Manufacturing apparatus and method of spiral duct including elbow

摘要

Provided is a manufacturing method of a spiral duct including an elbow. The manufacturing method includes: bending projecting wave portions of metal plate members upward by a ball caster, the metal plate members being cut in such a manner that a straight lines and waves are formed; transferring the metal plate members using a pair of transfer rollers which are rotated by a first motor installed in a manufacturing apparatus of a spiral duct including an elbow; pressing a single folded portion and a double folded portion of the metal plate members using upper and lower pressing rollers while the transferred metal plate members are rolled into a circular shape by a joint jig; and cutting the elbow formed by the manufacturing apparatus using upper and lower cutters. According to the invention, an elbow curved at a gentle angle can be formed, and the projecting wave portions of the metal plate members are bent so as to form the elbow. Therefore, a fluid can smoothly flow along the curved portion of the elbow. Further, as the elbow is formed by consecutive processes, it is possible to increase productivity.

主权项

1. A manufacturing apparatus of a spiral duct including an elbow, comprising:
a wave bending unit that upwardly bends projecting wave portions metal plate members supplied in a state where the metal plate members are cut in such a manner that a straight line and waves are formed, the straight line having a double folded portion, and the respective waves having a single folded portion; a transfer unit that transfers the metal plate members having the bent wave portions; and a forming and cutting unit that forms the metal plate members transferred from the transfer unit into a cylindrical spiral shape, presses the metal plate members to form an elbow, and then cuts the metal plate members, wherein the forming and cutting unit includes: a lower pressing roller that is installed so as to be rotated by power received from a driving motor; an upper pressing roller that is installed above the lower pressing roller so as to press the bent metal plate members; a fixing device that is installed above the upper pressing roller and has a joint jig fixed thereto, the joint jig forming the metal plate members transferred from the transfer unit into a cylindrical shape; a cutter that is composed of upper and lower cutters which are installed on front surfaces of the upper and lower pressing rollers, respectively, so as to cut the metal plate members formed into a cylindrical shape by the joint jig; and a rotating device that rotates the cutter about an axis which is parallel to axes of the upper and lower pressing rollers using a driving force of a servo motor, wherein the joint jig includes: a plurality of divided pieces that are divided in a circular arc shape; a plurality of self-aligning bearings that are coupled to the respective divided pieces such that the divided pieces freely move without interfering with the advancing direction of an elbow formed by the joint jig, wherein the divided pieces of the joint jig have a moving plate which is bent toward one surface and inner curve of the divided pieces so as to guide a metal plate members entering the joint jig in a state where the entered metal plate members are held.