WO2003055639A1

WO2003055639A1 - Slotting device for resin flux cored solder

Info

Publication number: WO2003055639A1
Application number: PCT/JP2002/013418
Authority: WO
Inventors: Tomoaki Fusamura
Original assignee: Hakko Corporation
Priority date: 2001-12-27
Filing date: 2002-12-24
Publication date: 2003-07-10
Also published as: JP2003200290A; JP4035321B2; AU2002367128A1; CN1500026A; CN1270867C

Abstract

A slotting device for resin flux cored solder capable of slotting a resin flux cored solder, comprising a disk-like slotting blade for slotting the solder, a drive means for rotatingly driving the slotting blade, a guide roller having V-shaped guide grooves on a circumference and positioning the solder when slotting the solder, and a feed nozzle for leading the solder from a reel stand to the guide roll, wherein the feeding direction line of the solder supplied from the solder outlet of the feed nozzle is equal to an arc tangential line formed by the center line of the solder in the state of the solder positioned along the guide groove, a guide start point on the arc from which the solder is guided completely is positioned on the upstream side of a cutting point which is the intersection of the arc with a straight line connecting the rotating center of the slotting blade to the rotating center of the guide roller, the center angle of the arc between the guide start point and the cutting point is an acute angle of 5° or more, and the rotating center of the slotting blade is positioned on the opposite side of the rotating center of the guide roller with respect to the feeding direction line.

Description

Description Jani threaded grooving device Technical field

TECHNICAL FIELD The present invention relates to an apparatus for grooving thread-containing solder (hereinafter simply referred to as thread solder) used for manual soldering. Background art

When soldering with crimped wire solder that has a flux layer at the axis of the wire solder, the heat of the tip causes the flux with a lower melting point than the solder to vaporize, expand and explode, and the flux and solder It may splatter on surrounding electronic boards and cause troubles in electronic equipment.

In particular, since the so-called lead-free solder, which has a low lead content, has a high melting point, the difference from the melting point of the flux is large, and the frequency of occurrence of this trouble is increasing.

In order to prevent this, just before soldering, grooves are formed on the surface of the thread solder to reach the internal flux layer, and vaporized flux is discharged from these grooves to prevent scattering of solder etc. Techniques for doing so are known. In the conventional technology, the thread solder is guided to a roller having a V-shaped or U-shaped groove, and a thread is formed by a rotationally driven grooving blade. No. 57, published in Japanese Utility Model Publication No. 7-196664.

However, in the conventional example, each of the V-shaped groove opening one-line type and the U-shaped groove roller type has advantages and disadvantages, and the structure is relatively complicated to solve the problem.

The V-shaped groove roller type allows positioning regardless of the diameter of the thread solder, but allows the thread solder to escape easily from the groove. A special roller for grooving after fitting on And other mechanisms.

The u-shaped grooved roller type can completely prevent the thread solder from escaping because it completely fits into the groove, but it is difficult to apply it to a thread solder with a diameter different from the groove width. Was also needed.

In addition, when initially setting the thread solder in the device, it was necessary to route the thread solder to the exit of the device or the grooving blade position in advance. In particular, in the case of a relatively complicated device as described above, there was a problem that the operation of the device was complicated.

In view of such circumstances, the present invention solves the problem of escape of the thread solder from the groove with a simple structure without using a special mechanism while adopting the V-shaped grooved roller type, It is intended to provide an apparatus for facilitating the initial setting. Disclosure of the invention

The grooved device for grooved thread solder of the present invention comprises: a disk-shaped grooving blade for grooving thread solder; a driving means for rotating and driving the grooving blade; A guide roller that has a guide groove and positions it during groove processing on the thread solder, and a supply nozzle that guides the thread solder from a reel base or the like to the guide roller, wherein the thread solder extends along the guide groove. The arc formed by the center line of the thread solder in the set state is referred to as a guide arc, and the intersection of the straight line connecting the rotation center of the grooving blade and the rotation center of the guide roller with the guide arc is referred to as a cutting point. The guide starting point is a point on the guide arc at which the supply direction of the thread solder supplied from the thread solder discharge port of the supply nozzle is substantially equal to the tangent of the guide arc and the thread solder begins to be completely guided. But the above cutting point Is located upstream in the feed direction of the thread solder, the offset angle that is the center angle of the guide arc from the guide start point to the cutting point is an acute angle of 5 degrees or more, and the rotation center of the grooving blade is However, it is characterized in that it is arranged on the opposite side to the rotation center of the guide roller with respect to the supply direction line.

In this device, the V-shaped groove roller is used. Positioning can be performed regardless of the diameter of the thread solder, and accurate processing can be performed.In addition, by setting the offset angle to 5 degrees or more, the thread solder can be adapted to the V-shaped groove before grooving. Grooving can be reliably performed on the thread solder in the guide state, and it is possible to prevent the thread solder from escaping from the grooving blade, which is a bad effect when using a V-shaped groove.

At this time, since the supply direction line of the thread solder is substantially equal to the tangent line of the guide arc, the thread solder can be guided to the V-shaped groove with a simple structure without providing a holding roller or the like.

Furthermore, since the center of rotation of the grooving blade is located on the opposite side of the rotation center of the guide roller with respect to the supply direction line, the insertion angle of the thread solder described later becomes an acute angle, and the supply nozzle is initially set. It is possible to naturally feed the solder from the V-shaped groove to the cutting point simply by feeding the solder from the entrance of the wire.

In the apparatus for grooving thread-filled solder according to the present invention, when an arc including the cutting point concentric with the rotation center of the grooving blade is referred to as a cutting arc, an arc at an intersection of the cutting arc and the supply direction line is defined. The insertion angle between the tangent to the cutting arc and the supply direction line may be 40 degrees or less.

In this configuration, since the insertion angle is 40 degrees or less, the initial set can be performed more reliably and smoothly. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a partially cutaway perspective view of an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main mechanism of the device according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 is an explanatory diagram at the time of initial setting of the device according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an apparatus for grooving thread-containing solder according to the present invention will be specifically described. FIG. 1 shows a partially cutaway perspective view of the grooving device 1. The main mechanism of grooving device 1 is Consists of three axes.

The first shaft at the bottom is the rotation shaft of the drive gear 4. The drive gear 4 is a turntable having an externally toothed wheel fitted and fixed to a drive gear rotation shaft 41 protruding from the case 2. The drive gear rotation shaft 41 is connected to the rotation shaft of the drive motor 8 housed in the case 2.

The second shaft in the middle is the rotation shaft of the grooving blade 3. The grooving blade 3 is a disk-shaped rotary cutting blade for performing groove processing on the thread solder 10, and is fitted and fixed to a grooving blade rotating shaft 32 protruding from the case 2.

A driven gear 33 is also fitted and fixed to the grooving blade rotary shaft 32. The driven gear 33 is a driven gear engaged with the driving gear 4. Therefore, the grooving blade 3 and the driven gear 33 rotate coaxially and at the same rotation speed.

The upper third axis is the rotation axis of the guide roller 5. The guide roller 5 serves as a reaction force receiving surface when processing the groove in the thread solder 10 and performs processing positioning. The guide roller 5 is rotatably supported by a guide roller rotating shaft 52 protruding from the case 2. The guide roller 5 rotates freely, and the driving force from the driving motor 8 is not directly transmitted.

A V-shaped groove 51 is provided on the outer peripheral portion of the guide roller 5. The V-shaped groove 51 directly supports the thread solder 10 when the groove is bent, and supports the thread solder 10 on both slopes formed in the V-shape. (See Figure 3).

The supply nozzle 6 guides the thread solder 10 from a solder reel (not shown) to the guide roller 5, and is fixed to the case 2 via the bracket 63.

On the side surface of the case 2, a switch 9 for switching the operation of the drive motor 8 between ON and OFF is arranged.

FIG. 2 is an explanatory diagram showing a detailed positional relationship of a main mechanism of the grooving device 1.

The supply nozzle 6 guides the thread solder 10 in the direction of the guide roller 5, and the direction is indicated by a supply direction line L. In Figure 2, the solder is sent from left to right. On the solder inlet side of the supply nozzle 6, a frusto-conical supply nozzle inlet 61 is provided. A thread solder outlet 62 is provided on the opposite side of the chisel inlet 61.

The thread solder discharge port 62 is disposed at a distance R 3 from the rotation center C of the guide roller rotation shaft 52. It is desirable that R 3 be as small as possible.

The guide port rotating shaft 52 is provided above the supply direction line L. Then, the thread solder 10 discharged from the thread discharge port 62 is supported by the V-shaped groove 51 of the guide roller 5, and the geometric arc formed in the guided state is formed into the guide arc 1 When defined as 2, the supply direction line L is arranged so as to be tangent to the guide arc 12.

The grooving blade rotation shaft 32 is provided below the supply direction line L. When the rotation center of the grooving blade rotation shaft 32 is defined as D, the straight line C D has an angle a (hereinafter referred to as an offset angle) with respect to the vertical line.

As shown in FIG. 2, the offset angle α is also defined as the center angle of the arc AB on the guide arc 12 (the side on which the thread solder 10 is supported). The guide start point Α which is one end of the arc Α Α is a contact point between the supply direction line L and the guide arc 12, and the supplied thread solder 10 is positioned on the V-shaped groove 51 1 without any gap. This is the starting point. A cutting point B, which is another end of the arc A B, is an intersection of the straight line CD and the guide arc 12, and is a point where the grooving blade 3 cuts deepest into the inside of the thread solder 10.

That is, the arc AB is guided without contact with the slopes on both sides of the V-shaped groove 51 in the section where the thread solder 10 is guided by the V-shaped groove 51, and is upstream of the cutting point B. It is the section on the side.

In the above positional relationship, the offset angle α is arranged to be an acute angle of 5 degrees or more.

FIG. 3 is a main part of the cross-sectional view taken along the line III-III of FIG.

Since this cross section is a cross section passing through the cutting point Β, the thread solder 10 is guided in contact with both side slopes of the V-shaped groove 51 without any gap. Further, the cutting edge 31 of the grooving blade 3 is cut deepest into the inside of the thread solder 10. The wire solder 10 has a double structure with a layer of flux 11 at the center, but the cutting edge 31 is arranged to reach this flux 11 Has been established.

The guide roller rotating shaft 52 is supported by an eccentric bearing (not shown), and the guide roller rotating shaft 52 and the grooving blade rotating shaft according to the diameter of the thread solder 10 or the change of the cutting depth. Fine adjustment of the distance between the shaft and 32 is possible.

In FIG. 3, the guide arc 12 and the cutting arc 13 (described later; see FIG. 4) are indicated by a common straight line passing through the center of the thread solder 10. R 1 indicates the radius of the guide arc 12, and R 2 indicates the radius of the cutting arc 13.

FIG. 4 is an explanatory diagram of the positional relationship at the time of initial setting of the solder wire 10.

The thread solder 10 discharged from the thread solder discharge port 62 passes through the guide start point A along the supply direction line L and strikes the grooving blade 3. In FIG. 4, the abutting point is a cutting arc 13. The cutting arc 13 is a geometric arc centered on the grooving blade rotation center D and passing through the cutting point B. The diameter of the thread solder 10 is about 1 mm, and the cutting edge 3 1 has the thread solder 1 Since the cut is made to the vicinity of the center of 0, the radius of the grooving blade 3 and the radius R 2 of the cutting arc 13 almost coincide. Here, it is assumed that they are equal to each other.

A point E in FIG. 4 is a geometrical contact point where the thread solder 10 abuts the grooving blade 3 and is an intersection of the supply direction line L and the cutting arc 13. The insertion angle 0, which is the included angle between the tangent to the cutting arc 13 at the point E and the supply direction line L, is 40 degrees or less. If the insertion angle 0 is an acute angle, when the grooving blade 3 rotates, the thread solder 10 is automatically caught by the frictional force with the cutting edge 3 1 and wound around the guide roller 5 along the V-shaped groove 51. However, it has been experimentally confirmed that the effect is particularly stable when the temperature is 40 degrees or less.

When the guide roller rotation center C and the grooving blade rotation center D are arranged on both sides of the supply direction line L as shown in FIG. 4, the insertion angle 0 is always an acute angle. The relationship between the offset angle and the insertion angle 0 is as follows.

cos () = (R 1 + R 2-cos (θ)) Ζ (R 1 + R 2) Next, the operation of the grooving device 1 will be described.

First, the tip of the solder wire 10 is inserted into the supply nozzle inlet 61 with the switch 9 in the state of 〇 FF, and is guided to the guide opening 5 through the wire solder outlet 62. At this time, since the supply nozzle inlet 61 has a truncated cone shape, insertion is easy, and even after setting, it can be smoothly guided into the supply nozzle 6 even from a direction deviated from the supply direction L. is there. The thread solder 10 is straightened in the supply nozzle 6 toward the guide roller 5 and strikes the grooving blade 3. At this time, since the distance R3 between the thread solder discharge port 62 and the center of rotation C of the guide port is set to be small, displacement due to bending or dripping of the thread solder 10 hardly occurs.

Subsequently, when the switch 9 is turned ON, the drive motor 8 rotates, and the grooving blade 3 rotates via the drive gear 4 and the driven gear 33. At this time, since the insertion angle 0 is 40 degrees or less, the thread solder 10 is automatically caught by the frictional force with the cutting edge 31, and is wound around the guide roller 5 along the V-shaped groove 51. At the same time, the thread solder 10 is grooved by the grooving blade 3 to reach the flux 11.

The wire solder 10 draws a guide arc 12 along the V-shaped groove 51 from the guide start point A to the cutting point B. In the section of the guide arc 12, the thread solder 10 is guided without gaps by the slopes on both sides of the V-shaped groove 51. Since the offset angle is 5 degrees or more, the thread solder 10 is adapted to the V-shaped groove 51 in this guide section, and the cutting edge B 1 is securely positioned at the cutting point B, so the cutting edge 31 escapes from the thread solder 10 It is possible to stably groove the flux 11.

Thereafter, until the switch 9 is turned OFF, the thread solder 10 is automatically fed by the frictional force between the grooving blade 3 and the thread solder 10, and the grooving is continuously performed.

In the above embodiment, the positional relationship between the top, bottom, left and right is relative, and for example, each rotation axis may be vertical or in any direction.

Further, the target thread solder 10 may be a conventional tin-lead solder or a so-called lead-free solder. The cutting edge 31 of the grooving blade 3 may be a continuous blade or a gear-shaped intermittent blade. The supply direction line L may not be exactly the tangent of the guide arc 12. Thread solder outlet

It is acceptable if the thread solder 10 derived from 6 2 is a substantially tangent line that is naturally on the V-shaped groove 51.

The switch 9 may be led out of the grooving device 1 and used as a switch at hand of an operator, or both of them may be provided.

The driving force from the driving motor 8 may be transmitted to the guide roller 5.

Further, the grooving device 1 can also be applied as a device for simply sending out solder, and the objects for grooving and sending out can be all those of the striatum. Industrial applicability

As is apparent from the above description, in the groove soldering device of the present invention, the supply direction line of the thread solder supplied from the thread solder discharge port of the supply nozzle is equal to the tangent of the guide arc. The guide start point, which is approximately the same point on the guide arc at which the wire solder begins to be completely guided, is upstream of the cutting point in the feed direction of the thread solder, and the guide arc from the guide start point to the cutting point Since the offset angle, which is the central angle, is an acute angle of 5 degrees or more, and the rotation center of the grooving blade is located on the opposite side of the rotation direction of the guide roller with respect to the supply direction line. By using the V-shaped groove opening, positioning can be performed regardless of the diameter of the thread solder, and accurate processing can be performed.In addition, by setting the offset angle to 5 degrees or more, the thread soldering can be performed before grooving. To V Was Soma 馴 the groove, can be reliably grooving the solder wire of the guide state, a Hay harm in the case of using the V-shaped groove, the solder wire can be prevented from escaping from the grooving blade.

At this time, since the supply direction line of the wire solder is substantially equal to the tangent line of the guide arc, the wire solder can be guided to the V-shaped groove with a simple structure without providing a holding port or the like.

In addition, since the center of rotation of the grooving blade is located on the opposite side of the center of rotation of the guide roller with respect to the supply direction line, the insertion angle of the thread solder becomes acute, and the initial setting By simply feeding the thread solder from the entrance of the lined nozzle, the thread solder can be spontaneously fed from the V-shaped groove to the cutout.

Also, in the grooved device for thread solder containing solder of the present invention, if the insertion angle is set to 40 degrees or less, the initial setting can be performed more reliably and smoothly.

Therefore, the grooved device for thread solder in the present invention employs a V-shaped groove opening type, and the problem of escape from the groove of thread solder, which is a problem, can be achieved with a simple structure without using a special mechanism. It has the effect of solving the problem and facilitating the initial setting of the thread solder.

Claims

The scope of the claims

1. A device for forming a groove in a threaded wire solder, comprising a disk-shaped grooving blade for grooving the wire solder, a driving means for rotating and driving the grooving blade, and a V-shape on the circumference. A guide roller that has a guide groove for positioning when grooving into the thread solder, and a supply nozzle that guides the thread solder from the reel base or the like to the guide roller, wherein the thread solder is inserted into the guide groove. When the arc formed by the center line of the thread solder along the line is referred to as a guide arc, and the intersection of the straight line connecting the rotation center of the grooving blade and the rotation center of the guide roller with the guide arc is referred to as a cutting point. The supply start line of the thread solder supplied from the thread solder discharge port of the supply nozzle is substantially equal to the tangent of the guide arc, and the guide start point, which is a point on the guide arc at which the thread solder starts to be completely guided, is The offset angle, which is the center angle of the guide arc from the guide start point to the cutting point, is an acute angle of 5 degrees or more, and the grooving blade is A grooving device for crimped yarn solder, wherein a rotation center is disposed on a side opposite to a rotation center of the guide roller with respect to the supply direction line.

2. When an arc including the cutting point and being concentric with the center of rotation of the grooving blade is referred to as a cutting arc, at the intersection of the cutting arc and the supply direction line, a tangent to the cutting arc and the supply direction line 2. The grooving device for soldering wire according to claim 1, wherein the insertion angle is 40 degrees or less.

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