Die and forging method for large-scale machine gate type forging

Abstract

The invention provides a large-scale engine casing forging mold and a forging method. The large-scale engine casing forging mold comprises a pre-forging mold and a finish-forging mold. The pre-forgingmold comprises a pre-forging upper mold and a lower mold which are matched with each other, and the pre-forging upper mold is provided with a pre-forging upper mold cavity recessed downwards on the top surface of the lower mold. The shape after the pre-forging upper mold cavity being combined with a lower mold cavity is the same as the shape of a pre-forging part. The finish-forging mold comprises the pre-forging upper mold, backing plates and the lower mold which are matched with each other, and the backing plates are fixed to the pre-forging upper mold by bolts to form a finish-forging upper mold. After the finish-forging upper mold and the lower mold are closed, the shape of the lower mold cavity is the same as the shape of a forging. According to the forging method using the large-scale engine casing forging mold, pre-forging and finish-forging integral forming are adopted, the requirements of an engine for weight reduction are greatly satisfied, the utilization rate of materialscan be effectively improved, the integrity of the metal flow line of the forging can be maintained, and the microstructure and mechanical properties of the forging can be improved.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a large-scale lock type forging die and a forging method. Background technique [0002] Large thin-walled casing forgings are key components of engines. With the increasing thrust-to-weight ratio of domestic engines, the demand for large thin-walled casing forgings is increasing. In the prior art, large thin-walled casings The forgings are all formed by ring rolling and welding. However, this solution has the following problems in the process of use: a. The welding method increases the weight of the parts, which affects the aircraft's requirements for weight reduction of parts; b. The welding scheme affects the strength and service life of the casing; c. The residual stress of the forging after welding is relatively large, and it is prone to deformation in the later stage, which affects the use of later parts; d. The raw material utilization rate of the ring rolling p...

AI Technical Summary

Problems solved by technology

[0002] Large thin-walled casing forgings are key components of engines. With the increasing thrust-to-weight ratio of domestic engines, the demand for large thin-walled casing forgings is increasing. In the prior art, large thin-walled casings The forgings are all formed by ring rolling and welding. However, this solution has the following problems in the process of use: a. The welding method increases the weight of the parts, which affects the aircraft's requirements for weight reduction of parts; b. The welding scheme affects the strength and service life of the casing; c. The residual stress of the forging after welding is relatively large, and it is prone to deformation in the later stage, which affects the use of later parts; d. The raw material utilization rate of the ring rolling plus welding scheme is low, Forging preparation cycle is long

At this stage, it is difficult to meet the growing demand for domestic engines for large thin-walled casing forgings

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