JP5403656B2 - Seam welding power control device, seam welding method and seam welding device - Google Patents

Description

  The present invention relates to a seam welding power control device and the like that can improve welding quality and can easily perform seam welding of particularly small electronic components in seam welding of electronic components.

  2. Description of the Related Art Conventionally, when an electronic component package typified by a crystal resonator or the like is welded, a seam welding technique is used in which a welding current is applied to the electronic component package using a pair of welding rollers. In this seam welding, as shown in FIG. 7, Joule heat generated at the input side welding edge L on the side where current flows into the electronic component package 100 by the welding roller 32 and the output side welding edge M on the side where current flows out. Since there is a difference in Joule heat, the welding state differs between the input side welding edge L side and the output side welding edge M side. In order to solve such a problem, each welding spot is formed by applying a welding current consisting of a pair of positive and negative pulses, so that each welding spot has a gap between the input side welding edge L and the output side welding edge M. There has been proposed a technique for making the same welding conditions (see, for example, Patent Document 1).

JP-A-9-206957

  However, in recent years, electronic components have become high performance and the size of the electronic components themselves has been reduced, and seam welding may have to be performed in a very narrow range. However, since the technique disclosed in Patent Document 1 applies a pair of pulses consisting of a positive pulse and a negative pulse to each welding spot, the application time of current at each welding spot becomes longer, and one welding spot is obtained. There was a problem that the melting range in the slab was enlarged.

  In view of such circumstances, the present invention is intended to provide a seam welding power control device, a seam welding method, and a seam welding device that are particularly suitable for seam welding of small electronic components.

  The above-mentioned object is achieved by the following means based on the earnest research of the present inventors.

The present invention relates to a power control device for seam welding in a seam welding apparatus for seam welding an electronic component by applying a welding current to a welding roller, and a power converter for converting an AC voltage to a DC voltage, and applying a positive current A positive pulse application period, a first cooling period in which the current is maintained at substantially zero continuously during the positive pulse application period, a negative pulse application period in which a negative current is applied continuously in the first cooling period, The second cooling period in which the current is maintained at substantially zero continuously in the pulse application period is repeated in this order, and the current control unit that supplies the DC voltage to the welding roller and the DC voltage of the power conversion unit are determined. A stabilization unit that performs voltage control, and a time adjustment unit that arbitrarily changes at least one of the positive pulse application period, the first cooling period, the negative pulse application period, and the second cooling period, Current control Said first and second cooling period in section is characterized in that the welding roller is set on a movable time to a next welding position on said electronic component.

The stabilizing unit preferably has a variable voltage level for constant voltage control. Moreover, it is preferable that the moving distance of the welding roller in the first and second cooling periods is within a range in which the electronic component is melted by the application of the positive current or the negative current immediately before.

The present invention also provides a seam welding method for seam welding an electronic component by applying a welding current to a welding roller, wherein the current conversion step converts an AC voltage into a DC voltage, and the direct current converted by the current conversion step. A positive pulse applying step of applying a positive current to the welding roller using a voltage; a first cooling step of maintaining the current of the welding roller at substantially zero in succession to the positive pulse applying step; A negative pulse applying step of applying a negative current to the welding roller continuously to the first cooling step; a second cooling step of maintaining the current of the welding roller to be substantially zero continuously to the negative pulse applying step; A first moving process in which the welding roller is relatively moved on the electronic component in the first cooling step, and a second movement step in which the welding roller is relatively moved on the electronic component in the second cooling step. And travel And wherein the Rukoto.

It is preferable to further comprise a stabilization step of making the DC voltage a constant voltage. In the stabilization step, the constant voltage level is preferably variable. Furthermore, it is preferable to further include a time adjustment step for arbitrarily changing at least one of the positive pulse application period, the first cooling period, the negative pulse application period, and the second cooling period. In addition, it is preferable that the movement of the welding roller by the first or second moving stroke is within a range in which the electronic component is melted by the application of the positive current or the negative current immediately before.

Furthermore, the present invention includes a pair of roller electrodes, a welding roller moving unit that moves the roller electrode to an arbitrary position of an electronic component, and the seam welding power control device. , Seam welding equipment.

  ADVANTAGE OF THE INVENTION According to this invention, the welding quality in the seam welding of an electronic component can be improved, and it becomes possible to aim at the quality improvement of the seam welding of especially a small electronic component.

1 is an overall configuration diagram showing a seam welding device according to a first embodiment of the present invention. It is a block diagram which shows the circuit structure of the stabilization power supply part and current control part of the seam welding apparatus. It is a wave form diagram of the welding current output from the pulse generation part of the current control part of the seam welding apparatus. It is the schematic which shows the direction of the welding current applied to the welding roller of the seam welding apparatus seen from the upper direction, and the state of the movement of a welding roller. It is the schematic which shows the welding current of the seam welding apparatus, and the welding state of an electronic component package. It is a wave form diagram of welding current outputted from a pulse generation part concerning other embodiments. It is the elements on larger scale near the welding roller and electronic component package which show the conventional welding method.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  <Overall configuration>

  FIG. 1 shows an overall configuration of a seam welding apparatus 1 according to a first embodiment of the present invention.

  The seam welding apparatus 1 includes a main body side holding mechanism 10 which is a welding roller moving means, a seam welding roller unit 30 which is detachably held by the main body side holding mechanism 10, a seam welding power control apparatus 50, a workpiece And a welding table 70 on which the electronic component package 100 to be mounted is mounted. Further, the seam welding power control device 50 includes a power conversion unit 60 that converts an AC voltage into a DC voltage, and a DC voltage output from the power conversion unit 60 into an arbitrary positive current or negative current to convert the welding roller 32 is provided with a current control unit 80 for supplying the current to 32. The seam welding roller unit 30 holds the welding roller 32 rotatably.

  The main body side holding mechanism 10 is disposed at the upper ends of the vertical slider 14 and the left and right vertical sliders 14 that guide the pair of seam welding roller units 30 to be movable in the vertical direction (Z direction). A horizontal slider 16 that moves in the X direction), a basic slider 18 that moves the horizontal slider 16 up and down, and a Y direction that moves the basic slider 18 in the vertical direction and the direction perpendicular to the left and right directions (front and back). A moving slider (not shown) is provided.

  The pair of vertical sliders 14 are independent from each other, and is loaded with a biasing means such as a spring (not shown). Therefore, the vertical slider 14 presses the welding roller 32 with a predetermined load against the electronic component package 100 and the like, and moves each welding roller 32 up and down independently. For example, when the electronic component package 100 is deformed or an error occurs in the fixed state of the electronic component package, each welding roller 32 individually moves up and down to absorb the error.

  The horizontal slider 16 freely adjusts the relative distance between the left and right seam welding roller units 30. Therefore, the interval between the welding rollers 32 can be matched to the electronic component package 100 having various widths.

  Further, since the Y-direction moving slider (not shown) can move the basic slider 18 forward and backward (Y direction), the welding roller 32 can be moved along one side of the electronic component package 100. .

  FIG. 2 is a block diagram showing the configuration of the seam welding power control apparatus 50.

  As described above, the seam welding power control device 50 includes the power conversion unit 60 and the current control unit 80.

  The power converter 60 is a power converter that converts an AC voltage into a DC voltage. Specifically, the power conversion unit 60 includes rectifying means 62 that rectifies an AC voltage into a DC voltage by a combination of diodes. In the present embodiment, as shown in the figure, the power converter 60 stabilizes the direct current voltage rectified by the rectifier 62 to a predetermined voltage value and current value (hereinafter referred to as DC-DC). Converter 64). As a result, the voltage value output from the power converter 60 is always stable.

  The current control unit 80 converts the DC voltage stabilized by the power supply conversion unit 60 into a pulsed current composed of a positive current and a negative current.

  The current control unit 80 can vary the voltage level and the voltage output time. Specifically, the current control unit 80 sets a positive current, a negative current voltage level, a current output ON time, and an output OFF time (the output OFF time is referred to as a first cooling period and a second cooling period). An adjustment unit 82 and a pulse generation unit 84 that converts a DC voltage supplied from the power supply conversion unit 60 into a pulsed current according to the conditions set by the time adjustment unit 82 are provided. The pulse current generated by the pulse generator 84 is supplied to the pair of welding rollers 32 through a predetermined conductive path F.

  Next, the welding current I generated by the pulse generator 84 will be described.

  As described above, the welding current I output from the pulse generator 84 of the current controller 80 to the welding roller 32 is substantially equal to the positive pulse application period ST in which the positive current is applied and the positive pulse application period ST. It is a pulsed current that repeats a first cooling period RT1 that is maintained at zero, a negative pulse application period FT that applies a negative current, and a second cooling period RT2 that is maintained substantially zero following the negative pulse application period FT ( (See FIG. 3).

  In the present embodiment, the current applied in the first cooling period RT1 and the second cooling period RT2 is approximately 0 A, and the case where a welding current of 100 A flows in the positive pulse application period ST and −100 A flows in the negative pulse application period FT. Show. Further, in the figure, it means that the direction of current flow is different between the positive pulse application period ST and the negative pulse application period FT. For example, FIG. 4 is an enlarged front view showing the welding roller 32 and the electronic component package 100 as viewed from above. In the positive pulse application period ST, current flows from the left welding roller 32A through the electronic component package 100 to the right welding roller 32B (arrow A direction), and in the first cooling period RT1, the welding roller 32 moves in the arrow E1 direction. In the subsequent negative pulse application period FT, a current flows from the right welding roller 32B to the left welding roller 32A (in the direction of arrow B) via the electronic component package 100. In the subsequent second cooling period RT2, the welding roller 32 further moves in the direction of arrow E2. Each current generates Joule heat between the left welding roller 32A and the electronic component package 100 and between the right welding roller and the electronic component package 100, and the ceramic container 110 constituting the electronic component package 100 and a lid serving as a lid 120 is seam welded.

  In the present embodiment, when forming one welding spot, a pair of welding currents composed of a positive current and a negative current is not applied. Therefore, the welding range (welding spot) formed in the positive pulse application period ST and the negative pulse application period FT is not uniform at the pair of both edges of the electronic component package 100.

  As can be seen from the above description, the moving distance E1 of the welding roller 32 in the first cooling period RT1 is determined by the welding spot formed in the positive pulse application period ST and the welding spot formed in the negative pulse application period FT. It is set to the extent that it overlaps sufficiently. By doing in this way, the welding area | region of the electronic component package 100 can be fuse | melted uniformly by the welding roller 32, and the improvement of welding quality and welding strength can be aimed at.

  FIG. 5 exemplifies a case of welding seven locations along one side of the electronic component package 100 with the positive pulse application period ST set to a total of four times and the negative pulse application period FT set to a total of three times. Yes.

  In addition, the heating region K1 indicated by the thin oblique lines in the figure schematically represents a range in which the electronic component package 100 (lid 120) is heated by the positive pulse application period ST or the negative pulse application period FT. The melting portion K2 schematically represents the shape and range of the portion (nugget) where the ceramic container 110 and the lid 120 are joined by this heating.

  As described above, the heating region K1 by the welding roller 32 has a wide current flowing side and a small flowing side. This is because the amount of heat generated when the current flows in the order of the welding roller 32, the lid 120 material, and the ceramic container 110 material, and the amount of heat generated when the current flows in the order of the ceramic container 110 material, the lid 120 material, and the welding roller 32 are This is due to differences in effect (Peltier effect). For this reason, the Joule heat on the flow-out side (right welding roller 32B side) is lower than the Joule heat on the current-flow side (left welding roller 32A side), and therefore, the welding part K2 also has a wider current-flow side, The side from which current flows out becomes smaller.

  On the other hand, in the present embodiment, the welded portion K2 is intentionally left asymmetric in each of the positive pulse application period ST or the negative pulse application period FT at the pair of edges in the electronic component package 100 as described above. However, by alternately securing the positive pulse application period ST and the negative pulse application period FT while leaving a cooling period, it is possible to overlap adjacent welds K2 as a result. Yes.

  <Seam welding method>

  Next, a seam welding method using the seam welding apparatus 1 will be described. First, as a power source conversion step, an AC voltage supplied from the outside by a power source converter is converted into a DC voltage. The converted DC voltage is supplied to the welding roller 32.

  Next, as a positive pulse application step, a positive current is applied to the welding roller 32 during the positive pulse application period ST. Specifically, a current is supplied from the pulse generator 84 of the current controller 80 in the direction from the left welding roller 32A to the right welding roller 32B (arrow A direction).

  Next, as a first cooling step subsequent to the positive pulse applying step, a current of approximately 0 mA is passed through the welding roller 32 (the voltage is reduced to zero) during the first cooling period RT1.

  During the first cooling period RT1, the first movement stroke is performed. That is, the welding roller 32 is moved to the next welding position during the first cooling period RT1.

  Next, a negative current is applied to the welding roller 32 during the negative pulse application period FT as a negative pulse application step that is continuous with the first cooling step. Specifically, a current is supplied from the pulse generator 84 of the current controller 80 in the direction from the right welding roller 32B to the left welding roller 32A (arrow B direction).

  Next, as a second cooling step subsequent to the negative pulse applying step, a current of approximately 0 mA is passed through the welding roller 32 (the voltage is reduced to zero) during the second cooling period RT2.

  During the second cooling period RT2, the second movement stroke is performed. That is, the welding roller 32 is moved to the next welding position during the second cooling period RT2. Seam welding is completed by repeatedly performing the positive pulse applying process to the second moving process.

  As described above, each side of the electronic component package 100 is surely seam-welded by alternately applying a positive current and a negative current at intervals of a plurality of welding positions on one side of the electronic component package 100. be able to. In other words, by alternately applying a positive current and a negative current at different positions of the electronic component package 100, it is possible to prevent only one of the left welding roller 32A side and the right welding roller 32B side from melting much. it can. Further, by applying one of positive current and negative current at each welding position, the melting range at one place can be reduced. As a result, even in a small electronic component, the number of welding spots can be increased, and the welding quality and welding strength can be improved.

  The first cooling period RT1 and the second cooling period RT2 in the current control unit 80 are set so that the welding roller 32 moves to the next welding position on the electronic component package 100. Therefore, after the welding roller 32 has moved to the next welding position with certainty, the electronic component package 100 can be seam welded by passing a positive current or a negative current.

  The seam welding power control device 50 further includes a stabilization unit (DC-DC converter 64) that stably controls the DC voltage converted by the rectifying means 62 of the power conversion unit 60 to a predetermined constant voltage and constant current. I have. Therefore, the voltage or current output from the current control unit 80 and supplied to the welding roller 32 is stabilized, and the welding roller 32 can always perform stable seam welding under substantially the same conditions.

  Further, the DC-DC converter 64 can change the voltage level for constant voltage control and set it to an arbitrary value. Therefore, the voltage level supplied to the welding roller 32 can be freely adjusted according to the material and size of the electronic component package 100 to be welded.

  In addition, the time adjustment unit 82 of the current control unit 80 can arbitrarily set at least one of the positive pulse application period ST, the first cooling period RT1, the negative pulse application period FT, and the second cooling period RT2. The time adjustment unit 82 allows the seam welding power control apparatus 50 to freely adjust the welding conditions depending on the size of the electronic component package 100 to be welded.

  Further, the moving distance of the welding roller 32 in the first cooling period RT1 and the second cooling period RT2 is set so that adjacent welded portions K2 overlap each other by applying a positive current or a negative current to the welding roller 32. Thereby, it can weld uniformly over substantially the whole range of the welding area | region of the electronic component package 100 periphery.

  In addition, the waveform of the current in the present invention is not limited to the rectangular wave of the present embodiment, and for example, a sawtooth wave, a triangular wave, a sine wave, or other waveforms are also preferable.

  In addition, as shown in FIG. 6, it is preferable that a preheating period YT1 is provided continuously after the positive pulse application period ST and a preheating period YT2 is provided continuously after the negative pulse application period FT. In this preheating period, a voltage level pulse is applied as compared with other periods. As described above, by preheating the electronic component package 100, it is possible to appropriately control the shape of the welded portion K2 or to form a uniform strip as a whole.

  The seam welding pulse control device and the seam welding device pulse control method of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Of course.

  The present invention can be applied to various purposes for performing seam welding.

DESCRIPTION OF SYMBOLS 1 Seam welding apparatus 10 Main body side holding mechanism 14 Vertical slider 16 Horizontal slider 18 Foundation slider 30 Seam welding roller unit 32 Welding roller 50 Seam welding power control device 60 Stabilizing power supply unit 70 Welding table 80 Current control unit 100 Electronic component package 110 Ceramic container 120 lid

Claims (9)

A power control device for seam welding in a seam welding device for seam welding an electronic component by applying a welding current to a welding roller,
A power converter that converts AC voltage to DC voltage;
A positive pulse application period for applying a positive current, a first cooling period for maintaining the current at substantially zero continuously for the positive pulse application period, and a negative pulse application for applying a negative current for the first cooling period A current control unit for supplying the DC voltage to the welding roller by repeating a period, a second cooling period in which the current is maintained at substantially zero continuously in the negative pulse application period, in this order;
A stabilizing unit that performs constant voltage control of the DC voltage of the power conversion unit;
A time adjustment unit that arbitrarily changes at least one of the positive pulse application period, the first cooling period, the negative pulse application period, and the second cooling period;
The first and second cooling periods in the current control unit are set to a time during which the welding roller can move to the next welding position on the electronic component. . The seam welding power control apparatus according to claim 1 , wherein the stabilizing unit has a variable voltage level for constant voltage control. The moving distance of the welding roller in the first and second cooling periods is within a range in which the electronic component is melted by the application of the positive current or the negative current immediately before,
The power control apparatus for seam welding according to claim 1 or 2 . A seam welding method for seam welding an electronic component by applying a welding current to a welding roller,
A current conversion step of converting alternating voltage into direct voltage;
A positive pulse application step of applying a positive current to the welding roller using a DC voltage converted by the current conversion step;
A first cooling step of maintaining the current of the welding roller at substantially zero continuously with the positive pulse applying step;
A negative pulse applying step of applying a negative current to the welding roller continuously to the first cooling step;
A second cooling step of maintaining the current of the welding roller at substantially zero following the negative pulse applying step;
A first movement step that is performed in the first cooling step and relatively moves the welding roller on the electronic component;
A second movement step performed in the second cooling step to relatively move the welding roller on the electronic component;
A seam welding method characterized by comprising: The method further comprises a stabilization step of making the DC voltage a constant voltage.
The seam welding method according to claim 4 . In the stabilization step, the constant voltage level is variable,
The seam welding method according to claim 5 . A time adjustment step of arbitrarily changing at least one of the positive pulse application period, the first cooling period, the negative pulse application period, and the second cooling period,
The seam welding method according to any one of claims 4 to 6 . The movement of the welding roller by the first or second movement stroke is within a range in which the electronic component is melted by the application of the positive current or the negative current immediately before,
The seam welding method according to claim 4 . A pair of roller electrodes;
Welding roller moving means for moving the roller electrode to an arbitrary position of the electronic component;
The seam welding power control device according to any one of claims 1 to 3 ,
A seam welding apparatus comprising:

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