Spinning part support type corrugated pipe spinning equipment and forming method

Abstract

The invention discloses spinning part support type corrugated pipe spinning equipment which comprises a mandrel (2) connected onto a spinning machine spindle (1), wherein a press block (6) is arranged on a large-diameter section (3) of the mandrel (2); a small-diameter section (4) of the mandrel (2) is sleeved with a corrugated die (5); the press block (6) is tightly pressed on the outer surface of the corrugated die (5); a locking nut (7) at the tail end of the mandrel (2) is used for fixing the corrugated die (5); and the tail end of the mandrel (2) is tightly pressed and supported by a spring guide (9). The invention further discloses a corrugated pipe forming method adopting the equipment. The spinning part support type corrugated pipe spinning equipment and the corrugated pipe forming method adopting the equipment have the benefits as follows: the equipment is simple in structure and reasonable in design, the corrugation processing accuracy is high, the deformation defect of a pipe during the forming process is effectively prevented, and accordingly, the forming quality is improved; the corrugated die is suitable for processing pipes with different lengths, further, the dismounting is convenient, and the structure is firm; and besides, the circumferential weld of a product is reduced, the product quality is good, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of metal pipe processing, in particular to a spinning part-supported bellows spinning equipment and a forming method. Background technique [0002] The forming process of bellows includes hydroforming, roll forming and welding forming. Hydroforming is the most commonly used forming method for bellows. Using the liquid pressure in the tube blank, the tube blank is bulged in the confining ring until yielding occurs along the ring direction, and then the tube blank is compressed to the required length and small diameter. Bellows mostly use this method. The rolling forming process is mainly used to process large bellows, which relies on the rolling forming of the forming wheel in the tube blank, which can be formed by single wave rolling, and some devices can also form several corrugated mechanical bulging bellows at a time. The mold that expands inside the tube blank is used to expand and press into corrugati...

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Problems solved by technology

[0004] The traditional manufacturing method of "plate beading-rolling-welding" mainly has the following disadvantages: (1) The welding area is prone to stress concentration, which reduces the fatigue strength of the product, and the weld area may produce microbeads during long-term storage. (2) The large number of longitudinal welds and circumferential welds, especially cross welds, makes it difficult to guarantee the welding quality of the tunnel pipe. According to the design requirements, the weld quality of the product 100% inspection is required, the efficiency of weld inspection is low and the cost is high; (3) due to the limitations of the process itself, the length of each section is relatively short, currently it is mainly within 1100mm, which makes the number of sections of the tunnel pipe more difficult to process The process is complicated and the production efficiency is low; (4) The product deformation is large during the welding process, and the product forming accuracy and consistency are poor

Using the above-mentioned equipment to process corrugated pipes with a pipe diameter greater than 250mm and a pipe wall thickness of 2.7-3.5mm, there are always deformation defects due to the large pipe diameter and thin wall thickness during the forming process, and the processing of the bellows cannot be completed.

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