Liquid die forging rolling composite forming method for H13 hot work die steel unusual section large forging

Abstract

The invention relates to a liquid die forging rolling composite forming method for an H13 hot work die steel unusual section large forging. The liquid die forging rolling composite forming method comprises the following steps of: (1) smelting; (2) liquid die forging, namely fixing a liquid die forging die on an indirect extrusion casting machine, pouring hot work liquid die forging die solution to the liquid die forging die and keeping the pressure for 35-90s under the pressure to obtain a near-net-section ring blank, wherein the pouring temperature is 1530-1630 DEG C; the pressurizing speed is 30-40mm / s; the filling time is 1-6s; the specific pressure is 150-200MPa; (3) homogenizing; (4) waste heat isothermally rolling, namely reducing the temperature of the homogenized near-net-section ring blank to be 1065-1175 DEG C and carrying out waste heat isothermally rolling on a diameter shaft composite rolling ring machine; (5) heat treating; and (6) finishing. With the adoption of the liquid die forging rolling composite forming method for the H13 hot work die steel unusual section large forging, the blanking preparing process of the hot work liquid die forging die ring forging can be simplified, the cost can be reduced, the production efficiency can be improved, the microstructure state of a nickel base high-temperature hot work liquid die forging die ring forging can be effectively improved, and the comprehensive mechanical performance can be effectively improved.

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 forging-rolling composite forming method for hot-work die steel with different cross-sections and large rings. Background technique [0002] H13 is a commonly used hot work die steel. The large rings prepared by using H13 are mainly used in the field of special vehicles and equipment manufacturing, 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 or...

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