JPH06312276A - Resistance welding monitoring device - Google Patents

Abstract

PURPOSE:To provide a resistance welding monitoring device capable of sampling/displaying various welding factors in synchronization with transition of welding conditions with certainty. CONSTITUTION:In the resistance welding monitoring device 1 which measures the various factors on the welding conditions set in a welding machine controller 15 during welding and displays them after welding, a storage part 10, a measuring part 11 which measures the various factors on the welding conditions such as a welding current and the welding pressurizing force, a welded result display part 12, a CPU13, a synchronizing signal input part 14, and I/O port part 16, an external signal output part 17, a timer part 18 and a system bus 19 connected to each part are provided. Every time the synchronizing signal input part 14 receives a synchronizing signal synchronized with transition of the welding conditions from the welding machine controller 15, the CPU13 stores the point of time in the storage part 10 and after welding, a measured value is latched and displayed on the welded result display part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a resistance welding monitoring device for measuring and displaying various elements relating to welding conditions set by a welding machine control device during welding in electric resistance welding or the like.

[0002]

2. Description of the Related Art Generally, in electric resistance welding, pressure is applied to the objects to be welded to be welded to each other, and a welding current is passed. Then, the object to be welded is heated by the Joule heat and melted around the contact surface. Fig. 3 shows the welding current and welding pressure (forward pressure) in such resistance welding.
3 is a time chart showing a control example of the above, and is an example in which the movement amount of the moving portion is used as control conditions for welding current and welding pressure.

In the figure, the moving portion movement amount 0 (time t0) is set at the start of welding current energization, and thereafter, the welding current and welding pressure are applied each time the moving portion movement amount becomes p1, p2, p3, p4. The value of has changed, and such welding conditions are
The optimum value is empirically set in advance in consideration of the material to be welded, the plate thickness, and the like. In addition to using the moving amount of the moving unit as the control condition as described above, the elapsed time may be used as the control condition, or both the moving amount of the moving unit and the elapsed time may be mixed as the control condition.

In the resistance welding as described above, in order to confirm the quality of the welding, the welding current is adjusted according to the welding conditions every time the welding conditions change (t0, t1, t2, t3, t4 in FIG. 3). It is necessary to check whether welding pressure, etc. is supplied, and a resistance welding monitoring device is provided for that purpose. This resistance welding monitoring device is designed to independently set the sampling time of welding current, welding pressure, etc. so as to match (synchronize) with the transition of welding conditions.

However, in recent years, with the diversification of objects to be welded, the setting of welding conditions has been subdivided, and the time required for one-resistance welding is usually 1 second or less, and the unit time during which the welding conditions change is in milliseconds. It's the minimum time. Therefore, it is difficult for the resistance welding monitoring device to independently set the sampling time of the welding current, the welding pressure, and the like that match (synchronize) with the transition of the welding conditions. For example, as shown in FIG. ,
Latch signals L10, L11, L12, L1 for sampling
3 and L14 are originally sections t0 to t1, t1 to t2, t2.
~ T3, t3 ~ t4, t4 ~ should be output in the sections t0 ~ t1, t2 ~ t3, t3 ~ t4, t4.
~, T4 ~, the sampling time is set so that the welding current, welding pressure, etc. in the section t1 ~ t2 may not be sampled, and the transition of welding conditions is surely synchronized. There was a demand for a resistance welding monitoring device that can sample and display by using the above method.

[0006]

SUMMARY OF THE INVENTION The present invention is proposed in view of the above circumstances, and provides a resistance welding monitoring device capable of sampling / displaying various welding elements in synchronization with the transition of welding conditions. The purpose is to

[0007]

A resistance welding monitoring apparatus according to the present invention, which is proposed to achieve the above object, includes various elements relating to welding conditions set in a welding machine control apparatus,
In a resistance welding monitoring device that measures during welding and displays after welding, and outputs an abnormal signal when each measured value is outside the allowable range set value, a storage section, a timer section, an I / O
Port section, setting section for setting allowable range, welding result display section, CPU, measuring section for measuring various elements related to welding conditions such as welding current and welding pressure, and system connected to the above sections The above-mentioned synchronization signal input includes a bus, an external signal output unit connected to the I / O port unit for outputting normal and abnormal signals to the outside, and a synchronization signal input unit for inputting a synchronization signal from the welding machine controller. Whenever the section receives a synchronization signal from the welding machine controller in synchronization with the transition of welding conditions,
The PU stores the time point, and after welding is completed, the measured values of various welding elements are latched and displayed on the welding result display section, and an external signal is output depending on whether each measured value is within or outside the range set by the setting section. The output unit outputs a signal.

[0008]

In the resistance welding monitoring apparatus according to the present invention, each time the synchronizing signal input section receives a synchronizing signal synchronized with the transition of welding conditions from the welding machine controller, the CPU stores the time in the storage section, and the welding is performed. Since the measured values of various welding elements are latched and displayed on the welding result display section after completion, the measured values of various welding elements can be sampled / displayed in synchronization with the transition of welding conditions.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of an embodiment of a resistance welding monitoring apparatus according to the present invention.
In the figure, 10 is a storage unit composed of RAM, ROM, etc., 11 is a measuring unit for measuring various elements related to welding conditions such as welding current and welding pressure, and 12 is for displaying a plurality of sets of sampling values. Welding result display section with display window, 13
Is a CPU of a microcomputer, 14 is a sync signal input section for receiving a sync signal each time welding conditions change, 15 is a welding machine controller, 16 is an I / O port section connecting the sync signal input section and an external signal output section Reference numeral 17 denotes an external signal output unit for outputting a normal or abnormal signal, 18 denotes a timer unit, 20 denotes a setting unit, and 19 denotes a system bus connecting the above-mentioned units other than the welding machine controller 15.

The operation of the resistance welding monitoring apparatus 1 having such a configuration will be described below with reference to examples. Welder controller 15
Indicates the control conditions of the welding current and the welding pressure as the movement amount of the moving portion. As shown in FIG. 2, the movement amounts 0 to p1, p1 to
The welding current and welding pressure are set for each of the sections p2, p2 to p3, p3 to p4. From the time point t0 when the moving part moves, the object to be welded comes into contact and the energization is started, the starting point of the moving amount detection is, and thereafter, the welding machine control device 15 controls the moving amounts of the moving parts to be p1, p2, p3, The synchronizing signals s1, s2, s3, s4, and s5 are output every time when p4 is reached.

On the other hand, in the resistance welding monitoring apparatus 1, the measuring unit 1
1 measures various elements related to welding conditions such as welding current and welding pressure, and the respective values are input to the storage unit 10 via the system bus 19. In the CPU 13, the synchronization signal input section 14 receives the synchronization signal s1 from the welding machine controller 15.
, S2, s3, s4, s5 each time, the storage unit 10 stores the time. Welding result display section 12
Holds (latch) each measured value of various elements related to welding conditions such as welding current and welding pressure, and sequentially displays them in the display window for each group (required group at the end of welding). All minutes are displayed).

In the above description, the welding machine control device 15 uses the control conditions of the welding current and the welding pressure as the movement amount of the moving portion, but this control condition is the elapsed time or the movement amount and the elapsed time of the moving portion. The resistance welding monitor 1 operates in the same manner as long as a similar synchronization signal can be obtained in the mixed type and the other type. Further, in the above embodiment, the alternating current is used as the welding current, but even if the direct current is used, or the welding current by the three-phase low frequency or even the rectangular wave is used, the above It goes without saying that the same thing as the embodiment can be said.

Further, the held (latched) measured values are stored in the storage unit 10 one by one, and after welding work, printed out by a printer (not shown) or displayed on the welding result display unit 12. Is also good.

[0014]

According to the resistance welding monitoring apparatus of the present invention, each time the synchronization signal input section receives a synchronization signal synchronized with the transition of welding conditions from the welding machine control apparatus, the CPU stores the time in the storage section. Since it is stored, the measured values of various welding elements can be sampled / displayed in synchronization with the transition of welding conditions.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of an embodiment of a resistance welding monitoring apparatus according to the present invention.

FIG. 2 is a time chart showing an example of the operation of the resistance welding monitoring apparatus according to the present invention.

FIG. 3 is a time chart showing an example of the operation of the conventional resistance welding monitoring apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resistance welding monitoring device 10 ... Storage unit 11 ... Measuring unit 12 ... Welding result display unit 13 ... CPU 14 ... Synchronous signal input unit 15 ... Welding machine control device 16 ... I / O port section 17 ... External signal output section 18 ... Timer section 19 ... System bus 20 ... Setting section

Claims (1)

[Claims] 1. Various elements relating to welding conditions set in a welding machine controller are measured during welding and displayed after welding is completed, and an abnormal signal is displayed when each measured value is outside the allowable range set value. In the resistance welding monitoring device that outputs, a storage unit,
A timer section, an I / O port section, a setting section for setting an allowable range, a welding result display section, a CPU, and a measuring section for measuring various elements related to welding conditions such as welding current and welding pressure. A system bus connected to each of the above parts, an external signal output part connected to the I / O port part for outputting a normal / abnormal signal to the outside, and a sync signal input part for inputting a sync signal from the welding machine controller. Every time the synchronization signal input section receives a synchronization signal synchronized with the transition of welding conditions from the welding machine controller, the CPU stores the time point, and the measured values of various welding elements are welded after the welding is completed. A resistance welding monitoring device characterized in that the result is latched and displayed on a result display unit, and a signal is output from an external signal output unit depending on whether each measured value is within or outside the range set by the setting unit.