CN210789224U - Forming die and cold isostatic die - Google Patents

Abstract

The utility model provides a forming die and cold isostatic mould relates to mould technical field. The forming die is provided with a pressure cavity, the pressure cavity is provided with a main cavity body and a transition cavity, the transition cavity is communicated with the tail end of the main cavity body, and the cross sectional area of the transition cavity is gradually reduced along the direction far away from the main cavity body; the molding die has an opening that can be opened or closed. The structure relieves the problem that the workpiece with the flat end surface formed by the die in the prior art is easy to crack in the subsequent forging process so as to influence the processing and the use of the workpiece. The utility model provides a cold isostatic mould includes above-mentioned forming die.

Description

Forming die and cold isostatic die

Technical Field

The utility model relates to the technical field of mold, concretely relates to forming die and cold isostatic mould.

Background

Isostatic compaction is to press fluid medium (gas or liquid) into a high-pressure resistant steel sealed container by means of a high-pressure pump, the static pressure of the high-pressure fluid acts on the powder in an elastic die sleeve, and the powder body is uniformly pressed in all directions at the same time to obtain a workpiece with uniform density distribution and high strength. Isostatic pressing includes cold isostatic pressing, which is usually called hydrostatic pressure, hydrostatic pressure or oil-water pressure because water or oil is used as a pressure medium.

Cold isostatic pressing is a common method for metal powder molding, wherein metal powder is filled into a mold, and under the action of hydraulic pressure, the metal powder is stressed in all directions in a pressing cavity of the mold in a balanced manner and is subjected to pressure molding.

Among the prior art, utilize mould shaping round bar, the both ends of round bar after the shaping are the flush end face, follow-up carry out the plastic working in-process to this round bar, especially radially forge the in-process, and smooth port atress effect is unsatisfactory, when carrying out radial impact forging to the end, the tip takes place deformation in the twinkling of an eye, and the terminal surface is under the effect of deformation in the twinkling of an eye tear power, very easily ftractures to the processing and the use of serious influence work piece.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a forming die and cold isostatic pressing mould to alleviate the work piece of the flat end face that the mould shaping that exists among the prior art goes out, the easy fracture so that influence the processing and the problem of use of work piece in follow-up forging process.

The utility model provides a forming die, which is provided with a pressure cavity, wherein the pressure cavity is provided with a main cavity body and a transition cavity, the transition cavity is communicated with the tail end of the main cavity body, and the cross section area of the transition cavity is gradually reduced along the direction far away from the main cavity body; the molding die has an opening that can be opened or closed.

Further, the forming die comprises an elastic forming sleeve and an end forming piece.

The elastic forming sleeve is provided with an opening, and the end part forming part is used for opening or closing the opening and is connected with the elastic forming sleeve to form a pressing cavity.

Further, the elastic forming sleeve comprises a forming sleeve main body and a forming sleeve end cover, the forming sleeve main body is provided with a main cavity body, the forming sleeve end cover is plugged at the first end of the forming sleeve main body, and the opening is formed in the second end of the forming sleeve main body and communicated with the main cavity body.

Further, the profiling cavity comprises two transition cavities, namely a first transition cavity located in the end cover of the forming sleeve and a second transition cavity located in the end forming part.

When the end part forming part is connected to the forming sleeve main body, the first transition cavity, the main cavity body and the second transition cavity form a pressing cavity together.

Further, the end forming piece comprises an end plug, and the second transition cavity is arranged in the end plug; the end plug can be inserted into the elastic forming sleeve through the opening or pulled out of the elastic forming sleeve.

Further, the outer wall of the elastic forming sleeve is provided with a hoop piece, and the hoop piece hoops the elastic forming sleeve on the end plug.

Furthermore, an annular groove is formed in the outer wall of the end plug, the tightening piece is accommodated in the annular groove, and the elastic forming sleeve is connected with the end plug in a sealing mode through the tightening piece.

Further, the elastic molding sleeve is made of rubber, and/or the end molding piece is made of rubber.

Further, the first transition cavity is a hemispherical cavity, and/or the second transition cavity is a hemispherical cavity.

The utility model also provides a cold isostatic mould, including foretell forming die.

Compared with the prior art, the utility model provides a forming die and cold isostatic pressing mould have the technical advantage to be:

the utility model provides a forming die, a profiling cavity of which is provided with a main cavity body and a transition cavity, the transition cavity is communicated with the tail end of the main cavity body, and the cross section area of the transition cavity is gradually reduced along the direction far away from the main cavity body; the molding die has an opening that can be opened or closed.

Utilize above-mentioned structure, pack the die mould intracavity with the metal powder material from forming die's opening, closed this opening, to the forming die pressurization that is filled with the metal powder material, forming die receives external pressure to give the metal powder material of die mould intracavity with pressure transfer, make the metal powder material shaping in forming die's die mould intracavity. And after the forming is finished, opening the opening, and taking out the formed workpiece.

In the structure, the end of the main cavity body of the pressing cavity is provided with the transition cavity, the cross-sectional area of the transition cavity is gradually reduced along the direction far away from the main cavity body, according to the extrusion forming principle, the metal powder material can be filled with the whole pressing cavity in the extrusion process, therefore, the transition cavity is filled with the metal powder material, after the extrusion forming, the shape of the workpiece is consistent with the shape of the pressing cavity, and therefore the tail end part of the workpiece also has the transition part which is consistent with the transition cavity shape at the end of the main cavity body. The cross-sectional area of the transition portion that this transition chamber shaping was gone out reduces along the direction of keeping away from the work piece section that main cavity body shaping was gone out gradually, when the work piece tip received forging impact, the tip can take place deformation in the twinkling of an eye, this transition portion received this power of tearing of deformation in the twinkling of an eye this moment, and takes place deformation to alleviate the direct impact to the work piece terminal surface of power of tearing that deformation produced in the twinkling of an eye, reduce the terminal surface by a wide margin and lead to tearing risk because of deformation in the twinkling of an eye, thereby guarantee processing and the performance of.

Compared with a workpiece with a flat end face formed by a die in the prior art, the forming die relieves the problem that the workpiece with the flat end face formed by the die in the prior art is easy to crack in the subsequent forging process so as to influence the processing and use of the workpiece.

The utility model provides a cold isostatic mould, including above-mentioned forming die to this cold isostatic mould's advantage includes above-mentioned forming die's advantage, no longer gives unnecessary details.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a forming mold according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a forming mold according to an embodiment of the present invention when an opening is opened;

fig. 3 is a schematic cross-sectional view of a forming mold according to an embodiment of the present invention when an opening is closed;

fig. 4 is a schematic cross-sectional structure diagram of a workpiece formed by a forming mold according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a workpiece formed by using the forming die provided in this embodiment;

fig. 6 is a schematic structural view of an end plug of a forming die provided by an embodiment of the present invention.

Icon: 100-forming a mold; 110-an elastic forming sleeve; 111-forming sleeve body; 020-main cavity; 112-forming sleeve end covers; 010-a first transition chamber; 120-end profile; 121-a second transition chamber; 122-an annular groove; 130-an opening; 140-pressing the cavity; 200-a workpiece; 210-transition.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "middle part", "upper", "both ends", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, which is only for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

The specific structure is shown in fig. 1-6.

As shown in fig. 1 to 4, in the forming mold 100 provided by this embodiment, the forming mold 100 has a pressure cavity 140, the pressure cavity 140 has a main cavity 020 and a transition cavity, the transition cavity is communicated with a distal end of the main cavity 020, and a cross-sectional area of the transition cavity gradually decreases along a direction away from the main cavity 020; the molding die 100 has an opening 130, and the opening 130 can be opened or closed.

With the above-described structure, the metal powder material is filled into the die cavity 140 from the opening of the molding die 100, the opening 130 is closed, the molding die 100 filled with the metal powder material is pressurized, the molding die 100 receives external pressure, and the pressure is transmitted to the metal powder material in the die cavity 140, so that the metal powder material is molded in the die cavity 140 of the molding die 100. After the molding is completed, the opening 130 is opened, and the molded workpiece 200 is taken out.

Preferably, the molding die 100 is pressurized by a uniform pressure in each direction, for example, by a hydraulic pressure or a pneumatic pressure. The forming die 100 is subjected to external uniform pressure from all directions, and transmits the uniform pressure from all directions to the metal powder material in the pressing cavity 140, so that the stress of the workpiece to be formed is uniform in all directions, the uniform density inside the formed workpiece is ensured, and the good stress performance is ensured.

Preferably, the transition chamber is disposed at the distal end of the main chamber 020, so that the cross-sectional area of the profiling chamber 140 at the position close to the distal end gradually changes from large to small. It should be noted that the number of the ends of the main cavity 020 of the die cavity 140 is not limited, and in this embodiment, a forming die for forming a round bar material is taken as an example, so that the main cavity 020 of the die cavity 140 has two ends.

In the structure, the tail end of the main cavity 020 of the profiling cavity 140 is provided with the transition cavity, the cross-sectional area of the transition cavity is gradually reduced along the direction far away from the main cavity 020, according to the extrusion forming principle, the metal powder material can be filled in the whole profiling cavity 140 in the extrusion process, therefore, the transition cavity is filled with the metal powder material, after the extrusion forming, the shape of the workpiece 200 is consistent with that of the profiling cavity 140, and therefore the tail end part of the workpiece 200 is also provided with the transition part 210 which is consistent with that of the transition cavity at the tail end of the main cavity 020. The cross-sectional area of this transition portion 210 that transition chamber shaping goes out reduces along the direction of keeping away from the work piece section that main cavity body 020 shaping goes out gradually, when work piece 200 tip received forging impact, the tip can take place deformation in the twinkling of an eye, this transition portion 210 receives this tearing power of deformation in the twinkling of an eye this moment, and take place deformation, thereby alleviate the direct impact to work piece 200 terminal surface of tearing power that deformation produced in the twinkling of an eye, reduced the terminal surface by a wide margin and led to torn risk because of deformation in the twinkling of an eye, thereby guarantee work piece 200's processing and performance.

In an alternative embodiment, referring mainly to fig. 1-4, the forming mold 100 includes an elastic forming sleeve 110 and an end forming member 120. The elastic forming sleeve 110 is opened with an opening 130, and the end molding part 120 is used for opening or closing the opening 130 and is connected with the elastic forming sleeve 110 to form a pressing cavity 140.

The forming mold 100 includes two parts, namely an elastic forming sleeve 110 and an end forming part 120, and the elastic forming sleeve 110 is opened with an opening 130, and a metal powder material can be fed into the elastic forming sleeve 110 through the opening 130, and the formed workpiece 200 can be extracted from the elastic forming sleeve 110 by using the opening 130. The metal powder material is fed into the elastic molding sleeve 110 through the opening 130, the end molding 120 is connected to the elastic molding sleeve 110, the opening 130 of the elastic molding sleeve 110 is closed by the end molding 120, and the press cavity 140 is formed. The forming die 100 filled with the metal powder material is uniformly pressurized, so that the elastic forming sleeve 110 and the end forming part 120 uniformly extrude the metal powder material in the profiling cavity 140, and finally the workpiece 200 is formed. The end form 120 is removed thereby opening the opening 130 and withdrawing the workpiece 200.

It should be noted that the elastic forming sleeve 110 is an elastic structure, the elastic forming sleeve 110 is loaded with metal powder materials, when the elastic forming sleeve 110 is subjected to external uniform pressure, the elastic forming sleeve 110 can transmit the uniform pressure applied to each position to the metal powder materials inside the elastic forming sleeve 110 by using the characteristic of elasticity, so that the pressure applied to each position of the materials is equal and equal to the pressure applied from the outside, and thus the density of each position of the formed workpiece 200 is the same, the uniformity of the internal density of the workpiece 200 is ensured, and the mechanical property is good.

In addition, the forming mold 100 may also include two elastic forming sleeves 110, each of the two elastic forming sleeves 110 has an opening 130, the two elastic forming sleeves 110 are filled with the metal powder material, the ends of the two elastic forming sleeves 110 having the openings 130 are connected, and the two openings 130 are communicated, so that uniform pressure is applied to the two connected elastic forming sleeves 110 to perform pressure forming on the metal powder material in the elastic forming sleeves 110, and after forming, the two elastic forming sleeves 110 are disassembled, and the formed workpiece 200 is taken out.

In an optional technical solution of this embodiment, referring mainly to fig. 1 to 4, the elastic forming sleeve 110 includes a forming sleeve main body 111 and a forming sleeve end cover 112, the forming sleeve main body 111 has a main cavity 020, the forming sleeve end cover 112 is sealed at a first end of the forming sleeve main body 111, and the opening 130 is disposed at a second end of the forming sleeve main body 111 and is communicated with the main cavity 020.

In the above structure, the forming sleeve end cap 112 is sealed at the first end of the forming sleeve main body 111, the opening 130 is provided at the second end of the forming sleeve main body 111, the metal powder material can enter the main cavity 020 through the opening 130, and the formed workpiece 200 can be drawn out from the main cavity 020 through the opening 130. The end molding 120 can be connected to the second end to open or close the opening 130. The end molding piece 120 and the forming sleeve end cover 112 are used to respectively seal the two ends of the main cavity 020 of the forming sleeve main body 111, so as to form the die cavity 140.

In an alternative embodiment, referring mainly to fig. 1-4 and fig. 6, the profiling cavity 140 includes two transition cavities, namely a first transition cavity 010 located in the forming sleeve end cover 112 and a second transition cavity 121 located in the end molding 120.

When the end molding 120 is connected to the molding sleeve main body 111, the first transition cavity 010, the main cavity 020, and the second transition cavity 121 together form a press cavity 140.

Specifically, the forming sleeve end cover 112 blocks the first end of the forming sleeve main body 111, the first transition cavity 010 of the forming sleeve end cover 112 is disposed towards the main cavity 020, and the first transition cavity 010 is communicated with the main cavity 020. When the end molding 120 is connected to the second end of the molding sleeve main body 111, the second transition cavity 121 of the end molding 120 is disposed toward the main cavity 020 and communicates with the main cavity 020. With the first transition cavity 010 and the second transition cavity 121, the transition portion 210 can be formed at both ends of the workpiece 200 formed in the profiling cavity 140. By utilizing the structure that the cross sectional areas of the first transition cavity 010 and the second transition cavity 121 are gradually reduced along the direction far away from the main cavity 020, the transition parts 210 at the two ends of the workpiece 200 are also gradually reduced along the direction far away from the main cavity 020. With the two transitions, the risk of cracking of the end faces of the end of the workpiece 200 during subsequent forging is greatly reduced.

In an alternative solution of this embodiment, referring mainly to fig. 1-4 and fig. 6, the end forming member 120 includes an end plug, and the second transition cavity 121 is disposed in the end plug; the end plug can be inserted into the elastic form sleeve 110 through the opening 130 or pulled out of the elastic form sleeve 110.

The end forms 120 are end plugs that are inserted into the elastic forming sleeve 110 through the openings 130. Preferably, the outer diameter of the end plug is slightly larger than the inner diameter of the elastic forming sleeve 110, so that the end plug is inserted into the elastic forming sleeve 110 and forms an interference fit with the elastic forming sleeve 110 to prevent the end plug from being removed, and simultaneously prevent metal powder from leaking out of the gap between the end plug and the elastic forming sleeve 110.

In an alternative embodiment of this embodiment, and referring primarily to fig. 1-4 and 6, the outer wall of the elastic forming sleeve 110 is provided with a tightening member that tightens the elastic forming sleeve 110 to the end plug.

In the above structure, the tightening member can tighten the elastic forming sleeve 110 and tightly connect the elastic forming sleeve 110 with the end plug. This arrangement enables the end plug to be securely attached to the elastic forming sleeve 110 and prevents the end plug from being removed from the elastic forming sleeve 110.

In an alternative technical solution of this embodiment, referring mainly to fig. 1-4 and fig. 6, an annular groove 122 is formed in an outer wall of the end plug, and the tightening member is accommodated in the annular groove 122 and makes the elastic forming sleeve 110 and the end plug be connected in a sealing manner.

Specifically, the outer wall of the end plug is provided with an annular groove 122, after the end plug is plugged into the elastic forming sleeve 110, the outer wall of the elastic forming sleeve 110 is hooped by the hooping piece, and the elastic forming sleeve 110 is elastically deformed under the hooping pressure of the hooping piece by the elasticity of the elastic forming sleeve 110. This arrangement further provides a seal of the end plug to the elastic forming sleeve 110 by the elastic deformation at the location of the cinch on the elastic forming sleeve 110 being recessed and fitting into the annular groove 122. Preventing pressure medium from leaking into the elastic forming sleeve 110 during the press forming process or preventing metal powder material from leaking out of the elastic forming sleeve 110.

Preferably, the binding member is a wire or a steel wire, and the elastic forming sleeve 110 is fastened with the wire or the steel wire. Adopt iron wire or steel wire as binding member, can adjust the dynamics of tightening according to the technology needs at any time, convenient to detach simultaneously.

In addition, other cords may be used as the cinch. An elastic loop member, such as a rubber ring, may also be used to directly hoop around the elastic forming sleeve 110.

In an optional technical solution of this embodiment, the elastic forming sleeve 110 is made of rubber, or the end forming member 120 is made of rubber. Preferably, the elastic molding sleeve 110 and the end molding member 120 are made of rubber.

The elastic forming sleeve 110 is made of rubber, and the rubber can transmit the uniform pressure applied to the elastic forming sleeve 110 to the metal powder material in the die cavity 140. Specifically, this rubber material's elastic forming cover 110 receives the even pressure of all directions, produces even elastic deformation towards the metal powder material, and this elastic deformation volume is very little, utilizes this elastic deformation this elastic forming cover 110 can tightly hoop outside the metal powder material to on transmitting even pressure to the metal powder material, make the metal powder material can evenly compression moulding.

Or the end forming member 120 is made of rubber, and the end plug is also made of rubber, so that the end plug has certain elasticity. Can produce certain deformation when the pressurized, fill the gap between end plug and the elasticity forming sleeve 110, prevent during the shaping, in external pressure medium infiltration elasticity forming sleeve 110, simultaneously, also prevent that the metal powder material in the elasticity forming sleeve 110 from spilling.

Preferably, the elastic molding sleeve 110 and the end molding member 120 are made of rubber. The rubber material is adopted, and has good elasticity, good processing performance and lower cost. And the elastic molding sleeve 110 and the end molding piece 120 are made of rubber, so that the advantages of the elastic molding sleeve 110 and the end molding piece 120 made of rubber are achieved.

In an alternative technical solution of this embodiment, referring mainly to fig. 1 to 4, the main cavity 020 is a cylindrical cavity.

In an optional technical solution of this embodiment, referring mainly to fig. 1 to 6, the first transition cavity 010 is a hemispherical cavity, or the second transition cavity 121 is a hemispherical cavity. Preferably, the first transition cavity 010 and the second transition cavity 121 are both hemispherical cavities.

The round bar workpiece can be formed by adopting the main cavity 020 of the cylindrical cavity. Preferably, the main cavity 020 of the elastic forming sleeve 110 is a cylindrical cavity, the first transition cavity 010 of the forming sleeve end cover 112 is a hemispherical cavity, and the second transition cavity 121 of the end plug is also a hemispherical cavity. First transition chamber 010, main cavity 020 and second transition 121 chamber form pressure die cavity 140 to, the middle section that presses die cavity 140 is cylindric cavity, and first transition chamber 010 and the second transition chamber 121 at the both ends of pressure die cavity are the hemisphere chamber. Therefore, the press cavity 140 can be used to form a round bar workpiece with hemispherical transition portions 210 at both ends.

The embodiment also provides a cold isostatic pressing die, which comprises the forming die 100. The working process of forming the round bar by using the cold isostatic pressing die is as follows:

utilize the funnel to fill the metal powder material in the elastic forming sleeve 110 through opening 130, at the filling in-process, this elastic forming sleeve 110 of manual vibration that needs to be interrupted, the vibration makes the metal powder material that is in loose natural state become compact, and the increase is waited fashioned work piece density, makes the density of each position department even simultaneously. After the metal powder material is filled, the end plug is plugged into the opening 130 so that the end plug is sealed with the elastic forming sleeve 110 to prevent the metal powder material from flowing out. The sealed forming mold 100 is placed on a flat plate, the forming mold 100 is rolled, the thickness uniformity of the elastic forming sleeve 110 is observed, and the diameter of the whole elastic forming sleeve 110 in the length direction is uniform in a rolling mode. In the process of rolling the forming die 100, the elastic forming sleeve 110 utilizes its own elastic characteristics, and in the process of continuously rolling and extruding, the redundant air in the elastic forming sleeve 110 is discharged, so that the cold isostatic pressing forming rate can be further improved.

The elastic forming sleeve 110 is tightened by a steel wire, so that the elastic forming sleeve 110 is elastically deformed and is recessed downwards and embedded into the annular groove 122 on the end plug, and it is ensured that a pressure medium cannot penetrate into the elastic forming sleeve 110 to affect the forming of the workpiece 200 in the compression process of the forming die 100.

The forming die 100 is placed into a pressure device, the pressure device is started, and gas or liquid is used to uniformly apply pressure to the forming die 100, so that the metal powder material is uniformly pressed in the pressing cavity 140 to form a workpiece with hemispherical transition portions 210 at two ends.

Preferably, the forming die 100 eliminates the outermost metal wrap. The above-mentioned manner of rolling the forming die 100 before pressurization is utilized to make the diameter of the elastic forming sleeve 110 uniform at each position in the length direction, so as to replace the outer metal sheath, so that the metal powder material in the elastic forming sleeve 110 is kept in a state of uniform diameter in the length direction, and after pressurization, a round bar workpiece with uniform diameter in the length direction can be formed.

Taking the pressed molybdenum powder as an example, 10 high-purity molybdenum powder round bars are formed by using the cold isostatic pressing die of the embodiment. In the same process operation, only one end of the round bar material cracks when the rotary swaging feed is carried out. In the prior art, when a die without a transition cavity is used for forming, under the same forming process and during rotary swaging feeding, the end parts of 4 round bars are cracked. The cold isostatic pressing die of the embodiment greatly reduces the risk of cracking of the end of the molybdenum powder round bar in the subsequent forging process, so that the cold isostatic pressing die of the embodiment has a far better using effect than a die without a transition cavity in the prior art.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. A forming die, characterized in that the forming die (100) is provided with a pressing cavity (140), the pressing cavity (140) is provided with a main cavity body (020) and a transition cavity, the transition cavity is communicated with the tail end of the main cavity body (020), and the cross-sectional area of the transition cavity is gradually reduced along the direction far away from the main cavity body;

the molding die (100) has an opening (130), and the opening (130) can be opened or closed.

2. The forming die of claim 1, wherein the forming die (100) comprises an elastic forming sleeve (110) and an end forming piece (120);

the elastic forming sleeve (110) is provided with the opening (130), and the end part forming part (120) is used for opening or closing the opening (130) and is connected with the elastic forming sleeve (110) to form the pressing cavity (140).

3. The forming die of claim 2, wherein the elastic forming sleeve (110) comprises a forming sleeve main body (111) and a forming sleeve end cover (112), the forming sleeve main body (111) has the main cavity (020), the forming sleeve end cover (112) is sealed at a first end of the forming sleeve main body (111), and the opening (130) is arranged at a second end of the forming sleeve main body (111) and is communicated with the main cavity (020).

4. The forming die according to claim 3, characterized in that the die cavity (140) comprises two transition cavities, respectively a first transition cavity (010) at the forming sleeve end cap (112) and a second transition cavity (121) at the end molding (120);

when the end molding (120) is connected to the forming sleeve main body (111), the first transition cavity (010), the main cavity (020), and the second transition cavity (121) jointly form the pressing cavity (140).

5. The forming die as claimed in claim 4, wherein the end molding (120) includes an end plug, the second transition cavity (121) being provided to the end plug; the end plug can be plugged into the elastic forming sleeve (110) through the opening (130) or pulled out of the elastic forming sleeve (110).

6. The forming die as claimed in claim 5, characterized in that the outer wall of the elastic forming sleeve (110) is provided with a tightening member which tightens the elastic forming sleeve (110) to the end plug.

7. The forming die as claimed in claim 6, wherein the outer wall of the end plug is provided with an annular groove (122), the tightening member is received in the annular groove (122), and the tightening member sealingly connects the elastic forming sleeve (110) to the end plug.

8. The forming die according to any one of claims 2-5, characterised in that the elastic forming sleeve (110) is of rubber material and/or the end forming member (120) is of rubber material.

9. The forming die of claim 4 or 5, wherein the first transition cavity is a hemispherical cavity and/or the second transition cavity is a hemispherical cavity.

10. A cold isostatic mould, characterised in that it comprises a forming mould according to any one of claims 1-9.

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