CN212072347U

CN212072347U - Carbon-carbon composite material combined die for high-temperature hot-pressing precision ceramic sintering furnace

Info

Publication number: CN212072347U
Application number: CN202020634418.9U
Authority: CN
Inventors: 闫根程; 王毅楠; 陈捷; 范丽君
Original assignee: Yantai Luhang Carbon Materials Technology Co ltd
Current assignee: Yantai Luhang Carbon Materials Technology Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-12-04
Anticipated expiration: 2030-04-24

Abstract

The utility model relates to a hot pressing ceramic furnace mould technical field specifically is a carbon-carbon composite combined mould for high temperature hot pressing precision ceramic sintering furnace, including the formpiston of bed die and top grafting, the bed die is closely cup jointed by overcoat and the endotheca that carbon-carbon composite made and is formed, and overcoat and endotheca all are cylindricly, and the internal surface of overcoat and the outward appearance of endotheca are personally submitted 93 degrees to 95 degrees tapering, and the formpiston is from last to including down pressing the column cap, upward pressing conical head, first pressure head and second pressure head down. The utility model discloses a with former hot pressing die's the equal split preparation of bed die and formpiston idiosome, make the bed die fall into inside and outside cover box-like, adopt carbon cloth to twine into accurate three-dimensional carbon fiber acupuncture preform again with these built-up components alone to make through the fine and close method of chemical vapor deposition or resin impregnation carbomorphism after high temperature treatment, make preparation time shorten, make manufacturing cost reduce promptly indirectly.

Description

Carbon-carbon composite material combined die for high-temperature hot-pressing precision ceramic sintering furnace

Technical Field

The utility model relates to a hot pressing ceramic furnace mould technical field specifically is a carbon-carbon composite modular mold for high temperature hot pressing precision ceramic sintering stove.

Background

The high-temperature hot pressing process is a material forming method combining a die pressing process and high-temperature sintering, and particularly relates to a densification forming method for loosely packing metal, alloy or ceramic powder in a rigid female die made of graphite or carbon-carbon composite materials, applying pressure on a male die pressing head, and enabling the ceramic powder to generate plastic deformation at high temperature. Is commonly used for preparing hard alloy, diamond, silicon nitride and the like. Because the working temperature is high (more than or equal to 1600 ℃), the pressure is high (more than or equal to 60Mpa), so the hot-pressing process requires that the hot-pressing die material (containing a female die and a male die) has high temperature resistance, high-temperature tensile and compressive strength and strong thermal shock resistance. The high-strength and high-density graphite material for the traditional manufacturing die has lower mechanical properties (tensile strength, compression strength and breaking strength) and poorer thermal shock resistance, so that the die has thicker design thickness (the wall thickness is more than or equal to 100mm), occupies larger working space, reduces the effective charging amount of the product, and influences the production efficiency. Although carbon-carbon composite materials are used for replacing high-strength and high-density graphite to manufacture hot-pressing molds at present, in general, the density of a blank material for manufacturing the carbon-carbon molds is more than or equal to 1.60g/cm3, the wall thickness is 50-70 mm, long-time chemical vapor deposition or high-pressure impregnation densification process is required to be carried out to achieve the required density, hot isostatic pressing densification treatment is carried out to achieve the required requirement if necessary, and the production cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a carbon-carbon composite modular mold for high temperature hot pressing precision ceramic sintering furnace to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a carbon-carbon composite material combined die for a high-temperature hot-pressing precision ceramic sintering furnace comprises a female die and a male die inserted above the female die, wherein the female die is formed by tightly sleeving an outer sleeve and an inner sleeve which are made of carbon-carbon composite materials, the outer sleeve and the inner sleeve are cylindrical, the inner surface of the outer sleeve and the outer surface of the inner sleeve are in a taper degree of 93-95 degrees, the male die comprises an upper pressing column head, an upper pressing cone head, a first lower pressing head and a second lower pressing head from top to bottom, the upper pressing column head is in a cylindrical structure, positioning holes are formed in the centers of the upper end surface and the lower end surface, the upper half section of the upper pressing cone head is in a cylindrical structure, the lower half section of the upper pressing cone head is in a conical frustum structure, a concave hole is formed in the center of the top surface of the upper pressing cone head, positioning pins are inserted in the positioning holes and the concave holes, inserting, the structure and the size of the second lower pressing head are the same as those of the first lower pressing head, and the outer diameter of the positioning pin is larger than the inner diameter of the positioning hole, the concave hole and the jack.

Preferably, the contact surfaces of the upper pressing column head and the upper pressing cone head are bonded and fixed through adhesive, and the contact surfaces of the second lower pressing head and the first lower pressing head are bonded and fixed through adhesive.

Preferably, all components of the female die and the male die are made of carbon-carbon composite materials, blanks of all the components are made of iron materials, and carbon cloth is wound outside the components to form a quasi-three-dimensional carbon fiber needling preform.

Preferably, a large sleeve in a cylindrical structure is arranged between the upper pressing conical head and the first lower pressing head, and a sleeve hole penetrating through the bottom surface of the large sleeve is formed in the center of the top surface of the large sleeve.

Preferably, the circular concave table is arranged at the center of the bottom surface of the upper pressure cone head, a small pressure head is tightly clamped inside the concave table, and the bottom end of the small pressure head is tightly matched with the trepanning in an inserted manner.

Preferably, a tray is connected under the large sleeve, a boss which is tightly inserted into the sleeve hole is arranged at the center of the top surface of the tray, and a connecting hole which is inserted into the positioning pin is arranged at the center of the bottom surface of the tray.

Compared with the prior art, the beneficial effects of the utility model are that:

the carbon-carbon composite material combined die for the high-temperature hot-pressing precision ceramic sintering furnace is manufactured by splitting a female die and a male die blank of an original hot-pressing die, so that the female die is divided into an inner sleeve combination mode and an outer sleeve combination mode, the male die is divided into an upper pressing column head and an upper pressing cone head combination mode and a combination mode of two lower pressing heads, the combined components are independently wound into a quasi three-dimensional carbon fiber needling prefabricated body by adopting carbon cloth, and the quasi three-dimensional carbon fiber needling prefabricated body is manufactured by a chemical vapor deposition or resin impregnation carbonization compact method after high-temperature treatment, so that the preparation time is shortened, and the production cost is indirectly reduced.

Drawings

Fig. 1 is a schematic view of the overall assembly structure of the present invention;

fig. 2 is an exploded view of the female mold of the present invention;

FIG. 3 is a schematic structural view of the upper half of the male mold of the present invention;

FIG. 4 is a schematic structural view of the lower half part of the male mold of the present invention;

figure 5 is the structure diagram of the middle part of the male mold of the present invention.

The meaning of the individual reference symbols in the figures is:

1. a female die; 10. a jacket; 11. an inner sleeve; 2. a male mold; 20. pressing the column head; 200. positioning holes; 21. pressing the conical head upwards; 210. concave holes; 211. a concave platform; 22. a first lower ram; 220. a jack; 23. a second lower ram; 24. a large sleeve; 240. trepanning; 25. a small pressure head; 26. a tray; 260. a boss; 261. connecting holes; 3. and a positioning pin.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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 is to be understood that the terms "center", "center line", "longitudinal", "lateral", "length", "width", "thickness", "depth", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1-5, the present invention provides a technical solution:

the utility model provides a carbon-carbon composite combined die for high temperature hot pressing precision ceramic sintering furnace, includes bed die 1 and the formpiston 2 of grafting in top, installs bed die 1 on the press platform, installs formpiston 2 on the pneumatic cylinder piston rod of press platform top, and the press is current conventional technology with the installation of bed die 1 and formpiston 2, the utility model discloses in no longer describe repeatedly. Ceramic powder is arranged in the female die 1, the bottom end of the male die 2 is driven to be pressed into the female die 1 by electrifying a press, and the ceramic powder is stressed at high temperature to generate plastic deformation for molding. The female die 1 is formed by tightly sleeving an outer sleeve 10 and an inner sleeve 11 which are made of carbon-carbon composite materials, the wall thickness of the outer sleeve 10 and the wall thickness of the inner sleeve 11 are 25-35 mm, the diameter of the outer sleeve 10 and the diameter of the inner sleeve 11 are 300-700 mm, the height of the outer sleeve is 250-700 mm, and the density of a blank material is more than or equal to 1.60g/cm 3. The outer sleeve 10 and the inner sleeve 11 are both cylindrical, the inner surface of the outer sleeve 10 and the outer surface of the inner sleeve 11 are in a taper range from 93 degrees to 95 degrees, and machining allowance of 3-5 mm of inner and outer diameters is reserved so as to ensure good coaxiality matching of the outer sleeve 10 and the inner sleeve 11. The male die 2 comprises an upper pressing column head 20, an upper pressing cone head 21, a first lower pressing head 22 and a second lower pressing head 23 from top to bottom, and machining allowance with the outer diameter of 3-5 mm is reserved in the male die. The upper pressing column head 20 is of a cylindrical structure, the centers of the upper end face and the lower end face are provided with positioning holes 200, and the upper half section of the upper pressing cone head 21 is of a cylindrical structure and the lower half section of the upper pressing cone head is of a truncated cone structure. Concave hole 210 has been seted up at the top surface center of last pressure conical head 21, and locating pin 3 has all been pegged graft to the inside of locating hole 200 and concave hole 210. Jack 220 has all been seted up in the upper and lower terminal surface center department of first lower pressure head 22, and the inside of two jack 220 is all pegged graft and is had locating pin 3. The structure and the size of second indenter 23 and first indenter 22 are all the same down, and the external diameter of locating pin 3 is greater than the internal diameter of locating hole 200, shrinkage pool 210 and jack 220 for cooperate for interference fit each other, increase the fastness of complex.

Further, the contact surfaces of the upper pressing column head 20 and the upper pressing cone head 21 are bonded and fixed by adhesive, and the contact surfaces of the second lower pressing head 23 and the first lower pressing head 22 are bonded and fixed by adhesive, so that the two parts are firmly combined into a whole.

Specifically, all components of the female die 1 and the male die 2 are made of carbon-carbon composite materials, blanks of all the components are made of iron materials, carbon cloth is wound outside the components to form a quasi-three-dimensional carbon fiber needling preform, and the quasi-three-dimensional carbon fiber needling preform is subjected to high-temperature treatment and is prepared by a chemical vapor deposition or resin impregnation carbonization densification method. The carbon-carbon composite material has the characteristics of high-temperature strength, good thermal shock resistance, high reliability, high efficiency, low energy consumption and the like, and the tensile strength is generally 50-70 Mpa, the breaking strength is generally 80-100 Mpa, and the compression strength is generally 100-120 Mpa.

Specifically, a large sleeve 24 in a cylindrical structure is arranged between the upper pressing cone head 21 and the first lower pressing head 22, a sleeve hole 240 penetrating through the bottom surface of the large sleeve 24 is formed in the center of the top surface of the large sleeve 24, and the large sleeve 24 is manufactured in the same way as the female die 1 and the male die 2.

In addition, the bottom center of the upper pressing conical head 21 is provided with a circular concave table 211, a small pressing head 25 is tightly clamped inside the concave table 211, the bottom end of the small pressing head 25 is tightly inserted and matched with the sleeve hole 240, so that the upper half part of the male die 2 and the large sleeve 24 are combined into a whole, and the manufacturing method of the small pressing head 25 is the same as that of the female die 1 and the male die 2.

It should be added that the tray 26 is connected right below the large sleeve 24, the boss 260 tightly inserted into the sleeve hole 240 is arranged at the center of the top surface of the tray 26, the connecting hole 261 inserted into the positioning pin 3 is arranged at the center of the bottom surface of the tray 26, the positioning pin 3 is the positioning pin 3 at the top of the first lower pressing head 22, so that the lower half part of the male mold 2, the large sleeve 24 and the tray 26 are combined into a whole, and the manufacturing method of the tray 26 is the same as that of the female mold 1 and the male mold 2.

When the carbon-carbon composite material combined mould for the high-temperature hot-pressing precision ceramic sintering furnace is manufactured, the female mould 1 and the male mould 2 are all made of carbon-carbon composite material, the method comprises the steps of winding carbon cloth into a quasi-three-dimensional carbon fiber needling preform, then carrying out a chemical vapor deposition or resin impregnation carbonization densification method to obtain the preform, pressing and combining the processed inner sleeve 11 and the processed outer sleeve 10 on a press under the pressure of 10Mpa to form a whole to form a female die 1, placing an upper pressing column head 20, an upper pressing cone head 21, a small pressing head 25, a large sleeve 24, a tray 26, a first lower pressing head 22 and a second lower pressing head 23 on the press from top to bottom, pressing and combining the upper pressing column head, the upper pressing cone head 21, the small pressing head 25, the large sleeve 24, the first lower pressing head 22 and the second lower pressing head 23 to form a whole to form a male die 2 under the pressure of 10Mpa, and.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A carbon-carbon composite material combined mould for a high-temperature hot-pressing precision ceramic sintering furnace is characterized in that: including bed die (1) and male die (2) of grafting above thereof, bed die (1) is closely cup jointed by overcoat (10) and endotheca (11) that carbon-carbon composite made, overcoat (10) with endotheca (11) all are cylindricly, the internal surface of overcoat (10) with the outward appearance of endotheca (11) is 93 degrees to 95 degrees tapering, male die (2) is from last to including last column cap (20), last pressure cone head (21), first pressure head (22) and second pressure head (23) down, last pressure column cap (20) are the cylinder structure and upper and lower terminal surface center department all seted up locating hole (200), the first section of last pressure cone head (21) is the cylinder structure and the second section is the circular cone structure, shrinkage pool (210) has been seted up to the top surface center of last pressure cone head (21), locating hole (200) with locating pin (3) have all been pegged graft to the inside of shrinkage pool (210), jack (220) have all been seted up in the upper and lower terminal surface center department of first indenter (22), two the inside of jack (220) is all pegged graft and is had locating pin (3), second indenter (23) with the structure and the size of first indenter (22) are all the same down, the external diameter of locating pin (3) is greater than locating hole (200) shrinkage pool (210) with the internal diameter of jack (220).

2. The carbon-carbon composite material combined mold for the high-temperature hot-pressing precision ceramic sintering furnace according to claim 1, characterized in that: the contact surface of the upper pressing column head (20) and the upper pressing cone head (21) is bonded and fixed through adhesive, and the contact surface of the second lower pressing head (23) and the first lower pressing head (22) is bonded and fixed through adhesive.

3. The carbon-carbon composite material combined mold for the high-temperature hot-pressing precision ceramic sintering furnace according to claim 1, characterized in that: all components of the female die (1) and the male die (2) are made of carbon-carbon composite materials, blanks of all the components are made of iron materials, and carbon cloth is wound outside the components to form a quasi-three-dimensional carbon fiber needling preform.

4. The carbon-carbon composite material combined mold for the high-temperature hot-pressing precision ceramic sintering furnace according to claim 1, characterized in that: a large sleeve (24) in a cylindrical structure is arranged between the upper pressing conical head (21) and the first lower pressing head (22), and a sleeve hole (240) penetrating through the bottom surface of the large sleeve (24) is formed in the center of the top surface of the large sleeve.

5. The carbon-carbon composite material combined mold for the high-temperature hot-pressing precision ceramic sintering furnace according to claim 4, characterized in that: go up the bottom surface center of pressing conical head (21) and seted up circular shape concave station (211), the inside inseparable joint of concave station (211) has little pressure head (25), the bottom of little pressure head (25) with trepanning (240) closely peg graft the cooperation.

6. The carbon-carbon composite material combined mold for the high-temperature hot-pressing precision ceramic sintering furnace according to claim 5, characterized in that: a tray (26) is connected under the large sleeve (24), a boss (260) tightly inserted into the sleeve hole (240) is arranged at the center of the top surface of the tray (26), and a connecting hole (261) inserted into the positioning pin (3) is formed in the center of the bottom surface of the tray (26).