JP2023124428A - Bending method - Google Patents

Abstract

To provide a bending method which can easily perform calibration according to a processing position of a table to suppress cost increase of a bending product.SOLUTION: A bending method uses a press-brake with a first butting part (25L) and a second butting part (25R) respectively having a first butting surface and a second butting surface in which a back-gage device (2) is included to capable of moving the first and second butting parts (25L, 25R) in an orthogonal direction of a bending line (BL) and performing approximating movement and separation movement along the bending line (BL). When a bending material (5) includes a basic part and a butting piece part to be a bending product, bending processing is repeated a specified number of times while shifting a position of a material bending line per processing in which the first and second butting parts (25L, 25R) are positioned so that the material bending line of the bending material (5) is aligned with the bending line (BL) where the butting piece part is butted to the first butting surface and the basic part is butted to the second butting surface (25Ra).SELECTED DRAWING: Figure 8

Description

The present invention relates to a bending method.

Patent Literature 1 describes a bending method for forming a curved surface such as a conical surface by bending a sheet metal material using a press brake.
The press brake used in the bending method described in Patent Literature 1 is provided with an abutting device (hereinafter referred to as a back gauge) that operates to assist the bending of the curved surface.
This back gauge consists of a pair of guide members each having an abutment surface positioned on the same abutment line in a plan view, and a straight guide beam that supports the pair of guide members and extends left and right and is horizontally arranged. have

The pair of guide members are movable so as to move away from each other on the guide beam. The guide beam can be inclined at any angle with respect to the bending position (line) extending to the left and right of the press brake in plan view.
As a result, the angle between the abutment line and the bending line of the pair of guide members in plan view can be set to an arbitrary angle.

On the other hand, the bending material is formed in a shape having a basic portion which is to be a bent product and an auxiliary abutting piece extending outward from the outline of the basic portion. The outer edge shape of the auxiliary abutment piece is formed so as to be in line contact with the abutment surfaces of both of the pair of guide members of the press brake in plan view.

When processing a predetermined range of the bending material into a curved surface such as a conical surface using the back gauge and bending material described above, a pair of guide members are placed in advance so that the edges of the auxiliary abutting pieces are placed on their abutting surfaces. It is set so that the bending line of the bending material and the bending position of the press brake are aligned when they are struck so as to be in line contact in plan view.
Specifically, the inclination angle of the guide beam with respect to the bending line and the lateral positions of the pair of guide members on the guide beam are set at predetermined angles and positions.
As a result, the bending material can be bent along a desired bending line simply by abutting the bending material against the abutment surface. Hereinafter, the bending line in the bending material will be referred to as the material bending line to distinguish it from the bending line on the press brake side.

By gradually changing the inclination angle of the guide beam and the horizontal position of the pair of guide members in the guide beam set as described above, bending is performed multiple times in the curved surface forming range of the bending material, thereby forming a conical surface, etc. can form a curved surface of
Then, in the final stage of bending, the auxiliary abutting piece is cut off to obtain a bent product having a desired curved surface shape.

Japanese Patent No. 5743322

In the conventional bending method using a back gauge and a bending material described in Patent Document 1, the bending position on the table is shifted in the left-right direction according to the distance in the front-rear direction between the material bending line and the abutment edge of the auxiliary abutment piece. It is necessary to adjust and decide. If the bending position on the table is not in the center but is shifted to the left or right, it is necessary to correct, for example, the amount of run-in in order to eliminate the imbalance of the processing load on the left and right of the press brake. However, this correction depends a lot on the experience of the operator and is not necessarily easy.
In addition, if the curved surface to be formed is not a conical surface, it becomes necessary to form a plurality of straight edges with different angles on the edge of the auxiliary abutment piece, and the auxiliary abutment piece is cut off without contributing to the shape of the product. becomes larger. As a result, the utilization efficiency of the bent material is lowered and the cost of the bent product is increased.
Therefore, there is a demand for a bending method that facilitates correction according to the machining position of the table and that suppresses an increase in the cost of the bent product.

In order to solve the above problems, one aspect of the present invention has the following configuration.
1) It has a first abutting portion and a second abutting portion each having a first abutting surface and a second abutting surface as abutting surfaces, and the first abutting portion and the second abutting portion Using a press brake equipped with a back gauge device that can move the 2 abutting parts independently in a direction perpendicular to the bending line of the bending process and can move away from and in contact with each other along the bending line,
A curved surface is formed by bending to form a bent product having the curved surface. ,
The first abutment portion and the second abutment portion are in a state in which the abutment piece abuts against the first abutment surface and the base portion abuts against the second abutment surface. and performing the bending process by positioning the material bending line of the bending process applied to the bending material so as to coincide with the bending line, and performing the bending process a predetermined number of times while shifting the position of the material bending line for each bending process. A bending method for forming a curved surface.
2) having a first abutting portion and a second abutting portion each having a first abutting surface and a second abutting surface as abutting surfaces; Using a press brake equipped with a back gauge device that can move the 2 abutting parts independently in a direction perpendicular to the bending line of the bending process and can move away from and in contact with each other along the bending line,
A bent material that is bent to form a curved surface by bending to form a bent product having the curved surface is divided into a base part that will be the bent product and a first abutment that extends outward from the base part as an abutting piece. A shape having a contact piece and a second contact piece,
The first abutment portion and the second abutment portion are abutted against the first abutment surface and the second abutment portion against the second abutment surface. Bending is performed by positioning the material bending line of the bending work to be applied to the bending material so that it coincides with the bending line in a state in which the piece is abutted against the bending material, and the position of the material bending line is shifted for each bending process to a predetermined value. It is a bending method for forming the curved surface by performing the bending process a number of times.

According to one aspect of the present invention, it is easy to perform correction according to the processing position of the table, and an increase in the cost of bent products is suppressed.

FIG. 1 is a right side view of a press brake 1 used when performing the bending method of the present invention. FIG. 2 is a top view of the back gauge device 2 provided in the press brake 1. FIG. FIG. 3 is a block diagram of the control device 16 and the back gauge device 2 of the press brake 1. As shown in FIG. FIG. 4 is a perspective view showing a bent product 5A bent by the bending method of Example 1 using the press brake 1. FIG. FIG. 5 is a plan view showing a developed material 505 in which the bent product 5A is developed. FIG. 6 is a diagram for explaining material folding lines (B201 to B211, B401 to B411) in the expanded material 505. FIG. FIG. 7 is a plan view showing a bent material 5 for bending by the bending method of Example 1 to obtain a bent product 5A. FIG. 8 is a first diagram for explaining the butting mode of the bending material 5 in the bending method of the first embodiment. FIG. 9 is a second diagram for explaining the abutment mode of the bending material 5 in the bending method of the first embodiment. FIG. 10 is a third diagram for explaining the abutment mode of the bending material 5 in the bending method of the first embodiment. FIG. 11 is a diagram for explaining another aspect of the abutting aspect shown in FIG. FIG. 12 is a perspective view showing a bent product 6A bent by the bending method of Example 2. FIG. 13A is a plan view showing a bent material 6 for obtaining a bent product 6A by the bending method of Example 2. FIG. 13B is a plan view showing a bending material 7 that is a modification of the bending material 6. FIG. 14A and 14B are diagrams for explaining the butting mode of the bending material 6 in the bending method of the second embodiment. FIG. 15 is a perspective view showing a bent product 8A bent by the bending method of Example 3. FIG. 16A is a plan view showing a bent material 8 for obtaining a bent product 8A by the bending method of Example 3. FIG. 16B is a plan view showing a bending material 9 that is a modification of the bending material 8. FIG. 17A and 17B are diagrams for explaining the butting mode of the bending material 8 in the bending method of the third embodiment.

(Example 1)
First, a press brake 1 for performing a bending method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a right side view of a press brake 1 used when performing the bending method of the present invention. FIG. 2 is a top view of the back gauge device 2 provided in the press brake 1. FIG. FIG. 3 is a block diagram of the control device 16 and the back gauge device 2 of the press brake 1. As shown in FIG.
In the following description, the front, back, up and down directions are defined as the directions indicated by the arrows in FIG. In FIG. 1, the left direction is the depth direction on the paper surface, and the right direction is the front direction on the paper surface.

As shown in FIGS. 1 and 2, the press brake 1 includes a pair of left and right side plates 11, a lower table 12, an upper table 14, a back gauge device 2, a control device 16, an input device 17, and an output device 18. ing.

The lower table 12 is arranged in the lower part between the pair of side plates 11, 11, and the upper table 14 is arranged in the upper part between the pair of side plates 11, 11 so as to vertically face the lower table 12. It is
One of the lower table 12 and the upper table 14 is fixed, and the other moves up and down with respect to one by a drive mechanism (not shown). For example, the lower table 12 is fixed, and the upper table 14 moves up and down so as to separate and contact the lower table 12 .

A die 13 which is a lower die for bending is detachably attached to the upper surface of the lower table 12 . A punch 15 which is an upper die paired with the die 13 is detachably attached to the lower surface of the upper table 14 . When the press brake 1 is stationary, the die 13 and the punch 15 are vertically separated.
With this configuration, the press brake 1 lowers the punch 15 with respect to the sheet metal bending material 5 inserted from the front side and placed on the upper surface of the die 13 between the die 13 and the punch 15 . Bending can be done through cooperation.
In FIGS. 1 and 2, the position where the bending material 5 is bent in the press brake 1 is indicated by a chain line as a bending line BL.

The back gauge device 2 is a so-called abutment device, and is a device for determining the position of the bending material 5 to be bent in the front-rear direction by abutment during bending.
As shown in FIGS. 1 and 2, the back gauge device 2 has a support beam 21, a left gauge portion 22L and a right gauge portion 22R.
The support beam 21 is a columnar member arranged between the pair of left and right side plates 11, 11 so as to extend in the left-right direction.

As shown in FIG. 2, the left gauge portion 22L and the right gauge portion 22R are independently supported by the support beam 21 so as to be movable in the horizontal direction (see arrow DR1).
The support beam 21 is provided with a first direction left driving portion 21LK for moving the left gauge portion 22L left and right, and a first direction right driving portion 21RK for moving the right gauge portion 22R in the left and right direction. Hereinafter, the left-right direction is also referred to as the first direction, and the front-rear direction is also referred to as the second direction.

The left gauge portion 22L and the right gauge portion 22R are assembly members extending in the front-rear direction.
The left gauge portion 22L has a left gauge base 23L, a left slider 24L, and a second direction left driving portion 23LK.
The left gauge base 23L is a rail-shaped member supported by the support beam 21 so as to be movable in the left-right direction. The left slider 24L is movably supported in the front-rear direction by the left gauge base 23L (see arrow DR2L). The second direction left driving portion 23LK is provided on the left gauge base 23L and moves the left slider 24L in the front-rear direction.

The right gauge portion 22R has a right gauge base 23R, a right slider 24R, and a second direction right driving portion 23RK.
The right gauge base 23R is a rail-shaped member supported by the support beam 21 so as to be movable in the left-right direction. The right slider 24R is movably supported in the front-rear direction by the right gauge base 23R (see arrow DR2R). The second direction right driving portion 23RK is provided on the right gauge base 23R and moves the right slider 24R in the front-rear direction.

As shown in FIG. 3, the first direction left drive section 21LK, the first direction right drive section 21RK, the second direction left drive section 23LK, and the second direction right drive section 23RK are collectively referred to as a gauge drive group 2KG.

As shown in FIGS. 1 and 2, the left slider 24L and the right slider 24R have a left abutting portion 25L and a right abutting portion 25R, respectively, which protrude forward.
The left abutment surface 25La, which is the front end surface of the left abutment portion 25L, and the right abutment surface 25Ra, which is the front end surface of the right abutment portion 25R, depend on the positions of the left slider 24L and the right slider 24R in the front-rear direction. Instead, it is a plane that is always vertical and parallel to the bending line BL indicated by a straight line extending in the left-right direction.
The left abutment portion 25L and the right abutment portion 25R are also referred to as a first abutment portion 25L and a second abutment portion 25R, respectively. The left abutment surface 25La and the right abutment surface 25Ra are also referred to as a first abutment surface 25La and a second abutment surface 25Ra, respectively.

As shown in FIG. 3 , the control device 16 has a central processing unit (CPU) 161 , a storage section 162 , a gauge position acquisition section 163 , a gauge drive section 164 and an output section 165 . FIG. 3 shows the control system of the backgauge device 2, and the drive system for executing the bending of the press brake 1 is omitted.
The storage unit 162 stores bending information J1 and a bending program JP for obtaining various bent products including a bent product 5A, which will be described later.

Specifically, the bending information J1 is the positions of the left slider 24L and the right slider 24R in the front-rear and left-right directions, respectively, associated with each bending line of the bending material 5 (such as the material bending line B401 in FIG. 7). . The bending program JP defines the processing order of a plurality of preset bending lines (such as material bending lines B201 to B211 in FIG. 7). Details of these will be described later.

The gauge position acquisition unit 163 acquires the material bending line for the next bending process and the positions of the left slider 24L and the right slider 24R (hereinafter referred to as gauge (also called position) is obtained by referring to the storage unit 162 .
The gauge drive unit 164 controls the operation of the gauge drive group 2KG, and positions the left slider 24L and the right slider 24R at the gauge positions acquired by the gauge position acquisition unit 163 during bending.

The output unit 165 outputs processing information on the side of the press brake 1, such as the operating state of the control device 16 and the set state of the back gauge device 2, and processing information to be provided to the operator, to the output device 18 as visual or auditory information. output.

An input device 17 is connected to the control device 16 . The input device 17 also has an external communication function, and transmits to the control device 16 an operation instruction input by the operator or an operation instruction received from the outside through communication or the like. In FIG. 1, an input device 17 is integrated with an output device 18 having a display, a speaker, and the like.

Next, the bending method of Example 1, in which the press brake 1 is used to form a curved surface region of a bent product having a curved surface, will be described.
The bent product is the bent product 5A shown in FIG. 4, and the curved surface is part of a conical surface. The unfolded material 505 shown in FIG. 5 is the unfolded material from which the bent product 5A is unfolded. 4 is a perspective view showing a bent product 5A bent by the bending method of Example 1 using the press brake 1. FIG. FIG. 5 is a plan view showing a developed material 505 in which the bent product 5A is developed.

As shown in FIG. 4, the bent product 5A includes an arc-shaped curved edge portion 51A at one end, straight edge portions 53A, 54A, and 55A at the other end, and five side portions AR1A to AR1A as side surfaces connecting them. Has AR5A. In other words, the bent product 5A presents a substantially hood-shaped semi-cylindrical body having side portions including curved surfaces that smoothly connect the arc-shaped end portion on one end side and the rectangular end portion on the other end side.

The side portions AR1A and AR5A are formed as substantially triangular flat plates having corner portions P12A and P61A, which are both end portions of the curved edge portion 51A, on one end side and straight edge portions 53A and 55A on the other end side, respectively.
The side portion AR3A is formed as a substantially triangular flat plate having one end at the central position P51A of the curved edge portion 51A and the other end at the straight edge portion 54A.
One end side of the side portion AR2A is a semicircular arc portion between the corner portion P12A and the position P51A of the curved edge portion 51A, and the other end side is a connection point portion P34A where the straight edge portion 53A and the straight edge portion 54A are connected. It is formed with a curved surface of a part of the conical surface.
One end side of the side portion AR4A is a semicircular arc portion between the corner P61A of the curved edge portion 51 and the position P51A, and the other end side is a connection point portion P45A where the straight edge portion 54A and the straight edge portion 55A are connected. It is formed with a curved surface of a part of the conical surface.

The unfolded material 505 obtained by unfolding the bent product 5A is associated with before and after unfolding by a reference number obtained by omitting A from the end of the reference number attached to the bent product 5A.
In FIG. 5, the boundaries between each of the sides AR1-AR5 are indicated by dashed-dotted boundary lines. Specifically, the boundary between the side portions AR1 and AR2 is the boundary line LN1, the boundary between the side portions AR2 and AR3 is the boundary line LN2, and the boundary between the side portions AR3 and AR4 is the boundary line. At LN3, the boundary between side AR4 and side AR5 is indicated by boundary line LN4.

A bent product 5A is obtained by processing the side portion AR2 and the side portion AR4 of the unfolding material 505 into curved surfaces. For this purpose, a plurality of bending lines are set for the side portion AR2 and the side portion AR4, and the bending process is performed by gradually increasing the bending angle at each bending line.
FIG. 6 shows an example in which a plurality of material bending lines are set for the side portion AR2 and the side portion AR4. That is, FIG. 6 is a diagram for explaining material folding lines (B201 to B211, B401 to B411) in the expanded material 505. FIG.

In this example, the side portion AR2 and the side portion AR4 are each divided into 10 parts by the angle θ, material bending lines B201 to B211 are virtually set to the side part AR2, and material bending lines B401 to B411 are virtually set to the side part AR4. are doing.
The material bending lines B201 and B211 coincide with the boundary lines LN1 and LN2, respectively, and the material bending lines B401 and B411 coincide with the boundary lines LN3 and LN4, respectively.
If the sides AR2A and AR4A of the bent product 5A are conical surfaces, the material bending lines B201-B211 intersect at one point in the lower part of FIG. 6, and the material bending lines B401-411 intersect at one point in the lower part of FIG.

In the bending method of the embodiment of the present invention, the bending material for obtaining the bent product 5A is composed of the basic portion 50 corresponding to the expanded material 505, the abutting piece 57 extending outward from the basic portion 50, and the abutting piece. 58 and the bending material 5.
The base portion 50 is a portion that will become the bent product 5A, and the abutment pieces 57 and 58 are portions that are cut in the final stage of forming the bent product 5A.
Hereinafter, the abutment piece 57 and the abutment piece 58 to be cut are collectively referred to as an abutment piece portion 50h (see FIG. 7). The abutment piece 57 is also called a first abutment piece 57 and the abutment piece 58 is also called a second abutment piece 58 .

FIG. 7 is a plan view showing the bending material 5. FIG. Specifically, FIG. 7 is a plan view showing a bent material 5 to be bent by the bending method of the embodiment to obtain a bent product 5A. Virtually set material bending lines B201 to B211 and B401 to B411 are indicated by dashed lines on the bending material 5 in FIG.

In the bending material 5, the abutting pieces 57 and 58 are added to the side edges 52 and 56 at positions closer to the curved edge 51 side.
The abutment piece 57 has a triangular shape with an abutment top portion 571 at its tip and side portions 572 and 573 as a pair of side edges.
The abutment piece 58 has a triangular shape with an abutment top portion 581 at its tip and side portions 582 and 583 as a pair of side edges.
The abutment apexes 571 and 581 may be pointed, or may be arc-shaped as in this example.

The abutments 57, 58 are cut off from the side edges 52, 56, respectively, at the final stage of the forming process of the bent product 5A. For this reason, slits 57S and 58S are formed to narrow the portions connecting to the side edges 52 and 56 in order to facilitate the cutting.
Of the triangular side portions 572 and 573 of the abutting piece 57, the side portion 572 on the straight edge portion 53 side may be parallel to the boundary line LN3, that is, the material bending line B401. Of the triangular side portions 582 and 583 of the abutting piece 58, the side portion 582 on the straight edge portion 55 side may be parallel to the boundary line LN2, that is, the material bending line B211. In this example, the bending material 5 has a symmetrical shape in FIG.

As shown in FIG. 7, the connection points P34 and P45 are rounded in an arc shape. Connection points between the arcuate end portions of the connection point portion P34 and the straight edge portions 53 and 54 are connection points P341 and P342, respectively. are defined as connection points P451 and P452, respectively.
Boundary lines LN1 and LN2 have end points at connection points P341 and P342, respectively, and boundary lines LN3 and LN4 have end points at connection points P451 and P452, respectively.

In the storage unit 162 of the control device 16, a bent product obtained by bending, a bent material for obtaining the bent product, and a procedure for bending the bent material are linked and stored in advance.
For example, when obtaining the above-described bent product 5A, bending material information specifying the bending material such as the outer shape, dimensions, and material of the bending material 5 is stored in advance.
The output unit 165 of the control device 16 displays the bending material information of the bending material to be used for the next bending process on the output device 18 .

In addition, the storage unit 162 stores gauge positions including position information of the left slider 24L and the right slider 24R of the back gauge device 2 corresponding to the material bending lines B201 to B211 and B401 to B411, respectively, when bending is performed. Information J2 is stored (see FIG. 3).
In addition, in the storage unit 162, planar view images of the state in which the bending material 5 is abutted against the left slider 24L and the right slider 24R in the bending process at each of the material bending lines B201 to B211 and B401 to B411 are provided to the operator. is stored as support information for

The bending program JP stored in the storage unit 162 defines at least the order of bending of a plurality of material bending lines.

The configuration of the press brake 1 described above and a method of bending the bending material 5 based on information stored in advance in the storage unit 162 will be described with reference to FIGS. 8 to 10. FIG. FIG. 8 is a first diagram for explaining the butting mode of the bending material 5 in the bending method of the first embodiment. FIG. 9 is a second diagram for explaining the abutment mode of the bending material 5 in the bending method of the first embodiment. FIG. 10 is a third diagram for explaining the abutment mode of the bending material 5 in the bending method of the first embodiment.

First, as shown in FIG. 8, the material bending line B411 of the bending material 5 is bent based on the instructions of the bending program JP.
The gauge position acquisition unit 163 acquires gauge position information J2 for bending the material bending line B411 stored in the storage unit 162 .
The gauge position information J2 includes, for example, the distance DLa, the distance Da, and the distance La shown in FIG. These are information that determine the set state of the back gauge device 2 when bending the bending material 5 along the material bending line B411.

The distance DLa is the distance in the front-rear direction from the left abutting surface 25La to the bending line BL in top view. The distance Da is the distance in the front-rear direction between the left abutment surface 25La and the right abutment surface 25Ra in top view. The distance La is determined by abutting the abutment piece 57 of the bending material 5 against the left abutment surface 25La at the abutment point P57 of the abutment top 571, and abutting the connection point portion P23 against the right abutment surface 25Ra at the abutment point P23t. It is the distance in the left-right direction in top view between the abutting point P57 and the abutting point P23t when the ball is hit.
The distance DLa, the distance Da, and the distance La are set so that the material bending line B411 of the bending material 5 coincides with the bending line BL of the press brake 1 in this abutting state.

That is, an operator or a robot hand aligns the abutting piece 57 of the bending material 5 and the connecting point portion P23, which is the convex tip of the basic portion 50 of the bending material 5, with the left abutting portion 25L of different abutting portions. and the right abutment surface 25Ra of the right abutment portion 25R. As a result, the material bending line B411 coincides with the bending line BL of the press brake 1, and the bending material 5 is set.

When an operator instructs a bending operation using a foot switch (not shown) or the like, the CPU 161 operates an elevation drive system (not shown) to move the upper table 14 based on the bending information J1 and the bending program JP. Then, the material bending line B411 of the bending material 5 is bent at a predetermined bending angle.

A plurality of material bending lines of the side portion AR4 are sequentially bent by the same procedure.
For example, when bending along the k-th material bending line B4k (k is an integer of 2 or more and 10 or less) among the material bending lines B401 to B411, an abutting state as shown in FIG. 9 is obtained. FIG. 9 is a second diagram for explaining the abutment mode of the bending material 5 in the bending method of the embodiment.

When bending the material bending line B4k, the gauge position acquisition unit 163 acquires gauge position information J2 linked to the material bending line B4k, which is stored in the storage unit 162. FIG.
Specifically, they are the distance DLk, the distance Dk, and the distance Lk shown in FIG. These are information that determine the setting state of the back gauge device 2 when bending the bending material 5 along the material bending line B4k.

The distance DLk is the distance in the front-rear direction from the left abutting surface 25La to the bending line BL in top view. The distance Dk is the distance in the front-rear direction between the left abutment surface 25La and the right abutment surface 25Ra in top view. The distance Lk is the abutment distance when the abutment piece 57 of the bending material 5 abuts against the left abutment surface 25La at an abutment point P57, and the connection point portion P23 abuts against the right abutment surface 25Ra at an abutment point P23t. It is the distance in the left-right direction in top view between the abutment point P57 and the abutment point P23t.

The distance Lk is determined by the width of the left abutment portion 25L in the left-right direction and the right abutment portion 25L so that the abutment piece 57 and the connection point portion P23 can be reliably abutted against the left abutment surface 25La and the right abutment surface 25Ra, respectively. It is set in advance based on the lateral width of the portion 25R. The same applies to distances Lb and Lb1, which will be described later and correspond to the distance La.

The distance DLk, the distance Dk, and the distance Lk are determined by abutting the connecting point portion P23 of the bending material 5 against the right abutting surface 25Ra, and abutting the abutting top portion 571 of the abutting piece 57 of the bending material 5 against the left abutting surface 25La. The material bending line B4k of the bending material 5 is set to coincide with the bending line BL of the press brake 1 when applied.

When the operator instructs bending with a foot switch (not shown) or the like while the bending material 5 is in the abutting state shown in FIG. The upper table 14 is lowered by the system, and the material bending line B4k of the bending material 5 is bent at a predetermined bending angle.

FIG. 10 shows the abutment state in the bending process of the last material bending line B401 of the side portion AR4 where k=1 when the bending process at the material bending line B4k is performed in the descending order of k in this way. is. FIG. 10 is a third diagram for explaining the abutment mode of the bending material 5 in the bending method of the first embodiment.

The gauge position acquisition unit 163 acquires gauge position information J2 for bending the material bending line B401 stored in the storage unit 162 .
Gauge position information J2 includes, for example, distance DLb, distance Db, and distance Lb shown in FIG. These are information that determine the set state of the back gauge device 2 when bending the bending material 5 along the material bending line B401.

The distance DLb is the distance in the front-rear direction from the left abutting surface 25La to the bending line BL in top view. The distance Db is the distance in the front-rear direction between the left abutment surface 25La and the right abutment surface 25Ra in top view. The distance Lb is the abutment distance when the abutment piece 57 of the bending material 5 abuts against the left abutment surface 25La at an abutment point P57, and the connection point portion P23 abuts against the right abutment surface 25Ra at an abutment point P23t. It is the distance in the left-right direction in top view between the abutment point P57 and the abutment point P23t.
Here, FIG. 10 shows a case where the side part 572 of the abutting piece 57 of the bending material 5 is formed parallel to the material bending line B401. In this case, the side portion 572 and the left abutment surface 25La are abutted not by point contact but by line contact when viewed from above, which is a plan view. The abutting point P57 indicates the end point on the tip side of the line contact range.

The distance DLb, the distance Db, and the distance Lb are determined by abutting the connecting point portion P23 of the bending material 5 against the right abutting surface 25Ra, and abutting the abutting top portion 571 of the abutting piece 57 of the bending material 5 against the left abutting surface 25La. The material bending line B401 of the bending material 5 is set to coincide with the bending line BL of the press brake 1 when applied.

As a result, an operator or the like can align the abutment piece 57 of the bending material 5 and the connection point portion P23, which is the convex tip of the base portion 50, with the left abutment surface 25La and the right abutment surface 25La, which are different abutment portions. 25Ra, the material bending line B401 coincides with the bending line BL of the press brake 1, and the bent material 5 is set in the abutting state.

Then, when the operator instructs a bending operation with a foot switch or the like while the bending material 5 is abutted, the CPU 161 operates an elevation drive system (not shown) based on the bending information J1 and the bending program JP to operate the upper table. 14 is lowered to bend the material bending line B401 of the bending material 5 at a predetermined bending angle.

As shown in FIG. 11, the material bending lines B401 to B411 are bent by abutting the abutting piece 58 and the connecting point portion P56 of the base portion 50 against the right abutting surface 25Ra and the left abutting surface 25La, respectively. good too. FIG. 11 is a diagram for explaining another aspect of the abutting aspect shown in FIG.
In this case, the positions of the left abutment surface 25La and the right abutment surface 25Ra of the back gauge device 2 are determined by distances Db1, DLb1, and Lb1 corresponding to the distances Db, DLb, and Lb, respectively.

As described above, in the bending method of the first embodiment, the bending material 5 is provided with the base portion 50 and the abutment piece portion 50h, and a pair of abutment surfaces 25a (see FIG. 2) of the back gauge device 2 are provided. The positions of the abutting surfaces 25La and 25Ra, which are surfaces, can be moved in the front-rear direction and the left-right direction so as to be independently determined.
Then, the positions of the abutment surface 25La and the abutment surface 25Ra are linked to the positions of the bending lines of the bending material 5 to be bent next, and are positioned at respective preset positions. Then, one of the positioned abutment surfaces 25La and 25Ra is abutted against the base portion 50, and the other is abutted against the abutment piece portion 50h to create an abutment set state, and bending is performed in the abutment set state. is.
Further, the curved surface is formed by performing the above-described folding for each of the set material folding lines. Then, at the final stage after the bending process is completed, the abutment piece 50h is cut off to obtain the bent product 5A.

Thereby, the bending material 5 can make the abutment piece 50h smaller. Therefore, the material required to obtain the bent product 5A is reduced, and the cost increase of the bent product 5A is suppressed. In addition, since the distance between the two abutting positions in the left-right direction (for example, the distance La in FIG. 8) can be increased, the angle error of the bending position can be reduced, and highly accurate bending can be performed.

Further, the positions of the material bending lines can be adjusted in the front-rear direction by translating the abutment surfaces 25La and 25Ra of the back gauge device 2 in the front-rear direction.
As a result, the horizontal position of the bending process on the lower table 12 of the press brake 1 can be set substantially at the center. Therefore, conventionally, the correction, which was conventionally performed according to the machining position in the left-right direction with respect to the table, becomes simple and easy. Correction may not be necessary in some cases.

The position where the abutment piece 50h is formed with respect to the basic portion 50 is not limited to the side edge portions 52 and 56 as in the bending material 5 . It can be freely set according to the shape of the bent product 5A.

(Example 2)
12, 13A, 13B, and 14, the bending product 6A, the bending material 6 of the second embodiment for obtaining the bending product 6A, and a modification of the bending material 6 will be described.
That is, FIG. 12 is a perspective view showing a bent product 6A bent by the bending method of Example 2. As shown in FIG. 13A is a plan view showing a bent material 6 for obtaining a bent product 6A by the bending method of Example 2. FIG. 13B is a plan view showing a bending material 7 which is a modification of the bending material 6. FIG. 14A and 14B are diagrams for explaining the butting mode of the bending material 6 in the bending method of the second embodiment.

As shown in FIG. 12, the bent product 6A presents a substantially hood-like semi-cylindrical body having a longer end-to-end distance than the bent product 5A.
The bent product 6A has a curved edge portion 61A, side edge portions 62A and 66A, and a straight edge portion 63A (not shown), 64A and 65A. Bent product 6A has sides AR1A-AR5A similar to bent product 5A.

As shown in FIG. 13A, the bending material 6 for obtaining the bent product 6A includes a basic portion 60 which will be the bent product 6A, and a straight edge portion 64 formed on the basic portion 60 opposite to the curved edge portion 61. and a contact piece portion 60h. In this example, the abutment piece portion 60h is a pair of abutment pieces 67, 68 formed near both ends of the straight edge portion 64. As shown in FIG. The abutment pieces 67 and 68 have the same shape, extend outward in a narrow width in a direction perpendicular to the straight edge portion 64, and have arcuate tip portions.

As shown in FIG. 13B, a bending material 7, which is a modification of the bending material 6, has an abutting piece 70h instead of the abutting piece 60h of the bending material 6. As shown in FIG.
The abutment piece portion 70h has abutment pieces 77 and 78 corresponding to the abutment pieces 67 and 68 of the bending material 6, and a connecting portion 79 that connects the base sides of the abutment pieces 77 and 78. As shown in FIG.
In this way, since the abutment surfaces 25La and 25Ra of the back gauge device 2 are abutted against the arcuate portions of the tips of the abutment pieces, other portions do not interfere with other members during bending. It can transform into any shape you like.

As with the bending material 5, the bending material 6 is bent by setting a plurality of material bending lines on the side portions AR2 and AR4 to form a desired curved surface. In positioning the bending material 6 during the bending process, as shown in FIG. 67, the abutment piece 68 is abutted;
As in the first embodiment, the base portion 50 is abutted against one of the abutment surfaces 25La, 25Ra of the back gauge device 2, and the abutment piece is abutted against the other. The abutment pieces 67 and 68 may be abutted against both abutment surfaces 25La and 25Ra of the gauge device 2 to position the bending material 6 .

(Example 3)
15, 16A, 16B, and 17, the bending product 8A, the bending material 8 of Example 3 for obtaining the bending product 8A, and the modification of the bending material 8 are demonstrated. FIG. 15 is a perspective view showing a bent product 8A bent by the bending method of Example 3. FIG. 16A is a plan view showing a bent material 8 for obtaining a bent product 8A by the bending method of Example 3. FIG. 16B is a plan view showing a bending material 9 that is a modification of the bending material 8. FIG. 14A and 14B are diagrams for explaining the butting mode of the bending material 8 in the bending method of the third embodiment.

As shown in FIG. 15, the bent product 8A presents a substantially hood-like semi-cylindrical body having a shorter end-to-end distance than the bent product 5A.
The bent product 8A has a curved edge portion 81A, side current portions 82A and 86A, and a straight edge portion 83A (non- shown), 84A and 85A. The bent product 8A has sides AR1-AR5 like the bent product 5A.

As shown in FIG. 16A, the bending material 8 for obtaining the bent product 8A includes a basic portion 80 which will be the bent product 8A, and a straight edge portion 84 formed on the basic portion 80 opposite to the curved edge portion 81. and a contact piece portion 80h. In this example, the abutment piece portion 80h is a pair of abutment pieces 87, 88 formed near both ends of the straight edge portion 84. As shown in FIG. The abutting pieces 87, 88 are formed with different shapes.
The abutting piece 87 is formed in a substantially L shape extending in a narrow width in the outer direction orthogonal to the straight edge portion 84 and bent at right angles to the straight edge portion 83 side, and the tip thereof is formed in an arc shape. It is Also, the tip of the abutting piece 87 crosses the imaginary line extending from the straight edge portion 83 and is positioned outside the imaginary line.
The abutment piece 88 extends outward in a narrow width in a direction perpendicular to the straight edge portion 84 and has an arcuate tip.

As shown in FIG. 16B, a bending material 9, which is a modification of the bending material 8, has an abutting piece 90h instead of the abutting piece 80h of the bending material 8. As shown in FIG.
The abutment piece portion 90h has abutment pieces 97 and 98 corresponding to the abutment pieces 87 and 88 of the bending material 8, and a connecting portion 99 that connects the base sides of the abutment pieces 97 and 98. As shown in FIG. Since the arcuate portions of the tip of the abutment piece 87 and the abutment piece 88 are abutted against the left abutment surface 25La and the right abutment surface 25Ra of the back gauge device 2, the other portions are bent. It can be transformed into any shape as long as it does not interfere with other members.

As with the bending material 5, the bending material 8 is formed into a desired curved surface by setting a plurality of material bending lines on the side portions AR2 and AR4 and performing bending. In positioning the bending material 8 during the bending process, as shown in FIG. The abutting pieces 87 and 88 abut against each other.
The bending material 9 is also formed so that the bending material 9 is positioned by abutting abutting pieces against both abutting surfaces 25La and 25Ra of the back gauge device 2 .

Similarly to the first embodiment, the bending methods of the second and third embodiments suppress the cost increase of the bent products 5A and 8A. In addition, highly accurate bending can be performed.
In addition, the position of the bending process in the left-right direction of the lower table 12 of the press brake 1 can be set substantially at the center. Therefore, conventionally, the correction, which was conventionally performed according to the machining position in the left-right direction with respect to the table, becomes simple and easy. Correction may not be necessary in some cases.

The embodiments of the present invention are not limited to the configurations described above, and modifications may be made without departing from the gist of the present invention.
The shape of the bent product is not limited to the shape of the bent products 5A, 6A, 8A described above. That is, the shape of the bending material is not limited to the bending materials 5 to 9 described above, and the shape and number of the abutting pieces forming the abutting piece portion 50h are not limited either. The abutting piece may be provided with a plurality of, for example, arc-shaped extending portions that can be abutted against the abutting surface of the back gauge device 2 .

For example, the abutment apexes 571 and 581 of the abutment pieces 57 and 58 in the bending material 5 are not limited to being arcuate, and may be arcuate or pointed. From the viewpoints of easiness of formation by laser processing or press working when forming the abutment pieces 57 and 58 and prevention of deformation of the abutment tops 571 and 581 due to abutment, an arc shape is used rather than a pointed shape. Better to have Further, the circular arc shape is preferable because the calculation of the abutment position with respect to the abutting surface portions 27La and 27Ra is facilitated.
The same applies to the other bending materials 6-9.

Reference Signs List 1 press brake 11 side plate 12 lower table 13 die 14 upper table 15 punch 16 controller 161 central processing unit (CPU)
162 storage unit 163 gauge position acquisition unit 164 gauge drive unit 165 output unit 17 input device 18 output device 2 back gauge device 2KG gauge drive group 21 support beam 21LK first direction left drive unit 21RK first direction right drive unit 22L left gauge unit 22R right gauge portion 23L left gauge base 23LK second direction left driving portion 23R right gauge base 23RK second direction right driving portion 24L left slider 24R right slider 25a abutment surface 25L left abutment portion 25La left abutment surface 25R right abutment Part 25Ra Right abutting surface 5, 6, 7, 8, 9 Bending material 5A, 6A, 8A Bending product 50, 60, 80 Base part 50h, 60h, 70h, 80h, 90h Abutting piece part 505 Development material 51, 51A , 61A, 61, 81A, 81, 91 curved edges 52, 56, 52A, 56A, 62A, 66A, 82A, 86A, side edges 53 to 55, 53A to 55A, 63A to 65A, 83A to 85A straight edges 57, 58, 67, 68, 77, 78, 87, 88, 97, 98 Abutment pieces 57S, 58S Slits 571, 581 Abutment tops 572, 573, 582, 583 Sides 79, 99 Connecting parts AR1A to AR5A , AR1 to AR5 Side portion BL Bending lines B201 to B211, B401 to B411, B4k Material bending lines Da, DLa, La, Dk, DLk, Lk, Db, DLb, Lb, Db1, DLb1, Lb1 Distance J1 Bending information J2 Gauge position information JP Bending program LN1 to LN4 Boundary lines P12A, P61A Corners P23, P34, P34A, P45, P45A, P56 Connection points P341, P342, P451, P452 Connection point P51A Positions P57, P23t Abutment point θ angle

Claims (4)

a first abutment portion and a second abutment portion having a first abutment surface and a second abutment surface as abutment surfaces, respectively; Using a press brake equipped with a back gauge device capable of independently moving the butting part in a direction orthogonal to the bending line of the bending process and moving away from and in contact with each other along the bending line,
A curved surface is formed by bending to form a bent product having the curved surface. ,
The first abutment portion and the second abutment portion are in a state in which the abutment piece abuts against the first abutment surface and the base portion abuts against the second abutment surface. and performing the bending process by positioning the material bending line of the bending process applied to the bending material so as to coincide with the bending line, and performing the bending process a predetermined number of times while shifting the position of the material bending line for each bending process. A bending method that forms a curved surface. a first abutment portion and a second abutment portion having a first abutment surface and a second abutment surface as abutment surfaces, respectively; Using a press brake equipped with a back gauge device capable of independently moving the butting part in a direction orthogonal to the bending line of the bending process and moving away from and in contact with each other along the bending line,
A bent material that is bent to form a curved surface by bending to form a bent product having the curved surface is divided into a base part that will be the bent product and a first abutment that extends outward from the base part as an abutting piece. A shape having a contact piece and a second contact piece,
The first abutment portion and the second abutment portion are abutted against the first abutment surface and the second abutment portion against the second abutment surface. Bending is performed by positioning the material bending line of the bending work to be applied to the bending material so that it coincides with the bending line in a state in which the piece is abutted against the bending material, and the position of the material bending line is shifted for each bending process to a predetermined value. A bending method for forming the curved surface by performing the bending process a number of times. 3. The bending method according to claim 1, wherein the tip portion of the abutment piece is abutted against the abutment surface by point contact. 4. The bending method according to any one of claims 1 to 3, wherein after the bending for forming the curved surface is finished, the abutment piece is cut off to obtain the bent product.

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