JP2008093697A - Flux film forming apparatus, and method for smoothing surface of flux - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformly keep a formed flux film by eliminating the drag of the flux to be caused during the return motion of a flux container. <P>SOLUTION: A flux film forming apparatus 42 comprises a table surface 46 having a recessed portion 50 for forming a flux film. The recessed portion 50 is filled with the flux 40B by horizontally moving the flux container 48 having an opened bottom surface 52 relative to the table surface. A scraper 72 is provided for scraping down the flux 40B stuck on the chamfered portion 60 of the vertical wall surface 58 of the flux container 48 by sliding on the chamfered portion 60 of the vertical wall surface 58 of the flux container 48 by interlocking with the horizontal movement of the flux container 48. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flux film forming apparatus and a flux surface smoothing method using the film forming apparatus.

  When mounting an electronic component on a substrate in a surface mounter, an operation of applying a flux to the mounting portion of the electronic component is performed. This operation is performed in such a manner that the flux is transferred to the contact portion by bringing the mounting portion of the electronic component into contact with the flux surface that has been made into a thin film by the flux film forming apparatus. Therefore, in order to perform the transfer operation satisfactorily, it is necessary to uniformly form a flux film for transfer.

  Conventionally, the film formation of this flux has been performed using an apparatus as shown in FIG.

  The flux film forming apparatus 10 includes a table surface 14 having a recess 12 for forming a flux film. A flux container 18 is placed on the table surface 14 so as to be horizontally movable. The flux container 18 accommodates the flux 20 therein, and the bottom surface 16 is opened. Therefore, when the flux container 18 moves from the position Pa to the position Pb on the concave portion 12, the bottom surface 16 itself of the flux container 18 functions as a so-called scraper (spar) and corresponds to the depth d of the concave portion 16. A flux film 20A having a thickness to be formed can be formed.

  However, in the flux film forming apparatus 10 according to this configuration, the mass 20B of the flux 20 that has been scraped by the movement of the flux container 18 is not recovered by the recovery unit 22 due to the viscosity of the flux 20B itself. When the flux container 18 returns, there is a problem that the flux container 18 may come back as it is dragged.

  As one answer to cope with such a problem, Patent Document 1 discloses a technique in which a shape of the flux container 18 is added. The outline is shown in FIG. For the sake of convenience, the same reference numerals are assigned to portions that can be substantially identical to the previous conventional example. In this technique, the flux container 18A is formed in a circular shape, and when the flux container 18A advances toward the concave portion 12, the excess flux 24 is pushed as far as possible on both sides in the direction of travel (broken arrows). Reference), which is an attempt to reduce the amount of flux drawn back together when the flux container 18 returns.

JP 2002-172460 A

  However, since the film forming apparatus disclosed in Patent Document 1 has a structure in which a thin deposition layer of the flux 20B existing on the table surface 14 is pushed away to both sides, it is certainly deposited at the center on the table surface 14. The flux 24A can be reduced, but conversely, the deposition on both sides tends to increase. Therefore, when the flux container 18 returns in the reverse direction, “sagging” of the flux occurs on both sides of the recess 12, which may have a negative effect on uniform film formation.

  Further, when the flux container 18 is advanced to the concave portion 12 side, the excess flux 24 that crawls along the standing wall surface of the flux container 18 hangs down on the upper portion of the film-forming concave portion 12 when returning. In some cases, the phenomenon may occur, and the film thickness may be non-uniform even in the central portion of the recess 24 in the width direction.

  The present invention has been made in order to solve such a conventional problem, and when the flux container is moved forward, the excess flux lump is again put on the recess when the flux container returns. An object of the present invention is to make it possible to form a uniform flux film over the entire recess so as not to be pulled back.

  The present invention includes a table surface having a concave portion for forming a flux film, and forming a flux film that fills the flux in the concave portion by horizontally moving a flux container whose bottom surface is open relative to the table surface. In the apparatus, the above problem is solved by providing a scraper that slides on the vertical wall surface of the flux container in conjunction with the horizontal movement of the flux container and scrapes off the flux adhering to the vertical wall surface. It is a thing.

  That is, in the present invention, when the flux container reaches a position beyond the upper part of the concave portion due to the horizontal movement of the flux container, the scraper is slid along the vertical wall in conjunction with the horizontal movement. After the flux adhering to the standing wall surface is scraped off by sliding, the flux container is returned to the concave portion side. As a result, the flux container can be returned in a state where the flux is not adhered on the standing wall surface, and reliably prevents the uniformity of the flux film already formed in the recess. be able to.

  In a preferred embodiment of the present invention, the scraper is constituted by a part of a spring body formed by bending a rod-shaped material, the other part of the spring body is fixed to the table surface side, and the part is a flux. It is set as the structure which functions as the said scraper by sliding along the said standing wall surface in response to the said horizontal movement of a container. Thereby, the scraper which performs the movement interlock | cooperated with the horizontal movement of the flux container by simple structure can be comprised.

  Further, it is more preferable that a chamfered portion is formed at the lower part of the standing wall of the flux container toward the rear side in the traveling direction of the flux container. Thereby, the flux adhering to the standing wall surface can be scraped off more smoothly and more reliably.

  In addition, when the recovery part which can collect | recover the flux scraped off from the said standing wall surface is formed near the terminal part of the said horizontal movement of the said flux container in a table surface, the flux on the standing wall surface scraped off by the scraper is made. It becomes possible to collect smoothly, and it becomes possible to more reliably prevent the flux from returning.

  According to the present invention, an excessive flux lump that has been squeezed when the flux container is advanced is not pulled back onto the recess again when the flux container returns, and is always uniform over the entire recess. A flux film can be formed.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view of a flux film forming apparatus according to an example of the embodiment, and FIG. 2 is a front sectional view thereof.

  In this film forming apparatus 42, a table surface 46 is formed on a base 44, and a flux container 48 can move (relatively) horizontally on the table surface 46. On the table surface 46, a recess 50 for forming a flux film is formed. On the other hand, the bottom surface 52 of the flux container 48 is open. In this embodiment, the standing wall 54 of the flux container 48 is substantially square in plan view, and the flux 40 is accommodated therein. A chamfered portion 60 having an angle α (see FIG. 4) is formed at the lower portion of the standing wall 54 toward the rear side in the traveling direction of the flux container 48, and the standing wall surface 58 (the surface of the standing wall 54) is rearward in the traveling direction. It is bent to the side. In this specification, for the sake of convenience, the direction in which the flux container 48 moves toward the recess 50 is defined as the traveling direction, and the opposite direction is defined as the return direction. The function of the chamfered portion 60 will be described in detail later. Reference numeral 56 denotes a lid placed on the upper portion of the standing wall 54.

  The film forming apparatus 42 is provided with a spring body 62 formed by bending a rod-shaped material into a substantially U shape in plan view. The spring body 62 includes a pair of fixing portions 64A and 64B, a pair of arm portions 68A and 68B, and a scraper 72. The fixing portions 64A and 64B are located on the outermost side of the spring body 62, and are fixed on the base 44 (table surface side). The arm portions 68A and 68B rise from the respective end portions 66A and 66B of the pair of fixing portions 64A and 64B at a rising angle θ. The scraper 72 corresponds to a portion connecting the top portions 70A and 70B of the arm portions 68A and 68B. The rising angle θ of the arm portions 68A and 68B can be reduced when a downward load is applied to the arm portions 68A and 68B via the scraper 72. In other words, the scraper 72 can be pushed down from the height H1 corresponding to the rising angle θ to the height H2 that is substantially the same as the table surface 46, and is lifted by the spring force of the arm portions 68A and 68B when the load is removed. The angle can be returned to the height corresponding to the angle θ (described later).

  Reference numeral 80 in the figure denotes a flux reservoir (collection unit) that is formed near the end of the horizontal movement of the flux container 48 on the table surface 46 and can collect the flux 40 scraped from the standing wall surface 58. Reference numeral 82 denotes a flux pool on the opposite side.

  Next, the operation of the film forming apparatus 42 will be described.

  The flux container 48 moves horizontally relative to the table surface 46 in close contact with the table surface 46, and moves from the position P1 to the position P4 (see FIGS. 1 and 3).

  As shown in FIG. 3A, when the flux container 48 is located at the position P1, the arms 68A and 68B of the spring body 64 maintain the rising angle θ. Accordingly, the scraper 72 is at the maximum height H1.

  As shown in FIG. 3B, when the movement of the flux container 48 proceeds and reaches the vicinity of the position P <b> 2, the surplus flux 40 </ b> B starts to be accumulated near the chamfered portion 60 of the standing wall 58.

  FIG. 3C shows a state in which the movement of the flux container 48 further proceeds and the standing wall 58 just contacts the scraper 72. At this time, the flux container 48 is at a position P3 slightly before the position P4 that is the end of movement.

  When the flux container 48 reaches the position P3, as shown in an enlarged view in FIG. 4A, the scraper 72 starts to descend while sliding on the chamfer 60 from the height H1 corresponding to the rising angle θ, At the stage where the flux container 48 reaches the position P4, it is lowered to the lowest height H2 as shown in FIG. As a result, almost all of the flux 40B adhering to the vicinity of the chamfered portion 60 of the standing wall 58 is scraped off and accommodated in the flux reservoir 80.

  Returning to FIG. 3, this state is the state shown in FIG. Since the flux 40B adhering to the standing wall 58 (the chamfered portion 60) is forcibly scraped and accommodated in the flux reservoir 80 in this way, when the flux container 48 returns toward the position P1, the standing wall 58 The flux 40B is not adhered to the upper surface of the flux film A stretched on the recess 50, and the smooth surface scraped off by the bottom surface 52 of the flux container 48 is maintained as it is (FIG. 3 ( E)).

  In the above embodiment, the scraper that slides on the vertical wall surface of the flux container in conjunction with the horizontal movement of the flux container is configured by a part of a spring body formed by bending a rod-shaped material. In the present invention, the structure by which the scraper is slid on the standing wall surface is not particularly limited. In short, when the vertical movement of the flux container reaches the position where the vertical wall of the flux container exceeds the upper part of the recess, the scraper is slid along the vertical wall in conjunction with the horizontal movement. If you can do it.

  It is preferable that the horizontal movement of the flux container itself can be used as a “driving source” for sliding the scraper as in the above-described embodiment, because it is simple in structure and low in cost, but for example, more complete scraping is possible. If required, the configuration may be such that when the flux container reaches the end position (or near the end) by horizontal movement, an electric scraper that reciprocates on the vertical wall is switched on. It is included in the concept of “scraper sliding on the vertical wall surface of the flux container in conjunction with the horizontal movement of the flux container” in the invention.

  In this regard, in the above embodiment, the chamfered portion is formed at the lower portion of the standing wall of the flux container so that the scraper can slide more smoothly. However, in the case of an electric scraper, of course. For example, by appropriately setting the length and rising angle of the arm portion of the spring body, the scraper can be configured to descend while sliding on the standing wall surface even without the chamfered portion. Therefore, in the present invention, the formation of the chamfered portion is not necessarily an essential requirement.

  Further, in the above-described embodiment, the flux scraped off so as to form an accommodating portion capable of accommodating the flux scraped from the standing wall surface near the terminal end portion of the horizontal movement of the flux container on the table surface is difficult to return again. For example, when the distance from the concave part for forming the flux film to the terminal part of the horizontal movement of the flux container can be made large, the formation of the accommodating part may be omitted in some cases.

  The present invention can be used in the field of forming a flux film for performing flux application when mounting electronic components on a substrate in a surface mounter.

1 is a schematic plan view of a flux film forming apparatus according to an example of an embodiment of the present invention. Same sectional view Working process diagram showing the process of the flux container moving on the table surface Partial enlarged view showing the process of scraping off the flux by the scraper An example of the conventional flux film-forming apparatus is shown, (A) is a schematic plan view thereof, and (B) to (D) are front sectional views showing a work process in which the flux container moves on the table surface. The other conventional example is shown, (A) is a schematic plan view thereof, (B) is a front sectional view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 40 ... Flux 42 ... Film-forming apparatus 46 ... Table surface 48 ... Flux container 50 ... Concave 52 ... Bottom surface 54 ... Standing wall 56 ... Lid body 58 ... Standing wall surface 60 ... Chamfering part 62 ... Spring body 64 ... Fixed part 66 ... End part 68 ... arm part 70 ... top part 72 ... scraper 80, 82 ... flux reservoir

Claims (5)

In the film forming apparatus for flux that fills the flux in the recess by horizontally moving a flux container having a table surface having a recess for flux film formation and having a bottom surface opened with respect to the table surface.
A flux film forming apparatus comprising a scraper that slides on a vertical wall surface of the flux container in conjunction with horizontal movement of the flux container and scrapes off the flux adhering to the vertical wall surface. In claim 1,
The scraper is composed of a part of a spring body formed by bending a rod-shaped material,
The other part of the spring body is fixed on the table surface side, and the part functions as the scraper by sliding along the standing wall surface in conjunction with the horizontal movement of the flux container. A featured flux deposition system. In claim 1 or 2,
A flux film forming apparatus, wherein a chamfered portion is formed at a lower portion of a standing wall surface of the flux container toward a rear side in a traveling direction of the flux container. In any one of Claims 1-3,
A flux film forming apparatus characterized in that a collecting unit capable of collecting the flux scraped off from the standing wall surface is formed in the vicinity of the end of the horizontal movement of the flux container on the table surface. A flux surface in a flux film forming apparatus that includes a table surface having a concave portion for forming a flux film, and that horizontally moves a flux container having a bottom surface opened relative to the table surface, so that the flux fills the concave portion. In the smoothing method of
A step of sliding a scraper along the vertical wall in conjunction with the horizontal movement when the vertical wall of the flux container has reached a position beyond the upper portion of the recess by horizontal movement of the flux container;
A method of smoothing a flux surface in a flux film forming apparatus, comprising: scraping off the flux adhering to the standing wall surface by the sliding and then returning the flux container to the concave portion side.

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