JPH0775784B2 - Resistance welding machine capable of multiple types of welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a resistance welding machine capable of performing a plurality of types of welding, and in particular, a plurality of types capable of appropriately performing a plurality of types of welding. The present invention relates to a resistance welding machine capable of performing various types of welding.

(Problems to be Solved by Conventional Techniques and Inventions) A resistance welding machine is one in which a predetermined current is passed between the objects to be welded and the objects are welded by the current. In this welding, generally, the welding conditions were determined by adjusting the welding current, initial pressing time, energizing time, holding time, and in spot welding, the upslope time.

In particular, in the case of welding a plurality of types of welding with one welding machine, for example, spot welding, projection welding, and welding of objects to be welded having different plate thicknesses by these welding,
The welding conditions depending on whether it is spot welding or projection welding and the welding conditions of the objects to be welded with different plate thicknesses by these weldings are selected from the data table and the intuition of the operator. I was welding a weldment.

Further, in these weldings, constant current control is suitable for spot welding, while on the other hand, voltage compensation control is suitable for projection welding, so that it is necessary to change the current control method.

For this reason, conventionally, there has been a problem that the current control method must be changed depending on the type of welding in addition to the welding conditions, which complicates the work.

These operations take time and the welding conditions,
If the wrong kind of welding is operated, there is a problem that proper welding cannot be performed.

The present invention has been made in order to eliminate the above problems, and an object of the present invention is to obtain a resistance welding machine in which the type of welding is selected depending on the objects to be welded and welding is performed suitable for each object to be welded. It is a thing.

[Structure of Invention]

The present invention is a resistance welding machine capable of welding a plurality of types of objects to be welded, a current control method and welding current set corresponding to a plurality of types of welding, initial pressurization time,
Welding condition setting / storage circuit that stores energization time, holding time, and upslope time, and one type of welding selected from the above-mentioned multiple types of welding according to the selection operation connected to this welding condition setting / storage circuit Welding condition selection switch, a sequence control circuit that forms a sequence control signal for performing welding according to the type of welding selected by the welding condition selection switch from among the plurality of types of welding, and this sequence control circuit From a sequence control signal and a welding current control signal that forms a welding current control signal according to the setting / memorized value from the welding condition setting / memory circuit, and a plurality of welding electrodes according to the signal from the welding current control circuit. A current control switch for controlling the welding current, a sequence control signal from the sequence control circuit, and the welding condition setting / storing time. A pressure signal output circuit that sets the pressure of multiple welding electrodes that perform welding according to the type of welding selected according to the set / stored value from, and a number that is controlled by the output signal of this pressure signal output circuit To obtain a resistance welding machine capable of performing a plurality of types of welding, including a plurality of pressurizing devices that pressurize the welding electrode.

(Operation) First, a plurality of types of welding, such as spot welding and projection welding, are determined. Each data such as welding current, initial pressurization time, energizing time, holding time, up-slope time, etc. according to the type of workpiece to be welded by these types of welding, its plate thickness, etc. is based on past results or experiments Are stored in the welding condition setting / storage circuit.

After performing this setting, when performing welding, the welding conditions and welding conditions suitable for the workpiece to be actually welded, that is, spot welding, projection welding, etc., and welding conditions are selected by the welding condition selection switch. It With this selection, the welding condition data corresponding to the type of welding is set.
It is added from the memory circuit to the welding current control circuit and the pressure signal output circuit.

The welding condition setting / storage circuit gives its output to the sequence control circuit, and gives the sequence control signal from this sequence control circuit to the welding current control circuit and the pressurization signal output circuit.

The welding current control circuit receives the current control method according to the type of welding selected from the welding condition setting / memory circuit and the control signals for welding current, energizing current, energizing time, and upslope time for spot welding. A sequence control signal of the sequence control circuit is received to form a welding control signal.

This control signal is applied to the welding current control signal output circuit to form a signal for controlling the opening and closing of the welding current control switch. The welding current control switch then supplies the selected welding current to the welding electrode.

In addition, the pressurization signal output circuit receives signals for the initial pressurization time, energization time, and holding time according to the type of welding selected from the welding condition setting / storage circuit, as well as the sequence control signals of the sequence control circuit. It receives and operates the pressurization signal output circuit. This pressurizing signal output circuit sends a control signal corresponding to the memory from the initial pressurizing time to the holding time to the pressurizing device corresponding to the type of welding so that the plurality of welding electrodes are suitable for the selected welding. Pressurize.

Therefore, when welding an object to be welded, a welding type suitable for the object to be welded is selected, and welding is performed under welding conditions suitable for the object to be welded.

(Embodiment) An embodiment of a resistance welding machine according to the present invention capable of performing plural kinds of welding will be described with reference to the drawings.

Reference numeral 10 is an AC power source, the output of which is connected to a primary winding 13 of a welding transformer 12 via a welding current control switch 11 such as an SCR. The secondary winding 14 of the welding transformer 12 is connected to a plurality of electrodes for performing a plurality of types of welding, which will be described in detail later, that is, spot welding electrodes 15a and 15b, projection welding electrodes 16a and 16b, etc. To be done.

The control device 17 is provided with a welding condition setting / memory circuit 18. This welding condition setting / memory circuit 18 welds a plurality of types of workpieces 19 and 20, that is, spot welding, projection welding, and welding current corresponding to welding of workpieces having different plate thicknesses by these weldings. , Initial pressurization time, energization time,
For holding time and spot welding, the welding conditions for the upslope time are determined based on past results or experimentally, and these data are set / stored in the welding condition setting / memory circuit 18 such as RAM. To do. The output of the welding condition setting / storage circuit 18 is given to a sequence control circuit 21, which performs sequence control according to a plurality of types of welding, a pressurization signal output circuit 22, and a welding current control circuit 23.

The pressurizing signal output circuit 22 receives the welding condition setting / storing signal of the welding condition setting / storing circuit 18 and the sequence control signal of the sequence control circuit 21, and initializes the pressurizing device 24 or the pressurizing device 25 according to these signals. A signal is applied from the pressurization time to the holding time. As a result, the pressurizing device 24 and the pressurizing device 25 pressurize the spot welding electrodes 15a and 15b and the projection welding electrodes 16a and 16b under given conditions.

On the other hand, the welding current control circuit 23 has a welding condition setting / storage circuit 18
It receives the welding condition setting / storage signal and the sequence control signal of the sequence control circuit 21, and in accordance with these signals, the spot welding electrodes 15a and 15b and the projection welding electrode.
16a, 16b current control method and welding current, energizing time, and in spot welding, a signal corresponding to the up slope time is sent, and this signal is sent from the welding current control signal output circuit 26 to open and close the welding current control. Device 11, eg SC
Welding current control switch by giving firing control signal to R gate 1
The current of 1 is controlled by the selected current control method.

Further, a welding condition selection switch 27 is connected to the welding condition setting / memory circuit 18, and the type of welding such as spot welding or projection welding is selected according to the objects to be welded 19, 20 etc. by the selection operation of the selection switch. The welding data corresponding to is read and used.

FIG. 2 shows an example of the welding current I applied to the spot welding electrodes 15a and 15b, the initial pressurizing time T1, the energizing time T2, the holding time T3, and the upslope time T4.

Next, the operation of the illustrated embodiment will be described. First, the welding condition setting / memory circuit 18 welds plural kinds of workpieces 19 and 20, that is, spot welding, projection welding, and welding current and initial load according to welding of workpieces having different plate thicknesses by these weldings. Pressure time, energization time, holding time, and in spot welding, each welding condition of upslope time is determined by past results or by experimentally determining,
Each of these data is stored.

After this setting is performed, the welding condition selection switch 27 is selected and operated according to the object to be welded, and the type of welding and welding conditions suitable for the object to be welded are selected. This will set the welding conditions
The memory circuit 18 is energized and the sequence control circuit 21 is operated. The welding condition setting / storage circuit 18 selects the welding current, initial pressurization time, energization time, which corresponds to the workpiece to be welded, from among the data set / stored,
Each data of the holding time and the upslope time is sent to the pressurizing signal output circuit 22 and the welding current control circuit 23. Further, the sequence control circuit 21 outputs a sequence control signal for advancing the welding work to the pressurization signal output circuit 22 and the welding current control circuit 23.
Give to.

Now, when the welding condition selection switch 27 selects spot welding, the pressurization signal output circuit 22 outputs the spot welding signal and sequence control circuit 21 from the welding condition setting / memory circuit 18.
In response to the sequence control signal, the pressurizing device 24 is supplied with signals of a predetermined initial pressurizing time and holding time to control the pressurizing device 24 and pressurize the spot welding electrodes 15a and 15b. Therefore, the workpiece 19 is pressed by the pressure applied to the spot welding electrodes 15a and 15b.

On the other hand, the welding current control circuit 23 has a welding condition setting / storage circuit 18
The welding current, the energization time, the upslope time, and the sequence control signal of the sequence control circuit 21 are received according to the data of 1. This welding control signal causes the welding current control signal output circuit 26 to switch the welding current control switch.
11 is controlled, and a welding current suitable for welding the workpiece 19 is supplied from the AC power source 10 to the spot welding electrodes 15a and 15b via the welding transformer 12.

When projection welding is selected by the welding condition selection switch 27, the projection welding electrodes 16a and 16b are pressed and welding is performed in the same manner as in spot welding.

As described above, according to the present invention, a desired welding is selected from a plurality of types of welding by the selection operation of the welding condition selection switch, and at the same time, the welding condition stored / set in the welding condition setting / storage circuit 18 in advance. Since the condition data is read out, it is possible to accurately and promptly perform welding of an appropriate type and an appropriate condition simply by selecting and operating the welding condition selection switch when welding the object to be welded.

In addition to the constant current control and the current control of the voltage compensation control, if a mechanism for simply adjusting only the current by transfer control without receiving feedback of current or voltage is added,
This is effective as a countermeasure when the constant current control or voltage compensation control fails.

〔The invention's effect〕

The present invention is a resistance welding machine capable of welding a plurality of types of objects to be welded, a current control method and welding current set corresponding to a plurality of types of welding, initial pressurization time,
Welding condition setting / storage circuit that stores energization time, holding time, and upslope time, and one type of welding selected from the above-mentioned multiple types of welding according to the selection operation connected to this welding condition setting / storage circuit Welding condition selection switch, a sequence control circuit that forms a sequence control signal for performing welding according to the type of welding selected by the welding condition selection switch from among the plurality of types of welding, and this sequence control circuit From a sequence control signal and a welding current control signal that forms a welding current control signal according to the setting / memorized value from the welding condition setting / memory circuit, and a plurality of welding electrodes according to the signal from the welding current control circuit. A current control switch for controlling the welding current, a sequence control signal from the sequence control circuit, and the welding condition setting / storing time. A pressure signal output circuit that sets the pressure of multiple welding electrodes that perform welding according to the type of welding selected according to the set / stored value from, and a number that is controlled by the output signal of this pressure signal output circuit Since a plurality of pressurizing devices for pressurizing the welding electrode are provided, the object to be welded can be accurately welded by welding of a type suitable for the welding and welding conditions corresponding thereto.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
The figure is a characteristic diagram showing welding conditions of commonly used spot welding. 10 …… AC power supply, 11 …… Welding current control switch, 12 …… Welding transformer, 13 …… Primary winding 13, 14 …… Secondary winding, 15
a, 15b ... Spot welding electrode, 16a, 16b ... Projection welding electrode, 17 ... Control device, 18 ... Welding condition setting / memory circuit, 19,20 ... Welding object, 21 ... Sequence control Circuit, 22 ... Pressure signal output circuit, 23 ... Welding current control circuit, 24,25 ... Pressure device, 26 ... Welding current control signal output circuit, 27 ... Welding condition selection switch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-109583 (JP, A) JP-A-61-150785 (JP, A) Actually opened 61-63387 (JP, U) JP-B 57- 5632 (JP, B2)

Claims (1)

[Claims] 1. In a resistance welding machine capable of welding a plurality of types of objects to be welded, a current control method and welding current set corresponding to the plurality of types of welding, initial pressurization time, and energization time. , Welding time setting / memory circuit for storing holding time and up-slope time, and welding for selecting one kind of welding from the plurality of kinds of welding according to a selection operation connected to the welding condition setting / memory circuit A condition selection switch, a sequence control circuit that forms a sequence control signal for performing welding according to the type of welding selected by the welding condition selection switch from among the plurality of types of welding, and a sequence from this sequence control circuit A welding current control circuit for forming a welding current control signal in accordance with a control signal and a setting / memorized value from the welding condition setting / memory circuit; A current control switch for controlling welding currents of a plurality of welding electrodes according to a signal from a flow control circuit, and a sequence control signal from the sequence control circuit and a setting / memorized value from the welding condition setting / memory circuit. A pressurization signal output circuit that sets the pressing force of a plurality of welding electrodes that perform welding according to the selected welding type, and a plurality of pressurization signal output circuits that pressurize a plurality of welding electrodes controlled by the output signals of the pressurization signal output circuit. A resistance welding machine equipped with a pressure device and capable of performing multiple types of welding.