Strain strengthening pressure device and pressure method for austenitic stainless steel low-temperature vessel

Abstract

The invention discloses a strain strengthening pressure device and pressure method for an austenitic stainless steel low-temperature vessel. The strain strengthening pressure device for the austenitic stainless steel low-temperature vessel comprises a pressure device, deformation sensors, a frequency changer, a measurement and control signal processor and a computer, wherein the deformation sensors are loaded on a to-be-processed vessel. The strain strengthening pressure method for the austenitic stainless steel low-temperature vessel comprises the following steps of: delivering pressure into the to-be-processed vessel by the pressure device; transmitting deformation signals detected by the deformation sensors to the measurement and control signal processor for processing; then, transmitting to the computer; comparing acquired signals by the computer according to processing control software; then, sending out control signals; respectively controlling the frequency changer and a switch of an electric check valve through the measurement and control signal processor; performing a pressure operation and a pressure maintaining operation by controlling the pressure device through the frequency changer; and performing a pressure-relief operation through opening the pressure-relief electric check valve. According to the strain strengthening pressure device for the austenitic stainless steel low-temperature vessel, the deformations of multiple parts are monitored by adopting the circumference and axial length sensors, so that 1-10 percent of plastic deformation can be generated by the to-be-processed vessel according to the process requirement, and the goal of strain strengthening is achieved.

Description

technical field [0001] The invention relates to the field of austenitic stainless steel low-temperature container processing, and at the same time relates to the technical field of industrial automatic control, and belongs to the technical category of equipment automatic processing. Background technique [0002] Containers used to store cryogenic liquids are called cryogenic containers. Austenitic stainless steel has good low-temperature performance and can be used to manufacture low-temperature pressure vessels. At the same time, austenitic stainless steel itself also has significant low temperature strain strengthening characteristics. The so-called strain strengthening characteristic is when austenitic stainless steel is subjected to a force greater than the yield strength R P0.2 The tensile stress σ k , permanent plastic deformation will occur after unloading; when reloading, when the stress is less than σ k Within the range, the stress-strain keeps growing elasticall...

AI Technical Summary

Problems solved by technology

In the forming and strengthening process of strain-strengthened austenitic stainless steel cryogenic vessels, high-pressure liquid is used to cause permanent plastic deformation of no more than 10% of the welded vessel. Excessive permanent plastic deformation will make it difficult for the performance of low-temperature vessels to meet relevant manufacturing and testing standards requirements

The current problem encountered in the production of such low-temperature containers is: because the low-temperature containers have ribs, openings or other discontinuous structures, it is difficult to produce uniform deformation of each part of the container during strain strengthening, resulting in difficult control of product quality. Or it takes a lot of time to control the quality, resulting in a decrease in production efficiency and an increase in production costs

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