Die for cold isostatic pressing seal forming

Abstract

The utility model provides a die for cold isostatic pressing seal forming. The die comprises a rubber sleeve, a rubber plug and a steel die, the rubber sleeve comprises a rubber plug cavity and a product cavity; the rubber plug is arranged in the rubber plug cavity; the steel die comprises a die sleeve, an upper pressing plate, a lower pressing plate, a pressing rod and a screw rod; the upper pressing plate is arranged above the rubber plug; the die sleeve is sleeved on the outer side of the product cavity, and the top of the die sleeve is tightly attached to the bottom surface of the rubber plug cavity and extends outwards to form a lower pressing plate with a circular edge contour; a pressing rod is arranged above the upper pressing plate in the diameter direction. Through holes are formed in the two ends of the pressing rod respectively, and upper-layer positioning holes and lower-layer positioning holes are formed in the positions, corresponding to the through holes, of the upper pressing plate and the lower pressing plate respectively. The screws sequentially penetrate through the through holes, the upper layer positioning holes and the lower layer positioning holes which are correspondingly arranged, and the tops and the bottoms of the screws are fastened through nuts respectively. The die provided by the utility model can avoid liquid leakage caused by shrinkage deformation, and is good in sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy, in particular to a mold for cold isostatic pressing sealing molding. Background Art

[0002] Cold isostatic pressing uses Pascal's principle to place the pressed material sealed in a flexible mold in a high-pressure cylinder filled with fluid pressure medium. High-pressure equipment is used to apply a certain pressure to the pressure medium in the cylinder, and the pressure is evenly transmitted to the surface of the mold through the pressure medium. The mold used undergoes a certain volume deformation under the action of isostatic pressure. When the pressure acts evenly on the mold surface, the powder in the mold is evenly compressed and densified, and its shape is smaller than or similar to the cavity of the flexible mold.

[0003] At present, since the material to be statically pressed needs to have good deformation ability and fixed cavity shape at room temperature, rubber products are usually used as densification molds. Most of the existing molds are cavities with polygonal cross-sections, such as cubic molds. Since the position of the rubber set filled with powder will be deformed by pressure during the static pressing process, under the action of internal pressure, several corners connected by the polygon will be deformed, and the position of the rubber plug will also change. Once the deformation is too large, the position of the rubber plug will move, which will easily cause the pressure medium fluid to flow into the cavity along the deformed position, causing the product to be infiltrated by the fluid.

[0004] In the existing process, the sealing effect is improved by raising the rubber plug or using a steel mold on the outside. However, raising the rubber plug reduces the internal space of the rubber sleeve and makes demoulding more difficult; when a steel mold outer sleeve is used, the rubber plug and the rubber sleeve are interference fit, and the rubber sleeve part where the rubber plug is inserted usually bulges, so the steel mold outer sleeve cannot cover the rubber sleeve part where the rubber plug is inserted, resulting in deformation and failure to completely solve the hidden danger of leakage.

[0005] Therefore, providing a cold isostatic pressing sealing molding mold is a technical problem that needs to be solved urgently in the art. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a cold isostatic pressing sealing molding mold, which can avoid liquid leakage caused by shrinkage deformation and has good sealing performance.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a mold for cold isostatic sealing molding, the mold comprising a rubber sleeve, a rubber plug and a steel mold;

[0009] The rubber sleeve comprises a cylindrical rubber plug cavity and a product cavity which are concentrically connected and arranged in sequence from top to bottom; the rubber plug is arranged in the rubber plug cavity; the inner diameter of the rubber plug cavity is greater than the diameter of the circumscribed circle of the bottom surface of the product cavity;

[0010] The steel mold comprises a mold sleeve, an upper pressing plate, a lower pressing plate, a pressing rod and a screw;

[0011] The upper pressing plate is in the shape of a circular ring;

[0012] The upper pressing plate is arranged above the rubber plug; the mold sleeve is arranged outside the product cavity, and the top of the mold sleeve is closely attached to the bottom surface of the rubber plug cavity and extends outward to form a lower pressing plate with a circular edge contour;

[0013] A pressure rod is arranged above the upper pressure plate along the diameter direction;

[0014] The two ends of the pressure rod are respectively provided with through holes, and the upper and lower pressure plates are respectively provided with upper and lower positioning holes at positions corresponding to the through holes;

[0015] The screw rod passes through the corresponding through holes, the upper positioning holes and the lower positioning holes in sequence, and the top and the bottom of the screw rod are fastened by nuts respectively.

[0016] In the utility model, a cylindrical rubber plug cavity is provided to better cope with deformation, thereby preventing the corner structure contained in the existing rubber sleeve from being deformed and causing leakage. At the same time, the rubber plug can be firmly pressed against the lower pressure plate of the steel mold through the upper pressure plate, the lower pressure plate, the pressure rod and the screw. Even if the side of the rubber plug is deformed, it will not affect the product cavity below, thereby further improving the sealing of the mold.

[0017] In the present invention, the shape of the product cavity is generally prismatic, for example, the shape of the product cavity can be cubic. In the present invention, the lower pressing plate is generally arranged concentrically with the upper pressing plate.

[0018] Preferably, the outer diameter of the upper pressing plate is greater than the outer diameter of the plug cavity.

[0019] Preferably, the outer diameter of the lower pressing plate is greater than the outer diameter of the plug cavity.

[0020] Preferably, the outer diameter of the upper pressing plate is greater than the outer diameter of the lower pressing plate.

[0021] Preferably, the number of the pressure rods is at least 2.

[0022] Preferably, the pressure rod comprises a first pressure rod and a second pressure rod which are perpendicular to each other.

[0023] Preferably, a first through hole and a second through hole are respectively provided at both ends of the first pressure rod;

[0024] The second pressing rod is provided with a third through hole and a fourth through hole at both ends thereof.

[0025] Preferably, the upper pressing plate and the lower pressing plate are respectively provided with a first upper positioning hole and a first lower positioning hole at positions corresponding to the first through holes;

[0026] The upper pressing plate and the lower pressing plate are respectively provided with a second upper layer positioning hole and a second lower layer positioning hole at positions corresponding to the second through holes;

[0027] The upper pressing plate and the lower pressing plate are respectively provided with a third upper layer positioning hole and a third lower layer positioning hole at positions corresponding to the third through holes;

[0028] The upper pressing plate and the lower pressing plate are respectively provided with a fourth upper layer positioning hole and a fourth lower layer positioning hole at positions corresponding to the fourth through hole.

[0029] Preferably, the screw includes a first screw, a second screw, a third screw and a fourth screw.

[0030] Preferably, the first screw rod passes through the first through hole, the first upper positioning hole and the first lower positioning hole in sequence;

[0031] The second screw rod passes through the second through hole, the second upper positioning hole and the second lower positioning hole in sequence;

[0032] The third screw rod passes through the third through hole, the third upper positioning hole and the third lower positioning hole in sequence;

[0033] The fourth screw rod passes through the fourth through hole, the fourth upper positioning hole and the fourth lower positioning hole in sequence;

[0034] The tops and bottoms of the first screw rod, the second screw rod, the third screw rod and the fourth screw rod are fastened by nuts respectively.

[0035] The operation process of the mold provided by the utility model for filling products is as follows:

[0036] Put the product into the product cavity, then put the rubber plug into the plug cavity, tighten the side wall of the plug cavity from top to bottom with rubber band, first stainless steel throat hoop, second stainless steel throat hoop and rubber band in sequence, and then wrap the outside of the plug cavity with at least 5 layers of stretch film to prevent the side wall of the plug cavity from deformation and leakage;

[0037] Then, put the rubber sleeve into the mold sleeve, place the first pressure rod and the second pressure rod vertically above the upper pressure plate, pass the first screw through the first through hole, the first upper positioning hole and the first lower positioning hole in sequence, pass the second screw through the second through hole, the second upper positioning hole and the second lower positioning hole in sequence, pass the third screw through the third through hole, the third upper positioning hole and the third lower positioning hole in sequence, pass the fourth screw through the fourth through hole, the fourth upper positioning hole and the fourth lower positioning hole in sequence, and fasten the top and bottom of the first screw, the second screw, the third screw and the fourth screw with nuts respectively, thereby completing the loading of the product.

[0038] Compared with the prior art, the beneficial effects of the utility model are:

[0039] The mold provided by the utility model can better cope with deformation by setting a cylindrical rubber plug cavity, thereby avoiding the problem of deformation of the corner structure contained in the existing rubber sleeve and causing leakage. At the same time, the rubber plug can be firmly pressed against the lower pressure plate of the steel mold through the upper pressure plate, the lower pressure plate, the pressure rod and the screw. Even if the side of the rubber plug is deformed, it will not affect the product cavity below, thereby further improving the sealing of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a longitudinal cross-sectional view of the mold for cold isostatic sealing molding and the product after packaging as described in Example 1 of the utility model;

[0041] Figure 2 A top view of the mold for cold isostatic sealing molding and the product after packaging as described in Example 1 of the utility model;

[0042] In the figure: 1-rubber plug; 2-plug cavity; 3-product cavity; 4-mold sleeve; 5-lower pressure plate; 6-first pressure rod; 7-second pressure rod; 8-first screw; 9-second screw; 10-third screw; 11-fourth screw; 12-upper pressure plate; 13-nut; 14-product. DETAILED DESCRIPTION

[0043] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0044] The utility model is further described in detail below. However, the following examples are only simple examples of the utility model and do not represent or limit the scope of protection of the utility model. The scope of protection of the utility model shall be subject to the claims.

[0045] It should be understood that, in the description of the present utility model, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0046] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0047] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing a complete process, but the above content does not belong to the main invention point of the present invention. Those skilled in the art can add layouts on their own based on the process flow and equipment structure selection, and the present invention does not make special requirements and specific limitations on this.

[0048] Example 1

[0049] This embodiment provides a mold for cold isostatic pressing and sealing molding, wherein the longitudinal cross-sectional view and the top view of the mold and the product after packaging are respectively as shown in FIG. Figure 1 and Figure 2As shown, the mold includes a rubber sleeve, a rubber plug 1 and a steel mold. The rubber sleeve includes a cylindrical plug cavity 2 and a cubic product cavity 3 which are concentrically connected and arranged in sequence from top to bottom. The rubber plug 1 is arranged in the plug cavity 2. The inner diameter of the plug cavity 2 is greater than the diameter of the circumscribed circle of the bottom surface of the product cavity 3. The steel mold includes a mold sleeve 4, an upper pressing plate 12, a lower pressing plate 5, a pressing rod and a screw. The upper pressing plate 12 is annular and is arranged above the rubber plug 1. The mold sleeve 4 is sleeved on the outside of the product cavity 3, and the top of the mold sleeve 4 is closely attached to the bottom surface of the plug cavity 2 and extends outward to form a lower pressing plate 5 with a circular edge contour.

[0050] The outer diameters of the upper pressing plate 12 and the lower pressing plate 5 are both greater than the outer diameter of the plug cavity 2, the outer diameter of the upper pressing plate 12 is greater than the outer diameter of the lower pressing plate 5, a pressing rod is arranged above the upper pressing plate 12 along the diameter direction, including a first pressing rod 6 and a second pressing rod 7 perpendicular to each other, the two ends of the first pressing rod 6 are respectively provided with a first through hole and a second through hole, the two ends of the second pressing rod 7 are respectively provided with a third through hole and a fourth through hole, the upper pressing plate 12 and the lower pressing plate 5 are respectively provided with a first upper layer positioning hole and a first lower layer positioning hole at the position corresponding to the first through hole, the upper pressing plate 12 and the lower pressing plate 5 are respectively provided with a second upper layer positioning hole and a second lower layer positioning hole at the position corresponding to the second through hole, the upper pressing plate 12 and the lower pressing plate 5 are respectively provided with a third upper layer positioning hole at the position corresponding to the third through hole Positioning hole and the third lower layer positioning hole, the upper pressing plate 12 and the lower pressing plate 5 are respectively provided with a fourth upper layer positioning hole and a fourth lower layer positioning hole at the position corresponding to the fourth through hole, the screw comprises a first screw 8, a second screw 9, a third screw 10 and a fourth screw 11, the first screw 8 passes through the first through hole, the first upper layer positioning hole and the first lower layer positioning hole in sequence, the second screw 9 passes through the second through hole, the second upper layer positioning hole and the second lower layer positioning hole in sequence, the third screw 10 passes through the third through hole, the third upper layer positioning hole and the third lower layer positioning hole in sequence, the fourth screw 11 passes through the fourth through hole, the fourth upper layer positioning hole and the fourth lower layer positioning hole in sequence, the top and bottom of the first screw 8, the second screw 9, the third screw 10 and the fourth screw 11 are respectively fastened by nuts 13.

[0051] The operation process of the mold provided in this embodiment for filling the product 14 is as follows:

[0052] The product 14 is loaded into the product cavity 3, and then the rubber plug 1 is loaded into the plug cavity 2. The side wall of the plug cavity 2 is tightened from top to bottom in sequence by using a rubber band, a first stainless steel throat hoop, a second stainless steel throat hoop and a rubber band, and then the outer side of the plug cavity 2 is wrapped with a stretch film in five layers, which can prevent the side wall of the plug cavity 2 from deforming and preventing leakage;

[0053] Then, put the rubber sleeve into the mold sleeve 4, place the first pressure rod 6 and the second pressure rod 7 vertically above the upper pressure plate 12, pass the first screw rod 8 through the first through hole, the first upper positioning hole and the first lower positioning hole in sequence, pass the second screw rod 9 through the second through hole, the second upper positioning hole and the second lower positioning hole in sequence, pass the third screw rod 10 through the third through hole, the third upper positioning hole and the third lower positioning hole in sequence, pass the fourth screw rod 11 through the fourth through hole, the fourth upper positioning hole and the fourth lower positioning hole in sequence, and the top and bottom of the first screw rod 8, the second screw rod 9, the third screw rod 10 and the fourth screw rod 11 are respectively fastened by nuts 13 to complete the loading of the product 14.

[0054] To sum up, the mold provided by the utility model can better cope with deformation by setting a cylindrical rubber plug cavity, avoiding the problem of deformation of the corner structure contained in the existing rubber sleeve and causing leakage. At the same time, through the upper pressure plate, lower pressure plate, pressure rod and screw, the rubber plug can be firmly pressed on the lower pressure plate of the steel mold. Even if the side of the rubber plug is deformed, it will not affect the product cavity below, thereby further improving the sealing of the mold.

[0055] The applicant declares that the above is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. The technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by the technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. A cold isostatic sealing molding mold, characterized in that: The mold comprises a rubber sleeve, a rubber plug and a steel mold; The rubber sleeve comprises a cylindrical rubber plug cavity and a product cavity which are concentrically connected and arranged in sequence from top to bottom; the rubber plug is arranged in the rubber plug cavity; the inner diameter of the rubber plug cavity is greater than the diameter of the circumscribed circle of the bottom surface of the product cavity; The steel mold comprises a mold sleeve, an upper pressing plate, a lower pressing plate, a pressing rod and a screw; The upper pressing plate is in the shape of a circular ring; The upper pressing plate is arranged above the rubber plug; the mold sleeve is arranged outside the product cavity, and the top of the mold sleeve is closely attached to the bottom surface of the rubber plug cavity and extends outward to form a lower pressing plate with a circular edge contour; A pressure rod is arranged above the upper pressure plate along the diameter direction; The two ends of the pressure rod are respectively provided with through holes, and the upper and lower pressure plates are respectively provided with upper and lower positioning holes at positions corresponding to the through holes; The screw rod passes through the corresponding through holes, the upper positioning holes and the lower positioning holes in sequence, and the top and the bottom of the screw rod are fastened by nuts respectively.

2. The cold isostatic sealing molding mold according to claim 1, characterized in that: The outer diameter of the upper pressing plate is greater than the outer diameter of the plug cavity.

3. The cold isostatic sealing molding mold according to claim 1, characterized in that: The outer diameter of the lower pressing plate is greater than the outer diameter of the plug cavity.

4. The cold isostatic sealing molding mold according to claim 1, characterized in that: The outer diameter of the upper pressing plate is greater than the outer diameter of the lower pressing plate.

5. The cold isostatic sealing molding mold according to claim 1, characterized in that: The number of the pressure rods is at least 2.

6. The cold isostatic sealing molding mold according to claim 5, characterized in that: The pressure rod comprises a first pressure rod and a second pressure rod which are perpendicular to each other.

7. The cold isostatic sealing molding mold according to claim 6, characterized in that: The first compression rod is provided with a first through hole and a second through hole at both ends thereof; The second pressing rod is provided with a third through hole and a fourth through hole at both ends thereof.

8. The cold isostatic sealing mold according to claim 7, characterized in that: The upper pressing plate and the lower pressing plate are respectively provided with a first upper layer positioning hole and a first lower layer positioning hole at positions corresponding to the first through holes; The upper pressing plate and the lower pressing plate are respectively provided with a second upper layer positioning hole and a second lower layer positioning hole at positions corresponding to the second through holes; The upper pressing plate and the lower pressing plate are respectively provided with a third upper layer positioning hole and a third lower layer positioning hole at positions corresponding to the third through holes; The upper pressing plate and the lower pressing plate are respectively provided with a fourth upper layer positioning hole and a fourth lower layer positioning hole at positions corresponding to the fourth through hole.

9. The cold isostatic sealing molding mold according to claim 8, characterized in that: The screws include a first screw, a second screw, a third screw and a fourth screw.

10. The cold isostatic sealing molding mold according to claim 9, characterized in that: The first screw rod passes through the first through hole, the first upper positioning hole and the first lower positioning hole in sequence; The second screw rod passes through the second through hole, the second upper positioning hole and the second lower positioning hole in sequence; The third screw rod passes through the third through hole, the third upper positioning hole and the third lower positioning hole in sequence; The fourth screw rod passes through the fourth through hole, the fourth upper positioning hole and the fourth lower positioning hole in sequence; The tops and bottoms of the first screw rod, the second screw rod, the third screw rod and the fourth screw rod are fastened by nuts respectively.

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