| 摘要 |
A double layer elbow production apparatus according to the invention is characterized by comprising: a main body having a receptacle defined therein; a pressing guide, which is disposed inside the receptacle of the main body and has a plurality of pressure pieces arranged along a circumference direction, the pressure pieces being formed in a way to make a synchronized sliding movement with neighbouring pressure pieces, respectively, so as to approach one another in a radiation direction; a plurality of springs, which is installed between the pressure pieces of the pressing guide to provide the elastic force in a direction in which the pressure pieces move away from one another; a split mould, which has a plurality of mould elements, each being disposed on a radially outer side of a respective one of the pressure pieces of the pressing guide, inner circumferential surfaces of the mould elements forming the peripheral geometry of an elbow tube bent on a curved path as the pressure pieces of the pressing guide move forwards in the radial direction to bring the mould elements into contact with one another; and a cylinder, which is installed inside the receptacle of the main body and has a cylinder rod for applying an external force to at least one of the pressure pieces of the pressing guide by making a forward/backward movement with respect to the pressing guide. Further, the double layer elbow production method according to the invention is characterized by comprising the steps of: inserting into an outer elbow tube an inner elbow tube made out of heat-treated, wear-resistant steel; and pressurizing the outer elbow tube being bent on a curved path by a plurality of mould elements arranged along a circumference direction so as to adhere the inner circumferential surface of the outer elbow tube onto the outer circumferential surface of the inner elbow tube.
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