Numerical-control mechanical corrugation expansion machine and corrugated pipe forming method thereof

Abstract

The invention discloses a numerical-control mechanical corrugation expansion machine and a corrugated pipe forming method thereof. The numerical-control mechanical corrugation expansion machine is provided with a die sheet forming mechanism, a power mechanism, a control system and the like. The die sheet forming mechanism comprises a round expansion inner die plate arranged transversely and composed of a plurality of fan-shaped die sheet units. A pipe blank to be machined is arranged on the periphery of the expansion inner die plate in a sleeving mode. A vertical conical loading pressure head is arranged on the central line of the expansion inner die plate, moves upwards or downwards under the effect of the power mechanism and extrudes the die sheet units out through the inclined surface, so that a corrugation shape of the pipe blank arranged on the periphery of the expansion inner die plate in the sleeving mode is formed in an extruding and expansion mode; meanwhile, the die sheets rotate for carrying out extruding and expansion many times so that defects of the corrugation shape can be corrected and corrugated pipes with regular corrugation shapes and high quality can be manufactured. The numerical-control mechanical corrugation expansion machine and the corrugated pipe forming method thereof have the advantages that the structure is simple, the machining and manufacturing cost is low and installation and use are convenient.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to bellows processing equipment and a forming method for manufacturing the bellows. Background technique [0002] The bellows is the main component of the expansion joint, and the expansion joint is a special licensed equipment. The enterprise that produces the expansion joint must obtain the special equipment manufacturing license of the People's Republic of China (pressure pipeline components), and the bellows of the specification must be hydraulic. More than 100% of the enterprises adopt the hydraulic method; the bellows that are not under pressure generally adopt the rolling method. Forming corrugated pipes by means of expansion has just begun in China. [0003] In foreign countries, expansion joint companies generally adopt expansion methods, including mechanical expansion and numerically controlled electromechanical integration expansion, but no matter which expansion mod...

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Problems solved by technology

[0003] In foreign countries, expansion joint companies generally use expansion methods, including mechanical expansion and numerically controlled electromechanical integration expansion, but no matter which expansion mode, the equipment is generally more complicated

[0004] The hydraulic method generally adopts outer diameter positioning, and different inner diameters are obtained with different wall thicknesses of bellows, so that the matching gap between it and the connecting pipe is large or small. Sometimes the connecting pipe needs to be processed to complete the fit, so that the overlapping The quality of welding bead (critical welding bead) cannot be guaranteed

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