The present invention relates to a bonding device and a bonding method for bonding a pair of workpieces having a two-dimensional planar shape in which a protruding curved surface and a recessed curved surface are continuous.
As for a bonding device for obtaining a bonded body by bonding a pair of workpieces, the present applicant has previously proposed a bonding device of Patent Literature 1. The bonding device of Patent Literature 1 includes an upper suction base that sucks and holds a first workpiece, and a group of lower suction bases that suck and hold a second workpiece. The lower suction base is provided with a bonding roller that bonds the second workpiece to the first workpiece, an elevating structure to moves the bonding roller up and down, a roller moving structure that laterally moves the bonding roller from a bonding start end toward a bonding stop end, and the like. At the time of bonding both the workpieces, the second workpiece is bonded to the first workpiece while retracting the lower suction bases from a lateral movement region of the bonding roller one after another in a state where the bonding start end of the second workpiece is pressed and held by the bonding roller.
Patent Literature 1: JP 2015-39862 A
According to the bonding device of Patent Literature 1, since the pair of workpieces are bonded in a state of being sucked and held in, for example, a protruding curved surface shape, both the workpieces can be appropriately bonded. However, the bonding can be performed with high accuracy only when the bonding surface of each workpiece is a simple protruding curved surface or a concave curved surface, and when the bonding surface is a concavo-convex curved surface in which the protruding curved surface and the concave curved surface are continuous, the bonding accuracy is limited. This is because, when a workpiece having self-shape retainability such as a glass substrate, and a workpiece having no self-shape retainability such as a functional sheet are bonded to each other, the latter (functional sheet) cannot be accurately retainable in a concavo-convex curved surface shape, and as a result, it is difficult to correctly position both the workpieces. More specifically, in the bonding device of Patent Literature 1, even if the functional sheet is placed and positioned on a suction screen in a state where the group of lower suction bases are lowered, when the functional sheet is sucked and held by raising the lower suction bases to a suction position, suction timings of the individual lower suction bases are shifted, and it is inevitable that the functional sheet is shifted. Therefore, in the bonding device of Patent Literature 1, when the bonding surface is a concavo-convex curved surface in which a protruding curved surface and a concave curved surface are continuous, the bonding accuracy of both the workpieces is limited, and there is room for improvement in this point.
An object of the present invention is to provide a bonding device and a bonding method capable of precisely positioning both workpieces and bonding both workpieces more accurately even when a bonding surface of each workpiece includes a concavo-convex curved surface in which a protruding curved surface and a recessed curved surface are continuous.
A bonding device according to the present invention includes an upper suction board 1 including an upper suction base 4 that sucks and holds a first workpiece W1, and a lower suction board 2 including a lower suction base 6 that sucks and holds a second workpiece W2. In the upper suction base 4, a suction base 14 for sucking and holding the first workpiece W1 molded, in advance, including a concavo-convex curved shape in which a protruding curved surface and a recessed curved surface are continuous is formed. The lower suction base 6 is provided with a fixed suction base 16 having a frame structure fixed to a base 5, a movable suction base 17 having a frame structure disposed around the fixed suction base 16, and a suction screen 8 covering an upper opening surface of the movable suction base 17. The movable suction base 17 is configured to be vertically movable between a workpiece supporting position where its upper opening surface is located above an upper opening surface of the fixed suction base 16 and the second workpiece W2 on the suction screen 8 is sucked and held in a flat posture, and a workpiece transfer position where the upper opening surface is lowered below the upper opening surface of the fixed suction base 16 and the suction screen 8 is supported by the upper opening surface of the fixed suction base 16. A concavo-convex curved part 18 corresponding to the concavo-convex curved shape of the first workpiece W1 is formed in a peripheral frame part of the fixed suction base 16, and in a state where the movable suction base 17 is lowered to the workpiece transfer position, the second workpiece W2 supported in a flat posture by the suction screen 8 is sucked and held in a concavo-convex curved shape via the suction screen 8 deformed exactly along the concavo-convex curved part 18. In a state where the first workpiece W1 sucked and held by the upper suction base 4 and the second workpiece W2 sucked and held by the lower suction base 6 face each other vertically, the second workpiece W2 is pressed against the first workpiece W1 by a bonding roller 7 provided inside the fixed suction base 16, and it is characterized in that, in this state, the bonding roller 7 is moved from a bonding start end to a bonding stop end while being moved up and down along the concavo-convex curved shape of the first workpiece W1, whereby the first workpiece W1 and the second workpiece W2 are bonded.
The fixed suction base 16 and the movable suction base 17 are each formed in a square frame shape. The concavo-convex curved part 18 is formed on each side part of one of facing side parts, out of four peripheral side parts constituting the fixed suction base 16, and a stretching structure that stretches and holds the suction screen 8 is disposed outside the facing side parts. The stretching structure includes a first stretching structure that stretches the suction screen 8 in a direction parallel to a bonding movement direction of the bonding roller 7, and a second stretching structure that stretches the suction screen 8 in a direction orthogonal to the bonding movement direction of the bonding roller 7. The second stretching structure includes a slide stand 23 that is guided and supported by the base 5 so as to be able to slide back and forth, a slider 24 that is guided and supported by the slide stand 23 so as to be able to slide up and down, an elevating cylinder 25 that performs an elevating operation of the slider 24 to stretch the suction screen 8, and a connecting structure 26 that is mounted on the slider 24 and fixedly holds an end part of the suction screen 8. The connecting structure 26 includes a tilting block 34 tiltably supported by the slider 24, and a fastener 35 that cooperates with the tilting block 34 to sandwich and fix the suction screen 8. The suction screen 8 is deformed into a concavo-convex curved shape following the concavo-convex curved shape of the concavo-convex curved part 18, and the second workpiece W2 sucked and held by the suction screen 8 is deformed into the concavo-convex curved shape of the concavo-convex curved part 18 along with the deformation of the suction screen 8. In addition, it is configured that the tilting block 34 facing the concavo-convex curved part 18 tilts and the slide stand 23 slides in a front-rear direction along with the deformation of the suction screen 8.
A tilting shaft 36 of the tilting block 34 is tiltably and pivotally supported by a bearing part 33 provided in an upper part of the slider 24. A thrust bearing 38 that receives a stretching force of the suction screen 8 is disposed between the bearing part 33 and the tilting block 34.
A roller moving structure for moving the bonding roller 7 between the bonding start end and the bonding stop end is provided inside the fixed suction base 16. The roller moving structure includes a roller base 42 that is movably guided by a guide rail 41 fixed to the base 5, a drive screw shaft 43 that is disposed in parallel with the guide rail 41 and rotatably supported by the base 5, a motor 44 that drives the drive screw shaft 43 forward and in reverse, and a female screw body 45 that is mounted on the roller base 42 and meshes with the drive screw shaft 43.
Between a roller base 47 that rotatably supports the bonding roller 7 and the roller base 42, a roller elevating and lowering structure that elevates and lowers the bonding roller 7 following the concavo-convex curved shape of the first workpiece W1 is provided. The roller elevating and lowering structure includes a roller base 47 slidably guided by a vertical guide rail 48 of the roller base 42, an elevating and lowering table 50 fixed to the roller base 42, a motor 51 fixed to the elevating and lowering table 50, an elevating and lowering screw shaft 52 driven forward and in reverse by the motor 51, and a female screw body 53 mounted on the roller base 47 and meshing with the elevating and lowering screw shaft 52.
Along an outer surface of a side part of the movable suction base 17 facing the concavo-convex curved part 18, a group of shielding plates 56 that prevent outside air from entering an inside of the fixed suction base 16 are disposed. Each of the shielding plates 56 is swingably suspended by a bracket 57 mounted on the suction screen 8 via a support shaft 58. It is configured that a gap between the upper opening surface of the movable suction base 17 facing the concavo-convex curved part 18 and the suction screen 8 is closed by the shielding plate 56 in a state where the movable suction base 17 is lowered to the workpiece transfer position.
Adjacent ends of the adjacent shielding plates 56 overlap each other inside and outside. In a state where the movable suction base 17 is lowered to the workpiece transfer position, the group of shielding plates 56 are suspended in a vertical posture by the support shaft 58, and the gap between the upper opening surface of the movable suction base 17 and the suction screen 8 is closed in a state where the adjacent ends of the shielding plates 56 overlap each other inside and outside.
A bonding method according to the present invention includes the steps of: sucking and holding a first workpiece W1 molded in advance into a concavo-convex curved shape in which a protruding curved surface and a concave curved surface are continuous by an upper suction base 4, and placing a second workpiece W2 on a suction screen 8 supported flat by a movable suction base 17 moved to a workpiece supporting position and sucking and holding the second workpiece W2; moving the movable suction base 17 downward to a workpiece transfer position to deform the suction screen 8 into a concavo-convex curved shape following a concavo-convex curved shape of a concavo-convex curved part 18 formed on a fixed suction base 16, and deforming the second workpiece W2 sucked and held by the suction screen 8 into the concavo-convex curved shape of the concavo-convex curved part 18 accompanying the deformation of the suction screen 8; causing the upper suction base 4 and a lower suction base 6 to vertically face each other to match the concavo-convex curved shapes of the first workpiece W1 and the second workpiece W2, and keeping a facing interval between the workpieces W1 and W2 constant along the concavo-convex curved shapes; and bonding the second workpiece W2 to the first workpiece W1 by moving a bonding roller 7 provided inside the fixed suction base 16 from a bonding start end toward a bonding stop end by a roller moving structure in a state where the second workpiece W2 is pressed against the first workpiece W1 by elevating the bonding roller 7 from a standby position to a pressing position by a roller elevating and lowering structure. In the step of bonding the second workpiece W2 to the first workpiece W1, the bonding roller 7 is elevated and lowered along the concavo-convex curved shape of the first workpiece W1 by the roller elevating and lowering structure to bond the second workpiece W2 to the first workpiece W1 with a uniform pressing force.
In the bonding device of the present invention, the lower suction base 6 of the lower suction board 2 is provided with the fixed suction base 16 having a frame structure, and the movable suction base 17 having a frame structure disposed around the fixed suction base 16. Further, the movable suction base 17 is configured to be vertically movable between the workpiece supporting position where the upper opening surface is located above the upper opening surface of the fixed suction base 16 and the second workpiece W2 on the suction screen 8 is sucked and held in a flat posture and the workpiece transfer position where the upper opening surface is lowered below the upper opening surface of the fixed suction base 16 and the suction screen 8 is supported by the upper opening surface of the fixed suction base 16. Furthermore, in a state where the movable suction base 17 is lowered to the workpiece transfer position, the second workpiece W2 supported in a flat posture by the suction screen 8 is sucked and held in the concavo-convex curved shape via the suction screen 8 deformed exactly along the concavo-convex curved part 18, and in this state, the first workpiece W1 and the second workpiece W2 are bonded together.
As described above, in the bonding device according to the present invention, the second workpiece W2 is sucked and held in a flat posture on the suction screen 8 at the workpiece supporting position, and the second workpiece W2 is sucked and held in the concavo-convex curved shape via the suction screen 8 deformed exactly along the concavo-convex curved part 18 at the workpiece transfer position. Therefore, the second workpiece W2 can be deformed from the flat posture to the concavo-convex curved shape while the sucked and held state via the suction screen 8 is maintained in synchronization with the deformation of the suction screen 8 from the workpiece supporting position to the workpiece transfer position. As a result, it is possible to prevent a positional deviation from occurring between the suction screen 8 and the second workpiece W2, so that the workpieces W1 and W2 can be accurately bonded while being precisely positioned although the bonding surface of each of the workpieces W1 and W2 is formed to include a concavo-convex curved surface.
The stretching structure for stretching and holding the suction screen 8 includes the first stretching structure for stretching the suction screen 8 in a direction parallel to the bonding movement direction of the bonding roller 7, and the second stretching structure for stretching the suction screen 8 in a direction orthogonal to the bonding movement direction of the bonding roller 7. The second stretching structure includes the slide stand 23 that slides back and forth, the slider 24 that slides up and down with respect to the slide stand 23, the elevating cylinder 25 that elevates and lowers the slider 24, and the connecting structure 26 that fixedly holds the end part of the suction screen 8. The connecting structure 26 includes the tilting block 34 tiltably supported by the slider 24, and the fastener 35 that cooperates with the tilting block 34 to sandwich and fix the suction screen 8. Then, the suction screen 8 is deformed into the concavo-convex curved shape following the concavo-convex curved shape of the concavo-convex curved part 18, the second workpiece W2 sucked and held by the suction screen 8 is deformed into the concavo-convex curved shape of the concavo-convex curved part 18 along with the deformation of the suction screen 8, and in addition, the tilting block 34 facing the concavo-convex curved part 18 tilts along with the deformation of the suction screen 8, and the slide stand 23 slides in the front-rear direction. According to this, since the tilting block 34 can be tilted and the slide stand 23 can be slid while being dependent on the deformation of the suction screen 8, the suction screen 8 can be deformed into the concavo-convex curved shape while applying an appropriate stretching force to the suction screen 8. In other words, it is possible to deform the suction screen 8 into the concavo-convex curved shape while applying an appropriate stretching force to the suction screen 8 such that wrinkles and slack do not occur and excessive stress is not applied.
When the tilting shaft 36 of the tilting block 34 is tiltably and pivotally supported by the bearing part 33 in the upper part of the slider 24, and the thrust bearing 38 that receives the stretching force of the suction screen 8 is disposed between the bearing part 33 and the tilting block 34, the stretching force of the suction screen 8 acting on the tilting block 34 can be received and released by the thrust bearing 38. Therefore, it is possible to suppress application of excessive stress to the suction screen 8 and to apply an appropriate stretching force to the suction screen 8.
When the roller moving structure for moving the bonding roller 7 between the bonding start end and the bonding stop end is provided inside the fixed suction base 16, a roller moving speed when the bonding roller 7 moves up and down along the concavo-convex curved shape of the first workpiece W1 can be optimized only by controlling a driving rotation speed of the motor 44. Therefore, the second workpiece W2 can be uniformly and appropriately bonded to the first workpiece W1.
The roller elevating and lowering structure for elevating and lowering the bonding roller 7 according to the concavo-convex curved shape of the first workpiece W1 is provided between the roller base 47 and the roller base 42 that support the bonding roller 7, and the roller elevating and lowering structure includes the roller base 47 slidably guided by the vertical guide rail 48 of the roller base 42, the elevating and lowering table 50 fixed to the roller base 42, the motor 51 fixed to the elevating and lowering table 50, the elevating and lowering screw shaft 52 driven forward and in reverse by the motor 51, and the female screw body 53 mounted on the roller base 47. Therefore, the bonding roller 7 can be accurately elevated and lowered along the concavo-convex curved shape of the first workpiece W1 by the elevating and lowering structure, so that the second workpiece W2 can always be pressed against the first workpiece W1 with an even force, and the bonding of both the workpieces W1 and W2 can always be appropriately performed.
When a group of the shielding plates 56 for preventing entry of outside air are disposed along the outer surface of the movable suction base 17 facing the concavo-convex curved part 18, and each of the shielding plates 56 is swingably suspended by the bracket 57 mounted on the suction screen 8 via the support shaft 58, the gap between the upper opening surface of the movable suction base 17 facing the concavo-convex curved part 18 and the suction screen 8 can be closed by the shielding plate 56 in a state where the movable suction base 17 is lowered to the workpiece transfer position. Therefore, in the state where the movable suction base 17 is lowered to the workpiece transfer position, the group of shielding plates 56 prevent the outside air from entering the inside of the lower suction base 6, and the second workpiece W2 can be appropriately and continuously sucked and held along the concavo-convex shape of the concavo-convex curved part 18.
When the adjacent ends of the adjacent shielding plates 56 overlap each other inside and outside, in a state where the movable suction base 17 is lowered to the workpiece transfer position, the group of shielding plates 56 are suspended in a vertical posture by the support shaft 58, and the gap between the upper opening surface of the movable suction base 17 and the suction screen 8 can be closed in a state where the adjacent ends of the shielding plates 56 overlap each other inside and outside. Further, since the shielding plates 56 are disposed in a state where the adjacent ends thereof overlap each other inside and outside, the space occupied by the shielding plates 56 can be made small and compact.
The bonding method according to the present invention includes the steps of: sucking and holding the first workpiece W1 molded into a concavo-convex curved shape by the upper suction base 4, and placing the second workpiece W2 on the suction screen 8 supported by the movable suction base 17 located at the workpiece supporting position and sucking and holding the second workpiece W2; moving the movable suction base 17 downward to the workpiece transfer position to deform the suction screen 8 into a concavo-convex curved shape following a concavo-convex curved shape of the concavo-convex curved part 18 formed on the fixed suction base 16, and deforming the second workpiece W2 sucked and held by the suction screen 8 into the concavo-convex curved shape of the concavo-convex curved part 18 accompanying the deformation of the suction screen 8; causing the upper suction base 4 and the lower suction base 6 to vertically face each other to match the concavo-convex curved shapes of the first workpiece W1 and the second workpiece W2, and keeping a facing interval between the workpieces W1 and W2 constant; and bonding the second workpiece W2 to the first workpiece W1 by elevating the bonding roller 7 provided inside the fixed suction base 16 by the roller elevating and lowering structure to press the second workpiece W2 against the first workpiece W1, and moving the bonding roller 7 toward the bonding stop end by the roller moving structure in this state. Further, in the step of bonding the second workpiece W2 to the first workpiece W1, the bonding roller 7 is elevated and lowered along the concavo-convex curved shape of the first workpiece W1 by the roller elevating and lowering structure to bond the second workpiece W2 to the first workpiece W1 with a uniform pressing force.
According to such a bonding method, the second workpiece W2 that is flat in a normal state can be sucked and held by the concavo-convex curved part 18 of the fixed suction base 16 exactly along the concavo-convex curved shape of the first workpiece W1, and thus both the workpieces W1 and W2 can be precisely positioned and bonded with high accuracy even though the bonding surfaces of the workpieces W1 and W2 are formed of the concavo-convex curved surfaces.
An example of a bonding device according to the present invention is shown in
The bonding device includes an upper suction board 1 on a right side, and a lower suction board 2 on a left side in
The upper suction board 1 is configured to be swingable and openable between an open position indicated by a solid line in
In
As illustrated in
As illustrated in
The stretching structure for stretching and holding the suction screen 8 includes a first stretching structure for stretching the suction screen 8 in a direction (front-rear direction) parallel to a bonding movement direction of the bonding roller 7, and a second stretching structure for stretching the suction screen 8 in a direction (left-right direction) orthogonal to the bonding movement direction of the bonding roller 7. In
Each of the slide stands 23 is formed in an L shape, and a pair of upper and lower slide blocks 27 fixed to an inner surface of the vertical frame part is slidably guided and supported by a guide rail 28 in a front-rear direction fixed to the base 5. Further, in the vertically columnar slider 24, a vertically long slider 29 fixed to a lower inner surface thereof is slidably guided and supported by a guide rail 30 in a vertical direction fixed to an outer surface of the slide stand 23. The elevating cylinder 25 is fixed to a lower surface of a lateral frame part of the slide stand 23, and a piston rod thereof is connected to a lower end of the slider 24.
As illustrated in
In
In
A shielding structure for preventing outside air from entering the inside of the fixed suction base 16 is provided on an outer surface of the side part of the movable suction base 17. This shielding structure is constituted by a group of shielding plates 56 arranged on the outer surface of the side part of the movable suction base 17 facing the concavo-convex curved part 18, and in the present example, a plurality of shielding plates 56 are arranged along the outer surface of the movable suction base 17. As illustrated in
When the pair of workpieces W1 and W2 are bonded, the upper suction board 1 is held at the open position illustrated in
Next, when the movable suction base 17 is moved downward to the workpiece transfer position, since the left and right side edges of the suction screen 8 are supported only by the side frame parts of the fixed suction base 16, the suction screen 8 is deformed along the concavo-convex curved part 18 by the first and second stretching structures as illustrated in
As described above, although the pair of workpieces W1 and W2 facing each other in the vertical direction are roughly positioned, the positional accuracy of both workpieces is not sufficient. In order to improve the positional accuracy to a precise level, shift detectors (CCD cameras) are disposed at two places of the upper suction board 1 to optically detect a positional shift of both the workpieces W1 and W2, an alignment controller recognizes the positional shift based on a result of the detection, and the alignment table 3 is operated based on a signal output from the controller to precisely position both the workpieces W1 and W2. That is, with the second workpiece W2 as a position reference, the upper suction base 4 and the first workpiece W1 are positionally corrected by the alignment table 3, and both the workpieces W1 and W2 are precisely positioned.
In a state where the pair of workpieces W1 and W2 is precisely positioned, as illustrated in
As described above, in the bonding device according to the present example, the second workpiece W2 is sucked and held in a flat posture on the suction screen 8 at the workpiece supporting position, and the second workpiece W2 is sucked and held in the concavo-convex curved shape via the suction screen 8 deformed exactly along the concavo-convex curved part 18 at the workpiece transfer position. Therefore, the second workpiece W2 can be deformed from the flat posture to the concavo-convex curved shape while the sucked and held state via the suction screen 8 is maintained in synchronization with the deformation of the suction screen 8 from the workpiece supporting position to the workpiece transfer position. As a result, it is possible to prevent a positional deviation from occurring between the suction screen 8 and the second workpiece W2, so that the workpieces W1 and W2 can be accurately bonded while being precisely positioned although the bonding surface of each of the workpieces W1 and W2 is formed to include a concavo-convex curved surface. Further, in the state where the workpieces W1 and W2 are bonded by the bonding roller 7, the bonding roller 7 is moved from the bonding start end to the bonding stop end while being moved up and down along the concavo-convex curved shape of the first workpiece W1, so that the workpieces W1 and W2 can be appropriately bonded according to the concavo-convex curved shape with an equal bonding force.
The stretching structure for stretching and holding the suction screen 8 includes the first stretching structure for stretching the suction screen 8 in a direction parallel to the bonding movement direction of the bonding roller 7, and the second stretching structure for stretching the suction screen 8 in a direction orthogonal to the bonding movement direction of the bonding roller 7. The second stretching structure includes a slide stand 23 that slides back and forth, a slider 24 that slides up and down with respect to the slide stand 23, an elevating cylinder 25 that elevates and lowers the slider 24, and a connecting structure 26 that fixedly holds an end part of the suction screen 8. The connecting structure 26 includes a tilting block 34 tiltably supported by the slider 24, and a fastener 35 that cooperates with the tilting block 34 to sandwich and fix the suction screen 8. Then, the suction screen 8 is deformed into a concavo-convex curved shape following the concavo-convex curved shape of the concavo-convex curved part 18, and the second workpiece W2 sucked and held by the suction screen 8 is deformed into the concavo-convex curved shape of the concavo-convex curved part 18 along with the deformation of the suction screen 8. In addition, the tilting block 34 facing the concavo-convex curved part 18 tilts along with the deformation of the suction screen 8, and the slide stand 23 slides in the front-rear direction. According to this, since the tilting block 34 can be tilted and the slide stand 23 can be slid while being dependent on the deformation of the suction screen 8, the suction screen 8 can be deformed into the concavo-convex curved shape while applying an appropriate stretching force to the suction screen 8. In other words, it is possible to deform the suction screen 8 into the concavo-convex curved shape while applying an appropriate stretching force to the suction screen 8 such that wrinkles and slack do not occur and excessive stress is not applied.
Since the tilting shaft 36 of the tilting block 34 is tiltably and pivotally supported by the bearing part 33 in the upper part of the slider 24, and the thrust bearing 38 that receives the stretching force of the suction screen 8 is disposed between the bearing part 33 and the tilting block 34, the stretching force of the suction screen 8 acting on the tilting block 34 can be received and released by the thrust bearing 38. Therefore, it is possible to suppress application of excessive stress to the suction screen 8 and to apply an appropriate stretching force to the suction screen 8.
Since the roller moving structure for moving the bonding roller 7 between the bonding start end and the bonding stop end is provided inside the fixed suction base 16, a roller moving speed when the bonding roller 7 moves up and down along the concavo-convex curved shape of the first workpiece W1 can be optimized only by controlling a driving rotation speed of the motor 44. Therefore, the second workpiece W2 can be uniformly and appropriately bonded to the first workpiece W1.
The roller elevating and lowering structure for elevating and lowering the bonding roller 7 according to the concavo-convex curved shape of the first workpiece W1 is provided between the roller base 47 supporting the bonding roller 7 and the roller base 42, and the roller elevating and lowering structure includes the roller base 47 slidably guided by the vertical guide rail 48 of the roller base 42, the elevating and lowering table 50 fixed to the roller base 42, the motor 51 fixed to the elevating and lowering table 50, the elevating and lowering screw shaft 52 driven forward and in reverse by the motor 51, and the female screw body 53 mounted on the roller base 47. Therefore, the elevating and lowering operation of the bonding roller 7 can be accurately performed along the concavo-convex curved shape of the first workpiece W1 by the roller elevating and lowering structure, and the second workpiece W2 can be constantly pressed against the first workpiece W1 with an even force, and the bonding of both workpieces W1 and W2 can always be appropriately performed.
The group of shielding plates 56 for preventing entry of outside air are arranged along an outer surface of the movable suction base 17 facing the concavo-convex curved part 18, and each of the shielding plates 56 is swingably suspended by the bracket 57 mounted on the suction screen 8 via the support shaft 58. Therefore, in a state where the movable suction base 17 is lowered to the workpiece transfer position, a gap between the upper opening surface of the movable suction base 17 facing the concavo-convex curved part 18 and the suction screen 8 can be closed by the shielding plate 56. Therefore, in the state where the movable suction base 17 is lowered to the workpiece transfer position, the group of shielding plates 56 prevent the outside air from entering the inside of the lower suction base 6, and the second workpiece W2 can be appropriately and continuously sucked and held along the concavo-convex shape of the concavo-convex curved part 18.
Since the adjacent ends of the adjacent shielding plates 56 overlap each other inside and outside, in a state where the movable suction base 17 is lowered to the workpiece transfer position, the group of shielding plates 56 are suspended in a vertical posture by the support shaft 58, and a gap between the upper opening surface of the movable suction base 17 and the suction screen 8 can be closed in a state where the adjacent ends of the shielding plates 56 overlap each other inside and outside. Further, since the shielding plates 56 are disposed in a state where the adjacent ends thereof overlap each other inside and outside, the space occupied by the shielding plates 56 can be made small and compact.
In addition, the bonding method according to the present example includes the steps of: sucking and holding the first workpiece W1 molded into a concavo-convex curved shape with the upper suction base 4, and placing and sucking and holding the second workpiece W2 on the suction screen 8 supported by the movable suction base 17 located at the workpiece supporting position; moving the movable suction base 17 to the workpiece transfer position, and sucking and holding the suction screen 8 and the second workpiece W2 along the concavo-convex curved shape of the concavo-convex curved part 18 of the fixed suction base 16; causing the upper suction base 4 and the lower suction base 6 to vertically face each other to match the concavo-convex curved shapes of the first workpiece W1 and the second workpiece W2, and keeping a facing interval between the first workpiece W1 and the second workpiece W2 constant; and bonding the second workpiece W2 to the first workpiece W1 by elevating the bonding roller 7 provided inside the fixed suction base 16 by the roller elevating and lowering structure to press the second workpiece W2 against the first workpiece W1, and moving the bonding roller 7 toward the bonding stop end by the roller moving structure in this state. Further, in the step of bonding the second workpiece W2 to the first workpiece W1, the bonding roller 7 is moved up and down along the concavo-convex curved shape of the first workpiece W1 by the roller elevating and lowering structure, and the second workpiece W2 is bonded to the first workpiece W1 with a uniform pressing force.
According to the bonding method described above, the concavo-convex curved part 18 of the fixed suction base 16 can suck and hold the second workpiece W2, which is flat in a normal state, exactly along the concavo-convex curved shape of the first workpiece W1, so that the workpieces W1 and W2 can be precisely positioned and bonded with high accuracy even though the bonding surfaces of the workpieces W1 and W2 are formed of the concavo-convex curved surfaces.
In the above embodiment, the upper opening surface of the movable suction base 17 at the workpiece supporting position is flush with the upper opening surface of the fixed suction base 16, but this is not necessary, and the upper opening surface of the movable suction base 17 at the workpiece supporting position may be located above the upper opening surface of the fixed suction base 16. In addition, the tilting shaft 36 may be formed separately from the tilting block 34.
The bonded body obtained by bonding the pair of workpieces W1 and W2 is used, for example, as an instrument panel for integrating and displaying an instrument or a display of an automobile.
1 upper suction board
2 lower suction plate
4 upper suction base
5 base
6 lower suction base
7 bonding roller
8 suction screen
14 suction base
16 fixed suction base
17 movable suction base
18 concavo-convex curved part
23 slide stand
24 slider
25 elevating cylinder
26 connecting structure
33 bearing part
34 tilting block
35 fastening tool
36 tilting shaft
38 thrust bearing
41 guide rail
42 roller base
43 drive screw shaft
44 motor
45 female screw body
47 roller base
50 elevating and lowering table
51 motor
52 elevating and lowering screw shaft
53 female screw body
56 shielding plate
Filing Document | Filing Date | Country | Kind |
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PCT/JP2020/018386 | 5/1/2020 | WO |