JP2008087001A - Method of and apparatus for processing planar workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of and an apparatus for processing a planar workpiece which improve workability of the planar workpiece, achieve hardening of the workpiece and suppress degradation in blanking property. <P>SOLUTION: In the working of the planar workpiece W1 using forming dies 10, 20, the planar workpiece is energized by bringing an electrode 41 into contact with the planar workpiece. The internal region which is heated by energization and the peripheral region which is situated on the outside of the internal region are formed and also only the internal region is heated up to hardening temperature. After the internal region is heated to the hardening temperature, the planar workpiece is worked into a prescribed shape with the forming dies, also the internal region is hardened and, after the planar workpiece is worked, the planar workpiece is blanked including at least a part of the peripheral region. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a processing method and a processing apparatus for a plate workpiece that processes a plate workpiece using a mold.

  For example, plate-like materials (plate-like workpieces) such as steel plates for automobiles are generally used after being processed into a predetermined shape by pressing, and the formability of the plate-like workpiece is increased by heating. It is known that the plate-like workpiece is pressed using a forming die that is provided with a punch that can be moved up and down and a die that is disposed so as to face the punch.

  As such plate-shaped workpiece press processing, it is known that the plate-shaped workpiece is heated by a heating furnace, and the heated plate-shaped workpiece is conveyed between a punch and a die for press processing. In addition, regarding heating of a plate-shaped workpiece, it is also known that a predetermined current is passed through the plate-shaped workpiece and the plate-shaped workpiece is electrically heated by energization heating using this current.

For example, Patent Document 1 intends to easily obtain a super-high-strength press-molded product having a good shape accuracy by uniformly heating a blank of various shapes to a high temperature range, and attaching electrodes to both ends of the blank. A method and apparatus for hot pressing a metal plate that adjusts the temperature distribution of a blank by adjusting the power supplied to the electrode for each electrode is disclosed.
JP 2002-248525 A

  In recent years, for example, plate-like workpieces used for automobile steel plates and the like have been required to use plate-like workpieces having high strength in order to reduce the weight of the vehicle body and increase the strength. As such a plate-like workpiece having high strength, there is one that is heated to a quenching temperature before pressing to improve its workability, and is hardened by contacting with a mold during pressing to increase its strength. Are known.

  However, in a plate-shaped workpiece having a hardenability that increases its strength by quenching during pressing, the plate-shaped workpiece is pressed and hardened, and then pressed from the pressed plate-shaped workpiece. When plastic working such as blanking is performed, the plastic working can be very difficult.

  Therefore, the present invention has been made in view of the above technical problem, and in a plate-like workpiece having hardenability, the workability of the plate-like workpiece can be improved and quenched, and the blanking property is improved. It aims at providing the processing method and processing apparatus of the plate-shaped workpiece which can suppress being damaged.

  For this reason, the processing method of the plate-shaped workpiece | work which concerns on Claim 1 of this application is a processing method of the plate-shaped workpiece | work which processes a plate-shaped workpiece | work using a shaping | molding die, Comprising: The step which prepares a plate-shaped workpiece | work, An electrode that is spaced apart from each other is brought into contact with the plate-shaped workpiece and energized, and the plate-shaped workpiece is linearly connected between the contact areas in contact with the electrode, and is located outside the inner region that is heated by energization. Forming a peripheral edge region that is a peripheral edge of the plate-shaped workpiece, and heating only the inner region to a quenching temperature by energization; and after the inner region is heated to the quenching temperature, the plate-shaped workpiece is A step of processing the plate-shaped workpiece into a predetermined shape by cooling the plate-shaped workpiece with the molding die and quenching the internal region; and processing the plate-shaped workpiece into a predetermined shape After serial interior area is hardened, it is obtained by said that a step of blanking the plate-shaped workpiece comprises at least part of the peripheral area.

  The invention method according to claim 2 of the present application is the invention method according to claim 1, wherein the peripheral region of the blanked plate-like workpiece is welded after the plate-like workpiece is blanked. It is characterized by that.

  Furthermore, the invention method according to claim 3 of the present application is characterized in that in the invention method according to claim 1 or 2, the plate workpiece is a steel plate having a tensile strength of 600 MPa or more.

  Still further, a plate workpiece processing apparatus according to claim 4 of the present application is a plate workpiece processing apparatus that processes a plate workpiece using a mold, and has electrodes spaced apart from each other. By energizing the plate-shaped workpiece in contact with the plate-shaped workpiece, the contact area where the electrodes are in contact with the plate-shaped workpiece is linearly connected, and the inner region heated by energization is positioned outside the inner region, and An energizing means for forming a peripheral edge region that is a peripheral edge of the plate-shaped workpiece and heating only the inner region to a quenching temperature, and the inner portion processed into the predetermined shape and heated to the quenching temperature. A mold for cooling the plate-like workpiece so as to quench the region, and a blanking means for blanking the plate-like workpiece including at least a part of the peripheral region. It is intended.

  According to the processing method of the plate-like workpiece according to claim 1 of the present application, the inner region of the plate-like workpiece is processed by the forming die while being heated, and is cooled including the peripheral region that is not quenched after the processing. By ranking, the workability of the plate-like workpiece can be improved and quenched, and the blanking property can be prevented from being impaired.

  Moreover, according to the invention method of claim 2 of the present application, after the plate-like workpiece is blanked, the peripheral portion region of the blanked plate-like workpiece is welded, so that the peripheral portion region is not quenched. By welding, it is possible to obtain good weldability of the plate-like workpiece and to improve delayed fracture resistance of the welded portion.

  Furthermore, according to the invention method according to claim 3 of the present application, the plate-like workpiece is a steel plate having a tensile strength of 600 MPa or more, so that the plate-like workpiece that is difficult to work with a forming die has its workability. It is possible to improve the above-mentioned effects more effectively.

  Furthermore, according to the processing apparatus of the plate-shaped workpiece which concerns on Claim 4 of this application, while processing the internal area | region of a plate-shaped workpiece with the shaping | molding die, it cools and the peripheral part area | region which is not quenched after a process is carried out. By including and blanking, the workability of the plate-like workpiece can be improved and quenched, and the blanking performance can be prevented from being impaired.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic explanatory view showing a processing apparatus for a plate workpiece according to the first embodiment, FIG. 2 is a side explanatory view of the processing apparatus viewed from the A1 direction in FIG. 1, and FIG. 4 is a schematic explanatory view showing the processing apparatus according to the first embodiment in a state in which the lowering is performed, FIG. 4 is a side explanatory view of the processing apparatus viewed from the A1 direction in FIG. 3, and FIG. 5 is the first embodiment. It is explanatory drawing for demonstrating the process of the plate-shaped workpiece processed with the said processing apparatus which concerns on a form.

  As shown in FIG. 1, the processing apparatus 1 is a processing apparatus for processing a plate-shaped workpiece (blank) W1 formed in a substantially flat plate shape, and includes a punch 10 provided so as to be movable up and down, and the punch. 10 is provided with a molding die 30 having a die 20 arranged so as to face the die 10, and the molding die 30 is provided on the punch 10 and provided on the die 20 and a protruding portion 11 projecting downward. By combining the concave portion 21 formed in a concave shape corresponding to the protruding portion 11, the plate-like workpiece W <b> 1 has a cross-sectional hat shape (a shape in which a flange-like portion projecting outward is integrally formed at both ends of the U-shaped cross section. ).

  In the processing apparatus 1, the punch 10 is attached to the punch plate 14 via the spring 12 and the spring guide 13, and the punch plate 14 is attached to the punch holder 15. On the other hand, the die 20 is attached to the die holder 22. In the processing apparatus 1, the outer guide 35 fixed to the die holder 22 is incorporated in the outer guide bush 36 provided in the punch holder 15, and the inner guide 37 fixed to the punch plate 14 is attached to the punch 10. The inner guide bush 16 provided and the inner guide bush 23 provided on the die 20 are incorporated, and the positioning accuracy between the punch 10 and the die 20 is ensured.

  Further, the processing apparatus 1 is provided with a vertical movement means (not shown) that is connected to the punch holder 15 and moves the punch holder 15 in the vertical direction. Since the punch 10 is attached to the punch holder 15 via the spring guide 13 and the punch plate 14, the punch 10 moves in the vertical direction when the punch holder 15 is moved in the vertical direction by the vertical movement means. Is done.

  As shown in FIG. 2, the processing apparatus 1 according to the present embodiment also includes energization means 40 for electrically heating the plate-like workpiece W <b> 1 disposed on the die 20. The energizing means 40 includes two electrodes 41 that are separated from each other, a power source 42 that supplies power to the electrode 41, and a cable 43 that connects the power source 42 and the electrode 41, and each electrode 41 contacts the plate-like workpiece W1. The plate-like workpiece W1 is heated by Joule heat generated between the electrodes 41 when energized.

  When the electrode 41 is connected to an electrode moving means (not shown) for moving the electrode 41 in the vertical direction, as shown by an arrow Z1, the electrode moving means is arranged when the plate-like workpiece W1 is arranged on the die 20. Alternatively, when removing the plate-like workpiece W1 from the die 20, the electrode 41 is moved upward, and when energizing between the electrodes 41, the electrode 41 is brought into contact with the plate-like workpiece W1 arranged on the die 20. Is configured to move downward.

  In addition, the said processing apparatus 1 measures the temperature of internal area | region S2 of the plate-shaped workpiece W1 mentioned later, when heating the plate-shaped workpiece W1 by the electricity supply means 40 as another structure, for example, temperature measurement, such as a temperature sensor Means (not shown) and a control unit (not shown) for controlling the operation of the up-and-down direction moving means, the energizing means 40, the electrode moving means, and the like. The control unit preferably includes a microcomputer. It is configured as the main part.

  When pressing the plate-like workpiece W1 using the processing apparatus 1, first, after the plate-like workpiece W1 is arranged at a predetermined position on the die 20, the electrode 41 is moved downward by the electrode moving means. It is moved and brought into contact with the plate-like workpiece W1. And between the electrodes 41 is energized by the energizing means 40, and the plate-like workpiece W1 is heated.

FIG. 5A is an explanatory top view showing a plate-like workpiece to be processed using the processing apparatus according to the first embodiment, and FIG. 5B shows an electrode on the plate-like workpiece. It is explanatory drawing for demonstrating the state contacted.
As described above, the blank formed in a substantially flat plate shape is used as the plate workpiece W1, and the plate workpiece W1 is formed in a substantially rectangular shape as shown in FIG. In addition, as a plate-shaped workpiece | work, the steel plate which has hardenability is used, For example, the high strength steel plate which has the tensile strength of 600 Mpa or more can be used.

  In the present embodiment, each of the two electrodes 41 that are separated from each other has a contact portion (not shown) that comes into contact with the plate-like workpiece W1, and this contact portion has a predetermined area and is formed in a substantially rectangular shape. ing. When the electrode 41 is brought into contact with the plate-like workpiece W1, as shown in FIG. 5B, the electrode 41 is brought into contact with the plate-like workpiece W1 in the vicinity of both ends in the longitudinal direction of the plate-like workpiece W1. A contact area (area surrounded by a broken line) S1 is formed.

  When the electrode 41 is brought into contact with the plate-like workpiece W1 and the electrode 41 is energized by the energizing means 40, the plate-like workpiece W1 is linearly connected between the contact areas S1 with which the electrode 41 is contacted, and between the contact areas S1. The internal area S2 (area with hatched areas) located inside is heated. This energization is performed so that the inner region S2 of the plate-like workpiece W1 is heated to the quenching temperature, that is, the inner region S2 of the plate-like workpiece W1 is heated to a temperature equal to or higher than the transformation point of the steel. Heating is performed until the structure becomes an austenite structure. This energization is performed so that the peripheral region S3, which is located on the outer side of the internal region S2, includes the contact region S1, and is the peripheral portion of the plate-like workpiece W1, does not reach the quenching temperature.

  When the internal region S2 of the plate-like workpiece W1 is heated to the quenching temperature, the punch 10 is moved downward, and the plate-like workpiece W1 is pressed by the punch 10 and the die 20 as shown in FIGS. The As shown in FIG. 4, the electrode 41 may be in contact with the plate-like workpiece W1 when the plate-like workpiece W1 is pressed, or may be separated from the plate-like workpiece W1 by the electrode moving means. .

FIG. 5C is an explanatory top view showing the pressed plate workpiece. In FIG. 5C, the inner region S2 is hatched.
As described above, the molding die 30 is configured to mold the internal region S2 of the plate-like workpiece W1 into a cross-sectional hat shape, and the molding die 30 allows the inner region S2 of the plate-like workpiece W1 to be a bottom surface portion. The cross section which has 50 and the side part 51, and crosses the longitudinal direction of the plate-shaped workpiece W1 is shape | molded by the cross-sectional hat shape.

  In addition, the molding die 30 molds the plate-like workpiece W1 into a cross-sectional hat shape, cools the plate-like workpiece W1, and quenches the internal region S2 of the heated plate-like workpiece W1. Thereby, only the inner region S2 of the plate-like workpiece W1 is quenched without quenching the peripheral region S3.

  In the present embodiment, after the plate-shaped workpiece W1 is molded by the molding die 30 and the internal region S2 is quenched, the plate-shaped workpiece W1 is blanked to include at least a part of the peripheral region S3. Specifically, the region S4 located outside the blank line L1 is cut out. The processing apparatus 1 includes blanking means (not shown) such as a blanking type for blanking the plate-like workpiece W1, and the plate-like workpiece W1 is blanked into a predetermined shape by the blanking means. .

6 is a perspective view showing a plate-like workpiece blanked after press working, and FIG. 7 is a cross-sectional explanatory view taken along line Y7-Y7 in FIG.
As described above, the blanked plate-like workpiece W1 includes the flange portion 52 and is formed in a cross-sectional hat shape as shown in FIG. Moreover, as for plate-shaped workpiece W1, the bottom face part 50 and the side part 51 are hardened, and the flange part 52 which is peripheral part area | region S3 is not hardened.

  FIG. 8 is an explanatory diagram for explaining a product having the plate-like workpiece. The plate-like workpiece W2 shown in FIG. 8 is processed in substantially the same manner as the plate-like workpiece W1, has a flange portion 62 that is not quenched, a quenched upper surface portion 60, and a side surface portion 61, and has a cross-sectional hat shape. Is formed.

  As shown in FIG. 8, the plate-like workpiece W1 has the flange portion 52 of the plate-like workpiece W1 overlapped with the flange portion 62 of the plate-like workpiece W2, and the flange portion 52 and the flange portion 62 are, for example, spot welded or the like. Welded by. Thereby, the product in which the plate-like workpiece W1 and the plate-like workpiece W2 are joined includes a hollow closed cross-section portion 70 and a flange portion 71 extending outward from the closed cross-section portion 70. A plurality of welds 72 are formed.

  For example, in a plate-like workpiece used as a steel plate for automobiles, after being pressed, it may be joined to another plate-like workpiece by welding such as spot welding, but in a plate-like workpiece having high strength, Since the stress at the joint is high, it is difficult to obtain good weldability, and cracks and delayed fracture may occur in the weld. However, in the processing of the plate-like workpiece according to the present embodiment, such a problem can be avoided by welding the non-quenched peripheral region S3 of the plate-like workpiece W1.

In the processing apparatus 1, electrodes are arranged at both ends in the longitudinal direction of the plate-like workpiece W1, but electrodes may be arranged at both ends in the short direction of the plate-like workpiece.
FIG. 9 is a schematic explanatory view showing a processing apparatus for a plate-like workpiece according to the second embodiment, FIG. 10 is a side explanatory view of the processing apparatus as seen from the A2 direction in FIG. 9, and FIG. FIG. 12 is a schematic side view of the processing apparatus as viewed from the direction A2 in FIG. 11. FIG. 12 is a schematic explanatory view showing the processing apparatus according to the second embodiment in the finished state. In these drawings, components having the same configuration as the processing apparatus 1 described above and having the same functions are denoted by the same reference numerals, and further description thereof is omitted.

  Moreover, FIG. 13 is explanatory drawing for demonstrating the processing process of the plate-shaped workpiece processed with the said processing apparatus which concerns on 2nd Embodiment, (a) of FIG. 13 is 2nd Embodiment. FIG. 13B is an explanatory diagram for explaining a state in which an electrode is in contact with the plate-like workpiece, and FIG. c) is a top view illustrating the pressed plate-like workpiece. Also in the processing device 80 according to the second embodiment, as shown in FIG. 13A, a blank formed in a substantially rectangular shape is used as the plate-like workpiece W10. In the processing device 80, the plate-like workpiece W10 is used. The electrodes are in contact with the vicinity of both ends in the short direction.

  The processing device 80 has substantially the same configuration as the processing device 1, but two electrodes 46 that are separated from each other are provided in the vicinity of both ends in the short direction of the plate-like workpiece W10. When the electrode 46 is moved downward by the vertical movement means and comes into contact with the plate-like workpiece W10, as shown in FIG. 13B, the plate-like workpiece W10 has a short side of the plate-like workpiece W10. Contact regions (regions surrounded by broken lines) S11 with which the electrodes 46 are in contact are formed in the vicinity of both ends in the direction.

  When the electrode 46 is brought into contact with the plate-like workpiece W10, the energization means 45 energizes between the electrodes 46, and this energization heats an internal region (region hatched with hatching) S12 located between the electrodes 46. Is done. This energization is performed until the internal region S12 reaches the quenching temperature, but the peripheral region S13 that is located outside the internal region S12 and includes the contact region S11 and is the peripheral portion of the plate-like workpiece W10 is heated to the quenching temperature. It has not been.

  When only the inner region S12 of the plate-like workpiece W10 is heated to the quenching temperature, it is pressed into a cross-sectional hat shape by the molding die 30 as shown in FIG. 11 and FIG. W10 is cooled and the inner region S12 is quenched.

  As with the plate-like workpiece W1 shown in FIG. 6, the plate-like workpiece W10 includes a flange portion 92 corresponding to the non-quenched peripheral edge region S13, and a bottom surface portion 90 and a side surface portion 91 corresponding to the quenched internal region S12. And has a cross-sectional hat shape. In the processing apparatus 80, the electrode 46 is separated from the plate-like workpiece W10 during the press working, but the electrode may be in contact with the plate-like workpiece.

  In the processing apparatus 80, when the plate-like workpiece W10 is heated by the energizing means 45, the electrodes 46 are arranged along the longitudinal direction of the plate-like workpiece W10. Therefore, the electrodes are arranged along the short direction of the plate-like workpiece W1. Compared to the case of the processing apparatus 1 in which 41 is disposed, the cross-sectional area during energization can be increased, and the plate-like workpiece can be heated at a predetermined temperature faster.

  In addition, although not shown in figure, the plate-shaped workpiece | work W10 after press work is blanked including at least one part of peripheral part area | region S13. This blanking is preferably performed in the peripheral region S13 that has not been quenched. In the blanked plate-like workpiece W10, the peripheral region S13 that has not been quenched is welded to another member.

  In the present embodiment, the plate-like workpieces W1 and W10 are bent into a cross-sectional hat shape by the forming die 30, but other shapes such as bending or drawing, plastic processing, or punching or trimming shearing. A mold for performing the above can be used. Further, the electrodes 41 and 46 that are spaced apart from each other are disposed in the vicinity of both end portions of the plate-like workpieces W1 and W10. The electrodes are brought into contact with the plate-like workpiece corresponding to the portion of the plate-like workpiece that requires high strength. be able to.

  Thus, according to the processing method of the plate-shaped workpiece according to the present embodiment, the inner regions S2 and S12 of the plate-shaped workpieces W1 and W10 are processed and cooled by the forming die 30 in a heated state, and quenched after the processing. By blanking including the peripheral edge regions S3 and S13, the workability of the plate-like workpiece can be improved and quenched, and the blanking property can be prevented from being impaired.

  Moreover, after the plate-like workpiece W1 is blanked, the peripheral portion region S3 of the blanked plate-like workpiece W1 is welded so that the non-quenched peripheral portion region is welded to improve the plate-like workpiece. Weldability can be obtained, and the delayed fracture resistance of the welded portion can be improved.

  Furthermore, since the plate-like workpiece W1 is a steel plate having a tensile strength of 600 MPa or more, it is possible to improve the workability in a plate-like workpiece that is difficult to process with a forming die, and the above effect is more effective. Can play.

  Furthermore, according to the processing apparatuses 1 and 80 according to the present embodiment, the peripheral portion that is processed and cooled by the mold 30 while the internal regions of the plate-like workpieces W1 and W10 are heated and is not quenched after the processing. By blanking including the regions S3 and S13, the workability of the plate-like workpiece can be improved and quenched, and the blanking property can be prevented from being impaired.

Next, a description will be given of a case where the plate-like workpiece machining method as described above is applied to the machining of a vehicle body constituent member of an automobile.
FIG. 14 is a schematic explanatory view schematically showing a vehicle body structure of an automobile. This specific example is applied to a passenger compartment component of the vehicle body 110. The center pillar reinforcement 120 is provided in the center pillar 115 and reinforces the center pillar 115 (see FIG. 15), a door (not shown). ) Applying the plate workpiece processing method described above to each of the door impact bar 140 that is provided inside and reinforces the door impact bar 140 that reinforces the door and the roof reinforcement 160 that reinforces the roof panel 155 that forms the upper part of the passenger compartment. To be processed.

  FIG. 15 is a perspective view showing a center pillar reinforcement, and FIGS. 16 and 17 are explanatory views for explaining a processing step in which the center pillar reinforcement is processed from a blank, and FIG. FIG. 16B is an upper surface explanatory view showing a center pillar reinforcement molding blank, and FIG. 16B is an upper surface explanatory view for explaining the arrangement of electrodes in contact with the center pillar reinforcement blank. 16 (c) is an explanatory top view showing an internal region heated by an electrode in contact with the center pillar reinforcement forming blank, and FIG. 17 (a) is the center pillar reinforcement subjected to press working. FIG. 17B is an upper surface explanatory view showing a center pillar reinforcement, Of 17 (c) is a top explanatory view showing the welding site in the center pillar reinforcement.

  The center pillar reinforcement 120 is disposed between the center pillar inner and the center pillar outer. As shown in FIG. 15, the center pillar reinforcement 120 is formed in a substantially T shape and has an upper and lower portion 121 extending in the vertical direction of the vehicle body. And a horizontal portion 122 that extends in the horizontal direction at the upper end of the upper and lower portions 121.

  Further, the center pillar reinforcement 120 is molded so as to bulge toward the center side from the flange portion 123 joined to the center pillar inner and the center pillar outer, and the side portion extends at an angle from the flange portion 123. 124 and an upper surface portion 125, and the upper surface portion 125 is provided with a hole 126 for attaching a seat belt bracket.

  The center pillar reinforcement 120 is molded from a blank W20 cut into a substantially rectangular shape, as shown in FIG. The blank W20 is brought into contact with the vicinity of both ends in the longitudinal direction of the blank W20 using the processing apparatus according to this embodiment, and the electrode is brought into contact with the blank W20 as shown in FIG. A contact region S21 is formed.

  After the electrodes are brought into contact with the blank W20, by energizing the electrodes, the internal region S22 located inside the contact regions S21 is heated as shown in FIG. This energization is performed until the internal region S22 reaches the quenching temperature. Note that the peripheral area S23 located outside the internal area S22 is not heated to the quenching temperature.

  Then, when the internal region S22 of the blank W20 reaches the quenching temperature, as shown in FIG. 17A, the blank W20 is pressed so as to have the shape of the center pillar reinforcement 120, and the internal region S22. (A hatched area) is quenched. In the blank W20, a flange portion 123, a side surface portion 124, an upper surface portion 125, and a hole portion 126 are formed, and a region S24 located outside the two-dot chain line L2 shown in FIG. The side surface portion 124 and the upper surface portion 125 corresponding to the inner region S22 are quenched. Moreover, the blank W20 is provided with the edge part 128 removed by the blanking mentioned later on the outer side of the flange part 123, and the flange part 123 and the edge part 128 are not hardened in the case of press work.

  After the press working, blanking is performed, the edge 128 is removed, and the center pillar reinforcement 120 is formed from the blank W20 as shown in FIG. In the center pillar reinforcement 120, the flange portion 123 hatched in FIG. 17C is welded together with the center pillar inner and the center pillar outer.

  In the processing of the center pillar reinforcement 120, it is possible to suppress the blanking performance from being impaired by blanking the edge portion 128 that is not quenched after the press working. Moreover, the strength can be increased by quenching the side surface portion 124 and the upper surface portion 125 during the molding process. Further, the flange portion 123 can be molded without quenching, and good weldability can be obtained when the flange portion 123 is welded to another member.

  18 is a perspective view showing a door impact bar, FIGS. 19 and 20 are explanatory views for explaining a processing step in which the door impact bar is processed from a blank, and FIG. FIG. 19B is a top view for explaining the arrangement of electrodes in contact with the door impact bar forming blank, and FIG. FIG. 20A is an upper surface explanatory view showing an inner region heated by an electrode in contact with the door impact bar forming blank, and FIG. 20A is an upper surface explanatory view showing the pressed door impact bar forming blank. (B) of FIG. 20 is an upper surface explanatory view showing a door impact bar, and FIG. 20 (c) is an upper surface explanatory view showing a welding construction site in the door impact bar.

  The door impact bar 140 is disposed between the door outer panel and the door inner panel, and is attached to the door outer panel. As shown in FIG. 18, the flange portion 141, the side surface portion 142, and the upper surface portion 143 are provided. And is formed so as to bulge from the flange portion 141 toward the center side, and is formed in a substantially cross-sectional hat shape.

  As shown in FIG. 19A, the door impact bar 140 is molded from a blank W40 cut into a substantially rectangular shape. The blank W40 is brought into contact with the vicinity of both ends in the longitudinal direction of the blank W40 using the processing apparatus according to the present embodiment, and the electrode is brought into contact with the blank W40 as shown in FIG. A contact region S41 is formed.

  After the electrodes are brought into contact with the blank W40, the internal region S42 located inside the contact regions S41 is heated as shown in FIG. 19C by energizing the electrodes. This energization is performed until the internal region S42 reaches the quenching temperature. Note that the peripheral area S43 located outside the internal area S42 is not heated to the quenching temperature.

  When the inner region S42 of the blank W40 reaches the quenching temperature, as shown in FIG. 20A, the blank W40 is pressed so as to have the shape of the door impact bar 140 by the forming die, and the inner region S42 (hatched line). The hatched area) is quenched. In the blank W40, the flange portion 141, the side surface portion 142, and the upper surface portion 143 are formed, and the flange portion 141, the side surface portion 142, and the upper surface portion 143 corresponding to the inner region S42 are quenched. Moreover, the blank W40 is provided with the edge part 144 removed by blanking mentioned later on the outer side of the flange part 141, and the edge part 144 is not hardened in the case of press work.

  Next, blanking is performed, the edge portion 144 shown in FIG. 20A is removed, and the door impact bar 140 is formed from the blank W40 as shown in FIG. 20B. This door impact bar 140 is a part of a non-quenched peripheral edge region S43, and regions S44 located at both ends in the longitudinal direction of the door impact bar 140 hatched with hatching in FIG. Welded with outer panel.

  In the processing of the door impact bar 140, it is possible to suppress the blanking performance from being impaired by blanking the edge portion 144 that is not quenched after the press processing. Moreover, the strength can be increased by quenching the flange portion 141, the side surface portion 142, and the upper surface portion 143 corresponding to the inner region S42 during the molding process. Furthermore, the region S44 located at both ends in the longitudinal direction of the door impact bar 140 can be molded without quenching, and good weldability can be obtained when the region S44 is welded to other members. it can.

  FIG. 21 is a perspective view showing the roof reinforcement, FIGS. 22 and 23 are explanatory views for explaining a processing step in which the roof reinforcement is processed from a blank, and FIG. FIG. 22B is a top view illustrating the roof reinforcement molding blank. FIG. 22B is a top view illustrating the arrangement of electrodes in contact with the roof reinforcement molding blank. FIG. ) Is an upper surface explanatory view showing an internal region heated by an electrode in contact with the roof reinforcement molding blank, and FIG. 23A shows the pressed roof reinforcement molding blank. FIG. 23B is a top view illustrating the roof reinforcement, and FIG. 23C is the roof reinforcement. It is a top explanatory view showing the welding site in cement.

  The roof reinforcement 160 is attached to the roof panel 155 constituting the upper part of the passenger compartment and reinforces the roof panel 155. As shown in FIG. 21, the roof reinforcement 160 is formed in a substantially rectangular shape and forms a peripheral portion thereof. An edge portion 161, side surface portions 162 and 163, and an upper surface portion 164 are provided, and are formed so as to bulge from the edge portion 161 toward the center side. Further, the roof reinforcement 160 has an end portion 165 on the outer side in the short direction of the edge portion 161 formed in a concave-convex shape, and a notch portion 167 that is recessed inwardly at an end portion 166 in the longitudinal direction of the edge portion 161. Is formed.

  As shown in FIG. 22A, the roof reinforcement 160 is formed from a blank W60 cut into a substantially rectangular shape. The blank W60 is brought into contact with the vicinity of both ends in the longitudinal direction of the blank W60 using the processing apparatus according to the present embodiment, and the electrode is brought into contact with the blank W60 as shown in FIG. A contact region S61 is formed.

  After the electrodes are brought into contact with the blank W60, the internal region S62 located inside the contact region S61 is heated by energizing the electrodes as shown in FIG. This energization is performed until the internal region S62 reaches the quenching temperature. The peripheral area S63 located outside the internal area S62 is not heated to the quenching temperature.

  When the internal region S62 of the blank W60 reaches the quenching temperature, as shown in FIG. 23A, the blank W60 is pressed to have the shape of the roof reinforcement 160 by the mold, and the internal region S62 ( The hatched area is quenched. In the blank W60, the side surface portions 162 and 163 and the upper surface portion 164 are formed, and the edge portion 161, the side surface portions 162 and 163, and the upper surface portion 164 corresponding to the internal region S62 are quenched.

  Next, blanking is performed, and as shown in FIG. 23 (b), the outer end 165 of the edge 161 extending along the longitudinal direction of the blank W60 is formed in an uneven shape, and the blank W60. Notches 167 are formed at both ends 166 in the longitudinal direction, and a roof reinforcement 160 is formed from the blank W60. The roof reinforcement 160 is a part of the non-quenched peripheral edge region S63, and is a region located at both ends 166 in the longitudinal direction of the roof reinforcement 160 hatched in FIG. S64 is welded to the roof panel.

  In the processing of the roof reinforcement 160, it is possible to suppress the blanking property from being impaired by blanking the edge portion 161 that is not quenched after the press processing. Further, the edge portion 161, the side surface portions 162 and 163, and the upper surface portion 164 corresponding to the inner region S62 are quenched at the time of the molding process, so that the strength can be increased. Further, the region S64 located at both ends 166 in the longitudinal direction of the roof reinforcement 160 can be molded without quenching, and good weldability is obtained when the region S44 is welded to other members. be able to.

  In the processing of the plate workpiece according to the present embodiment, two electrodes are used to heat the plate workpiece (blank). In order to form a plurality of quenched portions on the plate workpiece, You may make it provide an electrode corresponding to a hardening part, respectively.

  As described above, the present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention.

  The present invention is a processing method and processing apparatus for a plate-like workpiece that can improve the workability of the plate-like workpiece and can be quenched, and can suppress the deterioration of the blanking property, particularly for automobiles. The present invention can be effectively applied in the processing of high-tensile steel plates used for vehicle body components.

It is a schematic explanatory drawing which shows the processing apparatus of the plate-shaped workpiece | work which concerns on 1st Embodiment. It is side surface explanatory drawing of the said processing apparatus seen from A1 direction in FIG. It is a schematic explanatory drawing which shows the said processing apparatus which concerns on 1st Embodiment in the state which the punch fell. It is side surface explanatory drawing of the said processing apparatus seen from A1 direction in FIG. It is explanatory drawing for demonstrating the process of the plate-shaped workpiece processed with the said processing apparatus which concerns on 1st Embodiment. It is a perspective view which shows the plate-shaped workpiece blanked after press work. FIG. 7 is a cross-sectional explanatory view taken along line Y7-Y7 in FIG. It is explanatory drawing for demonstrating the product which has the said plate-shaped workpiece. It is a schematic explanatory drawing which shows the processing apparatus of the plate-shaped workpiece which concerns on 2nd Embodiment. It is side surface explanatory drawing of the said processing apparatus seen from A2 direction in FIG. It is a schematic explanatory drawing which shows the said processing apparatus which concerns on 2nd Embodiment in the state which the punch fell. It is side surface explanatory drawing of the said processing apparatus seen from A2 direction in FIG. It is explanatory drawing for demonstrating the manufacturing process of the plate-shaped workpiece processed with the said processing apparatus which concerns on 2nd Embodiment. It is a schematic explanatory drawing which shows roughly the vehicle body structure of a motor vehicle. It is a perspective view showing a center pillar reinforcement. It is explanatory drawing for demonstrating the manufacturing process in which a center pillar reinforcement is processed from a blank. It is explanatory drawing for demonstrating the manufacturing process in which a center pillar reinforcement is processed from a blank. It is a perspective view which shows a door impact bar. It is explanatory drawing for demonstrating the manufacturing process in which a door impact bar is processed from a blank. It is explanatory drawing for demonstrating the manufacturing process in which a door impact bar is processed from a blank. It is a perspective view which shows a roof reinforcement. It is explanatory drawing for demonstrating the manufacturing process in which a roof reinforcement is processed from a blank. It is explanatory drawing for demonstrating the manufacturing process in which a roof reinforcement is processed from a blank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,80 Processing apparatus 30 Mold 40, 45 Current supply means 41, 46 Electrode S1, S11, S21, S41, S61 Contact area S2 S12, S22, S42, S62 Inner area S3 S13, S23, S43, S63 Peripheral area W1 , W10, W20, W40, W60

Claims (4)

It is a processing method of a plate-shaped workpiece that processes a plate-shaped workpiece using a mold,
Preparing a plate workpiece;
The plate-like workpiece is brought into contact with electrodes spaced apart from each other and energized, and the plate-like workpiece is linearly connected between contact areas where the electrodes are in contact with the inner region heated by energization and outside the inner region. Forming a peripheral region that is positioned and a peripheral portion of the plate-like workpiece, and heating only the inner region to a quenching temperature by energization; and
After the inner region is heated to the quenching temperature, processing the plate-shaped workpiece into a predetermined shape with the mold and cooling the plate-shaped workpiece with the mold to quench the inner region;
Blanking the plate-shaped workpiece including at least a part of the peripheral region after the plate-shaped workpiece is processed into a predetermined shape and the inner region is quenched; and
A processing method for a plate-like workpiece, comprising:   The method for processing a plate-like workpiece according to claim 1, wherein the peripheral region of the blanked plate-like workpiece is welded after the plate-like workpiece is blanked.   The plate-like workpiece processing method according to claim 1, wherein the plate-like workpiece is a steel plate having a tensile strength of 600 MPa or more. A processing device for a plate-shaped workpiece that processes a plate-shaped workpiece using a mold,
An internal structure that has electrodes that are spaced apart from each other and that is heated by energization by connecting the electrodes to the plate-like workpiece in a straight line between the contact areas where the electrodes are in contact with the plate-like workpiece. An energizing means for forming a region and a peripheral region that is a peripheral portion of the plate-like workpiece located outside the internal region and heating only the internal region to a quenching temperature;
A mold for processing the plate-like workpiece into a predetermined shape and cooling the plate-like workpiece so as to quench the internal region heated to a quenching temperature;
Blanking means for blanking the plate-like workpiece including at least a part of the peripheral area;
The processing apparatus of the plate-shaped workpiece characterized by comprising.

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