JPH0245548B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic welding device that uses a computer to control intermittent welding.

BACKGROUND OF THE INVENTION In bridges, steel frames, etc., tack welding is usually performed before main welding of welded parts to ensure the accuracy of the cut during welding or the accuracy of the parts.

Conventionally, this tack welding has been performed by manual shielded arc welding, semi-automatic or fully automatic gas shielded arc welding, and welding is performed after the crease with a predetermined pitch and tack welding length. There were drawbacks such as:

B Due to human errors such as ruled line mistakes and welding mistakes, it is difficult to maintain the accuracy of the tack pitch and tack weld length.

(b) Standards regarding tack welding are not standardized, and strict compliance with individual standards tends to require complicated lines or welding work.

C. When performing tack welding on long parts, the tack welds at the beginning and end of the part may peel off due to welding thermal stress.

D. When performing tack welding using conventional covered arc manual welding or semi-automatic gas-shielded arc welding, it is an individual task for the welder and the welding efficiency is low; The problem is that the welding length is short and the advantages of full automation cannot be fully utilized.

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks, the present invention aims to provide a welding device that performs automatic intermittent welding by adding a computer and a rotary encoder. The object of the present invention is to provide a welding device that can be controlled based on the present invention.

Next, the welding apparatus of the present invention will be explained with reference to the drawings.

Figure 1 shows the external appearance of this welding device. 1 is a traveling carriage that can travel in a straight line;
A rotary encoder 2 for detecting and transmitting the traveling distance of the traveling carriage 1 is provided at its front end or rear end. In other words, it utilizes the fact that the number of output pulses of the rotary encoder 2 corresponds to the traveling distance of the traveling carriage 1. 3 is an automatic welding machine capable of continuous welding, and 5 is a control panel with a built-in computer 4, each of which is mounted on the traveling carriage 1. A welding pattern selection switch 6 for selecting one of a plurality of preset welding patterns including at least intermittent welding, and a running condition digital switch 7 to be described later are provided on the control panel 5.

The above-mentioned devices and their auxiliary devices are related to each other as shown in FIG.

First, the welding pattern selection switch 6 is
The signal from the switch 6 is sent to the computer 4. For example, the following welding patterns can be selected.

Pattern A: Repeated intermittent welding.

Pattern B: When the length of the member is long, the pitch at the beginning and end of the member is made smaller than in the center to prevent cracking due to welding thermal stress.

Pattern C: Continuous welding.

Other options include: Optimal pattern for strength and deformation required for intermittent welds.

7 is pitch, weld length in case of intermittent welding,
This is a running condition digital switch that selectively sets the member length, welding speed, and idle feed speed, and is connected to the computer 4, and the set signals are sent to the computer 4.

The calculator 4 calculates the welding conditions of the automatic welding machine 3, the traveling conditions of the traveling carriage 1, the number of welds, and the number of times of welding, from the selected pattern of the member length, welding length, pitch welding speed, and idling speed.

The number of output pulses P ₀ corresponding to the traveling distance from the rotary encoder 2 is sent to the calculator 4.
The rotary encoder 2 provides length signals regarding the welding length and the blank feed length to the computer 4. That is, the output pulse P ₀ of the rotary encoder 2 and the traveling distance L have a relationship of L=αP ₀ (α: constant), and when the traveling distance of the traveling carriage 1 becomes the number of output pulses P ₀ of the rotary encoder 2, It is now sent to computer 4.

As shown in FIG.
One of the output side terminals of the welding power source 8 is connected to the base material 10, and the other is connected to the contact jaw 11.

Among the welding conditions, the welding current and voltage are set by the welding current and voltage setting volume 12, and a corresponding signal is sent to the wire feeding motor 13, and the wire 14 is transferred from the wire pool 15 to the wire feeding device 1.
5', the wire is automatically fed via the wire feed roller 16 to intermittent welding.

Setting signals for on/off, welding speed, and idle feed speed of the traveling carriage 1 are sent from the computer 4 via the digital-to-analog converter 17 to the DC motor driver 18 to control the carriage traveling motor 19.

Next, the operation of the apparatus of the present invention will be explained.

First, the computer 4 is turned on and the welding power source 8 is turned on.

Subsequently, a welding travel pattern for intermittent welding is selected by a welding pattern selection switch 6, and the signal is sent to the computer 4.

In addition, when the pitch, weld length, member length, idle feed speed, and welding speed in intermittent welding are set with the running condition setting digital switch 7, those signals are sent to the computer 4.
sent to.

In the calculator 4, the number of times of welding, the number of blank feeds, and the blank feed length are calculated from the member length, weld length, pitch, and pattern. The length signals of the welding length and the idle feed length are converted into pulse number signals and input to the calculator 4. Further, the welding speed and idle feed speed set by the running condition setting digital switch 7 are converted into digital signals by the computer 4 in order to be sent to the digital-to-analog converter 17.

Next, when you press the automatic start switch 20,
The signal is sent to the computer 4, a welding start signal is sent to the welding power source 8 via the interface 9,
Welding starts, and a start signal sent from the computer 4 via the digital-to-analog converter 17 starts the carriage running motor 19 through the DC motor driver 18, and the carriage starts running.

The welding conditions are set by the welding current and welding voltage setting volume 12, and a corresponding signal is sent to the wire supply motor 13, and the wire 14 is automatically fed from the wire pool 15 via the wire feed roller 16. , welding is intermittent.

The traveling speed of the traveling carriage 1 during welding is determined by a welding speed signal set by the traveling condition setting digital switch 7 being sent to the computer 4, and a speed setting signal being sent from the calculator 4 to the DC motor driver 18 via the digital-to-analog converter 17. and controls the carriage drive motor 19 to maintain the welding speed.

During welding, if the number of pulses sent from the rotary encoder 2 attached to the traveling carriage 1 to the computer 4 is less than the number of pulses converted corresponding to the set welding length, welding is continued and when they become equal, A welding stop signal is sent from the computer 4 to the welding power source 8 via the interface 9, stopping welding and transitioning to idle feed.

The running speed of the traveling carriage 1 during dry feeding is determined by sending a signal of the dry feeding speed set by the running condition digital switch 7 to the computer, and a speed setting signal from the computer 4 to the DC motor driver 18 via the digital-to-analog converter 17. This feeds the carriage, controls the carriage drive motor 19, and maintains the idle feed speed.

During idle feed, pulses from the rotary encoder 2 attached to the traveling carriage 1 are sent to the computer 4, and if the number of pulses is less than the number of pulses converted according to the calculated idle feed length, the idle feed is maintained and becomes equal. When this happens, stop feeding and move on to the next welding.

After the above welding and dry feeding are completed,
The calculator 4 counts the number of welds once and the number of blank feeds once, and repeats this until the number of welds and the number of blank feeds are equal to the number of welds and the number of blank feeds calculated from the welding length, member length, pitch and pattern.

When the predetermined calculated number of welding and idle feeding is reached at the end of the member and the intermittent welding work is completed, the computer 4
A travel stop signal is sent from the motor 19 to the carriage travel motor 19, and the traveling carriage 1 is stopped. Also,
The signal sent from the computer 4 causes the buzzer 21 to sound, and the error segment display 22 and
The LED display 23 is displayed to inform the operator that the process has been completed.

The buzzer 21 is canceled by sending a stop signal from the buzzer reset switch 24 to the computer 4.

If the parts change and the intermittent welding conditions change,
A reset signal is sent from the CPU reset switch 25 to the computer 4, all memory is cleared, and resetting becomes possible.

If you want to stop welding midway, press the automatic stop switch 26 and send a stop signal to the computer 4.
A travel stop signal is sent from the computer 4 to the carriage travel motor 19 and via the interface 9.
A welding stop signal is sent to the welding power source 8, and traveling and welding are stopped.

When slightly moving the traveling carriage 1 to finely adjust the starting position in intermittent welding, the traveling inching switch 27 is pressed to send a signal to the computer 4, and the calculator 4 sends a traveling signal to the carriage traveling motor 19, causing the carriage to travel. Carriage 1 moves slightly.

Since the welding apparatus of the present invention is as described above, when the present invention is used, the intermittent welding pitch and welding length can be correctly maintained at the selected pitch and length, and human errors such as mistakes in ruled lines can be avoided. Induction can also be eliminated, and by setting the welding pattern switch appropriately for long parts, the pitch at the start and end of welding can be reduced, increasing the reliability of welding work and making work easier. Many effects can be obtained, including improved efficiency and low-cost welding.

[Brief explanation of drawings]

FIG. 1 is a front view of a welding device according to an embodiment of the present invention, FIG. 2 is a block diagram of the welding device of the present invention,
It is. 1... Traveling carriage, 2... Rotary encoder, 3... Automatic welding machine, 4... Calculator, 6...
Welding pattern selection switch, 7... Running condition digital switch, 8... Welding power source, 19... Carriage running motor.

Claims (1)

[Scope of Claims] 1. A traveling carriage capable of traveling in a straight line and driven by a drive motor; An automatic welding machine capable of intermittent welding mounted on the traveling carriage; An automatic welding machine mounted on the traveling carriage and traveling; a rotary encoder that detects the traveling distance of the carriage; a welding pattern selection switch that is mounted on the traveling carriage and selects one of a plurality of preset welding patterns including at least intermittent welding; A running condition digital switch that selectively sets the pitch, welding length, member length, welding speed, and idle feed speed when the The welding conditions and running conditions are calculated based on the signal, and the output signal is used to calculate the welding conditions and running conditions.
A calculator that controls the drive motor of the automatic welding machine and the traveling carriage to the selected welding pattern and set intermittent welding pitch, welding length, member length, welding speed, and idle feed speed; and welding equipment.