CN111195975A

CN111195975A - Ceramic waveguide filter blank forming die

Info

Publication number: CN111195975A
Application number: CN202010118126.4A
Authority: CN
Inventors: 陈荣达; 周旭辉
Original assignee: Suzhou Rf Top Electronic Communications Co ltd
Current assignee: Suzhou Rf Top Electronic Communications Co ltd
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-05-26

Abstract

The invention relates to a ceramic waveguide filter blank forming die, which comprises an upper die, a middle die, a lower die, a core rod and an inner punch; a die cavity is arranged in the middle die; the upper die and the lower die are respectively arranged right above and right below the middle die; the core rod sequentially penetrates through the upper die and the die cavity and extends into the lower die; the inner punch penetrates through the upper die or the lower die and extends into the die cavity; the upper die comprises an upper die base and an upper die punch which is arranged at the bottom of the upper die base and can extend into the die cavity; the lower die comprises a lower die base and a lower die punch which is arranged at the top of the lower die base and can extend into the die cavity; the upper die, the lower die, the core rod and the inner punch are respectively connected with a driver and can independently ascend or descend under the driving of the drivers; the invention can dry-press the through hole and the through groove through the core rod, can dry-press the blind hole and the blind groove through the inner punch, and can greatly improve the yield of the formed blank body.

Description

Ceramic waveguide filter blank forming die

Technical Field

The invention relates to the technical field of dry pressing forming, in particular to a forming die for a ceramic waveguide filter blank.

Background

The existing mould for pressing and forming the ceramic dielectric filter blank only comprises an upper mould, a middle mould, a lower mould and a core rod, and can only form a common structure, such as a single-hole or porous ceramic green body, but cannot dry-press and form a ceramic green body with a complex structure and a blind groove or blind hole; although molds with blind grooves or blind holes are available in the market, such as the waveguide filter blank forming mold and the process thereof disclosed in the prior art 2019103045420, the following problems exist: 1. the middle die, the upper die, the lower die, the upper die core rod and the lower die core rod are all connected with a driver, so that the driving process is complex, and the requirement on the driver is high; 2. as shown in the prior art drawings, the size of the upper die and the lower die extending into the die cavity is limited, which results in a large limitation on the size of the green compact to be formed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a ceramic waveguide filter blank forming die.

In order to achieve the purpose, the invention adopts the technical scheme that: a ceramic waveguide filter blank forming die comprises an upper die, a middle die, a lower die, a core rod and an inner punch; a die cavity is arranged in the middle die; the upper die and the lower die are respectively arranged right above and right below the middle die; the core rod sequentially penetrates through the upper die and the die cavity and extends into the lower die; the inner punch penetrates through the upper die or the lower die and extends into the die cavity; the upper die comprises an upper die base and an upper die punch which is arranged at the bottom of the upper die base and can extend into the die cavity; the lower die comprises a lower die base and a lower die punch which is arranged at the top of the lower die base and can extend into the die cavity; the upper die, the lower die, the core rod and the inner punch are respectively connected with a driver and can independently ascend or descend under the driving of the drivers.

Preferably, the length of the inner punch extending into the die cavity can be adjusted, so that the depth of a blind hole or a blind groove in the thickness direction of the corresponding blank can be adjusted.

Preferably, the length of the upper punch is not less than the height of the die cavity.

Preferably, the length of the lower punch is not less than the height of the die cavity.

Preferably, the core rod and the inner punch are both made of tungsten steel material.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the invention can dry-press the through hole and the through groove through the core rod, can dry-press the blind hole and the blind groove through the inner punch, can obviously improve the deformation problem of the ceramic green body in the sintering process, can obviously improve the high-end out-of-band inhibition of the finished product of the filter, and improves the product characteristics.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1 is a sectional view of a ceramic waveguide filter blank molding die according to the present invention;

FIG. 2 is a bottom view of the upper punch of the present invention;

fig. 3 is a schematic mechanism diagram of the blank body of the present invention.

Wherein: 1. a lower die; 11. a lower die holder; 12. punching a lower die; 2. a middle mold; 21. a mold cavity; 3. an upper die; 31. an upper die holder; 32. punching by an upper die; 4. a core rod; 5. performing inner punching; 6. a embryo body.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

Fig. 1-2 show a forming die for a ceramic waveguide filter blank according to the present invention, which comprises an upper die 3, a middle die 2, a lower die 1, a core rod 4, and an inner punch 5; a die cavity 21 is arranged in the middle die 2; the upper die 3 and the lower die 1 are respectively arranged right above and right below the middle die 2; the two core rods 4 are specially shaped and sequentially penetrate through the upper die 3 and the die cavity 21 to extend into the lower die 1; eight inner punches 5 are arranged, seven of the eight inner punches are round, and one inner punch is square and penetrates through the upper die 3 to extend into the die cavity 21; the upper die 3 comprises an upper die holder 31 and an upper punch 32 which is arranged at the bottom of the upper die holder 31 and can extend into the die cavity 21; the lower die 1 comprises a lower die base 11 and a lower punch 12 which is arranged at the top of the lower die base 11 and can extend into the die cavity 21; the upper die 3, the lower die 1, the two core rods 4 and the eight inner punches 5 are respectively connected with a driver and can independently ascend or descend under the driving of the drivers; when in work: the middle die 2 is fixedly arranged on a workbench of a dry pressing forming machine, and the upper die base 31, the lower die base 11, the core rod 4 and the inner punch 5 are respectively connected with a driving end of the dry pressing forming machine; wherein the top of the lower punch 12 extends into the die cavity 21 to plug the bottom of the die cavity 21, and the upper punch 32 is positioned right above the die cavity 21 and has a certain distance with the middle die 2; then, the dry pressing forming machine fills powder for pressing the blank body into the die cavity 21 of the middle die 2, drives the core rod 4 and the inner punch 5 to extend out of the bottom of the upper punch 32 respectively, drives the upper punch 32 to extend into the die cavity 21 to punch the powder, as shown in fig. 3, a blank body 6 is formed, and finally drives the upper punch 32 and the lower punch 1 to move upwards simultaneously, so that corner missing or fracture of the blank body 6 can be effectively prevented, after the top of the lower punch 12 is flush with the top of the middle die 2, the upper punch 32 continues to move upwards until the blank body returns to the initial position, and at the moment, the blank body 6 is positioned at the top of the middle die 2, so that a manipulator can conveniently grab the blank body 6; in addition, the number and the shape of the core rod 4 and the inner punch 5 depend on the actual design requirements of the formed blank body 6, and the length of the inner punch 5 extending into the die cavity 21 can be adjusted, so that the depth of the blind hole or the blind groove in the thickness direction of the corresponding blank body 6 can be adjusted.

Further, the length of the upper punch 32 is not less than the height of the die cavity 21, and the method is suitable for dry pressing of the thin blank 6.

Further, the length of the lower punch 12 is equal to the height of the die cavity 21, so that the blank 6 can be ejected out of the die cavity 21 and is flush with the top of the middle die 2.

Further, the core rod 4 and the inner punch 5 are both made of tungsten steel materials, so that the core rod 4 and the inner punch 5 are high in hardness, wear-resistant, good in strength and toughness, and long in service life.

The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims

1. A ceramic waveguide filter blank forming die comprises an upper die, a middle die, a lower die and a core rod; a die cavity is arranged in the middle die; the upper die and the lower die are respectively arranged right above and right below the middle die; the core rod sequentially penetrates through the upper die and the die cavity and extends into the lower die; the method is characterized in that: also comprises an inner punch; the inner punch penetrates through the upper die or the lower die and extends into the die cavity; the upper die comprises an upper die base and an upper die punch which is arranged at the bottom of the upper die base and can extend into the die cavity; the lower die comprises a lower die base and a lower die punch which is arranged at the top of the lower die base and can extend into the die cavity; the upper die, the lower die, the core rod and the inner punch are respectively connected with a driver and can independently ascend or descend under the driving of the drivers.

2. The ceramic waveguide filter blank molding die of claim 1, wherein: the length of the inner punch extending into the die cavity can be adjusted, so that the depth of a blind hole or a blind groove in the thickness direction of the corresponding blank can be adjusted.

3. The ceramic waveguide filter blank molding die according to claim 2, wherein: the length of the upper punch is not less than the height of the die cavity.

4. The ceramic waveguide filter blank molding die according to claim 2, wherein: the length of the lower punch is not less than the height of the die cavity.

5. The ceramic waveguide filter blank molding die according to any one of claims 1 to 4, wherein: the core rod and the inner punch are both made of tungsten steel materials.