JP2011210895A - Component mounting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a component mounting apparatus while a warp of an X beam is suppressed.SOLUTION: The component mounting apparatus includes a rail 102 extended in the X-axis direction to guide a head 101 thereon slidably in the X-axis direction, a rod type X beam 103 extended in the X-axis direction while the rail 102 is mounted to one end of the Y-axis direction, and a Y-beam 104 extended in the Y-axis direction so as to be guided in the Y-axis direction slidably on the X-beam 103. In the component mounting apparatus, the YZ cross section of the X beam 103 has a shape in which an interval in the Z-axis direction is gradually narrowed symmetrical to a Y axis until it goes to the other end of the Y-axis direction. Moreover, a reinforcing member 105 provided in the component mounting apparatus is formed of a reinforced carbon-fiber resin resistive to a warp of the X beam 103 caused by a difference in the thermal expansion of the rail 102 and the X beam 103, and mounted to the other end in the Y-axis direction of the X beam 103 to be an equal distance to a couple of the rails 102.

Description

  The present invention relates to a component mounting apparatus that is a facility for producing a mounting board having components mounted on a board, and more particularly to a component mounting apparatus including a beam that moves a head linearly.

  2. Description of the Related Art Conventionally, as one of component mounting apparatuses, there is a component mounting machine that holds a component from a component supply unit with respect to a fixed substrate, conveys the component above the substrate, and lowers the component to attach it to the substrate. The mounting machine needs to accurately reproduce the position of the held component in the XY direction (in the horizontal plane). On the other hand, in order to improve the productivity of the mounting board, the speed until the parts are transported from the component supply unit to the upper part of the board and positioned in the XY direction, the speed until the parts are returned to the component supply part after mounting the components, etc. It is also necessary to advance as soon as possible.

  Accordingly, the component mounter includes a Y beam extending and fixed to the base in the Y axis direction, an X beam extending in the X axis direction slidably attached to the Y beam, and the X beam. It has the structure provided with the head attached so that a slide is possible. Thereby, components can be conveyed accurately and at high speed.

  Here, the X beam is attached with a rail that slides directly on the head and linearly guides the head. This is because the rail that generates friction with the head employs a metal that is strong against friction but heavy, and the X beam that supports the rail and the head employs a lightweight metal with structural strength as a material. This is to reduce the weight of the member that moves along the Y beam.

  However, since the rail and the X beam, which are made of different metals and are long in the X-axis direction, are joined, if the temperature of the component mounter changes, the X beam warps due to the bimetal effect. When warping occurs in the X-beam in this way, it becomes difficult to accurately attach components to the board, and corrections that take warpage into account must be added to the data for moving the head, producing component mounters. It will adversely affect sex.

  Therefore, in the inventions described in Patent Document 1, Patent Document 2, and Patent Document 3, a bar-shaped reinforcing member made of the same material as the rail is attached to the side opposite to the side on which the X-beam rail is attached to bend the X-beam. Is preventing. As a result, the warp generated by the rail and the X beam is canceled by the warp generated by the reinforcing member and the X beam, and the rail can be maintained straight.

JP 2002-176294 A JP 2003-168898 A JP 2001-352200 A

  However, in order to cancel the warp generated between the X beam and the rail, the reinforcing member needs to have the same characteristics as the rail, such as a linear expansion coefficient. Accordingly, a reinforcing member having the same shape and weight as the rail is attached to the X beam, and the total weight of the members attached to the X beam increases. That is, it is difficult to move the X beam at high speed, and it becomes difficult to improve the productivity of the component mounting machine.

  The present invention has been made in view of the above problems, and provides a component mounting apparatus that can simultaneously reduce the weight of the X beam and the weight of the reinforcing member while solving the problem of warping of the X beam. It is aimed.

  In order to achieve the above object, a component mounting apparatus according to the present invention guides a head to be slidable in the X-axis direction and is arranged extending in the X-axis direction and arranged in parallel with the Z-axis direction. Two rails, two rails attached to one end in the Y-axis direction, a rod-shaped X-beam extending in the X-axis direction, and the X beam slidably guided in the Y-axis direction A component mounting apparatus including a Y beam extending in the Y axis direction, wherein the X beam has a YZ cross-sectional shape in which the interval in the Z axis direction gradually increases to the other end in the Y axis direction. A reinforcing member that has an axially symmetric and narrow shape and resists warpage of the X beam caused by the difference between the thermal expansion of the rail and the thermal expansion of the X beam, and is made of carbon fiber reinforced resin. Y of the X beam so that it is equidistant from the rail of the book And a reinforcing member attached to the other end of the direction.

  This makes it possible to reduce the weight of the X beam as compared to a case where a square having a side corresponding to the interval at which the two rails are arranged has a cross-sectional shape of the X beam. Further, the cross-sectional shape of the X beam makes it possible to concentrate the stress generated between the two rails and the X beam in the direction of warping the X beam in a narrow range at the other end where the reinforcing member is attached. Therefore, by adopting a carbon fiber reinforced resin that can resist the concentrated stress as a material constituting the reinforcing member, it becomes possible to suppress the X beam warp and maintain it straight. The weight of the member can be reduced. Moreover, since the width in the Z-axis direction is narrow with Y-axis symmetry, it is possible to suppress the stress from being uniformly transmitted to the reinforcing member and twisting the X beam.

  According to the present invention, while solving the problem of X-beam warpage, the weight of the X-beam and the weight of the reinforcing member can be reduced at the same time, and the productivity of the component mounting apparatus can be improved. Become.

It is a perspective view which shows a component mounting apparatus typically. It is a top view which shows the cross section and head of X beam from a side. It is a top view which shows X beam and a head from the back. It is a top view which shows X beam and a head from the front. It is a perspective view which shows typically the component mounting apparatus concerning other embodiment. It is a figure which shows the effect of this invention.

  Next, a component mounter as an embodiment of a component mounting apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view schematically showing a component mounting apparatus.
As shown in the figure, the component mounting apparatus 100 is an apparatus that conveys a component 300 from a component supply unit (not shown) to the upper side of the substrate 200 and attaches (mounts) the conveyed component 300 to the substrate 200. The head 101, the rail 102, the X beam 103, the Y beam 104, and the reinforcing member 105 are provided.

  The head 101 is a device having a holding means 111 (see FIG. 2 and the like) that detachably holds the component 300, and is attached to the rail 102 so as to reciprocate in the X-axis direction.

  In the case of the present embodiment, the holding means 111 is a nozzle that holds the component 300 by vacuum suction, and the head 101 includes eight holding means 111. The head 101 also has a mechanism for causing the holding means 111 to protrude and retract independently in the Z-axis direction, and has a function of holding and transporting the component 300 and attaching the component 300 to the substrate 200.

  The head 101 is not limited to an apparatus for mounting the component 300 on the substrate 200, but may be a head 101 for inspecting the component 300, a head 101 for applying a resin for bonding the component 300, or the like.

  The Y beam 104 is a member that guides the X beam 103 slidably in the Y-axis direction. In the case of this embodiment, two Y beams 104 are arranged in parallel, and each Y beam 104 is fixed to the base 106 in a state of extending in the Y axis direction.

The Y beam 104 may be formed integrally with the base 106.
FIG. 2 is a plan view showing a cross section of the X beam and the head from the side.

FIG. 3 is a plan view showing the X beam and the head from the back.
As shown in these drawings, the rail 102 is a rod-like member that guides the head 101 slidably in the X-axis direction, and is arranged extending in the X-axis direction.

  In the case of this embodiment, the component mounting machine 100 includes two rails 102, and the two rails 102 are arranged in parallel in the Z-axis direction. Since the rail 102 slides relative to the head 101 and generates friction, steel such as SCM435 is selected as a material.

  The rail 102 is fastened to one end portion of the X beam 103 in the Y-axis direction at three or more positions along the X-axis direction by the second fastener 122 with respect to the X beam 103. Specifically, the second fastener 122 is a hexagon socket bolt, and the rail 102 is attached to the X beam 103 by screwing the second fastener 122 into a screw hole provided in the X beam. In the case of the present embodiment, the second fasteners 122 are arranged at equal intervals in the X-axis direction at a pitch of 60 mm.

FIG. 4 is a plan view showing the X beam and the head from the front.
As shown in FIGS. 2 to 4, the X beam 103 is a rod-shaped member to which the rail 102 is attached to one end portion in the Y-axis direction, and is a member that extends in the X-axis direction. The shape of the X-beam 103 in the YZ section (see FIG. 2) has a shape in which the interval in the Z-axis direction gradually narrows in symmetry with the Y-axis until reaching the other end in the Y-axis direction. The X-beam 103 can be reduced in weight by the cross-sectional shape of the X-beam 103 as compared to the case where the square having a length corresponding to the interval at which the two rails 102 are arranged is one side. It becomes possible.

  Further, due to the cross-sectional shape of the X beam 103, the stress in the direction of warping the X beam 103 due to the thermal expansion difference in the X axis direction generated between the two rails 102 and the X beam 103 is expressed in the Y axis direction of the X beam 103. Can be concentrated in a narrow area at the other end of the X-beam 103 which is located on the opposite side of the rail 102 from the rail 102 and away from the rail 102. Therefore, by adopting a carbon fiber reinforced resin capable of resisting the concentrated stress as a material constituting the reinforcing member 105 attached to the other end of the X beam 103, it is opposite to the side on which the rail 102 is attached. It is possible to suppress the thermal expansion in the X-axis direction of the X beam 103 on the side, to suppress the warpage of the X beam 103 due to the difference in thermal expansion with the rail 102 made of different materials, and to maintain the X beam 103 straight. By only disposing the member 105, it is possible to suppress the warp of the entire X beam 103, so that the weight of the member moving along the Y beam 104 can be further reduced. In addition, since the width in the Z-axis direction is narrow with Y-axis symmetry, the stress is uniformly transmitted to the reinforcing member 105 and the X-beam 103 is suppressed from being twisted.

  In general, the X beam 103 is a member that holds the rail 102 that guides the reciprocating motion of the head 101 in the X-axis direction along the X-axis direction, and drops the held component 300 when the reciprocating head 101 vibrates. In addition, it is necessary to suppress bending as much as possible in order to carry the component 300 to an accurate position. Therefore, the X beam 103 needs to have sufficient structural strength. On the other hand, the X beam 103 is a member that linearly reciprocates along the Y beam 104 together with the rails 102 and the head 101. The lighter the light, the faster the component 300 can be conveyed.

  In the case of the present embodiment, the X beam 103 is made of aluminum or a drawing material of an alloy containing aluminum as a main component. The X beam 103 has a hollow shape and is provided with a large number of ribs to ensure structural strength.

  As shown in FIG. 4, the reinforcing member 105 resists the warp in the Y-axis direction of the X beam 103 caused by the difference between the thermal expansion of the rail 102 in the X-axis direction and the thermal expansion of the X beam 103 in the X-axis direction. This is a member that keeps the X beam 103 straight. Further, a carbon fiber reinforced resin is adopted as the material of the reinforcing member 105.

  In the case of this embodiment, the reinforcing member 105 is attached to the X beam 103 with an adhesive. Further, as shown in FIG. 2, the reinforcing member 105 is attached to the other end portion in the Y-axis direction of the X beam 103 so as to be equidistant from the two rails 102. The linear expansion coefficient of the reinforcing member 105 made of the reinforcing member and the carbon fiber reinforced resin is preferably 3.5% or less of the linear expansion coefficient of the rail 102. This is because if the change in the length of the reinforcing member 105 with respect to the temperature change is not sufficiently small with respect to the rail 102, the reinforcing member 105 cannot sufficiently counter the warp of the X beam 103 generated by the rail 102.

  The thickness of the reinforcing member 105 is preferably 6 mm or less from the viewpoint of the workability of the insertion hole. Even if the thickness of the reinforcing member 105 is about 3 mm, warping can be sufficiently suppressed. The width of the reinforcing member 105 is preferably 10 mm or more and 100 mm or less. The length of the reinforcing member 105 is preferably the same as that of the rail 102.

  Note that the attachment of the reinforcing member 105 to the X beam 103 is not limited to an adhesive. As shown in FIG. 5, the reinforcing member 105 may be attached to the X beam 103 with a first fastener 151 such as a bolt. Further, the reinforcing member 105 may be attached to the X beam 103 by using an adhesive and the first fastener 151 in combination.

  For example, when a hexagon bolt is used as the first fastener 151, the reinforcing member 105 can be attached to the X beam 103 by screwing the first fastener 151 into a screw hole provided in the X beam. Further, the reinforcing member 105 is provided with an insertion hole (not shown) through which a bolt that is the first fastener 151 is inserted. The insertion hole may be drilled with a drill or the like after the elongated plate-like reinforcing member 105 is formed, or the reinforcing member 105 may be molded in a shape having the insertion hole.

  As for the 1st fastener 151, it is desirable to fasten the reinforcement member 105 in at least three places of the both ends of the X-axis direction of the reinforcement member 105, and these intermediate parts. In the case of the present embodiment, the position of the first fastener 151 in the X-axis direction matches the position of the second fastener 122 in the X-axis direction. The arrangement pitch of the first fasteners 151 is the same as the arrangement pitch of the second fasteners 122, and the first fasteners 151 are arranged at equal intervals in the X-axis direction at a pitch of 60 mm.

  The first fastener 151 is not limited to a bolt. For example, a rivet or the like may be adopted as the first fastener 151 and the reinforcing member 105 may be fastened to the X beam 103.

Next, examples of the present invention will be described.
FIG. 6 is a diagram showing the effect of the present invention.

  (A) in the same figure is a figure which shows a comparative example, and has shown the case of the reinforcing member of the same material as X-beam of a cross-sectional rectangle, steel rails, and a rail. (B) is a figure which shows the Example of this invention, The cross-sectional rectangle X beam which becomes narrow gradually in a Y-axis direction, steel rails, one reinforcing member made of carbon fiber reinforced resin, and two The case where it equips with the position of equidistance from the rail is shown.

  As shown in the figure, compared with the comparative example (a), if the cross-sectional shape of the X beam is gradually narrowed in the Y-axis direction, the weight cuts half of the weight of the comparative example, 47% It can be seen that the weight can be reduced to a certain extent.

  Further, it is a specification required as a component mounter that the amount of warp of the X beam when the temperature is raised from 20 degrees to 35 degrees is 50 μm or less. In the case of the comparative example (a), the warpage amount is 26 μm, which satisfies the required specifications. On the other hand, (b) shows a comparison by using a reinforcing member made of carbon fiber reinforced resin, although the cross-sectional shape of the X beam is gradually narrowed in the Y-axis direction to reduce the weight of the X beam. It can be seen that the amount of warpage is the same as that in the example (a).

  This is because the stress generated by the rails arranged side by side in the Z-axis direction is concentrated at the position of the reinforcing member, and the stress is offset by the property that the reinforcing member made of carbon fiber reinforced resin slightly shrinks due to temperature rise. It is thought that this is because stress is generated in the direction and the reinforcing member maintains its shape (length in the X-axis direction) and resists the stress.

  In addition, the attachment of the rail with respect to X beam is fastened by the volt | bolt which is a 2nd fastener arrange | positioned all at 60 mm pitch. Further, the amount of warpage is the deflection width of the other end when one end of the X beam in the longitudinal direction is fixed.

  If the component mounting machine 100 as described above is used, the X beam can be reduced in weight compared to a case where a square having a side corresponding to a distance corresponding to the interval between two rails is used as the cross sectional shape of the X beam. It becomes possible. Moreover, the two rails are attached with stress in the direction of warping the X beam due to the difference in thermal expansion in the X-axis direction generated between the two rails and the X beam due to the cross-sectional shape of the X beam according to the present invention. The X beam reinforcing member on the opposite side to the opposite side can be concentrated in a narrow range at the other end. Therefore, by adopting a carbon fiber reinforced resin that can resist the concentrated stress as a material constituting the reinforcing member, it becomes possible to suppress the X beam warp and maintain it straight. The weight of the member can be reduced. Moreover, since the width in the Z-axis direction is narrow with Y-axis symmetry, it is possible to suppress the stress from being uniformly transmitted to the reinforcing member and twisting the X beam. Therefore, the weight of the member moving along the Y beam 104 can be reduced while suppressing the warp of the X beam 103 to be less than the required specification, and the component 300 can be mounted on the board 200 at high speed and accurately.

  The present invention can be used in a component mounting apparatus that freely moves the head in the X and Y directions at high speed. For example, not only a component mounter that mounts components on a substrate, but also an inspection machine that inspects components mounted on the substrate, and an adhesive The present invention can also be used for a coating machine that coats an agent on a substrate.

DESCRIPTION OF SYMBOLS 100 Component mounting apparatus 101 Head 102 Rail 103 X beam 104 Y beam 105 Reinforcement member 106 Base 111 Holding means 122 Second fastener 151 First fastener 200 Substrate 300 Component

Claims (3)

Two rails that are slidably guided in the X-axis direction and that extend in the X-axis direction and are arranged in parallel in the Z-axis direction;
A rod-shaped X-beam, in which the two rails are attached to one end portion in the Y-axis direction, and extend in the X-axis direction;
A component mounting apparatus comprising: a Y beam extending in the Y-axis direction that guides the X beam slidably in the Y-axis direction;
The shape of the Y-Z cross section of the X beam has a shape in which the interval in the Z-axis direction gradually narrows in symmetry with the Y-axis until reaching the other end in the Y-axis direction,
A reinforcing member that resists the warp of the X beam caused by the difference between the thermal expansion of the rail and the X beam, and is made of carbon fiber reinforced resin so as to be equidistant from the two rails. And a reinforcing member attached to the other end of the X beam in the Y-axis direction. The component mounting apparatus according to claim 1, wherein the reinforcing member is bonded to the X beam via an adhesive. 3. The component mounting apparatus according to claim 1, wherein the reinforcing member is fastened to the X beam at three or more locations arranged in the X-axis direction by a first fastener.

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