Plasma solution to optimize cutting production technology for small and medium shipyards

In the past, small and medium-sized shipyards in the country used flame cutting equipment to cut steel plates. Due to the limitations of production technology and site, some shipyards gradually exposed the weaknesses of insufficient annual production capacity and low product quality.

The predecessor of Jiangsu Sugang Shipyard was a subsidiary of Nanjing Jianghai Group established in the 1970s to provide barge support for inland water transportation. In 2005, it was transformed into a private enterprise with more than 1,000 employees. The freighters and barges produced are mainly exported to Hong Kong and other regions. Since 2003, the Sugang Shipyard has used the first CNC flame-cutting machine tool, and the limitations of the production capacity after the restructuring has not been able to keep up with the order speed. In China, the use of plasma cutting technology by large shipyards has become quite common, which has laid a good technical foundation for China to become the world's third largest shipbuilding base and shorten the distance with Japan and South Korea. However, due to restrictions on funds, docks and other factors, domestic small and medium-sized shipyards cannot compete with large shipyards in terms of site, process level and labor, and production capacity and production technology cannot keep up with new international market demands.

In order to adapt to the fierce market competition and increase production capacity, Sugang Shipyard purchased two sets of flame cutting systems in 2006, becoming an emerging shipbuilding enterprise with an annual output value of more than 200 million. At the beginning of 2008, Sugang had a big move. It bought 500 mu of open space along the river for the expansion of the second phase of the plant, targeting the larger international market, and decided to use advanced plasma cutting technology to improve production efficiency and productivity. To build a freighter of 12,000 to 18 000 tons. Under the recommendation of Shanghai Priusson Machinery Co., Ltd., which provided equipment, Sugang Shipyard finally selected the new high-speed fine plasma HSD130 cutting system from Haibide, and improved the original flame cutting machine with two The high-speed fine HSD130 plasma torch power supply increases production efficiency by 300% and reduces operating costs by 30%, effectively promoting the development of the enterprise.

“More than 70% of the cutting processing of Sugang Shipyard is used to cut carbon steel plates of 10~14mm. At present, most of this work has been completed by the newly installed HSD130 plasma cutting machine, and a few 40~50mm structural plates are still Use flame cutting to supplement." Zhou Zhou, director of the Sugang Shipyard, said, “Using plasma cutting, the cutting speed is several times higher than before, the cutting quality is obviously improved, and there is no need to remove the slag and sanding twice. The workers are always busy loading and unloading. Or transport the cut sheet to the assembly site. In order to match the efficiency of the plasma cutting equipment, we have purchased the site expansion plant. The new plant is expected to be put into use by the end of 2009, when it is estimated that at least 3 high-speed plasma HSD130 will be installed. And a high-performance plasma HPR260, and may eliminate flame cutting. We also have a new plan for logistics support to ensure that the in-plant transportation can keep up with the production process. With these guarantees, our orders and production plans have been scheduled for 2012. There will be a number of large ships starting construction at the same time."

The use of HSD130 by Sugang Shipyard can meet the requirements of the cutting surface, and the cutting surface is smooth and tidy, and there is no slag, which saves the subsequent process. The investment cost of HSD130 is very economical, and it is an entry-level product that is very suitable for small and medium-sized shipyards to upgrade from flame cutting technology to plasma cutting. The operation of plasma CNC is also very easy, and it requires only simple training.

Nowadays, more and more ship owners are considering the use scale of CNC cutting technology as the necessary standard for production capacity and production quality when inspecting the shipyard. The use of plasma cutting technology not only improves the production efficiency of shipbuilding, but also ensures that the shipyard can deliver the ship on time, and raises the grade of the shipyard, and wins more orders for small and medium-sized shipyards. More importantly, plasma cutting technology has improved the quality of shipbuilding, reduced manufacturing costs, improved management level and quality, and is one of the foundations for the adjustment and upgrading of China's shipbuilding industry.

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