region so as to extend straight in the length direction (arrow L direction) of the material 1. FIG. 5B shows a section of the second preliminary sectional structure 5S. The second preliminary sectional structure 5S has a groove forming shape in cross section, a second bulging portion 50S that forms a shallow second groove 51S having a depth h2, and a second fold from the second bulging portion 50S. A second extending portion 52S extending through the portion 53S. The second extending portion 52S is formed in the end region in the width direction (arrow D direction) of the material 1. Here, when the depth of the second groove 51S is h2, the thickness of the material 1 is t2, and the height of the second preliminary sectional structure 5S is M2, for example, h2 = (0.3 to 1.5) Xt2 or h2 = (0.8 to 1.2) * t2. For example, M2 = (1.5 to 3.5) × t2, or M2 = (1.7 to 2.5) × t2.

  FIG. 6A shows a material 1 having a third preliminary sectional structure 5T. FIG. 6B shows a section of the third preliminary sectional structure 5T. The third preliminary cross-sectional structure 5T is formed over the entire length so as to extend straight in the length direction of the material 1. The third preliminary sectional structure 5T has a groove forming shape in cross section, and a third fold portion 53T that forms a very shallow third groove 51T having a depth h3, and outward from the third fold portion 53T. And an extended third extending portion 52T. Accordingly, the third preliminary cross-sectional structure 5T has a V shape with a short cross section. The third fold portion 53T is formed in the central area of the material 1 in the width direction (arrow D direction). Here, when the depth of the third groove 51T is h3, the thickness of the material 1 is t3, and the height of the third preliminary sectional structure 5T is M3, for example, h3 = (0.3 to 1.5) Xt3 or h3 = (0.7 to 1.2) * t3. For example, M3 = (1.2 to 3.5) × t3 or M3 = (1.5 to 2.5) × t3.

  FIG. 7A shows a material 1 having a fourth preliminary sectional structure 5R. FIG. 7B shows a cross section of the fourth preliminary cross sectional structure 5R. The fourth preliminary cross-sectional structure 5R is formed so as to extend straight in the length direction of the material 1. The fourth preliminary cross-sectional structure 5R has a groove forming shape in cross section, and is a fourth extension formed through the fourth fold portion 53R so as to form a shallow fourth groove 51R having a depth h4. It has a part 52R. The fourth extending portion 52R is formed in the end region in the width direction (arrow D direction) of the material 1. Here, assuming that the depth of the fourth groove 51R is h4, the thickness of the material 1 is t4, and the height of the fourth preliminary sectional structure 5R is M4, for example, h4 = (0.3 to 1.5) Xt4 or h4 = (0.8 to 1.2) * t4. For example, M4 = (1.5 to 3.5) × t4 or M4 = (1.7 to 2.5) × t4.

  8 to 10 show typical examples of the die quench step C. FIG. FIG. 8 shows the mold 7 used in the die quench step C. The mold 7 includes a metal fixed mold 71 (lower mold, mold) and a metal movable mold 75 (upper mold, mold) that can be clamped and have good thermal conductivity. The fixed mold 71 and the movable mold 75 have a cooling passage 78 through which a cooling medium such as cooling water and cooling mist passes.

  8A and 8B show a process of die quenching the material 1 having the first preliminary sectional structure 5F and the material 1 having the second preliminary sectional structure 5S. In this process, the material 1 is set on the fixed mold surface 72 of the fixed mold 71 while the first bulged section 50F or the second bulged section 50S is disposed upward and the first groove 51F or the second groove 51S is disposed downward. To do. In this state, the movable mold 75 is moved (lowered) in the direction of the arrow Y1 toward the fixed mold 71, and the fixed mold surface 72 of the fixed mold 71 and the movable mold surface 76 of the movable mold 75 are clamped. Is done. In this case, the material 1 in a high temperature state is rapidly cooled and quenched by the fixed mold surface 72 of the fixed mold 71 and the movable mold surface 76 of the movable mold 75.

  Here, the depth h1 of the first groove 51F of the first preliminary cross-sectional structure 5F (see FIG. 4B) and the depth hX of the forming groove 51 of the reinforced press-formed product 3 (see FIG. 2B). For example, h1 = (0.02-0.4) × hX or h1 = (0.1-0.3) × hX. Thus, the depth h1 of the first groove 51F of the first preliminary sectional structure 5F is set to be considerably smaller than the depth hX of the forming groove 51 of the reinforced press-formed product 3. In other words, the first preliminary cross-sectional structure 5F means a cross-sectional structure having a considerably low forming degree as compared with the final cross-sectional structure in the final shape of the reinforced press-formed product 3. For this reason, when press-molding by die quenching, the preliminary cross-sectional structure 5F is suppressed from affecting the final shape of the reinforced press-formed product 3. The same applies to the relationship between h2, h3, h4 and hX.

Furthermore, according to this embodiment, in the heating process B performed before the die quench process C, the material 1 is heated to a high temperature state ( _AC3 transformation point or higher) that is equal to or higher than the quenching temperature, and is in an austenite state (red hot state). It is rich in plastic deformability. For this reason, when press-molding the raw material 1 with the molding die 7 used in the die quench step C, the shape of the first preliminary cross-sectional structure 5F does not affect the press molding in the die quench step C. Similarly, the shapes of the second preliminary cross-sectional structure 5S, the third preliminary cross-sectional structure 5T, and the third preliminary cross-sectional structure 5T heated to a high temperature do not affect the press forming in the die quench step C.

  Here, as shown in FIG. 8A, in a state where the material 1 having the first preliminary sectional structure 5F is set on the fixed mold 71, the lower surface of the first preliminary sectional structure 5F and the fixed mold 71 are fixed. A heat insulating space 8 is formed between the fixed mold surface 72. The heat insulating space 8 is formed based on the first groove 51F. The heat insulation space 8 extends over the entire length of the material 1 in the length direction. Furthermore, in the state where the material 1 is set on the fixed mold 71, the contact between the lower surface of the material 1 and the fixed mold surface 72 of the fixed mold 71 is compared with the case where the first preliminary sectional structure 5F is not formed. The area has decreased considerably. For this reason, the heat | fever of the raw material 1 of the high temperature area | region which has the 1st preliminary cross-sectional structure 5F is suppressed as much as possible to the fixed mold | type 71 side. Therefore, before the fixed mold 71 and the movable mold 75 are clamped, the temperature of the material 1 having the first preliminary cross-sectional structure 5F can be maintained as high as possible (above quenching temperature). In particular, the temperature of the first preliminary cross-sectional structure 5F that increases non-contact with the fixed mold 71 can be maintained as high as possible (higher than the quenching temperature). Therefore, the quenching effect on the material 1 having the first preliminary cross-sectional structure 5F can be enhanced, and the quenched structure can be favorably formed on the material 1.

  As described above, the preliminary sectional structure 5F has a function of forming the heat insulating space 8 between the material 1 and the fixed mold surface 72 of the fixed mold 71 in a state where the material 1 is set on the fixed mold 71, and the bending of the material 1 It also has a function of increasing the rigidity and suppressing deformation such as warping of the material 1.

  Here, as shown in FIG. 8A (cross section along the transverse direction of the material 1), the material 1 having the first preliminary sectional structure 5 </ b> F has a plurality of contact locations on the fixed mold surface 72 of the fixed mold 71. Since it is supported by W, the posture of the material 1 is stabilized and press molding is favorably performed. The same applies to the second preliminary sectional structure 5S, and the heat insulating space 8 is formed between the lower surface of the second preliminary sectional structure 5S and the fixed mold surface 72 of the fixed mold 71. 2) The heat of the material 1 in the high temperature region having the preliminary cross-sectional structure 5S is prevented from escaping to the fixed mold 71 side as much as possible.

  9A and 9B show a step of die quenching the material 1 having the third preliminary sectional structure 5T. As shown in FIG. 9A, in a state where the material 1 having the third preliminary sectional structure 5T is set in the fixed mold 71, the material 1 has an upside down V shape. A heat insulating space 8 is formed between the lower surface of the third preliminary sectional structure 5T and the fixed mold surface 72 of the fixed mold 71. The heat insulating space 8 is formed based on the third groove 51T. Further, the contact area between the material 1 and the fixed mold surface 72 of the fixed mold 71 is reduced as compared with the case where the third preliminary sectional structure 5T is not formed. That is, the lower surface of the third preliminary sectional structure 5T and the fixed mold surface 72 of the fixed mold 71 are cross-sectionally supported by a plurality of contact points W (two locations). For this reason, it is suppressed that the heat | fever of the raw material 1 of a high temperature area | region escapes to the fixed mold | type 71 side. Therefore, before the fixed mold 71 and the movable mold 75 are clamped, the temperature of the material 1 can be maintained as high as possible (above quenching temperature). Therefore, the quenching effect on the material 1 can be enhanced, and a quenched structure can be formed on the material 1 satisfactorily. Here, as shown in FIG. 9A (cross section along the transverse direction of the material 1), the material 1 having the first preliminary sectional structure 5 </ b> F has a plurality of contact points on the fixed mold surface 72 of the fixed mold 71. Since it is supported by W, the posture of the material 1 can be stabilized.

  FIGS. 10A, 10B, and 10C show a step of die quenching the material 1 having the fourth preliminary cross-sectional structure 5R. As shown in FIG. 10A, in a state where the material 1 having the fourth preliminary sectional structure 5R is set on the fixed mold 71, the lower surface of the fourth preliminary sectional structure 5R, the fixed mold surface 72 of the fixed mold 71, Are in contact. Further, as shown in FIG. 10A (cross section along the transverse direction of the material 1), the fourth extending portion 52R is located upward (in the direction of the arrow U) so as to be separated from the fixed mold surface 72 of the fixed mold 71. ). For this reason, the fourth extending portion 52 </ b> R is separated from the fixed mold surface 72 of the fixed mold 71 even while the fixed mold surface 72 of the fixed mold 71 and the movable mold surface 76 of the movable mold 75 are clamped. As a result, as shown in FIG. 10B, the fourth extending portion 52 is prevented from contacting the fixed mold surface 72 of the fixed mold 71, or the contact timing is delayed. Therefore, the degree to which the fourth extending portion 52R rubs against the mold surface portion 72c of the fixed mold surface 72 of the fixed mold 71 is suppressed. Therefore, it is possible to suppress excessive load deformation of the material 1 and damage to the mold surface portion 72 c of the fixed mold surface 72 of the fixed mold 71.

  In the embodiment described above, the preliminary cross-sectional structure 5 is formed by forming the material 1 by punching press processing on the portion 40 where the roll material 4 formed of a metal having a quenchable composition is rewound, and increasing the cross-sectional secondary moment. However, the present invention is not limited thereto, and the preliminary cross-sectional structure 5 may be formed at the same time as the material 1 is formed by punching and pressing the portion 40 where the roll material 4 is rewound. good.

  In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

  INDUSTRIAL APPLICABILITY The present invention can be used in a die quench method for quenching a member used for a vehicle, industrial equipment, or the like.

It is a conceptual diagram which shows a process. (A) is a perspective view of a reinforced press-formed product, and (B) is a cross-sectional view of the reinforced press-formed product. (A) is a perspective view of a material having a preliminary sectional structure, and (B) is a sectional view of the preliminary sectional structure. (A) is a sectional view of a material having no preliminary sectional structure, and (B) is a sectional view of a material having a preliminary sectional structure. (A) is a perspective view of a material having a preliminary sectional structure, and (B) is a sectional view of the preliminary sectional structure. (A) is a perspective view of a material having a preliminary sectional structure, and (B) is a sectional view of the preliminary sectional structure. (A) is a perspective view of a material having a preliminary sectional structure, and (B) is a sectional view of the preliminary sectional structure. (A) is a cross-sectional view of a state in which a material having a preliminary cross-sectional structure is set in a fixed mold, and (B) is a state in which a material having a preliminary cross-sectional structure is press-molded by a fixed mold and a movable mold. It is sectional drawing. (A) is a cross-sectional view of a state in which a material having a preliminary cross-sectional structure is set in a fixed mold, and (B) is a state in which a material having a preliminary cross-sectional structure is press-molded by a fixed mold and a movable mold. It is sectional drawing. (A) is a cross-sectional view of a state in which a material having a preliminary cross-sectional structure is set in a fixed mold, and (B) is a state in which a material having a preliminary cross-sectional structure is being press-molded between a fixed mold and a movable mold. (C) is a cross-sectional view of a state in which a material having a preliminary cross-sectional structure is press-molded with a fixed mold and a movable mold.

Explanation of symbols

  Reference numeral 1 denotes a material, 2 denotes a heating means, 3 denotes a press-molded product, 5 denotes a preliminary sectional structure, 7 denotes a molding die, 71 denotes a fixed die, and 72 denotes a movable die.

Claims (2)

A preparatory step of preparing a material formed of a metal having a preliminary cross-sectional structure for increasing the moment of inertia of the cross section and having a quenchable composition;
A heating step of heating the material by a heating means in a high temperature region above the quenchable temperature;
A die quench step for forming a reinforced press-formed product by quenching by cooling the material in a high-temperature region with a molding die capable of cooling and molding the material and performing a tempered press-molded product in order ,
The die quenching method according to claim 1, wherein the preliminary cross-sectional structure is any one of a groove forming shape for forming a groove, a V shape, and a heft shape in a cross section . Oite to claim 1, wherein the reinforcing press molded product is, in cross-section, die-quenching method characterized in that it comprises a shape including a channel portion having a molding groove.

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