JPS61229475A - Wire feeding controller - Google Patents

Abstract

PURPOSE:To increase the welding quality and to reduce the production cost by stopping the wire feeding during short circuiting period and by preventing the generation of spatters due to the bend of the wire. CONSTITUTION:The titled controller is composed of the cylindrical plunger 9 having the passage for wire 1 on the center part, having a taper shaped taper part 11 on one end part and having the slits 10 along the shaft core direction on plural places in the peripheral direction, the plunger support 12 to constrain the wire 1 by reducing the diameter of the plunger 9 in the engaged state and which is engageable with one part of the plunger 9 thereof, the discriminator 15 to discriminate the arc state and short circuiting state and the coil 13 to fit each other by relatively moving the plunger 9 and plunger support 12 with being over-charged when the discriminator 15 judges it being in the short circuiting state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wire feed controller for controlling the feed of a consumable electrode (hereinafter referred to as "wire") to a weld.

2. Description of the Related Art Conventionally, as shown in FIG. 3, a wire 1 is rotated at a constant speed.
After being sent out by the IwJ wire feeding motor 2, the wire passes through the bond cable 3, and is supplied with electricity by the current-carrying tip 4 in the welding torch to reach the welding part. During this time, the vehicle maintains a nearly constant speed without being actively controlled. In FIG. 3, 5 is a torch body, 6 is a shielding nozzle, 7 is a welding base material, and 8 is a torch handle.

Problems to be Solved by the Invention In such a case, in short-circuit transfer type welding such as CO2 welding, the wire 1 may be short-circuited to the welding base material 7 via the molten pool, for example, when the welding current is 200 A. Approximately 1 [m
Since the wire is fed toward the welding base material 7 at a relatively high speed of s]/10 [m5ec], the solid phases collide with each other, and the semi-molten part of the wire 1 is bent by the reaction force. This bent portion is likely to become spatter and be blown away when the short circuit is broken and the arc is re-ignited. Of course, since spatter adheres to the welding equipment such as the welding torch and the welding base material 7, it takes extra man-hours to remove it, and the machine has to be stopped for removal, resulting in problems in terms of production costs. This is not preferable because it not only occurs, but also accumulates on the shielding nozzle 6, significantly impairing gas shielding properties and causing deterioration of welding quality such as blowholes.

The present invention solves the above-mentioned conventional drawbacks, and aims to provide a wire feed controller that can eliminate spatter caused by the above-mentioned causes and improve welding quality and production costs.

Means for Solving the Problems In order to solve the above problems, the wire feeding control I of the present invention
The plunger has a wire passage in the center, a tapered part at one end, and slits along the axis at multiple locations in the circumferential direction, and one end of the plunger. a plunger receiver that can be fitted to the part and that reduces the diameter of the plunger to restrain the wire in the fitted state; a discriminator that discriminates between an arc state and a short circuit state; and a discriminator that determines a short circuit state. The plunger and the plunger receiver are configured to include a coil that is energized when the plunger and the plunger receiver are moved relative to each other so that the plunger and the plunger receiver are fitted into each other.

Effect According to the above configuration, jI is applied to the coil from the power supply during the short circuit period.
1121! flows through the wire, and the magnetic field generated therein is exchanged for a wire restraining force to lock the wire. Therefore, the common phase plane of the wire and the solid phase plane of the base material maintain a certain distance and do not collide with each other, so that no spatter occurs. Furthermore, after arc regeneration, the coil current is cut off and the wire is fed to prevent the wire from burning up and welding to the energized tip. In this way, welding with little spatter can be maintained stablyξ
can be set. Note that the short-circuit state and the arc state can be easily distinguished by detecting the voltage since the difference in voltage between the two is large.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a block diagram of a welding apparatus equipped with a wire feed controller according to an embodiment of the present invention, and the same components as those shown in FIG. Omitted. In FIG. 1, 9 is a plunge V- through which the wire 1 can be passed, and is made of a ferromagnetic material such as iron. As shown in detail in FIG. 2, a slit 1G is provided on the side surface. When this plunger 9 is subjected to a radial force from the outer periphery, the slit 10 contracts,
The inner diameter of the tip of the tapered portion 11 becomes smaller. At this time, the inner diameter of the tip is determined to be smaller than the wire diameter.
The wire 1 can be restrained. Further, when the force is released, the inner diameter of the tip becomes larger than the wire diameter, and the restraining force of the wire 1 disappears.

12 is a plunger receiver, 13 is a coil, 14 is a power supply,
15 is a short circuit/arc discriminator.

The wire 1 fed out at a constant speed by a wire feeding motor 2 rotating at a constant speed passes through a conduit cable 3 with an inner diameter approximately twice the diameter of the wire, a torch body 5, a plunger 9, and an energizing tip 4, and then welds. However, when a short circuit condition is detected by the short circuit/arc discriminator 15, the electric current [j1
4 supplies current to the coil 13. As a result, a magnetic field is generated around the coil 13, and the plunger 9, which is installed so as to be able to move in the vertical direction, is pressed against the plunger receiver 12. Therefore, plunger receiver 1
2 and the tapered portion 11 of the plunger 9 engage, a force is generated at the tip of the plunger 9, and the wire 1 is restrained. This state continues until the next arc state is detected, but
The period is usually up to 30 [m5ec], and during this period, the wire 1 fed by the wire feeding motor 2 is
The slack is absorbed within the conduit cable 3 as shown by the broken line.

The coil current is then interrupted when an arcing condition is detected. As a result, the plunger 9 loses its upward force, the wire 1 is no longer restrained, and the wire 1 is fed again.

Since the plunger 9 and the plunger receiver 12 engage with each other to restrain the wire 1, the plunger receiver 12 may be moved instead of the plunger 9 as in this embodiment.

Further, the plunger 9 requires two or more slits 10.

In addition, since the voltage between the welding base material 7 and the wire 1 differs greatly between the short circuit state and the arc state, the voltage is detected by the short circuit/arc discriminator 15 and compared with a certain threshold voltage. Can be distinguished.

Effects of the Invention As described above, according to the present invention, it is possible to stop wire feeding during the short circuit period and prevent the occurrence of spatter due to bending of the wire, thereby improving welding quality and reducing production costs.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a welding device equipped with a wire feed controller according to an embodiment of the present invention, Fig. 2 is a perspective view of a plunger of the wire feed controller, and Fig. 3 is a conventional wire feed controller. It is a block diagram of a supply system. DESCRIPTION OF SYMBOLS 1...Wire, 9...Plunger, 10...Slit, 11...Tapered part, 12...Plunger receiver, 13...Coil, 15...Short circuit/arc discriminator' Figure 2

Claims (1)

[Claims] 1. A plunger having a wire passage in the center, a tapered part at one end, and slits along the axis at multiple locations in the circumferential direction, and one end of the plunger. a plunger receiver that is fittable and that reduces the diameter of the plunger and restrains the wire in the fitted state;
a discriminator that discriminates between an arc state and a short circuit state; and a coil that is energized to move the plunger and the plunger receiver relatively to fit each other when the discriminator determines that the short circuit state is present. Wire feed controller with.