CN112092144A

CN112092144A - One-step forming die for pressing inner hole of high-voltage electric porcelain blank

Info

Publication number: CN112092144A
Application number: CN202010830188.8A
Authority: CN
Inventors: 虞育号; 刘志勇
Original assignee: Nanjing Zhida Electric Equipment Co ltd
Current assignee: Nanjing Zhida Electric Equipment Co ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-12-18

Abstract

The invention discloses a one-step forming die for pressing an inner hole of a high-voltage electric porcelain blank, wherein a core rod is inserted into a rubber sleeve, the core rod is fixedly connected with the rubber sleeve through a pressing plate, a closed die cavity is formed between the core rod and the rubber sleeve, the core rod is of a hollow structure with a sealed upper end and an open lower end, and an exhaust nozzle is communicated with an inner cavity of the core rod. The forming die can directly obtain a cylindrical blank with an inner hole with accurate size without continuously processing until the size is qualified; the inner hole of the blank adopts a hard core die made of steel, so that the problem of complex equipment for processing the inner hole of the blank is effectively solved, and meanwhile, the size accuracy of the inner hole is obviously improved and the sizes of all products are ensured to be consistent as the inner hole of the blank is formed by pressing; the problem of the repeatability of the size parallelism of the inner hole in the electroceramic manufacturing process is perfectly solved; because the inner hole is formed by one-step pressing, the material consumption is obviously reduced, about 15 percent of powder can be saved, and energy, manpower and the like consumed by powder preparation are obviously reduced.

Description

One-step forming die for pressing inner hole of high-voltage electric porcelain blank

The technical field is as follows:

the invention relates to a one-step forming die for pressing an inner hole of a high-voltage electric porcelain blank.

Background art:

the dry process for high-voltage electric porcelain is mainly characterized by that various raw materials are mixed with water to obtain slurry, and after the slurry is atomized, the slurry is dehydrated with hot air so as to obtain powder material. The powder is put into a rubber bag, a bound opening is put into a high-pressure container, liquid is continuously injected into the isostatic pressure container to press the powder into a cylindrical blank with certain strength, the rubber bag belongs to a soft mold, the shape of the cylindrical blank is not very regular, a lathe is needed for processing, and the processing of the outer edge can be finished by a common vertical machine tool; however, deep boring is needed for processing the inner hole, requirements on equipment, a cutter and a cutter bar are high, the longest extension of the cutter reaches 4000mm, so that the processing size cannot be accurate, the processing surface is rough, and cracks are easily generated after subsequent glazing.

The invention content is as follows:

the invention provides a one-step forming die for pressing an inner hole of a high-voltage electric porcelain blank in order to solve the problems in the prior art.

The technical scheme adopted by the invention is as follows: the utility model provides a be used for high-voltage electroceramics blank hole suppression one shot forming mould, includes plug, clamp plate, rubber sleeve and exhaust nozzle, the plug is pegged graft in the rubber sleeve, and passes through clamp plate fixed connection between plug and the rubber sleeve, forms inclosed die cavity between plug and the rubber sleeve, and the plug is sealed, lower extreme open-ended cavity formula structure in the upper end, and the exhaust nozzle is linked together with the inner chamber of plug.

Furthermore, a through hole is formed in the circle center direction of the pressing plate, and the through hole in the pressing plate is communicated with the lower port of the core rod.

Further, the rubber sleeve includes a rubber tube, a rubber cap and a supporting sleeve ring, the rubber tube is of an upper and lower both-end open structure, the lower end of the rubber tube is fixedly connected to the bottom end face of the core rod through a pressing plate, the supporting sleeve ring is sleeved on the outer side of the upper end opening of the rubber tube, the rubber cap is sleeved on the supporting sleeve ring, and the rubber tube, the supporting sleeve ring and the rubber cap are fastened and fixedly sealed through a fixing rope.

Furthermore, an exhaust pipe is arranged in an inner cavity of the core rod, and an exhaust nozzle penetrates through the pressing plate and is connected with the exhaust pipe in a sealing mode.

Furthermore, the top end of the core rod is provided with a lifting hole.

The invention has the following beneficial effects:

1) the forming die can be used for directly obtaining a cylindrical blank with an inner hole, namely the inner hole of the blank adopts a hard core die made of steel, so that the problem of complex equipment for processing the inner hole of the blank is effectively solved, and meanwhile, the size accuracy of the inner hole is obviously improved and the sizes of all products are ensured to be consistent as the inner hole of the blank is formed by pressing; the problem of the repeatability of the size parallelism of the inner hole in the electroceramic manufacturing process is perfectly solved; because the inner hole is formed by one-step pressing, the material consumption is obviously reduced, about 15 percent of powder can be saved, and energy, manpower and the like consumed by powder preparation are obviously reduced.

2) The forming die can lead pressure medium (emulsion) into the die with the inner core structure of the die, can overcome the defects that the pressure in an isostatic pressing cylinder is 100MPa and the die is not deformed, has smooth surface and no sticking to the die, and has convenient demoulding, accurate size and compact and firm blank body; compared with the traditional isostatic pressing dry method molding hollow insulator inner hole rubber mold, the method has the technical scheme of rough molding and then internal boring processing molding; energy and raw materials are saved; the inner imitation mechanism for processing the inner hole by the equipment is cancelled, the structure of the equipment is greatly simplified, and meanwhile, the problems of small cutting amount, long processing time and inaccurate size can be solved due to the boring processing of the long inner hole long rod.

Description of the drawings:

FIG. 1 is a block diagram of the present invention.

Fig. 2 is a partially enlarged view of the present invention.

Fig. 3 is an exploded view of the installation of the mandrel, platen and exhaust nozzle in the forming die.

Fig. 4 and 5 are views showing an assembly application of the molding die.

The specific implementation mode is as follows:

the invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 to 3, the inner hole pressing one-step forming die for the high-voltage electric porcelain blank comprises a core rod 11, a pressing plate 12, a rubber sleeve 13 and an exhaust nozzle 14, wherein the core rod 11 is inserted into the rubber sleeve 13, the core rod 11 is fixedly connected with the rubber sleeve 13 through the pressing plate 12, a closed die cavity 10 is formed between the core rod 11 and the rubber sleeve 13, powder for manufacturing electric porcelain is poured into the die cavity 10, and the exhaust nozzle 14 is communicated with an inner cavity of the core rod 11.

The core rod 11 is a hollow structure with a sealed upper end and an open lower end, a through hole is arranged in the direction of the circle center of the pressing plate 12, and the through hole on the pressing plate 12 is communicated with the lower end opening of the core rod 11. The through holes in the pressure plate 12 allow the pressurized liquid medium (emulsion) to flow into the interior of the mandrel to prevent the mandrel from collapsing.

The rubber sleeve 13 of the invention comprises a rubber tube 131, a rubber cap 132 and a supporting lantern ring, wherein the upper end and the lower end of the rubber tube 131 are both open, and the lower end of the rubber tube 131 is fixedly connected to the bottom end face of the core rod 11 through a pressing plate 12. To ensure the sealing effect, sealing rings are provided between the pressure plate 12 and the rubber tube 131 and between the rubber tube 131 and the mandrel 11. The lower end face of the rubber sleeve 13 and the lower end face of the core rod 11 are pressed by a pressing plate to prevent a pressurizing medium from entering a die cavity 10 in a forming die.

The supporting sleeve is sleeved outside the upper port of the rubber cylinder 131 (the supporting ring is not shown in fig. 1) to play a supporting role, the rubber cap 132 is sleeved on the supporting sleeve, and the rubber cylinder 131, the supporting sleeve and the rubber cap 132 are fastened, fixed and sealed through a fixing rope.

An exhaust pipe 111 is arranged in the inner cavity of the mandrel 11, and an exhaust nozzle 14 penetrates through the pressure plate 12 and is connected with the exhaust pipe 111 in a sealing mode.

To facilitate the transfer of the core rod 11, a lifting hole 113 is provided at the top end of the core rod 11. During the transfer of the mandrel 11, the lifting eye 18 is screwed into the lifting hole 113. The top end of the core rod 11 is reserved with a hanging ring hole, so that the core rod is convenient to use, and is blocked by a sealing head screw in the powder filling and pressurizing process.

In use, with reference to fig. 4 and 5, the core rod 11 and the rubber cylinder 131 are lifted by the lifting ring and placed into the basket 100, the pressing plate 12 is made to fall into the bottom plate groove of the basket, and then powder for making electroceramics is added into the mold cavity 10 between the core rod 11 and the rubber cylinder 131. After filling with the tap, the cap 132 is covered and sealed, and the air duct 110 is connected to the air outlet 14.

In the process of pressurizing by transferring the forming die filled with powder into an isostatic press, the gas inside the core rod 11 is removed as the pressurizing medium gradually flows into the core rod 11, and when the inner cavity of the core rod 11 is completely filled with the pressurizing medium, the air in the inner cavity of the core rod 11 is completely discharged through the air duct 110.

The pressurized medium is continuously pumped into the cylinder until the pressure reaches a set value, the core rod 11 is hollow, and the pressure transmission medium is guided to flow into the core rod, so that the core rod is prevented from being collapsed due to high pressure.

The core rod 11 is provided with an exhaust nozzle 14 communicated with the inner cavity of the core rod, so that the potential safety hazard caused by the fact that gas inside the core rod is sealed by liquid and then compressed can be prevented, a metal exhaust pipe 111 is arranged inside the core rod, and an external hose (an air guide pipe 110) is connected to lead the gas out to a pressurized liquid page until the inside of the core rod is filled with the liquid.

After the pressurization is completed, the pressurized medium is discharged, the pressure of the isostatic press is reduced to atmospheric pressure, the rubber cap 132 is uncovered, and the press-formed blank is taken out for the next processing step.

The forming die can be used for directly obtaining a cylindrical blank with an inner hole, namely the inner hole of the blank adopts a hard core die made of steel, so that the problem of complex equipment for processing the inner hole of the blank is effectively solved, and meanwhile, the size accuracy of the inner hole is obviously improved and the sizes of all products are ensured to be consistent as the inner hole of the blank is formed by pressing; the problem of the repeatability of the size parallelism of the inner hole in the electroceramic manufacturing process is perfectly solved; because the inner hole is formed by one-step pressing, the material consumption is obviously reduced, about 15 percent of powder can be saved, and energy, manpower and the like consumed by powder preparation are obviously reduced.

The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.

Claims

1. The utility model provides a be used for hole suppression one shot forming mould of high-voltage electric porcelain blank which characterized in that: the core rod assembly comprises a core rod (11), a pressing plate (12), a rubber sleeve (13) and an exhaust nozzle (14), wherein the core rod (11) is inserted into the rubber sleeve (13), the core rod (11) and the rubber sleeve (13) are fixedly connected through the pressing plate (12), a closed die cavity (10) is formed between the core rod (11) and the rubber sleeve (13), the core rod (11) is of a hollow structure with the upper end sealed and the lower end open, and the exhaust nozzle (14) is communicated with an inner cavity of the core rod (11).

2. The one-step forming die for pressing the inner hole of the high-voltage electric porcelain blank as claimed in claim 1, wherein: and a through hole is formed in the circle center direction of the pressing plate (12), and the through hole in the pressing plate (12) is communicated with the lower port of the core rod (11).

3. The one-step forming die for pressing the inner hole of the high-voltage electric porcelain blank as claimed in claim 1, wherein: rubber sleeve (13) include rubber tube (131), rubber cap (132) and support the lantern ring, rubber tube (131) are the equal open type structure in both ends from top to bottom, and the lower extreme of rubber tube (131) passes through clamp plate (12) fixed connection on the bottom face of plug (11), supports the cover ring cover and establishes in the upper port outside of rubber tube (131), and rubber cap (132) cover is established on supporting the lantern ring, tightens fixed seal through fixed rope between rubber tube (131), the support lantern ring and rubber cap (132).

4. The one-step forming die for pressing the inner hole of the high-voltage electric porcelain blank as claimed in claim 1, wherein: an exhaust pipe (111) is arranged in an inner cavity of the core rod (11), and an exhaust nozzle (14) penetrates through the pressing plate (12) and is connected with the exhaust pipe (111) in a sealing mode.

5. The one-step forming die for pressing the inner hole of the high-voltage electric porcelain blank as claimed in claim 1, wherein: the top end of the core rod (11) is provided with a lifting hole (113).