JP7351645B2 - Component mounting machine - Google Patents

Description

The present disclosure relates to a component mounting machine.

As a component mounting machine equipped with a linear motor, an electronic component mounting apparatus described in Japanese Patent Application Laid-Open No. 2008-108950 (Patent Document 1 below) is known. This electronic component mounting apparatus includes a beam extending in one direction parallel to a work surface, a slider movable in the extending direction of the beam, and a linear motor that moves the slider. The linear motor includes a mover provided on a slider and a stator provided on a beam. A gap is formed between the slider and the mover, and a fan can blow air into the gap to cool the mover.

Different from this linear motor, a linear motor generally called a cancellation type is known. A canceling type linear motor has a mover placed between a pair of stators that extend parallel to each other, and one stator has a magnetic attraction force that attracts the mover, and the other stator has a magnetic attraction force that attracts the mover. It is designed so that the magnetic attraction force that attracts the magnetic force cancels out. Therefore, the offset type linear motor has an advantage over a non-cancelling type linear motor, such as that there is no need to increase the rigidity of the mounting portion of the linear motor.

Japanese Patent Application Publication No. 2008-108950

When a current is passed through the mover, a magnetic attraction force is generated between it and the permanent magnet of the stator. As a result, a thrust force is generated on the movable element, and the movable element generates heat. The heat generated at this time is transmitted from the movable element to the X beam. When heat is transferred to the X-beam, the entire X-beam is deformed due to thermal expansion of each component, and a load is placed on the linear guide supporting the X-beam, reducing its lifespan. Furthermore, the deformation of the X beam affects the attitude of the component mounting head. Therefore, it is preferable that the linear motor generates as little heat as possible.

Considering only the cooling of the movable element, it is possible to widen the gap between the stator and the movable element in a canceling type linear motor in which a pair of stator and movable element are arranged side by side in the X direction. This method cannot be adopted because the specifications of the motor will change. Apart from this method, it is also possible to widen the gap between the linear motor and the table placed above it, but this method cannot be adopted if the component mounting machine has a height restriction.

A component mounting machine of the present disclosure is a component mounting machine that mounts a component on a board, and includes a head unit that transports the component in the X direction and the Y direction and mounts it on the board, and a head unit that extends in the X direction. an X-direction frame that supports the head unit movably in the X-direction, and a stator group including a plurality of stators arranged side by side in the Y-direction, which are arranged to face each other in the X-direction. A linear motor includes a pair of stator groups and a movable element disposed between the pair of stator groups and movable in the Y direction, and a base surface disposed below the pair of stator groups. and a Y-direction frame that movably supports the X-direction frame integrally attached to the movable element, and a cooling medium is brought into contact with the movable element below the base surface of the Y-direction frame. This is a component mounting machine that is equipped with a cooling path.

According to the present disclosure, a cooling path for cooling the mover can be secured without increasing the size of the component mounting machine.

FIG. 1 is a perspective view of a component mounting machine according to a first embodiment. FIG. 2 is a front view of the component mounting machine. FIG. 3 is an enlarged front view of the linear motor shown in FIG. 2. FIG. FIG. 4 is a sectional view taken along line AA in FIG. FIG. 5 is an enlarged cross-sectional view of the movable element shown in FIG. 4. FIG. 6 is a sectional view taken along line BB in FIG. FIG. 7 is an enlarged sectional view of the linear motor shown in FIG. 6. FIG. 8 is a perspective view of a component mounting machine according to the second embodiment. FIG. 9 is a sectional view showing the internal structure of the cooling path, and is a sectional view taken at the same cutting position as FIG. 4. FIG. 10 is a sectional view showing the internal structure of the cooling path, and is a sectional view taken at the same cutting position as FIG. 6. FIG. 11 is a sectional view showing the cooling path of the third embodiment.

[Description of embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.
(1) The component mounting machine of the present disclosure is a component mounting machine that mounts a component on a board, and includes a head unit that transports the component in the X direction and the Y direction and mounts it on the board, and a head unit that transports the component in the X direction and the Y direction and mounts the component on the board. An X-direction frame that extends and supports the head unit movably in the X-direction, and a stator group including a plurality of stators arranged in line in the Y-direction, facing each other in the X-direction. a linear motor having a pair of arranged stator groups and a movable element arranged between the pair of stator groups and movable in the Y direction; and a base arranged below the pair of stator groups. a Y-direction frame that movably supports the X-direction frame that is integrally attached to the movable element; This is a component mounting machine that is provided with a cooling path that brings the medium into contact.

The component mounting machine of the present disclosure includes a so-called offset type linear motor in which a pair of stator groups are arranged facing each other in the X direction and a movable element is arranged between the pair of stator groups. Although it is possible to secure a cooling path by widening the gap between the stator and mover, this increases the size of the component mounting machine in the X direction. Therefore, in the component mounter of the present disclosure, since the cooling path is provided below the base surface disposed below the pair of stator groups, the cooling medium can be brought into contact with the mover while avoiding an increase in the size of the component mounter. can be cooled down.

(2) The Y-direction frame further includes a transport device that transports the substrate, and the Y-direction frame includes a low-rigidity portion located between the base surface and a transport opening for transporting the substrate by the transport device; It is preferable that the cooling path is provided with a high-rigidity part having higher rigidity than a low-rigidity part, and the cooling path is provided in the high-rigidity part.
Providing a cooling path in the low-rigidity portion is not preferable because the rigidity of the low-rigidity portion further decreases. Therefore, by providing a cooling path in the high-rigidity section rather than the low-rigidity section, the cooling effect can be enhanced while preventing a decrease in the rigidity of the low-rigidity section.

(3) It is preferable that the Y-direction frame has a discharge path extending from an end on the transport opening side of both ends of the cooling path to a surface different from the base surface.
Since the cooling medium passes from the cooling path through the discharge path to a surface different from the base surface, the cooling medium can be discharged to the outside of the Y-direction frame.

(4) It is preferable that the end of the cooling path on the side of the transport opening has a tapered shape.
This makes it easier to discharge the cooling medium from the inside of the cooling path to the outside.

(5) It is preferable to include a cooling medium supply unit that is attached to an end of the Y-direction frame, brings the cooling medium into contact with a side of the movable element, and supplies the cooling medium to the cooling path.
Since the cooling medium supply unit can forcibly feed the cooling medium into the cooling path while bringing the cooling medium into contact with the side portion of the mover, cooling efficiency can be increased.

[Details of Embodiment 1 of the present disclosure]
A specific example of the component mounter 10 of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is indicated by the scope of the claims, and is intended to include all changes within the meaning and range equivalent to the scope of the claims.

<Component mounting machine>
As shown in FIGS. 1 and 2, the component mounter 10 includes a base 11, a pair of Y-direction frames 30 rising upward from the base 11, and a pair of X-direction frames spanned between the pair of Y-direction frames 30. It is configured to include a frame 50, a pair of head units 60 provided on the pair of X-direction frames 50, and the like. A conveying device 12 is provided on the base 11 . The transport device 12 has a pair of transport rails 13 , and the substrate B is transported by the pair of transport rails 13 .

<X direction frame>
The pair of X-direction frames 50 are provided on the base 11 to extend in the left-right direction (X-direction). As shown in FIG. 1, the pair of X-direction frames 50 are provided with a pair of upper and lower X-direction rails 51. The head unit 60 is movable in the left-right direction by a pair of upper and lower X-direction rails 51.

A servo motor 52 is attached and fixed above the Y-direction frame 30 at the end of the X-direction frame 50. This servo motor 52 is connected via a coupling to a ball screw attached to the X-direction frame 50, and by rotating the ball screw, the bed unit 60 can be moved in the left and right direction. It has become.

<Head unit>
The head unit 60 is equipped with a plurality of suction nozzles 61, as shown in FIG. It can be placed on the substrate B by adsorption.

<Y direction frame>
The Y-direction frame 30 is provided on the base 11 and extends in the front-rear direction (Y-direction). As shown in FIG. 1, the Y-direction frame 30 includes a pair of front and rear support wall portions 31, and a frame portion 32 spanning between both support wall portions 31.

The pair of left and right frame portions 32 are arranged in parallel and are provided over the entire length of the pair of left and right Y-direction frames 30. Both front and rear end portions of the pair of left and right frame portions 32 are supported by each of the pair of left and right support wall portions 31 .

The Y-direction frame 30 has a transport opening 33 through which the substrate B is transported by the transport device 12. The substrate B is carried into the machine through, for example, the left-hand transport opening 33, and is carried out of the machine through the right-hand transport opening 33.

<Linear motor>
As shown in FIGS. 6 and 7, a linear motor 40 is installed at the upper end of the Y-direction frame 30. The linear motor 40 includes a pair of stator groups 41 arranged opposite to each other in the left-right direction, and a movable element 42 arranged between the pair of stator groups 41 and movable in the Y direction. ing. The stator group 41 includes a plurality of stators arranged side by side in the Y direction. The stators are made of permanent magnets, and a plurality of stators are arranged at equal pitches from the front end to the rear end of the Y-direction frame 30, and these stators are collectively attached and fixed to a support plate to form a stator group 41. ing.

A surface of the Y-direction frame 30 located below the pair of stator groups 41 is a base surface 34 . A guide wall 35 rising upward from the base surface 34 is provided at the upper end of the Y-direction frame 30. The guide wall portion 35 is located on the inboard side of the base surface 34.

The X-direction frame 50 is integrally attached to the movable element 42 via a table 43. The table 43 is attached to the upper part of the movable member 42 in such a manner that it projects from above the Y-direction frame 30 toward the inside of the machine.

The table 43 is placed on the upper part of the guide wall 35 via a linear guide 44. A plurality of coils are arranged inside the movable element 42, and when these coils are energized and the movable element 42 is driven in the Y direction between the pair of stator groups 41, the linear guide 44 The table 43 is guided in the Y direction, and the X direction frame 50 is movable in the Y direction accordingly. Therefore, the head unit 60 can be moved to a desired position in the front-rear direction and the left-right direction by the servo motor 52 and the linear motor 40.

<Fan>
A pair of front and rear fans 36 are provided at both front and rear ends of the frame portion 32, as shown in FIGS. 1 and 3. The front fan 36 sends normal temperature air backward from the front of the frame portion 32 to between the pair of stator groups 41, and the rear fan 36 sends normal temperature air from the rear of the frame portion 32 to between the pair of stator groups 41. Send room temperature air forward. Room temperature air sent from the front fan 36 is blown to the front side of the front mover 42, and room temperature air sent from the rear fan 36 is blown to the rear side of the rear mover 42. be sprayed.

<Cooling path>
As shown in FIGS. 4 and 5, the Y-direction frame 30 is provided with a cooling path 37 that cools the movable element 42. As shown in FIGS. The cooling path 37 is provided below the base surface 34 of the frame portion 32 of the Y-direction frame 30. Specifically, the frame portion 32 includes a low-rigidity portion 38 and a pair of high-rigidity portions 39 disposed on both front and rear sides of the low-rigidity portion 38, and the cooling path 37 is connected to the front high-rigidity portion. 39 and the high-rigidity portion 39 on the rear side.

The low-rigidity portion 38 is a portion between the transport opening 33 and the base surface 34, and the high-rigidity portion 39 is a portion above the support wall portion 31. Therefore, the low-rigidity portion 38 is easily bent and deformed toward the transport opening 33 when a force is applied from above, and has low rigidity. On the other hand, the high-rigidity portion 39 has higher rigidity than the low-rigidity portion 38 because the support wall portion 31 prevents bending deformation when a force is applied from above.

If a cooling path is provided in the low-rigidity portion 38, the rigidity of the low-rigidity portion 38 will further decrease, so there is a risk that the low-rigidity portion 38 of the frame portion 32 may be deformed or easily vibrated. On the other hand, when the cooling path 37 is provided in the high-rigidity section 39, the rigidity of the high-rigidity section 39 is not reduced because it is supported from below by the support wall section 31, so the high-rigidity section 39 is easily deformed and vibrates. There is no risk that this will happen.

When air is sent between the pair of stator groups 41 by the front fan 36, the air collides with the front side of the front movable element 42, thereby cooling the movable element 42. Thereafter, the air is sent into the front cooling path 37 and comes into contact with the lower part of the mover 42 to further cool the mover 42, and is discharged from the rear end of the front cooling path 37 to the base surface 34 side. Ru.

Similarly, when air is sent between the pair of stator groups 41 by the rear fan 36, the air collides with the rear side of the rear movable element 42, thereby cooling the movable element 42. . After that, the air is sent into the rear cooling path 37 and comes into contact with the lower part of the mover 42 to further cool the mover 42, and is discharged from the front end of the rear cooling path 37 to the base surface 34 side. be done.

[Details of Embodiment 2 of the present disclosure]
Next, a second embodiment will be described with reference to FIGS. 8 to 10. The component mounter 110 of the second embodiment has a discharge path 70 added to the cooling path 37 of the component mounter 10 of the first embodiment, and the other configurations are the same as the component mounter 10 of the first embodiment. . The same components as the component mounter 10 of the first embodiment are designated by the same reference numerals as those of the first embodiment.

As shown in FIG. 9, the discharge route 70 includes a first discharge route 71 extending downward from the end on the transport opening 33 side of both ends of the cooling route 37, and a first discharge route 71 extending downward from the lower end of the first discharge route 71 for transport. A second discharge path 72 extends on the opposite side from the opening 33. The first discharge path 71 is provided from the frame portion 32 to the support wall portion 31 . The second discharge path 72 is provided inside the support wall portion 31, as shown in FIG. As shown in FIGS. 8 and 9, the second discharge path 72 on the front side has a discharge port 73 that opens on the front surface of the support wall portion 31, and the second discharge path 72 on the rear side has a discharge port 73 that opens on the front surface of the support wall portion 31. It has an open discharge port 73.

The air sent into the cooling path 37 by the fan 36 is sent into the first exhaust path 71 from the end on the conveyance opening 33 side of both ends of the cooling path 37, and from the lower end of the first exhaust path 71 to the second exhaust path 71. It is fed into the discharge path 72 and discharged from the discharge port 73 to the outside of the component mounter 110 . In this way, the speed of the air flowing through the cooling path 37 becomes faster, so the ability to cool the movable element 42 becomes faster, and the movable element 42 can be cooled more powerfully than the component mounter 10 of the first embodiment.

[Details of Embodiment 3 of the present disclosure]
Next, Embodiment 3 will be described with reference to FIG. 11. The component mounter 210 of the third embodiment has a tapered end on the transport opening 33 side of the cooling path 37 of the component mounter 10 of the first embodiment, and the other components are the same as those of the first embodiment. It is the same as the mounting machine 10. The same components as the component mounter 10 of the first embodiment are designated by the same reference numerals as those of the first embodiment.

The cooling path 237 of this embodiment has a tapered portion 237A. The tapered portion 237A is provided at the end on the conveyance opening 33 side of both ends of the cooling path 237, and is disposed in the high rigidity portion 39. The tapered portion 237A has a tapered surface that approaches the base surface 34 as it approaches the transport opening 33. Therefore, the air sent into the cooling path 237 by the fan 36 is guided by the tapered portion 237A and smoothly discharged toward the base surface 34 side.

<Other embodiments>
(1) Although the entire cooling path is arranged in the high-rigidity section 39 in the first to third embodiments described above, a part of the cooling path may be arranged in the low-rigidity section 38.

(2) Although room temperature air is supplied to the cooling path in the first to third embodiments described above, cooling gas may be supplied to the cooling path.

(3) Although the fan 36 is attached to the end of the Y-direction frame 30 in the first to third embodiments, the fan 36 may not be attached.

(4) In the second embodiment, the discharge port 73 of the discharge path 70 opens at the front or rear surface of the support wall portion 31, but the discharge port may open at the side surface of the support wall portion 31.

(5) Although the tapered portion 237A has a tapered surface in the third embodiment, the tapered portion may have an arcuate curved surface.

(6) In Embodiments 1 to 3 above, the cooling path is provided to extend horizontally along the base surface 34, but the cooling path is provided to extend vertically at right angles to the base surface 34. It is also possible to have one. For example, in the embodiment shown in FIG. 9, the fan 36 may not be installed but may be opened, and instead a fan may be provided at the position of the exhaust port 73 to blow air into the mounting machine. Furthermore, as a modification example, even if the surface on which the fan 36 is installed in FIG. 9 is not open and is covered with a wall, etc., the mover can be cooled by providing a cooling path similar to the cooling path 37 in FIG. 9. There is an effect. Furthermore, if a cooling path similar to the cooling path shown in FIG. 9 is not provided and a path similar to the first discharge path 71 is opened in the base surface 34 corresponding to the support wall portion 31, the mover can be cooled in that portion. I can.

DESCRIPTION OF SYMBOLS 10, 110, 210...Component mounting machine 11...Base 12...Transportation device 13...Transportation rail 30...Y direction frame 31...Support wall part 32...Frame part 33...Transportation opening 34...Base surface 35...Guide wall part 36 ...Fan 37, 237...Cooling path 237A...Tapered part 38...Low rigidity part 39...High rigidity part 40...Linear motor 41...Stator group 42...Mover 43...Table 44...Linear guide 50...X direction frame 51...X Directional rail 52... Servo motor 60... Head unit 61... Suction nozzle 70... Discharge route 71... First discharge route 72... Second discharge route 73... Discharge port B... Board E... Parts

Claims (4)

A component mounting machine that mounts components on a board,
a head unit that transports the component in the X direction and the Y direction and mounts it on the substrate;
an X-direction frame extending in the X-direction and supporting the head unit movably in the X-direction;
A stator group including a plurality of stators arranged side by side in the Y direction is arranged between a pair of stator groups arranged opposite to each other in the X direction and a stator group arranged in the Y direction. a linear motor having a movable element movable in a direction;
a Y-direction frame extending in the Y-direction and movably supporting the X-direction frame integrally attached to the mover;
The Y-direction frame has a pair of support wall portions disposed at both ends of the Y-direction frame, and a base surface disposed below the pair of stator groups, and is supported by the pair of support wall portions. It consists of a frame part and
A cooling path for bringing a cooling medium into contact with the mover is provided below the base surface in the frame portion,
The cooling medium is attached to the Y-direction end of the frame portion, and the cooling medium is sent between the pair of stator groups in the Y-direction to contact the Y-direction end of the side portion of the mover. The component mounting machine further includes a cooling medium supply section that supplies the cooling medium to the cooling path by turning the cooling medium downward and entering the cooling path. Further comprising a transport device that transports the substrate,
The frame portion includes a low-rigidity part located between the base surface and a transport opening for transporting the substrate by the transport device, and a high-rigidity part having higher rigidity than the low-rigidity part. It consists of
The component mounting machine according to claim 1, wherein the cooling path is provided in the high rigidity section. 3. The component mounting machine according to claim 2, wherein the Y-direction frame has a discharge path that extends from an end on the transport opening side of both ends of the cooling path to a surface different from the base surface. 4. The component mounting machine according to claim 2, wherein an end of the cooling path on the side of the transport opening is tapered.

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