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Thermal coupling method for metal solid-solid composite additive blank manufacturing

A thermal-mechanical coupling and metal billet technology, which is applied in the field of metal forging, can solve the problems of composite billet cracking, composite billet bonding interface structure, mixed crystal unevenness, large deformation, etc., to improve the degree of deformation uniformity, improve the distribution of residual stress, The effect of improving tissue performance

Active Publication Date: 2021-04-13
CHINA FIRST HEAVY IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the deformation amount of the first pass generally adopts upsetting and large deformation process, but because the core temperature of the metal blank is higher than the edge temperature, the edge is a hard-to-deform area, and the edge interface is difficult to deform, which will lead to the joint interface of the composite billet Inhomogeneous mixed crystal structure, poor quality consistency, cracking of composite billet, etc.
In addition, the large amount of deformation in the first pass is not conducive to the diffusion and connection of elements at the bonding interface, and is not conducive to the elimination of the interface oxide film. Although the interface oxide film can be broken by large deformation, migrate and decompose by diffusion, it is still in the B type Inclusions exist near the bonding interface. Such inclusions are brittle and have different effects on the fatigue properties of the blank

Method used

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  • Thermal coupling method for metal solid-solid composite additive blank manufacturing
  • Thermal coupling method for metal solid-solid composite additive blank manufacturing
  • Thermal coupling method for metal solid-solid composite additive blank manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A thermal-mechanical coupling method for making blanks with metal-solid composite additives, comprising the following steps:

[0061] S1. Billet making: the initial blank made of Q345R is used, and the size of a single initial blank is: Grinding with milling machine and lathe to remove the rust layer and oxide layer on the surface of the initial blank (including the upper and lower joint interface and the surface of the side cylinder), and ensure the parallelism of the upper and lower surfaces of the initial blank to be welded with the metal blank cylinder The verticality and surface roughness are 1.6 μm, and then the surface of the initial billet is cleaned with alcohol or acetone to remove the surface oil, and then dried to obtain a metal billet with a clean surface, and then three metal billets with a clean surface are stacked vertically , and fixed with clamps, to the preform;

[0062]S2. Welding: Fix the preform on the vacuum electron beam welding table, move it ...

Embodiment 2

[0075] Step S1 and step S2 of embodiment 2 are basically the same as embodiment 1, the difference is that the initial blank is different and the forging process of step S3 is different, specifically as follows:

[0076] The experimental group used the initial blank made of Q345R. The size of a single initial blank is: φ2000mm×1575mm. The 158-ton integrated composite blank is composed of 4 initial blanks, and the single initial blank weighs about 39.5 tons. Therefore, a total of 8 upper and lower surfaces and 4 cylinder surfaces need to be processed.

[0077] The control group adopts the initial blank made of Q345R, which is selected according to the maximum thickness of the initial blank in the prior art. The size of a single initial blank is: φ2000mm×300mm. For a composite blank of 158 tons, 21 initial blanks are required. . Therefore, a total of 42 upper and lower surfaces and 21 cylinder surfaces need to be processed. The difference between the experimental group and the ...

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Abstract

The invention provides a thermal coupling method for metal solid-solid composite additive blank manufacturing, and belongs to the technical field of metal forging. The method comprises the steps of S1, blank manufacturing, wherein multiple metal blanks subjected to surface cleaning are stacked and formed, and prefabricated blanks are obtained; S2, welding, wherein the prefabricated blanks are welded to obtain a composite blank; and S3, forging, wherein after the composite blank is heated to the first temperature and subjected to heat preservation, after the temperature is reached, first-time hot-pressing forging is conducted at the deformation speed V1 and the deformation amount D1, then the composite blank is heated to the second temperature and subjected to heat preservation, after the temperature is reached, second-time hot-pressing forging is conducted at the deformation speed V2 and the deformation amount D2, third-time hot-pressing forging is conducted at the deformation speed V3 and the deformation amount D3, and the integrated composite blank is obtained. 1%<D1<5%, D2>=35%, D1+D2 +D3>=50%, and V2>V3>V1. Through mutual cooperation of three stages of thermal coupling processes, the effects of performance homogenization and component homogenization of dispersed oxide and the composite blank are effectively achieved, and the prepared integrated composite blank is good in mechanical property and long in fatigue life.

Description

technical field [0001] The invention relates to the technical field of metal forging, in particular to a thermal-mechanical coupling method for blank-making with metal-solid composite additive materials. Background technique [0002] Modern industrial high-end equipment such as aerospace, weapon equipment, and ships are rapidly developing towards the goal of large-scale, digital, and life-span and reliability increases under extremely harsh conditions, resulting in the size of key metal components such as nickel-based alloys, stainless steel, and titanium alloys becoming more and more large. The larger the size, the increasingly complex structure, and the continuous improvement of performance requirements, it also puts forward higher requirements for manufacturing technology. At present, domestic large-scale metal forgings are mostly made of additive material and then machined to obtain the final product. [0003] Additive blanking refers to the additive manufacturing metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 张心金王宝忠刘凯泉祝志超杨康朱琳时立佳
Owner CHINA FIRST HEAVY IND