JPS6331202A - Manufacture of corrugate horn - Google Patents

Abstract

PURPOSE:To obtain a corrugate horn with high dimension accuracy and high performance by inserting corrugated rings in the inner face of a main body sequentially stepwise from the small diameter toward the larger diameter side. CONSTITUTION:Parallel inner circumferential faces fitted with individual corrugated rings (2-1-2-n) are formed in the inner face of a main body 1 in conical step shape. The corrugated rings (2-1-2-n) have a corrugation 2 projected in an inner diameter direction at one end and a large diameter inner circumferential face being a slot at the other end. The corrugated rings (2-1-2-5) are inserted to the stepped cylinder hole of the main body 1 in the order of smaller inner diameter of a taper 1-4 and a retaining ring 3 is inserted finally. The end face circumference of the ring 3 of the main body 1 is welded by an electron beam welding machine. Thus, the corrugate horn with high dimension accuracy and high performance is obtained.

Description

[Detailed Description of the Invention] [Summary] A parallel inner circumferential surface is formed on the inner surface of the main body in the shape of a conical step, and each of the fins and grooves is integrated into a ring with fins having a cylindrical outer periphery. , a method of manufacturing high-precision corrugated horns by inserting them into the holes of the main body.

[Industrial application field]

The present invention relates to a method for manufacturing a corrugated pawn to be attached to a parabolic antenna for microwave communication.

In particular, there is a need for a new method for manufacturing corrugated horns that is highly accurate and easy to manufacture.

[Conventional technology]

The method of manufacturing a corrugated horn that has been widely used in the past is to grip a round bar of hard copper or bowl copper with a chuck (not shown), as shown in the cross-sectional view (8) in Figure 2. After rough machining and finishing of the mounting surface 1-1 and the outer periphery of its flange, drill the pilot holes of the entrance hole 1-2 and the tapered part 1-4 into a stepped shape. The entrance hole 1-2 is precisely machined using a general-purpose hollow hide to produce a semi-finished product.

Next, as shown in Figure Cb1, the above semi-finished product is inverted and the injection hole 1-2 is fitted into the special jig 13 attached to the chuck (not shown), with the mounting surface 1-1 in contact with the Attach and process the outer bag finish and end surface]-3, then each fin part 2
Machining the tapered part 1-4 that connects the tips of. And the fourth
As shown in figure (a), the cutting edge 1 has the same shape as the groove 1-5.
2-1, the tip in the direction of arrow A is smaller than the inner diameter of the innermost tapered part, and the neck part 12-2 is long. 12-1 (move along the trajectory of ■ to ■ shown in Figure b1), and move the entrance taper part 1-6 and each groove part 1- as shown in Figure +b1 of Figure 2.
5, and an integrated corrugated horn having a plurality of fins 2 forming the emission part 1-7 is completed using a normal lathe or an NC lathe.

In addition, as shown in Fig. 3, another method for manufacturing a corrugated horn divided into three parts is to use hard copper or red copper round rods as shown in Fig. 2.
The outline of the outer bag, the mounting surface 1-1, and the outer periphery of its flange were processed using the method shown in the figure, and then the outer bag was finished and the end surface 1-3 was processed using the method shown in Fig. ib1 of Fig. 2. After that, use a general-purpose boring tool to drill the entrance hole 1-2 and the entrance taper part 1-6.
and a main body 1° in which the fitting taper part 1-8 is precisely machined, and the fitting taper part 1 is made from a round bar made of the same material as the main body 1'.
-8, and drilling and finishing of the pilot hole of the taper part 1-4, and using a dedicated boring tool 12 shown in FIG. 4, the groove part 1-5. Entrance side fin 1 metal fitting 2-1° forming fin part 2 and output part 1-7
and the outlet side finned metal fitting 2-2'' are manufactured using a normal lathe or an NC lathe, and the finned metal fitting 2-1'' is made on the side of the fitting taper part 1-8 in the direction of the manual force indicated by the arrow, and the finned metal fitting 2-1'' is made on the end surface 1-3. Completed by press-fitting metal fittings 2-2 with fins on the sides.

[Problem that the invention seeks to solve]

The problem with the conventional manufacturing method of corrugated horns as explained above is that the tip in the direction of arrow A is smaller than the inner diameter of the innermost taper part in the deep inlet taper part and each groove part. Since a long dedicated boring tool is required, during machining, sticky cutting chips may be drawn in, and cutting resistance applied to the entire cutting edge may cause the cutting edge to escape.
The vibration of the neck deteriorates the dimensional accuracy of the inner diameter and groove width at the back of the groove, and the vibration and cutting debris generate a wave pattern on the surface, making it impossible to obtain the necessary surface roughness.

In addition, in the method of manufacturing a corrugated horn by dividing as shown in Fig. 3, when machining the grooves of the inlet side fin fitting and the outlet side fin fitting, cutting waste and cutting resistance cause the inner diameter of the deep part of the groove to be damaged. The dimensional accuracy of the width deteriorates, and a wave pattern is generated on the surface due to the vibration and cutting debris.

Furthermore, since the outer diameter of the abutting surface is tapered by manufacturing each separately, the outer diameter of the abutting part and the outer diameter of the inlet side finned metal fitting that comes into contact with the inner diameter of the bottom in the direction of arrow A of the fitted taper part. If the outer diameter of the abutting part of the inlet side finned metal fitting is smaller than the inner diameter of the bottom of the fitting taper part, it will hit the bottom and the taper will lose its tightness; It has the disadvantage of creating a gap at the joint.

Similarly, a similar problem occurs at the abutting portion of the finned fitting on the inlet side and the finned fitting on the outlet side, making it impossible to obtain dimensional accuracy after press-fitting, which causes deterioration of electrical characteristics.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention aims to provide a method for manufacturing a corrugated horn that can be easily and inexpensively manufactured with high precision.

[Means for solving problems]

The above problem can be solved by machining the outer bag, the mounting surface 1-1, and the outer periphery of the flange from a hard copper or red copper round bar, as shown in Figure 1, and then using a lower part smaller than the entrance hole 1-2. After inverting the object with the hole penetrated and finishing the outer bag and processing the end surface 1-3 using the outer circumference of the flange on the mounting surface 1-1 as a reference, use a general-purpose boring tool to drill the entrance hole L-2 and the entrance taper. Part 1-6 Main body 1 in which parallel stepped cylindrical holes into which the fin rings 2 to 1 to 2-5 and the presser ring 3 are fitted are sequentially precisely machined, and the fin part with different inner diameter dimensions of the tapered part 1-4 2 and the groove portion 1-5 in the opposite direction of the arrow A forming the ring are integrated into a cylindrical finned ring 2-1 to 2-5 with parallel outer periphery;
This problem is solved by a corrugated bone manufacturing method in which a presser ring 3 having a tapered inner diameter and a cylindrical outer circumference is combined, and each is sequentially inserted and then welded by welding or the like.

C action] That is, in the present invention, the main body 1 with the mounting surface 1-1 and the outer periphery of its flange processed is inverted, and the entrance holes 1-2. Incident tapered portion 1-6 and finned rings 2-1 to 2-5. By machining the parallel stepped cylindrical holes into which the presser ring 3 is fitted, in one setting, each center, inner diameter dimension and step length can be made with high precision, and the outer circumference can be parallel to each other. Rings with fins 2-1 to 2-5. By separately manufacturing each of the holding ring 3 and the holding ring 3, it is possible to use a boring tool with a short neck and high rigidity, which eliminates the entrainment of cutting chips during machining, and reduces cutting resistance by cutting with a part of the cutting edge. This eliminates cutting edge relief and vibration, and provides dimensional accuracy of the inner diameter and groove width at the back of the groove, as well as highly accurate surface roughness.The outer diameter is also cylindrical, so it can be easily measured and processed with high precision. , and the length in the central axis direction can be finished to micron level precision by surface polishing.

In the stepped cylindrical hole of the main body 1, which has been machined with high precision as described above, rings 2-1 with fins, which are also machined with high precision, are
By aligning 2-5 and the retaining ring 3 and welding the retaining ring 3 to the case 1 by electron beam welding, there is no gap between the abutting parts, and the accuracy after assembly is also increased, reducing the thickness of the case 1. It is possible to reduce the

〔Example〕

The present invention will be described in detail below based on embodiments shown in the drawings.

As shown in FIG. 1, which is a cross-sectional view illustrating a method for manufacturing a corrugated horn according to an embodiment of the present invention, a main body 1 is made of metal used for the corrugated horn 1, such as round bar material such as copper or red copper, using a general-purpose lathe. The outer bag, the mounting surface 1-1 and the outer periphery of the flange thereof are processed, and the entrance hole 1-1 is gripped and rotated.
2 is passed through, and the mounting surface 1-
1 is pressed and fixed, and after finishing the outer bag and processing the end face 1-3, use a general-purpose boring tool (not shown) to make an entrance hole 1-2 on the entrance side in the direction of arrow A. Incidence taper section 1-6. and its extension is processed into a conical taper shape to form finned rings 2-1 to 2-5 on the exit side. Then, parallel cylindrical holes of predetermined dimensions into which the presser ring 3 is fitted are precisely machined in a stepwise manner.

The finned rings 2-1 to 2-5 are made of the same material as the main body 1. For example, metal round rods made of copper, red copper, etc. are mounted on an NC lathe, and a general-purpose boring tool is used to create rings with different inner diameters. Machining the fin part 2 and the groove part 1-5 next to it in the opposite direction of the arrow, and finishing it with a parallel circumference whose outer diameter matches the inner diameter at the position where it is inserted into the stepped cylindrical hole of the main body 1, Both end faces are cut to a size including the fin part 2 and the adjacent groove part 1-5, and both end faces are finished by surface polishing.

The presser ring 3 is finished so that its inner diameter matches the taper of the emitting portion 1-7 and its outer diameter matches the cylindrical hole formed from the end face 1-3 of the main body 1, and is similarly machined to a predetermined length by surface polishing.

To construct the corrugated horn, insert the finned rings 2-1 to 2-5 into the stepped cylindrical hole of the main body 1 in order of decreasing inner diameter of the tapered portion 1-4, and finally insert the retaining ring 3. The circumference of the end face of the end face ring 3 of the main body 1 is welded using an electron beam welding machine, thereby manufacturing a corrugated horn with high dimensional accuracy and high performance.

The present invention includes laser welding, which is limited to the above-mentioned embodiments, and individual welding by electronic means, brazing, or soldering, and also includes an 11 rvl conical shape.

〔Effect of the invention〕

As explained above, according to the present invention, significant performance effects can be expected such as the production of high-performance corrugated horns with high dimensional accuracy and dense surface roughness using an extremely easy manufacturing method. It is extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a method for manufacturing a corrugated horn according to an embodiment of the present invention, FIG. 2 is a diagram for explaining a conventional method for manufacturing a corrugated horn, and FIG. 3 is a diagram for explaining another conventional manufacturing method. FIG. 4 is a plan view of a boring tool used in the production of conventional corrugated horns. In the figure, 1 is the main body, 1-1 is the mounting surface, 1-2 is the entrance hole, 1-3 is the end surface, 1-4 is the tapered part, 1-5 is the groove,
1-6 is an entrance taper part, 1-7 is an output part, 2 is a fin part, 2-1 to 2-5 are rings with fins, and 3 is a holding ring. Figures (a) (b) Erase the end of Goldeni U in the table; Uami n1) Figure 2: 5! -fhτt,
Figure 3 ((1) (b><;l-*me]leγ' NEET ice-n Meika fatakawa power 8°ite 1st Figure 4)

Claims (1)

[Claims] The inner surface of the main body (1) includes individual finned rings (2-1 to 2-1).
2-n) into which the parallel inner circumferential surface is fitted is formed into a conical step shape, and the large diameter inner circumferential surface and outer surface are parallel outer circumferential surfaces with a fin portion protruding in the inner diameter direction at one end and a groove portion at the other end. Naru fin ring (
2-1 to 2-n) are sequentially fitted into the inner surface of the main body (1) in a stepwise manner from the small diameter side to the large diameter side.