A sheathing structure for preparing a tubular shaft member of a fiber-reinforced metal matrix composite

Abstract

The present invention relates to the field of preparation of metal matrix composite structural parts, and specifically to a sheath structure for preparing fiber-reinforced metal matrix composite tube shaft parts. Precursor wires are laid on the outer surface of a tube shaft-shaped inner liner, and a precursor wire sheath is sleeved on the outer contour of the precursor wires, so that the tube shaft-shaped inner liner, the precursor wires, and the precursor wire sheath form a combined structure; this combined structure is arranged in the inner cavity of a tube shaft-shaped outer sleeve, and the outer conical surface of the sheath of the precursor wire sheath corresponds to and matches the inner conical surface of the inner cavity of the tube shaft-shaped outer sleeve. End encapsulation parts are installed at both ends of the tube shaft-shaped outer sleeve, and the end encapsulation parts are in close contact with and match the ends of the tube shaft-shaped inner liner, the precursor wire sheath, and the tube shaft-shaped outer sleeve respectively. The present invention can effectively solve the problems in the preparation process of current fiber-reinforced titanium matrix composite tube shaft parts, such as easy damage of composite precursor wires, low density of preforms, high fracture rate of reinforcing fibers, and poor dimensional control accuracy of tube shaft parts. This sheath structure is applicable to the preparation and forming of titanium matrix composite tube shaft parts.

Description

Technical Field

[0001] The present invention relates to the field of preparation of metal matrix composite structural parts, in particular to a sheath structure for preparing fiber reinforced metal matrix composite pipe shaft parts. The sheath structure is suitable for preparing and forming titanium matrix composite pipe shaft parts. Background Art

[0002] Metal-matrix composites, such as continuous SiC fiber-reinforced titanium-based composites, offer high specific strength, high specific stiffness, and excellent high-temperature resistance, creep resistance, and fatigue resistance, making them ideal high-temperature lightweight structural materials. Tubular and axial structural components fabricated from these materials have promising applications in aviation, aerospace, and deep-sea applications.

[0003] Tubular and axle-shaped structural components are typically manufactured using a precursor wire preform method. This method offers advantages such as unlimited matrix alloy type and composition, precise control of fiber volume fraction, and a certain degree of braiding properties, making it particularly suitable for the production of complex structural components such as tubular and axle-shaped components. The main process involves first applying a matrix alloy to the surface of SiC fibers using physical vapor deposition to form a composite precursor wire. This precursor wire is then braided and laid onto a preform casing using a winding machine. The preform's inner and outer casing components are then assembled and fixed. Finally, the structural component is densified and formed through high-temperature pressing.

[0004] During the production of tubular components, if the gap between the sheath and the preform is too large, the sheath will deform significantly during molding, making it difficult to control the dimensional accuracy of the tubular component and ensure fiber integrity. If the gap is too small, the friction coefficient between the precursor wire and the sheath increases, making assembly difficult and easily damaging the precursor wire. Therefore, the structural design and assembly accuracy of the preform sheath are important factors affecting component performance. Therefore, optimizing the sheath structure and reducing the void ratio between the precursor wire and the sheath are of great significance in improving the performance of fiber-reinforced titanium-based composite tubular components. Summary of the Invention

[0005] The purpose of the present invention is to provide a sheath structure for preparing fiber-reinforced metal-based composite pipe shaft parts, so as to solve the problem in the current preparation process of SiC fiber-reinforced titanium-based composite pipe shaft parts that the density of the composite preform is relatively low and the precursor wire is easily damaged and broken during the preform sheathing assembly process, thereby causing the performance of the composite pipe shaft parts to deteriorate.

[0006] The technical solution of the present invention is:

[0007] A sheathing structure for preparing a tube shaft part of a fiber-reinforced metal matrix composite material, which is composed of a tube shaft-shaped inner liner, a precursor wire sheath, a tube shaft-shaped outer sleeve and end encapsulation parts. The specific structure is as follows: The precursor wire is laid on the outer surface of the tube shaft-shaped inner liner, and the outer contour of the precursor wire is sleeved with a precursor wire sheath, so that the tube shaft-shaped inner liner, the precursor wire and the precursor wire sheath form a combined structure; This combined structure is arranged in the inner cavity of the tube shaft-shaped outer sleeve, and the outer conical surface of the sheath of the precursor wire sheath corresponds to and matches the inner conical surface of the inner cavity of the tube shaft-shaped outer sleeve. End encapsulation parts are installed at both ends of the tube shaft-shaped outer sleeve, and the end encapsulation parts are in close contact with and match the ends of the tube shaft-shaped inner liner, the precursor wire sheath and the tube shaft-shaped outer sleeve respectively.

[0008] In the sheathing structure for preparing a tube shaft part of a fiber-reinforced metal matrix composite material, the precursor wire is laid on the precursor wire laying surface of the tube shaft-shaped inner liner, and the inner liner positioning step A and the inner liner positioning step B with positioning step structures at both ends are respectively connected in cooperation with the end encapsulation parts.

[0009] In the sheathing structure for preparing a tube shaft part of a fiber-reinforced metal matrix composite material, the precursor wire sheath is an opening and closing structure of two or more bodies. The inner cavity of the sheath is the same size as the outer contour of the laid precursor wire, and it fixes and protects the precursor wire during the preform assembly and pressing forming processes. The outer conical surface of the sheath is inserted and matched with the inner cavity of the tube shaft part outer sleeve. The two ends of the precursor wire sheath have positioning structures and are connected in cooperation with the end encapsulation parts.

[0010] In the sheathing structure for preparing a tube shaft part of a fiber-reinforced metal matrix composite material, the inner conical surface of the tube shaft-shaped outer sleeve is the same in angle and size as the outer conical surface of the precursor wire sheath, and is inserted and matched with the closed precursor wire sheath to tightly fix the precursor wire. And the outer sleeve positioning groove A and the outer sleeve positioning groove B with positioning groove structures at both ends are connected in cooperation with the end encapsulation parts.

[0011] In the sheathing structure for preparing a tube shaft part of a fiber-reinforced metal matrix composite material, the end encapsulation part is an annular part with positioning groove and positioning step structures. The encapsulation part A and the encapsulation part B are respectively connected in cooperation with the two ends of the tube shaft-shaped inner liner, the precursor wire sheath and the tube shaft-shaped outer sleeve.

[0012] In the sheathing structure for preparing a tube shaft part of a fiber-reinforced metal matrix composite material, the tube shaft-shaped inner liner includes a precursor wire laying surface, an inner liner positioning step A and an inner liner positioning step B. The outer surface of the tube shaft-shaped inner liner is the precursor wire laying surface, and the precursor wire laying surface is the laying position of the precursor wire. The two ends of the precursor wire laying surface are respectively provided with the inner liner positioning step A and the inner liner positioning step B, and both the inner liner positioning step A and the inner liner positioning step B are cylindrical stepped structures;

[0013] The pioneer wire sheath has a split structure of two or more bodies with an outer conical surface on its outer contour. The pioneer wire sheath is sleeved around the pioneer wire laid on the pioneer wire laying surface through the inner bore of the sheath at its center. The inner bore of the sheath is a cylindrical hole structure, and its diameter is the same as the outer contour size of the pioneer wire after laying.

[0014] The tube-axis-shaped outer sleeve includes an inner conical surface, outer sleeve positioning groove A, and outer sleeve positioning groove B. The inner wall of the tube-axis-shaped outer sleeve is the inner conical surface, which corresponds to and matches the outer conical surface of the sheath. The angles and sizes of the inner conical surface and the outer conical surface of the sheath are the same. Outer sleeve positioning groove A and outer sleeve positioning groove B are respectively provided at both ends of the inner conical surface.

[0015] For the sheathing structure for preparing a fiber-reinforced metal matrix composite tube-axis part, the end encapsulation member includes encapsulation member A and encapsulation member B which are oppositely arranged. Encapsulation member A and encapsulation member B are annular members with a positioning groove and a positioning step structure, where:

[0016] The central hole of encapsulation member A is encapsulation positioning groove A, which is a cylindrical stepped structure and corresponds to and matches the inner lining positioning step A of the tube-axis-shaped inner lining; an encapsulation positioning step A is provided on the outer periphery of encapsulation member A, which is a cylindrical stepped structure and corresponds to and matches the outer sleeve positioning groove A of the tube-axis-shaped outer sleeve; the central hole of encapsulation member B is encapsulation positioning groove B, which is a cylindrical stepped structure and corresponds to and matches the inner lining positioning step B of the tube-axis-shaped inner lining; an encapsulation positioning step B is provided on the outer periphery of encapsulation member B, which is a cylindrical stepped structure and corresponds to and matches the outer sleeve positioning groove B of the tube-axis-shaped outer sleeve; the inner end faces of encapsulation member A and encapsulation member B respectively correspond to and are in close contact with the two end faces of the pioneer wire sheath.

[0017] For the sheathing structure for preparing a fiber-reinforced metal matrix composite tube-axis part, its usage method is as follows:

[0018] Step A: Lay the pioneer wire on the pioneer wire laying surface of the tube-axis-shaped inner lining.

[0019] Step B: Buckle the inner bore of the pioneer wire sheath onto the pioneer wire for fixed protection.

[0020] Step C: Insert and fit the outer conical surface of the sheath with the outer sleeve of the tube-axis part.

[0021] Step D: Connect encapsulation member A and encapsulation member B in the end encapsulation member with the tube-axis-shaped inner lining, the pioneer wire sheath, and the tube-axis-shaped outer sleeve respectively, and the sheathing assembly of the fiber-reinforced titanium matrix composite tube-axis part is completed.

[0022] The design concept of the present invention:

[0023] According to the design rules of the composite material tube shaft structural part sheath and combined with the performance characteristics of the composite material precursor wire, a two-body or multi-body sheath with an opening and closing structure is used to protect the precursor wire, preventing the precursor wire from being damaged and broken during the assembly process. Then, a tube shaft-shaped outer sleeve with an inner bore taper identical to the outer taper surface of the precursor wire sheath is inserted and fitted to tightly fix the precursor wire. Finally, through the positioning structures at both ends of the inner liner, the sheath, and the outer sleeve, a tight fit connection is made with the end encapsulation part, which not only ensures the integrity rate of the precursor wire but also improves the density of the composite material preform.

[0024] Advantages and beneficial effects of the present invention:

[0025] 1. In the present invention, a two-body or multi-body sheath with an opening and closing structure is used to protect the precursor wire, avoiding damage and breakage of the precursor wire during the assembly process, ensuring the integrity rate of the precursor wire, and effectively improving the performance of the finished structural part.

[0026] 2. In the present invention, the conical surface insertion structure and the positioning card slot structure are used to closely and precisely match the various components of the preform sheath, greatly improving the density of the precursor wire and the preform sheath assembly preform, thereby improving the performance of the finished structural part.

[0027] 3. The preform sheath structure in the present invention is simple, which is conducive to processing and preparation as well as subsequent fine assembly. Brief Description of the Drawings

[0028] Figure 1 It is the sectional view of the sheath structure and assembly involved in the present invention.

[0029] Figure 2 It is the sectional view of the tube shaft-shaped inner liner involved in the present invention.

[0030] Figure 3 It is the sectional view and side view of the precursor wire sheath involved in the present invention, where: (a) is the sectional view, and (b) is the side view.

[0031] Figure 4 It is the sectional view of the tube shaft-shaped outer sleeve involved in the present invention.

[0032] Figure 5 It is the sectional view of the end encapsulation part involved in the present invention.

[0033] Figure 6 It is the schematic diagram of the sheath assembly involved in the present invention.

[0034] Figures 1 to 6Chinese: 1. Tube-shaped inner liner; 1.1. Precursor wire laying surface; 1.2. Inner liner positioning step A; 1.3. Inner liner positioning step B; 2. Precursor wire sheath; 2.1. Sheath inner cavity; 2.2. Sheath outer conical surface; 3. Tube-shaped outer sleeve; 3.1. Inner cavity conical surface; 3.2. Outer sleeve positioning groove A; 3.3. Outer sleeve positioning groove B; 4. End encapsulation part; 4.1. Encapsulation part A; 4.2. Encapsulation part B; 4.3. Encapsulation positioning groove A; 4.4. Encapsulation positioning step A; 4.5. Encapsulation positioning groove B; 4.6. Encapsulation positioning step B; 5. Precursor wire. Detailed implementation mode

[0035] For clear and accurate description, the present invention will be described below with reference to the accompanying drawings.

[0036] As Figures 1 - 6 shown, the present invention provides a sheathing structure for preparing a fiber-reinforced metal matrix composite tube shaft part, which is composed of a tube-shaped inner liner 1, a precursor wire sheath 2, a tube-shaped outer sleeve 3 and an end encapsulation part 4. The specific structure is as follows:

[0037] The precursor wire 5 is laid on the outer surface of the tube-shaped inner liner 1, and the outer contour of the precursor wire 5 is sleeved with the precursor wire sheath 2, so that the tube-shaped inner liner 1, the precursor wire 5 and the precursor wire sheath 2 form a combined structure; this combined structure is arranged in the inner cavity of the tube-shaped outer sleeve 3, and the sheath outer conical surface 2.2 of the precursor wire sheath 2 corresponds to and matches the inner cavity conical surface 3.1 of the tube-shaped outer sleeve 3. The end encapsulation parts 4 are installed at both ends of the tube-shaped outer sleeve 3, and the end encapsulation parts 4 are in close contact with and match the ends of the tube-shaped inner liner 1, the precursor wire sheath 2 and the tube-shaped outer sleeve 3 respectively.

[0038] The tube-shaped inner liner 1 includes a precursor wire laying surface 1.1, an inner liner positioning step A 1.2 and an inner liner positioning step B 1.3. The outer surface of the tube-shaped inner liner 1 is the precursor wire laying surface 1.1, and the precursor wire laying surface 1.1 is the laying position of the precursor wire 5. Inner liner positioning steps A 1.2 and B 1.3 are respectively arranged at both ends of the precursor wire laying surface 1.1, and both the inner liner positioning step A 1.2 and the inner liner positioning step B 1.3 are cylindrical stepped structures;

[0039] The precursor wire sheath 2 is a split structure of two or more bodies with a sheath outer conical surface 2.2 on its outer contour. The precursor wire sheath 2 is sleeved around the precursor wire 5 laid on the precursor wire laying surface 1.1 through the sheath inner cavity 2.1 in its center. The sheath inner cavity 2.1 is a cylindrical hole structure, and its diameter is the same as the outer contour size of the laid precursor wire 5;

[0040] The tube-shaped outer sleeve 3 includes an inner bore conical surface 3.1, an outer sleeve positioning groove A 3.2, and an outer sleeve positioning groove B 3.3. The inner wall of the tube-shaped outer sleeve 3 is the inner bore conical surface 3.1, which corresponds to and matches the outer conical surface 2.2 of the sheath. The angles and dimensions of the inner bore conical surface 3.1 and the outer conical surface 2.2 of the sheath are the same. The two ends of the inner bore conical surface 3.1 are respectively provided with the outer sleeve positioning groove A 3.2 and the outer sleeve positioning groove B 3.3;

[0041] The end encapsulation member 4 includes an encapsulation member A 4.1 and an encapsulation member B 4.2 that are oppositely arranged. The encapsulation member A 4.1 and the encapsulation member B 4.2 are annular members with a positioning groove and a positioning step structure. Among them: the central hole of the encapsulation member A 4.1 is the encapsulation positioning groove A 4.3, and the encapsulation positioning groove A 4.3 is a cylindrical stepped structure, which corresponds to and matches the inner lining positioning step A 1.2 of the tube-shaped inner lining 1; the outer periphery of the encapsulation member A 4.1 is provided with an encapsulation positioning step A 4.4, and the encapsulation positioning step A 4.4 is a cylindrical stepped structure, which corresponds to and matches the outer sleeve positioning groove A 3.2 of the tube-shaped outer sleeve 3. The central hole of the encapsulation member B 4.2 is the encapsulation positioning groove B 4.5, and the encapsulation positioning groove B 4.5 is a cylindrical stepped structure, which corresponds to and matches the inner lining positioning step B 1.3 of the tube-shaped inner lining 1; the outer periphery of the encapsulation member B 4.2 is provided with an encapsulation positioning step B 4.6, and the encapsulation positioning step B 4.6 is a cylindrical stepped structure, which corresponds to and matches the outer sleeve positioning groove B 3.3 of the tube-shaped outer sleeve 3. In addition, the inner end faces of the encapsulation member A 4.1 and the encapsulation member B 4.2 respectively correspond to and are in close contact with the two end faces of the precursor wire sheath 2.

[0042] The structural functions of each part are as follows:

[0043] 1. The tube-shaped inner lining 1

[0044] As Figure 1 , Figure 2 shown, the precursor wire laying surface 1.1 of the tube-shaped inner lining 1 is used for laying the precursor wire 5, and has inner lining positioning steps A 1.2 and inner lining positioning steps B 1.3 with a positioning step structure at both ends, which are respectively connected in cooperation with the end encapsulation member 4.

[0045] 2. The precursor wire sheath 2

[0046] As Figure 1 , Figure 3 shown, the precursor wire sheath 2 is an opening and closing structure of two or more bodies. The inner cavity 2.1 of the sheath is the same as the outer contour dimension of the laid precursor wire 5, and is used for fixing and protecting the precursor wire 5 during the preform assembly and compression molding processes. The outer conical surface 2.2 of the sheath is inserted and matched with the inner bore of the tube shaft member 3. The two ends of the precursor wire sheath 2 have a positioning structure and are connected in cooperation with the end encapsulation member 4.

[0047] 3. Tube-shaped outer sleeve 3

[0048] As Figure 1 , Figure 4 shown, the inner conical surface 3.1 of the tube-shaped outer sleeve 3 is consistent with the outer conical surface 2.2 of the precursor wire sheath in terms of angle and size. When inserted and fitted with the closed precursor wire sheath 2, the precursor wire 5 can be tightly fixed. Moreover, there are outer sleeve positioning grooves A 3.2 and outer sleeve positioning grooves B 3.3 with positioning groove structures at both ends, which are connected and fitted with the end encapsulation part 4.

[0049] 4. End encapsulation part 4

[0050] As Figure 1 , Figure 5 shown, the end encapsulation part 4 is an annular part with positioning groove and positioning step structures. Encapsulation part A 4.1 and encapsulation part B 4.2 are respectively connected and fitted with both ends of the tube-shaped inner liner 1, the precursor wire sheath 2, and the tube-shaped outer sleeve 3.

[0051] As Figures 1 - 6 shown, the sheathing structure of the present invention for preparing the tube shaft part of the SiC fiber reinforced titanium matrix composite material has the following usage method:

[0052] Step A: Lay the precursor wire 5 on the precursor wire laying surface 1.1 of the tube-shaped inner liner 1;

[0053] Step B: Fasten the inner cavity 2.1 of the precursor wire sheath 2 onto the precursor wire 5 for fixed protection;

[0054] Step C: Insert and fit the outer conical surface 2.2 of the sheath with the tube shaft part outer sleeve 3;

[0055] Step D: Respectively connect and fit encapsulation part A 4.1 and encapsulation part B 4.2 in the end encapsulation part 4 with the tube-shaped inner liner 1 (inner liner positioning steps A 1.2 and inner liner positioning steps B 1.3), the precursor wire sheath 2, and the tube-shaped outer sleeve 3 (outer sleeve positioning grooves A 3.2 and outer sleeve positioning grooves B 3.3).

[0056] So far, the sheathing assembly of the fiber reinforced titanium matrix composite material tube shaft part is completed.

[0057] The implementation results show that the present invention uses a two-piece or multi-piece sheath with an opening and closing structure to protect the composite material precursor wire, and uses a conical surface insertion structure and a positioning card slot structure to closely fit the various components of the preform sheath, which can effectively solve the problems in the preparation process of the current fiber reinforced titanium matrix composite material tube shaft part, such as easy damage of the composite material precursor wire, low density of the preform, high fracture rate of the reinforcing fiber, and poor dimensional control accuracy of the tube shaft part.

Claims

1. A sheathing structure for preparing a fiber-reinforced metal matrix composite tube shaft member, characterized in that, It is composed of a tubular shaft-shaped inner liner, a precursor wire sheath, a tubular shaft-shaped outer sheath, and end encapsulation components. The specific structure is as follows: The precursor wire is laid on the outer surface of the tubular shaft-shaped inner liner, and the outer contour of the precursor wire is sleeved with the precursor wire sheath, so that the tubular shaft-shaped inner liner, the precursor wire, and the precursor wire sheath form a combined structure; this combined structure is arranged in the inner cavity of the tubular shaft-shaped outer sheath, and the outer conical surface of the sheath of the precursor wire sheath corresponds to and matches the inner conical surface of the inner cavity of the tubular shaft-shaped outer sheath. The end encapsulation components are installed at both ends of the tubular shaft-shaped outer sheath, and the end encapsulation components are in close contact with and match the ends of the tubular shaft-shaped inner liner, the precursor wire sheath, and the tubular shaft-shaped outer sheath respectively; The precursor wire sheath is an openable structure of two or more parts. The inner cavity of the sheath is the same size as the outer contour of the laid precursor wire, which fixes and protects the precursor wire during the preform assembly and compression molding process. The outer conical surface of the sheath is inserted and matched with the inner cavity of the tubular shaft part outer sheath. Both ends of the precursor wire sheath have positioning structures, which are connected with the end encapsulation components in a matching manner.

2. The sheathing structure for preparing the tubular shaft member of the fiber-reinforced metal matrix composite material according to claim 1, characterized in that, The precursor wire is laid on the precursor wire laying surface of the tubular shaft-shaped inner liner, and both ends have an inner liner positioning step A and an inner liner positioning step B with positioning step structures, which are respectively connected with the end encapsulation components in a matching manner.

3. The sheathing structure for preparing a fiber-reinforced metal matrix composite tube shaft member according to claim 1, wherein The inner conical surface of the tubular shaft-shaped outer sheath is the same in angle and size as the outer conical surface of the precursor wire sheath, and is inserted and matched with the closed precursor wire sheath to tightly fix the precursor wire. Both ends have an outer sheath positioning groove A and an outer sheath positioning groove B with positioning groove structures, which are connected with the end encapsulation components in a matching manner.

4. The sheathing structure for preparing a fiber-reinforced metal matrix composite pipe shaft member according to claim 1, characterized in that, The end encapsulation component is an annular part with positioning groove and positioning step structures. Encapsulation component A and encapsulation component B are respectively connected with both ends of the tubular shaft-shaped inner liner, the precursor wire sheath, and the tubular shaft-shaped outer sheath in a matching manner.

5. The sheathing structure for preparing a fiber-reinforced metal matrix composite tube shaft member according to claim 1, characterized in that, The tubular shaft-shaped inner liner includes a precursor wire laying surface, an inner liner positioning step A, and an inner liner positioning step B. The outer surface of the tubular shaft-shaped inner liner is the precursor wire laying surface, which is the laying position of the precursor wire. Both ends of the precursor wire laying surface are respectively provided with an inner liner positioning step A and an inner liner positioning step B. Both the inner liner positioning step A and the inner liner positioning step B are cylindrical stepped structures; The precursor wire sheath is an openable structure of two or more parts with an outer contour having an outer conical surface of the sheath. The precursor wire sheath is sleeved on the periphery of the precursor wire laid on the precursor wire laying surface through the inner cavity of the sheath at its center. The inner cavity of the sheath is a cylindrical hole structure, and its diameter is the same as the outer contour size of the laid precursor wire; The tubular shaft-shaped outer sheath includes an inner conical surface, an outer sheath positioning groove A, and an outer sheath positioning groove B. The inner wall of the tubular shaft-shaped outer sheath is the inner conical surface, which corresponds to and matches the outer conical surface of the sheath. The angle and size of the inner conical surface are the same as those of the outer conical surface of the sheath. Both ends of the inner conical surface are respectively provided with an outer sheath positioning groove A and an outer sheath positioning groove B.

6. The sheathing structure for preparing a fiber-reinforced metal matrix composite tube shaft member according to claim 5, characterized in that, The end encapsulation component includes encapsulation component A and encapsulation component B arranged opposite to each other. Encapsulation component A and encapsulation component B are annular parts with positioning groove and positioning step structures, where: The central hole of the encapsulation part A is the encapsulation positioning groove A, and the encapsulation positioning groove A is a cylindrical stepped structure, which corresponds to and matches the inner lining positioning step A of the tube-shaped inner lining; the outer periphery of the encapsulation part A is provided with an encapsulation positioning step A, and the encapsulation positioning step A is a cylindrical stepped structure, which corresponds to and matches the outer sleeve positioning groove A of the tube-shaped outer sleeve; the central hole of the encapsulation part B is the encapsulation positioning groove B, and the encapsulation positioning groove B is a cylindrical stepped structure, which corresponds to and matches the inner lining positioning step B of the tube-shaped inner lining; the outer periphery of the encapsulation part B is provided with an encapsulation positioning step B, and the encapsulation positioning step B is a cylindrical stepped structure, which corresponds to and matches the outer sleeve positioning groove B of the tube-shaped outer sleeve; the inner end faces of the encapsulation part A and the encapsulation part B respectively correspond to and are in close contact with the two end faces of the precursor wire sheath.

7. The sheathing structure for preparing a fiber-reinforced metal matrix composite tube shaft member according to any one of claims 1 to 6, characterized in that, The usage method is as follows: Step A: Lay the precursor wire on the precursor wire laying surface of the tube-shaped inner lining; Step B: Fasten the inner cavity of the sheath of the precursor wire sheath onto the precursor wire for fixed protection; Step C: Insert and fit the outer conical surface of the sheath with the tube-shaped outer sleeve; Step D: Connect the encapsulation part A and the encapsulation part B in the end encapsulation part with the tube-shaped inner lining, the precursor wire sheath and the tube-shaped outer sleeve respectively in a matching manner, and the sheathing assembly of the fiber-reinforced titanium matrix composite material tube shaft part is completed.

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