JPS6225476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impeller welding jig used when welding blades to the hub of an impeller to form an impeller.

For example, in a relatively small impeller such as a flowmeter impeller, there is a shaft hole provided on the outer circumferential surface of the hub in a staggered manner with respect to the shaft hole in the center. Generally speaking, a plurality of blade insertion grooves are cut in a manner that they do not intersect with each other, the blade is inserted into these blade insertion grooves, and the joint portion with the hub is welded.

Welding jigs are used to efficiently carry out such manufacturing and enable mass production, but conventional jigs only rotate the hub, so they cannot be used, for example, in a vacuum chamber. In the case of electron beam welding, the hub with the blade inserted together with the jig is placed in a vacuum chamber to create a vacuum, the joints on the same side of each blade are first welded, and then the vacuum chamber is completely welded. I was forced to do the complicated work of simply returning the hub to atmospheric pressure, resetting it so that the joints on the hub were in the opposite direction, creating a vacuum again, and then welding the remaining joints. There is. Further, when welding is performed by laser welding or the like, although the above-mentioned vacuum-related labor is saved, the position of the hub must be reset, which is still quite complicated.

An object of the present invention is to provide an impeller welding jig that can avoid the above-mentioned complicated operations.

This will be explained below based on a specific example.

As shown in FIG. 1, an impeller 1 to which the present invention is applied consists of a hub 2 and a blade 3 welded to the hub 2, and the outer peripheral surface of the hub 2 has a plurality of blade insertion grooves. 4, 4... is engraved. Each of the blade insertion grooves 4, 4, . That is, when the outer circumferential surface of the hub 2 is unfolded, the outer circumferential surface of the hub 2 is arranged so that the blade insertion grooves 4, 4, . A predetermined number of them are provided in the shaft hole 5 (the shaft center 6 of the shaft hole 5), so that they are staggered.

The welding jig of the present invention is constructed as shown in FIGS. 2 and 3.

The rotating body 10 is a first plate 11 located on the lower side.
and a second plate located above the first plate 11.
It consists of a plate 12. Three elongated holes 13 are provided on an arc of arbitrary radius on the periphery of the second plate 12,
The second plate 12 is fixed to the first plate 11 by screwing the bolt 14 that passes through the long hole 13 into the first plate 11, and can be slightly rotated in the circumferential direction by the length of the long hole 13. .

A pair of brackets 15, 15 are provided to protrude downward from the end of the first plate 11, and each bracket 1
A rotation shaft 16, which is loosely inserted into holes drilled in holes 5 and 15, is fixed to a support column 17, so that the first plate 11 can rotate around this rotation shaft 16. A roller 1 which is a cam follower is attached to the other end of the first plate 11.
A cam 2 rotated by an electric motor 20 mounted on a base 19 is attached to the roller 18.
1 is engaged with the cam 21, and the rotation of the cam 21 causes the roller 18, and therefore the rotating body 10, to rotate around the rotating shaft 16.
It will rotate around. The support columns 17, 17 are also fixed to the base 19, and although not shown, the base 19 is made of a known method, for example,
Since it is movable in the horizontal plane on the XYZ table in the front-rear direction perpendicular to the page, the left-right direction, and the vertical height direction, as a result, the support column 17,
The rotating body 10 supported by 17 also has front and back, left and right sides,
Move up and down.

On the second plate 12, a pair of bearing seats 22,
22 are arranged. As shown in FIG. 4, this bearing seat 22 has a deep groove 23 formed from its upper end, and as shown in FIG. 1
The second plate 12 is fixed to the second plate 12 so as to form a constant angle α with respect to the second plate 12 . Further, when the mounting shaft 24 is inserted into the deep grooves 23, 23 and set in a state of use, the mounting shaft 24 is placed in the deep grooves 23, 23 so that it is parallel to the horizontal plane including the axis of the rotating shaft 16.
form 3. Furthermore, the angle α is the mounting axis 2
Attach hub 2 with blade 3 inserted to 4,
When the mounting shaft 24 is positioned in the bearing seats 22, 22, the joint between the hub 2 and the blade 3, and therefore one of the blade insertion grooves 4, is in a direction substantially parallel to the rotation shaft 16. It is reserved for Therefore, fine adjustment of this angle α can be done by loosening the bolt 14.
This is done by rotating the second plate 12 with respect to the first plate 11.

The mounting shaft 24 has a gear 25 at one end, which meshes with a gear 27 fixed to the shaft of a stepping motor 26 mounted on the second plate 12. The mounting shaft 24 passes through a sleeve 29 having collars 28 at both ends.
9 is held between the shoulder 31 of the mounting shaft 24 and the tightening nut 30, and is fixed at a fixed position on the mounting shaft 24. The spacing between the collars 28 and 28 of the sleeve 29 is slightly larger than the axial width W of the bearing seat 22, and when the sleeve 29 is inserted into the deep groove 23,
The collars 28, 28 are attached to the bearing seat 22 as shown in FIG.
The mounting shaft 24 is located in a state with the collars 28 interposed therebetween, and movement of the mounting shaft 24 in the axial direction is prevented by each collar 28. As mentioned above, the cylindrical sleeve 32 is inserted from the other end of the mounting shaft 24 with the gear 25 and sleeve 29 fixed to one end, and then the hub 2 with the blade 3 inserted into the blade insertion groove 4 is inserted. Insert the impeller 1 onto the mounting shaft 24 by inserting the spacer 33...
and spacers alternately, position the spacer 35 having the collar 34 on the other end of the mounting shaft 24, and abut the locking nut 36 from the outside, and install the impellers with each impeller sticking out at a constant interval. It is attached to the shaft 24. Then, a sleeve 37 is attached to the other end of the mounting shaft 24, and this sleeve 37 is fitted into the deep groove 23 of the bearing seat 22.

The impeller welding jig of the present invention having the above configuration is used as follows.

First, each impeller is temporarily fixed to the mounting shaft 24 so that the blades 3 of each impeller are in the same direction and in the same phase. When the mounting shaft 24 with the impeller temporarily fixed in this way is inserted into the deep groove 23 of the bearing seats 22, 22, the collars 28, 28 of the sleeve 29 and
The action of the collar 38 of the sleeve 37 restricts the axial displacement of the mounting shaft 24, and the gear 25 provided on the mounting shaft 24 meshes with the gear 27. Then the second
The plate 12 is held horizontally (as indicated by the solid line in FIG. 3), and the stepping motor 26 is used to position the plate 12 so that one blade of every impeller is vertical. The entire welding jig set as described above is put into a vacuum chamber (electron beam welding chamber), or the above-mentioned operation is performed inside the vacuum chamber.

In this type of welding machine, the electron beam is generally positioned vertically upward, so the second plate 12 is
In the horizontal state as shown in the figure, the beam enters the blade 3 from directly above, making welding impossible. Therefore, in the present invention, the angle of the second plate 12 is changed by the cam 21 to obtain a predetermined angle of incidence β. As shown in FIG. 3, when the second plate 12 is in the downwardly rotated position,
The beam is projected onto the joint 3a of the impeller shown in FIG. 1 at an incident angle β, and when the second plate 12 is rotated upward and is in the position, The beam is projected at an angle of incidence β. By the way, in the impeller to which the present invention is applied, the blade insertion grooves are staggered as described above, so the mounting shaft 24 to which the hub is fixed is set in the bearing seats 22, 22, and one of the blade insertion grooves is staggered. Even if the second plate 12 is positioned parallel to the rotation axis 16, the height from the second plate 12 to the blade insertion groove differs at various locations in the blade insertion groove. Therefore, the height of the joint where the hub and blade are to be welded is different, so if the electron beam is positioned at a constant height in the vertical direction, the focus of the electron beam will be on the weld when welding along the joint. Situations occur where you are unable to get everyone together in your department.

For this purpose, in the present invention, the rotating body, and therefore the mounting shaft 24, is rotated around the rotating shaft 16,
Although the joint portion is made to have a substantially constant height from the axis of the rotation shaft 16 over its entire length, this rotation angle is the incident angle β. In other words, the angle of incidence β is selected such that the joint of the blade is at a substantially constant height from the axis of the pivot shaft 16 over its entire length, so that the electron beam at a constant height does not disturb the joint. The shape of the cam 21 is determined so as to provide such an incident angle β.

As described above, the second plate 12 is moved to the lower position or the upper position by the cam 21.
is rotated and held in this state, the mounting shaft 24 is stepped by a step corresponding to the pitch of the blade by the stepping motor 26, and the base 19 is moved in one direction in the horizontal plane to join one blade. After welding the parts, the base 19 is returned in the opposite direction to the above direction, the mounting shaft 24 is advanced, and the same operation is performed to weld all the joints on the same side, such as the joints of the next blade. . Then cam 2
1, and rotate the second plate 12 to a position different from the position at the time of welding, that is, if the first weld is the position, to the position, and conversely, if the first weld is the position, the second plate 12 is turned to the position. Maintain this state. Thereafter, the mounting shaft 24 is moved forward again by the stepping motor 26 to weld the joint on the other side. After welding of one impeller is completed in this way, the base 19 is moved in two directions in the horizontal plane and its height is changed to guide the next impeller to a precise position below the electron beam, and similarly. Perform welding.

In the above, as an optimal example of welding in a vacuum chamber using an electron beam, a mode has been described in which the mounting shaft 24 is stepped by a stepping motor and the cam 21 is rotated by the electric motor 20.

With this configuration, all operations can be performed automatically using external signals programmed in advance, which is most preferable when mass producing impellers. However, when using an impeller with a special shape that cannot be mass-produced, instead of a stepping motor,
The mounting shaft 24 may be rotated manually, and the cam 21 may be similarly rotated manually.

In addition, instead of the cam, a member that allows the second plate to take a horizontal position, a downward position, and an upward position, that is, a member having three step-like steps, can be applied to each step. It can also be configured to have a predetermined height. Also base 1
9 can be fixedly provided without being moved in two mutually orthogonal directions and in a vertical direction in a horizontal plane, and the electron beam can be moved in three directions, for example.

According to the present invention configured as described above, it is easy to confirm the welding position of each blade, and both sides of the blade can be welded without changing the orientation of the welding jig, increasing welding efficiency and reducing man-hours. reduction is possible. It is also possible to sequentially weld the joints located on both sides of each blade, which prevents blade deformation due to welding strain even when the blade is made of thin plate, where deformation of the blade is a problem. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an impeller welded by the welding jig of the present invention, Fig. 2 is a plan view of the welding jig of the present invention, and Fig. 3 is a front view of the same, with the impeller attached and walking. The advancing mechanism is omitted, and FIG. 4 is a sectional view taken along the line -- in FIG. 2. 1... Impeller, 2... Hub, 3... Blade,
4... Blade insertion groove, 10... Rotating body, 16...
... Rotation shaft, 17 ... Support column, 18 ... Roller, 21
...Cam, 24...Mounting shaft, 26...Stepping motor.

Claims (1)

[Scope of Claims] 1. A blade is formed by inserting a blade into each blade insertion groove of a hub that has a plurality of blade insertion grooves cut in the outer peripheral surface in a staggered manner with respect to the shaft hole provided in the center of the hub. An impeller welding jig used when welding the joint between the hub and the blade of the impeller includes a rotating body that is rotatable around the rotation axis, and a blade that is inserted when the impeller is attached. A mounting shaft is attached to the rotating body so that one of the grooves is substantially parallel to the rotating shaft, and is rotated intermittently at a predetermined angle. An impeller welding jig configured to weld the joint between the blade and the blade. 2. The impeller welding jig according to claim 1, wherein the device shaft is rotated by a predetermined angle by a stepping motor. 3. The rotating body is plate-shaped, one end of which is attached to the vertical support via the rotating shaft, and the lower surface of which engages with the cam via a cam follower. Or the impeller welding jig described in Section 2. 4. The impeller welding jig according to claim 3, wherein the support and the cam are fixed on a base that is movable in the horizontal and vertical directions.