CN220446731U - Ceramic powder forming device - Google Patents
Ceramic powder forming device Download PDFInfo
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- CN220446731U CN220446731U CN202321989834.0U CN202321989834U CN220446731U CN 220446731 U CN220446731 U CN 220446731U CN 202321989834 U CN202321989834 U CN 202321989834U CN 220446731 U CN220446731 U CN 220446731U
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- die body
- ceramic powder
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- 239000000919 ceramic Substances 0.000 title claims abstract description 58
- 239000000843 powder Substances 0.000 title claims abstract description 58
- 238000003825 pressing Methods 0.000 claims abstract description 108
- 238000000465 moulding Methods 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 17
- 239000002994 raw material Substances 0.000 description 14
- 238000012360 testing method Methods 0.000 description 6
- 238000005245 sintering Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009770 conventional sintering Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model discloses a ceramic powder forming device which comprises a die body, an upper pressing block, a lower pressing block, an auxiliary pressing head and an auxiliary gasket, wherein the die body is provided with a plurality of pressing grooves; the die body is a hollow cylinder, and the inner cavity of the die body is a cylinder or a prism; the ceramic powder forming device is provided with a first working state and a second working state; in a first working state, the ceramic powder forming device comprises a die body, a lower pressing block, an auxiliary pressing head and an auxiliary gasket; the lower pressing block is positioned in the die body; one end of the auxiliary pressure head is positioned in the die body; the auxiliary gasket is sleeved on the auxiliary pressure head and positioned on the upper surface of the die body; in the second operating state: the ceramic powder forming device comprises a die body, a lower pressing block and an upper pressing block; the upper pressing block and the lower pressing block are respectively positioned in the die body. The utility model can effectively improve the uniformity of the molded body, has simple operation, is convenient for operators to accept, and is suitable for production.
Description
Technical Field
The utility model relates to the field of powder forming, in particular to a ceramic powder forming device.
Background
The conventional molding methods of the contour molded body are basically one-step molding, and the uniformity of the molded body with a smaller thickness is relatively well controlled, but the uniformity of the molded body with a thicker thickness is difficult to ensure. According to the conventional powder molding method, the density of the powder molded close to the surface of the die is larger than that of the powder molded at the middle position of the die, the phenomenon of density difference is more obvious when the thickness is thicker, the uniformity of the powder molded body is greatly influenced, and the powder molding method has the common difficulties in the conventional powder molding and is fatal.
At present, the control method for uniform powder molding is seldom regulated by a molding method, and uniformity is improved mainly by methods such as raw material mixing uniformity, control of a subsequent sintering process of a molded blank body and the like, and although the method plays a certain role in improving the uniformity, non-uniformity formed in the molding process is unavoidable. Therefore, a molding method which is easy to operate and suitable for production and can effectively improve the uniformity of a molded body is sought, and the method has great significance for the process improvement of the uniformity of powder molding.
Disclosure of Invention
The utility model aims to provide a ceramic powder forming device, which can effectively improve the uniformity of a formed body, and meanwhile, the final forming effect is an integrated green body with certain strength.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a ceramic powder forming device which characterized in that: the device comprises a die body, an upper pressing block, a lower pressing block, an auxiliary pressing head and an auxiliary gasket; the inner diameter of the die body, the outer diameter of the upper pressing block, the outer diameter of the lower pressing block and the outer diameter of the auxiliary pressing head are all the same; the heights of the upper pressing block and the lower pressing block are the same; the ceramic powder forming device is provided with a first working state and a second working state;
in a first operating state: the ceramic powder forming device comprises a die body, a lower pressing block, an auxiliary pressing head and an auxiliary gasket; the lower pressing block is positioned in the die body; one end of the auxiliary pressure head is positioned in the die body; the auxiliary gasket is sleeved on the auxiliary pressure head and positioned on the upper surface of the die body; the distance between the lower pressing block and the auxiliary pressing head is t;
in the second operating state: the ceramic powder forming device comprises a die body, a lower pressing block and an upper pressing block; the upper pressing block and the lower pressing block are respectively positioned in the die body; the distance between the lower pressing block and the upper pressing block is T;
t=（0.65~0.75）T。
in the utility model, the distance between the lower pressing block and the auxiliary pressing head is t, which means that when the first working state is finished, the distance between the lower pressing block and the auxiliary pressing head is t, namely the thickness of the first layer of molded body is t; the distance between the lower pressing block and the upper pressing block is T, namely the distance between the lower pressing block and the upper pressing block is T when the second working state is finished, namely the thickness of the molded product is T.
Defining the height of a die body as H, the thickness of an upper pressing block as H1, the thickness of a lower pressing block as H2, the height of an auxiliary pressing head as H3, the thickness of an auxiliary gasket as H4, wherein the distance between the lower pressing block and the auxiliary pressing head is T when the first working state is finished, and the distance between the lower pressing block and the upper pressing block is T when the second working state is finished; satisfying t=h-H1-H2; t=h+h4-H2-H3; t= (0.65 to 0.75) T.
Further, the auxiliary gasket is of an annular structure; the inner diameter of the annular structure is 1.5-2 times, preferably 1.5 times, that of the die body; the outer diameter of the annular structure is not greater than the outer diameter of the die body; the annular structure has an annular width not less than half of the annular width of the die body.
Further, the height of the auxiliary gasket is 0.3-0.5 times, preferably 0.4 times, the height of the auxiliary pressing head.
Preferably, the die body is a hollow cylinder, the inner cavity of the die body is a cylinder or a prism, and the edges of the prism are 3-6 or other values required in production.
In the utility model, the shape of the ceramic powder molded body can be a column with any shape, and the shapes of the upper pressing block, the lower pressing block and the auxiliary pressing head are consistent with the shape of the ceramic powder molded body.
Due to the application of the technical scheme, the utility model has the following beneficial effects compared with the prior art:
the utility model adopts the first working state and the second working state to prepare the formed body, the formed body has good uniformity, high strength and good consistency, and the interface between the two forming steps can not be layered and combined with each other in a weak way;
the prepared formed body is sintered by heat treatment, and has good uniformity and mechanical property consistency. The deviation of the surface data measured by a Rockwell hardness tester is less than 4%; and (3) performing bending strength test by using a universal testing machine, and taking four sample test results, wherein the deviation of the strength data is less than 5%. And the heat-treated sample was cut from the middle part, and the hardness of the middle part of the sample was measured to be equivalent to the surface hardness data.
Drawings
FIG. 1 is a schematic view of a ceramic powder molding apparatus (for example, triangular prism);
FIG. 2 is a schematic view of a ceramic powder molding apparatus (for example, a hexagonal prism);
FIG. 3 is a schematic view of a mold body structure according to the first embodiment;
FIG. 4 is a schematic cross-sectional view of a first working state of the first embodiment;
FIG. 5 is a schematic cross-sectional view of the first embodiment in a second operational state;
wherein: the die body 1, the upper pressing block 2, the lower pressing block 3, the auxiliary pressing head 4, the auxiliary gasket 5, the first cavity 6 and the molded product 7.
Detailed Description
The conventional molding methods of the contour-shaped bodies are basically one-step molding, and the uniformity of the molded bodies with smaller thickness is relatively better controlled, but the uniformity of the molded bodies with larger thickness (more than 8 mm) is difficult to ensure. The utility model will be further described with reference to the drawings and examples, wherein the specific components are prior art, and the connection and use methods between the specific components are conventional.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model, e.g., the orientations or positions indicated by the terms "thickness," "height," "upper," "lower," etc. are based on the orientation or position shown in the accompanying drawings, which are for convenience of description only and are not to be construed as limiting the present disclosure.
The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.
The die body is a hollow cylinder, the inner cavity of the die body is a cylinder or a prism, and the edges of the prism are 3-6 or other numerical values required in production. A triangular prism is shown in fig. 1, and a hexagonal prism is shown in fig. 2.
Example 1
As shown in fig. 3 to 5:
the utility model provides a ceramic powder forming die which characterized in that: the device comprises a die body 1, an upper pressing block 2, a lower pressing block 3, an auxiliary pressing head 4 and an auxiliary gasket 5; the inner diameter of the die body, the outer diameter of the upper pressing block, the outer diameter of the lower pressing block and the outer diameter of the auxiliary pressing head are the same; the thickness of the upper pressing block is the same as that of the lower pressing block; the ceramic powder forming device is provided with a first working state and a second working state;
in a first operating state: the ceramic powder forming device comprises a die body, a lower pressing block, an auxiliary pressing head and an auxiliary gasket; the lower pressing block is positioned in the die body; one end of the auxiliary pressure head is positioned in the die body; the auxiliary gasket is sleeved on the auxiliary pressure head and positioned on the upper surface of the die body; a first cavity 6 is formed among the die body, the lower pressing block and the auxiliary pressing head, and ceramic powder raw materials are placed to form a first layer of molded body;
in the second operating state: the ceramic powder forming device comprises a die body, a lower pressing block and an upper pressing block; the upper pressing block and the lower pressing block are respectively positioned in the die body; a second cavity is formed among the die body, the upper pressing block and the first layer of the molded body, and ceramic powder raw materials are placed to form a molded body product 7.
In this embodiment, the mold material involved is mold steel, and the components are in clearance fit with each other except for the auxiliary gasket. The molded body was prepared in the shape of a cylinder having a diameter of 20mm and a thickness of 10mm.
The height of the die body is 54mm, the height of the upper pressing block is 22mm, the height of the lower pressing block is 22mm, the height of the auxiliary pressing head is 40mm, and the height of the auxiliary gasket is 15mm.
The shape of the die body is a hollow cylinder, the outer diameter of the die body is 80mm, and the inner diameter of the die body, the outer diameter of the auxiliary pressure head and the outer diameter of the molded body are identical and are 20mm; the sub-gasket has an outer diameter of 78mm and an inner diameter of 30mm.
Application example one
With the ceramic powder molding apparatus of example one, 7.2g of the conventional ceramic powder raw material was taken, put in two equal weights, respectively press-molded, with the thickness of the first layer molded body being 7mm and the thickness of the molded body product being 10mm.
During actual production, firstly putting a lower pressing block into a die body, adding 3.6g of ceramic powder raw material, ensuring flatness and uniformity of the ceramic powder raw material in the die body by means of external force, putting an auxiliary pressing head into the die body to press the ceramic powder raw material, sleeving an auxiliary pressing head on the surface of the die body by an auxiliary gasket, performing first pressing (the prior art), obtaining a first layer of molded body, and manually taking out the auxiliary gasket and the auxiliary pressing head; and continuously adding the rest 3.6g of ceramic powder raw materials on the surface of the first layer of molded body, ensuring the raw materials to be flat and uniform by external force in the mold body, putting the upper pressing block into the mold body, and performing secondary pressing (the prior art) to obtain a molded body product, taking out the upper pressing block and the molded body by a mold stripping tool, and thus finishing the molding of the ceramic powder.
The molded body prepared by the device has good uniformity and high strength, and the two times of molding interfaces cannot be layered and combined in a weak manner. And the ceramic sample obtained by conventional sintering has good uniformity and mechanical property.
Ten different points are taken from the surface of the ceramic sample, and the surface hardness data is about 90, and the difference between the maximum value and the minimum value is 3.06% measured by using a Rockwell hardness tester; the ceramic sample is cut from the middle part, and the hardness of the middle part of the ceramic sample is equivalent to the surface hardness data, wherein the hardness deviation is not more than 2%.
Comparative example one
The auxiliary ram and auxiliary washer of the first embodiment are omitted, the remainder being the same.
The ceramic powder molding method in application example one was adjusted to one-time direct molding. Firstly, putting the lower pressing block into a die body, adding 7.2g of ceramic powder raw materials into the die body, ensuring flatness and uniformity of the ceramic powder raw materials in the die body by means of external force, putting the upper pressing block into the die body, and pressing (the prior art) to obtain a formed body, taking out the upper pressing block and the formed body by means of a die-stripping tool, thus completing the forming of the ceramic powder.
The molded body obtained by the method has no great difference in appearance and the molded body obtained by the application example I, but after sintering, the molded body product formed at one time is cut off from the middle part, the hardness of the middle part is measured to be larger than the surface hardness data deviation by more than 10%, the performance consistency of the ceramic molded body is greatly reduced, and the subsequent application performance of the ceramic molded body is correspondingly greatly influenced.
Comparative example two
The thickness of the first layer molded body in application example one was adjusted to 5mm, and the thickness of the molded body product was still 10mm; referring to the first example, 7.2g of the conventional ceramic powder raw material was taken, put in two equal weights, and press-molded separately. The molded body is subjected to conventional sintering to obtain a ceramic sample, and the deviation of the surface hardness data of the molded body product is larger and the maximum value and the minimum value are 11.31% different by using a Rockwell hardness tester.
Example two
The shape of the molded body in example 1 was changed to a rectangular parallelepiped with a length of 25mm, a width of 20mm and a thickness of 10mm, and the shape and dimensions of the mold body, the auxiliary ram, the upper and lower press blocks, the auxiliary washer, and the like were adjusted correspondingly; referring to the first example, 7.2g of the conventional ceramic powder raw material was taken, put in two equal weights, and press-molded separately. The maximum and minimum values of the surface hardness of the molded articles prepared therefrom differ by 4.01%; the ceramic sample was cut from the middle part, and the hardness of the middle part of the ceramic sample was measured to be equivalent to the surface hardness data.
The same ceramic powder raw materials are molded by the process, cuboid with the national standard requirement is manufactured, cuboid (4, the conventional change of dies) with the specification of 10mm x 60mm is manufactured in the embodiment, samples obtained by sintering are subjected to bending strength test by using a universal testing machine, four sample test results are respectively taken, and the strength data deviation is within 5%.
While the utility model has been described with respect to the preferred embodiments, it should be noted that variations and modifications can be made by those skilled in the art without departing from the principles of the utility model, which are also considered to be within the scope of the utility model.
Claims (10)
1. The utility model provides a ceramic powder forming device which characterized in that: the device comprises a die body, an upper pressing block, a lower pressing block, an auxiliary pressing head and an auxiliary gasket; the inner diameter of the die body, the outer diameter of the upper pressing block, the outer diameter of the lower pressing block and the outer diameter of the auxiliary pressing head are all the same; the heights of the upper pressing block and the lower pressing block are the same; the ceramic powder forming device is provided with a first working state and a second working state;
in a first operating state: the ceramic powder forming device comprises a die body, a lower pressing block, an auxiliary pressing head and an auxiliary gasket; the lower pressing block is positioned in the die body; one end of the auxiliary pressure head is positioned in the die body; the auxiliary gasket is sleeved on the auxiliary pressure head and positioned on the upper surface of the die body; the distance between the lower pressing block and the auxiliary pressing head is t;
in the second operating state: the ceramic powder forming device comprises a die body, a lower pressing block and an upper pressing block; the upper pressing block and the lower pressing block are respectively positioned in the die body; the distance between the lower pressing block and the upper pressing block is T;
t=（0.65~0.75）T。
2. the ceramic powder molding apparatus according to claim 1, wherein: the auxiliary gasket is of an annular structure.
3. The ceramic powder molding apparatus according to claim 2, wherein: the inner diameter of the annular structure is 1.5-2 times of the inner diameter of the die body.
4. The ceramic powder molding apparatus according to claim 2, wherein: the outer diameter of the annular structure is not greater than the outer diameter of the die body.
5. The ceramic powder molding apparatus according to claim 2, wherein: the annular structure has an annular width not less than half of the annular width of the die body.
6. The ceramic powder molding apparatus according to claim 1, wherein: the height of the auxiliary gasket is 0.3-0.5 times of the height of the auxiliary pressure head.
7. The ceramic powder molding apparatus according to claim 1, wherein: the die body is a hollow cylinder.
8. The ceramic powder molding apparatus according to claim 7, wherein: the inner cavity of the die body is a cylinder or a prism.
9. The ceramic powder molding apparatus according to claim 1, wherein: in the first working state, the auxiliary pressing head is positioned above the pressing block.
10. The ceramic powder molding apparatus according to claim 1, wherein: in the second working state, the upper pressing block is positioned above the lower pressing block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321989834.0U CN220446731U (en) | 2023-07-27 | 2023-07-27 | Ceramic powder forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321989834.0U CN220446731U (en) | 2023-07-27 | 2023-07-27 | Ceramic powder forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220446731U true CN220446731U (en) | 2024-02-06 |
Family
ID=89732928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321989834.0U Active CN220446731U (en) | 2023-07-27 | 2023-07-27 | Ceramic powder forming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220446731U (en) |
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2023
- 2023-07-27 CN CN202321989834.0U patent/CN220446731U/en active Active
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