Method for manufacturing soldering iron tip

Abstract

To provide a method for manufacturing a soldering iron tip, the method enabling a high-quality soldering iron tip to be manufactured at low cost.SOLUTION: A method for manufacturing a soldering iron tip is provided, comprising the following steps performed sequentially: a joining step in which a tip member 20 is joined to a soldering iron tip main body 10; a heat treatment step in which heat treatment is performed for a component joined by the joining step to generate a diffusion layer on a joining interface between a soldering iron tip and the tip member; and a cutting step in the joined tip member is cut, and is molded into a desired shape. Particularly, it is preferable that a raw material of the soldering iron tip main body comprises pure copper or copper alloy, a raw material of the tip member comprises pure iron or steel, and carburization hardening is performed as the heat treatment step.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] A conventional soldering iron tip is known from Patent Document 1. This soldering iron tip is made of a copper material with good thermal conductivity, and its tip is iron-plated to prevent corrosion by solder and to withstand wear and tear during use. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 64-33373 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional soldering iron tips, the thicker the iron plating, the longer the life of the iron tip can be obtained, so a method of applying a thick iron plating is used, but this has the quality problem of uneven thickness due to the nature of the iron plating. Also, when the iron plating is applied thickly, iron metal particles may be generated at the sharp tip of the soldering iron tip, and this part must be removed by additional processing, which also has a cost problem.

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

[0006] The above problem can be solved by a method for manufacturing a soldering tip, in which a soldering tip is manufactured by sequentially carrying out a joining process of joining a tip member to a soldering tip body, a heat treatment process of applying heat treatment to the parts joined by the joining process to generate a diffusion layer at the joint interface between the soldering tip and the tip member, and a cutting process of cutting the joined tip member to form it into a desired shape.

[0007] It is preferable that the material of the soldering iron tip body is pure copper or a copper alloy, and the material of the tip member is pure iron or steel, and that the parts joined in the joining process are subjected to carburizing and quenching, which is an example of surface heat treatment, as a heat treatment process. Effect of the Invention

[0008] According to the present invention, the soldering tip is manufactured without plating the tip portion of the soldering tip, and therefore various problems caused by plating do not occur, and the soldering tip manufactured according to the present invention is excellent in quality and cost. In particular, by forming a diffusion layer at the joint interface between the soldering tip and the tip member by the heat treatment process, it is possible to prevent the tip member from peeling off from the soldering tip body in the cutting process. In addition, by performing carburizing and quenching as a surface hardening heat treatment in the heat treatment process of the parts joined in the joining process, the surface hardness of the steel tip member is greatly increased, so that a soldering tip with excellent wear resistance can be manufactured while forming a diffusion layer at the joint interface. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a soldering tip manufactured by a soldering tip manufacturing method according to the present invention; [Diagram 2] 1 is a front view showing a soldering tip body, which is a component constituting a soldering tip manufactured by the soldering tip manufacturing method of the present invention. FIG. [Diagram 3] 1 is a cross-sectional view showing a tip member of a component constituting a soldering iron tip manufactured by a manufacturing method of a soldering iron tip according to the present invention. [Figure 4]1 is a diagram showing a state before bonding in a bonding step in a manufacturing method of a soldering iron tip according to the present invention; [Diagram 5] 4A to 4C are diagrams showing a state after joining in a joining step in the manufacturing method of the soldering iron tip of the present invention. [Figure 6] 4A to 4C are diagrams showing a cutting step in the manufacturing method of the soldering iron tip of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a soldering tip 1 manufactured by the present invention, and FIG. 2 and FIG. 3 show components constituting the soldering tip. Reference numeral 10 denotes a soldering tip body made of pure copper (e.g., oxygen-free copper), and 20 denotes a tip member made of pure iron, and the soldering tip body 10 and tip member 20 are configured so that they can be joined together. The soldering tip body 10 and tip member 20 are processed into a shape to be described in detail later by a cold heading machine such as a header or former (not shown). The material of the soldering 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. The material of the tip member 20 is preferably pure iron, but may be steel in some cases.

[0011] 2, the soldering iron tip body 10 has a solid shaft shape, and a protrusion 11 is integrally formed at its tip. The protrusion 11 has a two-stage shape consisting of 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.

[0012] As shown in FIG. 3, the tip member 20 has a solid shaft portion 21, one end of which is integrally formed with a cylindrical portion 22 having a hollow hole 22a that can be fitted into the protrusion 11 of the soldering iron tip body 10.

[0013] 4 to 6, a method for manufacturing a soldering tip 1 using the above-mentioned components, the soldering tip body 10 and the tip member 20, will be described below. The method for manufacturing a soldering tip of the present invention sequentially performs a joining step and a cutting step.

[0014] The joining process is a process of joining the soldering tip body 10 and the tip member 20, and as shown in Figure 4, the protrusion 11 of the soldering tip body 10 is placed forward (upper in the drawing) and the soldering tip 10 is inserted over its entire length into the molding hole 3 of the receiving mold 2.

[0015] Further, a knockout pin 4 of the same diameter as the molding hole 3 is arranged at the back of the molding hole 3 and is slidable along the molding hole 3, and the molding hole 3 and knockout pin 4 constrain the cylindrical portion 22 of the tip member 20 and the soldering iron tip body 10, while the solid shaft portion 21 connected to the cylindrical portion 22 is not constrained. The outer diameters of the soldering iron tip body 10 and the cylindrical portion 22 of the tip member 20 are set to be the same, and the molding hole 3 of the receiving mold 2 is configured to be the same diameter as the outer diameters of the soldering iron tip body 10 and the cylindrical portion 22, so that the soldering iron tip body 10 and the cylindrical portion 22 fit into the molding hole 3 with a fit that is approximately a clearance fit.

[0016] Next, as shown in Fig. 5, when the solid shaft portion 21 of the tip member 20 is pressed by a punch 5 and compressed in the axial direction, the solid shaft portion 21 is plastically deformed into a circular flange shape to form a flange portion 23. At this time, since the cylindrical portion 22 of the tip member 20 is restrained by the receiving die 2 and the soldering iron tip 10, the inner peripheral wall surface forming the hollow hole 22a of the cylindrical portion 22 is pressed against the protrusion 11 of the soldering iron tip body 10. As a result, the cylindrical portion 22 of the tip member 20 is joined with a high degree of adhesion to the end face 10a of the soldering iron tip body 10 and the protrusion 11 connected to this end face.

[0017] In the above-mentioned joining process, an example in which the flange portion 23 is formed on the central shaft portion 21 of the tip member 20 has been shown, but the joining process of the present invention is not necessarily limited to this. For example, the tip member 20 is inserted over its entire length into the forming hole 3 of the receiving die 2, thereby restraining the outer periphery of the solid shaft portion 21 of the tip member 20. In this state, the solid shaft portion 21 can be pressed and compressed with a punch 5 to join the soldering iron tip body 20 and the joining member 20. According to this joining process, the flange portion 23 is not formed on the central shaft portion 21 of the tip member 20, so there is no need to cut the flange portion 23 in the cutting process, and therefore material loss can be reduced.

[0018] The next heat treatment step is a step of subjecting the parts joined by the joining step to carburizing and quenching as an example of surface heat treatment, and is intended to generate a diffusion layer at the joining interface between the soldering tip body 10 and the tip member 20. By performing surface heat treatment instead of general heat treatment, the surface hardness of the steel tip member 20 is greatly increased, so that a soldering tip 1 with excellent wear resistance can be manufactured while generating a diffusion layer at the joining interface.

[0019] Next, 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 a method for this, a known machine tool (not shown) is used to cut along the line shown by the two-dot chain line in Fig. 6, thereby cutting off the flange portion 23 of the tip member 20 and cutting the tip member 20 so that the tip of the tip member 20 has a shape like a flat-head screwdriver. By cutting in this manner, the soldering iron tip 1 having the shape shown in Fig. 1 can be formed.

[0020] Finally, it is preferable to plate the tip surface of the soldering iron tip 1 formed into a desired shape by the cutting process with solder in order to improve the wettability of the solder. It is also preferable to plate the surfaces other than the tip with chrome.

[0021] In the above cutting step, an example of forming the tip member 20 into a flathead screwdriver type has been shown, but the cutting step of the present invention is not necessarily limited to this, and the tip member 20 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 cone shape and formed into a pencil shape. Alternatively, the tip member 20 may be cut into a knife shape, or a part of the tip member 20 may be cut into a tapered shape and formed into a bevel shape. These shapes can be realized by modifying the design of the outer diameter dimension of the protrusion 11 of the soldering iron tip body 10, the thickness and overall length of the cylindrical portion 22 of the tip member 20 as necessary, and ensuring a cutting allowance according to the desired tip shape.

[0022] According to the manufacturing method of the soldering tip 1, in the joining step, mechanical joining is used instead of iron plating as a means for coating the tip of the soldering tip body 10 with pure iron. In other words, the protrusion 11 of the soldering tip 10 is coated with a tip member made of pure iron by mechanical joining. Then, in the cutting step, the protrusion 11 of the soldering tip body 10 is cut into a desired tip shape so that the protrusion 11 of the soldering tip body 10 is not exposed from the surface of the tip member 20. In the soldering tip 1 manufactured in this way, the protrusion 11 of the soldering tip body 10 made of pure copper functions as the core material of the soldering tip, and the tip member 20 of pure iron that coats it performs the same function as the pure iron plating of the soldering tip.

[0023] In addition, in the heat treatment process, a diffusion layer is generated at the joint interface between the soldering tip body 10 and the tip member 20, and the joint strength of the joint interface is increased, so that the tip member 20 can be prevented from peeling off from the soldering tip body 10 in the cutting process.

[0024] Furthermore, if general heat treatment is performed in the heat treatment process, the hardness of the material may decrease to the original hardness. However, in the present embodiment, the surface hardness of the steel tip member 20 can be increased while forming a diffusion layer at the bonding interface by performing carburizing quenching as an example of surface heat treatment instead of general heat treatment.

[0025] As described above, according to the manufacturing method of the soldering iron tip 1, it is possible to manufacture the soldering iron tip 1 without using iron plating, so that a soldering iron tip with excellent production costs, free from the various problems caused by iron plating, and excellent quality can be provided. [Explanation of symbols]

[0026] 1 Soldering iron tip 2. Receiving type 3 Molding Hole 4 Knockout pins 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 22 Cylindrical part 22a Hollow hole 23 Flange

Claims

1. a joining step of joining a tip member to a soldering iron tip body; a heat treatment step of subjecting the parts joined by the joining step to a heat treatment 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; The method for manufacturing a soldering iron tip comprises the steps of:

2. 2. The method for manufacturing a soldering iron tip according to claim 1, wherein the material of the soldering iron tip body is pure copper or a copper alloy, the material of the tip member is pure iron or steel, and a surface heat treatment is performed as a heat treatment process for the parts joined in the joining process.

3. 3. The method for manufacturing a soldering iron tip according to claim 2, wherein the surface heat treatment is carburizing and quenching.

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