JP2019195820A - Iron tip for soldering iron - Google Patents

Abstract

To provide an iron tip for a soldering iron, which can extend its life by improving durability against corrosion of solder by a simple structure.SOLUTION: An iron tip for a soldering iron is used to perform a soldering operation by melting linear solder. The iron tip is formed by applying an iron plating layer 8 to a surface of a copper base material 4. A corrosion-resistant member 7 more corrosion-resistant against solder than against copper is attached to a region, which is brought into contact with the linear solder during the soldering operation, of the iron tip.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a soldering iron tip used for soldering an electronic component such as an IC or LSI.

  2. Description of the Related Art Conventionally, a soldering iron tip for melting an electronic component such as an IC or LSI onto a printed wiring board by melting linear solder is known. As shown in Patent Document 1, this type of iron tip is iron-plated on the surface of a copper base material having high thermal conductivity and good solder wettability, and linear solder is applied to the iron tip heated by a heater. By supplying, soldering is performed. On the other hand, copper constituting the base material has good thermal conductivity, and instead of being a material with good solder wettability, it is easy to be eroded by tin which is a component of solder. In general, the surface of the base material is provided with a protective layer made of iron plating (iron-nickel plating) to enhance the corrosion resistance of the tip.

20 and 21 show a state where soldering is performed on a soldering target 22 provided on the printed circuit board 21 using this kind of iron tip.
However, the portion of the conventional tip 20 where the linear solder 27 sent from the solder supply nozzle 26 contacts is subjected to mechanical pressure by the linear solder 27 and, as shown by the arrows in FIG. Since the vortex of the melted solder 28 is generated in the part and the solder is repeatedly contacted, the total contact time with the solder is longer than that of the other part, and the amount of solder to be contacted is also larger than that of the other part. Therefore, as the soldering operation is repeated, as shown in FIG. 21, the iron plating layer 24 covering the base material 23 is gradually peeled off and the iron plating layer 24 is peeled off. Therefore, the solder penetrates into the tip 20 and the base material 23 is eroded by the solder. As a result, the tip 20 may be deteriorated early.

JP 2000-317629 A

  An object of the present invention is to provide a soldering iron tip capable of increasing the durability against erosion of solder and achieving a long life.

  In order to solve the above-mentioned problem, according to the present invention, a soldering iron tip for melting and soldering linear solder, the iron tip is provided with an iron plating layer on the surface of a copper base material The tip of the soldering iron is characterized in that a corrosion-resistant member that is more resistant to soldering than copper is attached to a portion of the soldering tip that contacts the linear solder during soldering. Is provided.

  In the present invention, preferably, the corrosion-resistant member is covered with an iron plating layer. Alternatively, the corrosion resistant member may be exposed from the iron plating layer.

  Moreover, in this invention, it is preferable that the said corrosion-resistant member is formed with the metal raw material in any one of iron, nickel, and aluminum. Alternatively, the corrosion resistant member can be formed of any non-metal of alumina, zirconia, silicon nitride, and aluminum nitride.

  In the present invention, the corrosion-resistant member may be embedded in a recess provided in the base material. Or the said corrosion-resistant member may be inserted in the through-hole which penetrates the said base material.

  According to the tip of the present invention, a corrosion-resistant member that is more resistant to soldering than copper is attached to the portion where the linear solder contacts during soldering, so that durability against solder erosion is improved and long life is achieved. Can be achieved.

It is a top view which shows 1st Embodiment of the tip for soldering irons concerning this invention. It is a partial expanded sectional view which shows the tip tip vicinity vicinity of FIG. It is a figure which shows the manufacturing method of the tip of 1st Embodiment, and is a general | schematic fragmentary enlarged view which shows the state which prepared the base material whose initial shape was a column shape. FIG. 4 is a schematic partial enlarged view showing a state in which through holes are formed in the base material from the state of FIG. 3. FIG. 5 is a schematic partial enlarged view showing a state in which a corrosion-resistant member is inserted into the through hole from the state of FIG. 4. FIG. 6 is a schematic partial enlarged view showing a state in which the base material is processed into a tip shape from the state of FIG. 5. It is a general | schematic fragmentary enlarged view which shows the state which performed the iron plating process to the base material from the state of FIG. It is a figure which shows the manufacturing method of the tip of the modification of 1st Embodiment, and is the schematic part which shows the state which formed the through-hole in the side surface of a base material while processing the base material whose initial shape was a column shape into the tip shape It is an enlarged view. It is a schematic partial enlarged view which shows the state which inserted the corrosion-resistant member in the through-hole from the state of FIG. FIG. 10 is a schematic partially enlarged view showing a state in which the base material is subjected to iron plating treatment from the state of FIG. 9. It is a top view which shows 2nd Embodiment of the tip for soldering irons concerning this invention. FIG. 12 is a partially enlarged view showing the vicinity of the tip of the tip of FIG. 11. It is a figure which shows the manufacturing method of the tip of 2nd Embodiment, and is a general | schematic fragmentary enlarged view which shows the state which hollowed in the side surface of the base material whose initial shape was a column shape. It is a general | schematic fragmentary enlarged view which shows the state which embedded the corrosion-resistant member in the said hollow from the state of FIG. It is a general | schematic fragmentary enlarged view which shows the state which processed the base material into the tip shape from the state of FIG. It is a general | schematic fragmentary enlarged view which shows the state which performed the iron plating process on the base material from the state of FIG. It is a figure which shows the manufacturing method of the tip of the modification of 2nd Embodiment, and is the schematic partial enlarged view which shows the state which formed the hollow in the base material while forming the base material into which the initial shape was a column shape. It is. It is a general | schematic fragmentary enlarged view which shows the state which embedded the corrosion-resistant member in the said hollow from the state of FIG. It is a schematic partial enlarged view which shows the state which performed the iron plating process on the base material from the state of FIG. It is a general | schematic fragmentary expanded sectional view which shows the state which is performing the soldering operation | work using the conventional iron tip. It is a general | schematic fragmentary expanded sectional view which shows the state in which the tip was locally eroded with the solder from the state of FIG.

  A soldering iron tip according to the first embodiment of the present invention will be described with reference to FIGS. The tip 1A is used by being attached to a soldering iron, and melts linear solder and solders the solder target portion with the melted solder. The tip 1A may be attached to a soldering iron used in an automatic soldering apparatus, or may be attached to a manually operated soldering iron.

  As shown in FIG. 1, the tip 1 </ b> A has a cylindrical tip main body 2 and a tip end 3 disposed at the tip of the tip main body 2. The tip body 2 stores heat from a heater built in the soldering iron and transfers the stored heat to the tip 3 of the tip. The tip end portion 3 is a portion that directly contacts the linear solder to melt the linear solder and adheres the molten solder to the soldering target portion. The tip 3 of the tip is gradually tapered toward the front end, and has only a shape in which flat soldering surfaces 5 and 5 are formed on both side surfaces. The front end portions of 5 and 5 are configured as wet surfaces that come into contact with the solder.

  The tip body portion 2 and the tip end portion 3 are formed by covering the surface of a copper base 4 excellent in thermal conductivity with an iron plating layer 8 as a protective film.

  The iron plating layer 8 is for enhancing the corrosion resistance of the tip 1. The thickness of the iron plating layer 8 is formed to an appropriate thickness (for example, 50 μm to 500 μm) according to the material, shape, and the like of the location to be soldered. However, the thinner the thickness, the lower the corrosion resistance of the tip 1, and the thicker the thickness, the lower the thermal conductivity of the tip 1. In addition, on this iron plating layer 8, other plating processes different from iron plating can be performed, for example, other parts except the part used as a wet surface, ie, the outer surface of the tip main-body part 2, are provided. In addition, a hard chromium plating layer is provided on the iron plating layer 8 to make it difficult to adhere solder, and a solder plating layer can be provided on the wet surface in order to improve the wettability of the solder. Their illustration is omitted.

Furthermore, the base material 4 is provided with a corrosion-resistant member 7 that is more resistant to solder than copper at a site where the tip of the linear solder contacts during soldering. The corrosion-resistant member 7 is made of a material having good solder wettability, and the illustrated example is made of iron. The portion where the linear solder contacts is a part of the soldering surface 5 formed at the tip end portion 3, and the soldering surface 5 penetrates a pair of soldering surfaces 5, 5. A circular through-hole 6 is formed, and the corrosion-resistant member 7 formed in a cylindrical shape is inserted into the through-hole 6 closely and closely. Both end surfaces of the corrosion-resistant member 7 are cut along the inclination of the soldering surfaces 5, 5 and form the same surface that is continuous with the base material 4. And the said iron plating layer 8 is distribute | arranged on the surface of the base material 4 and the end surface of the corrosion-resistant member 7 by performing an iron plating process from the corrosion-resistant member 7 top.
The through hole 6 may be oval or polygonal. In this case, the corrosion-resistant member 7 is also formed to have an oval or polygonal cross-sectional shape in accordance with the hole shape.

  The material forming the corrosion-resistant member 7 can be made of a metal material such as nickel or aluminum in addition to the iron, or a non-metal material such as alumina, zirconia, silicon nitride, or aluminum nitride. It is also possible to form.

  As described above, since the tip 1A is provided with the corrosion-resistant member 7 having a higher corrosion resistance to the solder than copper at the portion where the linear solder hits the base material 4, mechanical pressure is exerted by the contact of the linear solder. Even if the total contact time with the solder becomes longer due to the action of the solder or the eddy current of the melted solder or the amount of contact with the solder increases, the erosion of the base material 4 by the solder can be prevented. As a result, it is possible to extend the life by suppressing the deterioration of the tip 1A.

An example of the manufacturing method of the said tip 1A is demonstrated in order using FIGS. 3-7.
First, as shown in FIG. 3, a copper base material 4 having an initial shape which is not formed into a tip shape and having an initial column shape is prepared. Next, as shown in FIGS. 4 and 5, a through hole 6 that penetrates the side surface of the base material 4 in the radial direction is formed at the tip of the base material 4, and An iron corrosion-resistant member 7 having a cylindrical shape is inserted by processing. The corrosion-resistant member 7 has a diameter that substantially matches the diameter of the through hole 6, and is pressed into the through hole 6 by appropriate means such as press-fitting so as to be positioned at the center in the radial direction of the substrate 4.

  Then, as shown in FIG. 6, the base material 4 and the corrosion-resistant member 7 are cut so that the soldering surface 5 is formed at the position where the corrosion-resistant member 7 is attached, and the tip main body 2 and It is processed into a tip shape having a tip end portion 3. And as shown in FIG. 7, the tip 1A which formed the iron plating layer 8 on this base material 4 and the corrosion-resistant member 7 by performing the iron plating process to the said base material 4 from on the said corrosion-resistant member 7 Is manufactured. The tip 1A is further subjected to post-processing such as chromium plating and solder plating from above the iron plating layer 8.

  When the corrosion resistant member 7 is made of metal, the corrosion resistant member 7 can be fixed to the base material 4 by welding. When the corrosion resistant member 7 is non-metallic, the corrosion resistant member 7 is attached to the base material 4. It can also be bonded to the adhesive. Examples of the adhesive include inorganic adhesives such as ceramic bonds and heat conductive cement.

  In the manufacturing method of the tip 1A, the corrosion-resistant member 7 is attached to the base material 4 that is still cylindrical before being processed into the tip shape, and then the base material 4 is processed into the tip shape. However, the corrosion-resistant member 7 can also be attached to the base material 4 after the base material 4 is first processed into a tip shape. This will be described with reference to FIGS.

  First, as shown in FIG. 8, the base material 4 having a cylindrical shape is cut into a die tip shape, and a through hole 6 penetrating the soldering surfaces 5 and 5 is formed. Then, a corrosion-resistant member 7 that is not processed and is cylindrical is inserted into the through-hole 6. At this time, as shown in FIG. 9, the base material 4 has already been processed into a tip shape with a tapered tip, so that the corrosion-resistant member 7 protrudes from the soldering surfaces 5 and 5. Yes. In this state, the iron plating layer 8 is formed on the base material 4 and the corrosion-resistant member protruding from the soldering surface 5 by performing the iron plating process on the surface of the base material 4. Thereafter, in order to form an appropriate shape of the tip, when the protruding surplus portion of the corrosion-resistant member 7 is cut along the inclination of the soldering surfaces 5 and 5, the surface of the corrosion-resistant member 7 as shown in FIG. The mold tip 1B can be obtained only in a modified example in which the iron plating layer 8 appears on the same continuous surface. That is, according to this method, the tip 1B in which the surface of the corrosion-resistant member 7 is not covered with the iron plating layer 8 is obtained.

A second embodiment of the soldering iron tip of the present invention will be described with reference to FIGS.
As shown in FIGS. 11 and 12, the tip 1C of the second embodiment has a groove 9 that can receive a pin-like terminal provided on a printed wiring board at the front end of the tip 3 of the tip. Have. That is, the tip 1C is a tip for moving soldering soldering that performs soldering while moving the soldering iron along the row of pin-shaped terminals.

  The tip 1C of the second embodiment has a solder supply surface 10 that is continuous with the groove bottom of the groove 9 and is inclined at a predetermined angle. The solder supply surface 10 is a portion for bringing the linear solder into contact with the linear solder by supplying the linear solder to the groove portion 9. A recess 11 is provided at a portion of the solder supply surface 10 where the linear solder contacts, and the corrosion-resistant member 7 is embedded in the recess 11. And the iron plating layer 8 is formed in the surface of the base material 4 and the corrosion-resistant member 7 by performing the iron plating process to the said base material 4 from on the corrosion-resistant member 7. FIG.

  An example of the manufacturing method of the tip 1C of 2nd Embodiment is demonstrated using FIGS. 13-16. First, as shown in FIG. 13, a copper base material 4 whose initial shape is a columnar shape is prepared, and the recess 11 that is recessed in the radial direction of the base material 4 is formed on the base material 4. The bottom of the recess 11 is formed flat. Then, as shown in FIG. 14, the column-shaped raw corrosion-resistant member 7 is pushed in until it hits the bottom of the recess 11, and as shown in FIG. 15, the solder-resistant member 7 is attached to the position where the corrosion-resistant member 7 is attached. The base material 4 and the corrosion-resistant member 7 are cut so that the supply surface 10 is formed, and processed into a tip shape for the moving solder iron having the tip body portion 2 and the tip end portion 3. And the iron tip 1C which formed the iron plating layer 8 on this base material 4 and the corrosion-resistant member 7 is manufactured by iron-plating the said base material 4 from on the said corrosion-resistant member 7.

In addition, as shown in FIGS. 17-19, also when manufacturing the tip for moving soldering irons, after cutting the base material 4 into the tip shape first, the corrosion-resistant member 7 is made into the base material 4. You can follow the manufacturing procedure to install.
In this case, first, as shown in FIG. 17, the base material 4 having an initial column shape is formed into a tip shape for a moving solder iron having the tip main body portion 2 and the tip end portion 3. In addition to cutting, a recess 11 is formed in the solder supply surface 10. Then, as shown in FIG. 18, the raw corrosion-resistant member 7 having a cylindrical shape is pushed in until it hits the bottom of the recess 11, and the substrate 4 is iron-plated with the corrosion-resistant member 7 protruding from the solder supply surface 10. do. Then, by cutting the protruding excess portion of the corrosion-resistant member 7 along the inclination of the solder supply surface 10, as shown in FIG. 19, the surface of the corrosion-resistant member 7 and the iron plating layer 8 are continuous on the same surface. A modified tip 1D can be obtained. By this method, the tip 1D in which the surface of the corrosion-resistant member 7 is exposed from the iron plating layer 8 is obtained.

1A-1D Tip 4 Substrate 6 Through hole 7 Corrosion resistant member 8 Iron plating layer 11 Dimple

In order to solve the above-mentioned problem, according to the present invention, a soldering iron tip for melting and soldering linear solder, the iron tip is provided with an iron plating layer on the surface of a copper base material A tip of the tip of the linear solder that melts the linear solder in contact with the tip of the linear solder during soldering. A part for inserting a member consisting of a through-hole or a non-penetrating recess extending in the radial direction of the tip is formed inside the tip of the tip from one side having the solder contact portion to the other side. In addition, a corrosion-resistant member having corrosion resistance against solder rather than copper is inserted inside the portion for inserting the member, and the end surface of the corrosion-resistant member is at the solder contact portion on the side surface of the tip end portion of the tip. is exposed from the substrate, this Soldering tip of the soldering 鏝用 is provided, wherein.

In the present invention, the corrosion-resistant member is formed of a cylinder, and the portion for inserting the member is formed of a circular through hole, and the corrosion-resistant member is inserted into the through-hole from the solder contact portion to the tip of the tip. Even if it is inserted in a state of penetrating the base material so as to reach the other side surface of the tip portion, or the corrosion-resistant member is made of a cylinder, and the portion for inserting the member is made of a circular depression The corrosion-resistant member may be inserted into the recess with the end face exposed from the base material at the solder contact portion.

Moreover, in this invention, the end surface of the said corrosion-resistant member may be covered with the iron plating layer, or may be exposed from the iron plating layer.

Further, in the present invention, the corrosion-resistant member is formed of a non-metal of alumina, zirconia, silicon nitride, or aluminum nitride even if formed of a metal material of iron, nickel, or aluminum. May have been.

Claims (7)

It is a tip for soldering iron that melts linear solder and solders,
The tip is formed by applying an iron plating layer on the surface of a copper base material, and the tip of the tip is in contact with the linear solder during soldering. A soldering iron tip characterized by having a member attached thereto.   The tip for soldering iron according to claim 1, wherein the corrosion-resistant member is covered with an iron plating layer.   The tip of the soldering iron according to claim 1, wherein the corrosion-resistant member is exposed from the iron plating layer.   The tip for soldering iron according to any one of claims 1 to 3, wherein the corrosion-resistant member is formed of any metal material of iron, nickel, and aluminum.   4. The soldering iron tip according to claim 1, wherein the corrosion-resistant member is made of any non-metal of alumina, zirconia, silicon nitride, and aluminum nitride.   The tip for soldering iron according to claim 1, wherein the corrosion-resistant member is embedded in a recess provided in the base material.   The tip for soldering iron according to claim 1, wherein the corrosion-resistant member is inserted into a through-hole penetrating the base material.

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