JP2014078897A - Rectangular waveguide - Google Patents

Abstract

In bending a hollow shape member, cracks on the outer periphery of the bending and wrinkles on the inner periphery of the bending are suppressed without impairing the efficiency with which radio waves are transmitted through the rectangular waveguide.
A cross section having a first side surface, a second side surface, a third side surface, and a fourth side surface, wherein the first side surface and the third side surface facing each other are curved with the outer peripheral side and the inner peripheral side, respectively. A rectangular metal pipe, a first flange fixed to one end of the metal pipe and provided with a first rectangular opening, and fixed to the other end of the metal pipe and provided with a second rectangular opening. A rectangular waveguide comprising a second flange. The plate thickness of the first side surface and the third side surface is thicker than the plate thickness of the second side surface and the fourth side surface.
[Selection] Figure 3

Description

  The present invention relates to a rectangular waveguide, and more particularly, to bending of a metal hollow shape constituting the rectangular waveguide.

  In an artificial satellite, many rectangular waveguides are used as a path for transmitting radio waves between communication devices. This rectangular waveguide is composed of a rectangular metal pipe (hollow shape member) for propagating radio waves and a flange for connecting the rectangular waveguide. Usually, a plurality of rectangular waveguides are used to connect communication devices. According to the standard of artificial satellites, rectangular waveguides of several tens to over 1,000 are used for one artificial satellite. The material of the rectangular waveguide is mainly a lightweight aluminum alloy, but the mass of the rectangular waveguide may occupy 5% or more of the mass of the artificial satellite. The weight reduction of the rectangular waveguide leads to the weight reduction of the artificial satellite.

  Use of a thin hollow material for the rectangular waveguide is effective for reducing the weight of the satellite. The rectangular waveguide is bent at an arbitrary angle in order to secure a path for connecting communication equipment. In order to transmit radio waves efficiently, the vertical and horizontal dimensions of the rectangular waveguide are important, and it is necessary to avoid extremely large changes in the vertical and horizontal dimensions. In the bent portion, it is required to suppress the occurrence of cracks on the outer periphery side of the bend and wrinkles on the inner periphery side of the bend. Examples of the processing method for bending the hollow shape include methods such as press bending, pressing bending, drawing bending, and tensile bending. In each method, in order to suppress the occurrence of cracks and wrinkles in the bent portion, devices such as restraints and mold shapes are applied, and higher-quality bending is proposed.

  On the other hand, in recent years, the trend of reducing the bending radius in bending work is progressing along with the thinning of the hollow shape material in order to reduce the weight and size. Due to such a tendency, the aforementioned phenomena such as extreme changes in vertical and horizontal dimensions, cracking on the outer periphery of the bending, and generation of wrinkles on the inner periphery of the bending are likely to occur in the bending of the hollow shape member. In other words, when bending is performed by the conventional bending method due to thinning and reduction of the bending radius, phenomena such as cracks and wrinkles occur in the hollow shape material.

  There is an urgent need to propose and develop methods to prevent and control these phenomena. For example, in Patent Document 1, as a method of avoiding extremely large changes in vertical and horizontal dimensions and suppressing the generation of cracks on the outer periphery of the bend or wrinkles on the inner periphery of the bend, the portion that becomes the outer side of the bend protrudes toward the outer side of the bend We have proposed a hollow shape that has an arc shape.

Japanese Patent Laid-Open No. 2002-225651

Phenomenon that cracks occur on the outer periphery of the bending or wrinkles occur on the inner periphery of the bending when bending the hollow profile with a reduced thickness by the bending method described in the background art Occurs. As a reinforcing method, methods have been devised in which a hollow shaped tube is filled with an object such as resin, sand, or ice, or a metal mandrel is inserted. A hollow profile that has a sufficient thickness is less likely to crack or wrinkle, whereas a material that has been thinned to reduce weight is likely to crack and wrinkle even at the same bending radius. . Further, if the bending radius is reduced for miniaturization, cracks and wrinkles are likely to occur even if the wall thickness is the same. In other words, it has become a state where satisfactory bending cannot be performed sufficiently only by improving the processing conditions in the conventional manufacturing methods for bending.

  Therefore, proposals have been made to solve the above-described problems for materials to be bent. As in Patent Document 1, it is possible to suppress cracks on the outer side of the bend, particularly by using a hollow shape having an arcuate shape in which a portion on the outer side of the bend protrudes toward the outer side of the bend. Alternatively, a means for reinforcing the inner hollow portion of the hollow shape member by providing a rib has been proposed. Since the hollow shape member has a cross-sectional shape of a substantially daily shape, a substantially square shape, and a substantially square shape, an effect of particularly suppressing changes in the vertical and horizontal dimensions can be obtained.

  However, in these techniques, by providing means for solving the problems, there arises a new problem that the cross-sectional area becomes larger and the weight increases compared to the previous shape. Furthermore, in a hollow shape material such as a rectangular waveguide, in order to efficiently transmit radio waves, the vertical and horizontal dimensions in the tube and the cross-sectional shape of the tube inner mouth shape cannot be changed. Further, it is not possible to provide an overhang in an arc shape, or to provide ribs such as an approximate day shape, an approximate eye shape, and an approximate field shape.

  The rectangular waveguide according to the present invention has a first side surface, a second side surface, a third side surface, and a fourth side surface, and is curved with the first side surface and the third side surface facing each other as the outer peripheral side and the inner peripheral side, respectively. A metal pipe having a rectangular cross section, a first flange fixed to one end of the metal pipe and provided with a first rectangular opening, and a second rectangular opening fixed to the other end of the metal pipe And a second flange provided. The plate thickness of the first side surface and the third side surface is thicker than the plate thickness of the second side surface and the fourth side surface.

  According to the present invention, in bending of a hollow shape member, it is possible to suppress generation of cracks on the outer periphery of the bending and wrinkles on the inner periphery of the bending without impairing the performance (efficiency) of transmitting radio waves in the rectangular waveguide. Will be able to.

1 is a schematic perspective view showing a rectangular waveguide according to a first embodiment. 1 is an overview perspective view showing a rectangular metal pipe according to Embodiment 1. FIG. 4 is a cross-sectional view showing a rectangular metal pipe according to Embodiment 1. FIG. FIG. 6 is a cross-sectional view showing a form of a rectangular metal pipe according to Embodiment 2. It is sectional drawing which shows another form of the rectangular metal pipe which concerns on Embodiment 2. FIG. FIG. 10 is a schematic perspective view showing a rectangular waveguide according to a third embodiment. 6 is a cross-sectional view showing a rectangular metal pipe according to Embodiment 3. FIG. It is sectional drawing which shows another form of the rectangular metal pipe which concerns on Embodiment 4. FIG. It is sectional drawing which shows another form of the rectangular metal pipe which concerns on Embodiment 4. FIG.

  Embodiments of a rectangular waveguide according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably.

Embodiment 1 FIG.
FIG. 1 is a schematic perspective view showing a rectangular (rectangular) waveguide according to Embodiment 1 of the present invention. The rectangular waveguide 100 includes a rectangular metal pipe (hollow shape member) 1, a first flange 12 and a second flange 13. The radio wave enters from the first flange 12 provided with the rectangular opening 12a and exits from the second flange 13 provided with the rectangular opening 13a. The rectangular metal pipe 1 is formed by extrusion or drawing using mainly aluminum or aluminum alloy. Aluminum or aluminum alloy is usually fully annealed at around 400 ° C. in order to improve elongation performance. The thickness of the metal rectangular metal pipe 1 is about 0.3 to 1.0 mm and is not particularly limited. As the aperture size, those having a side of 10 to 70 mm are mainly used. The rectangular metal pipe 1 is bent and curved.

  FIG. 2 is a schematic perspective view showing a rectangular metal pipe according to Embodiment 1 of the present invention. The rectangular metal pipe 1 includes an outer peripheral surface 2, an upper surface 4, an inner peripheral surface 3, and a lower surface 5, and is in a straight pipe state before bending. When performing the bending process, the outer peripheral surface is the outer peripheral surface 2, the inner peripheral surface is the inner peripheral surface 3, and the surfaces that are orthogonal to each other and are not subjected to the bending process are the upper surface 4 and the lower surface 5. The upper surface 4 and the lower surface 5 are restrained from bulging to the outside of the pipe during molding due to restraints in the bending equipment. Further, by inserting a rigid mandrel as a filler (sand, iron ball, ice, resin, etc.) or a cored bar into the pipe, it is possible to prevent all side surfaces from falling into the pipe.

  FIG. 3 is a cross-sectional view of the rectangular metal pipe according to Embodiment 1 of the present invention. The outer peripheral surface 2 and the inner peripheral surface 3 to be bent are made thicker, and the upper surface 4 and the lower surface 5 are made thinner. By thickening the outer peripheral surface 2 to which tensile stress is applied and the inner peripheral surface 3 to which compressive stress is applied by bending, cracking of the outer peripheral surface 2 and wrinkles of the inner peripheral surface 3 are suppressed. On the other hand, the upper surface 4 and the lower surface 5 that are not subjected to extremely large tensile stress and compressive stress by bending can achieve the goal of reducing the weight and reducing the weight by reducing the thickness. When bending is performed assuming that all four side surfaces arranged in a rectangle have the same wall thickness, the thinner the wall thickness or the smaller the bending radius R, the closer to the outer peripheral surface 2. Cracks tend to occur on the inner peripheral surface 3.

  As a means for suppressing the occurrence of cracks on the outer peripheral side and wrinkles on the inner peripheral side, a method of providing reinforcing ribs such as a substantially daily shape, a substantially square shape, and a substantially square shape inside the rectangular metal pipe is used. In a rectangular waveguide for an artificial satellite, it is impossible to change the inner shape and dimensions of a rectangular metal pipe in order to efficiently transmit radio waves in the tube. According to the present invention, since it is not necessary to change the inner shape and dimensions of the rectangular metal pipe, it is possible to suppress cracking of the bent outer peripheral surface and wrinkles of the inner peripheral surface without impairing the radio wave transmission performance.

Embodiment 2. FIG.
4 and 5 are sectional views of a rectangular metal pipe according to Embodiment 2 of the present invention. In order to perform good bending, the outer peripheral surface 2 and the inner peripheral surface 3 do not necessarily have the same thickness. FIG. 4 shows that the thickness of the outer peripheral surface 2 is larger than the thickness of the inner peripheral surface 3. FIG. 5 shows that the thickness of the outer peripheral surface 2 is thinner than the thickness of the inner peripheral surface 3. Depending on the bore size, either the bending outer peripheral surface crack or the inner peripheral surface wrinkle may occur remarkably. In the range where the cross-sectional area does not increase, the thickness of the outer peripheral surface, the inner peripheral surface, the upper surface, and the lower surface may be appropriately selected according to various conditions related to bending.

Embodiment 3 FIG.
FIG. 6 is a schematic perspective view showing a rectangular waveguide according to Embodiment 3 of the present invention. In the third embodiment, ribs 11 are provided on the outside of the outer peripheral surface 7 and inner peripheral surface 8 of the rectangular metal pipe 6. The rib 11 extends in the longitudinal direction of the rectangular metal pipe 6. The rectangular metal pipe 6 is mainly made of aluminum or an aluminum alloy. Because of the excellent elongation performance of the material, complete annealing is usually performed at around 400 ° C. The wall thickness is about 0.3 to 1.0 mm and is not particularly limited, but the diameter is mainly in the range of 10 to 70 mm on a side. As in the first and second embodiments, out of the side surfaces to be bent, the outer peripheral surface is the outer peripheral surface 7 and the inner peripheral surface is the inner peripheral surface 8. The surfaces that are not provided are the upper surface 9 and the lower surface 10.

  FIG. 7 shows a sectional view of a rectangular metal pipe for bending according to Embodiment 3 of the present invention. The rectangular metal pipe is mainly formed by extrusion and drawing. In the first embodiment, as described above, when bending is performed, the upper surface 9 and the lower surface 10 are prevented from expanding to the outside of the pipe due to the restraint in the bending processing facility. By inserting a solid mandrel as a filler, such as sand, iron ball, ice, or resin, into the inside of the tube, all sides are prevented from falling into the inside of the tube. As for the outer peripheral surface and the inner peripheral surface, if bending is performed assuming that all four side surfaces have the same thickness, the thinner the wall thickness is, or the smaller the bending R is. As the amount increases, cracks occur on the outer peripheral surface 7 and wrinkles occur on the inner peripheral surface 8.

  In the first embodiment, the outer peripheral surface 2 and the inner peripheral surface 3 to be bent are made thicker, and the upper surface 4 and the lower surface 5 are thinned on the contrary, while in the third embodiment, The ribs 11 are provided on the outer sides of the outer peripheral surface 7 and the inner peripheral surface 8. By this rib 11, the cross-sectional rigidity of the outer peripheral surface 7 and the inner peripheral surface 8 can be increased, and cracks on the outer peripheral surface and wrinkles on the inner peripheral surface can be suppressed. Similar to the first embodiment, the upper surface 9 and the lower surface 10 are thinned to such an extent that the total cross-sectional area does not increase, so that the weight does not increase and the purpose of reducing the weight can be achieved. is there. Similar to the first and second embodiments, it is not necessary to change the inner shape and dimensions of the rectangular metal pipe, so that it is possible to suppress bending outer peripheral surface cracks and inner peripheral surface wrinkles without impairing radio wave transmission performance. It becomes possible, and a favorable bending process can be performed.

Embodiment 4 FIG.
8 and 9 are sectional views of a rectangular metal pipe according to Embodiment 4 of the present invention. In order to perform a favorable bending process, it is not necessary to provide ribs on both sides of the outer peripheral surface 7 and the inner peripheral surface 8. FIG. 8 shows that the rib 11 is provided on the outer peripheral surface 7 and no rib is provided on the inner peripheral surface 8. FIG. 9 shows that the outer peripheral surface 7 is not provided with ribs, but the inner peripheral surface 8 is provided with ribs 11. Depending on the bore size, either the bending outer peripheral surface crack or the inner peripheral surface wrinkle may occur remarkably. As long as the cross-sectional area does not increase, only one of the ribs provided on the outer peripheral surface or the inner peripheral surface may be provided, and the size of the rib may be appropriately selected according to various conditions related to bending.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  The rectangular metal pipe according to the present invention is used as an automobile frame and other structural members in addition to a rectangular waveguide for an artificial satellite.

  1 rectangular metal pipe, 2 outer peripheral surface, 3 inner peripheral surface, 4 upper surface, 5 lower surface, 6 rectangular metal pipe, 7 outer peripheral surface, 8 inner peripheral surface, 9 upper surface, 10 lower surface, 11 rib, 12 first flange, 13 first 2 flange, 100 rectangular waveguide

Claims (4)

It has a first side surface, a second side surface, a third side surface, and a fourth side surface, and is curved with the first side surface and the third side surface facing each other facing the outer peripheral side and the inner peripheral side, respectively, and the cross section is rectangular A metal pipe, and a first flange fixed to one end of the metal pipe and provided with a first rectangular opening,
A second flange fixed to the other end of the metal pipe and provided with a second rectangular opening;
The rectangular waveguide characterized in that the plate thickness of the first side surface and the third side surface is thicker than the plate thickness of the second side surface and the fourth side surface.   The rectangular waveguide according to claim 1, wherein the plate thickness of the first side surface is thicker than the plate thickness of the third side surface.   The rectangular waveguide according to claim 1, wherein the plate thickness of the first side surface is thinner than the plate thickness of the third side surface.   The rectangular waveguide according to any one of claims 1 to 3, wherein a rib extending in a longitudinal direction of the metal pipe is formed outside the tube on the first side surface or the third side surface. .

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