JP2517143Y2 - Current waveform display for spot welder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an energization waveform display device for a spot welder that displays a waveform of a welding current when energizing the spot welder.

(Prior Art) Conventionally, a spot welder is a device that superimposes two or three plates to be welded, sandwiches them between upper and lower electrode tips, and performs spot welding through a welding current. The welding work is carried out by setting the current, the energization time, and the like.

(Problems to be solved by the invention) By the way, even if the set value of the welding current is the same, the energization waveform and the peak current value differ depending on various conditions such as the material of the plate material, the plate thickness, and the welding margin. Therefore, in order to actually study the energizing current and the energizing waveform, it was necessary to equip an appropriate measuring instrument. However, with conventional spot welders,
It is expensive to select and equip a measuring device, and there are many problems to be solved in setting various conditions and quality control while comparing the set value with the current actually applied.

In order to solve the above problems, the purpose of the present invention is to compare the set value with the current that is actually supplied, and to set various conditions and to easily control the quality of the spot welding machine. It is to provide a display device.

[Structure of the Invention] (Means for Solving the Problems) In view of the conventional problems as described above, the present invention includes a current detection unit that detects a welding current during energization in a spot welding machine. An energization waveform display section that displays the energization waveform detected by, a current peak display section that numerically displays the current peak of the energization waveform, and an arrival time that numerically displays the arrival time from the start of energization until the current peak is reached. Display part, product number, product name entered from the input part,
And a data display section for displaying data such as material and plate thickness.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a front view of a spot welding machine in which the present invention is implemented, and FIG. 4 is a side view of the same. The spot welder 1 starts up by stacking two or three plates (not shown) to be welded and sandwiching them between the upper and lower electrode tips 7 and 9 provided on the upper and lower electrode rods 3 and 5. It is a device for spot welding by passing an electric current by stepping on a switch (not shown). At this time, the upper electrode rod 3 was vertically attached downward to the electrode rod gripping portion 13 of the upper support 11 provided in the spot welding machine 1 and fixed by the fixing screw 15.

On the other hand, the lower electrode rod 5 is vertically supported by the tip of the lower horn 17.

The lower horn 17 is provided on a horn fixing metal fitting 21 on a lower support 19 provided on the spot welding machine 1 so as to be slidable in the front-rear direction. After positioning the lower electrode rod 5 so that the lower electrode tip 9 faces upward and faces the upper electrode tip 7, the lower horn 17 is attached to the horn fixing metal fitting 21.
It is fixed by a fixing screw 23 provided on the.

The energization waveform display device 25 is separately installed in the spot welding machine 1, and the energization waveform, current peak, arrival time or other set value, management data, etc. when energized by the start switch is displayed on the monitor image device 27. A display device 29 is an input unit for inputting set values and the like.

FIG. 1 is a block diagram of an energization waveform display device according to an embodiment of the present invention, and FIG. 2 is a schematic explanatory diagram of the monitor image device in FIG. In the figure, the energization waveform display device 25 is
It is a microcomputer mainly composed of an arithmetic processing unit (DPU) 31, a memory unit 33, a clock unit 35, an input unit 37, an I / O interface unit 39, a current detector 41 and a monitor image device 27. The current detector 41 is a toroidal coil for secondary current detection that detects a welding current.

Further, the CPU 31 calculates the energization waveform based on the secondary current by the current detector 41, the highest current peak in the energization waveform, and the arrival time from the start of energization to the current peak. Then, while storing in the memory unit 33,
Output to the monitor image device 27 via the I / O interface 39.

The monitor image device 27 displays the energization waveform on the energization waveform display unit 43, digitally displays the current peak on the current peak display unit 45, and digitally displays the arrival time on the arrival time display unit 47. The clock unit 35 is a reference time when calculating the arrival time.

Further, the input unit 37 inputs various setting values, for example, the product number, product name, material, plate thickness, electrode setting or production number, number of dots, dress preset and count to the CPU 31,
The set value and other data are digitally displayed on the other data display section 49 of the monitor image device 27.

In this way, the spot welding machine 1 is provided with a current waveform display device 25.
By installing, the energization waveform after the energization by the start switch is displayed, and at the same time, the current peak and the arrival time are displayed, so the energization is visually confirmed,
Differences from the set values due to various conditions such as plate material, plate thickness, and welding margin have been confirmed, and the effect on quality control is extremely large.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in other modes by making appropriate design changes.

[Effects of the Invention] As will be understood from the above description of the embodiments, in short, the present invention is provided with a current detection unit (41) for detecting a welding current during energization in a spot welding machine. An energization waveform display section (43) that displays the energization waveform detected by 41), a current peak display section (45) that numerically displays the current peak of the energization waveform, and a current peak from the start of energization until the current peak is reached. An arrival time display unit (47) for numerically displaying the arrival time and a data display unit (49) for displaying data such as the product number, product name, material, and plate thickness input from the input unit (37). It is a thing.

As is apparent from the above configuration, in the present invention, the energization waveform detected by the current detection unit 41 is the energization waveform display unit.
Displayed on 43, the peak value of the displayed energization waveform and the arrival time from the start of energization to the peak value are respectively displayed numerically, and the data input from the input section is also displayed on the data display section. Is.

Therefore, according to the present invention, the pattern of the energization waveform can be visually observed, the peak value and the arrival time at that time can be easily known, and the data display unit 49
It is possible to confirm whether or not the data setting is appropriate by comparing with the input data and the like displayed in.
That is, the welding quality can be easily controlled.

[Brief description of drawings]

FIG. 1 is a block diagram of an energization waveform display device according to an embodiment of the present invention, FIG. 2 is a schematic explanatory diagram of a monitor imager in FIG. 1, and FIG. 3 is a spot welding machine in which the present invention is implemented. The front view and FIG. 4 are also side views. 1 ... Spot welder 25 ... Energization waveform display device 27 ... Monitor image device, 31 ... CPU 33 ... Memory, 37 ... Input section 41 ... Current detector, 43 ... Energization waveform display section 45 ... Current peak display section, 47 ... Arrival Time display 49 ... Other data display

Claims (1)

(57) [Scope of utility model registration request] 1. A current detection section (41) for detecting a welding current during energization in a spot welding machine, and an energization waveform display section (43) for displaying an energization waveform detected by the current detection section (41), A current peak display section (45) that numerically displays the current peak of the energization waveform, an arrival time display section (47) that numerically displays the arrival time from the start of energization until the current peak is reached, and an input section (37). ) The product number entered from
A current waveform display device for a spot welding machine, comprising: a data display section (49) for displaying data such as product name, material, and plate thickness.