Helical bracket manufacturing method

Abstract

The invention relates to a method for producing screw support and relative screw support, which can avoid central deflection of covered layer, and set the right position of cross mould relative to the phase of long screw. The inventive method comprises: feeding metal core wire (2) into the mould (8) whose front part is the long screw hole (82) through with metal core wire (2) and the back part isthe long screw large hole (83) larger than the small hole (82); the metal core wire (2) of front part is bended into the long screw; and the back part is covered with macromolecule material.

Description

technical field [0001] The present invention relates to a helical support for supporting insulated and covered electric wires and a manufacturing method thereof. Background technique [0002] In the conventional helical stent, first, the metal core wire is bent into a long helical shape by using a die provided with a long helical hole, and then the long helical metal core wire is introduced into a crosshead die of an extruder, and the entire surface of the metal core wire is Apply an insulating covering layer composed of a polymer material, and then cut the long spiral insulating covered wire into a predetermined length, and form a spiral stent with a predetermined shape such as a U shape in the middle part (refer to Patent Document 1-Japan JP-A-55-53114 Gazette). [0003] However, when the above-mentioned conventional method is used, the center of the covering layer may be shifted when forming a long spiral insulated covered wire. That is, the crosshead die of the extrude...

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Problems solved by technology

[0003] However, when using the above-mentioned conventional method, the center of the covering layer may be shifted when forming a long spiral insulated covered wire.

That is, the crosshead die of the extruder is set at a specific phase position of the long helical metal core wire discharged from the long spiral forming die, and the coating layer is formed at the specific phase position, although when the position of the crosshead die is relatively long helical When the position of the coating is not correct, the center of the coating layer will deviate, but the phase of the long helix and the mutual position of the crosshead die may also deviate due to other reasons such as vibration during the forming process of the coating wire, so the coating layer may be formed. The center deviates from the product, or the problem of partial center deviation

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