Warm water isostatic pressing structure of large-thickness ceramic capacitor product

Abstract

The utility model discloses a warm water isostatic pressing structure for a large-thickness ceramic capacitor product, which comprises the ceramic capacitor product, a silica gel mold and a bearing plate, a cavity matched with the ceramic capacitor product is arranged in the silica gel mold, a feed port capable of being opened and closed is arranged at the top of the cavity, and the bearing plate is placed on the bottom surface in the cavity. The ceramic capacitor product is placed on the bearing plate, PET film layers are arranged between the bottom face of the ceramic capacitor product and the top face of the bearing plate and between the top face of the ceramic capacitor product and the top face of the cavity, a plurality of exhaust holes are formed in all the side faces of the silica gel mold, the silica gel mold is subjected to vacuum packaging through a double-layer structure, the inner layer of the double-layer structure is a nylon bag layer, and the outer layer of the double-layer structure is a nylon bag layer. And the outer layer is an aluminum foil bag layer. The ceramic capacitor pressing device can meet the pressing requirements of ceramic capacitor products of different sizes, especially the pressing requirements of large-thickness ceramic capacitor products, is convenient to clean and maintain, reduces the operation difficulty and the production cost, and improves the production efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to ceramic capacitor product press technology field especially relates to a big thickness ceramic capacitor product hot water isostatic pressing press structure. BACKGROUND

[0002] In the making process of ceramic capacitor product, along with the increase of product size requirement and the promotion of product precision, performance expectation, the traditional press process exposes many limitations. For 50mm such thick ceramic capacitor product, the conventional hot press forming and hot water isostatic pressing are difficult to make ceramic material inside uniform and dense, and easy to appear bubble residual, deformation, resulting in internal electrode offset, delamination phenomenon, leading to product cracking, product performance consistency, reliability and other parameters are poor in the subsequent processing, easy to break, leading to product damage. Although hot press forming improves the press of thick product to some extent, for the hot press ceramic capacitor product, when the thickness exceeds 30mm, the press effect will be discounted, the density of ceramic inside is not enough, and the ceramic capacitor product cannot be well formed. The main problem is that the ceramic capacitor product will rub with the hot press cavity during hot pressing, resulting in serious deformation of the product during hot pressing. When the hot press machine heats the ceramic capacitor product, due to the large thickness of the product, the heat can only be conducted from the bottom to the inside of the ceramic capacitor product slowly and unevenly. The ceramic capacitor product near the heating plate is overheated, and the part far from the heating plate is not heated enough, resulting in large differences in hot pressing of the ceramic capacitor product. In addition, the traditional one-way pressing method cannot guarantee that the ceramic capacitor product is uniformly stressed in all directions, further aggravating the above problems, and it is difficult to meet the demand of modern industry for high-quality and high-performance ceramic capacitor products. Although hot water isostatic pressing technology is an effective press method, it also faces challenges when dealing with thick ceramic capacitor products. In a high-pressure environment, the sealed bag of the ceramic capacitor product is easy to break, leading to water intrusion, and then causing the disastrous consequences of product cracking. Even if the ceramic capacitor product is wrapped with silica gel pad and vacuumized to enhance the sealing, there are still many difficulties in actual operation, especially when the ceramic capacitor product layer has not formed good adhesion, the wrapping and fixing operation of the silica gel pad is particularly complex, and it is difficult to ensure the smooth progress of the press process. UTILITARIAN CONTENT

[0003] In view of the problems existing in the prior art, the utility model aims at providing a big thickness ceramic capacitor product hot water isostatic pressing press structure to realize the effective press of big thickness ceramic capacitor product.

[0004] To achieve the above object, the utility model provides a kind of big thickness ceramic capacitor product warm water isostatic pressing structure, including ceramic capacitor product, further including silica gel mould and pressure-bearing plate, the silica gel mould is equipped with cavity matched with ceramic capacitor product, the top of the cavity is equipped with openable feed inlet, the pressure-bearing plate is placed on the bottom surface in cavity, the ceramic capacitor product is placed on pressure-bearing plate, and PET film layer is padded between the bottom surface of ceramic capacitor product and the top surface of pressure-bearing plate, between the top surface of ceramic capacitor product and the top surface of cavity, each side of the silica gel mould is equipped with several exhaust holes, and silica gel mould is packaged by double-layer structure vacuum, the inner layer of double-layer structure is nylon bag layer, and the outer layer is aluminum foil bag layer.

[0005] In the above scheme: the outer surface of the silica gel mould is wrapped with a nylon braided mesh layer, and the nylon braided mesh layer is provided with an opening at a position corresponding to the feed inlet. The nylon braided mesh layer enhances the overall rigidity of the silica gel mould, preventing it from deforming excessively under high pressure.

[0006] In the above scheme: the feed inlet includes a slit provided at the top front end of the silica gel mould and a vertically extending crack located at the middle of the front face of the silica gel mould. The front part of the top plate of the silica gel mould can be lifted upwards to form the slit. The slit facilitates the feeding of materials, and the vertically extending crack serves as an auxiliary feeding channel to enlarge the feed inlet.

[0007] In the above scheme: the PET film layer, the cavity, and the pressure-bearing plate have consistent planar dimensions, ensuring that the ceramic capacitor product receives uniform pressing stress in all directions.

[0008] In the above scheme: the exhaust holes are arranged in a matrix on each side of the silica gel mould, and the diameter of each exhaust hole is 0.5-2 mm. The matrix arrangement of the exhaust holes ensures uniform pressure release on each side of the silica gel mould, avoiding excessive local pressure or gas retention. This facilitates the evacuation of gas from the silica gel mould during the vacuuming process, allowing the silica gel mould and the ceramic capacitor product to be tightly bonded together. This avoids the product from being damaged due to the residual bubbles preventing the product from being pressed well.

[0009] In the above scheme: the pressure-bearing plate is made of stainless steel, and each corner of the pressure-bearing plate is chamfered. Stainless steel has high strength and corrosion resistance. The pressure-bearing plate is polished and chamfered to reduce friction with the silica gel mould, preventing the silica gel mould from being damaged or puncturing the vacuum packaging bag, which affects the pressing of the product and causes damage to the product.

[0010] The utility model has the advantages of:

[0011] 1. The silica gel mold has good flexibility and plasticity, can be designed and made according to the product size, meets the pressing needs of ceramic capacitor products of different sizes, especially the pressing needs of large thickness ceramic capacitor products, and is easy to clean and maintain, thereby reducing the production cost; the design of the mold replaces the operation of wrapping the ceramic capacitor product with the silica gel pad, reduces the operation difficulty, and improves the production efficiency.2. The PET film can effectively avoid the direct contact of the ceramic capacitor product with the pressure plate and the top surface of the cavity during the pressing process, has weak adhesion, and facilitates the demolding of the subsequent ceramic capacitor product.3. The silica gel mold adopts double-layer structure vacuum packaging, the inner nylon bag layer has good strength and toughness, can withstand a certain pressure, and protects the silica gel mold from the influence of the external environment; the outer aluminum foil bag layer has good insulation performance, can effectively prevent air, moisture and the like from entering the mold, maintains the vacuum state in the mold, and ensures the stability and uniformity of the pressure in the pressing process. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structure schematic view of the silica gel mold in the utility model.

[0013] Figure 2 is a structure schematic view of the pressure plate in the utility model. DETAILED DESCRIPTION

[0014] As shown in Figure 1 -2, a large thickness ceramic capacitor product warm water isostatic pressing structure mainly comprises a ceramic capacitor product, a silica gel mold 1 and a pressure plate 2.

[0015] The silica gel mold 1 is provided with a cavity 3 matched with the ceramic capacitor product, the top of the cavity 3 is provided with an openable and closable feeding port 4, the feeding port 4 comprises a crack 41 arranged at the top front end of the silica gel mold 1 and a vertically extending crack 42 located at the middle of the front end face of the silica gel mold 1, and the front part of the top plate of the silica gel mold 1 can be opened upward to form the crack 41. The crack 41 facilitates material feeding, and the vertically extending crack 42 serves as an auxiliary feeding channel for expanding the feeding port 4.

[0016] The pressure plate 2 is placed on the bottom surface in the cavity 3, the ceramic capacitor product is placed on the pressure plate 2, and the bottom surface of the ceramic capacitor product and the top surface of the pressure plate 2 and the top surface of the ceramic capacitor product and the top surface of the cavity 3 are all provided with PET film layers. The planar dimensions of the PET film layer, the cavity 3 and the pressure plate 2 are consistent, so that the ceramic capacitor product can be subjected to uniform pressing stress in all directions.

[0017] Specifically, the pressure plate 2 is made of stainless steel material, and each corner of the pressure plate 2 is provided with a chamfer. The stainless steel material has high strength and corrosion resistance. The pressure plate is polished and chamfered to reduce friction with the silica gel mold 1, avoid damage to the silica gel mold 1 or pierce the vacuum packaging bag, and affect the pressing of the product, so that the product is damaged.

[0018] Each side of the silica gel mold 1 is provided with a plurality of exhaust holes 5, and the exhaust holes 5 are arranged in a matrix on each side of the silica gel mold 1. The diameter of a single exhaust hole 5 is 0.5-2mm. The matrix arrangement of the exhaust holes 5 ensures uniform pressure release on each side of the silica gel mold 1, avoids local overpressure or gas retention, and facilitates the discharge of gas in the silica gel mold 1 during vacuumizing, so that the silica gel mold 1 and the ceramic capacitor product are closely attached together, and the product cannot be well pressed due to the residual bubbles, resulting in product damage.

[0019] The outer surface of the silica gel mold 1 is wrapped with a nylon woven mesh layer, and the nylon woven mesh layer is provided with an opening corresponding to the position of the feeding port 4. The nylon woven mesh layer enhances the overall rigidity of the silica gel mold 1 and prevents it from deforming excessively under high pressure. The silica gel mold 1 is also vacuum packaged by a double-layer structure, and the inner layer of the double-layer structure is a nylon bag layer, and the outer layer is an aluminum foil bag layer.

[0020] Specifically, the size of the ceramic capacitor product is 180*180*50mm, the size of the silica gel mold is 190*190*100mm, the size of the pressure plate is 180*180*30mm, the size of the nylon bag is 400*420*0.32mm, and the size of the aluminum foil bag is 400*450*0.32mm.

[0021] The operation steps of the utility model are as follows:

[0022] 1, the preparation of the product packaging and warm hydrostatic press: turn on the heating function of the warm hydrostatic press, set the heating temperature according to the process requirements, place the pressure plate 2 at the bottom of the silica gel mold 1, place a 180*180 PET film above the pressure plate 2, place the ceramic capacitor product to be hot pressed above the pressure plate 2, and place another PET film above the ceramic capacitor product. Put the silica gel mold 1 into the nylon bag and vacuumize it on the vacuum packaging machine. Check whether there is air bubble in the product after vacuumizing, whether the heat sealing port is heat sealed well, vacuumize the product in the aluminum foil bag, check whether there is air bubble in the product after vacuumizing, whether the heat sealing port is heat sealed well, and place the product in the pressing area after checking that there is no error. Wait for the temperature of the warm hydrostatic press to reach the set value.

[0023] 2、Start pressing: After the temperature of the warm water isothermal press reaches the set value, the cavity of the warm water isothermal press is raised, the product to be pressed is placed in the cavity, the product is placed horizontally in the cavity, the cavity is lowered, the product is placed in the warm water for heating for 15 minutes, and during the 15 minutes, the pressing program of the warm water isothermal press needs to be set according to the requirements on the process file. After the heating time of the product reaches, the equipment is started, and after the program is completed, the cavity of the warm water isothermal press is automatically raised, and after completion, the product is taken out, it is detected whether the outer package has defects and whether the product has deformation, after the detection is correct, the outer package of the product is opened, the pressed ceramic capacitor product is taken out, and the PET film on both ends of the product is removed.

[0024] 3、After the product is completely taken out, the size of the pressed product is measured, the shrinkage ratio of the pressing is calculated, whether the pressing of the product meets the process requirements is detected, and after the product is qualified, the equipment is turned off.

Claims

1. A warm water isostatic pressing structure of a large thickness ceramic capacitor product, comprising a ceramic capacitor product, characterized in that: Also include silica gel mold (1) and pressure plate (2), the silica gel mold (1) is equipped with cavity (3) matched with ceramic capacitor product, the cavity (3) top is equipped with openable feed inlet (4), the pressure plate (2) is placed in the bottom surface of cavity (3), the ceramic capacitor product is placed on the pressure plate (2), and the bottom surface between ceramic capacitor product and the top surface of pressure plate (2), the top surface between ceramic capacitor product and the top surface of cavity (3) is all padded with PET film layer, each side of the silica gel mold (1) is equipped with several exhaust holes (5), and the silica gel mold (1) is packaged by double-layer structure vacuum, the inner layer of double-layer structure is nylon bag layer, and the outer layer is aluminum foil bag layer.

2. The warm water isostatic pressing structure of the large thickness ceramic capacitor product according to claim 1, characterized in that: The outer surface of the silica gel mold (1) is wrapped with a nylon woven mesh layer, and the nylon woven mesh layer is provided with an opening at a position corresponding to the feed inlet (4).

3. The warm water isostatic pressing structure of the large thickness ceramic capacitor product according to claim 1, characterized in that: The feed inlet (4) includes a slit (41) arranged at the top front end of the silica gel mold (1) and a vertically extending crack (42) located at the middle of the front end face of the silica gel mold (1), and the front part of the top plate of the silica gel mold (1) can be opened upward to form the slit (41).

4. The warm water isostatic pressing structure of the large thickness ceramic capacitor product according to claim 1, characterized in that: The planar dimensions of the PET film layer, the cavity (3) and the pressure plate (2) are consistent.

5. The warm water isostatic pressing structure of the large thickness ceramic capacitor product according to claim 1, characterized in that: The exhaust holes (5) are arranged in a matrix on each side of the silica gel mold (1), and the aperture of a single exhaust hole (5) is 0.5-2mm.

6. The warm water isostatic pressing structure of the large thickness ceramic capacitor product according to claim 1, characterized in that: The pressure plate (2) is made of stainless steel material, and each corner of the pressure plate (2) is provided with a chamfer.

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