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Hot isostatic pressing forming method for homogeneous sheath with gradient gradual change structure at connection interface

A technology of hot isostatic pressing and sheathing, which is applied in the field of advanced manufacturing and manufacturing aerospace, to achieve the effect of shortening the process and cycle, overcoming sudden changes in organization and performance, and overcoming technical bottlenecks that are difficult or impossible to process

Active Publication Date: 2015-12-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the SLM forming process has the characteristics of laser fast melting and fast cooling, the prepared envelope has fine columnar crystals and needle-like structures.

Method used

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  • Hot isostatic pressing forming method for homogeneous sheath with gradient gradual change structure at connection interface
  • Hot isostatic pressing forming method for homogeneous sheath with gradient gradual change structure at connection interface
  • Hot isostatic pressing forming method for homogeneous sheath with gradient gradual change structure at connection interface

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example 1

[0047] Using the present invention to manufacture Ni625 turbine disc parts is an example. The manufacture of high-performance aerospace engines is one of the bottlenecks restricting my country's new generation of heavy-duty rockets. As the thrust-to-weight ratio of the new generation of engines continues to increase, its key parts are required to be lighter in weight and have higher mechanical properties. High-performance integral forming technology is required to meet these requirements. Precision casting is currently the mainstream manufacturing technology for key parts such as aerospace engine turbines at home and abroad. However, castings have outstanding problems such as uneven structure, surface quality, internal shrinkage, shrinkage, and inclusions, and it is difficult to meet the high performance and lightweight requirements of the new generation of engines. . For example, in a 460-ton engine turbo pump, the core turbine parts have a linear velocity as high as 300m / s,...

example 2

[0058] Using the present invention to manufacture Ti6Al4V casing parts is an example. With the introduction of new aircraft, higher requirements are put forward for the new generation of engines in terms of working performance indicators. For example, the A320 / B737 and other models with the largest active market share are planning to develop the fifth-generation engine. 0.54-0.55kg / daNh); the noise is 15 decibels lower than the fourth stage of FAR36; the NOx emission is reduced by 40-50%; the maintenance cost is reduced by 15-25%; the service life is extended by 25%. The improvement of these working performances has led to the increasing demand of the engine for high thrust-to-weight ratio, complex structure and high reliability. For example, the tensile strength of the intermediate case when it is in service at 350 ° C is higher than the original index of 500 MPa, which exceeds the existing castings. The performance limit puts forward higher requirements for manufacturing te...

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Abstract

The invention discloses a hot isostatic pressing forming method for a homogeneous sheath. According to the method, a hot isostatic pressing (HIP) / selective laser melting (SLM) 3D printing compound technology is adopted. The problems that the production period is long, the manufacturing cost is high, the sheath removing process is complicated, the connection interface has diffusion reaction to pollute a manufactured piece and the like when a heterogeneous sheath with a complicated shape is formed by the traditional method is solved by the homogeneous sheath which is formed by the SLM adopted by the invention. Meanwhile, the inner side surface (the surface where the homogeneous sheath is in contact with powder in hot isostatic pressing) of the homogeneous sheath is designed into a gradient porous gradual change structure, so that the tissue at the connection interface has a gradient change structure after hot isostatic pressing, so that the defect that the tissue and performance of an interface between the homogeneous sheath formed by SLM and an HIP compact body are choppy is overcome, and the manufacture piece with excellent mechanical performance is finally formed.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing, and specifically relates to a hot isostatic pressing forming method. The method adopts a homogeneous sheath with a gradient structure at the connection interface to realize near-net hot isostatic pressing powder forming of complex high-performance components , especially suitable for the manufacture of key components with complex structures and high performance requirements in the aerospace field. Background technique [0002] Hot isostatic pressing powder near net shape (NetNearShapeHotIsostaticPressing, NNS-HIP) is the use of high temperature (700-2000 ℃), high pressure (70-200MPa) combined with mold shape control technology, so that the gas medium evenly acts on the shape control mold jacket The densification and shaping of the powder can be realized on the surface. Hot isostatic pressing powder near-net shape can realize the powder overall near-net shape of precious parts such as cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/115
CPCY02P10/25
Inventor 宋波蔡超薛鹏举史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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