JPH0475795A - Arc welding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an arc welding machine using a tungsten electrode, and particularly to a welding machine suitable for welding small parts.

<Prior Art> Arc welding using a tungsten electrode has been widely known, and conventional arc welding is used for welding relatively large parts.

Here, it may be necessary to assemble small parts by welding.

For example, the nozzle 1 for ejecting medicine shown in FIG. 6(C) is a small part with an outer diameter and height of several mm, but the base 2 and nozzle hole 3a are separated for the following reasons.

It is necessary to fabricate the orifice blade 3 and the orifice blade 3 separately from stainless steel material, and then weld them together.

In other words, the nozzle hole 3 has a diameter of several tens of μm or less.
a is to make the injected drug in a good injection state,
The length of the hole also needs to be set accurately, and if the nozzle 1 was manufactured as an integral part from the beginning, this kind of precision of the nozzle hole 3a could not be achieved.
) - It is necessary to make a plate 3, form a predetermined nozzle hole 3a, and string it to the base 2. So()
Some of the chemicals injected from nozzle 1 are quite active chemically, and may react with metals such as copper, aluminum, lead, etc., resulting in deterioration of the medicine and the formation of crystalline substances, which may cause clogging of the nozzle. However, even if the base 2 and orifice plate 3 are made of stainless steel, when soldering or brazing them, it is necessary to make the nozzle 1 stainless steel. There is a problem that the wax reacts with the chemical, and when bonding with an adhesive, the reliability of CJ and usage durability is lacking, and it is necessary to weld the base 2 and the orifice plate 3.

In this way, a chemical injection nozzle must be manufactured by separately processing the base and orifice blade from stainless steel. It was not possible to use conventional arc welding machines. In other words, since conventional arc welding machines are designed for welding relatively large parts, their arc current values are large, and if this machine is used to weld small parts, the parts may be destroyed by the excessive arc. Otherwise, the parts will blow off. On the other hand, when using a conventional arc welder to suppress the first current value to a small value, an arc cannot be generated.

Due to the above-mentioned circumstances, it has been strongly desired to realize an arc welding machine that can weld small parts without any problems.

The present invention has been made in view of the above-mentioned conventional circumstances, and it is an object of the present invention to provide an arc welding machine that generates a small arc with a relatively small arc current value and can thereby weld small parts without any trouble. With the goal.

<Means for Solving the Problems> An arc welding machine according to the present invention uses a tungsten electrode with a conical tip in an arc welding machine that generates an arc between the workpiece and the workpiece using a tungsten electrode. It is characterized by

<Function> By using a tungsten electrode with a conical tip, the arc welding machine of the present invention can generate a small arc in a minute range even with a small arc current, melting a minute range of small parts. to achieve good welding.

<Example> The present invention will be specifically explained based on examples.

FIG. 4 shows the external configuration of a)) welding machine for welding small parts according to an embodiment of the present invention.

The arc welding device of this embodiment is equipped with a controller 10, which controls the supply of current to the welding vent 11 and workbench 12, and the supply of argon gas from the cylinder 13 to the welding vent 11. ing. Further, a foot switch 14 for performing various manual operations and a microscope 15 having a shutter mechanism to protect the operator's eyes from arcs are connected to the controller IO.

The reason why the microscope 15 is provided is to perform detailed welding work on small parts, and the operator visually checks the welding location using this microscope 15 and performs the work.

Note that I6 is an outlet for connecting to an AC 10OV power source.

As shown in detail in FIG. 5, the welding ben 11 has a tungsten electrode 22 supported on a cylindrical body 21 with a narrowed tip, and argon gas is supplied into the cylindrical body 21 from a tube 23. tungsten electrode 22 to generate an arc.

Here, the welding ben 11 of this embodiment is provided with a mechanism for preventing welding with the workpiece. That is, the tungsten electrode 22 is attached to the movable element 25 of the solenoid 24, and the movable element 25 is biased toward the tip side by the spring 26, so that the tungsten electrode 22 protrudes from the tip of the cylindrical body 21 by a predetermined amount. However, when an arc is generated during welding work, the solenoid 24 is detected and the tungsten electrode 22 is slightly retracted against the spring 26. From this point, the connection between the workpiece and the tungsten electrode 22 is Prevents welding. still,
27 supplies arc current to the tungsten electrode 22;
A cable supplies driving current to the solenoid 24.

The diameter of the shaft portion of the tungsten electrode 22 of this embodiment is, for example, 0-5=1. 5 mm, and as shown in Figure 1, its tip is formed into a conical shape and is sharp (the tip angle is, for example, 1o = 20 degrees), which improves the current density without compromising the strength of the electrode 22 itself. The arc can be generated using a relatively small arc current.

In addition, the tungsten electrode with a cone-shaped tip in the present invention refers to one with a flat tip as shown in FIG.
This includes cylindrical tungsten electrodes cut into squares, as shown in Figure ζ. Even with such electrodes, the tip is sharpened to increase the arc current density, and this allows the arc to be generated with a relatively small arc current. It is possible to achieve the intended purpose of "generating".

The process of assembling a nozzle for liquid injection using an arc welding machine having the configuration shown in FIG. 6 will be described in FIGS.

As shown in FIG. 6(a), the base 2 and the orifice plate 3 having the nozzle holes 3a are made separately from stainless steel nozzles, and the base 2 is supported on a rotatable jig (). Place orifice plate 3 on base 2,
This orifice bulb 1 note 3 is pressed and fixed by the pressing member 6.

Then, as shown in FIG. 6(b), the tungsten electrode 22 is aimed at the joint between the base 2 and the orifice plate 3, and the arrow is sent to the base 2 and the orifice plate L.
=) A welded portion 8 spanning 3 is formed. Using a jig like this, the workpiece is rotated and the workpiece is rotated for a predetermined period of time, and a weld is made between the base 2 and the orifice plate 3 with one weld so that the adjacent welds 8 overlap each other by about 50%. Provide seamless welding.

``--Because the tip of the tungsten electrode 22 is sharp, the arc is concentrated in a very small area of the workpiece, and the heat is diffused, causing a very small part of the workpiece to be A molten pool can be created within the range. Further, the adjacent welded portion 8 is formed after the heat of the previously formed welded portion has cooled down to a certain extent, and the welded portion 8 is kept at I so that the welded portion 8 is not excessively heated. For these reasons, in the above-described welding operation, it is possible to avoid the workpiece being overheated, and damage to the workpiece, which is a small part, and deterioration of quality can be prevented.

In the above embodiment, an example was shown in which a liquid injection nozzle made of Stella 1 Noss material was manufactured, but the arc welding machine according to the present invention can also be used to manufacture other small parts made of the same material (for example,
It can also be used to manufacture pressure sensors, etc., and there are no special restrictions on its use.

<Effects of the Invention> According to the present invention, since the tungsten electrode used in the arc welding machine has a conical tip, a small arc can be generated in a minute range even with a small arc current, and it can be used for small parts. Capable of melting a minute area 6 Therefore, small parts such as liquid injection nozzles can be assembled by welding without any problems, and small parts with high performance and reliability can be manufactured. .

[Brief explanation of drawings]

FIG. 3 is a perspective view showing the tip of a tungsten electrode according to an embodiment of the present invention, FIG. 2 is a perspective view showing the tip of a tungsten electrode according to another embodiment of the invention, and FIG. FIG. 4 is a perspective view showing the tip of a tungsten electrode according to another embodiment of the present invention, FIG. 4 is a perspective view showing the overall configuration of an arc welding machine according to another embodiment of the present invention, and FIG. Cross-sectional view 5 showing the configuration of a welding pen of an arc welding machine according to an embodiment
, FIGS. 6(a) to 6(c) are conceptual diagrams sequentially explaining the assembly work of a liquid jet nozzle. 1 is a nozzle, 2 is a base, 3 is an orifice, 1 is a notebook, 11 is a welding pen, 12 is a workbench, and 22 is a tungsten electrode. Patent applicant Toppan Printing Co., Ltd.

Claims (1)

[Claims] An arc welding machine that performs welding by generating an arc between a tungsten electrode and a workpiece, characterized in that it uses a tungsten electrode with a cone-shaped tip.