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Precise control method for thickness tolerance of marine steel plate

A marine steel plate, precise control technology, applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the difficulty of increasing the thickness tolerance control of shipbuilding steel plates, affect the stability of the hull operation, and the high center of gravity of the hull, etc., to achieve easy control , realize precise control, and improve the effect of steel plate yield

Active Publication Date: 2018-11-09
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the hull structure of this type of ship is special, resulting in a greatly reduced proportion of displacement to the total weight of the ship, resulting in a high center of gravity and poor stability. In order to ensure the stability of the hull, the thickness tolerance of the shipbuilding steel plate must be controlled within a small range. Prevent the overweight ratio of the steel plate from being too high, which will affect the stability of the hull operation
The new classification society regulations require that the average value of ship plate thickness tolerances must be a positive tolerance, which also increases the difficulty of shipbuilding plate thickness tolerance control to a certain extent

Method used

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  • Precise control method for thickness tolerance of marine steel plate

Examples

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Effect test

Embodiment 1

[0019] Production example of an order for marine steel plates with a thickness δ of 6-9mm: Before production, a detailed production plan must be formulated, preparations for production should be made, and production conditions should be confirmed to optimize production according to the following steps:

[0020] (a) Blank design: set the blank for the order of marine steel plate with an order thickness of 6-9mm, select the blank thickness as 140-160mm, especially select the optimal thickness of the blank as 150mm; set the width ratio <1.3, and the length of the rolled piece 12-30m, increase the cutting amount of the head and tail arcs of the rolled piece to ensure that the head and tail arcs can be cut evenly, and increase the restrictions on the material type, width ratio and length of the rolled piece to ensure the length of the steel plate during rolling Uniformity of thickness in direction;

[0021] (b) Rolling thickness setting: According to the latest classification socie...

Embodiment 2

[0026] Production example of an order for marine steel plates with a thickness δ of 10-25mm: Before production, a detailed production plan must be formulated, preparations for production should be made, and production conditions should be confirmed to optimize production according to the following steps:

[0027] (a) Blank design: design blanks for marine steel plate orders with an order thickness of 10-25mm, choose a blank thickness of 210-230mm, especially select the optimal thickness of the blank as 220mm, expand width ratio<1.5, and roll length 10-35m , to increase the cutting amount of the head and tail arc parts of the rolled piece, to ensure that the head and tail arc parts can be cut evenly, and to ensure the thickness of the steel plate in the longitudinal direction during the rolling process by adding restrictions on the material type, width ratio and length of the rolled piece Uniformity;

[0028] (b) Rolling thickness setting: According to the latest classification...

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Abstract

The invention provides a precise control method for shipbuilding steel plate thickness tolerances. The method comprises the following steps that (a) blanks are set according to the shipbuilding steel plates with different thicknesses; (b) rolling thicknesses are set according to the thicknesses of the shipbuilding steel plates; (c) a rolling mill is calibrated through trial rolling analysis before production; (d) a blank heating technology is optimized; (e) steel rolling technological parameters are optimized. By optimizing the aspects, precise control over the shipbuilding steel plate thickness tolerances is realized, the range of the shipbuilding steel plate thickness tolerances is reduced, the requirement of special ship types for steel plate thickness tolerances is met, the yield of steel plates for manufacturing high value-added ship types is increased, the technology of the precise control method is simple, and the production process is easy to control.

Description

technical field [0001] The invention relates to a production process of a steel plate for a ship, in particular to a method for precisely controlling the thickness tolerance of a steel plate for a ship. Background technique [0002] The shipbuilding industry is a modern comprehensive industry that provides technical equipment for industries such as water transportation, ocean development and national defense construction. However, with the changes in the market demand structure, low value-added bulk carriers have overcapacity, some small shipyards are on the verge of bankruptcy, and large shipyards are also hit hard; Ships, ro-ro passenger ships, and especially luxury cruise ships are in short supply. From a global perspective, the production capacity of special high-value-added ships is facing a huge gap. Whether it is possible to upgrade the ship type is of great significance to the shipyard. [0003] For special ship types with high added value, due to different hull st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/16
CPCB21B37/16B21B37/165
Inventor 靳星吴俊平黄龙高德平李伟廖仕军
Owner NANJING IRON & STEEL CO LTD