Study On Cold Forming And Detection Technology

With the rapid development of Chinese shipbuilding industry, profiles of hydraulic cold forming process will be used more widely than before. Using cold forming equipment of profiles will determine the quality of profile forming, and thus directly affect the quality and cost of hull construction. To improve the quality of profile shape detection technology and the production technology of small and medium shipyards, research corresponding CNC profile hydraulic cold bending equipment will bring good economic and social benefits.Firstly, this paper describes the shipbuilding development situation of domestic and foreign, and then analyzes the use of endpoint measurements and non-endpoint measurements of the two profiles forming testing to compare their advantages and disadvantages. We propose a new profile forming non-endpoint measurement called chord-angle measurement control method. This testing method of profile forming does not depend on the detection of profile's endpoint, thereby eliminating the large testing organization of hydraulic cold forming equipment, and simplifying the structure of cold forming equipment. This method can uniquely determine the shape of the spline by using the mathematical calculations.Secondly, the bending experiment imitates the neutral curve in the plane work bench by using copper and analyzes such as feed step and fulcrum distance according to the processing parameters. The size of feed step in a larger spline curvature should be reduced accordingly, and in the small curvature may be increased comfortably. The fulcrum needs to refer from the feed step to select reasonable steps avoiding the bending process to affect the curve shape because of a number of alternating positive and negative bending. On this basis, this paper makes some analysis to reduce the accumulation of errors in the sole up and puts forward to compensate the control angle in the forming process. The copper only swings within a small range on both sides of the spline to make sure the shape of the copper more accurately. Thirdly, this paper assumes that the processing parameters are selected reasonable, and then establishes a simple equation by using geometric method for each copper bent depth and its corresponding control angle. It verifies accuracy and reasonableness of the equation by using computer graphics simulation of the copper wire forming process, which provides a certain reference for profile cold bending shape control automatic detection system.Finally, it selects some appropriate instrumentation according to the series of YLW profiles hydraulic bending machines'characteristics and parameters. It imagines that the instrumentation will be installed in reasonable positions of the machine. The accurate detection and control of the depth of processing will be realized. And the chord-angle measurement control method will be achieved in this series profile hydraulic bending machine. It can improve production efficiency of profiles cold forming and detection accuracy.