Manufacturing method for tip of soldering iron

Abstract

To provide a manufacturing method for a tip of a soldering iron that can manufacture a tip of a soldering iron with high quality, at low cost.SOLUTION: A manufacturing method for a tip of a soldering iron can manufacture a tip of a soldering iron by sequentially executing a joining step of joining a tip member 20 to a main body 10 of a tip of a soldering iron, a heat treatment step of applying heat treatment to components joined in the joining step to generate a diffusion layer on a joined interface between the tip of the soldering iron and the tip member, and a cutting step of cutting the joined tip member to form the member into a desired shape. This manufacturing method can manufacture the tip of the soldering iron without applying plating to a tip portion of the tip of the soldering iron. Further the generating the diffusion layer on the joined interface can prevent the tip member from peeling off from the main body of the tip of the soldering iron, in the cutting step.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an automatic soldering device and a method for manufacturing a soldering iron tip used for a soldering iron.

Background Art

[0002] As a conventional soldering iron tip, the one shown in Patent Document 1 is known. This soldering iron tip is made of a copper material with good thermal conductivity, and by applying iron plating to its tip, it is configured to prevent erosion by solder and withstand wear during use.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional soldering iron tip, since a longer lifespan can be obtained with a thicker iron plating, a means for applying a thick iron plating has been used. However, due to the nature of iron plating, there has been a quality problem in that the thickness becomes uneven. In addition, when applying a thick iron plating, iron metal particles may occur at the sharp tip portion of the soldering iron tip, and this portion has to be shaved off by additional processing, which also poses a cost problem.

[0005] The present invention has been created in view of the above problems, and an object thereof is to provide a method for manufacturing a soldering iron tip capable of manufacturing a high-quality soldering iron tip at low cost.

Means for Solving the Problems

[0006] The above problem can be solved by a method for manufacturing a soldering iron tip, which sequentially executes a joining step of joining a tip member to the soldering iron tip body, a heat treatment step of performing heat treatment on the parts joined by the joining step to generate a diffusion layer at the joining interface between the soldering iron tip and the tip member, and a cutting step of cutting the joined tip member into a desired shape.

Advantages of the Invention

[0007] According to the present invention, since the soldering iron tip is manufactured without plating the tip portion of the soldering iron tip, various problems caused by plating do not occur. Therefore, the soldering iron tip manufactured by the present invention is excellent in quality and cost. In particular, by generating a diffusion layer at the joining interface between the soldering iron tip and the tip member through the heat treatment step, it is possible to prevent the tip member from peeling off from the soldering iron tip body in the cutting step.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the soldering iron tip 1 manufactured according to the present invention, and FIGS. 2 and 3 show the components constituting the soldering iron tip. Reference numeral 10 denotes a soldering iron tip body made of pure copper (for example, oxygen-free copper), and 20 denotes a tip member made of pure iron. The soldering iron tip body 10 and the tip member 20 are configured to be joinable to each other. These soldering iron tip body 10 and tip member 20 are processed into a shape to be described in detail later by a cold forging machine (not shown) such as a header or a former. Note that the material of the soldering iron tip body 10 is preferably oxygen-free copper, which is a material with high thermal conductivity, but may be a copper alloy in some cases. Also, the material of the tip member 20 is preferably pure iron, but may be steel in some cases.

[0010] As shown in FIG. 2, the soldering iron tip body 10 has a solid shaft shape, and a protrusion 11 is integrally formed at its tip. This protrusion 11 has a two-stage shape with a large-diameter protrusion 11a and a small-diameter protrusion 11b. The outer diameter of the large-diameter protrusion 11a is set to about 2 / 3 of the outer diameter of the soldering iron tip body 10, and the outer diameter of the small-diameter protrusion 11b is set to about 1 / 3 of the outer diameter of the soldering iron tip body 10.

[0011] As shown in FIG. 3, the tip member 20 has a solid shaft portion 21, and a cylindrical portion 22 having a hollow hole 22a that can be fitted and mated with the protrusion 11 of the soldering iron tip body 10 is integrally formed at one end thereof.

[0012] Hereinafter, a method for manufacturing the soldering iron tip 1 using the soldering iron tip body 10 and the tip member 20, which are the components described above, will be described with reference to FIGS. 4 to 6. The method for manufacturing the soldering iron tip of the present invention sequentially executes a joining step and a cutting step.

[0013] The joining step is a step of joining the soldering iron tip body 10 and the tip member 20. As shown in FIG. 4, with the protrusion 11 of the soldering iron tip body 10 facing forward (upward in the drawing), the soldering iron tip 10 is inserted into the forming hole 3 of the receiving die 2 over its entire length.

[0014] Also, at the back of the forming hole 3 of the receiving type 2, a knockout pin 4 having the same diameter as the forming hole 3 and slidable along it is arranged. By these forming holes 3 and the knockout pin 4, while the cylindrical portion 22 of the tip member 20 and the soldering iron tip main body 10 are constrained, the solid shaft portion 21 continuously provided to the cylindrical portion 22 becomes unconstrained. Note that the outer diameters of the soldering iron tip main body 10 and the cylindrical portion 22 of the tip member 20 are set to be the same, and since the forming hole 3 of the receiving type 2 is configured to have the same diameter as the outer diameters of the soldering iron tip main body 10 and the cylindrical portion 22, the soldering iron tip main body 10 and the cylindrical portion 22 are fitted into this forming hole 3 with a fitting clearance.

[0015] Next, as shown in FIG. 5, when the solid shaft portion 21 of the tip member 20 is pressed by the punch 5 and compressed in the axial direction, the solid shaft portion 21 is plastically deformed into a circular flange shape and the flange portion 23 is formed. At this time, since the cylindrical portion 22 of the tip member 20 is constrained by the receiving type 2 and the soldering iron tip 10, the inner peripheral wall surface forming the hollow hole 22a of the cylindrical portion 22 is crimped to the protrusion 11 of the soldering iron tip main body 10. Thereby, the cylindrical portion 22 of the tip member 20 is joined to the end surface 10a of the soldering iron tip main body 10 and the protrusion 11 continuously provided to this end surface with a high degree of adhesion.

[0016] In the above joining step, an example in which the flange portion 23 is formed on the central shaft portion 21 of the tip member 20 is shown, but the joining step of the present invention is not necessarily limited to this. For example, the tip member 20 is inserted into the forming hole 3 of the receiving type 2 over the entire length, thereby constraining the outer periphery of the solid shaft portion 21 of the tip member 20. In this state, by pressing and compressing the solid shaft portion 21 with the punch 5, it is also possible to join the soldering iron tip main body 20 and the joining member 20. According to such a joining step, since the flange portion 23 is not formed on the central shaft portion 21 of the tip member 20, it is not necessary to cut the flange portion 23 in the cutting step, so that material loss can be reduced.

[0017] Subsequently, the heat treatment process is a process of performing carburizing and quenching as an example of surface heat treatment on the parts joined by the joining process, and is for generating a diffusion layer at the joining interface between the soldering iron tip body 10 and the tip member 20. Also, by performing surface heat treatment instead of general heat treatment, the surface hardness of the steel tip member 20 increases significantly, so that while generating a diffusion layer at the joining interface, it is possible to manufacture a soldering iron tip 1 with excellent wear resistance.

[0018] Subsequently, as shown in FIG. 6, the cutting process is a process of cutting the tip member 20 joined to the soldering iron tip body 10 into a desired shape. As the method, by using a known machine tool (not shown) to cut along the line indicated by the two-dot chain line in FIG. 6, the flange portion 23 of the tip member 20 is cut off, and the tip member 20 is cut so that the tip of the tip member 20 has a shape like a minus driver and is formed into a minus driver type. By cutting in this way, the soldering iron tip 1 having the shape shown in FIG. 1 can be formed.

[0019] Finally, it is desirable to apply solder plating to the tip surface of the soldering iron tip 1 formed into a desired shape by the cutting process in order to improve the wettability of the solder. Also, it is desirable to apply chromium plating to the surfaces other than the tip.

[0020] In addition, in the above cutting process, an example of forming the tip member 20 into a minus driver type is shown, but the cutting process of the present invention is not necessarily limited to this, and it may be cut and formed into a known shape of the soldering iron tip 1. For example, the tip member 20 may be cut into a conical shape and formed into a pencil type. Alternatively, it may be a knife type, or a part of the tip member 20 may be cut into a tapered shape and formed into a bevel type. These shapes can be realized by changing the design of the outer diameter dimension of the protrusion 11 of the soldering iron tip body 10, the thickness of the cylindrical portion 22 of the tip member 20, and the overall length as needed, and securing a cutting allowance according to the desired tip shape.

[0021] According to the manufacturing method of the soldering iron tip 1 described above, in the joining step, as a means of coating the tip of the soldering iron tip body 10 with pure iron, mechanical joining is used instead of electroplating. In other words, the tip member of the pure iron material is coated on the protrusion 11 of the soldering iron tip 10 by mechanical joining. Then, in the cutting step, it is cut into a desired tip shape so that the protrusion 11 of the soldering iron tip body 10 does not expose from the surface of the tip member 20. The soldering iron tip 1 manufactured in this way is such that the protrusion 11 of the soldering iron tip body 10 made of pure copper material functions as the core material of the soldering iron tip, and the tip member 20 of pure iron coating this will exhibit the same function as the pure iron electroplating of the soldering iron tip.

[0022] Also, in the heat treatment step, a diffusion layer is generated at the joining interface between the soldering iron tip body 10 and the tip member 20, and since the joining strength of the joining interface is enhanced, it is possible to prevent the tip member 20 from peeling off from the soldering iron tip body 10 in the cutting step.

[0023] Furthermore, in the heat treatment step, if general heat treatment is performed, the hardness of the original material may decrease. However, in this embodiment, by performing carburizing and quenching as an example of surface heat treatment instead of general heat treatment, while generating a diffusion layer at the joining interface, the surface hardness of the steel tip member 20 can be increased.

[0024] As described above, according to the manufacturing method of the soldering iron tip 1 described above, it is possible to manufacture the soldering iron tip 1 without using electroplating, so it is excellent in production cost, various problems caused by electroplating do not occur, and it is possible to provide a soldering iron tip with excellent quality.

Explanation of symbols

[0025] 1 Soldering iron tip 2 Receiving mold 3 Forming hole 4 Knockout pin 5 Punch 10 Soldering iron tip body 11 Protrusion 11a Large diameter protrusion 11b Small-diameter protrusion 11c End face 20 Tip member 21 Solid shaft portion 22 Cylindrical portion 22a Hollow hole 23 Flange portion

Claims

【Claim 1】 a joining step of joining a tip member to the soldering iron tip body; a heat treatment step of heat-treating the parts joined by the joining step to generate a diffusion layer at the joining interface between the soldering iron tip and the tip member; a cutting step of cutting the joined tip member into a desired shape; A method for manufacturing a soldering iron tip, characterized by sequentially performing the above steps to manufacture the soldering iron tip.

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