| 摘要 |
A three-dimensional simple flexible mould for bending pipes comprised of a plurality of arciform or half-circled spring elements, pins and chucking rings for being a protecting mould in a three-dimensional pipe bending process. The two ends of every spring element have two lapping portions each with a hole for insertion of two common pins therethrough. One of the lapping portions on each of the spring elements is lapped over one of the lapping portions of the neighbored one of the spring elements at one side of the spring element and the other over another of the lapping portions of another neighbored one of the spring elements at the other side thereof. Such that said spring elements are strung to be in the form of a spiral spring typed flexible mould. The pins are provided on the two open ends thereof with annular grooves for engagement by the chucking rings to prevent the spring elements from dropping. Thereby, a straight pipe to be bent can be placed for being processed by a three-dimensional pipe bending process with a manual pipe bending machine or some other pipe bending equipment. This can increase the bending strength of the pipe under bending moment. The spring elements can scatter the stress in bending. The bending process is simple and can improve the technique of processing in making artificial pipes.
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