Cold isostatic pressing die

Abstract

The utility model discloses a cold isostatic pressing die, which belongs to the technical field of dies, and comprises a soft outer die, the soft outer die comprises a soft outer die body, the soft outer die body is provided with a through hole in the vertical direction, the upper end of the soft outer die body is provided with an upper annular bulge, and the lower end of the soft outer die body is provided with a lower annular bulge; the upper rubber plug is matched with the upper end of the through hole; the lower rubber plug is matched with the lower end of the through hole; and the rigid inner mold is arranged in the through hole. According to the embodiment of the invention, the upper annular bulge and the lower annular bulge are arranged, so that the pressed biscuit is prevented from being in a shape with larger diameters at two ends and smaller diameter in the middle, and the material loss in later processing is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a cold isostatic pressing mold. Background Technology

[0002] Cold isostatic pressing (CIP) is a technique that uses rubber or plastic as the mold material and liquid as the pressure medium to form products under uniform ultra-high pressure in a closed high-pressure container at room temperature. It is mainly used in powder metallurgy to form powder bodies for further sintering, forging, or hot isostatic pressing processes. It also has wide applications in oxide ceramic target casting and other fields.

[0003] Due to the powder filling process or gravity, the existing cold isostatic pressing molds cause uneven powder accumulation. In addition, because the material of the rubber stopper is harder than that of the rubber sleeve, the powder shrinkage is inconsistent during the pressing process. This results in a blank with a larger diameter at both ends and a smaller diameter in the middle after molding, which requires extensive reshaping through machining, resulting in significant material loss. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a cold isostatic pressing mold to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A cold isostatic pressing mold, comprising:

[0007] A flexible outer mold, comprising a flexible outer mold body, wherein the flexible outer mold body is provided with a through hole in the vertical direction, the upper end of the flexible outer mold body is provided with an upper annular protrusion, and the lower end of the flexible outer mold body is provided with a lower annular protrusion.

[0008] A rubber plug is installed to fit the upper end of the through hole;

[0009] The lower rubber plug mates with the lower end of the through hole;

[0010] A rigid inner mold is disposed within the through hole.

[0011] According to embodiments of this disclosure, the device further includes an upper clamp for securing the upper rubber plug to the through hole, and a lower clamp for securing the lower rubber plug to the through hole.

[0012] According to an embodiment of this disclosure, an upper transition ring is provided between the bottom side of the upper annular protrusion and the soft outer mold body, and a lower transition ring is provided between the top side of the lower annular protrusion and the soft outer mold body.

[0013] According to embodiments of this disclosure, the rigid inner mold is fixedly connected to the upper or lower rubber plug.

[0014] According to an embodiment of this disclosure, the rigid inner mold is fixedly connected to the upper rubber plug, and the lower rubber plug is provided with a support hole that mates with the rigid inner mold.

[0015] According to an embodiment of this disclosure, the end of the upper rubber plug is detachably provided with a lifting ring.

[0016] The embodiments of this disclosure, by providing upper and lower annular protrusions, avoid the pressed blank from having a shape with larger diameters at both ends and a smaller diameter in the middle, thereby reducing material waste in subsequent processing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a cold isostatic pressing mold according to the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram of a cold isostatic pressing mold according to the present invention. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] Existing cold isostatic pressing molds suffer from uneven powder accumulation during the powder filling process due to powder filling technology or gravity. Additionally, the material of the rubber stopper is harder than that of the rubber sleeve, leading to inconsistent powder shrinkage during pressing. This results in a blank with larger diameters at both ends and a smaller diameter in the middle, requiring significant machining for reshaping and resulting in high material loss. To address these issues, a cold isostatic pressing mold is provided that can be used to press the shaft of a CVD-heater (heater assembly in a chemical vapor deposition equipment).

[0021] refer to Figure 1 , Figure 2 A cold isostatic pressing mold, comprising:

[0022] The flexible outer mold includes a flexible outer mold body 1, which has through holes in the vertical direction. The upper end of the flexible outer mold body 1 has an upper annular protrusion 4, and the lower end of the flexible outer mold body 1 has a lower annular protrusion 5.

[0023] Apply adhesive plug 2 to fit the upper end of the through hole;

[0024] The lower rubber plug 3 mates with the lower end of the through hole;

[0025] A rigid inner mold 9 is set in the through hole.

[0026] Specifically, this cold isostatic pressing mold can be used to press rod-shaped green blanks, using ceramic powder. The flexible outer mold can be cylindrical, and the through hole is also cylindrical. The upper plug 2 and lower plug 3 include at least the portion inserted into the cylindrical vent, and the diameter of this portion is slightly larger than the diameter of the through hole. The specific data is set according to requirements. Maintaining a certain interference fit can make the connection tighter. After the upper plug 2 and lower plug 3 are inserted, they form a sealed cavity with the rigid inner mold 9 and the flexible outer mold. This cavity is used to place the powder for pressing. The thickness between the inner and outer rings of the upper annular protrusion 4 and the lower annular protrusion 5 can be the same as that of the upper plug 2 and lower plug 5. 3. The thickness of the portion inserted into the through hole is equal. The height of the upper annular protrusion 4 and the lower annular protrusion 5 in the vertical direction can be greater than the thickness of the portion of the upper rubber plug 2 and the lower rubber plug 3 inserted into the through hole. The end of the upper rubber plug 2 is larger than the diameter of the through hole, and the end of the lower rubber plug 3 is larger than the diameter of the through hole, which is used to limit the depth of insertion into the through hole. The rigid inner mold 9 can be a circular rod-shaped structure with its axis being the same as the axis of the through hole. After pressing, the rigid inner mold 9 is separated from the blank to form a hole. The material for preparing the soft outer mold can be rubber, and the materials of the upper rubber plug 2 and the lower rubber plug 3 can also be the same as those of the soft outer mold. The rigid inner mold 9 can be made of metal.

[0027] By setting the upper annular protrusion 4 and the lower annular protrusion 5, the hardness of both ends of the soft outer mold body 1 is increased, making it close to the hardness of the upper rubber plug 2 and the lower rubber plug 3, avoiding inconsistent powder shrinkage during the manufacturing process, and making the difference between the diameter of the two ends of the blank after molding smaller than that of the middle.

[0028] In some embodiments, it also includes an upper clamp 10 for clamping the upper rubber plug 2 and the through hole, and a lower clamp 11 for clamping the lower rubber plug 3 and the through hole.

[0029] Specifically, the upper clamp 10 is positioned so that it overlaps with the portion of the upper rubber plug 2 inserted into the through hole, facilitating the clamping of the upper clamp 10 with the upper rubber plug 2 and the flexible outer mold. The lower clamp 11 is positioned so that it overlaps with the portion of the lower rubber plug 3 inserted into the through hole, facilitating the clamping of the lower clamp 11 with the lower rubber plug 3 and the flexible outer mold. After the powder filling is completed in the internal cavity, the clamps are locked in place to ensure the reliability of the connection between the upper rubber plug 2, the lower rubber plug 3 and the flexible outer mold. The upper clamp 10 and the lower clamp 11 can be the same type of clamp, specifically a metal clamp, to ensure strength.

[0030] In some embodiments, an upper transition ring 6 is provided between the bottom side of the upper annular protrusion 4 and the soft outer mold body 1, and a lower transition ring 7 is provided between the top side of the lower annular protrusion 5 and the soft outer mold body 1.

[0031] Specifically, the upper transition ring 6 is used to transition the larger upper annular protrusion 4 to the smaller soft outer mold body 1. Its cross-section can be arc-shaped. The structure of the lower transition ring 7 can be the same as that of the upper transition ring 6. The two can be symmetrical. The upper annular protrusion 4 and the lower annular protrusion 5 can be integrally formed with the soft outer mold body 1 during the manufacturing process. By boldly setting the upper transition ring 6 and the lower transition ring 7, the upper annular protrusion 4 and the lower annular protrusion 5 can be made more robust and durable.

[0032] In some embodiments, the rigid inner mold 9 is fixedly connected to the upper rubber plug 2 or the lower rubber plug 3.

[0033] Specifically, the rigid inner mold 9 is fixedly connected to either the upper rubber plug 2 or the lower rubber plug 3. To separate the rigid inner mold 9 from the ceramic blank, it can be done by separating either the upper rubber plug 2 or the lower rubber plug 3.

[0034] In some embodiments, the rigid inner mold 9 is fixedly connected to the upper rubber plug 2, and the lower rubber plug 3 is provided with a support hole that mates with the rigid inner mold 9.

[0035] Specifically, when it is necessary to separate the rigid inner mold 9 and the pressed ceramic blank, this can be accomplished by separating the upper glue plug 2 and the soft outer mold. The lower glue plug 3 can be provided with a support hole to cooperate with the rigid inner mold 9. It can also be a through hole. The lower glue plug 3 has a certain degree of elasticity. The diameter of the support hole can be slightly smaller than the diameter of the rigid inner mold 9 to ensure a tight fit between the rigid inner mold 9 and the support hole. The support hole can also be a blind hole. In use, first insert the upper glue plug 2 into the upper end of the through hole of the soft outer mold, then flip the soft outer mold and fill the internal cavity with powder. After filling, install the lower glue plug 3 from top to bottom. After pressing, the upper glue plug 2 can be left at the top and then removed.

[0036] In some embodiments, the end of the upper rubber plug 2 is detachably provided with a lifting ring 8.

[0037] Specifically, a lifting ring 8 is provided for connecting to external equipment when separating the upper plug 2 from the flexible outer mold. The lifting ring 8 applies a pulling force to the upper plug 2, thereby separating the upper plug 2 from the through hole of the flexible outer mold. The lifting ring 8 and the upper plug 2 are detachably connected. Specifically, a threaded hole can be provided, which is located at the top of the rigid inner mold 9. Correspondingly, a hole is provided on the upper plug 2 that exposes the threaded hole. The lifting ring 8 includes a lifting ring 8 body and a threaded rod connected to the lifting ring 8 body. The threaded rod can be connected by cooperating with the aforementioned threaded hole. By providing the lifting ring 8, it is convenient to separate the upper plug 2 from the flexible outer mold, that is, to facilitate the separation of the rigid inner mold 9 from the pressed ceramic blank.

[0038] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A cold isostatic pressing mold characterized by comprising: The application relates to a soft outer mold, which comprises a soft outer mold body provided with a through hole in the up-down direction, an upper annular protrusion arranged at the upper end of the soft outer mold body, a lower annular protrusion arranged at the lower end of the soft outer mold body, an upper rubber plug matched with the upper end of the through hole, a lower rubber plug matched with the lower end of the through hole and a rigid inner mold arranged in the through hole. The application further comprises an upper clamping hoop for clamping the upper rubber plug and the through hole and a lower clamping hoop for clamping the lower rubber plug and the through hole. An upper transition ring is arranged between the bottom side of the upper annular protrusion and the soft outer mold body, and a lower transition ring is arranged between the top side of the lower annular protrusion and the soft outer mold body. The rigid inner mold is fixedly connected with the upper rubber plug or the lower rubber plug. The rigid inner mold is fixedly connected with the upper rubber plug, and the lower rubber plug is provided with a supporting hole matched with the rigid inner mold.

2. A cold isostatic pressing die according to claim 1, characterized in that The end of the upper rubber plug is detachably provided with a lifting ring.

3. A cold isostatic pressing die according to claim 1, characterized in that ​ 4. A cold isostatic pressing die according to claim 1, characterized in that ​ 5. A cold isostatic pressing die according to claim 4, wherein ​ 6. A cold isostatic pressing die according to claim 5, wherein ​

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