JP2006095571A - Roller electrode for seam welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that there is the possibility of the generation of cracks in the vicinity of a joint on the side of a vessel under the influence of the heat because it is generally performed to increase the value of impressed current at welding in order to surely perform welding in seam welding in conventional technique, but heat generated at welding is increased and the amount of heat is also increased when the current value is increased. <P>SOLUTION: In a roller electrode for seam welding, at least one groove part which reaches the inside side face from the outside side face of the roller electrode is formed on the contacting/energizing surface of the roller electrode in this roller electrode for seam welding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roller electrode used for seam welding.

  Conventionally, various electronic components have been used in electronic devices such as portable communication devices. Among them, piezoelectric vibrators and piezoelectric oscillators, which are one of the electronic components used as a reference signal generation source, are electronic elements. A piezoelectric diaphragm is mounted inside the package and hermetically sealed with a lid. Generally, seam welding is used in a hermetic sealing process of an electronic component package in which an electronic element is mounted.

  FIG. 4 illustrates a form of seam welding in a conventional roller electrode. That is, when the metal lid 42 covering the entire opening of the internal space formed in the rectangular container 41 is welded to the container 41 and the internal space of the container 41 is hermetically sealed, the container 41 and the lid A current is applied between the electrodes while a pair of electrodes 43 in the form of a roller is brought into contact with a welded portion (two opposing edge portions 42a of the lid 42) with the body 42, and the container 41 is further moved in the direction of arrow A. Due to the rotation of the roller electrode 43 by the movement, the welded portion between the container 41 and the lid body 42 is continuously welded.

  As a form of the roller electrode 43 used for such seam welding, a constant taper angle is formed on the contact energizing surface 44 by decreasing the inner diameter of the roller toward the outside of the electrode, and the contact energizing surface. 44 is a flat surface.

  The following prior art documents are known for such seam welding roller electrodes.

JP 2003-53550 A JP 2003-340576 A

  The applicant has not found any prior art documents related to the present invention other than the prior art documents specified by the prior art document information described above by the time of filing of the present application.

  As described in the background art described above, in the conventional electronic component package, as a means for hermetically sealing the insulating container and the lid, there is a method of joining the edge of the lid and the container by seam welding. It is used. The contact energization surface of the roller electrode used at this time is flat. During welding, the applied current value, the rotation speed of the roller electrode serving as a welder, the pressure value applied to the welded portion by the roller electrode, Work after optimizing seam welding conditions.

  However, in order to ensure hermetic sealing, it is common practice to increase the current value applied between the roller electrodes. However, if the current value is increased, the heat generated during welding increases and the amount of heat increases. For this reason, there is a possibility that cracks may occur in the vicinity of the joint portion on the container side due to these effects. In order to avoid such problems, as a method of reducing the heat generated while increasing the applied current value during welding and reducing the amount of heat, a welding energized state and a cooling non-energized state are alternately formed during welding. Although a method using a so-called half-wave energization method is sometimes used, it is difficult to derive an optimum seam welding condition as the electronic component package is miniaturized. However, it is difficult to prevent the occurrence of poor hermetic sealing.

  In order to solve the above problems, the seam welding roller electrode of the present invention is a seam welding roller electrode in which at least one groove portion extending from the outer side surface to the inner side surface of the roller electrode is formed on the contact energizing surface of the roller electrode. It is characterized by being.

  In addition, the groove portion described in the preceding paragraph is a roller electrode for seam welding characterized in that an even number of grooves are formed opposite to each other with the rotation center axis of the roller electrode as the axis of symmetry.

  Further, the groove portion described above is filled or inserted with a heat-resistant insulating material, and the curvature of the surface of the heat-resistant insulating material exposed on the contact energizing surface side of this roller electrode is the contact between both sides of the heat-resistant insulating material. It is also a seam welding roller electrode characterized by having the same curvature as that of the current-carrying surface.

  According to the roller electrode for seam welding of the present invention described above, the groove is formed on the contact energization surface of the roller electrode, so that the contact energization surface of the roller electrode and the lid body are in contact and energized during seam welding. In the roller electrode, the part and the part where the lid does not contact the roller electrode and is not energized can be formed in the roller electrode. Therefore, since the heat generated in the energized welding portion can be sufficiently cooled while the non-energized portion (groove portion) of the roller electrode passes, problems such as cracks generated in the container due to heat can be suppressed to a minimum.

  Further, in the case of hermetically sealing a variety of electronic component packages, it is necessary to derive and weld the optimum seam welding conditions according to the package size for each package form. Therefore, since the welding mode is also controlled in the roller electrode, it is not necessary to derive the welding condition for each size of the package, and it is possible to deal with several types of packages under a single welding condition.

  Therefore, by using the roller electrode for seam welding according to the present invention, it is possible to provide an electronic component that has a good yield and low manufacturing cost.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol in each figure shall show the same object. FIG. 1 is a perspective view showing an embodiment of a roller electrode for seam welding according to the present invention. FIG. 2 is a plan view showing the form of seam welding using the seam welding roller electrode shown in FIG. 1 from above. FIG. 3 is a perspective view showing another embodiment of the roller electrode for seam welding in the present invention. In each drawing, parts or structures that are not necessarily required for this description are not shown. Moreover, in order to clarify each figure, some components or structures are exaggerated.

  The roller electrode 10 for seam welding shown in FIGS. 1 and 2 is made of a conductive metal in a lump, and its shape is generally cylindrical, and a rotating shaft 11 is attached to the center of the cylinder. The roller electrode 10 rotates. Although the shape is substantially cylindrical, the contact energizing surface 12 corresponding to the side surface of the cylinder has a constant taper angle as the diameter of the cylinder gradually decreases from the inner side surface 13 to the outer side surface 14 of the roller electrode 10. Is formed.

  The contact energizing surface 12 of the roller electrode 10 is formed with a groove 15 having a linear shape extending from the inner side surface 13 to the outer side surface 14 and having a rectangular cross section. In the present embodiment, the roller electrode 10 in which the six groove portions 15 are formed at equal intervals with the rotation axis of the roller electrode 10 as the axis of symmetry has been disclosed.

  A seam welding mode using such a roller electrode 10 will be described. A concave internal space is formed in the container 21 constituting the electronic component, and the opening of the container internal space is formed on the metal layer formed on the top of the container side wall around the opening of the internal space of the container 21. A lid 22 having a size covering all of the above is disposed, the lid 22 is fixed to the metal layer 19 by seam welding, and an electronic element mounted in the space inside the container is hermetically sealed to constitute an electronic component. As the metal layer, for example, a metal layer having a three-layer structure in which a metallized layer made of tungsten, molybdenum, or the like, a Ni layer, and an Au layer are sequentially laminated is used.

  The main structure of the lid 22 is made of a metal such as 42 alloy, Kovar, or phosphor bronze, for example, and the rough shape of the outer shape is a rectangular flat plate shape that matches the opening shape of the container 21. A metal brazing material is clad and formed on the main surface of the metal plate, which is the main structure of the lid 22, on the container joint side. This metal brazing material is formed by sequentially laminating a Ni layer and an Au—Sn layer from the metal plate surface side, and the thickness is 2 μm to 8 μm for the Ni layer and 10 μm to 30 μm for the Au—Sn layer. . Another material used as a metal brazing material is silver brazing.

  By forming the groove portion 15 in the contact energization surface 12 of the roller electrode 10 used for seam welding of the container 21 and the lid body 22, the roller electrode 10 is joined when the lid body 22 and the container 21 are joined by seam welding. However, in the region where the edge of the lid 22 and the metal layer are in contact with each other, the contact energizing surface 12 of the roller electrode 10 and the edge of the lid 22 are energized to generate heat. The heat welding location and the cooling location where the roller electrode 10 and the lid 22 are not in contact with each other by the groove portion 15 of the roller electrode 10 and heat is not generated due to the non-energization are alternately generated. By adopting such a configuration, it is possible to suppress the heat rise of the welded portion, and it is possible to suppress problems such as cracks that occur near the top of the container side wall of the container 21 to a minimum.

  In addition, in order to hermetically seal the container 21 and the lid body 22, it must be welded even at a location (cooling location) where no power is supplied by the groove portion 15 of the roller electrode 10 in the edge portion of the lid body 22. However, since the contact energization surface 12 of the roller electrode 10 is welded by conduction heat from the portion where contact energization with the lid body 13 is performed, welding in the entire edge portion of the lid body 22 becomes possible. Thus, the internal space of the container 21 can be reliably hermetically sealed.

  Even when the size of the package changes, the cooling capacity during seam welding is maintained by adjusting the size of the roller electrode 10 and the size and number of grooves 15 formed respectively. In extreme cases, it is possible to seam weld packages of different sizes with the same roller electrode.

  Furthermore, in the present embodiment, the groove portion having a rectangular cross-sectional shape is formed, but a groove portion having another cross-sectional shape such as a V shape or a U shape may be used as long as the effects of the present invention can be obtained. Furthermore, by increasing the width of the groove to enhance the cooling function, the contact energization surface portion of the roller electrode may appear to be convex in appearance.

  In addition, a constant pressurization may be required during seam welding. As the roller electrode used in such a case, as shown in FIG. 3, a heat-resistant insulating material 36 is filled or inserted in the groove 35 and exposed to the contact energizing surface 32 side of the roller electrode 31. By using the roller electrode 31 having the same curvature as that of the contact energizing surfaces 32 on both sides of the heat-resistant insulating material 36, a constant pressure can be applied during seam welding. An example of forming a heat-resistant insulating material in the groove part is a form formed by filling and solidifying a high heat-resistant glass material in the groove part, or processing the heat-resistant ceramic material into a groove part shape, There is a form that is inserted into the groove.

FIG. 1 is a perspective view showing an embodiment of a roller electrode for seam welding according to the present invention. FIG. 2 is a plan view showing a form of seam welding using a roller electrode for seam welding from above. FIG. 3 is a perspective view showing another embodiment of the roller electrode for seam welding in the present invention. FIG. 4 is a plan view showing a form of seam welding using a conventional roller electrode for seam welding from above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Roller electrode for seam welding 12 ... Contact energization surface 13 ... Inner side surface 14 ... Outer side surface 15 ... Groove part 36 ... Insulating substance

Claims (3)

  A roller electrode for seam welding, wherein at least one groove portion from the outer side surface to the inner side surface of the roller electrode is formed on a contact energization surface of the roller electrode.   2. The roller electrode for seam welding according to claim 1, wherein an even number of the groove portions are formed with the rotation center axis of the roller electrode as an axis of symmetry.   The groove portion is filled or inserted with a heat-resistant insulating material, and the curvature of the surface of the heat-resistant insulating material exposed on the contact-conductive surface side of the roller electrode is the contact-conductive surface on both sides of the heat-resistant insulating material. The roller electrode for seam welding according to claim 1 or 2, wherein the curvature is the same as the curvature of.

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