Stacked conduit assembly and screw fastening method for conduit part

Abstract

A stacked conduit assembly comprises: a conduit part 10 in which a plurality of plate-like parts 1 to 7 are stacked and integrated, and a hollow conduit is formed in an inner layer; and a control board 20 to be fastened to the conduit part 10 by a screw. The plate-like parts includes a plurality of plate-like parts that respectively form a side wall, an upper face, and a bottom face of the conduit, a pilot hole 2b is formed in a plate-like part 2 that forms the side wall of the conduit, and the screw is a tapping screw 40 that taps by itself in the pilot hole and is fastened. Thus, a stacked conduit assembly that can stabilize a screw engagement state and realize downsizing (thinning) of devices and cost reduction can be obtained.

Description

technical field [0001] The present invention relates to a laminated piping assembly in which a plurality of sheet-shaped parts are laminated and integrated, and a piping part forming a hollow piping is connected to a connected part such as a control board. In addition, it relates to a screw connection method of piping parts in which a connected part is connected to the piping parts with screws. Background technique [0002] In the waveguide path parts or waveguide structure antennas used in microwave or millimeter wave radar or communication equipment, it is required to have a complex multi-layer structure of hollow pipelines, especially for civilian equipment such as vehicle radar, which must be done to miniaturization and high productivity. For this reason, as a form of piping parts in which a hollow waveguide (pipe) is formed, a plurality of sheet-shaped parts formed with punched holes of various shapes are laminated and integrated by methods such as surface bonding. Co...

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Problems solved by technology

[0006] However, in the method of forming screw holes by machining after the above-mentioned pipe parts are integrated, the cutting oil used in the screw hole processing and the cleaning fluid for removing the cutting oil flow into the pipe parts of the parts and cannot be fixed. The problem of removal is that in the case of small equipment, it is difficult to realize the avoidance area of ​​the drill tip in the bottom hole processing of the screw due to the arrangement where the position of the screw hole overlaps with the position of the inner layer pipe. The problem of thinning

[0007] As for the method of pre-processing a screw hole on a pipeline part and then integrating it, the simplest configuration to make the shape of the part is to separate the side wall of the pipeline from the top and bottom parts. However, since the thickness of each part is limited below the height of the pipeline in this case, it is difficult to obtain the necessary screw engagement length (usually more than three pitches of the thread teeth are required)

[0008] On the other hand, in the method described in Patent Document 1, the processing steps are increased and the cost is increased when forming the disk-shaped constriction, and the formation of the disk-shaped constriction is not conducive to thinning, so it is not an effective improvement method.

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