JPH06304664A - Method and device for bending metal plate - Google Patents

Abstract

PURPOSE:To automatically and smoothly bend a cylindrical body by passing the material between an upper roll and two lower rolls and suitably ascending, descending and rolling forward and backward. CONSTITUTION:An upper roll 10 ascending and descending along a vertical line passing though a center axis step by step, and two lower rolls 12, 14 arranged on the inlet and outlet sides of a subject to be worked with the vertical line between are provided. Two lower rolls are made displacing as one body, and each roll is made reversible forward and backward. A metal plate 16 is passed between the upper and lower rolls, and cylindrically bent in the almost complete roundness or the ellipse. In this time, the metal plate 16 is fed forward and backward by synchronously rotating the upper and lower rolls forward and backward, and together both lower rolls 12, 14 are displaced as one body in a prescribed timing to the material feeding direction or the opposite feeding direction. Then each roll is suitably ascended, descended and reversed forward and backward and the cylinder like bending is executed. Therefore, the bending process can be operated without handling of the expert and operating of passing it to many rolls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for cylindrically bending a metal plate, and more specifically, it comprises one upper roll and two lower rolls arranged diagonally below the upper roll and on the left and right. A method for bending a metal plate of a required length into a cylinder having a cross section close to a perfect circle or a cylinder having an elliptical cross section by a roll bender and a device suitably used for carrying out the method. It is about.

[0002]

2. Description of the Related Art A metal plate of a required length is passed between one upper roll and two lower rolls disposed diagonally below and on the left and right of the upper roll. Bending rolls that give a cylindrical bending process to the metal plate by a lower roll are widely known. With regard to the basic structure of this roll bender, in order to efficiently bend a metal plate as an object to be processed with good accuracy, for example, as shown in Japanese Patent Publication No. 37-1570, the lower roll is placed in the horizontal direction. And configured to be able to shift left and right,
Further, as shown in Japanese Patent Publication No. 46-7451, there is implemented a structure in which an upper roll is raised or lowered within a predetermined range along a vertical line passing through the central axis of the roll.

[0003]

The following problems are pointed out when bending a metal plate into a cylindrical body having a perfect circle or ellipse in cross section by using a conventionally known roll bender. That is, the intermediate region of the metal plate excluding the front end portion and the rear end portion can be bent with high accuracy by a conventional roll bender. However, the portion near the leading end and the portion near the rear end of the metal plate are not formed into an accurate arc by the first roll bending process in the roll bender, and this portion is repeatedly passed between the upper and lower rolls. Needs correction work. For example, FIG.
As shown in, one upper roll 10 and two lower rolls 1
A metal plate 1 having a required length is formed by a roll bender composed of 2 and 14 (a plurality of backup rolls is further provided on the lower roll, but this is not shown).
When 6 is bent into a cylindrical body having a substantially perfect circular cross section, the intermediate portion of the metal plate 16 excluding the front end portion 16a and the rear end portion 16b has a cylindrical body of sufficient precision in the present technology. Is molded into. However, as shown in FIG. 29, the metal plate 1
As a preparatory step for bending 6, the front end portion 16a of the metal plate 16 which is a straight plate material of the lower roll 14 (since the material to be processed is on the side where this is called, is commonly referred to as the "outside" lower roll). When the bending work is carried out while being positioned above and clamped with the upper roll 10, the tip portion 16
The area a remains as a straight area. Similarly, the rear end portion 16b of the metal plate 16 also remains as a straight region that is not bent.

The front end portion 16a and the rear end portion 16b of the metal plate 16 also need to be finally bent so as to have the same curvature as the intermediate portion of the main body. Therefore, the metal plate 16 is repeatedly passed between the upper and lower rolls of the roll bender to gradually finish to a desired curvature.
At present, this requires a lot of time and effort by a skilled person. Further, the bending work of a cylindrical body having a substantially perfect circle in cross section can be finished to a considerable finishing accuracy by the conventional bending roll, though it takes a lot of labor and time described above. However, in order to bend an elliptic cylindrical body having an elliptical cross section, in a conventional roll bender, a skilled worker needs to perform the rolling process manually many times while observing it with great care.
As described above, it is extremely difficult to perform the fully automatic bending of the elliptic cylinder.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to perform the bending process of a cylindrical body whose cross section is a substantially perfect circle or an elliptic cylinder whose cross section is an ellipse, which requires a lot of labor for a skilled person and many roll passing operations. It is an object of the present invention to provide a circular arc bending method of a metal plate that can be fully automatically and smoothly performed as a series of strokes, and an apparatus that can suitably perform this.

[0006]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and to suitably achieve an intended purpose, the present invention provides an upper roll which can be raised and lowered in stages along a perpendicular line S ₀ passing through a central axis. ,
It is composed of two lower rolls respectively arranged on the inlet side and the outlet side of the material to be processed with the perpendicular line S ₀ interposed therebetween, and the two lower rolls are in the material feeding direction or the anti-feeding direction with reference to the perpendicular line S ₀ . In a bending method in which a metal plate, which is a material to be processed, is passed between the upper roll and the two lower rolls and which is displaceable integrally, and a cylindrical bend is applied to the metal plate, the metal plate is moved up and down. The metal plate is lightly clamped by the upper roll located at the reference position C ₀ and the two lower rolls displaced in the material feeding direction by the distance S + from the reference position S ₀ at the time of displacement, and the tip of the metal plate is clamped. Is placed on the upper surface of the lower roll located on the material delivery side, the upper roll and the two lower rolls are simultaneously driven in the forward direction, and the upper roll is lowered from the reference position C ₀ , whereby the metal plate Bending while feeding in the feeding direction The processing is advanced, the upper roll is stopped at a position lower than the reference position C ₀ by a distance C _1, and the normal rotation drive of the upper roll and the two lower rolls is continued and the arc required for the metal plate is continued. Is formed, and the metal plate is fed by a required set amount L ₁ so that the rear end of the metal plate reaches near the upper surface of the lower roll on the material entering side, and then the upper roll and the two lower rolls are The forward rotation drive is stopped, and if necessary, the upper roll is further lowered from the distance C ₁ to a distance C ₂ ′, and the rear end of the metal plate which is positioned near the upper surface of the lower roll on the material-entry side. After the bending is performed by additionally pressurizing the portion, the upper roll is raised from the distance C ₂ 'to the distance C ₃ , and the upper roll and the two lower rolls are simultaneously driven in reverse to produce the metal. Plate is the required set amount L ₂
After that, the rear end portion of the metal plate is positioned slightly off from the lower roll on the material-entry side, and the two lower rolls are displaced from the reference position S ₀ by a distance S− in the counter-feed direction. , The upper roll is lowered from the distance C ₃ to the distance C ₂ , and the upper roll is in the lowered position of the distance C ₂ ,
Reverse driving of the upper roll and the two lower rolls is started, the metal plate is bent and fed by a required set amount L ₃ , and the tip of the metal plate is near the upper surface of the lower roll on the material exit side. At that time, the reverse rotation is stopped, and the tip of the metal plate, which is located near the upper surface of the lower roll on the material exit side, is additionally moved by lowering the upper roll to a distance C ₂ ′. After pressurizing and bending, the upper roll is raised from the distance C ₂ ′ to the distance C ₂ , and the upper roll and the two lower rolls are simultaneously driven in the normal direction to set the metal plate to a required setting. By returning by the amount L _4, the tip of the metal plate is positioned slightly off from the lower roll on the material exit side in the material feeding direction, and after the upper roll is raised from the distance C ₂ to the distance C ₃ , wherein the two lower rolls, the distance S- to the reference position S ₀ material Ri is displaced in the direction, along with lowering the on the roll from a distance C ₃ to a distance C _4, and performing a finishing winding the upper roll and simultaneously driven forward and reverse drive and two lower rolls .

Similarly, in order to solve the intended problem and preferably achieve the above object, another invention of the present application is to provide an upper roll which can be raised and lowered stepwise along a perpendicular line S ₀ passing through the central axis. It is composed of two lower rolls respectively arranged on the inlet side and the outlet side of the material to be processed with the perpendicular line S ₀ interposed therebetween, and the two lower rolls are integrated in the material feeding direction or the anti-feeding direction with reference to the perpendicular line S _0. Is displaceable, and a metal plate as a material to be processed is passed between these upper rolls and two lower rolls,
In the bending method for imparting an elliptic cylindrical shape to this metal plate, an upper roll located at a reference position C ₀ during lifting and lowering,
The metal plate is lightly clamped by the two lower rolls displaced in the material feeding direction by the distance S + from the reference position S ₀ at the time of displacement, and the tip of the metal plate is placed on the upper surface of the lower roll located on the material discharge side. The upper roll and the two lower rolls are driven to rotate at the same time in the forward direction at the same time, and the upper roll is lowered from the reference position C ₀ to advance the bending while feeding the metal plate in the material feeding direction. The metal plate is fed by the required set amount L ₁ , and the upper roll is moved to its reference position C _0.
When the distance between the upper roll and the two lower rolls is stopped by stopping the lowering of the upper roll at the time when the metal plate is lowered by the distance C ₁ , the metal plate is fed by the required set amount L _2. To form the required arc, and the upper roll and 2
By continuing the normal rotation drive with the two lower rolls and raising the upper roll from the distance C ₁ , the arc formed by feeding the metal plate by the required set amount L ₃ is gradually changed, The roll is stopped when it rises from the distance C ₁ to a distance C ₂ which is a predetermined processing position, and the normal rotation drive of the upper roll and the two lower rolls is continued to keep the metal plate at a required set amount L. _By feeding only ₄ to form a required arc, the forward rotation of the upper roll and the two lower rolls and the lowering of the upper roll are simultaneously advanced to move the metal plate by the required set amount L _5. The arc formed by feeding is gradually changed, the upper roll is lowered from the distance C ₂ to a distance C ₁ which is a predetermined processing position and stopped, and the normal rotation drive of the upper roll and the two lower rolls is continued. By doing Set the metal plate to the required set amount L ₆
To form a desired arc, and the normal rotation drive of the upper roll and the two lower rolls and the upward movement of the upper roll are simultaneously advanced to move the metal plate to a required set amount L ₇
It is characterized in that the arc formed by feeding only is gradually changed, and when the upper roll has risen from the distance C ₁ to a distance C ₂ which is a predetermined processing position, the upper roll is stopped from rising.

Further, the bending apparatus according to the present invention for suitably carrying out these methods for bending a metal plate has an upper roll and an entrance side of a material to be processed with a perpendicular line passing through a center line of the upper roll sandwiched therebetween. It consists of two lower rolls respectively arranged on the output side and the output side, and a metal plate, which is a material to be processed, is passed between these upper rolls and two lower rolls to give the required bending to the metal plate. In the bending device, a measuring roll having a small diameter is arranged in parallel with both rolls in a space formed between the two lower rolls so as to be vertically movable and rotatable, and the measuring roll is rotated at one end thereof. A pulse generating means is provided, and when it rises, it extends slightly above the pass line of the metal plate and can abut against the metal plate, and a pulse corresponding to the feed amount in the forward direction or the backward direction of the metal plate. The rotation Characterized by being configured to generate the pulse generating means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method for bending a metal plate and an apparatus therefor according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. Since the basic configuration of the roll bender is the same as that shown in FIG. 28, the same members are designated by the same reference numerals. The upper roll 10 of the roll bender used here can be raised and lowered in stages along a vertical line S ₀ passing through the central axis thereof, and the lower roll positioned diagonally on the right side of the vertical line S ₀ of the upper roll 10. 12 lower roll 14 which is located diagonally left across the (material entry side) and said vertical line S ₀ (material exit side), the perpendicular line relative to the S _0, the material feed direction (+) or anti-feed direction (- ) Can be integrally displaced. The bending method according to the present invention includes an operation in which the upper roll 10 moves up and down stepwise at a required timing along the perpendicular line S ₀ , and
The two lower rolls 12 and 14 are metal plates 1 based on the vertical line S _0.
6 and the operation of integrally displacing in the feed direction or the counter feed direction at a required timing. Further, the bending method can be divided into a method of bending a metal plate into a cylindrical body having a perfect circular cross section and a method of bending into an elliptic cylindrical body having an elliptical cross section. The description will be made separately. In addition, a lifting mechanism for the upper roll 10 and 2
The displacement driving mechanism of the two lower rolls 12 and 14 has a known structure and will not be described.

(Method of Bending to Form Cylindrical Body with Cross Section) In the case of bending the metal plate 16 into a cylindrical body with a substantially round cross section, in this embodiment, basically, It is implemented via each process shown in FIGS. That is, FIG. 1 shows a first stage of a process of imparting a cylindrical bend to a metal plate 16 having a required length.
Is fed horizontally to the left in the figure, and a portion 16a near its tip is positioned on the upper surface of the lower roll 14 on the material delivery side. At this time, the metal plate 1
The tip portion 16a of 6 is fixedly positioned. Top roll 1
0 is located at the reference position C ₀ when the upper roll 10 moves up and down, and the two lower rolls 12 and 14 are located at the reference position S ₀ when the lower rolls are displaced (this is the central axis of the upper roll 10). The position is displaced by the distance S + in the material feeding direction (+) rather than the position where the perpendicular line passing through (matches the passing position). Therefore, the metal plate 1
6 is in a state of being lightly clamped by the upper roll 10 located at the reference position C ₀ and the two lower rolls 12 and 14 and stands by for the next step.

As shown in FIG. 2, while the metal plate 16 is lightly clamped by the upper and lower roll groups, the upper roll 10
And the two lower rolls 12 and 14 are simultaneously driven in the forward direction, and the operation of lowering the upper roll 10 from the reference position C ₀ is started. As a result, the bending of the metal plate 16 is gradually advanced under the pressure of the upper roll 10 while being fed in the material feeding direction (+). As shown in FIG. 3, when the upper roll 10 is lowered, the upper roll 10 is moved to the reference position C _0.
Stop at the processed position up to a further distance C ₁ . However, the normal rotation drive of the upper roll 10 and the two lower rolls 12 and 14 is continued. As a result, a desired arc is formed on the metal plate 16. Then, the metal plate 16 is
As shown in FIG. 5, the predetermined amount L ₁ is fed, and the vicinity 16b of the rear end portion of the metal plate 16 is fed to the lower roll 12 on the material entering side.
When it reaches the upper surface, the forward rotation drive of the upper roll 10 and the two lower rolls 12 and 14 is stopped. That is, the vicinity 16b of the rear end portion of the metal plate 16 is located near the upper surface of the lower roll 12 on the material entering side, and the main body part of the metal plate 16 is located on the upper surface of the lower roll 14 on the material exiting side. , The rolling force is received from the upper roll located at the distance C ₁ .

In this state, as shown in FIG. 5, if necessary, the upper roll 10 is lowered from the distance C ₁ to a distance C ₂ ′ so that the upper roll 10 is positioned near the upper surface of the lower roll 12 on the material entering side. 16b near the rear end of the metal plate 16
Is additionally pressurized and further bent. After that, the upper roll 10 is slightly raised from the distance C ₂ ′ to the distance C ₃ . Then, as shown in FIG. 6, the upper rolls 10 and 2
The lower rolls 12 and 14 are simultaneously driven to rotate in the reverse direction, the metal plate 16 is returned in the opposite feed direction by a required set amount L ₂ and then the reverse drive is stopped, whereby the vicinity 16b of the rear end portion of the metal plate 16 is stopped. Is positioned slightly off the lower roll 12 on the material-entry side. And the two lower rolls 12,14
As shown in FIG. 7, is displaced from the reference position S _{0 in the} counter feed direction (−) by a distance S−, and then the upper roll 1
0 is lowered from the previous distance C ₃ to the distance C ₂ . In this manner, the upper roll 10 is once lifted and the pressing force on the metal plate 16 is released, so that the two lower rolls 12, 14 are
6 is displaced from the previously located distance S + to the distance S− on the side opposite to the feed direction through the reference position S ₀ , whereby the vicinity 16b of the rear end portion of the metal plate 16 is shown in FIG. In some cases, it is located shallower on the lower roll 12 on the material-containing side.

In this way, the upper roll 10 descends to the distance C ₂ and the metal plate 16 is pressed between the upper roll 10 and the two lower rolls 12 and 14, as shown in FIG. Reverse driving of the upper roll 10 and the two lower rolls 12 and 14 is started. Thus bending a metal plate 16 processed the required set amount L ₃ only feed while, when the tip vicinity 16a of the metal plate 16 has come to the vicinity of the upper surface of the lower roll 14 of the material outlet side, reversal of these rolls Stop driving. Then, as shown in FIG. 9, the upper roll 10 is lowered to a distance C ₂ ′ in the vicinity of the tip portion 16a of the metal plate 16 located near the upper surface of the lower roll 14 on the material exit side, and the additional roll is additionally added. After pressurizing and bending, the upper roll 10 is raised from the previous distance C ₂ 'to the distance C ₂ .
Next, as shown in FIG. 10, the two lower rolls 12 and 14 of the upper roll 10 are simultaneously driven in the normal direction to return the metal plate 16 by a required set amount L ₄ to thereby cause the metal plate 16 to move.
The vicinity 16a of the leading end of the sheet is positioned slightly away from the lower roll 14 on the material delivery side in the material feeding direction.

Then, as shown in FIG. 11, the upper roll 10
Is lifted from the previous distance C ₂ to the distance C ₃ to release the pressing force on the metal plate 16, and then the two lower rolls 12,
14 from the previous distance S- to the reference position S _{0 in the} material feeding direction
Displace to (+). Then, as shown in FIG. 12, the upper roll 10 is lowered from the previous distance C ₃ to the distance C ₄ , and the metal plate 16 is again pressed between the lower rolls 12 and 14. And the upper roll 10 and the two lower rolls 12,14
By performing the finish winding by alternately repeating the forward rotation driving operation and the reverse rotation driving operation at the same time, finally, a cylindrical body whose cross section is close to a perfect circle can be obtained. The above-mentioned upper roll 10 stepwise ascending and descending motions, the upper roll 10 and the two lower rolls 12 and 14 forward and reverse motions,
The stepwise movement operation in which the metal plate 16 is fed by a predetermined set amount and the displacement timing of the two lower rolls 12, 14 with respect to the reference position S ₀ are shown in the flowchart of FIG.

(Regarding a method for bending a cylindrical body having an elliptical cross section) In this method for bending a cylindrical body having an elliptical cross section, a series of steps shown in FIGS. 13 to 20 are continuously carried out. It is achieved by FIG. 13 shows the first step of bending a cylindrical body having an elliptical cross section, in which the vicinity 16a of the tip of the metal plate 16 is located on the upper surface of the lower roll 14 located on the material delivery side, and The upper roll 10 is located at the reference position C ₀ . The two lower rolls 12 and 14, than the reference position S ₀ at the time of displacement,
It is displaced by the distance S + in the material feeding direction (+). The metal plate 16 is lightly clamped by the upper roll 10 and the two lower rolls 12, 14.

As shown in FIG. 14, the upper roll 10 and the two lower rolls 12 and 14 are simultaneously driven in the normal direction, and
The upper roll 10 starts descending from the reference position C ₀ . As a result, while bending the metal plate 16 in the material feeding direction (+), the bending process is gradually advanced. And the metal plate 16
Is sent by the required amount L ₁ set in advance, the lowering of the upper roll 10 is stopped. At this time, the upper roll 10
Has descended from the previous reference position C ₀ to the distance C ₁ . By continuously driving the upper roll 10 and the two lower rolls 12 and 14 in the normal direction as shown in FIG. 15, the metal plate 16 is fed by a required set amount L ₂ to form an arc. As shown in FIG. 16, while the normal rotation drive of the upper roll 10 and the two lower rolls 12 and 14 is continued, the upper roll 10 is lifted from the previous distance C ₁ to slightly release the rolling force, and The arc formed by feeding the metal plate 16 by the required set amount L ₃ is gradually changed. As shown in FIG. 17, the upper roll 10 is stopped when it rises from the distance C ₁ to a distance C ₂ which is a predetermined processing position, and the normal rotation drive of the upper roll 10 and the two lower rolls 12 and 14 is further continued. To do. As a result, the metal plate 16 is fed by the required set amount L ₄ , and the required arc is formed. At this stage, since the upper roll 10 has risen to the predetermined processing position C ₂ , the curvature of the applied arc is small.

Next, as shown in FIG. 18, the upper roll 10
The normal rotation drive of the two lower rolls 12 and 14 is continued and continued, and the lowering of the upper roll 10 is simultaneously advanced. As a result, the metal plate 16 is fed by the required set amount L ₅ , and the arc formed here gradually changes. That is, at this stage, since the upper roll 10 further starts the processing from the distance C ₂ which is the predetermined processing position, the curvature of the arc given here is changed to a large curvature. As shown in FIG. 19, the upper roll 10 is lowered from the previous distance C ₂ to the next predetermined processing position, the distance C ₁ , and stopped, and the upper roll 10 and the two lower rolls 12, 14 are also stopped.
The normal rotation drive with is continued and the metal plate 16 is set by the set amount L ₆
Send only to form the required arc. Top roll 10 here
Since the metal plate 16 is fed in a state where the metal plate 16 is lowered to the distance C ₁ which is the predetermined machining position, the metal plate 16 is maintained at a predetermined curvature in the range in which the set amount L _{6 is} fed.

As shown in FIG. 20, the forward rotation of the upper roll 10 and the two lower rolls 12 and 14 and the upward movement of the upper roll 10 from the distance C ₂ are simultaneously progressed.
The metal plate 16 is fed by a predetermined set amount L ₇ , and the arc formed here is gradually changed. And the upper roll 10
Is raised from the distance C ₁ to a distance C ₂ which is a predetermined processing position, the raising of the upper roll 10 is stopped. Since the joint between the front end portion 16a and the rear end portion 16b of the metal plate 16 is fairly straight in the illustrated embodiment, no further bending is necessary, but it is necessary to further bend the joint. In some cases, the two lower rolls 12 and 14 may be displaced from the current position S + in the counter-feed direction until they reach the position S-, and bending may be performed again. The above-described stepwise raising and lowering operations of the upper roll 10, the forward and reverse operations of the upper roll 10 and the two lower rolls 12 and 14, the stepwise moving operation in which the metal plate 16 is fed by a predetermined set amount, and Two lower rolls 12,14
The displacement timing with respect to the reference position S ₀ is shown in the flowchart of FIG.

(Regarding Measuring Roll Arranged in Roll Bender) FIGS. 23 and 25 relate to an auxiliary device for preferably carrying out the above-described bending method for a metal plate,
More specifically, the lower roll 12,1 in the roll bender
4 shows a measuring roll 20 which is arranged so as to be able to move up and down. That is, in order to carry out the bending method of the metal plate with the roll bender, as described above, one upper roll 10 and two lower rolls 12, 14 are rotated in the forward direction or the reverse direction at a required timing. The metal plate 16 in the material feeding direction (+) or counter feeding direction
It is important to control (-) to move forward and backward by the required amount.
In order to achieve this control with high accuracy, the metal plate 16 moves forward in the material feeding direction (+) or in the counter feeding direction (-).
It is necessary to know exactly the feed amount to be retracted. Therefore, conventionally, focusing on the point that the upper and lower roll groups always contact the metal plate to give forward and reverse feed when bending the metal plate,
A measure is taken to detect the feed amount by the number of pulses obtained from a pulse generator connected to the upper roll and the lower roll. However, it is difficult to accurately measure the feed amount between the upper and lower rolls and the metal plate because slippage is inevitably generated even though it is a minute amount, which causes an error in bending the metal plate. It is regarded as a problem.

In view of these difficulties, the present application provides an auxiliary device for carrying out a bending method for a metal plate,
It is proposed to dispose the measuring roll 20 so as to be able to move up and down between two lower rolls 12 and 14 in a roll bender. That is, in the roll bender, a required space is formed between the two lower rolls 12 and 14 arranged in parallel with each other, and the measuring roll 20 having a small diameter has a pair of lifting frames 22 and 22 in the space. It is rotatably disposed through the. Since the pair of lifting frames has the same configuration on the left and right, one lifting frame 22
Will be described only. One end of the measuring roll 20 is rotatably supported by a bearing 26 provided on the top of the bracket 24. The bracket 24 has two vertical guide shafts 28,
A base 28 supports the base 30 so that the base 30 can move up and down.
An air cylinder 32 is vertically arranged in the middle of these two guide rods 28, 28 in parallel with them.
The tip of the piston rod 34 that is directed vertically upward of 2 is
It is connected to the lower part of the bracket 24. Therefore,
By pneumatically actuating the air cylinder 32, the measuring roll 20 together with the bracket 24 can freely move up and down between the lowered position shown in FIG. 23 and the raised position shown in FIG. Then, when the measuring roll 20 is lifted to the maximum, the measuring roll 20 can extend slightly above the horizontal pass line PL through which the metal plate 16 passes.

A ring 36 made of hardened steel is externally fitted to the important part of the measuring roll 20. When the measuring roll 20 is lifted to the maximum, the ring 36 comes into contact with the lower surface of the metal plate 16 fed horizontally, and the measuring roll 20
Freely rotate following without slipping. As shown in FIG. 25, the rotation measuring means 38 including a pulse generator is connected to one end of the measuring roll 20.
By the following rotation of the measuring roll 20, the feed amount of the metal plate 16 can be detected by the number of pulses generated. In this way, the measuring roll 20 is brought into direct contact with the metal plate 16 which is the object to be measured, and since the feed amount is measured, there is almost no slippage, and the metal plate 1
The feed amount of 6 can be accurately measured. Further, even if the surface of a metal plate is not flat like a corrugated plate, there is an advantage that the feed amount can be accurately measured.

(Regarding Peripheral Speed Difference Prevention Mechanism between Upper and Lower Rolls) In the roll bender used in this embodiment, a peripheral speed difference occurs between one upper roll 10 and two lower rolls 12 and 14. A mechanism is provided to prevent this. That is, when a metal plate is bent by a roll bender and the thickness of the metal plate is considerably thin, the driving force from the upper roll 10 (in the case of driving the upper roll) is lowered during the bending process. May not be reliably transmitted to. At this time, it is necessary to drive both lower rolls 12 and 14, but it is important that there is no difference in peripheral speed between these upper and lower rolls. However, between the driven upper roll 10 and the two lower rolls 12 and 14 that are also driven differently, the winding diameter of the metal plate 16 changes, and a peripheral speed difference is generated, and the amount thereof also increases. It usually changes. In particular, when the metal plate 16 is made of stainless steel or aluminum, slip scratches are generated on the surface of the metal plate 16 to lower the commercial value. Therefore, a means for preventing the occurrence of the slip scratches by taking a cloth around the upper and lower rolls or a sleeve made of a synthetic resin has been adopted, but this measure is not always sufficient.

In the present embodiment, two mechanisms shown in FIGS. 26 and 27 are selectively employed as means for preventing the occurrence of slip scratches. For example, FIG. 26 shows a hydraulic peripheral speed difference prevention mechanism, in which the upper roll 10 is an electric motor 4
The lower rolls 12 and 14 are driven by a hydraulic motor 44 through a power transmission mechanism 42 including a sprocket and a chain. The torque of the hydraulic motor 44 is set to such a torque that only the lower rolls 12 and 14 rotate, and the hydraulic oil flow control valve 4
By adjusting 6, 46, the speed is set so that the lower rolls 12, 14 rotate slightly earlier than the upper roll 10. A relief valve 52 is provided in a pipe line system from the oil tank 48, which is a supply source of hydraulic oil, to the switching valve 50, branching from the pipeline. When a large load is applied to the lower rolls 12 and 14 during the bending process of the metal plate, by returning the working oil corresponding to the load from the relief valve 52 into the oil tank 48. , The peripheral speeds of the upper and lower roll groups can always be matched.

FIG. 27 shows an electric peripheral speed difference preventing mechanism as another example. The upper roll 10 is driven by an electric motor 54, and the lower rolls 12 and 14 have a power transmission mechanism 56 consisting of a sprocket and a chain. It is driven by another electric motor 58 which is independent. As these motors 54 and 58, for example, an AC servo motor or a vector inverter motor is preferably selected and used. Then, a speed command is given to the control device 60 including a sequencer so that the peripheral speeds of the lower rolls 12 and 14 become the same as the peripheral speed of the upper roll 10, and the torque of the motor 58 is set small.
A torque command for controlling the speed of the lower rolls 12 and 14 is given according to the feed speed of the metal plate 16. The upper roll 1 can be operated by any of these hydraulic and electric mechanisms.
There is no difference in peripheral speed between 0 and the two lower rolls 12 and 14, therefore, the metal plate 1 made of stainless steel or aluminum material.
Slip scratches on the surface of 6 can be prevented in advance. In the illustrated embodiment, the bending process of the cylindrical body having a substantially circular cross section has been described with respect to the step of bending the end portion of the metal plate last. You can also do it. Further, regarding bending of an elliptic cylindrical body having an elliptical cross section, an example has been described in which the notch at the end of bending reaches the curved portion on the major axis side of the ellipse.
However, with respect to this as well, it is possible to carry out the step of bending so that the cut line at the end of bending reaches the curved portion on the minor axis side of the ellipse with a slight modification.

[0025]

As described above, according to the method and apparatus for bending a metal plate of the present invention, a cylindrical body having a substantially perfect cross section or an elliptic cylindrical body having an elliptical cross section is bent. The steps can be smoothly carried out as a series of steps fully automatically without the need for the skilled worker to perform many roll passing operations. Further, since the feed amount of the metal plate which is the object of bending can be accurately detected in the forward and reverse directions, the above-described method of bending the metal plate can be achieved even better.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a series of steps in a method for bending a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 2 is an explanatory view showing a series of steps of a bending method for a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 3 is an explanatory view showing a series of steps of a bending method for a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 4 is an explanatory view showing a series of steps of a bending method for a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 5 is an explanatory view showing a series of steps of the method for bending a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 6 is an explanatory view showing a series of steps of a bending method for a cylindrical body having a perfect circular cross section according to the present invention.

FIG. 7 is an explanatory view showing a series of steps of a bending method for a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 8 is an explanatory view showing a series of steps in a bending method for a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 9 is an explanatory view showing a series of steps in a method for bending a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 10 is an explanatory view showing a series of steps of the method for bending a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 11 is an explanatory view showing a series of steps in a bending method for a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 12 is an explanatory view showing a series of steps in a method for bending a cylindrical body having a perfect circle cross section according to the present invention.

FIG. 13 is an explanatory view showing a series of steps in a method of bending a cylindrical body having an elliptical cross section according to the present invention.

FIG. 14 is an explanatory view showing a series of steps in a bending method for a cylindrical body having an elliptical cross section according to the present invention.

FIG. 15 is an explanatory view showing a series of steps of a bending method for a cylindrical body having an elliptical cross section according to the present invention.

FIG. 16 is an explanatory view showing a series of steps in a bending method for a cylindrical body having an elliptical cross section according to the present invention.

FIG. 17 is an explanatory diagram showing a series of steps in a method for bending a cylindrical body having an elliptical cross section according to the present invention.

FIG. 18 is an explanatory view showing a series of steps of a bending method for a cylindrical body having an elliptical cross section according to the present invention.

FIG. 19 is an explanatory view showing a series of steps in a method of bending a cylindrical body having an elliptical cross section according to the present invention.

FIG. 20 is an explanatory view showing a series of steps in a method for bending a cylindrical body having an elliptical cross section according to the present invention.

FIG. 21 is a timing chart when performing a step of performing a bending method of a cylindrical body having a cross section of a substantially perfect circle.

FIG. 22 is a timing chart diagram when the method of bending a cylindrical body having an elliptical cross section is performed stepwise.

FIG. 23 is a schematic side view of an auxiliary device that preferably carries out the method for bending a metal plate according to the present invention.

FIG. 24 is a schematic side view of an auxiliary device that preferably carries out the method for bending a metal plate according to the present invention.

FIG. 25 is a schematic front view of an auxiliary device that preferably carries out the method for bending a metal plate according to the present invention.

FIG. 26 is a schematic configuration diagram of a first proposal for setting the peripheral speed difference between the upper roll and the lower roll to be the same.

FIG. 27 is a schematic configuration diagram of a second proposal for matching the peripheral speed difference between the upper roll and the lower roll.

FIG. 28 is a schematic configuration diagram of a roll bender according to a conventional technique.

FIG. 29 is a schematic configuration diagram of a roll bender according to a conventional technique.

[Explanation of symbols]

 10 upper roll 12,14 lower roll 16 metal plate 20 measuring roll 38 rotation pulse generating means

Claims (3)

[Claims] 1. An upper roll (10) provided so as to be able to step up and down along a vertical line (S ₀ ) passing through a central axis, and an input side and an output side of a material to be processed with the vertical line (S ₀ ) sandwiched therebetween. And two lower rolls (12, 14) respectively disposed on the and, and the two lower rolls (12, 14) are based on the perpendicular line (S ₀ ) and the material feeding direction (+) or the anti-feeding direction (-). ), And these upper rolls (1
0) and two lower rolls (12, 14) pass a metal plate (16) which is a material to be processed, and in the bending method of giving a cylindrical bend to the metal plate (16), Upper roll (10) located at the reference position (C ₀ ) at the time and two lower rolls (12, 14) displaced in the material feeding direction (+) by the distance (S +) from the reference position (S ₀ ) at the time of displacement. ) And the metal plate (16) is lightly clamped, and the tip of the metal plate (16) is positioned on the upper surface of the lower roll (14) located on the material discharge side. While simultaneously driving the lower rolls (12, 14) in the forward direction and lowering the upper roll (10) from the reference position (C ₀ ), the metal plate (16) is fed in the material feeding direction (+). The bending process proceeds, and the upper roll (10) is stopped at a position lower than the reference position (C ₀ ) by a distance (C ₁ ), and the upper roll (10) and the two lower rolls (12, 14) Forward rotation drive with The metal plate (1
6) to form the required arc, send the metal plate (16) by the required set amount (L ₁ ), the rear end of the metal plate (16) of the lower roll (12) of the material entering side. After reaching near the upper surface, the upper roll (10) and two lower rolls (12,
14) Stop the forward rotation drive with, and if necessary, move the upper roll (10) further from the distance (C ₁ ).
(C ₂ ') and bend it by additionally pressurizing the rear end of the metal plate (16) that is located near the upper surface of the lower roll (12) on the material entry side. After that, the upper roll (10) is raised from the distance (C ₂ ') to the distance (C ₃ ) and the upper roll (10) and the two lower rolls (12, 14) are simultaneously driven in reverse, By returning the metal plate (16) by the required set amount (L ₂ ), the rear end of the metal plate (16) is positioned slightly off the lower roll (12) on the material entering side, Two lower rolls (12,14) from the reference position (S ₀ ) at a distance (S
After displacing only-) in the reverse feed direction (-), the upper roll (1
0) is lowered from the distance (C ₃ ) to the distance (C ₂ ), and the upper roll (10) is in the lowered position of the distance (C ₂ ),
The reverse rotation drive of the upper roll (10) and the two lower rolls (12, 14) is started, and the metal plate (16) is bent and fed by a required set amount (L ₃ ) to bend the metal plate (16). When the tip end of (16) reaches near the upper surface of the lower roll (14) on the material exit side, the reverse drive is stopped, and the tip is positioned near the upper surface of the lower roll (14) on the material exit side. Set the top of the metal plate (16) to the upper roll (10) by a distance (C ₂ ').
After performing additionally pressurized bending by lowering until the distance the upper roll (10) from a distance (C ₂ ') (C ₂₎
By moving the upper roll (10) and the two lower rolls (12, 14) forward at the same time to return the metal plate (16) by a required set amount (L ₄ ). The tip of the metal plate (16) is positioned slightly off from the lower roll (14) on the material exit side in the material feeding direction (+), and the upper roll (10) is moved from the distance (C ₂ ) to the distance (C ₃ ), The two lower rolls (12, 14) are displaced in the material feeding direction (+) from the distance (S-) to the reference position (S ₀ ) and the upper roll (10) is moved by a distance. While lowering from (C ₃ ) to a distance (C ₄ ), the upper roll (10) and two lower rolls (12, 14)
A method for cylindrically bending a metal plate, characterized in that and are simultaneously driven in forward rotation and in reverse rotation to perform finish winding. 2. An upper roll (10) provided so as to be able to step up and down along a vertical line (S ₀ ) passing through the central axis, and an input side and an output side of a material to be processed with the vertical line (S ₀ ) sandwiched therebetween. And two lower rolls (12, 14) respectively disposed on the and, and the two lower rolls (12, 14) are based on the perpendicular line (S ₀ ) and the material feeding direction (+) or the anti-feeding direction (-). ), And these upper rolls (1
0) and the two lower rolls (12, 14), a metal plate (16) as a material to be processed is passed, and a bending process for imparting an elliptic cylindrical bend to the metal plate (16), The upper roll (10) located at the reference position (C ₀ ) when moving up and down, and the two lower rolls (12, 12) displaced in the material feed direction (+) by the distance (S +) from the reference position (S ₀ ) when displaced. 14) and the metal plate (16) is lightly clamped, and the tip of the metal plate (16) is positioned on the upper surface of the lower roll (14) located on the material discharge side. The two lower rolls (12, 14) are driven in the forward direction at the same time, and the upper roll (10) is lowered from the reference position (C ₀ ) to feed the metal plate (16) in the material feeding direction (+). While proceeding with bending while the metal plate (16) is fed by a required set amount (L ₁ ) and the upper roll (10) is lowered by a distance (C ₁ ) from a reference position (C ₀ ), Stop lowering of upper roll (10) With the upper roll
By continuously driving the (10) and the two lower rolls (12, 14) in the forward direction, the metal plate (16) is fed by a required set amount (L ₂ ) to form a required arc, The upper roll (10) and the two lower rolls (12, 14) are continuously driven in the normal direction, and the upper roll (10) is lifted from the distance (C ₁ ) to move the metal plate (16). Required set amount (L
₃ ) gradually changing the arc formed by feeding, the upper roll (10) is stopped when the distance (C ₁ ) rises from the distance (C ₁ ) to a distance (C ₂ ) which is a predetermined processing position, and the upper roll (10) ) And the two lower rolls (12, 14) are continuously driven to rotate the metal plate (16) to a required set amount (L ₄ ).
To form a desired circular arc, and the normal rotation drive of the upper roll (10) and the two lower rolls (12, 14) and the lowering of the upper roll (10) are simultaneously progressed. By gradually changing the arc formed by feeding the metal plate (16) by the required set amount (L ₅ ), the upper roll (10) moves from the distance (C ₂ ) to the distance (C ₁ ) which is the predetermined processing position. Lower and stop, and the upper roll
By continuing the normal rotation drive of (10) and the two lower rolls (12, 14), the metal plate (16) is sent by a required set amount (L ₆ ) to form a required arc, The forward rotation of the upper roll (10) and the two lower rolls (12, 14) and the upward movement of the upper roll (10) are simultaneously advanced to move the metal plate (16) to a desired set amount ( L ₇ ) gradually changing the arc formed by feeding, the upper roll (10) of the upper roll (10), when the upper roll (10) rises from the distance (C ₁ ) to a distance (C ₂ ) which is a predetermined processing position. A method for bending an elliptic cylinder of a metal plate, characterized by stopping the ascent. 3. An upper roll (10) and two lower rolls arranged on the inlet side and the outlet side of the material to be processed with a perpendicular line (S ₀ ) passing through the center line of the upper roll (10) interposed therebetween. (12, 14) and a metal plate (16) as a material to be processed is passed between the upper roll (10) and the two lower rolls (12, 14), and the metal plate (16)
In a bending apparatus for imparting a required bending to, in a space formed between the two lower rolls (12, 14),
Small diameter measuring roll (20) parallel to both rolls (12, 14)
The measuring roll (20) is provided with a rotation pulse generating means (38) at one end thereof, and is slightly raised from the pass line (PL) of the metal plate (16) at the time of rising. A pulse that extends upward and can contact the metal plate (16) and that corresponds to the feed amount in the forward or backward direction of the metal plate (16) is generated from the rotation pulse generation means (38). A bending apparatus characterized by being configured to.