Bending system and oil application method

Abstract

To provide a small-sized oil application device which can be arranged between a die and a punch.SOLUTION: An oil application device (2) includes: a base (21) mounted on a die holder (811); a body part (22) which is liftably supported between a first height position and a second height position higher than the first height position by the base (21); a lifting part (25) for lifting the body part (22) between the first height position and the second height position; a storage part (23) which is provided inside the body part (22), and stores lubricant oil (LQ); and a roller (261) which is rotated around a rotation axis (CL2) perpendicular to an extension direction of the die holder (811), whose lower part is immersed in the lubricant oil (LQ) stored in the storage part (23) and upper part projects to the upper side of the body part (22).SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention ,song Processing system and an oil application method. [Background technology]

[0002] Patent Document 1 describes an oil application device that applies lubricating oil to a workpiece to be pressed.

[0003] In the sheet metal bending process of press working, a sheet metal workpiece is inserted between a die having a V-groove and a punch having a protrusion corresponding to the V-groove of the die, for example by a robot hand device, and the die and punch are then brought close together, and the workpiece is sandwiched between the two dies and processed into the desired bent shape. In this processing, the so-called shoulders on both the front and back sides of the V-groove of the die are areas where the underside of the workpiece slides as it is pushed into the V-groove by the punch entering the V-groove, and the sliding property between the shoulders and the workpiece affects the accuracy of the bending processing. Therefore, if necessary, lubricant is applied to the lower surface of the workpiece that faces the die before bending. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-280098 A Summary of the Invention [Problem to be solved by the invention]

[0005] In terms of shortening the processing time and reducing the amount of lubricant used, it is desirable to automatically apply lubricant to a workpiece during bending in a limited linear range corresponding to the shoulder of the die while the workpiece held by a robot hand device is inserted between the die and the punch. However, such application is difficult with a large oil application device such as that described in Patent Document 1. In other words, it is desirable for the oil application device to be small enough to be placed at least between the die and the punch. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention is the following: 、2 ). 1) The present invention Bending System One aspect of the present invention is A robot hand device that holds a sheet metal workpiece in a desired position, a lower table, a die holder attached to an upper end of the lower table, and a die attached to the die holder, The die holder includes a base attached to the die holder, a main body supported by the base so as to be movable between a first height position and a second height position higher than the first height position, a lifting unit that lifts and lowers the main body between the first height position and the second height position, a storage unit that is provided inside the main body and stores a lubricating oil, and a roller that rotates around a rotation axis perpendicular to an extension direction of the die holder, a lower part of which is immersed in the lubricating oil stored in the storage unit and an upper part of which protrudes above the main body. At the first height position, at least the upper end of the roller is located below the upper surface of the die, and at the second height position, the upper end of the roller is located above the upper surface of the die. Oil application device and a control unit that controls the operation of the robot hand device and the lifting unit, and the control unit controls the following steps: a first oil application step in which the main body of the oil application device is placed at a second height position, and the robot hand device translates the workpiece so that the roller rolls on the underside, and transfers the lubricating oil to a first application area on the underside that is parallel to the bending line of the next bending process and separated by half the width of the V-groove of the die; and a second oil application step in which, after the first oil application step, the workpiece is translated again so that the roller rolls on the underside, and transfers the lubricating oil to a second application area on the underside that is symmetrical to the first application area across the bending line. . This makes it possible to make the oil application device small enough to be placed between the die and the punch, and a robotic hand device can be used to automatically apply lubricating oil to the areas that come into contact with the first and second shoulders of the die while the workpiece is inserted between the die and the punch. 2) One embodiment of the bending method of the present invention includes a robot hand device that holds a sheet metal workpiece in a desired position. a lower table, a die holder attached to an upper end of the lower table, and a die attached to the die holder; a base attached to the die holder; a main body supported by the base so as to be able to rise and fall between a first height position and a second height position higher than the first height position; a lifting unit that lifts and lowers the main body between the first height position and the second height position; a storage unit that is provided inside the main body and stores lubricating oil; and a roller that rotates around a rotation axis perpendicular to an extension direction of the die holder, a lower portion of which is immersed in the lubricating oil stored in the storage unit and an upper portion of which protrudes above the main body. An oil application device; At the first height position, at least an upper end of the roller is located below an upper surface of the die, and at the second height position, an upper end of the roller is located above an upper surface of the die. Bending machine and ,ofThe oil application method includes a first oil application step in which the main body of the oil application device is set to a second height position, and the workpiece is translated by the robot hand device so that the roller rolls on the underside, and the lubricating oil is transferred to a first application area on the underside that is parallel to the bending line of the next bending process and separated by half the width of the V-groove portion of the die, and after the first oil application step, the workpiece is again translated to the underside so that the roller rolls on the underside, and the lubricating oil is transferred to a second application area on the underside that is symmetrical to the first application area across the bending line. This makes it possible to make the oil application device small enough to be placed between the die and the punch, and a robotic hand device can be used to automatically apply lubricating oil to the areas that come into contact with the first and second shoulders of the die while the workpiece is inserted between the die and the punch. Effect of the Invention

[0007] One aspect of the present invention is that it is compact and can be placed between the die and the punch. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an oil application device 2, which is an example of an oil application device and a bending machine according to an embodiment of the present invention, and a bending machine 92 equipped with the oil application device 2. As shown in FIG. [Diagram 2] FIG. 2 is a front view of the oil application device 2. As shown in FIG. [Diagram 3] FIG. 3 is a top view of the oil application device 2. As shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line S4-S4 in FIG. 3 with the oil application device 2 in a raised state. [Diagram 5] FIG. 5 is a cross-sectional view taken along the line S4-S4 in FIG. 3 with the oil application device 2 in the lowered state. [Figure 6] FIG. 6 shows a die cleaning device 1 which can be equipped with a bending machine 92, where FIG. 6(a) is a front view and FIG. 6(b) is a side view. [Figure 7]FIG. 7 is a top view of the oil application device 2 and the die 87 installed in the bending machine 92. As shown in FIG. [Figure 8] FIG. 8 is a front view showing the height relationship between the die 87 and the mold cleaning device 1 when the oil application device 2 is in a lowered state. [Figure 9] FIG. 9 is a front view showing the height relationship between the die 87 and the workpiece W when the oil application device 2 is in a raised state. [Figure 10] FIG. 10 is a side view showing the positional relationship in the front-rear direction between the oil application device 2 and the channel brush portion 14 of the die cleaning device 1 with respect to the die 87. As shown in FIG. [Figure 11] FIG. 11 is a first diagram for explaining a method for applying oil to a workpiece W using the oil application device 2. As shown in FIG. [Figure 12] FIG. 12 is a second diagram for explaining the method of applying oil to the workpiece W using the oil application device 2. As shown in FIG. [Figure 13] FIG. 13 is a third diagram for explaining the method of applying oil to the workpiece W using the oil application device 2. As shown in FIG. [Figure 14] FIG. 14 is a fourth diagram for explaining the method of applying oil to the workpiece W using the oil application device 2. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] FIG. 1 is a perspective view showing an oil application device 2, which is an example of an oil application device and a bending machine according to an embodiment of the present invention, and a bending machine 92 equipped with the oil application device 2. As shown in FIG. For ease of explanation, the up, down, left, right, front and rear directions are defined as directions indicated by arrows in FIG.

[0010] As shown in FIG. 1, the bending machine 92 has a lower table 81, an upper table 82 arranged above the lower table 81, and a control unit 83. The control unit 83 includes a central processing unit (CPU) 831, a storage unit 832, and an input unit .

[0011] One of the upper table 82 and the lower table 81 is raised and lowered by a lifting and lowering drive unit (not shown) so as to move away from and toward the other in the vertical direction (see arrow DR1 in FIG. 1). The operation of the lifting and lowering drive unit is controlled by a control unit 83.

[0012] A die holder 811 is attached to the upper end of the lower table 81. A die 87, which is a lower bending tool, is detachably attached to the die holder 811. On the outside of both left and right ends of the die 87, a box-shaped dust box 814 and a dust box 813, each of which is open at the top, are provided. A punch holder 821 is attached to the lower end of the upper table 82. A punch 822, which is an upper bending die that is paired with the die 87, is detachably attached to the punch holder 821.

[0013] The die 87 has a V-shaped groove 87V extending in the left-right direction. The extending direction of the V-shaped groove 87V is the longitudinal direction of the die 87. The front side of the V-groove 87V on the upper surface of the die 87 is a first shoulder 87a, and the rear side is a second shoulder 87b. The bottom of the V-groove 87V is a groove bottom 87e.

[0014] A robot hand device 7 is disposed in front of the bending machine 92. The robot hand device 7 holds the sheet metal workpiece W in any posture by suction or the like under the control of the control unit 83. For example, in bending, the robot hand device 7 holds the workpiece W in a horizontal posture in a predetermined direction and inserts it between the punch 822 and the die 87 (see arrow DR12).

[0015] The bending machine 92 bends the workpiece W inserted between the die 87 and the punch 822 by the robot hand device 7 by bringing the upper table 82 and the lower table 81 closer together relative to one another to produce a bent shape that corresponds to the combination of the die 87 and the punch 822.

[0016] As shown in Fig. 1, a guide member 85 is attached to the upper part of the front surface of the lower table 81. The guide member 85 is a rail-shaped member extending left and right. Some bending machines 92 are equipped with a die cleaning device 1. The die cleaning device 1 is supported by the guide member 85, and can move left and right on the guide member 85 via a power transmission member such as a belt by the operation of an actuator 86 (see arrow DR2).

[0017] An oil application device 2 is attached to the left or right of the die 87 in the die holder 811. In Fig. 1, the oil application device 2 is attached to the left of the die 87. The upper end of a disk-shaped roller 261 protrudes upward and is exposed from the upper surface of the oil application device 2.

[0018] The configuration of the oil application device 2 will be described in detail with reference to FIGS. Fig. 2 is a front view of the oil application device 2. Fig. 3 is a top view of the oil application device 2. Fig. 4 is a cross-sectional view at the S4-S4 position in Fig. 3 when the oil application device 2 is in an elevated state. Fig. 5 is a cross-sectional view at the S4-S4 position in Fig. 3 when the oil application device 2 is in a lowered state.

[0019] The oil application device 2 has a base 21 and a main body portion 22 . The base 21 has a rectangular plate shape that is long in the left-right direction, and is a member that is attached to the die holder 811. Near the right end and the left end of the upper surface of the base 21, a guide pillar 241 and a guide pillar 242 are respectively provided so as to extend straight up. An air cylinder 251 is attached to a position toward the front in the center in the left-right direction of the base 21. The air cylinder 251 is in an upright position, and a rod 252 moves in and out so as to protrude upward.

[0020] A first air hose 254 and a second air hose 255 are connected to the air cylinder 251, and depending on the supply state of high-pressure air supplied to each of them, the rod 252 moves up and down between the extended position shown in FIG. 4 and the retracted position shown in FIG. 5. The operation of the air cylinder 251 is controlled by the control unit 83 . The upper end of the rod 252 is connected to the upper wall portion 22 a of the main body portion 22 by a connecting portion 253 .

[0021] The main body 22 has a box shape that is long in the left-right direction. The bottom wall portion 22b has linear guides 243 and 244 at positions corresponding to a pair of guide posts 241 and 242 erected on the base 21, respectively. The guide posts 241 and 242 are smoothly inserted into the linear guides 243 and 244 , thereby allowing the main body 22 to move up and down relative to the base 21 . The linear guide 243 and the guide post 241 form the lift guide section 24A, and the linear guide 244 and the guide post 242 form the lift guide section 24B.

[0022] An opening 22b1 is formed in the center of the bottom wall 22b of the main body 22, through which the lifting unit 25 consisting of a rod 252 and an air cylinder 251 can pass. Inside the main body 22, there is disposed a storage unit 23 that is U-shaped in top view and has a shape and position that does not interfere with the guide posts 241, 242 that are inserted into the linear guides 243, 244, and the lift unit 25. The storage unit 23 is a container that can store the liquid LQ therein. An opening 23a that opens to the outside together with the upper wall portion 22a is formed in the upper right portion of the storage portion 23. The opening shape of the opening 23a is a rectangle that is long in the left-right direction. The storage portion 23 is sealed except for the opening 23a.

[0023] At the right part of the accommodation part 23, a shaft part 262 having a rotation axis CL2 extending in the front-rear direction perpendicular to the extending direction of the die holder 811, and a disk-shaped roller 261 integrated with the shaft part 262 are arranged. The opening 23a and the roller 261 constitute the application section 26. The upper end of the roller 261 protrudes upward from the opening 23a and is exposed to the outside. The lower end of the roller 261 is located close to the bottom 23b of the storage section 23. The liquid LQ contained in the container 23 is, for example, a lubricating oil for bending, and at least the circumferential surface of the roller 261 is formed of a material having high lipophilicity or has been modified to have high lipophilicity. Hereinafter, the liquid LQ will be described as lubricating oil LQ.

[0024] The roller 261 rotates freely due to an external force. When the peripheral surface portion of the roller 261 immersed in the lubricating oil LQ is removed from the lubricating oil LQ by rotation and rotates to an exposed position at the top, the lubricating oil LQ adheres to the exposed peripheral surface.

[0025] Window portions 27A and 27B are provided on the left side of the front surface and the left side of the top surface of main body 22, respectively. Window portion 27A and window portion 27B have transparent windows 271 and 273, and window frames 272 and 274, respectively. Window frames 272 and 274 seal and attach windows 271 and 273, respectively, to the main body. Through the windows 271, 273, an operator can visually grasp the internal state of the storage portion 23 and the amount of lubricant LQ, if any, stored therein.

[0026] The main body 22, together with the storage part 23, is raised and lowered between a lowered position which is a first height position shown in Fig. 5 and an elevated position which is a second height position shown in Fig. 4 by the operation of the air cylinder 251, and is maintained at each position. That is, the oil application device 2 transitions between an elevated state in which the main body 22 is in the elevated position, and a lowered state in which the main body 22 is in the lowered position.

[0027] Next, a schematic configuration of a die cleaning device 1 that may be used together with an oil application device 2 in a bending machine 92 will be described with reference to Fig. 1 and Fig. 6. Fig. 6 shows the die cleaning device 1 provided in the bending machine 92, with Fig. 6(a) being a front view and Fig. 6(b) being a side view.

[0028] As shown in FIG. 1, the die cleaning device 1 moves in the left-right direction on a guide member 85 along a die holder 811 under the control of a control unit 83. As shown in FIG. 6(a), this left-right movement causes the cleaning main body 11 to move left-right above the die 87 (see arrow DR3). The cleaning main body 11 has a drive axis extending in the front-to-rear direction, and has a first brush part 12 and a second brush part 13 that are spaced apart parallel to each other in the left-to-right direction and are offset from each other in the front-to-rear direction, as well as a channel brush part 14 that is arranged at the right end.

[0029] The first brush unit 12 has a first motor 121 and a first brush 123 rotated by the first motor 121. The second brush unit 13 has a second motor 131 and a second brush 133 rotated by the second motor 131. The first brush 123 and the second brush 133 are formed to have the same diameter. The first brush 123 and the second brush 133 come into contact with the first shoulder 87a and the second shoulder 87b of the die 87, respectively, and move left or right while rotating clockwise or counterclockwise to remove black scale or plating particles adhering to the first shoulder 87a and the second shoulder 87b.

[0030] The channel brush portion 14 has a brush holder 142 and a channel brush 141 extending downward from the lower end of the brush holder 142, and is disposed at the center of the V-groove portion 87V of the die 87 in the width direction (front-rear direction). The tip of the channel brush 141 contacts the groove bottom 87e of the die 87 and sweeps the groove bottom 87e as the cleaning body 11 moves left and right, sweeping out and removing black scale or plating chips that have accumulated at the groove bottom 87e.

[0031] The difference in height between the die cleaning device 1, the oil application device 2, and the bending machine 92 to which the die 87 are attached will be described with reference to FIGS. Fig. 7 is a top view of the oil application device 2 and the die 87 installed in the bending machine 92. Fig. 8 is a front view showing the height relationship between the die 87 and the die cleaning device 1 when the oil application device 2 is in a lowered state. Fig. 9 is a front view showing the height relationship between the die 87 and the workpiece W when the oil application device 2 is in a raised state. Fig. 10 is a side view showing the positional relationship in the front-rear direction between the oil application device 2 and the channel brush unit 14 of the die cleaning device 1 with respect to the die 87.

[0032] 7, the oil application device 2 is attached to the left side of the die 87 in the die holder 811. The center position in the width direction of the roller 261 rotating about the rotation axis CL2 in the oil application device 2 is shifted forward by a distance D2 from the center line CL1 in the width direction (front-rear direction) of the die 87. The distances from the center line CL1 to the center positions in the width direction of the first shoulder portion 87a and the second shoulder portion 87b of the die 87 are equal to a distance D1.

[0033] As shown in Figure 8, when the oil application device 2 is in the lowered position, the height position LNR of the top of the roller 261, which is at the highest position in the oil application device, is lower than the height position LNL of the groove bottom 87e of the die 87. Therefore, if the oil application device 2 is kept in a lowered state, the main body of the die cleaning device 1 can pass above the oil application device 2 without interfering with it, thereby cleaning the die 87.

[0034] As shown in FIG. 9, when the oil application device 2 is in the raised position, the height position LNR of the top of the roller 261 is higher than the height position LNH of the first shoulder 87a and the second shoulder 87b, which are at the highest positions of the die 87. Therefore, even if the oil application device 2 is in the raised position and the workpiece W is placed in a horizontal position by the robot hand device 7 so that its lower surface Wa comes into contact with the roller 261, the workpiece W will not interfere with the die 87 in the height direction. Therefore, the robot hand device 7 can move the workpiece W in the left-right direction with the roller 261 in contact with its lower surface Wa to a position where it hangs above the die 87 or pass above the die 87.

[0035] 10, the roller 261 is positioned forwardly of the center line CL1. Therefore, the height position LNR of the top of the roller 261 does not necessarily have to be lower than the height position LNL of the groove bottom 87e of the die 87. It is sufficient that at least the height position LNS of the upper surface of the main body 22 of the oil application device 2 is lower than the height position LNL.

[0036] According to the above-mentioned oil application device 2, the main body 22 has a storage section 23 that stores lubricating oil LQ, and a roller 261 that can transfer the lubricating oil LQ to the underside Wa of the workpiece W by rotating with its lower part immersed in the lubricating oil LQ stored in the storage section 23 and its upper part protruding upward from the main body 22. This allows the length of the main body 22 in the height direction to be reduced, making it possible to install the main body 22 between the die 87 and the punch 822.

[0037] In the oil application device 2, the main body 22 is supported so as to be movable up and down by the base 21 attached to the die holder 811. Therefore, the main body 22 can be raised so that the height position LNR of the upper end of the roller 261 is positioned above the height position LNL of the upper end of the die 87 only during the operation of applying oil. As a result, the workpiece W does not interfere with the die 87 during the oil application operation, and other than the oil application operation, even if the bending machine 92 has a die cleaning device 1, it does not interfere with the cleaning operation of the die cleaning device 1, making it compact and highly convenient.

[0038] Next, a specific example of a method for applying lubricating oil LQ to a workpiece W will be described with reference to Figs. 11 to 14. Fig. 11 is a first diagram for explaining the method for applying oil to a workpiece W using the oil application device 2. Fig. 12 is a second diagram for explaining the method for applying oil to a workpiece W using the oil application device 2. Fig. 13 is a third diagram for explaining the method for applying oil to a workpiece W using the oil application device 2. Fig. 14 is a fourth diagram for explaining the method for applying oil to a workpiece W using the oil application device 2.

[0039] As shown in FIG. 11, the robot hand device 7 has a slide base 71, a base portion 72, an arm 73, a holder portion 74, and a rail 75. The rails 75 are laid so as to extend in the left-right direction on the installation surface on which the bending machine 92 is installed. The slide base 71 is supported by a rail 75 and is movable in the left-right direction on the rail 75. The base part 72 is supported by the slide base 71 and is movable in the front-rear direction. The arm 73 is a hand with multiple degrees of freedom, and has a holding part 74 attached to its tip. The holding portion 74 holds the sheet metal workpiece W in a desired position by magnetic or pneumatic suction, or by clamping.

[0040] As shown in FIG. 11, the bending position of the workpiece W in the bending process using the die 87 is indicated by a bending line Wb. The control unit 83 operates the air cylinder 251 to raise the oil application device 2 to a raised state. Next, the control unit 83 operates the robot hand device 7 to suck and hold the workpiece W by the holding unit 74. Next, the workpiece W is positioned so that it is not caught by the oil application device 2, and the bending line Wb is shifted backward from the center line CL1 of the die 87 by a distance D4 and is parallel to it. This position is called the standby position. Distance D4 is a value obtained by subtracting distance D2 from distance D1. In addition, in the height direction, the lower surface Wa of the workpiece W is set to be at the same height position LNR as or slightly below the height position LNR of the roller 261 in the raised state, so that the roller 261 and the lower surface Wa always come into contact with each other.

[0041] As shown in FIG. 12, the control unit 83 moves the base 72 of the robot hand device 7 rightward along the rail 75 as a first oil application step. Accordingly, the lower surface of the workpiece W attracted and held by the holder 74 comes into contact with the circumferential surface of the roller 261, causing the roller 261 to roll and move in parallel to the right (see arrow DR4). Lubricating oil LQ is applied to the circumferential surface of the rotating roller 261. Therefore, this lubricating oil LQ is transferred to the lower surface Wa of the workpiece W, forming a first application area AR1 where the lubricating oil LQ is applied. The first application area AR1 is an area that includes a portion that comes into contact with the first shoulder portion 87a of the die 87 during the bending process, and is a narrow, straight area that is separated in parallel from the bending line Wb by half the width of the V-groove portion 87V. The workpiece W that has passed the roller 261 is positioned above the die 87, but does not interfere with the die 87 as described above.

[0042] Next, as shown in FIG. 13, the control unit 83 causes the robot hand device 7 to horizontally move the workpiece W forward to a predetermined position (see arrow DR5). The predetermined position is a position where the bending line Wb of the workpiece W is a distance D3 from the center line CL1 of the die 87. The distance D3 is the sum of the distance D2 and the distance D1. This allows the lubricant LQ to be applied to an area symmetrical to the first application area AR1 across the bending line Wb.

[0043] Next, as shown in FIG. 14, the control unit 83 causes the robot hand device 7 to translate the workpiece W leftward and return it to the standby position described in FIG. 11 (see arrow DR6) as a second oil application step. As a result, a second application area AR2 in which the lubricating oil LQ is transferred and applied is formed on the underside Wa of the workpiece W. The second application area AR2 is located symmetrically to the first application area AR1 with respect to the bending line Wb on the underside Wa. The second application area AR2 is an area that includes a portion that comes into contact with the second shoulder portion 87b of the die 87 during the bending process. As described above, the central processing unit 931 checks the distances D3 and D4 each time an oil application operation is performed based on the distance D2 obtained from the information of the oil application device 2 stored in the memory unit 832 and the distance D1 obtained from the information of the die to be used in the next bending process, and resets them if necessary.

[0044] According to the above-described method of applying lubricating oil, by using a small oil application device 2 that can be arranged between the die 87 and the punch 822, the application of lubricating oil LQ to the portions of the workpiece W that come into contact with the first shoulder 87a and the second shoulder 87b of the die 87 can be automatically performed by the operation of the robot hand device 7. Furthermore, while the workpiece W is still inserted between the die 87 and the punch 822, the lubricating oil LQ can be accurately applied to a limited narrow and linear range that corresponds to the first shoulder 87a and the second shoulder 87b of the die 87.

[0045] The lubricant LQ is applied to the workpiece W not by spraying, but by transfer, in which the lubricant LQ comes into contact with the roller 261 and is transferred from the circumferential surface of the roller 261 to the underside Wa of the workpiece W. This ensures that the minimum necessary amount of the lubricant LQ is applied to the underside Wa, and since substantially no lubricant LQ disperses, consumption of the lubricant LQ can be kept to a minimum.

[0046] The embodiment of the present invention is not limited to the above-mentioned configuration, and may be modified without departing from the spirit and scope of the present invention.

[0047] The order in which the first coating region AR1 and the second coating region AR2 are formed is not limited. The operation of each component in the above-mentioned oil application method may be executed by the control unit 83 based on an oil application program previously stored in the memory unit 832, or the operator may input the operation via the input unit 84 and execute the operation. [Explanation of symbols]

[0048] 1 Mold cleaning device 11 Cleaning main body 12 First brush section 121 First Motor 123 First Brush 13 Second brush section 131 Second Motor 133 2nd Brush 14 Channel brush section 141 Channel Brush 142 Brush holder 2 Oil application device 21 Base 22 Main body 22a Upper wall part 22b1 opening 23 Storage unit 23a opening 24A, 24B Lifting guide section 241,242 Guide pillar 243,244 Linear guide 25 Lifting section 251 Air Cylinder 252 Rod 253 Connecting part 254 No. 1 Air Hose 255 No. 2 Air Hose 26 Application section 261 Lola 262 Shaft 27A, 27B Window section 271,273 Windows 272,274 Window frame 7 Robot Hand Device 71 Slide Base 72 Base 73 Arm 74 Holding part 75 Rail 81 Lower Table 811 Die holder 813,814 Dust box 82 Upper Table 821 Punch holder 822 Punch (Upper bending die) 83 Control Unit 831 Central Processing Unit (CPU) 832 Storage section 84 Input section 85 Guide member 86 Actuator 87 Die (Lower bending die) 87a 1st shoulder 87b 2nd shoulder 87e groove bottom 87V V groove 92 Bending machine AR1 First coating area AR2 Second coating area CL1 center line CL2 Rotation axis D1,D2,D3,D4 Distance LNL, LNH, LNR, LNS Height position LQ Lubricating oil (liquid) Double work Wa Bottom Wb Fold line

Claims

1. A robot hand device that holds a sheet metal workpiece in a desired position; a lower table, a die holder attached to an upper end of the lower table, and a die attached to the die holder; an oil application device including: a base attached to the die holder; a main body supported by the base so as to be able to rise and fall between a first height position and a second height position higher than the first height position; a lifting unit that lifts and lowers the main body between the first height position and the second height position; a storage unit that is provided inside the main body and stores lubricating oil; and a roller that rotates around a rotation axis perpendicular to the extension direction of the die holder, a lower part of which is immersed in the lubricating oil stored in the storage unit and an upper part of which protrudes above the main body, wherein at the first height position, at least an upper end of the roller is located below an upper surface of the die, and at the second height position, an upper end of the roller is located above an upper surface of the die; A control unit that controls the operation of the robot hand device and the lifting unit; A bending machine having Equipped with The control unit is The body of the oil application device is placed at a second height position; a first oil application step in which the workpiece is translated by the robot hand device so that the roller rolls on the lower surface, and the lubricating oil is applied to a first application area on the lower surface, the first application area being separated by half the width of the V-groove portion of the die in parallel to a bending line of a next bending process; After the first oil application step, the work is again translated so that the roller rolls on the lower surface, and the lubricating oil is transferred to a second application area on the lower surface that is symmetrical to the first application area across the folding line. The bending system includes:

2. a die cleaning device having a channel brush that moves along the die holder and sweeps the bottom of the V-groove of the die; The bending processing system of claim 1, wherein, at the first height position, the upper end of the roller is located below the height position of the bottom of the V-groove portion, or the main body portion is located below the height position of the bottom, and the roller is offset in the width direction of the die so as not to interfere with the channel brush.

3. A robot hand device that holds a sheet metal workpiece in a desired position; a lower table, a die holder attached to an upper end of the lower table, and a die attached to the die holder; and an oil application device including: a base attached to the die holder; a main body supported by the base so as to be movable between a first height position and a second height position higher than the first height position; a lifting unit that lifts and lowers the main body between the first height position and the second height position; a storage unit that is provided inside the main body and stores lubricating oil; and a roller that rotates around a rotation axis perpendicular to the extension direction of the die holder, a lower part of which is immersed in the lubricating oil stored in the storage unit and an upper part of which protrudes above the main body, a bending machine in which, at the first height position, at least an upper end of the roller is located below an upper surface of the die, and, at the second height position, an upper end of the roller is located above an upper surface of the die; An oil application method for applying the lubricating oil to the workpiece using The body of the oil application device is placed at a second height position; a first oil application step in which the workpiece is translated by the robot hand device so that the roller rolls on the lower surface, and the lubricating oil is applied to a first application area on the lower surface, the first application area being separated by half the width of the V-groove portion of the die in parallel to a bending line of a next bending process; and a second oil application step of, after the first oil application step, again translating the workpiece so that the roller rolls on the underside, thereby transferring the lubricating oil to a second application area on the underside that is symmetrical to the first application area across the bend line.

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