JPH07144271A - Soldering iron - Google Patents

Abstract

PURPOSE:To provide a soldering iron tip which does not melt in solder and is not corroded by a flux by solving the problem with the soldering iron of a point soldering device that the front end part of an iron tip base body made of copper is alloyed with the solder and eventually melts into the solder. CONSTITUTION:The front end of the iron tip base body 1 made of ceramic is provided with a metallic film 2 having good wettability with the solder, by which the melting of the ceramic of the iron tip base body 1 into the solder and the wear thereof are averted and the corrosion and wear by the flux are prevented. In addition, only the part of the metallic film 2 is wetted with the solder and, therefore, the stable soldering with high quality and high grade is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soldering iron used for soldering electronic components and the like.

[0002]

2. Description of the Related Art In recent years, as a soldering method, a method of soldering a plurality of points of solder in a high quality including a flow and a reflow has been improved. However, point soldering that cannot be processed by flow, reflow, etc. remains, and these soldering are done by using a point automatic soldering device using a robot or the like, or the operator solders point by point. However, iron solder is often used for this soldering.

The tip of a conventional soldering iron used for point soldering will be described below.

FIG. 2 shows a conventional iron tip. In FIG. 2, 3 is a ceramic heater, 4 is a copper tip base, 5 is an iron plating layer, 6 is a chrome plating layer, and 7 is a solder plating layer.

The function of the soldering iron tip having the above-described structure will be described below.

First, the ceramic heater 3 is caused to generate heat to heat the iron tip base body 4 made of copper to store heat. Then, the solder is supplied from the outside to the portion of the solder plating layer 7, and the solder is melted by the heat of the iron tip base body 4 made of copper to perform the soldering work. At this time, the chrome-plated layer 6 uses the fact that the solder wettability of chrome is poor, so that the solder does not adhere to areas other than the solder-plated layer 7.

[0007]

However, in the above-mentioned conventional structure, after the solder contacts the iron plating layer 5 through the solder plating layer 7 and the iron plating layer 5 is eroded into the solder, the iron tip made of copper is used. Since the base 4 and the solder supplied from the outside come into direct contact, the copper alloys with the solder and melts into the solder, and the tip portion of the copper tip base 4 melts and wears, resulting in the iron tip shape. Change and adversely affect the soldering quality.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a soldering iron tip which is neither dissolved in solder nor corroded by flux.

[0009]

To achieve this object, a soldering iron of the present invention is heated by a heater for heating a soldering iron tip, and a metal film having good solder wettability is formed at the tip of the soldering iron tip made of ceramics. It is characterized by having.

[0010]

With this structure, when ceramics having extremely poor solder wettability is used as the base material of the iron tip, the solder is attached only to the metal film of the iron tip, is stable, and has high accuracy.
High quality soldering can be performed. Further, since ceramics are neither dissolved in solder nor corroded by flux, trowel tip wear and trowel tip shape change are small, and high precision and high quality soldering is possible.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a ceramic iron tip base, 2 is a metal film having good solder wettability, such as nickel, and 3 is a ceramic heater.

The details of the soldering iron tip configured as described above will be described below. First, the ceramic heater 3 is heated to heat the ceramic iron tip base 1. Here, the metal film 2 is pressed against the soldering point to heat the soldering object. Since the ceramic used has a high thermal conductivity, the ceramic heater 3 that generates a large amount of heat is used in order to prevent the heat of the iron tip base body 1 made of ceramic from being rapidly taken by the object to be soldered and lowering the temperature. The switching is finely controlled to stabilize the temperature. When the object to be soldered reaches an appropriate temperature, the solder is supplied from the outside to the portion of the metal film 2 and the solder is melted to perform the soldering work. At this time, the ceramic iron tip base 1
Has extremely poor solder wettability, and due to this feature, the melted solder only adheres to the portion of the metal film 2 having good solder wettability.

In addition, the ceramic iron tip base 1 is
Since it does not alloy with solder to melt and does not corrode even with flux, the soldering iron tip does not melt, corrode and wear, and the shape does not change, and stable, high-precision, high-quality soldering is possible.

[0015]

As described above, according to the present invention, by using ceramics for the soldering iron tip base of the soldering iron, the soldering iron tip does not melt and wear into the solder, nor does it cause corrosive wear by the flux. Since the solder wettability of the ceramics is very poor, only the portion of the metal film having good solder wettability at the tip of the iron tip is wetted by the solder, which enables stable high quality and high quality soldering.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a soldering iron tip of a soldering iron according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing a soldering iron tip of a conventional soldering iron.

[Explanation of symbols]

 1 Ceramic Iron Tip Base 2 Metal Film 3 Ceramic Heater

Claims (2)

[Claims] 1. A soldering iron, which is heated by a heater for heating a soldering iron, and is provided with a metal film having good solder wettability at a tip of a soldering iron soldering tip made of ceramics by a method such as plating or vapor deposition. 2. The soldering iron according to claim 1, wherein the soldering iron tip and the heater for heating the ironing tip are separated.