JP2011056524A - Plate bending press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate bending press capable of manufacturing a half-finished pipe product having an adequate seam gap even in a case of a plate material having a large proof stress. <P>SOLUTION: The plate bending press is used to form the half-finished pipe product having the seam gap G by molding the plate material. The plate bending press includes: a pair of upper and lower dice M; a hydraulic cylinder 10 for moving the upper die MA toward the lower die MB; and a plate P for coupling the hydraulic cylinder 10 with the upper die MA. An interval holding means for restricting the movement of the plate material to a direction orthogonal to the moving direction of the upper die MA and maintaining a distance between the ends of the plate material to be more than the thickness of the plate P while the plate material is pressurized by the pair of upper and lower dice M is arranged at the side surface of the plate P. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plate bending press. More specifically, the present invention relates to a plate bending press used for forming a pipe by bending a plate material.

FIG. 7 is a schematic explanatory view of a plate bending press for forming a pipe from a plate material. As shown in FIG. 7, the plate bending press includes an upper mold MA, lower molds MB1 and MB2, and a slide S provided so as to be vertically movable by an urging means 10 such as a hydraulic cylinder. The upper mold MA is mounted on the slide S via a plate-shaped upper mold mounting plate P (hereinafter simply referred to as plate P) (for example, Patent Document 1).
In addition, the plate P is arrange | positioned so that the surface may follow the direction orthogonal to the paper surface in FIG.

  The operation | work which shape | molds a large diameter pipe from a board | plate material with this board bending press is performed in the following procedures.

First, a material (plate material) to be molded is disposed between the lower mold MB and the upper mold MA.
When the plate material is arranged, the slide S is moved downward by the urging means 10 and the plate material is urged by the upper mold MA. Then, at the position where each lower mold MB is provided, each of the lower molds MB1 and MB2 and the upper mold MA are in contact with the plate material. That is, since force is applied to the plate material from three points, the plate material is bent to a predetermined curvature.

When the plate material is bent to a predetermined curvature, the slide S rises, and the plate material is moved in the width direction (left and right direction in FIG. 7) by a fixed feed device (not shown) installed before and after the plate bending press (left and right in FIG. 7). ) Is moved along. When a place different from the previously formed place in the plate material is arranged between the lower mold MB and the upper mold MA, the slide S is moved downward, and the plate material is bent as described above.
If the bending process and the change of the bending process position are repeated as described above, an approximately pipe-shaped pipe semi-product having a gap (seam gap G) between the end parts is formed.

  The pipe semi-finished product formed by the above-described method becomes a complete pipe-like product by welding the seam gap G. Such welding is performed by a dedicated welding machine. Specifically, in the welding machine, the diameter of the seam gap G of the semi-finished pipe product is reduced to an interval suitable for welding, and the ends of the plate materials are welded in that state.

By the way, in the above-mentioned welding machine, if the seam gap G of the pipe semi-finished product is too wide, the pipe semi-finished product cannot be received. Therefore, the pipe semi-finished product is formed so that the seam gap G is within a predetermined range. There must be.
However, as shown in FIG. 8, the plate material pressed by the upper mold MA (the plate material being formed) is deformed so that the end portions thereof approach each other and the seam gap G becomes small (FIG. 8 ( A)) When the pressure applied by the upper mold MA is removed, the plate material is deformed so that the end portions are separated (spring back) by the elastic force and the seam gap G is increased (FIG. 8B). ).
For this reason, when finishing the plate material into a semi-finished pipe product in the final bending step, the pressing force (rolling force) of the upper mold MA is adjusted so that the seam gap G when the springback occurs is within a predetermined range. There is a need.

Here, if only the spring back is to be prevented, the applied pressure of the upper mold MA in the final bending process may be increased. However, if the applied pressure of the upper mold MA is increased, the plate material being molded accordingly. The seam gap G becomes smaller (see FIG. 8A). When the seam gap G during molding becomes small, both end portions of the plate material may hit the plate P. When both end portions of the plate material hit the plate P, the following problems occur.
1) The plate P is damaged.
2) The groove processing for welding processed at both ends of the plate material is damaged.
3) Both ends of the plate material are contaminated by oil and metal powder adhering to the plate P.

  Therefore, the pressurizing force of the upper mold MA in the final bending process can be set such that (1) the seam gap G when the springback occurs is within a predetermined range, and (2) the seam gap during molding. It is necessary to adjust to a range satisfying the two conditions that both ends of the plate do not hit the plate P even if G becomes smaller.

Conventionally, the plate material strength of the plate material that has been subjected to bending has a proof stress of about 50 to 60 kgf / mm ² , the amount of spring back is small, and it is not necessary to increase the pressing force during molding. Therefore, in order to satisfy the above two conditions for the pressing force of the upper mold MA, the spring back does not have to be a serious problem, and it is sufficient if the pressing force is adjusted so that the plate material being molded and the plate P do not interfere with each other. Met.

Recently, there has been a strong demand for pipe molding of a plate material having a proof stress exceeding 80 kgf / mm ² , but when such a plate material is molded so that the plate material and the plate P do not interfere with each other, the amount of springback becomes very large, The seam gap G of the semi-finished pipe product cannot fall within a predetermined range.
However, in order to reduce the amount of spring back, when molding is performed by applying a strong pressing force in the final bending process, the seam gap G during molding becomes small and both end portions of the plate material come into strong contact with the plate P.
In other words, with the current plate bending press, it is difficult to mold the plate material by adjusting the pressing force of the upper mold MA so as to satisfy the above two conditions for a plate material having a proof stress exceeding 80 kgf / mm ^2. There is a need for a plate bending press that can produce a semi-finished pipe product having an appropriate seam gap G without causing interference with the plate P during molding.

Japanese Patent No. 3810096

  In view of the above circumstances, an object of the present invention is to provide a plate bending press capable of manufacturing a semi-finished pipe product having an appropriate seam gap even if it is a plate material having a high yield strength.

A plate bending press according to a first aspect of the present invention is a plate bending press used for forming a pipe semi-finished product having a seam gap by forming a plate material, wherein a pair of upper and lower dies and an upper die are used as a lower die. And a plate for connecting the moving unit and the upper mold, and a side surface of the plate is arranged in a direction perpendicular to the moving direction of the upper mold. An interval holding means is provided for restricting the movement of the plate material and maintaining the distance between the end portions of the plate material to be equal to or greater than the thickness of the plate in a state where the plate material is pressed by the pair of upper and lower molds. It is characterized by that.
The plate bending press according to a second aspect of the present invention is the plate bending press according to the first aspect, wherein the interval holding means includes a pair of interval holding members erected on both side surfaces of the plate. In the state pressurized by a pair of upper and lower molds, it is provided so as to be positioned in a space formed by the plate material.
The plate bending press according to a third aspect of the present invention is the plate bending press according to the second aspect, wherein each spacing member has a distance from the tip to the lower end of the lower die in the moving direction of the upper die, They are arranged so that they have the same length, and are arranged so that the distance from the center of the plate to the tip thereof is the same as the inner radius of the semi-finished pipe product in the direction perpendicular to the moving direction of the upper mold. It is provided.
The plate bending press according to a fourth invention is the plate bending press according to the second or third invention, wherein the interval holding means includes a moving mechanism for moving the pair of interval holding members along the moving direction of the upper mold, The pair of spacing members include a distance adjusting mechanism that adjusts the distance from the center to the tip of the plate.
The plate bending press according to a fifth aspect of the present invention is the plate bending press according to the second, third or fourth aspect, wherein a rotating body having a rotation axis parallel to the moving direction of the upper mold is provided at the tip of the pair of spacing members. The rotating body is arranged so that a rotating surface thereof is in contact with an inner surface of the plate member when the plate member is pressed by the pair of upper and lower molds.

According to the first aspect of the present invention, it is possible to prevent the end portion of the plate material from coming into contact with the side surface of the plate even if the plate material is pressurized. Can be molded. In addition, since the plate and the plate material do not interfere with each other, damage to the plate and the plate material can be prevented.
According to the second invention, the pair of spacing members are provided in the space formed by the plate material, and the plate material can only move to a position where it contacts the pair of spacing members. Contact with the side surface can be prevented.
According to the third invention, when the plate material is pressurized, the inner surface of the plate material in the pressurized state can be maintained in a curved surface equivalent to the inner surface shape of the pipe semi-finished product, so that the molding accuracy of the pipe semi-finished product can be improved. .
According to the fourth aspect of the invention, since the position and size suitable for the semi-finished pipe product for molding the spacing member can be obtained, the semi-finished pipe products having different diameters can be accurately molded with one plate.
According to the fifth aspect, when the pipe semi-finished product is unloaded, the resistance between the spacing member and the pipe semi-finished product can be reduced. Therefore, even if a spacing member is provided, the semi-finished pipe product can be moved smoothly, so that it is possible to prevent the conveyance efficiency from being lowered, and it is also possible to prevent damage to the semi-finished pipe product due to interference with the spacing member. be able to.

It is a schematic front view of the plate bending press of this embodiment in the state which has shape | molded the board | plate material finally. It is a schematic front view of the plate bending press of this embodiment in the final shaping | molding completion state of a board | plate material. It is a simple substance side view of the board bending press of this embodiment. 3 is a schematic front view of a plate bending press provided with a moving mechanism 30. FIG. 3 is a schematic side view of a single unit of a plate bending press provided with a moving mechanism 30. FIG. It is a schematic front view of the plate bending press which has the space | interval holding member which provided the rotary body in the front-end | tip. It is a schematic explanatory drawing of the plate bending press which shape | molds a pipe from a board | plate material. It is a schematic explanatory drawing of the state which finally molds a pipe semi-finished product from a board material, (A) is a pressurization state, and (B) is the state after pressurization.

Next, an embodiment of the present invention will be described with reference to the drawings.
The plate bending press according to the present invention is a plate bending press for forming a semi-finished pipe product from a plate material, and even if the plate material is pressed in the final bending process, the interference between the plate material and the upper mold mounting plate for mounting the upper mold is provided. This is characterized by the fact that no occurrence occurs.

(Outline of plate bending press)
First, the outline of the plate bending press of this embodiment is demonstrated.
In FIG. 3, symbols B and C indicate the bed and crown of the plate bending press of this embodiment, respectively. Reference numeral T denotes a tie rod that connects the bed B and the crown C.

  As shown in FIG. 1, a plurality of lower molds MB are provided on the upper surface of the bed B via a wedge mechanism W. In the plate bending press for forming a semi-finished pipe product provided side by side along the width direction of the plate bending press (left and right in FIG. 3), each lower mold MB has two lower molds on the front and rear sides. It is composed of MB1 and MB2, and a gap is formed between the two, and the gap is arranged along the width direction of the plate bending press.

The wedge mechanism W is provided to move each lower mold MB in the vertical direction and adjust the position of the upper surface thereof, but the lower mold MB is moved in the vertical direction to adjust the position of the upper surface. The mechanism for adjustment is not particularly limited, and any mechanism can be employed.
Further, when it is not necessary to adjust the upper surface position of the lower mold MB, the lower mold MB may be attached to the upper surface of the bed B without providing the wedge mechanism W or the like.

As shown in FIG. 1, an upper mold MA is disposed above the plurality of lower molds MB, more specifically, above the gaps between the lower molds MB1 and MB2 in the plurality of lower molds MB. ing. The upper mold MA is one mold extending along the width direction of the plate bending press (left and right direction in FIG. 3). The upper mold MA is attached to the slide S via an upper mold mounting plate (hereinafter simply referred to as plate P). The plate P is thinner than the seam gap G in the pipe semi-finished product to be molded.
In addition, although the pair of space | interval holding member 20 is provided in the plate P in the plate bending press of this embodiment, the detail is mentioned later.

  As shown in FIGS. 1 and 2, a hydraulic cylinder 10 (corresponding to a moving means in the claims) is provided between the slide S and the crown C to move the slide S along the vertical direction. ing.

For this reason, if the slide S is moved downward by the hydraulic cylinder 10 with the material (plate material) to be molded arranged between the lower mold MB and the upper mold MA, each lower mold MB1, MB2 and upper mold MA are in contact with the plate material. That is, since force is applied to the plate material from three points, the plate material is bent to a predetermined curvature.
After the plate material is bent to a predetermined curvature, the slide S is raised by the hydraulic cylinder 10, and the width of the plate material is changed by a sizing feeder (not shown) installed before and after the plate bending press (left and right in FIG. 1). It moves along the direction (left-right direction in FIG. 1). Then, since a place different from the previously formed place in the plate material is arranged between the lower mold MB and the upper mold MA, if the slide S is moved downward by the hydraulic cylinder 10, it is the same as above. The plate is bent.
If the bending process and the change of the bending position are repeated as described above, a substantially pipe-shaped pipe semi-finished product having a gap (seam gap G) between the end portions can be formed.

(Description of the spacing member 20)
As shown in FIG. 1 and FIG. 2, a spacing member 20 is provided on the plate P in the plate bending press of the present embodiment.
The pair of spacing members 20, 20 are attached to the plate P via attachment plates Pa provided on the side surfaces of the plate P. The pair of spacing members 20, 20 are provided on the side surface of the plate P so as to be symmetric with respect to the center plane CS of the plate P.
In addition, as shown in FIG. 3, a pair of space | interval holding members 20 and 20 are provided in multiple places at intervals along the width direction (left-right direction in FIG. 3) of the two space | interval holding members 20 plate bending press. ing.

  Each spacing member 20 includes a shaft member 21 erected on the mounting plate Pa and a tip member 22 provided at the tip of the shaft member 21.

  The base end of the shaft member 21 is fixed to the surface of the mounting plate Pa so that the central axis CL is orthogonal to the side surface of the plate P. Note that the shaft members 21 of the pair of spacing members 20 and 20 are disposed such that the center axes CL of the pair are spaced on the same axis.

  Further, the tip member 22 is a known shoe or the like, and is a member having a low frictional resistance when contacting the plate material. The tip member 22 is formed such that the tip surface is a curved surface. For example, the front end surface of the front end member 22 has an arcuate line of intersection with a plane parallel to the moving direction of the upper mold MA (vertical direction in FIG. 1) and including the central axis CL of the shaft member 21. Is formed so that the radius of curvature is substantially the same as the radius of curvature of the inner surface of the semi-finished pipe product.

The spacing member 20 has a distance L1 from the center plane CS of the plate P to the tip (tip of the tip member 22) in the normal direction of the plate P (direction perpendicular to the moving direction of the upper mold MA). The pipe is formed to have the same length as the radius of the semi-finished product.
In addition, the distance holding member 20 has a distance L2 from the lower end of the upper mold MA to the tip thereof (that is, the central axis CL of the shaft member 21) in the moving direction of the upper mold MA is the same as the radius of the pipe semi-finished product. It is arrange | positioned so that it may become length.

As described above, if the pair of spacing members 20 and 20 are provided, in the process of bending the plate material, the pair of spacing members 20 and 20 are accommodated in the space h formed by the plate material (see FIG. 1 and FIG. 1). Figure 2).
Then, when the upper mold MA is pressed in the final bending process, the plate material is held in a pair evenly even if the plate material is deformed so that the portion located on the side of the plate P moves toward the plate P. It can be made to contact the members 20 and 20 (FIG. 1). That is, the movement of the plate material can be limited by the pair of spacing members 20 and 20.

  Moreover, since the distance L1 from the center plane CS of the plate P to the tip of the spacing member 20 (tip of the tip member 22) is the same length as the radius of the semi-finished pipe product, the upper die MA is used in the final bending step. Even if the pressure is strongly applied, the seam gap G during pressurization (see FIG. 1) does not become narrower than the proper seam gap G (see FIG. 2) of the pipe semi-finished product.

Therefore, regardless of the proof stress of the plate material, the plate material can be molded with a pressing force that can prevent the interference between the plate P and the plate material while keeping the springback amount within a predetermined range, so the proof stress exceeds 80 kgf / mm ² . Even if it is such a board | plate material, the pipe semi-finished product which has the appropriate seam gap G can be shape | molded, and damage to the plate P and a board | plate material can also be prevented.

Further, not only the distance L1 from the center plane CS of the plate P to the tip of the spacing member 20 (tip of the tip member 22) but also the distance L2 from the lower end of the upper mold MA to the center axis CL of the shaft member 21 is a pipe. It is the same length as the radius of the semi-finished product.
Then, it can prevent that a board | plate material curves more than a pipe semi-finished product. Specifically, it is possible to prevent the curvature radius of the inner surface of the plate material from being smaller than the curvature radius of the inner surface of the pipe semi-finished product.
Therefore, since the inner surface of the plate material can be maintained in a curved surface equivalent to the inner surface of the pipe semi-finished product as well as the final bending step, the molding accuracy of the molded pipe semi-finished product can be improved.

Note that the distance L2 from the lower end of the upper mold MA to the central axis CL of the shaft member 21 does not necessarily have to be the same length as the radius of the semi-finished pipe product, and the distance L1 is equal to the radius of the semi-finished pipe product. For example, the movement of the plate material inward (direction toward the plate P) can be restricted so that the interference between the plate P and the plate material does not occur.
Further, even when the distance L1 is shorter than the radius of the pipe semi-finished product, the movement of the plate material inward is limited so that the interference between the plate P and the plate material does not occur if the distance L2 is adjusted. Can do. For example, when the distance L1 is the height at which the shaft member 21 is provided, after the final molding from the center plane CS of the plate P in the normal direction of the side surface of the plate P (direction parallel to the center axis CL of the shaft member 21). If the distance is longer than the distance to the inner surface of the pipe semi-finished product, the inward movement of the plate material can be restricted so that the interference between the plate P and the plate material does not occur. In particular, when the distance L2 is longer than the radius of the pipe semi-finished product, the contact position between the tip member 22 and the pipe semi-finished product is close to the seam gap G, so that the effect is enhanced.

  Further, the pair of spacing members 20, 20 uses a member having a small frictional resistance when contacting the plate member as the tip member 22. Then, even if a board | plate material and a pair of space | interval holding member 20 and 20 contact, it can prevent that a board | plate material is damaged by the contact with the front-end | tip member 22. FIG.

After the final bending step, the molded pipe semi-finished product (see FIG. 2) is perpendicular to the direction of movement of the upper mold MA and both directions of the central axis CL of the shaft member 21 (in FIG. 2, perpendicular to the paper surface). In this case, even if the pipe semi-finished product and the spacing member 20 come into contact with each other, it is possible to prevent the plate material from being damaged.
And since the front-end | tip member 22 can also be functioned as a guide at the time of carrying out, the state which carried out the board | plate material stably can be performed.

The tip member may be provided with a rotating body 22 as shown in FIG. In this case, the resistance between the spacing member 20 and the semi-finished pipe product when the molded semi-finished product is carried out can be further reduced, so that the pipe half due to interference with the spacing member 20 can be reduced. Product damage can also be prevented. And since a pipe semi-finished product can be moved smoothly, it can also prevent that the conveyance efficiency at the time of carrying out a pipe semi-finished product falls.
For example, a rotating body 22a is attached to the tip of the shaft member 21 via a bracket 22c or the like so that the rotating shaft 22b is parallel to the moving direction of the upper mold MA. Then, when the final molding is performed, the rotating surface comes into contact with the inner surface of the plate material, and thus the above-described effects can be obtained.

In order to maintain the strength of the shaft member 21, it is preferable to provide a reinforcing plate 21c between the shaft member 21 and the mounting plate Pa.
In addition, a plate-like member may be employed instead of the shaft member 21, and there is no particular limitation as long as the tip member 22 can be held at a predetermined position even when pressure from the plate material is applied. And if the front-end | tips, such as the shaft member 21, are formed so that it may have a function equivalent to the above-mentioned front-end | tip member 22, the front-end | tip member 22 does not need to be provided.

(Description of moving mechanism 30)
Further, the spacing member 20 may be attached to the plate P via the moving mechanism 30 so that the distance L2 from the lower end of the upper mold MA to the central axis CL of the shaft member 21 may be adjusted by the moving mechanism 30.
In this case, the height (distance L2) of the spacing member 20 is adjusted by changing the contact position between the spacing member 20 and the semi-finished pipe product, and the distance L1 at that height is the center of the plate P at that height. It arrange | positions in the position which becomes longer than the distance from the surface CS to the inner surface of the pipe semi-finished product after final shaping | molding. Then, even if the radius of the semi-finished pipe product is changed, it is possible to restrict the inward movement of the plate material so that the interference between the plate P and the plate material does not occur.
Specifically, even if the radius of the pipe semi-product to be formed is larger than the distance L1, the inward movement of the plate material can be restricted so that the interference between the plate P and the plate material does not occur.

  In particular, when the moving mechanism 30 as described above is provided, it is more preferable to provide a mechanism that can also adjust the position of the tip of the spacing member 20, that is, the distance L1 from the center plane CS of the plate P to the tip of the spacing member 20. preferable. When the mechanism for adjusting the distance L1 is provided, the distance L1 and the distance L2 can be adjusted to be the same length as the radius of the pipe half product to be molded when the radius of the pipe half product to be molded is changed. Then, since it can shape | mold in the state which maintained the inner surface of the board | plate material in the curved surface equivalent to the inner surface in a pipe semi-finished product, the advantage that the shaping | molding precision of a pipe semi-finished product can be improved is acquired.

  For example, the following configuration can be adopted for the moving mechanism 30 as described above.

In FIG. 4 and FIG. 5, symbol Ph indicates a mounting hole provided in the plate P. A moving member 31 of the moving mechanism 30 is disposed in the mounting hole Ph.
The moving member 31 has a side surface provided parallel to the side surface of the plate P, and is arranged so that it can move along the moving direction of the upper mold MA while maintaining the side surface parallel to the side surface of the plate P. It is installed. Specifically, both end surfaces (left and right end surfaces in FIG. 5) of the moving member 31 are guided by guides 31a provided on the inner surface of the mounting hole Ph so that they can move along the moving direction of the upper mold MA. Is provided.

  As shown in FIG. 4, the moving member 31 is provided with a screw hole penetrating up and down, and a screw shaft 32 provided parallel to the moving direction of the upper mold MA is screwed into the screw hole. Match. The screw shaft 32 is attached to the plate P so that its lower end is rotatable but cannot be moved in the vertical direction.

  The plate P is provided with a servo motor 33. The servo motor 33 is disposed such that its main shaft is parallel to the moving direction of the upper mold MA, and the upper end of the screw shaft 32 is connected to the main shaft.

If the moving mechanism 30 is configured as described above, the moving member 31 can be moved along the moving direction of the upper mold MA when the servo motor 33 is operated. If the shaft member 21 is erected, the spacing member 20 can be moved along with the moving member 31 along the moving direction of the upper mold MA.
When the operation of the servo motor 33 is stopped, the interval holding member 20 can be held at the height at which the moving member 31 is stopped. That is, the spacing member 20 can be moved so that the distance L2 has a desired length.

Further, as a mechanism for adjusting the distance L1 from the center plane CS of the plate P to the tip of the spacing member 20, for example, a mechanism as shown in FIG. 4 can be employed.
In FIG. 4, reference numeral 35 indicates a screw shaft provided on the moving member 31. The screw shaft 35 is disposed so that the central axis thereof is orthogonal to the side surface of the moving member 31, and is attached so that it can rotate with respect to the moving member 31 but cannot move in the axial direction. Yes.
A screw hole formed at the base end of the shaft member 21 of the spacing member 20 is screwed into the screw formed at the tip of the screw shaft 35. The shaft member 21 of the spacing member 20 is held by holding means (not shown) so that it can move in the axial direction of the screw shaft 35 when the screw shaft 35 rotates, but does not rotate with the screw shaft 35.

  With this configuration, if the screw shaft 35 is rotated by a rotating means such as a motor (not shown), the shaft member 21 of the spacing member 20 can be moved back and forth along the axial direction of the screw shaft 35. The distance L1 from the center plane CS to the tip of the spacing member 20 can be adjusted.

  In particular, as the screw shaft 35, if a screw shaft having a right screw (or left screw) formed at one end and a left screw (or right screw) formed at the other end is used and the lead of each screw is the same, When the shaft 35 is rotated, the shaft member 21 of each spacing member 20 can be advanced and retracted in the opposite direction by the same amount. Then, the advantage that the distance L1 from the center plane CS of the plate P to the tip of each spacing member 20 can be adjusted simultaneously is obtained.

The mechanism for moving the moving member 31 is not limited to the above mechanism, and any mechanism can be used as long as the moving member 31 can be moved along the moving direction of the upper mold MA and can be stopped at a desired position. Various mechanisms can be employed. For example, a cylinder mechanism such as a hydraulic cylinder can be employed.
Further, the distance adjusting mechanism is not limited to the above-described mechanism, and various mechanisms can be adopted.

  The plate bending press of the present invention is suitable for a press for forming a large-diameter pipe from a plate material and a press for forming a member having a partial cylindrical portion.

10 Hydraulic cylinder 20 Spacing member 30 Moving mechanism B Bed C Crown P Plate S Slide MA Upper mold MB Lower mold

Claims (5)

A plate bending press used to mold a plate material to form a semi-finished pipe product having a seam gap,
A pair of upper and lower molds, moving means for moving the upper mold toward the lower mold, and a plate for connecting the moving means and the upper mold,
On the side surface of the plate, the movement of the plate material in a direction orthogonal to the moving direction of the upper mold is restricted, and in the state where the plate material is pressed by the pair of upper and lower molds, A plate bending press, characterized in that an interval holding means is provided for maintaining the distance between the portions to be equal to or greater than the thickness of the plate. The interval holding means is
A pair of spacing members provided upright on both sides of the plate;
Each spacing member is
2. The plate bending press according to claim 1, wherein the plate material is provided so as to be positioned in a space formed by the plate material in a state where the plate material is pressed by the pair of upper and lower molds. Each spacing member is
In the moving direction of the upper mold, the distance from the tip to the lower end of the lower mold is arranged to be the same length as the inner radius of the pipe semi-finished product,
The distance from the center of the plate to the tip thereof in the direction orthogonal to the moving direction of the upper mold is arranged to be the same length as the inner radius of the pipe semi-finished product. 2. The plate bending press according to 2. The interval holding means is
A moving mechanism for moving the pair of spacing members along the moving direction of the upper mold;
The pair of spacing members are
4. The plate bending press according to claim 2, further comprising a distance adjusting mechanism for adjusting a distance from the center of the plate to the tip. A rotating body having a rotation axis parallel to the moving direction of the upper mold is provided at the tips of the pair of spacing members,
The rotating body is
The plate according to claim 2, 3 or 4, wherein the plate is disposed such that a rotating surface thereof is in contact with an inner surface of the plate in a state where the plate is pressed by the pair of upper and lower molds. Bending press.

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