Reshaping method for barrel with diameter greater than 1 meter

Abstract

The invention relates to a reshaping method for a barrel with a diameter greater than 1 meter. A heating temperature T during a process of reshaping the barrel and the swelling volume of the diameter of the barrel are confirmed, a gap between an inner surface of the barrel and a reshaping core mould is controlled, a material swelling coefficient of the swelling core mould is greater than the swelling coefficient of the barrel material, the thickness and the size of the swelling core mould are far greater than the thickness and the size of the barrel during a cooling process after heating, so that a cooling speed of the barrel is greater than the cooling speed of the swelling core mould, the barrel is subjected to thermal contraction and deformation during the cooling process, and the deformation of the barrel is limited by the swelling core mould, so that the functions of controlling deformation and reshaping are achieved.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for correcting the shape of a cylinder with a diameter greater than 1 meter. technical background [0002] The forming methods of large cylinder parts mainly include sheet metal roll welding forming method and spinning forming method. Among them, the forming accuracy of the sheet metal roll welding forming method is poor in both dimensional accuracy and shape accuracy, and is generally used in low-pressure container thick plates or products that do not require high forming accuracy; The forming precision is high, and it is generally widely used in the manufacture of aerospace solid rocket motor metal shells and the production of military products. In aerospace solid rocket motor metal casings and military products, high-strength steel is used for spinning or rolling welding cylinder assembly and welding. The structural characteristics of the products are: thin wall,...

AI Technical Summary

Problems solved by technology

The main problems of this method are that it is inconvenient to operate and the cost is high.

In particular, it is difficult to observe and adjust the hoisting of the special thermal expansion mandrel into the inner hole of the preheated thin-walled cylinder, and it is only suitable for small diameter cylinders with a short length of 0.8m; Long and large-diameter cylinder, due to the large size and poor rigidity of the cylinder, the large-scale shape-calibrating tooling is heavy and difficult to adjust, and it is easy to damage the cylinder and even cause the product to be scrapped

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