CN216179918U - Cold extrusion clamp for holes - Google Patents

Abstract

The utility model belongs to the technical field of cold extrusion processing, and discloses a cold extrusion clamp for holes, which comprises a supporting unit and a core rod, wherein the supporting unit comprises a fixed frame assembly and a bushing, the fixed frame assembly is used for being fixed with an external frame body, the bushing is fixedly arranged on the fixed frame assembly, one end of the bushing is provided with an extrusion part, and the extrusion part is used for penetrating through an assembly hole of a structural member; the mandrel penetrates through and is connected to the bushing in a sliding mode, one end of the mandrel is used for being connected with the external driving assembly, the other end of the mandrel is provided with a working ring, the outer diameter of the working ring is larger than the inner diameter of the extrusion part, and the working ring can penetrate through the extrusion part; when the mandrel is in the first state, the working ring is positioned outside the bushing, and when the mandrel is in the second state, the working ring penetrates through the extrusion part, and the external driving assembly can drive the mandrel to move, so that the first state and the second state are mutually switched. The cold extrusion clamp for the hole is simple in structure and convenient and fast to operate, and can improve the surface quality of the hole wall of the assembling hole of the structural member and increase the fatigue gain strengthening effect of the structural member with the hole.

Description

Cold extrusion clamp for holes

Technical Field

The utility model relates to the technical field of cold extrusion processing, in particular to a cold extrusion clamp for holes.

Background

With the rapid development of aviation industry, materials such as carbon fiber reinforced composite materials, titanium alloys, aluminum alloys, nickel-based superalloys and the like are widely applied to aircraft structures, and the processing and assembly of the materials are emphasized in the aircraft manufacturing process. In the aircraft structure spare assembling process, assemble the aircraft structure spare through installing fastening part in the pilot hole, because the existence of pilot hole on the structure spare, the pilot hole limit easily forms stress concentration, arouses the hole limit to produce fatigue crack initiation, accelerates fatigue crack propagation rate, reduces aircraft structure spare life, consequently needs to strengthen the pilot hole to the structure spare.

The airplane structural member strengthening technology is characterized in that local strengthening treatment is carried out on a structural member assembling hole on the premise of not increasing the weight of a structural member and changing the form and material of the structural member, so that the fatigue performance of the airplane structural member is improved, the service life of the airplane structural member is prolonged, and the airplane structural member strengthening technology is an important technical means for realizing the long service life, high reliability and low maintenance cost of a modern airplane.

The hole cold extrusion strengthening technology adopts a conical core rod with the diameter larger than that of the assembly hole to carry out extrusion strengthening on the hole wall of the assembly hole, the hole wall is subjected to plastic deformation in the hole extrusion strengthening process, and the hole wall of the assembly hole forms a residual compressive stress field in a certain range. The residual compressive stress field can offset the tensile stress generated by external alternating load, reduce the stress concentration generated by the hole edge of the assembly hole, prevent fatigue cracks from generating, and delay the fatigue crack propagation rate, thereby improving the fatigue performance of the porous structural member and prolonging the service life of the porous structural member. The hole cold extrusion strengthening technology has the characteristics of simple process, remarkable strengthening effect and the like, and is widely applied to the anti-fatigue strengthening of the pilot hole of the main bearing structural member of the airplane. The common hole cold extrusion strengthening equipment is portable drawing type extrusion equipment produced by FTI and a process system thereof, and the equipment has the problems of complex structure, high price, limited adjustable parameter range and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cold extrusion clamp for holes, which is simple in structure and convenient and fast to operate, and can improve the surface quality of the wall of an assembling hole of a structural member and increase the fatigue gain strengthening effect of the structural member with holes.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a cold extrusion fixture for apertures, comprising:

the supporting unit comprises a fixing frame assembly used for being fixed with an external frame body and a bushing fixedly arranged on the fixing frame assembly, wherein one end of the bushing is provided with a pressing part, and the pressing part is used for penetrating through an assembling hole of a structural part;

the mandrel penetrates through and is connected to the bushing in a sliding mode, one end of the mandrel is used for being connected with an external driving assembly, the other end of the mandrel is provided with a working ring, the outer diameter of the working ring is larger than the inner diameter of the extrusion part, and the working ring can penetrate through the extrusion part;

in the first state, the working ring is positioned outside the bushing, and in the second state, the working ring penetrates through the extrusion part; the external driving assembly can drive the core rod to move, so that the first state and the second state are mutually switched.

Optionally, the mount subassembly includes first mounting panel, second mounting panel and connect in first mounting panel with stand between the second mounting panel, first mounting panel with form the accommodation space between the second mounting panel, the bush fixed set up in first mounting panel just set up in the accommodation space, the one end that the plug is used for being connected with external drive subassembly set up in the accommodation space is outside.

Optionally, the first mounting plate is provided with a through hole, and the upright post passes through the through hole and is connected with a first nut;

first ladder hole has been seted up to the second mounting panel, first ladder hole includes unthreaded hole and screw hole, the stand passes the unthreaded hole connect in the screw hole.

Optionally, a first connecting assembly is arranged on the second mounting plate, and the first connecting assembly is connected to the outer frame body through a fastener;

one end of the core rod is connected with a second connecting assembly, the second connecting assembly is connected with the external driving assembly through a fastener, and the second connecting assembly is arranged outside the accommodating space.

Optionally, the first connecting assembly includes a first connecting element, a second nut and a first fixing ring, the second mounting plate is provided with a central hole, the first connecting element passes through the central hole and extends into the accommodating space, one end of the first connecting element extending into the accommodating space is in threaded connection with the second nut, the first fixing ring is sleeved at the middle position of the first connecting element, and the second nut and the first fixing ring are abutted against two sides of the second mounting plate;

the second connecting assembly comprises a second connecting element and a second fixing ring, the mandrel is in threaded connection with one end of the second connecting element, the other end of the second connecting element is used for being connected with the external driving assembly, and the second fixing ring is arranged on the periphery of the second connecting element and can be abutted to the external driving assembly.

Optionally, the first connecting element has a first pin hole radially opened, and the second connecting element has a second pin hole radially opened.

Optionally, two pairs of hook plate grooves are symmetrically formed in the peripheries of the first fixing ring and the second fixing ring.

Optionally, a second stepped hole is formed in the first mounting plate, the second stepped hole includes an unthreaded hole and a threaded hole, the supporting unit further includes a sleeve, one end of the sleeve penetrates the unthreaded hole and is in threaded connection with the threaded hole, the other end of the sleeve is connected with a connecting portion of one end of the bushing, which deviates from the extrusion portion, and the mandrel penetrates the sleeve and the bushing.

Optionally, the pressing portion further includes an intermediate portion disposed between the pressing portion and the connecting portion, an outer diameter of the intermediate portion is larger than an outer diameter of the pressing portion, and an auxiliary plate is sleeved on the pressing portion and can abut against an end portion of the intermediate portion facing the pressing portion.

Optionally, the pressing portion is opened along an extending direction thereof.

The utility model has the beneficial effects that:

according to the cold extrusion clamp for the hole, the movement of the core rod is controlled, and the working ring can enable the bushing to expand radially outwards, so that the extrusion strengthening of the hole wall of the assembling hole is realized, the surface quality of the hole wall of the assembling hole of the structural member is improved, and the fatigue gain strengthening effect of the structural member with the hole is improved; the supporting unit enables the structure to be stably installed, the external driving assembly drives the core rod to slide along the lining, the structure of the core rod and the supporting unit is relatively stable, the structure is simple and reliable, and the operation is convenient and fast.

Drawings

FIG. 1 is a schematic structural diagram of a cold extrusion fixture for holes provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first mounting plate provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic structural view of a second mounting plate provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a column according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a first connecting element provided in accordance with an embodiment of the present invention;

FIG. 6 is a longitudinal cross-sectional view of a second connecting element provided in accordance with an embodiment of the present invention;

FIG. 7 is a schematic view of a second retaining ring according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view A-A of FIG. 7;

FIG. 9 is a schematic diagram of a bushing provided in accordance with an embodiment of the present invention;

fig. 10 is a schematic structural view of a mandrel according to an embodiment of the present invention.

In the figure:

100. a structural member;

1. a support unit; 111. a first mounting plate; 1111. a through hole; 1112. a second stepped bore; 112. a second mounting plate; 1121. a first stepped hole; 1122. a central bore; 113. a column; 1131. disassembling the groove; 114. a first nut; 12. a bushing; 121. a pressing section; 1211. an opening; 122. a connecting portion; 123. an intermediate portion; 131. a first connecting element; 1311. a first card slot; 1312. a first pin hole; 1313. a first blocking portion; 132. a second nut; 133. a first retaining ring; 14. a sleeve; 15. an auxiliary plate; 1A, an accommodating space;

2. a core rod; 21. a working ring; 22. a second blocking portion;

3. a second connection assembly; 31. a second connecting element; 311. a second pin hole; 32. a second retaining ring; 321. a hook plate groove.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The embodiment provides a cold extrusion jig for holes, which comprises a supporting unit 1 and a core rod 2 as shown in fig. 1; specifically, the supporting unit 1 comprises a fixing frame assembly for fixing with an external frame body, and a bushing 12 fixedly arranged on the fixing frame assembly, wherein one end of the bushing 12 is provided with a pressing part 121, and the pressing part 121 is used for penetrating through an assembly hole of the structural member 100; the mandrel 2 passes through and is connected with the bushing 12 in a sliding mode, one end of the mandrel 2 is used for being connected with an external driving assembly, the other end of the mandrel 2 is provided with a working ring 21, the outer diameter of the working ring 21 is larger than the inner diameter of the extrusion part 121, and the working ring 21 can pass through the extrusion part 121; in the first state, the working ring 21 is located outside the liner 12, and in the second state, the working ring 21 passes through the extrusion section 121, and the external driving unit can drive the mandrel bar 2 to move, so that the first state and the second state are switched.

In the first state, the working ring 21 is located outside the bushing 12, and the structural member 100 is sleeved on the pressing portion 121 of the bushing 12 through the assembling hole; then the external driving component drives the core rod 2 to move, so that the first state is switched to the second state; in the second state, the working ring 21 passes through the pressing portion 121, and since the outer diameter of the working ring 21 is larger than the inner diameter of the pressing portion 121, the working ring 21 can expand the pressing portion 121 radially outward, so that the working ring 21 presses the assembly hole through the pressing portion 121, thereby realizing the extrusion strengthening of the hole wall of the assembly hole.

By controlling the movement of the core rod 2 and enabling the working ring 21 to enable the bushing 12 to expand radially outwards, the extrusion strengthening of the hole wall of the assembly hole is realized, the surface quality of the hole wall of the assembly hole of the structural member 100 is improved, and the fatigue gain strengthening effect of the structural member 100 with the hole is increased; the supporting unit 1 enables the structure to be stably installed, the external driving assembly drives the core rod 2 to slide along the lining 12, the structure of the core rod 2 and the structure of the supporting unit 1 are relatively stable, the structure is simple and reliable, and the operation is convenient and fast.

Specifically, the cold extrusion jig for holes can be connected to a microcomputer-controlled electronic universal testing machine, the supporting unit 1 is fixed to the microcomputer-controlled electronic universal testing machine, and the core rod 2 is connected to a moving device of the microcomputer-controlled electronic universal testing machine.

Optionally, as shown in fig. 1, the fixing frame assembly includes a first mounting plate 111, a second mounting plate 112, and a column 113 connected between the first mounting plate 111 and the second mounting plate 112, an accommodating space 1A is formed between the first mounting plate 111 and the second mounting plate 112, the bushing 12 is fixedly disposed on the first mounting plate 111 and disposed in the accommodating space 1A, one end of the mandrel 2 for being connected with the external driving assembly is disposed outside the accommodating space 1A, so as to facilitate connection between the external driving assembly and the mandrel 2, and the working ring 21 and the bushing 12 are disposed in the accommodating space 1A, and the first mounting plate 111 and the second mounting plate 112 can play a role in protection. In this embodiment, two columns 113 are provided, and the two columns 113 are symmetrically disposed on both sides of the bushing 12.

Optionally, as shown in fig. 2, a through hole 1111 is formed in the first mounting plate 111, the upright 113 penetrates through the through hole 1111 and is connected to the first nut 114, and the upright 113 has a guiding function when penetrating through the through hole 1111, so as to prevent the first mounting plate 111 and the upright 113 from deflecting during the assembly process, further prevent the assembling hole from being eccentric during the extrusion strengthening process, and improve the product quality.

Similarly, optionally, as shown in fig. 3, the second mounting plate 112 is provided with a first stepped hole 1121, the first stepped hole 1121 includes an unthreaded hole and a threaded hole, the pillar 113 passes through the unthreaded hole and is connected to the threaded hole, and the pillar 113 has a guiding function when passing through the unthreaded hole, so that the second mounting plate 112 and the pillar 113 are prevented from deflecting during the assembling process, and eccentricity is prevented from occurring during the extrusion strengthening process.

Correspondingly, both ends of the upright 113 are provided with external threads to connect with the first nut 114 and the first stepped hole 1121, respectively; specifically, two ends of the upright post 113 near the external threads are respectively provided with a section of stepped shaft, and the stepped shafts at the two ends are respectively connected with the unthreaded hole and the through hole 1111. Further alternatively, as shown in fig. 4, the upright 113 is provided with left and right detaching grooves 1131, so that an external operating tool such as a nipper can grip the upright 113 through the holding detaching grooves 1131.

Optionally, as shown in fig. 1, a first connecting assembly is disposed on the second mounting plate 112, and the first connecting assembly is connected to the external frame body through a fastener and is connected to the external frame body through the first connecting assembly and the fastener, respectively, so as to prevent the second mounting plate 112 from being directly connected to the external frame body, and the structure of the second mounting plate 112 is affected after multiple times of assembly and disassembly, thereby improving the reliability of the supporting unit 1; in the same way, optionally, one end of the mandrel 2 is connected with a second connecting assembly 3, the second connecting assembly 3 is connected to an external driving assembly through a fastener, the mandrel 2 is prevented from being directly connected with the external driving assembly through the second connecting assembly 3, the structure of the mandrel 2 is influenced after the mandrel 2 is disassembled and assembled for many times, the reliability of the mandrel 2 is improved, the matching reliability of the supporting unit 1 and the mandrel 2 is improved, and the extrusion strengthening quality of the mounting hole of the structural member 100 is improved. Specifically, the second connecting assembly 3 is disposed outside the accommodating space 1A, so as to be connected to an external driving assembly.

Alternatively, as shown in fig. 1 and 5, the first connection assembly includes a first connection element 131, a second nut 132 and a first fixing ring 133, the second mounting plate 112 is provided with a central hole 1122, the first connection element 131 passes through the central hole 1122 and extends into the accommodating space 1A, and the first connection element 131 and the second mounting plate 112 are prevented from deflecting by the guiding function of the first connection element 131 and the central hole 1122, so that the second mounting plate 112 and the external bracket are prevented from deflecting; one end of the first connecting element 131 extending into the accommodating space 1A is in threaded connection with the second nut 132, the first fixing ring 133 is sleeved at the middle position of the first connecting element 131, and the second nut 132 and the fixing ring are abutted against the two sides of the second mounting plate 112, so that the first connecting element 131 is stably connected with the second mounting plate 112, axial movement or looseness is prevented, and a cold extrusion strengthening effect of the mounting hole of the structural member 100 is ensured. Specifically, the first connection element 131 is provided with a first locking groove 1311, the first fixing ring is locked to the first locking groove 1311 to prevent the first fixing ring 133 from moving along the axial direction of the first connection element 131, one side of the first locking groove 1311 is provided with a first blocking portion 1313, the first blocking portion 1313 blocks the first fixing ring 133, and the first fixing ring 133 is further prevented from moving along the axial direction. Optionally, the first connecting element 131 has a first pin hole 1312 radially opened and fixed to the outer frame body by a positioning pin.

Likewise, optionally, as shown in fig. 1, 5 and 6, the second connecting assembly 3 includes a second connecting element 31 and a second fixing ring 32, the second connecting element 31 is disposed outside the accommodating space 1A, the mandrel 2 is in threaded connection with one end of the second connecting element 31, the other end of the second connecting element 31 is used for being connected with an external driving assembly, and the second fixing ring 32 is disposed on the periphery of the second connecting element 31 and can abut against the external driving assembly, so as to prevent the external driving assembly from moving axially with the second connecting element 31, thereby ensuring the cold extrusion strengthening effect of the mounting hole of the structural member 100. Similarly, optionally, the second connecting element 31 is provided with a second pin hole 311 along the radial direction, and is fixed with the external driving assembly by a positioning pin.

Alternatively, as shown in fig. 7 and 8, two pairs of hook plate grooves 321 are symmetrically formed on the outer peripheries of the first fixing ring 133 and the second fixing ring 32, respectively, so that the fixing rings can be fastened conveniently through the hook plate grooves 321.

Optionally, as shown in fig. 1, 2 and 9, the first mounting plate 111 is provided with a second stepped hole 1112, the second stepped hole 1112 comprises an optical hole and a threaded hole, the support unit 1 further comprises a sleeve 14, and one end of the sleeve 14 passes through the optical hole to be in threaded connection with the threaded hole, so that the sleeve 14 and the first mounting plate 111 are prevented from being deflected; the other end is connected to the connecting portion 122 of the bushing 12 at the end facing away from the pressing portion 121, and the core rod 2 passes through the sleeve 14 and the bushing 12, so that the connection of the bushing 12 to the first mounting plate 111 is achieved, and the bushing 12 is prevented from being deflected from the first mounting plate 111.

Alternatively, as shown in fig. 1 and 9, the pressing portion 121 further includes an intermediate portion 123 disposed between the pressing portion 121 and the connecting portion 122, the intermediate portion 123 has an outer diameter larger than that of the pressing portion 121, the pressing portion 121 is sleeved with an auxiliary plate 15, the auxiliary plate 15 can abut on an end portion of the intermediate portion 123 facing the pressing portion 121, and the auxiliary plate 15 is disposed to prevent the structural member 100 from moving in the axial direction. Correspondingly, the connecting portion 122 of the bushing 12 is provided with an external thread to be threadedly connected with the sleeve 14.

Alternatively, as shown in fig. 9, the pressing portion 121 is opened with an opening 1211 along the extending direction thereof, and when the operating ring 21 passes through the pressing portion 121, the pressing portion 121 is expanded radially outward through the opening 1211.

Alternatively, as shown in fig. 10, the end of the mandrel 2 is provided with an external thread to be connected with the second connecting element 31; specifically, the mandrel 2 is provided with the second stopper 22, and the second stopper 22 can abut against the second fixing ring 32 to prevent the mandrel 2 from axially moving with respect to the second connecting element 31. Optionally, chamfers are provided on both sides of the working ring 21, the chamfers provided at the ends facilitate the installation of the structural member 100 on the bushing 12 through the mandrel 2, and the chamfers on the other side facilitate the penetration of the working ring 21 into the pressing part 121.

Specifically, the center line of the mandrel 2 is collinear with the center lines of the mounting hole of the structural member 100, the center hole 1122 of the second mounting plate 112, and the second stepped hole 1112 of the first mounting plate 111, respectively, to prevent the cold extrusion mounting holes from being deviated, and ensure quality.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A cold extrusion clamp for holes is characterized by comprising:

the supporting unit (1) comprises a fixing frame assembly used for being fixed with an external frame body and a bushing (12) fixedly arranged on the fixing frame assembly, wherein one end of the bushing (12) is provided with a pressing part (121), and the pressing part (121) is used for penetrating through an assembling hole of a structural part (100);

a mandrel (2) passing through and slidably connected to the bushing (12), wherein one end of the mandrel (2) is used for connecting with an external driving assembly, the other end of the mandrel is provided with a working ring (21), the outer diameter of the working ring (21) is larger than the inner diameter of the extrusion part (121), and the working ring (21) can pass through the extrusion part (121);

in a first state, the working ring (21) is arranged outside the bushing (12), and in a second state, the working ring (21) penetrates through the extrusion part (121); the external driving component can drive the core rod (2) to move, so that the first state and the second state are mutually switched.

2. The cold extrusion jig for holes as claimed in claim 1, wherein the fixing frame assembly comprises a first mounting plate (111), a second mounting plate (112) and a column (113) connected between the first mounting plate (111) and the second mounting plate (112), an accommodating space (1A) is formed between the first mounting plate (111) and the second mounting plate (112), the bushing (12) is fixedly arranged on the first mounting plate (111) and arranged in the accommodating space (1A), and one end of the mandrel (2) for connecting with an external driving assembly is arranged outside the accommodating space (1A).

3. A cold extrusion jig for holes according to claim 2,

the first mounting plate (111) is provided with a through hole (1111), and the upright post (113) penetrates through the through hole (1111) and is connected with a first nut (114);

the second mounting plate (112) is provided with a first step hole (1121), the first step hole (1121) comprises an optical hole and a threaded hole, and the upright column (113) penetrates through the optical hole and is connected to the threaded hole.

4. A cold extrusion jig for holes according to claim 2,

a first connecting assembly is arranged on the second mounting plate (112), and the first connecting assembly is connected to the outer frame body through a fastener;

one end of the core rod (2) is connected with a second connecting assembly (3), the second connecting assembly (3) is connected with the external driving assembly through a fastener, and the second connecting assembly (3) is arranged outside the accommodating space (1A).

5. A cold extrusion jig for holes according to claim 4,

the first connecting assembly comprises a first connecting element (131), a second nut (132) and a first fixing ring (133), a central hole (1122) is formed in the second mounting plate (112), the first connecting element (131) penetrates through the central hole (1122) and extends into the accommodating space (1A), one end, extending into the accommodating space (1A), of the first connecting element (131) is in threaded connection with the second nut (132), the first fixing ring (133) is sleeved at the middle position of the first connecting element (131), and the second nut (132) and the first fixing ring (133) are abutted to two sides of the second mounting plate (112);

the second connecting component (3) comprises a second connecting element (31) and a second fixing ring (32), the mandrel (2) is in threaded connection with one end of the second connecting element (31), the other end of the second connecting element (31) is used for being connected with the external driving component, and the second fixing ring (32) is arranged on the periphery of the second connecting element (31) and can be abutted to the external driving component.

6. A cold extrusion jig for holes according to claim 5, wherein the first connecting member (131) is radially provided with a first pin hole (1312), and the second connecting member (31) is radially provided with a second pin hole (311).

7. The cold extrusion jig for holes as claimed in claim 5, wherein the first fixing ring (133) and the second fixing ring (32) are symmetrically provided with two pairs of hook plate grooves (321) at the outer circumference.

8. The cold extrusion jig for hole as claimed in claim 2, wherein the first mounting plate (111) is provided with a second stepped hole (1112), the second stepped hole (1112) comprises a smooth hole and a threaded hole, the support unit (1) further comprises a sleeve (14), one end of the sleeve (14) passes through the smooth hole to be in threaded connection with the threaded hole, the other end of the sleeve is connected with a connecting part (122) of the bushing (12) at the end facing away from the extrusion part (121), and the core rod (2) passes through the sleeve (14) and the bushing (12).

9. A cold extrusion jig for holes according to claim 8, characterized in that the extrusion portion (121) further comprises an intermediate portion (123) provided between the extrusion portion (121) and the connection portion (122), the intermediate portion (123) having an outer diameter larger than that of the extrusion portion (121), the extrusion portion (121) being fitted with an auxiliary plate (15), the auxiliary plate (15) being capable of abutting on an end portion of the intermediate portion (123) toward the extrusion portion (121).

10. A cold extrusion jig for holes as claimed in any one of claims 1 to 9, wherein said extrusion portion (121) is provided with an opening (1211) along its extending direction.

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