JP2017013116A - Thread solder tip opening in thread solder feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thread solder feeding device which is configured to prevent a flux-cored thread solder from scattering, while preventing adherence, deposition and sticking of the flux to avoid malfunction in feeding during feeding of the flux-core thread solder containing adhesive resin.SOLUTION: In a thread solder feeding step, a flux is fed without being opened as a preliminary processing to allow a thin film of solder alloy to remain closed, and then a tip of the fed thread solder is opened.SELECTED DRAWING: Figure 11

Description

  The present invention relates to prevention of scattering of a yarn solder feeder used in an automatic soldering apparatus for flux-embedded yarn solder.

For the purpose of preventing solder generated during soldering and flux scattering of the thread solder containing the flux, the flux is opened along the line of the thread solder by a pin feed roller of the thread solder feeder. The open solder cross-sectional shape includes [Fig. 1] a), b), c), d), and other forms.
In automatic soldering, thread solder whose flux is opened by the processing is fed to a soldering point through a feed guide or the like.
In recent years, high soldering is required for miniaturization of soldered parts, narrow spacing between parts, flexible board mounting, vibration, thermal shock, insufficient bonding force, solder short, solder scattering, flux scattering, separation due to flux residue, etc. Reliability is important. For this reason, thread solder in which an adhesive resin is included in the flux has been used.

Problems to be solved by the invention

Since only the adhesive resin is contained is insufficient to prevent solder scattering, flux laparotomy is required.
When flux is opened with a pin feed roller of a thread solder feeder with a flux opening process, if the flux does not contain adhesive resin, the pin feed roller, feed guide, and other threads The flux adheres to the solder contact portion or the like but does not hinder the thread solder feeding.
In recent years, flux containing adhesive resin, which has been used, adheres, accumulates, and adheres to pinch feed rollers, feed guides, and other thread solder contact portions, making yarn solder feed impossible. Therefore, the thread solder feeder for thread solder containing the flux does not function and automatic soldering cannot be performed.

Means for solving the problem

  The soldering roller of the yarn solder feeder is preliminarily processed so that the flux is not opened, and the solder alloy thin film is left as it is, and the flux is not opened, and the finish is performed to open at the tip of the feed guide. .

Effect of the invention

  Adhesive resin-containing flux is prevented from adhering and accumulating at a feed mechanism portion such as a pinch roller of a yarn solder feeder, a feed guide, and other yarn solder contact portions, thereby enabling automatic soldering. Furthermore, if hot wire, hot air, induction heating, high-frequency heating, light beam, or laser light is used for finishing, an additional heat function is added, which contributes to prevention of solder and flux scattering and shortening of the soldering time.

  Cross section of an example of laparotomy of flux-embedded yarn solders (i) to (d).   The cross section of the pre-processed yarn solder of the form of a) of FIG.   FIG. 1 is a cross-sectional view, a top surface, and a side cross-section of a finish-processed yarn solder in the form of a) in FIG.   The cross section of the pre-processed yarn solder of the form of b) of FIG.   The cross section of the finishing thread solder of the form of b) of FIG.   The cross section of the pre-processed yarn solder of the form of (c) of FIG.   FIG. 1 is a cross-sectional view, a top surface, and a side cross-section of a finish-processed yarn solder in the form shown in FIG.   Section of the pre-processed yarn solder in the form of d) in FIG.   FIG. 1 is a cross-sectional view, a top surface, and a side cross-section of a finish-processed yarn solder in the form of d) in FIG.   Sectional drawing of a thread solder.   The front view of the thread solder feeder which pre-processes thread solder.   Sectional drawing of the pinch | feeding roller of the form of (a) of FIG.   FIG. 2 is a front view of a solder feeding front end portion according to the first embodiment and a cross-sectional view of a soldering portion.   FIG. 6 is a front view, a top view, and a side view of a solder feeding tip portion according to the second embodiment.   FIG. 6 is a front view, a top view, and a side view of a solder feed tip according to a third embodiment.   FIG. 6 is a front view, a top view, and a side view of a solder feed tip according to a fourth embodiment.   FIG. 6 is a front view, a top view, and a side view of a solder feeding tip portion according to a fifth embodiment.   FIG. 10 is a front view, a top view, and a side view of a solder feed tip according to a sixth embodiment.   FIG. 10 is a front view, a top view, and a side view of a solder feeding tip portion according to a seventh embodiment.

The pinch roller of the yarn solder feeder is responsible for pre-processing to open the flux, and the solder alloy thin film is left, and finishing is performed at the tip of the feed guide.
The finishing force for flux opening is reduced or minimized by pre-processing. Therefore, the thin film of the solder alloy is opened by various slight processing forces such as cutting using the feed force of the sandwich feed roller or heating.

FIG. 6 shows a yarn solder feeder for performing preliminary processing corresponding to the cross section of FIGS. 1) to 4), wherein 1 yarn solder is composed of 2 solder alloys and 3 fluxes. Yes. The yarn solder 1 is supplied from the yarn solder reel 4 to the base 5 of the yarn solder supply machine 6 through the inlet guide 6 of FIG. While being preliminarily processed by the rollers and the guide rollers of 8, they are nipped and fed to the feed guide of 9.
The pre-processed yarn solder has the form of the pre-processed diagrams of FIGS. 2a, 3a, 4a, and 5a, respectively.
In FIG. 7, 10 preliminary processing rollers and 11 guide rollers that form the form (a) of FIG. 1 are used to feed the paper while forming the cross section of FIG. 2a. These pinch rollers are assembled to the base of the solder wire feeder 5a and are driven by the motor 5b.
In FIG. 8, the pre-finished solder is subjected to a laparoscopic finish in the form of a) in FIG. The finished thread solder has a cross section as shown in FIG. 2b), and is soldered by applying a heat source to the thread solder and 14 pins of the 13 substrates and 15 substrate land portions.

  In FIG. 8, the pre-processed yarn solder that has been nipped and fed in the embodiment of FIG. 1 a) passes through 9 feed guides, and is attached to 16 holders-A at the tip of 12 feed guides. ) Is finished with 17 rotary blades suitable for the form example, and the flux is opened. The rotary blade performs the processing by the rotation by the feeding force at the time of pinching and feeding, and the thread solder subjected to the laparotomy has a cross section of FIG.

In FIG. 9, the pre-processed yarn solder that has been nipped and fed in the embodiment of FIG. 1 b) passes through 9 feed guides and is attached to 18 holders-B at 12 feed guide tips. Finishing is performed with 19 cutting blades corresponding to the embodiment of (a), and the flux is opened.
The cutting blade performs processing by pressing with a feed force when pinching and feeding, and the thread solder subjected to the laparotomy has a cross section of FIG. 2b.

  In FIG. 10, the pre-processed yarn solder that has been nipped and fed in the embodiment of FIG. 1 b) is fed through 9 feed guides and fed by 21 wires attached to 20 holders-C at the tip of 12 feed guides. By the 23 hot wires heated by the 22 heaters, the solder alloy at the flux unachieved part in the preliminary processing is melted, and the flux is opened.

  In FIG. 11, the preliminarily processed yarn solder that has been nipped and fed in the embodiment of FIG. 1 b) passes through 9 feed guides, and at the 12 feed guide tips, 25 hot air blown from 24 nozzles is spared. The solder alloy at the flux unachieved part is melted and the flux is opened.

  In FIG. 12, the pre-processed yarn solder that has been nipped and fed in the embodiment of FIG. 1) passes through 9 feed guides, and at the tip of 12 feed guides, 27 light beams are emitted from 26 barrels and conduits. By the beam and the laser, the solder alloy at the flux unachieved part in the pre-processing is melted, and the flux is opened.

  In FIG. 13, the pre-processed yarn solder that has been fed and fed in the embodiment shown in FIG. 1) passes through 9 feed guides and is fed from 28 ultrafine fibers at 12 feed guide tips. The solder melts the solder alloy that has not reached the flux in the preliminary processing, and the flux is opened.

  FIG. 14 shows the pre-processed yarn solder that has been nipped and fed in the embodiment of FIG. 1) through the 9 feed guides, 12 feed guide tips, and 30 induction coils by induction heating and high frequency heating. The solder alloy at the flux unachieved part in the pre-processing is melted and the flux is opened.

DESCRIPTION OF SYMBOLS 1 Yarn solder 2 Solder alloy 3 Flux 4 Yarn solder reel 5a Base 5b Motor 6 Entrance guide 7 Preliminary processing roller 8 Guide roller 9 Feeding guide 10 Preliminary processing roller 11 of the form of FIG. Guide roller 12 Feed guide tip 13 Substrate 14 Pin 15 Substrate land 16 Holder-A
17 Rotating blade 18 Holder B
19 Cutting blade 20 Holder-C
21 Electric wire 22 Heater
23 Hot wire 24 Nozzle 25 Hot air 26 Lens tube, conduit 27 Light beam, laser 28 Extra fine fiber
29 Laser 30 Electromagnetic coil

Claims (2)

  In a feeding device for the purpose of preventing solder scattering of flux-cored yarn solder, a solder alloy thin film generation process having a thickness of 0.01 mm to 0.3 mm is performed so as not to reach the flux opening along the yarn solder line. The processed yarn solder sent out through the solder guide by either pinching with the pinch feeding roller, or reprocessing the pinned solder with the pinching roller, or pinching feed, A device that opens at the guide exit.   Soldering by laparotomy according to claim 1.

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