JPH0570892B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a magnetron anode, and particularly to a method for fixing an anode cylinder and an anode vane.

(Prior Art) A magnetron anode has a structure in which a plurality of anode vanes are radially fixed to the inner periphery of an anode cylinder, and every other anode vane is electrically short-circuited by a pair of strap rings. In its manufacture, generally a copper anode vane is positioned and placed inside a copper anode cylinder using a brazing jig, and a brazing material is placed at the location to be welded and heated at high temperature.
solder. Naturally, one set of brazing jigs is required for each anode assembly, and a large number of these jigs are required, especially in mass production of magnetrons for microwave ovens. The brazing jig used in this brazing process can withstand repeated use at temperatures as high as 700°C, with little dimensional change.
It must also be made of a material with low thermal expansion. For this reason, the jigs used in such brazing are expensive and subject to considerable wear and tear. In addition, the groove for installing the vane in such a jig is made to be a little larger than the plate thickness of the vane in order to facilitate the installation of the anode vane and to take into account the difference in thermal expansion between the vane and the jig during the brazing process. It needs to be made larger in size. For this reason, it is not possible to obtain very high precision in the mutual positions of the vanes, especially in the mutual spacing between the vane tips, which has the greatest influence on the high frequency characteristics of the resonant cavity.

A method of soldering such an anode structure without using a soldering jig has already been proposed in the
It is disclosed in Publication No. 57-18664. This is a method in which, prior to soldering the components of the anode structure, mutual joints are temporarily fixed by welding, and then the components are brazed without using a jig. Although this solves the above-mentioned problems, it is still necessary to use the jig mentioned above to determine the spacing between each vane during temporary fixing, which still makes it difficult to obtain sufficient dimensional accuracy. There is.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for manufacturing a magnetron anode that allows the mutual positional relationship of anode vanes and the like to be assembled with high accuracy.

[Structure of the Invention] (Means for Solving the Problems) The present invention is characterized in that the process of fixing a plurality of anode vanes to the inner periphery of an anode cylinder is a positioning process in which each vane is movable in the radial direction. Arrange the spacer jigs, insert each anode vane with each spacer jig opened outward, then close each spacer jig inward to sandwich the anode vanes at predetermined intervals, and in this state This is a method for manufacturing a magnetron anode in which each anode vane is fixed to an anode cylinder by caulking, welding, or the like.

(Function) According to the present invention, since each vane is mounted and fixed at a predetermined interval using a vane positioning spacer jig that can be opened and closed in radial directions in a normal temperature environment, it is possible to assemble with high dimensional accuracy. I can do it.

(Example) An example will be described below with reference to the drawings. Note that the same parts are represented by the same symbols.

In the method for manufacturing a magnetron anode of the present invention, in the step of positioning the anode vane, the steps shown in FIGS.
The device is assembled as shown in the figure, but first the structure in the completed state will be explained with reference to FIGS. 3 to 5.

That is, on the inner periphery of an anode cylinder 31 made of copper, a plurality of anode vanes 32, 32, . . . , also made of copper, are provided to protrude radially. The copper inner strap ring 33 and outer strap ring 34 are connected to the strap ring attachment grooves 35 and 34 of each vane.
..., and every other one is electrically shorted. Each vane also includes a plurality of protruding pieces 36, 36 formed on the anode cylinder 31 for temporarily fixing the vane.
The anode is mechanically caulked and fixed, and the contact surface with the inner surface of the anode cylinder is soldered with silver solder or the like. Reference numeral 37 represents the soldered portion. Each strap ring 33, 34 has a reference numeral 38.
It is soldered to each vane at the soldered part shown in . In the figure, reference numeral 39 represents an airtight joint where the abutting portions of the anode cylinders are soldered together, 40 represents an extrusion hole on the outer periphery of the anode cylinder in which a protruding piece is formed, and A represents an output antenna lead. In the space surrounded by the inner end surface of each vane, electron-emitting cathode groove bodies (not shown) are arranged at predetermined intervals, and the space between them becomes an electron action space.

Next, the manufacturing procedure of this magnetron anode will be illustrated.

First, a copper flat plate material 41 for an anode cylinder as shown in FIG. 6 is prepared. This is rolled into a cylindrical shape as shown in FIG. The abutting portions 42 parallel to the axis are kept in close contact as much as possible. Next, as shown in FIG. 8, a tapered surface 43 is formed on the outer peripheral surface of the rounded cylinder, that is, the anode cylinder 31, in order to make it easier to press-fit the radiator later, and pole pieces (not shown) are fitted to both ends, and a metal A step portion 44 for welding the container is formed by cutting.

Next, as shown in FIG. 9, a protrusion piece 36 is formed from the outer periphery of the anode cylinder 31 using a protrusion tool 45. The tool 45 is provided with a protrusion 45a at a predetermined position, which is inserted into the outer circumferential wall of the anode cylinder to about half its wall thickness, thereby extruding and molding the protrusion piece 36 on the inner circumference. Each protruding piece 36 is
A pair of anode vanes (not shown in the figure) are formed at two locations, one above the other, corresponding to the location where the anode vanes are to be joined.
The distance between the pair of protruding pieces is set to be slightly wider than the width dimension of the vane so that the vane can be easily inserted between these protruding pieces later.

On the other hand, separately, an anode vane 32 as shown in FIG. 10 is prepared. That is, the vane 32 having the shape shown in the figure is formed by press punching from a copper flat plate having a predetermined thickness. Above and below near the inner edge of the pane,
Strap ring mounting grooves 35, 35 are formed. These grooves 35 are formed with a large groove part 35a through which the strap ring passes without contact, and a small groove part 35b continuous with the large groove part 35a through which the strap ring contacts and is locked with the vane. This strap ring joining groove 35b is
It has a shape and dimensions that approximately correspond to the cross section of the strap ring. In particular, it is formed to have an overhang portion 35d that protrudes from the inner portion 35c by a dimension t of, for example, about 0.3 mm. This allows you to later attach the strap ring to the inner part of this groove 35.
The strap ring is designed to prevent it from coming off if it is glued inside c. Note that a slit 46 for connecting an antenna lead is also formed on one side of the vane. Ten such vanes 32 are prepared for one anode structure.

Next, as shown in FIGS. 11 to 13, the anode cylinder 3 is attached to the vane positioning spacer jig 50.
Attach 1.

The vane positioning spacer jig 50 has ten L-shaped movable parts 51. Each L-shaped movable part 51 has a spacer part 52 extending vertically, and a drive part 53 extending radially from the lower end of the spacer part. This drive unit 53 is connected to a drive device (not shown) and is movable in the radial direction. A stepped vane holding portion 54 for holding a vane is formed in the spacer portion 52 . Further, a cylindrical center positioning rod 55 is provided at the center of the device.

The anode cylinder 31 is attached to the spacer jig 50, and all the L-shaped movable parts 51 are opened outward as indicated by the arrow _F0 . In this state, the distance between adjacent spacer parts is larger than the thickness of the anode vane. In this state, as shown in FIG.
2 is inserted radially and placed on the vane holding portion 54. The outer end of each vane is positioned inside the pair of upper and lower protruding pieces 36.

Next, as shown in FIGS. 1, 2, and 15, each driving portion 53 of the spacer jig 50 is
Close inward like Fi. At that time, each vane 32
is pressed down from above by a holding jig 56 and held by the vane holding portion 54. The spacer portions 52 that have moved inward sandwich the anode vanes therebetween, maintain a predetermined spacing, and mechanically hold the anode vanes firmly.

In this state, each protruding piece 36 is then obliquely crushed from the outside as indicated by the arrow P shown in FIG. 1 using the caulking tool 57, and the anode vane is mechanically caulked and fixed by the pair of protruding pieces. This caulked part is marked 36a.
However, the caulking portion is not shown in other figures. These vane positioning and caulking processes can be performed by automatic machines.

In this way, the anode vane 32 is mechanically and firmly temporarily fixed inside the anode cylinder 31 by caulking the protruding piece 36. Thereafter, the spacer portion of the jig is opened outward again and the anode assembly is removed from the jig. In addition, when we conducted an experiment in which the diameter and height of the protruding pieces were 2 mm, each vane was fixed firmly enough and did not deform even when a load of approximately 3 kg was applied to the inner end of the vane and an attempt was made to bend it. .

On the other hand, inner and outer strap rings 33 and 34 as shown in FIG. 17 are formed from a copper round bar material 47 as shown in FIG. 16. These are made by bending a round bar into a ring shape to have a predetermined diameter, forming the mating parts 33a and 34a closely together, and plating the outer surfaces of the bars with silver to a predetermined thickness to serve as solder. Keep it covered.

Next, these pair of strap rings 33, 34 are attached to the grooves 35 of each vane. At that time, first, as shown in FIG. 18, open the rounded butt part 42 of the anode cylinder 31 slightly as shown by the arrow, and insert the outer strap ring 34 shown in FIG. 17 into the small groove.
This groove deep part 35c of the vane where 5b is located on the outside
Attach to. And the butt part 42 of the anode cylinder 31
is closed by its spring back action, and this outer strap ring 34 is lightly press-fitted into the groove deep part 35c. In this way, as shown in FIG.
will be installed on the Note that this strap ring joining groove deep part 35c has a shape and dimensions that approximately correspond to the cross section of the strap ring, and also has an overhang part 35d that protrudes from it, so that the strap ring is mechanically and stably locked. and will not fall off. Next, as shown in FIG. 20, the inner strap ring 33 shown in FIG. 17 is attached to the groove deep part 35c of the vane, with the mating part 33a slightly opened as shown by the arrow, and the small groove 35b located inside. In this way, if the inner strap ring 33 is opened a little more than the dimension of the overhang part 35d of the vane, the deep part 35c of the groove 35b can be easily opened.
It can be attached to. When the strap is closed by the spring-back action of the strap ring, it can be lightly press-fitted into the groove in a mechanically stable manner and will not come off.
In this way, the pair of strap rings can be installed in the grooves of the anode vane as shown in FIG. 13 and temporarily fixed mechanically.

Next, as shown in FIG. 21, a silver brazing material 50a is placed on the contact portion between the anode cylinder and the vane, especially on the portion sandwiched between the protruding pieces 36, and as shown in FIG. A brazing material 48 is inserted between the abutting portions 42 of the anode cylinder. Then, as shown in FIGS. 23 and 24, the anode structure is installed inside the support cylinder portion 49a of the ring-shaped outer periphery regulating jig 49 surrounding the outer peripheral wall of the anode cylinder. In this state, the anode assembly is placed in a high-temperature brazing furnace, and the parts to be soldered, the strap ring, and the vane are brazed. In these steps, each vane is only regulated in position by caulking and fixing with a protruding piece, and can be carried out without using a vane positioning jig. In this way, the magnetron anode shown in FIGS. 3 to 5 is obtained.

In the embodiment shown in FIGS. 25 and 26, circumferential projecting pieces 61 and grooves 62 for mounting the brazing material are formed on the upper and lower sides of the anode cylinder 31, and the anode vane 32 is After positioning with a spacer jig as shown in FIG. After that, attach the strap ring in the same way and solder it at the predetermined points.

In the embodiment shown in FIG. 27, a wedge-shaped vertical groove 64 corresponding to the vane position is formed in the anode cylinder 31, and a spacer jig is similarly used to form the wedge-shaped vertical groove 64 in the anode cylinder 31.
2 is inserted and positioned, the end of each vane is caulked as shown by arrow P, and the vane is temporarily fixed mechanically with the caulking fixing part 63. Then, a brazing material (not shown) is placed in the vertical groove and soldered.

In the embodiment shown in FIG. 28, a pair of vertically long protrusions 36, 36, . The vane is attached, temporarily fixed using the caulking portion 36a, and then soldered. According to this, it is easier to attach the anode vane, and the caulking position can be selected relatively arbitrarily.

In the above embodiments, the anode cylinder is formed by rounding a flat plate material, but the present invention is not limited to this, and a pipe-shaped material may be cut into a predetermined size and used as the anode cylinder. Further, in addition to caulking, any fixing method such as welding that does not expose the entire body to a high temperature atmosphere can be used to fix the anode cylinder and the vane.

[Effects of the Invention] As explained above, according to the present invention, each vane is mounted and temporarily fixed at a predetermined interval using a vane positioning spacer jig that can be opened and closed in a radial direction in a normal temperature environment. Therefore, it can be assembled with high dimensional accuracy.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main part showing the vane temporary fixing process of one embodiment of the present invention, Fig. 2 is a partial cross-sectional view thereof, Fig. 3 is a cross-sectional view showing the completed state, and Fig. 4 is the same. 5 is a perspective view thereof, FIGS. 6 and 7 are perspective views showing the anode material in the manufacturing process, FIG. 8 is a half-sectional view showing the anode cylinder in the subsequent process, and FIG. The figure is the judgment surface diagram in the subsequent process, the first
Figure 0 is a perspective view of the anode vane, Figures 11, 12 and 13 are partial perspective views, half sectional views and longitudinal sectional views showing the state of the spacer jig and the anode cylinder, and Figures 14 and 15. 16 and 17 are perspective views and plan views showing the strap ring, FIG. 18 is a perspective view of the main parts in the subsequent process, and FIG. 20 is a top view of the inner strap ring, FIG. 21 is a partial perspective view of the subsequent process, and FIG. 22 is a perspective view showing the brazing material.
23 and 24 are a cross-sectional view and a vertical sectional view of the main part in the soldering process, and FIGS. 25 and 26 are a half-sectional view and an inner view of the main part showing other embodiments of the present invention. , FIG. 27, and FIG. 28 are perspective views of main parts showing still other embodiments. 31... Anode cylinder, 32... Anode vane, 3
6, 51... Projection piece, 36a, 63... Temporary caulking part, 37, 38... Brazing part, 50... Spacer jig for vane positioning, 52... Spacer part, 53... Drive part, 54 ...Vane holding part,
Fo, Fi...Movement direction of the spacer jig.

Claims (1)

[Claims] 1. In a method for manufacturing a magnetron anode in which a plurality of anode vanes are radially fixed to the inner periphery of an anode cylinder, the step of positioning and fixing the anode vanes includes fixing the anode vanes radially between each vane. Arrange movable positioning spacer jigs, insert each anode vane with each spacer jig opened outward, and then close each spacer jig inward to place each anode vane in a predetermined position. A method for manufacturing a magnetron anode, characterized by sandwiching the anode vanes at intervals and fixing each anode vane to an anode cylinder in this state.