JPS6029207Y2 - Expansion of waveguide end - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push-expansion method for shaping the end of a waveguide into a brim-like shape.

When connecting a waveguide and an impedance converter, the end of the waveguide is sometimes expanded into a flange shape, and the flange is connected to the converter by a so-called flange.

In this case, to form a flange at the end of the waveguide, an expander having a tapered core is press-fitted into the end of the waveguide, and by this press-fitting, the end is expanded into a tapered shape as shown in FIG. Next, as shown in FIG. 9, a method is used in which the tapered expansion section is pressed with a pusher P' having a core section 30' for the non-expansion waveguide section.

However, with such a processing method, the arc diameter of the corner streetcar shown in FIG. 9 becomes considerably large, and there is concern that the susceptance generated in this arc portion may adversely affect the electrical characteristics.

In particular, the occurrence of the above susceptance is noticeable in waveguides that are used at high frequencies, that is, waveguides with small diameters.
A decline in electrical characteristics is inevitable.

Furthermore, in the above-mentioned flange processing method, as shown by g in FIG. 9, bulging of the inner surface of the waveguide portion near the flange, so-called polar buckling, is unavoidable.

However, since this buckling is not uniform in the circumferential direction and is irregular, there is a problem that the electrical characteristics inevitably become unstable.

The pushing expansion of the waveguide end according to the present invention has a configuration that can solve the above-mentioned difficulties in processing the flange. Regarding the expansion in which the waveguide is expanded into a brim shape so as to have a corner angle, a core portion that is closely inserted into the non-expansion waveguide portion adjacent to the tapered portion is provided to protrude perpendicularly to the flat front surface of the base. The present invention is characterized in that an annular frame portion is provided for regulating pressure on the outer periphery of the collar.

Hereinafter, the present invention will be explained in the case of an elliptical waveguide with reference to the drawings.

FIG. 1 shows the end of the waveguide which is processed into a flange shape by the present invention and expanded into a tapered shape.

This expansion can be carried out using, for example, the expander (Jetko Sho 551-1), which will be described later.
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FIG. 2 shows the flange at the end of the waveguide formed by the expansion according to the present invention, the angle α is 90°, and the corner point a corresponds to the base point a of the taper in FIG.

FIG. 3A shows a front view of the press expansion according to the present invention, and FIG. 3B shows a cross section taken along line BB in FIG. 3A.

In FIGS. 3A and 3B, 1 is a base body whose front surface 2 is a flat surface, and in the center of the flat front surface 2 is a core that is closely inserted into the non-expanding waveguide section A in FIG. A portion 3 is provided to protrude vertically.

Reference numeral 4 denotes a frame portion provided on the flat front surface 2, and is for regulating the outer periphery of the flange.

The function of this annular frame portion 4 will be described later.

In order to form a flange at the end of a waveguide by the press-expansion method of the present invention, the press-expander P of the present invention is press-fitted into the tapered waveguide end portion shown in FIG. 1, as shown in FIG. .

In FIG. 4, 5 is a chuck. By press-fitting the pusher P, the tapered part (Fig. 1) is gradually expanded into a brim shape.
At the final stage of this expansion, as shown in Figure 4, the tsuba f
The outer periphery of the flange f is pressed against the inner periphery of the frame 4, and the outer periphery of the collar f is pressed from the frame 4 toward the center.

This pressurization causes the flat front surface 2 and core portion 3 of the press expansion P to
The waveguide material is pressed onto the right-angled entry corner ', and the inner peripheral edge of the flange f is formed into a right-angled exit corner.

Further, the inner circumference of the collar and the inner surface of the waveguide portion in the vicinity thereof are processed and formed by the outer circumferential surface of the core 3 due to the above-mentioned pressing force.

Therefore, the above-mentioned problem of irregularity due to local buckling is resolved by regulation by the outer circumferential surface of the core.

Furthermore, variations in the inner diameter of the waveguide are also restricted in the waveguide portion.

As described above, by forming a flange at the end of the waveguide using the push expansion method of the present invention, it is possible to prevent the arc diameter of the inner periphery of the flange from increasing and to prevent the inner periphery of the flange and the inner periphery of the waveguide end in the vicinity thereof from increasing. Uniform dimensional regulations can be satisfactorily achieved, and the waveguide can be connected to a converter etc. with good electrical characteristics.

In the present invention, the pressing device shown in FIG. 5, for example, is used.

In FIG. 5, reference numeral 6 denotes a frame body, into which a push rod 7 of a set of screws is inserted, and a worm gear 8 is screwed into the push rod 7.

9 is a bundle 10 which is a worm that meshes with the worm gear 8; 11 is a key mechanism for the push rod 7;
The press rod 7 is reciprocated by the vertical movement of.

Reference numeral 12 denotes a chuck holder, and the end of the waveguide is held by a bolt 14 via a chuck 13 that splits into two.

The tapered expansion of the end of the waveguide shown in FIG. This is done by press-fitting the expansion 9 into the waveguide end.

In this case, the taper expansion extension T has bottom portions with different taper angles, and the end portion of the waveguide is gradually expanded through several stages of taper expansion.

FIG. 6A and FIG. 6B show a partially cutaway side view and a top view of an example of a taper opening extension, showing a locking piece 15 and a screw 16.
As shown in FIG. 5, it is attached to the tip of the pressing rod 7.

Further, a ball receiver groove 17 is provided on the tip end surface of the pressing rod 7, and the ball 18 of the tapered expander T is supported in this ball receiver groove 17.

19 is a spring for pressing the ball, and 20 is a screw for holding the spring.

Reference numeral 21.21 denotes a stopper attached to the expander T, and this stopper 21.21 restricts the amount of press-fitting of the expander T into the end of the waveguide.

Figures 7 and 8 show several other extensions T', T''.

Due to the multiple extensions mentioned above (the order of expansion usage is T"→T
'→T), after the end of the waveguide has been expanded into a tapered shape as shown in Figure 1, the press expander P of the present invention is attached to the press rod of the press tool, and the flange forming described above is performed. It is done.

The press expander of the present invention is attached to the press rod in the same manner as the taper expanders 'l', T', and T'' described above.

In FIG. 3B, 15 is a locking piece, 18 is a ball, 19
2 indicates a spring, and 20 indicates a presser screw.

In addition, the frame portion 4 in the push expansion device of the present invention is the stopper in the taper expansion device described above (see FIG. 6A).

It also has the function 21) in Fig. 3B, and the height h of the frame portion 4 in Fig. 3B is the same as the height h of the stopper 21 in Fig. 6A.
This corresponds to '' and is made to match the thickness of the flange after the flange is formed.

The heights h' of the stoppers of the plurality of expanders are successively reduced in accordance with the order in which the expanders are used.

As mentioned above, according to the present invention, the end of the waveguide can be shaped into a hook-shaped bottom that is advantageous in terms of electrical properties for connection with a transducer, etc., which improves and stabilizes the electrical properties of the waveguide connection part. Extremely useful.

Figure 10A shows the VSWR characteristics of an elliptical waveguide when the flange is formed and mechanically connected with the expansion according to the present invention. This is the VSWR characteristic of the same elliptical waveguide when the elliptical waveguide is mechanically connected and has a flange formed with (4 omitted), and from the comparison of these characteristics, it is clear that the electrical properties are improved and stabilized.

Note that the present invention can be used not only for molding the collar of an elliptical waveguide, but also for molding the collar of a circular waveguide, etc. In this case, the shape of the outer periphery of the core and the inner periphery of the frame depends on the shape of the waveguide and the inner periphery of the frame. It is changed depending on the shape of the outer circumference of the collar.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the waveguide end expanded into a tapered shape, Fig. 2 is an explanatory diagram showing the flange of the waveguide end formed by pressing and expanding according to the present invention, and Fig. 3A is an explanatory diagram showing the waveguide end expanded into a tapered shape. FIG. 3B is a sectional view taken along line B-B in FIG. 3A, FIG. 4 is an explanatory view showing the flange forming state by the press expansion of the present invention, and FIG. 5 is a pressing tool. Explanatory diagrams to show, Figure 6A and Figure 6
Figure B is a partially cutaway side view and front view showing the expander used for taper processing in Figure 1, and Figures 7 and 8 are partially cutaway side views and front views showing other expanders. FIG. 9 is an explanatory diagram showing a state of flange forming by conventional pressing and expanding. Explanatory drawings, FIG. 10A is a drawing showing the electrical characteristics of an elliptical waveguide whose flange is formed by pressing and expanding according to the present invention and mechanically jointed, and FIG. 10B is a mechanical joint whose flange is formed by pressing and expanding as a comparative example. 2 is a drawing showing the electrical characteristics of an elliptical waveguide. In the figure, 1 is a base, 2 is a front surface, 3 is a core portion, and 4 is an annular frame portion.

Claims (1)

[Scope of utility model registration request] Regarding the expansion in which a tapered waveguide end is expanded into a flange shape so that the base point of the tapered part is at a corner angle of 90°, a non-expanded waveguide adjacent to the tapered part. A core part that is tightly inserted into the part is vertically protruded from the flat front surface of the base part, and an annular frame part is provided for pressurizing and regulating the outer periphery of the flange formed by the waveguide end part expanded on the front surface from the outer periphery side. 1. A push-up expansion of a waveguide end, which is characterized by a protrusion.