Dry-pressing forming die for aluminum oxide ceramic sealing test standard part green body

Abstract

The utility model discloses an aluminum oxide ceramic sealing test standard part green body dry pressing forming die which comprises a variable-diameter cylindrical positioning rod fixing die, a variable-diameter cylindrical positioning rod, a circular ring inner concave petal die, a cylindrical outer die, a circular ring gasket die, a circular ring column ejector rod and a die withdrawing groove. The variable-diameter cylindrical positioning rod fixing mold is used for fixing, supporting and positioning the variable-diameter cylindrical positioning rod; the variable-diameter cylindrical positioning rod has the functions of positioning, blank inner supporting and filler guide mold; the circular ring inner concave petal die consists of two petal dies and is positioned through a variable-diameter cylindrical positioning rod and a cylindrical outer die; the circular ring gasket die is positioned by a variable-diameter cylindrical positioning rod and a cylindrical outer die; the ceramic blank is filled between the circular ring inner concave petal die and the circular ring gasket die; the annular column ejector rod is positioned through the variable-diameter cylindrical positioning rod and the cylindrical outer mold; and demolding through the demolding groove. The forming die disclosed by the utility model can realize dry-pressing forming and convenient demolding of special-shaped ceramic green bodies, is simple and convenient to operate, and the obtained green bodies are high in strength and small in firing shrinkage.

Description

TECHNICAL FIELD

[0001] The utility model relates to powder dry pressing forming technical field more specifically, relate to a kind of green compact dry pressing forming mould of alumina ceramic sealing test standard part. BACKGROUND

[0002] Alumina ceramic sealing test standard part is due to its excellent electric insulation performance, chemical performance is stable, high temperature resistance, good acid and alkali corrosion resistance, excellent dielectric performance, high mechanical strength, high thermal conductivity, excellent airtightness, and resource is abundant, manufacturing cost is low, it has wide application in electric vacuum, wireless communication, electronic industry, aerospace and other fields, alumina ceramic sealing test standard part belongs to special-shaped ceramic, the following problems still exist in the preparation process of existing traditional alumina ceramic sealing test standard part: mould structure is complex, opening mould cost is high, green compact demoulding is difficult, mould loss is big, it is difficult to meet the green compact preparation forming of high-precision high-strength alumina ceramic sealing test standard part.

[0003] In view of this, we propose a kind of green compact dry pressing forming mould of alumina ceramic sealing test standard part. UTILITY MODEL CONTENT

[0004] 1. Technical problem to be solved

[0005] The utility model is to provide a kind of green compact dry pressing forming mould of alumina ceramic sealing test standard part, can realize the dry pressing forming of special-shaped ceramic green compact, solve the problems, such as difficult preparation of special-shaped green compact, low strength and difficult demoulding.

[0006] 2. Technical scheme

[0007] A kind of green compact dry pressing forming mould of alumina ceramic sealing test standard part, including variable-diameter cylindrical positioning rod fixed mode, variable-diameter cylindrical positioning rod, circular ring inner concave petal mould, cylindrical outer mould, circular ring gasket mould, circular ring cylinder ejector rod, mould removal groove, it is characterized by that: the variable-diameter cylindrical positioning rod fixed mode central position is provided with through-hole, mainly used to fix support and positioning of variable-diameter cylindrical positioning rod, the variable-diameter cylindrical positioning rod is divided into two parts of thick cylinder and thin cylinder, thick cylinder upper end is hemispherical, the circular ring inner concave petal mould is composed of two pieces of petal mould, is positioned by variable-diameter cylindrical positioning rod and cylindrical outer mould, the circular ring gasket mould is positioned by variable-diameter cylindrical positioning rod and cylindrical outer mould, the ceramic blank is evenly filled between circular ring inner concave petal mould and circular ring gasket mould, is positioned by circular ring cylinder ejector rod and cylindrical outer mould, the ceramic blank is dry-pressed by circular ring cylinder ejector rod, and the mould removal groove and the variable-diameter cylindrical positioning rod thin diameter part are collectively provided with mould removal space for green compact mould removal.

[0008] Preferably, the parallelism tolerance of the end faces of all components of the variable diameter cylindrical positioning rod fixing mold, variable diameter cylindrical positioning rod, inner concave petal mold of the annulus, outer cylindrical mold, annulus gasket mold, annulus column top rod, and demolding groove is 0.01mm, the coaxiality tolerance of all components is 0.01mm, the mutual fitting clearance between all components is 0.02mm, and the surface roughness of all components is less than 0.8μm.

[0009] Preferably, the variable-diameter cylindrical positioning rod consists of two parts: a coarse cylinder and a fine cylinder. The upper end of the coarse cylinder is designed as a hemispherical shape, which serves as positioning, internal support for the blank, and guide for the filling mold. The fine cylinder serves as both positioning and demolding.

[0010] Preferably, the concave annular mold consists of two mold pieces, which cooperate with the variable-diameter cylindrical positioning rod for positioning. During demolding, the demolding groove and the narrow diameter part of the variable-diameter cylindrical positioning rod together provide demolding space for the green blank. After demolding, the two mold pieces can be removed from the left and right sides of the green blank, which can achieve non-destructive demolding of the green blank surface.

[0011] Preferably, the variable diameter cylindrical positioning rod fixing mold, variable diameter cylindrical positioning rod, inner concave petal mold of the annulus, outer cylindrical mold, annulus gasket mold, annulus column top rod, and ejection groove are all made of high-strength mold steel, which can withstand molding pressure of up to 780MPa.

[0012] 3. Beneficial effects

[0013] Compared with the prior art, the advantages of this utility model are as follows: The molding mold disclosed in this utility model can realize dry pressing molding of irregular ceramic green bodies, which is convenient to operate, and the green bodies obtained have high strength and small firing shrinkage; the variable diameter cylindrical rod designed in this mold has the functions of positioning, green body internal support, uniform filling mold guide and demolding; the design of the inner concave petal mold gasket of the circular ring can facilitate the demolding of irregular green bodies. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an assembly diagram of the present invention;

[0016] Figure 2 Explanation of the designation numbers: 1. Variable diameter cylindrical positioning rod fixing mold; 2. Variable diameter cylindrical positioning rod; 3. Inner concave petal mold of circular ring; 4. Outer cylindrical mold; 5. Circular ring gasket mold; 6. Circular ring column top rod; 7. Ceramic blank filling space; 8. Demolding groove. Detailed Implementation

[0017] The following will be combined with the appendix Figures 1-2The present invention will be described in detail with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0018] A dry-pressing mold for alumina ceramic sealing test standard green body includes a variable-diameter cylindrical positioning rod fixing mold 1, a variable-diameter cylindrical positioning rod 2, an inner concave annular mold 3, an outer cylindrical mold 4, an annular gasket mold 5, an annular cylindrical ejector rod 6, and a mold release groove 8. The variable-diameter cylindrical positioning rod fixing mold 1 has a height of 20mm, an outer diameter of 30mm, and a through hole with a diameter of 8mm at its center. The variable-diameter cylindrical positioning rod 2 consists of two parts: a coarse cylinder and a fine cylinder. The upper end of the coarse cylinder is hemispherical. The coarse cylinder has a diameter of 10mm and a height of 40mm, while the thin cylinder has a diameter of 8mm and a height of 20mm. The thin cylinder is positioned by the variable-diameter cylindrical positioning rod 2, which engages with the through hole at the center of the cylindrical positioning rod fixing mold 1. The annular concave petal mold 3 consists of two petal molds, positioned by the variable-diameter cylindrical positioning rod 2 and the cylindrical outer mold 4. The total height of the annular concave petal mold 3 is 14mm, with the lower half being an annulus with a height of 6mm. The outer diameter of the annulus is 28mm, and the inner diameter is 10mm. The upper part is a die with a height of 8mm, an outer diameter of 28mm, and an inner diameter of 16mm. The chamfer radius of the ring and die part is 6mm. The cylindrical outer die 4 has an outer diameter of 110mm, an inner diameter of 28mm, and a height of 50mm. The cylindrical outer die 4 cooperates with the inner concave die 3 of the ring and forms an external constraint on the inner concave die 3 of the ring. The ring gasket die 5 has an outer diameter of 28mm, an inner diameter of 16mm, and a height of 6mm. The ring gasket die is made of a variable diameter ring. The cylindrical positioning rod and the cylindrical outer mold are used for positioning. The outer diameter of the annular column top rod 6 is 28mm, the inner diameter is 16mm, and the height is 60mm. The annular column top rod 6 is positioned by cooperating with the upper cylinder of the variable diameter cylindrical positioning rod 2. The forming pressure is transmitted through the annular column top rod to realize the dry pressing forming of the green body. The ceramic blank 7 is evenly filled between the inner concave petal mold 3 and the annular gasket mold 5. The ejection groove 8 and the thinner diameter part of the variable diameter cylindrical positioning rod provide ejection space for the green body.

[0019] The variable diameter cylindrical positioning rod fixing mold 1, variable diameter cylindrical positioning rod 2, inner concave petal mold 3, outer cylindrical mold 4, circular ring gasket mold 5, cylindrical top rod 6, and demolding groove 8 all have a parallelism tolerance of 0.01mm on the end face, a coaxiality tolerance of 0.01mm, a clearance of 0.02mm between all components, and a surface roughness of less than 0.8μm.

[0020] The variable diameter cylindrical positioning rod 2 is divided into two parts: a coarse cylinder and a fine cylinder. The upper end of the coarse cylinder is designed as a hemispherical shape, which serves as positioning, internal support of the blank, and filling guide. The fine cylinder serves as both positioning and demolding.

[0021] The inner concave mold 3 of the ring consists of two mold pieces, which cooperate with the variable diameter cylindrical positioning rod 2 for positioning. When the mold is removed, the mold removal groove 8 and the narrow diameter part of the variable diameter cylindrical positioning rod 2 together provide a mold removal space for the green blank. After the mold is removed, the two mold pieces can be taken out from the left and right sides of the green blank, which can realize the non-destructive demolding of the green blank surface.

[0022] In some implementation cases: the concave petal mold of the annulus can be replaced with concave molds of different sizes and shapes to solve the problem of preparing irregular green bodies of different sizes and shapes, thereby improving the diversity of its experiments;

[0023] The variable diameter cylindrical positioning rod fixing mold 1, variable diameter cylindrical positioning rod 2, inner concave petal mold 3, outer cylindrical mold 4, circular ring gasket mold 5, cylindrical top rod 6, and ejection groove 8 are all made of high-strength mold steel and can withstand molding pressures below 780MPa.

[0024] In addition, the mold processing and design involved in this utility model can be fully implemented by those skilled in the art, so there is no need to elaborate. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0025] In a specific embodiment: First, the thin cylinder of the variable-diameter cylindrical positioning rod 2 is fitted with the through hole at the center of the variable-diameter cylindrical positioning rod fixing mold 1 to achieve fixed positioning. Then, the two petal molds of the inner concave petal mold 3 are placed on the upper surface of the variable-diameter cylindrical positioning rod fixing mold 1 from the left and right sides and fitted with the thick cylinder of the variable-diameter cylindrical positioning rod 2. Positioned by the thick cylinder of the variable-diameter cylindrical positioning rod 2, the outer cylindrical mold 4 and the inner concave petal mold 3 are assembled and fitted together. The two petal molds of the inner concave petal mold 3 are externally constrained to ensure a tight fit. The ceramic blank is evenly filled between the inner concave petal mold 3 and the annular gasket mold 5. The annular column top rod 6 is then... The ceramic blank is dry-pressed by coarse cylinder in conjunction with the variable diameter cylindrical positioning rod 2 and the ring-shaped positioning rod 6. After applying 120MPa pressure to the upper end of the positioning rod 6 and holding it for 10 minutes, the pressure is released. The assembled mold is then reversed so that the variable diameter cylindrical positioning rod fixing mold 1 faces upward. The variable diameter cylindrical positioning rod fixing mold 1 and the variable diameter cylindrical positioning rod 2 are removed, and the demolding groove 8 is placed in the same position. The ring-shaped positioning rod 6 is subjected to slight pressure to complete the demolding. After demolding, the two petal molds of the inner concave petal mold 3 are opened from the left and right sides to complete the demolding of the alumina ceramic sealing test standard blank, and a ceramic blank with non-destructive demolding is obtained.

[0026] The foregoing description illustrates the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the scope of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dry pressing mold for alumina ceramic sealing test standard green blank, comprising a variable diameter cylindrical positioning rod fixing mold (1), a variable diameter cylindrical positioning rod (2), an inner concave petal mold of a circular ring (3), an outer cylindrical mold (4), a circular ring gasket mold (5), a circular ring column top rod (6), a ceramic blank (7), and a mold release groove (8), characterized in that: The variable-diameter cylindrical positioning rod fixing mold (1) is provided with a through hole at the center position, mainly used for fixing and supporting and positioning the variable-diameter cylindrical positioning rod (2), the variable-diameter cylindrical positioning rod (2) is divided into a thick cylinder and a thin cylinder, the upper end of the thick cylinder is hemispherical, the annular inner concave petal mold (3) is composed of two petal molds, positioned by the variable-diameter cylindrical positioning rod (2) and the cylindrical outer mold (4), the annular gasket mold (5) is positioned by the variable-diameter cylindrical positioning rod (2) and the cylindrical outer mold (4), the ceramic blank (7) is uniformly filled between the annular inner concave petal mold (3) and the annular gasket mold (5), the forming pressure is transmitted through the annular cylinder ejector rod (6), the green body is dry-pressed, the annular cylinder ejector rod (6) is positioned by the variable-diameter cylindrical positioning rod (2) and the cylindrical outer mold (4), and the demolding groove (8) and the thin diameter part of the variable-diameter cylindrical positioning rod (2) together provide a demolding space for the green body demolding.

2. A green-press-molded die for an alumina ceramic sealing test standard part according to claim 1, characterized by: The variable-diameter cylindrical positioning rod fixing mold (1), the variable-diameter cylindrical positioning rod (2), the annular inner concave petal mold (3), the cylindrical outer mold (4), the annular gasket mold (5), the annular cylinder ejector rod (6), and the demolding groove (8) all have a parallelism tolerance of 0.01mm, a coaxiality tolerance of 0.01mm, a gap of 0.02mm, and a surface roughness of less than 0.8μm.

3. A green-press-molded die for an alumina ceramic sealing test standard part according to claim 1, characterized in that: The variable-diameter cylindrical positioning rod (2) is divided into a thick cylinder and a thin cylinder, the upper end of the thick cylinder is designed to be hemispherical, and has the functions of positioning, inner support of the blank, and filler guide mold, and the thin cylinder has the functions of positioning and demolding.

4. A green-press-molded die for an alumina ceramic sealing test standard part according to claim 1, characterized by: The annular inner concave petal mold (3) is composed of two petal molds, positioned by the variable-diameter cylindrical positioning rod (2), the demolding groove (8) and the thin diameter part of the variable-diameter cylindrical positioning rod (2) together provide a demolding space for the green body demolding, and the two petal molds can be taken out from the left and right sides of the green body after demolding, achieving non-damage demolding of the surface of the green body.

5. A green-press-molded die for an alumina ceramic sealing test standard part according to claim 1, characterized by: The variable-diameter cylindrical positioning rod fixing mold (1), the variable-diameter cylindrical positioning rod (2), the annular inner concave petal mold (3), the cylindrical outer mold (4), the annular gasket mold (5), the annular cylinder ejector rod (6), and the demolding groove (8) are all made of high-strength mold steel, and can withstand a forming pressure of 780MPa or less.

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