CN219144020U

CN219144020U - Ceramic shell forming isostatic pressing die for vacuum arc extinguishing chamber

Info

Publication number: CN219144020U
Application number: CN202222555306.6U
Authority: CN
Inventors: 张溶凯; 曹李红; 高乐文; 杨桦
Original assignee: Shaanxi Baoguang Ceramic Science Technology Co ltd
Current assignee: Shaanxi Baoguang Ceramic Science Technology Co ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2023-06-06
Anticipated expiration: 2032-09-26

Abstract

The utility model relates to the technical field of vacuum arc-extinguishing chamber production, in particular to a ceramic shell forming isostatic pressing die for a vacuum arc-extinguishing chamber, which comprises a cylindrical die sleeve and a cylindrical die core positioned in the die sleeve, wherein the die core comprises a cover plate, an upper die core and a lower die core which are concentrically arranged from top to bottom, the cover plate is connected with the top of the upper die core, the bottom of the upper die core and the top of the lower die core are arranged in a conical surface matching mode in a gapless parallel manner, a bolt connecting rod is arranged between the upper die core and the lower die core, and the bolt connecting rod penetrates through the bottom of the upper die core and is in threaded connection with the lower die core. According to the utility model, the upper mold core and the lower mold core which are arranged in a clearance-free parallel manner in a conical surface matching manner are arranged, fastening is realized by utilizing the bolt connecting rod, and the die is used for pressing the blank after assembly to press the inner table of the belt at one time.

Description

Ceramic shell forming isostatic pressing die for vacuum arc extinguishing chamber

Technical Field

The utility model relates to the technical field of vacuum arc-extinguishing chamber production, in particular to a ceramic shell forming isostatic pressing die of a vacuum arc-extinguishing chamber.

Background

The vacuum arc-extinguishing chamber is a core component of a medium-high voltage power switch and is widely applied to the high-voltage power transmission and transformation industry, and the metallized ceramic shell is one of key parts of the vacuum arc-extinguishing chamber. The arc extinguishing chamber metallized ceramic shell is produced, processed and formed by alumina ceramic, and is widely applied in the electric power industry and the switch industry due to the excellent electric, thermal and mechanical properties. The current production process of the alumina porcelain shell comprises powder preparation, compression molding, turning and high-temperature sintering molding, wherein the compression molding method comprises dry type isostatic pressing, wet type isostatic pressing, gel film injection molding and the like, and the wet type isostatic pressing is commonly adopted at present for pressing the alumina porcelain shell.

The isostatic traditional mould structure for alumina ceramic molding in the prior art consists of a metal mould core, a rubber mould sleeve and an upper rubber plug and a lower rubber plug. The metal mold cores are respectively sleeved in the inner holes of the rubber plugs, the rubber mold sleeves are sleeved on the outer diameters of the rubber plugs, powder is filled into the mold, and then the upper and lower rubber plugs are tied by the rubber belt for sealing. The blank pressed by the die structure is a circular blank, an inner table of the alumina porcelain shell cannot be directly pressed, the inner table part is required to meet the drawing requirement after the excessive part material of the inner diameter is machined, and then kiln-loading sintering is carried out to form porcelain. The aluminum oxide ceramic inner table is a metal porcelain shell metalized sealing surface, and the requirements on the size consistency and the tolerance of the inner table are stricter along with the improvement of the requirements on the aluminum oxide porcelain shell. At present, a ceramic inner table of domestic factories mainly adopts blank half turning or full turning machining, and in the turning process, a blank needs to be clamped on a lathe for the second time, and if the strength of the blank is lower, the blank is easy to crack. Meanwhile, because the inner table of the blank is manually turned, under the conditions of measuring technique or lathe tool abrasion, the dimension deviation of the inner table is easy to cause, the consistency is poor, the inner diameter machining quality is rough, and the finish degree is not as good as that of the die pressed blank, and the manual blank trimming treatment is needed.

Disclosure of Invention

Aiming at the problem of rough quality of a porcelain shell inner platform in the prior art, the utility model provides a porcelain shell forming isostatic pressing die for a vacuum arc-extinguishing chamber.

The utility model is realized by the following technical scheme:

the utility model provides a vacuum interrupter porcelain shell shaping isostatic pressing mould, includes cylindric die sleeve and is located the cylindric mold core of die sleeve inside, the mold core includes the apron, the last mold core and the lower mold core of from the top down concentric setting, the apron is connected with the top of last mold core, adopt conical surface cooperation mode zero clearance parallel placement between the bottom of going up the mold core and the top of lower mold core, be provided with the bolt connecting rod between last mold core and the lower mold core, the bolt connecting rod runs through the bottom of going up the mold core and lower mold core threaded connection.

Preferably, the lower mold core is provided with a top mold parting surface, a step end surface, a mold core bottom surface and a mold sleeve bottom surface from top to bottom in sequence, the bottom of the upper mold core is provided with a lower end mold parting surface, and the lower end mold parting surface is assembled with the top mold parting surface in a conical surface mode.

Preferably, a conical matching hole is formed in the parting surface of the top die, a conical matching boss is arranged on the parting surface of the lower end die, and the conical matching hole is matched with the conical matching boss.

Preferably, the angle of the tapered mating hole is 2 °.

Preferably, the lower end die parting surface is provided with a step inclined surface, the lower die core is provided with a step end surface, and the step inclined surface is concentric with the step end surface and has the same size.

Preferably, a weight-reducing concave hole is formed in the upper mold core.

Preferably, the die sleeve is concentric with the die core.

Preferably, a clamp is further arranged on the outer side of the die sleeve, and the clamp is sleeved into the bottom of the die sleeve to be fastened and keep the die sleeve concentric with the die core.

Preferably, the cover plate is provided with an assembly concave hole, and one end of the upper mold core, which is close to the cover plate, is embedded in the assembly concave hole.

Preferably, a base is arranged at the bottom of the lower mold core, the outer diameter of the base is the same as the inner diameter of the mold sleeve, and the outer diameter of the base is the same as the outer diameter of the cover plate.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model relates to a ceramic shell forming isostatic pressing die for a vacuum arc-extinguishing chamber, which comprises an upper die core and a lower die core which are designed in a split mode, wherein the upper die core and the lower die core are assembled, and then the die presses a blank to form an inner table in one pressing zone. The bolt connecting rod fastens the upper mold core and the lower mold core, and ensures that the upper mold core and the lower mold core are parallel and compact in matching.

After the die is pressed and formed, the bolt connecting rod is removed, the upper die core can be taken out upwards, and the blank is vertically taken out to finish the one-time pressing and forming of the blank inner table.

The inner table is arranged in the middle of the pressed blank, so that a secondary turning link of the inner diameter of the blank is omitted, and the turning efficiency is improved. Meanwhile, the strength of the inner table of the pressed blank is improved, the turning cracking proportion in the process is reduced, the surface finish degree and the size of the inner diameter are ensured by a die, the consistency of the inner diameter quality and the inner table size is improved obviously, the qualification rate of the blank is improved by more than 10%, and the one-time utilization rate of the blank with the inner table is more than 30%.

Further, the upper mold core and the lower mold core are precisely matched with each other through the middle 2-degree taper surface to be concentrically and vertically aligned, and meanwhile, the upper mold is conveniently taken off in the later period.

Further, the clamp is used for fixing the matching position of the sealing die sleeve and the metal cover plate.

Drawings

FIG. 1 is a cross-sectional view of a ceramic shell forming isostatic pressing die for a vacuum arc extinguishing chamber;

FIG. 2 is a cross-sectional view of the lower mold core;

FIG. 3 is a cross-sectional view of the upper mold core.

In the figure, 1, an upper mold core; 2. a lower mold core; 3. a cover plate; 4. a bolt connecting rod; 5. a die sleeve; 6. a top mold parting surface; 7. a step end surface; 8. a bottom surface of the mold core; 9. the bottom surface of the die sleeve; 10. a tapered mating hole; 11. step inclined plane; 12. a lower end die parting surface; 13. and the conical matching boss.

Detailed Description

The utility model will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the utility model.

The utility model discloses a ceramic shell forming isostatic pressing die for a vacuum arc-extinguishing chamber, which comprises a cylindrical die sleeve 5 and a cylindrical die core positioned in the die sleeve 5, wherein the die sleeve 5 and the die core are concentrically arranged, a clamp is further arranged on the outer side of the die sleeve 5, the clamp is sleeved on the bottom of the die sleeve 5 and fastened, the die sleeve 5 and the die core are kept concentric, the die sleeve 5 is made of a rubber material, the die core is made of a metal material, and the clamp is made of a stainless steel material.

The mold core comprises a cover plate 3, an upper mold core 1 and a lower mold core 2 which are matched from top to bottom in sequence and are concentrically arranged, the outer diameter of the lower mold core 2 is identical to that of the upper mold core 1, the upper mold core 1 and the lower mold core 2 are arranged in a zero clearance parallel manner in a conical surface matching mode, and a bolt connecting rod 4 is arranged for reinforcement. The metal lower mold core 2 with the base is fixedly matched with the metal upper mold core by using the bolt connection.

The cover plate 3 is connected with the top of the upper mold core 1, an assembly concave hole is formed in the cover plate 3, and one end, close to the cover plate 3, of the upper mold core 1 is embedded into the assembly concave hole.

The bottom of the upper mold core 1 and the top of the lower mold core 2 are placed in a zero clearance parallel manner in a conical surface matching manner, and referring to fig. 2, the lower mold core 2 is sequentially provided with a top mold parting surface 6, a step end surface 7, a mold core bottom surface 8 and a mold sleeve bottom surface 9 from top to bottom, the bottom of the upper mold core 1 is provided with a lower end mold parting surface 12, and the lower end mold parting surface 12 is assembled with the top mold parting surface 6 in a conical surface manner.

The top die parting surface 6 is provided with a conical matching hole 10, the lower end die parting surface 12 is provided with a conical matching boss 13, the conical matching hole 10 is matched with the conical matching boss 13, and the angle of the conical matching hole 10 is 2 degrees.

Referring to fig. 3, a step inclined surface 11 is provided on the lower end mold parting surface 12, the lower mold core 2 is provided with a step end surface 7, and the step inclined surface 11 is concentric with the step end surface 7 and has the same size.

A bolt connecting rod 4 is arranged between the upper die core 1 and the lower die core 2, and the bolt connecting rod 4 penetrates through the bottom of the upper die core 1 and is in threaded connection with the lower die core 2.

The upper mold core 1 is internally provided with a weight-reducing concave hole, and the bottom surface of the weight-reducing concave hole is provided with an M16 threaded hole and a phi 14 through hole.

The bottom of the lower mold core 2 is provided with a base, the outer diameter of the base is the same as the inner diameter of the mold sleeve 5, and the outer diameter of the base is the same as the outer diameter of the cover plate 3.

According to the utility model, the upper mold core 1 and the lower mold core 2 which are arranged in a clearance-free parallel manner in a conical surface matching manner are arranged, fastening is realized by utilizing the bolt connecting rod 4, and the blank is pressed by the mold after assembly to form the primary pressing inner table, so that the problem that the conventional isostatic pressing mold cannot be formed by primary pressing when the aluminum oxide ceramic shell of the primary pressing inner table is oxidized and needs to be turned by a secondary lathe is solved. The blank in the secondary turning machining is easy to crack, the size of the inner table is controlled, the inner diameter turning quality is unstable, the primary utilization rate of raw materials is low, the turning efficiency is low, and the like. The structure of the existing die is improved, one-step forming of the inner diameter inner table is realized, the processing quality and the processing efficiency of the aluminum oxide blank are improved, and the raw material utilization rate of the product is improved.

The foregoing description of the preferred embodiment of the present utility model is not intended to limit the technical solution of the present utility model in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present utility model, and these modifications and substitutions are also included in the protection scope of the claims.

Claims

1. The utility model provides a vacuum interrupter porcelain shell shaping isostatic compaction mould, its characterized in that, including cylindric die sleeve (5) and be located the cylindric mold core of die sleeve (5), the mold core includes apron (3), last mold core (1) and lower mold core (2) of concentric setting from the top down, apron (3) are connected with the top of last mold core (1), adopt conical surface cooperation mode zero clearance parallel placement between the bottom of going up mold core (1) and the top of lower mold core (2), be provided with bolt connecting rod (4) between last mold core (1) and lower mold core (2), bolt connecting rod (4) run through the bottom of going up mold core (1) and lower mold core (2) threaded connection.

2. The ceramic shell forming isostatic pressing die for the vacuum arc extinguishing chamber according to claim 1, wherein the lower die core (2) is sequentially provided with a top die parting surface (6), a step end surface (7), a die core bottom surface (8) and a die sleeve bottom surface (9) from top to bottom, the bottom of the upper die core (1) is provided with a lower die parting surface (12), and the lower die parting surface (12) is assembled with the top die parting surface (6) in a conical surface mode.

3. The ceramic shell forming isostatic pressing die for the vacuum arc extinguishing chamber according to claim 2, wherein a conical matching hole (10) is formed in the top die parting surface (6), a conical matching boss (13) is formed in the lower end die parting surface (12), and the conical matching hole (10) is matched with the conical matching boss (13).

4. A vacuum interrupter porcelain shell forming isostatic mould according to claim 3, wherein the angle of the conical mating hole (10) is 2 °.

5. The ceramic shell forming isostatic pressing die for the vacuum arc extinguishing chamber according to claim 2, wherein a step inclined surface (11) is arranged on a parting surface (12) of the lower end die, the lower die core (2) is provided with a step end surface (7), and the step inclined surface (11) is concentric with the step end surface (7) and has the same size.

6. The ceramic shell forming isostatic pressing die for the vacuum arc extinguishing chamber according to claim 1, wherein a weight-reducing concave hole is formed in the upper die core (1).

7. The vacuum interrupter porcelain shell shaping isostatic pressing die according to claim 1, wherein the die sleeve (5) is concentric with the die core.

8. The ceramic shell forming isostatic pressing die for the vacuum arc-extinguishing chamber according to claim 1, wherein a clamp is further arranged on the outer side of the die sleeve (5), and the clamp is sleeved into the die sleeve (5) after being fastened at the bottom and keeps the die sleeve (5) concentric with the die core.

9. The ceramic shell forming isostatic pressing die for the vacuum arc extinguishing chamber according to claim 1, wherein the cover plate (3) is provided with an assembling concave hole, and one end of the upper die core (1) close to the cover plate (3) is embedded in the assembling concave hole.

10. The ceramic shell forming isostatic pressing die of a vacuum arc-extinguishing chamber according to claim 1, wherein a base is arranged at the bottom of the lower die core (2), the outer diameter of the base is the same as the inner diameter of the die sleeve (5), and the outer diameter of the base is the same as the outer diameter of the cover plate (3).