KR20030024556A - Apparatus for managing spot welding - Google Patents

Abstract

PURPOSE: A spot welding control system is provided to control quality and operation conditions of the spot welding when carrying out resistance spot welding in which steel sheet is folded to de welded as in assembling of a car-body for automobile. CONSTITUTION: The spot welding control system comprises an input part(11) comprising control box interfaced with tact switch(11a) receiving signals inputted through pertinent keys of the LED display part, foot switch, nut sensing device, and starting switch(11b) receiving signals transmitted from welding current detection part and take-off sensing part; a memory part(12) for storing the classified data so that the classified operation function values are easily processed in the control part by classifying data received from the input part into certain operation function values; a control part(13) for operation processing certain data of the memory part and transmitting control signals to the output part and LED display part according to the operation processed resulting values so that the output part and LED display part are controlled; an output part(14) for transmitting control signals according to processing results of the control part received through the relay driving circuit to control box of spot welder; a relay driving part(15) consisted of relay driving circuit to transmit the received control signals to the output part by receiving control signals of the control part; a LED display part(16) for outputting control signals according to processing results of the control part received through the display circuit part using a LED device; a display circuit part(17) consisted of a display indication circuit to transmit the received control signals to a relevant LED device of the LED display part by receiving control signals of the control part; and a power supply part(18) for supplying the converted power supply by converting a power supply into a power supply suitable for the relay driving circuit and various IC (integrated circuits) of the system.

Description

Spot welding management device {APPARATUS FOR MANAGING SPOT WELDING}

The present invention is a technique for preventing the omission of nuts and spots during spot welding, especially in the case of resistance spot welding (hereinafter referred to as spot welding) for overlapping steel sheets such as automobile body assembly, etc. And a spot welding management device for managing a work situation.

In general, in order to join the metal and the metal, the welding is used to remove the interference substances present in the joining portions of two or more base metals, and the welding is frequently used in the welding. Arc welding, gas welding, and electron beam are used. Welding, laser beam welding, electric resistance welding, and the like. In particular, in order to join a plurality of steel sheets such as a vehicle body, welding is performed by using the electric resistance welding method of spot welding. To be bonded.

The spot welding generates heat because the electrical resistance of the contact surface is large when the current to be bonded is sandwiched between the two electrodes, and the contact surface is immediately extinguished, but the temperature of the material increases due to the heat generation. Therefore, the resistance of the base material itself is increased so that the temperature is further increased. The two metal plates are joined together, and copper alloys including steel, light alloys, pure copper for copper alloys, and Cr, Ti, Ni, etc. are used for copper welding. Spot welding is used for various metals such as low carbon steel, high carbon steel, low alloy steel, aluminum and aluminum alloy, stainless steel, tin plate, etc. Not only does it need to drill a rivet hole, but it is also simpler to work with, and the head of the rivet does not appear on the surface. A situation which is mostly commonly used when a cabinet, box, office, or chaje junction of the car.

In particular, due to the rapid development of the automobile industry, automobile parts and body assembly are mainly supplied by suppliers, and companies supplying the vehicle body are using the spot welding machine to join the two metal plates as the base materials. In the spot welding machine, a tip, which is an electrode for localized energization and pressure applied to both sides of the overlapping base metal plate, is installed, and the phenomenon of melting of the base material at the tip of the tip using high heat generated by the high current and the pressing force generated at the tip This happens so that the two metal plates, which are the base materials, are joined.

In general, in order to weld using the spot welder, the foot switch installed in the lower part of the spot welder is operated by a foot to be joined by applying a constant pressure with a high temperature heat of a tip to a joint portion of a metal plate to be joined. The number of spots to be welded is different according to the above, and the welding using the spot welding machine maintains a predetermined number of spots and continuously welds a plurality of products repeatedly. When one work is completed with the missing number of spots and the spot welding of the next base metal plate occurs frequently, such defects cause huge losses to the company.

In order to prevent the loss due to defective products during spot welding, the process of checking the welded product is once again performed, but it is effective to reduce the number of defective products, but it is defective for many products. Since there is not enough to expect a finished product without this, there is a problem that the morale of the worker is lowered due to this, and a burden on the cost due to a separate management staff causes a decrease in work production and management efficiency.

In addition, when the welding operation is repeatedly performed using the spot welder, the tip of the tip is worn out and thickened due to the fusion and adhesion of the base material, and the tip diameter of the tip becomes a predetermined size or more. In order to maintain a constant welding effect, the operator may prevent the tip diameter of the tip from exceeding a certain size because the welding force is lowered because the pressing force and current density of the tip are lowered. Dressing should be done using a dresser. If the tip is no longer available after the prescribed dressing work as described above, the tip should be replaced. For those who need to focus on spot welding, correct tip dressing It is not easy to know the cycle and tip exchange interval accurately, which causes heavy burden on the workers. W is a spot welding work efficiency is lowered, the welding effect is also less a problem.

In order to achieve the above object, the present invention is to provide a point welding management device that can improve the efficiency of work production and management and operator convenience, and can maximize the welding effect due to spot welding.

In order to achieve the above object, the present invention provides a spot switch, a nut feeder, a foot switch and a welding current detector for generating a predetermined signal indicating that a single spot process is performed, and a predetermined signal indicating that a product having a completed welding process is taken out. Spot welding spot welding management provided with a draw detection unit formed at a predetermined part of the product extraction end generating a signal of the product and a nut detecting device for detecting whether the nut supplied through the nut supplier is seated in the correct position when the nut is welded. In the apparatus, the foot switch and the welding current detection unit and the take-out detection unit and the nut sensation device are connected, and the result of the work processing can be displayed, and the remaining welding RBI of the corresponding welding series according to the work progress is displayed. Specify welding series and welding score, display product production quantity and nut welding quantity, welding abnormality, spot missing, nut When more than lock, it informs the welding current by using a LED display and a warning sound and a warning light, it is characterized in that it has the function keys for setting and resetting functions of the respective function.

1 is a schematic block diagram of an entire system for spot welding to which a spot welding management apparatus according to an embodiment of the present invention is applied;

FIG. 2 is a schematic external view of a spot welding management apparatus according to an embodiment of the present invention in FIG. 1.

3 is a detailed block diagram of a spot welding management apparatus according to an embodiment of the present invention in FIG.

4 and 5 are views for explaining the point welding management apparatus using the PLC according to another embodiment of the present invention

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

The present invention is to interface with the control box (3) and the nut feeder (2) of the spot welder (1) in the spot welding joining two metal plates, such as a car body of the automobile or the like to the nut to a predetermined metal plate, By receiving a signal input from the foot switch 4 of the spot welding machine 1, the welding current detection unit 20 and the blowout detection unit 5 provided in the product extraction end to be displayed through the output unit 14 To make it possible for the worker to check the whole process of the point welding process at the same time, it is possible to check immediately when the spot is missing and the nut is missing, and when the product is blown out as described above, the buzzer sound is generated through the warning lamp 19. Take immediate action.

As shown in FIG. 2, the spot welding management apparatus 10 according to the present invention may display a result of processing the control unit 13 using an LED (Light Emitting Diode) element, and the welding according to the work progress. It displays the residual welding score of the series, makes it possible to check the welding series and welding score by the operator's eyes, displays the product production quantity and nut welding quantity of the operator, and informs the tip dressing cycle and tip change interval. When welding abnormality, spot missing, nut missing, current abnormality is notified by LED indication, warning sound and warning light, the operator can check it collectively and omission for setting or resetting function for each displayed part. Function keys such as return, counter stop, alarm stop, counter return, process selection, welding current setting by process, etc. Allows setting according to the margin work.

Hereinafter, a management system for spot welding according to the present invention with reference to the drawings will be described in more detail.

1 is a schematic block diagram of an entire system for spot welding to which a spot welding management apparatus according to an embodiment of the present invention is applied, and FIG. 2 is a spot welding management apparatus according to an embodiment of the present invention in FIG. 1. It is a schematic outline of. 1 and 2, the point welder 1 and the nut feeder 2 are connected to each other to perform spot welding or nut welding of a metal plate under the control of the control box 3, and the welding is performed. The ongoing process allows the operator to collectively check through the LED display unit 16 of the spot welding management device 10, so that the spot welding management device 10 and the control box 3 are interfaced with each other Make it compatible.

One spot process is performed by the operation of the foot switch 4 installed in the lower part of the spot welding machine 1, and the predetermined signal generated by the foot switch 4 is applied to the spot welding management apparatus 10. Input through the start switch (11a) formed in the input unit 11, when the welding process of the exact number of RBI times is completed in accordance with the specified welding RBI, the product is taken out and recognized by the normal welding current detection unit 20 predetermined By transmitting the signal of to the spot welding management device 10, the remaining RBI is initialized to start the welding process for a new product.

If the product is taken out in a missing state compared to the designated welding score, the abnormal welding current detection unit 20 recognizes that the product is taken out and transmits a corresponding signal to the spot welding management apparatus 10. If the spot welding management apparatus 10 receives the signal of the blowout detection unit 5 despite the remaining number of remaining scores, it is determined that the welding is abnormal and indicates that the welding is abnormal on the LED display unit 16, and the missing alarm unit It generates buzzer sound through buzzer and emits a warning light so that the working worker can take immediate action.

When one product is taken out by using the limit sensor 5a or the electron beam sensor 5b, the blowout detection unit 5 gives a predetermined signal to the limit sensor 5a by hand, indicating that the product is taken out. In the case that the spot welding management device 10 is notified or the product for which the welding work is completed through the product extraction end is taken out, it is detected by the electron beam sensor 5b to inform the spot welding management device 10.

In addition, in the case of spot welding the nut supplied through the nut supplier 2 to a predetermined metal plate, the welding process should be performed when the nut is seated at the correct position without detachment, and the spot welding is performed while the nut is not supplied. The upper part of the spot welder 1 may be made so that the nut may be detached or settled in an improper position so that the welding process may be performed and thus a defective product may be manufactured. (6) forms a tip type omission prevention device 6a or a cylinder type omission prevention device 7a on the lower cylinder 7.

The tip type omission prevention device 6a is provided with a difference between the upper tip 6 into which the insulator for spot welding the nut is inserted and the specified predetermined distance between the lower cylinder 7 when welding the nut. When the nut is detected by the absence of the nut to indicate that the nut is missing in the spot welding management device 10, the cylinder type missing prevention device (7a) is installed in a predetermined portion of the lower cylinder (7) when the nut is normally welded By detecting the occurrence of the difference and the specified predetermined interval of the lower cylinder (7) to indicate that the nut welding to the spot welding management device 10 to enable the operator to take immediate action.

3 is an internal configuration diagram of the spot welding management apparatus 10 according to an embodiment of the present invention. As shown in FIG. 3, a predetermined signal transmitted from the spot welding management apparatus 10 and the control box 3 is received through the input unit 11, and stored in the memory unit 12. In accordance with the predetermined process in the control unit 13, according to the processing result of the control unit 13 to drive the relay output through the output unit 14, so that the LED element of the LED display unit 16 to be displayed do.

The input unit 11 converts an electrical signal into an optical signal by using a light emitting diode and transmits the optical signal, and the received optical signal is viewed using a photocoupler that is restored to an electrical signal by a phototransistor. It is possible to convert the power supply suitable for the operation of the device according to the invention and supply it, and to receive a signal input through the selection key of the LED display unit 16 through the tact switch 11a, the control box 3, which is interfaced, Receives the signals transmitted from the nut supplier 2, the foot switch 4 and the welding current detection unit 20 and the extraction detection unit 5 through the start switch (11a) and converts them into signals suitable for the apparatus according to the present invention. Provide it.

The memory unit 12 classifies the data received from the input unit 11 into a predetermined operation function value and stores the data received by the input unit 11 so as to be easily processed by the control unit 13. The controller 13 provides data of a predetermined arithmetic function value, and the controller 13 processes a predetermined data received through the tact switch 11a and the start switch 11b of the input unit 11 using a microprocessor. Subsequently, by transmitting the output signal according to the result of the calculation process to the output unit 14 and the LED display unit 16, the control box is interfaced to the signal input through the selection key of the LED display unit 16 (3) the mutual compatibility is made by the transmission, the LED display unit 16 is able to immediately check the results of the progress of the operator with the eyes.

The output unit 14 receives a signal according to the processing result of the control unit 13, which is received through the relay driving unit 15, which is configured as a relay driving circuit, through a contact point of the relay. By transmitting the corresponding signal to be compatible with each other, but transmits a signal such as welding series, welding score, etc. input by the selection key of the LED display unit 16 to the control box (3) spot welder (1) ) Welds as many times as the number of RBIs according to the welding series, and when the signal of the setting key and the reset key is received from the control box (3), the spot welding machine (1) operates accordingly accordingly. If the spot or nut is missing or abnormality is found during welding, the signal is received from the control box (3) and the spot welder (1) is stopped to take action accordingly. After that, they are interfaced with each other for operation.

The LED display unit 16 transmits a signal according to the processing result of the control unit 13 received through the display circuit unit 17, which is composed of a display display circuit, to the corresponding LED device, the remaining number of RBIs by spot welding, The production quantity and the presence of welding abnormality can be checked immediately as the welding work progresses. Using the SET, RESET and adjustment keys, the operator selects the welding work according to the product and adjusts it arbitrarily. To help.

The power supply unit 18 supplies power required for the spot welding management apparatus 10 according to the present invention, for example, converts the initially supplied power of AC 18V into a power supply of DC 24V for use in a relay drive circuit. In order to use for various ICs, DC 5V power supply can be converted and supplied.

By the above configuration, the spot welding management apparatus according to the features of the present invention can be made.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications and changes may be made without departing from the scope of the present invention. For example, in the above description, the controller of the present invention is described as using a microprocessor. However, the controller of the present invention may be configured using a dedicated PLC. 4 is a circuit diagram of a switch and a lamp for displaying and driving various types of information when using PLC. FIG. 5 shows an example of various inputs and outputs of PLC. Therefore, the scope of the present invention should not be defined by the described embodiments, but by the equivalents of the claims and claims.

As described above, the present invention can improve work production and management efficiency and operator convenience, reduce resources, reduce production costs, and reduce company losses, and maximize welding effects due to spot welding.

Claims (3)

A spot welder, a nut feeder, a foot switch and a welding current detector for generating a predetermined signal informing that a single spot process is performed, and a product extraction end for generating a predetermined signal informing that a product having completed the welding process is taken out. In the spot welding point welding management device having a blowout detection unit formed in the portion of the portion and the nut detection device for detecting whether the nut supplied through the nut supplier is seated in place when welding the nut, It is connected with the foot switch, the welding current detection unit, the extraction detection unit, and the nut sensation device, to display the results according to the work processing, to display the remaining welding RBI of the corresponding welding series according to the work progress, the welding sequence and It designates the welding score and displays the product production quantity and nut welding quantity.In case of welding abnormality, spot missing, nut leakage, welding current abnormality, it is notified by LED indication, warning sound and warning lights. Point welding management apparatus characterized in that it comprises a function key for. According to claim 1, The spot welding management device An input unit comprising a control box interfaced with a tact switch receiving a signal input through a corresponding key of the LED display unit, a foot switch, a nut detection device, a welding current detection unit, and a start switch receiving a signal transmitted from a blowout detection unit; A memory unit for classifying the data received by the input unit into a predetermined operation function value and storing the data for easy processing by the controller; A control unit which performs arithmetic processing on predetermined data of the memory unit and transmits and controls a control signal according to the result of the arithmetic processing to an output unit and an LED display unit; An output unit for transmitting a control signal according to the processing result of the control unit received through the relay driver to a control box of a spot welding machine; A relay driver configured to receive a control signal from the controller and transmit the control signal to the output unit; An LED display unit for outputting a control signal according to a processing result of the control unit received through the display circuit unit using an LED element; A display circuit configured to receive a control signal from the controller and transmit the received control signal to a corresponding LED device of the LED display; And a power supply unit for converting and supplying the relay driving circuit of the device to a suitable power source for various ICs. The display device of claim 2, wherein the LED display unit displays the remaining RBI, welding RB, welding sequence, production quantity, welding abnormality, RBI spot, welding current abnormality, nut leakage, power supply status and welding completion through the LED device. And a power key, a setting key for setting a state of the display module and a reset key, and an adjusting key for adjusting the set number.