Machining method for assisting line heating forming of ship hull plate by utilizing electromagnetic force

Abstract

The invention provides a machining method for assisting line heating forming of a ship hull plate by utilizing electromagnetic force, and belongs to the technical field of ship hull plate forming machining. In the process of line heating forming, forming of a steel plate is assisted by utilizing the electromagnetic force, an electromagnetic coil is placed on the steel plate, and the position of the electromagnetic coil is adjusted. Due to the fact that a magnetic field generated by the electromagnetic coil acts on a vortex in the steel plate, mutually-interacted electromagnetic force is generated between the electromagnetic coil and the steel plate, the steel plate is extruded by the radial electromagnetic force, and the steel plate is promoted to carry out partial transverse shrinkage; and angle changing is generated on the steel plate by the axial electromagnetic force. Meanwhile, due to the fact that current parameters are adjusted to change the magnitude of the electromagnetic force, changing of stress and strain of the steel plate is controlled in the line heating forming process. Compared with traditional line heating forming, the method is higher in working efficiency and low in cost, and it is avoided that due to the over-temperature, the material performance is deteriorated and cracks are generated. The entire technology operation is simple, the stability is higher, the repeatability is better, the method can be adopted by an aluminum alloy plate and the like, and the universality is high.

Description

technical field [0001] The invention provides a processing method using electromagnetic force to assist the heating and forming of hull outer plate lines, and belongs to the technical field of hull outer plate forming processing. Background technique [0002] The wire heating forming technology, commonly known as the water-fire bending process, is a method commonly used by major shipyards in the world to process the complex curved surface of the hull, that is, using a heating source (such as oxy-propylene flame, etc.) The heating line is used for heating. During the heating process, the outer plate of the hull expands due to the temperature rise. At the same time, the cooling water is used for tracking cooling. At this time, the heated part of the outer plate shrinks rapidly after being cooled, and finally the outer plate generates residual heat near the heating line. The stress and strain will cause the ship's outer plate to bend and deform, so as to meet the processing req...

AI Technical Summary

Problems solved by technology

[0003] However, this processing method has the following defects: 1. Transitional dependence on worker experience, low degree of automation; 2. Low processing efficiency; 3. Poor processing accuracy; 4. For thicker steel plates (thickness generally exceeds 30mm) and Special steel plates have limitations. Traditional water and fire bending plates often require repeated processing many times when processing thick steel plates, which not only affects the forming efficiency but also has low precision; and special steel plates with strict temperature requirements often require temperature control at 700 ℃, while using the traditional water and fire bending process, in order to achieve the required deformation, the heating temperature often exceeds 900 ℃, resulting in the deterioration of the material properties of the steel plate, and even cracks in severe cases, which eventually lead to the unusable steel plate

Images