JP7115444B2 - Press equipment for hat-shaped cross-section parts - Google Patents

Description

TECHNICAL FIELD The present invention relates to a press device for a part with a hat-shaped cross section (hereinafter also referred to as a "hat-shaped cross-section part").

When manufacturing a hat-shaped cross-sectional part used for a vehicle frame member, etc., a metal plate-shaped work is shaped into a hat-shaped cross section using a press machine equipped with dies such as dies, pads, punches, and holders. It is often pressed (drawn).

More specifically, a die having a downward opening, a pad provided on the die so as to be able to move upward relative to the die so as to be pushed into the opening against the downward biasing force, A press device is prepared that includes a punch arranged to face the die and a holder that vertically faces the die and is provided around the punch so as to be movable downward against an upward biasing force. Then, the workpiece is placed on the holder and punch, and the die and pad are lowered toward it to clamp the mold. Then, the pad and the punch vertically sandwiching the top plate portion of the work, and the die and the holder vertically sandwiching the flange portion on both sides of the top plate portion in the width direction relatively move up and down, pushing the pad upward. A vertical wall is formed between the top plate and the flange by inserting the punch into the opening of the die.

However, such a press device has the following problems. That is, when the die is moved upward when the die is released (when the die is opened), the punch is removed from the die opening, and the pad moves relatively downward in the die opening due to the biasing force. Around it, the holder moves upward due to the biasing force. Then, as the punch moves away from the lower surface of the top plate, the pressure of the pad acts from above on the top plate that has lost its support from below by the punch, and the pressure of the holder acts on the flange from below. will work. For this reason, the hat-shaped cross-sectional component is compressed vertically by the pressure applied by the pad and the holder, and there is a risk that the hat-shaped cross-sectional component will be deformed in such a manner that the vertical wall will buckle.

Therefore, for example, in Patent Document 1, by penetrating the blank holder and attaching it to the punch during mold release, a holder side restriction portion that fixes the blank holder to the punch, and a die that penetrates and is attached to the pad Thus, there is disclosed a manufacturing apparatus for a hat-shaped cross-sectional part that limits the pressing force of the holder and the pad by providing a pad-side limiting portion that fixes the pad to the die.

WO2015/046023

However, in Patent Document 1, a restricting portion for restricting the pressure force by restricting the relative movement of the holder with respect to the punch and the relative movement of the pad with respect to the die is provided inside the press device, so large-scale processing or the like is required. , there is a problem that the mold structure is complicated and the manufacturing cost is increased.

Therefore, in order to suppress the complication of the mold structure, a horizontally movable block is provided on the holder. It is conceivable that the positional relationship between the pad and the holder in the clamped state can be maintained even during the mold opening by inserting the block into the mold. According to this method, the positional relationship between the pad and the holder in the clamped state is maintained even when the mold is opened, with a simple structure in which the block is provided on the holder without processing the inside of the mold. It is possible to suppress the deformation of the hat-shaped cross-section part at the time of mold release.

By the way, in order to maintain the positional relationship between the pad and the holder in the clamped state, the design interval between the pad and the holder at the insertion position (the position facing the pad in the holder vertically) and the height dimension of the block must be adjusted to some extent. Should be set equal (slightly smaller).

However, if the design interval between the pad and the holder at the insertion position is approximately equal to the height of the block, the block and pad tend to move on the holder toward the insertion position when the mold is flexed. interfere with each other, it becomes difficult to insert the block between the pad and the holder, and furthermore, it becomes difficult to suppress the deformation of the hat-shaped cross-sectional part at the time of demolding.

The present invention has been made in view of the above points, and its object is to provide a hat-shaped cross-sectional part press device that, even when the mold is flexed, has a simple configuration, and the hat-shaped cross-sectional part can be removed from the mold. To provide a technique for suppressing deformation of cross-sectional parts.

In order to achieve the above object, in the pressing apparatus for a hat-shaped cross-section part according to the present invention, the shape of the pad and/or the shape of the block at the insertion position are devised so that the block is placed between the pad and the holder. Makes it easy to insert.

Specifically, the present invention includes a pad and a punch for sandwiching in the first direction a portion of a workpiece to be a top plate that will become a top plate after molding, and a die that sandwiches a portion of the workpiece to become a flange after molding in the first direction. and a holder are relatively displaced in a first direction to form a vertical wall between the top plate and the flange.

This press apparatus includes the die having an opening that opens in one side in the first direction, and the die in the other side in the first direction so as to be pushed into the opening against the biasing force toward the one side in the first direction. the pad provided on the die so as to be relatively movable to the side; the punch arranged to face the pad in the first direction; the punch facing the die in the first direction; The holder provided around the punch so as to be movable in one direction in a first direction against the biasing force, and the block provided on the holder so as to be movable in a second direction orthogonal to the first direction. , wherein the block is moved in the second direction from a position in the holder not facing the pad in the first direction, and is inserted between the end of the pad in the second direction and the holder. The positional relationship between the pad and the holder in the clamped state is maintained even during mold opening, and the surface on the one side in the first direction at the end of the pad in the second direction and the block At least one of the surfaces on the other side in the first direction is formed of an inclined surface that inclines toward the one side in the first direction toward the insertion side in the second direction.

According to this configuration, the pad and the punch sandwiching the pre-top portion in the first direction and the die and the holder sandwiching the pre-flange portion in the first direction move relative to each other in the first direction, and the pad moves in the first direction. By inserting the punch into the opening of the die while pushing it to the side, it is possible to form a hat-shaped cross-section component having a vertical wall formed between the top plate and the flange.

In addition, at least one of the surface on the one side in the first direction at the end portion in the second direction of the pad and the surface on the other side in the first direction of the block inclines toward the one side in the first direction toward the insertion side in the second direction. In other words, since the blocks are wedge-shaped in the insertion direction with respect to the ends of the pads in the second direction, even if the mold is flexed, the pad and the holder will not be separated. Blocks can be smoothly inserted between them.

In this way, with a simple configuration in which the block is inserted between the end of the pad in the second direction and the holder, the positional relationship between the pad and the holder in the clamped state is maintained even during the mold opening. Deformation of the hat-shaped cross-section part during molding can be suppressed.

INDUSTRIAL APPLICABILITY As described above, according to the pressing apparatus for a hat-shaped cross-section component according to the present invention, even when the mold is flexed, the deformation of the hat-shaped cross-section component at the time of mold release is suppressed with a simple configuration. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows typically the principal part of the press apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows a hat-shaped cross-section component typically. It is a cross-sectional view which illustrates typically the manufacturing procedure 1 of a hat-shaped cross-section component. It is a cross-sectional view which illustrates typically the manufacturing procedure 2 of a hat-shaped cross-section component. It is a cross-sectional view which illustrates typically the manufacturing procedure 3 of a hat-shaped cross-section component. It is a cross-sectional view which illustrates typically the manufacturing procedure 4 of a hat-shaped cross-section component. It is a cross-sectional view which illustrates typically the manufacturing procedure 5 of a hat-shaped cross-section component. It is a figure which illustrates typically the relationship between a pad edge part and a locking block. It is a figure which illustrates typically the state which the hat-shaped cross-section component bent by the pressing force of a pad. FIG. 5 is a diagram schematically illustrating the relationship between the end of the pad and the locking block when the mold is flexed; FIG. 6 is a vertical cross-sectional view schematically showing a main part of a pressing device according to Embodiment 2 of the present invention; It is a figure which illustrates typically the relationship between a pad edge part and a locking block. FIG. 5 is a diagram schematically illustrating the relationship between the end of the pad and the locking block when the mold is flexed; FIG. 2 is a cross-sectional view schematically illustrating a press device of conventional art 1; FIG. 10 is a vertical cross-sectional view schematically illustrating a conventional press device 2; FIG. 10 is a vertical cross-sectional view schematically illustrating a conventional press device 2; It is a figure which illustrates typically the problem of the press apparatus of the conventional 2. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing. 1 is referred to as the longitudinal direction, and the lateral direction in FIGS. 3 to 7 is referred to as the width direction (perpendicular to the longitudinal direction). In order to make the drawing easier to see, only the die piece 13, pad 20, punch 30, holder 40, work 70 and hat-shaped cross-sectional part 80 in the cross-sectional view are hatched.

(Embodiment 1)
-Overall configuration of the press-
FIG. 1 is a vertical cross-sectional view schematically showing a main part of a press device 1 according to this embodiment. 3 to 7 are cross-sectional views schematically explaining manufacturing procedures 1 to 5 according to this embodiment. As shown in FIGS. 1 and 3 to 7, the press apparatus 1 includes a die 10, a pad 20, a punch 30, and a holder 40 as dies, and a locking mechanism 50 is mounted on the holder 40. It has As shown in FIG. 3, the press machine 1 performs press working (drawing) on a metal plate-like workpiece 70 placed on a punch 30 and a holder 40, thereby forming a metal plate as shown in FIG. A part having a hat-shaped cross section (hereinafter also referred to as a "hat-shaped cross-section part") 80 is manufactured.

<Hat-shaped cross section>
As shown in FIG. 2, the hat-shaped cross-sectional component 80 includes a top plate 81 curved in a substantially inverted V shape along the longitudinal direction, and a pair of vertical walls 83 hanging down from both ends of the top plate 81 in the width direction. , and a pair of flanges 85 each extending widthwise outward from the lower ends of the pair of vertical walls 83 and curved in a substantially inverted V shape along the longitudinal direction, and have a hat-shaped cross section that opens downward. formed. The hat-shaped cross-sectional component 80 is formed by joining a hat-shaped cross-sectional component (not shown), which opens upward opposite to the hat-shaped cross-sectional component 80, and a pair of flanges 85 by spot welding or the like. It is used as a frame member for a vehicle such as a front side member.

<die>
The die 10 has a generally rectangular parallelepiped shape as a whole and is fixed to a slide of a press (not shown). As shown in FIGS. 1 and 3 to 7, the die 10 is formed with an opening 17 opening downward (one side in the first direction). In other words, the die 10 is formed in a substantially box shape that opens downward. The die 10 includes a die body 11, a die piece 13, and a plurality of nitrogen gas cylinders 15, as shown in FIGS.

The die piece 13 is attached to the lower end of the die main body 11 , and the inner side surface of the die piece 13 forms part of the wall surface of the opening 17 (lower end). As shown in FIG. 3, the lower end surface 13a of the die piece 13 protrudes downward from the lower end surface of the die body 11 and is curved in a substantially inverted V shape along the longitudinal direction. In this case, it constitutes the first forming surface 13a that presses the pre-flange portions 75 (both sides in the width direction of the work 70) that will become the flanges 85 after the work 70 is formed. As shown in FIGS. 1 and 3 to 7, a plurality of nitrogen gas cylinders 15 are attached to the upper surface of the opening 17, and the rods 15a are always projected downward by the pressure of the nitrogen gas.

<pad>
The pad 20 is formed in a substantially rectangular parallelepiped shape and is provided in the opening 17 of the die 10 as shown in FIGS. attached to the As a result, the pad 20 is always urged downward by the nitrogen gas cylinder 15, but when a force pushing the pad 20 upward acts, the downward urging force of the nitrogen gas cylinder 15 is resisted. relative to the die 10 (on the other side in the first direction) so as to be pushed into the opening 17 by pressing.

Among the lower surfaces of the pad 20, a central lower surface that constitutes a second forming surface 20a that presses a portion 71 to be the top plate 81 after molding of the work 70 (the center portion in the width direction of the work 70) during press working. 20a is curved in a substantially inverted V shape along the longitudinal direction, as shown in FIG. On the other hand, of the lower surface of the pad 20, the lower surface 21a of both longitudinal ends of the pad 20 (hereinafter also referred to as “pad end portions 21”) located on both longitudinal direction outer sides of the central lower surface 20a is described later. In addition, it is formed so as to be inclined downward toward the inner side in the longitudinal direction. When the pad 20 is pushed downward by the nitrogen gas cylinder 15 and is in the lowest state (the rod 15a is fully extended), as shown in FIG. are arranged in the opening 17 so as to be aligned.

<punch>
The punch 30 is mounted on a lower die 31 fixed to the bolster of the press, as shown in FIGS. 1 and 3-7. The lower mold 31 is formed in a substantially box-like shape that opens upward, and has a punch holder 33 extending upward at the center thereof. The punch 30 is attached to the upper end portion of the punch holder 33 so that the upper surface 30a thereof faces the second forming surface 20a of the pad 20 vertically (in the first direction). The upper surface 30a of the punch 30 is curved in a substantially inverted V shape along the longitudinal direction in the same manner as the second forming surface 20a of the pad 20, and presses the intended top plate portion 71 of the work 70 during press working. It constitutes the third molding surface 30a.

<holder>
The holder 40 has a pair of first portions 41 positioned on both sides in the longitudinal direction of the punch 30 and a pair of second portions 43 positioned on both sides in the width direction of the punch 30, and is formed in a substantially rectangular annular shape. It is The upper surface 41a of the first portion 41 is formed substantially horizontally, while the upper surface 40a of the second portion 43 is curved in a substantially inverted V shape along the longitudinal direction so that the flange of the workpiece 70 is bent during press working. It constitutes a fourth molding surface 40 a that presses the planned portion 75 .

When the holder 40 thus formed is arranged on the lower mold 31 so that the punch 30 is inserted into the ring, the holder 40 is positioned around the punch 30 . A plurality of nitrogen gas cylinders 35 are provided around the punch holder 33 in the lower die 31, as shown in FIGS. It has become. The lower end of holder 40 is attached to the upper end of rod 35 a of nitrogen gas cylinder 35 . As a result, the holder 40 is always urged upward by the nitrogen gas cylinder 35 , but when a downward force is applied to the holder 40 , the holder 40 is pushed downward against the urging force of the nitrogen gas cylinder 35 . configured to be movable. The holder 40 is urged upward by the nitrogen gas cylinder 35 so that the fourth molding surface 40a is flush with the third molding surface 30a in the highest state (the rod 35a is fully extended). , are arranged on the lower mold 31 .

When the lower die 31 having the holder 40 arranged around the punch 30 is fixed to the bolster of the press and the die 10 is fixed to the slide of the press, the pad 20 and the punch 30 are vertically opposed to each other. At the same time, the die 10 and the holder 40 face each other vertically. More specifically, the second molding surface 20a of the pad 20 and the third molding surface 30a of the punch 30 vertically face each other, and the first molding surface 13a of the die piece 13 and the fourth molding surface 40a of the holder 40 vertically face each other. will face each other.

<Locking mechanism>
The locking mechanism 50 is provided on the upper surface 41a of the first portion 41 of the holder 40, as shown in FIG. FIG. 1 shows a state in which the locking block 51 is positioned at a position (facing position 57 ) vertically facing the pad end portion 21 in the holder 40 . In FIG. 1, a gap is provided between the lower surface 21a of the pad end portion 21 and the upper surface of the locking block 51 for the sake of clarity, but the two are actually in contact with each other.

The locking mechanism 50 has a locking block 51 and an air cylinder 53 . The air cylinder 53 is configured such that the rod 55 is advanced and retracted by compressed air supplied through a pipe (not shown). The air cylinder 53 is arranged on the upper surface 41a of the first portion 41 of the holder 40 in such a posture that the rod 55 advances inward in the longitudinal direction. The locking block 51 is attached to the tip of the rod 55 and is moved back and forth in the longitudinal direction (second direction) orthogonal to the vertical direction by the air cylinder 53 .

When the locking block 51 is positioned at the non-facing position 59 on the upper surface 41a of the first portion 41 by retracting the rod 55, the locking block 51 does not overlap the pad end 21 in plan view. When positioned at the facing position 57 on the upper surface 41 a of the first portion 41 , it is positioned directly below the pad end portion 21 . Therefore, in relation to the claims, the non-facing position 59 corresponds to "a position in the holder that does not face the pad in the first direction".

The forward/backward movement of the locking block 51 in the locking mechanism 50, in other words, the driving of the air cylinder 53, is controlled by a control device (not shown), operator's operation, or the like. Specifically, the locking block 51 is moved from the non-facing position 59 to the facing position 57 after mold clamping and before mold opening (at the bottom dead center of molding) each time the hat-shaped cross-section component 80 is molded. , is moved from the opposed position 57 to the non-opposed position 59 after mold opening and before mold closing (at the top dead center of molding).

-Manufacturing procedure for hat-shaped cross-section parts-
When manufacturing the hat-shaped cross-sectional component 80 using the press apparatus 1 configured as described above, first, the workpiece 70 is placed on the punch 30 and the holder 40 as shown in FIG. More specifically, as shown in FIG. 3 , the pre-top portion 71 of the work 70 is placed on the third forming surface 30 a of the punch 30 , and the pre-flange portion 75 of the work 70 is placed on the fourth forming surface 40 a of the holder 40 . be placed on. In this state, no downward pressing force acts on the holder 40, and the rod 35a is fully extended, so that the third molding surface 30a and the fourth molding surface 40a are flush with each other.

Next, when the slide of the press machine is driven to lower the die 10, as shown in FIG. In addition, the pre-flange portion 75 is sandwiched between the first forming surface 13 a of the die piece 13 and the fourth forming surface 40 a of the holder 40 on both outer sides in the width direction of the pre-top plate portion 71 .

From this state, the die 10 is further lowered to vertically move the pad 20 and the punch 30 vertically sandwiching the pre-top portion 71 and the die 10 and the holder 40 vertically sandwiching the pre-flange portion 75 . Specifically, when the die 10 is further lowered, the holder 40 pushed downward by the die piece 13 moves downward against the urging force of the nitrogen gas cylinder 35 as shown in FIG. The pad 20 pushed relatively upward by the pressure is moved upward relative to the die 10 so that the pad 20 is pushed into the opening 17 against the biasing force of the nitrogen gas cylinder 15 . As a result, the punch 30 enters the opening 17 of the die 10 while pushing the pad 20 relatively upward, whereby the top plate 81 is formed from the planned top plate portion 71, and the flange 85 is formed from the planned flange portion 75. At the same time, a vertical wall 83 is formed from a portion 73 between both 71 and 75 to form the hat-shaped cross-sectional component 80 .

After the hat-shaped cross-section component 80 is molded in this manner, the mold is opened. Prior to this, in order to facilitate understanding of the present invention, a press apparatus for a hat-shaped cross-section component according to Conventional 1 will be described.

FIG. 14 is a cross-sectional view for schematically explaining the press device 101 of Conventional 1. As shown in FIG. In the conventional press machine 101 as well, as shown in FIG. 14, a pad 120 and a punch 130 for vertically sandwiching the predetermined portion of the workpiece for the top plate, and a die 110 and a holder 140 for vertically sandwiching the predetermined portion for the flange of the workpiece. It is the same as the pressing device 1 of the present embodiment in that the hat-shaped cross-sectional component 180 is formed by relatively moving .

However, the conventional press device 101 has the following problems. That is, when the die 110 is moved upward during release (during opening of the mold), the punch 130 is removed from the opening 117 of the die 110, and the pad 120 moves downward within the opening 117 of the die 110 due to the biasing force. On the other hand, around the punch 130, the holder 140 relatively moves upward due to the biasing force. Then, as the punch 130 moves away from the lower surface of the top plate 181 , the pressing force of the pad 120 acts from above on the top plate 181 that has lost the support from below by the punch 130 , and the flange 185 is pressed against the top plate 181 . On the other hand, the pressing force of the holder 140 due to the urging force acts from below. Therefore, the hat-shaped cross-sectional component 180 is vertically compressed by the pressure applied by the pad 120 and the holder 140, and as shown in FIG. 14, the vertical wall 183 is buckled. may be deformed.

Therefore, in the pressing apparatus 1 according to the present embodiment, by inserting the locking block 51 between the pad 20 and the holder 40, the nitrogen gas cylinders 15, 35, which are supposed to act on the hat-shaped cross-sectional part 80 at the time of mold release, are removed. The locking block 51 receives the pressing force of the pad 20 and the holder 40 due to the urging force of , so as not to act on the hat-shaped cross-section member 80 .

Specifically, the locking block 51 is moved longitudinally inward from a position 59 not facing the pad 20 in the holder 40 to a position 57 facing the pad 20 , and the locking block is moved between the pad end 21 and the holder 40 . The pressing device 1 is configured such that the vertical positional relationship between the holder 40 and the pad 20 in the clamped state is maintained even during mold opening by inserting the holder 51 .

More specifically, the locking block 51 is moved from the non-opposed position 59 to the opposed position 57 after the mold is closed after the press machine has completely slid down and before the mold is opened for demolding and taking out the hat-shaped cross-sectional component 80 . 1, the locking block 51 is inserted between the lower surface 21a of the pad end 21 and the upper surface 41a of the first portion 41 of the holder 40. Then, as shown in FIG.

Here, if the air cylinder 53 for moving the locking block 51 is provided outside the holder 40, the positional adjustment of the air cylinder 53 and the locking block 51 in the vertical direction becomes complicated. By providing not only the locking block 51 but also the air cylinder 53 on the holder 40, the locking block 51 can be easily moved horizontally on the holder 40 without requiring vertical positioning of the air cylinder 53 and the locking block 51. It is possible to move.

Next, when the die 10 is lifted by driving the slide of the press, the punch 30 is separated from the lower surface of the top plate 81 and the holder 40 is lifted by the biasing force of the nitrogen gas cylinder 35, as shown in FIG. However, since the locking block 51 receives both the pressurizing force of the pad 20 due to the biasing force of the nitrogen gas cylinder 15 and the pressurizing force of the holder 40 due to the biasing force of the nitrogen gas cylinder 35 , the pad does not move against the top plate 81 and the flange 85 . The pressurizing force of 20 and holder 40 does not act. By inserting the locking block 51 between the pad 20 and the holder 40 in this way, the positional relationship in the vertical direction between the pad 20 and the holder 40 in the clamped state (bottom dead center of molding) can be maintained even during mold opening. Since this is maintained, it is possible to prevent the hat-shaped cross-sectional component 80 from being vertically compressed by the pressure applied by the pad 20 and the holder 40 .

Then, when the holder 40 is in the highest position, that is, when the third molding surface 30a and the fourth molding surface 40a are flush with each other, the lower surface 21a of the pad end portion 21 begins to separate from the locking block 51. At the same time, since the second molding surface 20a of the pad 20 is separated from the upper surface of the top plate 81, the pressing force of the pad 20 due to the biasing force does not act on the top plate 81 from above.

Therefore, as shown in FIG. 7, demolding can be performed without causing deformation of the hat-shaped cross-sectional component 80 . When the mold removal of the hat-shaped cross-section component 80 is completed in this way, the mold is moved from the opposing position 57 to the non-opposing position 59 in preparation for molding the next hat-shaped cross-section component 80, that is, after mold opening and before mold clamping. The locking block 51 is moved to return to the same state as in FIG.

-Relationship between pad edge and locking block-
As described above, in this embodiment, by inserting the locking block 51 between the pad end portion 21 and the holder 40, it is possible to suppress the deformation of the hat-shaped cross-sectional component 80 at the time of mold release. Depending on the relationship between the end portion 21 and the locking block 51, the following problems may occur.

15 and 16 are vertical cross-sectional views for schematically explaining the press device 201 of Conventional 2. FIG. Note that the press device 201 has substantially the same configuration as the press device 1 of the present embodiment except for the shapes of the pad end portion 221 and the locking block 251 . Therefore, in the conventional press device 201 shown in FIGS. 15 and 16, the same reference numerals as those used in the press device 1 are used for the same components as in the press device 1 .

In the pressing device 201, as shown in FIGS. 15 and 16, the lower surface 221a of the pad end portion 221 is formed as a horizontal surface, and correspondingly, the upper surface 251a of the locking block 251 is formed as a horizontal surface. . In addition, the height dimension of the locking block 251 is too smaller than the design interval (hereinafter also referred to as "required interval I") between the lower surface 221a of the pad end portion 221 and the upper surface 41a of the first portion 41 at the opposing position 57. As a result, it becomes difficult to maintain the positional relationship between the holder 40 and the pad 20 in the clamped state.

Then, when the mold is removed by the pressing device 201, after the hat-shaped cross-section component 80 is molded at the bottom dead center of molding, as shown in FIG. 251 is moved from the non-facing position 59 to the facing position 57 to insert the locking block 251 between the pad end 221 and the holder 40 (first portion 41) as shown in FIG. In this manner, by inserting the locking block 251 having a height dimension substantially equal to the required interval I between the lower surface 221a of the pad end portion 221 and the upper surface 41a of the first portion 41, the pad 20 in the clamped state can be adjusted. and the holder 40, the pressing force of the pad 20 (see the white arrow in FIG. 16) and the pressing force of the holder 40 (see the black arrow in FIG. 16) are received by the locking block 251, and the mold release It is possible to suppress deformation of the hat-shaped cross-section component 80 at times.

However, if the height dimension of the locking block 251 is set substantially equal to the required interval I in order to maintain the positional relationship between the pad 20 and the holder 40 in the clamped state, when the mold is bent as shown in FIG. When the holder 40 is flexed D, the vertical distance between the lower surface 221a of the pad end 221 and the upper surface 41a of the holder 40 at the facing position 57 is less than the required distance I by the flexure D. As a result, the locking block 251 and the pad end portion 221 that are about to move on the holder 40 (first portion 41 ) toward the facing position 57 interfere with each other. There is a problem that it becomes difficult to insert the locking block 251 into the

Therefore, in the present embodiment, the locking block 51 can be easily inserted between the pad end portion 21 and the holder 40 by devising the shape of the pad end portion 21 and the shape of the locking block 51 . Specifically, in the press apparatus 1 of the present embodiment, as shown in FIG. 8, both the lower surface 21a of the pad end portion 21 and the upper surface 51a of the locking block 51 are downwardly moved toward the inner side (insertion side) in the longitudinal direction. It consists of an inclined tapered surface (inclined surface). In FIG. 8, a gap is provided between the bottom surface 21a of the pad end portion 21 and the top surface 51a of the locking block 51 for the sake of clarity, but actually both 21a and 51a are in contact with each other. .

Here, the steeper the inclination of the lower surface 21a of the pad end 21 and the upper surface 51a of the locking block 51, in other words, the taper amount Ta (the lower surface 21a of the pad end 21 (or the upper surface 51a of the locking block 51) ) is increased, it becomes easier to insert the locking block 51 between the pad end portion 21 and the first portion 41 . However, if the taper amount Ta is made too large, slippage may occur between the lower surface 21a of the pad end portion 21 and the upper surface 51a of the locking block 51, and if the pad end portion 21 is lowered by the taper amount Ta, a hat-shaped pad may be formed. There is a risk that the cross-section component 80 will be deformed. Therefore, in this embodiment, the taper amount Ta is limited.

FIG. 9 is a diagram schematically illustrating a state in which the hat-shaped cross-sectional component 80 is bent by the pressing force A (see the black arrow) of the pad 20. As shown in FIG. As shown in FIG. 9, the pressing force A of the pad 20 acts from above on the top plate 81 of the hat-shaped cross-sectional component 80 whose vertical wall 83 has a height of H, and the hat-shaped cross-sectional component 80 moves downward by Δh. is flexed to Here, assuming that the Young's modulus of the hat-shaped cross-sectional component 80 is E, the buckling stress Y generated in the hat-shaped cross-sectional component 80 is represented by the following (Equation 1).

Y=E×Δh/H (Formula 1)
Therefore, assuming that the allowable buckling stress of the hat-shaped cross-section component 80 is Ya, the allowable deflection amount Δha is expressed by the following (Equation 2).

Δha=Ya×H/E (Formula 2)
Therefore, if the taper amount Ta<the allowable deflection amount Δha, even if a slip should occur between the lower surface 21a of the pad end portion 21 and the upper surface 51a of the locking block 51, the vertical wall 83 would theoretically buckle. The hat-shaped cross-sectional component 80 is not deformed in such a manner. Therefore, in the present embodiment, the taper amount Ta is limited to less than the allowable deflection amount Δha of the hat-shaped cross-sectional component 80 .

FIG. 10 is a diagram schematically illustrating the relationship between the pad end portion 21 and the locking block 51 when the mold is bent. In the pressing device 1 of the present embodiment, as described above, both the lower surface 21a of the pad end portion 21 and the upper surface 51a of the locking block 51 are formed of tapered surfaces that slope downward toward the inner side in the longitudinal direction. As shown in FIG. 10, even when the mold (holder 40) is bent, the pad can be removed without interference between the locking block 51 and the pad end 21, which are about to move on the holder 40 toward the facing position 57. As shown in FIG. The locking block 51 can be smoothly inserted between the end portion 21 and the first portion 41 . As a result, the positional relationship in the vertical direction between the pad 20 and the holder 40 in the clamped state is maintained even during mold opening, so that deformation of the hat-shaped cross-section component 80 can be suppressed when the mold is released.

Moreover, by limiting the taper amount Ta to less than the allowable deflection amount Δha of the hat-shaped cross-sectional component 80, even if slippage occurs between the lower surface 21a of the pad end 21 and the upper surface 51a of the locking block 51, Since the amount of deflection generated by this can be suppressed to less than the allowable amount of deflection Δha, it is possible to suppress deformation of the hat-shaped cross-sectional member 80 in such a manner that the vertical wall 83 buckles.

(Embodiment 2)
This embodiment differs from the first embodiment in that a gap G is set between the lower surface 22a of the pad end portion 22 and the upper surface 52a of the locking block 52. As shown in FIG. Hereinafter, the points different from the first embodiment will be mainly described.

FIG. 11 is a vertical cross-sectional view schematically showing the main part of the pressing device 1' according to this embodiment, and FIG. be. The press device 1' has substantially the same configuration as the press device 1 of the first embodiment except for the pad 20' and the locking mechanism 50'. Moreover, the pad 20' has substantially the same configuration as the pad 20 of Embodiment 1 except for the shape of the pad end portion 22, and the locking mechanism 50' has the same structure as the locking mechanism of Embodiment 1 except for the shape of the locking block 52. It has almost the same configuration as the mechanism 50 . Therefore, in the press device 1' shown in FIG. 11, the same reference numerals as those used in the press device 1 are used for the same components as those of the press device 1 of the first embodiment.

11 and 12, both the lower surface 22a of the pad end portion 22 and the upper surface 52a of the locking block 52 are horizontal surfaces. As shown, a gap G is provided between the lower surface 22a of the pad end 22 and the upper surface 52a of the locking block 52 at the opposing location 57. As shown in FIG. Specifically, the height dimension of the locking block 52 is defined as the design interval between the lower surface 22a of the pad end portion 22 and the upper surface 41a of the first portion 41 at the facing position 57 (hereinafter also referred to as "required interval I'"). Only the gap G is set smaller than that.

Here, the larger the gap G, the easier it is to insert the locking block 52 between the pad end portion 22 and the first portion 41 . However, when the mold is opened, the pad 20' may be lowered by the gap G, and if the gap G is made too large, the hat-shaped cross-sectional part 80 may be deformed. Therefore, in this embodiment, the gap G is limited to less than the allowable amount of deflection Δha of the hat-shaped cross-section component 80 .

FIG. 13 is a diagram schematically illustrating the relationship between the pad end portion 22 and the locking block 52 when the mold is bent. In the pressing apparatus 1' of the present embodiment, as described above, the height dimension of the locking block 52 is set smaller than the required interval I' by the gap G. Therefore, as shown in FIG. 40) is bent, the pad end 22 does not interfere with the locking block 52 trying to move on the holder 40 toward the opposing position 57, and the pad end 22 and the first portion 41 The locking block 52 can be smoothly inserted into the . As a result, the positional relationship in the vertical direction between the pad 20' and the holder 40 in the clamped state can be easily maintained even during mold opening, so that deformation of the hat-shaped cross-sectional component 80 during mold release can be suppressed. Moreover, by limiting the gap G to less than the allowable deflection amount Δha of the hat-shaped cross-section component 80, the possible deflection amount can be suppressed to less than the allowable deflection amount Δha. Deformation of the hat-shaped cross-section component 80 can be suppressed.

(Other embodiments)
This invention is not limited to embodiments and can be embodied in various other forms without departing from its spirit or essential characteristics.

In the first embodiment, both the lower surface 21a of the pad end portion 21 and the upper surface 51a of the locking block 51 are tapered surfaces that slope downward toward the inner side in the longitudinal direction. The upper surface 51a of the locking block 51 may be formed as a horizontal surface, while only the lower surface 21a of the pad end portion 21 may be formed as a tapered surface that slopes downward toward the inner side in the longitudinal direction. While the lower surface 21a of the portion 21 is configured as a horizontal surface, only the upper surface 51a of the locking block 51 may be configured as a tapered surface that slopes downward toward the inner side in the longitudinal direction.

Further, in each of the above-described embodiments, the pressing direction (first direction) is the vertical direction, but the pressing direction is not limited to this, and any direction may be set.

Furthermore, in each of the above embodiments, the nitrogen gas cylinders 15 and 35 are used to apply the biasing force to the pad 20 and the holder 40, but the present invention is not limited to this. An elastic body may be used to apply a biasing force to the pad 20 and the holder 40 .

Thus, the above-described embodiments are merely examples in all respects and should not be construed in a restrictive manner. Furthermore, all modifications and changes within the equivalent range of claims are within the scope of the present invention.

INDUSTRIAL APPLICABILITY According to the present invention, even when the mold is flexed, deformation of the hat-shaped cross-section component can be suppressed with a simple structure when the mold is released. extremely beneficial.

1 Press device 10 Die 17 Opening 20 Pad 21 Pad end 21a Lower surface 30 Punch 40 Holder 51 Locking block 51a Upper surface 70 Work 71 Planned top plate portion 75 Planned flange portion 80 Hat-shaped cross-sectional part 81 Top plate 83 Vertical wall 85 Flange

Claims (1)

A pad and a punch that sandwich a portion of a work to be a top plate after molding in the first direction, and a die and a holder that sandwich a portion of the work to be a flange after molding in the first direction. A pressing device for a hat-shaped cross-sectional part that forms a vertical wall between the top plate and the flange by relatively moving,
the die having an opening that opens to one side in the first direction;
the pad provided on the die so as to be relatively movable in the other side in the first direction so as to be pushed into the opening against the biasing force in the one side in the first direction;
the punch arranged opposite to the pad in the first direction;
the holder provided around the punch so as to face the die in the first direction and to be movable in one side in the first direction against an urging force toward the other side in the first direction;
a block provided on the holder movably in a second direction orthogonal to the first direction,
The block is moved in the second direction from a position in the holder that does not face the pad in the first direction, and is inserted between the end of the pad in the second direction and the holder, thereby clamping the mold. is configured to maintain the positional relationship between the pad and the holder in the state even during mold opening,
At least one of a surface on the one side in the first direction at the end portion of the pad in the second direction and a surface on the other side in the first direction of the block inclines toward the one side in the first direction toward the insertion side in the second direction. A pressing device for a hat-shaped cross-section part, characterized by comprising an inclined surface.

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