The Quality Control And Improvement Of Hull Block Fabrication

In order to improve shipbuilding quality and control cost, China AA Company introduces and implements FMEA and SPC into precision quality control during hull block fabrication, to achieve zero-defect of block precision quality control and increase customers satisfaction.The paper summarized current situation of block precision control, it was found that some defects happen 1569 times per month, and even the waste and loss per RMB 10000 outputs reaches up to RMB 390.46, and the complaints from customers up to nearly 50 times per month. It is in need of immediate overcome and improve。The paper use research methods of FMEA and SPC, analyzes the various defects in the hull block fabrication procedures and potential reasons to cause these defects, then take special precautions scheme . Through the judge criterions of PFMEA, it frames theoretically the judge criterions suitable for ship industry: severity (S), Detection(D) and Occurrenc(eO). Meanwhile, Mistake-proof method is listed in the judge criterions of detection to really achieve per-mistake-proof. This method can realize zero-defect quality control of mistake-proof and omission-proof, then to achieve precision fabrication of hull block and also practiced in actual block fabrication. The paper adopt SPC method to make dynamic monitor and analyze the key control points of selected block, and then take special precautions scheme to achieve"premeditated control"of block precision, to gain the stability of block dimension control for all projects.The thesis utilizes the above-mentioned two quality control methods,making AA company not only achieve zero-defect quality for mistake-proof and omission-proof etc., but also achieve the stability of dimension control. The production capacity of block is increased 14.6%, and the complaints from customers are down 60%. Hull block fabrication precision quality control and improving lay excellent foundation for consistent improving activity in the whole company, meanwhile other ship enterprises can learn it in block precision quality control.