JPS6216562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention mainly adjusts the electrical phase relationship by inserting the waveguide between the flange surfaces of the waveguide.
The present invention relates to a method of manufacturing a waveguide spacer used for adjusting the reactance size.

A waveguide spacer, also called a spacer flange, is a plate with a hole that is used between the waveguide flanges at the waveguide connection. This waveguide spacer has a thin plate shape and has the same function as a waveguide. Very high precision is required for the spacer that connects the waveguides, and the surface precision affects the leakage of microwave signals from the flange surface. Also,
The accuracy of drilling holes in the waveguide section and the positioning accuracy of the mounting holes for fixing the flanges together affect the amount of offset between the connected waveguides, and in order to minimize reflections due to signal discontinuity. For this purpose, the discrepancy in the waveguide inner diameter must be kept to a small value.

This waveguide spacer is used in large numbers to adjust the phase relationship by inserting it between the flanges of two waveguides, or to adjust the reantance by using it in short-terminated waveguides. ing. However, the problem with this waveguide spacer is that it is expensive. This is because similar high precision is required to achieve the same functionality as waveguides. The thin waveguide spacer is about 0.1mm, and the thicker one is about 0.1mm.
The thickness is about 10mm, and various thicknesses are used.Thickness can be obtained by stacking thinner ones, but it is cumbersome to handle, and when stacked, gaps are created, making the connection unstable. Therefore, stacking a large number of waveguide spacers is not practiced. A thin waveguide spacer of about 0.2 to 0.3 mm can be manufactured by a pressing method, and the cost is low and there is no problem. However, if the pressing or fine blanking method is applied to a material having a thickness greater than that, sagging, burrs, etc. are unavoidable, making it impossible to obtain a functionally good waveguide spacer. The inner diameter of this waveguide spacer needs to be highly accurate, and the holes in the waveguide section have been made by machining with a high-precision slicing machine or by machining with an electrical discharge machine. It is difficult to reduce costs using this method.

An object of the present invention is to provide a waveguide spacer that is lower in cost than conventional waveguide spacers and can have an arbitrary thickness, and a method for manufacturing the same.

According to the present invention, the holes for the waveguide and the holes for fixing the waveguide are made in one continuous manner by the wire cut electrical discharge machining method, and the guide can be made with any thickness, with high precision, and at a low cost. A wave tube spacer is obtained.

The present invention will be explained in detail below with reference to the drawings.

Figure 1 is a perspective view of a conventional waveguide spacer.
2 is a waveguide hole, and 2 is a mounting hole. The necessary conditions for a waveguide spacer are that the diameter of the waveguide is accurate, the relative position of the hole in the waveguide and the mounting hole is accurate, and the hole in the waveguide must be high. It is important to have high precision and no burrs or sagging, but conventional manufacturing methods have had the same problems as mentioned above.

FIG. 2 is a perspective view of an embodiment of the invention. This waveguide spacer has a waveguide hole 1 in the center and mounting holes 2 on the periphery, similar to the conventional one, and a narrow slot 3, which is a feature of the present invention, has a waveguide hole 1 in the center. and the mounting hole 2. In particular, the slot connecting the waveguide hole 1 and the mounting hole 2 is always provided at or near the center of the wide side (long side) of the waveguide, and the wide side of the waveguide opening The slot will not be pulled out from any point other than the center.

FIG. 3 is an explanatory diagram showing an example of the steps of the method for manufacturing a waveguide spacer of the present invention. First, a plate having the outer shape of a flange is made from a plate having the required thickness using an inexpensive method such as fine blanking. In this case, there will be some sag in the outer part, but this will not affect the part since it is not an electrically important part. At this time, drill a hole 5 in a suitable part of the board.
The positional accuracy of this hole is not very important.

Next, metal plates having the flange outline are stacked. The greater the stacked thickness, the greater the number of waveguide spacers that can be processed at once, but the maximum thickness is determined by dimensional accuracy and processing equipment. This stacking and fixing requires a simple jig, which is not shown in FIG.

After the stacked metal plates are set in a wire-cut electric discharge machine, a wire 50 that will become an electrode of the wire-cut electric discharge machine is passed through the hole 5. here,
A flange mounting hole 2 is cut out using an electrical discharge machine, then another mounting hole 2 is drilled, and then the holes are drilled in the order of drilling 1 for the waveguide. There is a high degree of freedom regarding this order of work, but in any case all holes are connected by slots 3. The dimensional accuracy of the diameter of this waveguide and the relative dimensional accuracy with respect to the mounting hole are mainly determined by the X and Y tables for feeding the workpiece, and very high accuracy can be obtained. Also, if the feed during machining is controlled by a computer, there will be no problem.

In the waveguide spacer of the present invention, a part of the wall of the waveguide is cut with a wire to form a slot. Since there is no tube wall current that crosses the center of the tube in a direction perpendicular to the axis, having a slot near the center of the wide surface has no functional effect.

In addition, since the waveguide spacer of the present invention connects the waveguide and the mounting hole with a slot, it is not as strong as a conventional waveguide spacer by itself, but the waveguide spacer is Since it is originally used by being sandwiched between the flanges of other waveguides, it does not pose any practical problems.

Although FIG. 4 is a front view of an embodiment of the present invention, various modifications to the shape are possible. For example, FIG. 5 shows one having a positioning hole 4 on the center line. In addition, Fig. 6 shows a method for machining the outer shape of the waveguide flange at one time, in which machining is started from one place on the plate 10 of an appropriate size using a wire cut electric discharge machine, and the outer shape and installation are completed. This shows a method for machining holes and waveguide holes all at once.

As explained above, according to the present invention, a large number of spacers can be processed at once, so the cost per spacer is lower than that of the conventional method. Also,
Since it can be processed freely from thin to thick plates, it satisfies the demands of the user. Furthermore, since the waveguide hole and the mounting hole are machined at the same time, high dimensional accuracy can be obtained, and the device is also excellent in functionality.

Furthermore, since the present invention does not require special electrodes compared to those manufactured using a normal electric discharge machine, there is no need to manufacture electrodes, and the cost is reduced.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional waveguide spacer, Figure 2 is a perspective view of a conventional waveguide spacer.
The figure is a perspective view of an embodiment of the present invention, Figure 3 is an explanatory diagram of the processing method of Figure 2, Figure 4 is a front view of Figure 2, and Figure 5 is a second embodiment of the invention. FIG. 6 is a front view of a third embodiment of the present invention. In the figure, 1... Waveguide hole, 2... Mounting hole, 3... Slot, 4... Positioning hole.

Claims (1)

[Claims] 1. In a method of manufacturing a waveguide spacer used by being inserted into a waveguide flange, a hole forming a waveguide portion and a hole provided to be fixed to the flange surface with screws are provided. A wire cut electrical discharge machine is used to connect the plurality of screw holes in a continuous manner, and in this case, a slot passing through the center of the wide surface of the waveguide hole is formed using the processing machine. A method for manufacturing a waveguide spacer, characterized in that the above-described continuous processing is performed through this slot.