JP2007283326A - Brazing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brazing method that prevents a weld zone from lacking in filler metal. <P>SOLUTION: A rotary shaft 148 rotates in the direction of the arrow B by the rotation of a driving belt 156, which makes a tool 120 and a turbine runner 70 turn in the direction of the arrow B together with a turntable 142. By a centrifugal force produced by this rotation, a filler metal 100 (filler metal 100 shown by a dotted line in Fig. 2) deviated from a prescribed position (a position in contact with the inner circumferential face of a shell 72 and the position of the filler metal 100 shown by a solid line in Fig. 2) moves to the prescribed position. Accordingly, even if the position of the filler metal 100 is deviated during the transit, the turbine runner 70 is rotated before the heating in a heating chamber 40 and is further kept rotated during the heating, which makes the filler metal 100 continuously stay in the prescribed position, thus, the weld zone is prevented from lacking in the filler metal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brazing method used, for example, in assembling a turbine runner.

  A torque converter is known as a component that constitutes an automatic transmission mounted on a passenger car. This torque converter is composed of a turbine runner and the like, and the turbine runner is manufactured by brazing a large number of plate-like blades to a bowl-shaped shell and a ring-shaped inner core. A large number of slits (elongated holes) are formed in the shell and the inner core, and protrusions inserted into the large number of slits are formed on the blade.

When brazing, a blade projection is inserted into the slits of the shell and inner core and bent, and a brazing material is placed near the bent projection and heated. By this heating, the brazing material is melted and the projections are joined to the shell and the inner core, so that the blade is joined to the shell and the inner core. As a technique for heating the turbine runner during brazing, a technique using a non-oxidizing atmosphere heating furnace, a halogen lamp or an induction heating coil is known (for example, see Patent Document 1).
JP 2004-176166 A

  However, at the time of brazing as described above, the brazing material may be displaced from a predetermined position (displacement occurs) due to vibration, impact, or the like during transfer of the workpiece to the brazing device. When the brazing material is displaced from the predetermined position as described above, a phenomenon (brazing) that the brazing material flows to an unnecessary portion and no brazing material is present in a part of the portion to be joined occurs.

  In view of the above circumstances, an object of the present invention is to provide a brazing method that prevents the above-described brazing.

In order to achieve the above object, a first brazing method of the present invention includes an annular side wall, and a plate-like member disposed inside the side wall and having one end in contact with the inner peripheral surface of the side wall. In the brazing method for brazing the plate-like member of the workpiece to the side wall,
(1) A brazing material is hung on a portion of the plate-like member close to the inner peripheral surface,
(2) The brazing material is brought into contact with the inner peripheral surface by a centrifugal force generated by rotating the workpiece,
(3) The brazing material is brazed to the side wall by heating and melting the brazing material while keeping the brazing material in contact with the inner peripheral surface.

The second brazing method of the present invention for achieving the above object comprises: an annular side wall; and a plate-like member disposed on the inner side of the side wall and having one end contacting the inner peripheral surface of the side wall. In the brazing method for brazing the plate-like member of the workpiece provided to the side wall,
(4) A brazing material is hung on a portion of the plate-like member close to the inner peripheral surface,
(5) While maintaining the state in which the brazing material is brought into contact with the inner peripheral surface by centrifugal force generated by rotating the workpiece, the brazing material is heated and melted so that the plate-like member is placed on the side wall. It is characterized by brazing.

To achieve the above object, the third brazing method of the present invention is a bowl shape with an opening formed at the center, and a plurality of slits are formed at predetermined intervals on the outer peripheral edge and the inner peripheral edge. And a slit that is disposed between the outer peripheral edge and the inner peripheral edge of the shell and that is opposed to the slit of the outer peripheral edge of the shell. And an inner core in which a slit facing the inner peripheral edge of the shell is formed on the inner peripheral edge, and an inner peripheral edge of both the shell and the inner core from between the outer peripheral edge portions of both the shell and the inner core. A blade of a turbine runner provided with a protrusion formed by being inserted into each slit and bent, which is spread in a space between the parts, and the shell and the inner In brazing method for brazing to a core,
(6) A brazing material is hung on a portion of the blade close to the inner peripheral surface of the shell,
(7) The brazing material is brought into contact with the inner peripheral surface by a centrifugal force generated by rotating the turbine runner,
(8) The brazing material is brazed to the shell by heating and melting the brazing material while keeping the brazing material in contact with the inner peripheral surface.

The fourth brazing method of the present invention for achieving the above object is a bowl shape having an opening formed in the central portion, and a plurality of slits are formed at predetermined intervals on the outer peripheral edge portion and the inner peripheral edge portion. And a slit that is disposed between the outer peripheral edge and the inner peripheral edge of the shell and that is opposed to the slit of the outer peripheral edge of the shell. And an inner core in which a slit facing the inner peripheral edge of the shell is formed on the inner peripheral edge, and an inner peripheral edge of both the shell and the inner core from between the outer peripheral edge portions of both the shell and the inner core. A blade of a turbine runner provided with a protrusion formed by being inserted into each slit and bent, which is spread in a space between the parts, and the shell and the inner In brazing method for brazing to a core,
(9) A brazing material is hung on a portion of the blade close to the inner peripheral surface of the shell,
(10) The brazing material is heated and melted while the brazing material is kept in contact with the inner peripheral surface by centrifugal force generated by rotating the turbine runner, so that the blade is brazed into the shell. It is characterized by attaching.

  According to the brazing method of the present invention, the brazing material is heated and melted while keeping the brazing material in contact with the inner peripheral surface of the side wall by the centrifugal force generated by rotating the workpiece. It is melted without leaving the inner peripheral surface of the side wall. As a result, brazing without brazing can be realized.

  The present invention has been realized in brazing when producing a turbine runner.

  With reference to FIG. 1, the brazing apparatus used for the brazing method of the present invention will be described.

  FIG. 1 is a plan view showing a schematic configuration of a brazing apparatus used in the brazing method of the present invention.

  The brazing device 10 includes a conveyance roller conveyor 20 that conveys a turbine runner 70 (an example of a workpiece according to the present invention) placed on a jig (carrier) 120 (see FIG. 2) in the direction of arrow A, An inlet side preliminary chamber 30 in an oxidizing atmosphere (non-oxidizing atmosphere), a heating chamber (brazing chamber) 40 for melting and brazing the brazing material by heating the turbine runner 70 to a predetermined temperature for brazing, and brazing A cooling chamber 50 for cooling the attached turbine runner 70 and a non-oxidizing atmosphere outlet side preliminary chamber 60 are provided. The turbine runner 70 is transported while being placed on the jig 120 (see FIG. 2) until it is placed on the transport roller conveyor 20 and discharged from the cooling chamber 50.

  The plurality of turbine runners 70 placed on the conveying roller conveyor 20 are pushed together with the jig 120 by the pusher 22 and conveyed on the conveying roller conveyor 20 in the direction of arrow A, and the jigs 120 are moved one by one by the pushers 24 and 26. By pushing, the shutter 32-1 is accommodated in the entrance side preliminary chamber 30. The inlet side preliminary chamber 30 is replaced with a non-oxidizing atmosphere each time the turbine runner is accommodated. Further, it is separated from the heating chamber 40 by a shutter 32-2. The jig 120 pushed by the pusher 34 is transferred from the inlet side preliminary chamber 30 to the heating chamber 40 together with the turbine runner 70. The turbine runner 70 conveyed to the heating chamber 40 is heated to a temperature required for brazing by a heater (not shown). The heating chamber 40 is maintained in a non-oxidizing atmosphere such as a nitrogen atmosphere. The turbine runner 70 is uniformly heated and the brazing materials 100 and 110 (see FIG. 4 and the like) are completely melted to perform brazing. Is done.

  The brazed turbine runner 70 is pushed by the pusher 42 together with the jig 120, passes through the opened shutter 32-3, and is conveyed to the cooling chamber 50. In the cooling chamber 50, the turbine runner 70 is cooled to a predetermined temperature of 200 ° C. or lower. After this cooling, the turbine runner 70 is discharged by the pusher 52 through the opened shutter 32-4 into the outlet side preliminary chamber 60. The turbine runner 70 placed on the jig 120 is discharged from the outlet side preliminary chamber 60 with a pusher or the like (not shown) to complete the brazing operation. The brazed turbine runner 70 is removed by a conveying device (not shown), the turbine runner 70 on which a new brazing material is set is placed on the jig 120, and brazing is repeated.

  In the heating chamber 40 described above, the turbine runner 70 is heated while rotating. A mechanism for rotating the turbine runner 70 will be described with reference to FIG.

  FIG. 2 is a front view showing a schematic configuration of a rotation mechanism for rotating the turbine runner 70 fixed to the jig to bring the brazing material into contact with (in contact with) the inner peripheral surface of the shell. Shown cut.

  The jig 120 includes a disk-shaped base 122, a shaft portion 124 that extends right above the center of the base 122, and a work fixing portion 126 that is attached to the top of the shaft portion 124. The work fixing part 126 includes a disk-like upper fixing part 126a and a lower fixing part 126b having substantially the same size as the upper fixing part 126a. When the turbine runner 70 is fixed to the jig 120, a circular flat portion that is lowered by one step inside the inner peripheral edge 72c of the shell 72 of the turbine runner 70 is sandwiched between the upper fixing portion 126a and the lower fixing portion 126b, and the screw 128 is inserted. Tighten and fix.

  A rotation mechanism 140 that rotates the jig 120 is disposed in the heating chamber 40 (see FIG. 1). The rotating mechanism 140 is provided with a disk-shaped turntable 142 having substantially the same diameter as the base 122 of the jig 120. A rod-like fixing member 144 for fixing the jig 120 to the turntable 142 is disposed at the center of the turntable 142. The fixing member 144 is biased upward by a coil spring 146, and its upper end portion 144 a protrudes from the turntable 142. When the base 122 of the jig 120 is placed on the turntable 142, the jig 120 positioned in the inlet side reserve chamber 30 (see FIG. 1) is pushed by the pusher 34 (see FIG. 1), and the jig 120 is pushed. The base 122 is placed on the turntable 142. In this case, while the base 122 is sliding on the turntable 142, the upper end 144a of the fixing member 144 is pushed down by the base 122. When the base 122 is completely placed on the turntable 142 (the concave portion 122a of the base 122 is positioned right above the fixing member 144), the upper end 144a of the fixing member 144 is the base as shown in FIG. The jig 120 fits into the conical recess 122a of the table 122, and is fixed to the rotating mechanism 140 by its own weight and friction, and is rotated with the rotation of the turntable 142.

  The fixing member 144 and the coil spring 146 are disposed in a recess formed in the upper end portion of the rotating shaft 148 fixed to the lower surface of the turntable 142. The rotating shaft 148 is rotatably attached to a bearing 152 fixed to the bearing box 150. A pulley 154 is fixed to the lower end portion of the rotating shaft 148, and a drive belt 156 is stretched around the pulley 154. The drive belt 156 is configured to rotate by a motor (not shown). As the drive belt 156 rotates, the rotation shaft 148 rotates around the rotation center C in the direction of the arrow B (or the direction opposite to the direction of the arrow B), whereby the jig 120 and the turbine runner together with the turntable 142 are rotated. 70 also rotates in the direction of arrow B.

  Due to the centrifugal force generated by this rotation, the brazing material 100 will deviate from the specified position (the position at which the brazing material 100 contacts the inner peripheral surface 72f of the shell 72 and the position of the brazing material 100 shown by the solid line in FIG. 2). The material 100 (the brazing material 100 indicated by the dotted line in FIG. 2) moves to the specified position. Therefore, even if the position of the brazing filler metal 100 is shifted during conveyance, the brazing filler metal 100 is brought into the specified position by rotating the turbine runner 70 before heating in the heating chamber 40 and continuing to rotate during heating. Since it will continue to be located, brazing can be prevented.

  The turbine runner 70 manufactured by the brazing described above and the brazing material 100 to be used will be described with reference to FIGS. 3, 4, and 5.

  FIG. 3 is a perspective view showing the position of the brazing material when brazing the turbine runner. 4A is a plan view showing a brazing material 100 used in the present invention, and FIG. 4B is a plan view showing a conventional brazing material 110 that is used by being lightly inserted or sandwiched. (C) is a top view which shows the brazing material 102 of the other example of the brazing material used by this invention. FIG. 5 is a perspective view showing the turbine runner after the brazing material of FIG. 3 has melted.

  The turbine runner 70 includes a bowl-shaped shell 72 having an opening 72 a formed in the center, a ring-shaped inner core 74 disposed between the outer peripheral edge 72 b and the inner peripheral edge 72 c of the shell 72, and the shell 72. A plurality of blades 76 that extend in a space between the outer peripheral edge portion 72b of the inner core 74 and the inner peripheral edge portion 74c of the inner core 74 and the inner peripheral edge portion 74c of the inner core 74. It has. 3 and 5, the upper fixing portion 126a and the screw 128, which are a part of the jig 120 on which the turbine runner 70 is placed, are exposed from the opening 72a of the shell 72.

  A plurality of slits 72bs (not shown in the figure because only the blades 76 are inserted, but only the signs are shown) are formed at substantially equal intervals on the outer peripheral edge 72b of the shell 72, and a plurality of slits 72bs are also formed on the inner peripheral edge 72c. The slits 72cs (not shown in the figure because the blade 76 is inserted, but only the sign is shown) are formed at substantially equal intervals. In each figure, the projection 76a of the blade 76 is inserted into the slit 72bs of the shell 72 and bent, and the projection 76b of the blade 76 is inserted into the slit 72cs of the shell 72 and bent. The number of the plurality of slits 72bs is the same as the number (number of sheets) of the blades 76, and the number of the plurality of slits 72cs is also the same as the number (number of sheets) of the blades 76. The shell 72 is formed with a ring-shaped (annular) bottom portion 72d that is smoothly lowered from the outer peripheral edge portion 72b and lower than the outer peripheral edge portion 72b. A portion of the bottom portion 72d opposite to the outer peripheral edge portion 72b is higher than the lowest portion of the bottom portion 72d, and forms an inner peripheral edge portion 72c. A central circular portion of the flat portion that is one step down from the inner peripheral edge 72c is an opening 72a.

  A portion of the outer peripheral edge 74b of the inner core 74 facing the slits 72bs of the shell 72 is formed with slits 74bs (not shown in the figure because the blades 76 are inserted, but only the signs are shown). . Similarly, slits 74cs (not shown in the figure because the blades 76 are inserted, but only the signs are shown) are formed in the inner peripheral edge 74c of the inner core 74 facing the slits 72cs of the shell 72. Has been. In each figure, the projection 76c of the blade 76 is inserted into the slit 74bs of the inner core 74 and bent, and the projection 76d of the blade 76 is inserted into the slit 74cs of the inner core 74 and bent. The number of the plurality of slits 74bs is the same as the number (number of sheets) of the blades 76, and the number of the plurality of slits 74cs is also the same as the number (number of sheets) of the blades 76. The inner core 74 is located above the bottom 72 d of the shell 72 and is connected to the shell 72 via a blade 76. The inner core 74 is disposed at a position where it is placed on the blade 76. Further, the inner core 74 is disposed at a position slightly lower than the outer peripheral edge portion 72b of the shell 72 and slightly higher than the inner peripheral edge portion 72c.

  As described above, the blade 76 is formed with protrusions 76a, 76b, 76c, and 76d that are inserted into the slits 72bs, 72cs, 74bs, and 74cs and bent. The blade 76 rises from the outer peripheral edge portion 72b, the inner peripheral edge portion 72c, and the bottom portion 72d by inserting and bending the protrusions 76a, 76b, 76c, and 76d into the slits 72bs, 72cs, 74bs, and 74cs. In this state, they are arranged at equal intervals along the outer peripheral edge portion 72b of the shell 72 (along the inner peripheral circular portion 72c or the outer peripheral edge portion 74b and the inner peripheral edge portion 74c of the inner core 74). The blade 76 is present in a space that is sandwiched between the shell 72 and the inner core 74.

  Further, the protrusions 76e and 76f are formed between the protrusion 76a and the protrusion 76b of the blade 76, and the protrusions 76e and 76f are inserted into the slits 72gs and 72hs formed in the shell 72 and bent, so that The twisted shape of the blade 76 between the cores 74 is maintained. The protrusions 76a, 76e, 76f, and 76b inserted and bent into the slits 72bs, 72gs, 72hs, and 72cs of the shell 72 are brazed to the outer peripheral surface 72e of the shell 72 with the brazing material 100 shown in FIG. Is done. Further, the projections 76c and 76d inserted and bent into the slits 74bs and 74cs of the inner core 74 are brazed and joined to the inner peripheral surface (upper surface) 74d of the inner core 74 by the brazing material 110 shown in FIG. Is done. The brazing materials 100 and 110 are made of a pure copper (or copper alloy) wire (preform), and the brazing material 100 is U-shaped as shown in FIG. 110 is V-shaped as shown in FIG.

  When the brazing material is normally used in a V shape or a U shape in which the gap W (see FIG. 4A) is slightly smaller than the thickness of the brazed part, the part is lightly inserted into the brazed part. It is used so as not to move (or to come off). However, in the present invention, since the brazing material is moved to a specified position (brazing position) by centrifugal force, the U-shaped brazing material shown in FIG. 4A is used, and the gap W is larger than the thickness of the brazing component. Or a brazing filler metal 100 is produced that is slightly larger or slightly larger than the maximum thickness within the range of movement. The brazing material moves more easily as the frictional resistance of the part (part) where the brazing material and the brazing material of the brazed part are hooked is smaller. Therefore, the bending inner diameter R of the brazing filler metal 100 is equal to or larger than the inner diameter corresponding to the gap W in FIG. Such a shape has a smaller frictional resistance than the V-shape having a small bending inner diameter r in FIG. 4B, so that the number of rotations causing the centrifugal force can be reduced. Moreover, when this rotation speed is made the same, there is little variation in the distance traveled by the brazing material. The V-shaped brazing material whose bending inner diameter r is equal to or larger than the inner diameter R corresponding to the U-shaped gap W is not perpendicular to the surface on which the brazing material of the brazed part is hooked (there is a twist or the like). ) Is not appropriate because the tip Y of the leg on one side is separated from the brazed portion (boundary line). FIG. 4C shows a brazing material 102 having another shape. The shape of the brazing material 102 is such that the length X of the legs of the brazing material 100 shown in FIG. 4 (a) is unequal (one leg is shortened), depending on the flow of the brazing part. Use differently. The amount of brazing material used varies depending on the length of the brazed part (brazing length), so by changing the number of brazing materials, increasing or decreasing the length, and changing the wire diameter, Adjust usage.

  When brazing the shell 72, the inner core 74, and the blade 76, the turbine runner 70 is fixed to the jig 120, and the brazing material 100 is fixed to the inner peripheral surface of the shell 72 of the blade 76, as shown in FIG. Hang it on the part near. In this state, the jig 120 is transported to the heating chamber 40 by the transport roller conveyor 20. The brazing material 100 may deviate from the defined position described with reference to FIG. 2 due to the vibration during the conveyance. However, as described above, in the heating chamber 40, the jig 120 and the turbine runner 70 are rotated in the direction of the arrow B (see FIGS. 1 and 2) together with the turntable 142, and the centrifugal force generated by the rotation causes the rotation from the specified position. The shifted brazing material 100 moves to the specified position. The brazing material 100 starts to move from about 60 times / minute, which is a rotational speed close to a calculated value obtained from a well-known centrifugal force calculation formula and a friction coefficient (actually measured value). However, due to the variation in frictional resistance between the blade 76 and the brazing material 100, a rotational speed of 90 times / minute to 120 times / minute is required for all the brazing material 100 to move to the specified position.

  As described above, the turbine runner 70 is rotated before heating in the heating chamber 40 and is further rotated during heating. Therefore, even if the position of the brazing filler metal 100 is shifted during conveyance, the brazing filler metal 100 remains at the specified position. Will continue to be located. As a result, as shown in FIG. 5, the brazing material 100 can be melted uniformly (the melted brazing material is denoted by 101), thereby preventing brazing. Further, the brazing material 110 inserted and used melts uniformly without moving during conveyance and brazing, and the state of the melted brazing material 111 is shown in FIG.

  In the present embodiment, the brazing material 110 that is sandwiched and used is also used at the same time. Therefore, the optimum rotational speed is selected in consideration of the fact that the brazing material 110 does not come off due to the rotation of the turbine runner 70.

  In the example described above, the turbine runner 70 is rotated before heating in the heating chamber 40, and the brazing filler metal 100 is heated while rotating the turbine runner 70. 140 may be provided, and the brazing filler metal 100 may be moved to a specified position by rotating the turbine runner 70 in the inlet side preliminary chamber 30. In this case, the turbine runner 70 is conveyed to the heating chamber 40 so that the brazing material 100 does not move from the specified position.

  When the temperature of the brazing filler metals 100 and 110 reaches a temperature at which the brazing filler metals 100 and 110 begin to melt (in the case of pure copper brazing filler metal, the melting point is 1083 ° C.), the rotational speed of the turbine runner 70 is decreased (60 times / min or less). ), It is possible to prevent the melted brazing materials 101 and 111 from being scattered (spread) in a range where brazing is unnecessary. By controlling the rotation mechanism 140 by a control unit (not shown), the rotation speed of the turbine runner 70 in the heating chamber 40 is controlled.

Here, a specific example of the above-described brazing method will be described.
The dimensions of the work (turbine runner 70) were 280 mm in outer diameter, 30 mm in height, and 29 blades. The material of the brazing materials 100 and 110 was pure copper, and the weight of the brazing material 100 was 2 grams because the brazing distance was long, and the brazing material 110 was 1 gram. Moreover, in the heating chamber 40, it heated at the temperature within the range of 1130 degreeC-1150 degreeC. Furthermore, the number of rotations of the workpiece was 90 times / minute during heating and non-heating, and 30 times / minute immediately before brazing (the temperature at which the brazing material starts to melt). The direction of rotation may be forward or reverse (in the direction of arrow B or in the opposite direction). The atmosphere of the heating chamber 40 and the cooling chamber 50 was nitrogen gas, and the atmosphere of the cooling chamber 50 was (nitrogen + hydrogen (15%)) gas.

It is a top view which shows schematic structure of the brazing apparatus used for the brazing method of this invention. It is a front view which shows schematic structure of the rotation mechanism which rotates the turbine runner fixed to the jig | tool, and makes a brazing material contact the inner peripheral surface of a shell. It is a perspective view which shows the position of the brazing material at the time of brazing a turbine runner. (A) is a top view which shows the brazing material used by this invention, (b) is a top view which shows the conventional brazing material. (C) is a top view which shows the other example of the brazing material used by this invention. It is a perspective view which shows the turbine runner after the brazing material of FIG. 3 has melted.

Explanation of symbols

10 Brazing device 40 Heating chamber (brazing chamber)
70 Turbine runner 72 Shell 74 Inner core 76 Blades 100, 102, 110 Brazing material 120 Jig 140 Rotating mechanism

Claims (4)

In the brazing method for brazing the plate-like member of the workpiece comprising an annular side wall and a plate-like member disposed on the inner side of the side wall and having one end contacting the inner peripheral surface of the side wall,
A brazing material is hung on the portion of the plate-like member close to the inner peripheral surface,
Bringing the brazing material into contact with the inner peripheral surface by centrifugal force generated by rotating the workpiece;
A brazing method comprising brazing the plate member to the side wall by heating and melting the brazing material in a state where the brazing material is in contact with the inner peripheral surface. In the brazing method for brazing the plate-like member of the workpiece comprising an annular side wall and a plate-like member disposed on the inner side of the side wall and having one end contacting the inner peripheral surface of the side wall,
A brazing material is hung on the portion of the plate-like member close to the inner peripheral surface,
The plate member is brazed to the side wall by heating and melting the brazing material while keeping the brazing material in contact with the inner peripheral surface by centrifugal force generated by rotating the workpiece. A brazing method characterized by that. A bowl having an opening formed at the center, and a shell having a plurality of slits formed at a predetermined interval between the outer peripheral edge and the inner peripheral edge, and between the outer peripheral edge and the inner peripheral edge of the shell. A ring-shaped one arranged, wherein a slit facing the outer peripheral edge slit of the shell is formed in the outer peripheral edge, and a slit facing the inner peripheral edge slit of the shell is the inner peripheral edge And the inner core formed between the outer peripheral edge portions of both the shell and the inner core to the space between the inner peripheral edge portions of the shell and the inner core. In a brazing method for brazing the blade of a turbine runner comprising a blade formed with a projection that is bent in a manner to the shell and the inner core,
Hang a brazing material on the portion of the blade near the inner peripheral surface of the shell,
Bringing the brazing material into contact with the inner peripheral surface by centrifugal force generated by rotating the turbine runner;
A brazing method comprising brazing the blade to the shell by heating and melting the brazing material while maintaining the brazing material in contact with the inner peripheral surface. A bowl having an opening formed at the center, and a shell having a plurality of slits formed at a predetermined interval between the outer peripheral edge and the inner peripheral edge, and between the outer peripheral edge and the inner peripheral edge of the shell. A ring-shaped one arranged, wherein a slit facing the outer peripheral edge slit of the shell is formed in the outer peripheral edge, and a slit facing the inner peripheral edge slit of the shell is the inner peripheral edge And the inner core formed between the outer peripheral edge portions of both the shell and the inner core to the space between the inner peripheral edge portions of the shell and the inner core. In a brazing method for brazing the blade of a turbine runner comprising a blade formed with a projection that is bent in a manner to the shell and the inner core,
Hang a brazing material on the portion of the blade near the inner peripheral surface of the shell,
Brazing the blade to the shell by heating and melting the brazing material while keeping the brazing material in contact with the inner peripheral surface by centrifugal force generated by rotating the turbine runner. A brazing method characterized by.

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