Method for pressing circular tubes by oil press

Abstract

The invention relates to a method for pressing circular tubes by an oil press in the shipbuilding process, which comprises that: 1, an upper die and a lower die are designed, the upper end face of the upper die is provided with arc grooves corresponding to the diameter of a circular tube to be pressed, the upper die is fixed with a pressure head of the oil press, and the lower die is locked on a press platform of the oil press by a limit block; and 2, press lines of which the interval is 50mm are marked along the length direction of a plate, the plate which is prepared and marked with the press lines on the lower die is flatly placed, the pressure head of the oil press drives the upper die to run downwards and act on the press lines, the action is repeated to press the positions of various press lines, the plate is gradually pressed into a semi-finished product circular tube of which the middle is reserved with a gap of 20mm, the gap of 20mm of the semi-finished product circular tube is sealed, and fixed by welding, and the semi-finished product circular tube is welded and corrected to finally form the circular tube. The method only needs one oil press, and is matched with special dies to process the circular tubes, and not only reduces the dependency on a special tube-rolling machine, but also can improve the wall thickness of rolled tubes, reduce the requirements on equipment configuration of shipyards and shorten the shipbuilding period.

Description

(1) Technical field [0001] The invention relates to a method for pressing a round pipe by using an oil hydraulic press in the ship building process. It belongs to the technical field of shipbuilding. (2) Background technology [0002] In the process of ship construction, some parts are designed to be round or round due to design and functional requirements (such as chain pipes, chain buckets, chain lockers of some ships). Shipyards routinely use special coilers for rolling or outsourced processing, and purchase seamless steel pipes that exceed the conventional rolling capacity. There are following problems in above-mentioned conventional method: [0003] 1. According to the working capacity of the plate rolling machine, the plate rolling machine configured by the general shipyard can only roll plates with a thickness of 1500mm×12mm and round pipes with a diameter greater than 300mm at most. For thick-walled pipes, only seamless steel pipes can be purchased. The rolling ra...

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Problems solved by technology

Narrow rolling range and high purchase cost

[0004] 2. Due to the use characteristics and design principles of the ship, the utilization rate of the plate rolling machine is very low during the ship construction process, while the use of the hydraulic press is very frequent. Generally, the shipyard only configures the hydraulic press, so the plate rolling can only be outsourced, which increases the manufacturing cost. long cycle

[0005] Due to the above reasons, the plate rolling machine equipment is idle or the ship manufacturing cycle is lengthened, and the cost increases

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