Method for machining elliptical end socket

Abstract

The invention discloses a method for machining an elliptical end socket. The method includes the following steps that first, discharging is performed; second, welding is performed; third, cold pressing is performed so that preliminary forming is achieved; fourth, end socket pressing is performed, wherein integral forming is performed through pressing so that a semi-finished end socket can be obtained; fifth, cold spinning is performed, wherein the semi-finished end socket is subjected to cold spinning so that final forming is achieved; sixth, heat treatment is performed, wherein the temperature of an empty furnace is raised to 400 DEG C, the end socket is put into the furnace and heated to 500 DEG C to 600 DEG C, the temperature is kept for 20 minutes to 30 minutes, the temperature is lowered to 400 DEG C, and the end socket is taken out of the furnace and naturally cooled; seventh, grooving and grinding are performed; eighth, acid washing is performed, wherein acid wash is evenly smeared onto the whole outer surface of the end socket, preliminary washing is performed, and then the end socket is washed clean with clean water. According to the method, heating is not performed before forming, and materials can not degrade; the cold pressing, the end socket pressing and the cold spinning are adopted for forming, and changes of size can not be caused; a passive film is formed on the surface of the end socket through acid washing; harmful gas and smoke can not be generated.

Description

technical field [0001] The invention relates to a head manufacturing process, in particular to a processing method for an elliptical head. Background technique [0002] As an indispensable part of normal pressure and pressure vessels, the head is widely used in pharmaceutical, food, chemical, biological, water treatment, environmental protection, electric power, boiler pressure vessels and other fields. The head is the two end caps of the pressure vessel and is the main pressure-bearing part of the pressure vessel. The quality of the head is directly related to the long-term safe and reliable operation of the pressure vessel. Most of the traditional heads are completed by hot stamping process. The hot stamping process has many shortcomings. Due to heating, the material will deteriorate, resulting in a decrease in the corrosion resistance of the stainless steel head, which is not suitable for the processing of stainless steel heads; heating and forming will cause the mold to...

AI Technical Summary

Problems solved by technology

Most of the traditional heads are completed by hot stamping process. The hot stamping process has many shortcomings. Due to heating, the material will deteriorate, resulting in a decrease in the corrosion resistance of the stainless steel head, which is not suitable for the processing of stainless steel heads; heating and forming will cause the mold to be damaged. Due to thermal expansion and cooling shrinkage of the head, the size is difficult to control and the consistency is poor; due to heating, the surface of the head after forming is severely oxidized and difficult to remove; hot stamping needs to be heated to consume fuel and consume a lot of valuable resources; heating will produce a lot of harmful gases, pollute the environment