Hot isostatic pressing forming die

Abstract

The utility model relates to the technical field of hot isostatic pressing, in particular to a hot isostatic pressing forming die which comprises an inner sleeve, an outer sleeve and a core rod, the upper end and the lower end of the inner sleeve and the upper end and the lower end of the outer sleeve are welded and fixed through plug rings, and the hot isostatic pressing forming die further comprises two plugs fixed to the two ends of the inner sleeve respectively. Each plug comprises a plug cover and an annular wall fixed to the inner side of the plug cover, the two ends of the core rod are embedded into the annular walls of the corresponding plugs respectively, first annular edge grooves are formed in the inner side walls of the two ends of the inner sleeve, and the outer side wall of each annular wall is in threaded connection with the inner side wall of the corresponding first annular edge groove. According to the hot isostatic pressing forming die, the end caps are fixed to the two ends of the inner sleeve respectively, the two ends of the core rod are embedded into the annular walls of the end caps respectively, fixing of the core rod can be achieved, the inner sleeve is prevented from deforming to damage a product structure, then the end caps are connected into the first annular edge grooves in the two ends of the inner sleeve through the threads, and the end caps are convenient to disassemble; the structure is simple and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of hot isostatic pressing, in particular to a hot isostatic pressing forming die. Background Art

[0002] Hot isostatic pressing (HIP) involves placing a product in a sealed container, applying equal pressure in all directions, and simultaneously subjecting it to high temperature. Under this high temperature and pressure, the product is sintered and densified. It is currently a commonly used technique in billet production. HIP can be used for direct powder forming. The powder is enclosed in a mold-like package made of metal or ceramic (mild steel, Ni, Mo, glass, etc.). Nitrogen or argon is then used as the pressurizing medium to heat, pressurize, and sinter the powder. Alternatively, the formed casting, including those with shrinkage cavities such as aluminum alloys, titanium alloys, and high-temperature alloys, can be densified. After HIP, the casting can achieve 100% densification, improving the overall mechanical properties of the casting.

[0003] In the hot isostatic pressing (HIP) process, the cladding is a crucial tool and key to ensuring product performance. Therefore, the cladding must meet certain requirements, such as being stable and preventing contamination of the product under high-temperature conditions. Existing HIP claddings are typically simple rectangular structures welded together from six plates, one of which has an exhaust pipe fixed to the inner cavity of the cladding. While this cladding structure is simple and inexpensive to manufacture, it has drawbacks. Under high-temperature and high-pressure conditions, welds at the edges can easily break, or the plates can deform, altering the shape of the product. Alternatively, the product may fail to meet density requirements, resulting in a substandard product.

[0004] Chinese utility model patent publication number CN206652973U discloses a tubular sheath for hot isostatic pressing (HIP), comprising a sheath wall and an exhaust pipe fixedly mounted on the sheath wall. The sheath wall encloses a raw material cavity for containing powder, and the exhaust pipe is connected to the raw material cavity. The sheath wall comprises a tubular outer wall and a tubular inner wall disposed at the center of the outer wall. The upper and lower ends of the inner and outer walls are fixedly connected by an upper blocking ring and a lower blocking ring, respectively. The inner wall, outer wall, upper blocking ring, and lower blocking ring collectively enclose a tubular raw material cavity, and the exhaust pipe passes through and is mounted on the upper blocking ring. The lower blocking ring has a U-shaped cross-section and opens outward. The vertical portion of the U-shape is respectively bonded to and welded to the inner and outer walls. The upper and lower blocking rings have the same structure. This patent provides a tubular sheath particularly suitable for HIP sintering of pipe products. The welded sealing method at the ends ensures stability under high temperature and high pressure environments while preventing deformation of the product. However, since the core rod needs to be inserted into the inner wall, a certain gap is still required between the core rod and the inner wall for insertion. The core rod of this patent is not fixed, which will cause local deformation of the shape of the product. Moreover, the lower cover of this patent is welded and fixed to the bottom of the lower blocking ring, which is not convenient for disassembly. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a hot isostatic pressing die.

[0006] The purpose of the utility model is achieved through the following technical solutions: a hot isostatic pressing forming mold, the forming mold includes an inner sleeve, an outer sleeve sleeved on the outside of the inner sleeve and a core rod sleeved in the inner sleeve, the upper and lower ends of the inner sleeve and the outer sleeve are fixed by welding through blocking rings, the inner sleeve, the outer sleeve and the two blocking rings form a raw material cavity for accommodating powder, the forming mold also includes two plugs respectively fixed at the two ends of the inner sleeve, each plug includes a blocking cover and an annular wall fixed on the inner side of the blocking cover, the two ends of the core rod are respectively embedded in the annular walls of the corresponding plugs, the inner side walls at both ends of the inner sleeve are provided with a first annular edge groove, the outer wall of each annular wall is connected to the inner wall of the corresponding first annular edge groove by a thread.

[0007] Furthermore, positioning grooves are provided at both ends of the middle part of the core rod, and positioning holes are respectively provided in the middle part of the two plugs corresponding to the positioning grooves at both ends of the core rod. The forming mold also includes two positioning parts, and each positioning part includes a first positioning part and a second positioning part integrally formed from the outside to the inside. The first positioning part cooperates with the positioning hole and is embedded in the positioning hole, and the second positioning part cooperates with the positioning groove and is embedded in the positioning groove.

[0008] Furthermore, the positioning groove includes a truncated cone groove, a cylindrical groove and a conical groove connected in sequence from the outside to the inside, and the inner diameter of the truncated cone groove and the outer diameter of the conical groove are both equal to the diameter of the cylindrical groove; the second positioning portion includes a truncated cone portion, a cylindrical portion and a conical portion fixed in sequence from the outside to the inside, and the inner diameter of the truncated cone portion and the outer diameter of the conical portion are both equal to the diameter of the cylindrical portion.

[0009] Furthermore, the length of the core rod is greater than the length of the raw material cavity.

[0010] Furthermore, the outer side walls at both ends of the inner sleeve are respectively provided with annular protrusions protruding outwards.

[0011] Furthermore, a second annular edge groove is opened on the outer side wall of the annular protrusion, and the inner side wall of each blocking ring is embedded in the second annular edge groove and welded fixed, and the outer side wall of each blocking ring is attached to and welded fixed to the inner side wall of the outer sleeve.

[0012] Furthermore, a first annular groove is formed on the inner side of each of the first annular edge grooves.

[0013] Furthermore, a second annular groove is provided in the middle portion of the outer side of each blocking ring, and a third annular side groove is provided on the outer edge of each blocking ring.

[0014] Furthermore, the inner edge of each plug is provided with a chamfer.

[0015] Furthermore, the forming mold also includes an exhaust pipe connected to the raw material cavity.

[0016] The beneficial effect of the utility model is that the hot isostatic pressing mold of the utility model fixes the plugs at both ends of the inner sleeve respectively, and embeds the two ends of the core rod into the annular wall of the plug respectively, so as to fix the core rod and avoid deformation of the inner sleeve and damage to the product structure. The plug is then connected to the first annular edge groove at both ends of the inner sleeve by a thread, which makes it easy to disassemble the plug. The structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the forming mold of the present invention.

[0018] Figure 2 It is a top view of the forming mold of the present invention.

[0019] Figure 3 It is a partial cross-sectional view of the forming mold of the present invention.

[0020] Figure 4 It is a cross-sectional view of the inner sleeve, core rod and plug described in the utility model.

[0021] Figure 5 It is a cross-sectional view of the inner sleeve, outer sleeve and blocking ring of the utility model.

[0022] The figures are marked as: inner sleeve 1, first annular edge groove 11, annular protrusion 12, second annular edge groove 13, first annular groove 14, outer sleeve 2, core rod 3, positioning groove 31, truncated cone groove 311, cylindrical groove 312, conical groove 313, blocking ring 4, second annular groove 41, third annular edge groove 42, raw material cavity 5, plug 6, blocking cover 61, annular wall 62, positioning hole 63, chamfer 64, positioning piece 7, first positioning portion 71, second positioning portion 72, truncated cone portion 721, cylindrical portion 722, conical portion 723. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the following embodiments and accompanying drawings are provided. Figure 1-5 To further illustrate the present invention, the contents mentioned in the implementation manner are not intended to limit the present invention.

[0024] See Figure 1-5 , a hot isostatic pressing forming mold, the forming mold includes an inner sleeve 1, an outer sleeve 2 sleeved on the outside of the inner sleeve 1 and a core rod 3 sleeved in the inner sleeve 1, the upper and lower ends of the inner sleeve 1 and the outer sleeve 2 are welded and fixed by blocking rings 4, the inner sleeve 1, the outer sleeve 2 and the two blocking rings 4 form a raw material cavity 5 for accommodating powder, the forming mold also includes two plugs 6 fixed at both ends of the inner sleeve 1, each plug 6 includes a blocking cover 61 and an annular wall 62 fixed on the inner side of the blocking cover 61, the two ends of the core rod 3 are respectively embedded in the annular walls 62 of the corresponding plugs 6, the inner side walls at both ends of the inner sleeve 1 are provided with a first annular edge groove 11, and the outer wall of each annular wall 62 is connected to the inner wall of the corresponding first annular edge groove 11 by a thread.

[0025] The hot isostatic pressing mold of the present invention fixes the plugs 6 at both ends of the inner sleeve 1, and embeds the two ends of the core rod 3 into the annular walls 62 of the plug 6, so as to fix the core rod 3 and prevent the inner sleeve 1 from deforming and damaging the product structure. The plug 6 is then connected to the first annular edge grooves 11 at both ends of the inner sleeve 1 by threads, which makes it easy to disassemble the plug 6. The structure is simple and easy to use.

[0026] In this embodiment, positioning grooves 31 are provided at both ends of the middle part of the core rod 3, and positioning holes 63 are respectively provided at the positions of the positioning grooves 31 at both ends of the core rod 3 in the middle part of the two plugs 6. The molding mold also includes two positioning parts 7, and each positioning part 7 includes a first positioning portion 71 and a second positioning portion 72 integrally formed from the outside to the inside. The first positioning portion 71 cooperates with the positioning hole 63 and is embedded in the positioning hole 63, and the second positioning portion 72 cooperates with the positioning groove 31 and is embedded in the positioning groove 31. Specifically, the positioning groove 31 includes a truncated cone 311, a cylindrical groove 312, and a conical groove 313, which are sequentially connected from the outside to the inside. The inner diameter of the truncated cone 311 and the outer diameter of the conical groove 313 are both equal to the diameter of the cylindrical groove 312. The second positioning portion 72 includes a truncated cone 721, a cylindrical portion 722, and a conical portion 723, which are fixed sequentially from the outside to the inside. The inner diameter of the truncated cone 721 and the outer diameter of the conical portion 723 are both equal to the diameter of the cylindrical portion 722. This structure facilitates the positioning and fixing of the core rod 3.

[0027] In this embodiment, the length of the core rod 3 is greater than the length of the raw material chamber 5. The above-mentioned structure can ensure the supporting effect of the core rod 3.

[0028] In this embodiment, the outer side walls at both ends of the inner sleeve 1 are respectively provided with annular protrusions 12. The above-mentioned structure can be used to manufacture products with thinned ends.

[0029] In this embodiment, the outer wall of the annular projection 12 is formed with a second annular edge groove 13. The inner wall of each blocking ring 4 is inserted into the second annular edge groove 13 and welded to the inner wall of the outer sleeve 2. The outer wall of each blocking ring 4 is then welded to the inner wall of the outer sleeve 2. This structure facilitates the welding and fixing of the blocking ring 4, preventing the welding process from affecting the powder during sealing and avoiding high-pressure tearing welding.

[0030] In this embodiment, a first annular groove 14 is formed on the inner side of each of the first annular side grooves 11 .

[0031] In this embodiment, a second annular groove 41 is formed in the middle of the outer side of each blocking ring 4, and a third annular side groove 42 is formed on the outer edge of each blocking ring 4. The above-mentioned structure facilitates the welding of the plug 6.

[0032] In this embodiment, the inner edge of each plug 6 is provided with a chamfer 64. The above-mentioned structure is provided to facilitate the threaded assembly and disassembly of the plug 6.

[0033] In this embodiment, the forming mold further includes an exhaust pipe (not shown) connected to the raw material chamber 5. The exhaust pipe can be installed on the blocking ring 4 or on the side walls at both ends of the outer sleeve 2. The installation of the exhaust pipe can adjust the pressure in the raw material chamber 5.

[0034] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. A hot isostatic pressing mold, comprising an inner sleeve, an outer sleeve sleeved outside the inner sleeve, and a core rod sleeved within the inner sleeve, wherein the upper and lower ends of the inner sleeve and the outer sleeve are welded and fixed by blocking rings, and the inner sleeve, the outer sleeve, and the two blocking rings form a raw material cavity for accommodating powder, characterized in that: The forming mold also includes two plugs fixed at both ends of the inner sleeve respectively, each plug includes a plug cover and an annular wall fixed on the inner side of the plug cover, the two ends of the core rod are respectively embedded in the annular walls of the corresponding plugs, and the inner walls of both ends of the inner sleeve are provided with a first annular edge groove, and the outer wall of each annular wall is connected to the inner wall of the corresponding first annular edge groove by a thread.

2. The hot isostatic pressing mold according to claim 1, characterized in that: Positioning grooves are provided at both ends of the middle part of the core rod, and positioning holes are provided in the middle part of the two plugs corresponding to the positioning grooves at both ends of the core rod. The forming mold also includes two positioning parts, each of which includes a first positioning part and a second positioning part integrally formed from the outside to the inside, the first positioning part cooperates with the positioning hole and is embedded in the positioning hole, and the second positioning part cooperates with the positioning groove and is embedded in the positioning groove.

3. The hot isostatic pressing mold according to claim 2, characterized in that: The positioning groove includes a truncated cone groove, a cylindrical groove and a conical groove connected in sequence from the outside to the inside, and the inner diameter of the truncated cone groove and the outer diameter of the conical groove are both equal to the diameter of the cylindrical groove; the second positioning part includes a truncated cone part, a cylindrical part and a conical part fixed in sequence from the outside to the inside, and the inner diameter of the truncated cone part and the outer diameter of the conical part are both equal to the diameter of the cylindrical part.

4. The hot isostatic pressing mold according to claim 1, characterized in that: The length of the core rod is greater than the length of the raw material cavity.

5. The hot isostatic pressing mold according to claim 1, characterized in that: The outer side walls at both ends of the inner sleeve are respectively provided with annular protrusions protruding outwards.

6. The hot isostatic pressing mold according to claim 5, characterized in that: The outer wall of the annular protrusion is provided with a second annular edge groove, the inner wall of each blocking ring is embedded in the second annular edge groove and fixed by welding, and the outer wall of each blocking ring is attached to the inner wall of the outer sleeve and fixed by welding.

7. The hot isostatic pressing mold according to claim 1, characterized in that: A first annular groove is formed on the inner side of each of the first annular edge grooves.

8. The hot isostatic pressing mold according to claim 1, characterized in that: A second annular groove is provided on the middle portion of the outer side of each blocking ring, and a third annular side groove is provided on the outer edge of each blocking ring.

9. The hot isostatic pressing mold according to claim 1, characterized in that: The inner edge of each plug is provided with a chamfer.

10. The hot isostatic pressing mold according to claim 1, characterized in that: The forming die further includes an exhaust pipe communicated with the raw material cavity.

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