Marine sail-shaped plate line-fire bending plate live wire path and flame parameter determination method

Abstract

The invention discloses a marine sail-shaped plate line-fire bending plate live wire path and flame parameter determination method. The method comprises the following steps: (S1) determining the sizeand shrinkage amount of a target sail-shaped plate and a plate surface segmentation interval H; (2) precisely unfolding the formed curved surface, defining a contraction unit, acquiring coordinates ofa live wire end point and a split point on the unfolded curved surface, and calculating a plate edge contraction amount and a middle contraction amount; (S3) determining a coordinate transformation rule Re between a roll bending rear plane and a roll bending front curved surface, and establishing a live wire path expression model on the curved surface; and (S4) constructing a flame parameter calculation model based on a neural network, training the flame parameter calculation model to be accurate based on the training sample, and outputting a fire path starting point distance, a water-fire distance and a heating duration. The live wire path direction, the live wire end point position and the flame parameters are determined through the hull plate accurate expansion method and the flame parameter calculation model, the obtained live wire path and flame parameters are more accurate, the one-time forming quality is high, and the forming efficiency is improved.

Description

technical field [0001] The present invention relates to a method for determining a path of a bent plate and its parameters, and more particularly, to a method for determining the path of a fire line of a water-fired bent plate of a marine sail-shaped plate and a method for determining the parameters of a flame. Background technique [0002] In the water-fire bending process of marine outer plates, the process of water-fire bending is mostly done manually by craftsmen based on their own experience, resulting in unstable forming quality of outer plates and low efficiency, and it is difficult to guarantee the one-time forming quality of water-fire bending. The position of the fire line and the parameters of the flame are the key factors affecting the quality of the primary forming of the water-fired bending plate. At present, the main methods for determining the position of the fire line and the parameters of the flame are: 1. Use laser measurement technology to obtain informati...

AI Technical Summary

Problems solved by technology

[0002] In the water-fire bending processing of marine outer plates, the processing process of water-fire bending plates is mostly completed by craftsmen based on their own experience, resulting in unstable and low-efficiency outer plate forming quality, and it is difficult to guarantee the one-time forming quality of water-fire bending plates

The position of the fire line and the parameters of the flame are the key factors affecting the quality of the primary forming of the water-fired bending plate. At present, the main methods for determining the position of the fire line and the parameters of the flame are: 1. Use laser measurement technology to obtain information, and then let the workers plan the line of fire based on experience. The accuracy of the method is low; 2. Use the iterative method to find the point with the largest height difference as the heating point of the fire line to realize the planning of the fire line. However, this method is only suitable for the processing of plates with one-way curvature changes, and most hull panels have two-way curvatures , this method is not applicable to the hull plate; 3. Scan the surface of the pre-rolled plate, compare it with the formed surface, and plan the position of the next line of fire according to the size of the chord line of the feature points between the two. The next plan can only generate the next line of fire, so it is necessary to detect and process the information of the processed surface one by one during the processing process, and the process is cumbersome

Therefore, the current line of fire path planning and determination of flame parameters have problems such as lack of automation and accuracy

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