A can for hot isostatic pressing of a multi-ring structure can part

Abstract

The application discloses a package for hot isostatic pressing processing of a multi-ring structure casing part, which comprises an inner cylinder, an outer cylinder, an upper end cover, a lower end cover, a mold core, a lower positioning ring and a prefabricated body; the sizes of the inner cylinder and the outer cylinder are determined according to the shape and size of the part, and the inner cylinder and the outer cylinder are used for wrapping the inner and outer annular surfaces of the part; the upper end cover and the lower end cover are annular plate structures, the upper end cover and the lower end cover are installed on the inner cylinder and the outer cylinder, and are used for wrapping the upper and lower end surfaces of the part, and the surface of the upper end cover is formed with exhaust holes; the mold core is annular, the side surface of the mold core is formed with a through hole, the through hole is used for accommodating the prefabricated body; one end surface of the mold core is installed on the lower positioning ring, the prefabricated body is processed according to the shape and size of a part support plate, and the prefabricated body is installed in the through hole in the side surface of the mold core. The technical scheme disclosed by the application alleviates the technical problems that the prior art cannot be used for processing of a multi-ring structure casing and cannot realize the processing and forming of a thin-wall support plate in a part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical manufacturing, in particular to a sleeve for hot isostatic pressing of a multi-ring structure casing part. BACKGROUND

[0002] With the development of aerospace equipment technology, the design of its parts tends to be thin-walled, special-shaped, and integrated, and increasingly high performance, dimensional accuracy, and surface quality are required. Typical components such as multi-ring structure casings are connected by webs between rings, and the parts are thin-walled and require high dimensional accuracy, which poses a great challenge to the corresponding forming technology. Conventional casting and deformation processes are increasingly unable to meet this development trend. In addition, for high-temperature structural materials such as titanium and nickel, the processing difficulty is great, and the material loss and long processing cycle will increase the cost of part production. Moreover, for complex thin-walled parts, the poor overall rigidity makes processing prone to uneven deformation.

[0003] In the prior art, patent document CN108326317A discloses a method of connecting TiAl alloy rings and Ti2AINb powder by hot isostatic pressing. The method uses a hot isostatic pressing step to obtain a cylindrical blank, and then mechanically processes the blank to obtain a part of the desired shape. Patent document CN105385869A discloses a method of forming a high-niobium TiAl alloy into a target shape. The method uses TC4 powder to obtain a cylindrical blank by hot isostatic pressing in a sleeve, and then mechanically processes the blank to obtain a part of the desired shape.

[0004] However, the sleeve and hot isostatic pressing method provided in the prior art cannot be used for processing multi-ring structure casings, and cannot achieve the processing and forming of thin-walled webs in the parts. SUMMARY

[0005] (I) Invention purpose

[0006] The purpose of the present application is to improve the filling effect of metal powder in the local thin-walled web part of the part on the basis of existing hot isostatic pressing processing technology, and to provide a sleeve and method for hot isostatic pressing.

[0007] (II) Technical solution

[0008] To solve the above problems, the first aspect of the present application provides a can for hot isostatic pressing, comprising: an inner cylinder, an outer cylinder, an upper end cover, a lower end cover, a mold core, a lower positioning ring and a prefabricated body; the size of the inner cylinder and the outer cylinder is determined according to the size of the part, and is used to wrap the inner and outer annular surfaces of the part; the upper end cover and the lower end cover are annular plate structures, and the upper end cover and the lower end cover are installed on the inner cylinder and the outer cylinder and are used to wrap the upper and lower end surfaces of the part; the surface of the upper end cover is provided with exhaust holes; the mold core is annular, and the side surface of the mold core is provided with a through hole for accommodating the prefabricated body; one end surface of the mold core is installed on the lower positioning ring; the prefabricated body is processed according to the shape and size of the part support plate; and the prefabricated body is installed in the through hole in the side surface of the mold core; and the lower positioning ring is installed in the closed space formed by the inner cylinder, the outer cylinder, the upper end cover and the lower end cover.

[0009] In one embodiment, the wall thickness of the inner cylinder or the outer cylinder is enlarged by n times on the basis of the inner and outer annular surfaces of the part, and then increased by 2-5 mm, and n is 1-ρ, wherein ρ is the tap density of the part powder.

[0010] In one embodiment, the surface of the upper end cover or the lower end cover is provided with a flange.

[0011] In one embodiment, the surface of the lower positioning ring and the mold core is provided with matching bosses or grooves, the bosses or grooves are matched to form a mortise and tenon structure, and the mortise and tenon structure is used for installing and positioning the mold core on the lower positioning ring.

[0012] In one embodiment, the first position at both ends of the prefabricated body is determined according to the second position of the intersection between the inner or outer annular surface of the part and the support plate, and the first position extends outward by 0.1 mm-0.5W on the basis of the second position, wherein W is the wall thickness of the inner or outer annular surface of the part.

[0013] In one embodiment, the both ends of the prefabricated body are provided with round corners, and the round corners are used to limit the prefabricated body in the through hole in the side surface of the mold core.

[0014] In one embodiment, the inner cylinder, the outer cylinder, the upper end cover and the lower end cover form a closed space by welding, and the closed space is divided into an inner powder cavity and an outer powder cavity by the mold core.

[0015] In one embodiment, the can further comprises an upper positioning ring, the other end surface of the mold core is installed on the upper positioning ring, and the upper positioning ring and the lower positioning ring respectively position the mold core based on the upper end cover and the lower end cover.

[0016] In the second aspect of the present application, a method for hot isostatic pressing is provided, comprising: preparing the can provided in the first aspect of the present application, filling metal powder in the can; performing hot isostatic pressing on the can to densify the metal powder; removing the inner cylinder, the outer cylinder, the upper end cover, the lower end cover and the lower positioning ring of the can; and removing the mold core of the can by chemical corrosion.

[0017] (III) Beneficial Effects

[0018] The above technical scheme of the present application has the following beneficial technical effects: the preform is arranged in the sleeve to ensure the machining quality of the local thin wall of the part; the densification of the powder is realized by the hot isostatic pressing of the metal powder, and the special complex part of the part is constructed; the high-temperature diffusion connection between the preform and the metal powder relieves the technical problems of difficult powder filling in the local thin wall part and easy meat lack in the near-net forming process of the powder hot isostatic pressing of the large and complex sheet metal structure part; and the technical problems that the prior art cannot be used for the machining of the multi-ring structure casing and cannot realize the machining and forming of the thin wall support plate in the part are relieved.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are one embodiment of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 It is a schematic diagram of a sleeve structure for hot isostatic pressing processing according to an embodiment of the present application;

[0022] Figure 2 It is a sectional view of the sleeve structure for hot isostatic pressing processing according to an embodiment of the present application; Figure 1

[0023] Figure 3 It is a schematic diagram of a part processed by a sleeve for hot isostatic pressing processing according to an embodiment of the present application;

[0024] Figure 4 It is an assembly schematic diagram of a mold core and a preform provided by an embodiment of the present application;

[0025] Figure 5 It is an enlarged schematic diagram of a preform provided by an embodiment of the present application;

[0026] Figure 6 It is a flowchart of a method for hot isostatic pressing processing according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] ​To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this application. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0028] The present application will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale. In the description of the invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Figure 1 This is a schematic diagram of a casing structure for hot isostatic pressing according to an embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional diagram.

[0030] refer to Figure 1 and Figure 2 This invention provides a casing for hot isostatic pressing, comprising: an inner cylinder 1, an outer cylinder 2, an upper end cap 3, a lower end cap 4, a mold core 5, a lower positioning ring 8, and a preform 9. The dimensions of the inner cylinder 1 and the outer cylinder 2 are determined according to the external dimensions of the part to be processed, and are used to wrap the inner and outer annular surfaces of the part. The upper end cap 3 and the lower end cap 4 are annular plate structures, installed on the inner and outer cylinders, and are used to wrap the upper and lower end surfaces of the part. The surface of the upper end cap 3 has an exhaust hole 15. The mold core 5 is annular, and a through hole 13 is formed on the side of the mold core 3 for accommodating the preform 9. One end face of the mold core 5 is installed on the lower positioning ring 8. The preform 9 is processed according to the shape and size of the part support plate, and is installed in the through hole on the side of the mold core. The lower positioning ring 8 is installed in the closed space formed by the inner cylinder 1, the outer cylinder 2, the upper end cap 3, and the lower end cap 4. The vent 15 is used for the introduction of high-pressure gas during the hot isostatic pressing process.

[0031] The side dimensions of mold core 5 are determined according to the part dimensions, with a margin of 0.1-0.5mm.

[0032] For example, the preform 9 is prepared by machining the block material according to the shape and size of the support plate of the part. The surface size of the preform 9 is determined according to the surface size of the support plate position in the part, and a margin of 0.1-0.5mm is reserved based on the surface size of the support plate position in the part.

[0033] It needs to be explained that the metal powder hot isostatic pressing technology has the advantages of casting and forging, and can realize near net shape forming of complex components. On the other hand, the metal powder alloy is highly dense, has no composition segregation, and has uniform and small structure, so that excellent mechanical properties can be obtained. The sleeve for hot isostatic pressing processing provided by the embodiment of the application provides a container for metal powder processing during the metal powder hot isostatic pressing processing. After the metal powder is introduced into the sleeve, the metal powder is densified by high-temperature and high-pressure processing. On the other hand, the preform 9 is pre-installed in the sleeve, and during the hot isostatic pressing forming process, the high-temperature diffusion connection between the preform and the metal powder is formed, so that the support plate in the part is formed.

[0034] In an optional embodiment, the inner cylinder 1, the outer cylinder 2, the upper end cover 3, the lower end cover 4, and the lower positioning ring 8 are made of carbon steel or stainless steel, the mold core 5 is made of carbon steel, and the preform 9 is made of titanium alloy, TiAl intermetallic compound, stainless steel, or nickel-based high-temperature alloy according to the material of the part to be formed.

[0035] Figure 3 A schematic view of a part processed by the sleeve for hot isostatic pressing processing provided by the embodiment of the application.

[0036] Reference Figure 3 In an embodiment, the inner cylinder 1 or the outer cylinder 2 is provided with a plurality of ribs 6 on the inner surface or the outer surface. Figure 3 On the basis of the inner ring surface 91 and the outer ring surface 92 of the part shown in the figure, the wall thickness is enlarged by n times and then increased by 2-5 mm, and n is 1-ρ, where ρ is the tap density of the part powder. Exemplarily, the wall thickness can be enlarged by 0.3-1 times and then increased by 2-5 mm.

[0037] In an embodiment, referring to Figure 1 The surface of the upper end cover 3 or the lower end cover 4 is formed with a flange 14. The flange 14 facilitates the installation of the upper end cover 3 or the lower end cover 4. Exemplarily, the height of the flange 14 can be 3-5 mm.

[0038] Figure 4 A schematic view of the assembly of the mold core and the preform provided by the embodiment of the application.

[0039] In an embodiment, referring to Figure 2 and Figure 4 The surface of the lower positioning ring 8 and the mold core 5 is formed with matching bosses or grooves, and the bosses or grooves cooperate to form a mortise and tenon structure for positioning and installing the mold core on the lower positioning ring 8.

[0040] Figure 5 A schematic view of the preform provided by the embodiment of the application.

[0041] In one embodiment, the first position 11 at the two ends of the preform 9 is determined according to the second position where the inner or outer annular surface 91 or 92 of the part meets the interface of the support plate, and the first position 11 extends outwardly from the second position by 0.1mm-0.5W, where W is the wall thickness of the inner or outer annular surface of the part. The purpose of extending the two ends of the preform 9 is to facilitate high-temperature diffusion bonding between the preform 9 and the metal powder during the hot isostatic pressing process.

[0042] Referring to Figure 5 In one embodiment, a fillet 12 is formed at the two ends of the preform 9, and the fillet 12 is used to position the preform 9 in the through hole 13 on the side surface of the mold core.

[0043] In one embodiment, referring to Figure 1 , 2 The inner cylinder 1, the outer cylinder 2, the upper end cover 3 and the lower end cover 4 form a closed space by welding, and the closed space is divided into an inner powder cavity 16 and an outer powder cavity 17 by the mold core. The inner powder cavity 16 and the outer powder cavity 17 are used to accommodate metal powder.

[0044] In one embodiment, referring to Figure 2 The sleeve further includes an upper positioning ring 6, and the other end surface of the mold core 5 is installed on the upper positioning ring 6. The upper positioning ring 6 and the lower positioning ring 8 position the mold core 5 based on the upper end cover 3 and the lower end cover 4, respectively. As shown in Figure 2 The upper positioning ring 6 abuts against the upper end cover 3, and the lower positioning ring 8 abuts against the lower end cover 4. The upper positioning ring 6 and the lower positioning ring 8 jointly position the mold core 5 in the closed space formed by the inner cylinder 1, the outer cylinder 2, the upper end cover 3 and the lower end cover 4.

[0045] Figure 6 A method flowchart for hot isostatic pressing according to an embodiment of the present application.

[0046] S101: Prepare a sleeve and fill it with metal powder.

[0047] In an optional embodiment, the material of the part to be processed is a TiAl alloy, and the size of the double-ring machine cartridge is an outer diameter of 540mm and a wall thickness of 1.5mm, and 16 support plates are uniformly distributed between the double rings.

[0048] In the preparation of the package, the inner cylinder or the outer cylinder is based on the inner and outer ring surface of the part, the wall thickness is enlarged by 0.5 times, and 2mm of machining allowance is added; the flanging height of the surface of the upper end cover or the lower end cover is 3mm; the side dimension of the mold core is reserved 0.1mm allowance based on the size of the part; the preform is processed according to the size of the part support plate, and 0.1mm allowance is reserved; the first position at both ends of the preform is extended outward by 0.1mm based on the second position, and the surface roughness of both ends of the preform is controlled within 3.2μm. The inner cylinder, the outer cylinder, the upper end cover, the lower end cover, and the lower positioning ring are made of carbon steel or stainless steel, the mold core is made of carbon steel, and the preform is made of forged TiAl alloy.

[0049] After the preparation of the package is completed, TiAl alloy powder is introduced into the package.

[0050] In another optional embodiment, the material of the part to be machined is Ti2AlNb alloy, and the size of the double-ring machine cartridge is 540mm in outer diameter and 1.5mm in wall thickness, and there are 16 support plates uniformly distributed between the double rings.

[0051] In the preparation of the package, the inner cylinder or the outer cylinder is based on the inner and outer ring surface of the part, the wall thickness is enlarged by 1 times, and 5mm of machining allowance is added; the flanging height of the surface of the upper end cover or the lower end cover is 5mm; the side dimension of the mold core is reserved 0.5mm allowance based on the size of the part; the preform is processed according to the size of the part support plate, and 0.5mm allowance is reserved; the first position at both ends of the preform is extended outward by 0.5mm based on the second position, and the surface roughness of both ends of the preform is controlled within 3.2μm. The inner cylinder, the outer cylinder, the upper end cover, the lower end cover, and the lower positioning ring are made of carbon steel or stainless steel, the mold core is made of carbon steel, and the preform is made of forged Ti2AlNb alloy.

[0052] After the preparation of the package is completed, Ti2AlNb alloy powder is introduced into the package.

[0053] S102: The package is subjected to hot isostatic pressing treatment.

[0054] Exemplarily, high-pressure inert gas or nitrogen is used as the pressure transmission medium, and under the joint action of high temperature and high pressure, the metal powder in the package is densified, and is diffusively connected and synthesized with the preform to form an integrated body.

[0055] S103: The inner cylinder, the outer cylinder, the upper end cover, the lower end cover, and the lower positioning ring of the package are removed. Specifically, they can be removed by mechanical machining.

[0056] S104: The mold core of the package is removed by chemical corrosion. Exemplarily, after the mold core is removed, the double-ring machine cartridge with thin-walled support plates is formed.

[0057] It should be understood that the above specific embodiments of the present application are merely used to illustrate or explain the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

[0058] The modules in the system device of the embodiments of the present application can be combined, divided, and deleted according to actual needs.

Claims

1. A can for hot isostatic pressing of a multi-ring structure can part, characterized in that, The package sleeve comprises an inner cylinder, an outer cylinder, an upper end cover, a lower end cover, a mold core, a lower positioning ring and a prefabricated body. The sizes of the inner cylinder and the outer cylinder are determined according to the outer shape size of the part, and are used to wrap the inner and outer annular surfaces of the part, wherein the wall thickness of the inner cylinder or the outer cylinder is enlarged by n times and then increased by 2-5 mm on the basis of the inner and outer annular surfaces of the part, and the value of n is 1-ρ, wherein ρ is the tap density of the part powder. The upper end cover and the lower end cover are annular plate structures, and are installed on the inner cylinder and the outer cylinder, and are used to wrap the upper and lower end surfaces of the part, and the surface of the upper end cover is formed with exhaust holes. The mold core is an annular body, and its shape is determined according to the shape of the part, and the side surface of the mold core is formed with a through hole, and the through hole is used to accommodate the prefabricated body. One end surface of the mold core is installed on the lower positioning ring, the prefabricated body is processed according to the shape and size of the part support plate, the prefabricated body is installed in the through hole of the side surface of the mold core, the first position at both ends of the prefabricated body is determined according to the second position of the intersection between the inner or outer annular surface of the part and the support plate, and the first position extends outward by 0.1mm-0.5W based on the second position, wherein W is the wall thickness of the inner or outer annular surface of the part. The package sleeve further comprises an upper positioning ring, and the other end surface of the mold core is installed on the upper positioning ring, and the upper and lower positioning rings are used to position the mold core based on the upper and lower end covers respectively. The lower positioning ring is installed in the closed space formed by the inner cylinder, the outer cylinder, the upper end cover and the lower end cover. The surface of the upper end cover or the lower end cover is formed with a flange.

2. The wrapper of claim 1, wherein, The lower positioning ring and the mold core are formed with matching bosses or grooves, and the bosses or grooves are matched to form a mortise and tenon structure, which is used to install and position the mold core on the lower positioning ring.

3. The wrapper of claim 1, wherein, The both ends of the prefabricated body are formed with round corners, which are used to limit the prefabricated body in the through hole of the side surface of the mold core.

4. The wrapper of claim 1, wherein The inner cylinder, the outer cylinder, the upper end cover and the lower end cover form a closed space by welding, and the closed space is divided into an inner powder cavity and an outer powder cavity by the mold core.

5. The wrapper of claim 1, wherein ​

Images