With the rapid economic growth and the continuous advancement of industrialization, the demand for pressure vessels made of austenitic stainless steel is increasing, and the heads are often cold-stamped elliptical heads. Cold stamping elliptical heads are widely used because of their good forming performance, high forming accuracy, and the ability to achieve mass production. The cold stamping process will have a residual impact on the head, which is mainly reflected in the plastic deformation of the sheet and the thickness change. Plastic deformation will induce martensitic transformation of austenitic stainless steel. While the strength and hardness of the material increase, the plasticity and toughness will also decrease. After cold stamping, the mechanical properties of the material on the head will also change to varying degrees according to the plastic deformation at the location.

　　At present, the prediction formula for plastic deformation of elliptical heads given by domestic and foreign standards is only for the maximum plastic deformation of heads, and cannot fully reflect the residual effects of cold stamping of heads. Changes in material mechanical properties and wall thickness caused by cold stamping may affect the safe service of the container. In recent years, the failure of the head has occurred several times. Therefore, it is of great practical significance to study the residual effect of cold stamping of the head and establish a vessel analysis method considering the residual effect of cold stamping of the head to ensure the safety and reliability of the pressure vessel design.

　　(1) Using ABAQUS to establish the numerical simulation method of the cold stamping process, through the cold stamping forming simulation of different specifications of the head, the plastic deformation distribution law and the thickness change law of the head are obtained, and the corresponding formula prediction method is established.

　　(2) Analyze the changing law of the residual effect of cold stamping on the head under the different conditions of forming times, die chamfering, sheet diameter and material constitutive. The results show that: multiple forming and material constitutive have little effect on the plastic deformation of the head; the larger the mold chamfer, the smaller the plastic deformation, and the smaller the diameter, the more obvious the impact of the head; Plastic deformation of the head will increase accordingly.

　　(3) The cold stamping test of the head was carried out, and the measured plastic deformation of the head in the longitudinal, circumferential and thickness directions was compared with the calculation results of the numerical simulation and the prediction formula. It was found that the calculation results of the two can be The test data are in good agreement, so the calculation results of these two methods are reliable.

　　(4) Two container modeling methods considering the residual effects of cold stamping of the head are established: by importing the results of the stamping simulation, the head model is rebuilt in ANSYS, which can restore the calculation results of the numerical simulation of cold stamping to the greatest extent, but the process It is relatively complex and suitable for containers with simple structure; the use of cold stamping residual influence prediction formula to simplify the head modeling method can simplify the modeling steps under the premise of ensuring the calculation accuracy, and has wider applicability.

　　(5) Through the strain strengthening test of the container, the change of strain on the head and cylinder with pressure is measured, and the data is compared with the calculation result of the container modeling method considering the cold stamping residual effect of the head. The test data is compared with the simulation. The results are basically consistent, which proves that the modeling method is reasonable.

　　(6) Analyze the influence of head thickness change and material mechanical properties change on the finite element analysis of the container one by one.

　　The results show that: when considering the changes in the mechanical properties of the material, cold stamping increases the yield strength of the material, so that the head is still in the elastic section under the action of the strengthening pressure, and the deformation is greatly reduced; when modeling according to the thickness change law of the head, the seal The strain of the head under the strengthening pressure has increased; when considering the residual effect of cold stamping, except for the top area of the head, no new plastic deformation appears in other areas under the strengthening pressure.