JP5024209B2 - Mounting head and component mounting machine - Google Patents

Description

  The present invention relates to a mounting head and a component mounter that are provided on a base member that is relatively moved with respect to a substrate and mounts components on the substrate by a rod-shaped member having a component holding portion at the lower end.

  A mounting head that is provided in a component mounting machine and mounts components on a board is provided on a base member that is moved relative to the board. It is provided with a rod-like member which is provided so as to be movable up and down and has a component holding portion at the lower end. The rod-like member is urged downward by an urging means such as an air cylinder fixed to the elevating member, and is abutted from above with a positioning member fixed to the elevating member to be positioned with respect to the elevating member. ing.

In order to mount the component on the substrate by the mounting head, the component is held by the component holding portion with the rod-shaped member positioned on the lifting member, the mounting head is moved above the substrate, and then the component is mounted on the substrate. Positioning is performed above the target mounting position, and the elevating member is lowered with respect to the base member. As a result, when the rod-shaped member is lowered integrally with the elevating member, the component comes into contact with the substrate, the rod-shaped member receives a reaction force from the substrate via the component and is separated from the positioning member, and the urging force of the urging means The component is pressed against the board with a considerable pressing force. Solder is pre-applied to the target mounting position on the board, and after the component is pressed onto the board, the component is heated by a heater or the like built in the component holding unit, and the solder on the substrate passes through the component. It is heated, the solder is melted, and the component is joined (mounted) on the substrate (Patent Document 1).
JP-A-11-220249

  By the way, both the rod-shaped member and the positioning member are usually made of a magnetic material such as iron. When a tool made of a ferromagnetic material is used at the time of processing or handling, a magnetic device (for example, a motor) Etc.) may be magnetized due to the influence. When at least one of the rod-shaped member and the positioning member is magnetized, an attracting force due to magnetic force is generated between the two members. This attracting force due to the magnetic force causes the component to contact the substrate and the rod-shaped member against the lifting member. When it is pushed up and separated from the positioning member, it acts in the direction of pressing the rod-shaped member against the component. For this reason, a large force is required to separate the rod-shaped member and the positioning member, and the force is applied to the component as a pressing force. Therefore, it is possible to mount the component with a desired appropriate pressing force. There was a problem that it became difficult.

  Therefore, an object of the present invention is to provide a mounting head and a component mounting machine that can always mount components with an appropriate pressing force.

The mounting head according to claim 1 is provided with an elevating member provided so as to be movable up and down with respect to a base member relatively moved with respect to the substrate, and provided with a vertical movement with respect to the elevating member. A rod-shaped member including: a positioning member fixed to the lifting member; a fixing member fixed to the lifting member; urging the rod-shaped member downward to contact the positioning member; A biasing means for positioning the rod-shaped member; and a lifting member lifting / lowering means for lifting the lifting / lowering member with respect to the base member in a state where the rod-shaped member is in contact with the positioning member. Is lowered with respect to the base member, and when the component comes into contact with the substrate, the rod-shaped member that receives the reaction force from the substrate through the component is separated from the positioning member, and the pressing force corresponding to the urging force of the urging means is used. A mounting head for component mounting against the goods to the substrate, at least one rod-shaped member and the positioning member is made of a nonmagnetic material.

  According to a second aspect of the present invention, there is provided the component mounting machine according to the first aspect, wherein the substrate positioning unit that positions the substrate, the base member that is moved relative to the substrate positioned by the substrate positioning unit, and the base member are attached to the base member. The mounting component described above is provided, and the supplied component is held by a rod-shaped member included in the mounting head, and the component is mounted on the substrate positioned in the substrate positioning portion.

  In the present invention, at least one of the rod-shaped member and the positioning member is made of a non-magnetic material. Therefore, when a tool made of a ferromagnetic material is used at the time of processing or handling of these members, it has magnetism. Even when the device is in the vicinity, there is no attractive force due to the magnetic force between the rod-shaped member and the positioning member. For this reason, the pressing force of the component after the elevating member is lowered with respect to the base member, the component contacts the substrate, and the rod-shaped member is separated from the positioning member is only a force corresponding to the urging force of the urging means. . For this reason, an excessive pressing force exceeding the urging force of the urging means does not act on the component when mounting the component, and the component can always be mounted with an appropriate pressing force.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a principal part of a component mounting machine according to an embodiment of the present invention, FIGS. 2, 3 and 4 are sectional views of a mounting head according to an embodiment of the present invention, and FIG. FIG. 5B is a graph showing the time change of the component pressing force when the mounting head is used, and FIG. 5B is a graph showing the time change of the component pressing force when the comparison target mounting head is used. It is.

  In FIG. 1, a component mounting machine 1 is a flip chip type component mounting machine. On a base 2, a substrate supply unit 3, a substrate transfer unit 4, a substrate positioning unit 5, a component supply unit 6, a component reversing unit 7, A component mounting portion 8 is provided. The substrate supply unit 3 supplies the substrate PB to a predetermined position, and the substrate transfer unit 4 transfers the substrate PB supplied by the substrate supply unit 3 to the substrate positioning unit 5. The substrate positioning unit 5 moves the substrate PB transferred by the substrate transfer unit 4 and positions it at a predetermined position. The component supply unit 6 supplies the component P to be mounted on the board PB, and the component reversing unit 7 sucks the component P supplied by the component supply unit 6 and reverses it. The component mounting unit 8 sucks the component P inverted by the component reversing unit 7 and mounts the component P on the substrate PB positioned by the substrate positioning unit 5.

  The substrate supply unit 3 includes a pair of parallel substrate supply conveyors 3a, and the substrate PB is transported in the horizontal direction by the substrate supply conveyor 3a and supplied to a predetermined position.

  The substrate transfer unit 4 includes a transfer head 4b having a substrate suction unit 4a on the lower surface, and a transfer head moving mechanism 4c for moving the transfer head 4b. The substrate PB supplied from the substrate supply unit 3 is adsorbed by the substrate adsorption unit 4a of the transfer head 4b, and transferred to the substrate positioning unit 5 by the movement of the transfer head 4b by the transfer head moving mechanism 4c.

The substrate positioning unit 5 is fixed to the base 2 and is fixed to the base 2. The Y-axis stage 5 b moves relative to the fixed stage 5 a in the Y-axis direction (one direction in the horizontal plane). The X-axis stage 5c moves relatively in the axial direction (the direction in the horizontal plane perpendicular to the Y-axis direction), and the substrate PB transferred from the substrate supply unit 3 by the substrate transfer unit 4 is mounted on the X-axis stage 5c. Placed. The substrate PB placed on the X-axis stage 5c is moved to a predetermined position by moving the Y-axis stage 5b in the Y-axis direction relative to the fixed stage 5a and moving the X-axis stage 5c in the X-axis direction relative to the Y-axis stage 5b. Is positioned.

  The component supply unit 6 includes a fixed stage 6a fixed to the base 2, a Y-axis stage 6b that moves relative to the fixed stage 6a in the Y-axis direction, and an X-axis that moves relative to the Y-axis stage 6b in the X-axis direction. A pallet 6d on which a plurality of parts P to be mounted on the substrate PB is placed is placed on the X-axis stage 6c. The pallet 6d placed on the X-axis stage 6c, that is, the component P is moved by moving the Y-axis stage 6b in the Y-axis direction relative to the fixed stage 6a and moving the X-axis stage 6c in the X-axis direction relative to the Y-axis stage 6b. , Is positioned at a predetermined position.

  The component reversing unit 7 includes a reversing head 7c that rotatably supports the suction reversing unit 7b including the component sucking unit 7a, and a reversing head moving mechanism 7d that moves the reversing head 7c. The component P in the pallet 6d supplied by the component supply unit 6 is adsorbed by the component adsorption unit 7a of the adsorption inversion unit 7b, and the component P is inverted by rotating the adsorption inversion unit 7b around the Y axis (see FIG. Arrow A1) shown in FIG. The component P sucked by the reversing head 7c and turned upside down is positioned at a predetermined position by the movement of the reversing head 7c by the reversing head moving mechanism 7d.

  The component mounting unit 8 includes a moving plate 8a as a base plate to which the mounting head 10 is attached, and a mounting head moving mechanism 8b that moves the moving plate 8a (that is, the mounting head 10). The component P that has been reversed upside down by the component reversing unit 7 and positioned at a predetermined position is sucked and held by the mounting head 10, and the substrate positioned by the substrate positioning unit 5 by the movement of the mounting head 10 by the mounting head moving mechanism 8b. It is moved above the PB and mounted at the target mounting position on the substrate PB.

  2, 3, and 4, the mounting head 10 includes a fixed member 11 that is fixed to the moving plate 8 a, and a lifting member 12 that is movable up and down with respect to the fixed member 11 (that is, with respect to the moving plate 8 a). One or a plurality of rod-like members 14 provided with a component holding portion 13 that is provided so as to be movable in the vertical direction (Z-axis direction) with respect to the elevating member 12 and attracts and holds the component P at the lower end, and fixed to the elevating member 12 The positioning member 15 is fixed to the elevating member 12, and the rod-like member 14 is urged downward to contact the positioning member 15 from above, so that the rod-like member 14 is positioned relative to the elevating member 12. In the state where the air cylinder 16 and the rod-shaped member 14 as the urging means for abutting are in contact with the positioning member 15, the elevating member 12 is moved with respect to the fixed member 11 (with respect to the moving plate 8a). And a lifting member lifting mechanism 17 for lifting and.

  In FIG. 2, the fixing member 11 includes a vertical portion 11a and a horizontal portion 11b formed on the top of the vertical portion 11a. The elevating member 12 includes a vertical portion 12a and upper and lower horizontal portions (upper horizontal portion 12b and lower horizontal portion 12c). A slider portion 12d is provided on the back side (the side facing the fixing member 11) of the vertical portion 12a of the elevating member 12, and on the front side (the side facing the elevating member 12) of the vertical portion 11a of the fixing member 11. The lift guide 11c is provided extending in the vertical direction. The slider portion 12d of the elevating member 12 is guided to be vertically slidable by the elevating guide 11c of the fixed member 11, so that the entire elevating member 12 can be moved up and down with respect to the fixed member 11 (that is, with respect to the moving plate 8a). It has become.

The positioning member 15 is a ring-shaped member having a through-hole 15a extending in the vertical direction, and is fixed to the upper surface side of the lower horizontal portion 12c of the elevating member 12. In the lower horizontal portion 12c of the elevating member 12, a circular through hole 12e that is concentric with the through hole 15a of the positioning member 15 and has an inner diameter substantially the same as the inner diameter of the through hole 15a penetrates in the vertical direction. (See the enlarged views shown in FIGS. 2 and 4).

  The rod-shaped member 14 has an upper half 14a and a lower half 14b having different outer diameters, and the outer diameter of the lower half 14b is smaller than the outer diameter of the upper half 14a. The lower half portion 14b passes through the through hole 12e of the lower horizontal portion 12c of the elevating member 12 and the through hole 15a of the positioning member 15 in the vertical direction, and the step portion at the boundary between the upper half portion 14a and the lower half portion 14b. The lower surface (this surface has a ring shape) can come into contact with the upper surface of the positioning member 15 from above. Hereinafter, the lower surface of the step portion at the boundary between the upper half portion 14a and the lower half portion 14b is referred to as a contact surface 14c (with the positioning member 15) of the rod-shaped member 14. The upper surface of the positioning member 15 is referred to as a contact surface 15b (with the rod-shaped member 14) of the positioning member 15.

  Here, at least one of the rod-shaped member 14 and the positioning member 15 is made of a non-magnetic material (for example, non-magnetic stainless steel, non-magnetic ceramic, non-magnetic titanium alloy, etc.) (enlarged in FIGS. 2 and 4). (See also figure).

  The upper half portion 14a of the rod-shaped member 14 is provided with a flange portion 14d protruding outward in the radial direction of the rod-shaped member 14, and a return is provided between the flange portion 14d and the lower horizontal portion 12c of the elevating member 12. The spring 19 is contracted. By this return spring 19, the rod-shaped member 14 is constantly urged upward with respect to the lower horizontal portion 12 c of the elevating member 12, and the weight of the rod-shaped member 14 is canceled.

  The air cylinder 16 is fixed to the upper horizontal portion 12b of the elevating member 12, and includes a cylinder case 22 having a cylinder chamber 21 into which compressed air is supplied from a compressed air supply port 21a. A piston 23 accommodated in the cylinder chamber 21 and biased downward by compressed air supplied into the cylinder chamber 21 and a piston rod 24 connected to the piston 23 and projecting downward from the cylinder case 22 are provided.

  The upper end of the rod-like member 14 urged upward by the return spring 19 is in contact with the lower end of the piston rod 24 from below, and when the piston moves in the vertical direction in the cylinder chamber 21 (that is, the piston rod 24 is In accordance with this, the rod-shaped member 14 also moves in the vertical direction. When compressed air is supplied into the cylinder chamber 21 from the compressed air supply port 21a, the piston 23 biases the rod-shaped member 14 downward via the piston rod 24, and the rod-shaped member 14 contacts the positioning member 15 from above. Therefore, the rod-shaped member 14 is positioned with respect to the elevating member 12. The rod-shaped member 14 is positioned with respect to the elevating member 12 (that is, the rod-shaped member 14 is in contact with the contact surface 15b of the positioning member 15). This is maintained as long as an upward push-up force does not act on the lower end portion of the.

  The elevating member elevating mechanism 17 extends vertically through the elevating motor 27 fixed to the horizontal portion 11b of the fixing member 11 and the vertical portion 12a of the elevating member 12, and is screwed into a screw groove (not shown) in the vertical portion 12a. The ball screw 28 is provided. When the elevating motor 27 is driven to rotate the ball screw 28 (arrow A2 shown in FIG. 2), the elevating member 12 screwed into the ball screw 28 moves up and down with respect to the fixed member 11 (with respect to the moving plate 8a). Therefore, the rod-shaped member 14 positioned on the lifting member 12 also moves up and down integrally with the lifting member 12.

In order to mount the component P at the target mounting position on the substrate PB by the mounting head 10, the component P is sucked and held by the component holding portion 13 with the rod-shaped member 14 positioned on the lifting member 12, and the mounting head moving mechanism The moving plate 8a is moved relative to the substrate PB by 8b, and the mounting head 10 is moved above the substrate PB. Further, the mounting head 10 is moved so that the component P is aligned above the target mounting position on the substrate PB, and the elevating member 12 is moved relative to the fixed member 11 by the elevating member elevating mechanism 17 (that is, the moving plate). Lower (with respect to 8a).

  As a result, when the rod-shaped member 14 is lowered integrally with the elevating member 12, the component P contacts the substrate PB from above, and the rod-shaped member 14 receives a reaction force from the substrate PB via the component P. Immediately after the component P comes into contact with the substrate PB, the lowering operation of the elevating member 12 is stopped. However, the rod-like member 14 is moved down slightly after the component P comes into contact with the substrate PB. The piston 23 is pushed upward into the cylinder chamber 21 via the piston rod 24 of the air cylinder 16 and is moved upward relative to the elevating member 12. Then, a pressing force corresponding to the urging force of the air cylinder 16 acts on the component P via the rod-shaped member 14. That is, the rod-shaped member 14 presses the component P against the substrate PB with a pressing force corresponding to the urging force of the air cylinder 16 after the component P contacts the substrate PB.

  Solder is applied in advance to the target mounting position on the substrate PB, and after the component P is pressed against the target mounting position on the substrate PB, the component is mounted by a heater or the like (not shown) built in the component holding unit 13. When P is heated, the solder on the substrate PB is heated via the component P, the solder is melted, and the component P is joined (mounted) on the substrate PB. At this time, since the force with which the rod-shaped member 14 presses the component P against the substrate PB (the pressing force of the component P) is a force equivalent to the urging force of the air cylinder 16 as described above, the pressing force of the component P is By adjusting the urging force of the cylinder 16 (specifically, by adjusting the pressure of the compressed air supplied into the cylinder chamber 21), it can be set to an appropriate value.

  As described above, the mounting head 10 provided in the component mounting machine 1 lowers the elevating member 12 with respect to the moving plate 8a by the elevating member elevating mechanism 17, and when the component P comes into contact with the substrate PB, the substrate P is interposed via the component P. The rod-like member 14 that has received the reaction force from the PB is separated from the positioning member 15, and the component P is pressed against the substrate PB with a pressing force corresponding to the urging force of the air cylinder 16 to mount the component.

  Here, as described above, in the mounting head 10 according to the present embodiment, at least one of the rod-shaped member 14 and the positioning member 15 is made of a non-magnetic material. Even when a tool made of a ferromagnetic material is used at the time of handling, etc., or even when a magnetic device (such as a motor) is in the vicinity (therefore, a member that is not a non-magnetic material is temporarily magnetized). Even if it exists, the attractive force by a magnetic force does not arise between the rod-shaped member 14 and the positioning member 15. For this reason, the elevating member 12 is lowered with respect to the fixed member 11 (that is, with respect to the moving plate 8a), the component P comes into contact with the substrate PB, and the rod-like member 14 is pushed up with respect to the elevating member 12, thereby positioning member. When separated from 15, only the pressing force corresponding to the urging force of the air cylinder 16 acts on the component P.

  The graph of FIG. 5A shows a change with time (change with respect to time t) of the pressing force R of the component P when the component is mounted using the mounting head 10 provided in the component mounter 1 in the present embodiment. ing. Further, the graph of FIG. 5B shows a mounting head in which both the rod-shaped member 14 and the positioning member 15 of the mounting head 10 provided in the component mounting machine 1 according to the present embodiment are made of a magnetic material and are magnetized. The time change of the pressing force R of the component P at the time of component mounting using (comparative mounting head) is shown. Here, the pressing force R1 of the component P shown in FIGS. 5A and 5B indicates the pressing force corresponding to the urging force of the air cylinder 16, and t1 is the time when the component P contacts the substrate PB. , T2, after the component P is pressed against the substrate PB by the rod-shaped member 14, the elevating member 12 rises with respect to the fixed member 11 (relative to the moving plate 8 a), and the component holding portion 13 at the lower end of the rod-shaped member 14. Shows the time when the part is separated from the part P.

  From the graph of FIG. 5A, when at least one of the rod-shaped member 14 and the positioning member 15 is made of a nonmagnetic material as in the mounting head 10 in the present embodiment, the pressing force R of the component P It can be seen that does not exceed the pressing force R1 corresponding to the urging force of the air cylinder 16.

  Further, from the graph of FIG. 5B, when both the rod-shaped member 14 and the positioning member 15 are made of a magnetic material and at least one is magnetized, the component P comes into contact with the substrate PB and the rod-shaped member. When 14 moves away from the positioning member 15, an impact force that is as large as the attractive force generated by the magnetic force generated between the rod-shaped member 14 and the positioning member 15 is applied to the substrate PB via the component P. It can be seen that when the rod-shaped member 14 and the positioning member 15 are completely separated from each other, only the pressing force R1 corresponding to the urging force of the air cylinder 16 is obtained.

  As described above, in the mounting head 10 provided in the component mounter 1 according to the present embodiment, at least one of the rod-shaped member 14 and the positioning member 15 is made of a nonmagnetic material. Even when a tool made of a ferromagnetic material is used at the time of processing or handling, or when a magnetic device is in the vicinity, the attractive force due to the magnetic force is between the rod-shaped member 14 and the positioning member 15. Does not occur. Therefore, the pressing force of the component P after the elevating member 12 is lowered with respect to the moving plate 8a, the component P comes into contact with the substrate PB, and the rod-shaped member 14 is separated from the positioning member 15 is applied to the air cylinder 16. Only power equivalent to power is available. For this reason, an excessive pressing force exceeding the urging force of the air cylinder 16 does not act on the component P when mounting the component, and the component P can always be mounted with an appropriate pressing force.

  Further, the component mounting machine 1 according to the present embodiment includes a substrate positioning unit 5 that positions the substrate PB, a moving plate 8a that is a base member that is relatively moved with respect to the substrate PB that is positioned on the substrate positioning unit 5, and movement. A mounting head 10 attached to the plate 8 a is provided, and the supplied component P is held by a rod-shaped member 14 provided in the mounting head 10 so that the component P is mounted on the substrate PB positioned by the substrate positioning portion 5. Since the mounting head 10 is used for mounting the component P on the board PB, the pressing force of the component P at the time of mounting the component can be held at an appropriate value. Since it is possible to prevent the component P from being damaged due to excessive pressing force of the substrate, the productivity and quality of the substrate PB is increased. It is possible to improve.

  Although the embodiments of the present invention have been described so far, the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, the elevating motor 27 and the elevating motor 27 are used as the elevating member elevating means for elevating the elevating member 12 with respect to the moving plate 8a in a state where the rod-shaped member 14 is in contact with the positioning member 15. However, the mechanism for raising and lowering the elevating member 12 relative to the moving plate 8a (base member) is not particularly limited. In the above-described embodiment, the positioning member 15 is attached to the elevating member 12 as a separate member from the elevating member 12, but the positioning member 15 and the elevating member 12 are integrally formed. May be. In this case, the entire elevating member 12 may be made of a nonmagnetic material.

  In the above-described embodiment, an example in which the component mounter is a flip chip type component mounter has been described. However, the component mounter of the present invention is not necessarily limited to the flip chip type.

  Provided is a mounting head and a component mounter that can always mount components with an appropriate pressing force.

The principal part perspective view of the component mounting machine in one embodiment of this invention Sectional drawing of the mounting head in one embodiment of this invention Sectional drawing of the mounting head in one embodiment of this invention Sectional drawing of the mounting head in one embodiment of this invention (A) Graph showing time change of component pressing force when using mounting head according to one embodiment of the present invention (b) Graph showing time change of component pressing force when using comparison target mounting head

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Component mounting machine 5 Board positioning part 8a Moving plate (base member)
DESCRIPTION OF SYMBOLS 10 Mounting head 12 Lifting member 13 Component holding part 14 Rod-shaped member 14c Contact surface 15 Positioning member 15b Contact surface 16 Air cylinder (biasing means)
17 Lifting member lifting mechanism (lifting member lifting mechanism)
PB board P parts

Claims (2)

  An elevating member provided so as to be movable up and down relative to a base member that is moved relative to the substrate, a rod-like member provided so as to be movable up and down relative to the elevating member, and having a component holding portion at the lower end, and an elevating member And a biasing means that is fixed to the lifting member and biases the rod-shaped member downward to abut against the positioning member to position the rod-shaped member with respect to the lifting member. And an elevating member elevating means for elevating the elevating member with respect to the base member in a state where the rod-shaped member is in contact with the positioning member, and the elevating member is lowered with respect to the base member by the elevating member elevating means. When the rod contacts the board, the rod-shaped member that receives the reaction force from the board through the part moves away from the positioning member, and the part is pressed against the board with the pressing force equivalent to the biasing force of the biasing means. A mounting head for, mounting head is characterized in that at least one rod-shaped member and the positioning member is made of a nonmagnetic material.   A substrate positioning unit that positions the substrate, a base member that is relatively moved with respect to the substrate positioned in the substrate positioning unit, and the mounting head according to claim 1 attached to the base member. A component mounting machine characterized in that a component is held by a rod-shaped member provided in a mounting head and the component is mounted on a substrate positioned by a substrate positioning portion.

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