JP4566857B2 - Soldering iron tip and manufacturing method thereof - Google Patents

Description

  The present invention relates to a soldering iron tip and a method for manufacturing the same, and more particularly to a durable iron tip for lead-free solder and a method for manufacturing the same.

  A soldering iron tip is used to join an object by melting the solder when soldering. The tip is formed of a copper material having excellent thermal conductivity. Conventionally, lead-tin alloys have been generally used as solder. Since the tip made of a copper material is easily corroded by tin which is a solder component, a tip that is iron-coated to the contact portion with the solder to improve corrosion resistance is generally used. . Since the solder component of lead functions as a protective film for iron plating, the durability of the tip is further improved.

  Recently, however, the use of lead has been restricted due to pollution problems, and lead-free solder containing no lead has been used instead of the conventional lead-tin solder. Lead-tin solder contains 40-60% lead and has a melting point of around 170-180 ° C, while lead-free solder contains around 95% tin and has a melting point of around 210-230 ° C. Is higher than lead-tin solder. Therefore, in the case of lead-free solder, the tip temperature is significantly higher than that of lead-tin solder, the iron plating layer of the tip is consumed quickly, and the life of the tip is extremely short. It tends to be shorter.

  On the other hand, along with the miniaturization and miniaturization of electronic components and the like to be soldered, or the automation of soldering work, there are increasing demands for speeding up the soldering work and extending the life of the tip. In addition, with the automation of soldering, the shape of the solder supply portion of the tip, that is, the portion for automatically supplying thread solder or the like is complicated and downsized, and durability is an urgent issue.

  Therefore, various tips with improved durability against lead-free solder have been proposed. For example, in Patent Document 1, an intermediate layer made of a material having good adhesion to both the underlayer and the surface layer is a base layer made of a highly corrosion-resistant amorphous metal and a surface layer having good wettability with solder at the tip portion. There has been proposed a soldering iron tip that is laminated through the two. By providing amorphous metal as an underlayer at the tip of the iron tip, corrosion of the tip is reduced and durability is improved. Patent Document 2 proposes a soldering iron provided with a metal film having good solder wettability by a technique such as plating or vapor deposition on the tip of a soldering iron tip made of ceramic, and the tip of the iron is consumed by a ceramic iron tip. Has been reduced.

  Patent Document 3 proposes a soldering iron tip in which an iron-nickel alloy plating is applied to the surface of a copper or copper alloy base, improving the wettability and durability of the soldering iron. I am letting.

  Moreover, in patent document 4, the part which contacts at least solder | pewter tip part with an iron-silicon alloy is comprised, and the wettability and durability with respect to solder are improved like the iron tip of patent document 3. Proposed.

  As the tip, as proposed in Patent Documents 1 to 4, a tip in which the tip portion of the tip is formed in a conical shape or a column shape is frequently used. However, in a tip used for automatic supply of thread solder or the like, an automatic supply portion of solder takes various forms by a soldering device, and a deep groove is provided at the tip as shown in FIGS. 10 and 11, for example. Some have a wedge-shaped groove. A tip 1 shown in FIG. 10A has a flat tip, and a deep groove 1A is formed by deeply cutting the center in the width direction toward the base end, and solder is supplied to this portion. A tip 2 shown in FIG. 11 (a) has a flat tip, and a wedge-shaped wedge-shaped groove 2A is formed at the center thereof, and solder is supplied to this portion. The iron plating layers 1B and 2B are also applied to the contact portions of the tips 1 and 2 with the solder, that is, the deep groove 1A and the wedge-shaped groove 2A, thereby enhancing the durability of the tips 1 and 2. As shown in FIG. 12, the tip 3 has a tip portion 3B in which a wedge-shaped groove 3A is formed, and a tip body 3C to which the tip portion 3B is joined. The tip 3B is formed of a metal different from the tip main body 3B, which is durable against solder such as iron, and is joined to the tip main body 3B.

JP 07-112272 A JP 07-144271 A JP 2000-317629 A JP2004-017060

However, the conventional soldering iron tip is plated with iron or the like that is durable against solder at least at the contact point with the solder. The more complicated the shape, the more difficult it is to perform plating with a uniform film thickness. In particular, in the plating process, there is a problem that it is difficult to form a plating film in a deep groove or an acute angle portion of the groove.

  For this reason, for example, in the case of the tip 1 shown in FIG. 10, since the portion in contact with the solder is a deep groove 1A as shown in FIG. 10B, the plating in the deep groove 1A is not performed. There has been a problem that the thickness of the iron plating layer 1B of the deep groove 1A, which is most required to have durability against solder, is extremely thinner than other portions and the life is extremely short. In the case of the tip 2 shown in FIG. 11, the thickness of the plating film 2B becomes thinner as the bottom of the wedge-shaped groove 2A becomes sharper as shown in FIG. There was a problem that the lifetime was extremely short as in the first case. FIG. 10C is a diagram showing a state in which the dimensions are finished after the plating process.

  Furthermore, in the case of the tip 3 shown in FIG. 12, the tip 3B that contacts the solder of the tip 3 is formed of iron that is strong against the solder. The rate was poor and the soldering operation was an obstacle to increasing the throughput.

  The present invention has been made to solve the above-mentioned problems, and can increase durability and achieve a long life, and can increase the throughput of soldering work without sacrificing heat transfer efficiency. An object of the present invention is to provide a soldering tip and a method for manufacturing the same.

The tip according to claim 1 of the present invention is a soldering iron tip having a flat surface groove that comes into contact with the solder, and an expansion groove in which only the bottom is curved with a size obtained by expanding the groove. soldering tip body and said extension and base layer formed as a plating layer of a metal on the wall of the groove, filling the metal upper Symbol metal and weldable metal only in the extended groove is filled with the overlay clad with A groove member that is welded to the base layer as a part and integrated with the tip body and in which the groove is formed in the filling metal part, and the groove member that is composed of the filling metal part, It has corrosion resistance against the solder.

The tip according to claim 2 of the present invention is characterized in that, in the invention according to claim 1, the metal of the groove member and the metal of the underlayer are both iron. .

According to a third aspect of the present invention, there is provided a method of manufacturing a tip according to the third aspect of the present invention, wherein the tip body is prepared in a method for manufacturing a tip for a soldering iron having a groove having a flat surface in contact with the solder. A step of forming, on the tip body, an expansion groove having a size that expands the groove, by curving only the bottom, and a base layer made of a metal plating layer on the wall surface of the expansion groove. forming, a metal having corrosion resistance against the metal and weldable at the solder, said through an underlying layer to form a filler metal portion was filled with the overlay clad only in the extended groove the extension groove And the step of welding the filled metal portion and the step of forming the groove in the groove member made of the filled metal portion.

According to a fourth aspect of the present invention, there is provided the method for manufacturing a tip according to the third aspect of the present invention, wherein the extension groove is filled with the metal and then the coating layer made of the same metal as the underlayer. Is provided on the surface of the tip body.

Further, in the method for manufacturing a tip according to claim 5 of the present invention, in the invention according to claim 3 or claim 4 , iron is used as the metal of the groove member and the metal of the base layer. It is characterized by using.

According to the present invention, the groove corresponding to the groove formed of a flat surface in contact with the solder of the tip is provided with an extended groove that is extended and curved only at the bottom, and the wall surface of the extended groove is formed of a plating layer. A flat surface that forms an underlayer , forms a groove member by welding a metal-filled portion that is corrosion-resistant to the solder only in the expansion groove through the underlayer, and builds up as a groove member. As a result of forming the groove made of the soldering iron, it is possible to increase the durability against the solder and achieve a long life, and at the same time to increase the throughput of the soldering operation without sacrificing the heat transfer efficiency and its tip A manufacturing method can be provided.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS. FIG. 1 is a view showing the main part of an embodiment of the tip of the present invention, (a) is a perspective view thereof, (b) is a sectional view thereof, and FIGS. 2 to 7 are shown in FIG. FIG. 8 is a view showing the main part of another embodiment of the tip of the present invention, (a) is a perspective view thereof, and (b) is a sectional view thereof. FIGS. 9A to 9C are perspective views showing the main part of the manufacturing method of the tip shown in FIG. 8 in the order of steps.

First Embodiment A tip 10 according to the present embodiment has a deep groove 10A at the tip as shown in FIGS. 1A and 1B, for example, and can receive solder such as thread solder in the deep groove 10A. It is configured as follows. Therefore, since the solder melts in the deep groove 10A during soldering and the molten solder contacts the side wall of the deep groove 10A and corrodes the wall surface of the deep groove 10A, the deep groove 10A has the following special measures.

  That is, the tip 10 of the present embodiment is a groove for forming a tip body 11 made of a copper material and a deep groove 10A of the tip 10 as shown in FIGS. And a member 12. The groove member 12 is made of, for example, iron, and is joined to the tip body 11. For example, as shown in FIG. 1A, the tip body 11 includes a pair of first side surfaces 11A and 11A facing each other, a pair of second side surfaces 11B and 11B facing each other in parallel, 1 and a rectangular flat surface 11C formed at the tips of the second side surfaces 11A and 11B. Each of the first and second side surfaces 11A may be formed as a tapered surface as needed, or may be formed as side surfaces parallel to each other. The first side surface is a tapered surface, and the second side surface. May be parallel side surfaces.

  As shown in FIG. 1A, an extension groove 11D having a size obtained by expanding the deep groove 10A is formed at the tip of the tip body 11 following the deep groove 10A of the groove member 12. The groove member 12 is joined in the extended groove 11D. The extension groove 11D has a groove width that is considerably wider than that of the deep groove 10A and has a curved bottom, so that the wall surface of the extension groove 11D can be easily plated. A plating layer having a uniform thickness can be formed.

  The tip body 11 is made of, for example, a copper material, and the groove member 12 is made of, for example, a material made of iron. Copper and iron are metals that are difficult to weld together. Therefore, in this embodiment, in order to join the groove member 12 made of iron to the tip body 11 made of copper, for example, as shown in FIGS. A base layer 11E made of an iron plating layer (shown by a thick solid line in (a)) is formed on the wall surface of the 11 expansion grooves 11D. The groove member 12 is firmly welded and joined to the extended groove 11D via the base layer 11E made of an iron plating layer, and is integrated with the tip body 11. And as shown in (b) of the figure, the iron plating layer 10B is formed in the surface of the tip main body 11 and the member 12 for grooves.

  The deep groove 10A of the tip 10 formed on the groove member 12 has a groove width much narrower than the expansion groove 11D formed on the tip body 11, and the groove member 12 between the two 10A and 11D. The thickness of is formed thick. Therefore, since the groove member 12 is much thicker than the conventional iron plating layer, the durability is greatly improved and the life is remarkably increased against the erosion caused by the molten solder. Further, since the groove member 12 is bonded through the base layer 11E made of the same metal (iron) as the groove member 12, it is firmly bonded to the tip body 11. In the present embodiment, iron has been described as an example of the material of the groove member 12. However, the groove member 12 is a metal that is durable to solder, can be welded to the base layer 11E, and has solder wettability. If there is, it is not limited to iron. Further, the groove member 12 may be formed of a metal different from the base layer 11E as long as it can be welded to the base layer 11E.

  Next, an embodiment of the iron tip manufacturing method of the present invention will be described with reference to FIGS.

  First, as shown in FIGS. 2A and 2B, for example, a round bar-shaped copper material is formed by cutting or the like to form a tip material 11 ′ having a shape close to the tip 10. A rectangular groove 11'D corresponding to a deep groove is also formed in the tip material 11 '.

  Next, as shown in FIGS. 3A and 3B, the groove 11′D of the tip material 11 ′ shown in FIG. 2 is expanded by cutting or the like to process the expanded groove 11D. The tip body 11 is produced. When processing the expansion groove 11D, the bottom is formed as a curved surface. By forming the bottom portion as a curved surface, a plating layer having a substantially uniform film thickness can be formed on the entire wall surface of the extension groove 11D including the bottom surface.

  After producing the tip body 11, as shown in FIGS. 4 (a) and 4 (b), the tip body 11 is plated by a conventionally known method, and the iron plating layer is used as the base layer 11E. Form. Since the extended groove 11D is formed to have a considerably wide groove width and the bottom is curved, the entire wall surface of the extended groove 11D is easily plated. Therefore, as shown in FIG. A substantially uniform underlayer 11E is formed on all wall surfaces.

  Thereafter, as shown in FIGS. 5 (a) and 5 (b), using iron wire or the like, the iron is built up in the expansion groove 11D of the tip body 11 in the manner of welding, and the groove is used. The filling metal part M that is the basis of the member 12 is formed. At this time, since the base layer 11E made of the same metal as the filling metal part M is formed on the wall surface of the extension groove 11D, the metal of the filling metal part M and the base layer 11E are welded to each other and firmly bonded. . In FIG. 9A, the base layer 11E is indicated by a thick solid line.

  The filling metal portion M is formed in the extended groove 11D of the tip body 11, and the metal swelled to the outside from the extended groove 11D is formed and processed, and the side surfaces 11A and 11B of the tip body 10 as shown in FIG. And the end surface 11C is finished flat. Then, the iron body 11 is subjected to iron plating to form a rough plating layer 10'B on the surface of the iron body 11 as shown in FIG. Since the metal is more easily attached to the corner portion than other flat surfaces by the plating process, the rough plating layer 10'B at the corner portion is raised as shown in FIG.

  Thereafter, a deep groove 10A is formed by cutting from the center in the width direction of the front end surface of the filling metal portion M toward the base end side of the tip body 11 by cutting or the like. At this time, the non-uniform rough plating layer 10'B is also adjusted in size by polishing or the like, and finally finished as the tip 10, and the iron shown in FIGS. 1 (a) and 1 (b). A finished product as the tip 10 including the tip body 11 and the groove member 12 is obtained.

  As described above, according to the present embodiment, the step of preparing the tip body 11, the step of forming the expansion groove 11 </ b> D in the tip body 11, and a metal (for example, a material having corrosion resistance to solder) The process includes the step of filling the expansion groove 11D with iron and joining the filling metal portion M to the extension groove 11D and the step of forming the deep groove 10A in the filling metal portion M joined to the extension groove 11D. A tip body 11 having an extension groove 11D having a size obtained by expanding the deep groove 10A, and a groove joined to the extension groove 11D of the tip body 11 to be integrated with the tip body 11 and formed with the deep groove 10A. The tip 10 including the working member 12 can be easily and reliably manufactured at low cost.

  Further, in the tip 10 of the present embodiment, the deep groove 10A that is a portion that comes into contact with the solder is formed by the groove member 12, and the portion that is thinned by soldering is thick. In particular, the effect of prolonging the life when using lead-free solder is noticeable. In addition, since the periphery of the groove member 12 is surrounded by the copper material of the tip main body 11, the thermal conductivity is good and the throughput of the soldering operation can be increased without sacrificing the soldering speed. Alternatively, the wedge-shaped groove may be formed after joining the groove members.

  In addition, since the base layer 11E is provided on the wall surface of the extension groove 11D of the tip body 11 to enhance the bonding property between the groove member 12 and the extension groove 11D, the groove member 12 is firmly attached to the tip body 11. Can be integrated. Furthermore, since the groove member 12 is formed of iron, it is possible to achieve a long life when lead-free solder is used.

Second Embodiment In the first embodiment, the tip 10 having a groove such as the deep groove 10A has been described. However, the present invention is also applicable to a tip having a wedge-shaped groove shown in FIG. 8, for example. Can do. Since the present embodiment is configured according to the first embodiment except for the portion related to the wedge-shaped groove, the characteristic portion of the present embodiment will be described.

  That is, the tip 20 of the present embodiment includes, for example, a tip body 21 and an extended groove 21A formed at the tip of the tip body 21 as shown in FIGS. A groove-shaped member 22 joined to the groove member 22, and a wedge-shaped groove 20 </ b> A is formed at the tip of the groove-shaped member 22. An iron plating layer 20B is formed on the surface of the tip 20 as shown in FIG.

  The extended groove 21A has a size obtained by expanding the wedge-shaped groove 20A as shown in FIGS. 8 (a) and 8 (b). An iron plating layer 21B (shown by a thick line in FIG. 5B) is formed on the entire wall surface of the extension groove 21A, and the groove member 22 is joined via the iron plating layer 21B. As in the first embodiment, the groove member 22 itself becomes a consumable portion due to solder, and thus the life is significantly longer than in the conventional case.

  FIGS. 9A to 9C show the main part of the manufacturing process of the tip shown in FIG. First, for example, a copper material is formed by cutting or the like to form a tip material (not shown) having a shape close to the tip 20, and as shown in FIG. A tip body 21 having an expanded groove 21A having a size obtained by expanding the wedge-shaped groove is formed. The extension groove 21A has a curved wall as shown in FIG.

  After the tip body 21 is produced, the tip body 21 is plated to form a base layer 21B made of an iron plating layer on the wall surface of the extension groove 21A. Since the bottom of the extended groove 21A is curved, the entire wall surface of the extended groove 11D is easily plated, so that a substantially uniform base layer 21B is formed on the entire wall surface of the extended groove 11D. The underlayer 21B is indicated by a thick solid line in FIGS. 9B and 9C.

  Thereafter, as in the first embodiment, iron is built up in the expansion groove 21 </ b> A of the tip body 21 in the manner of welding using an iron wire or the like, and becomes a base of the groove member 22. After the filling metal portion M is formed, the metal bulging to the outside from the expansion groove 21A is removed, and the side surface and the front end surface of the tip body 20 are finished flat as shown in FIG. 9B. Then, the iron body 21 is subjected to iron plating.

  Thereafter, a wedge-shaped groove 20A is formed by making a cut from the center in the width direction of the corner portion of the distal end surface of the filling metal portion M toward the proximal end side of the tip body 21. Thereafter, the size of the tip 20 is adjusted by surface polishing or the like, and a final finishing process is performed as the tip 20, and the tip body 21 and the groove member 22 shown in FIG. A finished product as the tip 20 is obtained.

  As described above, the same effects as those of the first embodiment can be expected in this embodiment.

  In the first and second embodiments, the tip having a groove at the portion where the solder contacts is described as an example. However, the present invention can also be applied to a tip having a conical tip. it can. In this case, for example, a rod-shaped member made of iron is joined to the tip of a rod-shaped copper material via a base layer or without a base layer, and is formed into a conical shape including the rod-shaped member and the tip of the copper material. After processing, a desired tip can be obtained by forming a plated layer on the tip portion with iron or an iron alloy.

  In addition, this invention is not restrict | limited at all to said each embodiment, What changed the design of the component of this invention suitably is included by this invention. For example, in each of the above embodiments, the groove member and the underlying layer have been described using iron, but other than iron, for example, an iron alloy or other metal can be used as appropriate. Moreover, depending on the metal of the tip main body and the groove member, both of them may be directly bonded without using an underlayer.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for the tip of a soldering apparatus used for soldering electronic components and the like and a manufacturing method thereof.

It is a figure which shows the principal part of one Embodiment of the iron tip of this invention, (a) is the perspective view, (b) is the sectional drawing. (A), (b) is a figure which shows 1 process of one Embodiment of the manufacturing method of the tip shown in FIG. 1, respectively, (a) is a perspective view of the tip in the process, (b) is the figure FIG. (A), (b) is a figure which shows the tip in one process of one Embodiment of the manufacturing method of the tip shown in FIG. 1, respectively, (a) is a perspective view of the tip in the process, ( b) is a sectional view thereof. (A), (b) is a figure which shows the tip in one process of one Embodiment of the manufacturing method of the tip shown in FIG. 1, respectively, (a) is a perspective view of the tip in the process, ( b) is a sectional view thereof. (A), (b) is a figure which shows the tip in one process of one Embodiment of the manufacturing method of the tip shown in FIG. 1, respectively, (a) is a perspective view of the tip in the process, ( b) is a sectional view thereof. It is a perspective view which shows the tip in 1 process of one Embodiment of the manufacturing method of the tip shown in FIG. It is sectional drawing which shows the tip in 1 process of one Embodiment of the manufacturing method of the tip shown in FIG. It is a figure which shows the principal part of other embodiment of the tip of this invention, (a) is the perspective view, (b) is the sectional drawing. (A)-(c) is a perspective view which shows the principal part of the manufacturing method of the tip shown in FIG. 8 in order of a process, respectively. (A)-(c) is a figure which shows the principal part of the conventional tip, respectively, (a) is the perspective view, (b) is the principal which shows the state which gave the iron plating layer to the surface of the tip Sectional drawing of a part, (c) is sectional drawing which shows the tip shown to (a). (A), (b) is a figure which shows the principal part of the other conventional tip, respectively, (a) is the perspective view, (b) is sectional drawing equivalent to (b) of FIG. It is a perspective view which shows the principal part of the tip of the other conventional example.

Explanation of symbols

10, 20 Tip 10A Deep groove (groove)
20A wedge-shaped groove (groove)
11, 21 Tip body 11D, 21A Expansion groove 11E, 21B Underlayer 12, 22 Groove member M Filling metal part

Claims (5)

In a soldering iron tip having a groove having a flat surface in contact with the solder, a tip body having an extension groove whose bottom is curved with a size obtained by expanding the groove, and a wall surface of the extension groove. an underlying layer formed as a plating layer of a metal, said tip being welded to the underlying layer as filler metal section above Symbol metal and weldable metal only to the extension groove is filled with padding welding A groove member integrated with a main body and having the groove formed in the filling metal portion, and the groove member formed of the filling metal portion has corrosion resistance to the solder. Ahead. 2. The tip according to claim 1, wherein the metal of the groove member and the metal of the base layer are both iron. In a method for manufacturing a soldering iron tip having a groove having a flat surface that comes into contact with solder, a step of preparing the iron tip body, and a size obtained by expanding the groove on the iron body. A step of forming an extension groove by curving only its bottom, a step of forming a base layer made of a metal plating layer on the wall surface of the extension groove, and a metal that can be welded to the metal and has corrosion resistance to the solder and a step of welding the filler metal section in the expanded and filled with the overlay clad only in the trench to form a filler metal section the extension groove through the underlying layer, grooves composed of the filler metal section And a step of forming the groove in the member. 4. The tip according to claim 3, further comprising a step of forming a coating layer made of the same metal as the underlayer on the surface of the tip body after filling the expansion groove with the metal. Manufacturing method. The iron manufacturing method according to claim 3 or 4 , wherein iron is used as the metal of the groove member and the metal of the base layer.

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