KR100846116B1 - Spot-welding apparatus with auto sencing function of welding width - Google Patents

Abstract

An electric spot welding apparatus with a function of automatically sensing a welding width is provided to accurately confirm if an electric spot welding operation has been performed well by automatically sensing with of the terminal varied during welding at the same time when mounting the component on the terminal by electric spot welding a lead type component to a terminal of a cooling fan controller body. An electric spot welding apparatus with a function of automatically sensing a welding width comprises: a supporting frame(40) installed at one side of a transfer conveyor(10) for transferring a body(20) having a terminal(21) formed on an inner part thereof in a state that a lead tip(31) of a lead type component(30) is placed on the terminal; a robot part(R) including a Y-axis bar(60) placed on a top face of the supporting frame, and an X-axis bar(50) straightly moved in a state that the X-axis bar is placed on the Y-axis bar in a "T" character shape; a welding part(W) including a transfer base plate, a first hydraulic cylinder, a welding base plate, left and right moving plates, a second hydraulic cylinder, and left and right welding tips; a displacement sensor formed on a top part of the welding base plate to sense moving displacements of sensor terminals contacted during horizontal movement of the left and right moving plates; and a control part for receiving the displacements of the left and right moving plates sensed by the displacement sensor to generate control signals such that electric currents applied to the left and right welding tips are turned on or off, and determining whether the control signals are within a tolerance range of a pre-inputted reference displacement width.

Description

SPOT-WELDING APPARATUS WITH AUTO SENCING FUNCTION OF WELDING WIDTH}

1 is a front view showing an electric spot welding apparatus capable of automatically detecting a welding width according to the present invention;

2 is a plan view showing an electric spot welding apparatus capable of automatically detecting a welding width according to the present invention;

3 is a side view showing an electric spot welding apparatus capable of automatically detecting a welding width according to the present invention;

4 is a plan view showing a welded portion of the electric spot welding apparatus according to the present invention;

5 is a side view showing a welded portion of the electric spot welding apparatus according to the present invention;

Figure 6 is an enlarged schematic diagram showing the main portion showing the operation of the welding portion of the electric spot welding apparatus according to the present invention,

7 is an exploded perspective view illustrating a structure of a general cooling fan controller.

<Description of Symbols for Main Parts of Drawings>

10: conveying conveyor 20: body

21: terminal 30: lead type component element

31: lead end 40: support frame

50: X axis bar 60: Y axis bar

70: feed screw 80: step motor

101: transfer base plate 102: the first hydraulic cylinder

102a: first piston 103: welded base plate

104,105: Left / Right fluid plate 106,107: Left / right welding tip

108: second hydraulic cylinder 108a: second piston

109: displacement sensor 110: sensor terminal

200 control part R: robot part

W: weld

The present invention relates to an electric spot welding apparatus in more detail in the electric spot welding of a lead type component element to a terminal formed on a body that is a component of an automobile cooling fan controller. The present invention relates to an electric welding device capable of automatically detecting a welding width to automatically detect a change and immediately confirm whether the welding condition is good or bad.

In general, the temperature inside a cylinder of an automobile engine is generally higher than 2000 ° C. A large part of this heat is absorbed by the cylinder block, the head, and the piston, and when the temperature of these parts is excessively increased, the cylinder deformation or the cylinder wall Damage to the engine occurs by causing oil film breakage.

In order to prevent engine damage due to such overheating, a cooling device is installed in the engine compartment, and a radiator is provided as a main component of the cooling device. In addition, the radiator is cooled by forced blowing of the cooling fan driven by the electric motor, the operation speed of the cooling fan is controlled by a predetermined controller.

7 is an exploded perspective view illustrating a structure of a general cooling fan controller.

The automotive cooling fan controller, as shown in the drawing, a body (1) in which various lead-type component elements such as varistors and capacitors are embedded, a printed circuit board (printed circuit boards: 2, 3), and It consists of a cover 4 covering the upper surface of the body 1.

In particular, the body 1 is formed with a plurality of terminals 5 on which lead ends of the lead type component elements 6 are seated.

The lead end of the lead type component element 6 is inserted into the terminal 5 of the body to perform electric spot welding.

However, conventionally, when the lead type component device is mounted on the terminal of the body by electric spot welding, the terminal change width during welding is specified, and the terminal change width during welding is automatically detected and compared with the specified terminal change width. In addition, it was not possible to confirm the actual product variation by inspecting only the amount of current.

Therefore, it was not sufficient to accurately check whether the lead type component element mounted on the terminal of the body was well welded by inspecting the amount of current.

Accordingly, the present invention was devised to solve the above problems, and an object of the present invention is to automatically weld (weld) at the same time when mounting a lead-type component element on a terminal of a body of a cooling fan controller. The present invention provides an electric spot welding device capable of automatically detecting a welding width that can accurately check whether a spot welding is performed by detecting a change in the terminal changing time.

A characteristic structure of the present invention for achieving the above object is a support frame provided on one side of the conveying conveyor for transporting the body formed therein the terminal on which the lead end of the lead type component element seated; A robot unit (R) including a Y-axis bar seated on an upper surface of the support frame, and an X-axis bar seated in a T-shape on the Y-axis bar to flow in a straight line; A transfer base plate seated on the X-axis bar and linearly flowable, a first hydraulic cylinder provided on the transfer base plate so that a first piston flows in an up / down direction, and fixed to the first piston The welding base plate is provided on the welding base plate, the left / right flow plate is in contact with the left / right flow and the upper end of the sensor terminal protruding, and the left / right flow plate for the left / right flow plate A second hydraulic cylinder having a second piston provided on the left and right flow plates, and a lower hydraulic cylinder provided at the lower end of the left and right flow plates so that the terminal of the body receives current from an external source. A welding portion (W) portion formed of a left / right welding tip for welding an electric spot together with a lead end of the welding portion; A displacement amount detecting sensor provided at an upper end of the welding base plate to sense a flow displacement amount of the sensor terminal contacted during left / right flow of the left / right flow plate; Receives the displacement of the left / right flow plate detected by the displacement sensor and generates a control signal to turn on / off the current applied to the left / right welding tip, and whether it is within the tolerance of the input reference displacement width And a control unit for discriminating.

In addition, the contact surface facing the left / right welding tip is characterized in that it is formed inclined.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

1 is a front view showing an electric spot welding apparatus capable of automatically detecting a welding width according to the present invention, FIG. 2 is a plan view showing an electric spot welding apparatus capable of automatically detecting a welding width according to the present invention, and FIG. 4 is a side view showing an electric spot welding apparatus capable of automatically detecting a welding width, and FIG. 4 is a plan view showing a welded portion of the electric spot welding apparatus according to the present invention, and FIG. 5 is a side view showing a welded portion of the electric spot welding apparatus according to the present invention. And, Figure 6 is an enlarged schematic diagram showing the operation of the welding portion of the electric spot welding apparatus according to the present invention.

As shown in the drawings, the present invention is provided with a conveying conveyor 10 for transporting the body constituting the cooling fan controller for automobiles. The lead end 31 of the lead type component element 30 is seated on the inner terminal 21 of the body 20 transferred by the transfer conveyor 10.

One side of the conveying conveyor 10 is provided with a support frame 40 having a predetermined height and fixed to the ground. On the upper surface of the support frame 40, the X-axis bar 50 and the Y-axis bar 60 are provided to cross each other in a T-shape, and the X-axis bar 50 is located directly above the conveying conveyor 10. It is seated to flow linearly on the Y-axis bar 60. Therefore, the robot unit R consisting of the X-axis bar 50 and the Y-axis bar 60 is provided.

The linear flow of the X-axis bar 50 is provided with a transfer screw 70 on the Y-axis bar 60, which is commonly used, and provided with a step motor 80 on one side thereof, so that it can be rotated forward / reversely. One end of the X-axis bar 50 is fixed to the nut member fitted to the transfer screw 70 on the Y-axis bar 60, the linear movement of the nut member in accordance with the rotational drive of the stem motor 80 X-axis bar 50 is a linear flow.

On the other hand, the terminal 21 in the body 20 transferred by the conveying conveyor 10 is linearly flowed on the X-axis bar 50 with the lead end 31 of the lead type component element 30 embedded therein. The welding part W for spot welding is provided.

The weld portion W is also provided to flow in a straight line on the X-axis bar 50, which is also a straight line of the nut member by the rotation drive of the feed screw 70 by the drive of the stem motor 80 as mentioned above It is intended to be flow.

The welding part (W) is provided with a transfer base plate (101) which is in direct contact with the X-axis bar (50) and flows in a straight line. The transfer base plate (101) is provided with a first hydraulic cylinder (102) fixed at one side. The welding base plate 103 is fixed to the first piston 102a of the first hydraulic cylinder 102 and vertically flows.

In addition, left and right flow plates 104 and 105 are provided on the welding base plate 103 and are in contact with each other by left and right flow, and the left and right flow plates 104 and 105 are in contact with each other while being left and right flow. The left and right welding tips 106 and 107 which pressurize the terminal 21 of the 20 at both sides and receive electric current from the outside are welded.

The contact surfaces of the left and right welding tips 106 and 107 form an inclined surface that protrudes upward toward the upper side, so that the upper end portion of the body 20 may be pressed more than the lower end portion when the terminal 21 of the body 20 is compressed. In addition, the contact surfaces of the left and right welding tips 106 and 107 are preferably maintained at an inclination of approximately 5 to 10 degrees.

One of the left and right flow plates 104 and 105 is provided with a second hydraulic cylinder 108, and on the opposite side thereof, a second piston 108a of the second hydraulic cylinder 108 is fixed.

Thus, the operation of the second hydraulic cylinder 108 allows the left and right flow plates 104 and 105 to flow left and right with each other.

And, the upper end of the welding base plate 103 is provided with a displacement detection sensor 109 for detecting the flow displacement of the left / right flow plates (104, 105). Sensor terminals 110 that interfere with the displacement sensor 109 are provided at the upper ends of the left and right flow plates 104 and 105, respectively.

On the other hand, the left / right welding tips (106, 107) on / off control the current applied to the left / right welding tips (106, 107) according to the left / right flow distance, that is, the displacement of the left / right flow plates (104, 105) After the electric spot welding of the left and right welding tips 106 and 107 is completed, the displacement width of the left and right flow plates 104 and 105 corresponding to the displacement width of the terminal 21 of the body 20 is measured by the displacement sensor. A control unit 200 is provided which compares the received from 109 within the tolerance of the reference displacement width and determines the good and bad electric spot welding of the terminal 21.

Looking at the function and operation of the present invention configured as described above,

The body 20 by the transfer conveyor 10 in which the lead end 31 of the lead type component device 30 is seated on the terminal 21 of the body 20 of the vehicle cooling fan controller. When is supplied, the X-axis bar 50 of the robot unit (R) and the transfer base plate 101 of the welding portion (W) is transferred so that the welding portion (W) is driven to be located on the upper end of the body (20).

Then, the welding base plate 103 is lowered by the driving of the first hydraulic cylinder 102 so that the terminal 21 of the body 20 to be spot welded is provided on the welding base plate 103. It is positioned between the left and right welding tips 106 and 107 of the plate (104, 105).

Then, the second hydraulic cylinder 108 provided in the left and right flow plates 104 and 105 is driven to flow the left and right flow plates 104 and 105 to the left and right, so that the left and right welding tips 106 and 107 are The terminal 21 of the body 20 is pressed and electric current is applied from the outside to weld the terminal 21 and the lead end 31 to the electric spot.

At this time, by the flow of the left and right flow plates 104 and 105, the sensor terminal 110 provided at the upper end thereof moves in contact with the displacement detection sensor 109, thereby shifting the displacement amount of the left and right flow plates 104 and 105. Will be detected.

That is, the displacement amount of the left and right flow plates 104 and 105 is equal to the change amount of the width of the terminal 21 of the body 20, and thus the left and right flow plates detected by the displacement detection sensor 109. The control unit 200 receiving the displacement amount of the 104 and 105 controls the current applied to the left and right welding tips 106 and 107 in comparison with the change amount of the width of the terminal 21 which is changed before and after the previously input electric spot welding. do.

In other words, when the displacement amount of the left and right flow plates 104 and 105 is equal to or larger than the change amount of the width of the terminal 21 previously input, the control signal is generated to block the current applied to the left and right welding tips 106 and 107. do.

In addition, when the electric spot welding is completed and the terminal 21 is joined to a certain width, the change width of the left and right flow plates 104 and 105 is measured before returning to the original position.

This is compared with the change widths of the left and right flow plates 104 and 105 when the electric spot welding is made to have a good width of the terminal 21, and it is determined whether the electric spot welding is good or bad.

That is, the control unit 200 which receives the change width of the left / right flow plates 104 and 105 when the electric spot welding detected by the displacement sensor 109 is completed is in a state where the electric spot welding previously input is in a good state. Electric spot welding is performed by checking whether the change width of the left and right flow plates 104 and 105 measured in comparison with the change width of the left and right flow plates 104 and 105 is within the change width tolerance of the left and right flow plates 104 and 105 previously inputted. It is determined whether it is good or bad.

An embodiment of the present invention described above should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

As described above, the present invention detects the width change that changes during welding of the terminal and at the same time the terminal width of the lead-type component element to the terminal of the body of the automotive cooling fan controller and the terminal width of the good state already input Compared with the above, there is an advantage that it is possible to immediately check whether the electric spot welding is good or bad.

Therefore, it is possible to detect a bad state easily and quickly without adding a separate process for a separate bad state inspection, thereby minimizing a defective rate and improving work efficiency.

Claims (2)

A support frame 40 provided on one side of the conveying conveyor 10 for conveying the body 20 formed therein with a terminal 21 on which the lead end 31 of the lead type component element 30 is seated; A robot unit (R) including a Y-axis bar (60) seated on an upper surface of the support frame (40), and an X-axis bar (50) seated in a T-shape on the Y-axis bar (60) and flowing linearly; A transfer base plate 101 mounted on the X-axis bar 50 and linearly flowing, and a first piston 102a provided on the transfer base plate 101 so that the first piston 102a flows in an up / down direction. A hydraulic cylinder 102, a welding base plate 103 fixed and fixed to the first piston 102a, and provided on the welding base plate 103 are in contact with each other in left / right flow and at the upper end of the sensor terminal. Left and right flow plates (104, 105) protruding (110) and the second piston provided on the left and right flow plates (104, 105) to flow the left / right flow plates (104, 105) left / right A second hydraulic cylinder 108 having a 108a and a lower end of the left / right flow plates 104 and 105 are provided with a fluid flow and receive a current from the outside to receive the terminal 21 of the body 20. A welding portion (W) portion formed of left and right welding tips 106 and 107 for welding an electric spot together with the lead tip 31 of the lead type component device 30; A displacement detection sensor (109) provided at an upper end of the welding base plate (103) to detect a flow displacement of the sensor terminal (110) contacted during left / right flow of the left / right flow plates (104, 105); Receives the displacement amount of the left and right flow plate 104,105 sensed by the displacement sensor 109 generates a control signal to turn on / off the current applied to the left / right welding tips (106, 107), The welding spot automatic welding device capable of automatically detecting a welding width, characterized in that it comprises a control unit (200) for determining whether it is within a tolerance of a previously input reference displacement width. The method of claim 1, Welding spot automatic welding device capable of automatic welding width, characterized in that the contact surface facing the left / right welding tip (106, 107) is formed to be inclined.

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