Forging forming process of heteromorphic transition section of super large pressure vessel

Abstract

The invention relates to a forging process of super large workpieces and provides a forging forming process of a heteromorphic transition section of a super large pressure vessel. The process comprises the following steps of: 1) punching; 2) drawing out; and 3) reaming with a special lower reaming anvil by adopting free forging, wherein the forming surface of the special lower reaming anvil is raised along the low and middle parts of the two axial ends of a forging stock; aiming at forming of each indexing region of the forging stock, firstly the two axial ends of the indexing region are deformed through forging and pressing and are matched with the middle raise of the special lower reaming anvil to form bidirectional axial limits; and after reaming, the inner circumferential surface of the forging stock comprises an inner concave surface formed through the middle raise of the special lower reaming anvil. The process has the following beneficial effects that: through the final inner concave surface of the inner circumferential surface of the forging stock, the dressing metals are saved, the raw material consumption can be reduced, the machining allowance is reduced, the metal flow lines are prevented from being cut off and the forging block quality is improved; and the process is suitable for manufacturing the heteromorphic transition section forging of the super large pressure vessel.

Description

technical field [0001] The invention relates to a forging process of an extra-large workpiece, in particular to a forging forming process of a special-shaped transition section of an extra-large pressure vessel. Background technique [0002] The discontinuity of the pressure vessel is divided into the discontinuity of the overall structure and the discontinuity of the local structure. Among them, the discontinuity of the overall structure refers to the source of stress or strain that affects a considerable part of the structure, that is, the discontinuity of the geometry, material and load of the vessel, such as the connection area between the head and the shell, different diameters, thicknesses, The connection of materials, etc.; the discontinuity of the local structure refers to the stress or strain source that affects the structure in a relatively small range, such as small holes, partial welds, small rounded corners, etc. The discontinuous area of ​​the pressure vessel ...

AI Technical Summary

Problems solved by technology

Taking a special-shaped transition section as an example, its inner diameter is about 3m, and the spherical part of the special-shaped transition section corresponds to a central angle of about 30°. It is estimated that the step difference of the inner hole is about 200mm. Therefore, if figure 1 and Figure 5 As shown, the volume of the blank after forging is about twice the volume of the final special-shaped transition section, so the cutting amount of the final machining of this process is large, which greatly increases the machining cost and causes huge waste of raw materials. The line is roughly parallel to the axial direction, and machining will cut off the natural flow line of the special-shaped part of the metal, which is detrimental to the overall performance of the forging

Images