JP2016190269A - Hot press molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate demolding of a press-molded article by eliminating sticking of the article after molding to a molding tool while overall lessening the clearance between a plate material and a molding face to suppress uneven cooling of the plate material caused by the molding tool.SOLUTION: A hot press molding device is characterized by pressing a first sidewall outer surface molding tool 33 to a plate material in a mold closing state by moving to approach a sidewall inner surface molding face 20b of a lower mold 20 from a lateral side accompanying a mold closing operation, and by moving the first sidewall outer surface molding tool 33 to depart from the sidewall inner surface molding face 20b of the lower mold 20 to the lateral side accompanying a mold opening operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot press forming apparatus for press forming a heated metal plate material.

  For example, there are pillars, side sills, door impact bars, and the like as press-formed products for automobiles, and these are parts that require high strength, and thus can be obtained by hot-pressing a high-tensile steel plate. In hot press forming, after heating the steel plate to the quenching temperature, the steel plate is placed on the lower die and the upper die is lowered, and the upper die and the lower die are used to form the steel plate with the upper die and the lower die. Quenching is performed by cooling.

  The press-formed product as described above is often a hat-shaped part having a pair of side wall portions and a top wall portion extending so as to connect edges of the side wall portions. When press-molding a hat-shaped part, for example, as disclosed in Patent Documents 1 and 2, the upper surface of the lower mold is formed so as to bulge upward as a whole, and the side wall of the press-molded product It is comprised by the side wall part molding surface for shape | molding a part inner surface, and the top wall part shaping | molding surface for shape | molding the top wall part inner surface of a press molded product. On the other hand, the lower surface of the upper die is recessed upward so that the lower die can be inserted as a whole, and a side wall portion molding surface for molding the outer side surface of the press molded product, and the top wall of the press molded product It is comprised by the top wall part molding surface for shape | molding a part outer surface.

JP 2011-240373 A JP2013-233548A

  By the way, when forming a press-formed product with a hat-shaped cross section, the upper die is moved in a direction approaching the lower die. At this time, the top wall portion molding surface of the upper die and the lower die are moved. The top wall portion forming surface moves relative to each other in the direction of sandwiching the steel plates in the thickness direction. For this reason, after molding, the top wall forming surface does not bite into the steel plate when the mold is opened, and there is no need to consider the clearance between the top wall forming surface and the steel plate. Both the top wall portion molding surfaces of the mold can be pressed against the steel plate to cool the steel plate.

  On the other hand, the side wall part molding surface of the upper mold and the lower mold will finally move relative to the direction along the side wall part of the press-molded product in the latter half of the molding, for example, between the side wall part molding surfaces of the upper mold, The press-molded product is fitted between the molding surfaces on both side walls of the lower mold. Therefore, depending on the dimensional change of the steel plate before and after quenching, there is a risk that the press-formed product will bite into the upper die and the lower die, making it difficult to remove the mold. It is necessary to set the shape so as to provide a clearance for suppressing biting.

  In other words, the top wall forming surface of the upper die and the lower die can be pressed against the steel plate without clearance, so that cooling of the portion of the steel plate where the top wall forming surface is pressed is promoted by the upper die and the lower die. In addition, since the side wall forming surface has a clearance between the steel plate and the steel plate, the portion of the steel plate where the side wall forming surface comes into contact is difficult to be cooled. This causes uneven cooling of the steel plate, and the strength varies depending on the part. It becomes a press-molded product.

  The present invention has been made in view of such points, and the object thereof is to reduce the overall clearance between the plate material and the molding surface while suppressing uneven cooling of the plate material by the molding die, The object of the present invention is to facilitate the demolding by eliminating the biting of the press-molded product into the mold after the molding.

  In order to achieve the above object, in the present invention, a mold for forming the outer surface of the side wall portion of the press-molded product can be moved to the side of the side wall portion.

The first invention is
In a hot press molding apparatus for press-molding a heated metal plate material to obtain a press-molded product having a side wall portion and a top wall portion,
A first mold that is switched between a mold open state and a mold closed state in contact with and away from each other; and a second mold
The first mold is formed with a first side wall inner surface molding surface for molding the inner side wall surface of the press-molded product and a top wall inner surface molding surface for molding the top wall inner surface.
The second molding die is formed with a top wall portion outer surface molding die on which a molding surface for molding the outer surface of the top wall portion of the press molded product is formed, and a molding surface for molding the outer surface of the side wall portion of the press molded product. A first side wall portion outer surface mold,
The first side wall portion outer surface molding die is moved so as to approach the first side wall portion inner surface molding surface of the first molding die from the side along with the mold closing operation, and pressed against the plate material in the mold closed state. The mold drive unit is further provided to move away from the plate material to the side of the first side wall portion inner surface molding surface of the first molding die in accordance with the mold opening operation.

  According to this configuration, when the first molding die and the second molding die approach each other by the mold closing operation when the plate material is molded, the top wall portion inner surface molding surface of the first molding die and the top wall of the second molding die. The molding surface of the external mold is brought into contact with the plate material to form the plate material. Along with this mold closing operation, the first side wall portion outer surface molding die approaches the first side wall portion inner surface molding surface of the first molding die from the side and is pressed against the plate material to mold the plate material. Thereby, the press-molded product which has a side wall part and a top wall part is obtained.

  At the time of mold opening, the top wall portion inner surface molding surface of the first molding die and the molding surface of the top wall portion outer surface molding die of the second molding die are relatively moved away from each other, and the first side wall portion outer surface molding is performed. The mold moves away from the plate material to the side of the first side wall portion inner surface molding surface of the first molding die.

  Accordingly, when the mold is opened, the first side wall portion outer surface mold moves away from the side wall portion of the press-molded product after molding, so that the press-molded product is moved to the first mold or the second mold. It will not bite into the mold. Therefore, even if the clearance between the first mold and the second mold when the mold is closed and the plate material is minimized or almost eliminated, the press-molded product can be easily removed, so that the first mold and the second mold As a result, the plate material is uniformly cooled.

According to a second invention, in the first invention,
The first side wall portion inner surface molding surface of the first molding die is molded on one side wall portion inner surface of the press-molded product,
The first molding die is formed with a second side wall portion inner surface molding surface for molding the other side wall portion inner surface of the press-molded product,
In the first side wall portion outer surface molding die of the second molding die, a molding surface for molding one side wall portion outer surface of the press-molded product is formed,
The second mold has a second side wall outer surface mold on which a molding surface for molding the other side wall outer surface of the press-molded product is formed,
The mold drive unit moves the second side wall portion outer surface molding die so as to approach the second side wall portion inner surface molding surface of the first molding die from the side in accordance with the mold closing operation. While pressing against the plate material, the plate material is moved away from the plate material to the side of the inner surface of the second side wall portion of the first mold in accordance with the mold opening operation.

  According to this configuration, for example, when the press-molded product has a cross-sectional hat shape having a pair of side wall portions, one side wall portion outer surface of the press-molded product is molded by the first side wall portion outer surface molding die, and the press-molded product The other outer surface of the side wall is formed by the second side wall outer surface mold. When the mold is opened, the first side wall portion outer surface mold is separated from the plate material to the side of the first side wall portion inner surface molding surface of the first molding die, and the second side wall portion outer surface mold is moved from the plate material to the first molding die. Since the second side wall portion is separated to the side of the inner surface of the inner surface of the second side wall portion, the press-molded product does not bite into the first mold or the second mold even if it is a hat-shaped press-molded product. . Therefore, even if the clearance between the first mold and the second mold when the mold is closed and the plate material is minimized or almost eliminated, the press-molded product can be easily removed, so that the first mold and the second mold As a result, the plate material is uniformly cooled.

According to a third invention, in the first or second invention,
The hot press molding apparatus includes a movable plate to which the second mold is attached, and the moving direction of the movable plate is a vertical direction,
The mold drive unit is configured to support the first side wall portion outer surface molding die so as to be movable in a horizontal direction with respect to the movable platen, and to contact the first side wall portion outer surface molding die to perform a mold closing operation and a mold. And a cam surface for moving the first side wall portion outer surface mold in the horizontal direction in accordance with the opening operation.

  According to this configuration, when the mold closing operation is performed by moving the movable platen, the cam surface comes into contact with the first side wall portion outer surface mold supported by the movable platen, and the first side wall portion outer surface mold is supported by the cam surface. Moves in the horizontal direction and approaches the inner surface of the first side wall of the first mold from the side. On the other hand, when the mold opening operation is performed, the first side wall portion outer surface mold is moved in the horizontal direction by the cam surface and moved away from the plate material to the side of the first side wall portion inner surface molding surface of the first mold. Therefore, by providing the cam surface, it is possible to move the first side wall portion outer surface mold using the moving force of the movable plate without providing a dedicated drive source for the first side wall portion outer surface mold. become. Furthermore, it is possible to reliably synchronize the movement of the movable platen and the movement of the first side wall portion outer surface mold.

According to a fourth invention, in the third invention,
The cam surface is formed by an inclined surface inclined at a predetermined angle with respect to a vertical line.

  According to this configuration, it is possible to accurately control the horizontal movement of the first side wall portion outer surface molding die while simply configuring the cam surface with the inclined surface.

According to a fifth invention, in any one of the first to fourth inventions,
The timing at which the top wall portion inner surface molding surface of the first molding die and the top wall portion outer surface molding die of the second molding die contact the plate material is such that the first side wall portion outer surface molding die contacts the plate material. It is set to be earlier than the timing.

  According to this configuration, when the mold is closed, the top wall portion inner surface molding surface of the first molding die and the top wall portion outer surface molding die of the second molding die are in contact with the plate material, and the plate material is sandwiched between both molding surfaces. Later, the first side wall portion outer surface mold comes into contact with the plate material. Therefore, the first side wall portion outer surface mold is fixed so that the plate material does not move before it contacts the plate material, so that the first side wall portion outer surface mold is accurately formed as intended. Is called.

A sixth invention is the second invention, wherein:
The first side wall portion outer surface molding die and the second side wall portion outer surface molding die are arranged so as to sandwich the top wall portion outer surface molding die.

  According to this configuration, since the top wall portion outer surface molding die is disposed between the first sidewall portion outer surface molding die and the second sidewall portion outer surface molding die, the first sidewall portion outer surface molding die and the second sidewall portion outer surface mold are disposed. The molding die and the top wall portion outer surface molding die can be integrated in a closed state to continuously form the press molded product from the top wall portion to the side wall portion.

  According to the first invention, the first side wall portion outer surface forming die for forming the side wall portion of the press-molded product is separated from the side wall portion of the press-molded product to the side of the side wall portion in accordance with the mold opening operation. Can be moved to. This reduces the overall clearance between the plate material and the molding surface and suppresses uneven cooling of the plate material due to the mold, while eliminating the biting of the press-molded product after molding into the mold. Can be easily.

  According to the second aspect of the invention, even if the press-formed product has a hat-shaped cross section, the press-formed product can be prevented from biting into the first mold or the second mold. Therefore, the cooling of the plate material can be made uniform by the first mold and the second mold.

  According to the third invention, the first side wall portion outer surface molding die attached to the movable platen is brought into contact with the cam surface and moved by the cam surface. The part outer surface mold can be moved, and the movement of the movable platen and the movement of the first side wall part outer surface mold can be reliably synchronized.

  According to the fourth aspect of the invention, the cam surface can be easily configured with an inclined surface, and the horizontal movement of the first side wall portion outer surface mold can be accurately controlled.

  According to the fifth aspect of the invention, the first side wall portion outer surface molding die has a timing when the top wall portion inner surface molding surface of the first molding die and the top wall portion outer surface molding die of the second molding die contact the plate material. Since it is earlier than the timing of contacting the plate material, the plate material can be fixed before the first side wall portion outer surface forming die contacts the plate material. Thereby, shaping | molding by a 1st side wall part outer surface shaping | molding die can be accurately performed as aimed.

  According to the sixth aspect of the invention, since the top wall portion outer surface molding die can be disposed between the first sidewall portion outer surface molding die and the second sidewall portion outer surface molding die, the first sidewall portion outer surface molding die and the second sidewall portion are arranged. The outer surface molding die and the top wall portion outer surface molding die can be integrated in a closed state to continuously form the press molded product from the top wall portion to the side wall portion.

It is a front view of the hot press molding apparatus which concerns on embodiment. It is a perspective view of the press-formed product shape | molded with the hot press molding apparatus. It is a figure which shows the press molding process by a hot press molding apparatus. 10 is a perspective view of a press-formed product according to Modification 1. FIG. FIG. 10 is a perspective view of a press-formed product according to Modification 2. FIG. 10 is a perspective view of a press-formed product according to Modification 3. It is a perspective view of the press-formed product which concerns on the modification 4. FIG. 10 is a perspective view of a press-formed product according to Modification 5. FIG. 10 is a perspective view of a press-formed product according to Modification 6. FIG. 10 is a perspective view of a press-formed product according to Modification 7. FIG. 10 is a perspective view of a press-formed product according to Modification 8.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a front view of a hot press molding apparatus 1 according to an embodiment of the present invention. The hot press molding apparatus 1 is used when manufacturing various parts such as automobile pillars, side sills, door impact bars and the like, and is a metal plate W (shown in FIG. 3) heated to a quenching temperature. ) Is press-molded so that a press-formed product 100 having a hat-shaped cross section as shown in FIG. 2 can be obtained.

  A press-formed product 100 formed by the hot press-forming apparatus 1 has a pair of side wall portions 101, 101 and a top wall portion 102 extending so as to connect the upper end portions of the side wall portions 101, 101. The lower side in 2 is open. The space | interval of the side wall parts 101 and 101 is set so that it may become so wide that it goes to an open | release side. Further, flanges 103 extending outward are formed at the lower ends of the side wall portions 101, respectively. In addition, the board | plate material W used as the press molded product 100 is a high-tensile steel plate etc., for example.

  As shown in FIG. 1, the hot press forming apparatus 1 includes a fixed platen 2, a movable platen 3, a driving device 4 that drives the movable platen 3, a lower die (first forming die) 20, and an upper die ( Second mold) 30. The fixed platen 2 extends substantially in the horizontal direction, and is fixed to, for example, the ground of a factory so as not to move. The movable platen 3 is disposed above the fixed platen 2 so as to face the fixed platen 2, and extends in a substantially horizontal direction like the fixed platen 2. The drive device 4 is composed of a fluid pressure cylinder device or the like disposed above the movable platen 3, and is for moving the movable platen 3 in the vertical direction. The drive device 4 can be configured by other than the fluid pressure cylinder device, and may have any structure that can move the movable platen 3.

  The lower die 20 is attached to the upper surface of the fixed platen 2, while the upper die 30 is attached to the lower surface of the movable platen 3. Therefore, when the movable platen 3 is moved upward by the driving device 4, the upper die 30 is separated from the lower die 20 to be in the mold open state, and when the movable platen 3 is moved downward by the driving device 4, the upper die 30 is Since the lower mold 20 approaches the lower mold 20, the lower mold 20 and the upper mold 30 are brought into contact with and separated from each other so as to be switched between the mold open state and the mold closed state.

  The upper surface of the lower die 20 is formed so as to bulge upward, and the upper end surface in the bulging direction is a top wall portion inner surface molding surface 20a for molding the inner surface of the top wall portion 102 of the press-formed product 100, and The side surface is a side wall portion inner surface molding surface (first side wall portion inner surface molding surface) 20b for molding one side wall portion 101 inner surface of the press molded product 100 and the other side wall portion 101 inner surface of the press molded product 100 is molded. An inner surface molding surface (second sidewall portion inner surface molding surface) 20b is formed. The first side wall portion inner surface molding surface 20b is configured by the left side surface of FIG. 1 in the lower mold 20, and the second side wall portion inner surface molding surface 20b is configured by the right side surface of FIG.

  The inner surface 20a of the top wall portion of the lower mold 20 extends substantially horizontally. The left and right side wall inner surface molding surfaces 20b, 20b extend in the vertical direction, and are gently inclined so that the distance between them increases toward the lower side. In addition, the side wall part inner surface molding surfaces 20b and 20b may extend substantially parallel to each other. The shapes of the top wall inner surface molding surface 20 a and the side wall inner surface molding surfaces 20 b and 20 b are not limited to the above shapes, and can be changed depending on the shape of the press-molded product 100. Further, flange forming surfaces 20 c and 20 c for forming the flange 103 of the press-formed product 100 are formed on the upper surface of the lower mold 20. Each flange forming surface 20c is connected to the lower end portion of the side wall portion inner surface forming surface 20b and extends substantially horizontally.

  The upper mold 30 is composed of three molds. That is, the upper die 30 includes a top wall portion outer surface forming die 31 on which a forming surface 31a for forming the outer surface of the top wall portion 102 of the press-formed product 100 is formed, and a side wall portion forming surface 33a for forming the outer surface of one side wall portion 101. And a second side wall portion outer surface mold 34 formed with a side wall portion molding surface 34a for molding the outer surface of the other side wall portion 101. The top wall portion outer surface forming die 31 is disposed immediately above the lower die 20. The first side wall portion outer surface molding die 33 and the second side wall portion outer surface molding die 34 are disposed so as to sandwich the top wall portion outer surface molding die 31 in the width direction (left-right direction in FIG. 1).

  The molding surface 31a of the top wall portion outer surface molding die 31 is formed so as to extend in a substantially horizontal direction at the lower end surface of the top wall portion outer surface molding die 31, and faces the top wall portion inner surface molding surface 20a of the lower die 20. ing. The width of the top wall portion outer surface molding die 31 is set substantially equal to the width of the top wall portion inner surface molding surface 20a from the upper part to the lower part. The top wall portion outer surface molding die 31 is attached to the lower surface of the movable platen 3 via an extension device 32. The expansion / contraction device 32 is configured to expand and contract in the vertical direction, and can be configured by, for example, a gas cylinder device or the like. The upper part of the telescopic device 32 is fixed to the lower surface of the movable platen 3, and the lower part is fixed to the upper part of the top wall part outer surface molding die 31. Therefore, when an upward force is applied to the top wall portion outer surface molding die 31a, the expansion device 32 can be contracted by the force and the top wall portion outer surface molding die 31 can be moved upward with respect to the movable platen 3. When the force is removed, the expansion / contraction device 32 extends, and the top wall portion outer surface forming die 31 can be moved downward with respect to the movable platen 3.

  The first side wall portion outer surface molding die 33 is disposed on the left side (left side in FIG. 1) of the top wall portion outer surface molding die 31. The side wall portion molding surface 33 a of the first side wall portion outer surface molding die 33 is formed to extend upward from the lower end portion of the right side surface of the first side wall portion outer surface molding die 33. The side wall portion molding surface 33a is slightly inclined so as to approach the top wall portion outer surface molding die 31 as it goes upward. A flange forming surface 33 b for forming the flange 103 of the press-formed product 100 is formed on the lower end surface of the first side wall portion outer surface forming die 33. The flange forming surface 33b is connected to the lower end portion of the side wall portion forming surface 33a and extends substantially horizontally. Therefore, at the lower part of the first side wall part outer surface molding die 33, a corner is formed at a portion where the side wall part molding surface 33a and the flange molding surface 33b intersect.

  A first guided surface 33 c is formed on the left side surface of the first side wall portion outer surface molding die 33. The first guided surface 33c extends upward from the lower end portion of the left side surface of the first side wall portion outer surface molding die 33, and inclines toward the left side, that is, away from the top wall portion outer surface molding die 31 as it goes upward. It consists of an inclined surface.

  The first side wall portion outer surface molding die 33 is attached to the lower surface of the movable platen 3 via the first slide device 35. The first slide device 35 is a support portion that supports the first side wall portion outer surface molding die 33 on the movable platen 3 so as to be movable in the left-right direction of FIG. 1, that is, in the horizontal direction, and may be constituted by a linear motion guide, for example. it can. Specifically, the first slide device 35 includes a fixed member 35 a that is fixed to the lower surface of the movable platen 3 and a movable member 35 b that is fixed to the upper surface of the first side wall portion outer surface molding die 33. The member 35b is engaged with the fixing member 35a. The fixed member 35a extends in the left-right direction, and the movable member 35b moves in the left-right direction along the fixed member 35a. In addition, the first slide device 35 constantly urges the movable member 35 b in the left direction, that is, in the direction away from the top wall portion outer surface molding die 31. As a result, when viewed in the left-right direction, the first side wall portion outer surface molding die 33 in the mold open state (see FIG. 3A) is on the left as compared with the mold closed state (see FIG. 3F). Will be located.

  Further, the second side wall portion outer surface molding die 34 is disposed on the right side (the right side in FIG. 1) of the top wall portion outer surface molding die 31. The side wall portion molding surface 34 a of the second side wall portion outer surface molding die 34 is formed to extend upward from the lower end portion of the left side surface of the second side wall portion outer surface molding die 34. The side wall portion molding surface 34a is slightly inclined so as to approach the top wall portion outer surface molding die 31 as it goes upward. A flange forming surface 34 b for forming the flange 103 of the press-formed product 100 is formed on the lower end surface of the second side wall portion outer surface forming die 34. The flange forming surface 34b is connected to the lower end portion of the side wall portion forming surface 34a and extends substantially horizontally. Accordingly, a corner is formed at the lower portion of the second side wall portion outer surface molding die 34 at a portion where the side wall portion molding surface 34a and the flange molding surface 34b intersect.

  A second guided surface 34 c is formed on the right side surface of the second side wall portion outer surface molding die 34. The second guided surface 34 c extends upward from the lower end portion of the right side surface of the second side wall portion outer surface molding die 34, and inclines toward the right side, that is, away from the top wall portion outer surface molding die 31 as it goes upward. It consists of an inclined surface.

  The second side wall portion outer surface molding die 34 is attached to the lower surface of the movable platen 3 via the second slide device 36. The second slide device 36 is configured in the same manner as the first slide device 35, and is a support portion that supports the second side wall portion outer surface molding die 34 on the movable platen 3 so as to be movable in the left-right direction in FIG. The two-slide device 36 includes a fixed member 36 a that is fixed to the lower surface of the movable platen 3, and a movable member 36 b that is fixed to the upper surface of the second side wall portion outer surface molding die 34. Further, the second slide device 36 constantly urges the movable member 36b in the right direction, that is, in the direction away from the top wall portion outer surface molding die 31. Thus, when viewed in the left-right direction, the second side wall portion outer surface molding die 34 in the mold open state (see FIG. 3A) is more to the right than in the mold closed state (see FIG. 3F). Will be located.

  With the top wall portion outer surface forming die 31, the first side wall portion outer surface forming die 33, and the second side wall portion outer surface forming die 34 attached to the movable platen 3, the forming surface 31a of the top wall portion outer surface forming die 31 is the first. The flange molding surface 33 b of the side wall portion outer surface molding die 33 and the flange molding surface 34 b of the second side wall portion outer surface molding die 34 are located below.

  A first cam member 21 and a second cam member 22 are fixed to the upper surface of the fixed platen 2. The first cam member 21 is disposed on the left side of the lower mold 20. The second cam member 22 is disposed on the right side of the lower mold 20.

  A first cam surface 21 a is formed on the right side surface of the first cam member 21. The 1st cam surface 21a is comprised by the inclined surface which inclined with a predetermined angle with respect to the perpendicular so that it might approach the lower mold | type 20 so that it went to the lower side. The first guided surface 33c of the first side wall portion outer surface molding die 33 lowered from the position shown in FIG. 1 comes into contact with the first cam surface 21a, and the first side wall portion outer surface molding die 33 is brought into contact with the mold closing operation. The first guided surface 33c is pushed in the direction approaching the lower mold 20 (right direction), thereby moving the first side wall portion outer surface molding mold 33 in the direction approaching the lower mold 20. In addition, the first side wall portion outer surface molding die 33 is moved in the direction away from the lower die 20 (leftward) with the mold opening operation. That is, the 1st cam surface 21a contacts the 1st side wall part outer surface shaping | molding die 33, and moves the 1st side wall part outer surface shaping | molding die 33 in a horizontal direction with a mold closing operation | movement and a mold opening operation | movement. And the 1st cam surface 21a cooperates with the 1st slide apparatus 35, and the side wall part inner surface molding surface 20b of the lower mold | type 20 is side-to-side with the mold | die closing operation | movement (first side wall part 33). The first side wall portion outer surface molding die 33 after molding is pressed from the plate material W to the inner surface of the side wall portion of the lower mold 20 while being moved to approach from the left side) and pressed against the plate material W in the mold closed state. It moves so that it may leave | separate to the side (left side) of the molding surface 20b. The first cam surface 21a and the first slide device 35 constitute a mold drive unit.

  A second cam surface 22 a is formed on the left side surface of the second cam member 22. The 2nd cam surface 22a is comprised by the inclined surface which inclined with a predetermined angle with respect to the perpendicular line so that it may approach the lower mold | type 20 so that it goes below. The second guided surface 34c of the second side wall portion outer surface molding die 34 lowered from the position shown in FIG. 1 contacts the second cam surface 22a, and the second side wall portion outer surface molding die 34 is brought into contact with the mold closing operation. The second guided surface 34c is pushed in the direction approaching the lower mold 20 (left direction), thereby moving the second side wall portion outer surface forming mold 34 in the direction approaching the lower mold 20. Further, the second side wall portion outer surface molding die 34 is moved in the direction away from the lower die 20 (rightward direction) with the mold opening operation. That is, the 2nd cam surface 22a contacts the 2nd side wall part outer surface shaping | molding die 34, and moves the 2nd side wall part outer surface shaping | molding die 34 to a horizontal direction with a mold closing operation | movement and a mold opening operation | movement. And the 2nd cam surface 22a cooperates with the 2nd slide apparatus 36, and the 2nd side wall part outer surface shaping | molding die 34 is side-to-side to the side wall part inner surface shaping | molding surface 20b of the lower mold | type 20 with a mold closing operation | movement ( The second side wall portion outer surface molding die 34 is moved from the plate material W to the inner surface of the side wall portion of the lower die 20 in accordance with the mold opening operation. It moves so that it may leave | separate to the side (right side) of the molding surface 20b. The second cam surface 22a and the second slide device 36 constitute a mold drive unit.

  Next, a description will be given of how to form a press-formed product 100 as shown in FIG. 2 using the hot press-forming device 1 configured as described above. First, as shown in FIG. 3A, the upper mold 30 is moved upward to bring the lower mold 20 and the upper mold 30 into the mold open state. In the mold open state, the telescopic device 32 is in an extended state, so that the top wall portion outer surface molding die 31 is in the lowered end position. Further, since the first side wall portion outer surface molding die 33 is urged by the first slide device 35, the first side wall portion outer surface molding die 33 is positioned on the left as compared with when the mold is closed, and the second side wall portion outer surface molding die 34 is Since it is urged by the two-slide device 36, it is in a state of being positioned to the right as compared to when it is in the mold closed state. And the flat board | plate material W heated with the heating apparatus (not shown) until it becomes quenching temperature is mounted in the top wall part inner surface molding surface 20a of the lower mold | type 20. As shown in FIG.

  Thereafter, as shown in FIG. 3B, the movable platen 3 is lowered by the driving device 4 to bring the upper die 30 closer to the lower die 20. At this time, the molding surface 31a of the top wall portion outer surface molding die 31 is positioned below the flange molding surface 33b of the first sidewall portion outer surface molding die 33 and the flange molding surface 34b of the second sidewall portion outer surface molding die 34. Therefore, the molding surface 31a of the top wall portion outer surface molding die 31 is formed on the plate material W before the flange molding surface 33b of the first sidewall portion outer surface molding die 33 and the flange molding surface 34b of the second sidewall portion outer surface molding die 34. In contact with the plate member W, the molding surface 31a of the top wall portion outer surface molding die 31 and the top wall portion inner surface molding surface 20a of the lower die 20 come into contact. That is, the timing when the molding surface 31a of the top wall portion outer surface molding die 31 and the top wall portion inner surface molding surface 20a of the lower die 20 come into contact with the plate material W is determined by the first side wall portion outer surface molding die 33 and the second side wall portion. The timing is set to be earlier than the timing at which the outer surface molding die 34 contacts the plate material W.

  Thereby, before the 1st side wall part outer surface shaping | molding die 33 and the 2nd side wall part outer surface shaping | molding die 34 contact the board | plate material W, the board | plate material W is the shaping | molding surface 31a of the top wall part outer surface shaping | molding die 31, and a lower mold | type. 20 is sandwiched in the thickness direction by the top wall portion inner surface molding surface 20a, so that the plate material W is fixed so as not to move.

  When the upper mold 30 is further lowered, the expansion / contraction device 32 contracts, and the state in which the molding surface 31a of the top wall portion outer surface molding die 31 is pressed against the plate material W is maintained. Thereafter, as shown in FIG. 3C, the first side wall portion outer surface molding die 33 and the second side wall portion outer surface molding die 34 come into contact with the plate material W to bend the plate material W downward. At this time, since the plate member W is fixed by the molding surface 31a of the top wall portion outer surface molding die 31 and the top wall portion inner surface molding surface 20a of the lower die 20, the first side wall portion outer surface molding die 33 and the second wall portion W are fixed. Molding by the side wall portion outer surface molding die 34 is accurately performed as intended.

  As shown in FIG. 3 (d), when the upper mold 30 is further lowered, the plate material W is pushed and bent, and the first side wall portion outer surface molding die 33 is formed on the first cam surface 21 a of the first cam member 21. The first guided surface 33 c comes into contact with the second cam surface 22 a of the second cam member 22, and the second guided surface 34 c of the second side wall portion outer surface molding die 34 comes into contact with it.

  As shown in FIG. 3 (e), when the upper mold 30 is further lowered, the first side wall portion outer surface molding die 33 is molded by the first cam surface 21 a of the first cam member 21 to form the side wall portion inner surface of the lower mold 20. While approaching the surface 20b from the side and being pressed against the plate material W, the second side wall portion outer surface forming die 34 is moved to the side surface portion inner surface forming surface 20b of the lower die 20 by the second cam surface 22a of the second cam member 22. It approaches from the direction and is pressed against the plate material W. Thereby, the side wall parts 101 and 101 and the flanges 103 and 103 are formed.

  Next, as shown in FIG. 3 (f), when the lower die 20 and the upper die 30 are closed, the top wall inner surface molding surface 20 a of the lower die 20 and the molding surface 31 a of the top wall outer surface molding die 31 are formed. The top wall portion 102 is molded, and one side wall portion 101 is molded by the side wall portion molding surface 33a of the first side wall portion outer surface molding die 33 and the side wall portion inner surface molding surface 20b of the lower die 20 to form the second side wall portion. The other side wall portion 101 is formed by the side wall portion molding surface 34 a of the outer surface molding die 34 and the side wall portion inner surface molding surface 20 b of the lower die 20. Further, the flanges 103 and 103 are formed by the flange forming surfaces 20c and 20c of the lower mold 20, the flange forming surface 33b of the first side wall portion outer surface forming die 33, and the flange forming surface 34b of the second side wall portion outer surface forming die 34. The

  In the mold closed state, the top wall portion inner surface molding surface 20a of the lower mold 20 and the molding surface 31a of the top wall portion outer surface molding die 31 sandwich the plate material W in the thickness direction. This portion is sufficiently cooled by the top wall inner surface molding surface 20a of the lower mold 20 and the molding surface 31a of the top wall outer surface molding die 31. Further, the side wall part molding surface 33a of the first side wall part outer surface molding die 33 and the side wall part inner surface molding surface 20b of the lower mold 20 sandwich the plate material W in the thickness direction, and the side wall of the second side wall part outer surface molding die 34 Since the portion molding surface 34a and the side wall portion inner surface molding surface 20b of the lower mold 20 sandwich the plate material W in the thickness direction, the portions that become the side wall portions 101 and 101 in the plate material W are sufficiently cooled.

  When the mold is opened after molding, the movable platen 3 is moved upward. Then, first, the first side wall portion outer surface molding die 33 and the second side wall portion outer surface molding die 34 move upward. The first side wall portion outer surface molding die 33 and the second side wall portion outer surface molding die 34 are guided by the first cam surface 21a and the second cam surface 22a, and are laterally separated from the side wall portion inner surface molding surfaces 20b, 20b of the lower die 20. To go. Therefore, when the mold is opened, the first side wall portion outer surface molding die 33 and the second side wall portion outer surface molding die 34 move away from the side wall portions 101, 101 of the press-molded product 100 after molding. Therefore, the press-formed product 100 does not bite into the lower mold 20 and the upper mold 30. Therefore, even if the clearance between the lower mold 20 and the upper mold 30 and the plate material W at the time of mold closing is minimized or almost eliminated, the press-molded product 100 can be easily removed, so that the lower mold 20 and the upper mold 30 can remove the plate material. Cooling of W is performed uniformly.

  As described above, according to the hot press molding apparatus 1 according to this embodiment, the first side wall portion outer surface molding die 33 and the second side wall portion outer surface for molding the side wall portions 101, 101 of the press-formed product 100. The mold 34 can be moved away from the side wall portions 101 and 101 of the press-formed product 100 to the side of the side wall portions 101 and 101 in accordance with the mold opening operation. Thereby, the clearance between the plate material W and the lower mold 20 and the upper mold 30 is reduced as a whole, and uneven cooling of the plate material W by the lower mold 20 and the upper mold 30 is suppressed, and the press-formed product 100 after the molding is performed. Can be prevented from biting into the lower mold 20 and the upper mold 30 and the demolding of the press-formed product 100 can be facilitated.

  Further, since the first cam member 21 and the second cam member 22 are provided, the first side wall portion outer surface molding die 33 and the second side wall portion outer surface molding die 34 can be moved using the moving force of the movable platen 3. In addition, the movement of the movable platen 3 and the movement of the first side wall portion outer surface molding die 33 and the second side wall portion outer surface molding die 34 can be reliably synchronized.

  In addition, the hot press molding apparatus 1 can be used in the case of molding a press-molded product having a hat-shaped cross section in addition to the automotive part.

  Moreover, you may make it the 1st side wall part outer surface shaping | molding die 33 and the 2nd side wall part outer surface shaping | molding die 34 approach the side wall part inner surface shaping | molding surfaces 20b and 20b of the lower mold | type 20 by rock | fluctuating, for example.

  Further, a press-formed product 100 having a shape as in Modification 1 shown in FIG. 4 can be formed by the hot press-forming apparatus 1. The top wall 102 of the press-formed product 100 of Modification 1 is formed with a recess 102a that opens upward. The recess 102 a extends in the longitudinal direction of the press-formed product 100. The cross section of the recess 102a can be rectangular, but is not limited thereto. In this case, although not shown, a concave portion is formed on the top wall inner surface molding surface 20a of the lower mold 20, and a convex portion is formed on the molding surface 31a of the upper die 30 so as to correspond to the concave portion of the top wall inner surface molding surface 20a. Form. Thereby, the said recessed part 102a can be shape | molded by the recessed part of the top wall part inner surface molding surface 20a and the convex part of the molding surface 31a of the upper mold | type 30 in the press molded product 100. FIG.

  Further, a press-formed product 100 having a shape as shown in Modification 2 shown in FIG. Two concave portions 102b and 102b that open upward are formed on the top wall portion 102 of the press-formed product 100 of the second modification. In this case, two concave portions are formed on the inner surface 20a of the top wall portion of the lower mold 20, and two convex portions are formed on the molding surface 31a of the upper die 30, thereby forming the concave portions 102b and 102b into the press-molded product 100. Can be molded. The number of the recesses 102b may be three or more.

  Further, a press-formed product 100 having a shape as shown in Modification 3 shown in FIG. The press-formed product 100 of Modification 3 does not have a flange. In this case, the shapes of the lower mold 20 and the upper mold 30 may be set so as not to mold the flange.

  Further, a press-formed product 100 having a shape as shown in Modification 4 shown in FIG. The press-formed product 100 of Modification 4 does not have a flange, and a recess 102 a as in Modification 1 is formed on the top wall 102.

  In addition, a press-formed product 100 having a shape as shown in Modification 5 shown in FIG. The press-formed product 100 of Modification 5 does not have a flange, and two concave portions 102 b and 102 b as in Modification 2 are formed on the top wall 102.

  Further, a press-formed product 100 having a shape as shown in Modification 6 shown in FIG. The press-formed product 100 of Modification 6 does not have a flange, has only one side wall portion 101, and has a cross section that is nearly L-shaped. In this case, the second side wall portion outer surface molding die 34 can be omitted, and the one side wall portion inner surface molding surface 20b can be omitted.

  Further, a press-formed product 100 having a shape as shown in Modification 7 shown in FIG. The press-formed product 100 according to the modified example 7 does not have a flange, has only one side wall portion 101, and the concave portion 102 a as in the modified example 1 is formed on the top wall portion 102.

  Further, a press-formed product 100 having a shape as shown in Modification 8 shown in FIG. The press-molded product 100 of the modified example 8 does not have a flange, has only one side wall portion 101, and two concave portions 102b and 102b as in the modified example 2 are formed on the top wall portion 102. .

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the hot press molding apparatus according to the present invention can be used, for example, when molding automobile pillars, side sills, door impact bars, and the like.

1 Hot press molding device 3 Movable platen 20 Lower mold (first mold)
20a Top wall inner surface molding surface 20b Side wall inner surface molding surface (first and second side wall inner surface molding surfaces)
21a 1st cam surface 21a, 35 type | mold drive part 22a 2nd cam surface 22a, 36 type | mold drive part 30 Upper type | mold (2nd shaping | molding die)
31 Top wall part outer surface molding die 31a Molding surface 33 First side wall part outer surface molding die 33a Side wall part molding surface 34 Second side wall part outer surface molding die 34a Side wall part molding surface 100 Press molded product 101 Side wall part 102 Top wall part 103 Flange W Board

Claims (6)

In a hot press molding apparatus for press-molding a heated metal plate material to obtain a press-molded product having a side wall portion and a top wall portion,
A first mold that is switched between a mold open state and a mold closed state in contact with and away from each other; and a second mold
The first mold is formed with a first side wall inner surface molding surface for molding the inner side wall surface of the press-molded product and a top wall inner surface molding surface for molding the top wall inner surface.
The second molding die is formed with a top wall portion outer surface molding die on which a molding surface for molding the outer surface of the top wall portion of the press molded product is formed, and a molding surface for molding the outer surface of the side wall portion of the press molded product. A first side wall portion outer surface mold,
While the mold is closed, the first side wall portion outer surface mold is moved so as to approach the first side wall portion inner surface molding surface of the first mold from the side and pressed against the plate material in the mold closed state. A hot press molding apparatus further comprising a mold drive unit that moves away from the plate material to the side of the first side wall portion inner surface molding surface of the first molding die in accordance with the mold opening operation. . In the hot press molding apparatus according to claim 1,
The first side wall portion inner surface molding surface of the first molding die is molded on one side wall portion inner surface of the press-molded product,
The first molding die is formed with a second side wall portion inner surface molding surface for molding the other side wall portion inner surface of the press-molded product,
In the first side wall portion outer surface molding die of the second molding die, a molding surface for molding one side wall portion outer surface of the press-molded product is formed,
The second mold has a second side wall outer surface mold on which a molding surface for molding the other side wall outer surface of the press-molded product is formed,
The mold drive unit moves the second side wall portion outer surface molding die so as to approach the second side wall portion inner surface molding surface of the first molding die from the side in accordance with the mold closing operation. A hot press molding apparatus, wherein the hot press molding apparatus is pressed against the plate material and is moved away from the plate material to the side of the second side wall portion inner surface molding surface of the first molding die in accordance with a mold opening operation. In the hot press molding apparatus according to claim 1 or 2,
The hot press molding apparatus includes a movable plate to which the second mold is attached, and the moving direction of the movable plate is a vertical direction,
The mold drive unit is configured to support the first side wall portion outer surface molding die so as to be movable in a horizontal direction with respect to the movable platen, and to contact the first side wall portion outer surface molding die to perform a mold closing operation and a mold. A hot press molding apparatus comprising: a cam surface that moves the first side wall portion outer surface molding die in a horizontal direction in accordance with the opening operation. In the hot press molding apparatus according to claim 3,
The hot press molding apparatus according to claim 1, wherein the cam surface is an inclined surface inclined at a predetermined angle with respect to a vertical line. In the hot press molding apparatus according to any one of claims 1 to 4,
The timing at which the top wall portion inner surface molding surface of the first molding die and the top wall portion outer surface molding die of the second molding die contact the plate material is such that the first side wall portion outer surface molding die contacts the plate material. A hot press forming apparatus characterized by being set to be earlier than the timing. In the hot press molding apparatus according to claim 2,
The hot press molding apparatus, wherein the first side wall part outer surface mold and the second side wall part outer surface mold are arranged so as to sandwich the top wall part outer surface mold.

Images