JP6099125B2 - Metal bonding equipment - Google Patents

Description

  The present invention relates to a metal used when a bar-shaped metal arranged in a vertical state and another metal such as a plate-like metal arranged in a horizontal state are joined with a joining material such as solder by using induction heating. The present invention relates to a joining apparatus.

  Conventionally, when an arm (plate metal) or the like arranged in a horizontal state is joined to an upper end portion of a rotating shaft (bar metal) arranged in a vertical state by soldering, it is performed as shown in FIG. . That is, a hole 3 b provided in the end 3 a of the plate-like metal 3 is fitted into a predetermined position of the upper end 2 a of the rod-like metal 2, and the plate-like metal 3 is joined at the joint 5 between the plate-like metal 3 and the rod-like metal 2. A ring-shaped solder 18 is placed on the upper surface 3 c, and a heating coil (not shown) is placed above the joint 5. Then, the transistor inverter connected to the heating coil is operated to supply a high-frequency current to the heating coil, and an eddy current is induced in the joining portion 5 to perform induction heating, and the solder 18 is melted to be joined. . In addition, this kind of metal joining apparatus (joining method) is disclosed by patent document 1, for example.

JP-A-7-308775

  However, in such a metal bonding apparatus, a ring-shaped solder 18 is placed on the upper surface 3c of the plate-like metal 3 of the bonding portion 5, and the bonding portion 5 is simply heated by induction heating with a heating coil. Since the rod-shaped metal 2 and the plate-shaped metal 3 are joined by melting the metal 18, when the solder 18 placed on the upper surface 3 c of the plate-shaped metal 3 is melted as shown in FIG. The molten solder 18 hangs down from a slight gap due to its own gravity or capillary action due to the gap between the hole 3b of the rod-like metal 2 and the plate-like metal 3, surface tension or overheating of the joint 5, etc. It tends to adhere irregularly to the outer peripheral surface of the rod-shaped metal 2 on the lower surface side of the metal 3, and it is difficult to obtain a highly accurate joining state, for example, there is a possibility of adversely affecting the rotating operation of the rod-shaped metal 2.

  The present invention has been made in view of such circumstances. The purpose of the present invention is to suppress the downward droop of the bonding material when bonding another metal to the vertical bar-shaped metal with a bonding material. Another object of the present invention is to provide a metal bonding apparatus that suppresses adhesion to the outer peripheral surface of the other metal lower surface and easily obtains a highly accurate bonding state.

In order to achieve this object, the invention according to claim 1 of the present invention supports a bar-shaped metal arranged in a vertical state and another metal in which a hole is fitted and arranged at a predetermined position of the bar-shaped metal. A coil unit disposed on the upper surface side of the other metal at a joint between the bar metal supported by the support unit and the other metal and disposed around the bar metal on the joint; and the coil unit comprising a heating coil having a tubular member made of a magnetic body arranged in a vertical state between the inner and the outer peripheral surface of the rod-shaped metal, a transistor inverter for supplying a high-frequency current to the heating coil, the said cylinder The shaped member has a lower end positioned above the lower end of the coil portion by a predetermined dimension, has a predetermined length, the upper end extends to the upper side of the rod-shaped metal, and cooling water circulates on the outer peripheral surface thereof. The supplied cooling pipe is fixed And said that you are.

Further, in the invention described in claim 2, the cylindrical member is connected and fixed to the vertical square pipe of the holder portion, to which both ends of the coil portion are connected at the lower end via an insulating connecting block. It is characterized by.

According to invention of Claim 1 or 2 of this invention, it arrange | positions between the coil part arrange | positioned around the rod-shaped metal on a junction part, and the inner side of this coil part, and the outer peripheral surface of a rod-shaped metal. Since the heating coil having a cylindrical member made of a magnetic material is disposed on the upper surface side of the other metal at the joint between the rod-shaped metal supported by the supporting means and the other metal, the cylindrical member causes the upper surface of the other metal of the rod-shaped member to be The side is shielded to prevent overheating, and by the rise in the tubular member of the atmosphere when the joint is heated, it is possible to suppress the downward dripping of the molten joining material, Adhesion to the outer peripheral surface of the other metal lower surface can be suppressed, and a highly accurate joining state can be easily obtained at the joining portion.

In addition, since the lower end of the cylindrical member is located above the lower end of the coil portion by a predetermined dimension, and has a predetermined length, the upper end thereof extends to the upper side of the rod-shaped metal, so that the shielding effect by the cylindrical member is obtained. It is possible to further suppress dripping of the joining member, for example, by reliably preventing overheating of the upper surface side of the joint part of the rod-shaped metal.

In addition, since the cooling pipe through which the cooling water is circulated and supplied is fixed to the outer peripheral surface of the cylindrical member, it is possible to suppress the heat generation of the cylindrical member during induction heating, thereby further reliably overheating the rod-shaped member. Can be prevented.

The schematic block diagram which shows one Embodiment of the metal joining apparatus concerning this invention The enlarged sectional view of the principal part Side view of the heating coil The plan view Process diagram showing an example of joining method using the same device Sectional drawing which shows the joining state of the junction part Sectional view similar to FIG. 6 showing the joining state of the conventional joint

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 6 show an embodiment of a metal bonding apparatus according to the present invention. In addition, the same code | symbol is attached | subjected and demonstrated to the same site | part as FIG. As shown in FIG. 1, a metal joining apparatus 1 supports a rod-like metal 2 such as a rotating shaft to be joined in a vertical state, and a plate-like metal as an other metal such as an arm on an upper end portion 2a of the rod-like metal 2. 3 is provided with a support base 4 having a set recess 4a or the like as support means for supporting 3 in a horizontal state, and a heating coil 6 disposed above the joint 5 of the rod-like metal 2 and plate-like metal 3.

The metal bonding apparatus 1 includes a transistor inverter 7 and a cooling water supply unit 8 connected to the heating coil 6, a coil moving unit 9 that moves the heating coil 6 up and down, the transistor inverter 7, and the cooling water supply unit 8. The control unit 10 for controlling the coil moving unit 9 and the like is provided. The control unit 10 is used for setting a joining process and conditions (heating conditions, etc.) described later, and for starting and ending work. An operation unit 11 having various operation buttons and keys is connected.

  As shown in FIGS. 3 and 4, the heating coil 6 includes a coil portion 13, a cylindrical member 14, and a holder portion 15. The coil portion 13 is formed, for example, by winding a copper pipe with an insulated outer periphery twice to form a substantially circular shape in plan view, and the opening at both ends is in electrical communication with the vertical square pipe 15a of the holder portion 15 and the internal hole. Connected with.

  The cylindrical member 14 is formed of a copper round pipe having a predetermined diameter and a predetermined length L (see FIG. 2), and is connected and fixed to the vertical square pipe 15a of the holder portion 15 via an insulating connection block 16. ing. Further, a U-shaped cooling pipe 14a made of a copper round pipe is brazed and fixed to the outer peripheral surface of the cylindrical member 14 on the side opposite to the connection block 16 and is attached to both ends of the cooling pipe 14a. The hose connector 14b is fixed by brazing. The hose connector 14b and the cooling water supply unit 8 are connected by a cooling hose so that cooling water is circulated and supplied into the cooling pipe 14a.

  The holder portion 15 is fixed to a pair of the vertical angle pipes 15a having both ends of the heating coil 6 connected to the lower ends thereof, and to the upper end portions of the respective vertical angle pipes 15a, and is press-fixed and fixed via an insulating plate 15c. A pair of holder plates 15b. The holder plate 15b is connected to the coil moving portion 9 and is moved up and down as indicated by an arrow A in FIG. The holder plate 15b is electrically connected to the output terminal of the transistor inverter 7 with a cable, so that the coil portion 13 is electrically connected to the transistor inverter 7 through the cable and the vertical square pipe 15a. It is like that.

  A cooling pipe 15d having a lower end communicating with the vertical square pipe 15a is connected and fixed to the outer surface of each holder plate 15b, and a hose connector 15e is brazed and fixed to the other end of each cooling pipe 15d. Yes. The hose connector 15e and the cooling water supply unit 8 are connected by a cooling hose so that the cooling water is circulated and supplied into the copper pipe of the coil unit 13 through the cooling hose, the cooling pipe 15e, and the vertical rectangular pipe 15a. It has become.

  The positional relationship between the coil portion 13 and the cylindrical member 14 of the heating coil 6 and the rod-shaped metal 2 is set as follows. That is, as shown in FIG. 2, the cylindrical member 14 arranged in a vertical state inside the coil portion 13 has an outer diameter set smaller than the inner diameter of the coil portion 13 by a predetermined dimension d1, and the inner diameter is a rod shape. The predetermined dimension d2 is set larger than the outer diameter of the metal 2. Further, the lower surface (lower end) of the heating coil 6 is positioned below the lower surface (lower end) of the cylindrical member 14 by a predetermined dimension d3 (for example, about 1 mm), that is, the heating coil 6 projects downward from the cylindrical member 14. It is supposed to be located. Thereby, in a state where the heating coil 6 is lowered (heated state), the cylindrical member 14 covers the outer peripheral surface of the upper end portion 2a of the rod-shaped metal 2, and the lower end of the heating coil 6 and the upper surface 3c of the plate-shaped metal 3 are predetermined. It is arranged with a gap d4.

  The transistor inverter 7 includes, for example, an inverter circuit using semiconductor switching elements such as transistors, IGBTs, thyristors, and an output transformer (current transformer) connected to an output terminal of the inverter circuit. And it is comprised so that the high frequency current of a predetermined frequency may be supplied to the coil part 13 of the heating coil 6 connected to the secondary side of the output transformer via the cable. The cooling water supply unit 8 includes a cooling tank, a circulation pump, and the like, and as described above, the coil part 13 of the heating coil 6, the cooling pipe 14a of the cylindrical member 14, the cooling pipe 15d of the holder part 15, and the vertical The cooling water is circulated and supplied into the square pipe 15a.

  By the way, in the above description, as shown by the solid line in FIG. 1, the heating coil 6 can be moved up and down by the coil moving unit 9, and the rod-shaped metal 2 and the plate-shaped metal 3 fixedly set on the support base 4. The heating coil 6 is moved up and down with respect to the joint 5 to set the heating coil 6 and the joint 5 in a predetermined positional relationship, but the support 4 is moved up and down without moving the heating coil 6. You may do it. In this case, as shown by a two-dot chain line in FIG. 1, the support base moving unit 17 is connected to the support base 4, and the support base 4 is fixedly arranged by operating the support base moving unit 17 by the control unit 10. The positional relationship between the joint 5 and the heating coil 6 may be set to a predetermined value by moving the heating coil 6 up and down as indicated by an arrow B.

  Next, an example of a soldering method of the bar-shaped metal 2 and the plate-shaped metal 3 (these are called workpieces) using the metal bonding apparatus 1 configured as described above will be described based on the process diagram of FIG. First, the lower end of the bar-shaped metal 2 in which the hole 3b of the end 3a of the plate-like metal 3 is fitted to the upper end 2a is fitted into the set recess 4a provided in the support base 4 so that the bar-shaped metal 2 is vertically aligned. As shown in FIG. 2, the plate-shaped metal 3 is supported on the support base 4 in the horizontal state and the workpiece is set while the ring-shaped solder 18 is inserted from the upper end 2a of the rod-shaped metal 2. The solder 18 is set (K01) on the workpiece joint 5 (on the upper surface 3c of the plate-like metal 3).

  In this state, according to the control signal of the control unit 10, the coil moving unit 9 is operated to lower the heating coil 6, or the support table moving unit 17 is operated to raise the support table 4 (K02). When the positional relationship between the heating coil 6 and the workpiece joining portion 5 is set to a predetermined value in this step K02, the transistor inverter 7 is actuated by the control signal of the control unit 10 to cause the heating coil 6 to generate a high frequency with a predetermined output at a predetermined frequency. The current is supplied for a predetermined time to inductively heat the joint portion 5 and the cooling water supply portion 8 is operated to circulate and supply the cooling water to the coil portion 13 and the cooling pipes 14a and 15d (K03).

  At the time of induction heating by the heating coil 6 in this step K03, the magnetic flux generated from the coil portion 13 is absorbed by the cylindrical member 14 made of a copper pipe, and the action on the upper end portion 2a of the rod-shaped metal 2 is reduced, that is, the cylindrical member. 14, the magnetic flux is shielded (blocked / shielded), the overheating of the upper end 2 a of the rod-shaped metal 2 is suppressed, and the output of the transistor inverter 7 is set in advance, so that the solder of the joint 5 Only the portion where 18 is present can be heated to the optimum temperature for soldering.

  Further, the atmosphere around the joint 5 which has become high due to the temperature rise of the joint 5 heated by induction heating or the temperature due to melting of the solder 18 rises in the cylindrical member 14 as shown by the arrow C in FIG. An updraft is generated in the cylindrical member 14. The effective heating of only the solder 18 portion and the rising airflow of the atmosphere can suppress the downward dripping of the molten solder 18. As shown in FIG. Even if it stops in the hole 3b and is prevented from adhering to the outer peripheral surface of the bar-shaped metal 2 on the lower surface side of the plate-shaped metal 3, or even if it hangs down, It is in a state where it hangs substantially uniformly on the entire outer periphery. This has been confirmed by experiments, and a highly accurate workpiece is obtained with respect to the conventional soldering quality.

  Then, induction heating and circulating supply of cooling water are performed for a predetermined time in step K03, and when the workpiece soldering is completed, the heating coil 6 is raised or the support 4 is lowered (K04) by the control signal of the control unit 10. Thereafter, the work is taken out from the set recess 4a of the support base 4 and unset (K05), thereby completing a series of work soldering operations. Note that all of the steps K01 to K05 may be automated, or a part thereof may be automated (partially manual).

  Thus, in the metal joining apparatus 1 of the said embodiment, the heating coil 6 has the coil part 13 and the cylindrical member 14, and the joining of the rod-shaped metal 2 supported by the support stand 4 and the plate-shaped metal 3 is carried out. Since the portion 5 is arranged on the upper surface 3c side of the plate-like metal 3, the cylindrical member 14 made of a magnetic material shields the upper end portion 2a of the rod-like metal 2 so that the temperature of the joint portion 5 can be adjusted, and the overheating is prevented. It is possible to prevent the molten solder 18 from drooping downward due to the rise of the atmosphere in the joint portion 5 in the cylindrical member 14 and the like. As a result, adhesion of the melted solder 18 to the outer peripheral surface of the lower surface side of the plate-like metal 3 of the rod-like metal 2 can be suppressed, and a highly accurate joined state can be easily obtained at the joint portion 5. The rotation operation can be performed with high accuracy.

  Moreover, since the lower end of the cylindrical member 14 is positioned above the lower end of the heating coil 6 by a predetermined dimension d3 and has a predetermined length L, the upper end thereof extends to the upper side of the rod-shaped metal 2, so that the cylindrical shape It is possible to further suppress the dripping of the melted solder 18, for example, by further enhancing the shielding effect of the upper portion of the joint portion 5 of the rod-shaped metal 2 by the member 14 and reliably preventing overheating of the upper surface side of the joint portion 5 of the rod-shaped metal 2. it can. Further, since the cooling pipe 14a to which cooling water is circulated and supplied is fixed to the outer peripheral surface of the cylindrical member 14, heat generation of the cylindrical member 14 during induction heating can be suppressed, and the rod-shaped metal 2 is overheated. Can be more reliably prevented.

  In addition, in the said embodiment, although applied to the joining apparatus which uses the solder 18 as a joining material, it cannot be overemphasized that it can apply also to the joining apparatus which uses silver brazing. Moreover, the number of turns of the coil portion 13 of the heating coil 6, the length L of the cylindrical member 14, the overall shape of the heating coil 6, and the like in the embodiment are only examples, and for example, the coil portion 13 is wound once or three times. The present invention can be appropriately changed without departing from the gist of each invention related to the present invention, such as a plurality of windings as described above.

  The present invention is not limited to joining a bar-like metal arranged in a vertical state and a plate-like metal as another metal arranged in a horizontal state, but joins a bar-like metal in a vertical state to other metals in various states and shapes. Applicable to all metal joining devices.

  DESCRIPTION OF SYMBOLS 1 ... Metal joining apparatus, 2 ... Bar-shaped metal, 2a ... Upper end part, 3 ... Plate-shaped metal (other metal), 3a ... End part, 3b ... Hole, 3c ... -Upper surface, 4 ... support base (support means), 5 ... junction, 6 ... heating coil, 7 ... transistor inverter, 8 ... cooling water supply unit, 9 ... coil movement , 10 ... control part, 13 ... coil part, 14 ... cylindrical member, 14a ... cooling pipe, 15 ... holder part, 17 ... support base moving part, 18 ... ·solder.

Claims (2)

Support means for supporting a rod-like metal arranged in a vertical state and another metal having a hole fitted and disposed at a predetermined position of the rod-like metal, and a joint between the rod-like metal and the other metal supported by the support means The coil portion disposed on the upper surface side of the other metal and disposed around the rod-shaped metal on the joint, and the magnet disposed in a vertical state between the inside of the coil portion and the outer peripheral surface of the rod-shaped metal. A heating coil having a cylindrical member made of a body, and a transistor inverter that supplies a high-frequency current to the heating coil,
The cylindrical member has a lower end positioned above the lower end of the coil portion by a predetermined dimension, has a predetermined length, and has an upper end extending to the upper side of the rod-shaped metal, and has cooling water on its outer peripheral surface. A metal joining apparatus characterized in that a cooling pipe to which a circulatory supply is circulated is fixed . 2. The metal according to claim 1, wherein the cylindrical member is connected and fixed to a vertical square pipe of a holder portion to which both ends of the coil portion are connected to a lower end via an insulating connecting block. Joining device.

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