Liquid die forging and rolling compound formation method for stainless steel irregular-section large ring piece

Abstract

The invention discloses a liquid die forging and rolling composite forming method for large stainless steel rings with different cross-sections, which includes melting → liquid die forging → homogenization → waste heat isothermal rolling → heat treatment → finishing; After the die forging die is fixed on the indirect squeeze casting machine, the stainless steel solution obtained by melting is poured quantitatively into the liquid die forging die. 6s, the specific pressure is 150-200MPa, and the pressure is maintained at this pressure for 35-90s to obtain a ring blank with a near-end section; the isothermal rolling with waste heat is: the homogenized ring blank with a near-end section is cooled to 1120-1160°C , the waste heat isothermal rolling is carried out on the diameter-shaft composite ring rolling mill. The liquid die forging and rolling composite forming method for stainless steel rings with different cross-sections of the present invention can not only simplify the blank-making process of alloy rings, reduce costs and improve production efficiency, but also can effectively improve the microstructure of stainless steel rings, improve Comprehensive mechanical properties.

Description

technical field [0001] The invention relates to a short-process processing and forming method for large-diameter metal rings with complex cross-sections, in particular to a liquid-state forging-rolling composite forming method for stainless steel large-diameter rings with different cross-sections. Background technique [0002] Large rings made of stainless steel are mainly used in fields such as oil and gas, and the working environment is harsh. The special use environment puts forward almost strict requirements on the dimensional accuracy and comprehensive mechanical properties of the ring parts: on the one hand, the parts are required to have high-precision external dimensions to avoid subsequent machining, which wastes a lot of manpower and material resources and seriously reduces the performance of the ring parts. ; On the other hand, the parts are required to have an excellent organizational state in order to meet the requirements of comprehensive mechanical properties....

AI Technical Summary

Problems solved by technology

[0004]1) The process is lengthy, with many procedures and low production efficiency;

[0005]2) The rolled and expanded ring blank needs to be prepared by punching, and the final cross-sectional shape needs to be guaranteed by cutting excess dressing, so the material utilization rate is low;

[0006]3) The machining process cuts off the metal flow line, resulting in a decrease in the comprehensive mechanical properties of the ring;

[0007]4) The preparation process requires repeated heating, resulting in coarse grains, severe surface oxidation, and large energy consumption

[0008]The Chinese patent with publication number CN 101817134A discloses a method for short-flow casting-rolling composite forming of metal rings. Although the method satisfies the beneficial effects of short production process and saving energy, materials and manpower to a certain extent, the method adopts centrifugal casting ring billet, which cannot meet the processing requirements of ring parts with complex cross-sections, and the comprehensive mechanical properties of the metal ring parts produced are The performance is still not up to the requirements of extreme environments