Cold isostatic pressing forming process for ceramic part

Abstract

The invention relates to a cold isostatic pressing forming process for a ceramic part. A ceramic raw material is loaded into the rubber sleeve, the upper end of the rubber sleeve is knotted, sealed and placed into the hollow pipe, the two rotating plates at the upper end of the hollow pipe are rotated, the arc-shaped clamping plates on the two rotating plates are closed, the knotted part is clamped and fixed, and finally the whole discharging frame is placed in the center of an inner cavity of the pressure tank and clamped and fixed to the upper end of the pressure tank through the sealing cover. Sealing the pressure tank; after the discharging frame is placed in the inner cavity, when the inner cavity is not filled with the liquid medium, the lifting circular plate is located in the outer cavity and ascends, the liquid medium in the outer cavity ascends together, the liquid medium in the outer cavity enters the inner cavity after the lifting circular plate ascends by a certain height, and then the lifting circular plate resets; starting the pressure pump, injecting pressure into the pressure tank through the injection pressure pipe, maintaining the pressure after the injection pressure requirement is met, starting the reciprocating device, and enabling the liquid medium to flow through the hollow pipe in a reciprocating manner; and releasing the pressure and taking out the formed blank.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic processing, in particular to a cold isostatic pressing process for ceramic parts. Background Art

[0002] Cold isostatic pressing is a commonly used ceramic forming method. The ceramic powder blanks after cold isostatic pressing are sealed uniformly and have high mechanical strength. The basic process is to put the ceramic powder into a rubber sleeve, seal the rubber sleeve, and then put it into a cage made of metal mesh, and then penetrate into the liquid in the pressure vessel. The liquid medium is injected into the pressure vessel through a pressure pump. According to the principles of fluid mechanics, the liquid medium isostatically compresses the powder from all directions to form it. Under the action of pressure, the ceramic powder will shrink and form in the rubber sleeve. The method of forming ceramic powder into a dense blank through the above process is called cold isostatic pressing. The above cold isostatic pressing method has the following problems: first, the cracking rate of the blank after molding is high; second, when it is taken out from the pressure vessel after molding, some liquid medium will be brought out. When the next batch of ceramic powder is cold isostatically pressed, the compression force of the ceramic powder will change, which will ultimately affect the quality deviation of the batch blanks after molding. Summary of the Invention

[0003] The content of this application is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this application is not intended to identify key features or essential features of the technical solution for which protection is sought, nor is it intended to limit the scope of the technical solution for which protection is sought.

[0004] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a cold isostatic pressing process for ceramic parts, comprising the following steps: S1. Loading and fixing: The unloading rack includes a base plate, on the upper end of which a plurality of hollow tubes are fixedly arranged in an equidistant annular distribution. Two symmetrical rotating plates are respectively provided on both sides of the upper end of the hollow tubes for rotation, and arc-shaped splints are fixed on the rotating plates. The ceramic raw material is loaded into the rubber sleeve, the upper end of the rubber sleeve is knotted and sealed, and the rubber sleeve containing the ceramic raw material is placed into the hollow tube. The two rotating plates at the upper end of the hollow tube are rotated, and the two rotating plates rotate close to each other, and the arc-shaped splints on them are closed to clamp and fix the knotted part. The lower end of the rubber sleeve is placed vertically by its own gravity. The above steps are repeated, and the rubber sleeves containing ceramic raw materials are placed in multiple hollow tubes. Finally, the unloading rack as a whole is placed in the center of the inner cavity of the pressure tank, and the pressure tank is sealed by engaging and fixing it with the sealing cover on the upper end of the pressure tank; S2. Liquid medium compensation: The pressure tank also includes an outer chamber, a lifting circular plate, a drive device, and multiple channels. The channels are arranged on the side walls of the pressure tank, with one end located at the upper end of the pressure tank and the other end located at the bottom of the outer chamber. After the unloading rack is placed in the inner chamber, the inner chamber must be filled with liquid medium. If the inner chamber is not full of liquid medium, the drive device drives the lifting circular plate to rise within the outer chamber, causing the liquid medium in the outer chamber to rise with it. After rising to a certain height, the liquid medium in the outer chamber enters the inner chamber. Once the liquid medium in the inner chamber is full, the drive device drives the lifting circular plate to descend, and the liquid medium that escaped from the inner chamber returns to the outer chamber, facilitating the next addition of liquid medium to the inner chamber. S3. Cold Isostatic Pressing: The unloading rack includes a central groove, multiple circular grooves, and multiple connecting holes. A sealing cover is equipped with an injection pipe and a reciprocating mechanism. The injection pipe is connected to a pressure pump. When the pressure pump is activated, pressure is injected into the pressure tank through the injection pipe. Once the required pressure is reached, the pressure is maintained. Simultaneously, the reciprocating mechanism is activated to pump and inject liquid medium into the central groove, with the liquid medium flowing back and forth through the hollow tube. S4. Unloading: Take out the formed blank after pressure relief.

[0005] Specifically, in step S2, the driving device includes multiple second sealing sleeves, multiple second screws, multiple pinion gears, a large gear, a second motor, and a driving gear; the multiple second sealing sleeves are equidistantly distributed in an annular manner and fixedly arranged at the bottom of the pressure tank, one end of the second screw is rotatably arranged on the second sealing sleeve and the other end is rotatably arranged at the upper end of the pressure tank, the pinion gear is fixedly sleeved at the lower end of the second screw, the large gear is rotatably arranged on the outer wall of the pressure tank and is simultaneously meshed with the multiple pinion gears, the second motor is fixed on the outer wall of the pressure tank, the driving gear is fixedly sleeved on the output shaft of the second motor, the driving gear is meshed with the large gear, and the second screw is threadedly connected to the lifting circular plate; the second motor drives the driving gear to rotate, the driving gear drives the large gear to rotate, the large gear drives the multiple pinion gears to rotate, thereby driving the multiple second screws to rotate, and the rotation of the second screw drives the lifting circular plate to move.

[0006] Specifically, in step S3, the reciprocating device includes two guide rods fixedly mounted on the sealing cover, piston rings fixedly mounted at the lower ends of the two guide rods, the piston ring overlaps and is connected to the center groove, a piston plate is slidingly provided in the piston ring, a first sealing sleeve is located above the piston plate and passes through and fixed on the sealing cover, two connecting rods are fixedly provided on the piston plate, the upper ends of the two connecting rods are respectively slidably sleeved on the two guide rods, a driving shaft is rotatably provided on the first sealing sleeve, the lower end of the driving shaft is fixedly connected to the first screw, the first screw is threadedly connected to the piston plate, the upper end of the driving shaft is fixedly connected to the output shaft of the reducer, and the input shaft of the reducer is fixedly connected to the output shaft of the first motor; start the first motor, the first motor drives the reducer, the reducer drives the driving shaft to rotate, the driving shaft drives the first screw to rotate, the first screw drives the piston plate to move, the piston plate rises to draw the liquid medium in the center groove into the piston ring, and the piston plate descends to inject the liquid medium in the piston ring into the center groove.

[0007] Specifically, the unloading rack also includes a support rod and an arc-shaped support plate. The support rod is located in the circular groove, and the lower end is fixed to the bottom of the circular groove. The arc-shaped support plate is fixed to the upper end of the support rod, and the arc-shaped support plate limits the lower end of the rubber sleeve.

[0008] Specifically, a spiral guide groove is provided on the inner wall of the hollow tube, and the spiral angle is 30°.

[0009] Specifically, the reciprocating operation of the piston plate satisfies: a stroke frequency of 5 times / minute, and a single stroke range of 80% of the piston ring length.

[0010] The beneficial effects of the present invention are: Firstly, the cold isostatic pressing setting can greatly reduce the cracking rate of the green body; through the liquid medium compensation setting, the batch pressure consistency is high, the green body molding quality is stable, and the overall compensation is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0012] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the elements and components are not necessarily drawn to scale.

[0013] In the attached figure: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional structural diagram of the present invention, mainly showing a cross-sectional view of the reciprocating device; Figure 3 for Figure 2 A magnified view of point A in the figure; Figure 4 for Figure 2 Enlarged view of point B in FIG. Figure 5 It is a schematic cross-sectional view of the structure of the present invention, mainly showing a cross-sectional view of the driving device. DETAILED DESCRIPTION

[0014] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0015] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0016] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0017] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0018] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0019] Reference Figure 1-Figure 5 As shown, the cold isostatic pressing process for ceramic parts according to the present invention comprises the following steps: S1. Loading and fixing: the discharge rack includes a bottom plate 31, and a plurality of hollow tubes 32 are fixedly provided with an equidistant annular distribution on the upper end of the bottom plate 31. Two symmetrical rotating plates 33 are respectively provided on both sides of the upper end of the hollow tube 32 for rotation, and an arc-shaped clamping plate 34 is fixed on the rotating plate 33; the ceramic raw material is loaded into the rubber sleeve, the upper end of the rubber sleeve is knotted and sealed, and the rubber sleeve filled with the ceramic raw material is placed in the hollow tube 32, and the two rotating plates 33 at the upper end of the hollow tube 32 are rotated. The two rotating plates 33 rotate close to each other and the arc-shaped clamping plates 34 on them are closed to clamp and fix the knotted part, and the lower end of the rubber sleeve is placed vertically by its own gravity. Repeat the above work, and place the rubber sleeve filled with ceramic raw materials in the plurality of hollow tubes 32. Finally, the discharge rack as a whole is placed at the center of the inner cavity 11 of the pressure tank 1, and is fixed to the upper end of the pressure tank 1 by the sealing cover 2. S2. Liquid medium compensation: The pressure tank 1 also includes an outer chamber 12, a lifting circular plate 13, a drive device 14, and multiple channels 15. The channels 15 are arranged on the side wall of the pressure tank 1, with one end located at the upper end of the pressure tank 1 and the other end located at the bottom of the outer chamber 12. After the unloading rack is placed in the inner chamber 11, the inner chamber 11 is required to be filled with liquid medium. When the liquid medium in the inner chamber 11 is not full, the driving device 14 drives the lifting circular plate 13 to rise within the outer chamber 12, causing the liquid medium in the outer chamber 12 to rise together. After rising to a certain height, the liquid medium in the outer chamber 12 enters the inner chamber 11. After the liquid medium in the inner chamber 11 is full, the driving device 14 drives the lifting circular plate 13 to descend, and the liquid medium escaping from the inner chamber 11 returns to the outer chamber 12, facilitating the next addition of liquid medium to the inner chamber 11. S3. Cold Isostatic Pressing: The unloading rack includes a central groove 35, multiple circular grooves 36, and multiple connecting holes 37. The sealing cover 2 is mounted with an injection pipe 21 and a reciprocating mechanism 22. The injection pipe 21 is connected to a pressure pump. When the pressure pump is activated, pressure is injected into the pressure tank 1 through the injection pipe 21. Once the required pressure is reached, the pressure is maintained. Simultaneously, the reciprocating mechanism 22 is activated to pump and inject liquid medium into the central groove 35. The liquid medium flows back and forth through the hollow pipe 32. S4. Unloading: Remove the molded body after pressure relief; The two rotating plates 33 are rotated to make the arc-shaped clamping plates 34 approach the knotted part. Finally, the two arc-shaped clamping plates 34 on the two rotating plates 33 clamp the upper end of the rubber sleeve at the same time, clamping and fixing the upper end of the rubber sleeve filled with powder, which plays a role in fast fixation and facilitates subsequent disassembly. When disassembling, it is only necessary to pull the upper end of the rubber sleeve and pull it upward. The lower end is freely placed vertically, so that the distance between the rubber sleeve and the hollow tube 32 from top to bottom is consistent, so that the compression is uniform during the subsequent green body forming process, thereby improving the quality of the green body after forming; First, a certain amount of liquid medium is injected into the inner cavity 11, and then the discharge rack is placed in the inner cavity 11 as a whole. If there is too much liquid medium, the escaping liquid medium can directly enter the outer cavity 12. If the liquid medium is too little, it is only necessary to use the driving device 14 to raise the lifting circular plate 13 to make the liquid medium in the outer cavity 12 enter the inner cavity 11 to replenish the liquid medium in the inner cavity 11. After the excess liquid medium in the inner cavity 11 is added, the lifting circular plate 13 is driven to reset and return to the outer cavity 12. The operation is convenient and fast. In summary, after the discharge rack is placed in the inner cavity 11, it is only necessary to drive the lifting circular plate 13 to rise and fall to complete the compensation of the liquid medium. This structure does not need to confirm the amount of liquid medium that needs to be compensated, making it more convenient and quick, and the liquid medium compensation will not cause the pressure inside the pressure tank to change. With the above structure, liquid medium compensation can also be performed when the cold isostatic pressing starts working, which is suitable for use in multiple modes. The sealing cover 2 is snapped and fixedly connected to the pressure tank 1, so that the pressure tank 1 forms a sealed chamber, the pressure pump is started, and a certain pressure is injected into the pressure tank 1 through the injection pipe 21. After the pressure value is reached, the pressure is maintained, and the reciprocating device 22 is started at this time. The reciprocating device 22 allows the liquid medium to flow back and forth in the hollow tube 32, that is, the liquid medium compresses the rubber sleeve while flowing, which changes the compression direction of the rubber sleeve and makes the pressure direction of the rubber sleeve more comprehensive, thereby greatly reducing the cracking rate of the blank. The liquid medium does not affect the pressure inside the pressure tank 1 during the flow process.

[0020] Specifically, in step S2, the driving device 14 includes a plurality of second sealing sleeves 141, a plurality of second screws 142, a plurality of pinion gears 143, a large gear 144, a second motor 145, and a driving gear 146; the plurality of second sealing sleeves 141 are equidistantly distributed in an annular manner and fixedly arranged at the bottom of the pressure tank 1, one end of the second screw 142 is rotatably arranged on the second sealing sleeve 141 and the other end is rotatably arranged at the upper end of the pressure tank 1, the pinion gear 143 is fixedly sleeved at the lower end of the second screw 142, the large gear 144 is rotatably arranged on the outer wall of the pressure tank 1 and is simultaneously meshed with the plurality of pinion gears 143, and the second motor 145 is fixed on the outer wall of the pressure tank 1. The driving gear 146 is fixedly sleeved on the output shaft of the second motor 145, the driving gear 146 is meshed with the large gear 144, and the second screw 142 is threadedly connected to the lifting circular plate 13; the second motor 145 drives the driving gear 146 to rotate, the driving gear 146 drives the large gear 144 to rotate, the large gear 144 drives multiple small gears 143 to rotate, thereby driving multiple second screws 142 to rotate, and the rotation of the second screw 142 drives the lifting circular plate 13 to move; through the above arrangement, the lifting circular plate 13 has good straightness during the rising or falling movement, and the second sealing sleeve 141 is arranged to ensure good sealing between the second screw 142 and the pressure tank 1.

[0021] Specifically, in step S3, the reciprocating device 22 includes two guide rods 221 fixedly mounted on the sealing cover 2, piston rings 222 fixedly mounted at the lower ends of the two guide rods 221, the piston rings 222 overlap with and are connected to the center groove 35, a piston plate 223 is slidably arranged in the piston ring 222, a first sealing sleeve 224 is located above the piston plate 223 and passes through and is fixed on the sealing cover 2, two connecting rods 225 are fixed on the piston plate 223, and the upper ends of the two connecting rods 225 are respectively slidably sleeved on the two guide rods 221, and the first sealing sleeve 224 is fixed on the piston plate 223. A driving shaft 226 is rotatably provided on the shaft sleeve 224, and the lower end of the driving shaft 226 is fixedly connected to a first screw 227, and the first screw 227 is threadedly connected to the piston plate 223. The upper end of the driving shaft 226 is fixedly connected to the output shaft of the reducer 228, and the input shaft of the reducer 228 is fixedly connected to the output shaft of the first motor 229; start the first motor 229, the first motor 229 drives the reducer 228, the reducer 228 drives the driving shaft 226 to rotate, the driving shaft 226 drives the first screw 227 to rotate, and the first screw 227 drives the piston The plate 223 moves, the piston plate 223 rises to draw the liquid medium in the central groove 35 into the piston ring 222, and the piston plate 223 descends to inject the liquid medium in the piston ring 222 into the central groove 35. The first motor 229 drives the first screw 227 to rotate back and forth, so that the piston plate 223 is located in the piston ring 222 and moves back and forth. The upper end of the piston ring 222 is directly connected to the inner cavity 11, and the lower end is connected to the central groove 35. The central groove 35 is connected to the hollow tube 32, and the hollow tube 32 is connected to the inner cavity 11, so that the upper and lower ends of the piston ring 222 are connected at the same time. When the piston plate 223 is in communication with the inner cavity 11, the reciprocating movement of the piston plate 223 will not affect the pressure in the pressure tank 1, that is, the above-mentioned driving method will not cause changes in the internal pressure of the pressure tank 1. The reciprocating movement of the piston plate 223 causes the liquid medium to flow back and forth through the inside of the hollow tube 32, thereby uniformly compressing the rubber sleeve in the hollow tube 32. There is an essential difference between the extrusion of the rubber sleeve by the flow of the liquid medium and the extrusion of the rubber sleeve by the cessation of the flow of the liquid medium. The rubber sleeve is squeezed while flowing, which greatly reduces the cracking problem of the blank after forming.

[0022] Specifically, the unloading rack also includes a support rod 38 and an arc-shaped support plate 39. The support rod 38 is located in the circular groove 36, and the lower end is fixed to the bottom of the circular groove 36. The arc-shaped support plate 39 is fixed to the upper end of the support rod 38. The arc-shaped support plate 39 limits the lower end of the rubber sleeve; the lower end of the rubber sleeve is in contact with the arc-shaped support plate 39. The arc-shaped support plate 39 is set to prevent the lower end of the rubber sleeve from swinging and affecting the quality of the blank forming process. The arc-shaped support plate 39 plays a good limiting role.

[0023] Specifically, a spiral guide groove 321 is provided on the inner wall of the hollow tube 32 with a spiral angle of 30°; when the liquid medium passes through the inside of the hollow tube 32, the liquid medium rotates and flows, eliminating internal stress concentration, thereby making the rubber sleeve compression more uniform and comprehensive, and the blank is less likely to crack after forming.

[0024] Specifically, the reciprocating operation of the piston plate 223 satisfies: a stroke frequency of 5 times / minute, and a single stroke range of 80% of the length of the piston ring 222 .

[0025] The above descriptions are merely some preferred embodiments of the present disclosure and illustrate the underlying technical principles. Those skilled in the art should understand that the scope of the invention encompassed by the embodiments of the present disclosure is not limited to technical solutions formed by specific combinations of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the aforementioned inventive concept. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A cold isostatic pressing process for ceramic parts, characterized in that: The following steps are involved: S1. Loading and fixing: The unloading rack includes a base plate, on the upper end of which a plurality of hollow tubes are fixedly arranged in an equidistant annular distribution. Two symmetrical rotating plates are respectively provided on both sides of the upper end of the hollow tubes for rotation, and arc-shaped splints are fixed on the rotating plates. The ceramic raw material is loaded into the rubber sleeve, the upper end of the rubber sleeve is knotted and sealed, and the rubber sleeve containing the ceramic raw material is placed into the hollow tube. The two rotating plates at the upper end of the hollow tube are rotated, and the two rotating plates rotate close to each other, and the arc-shaped splints on them are closed to clamp and fix the knotted part. The lower end of the rubber sleeve is placed vertically by its own gravity. The above steps are repeated, and the rubber sleeves containing ceramic raw materials are placed in multiple hollow tubes. Finally, the unloading rack as a whole is placed in the center of the inner cavity of the pressure tank, and the pressure tank is sealed by engaging and fixing it with the sealing cover on the upper end of the pressure tank; S2. Liquid medium compensation: The pressure tank also includes an outer chamber, a lifting circular plate, a drive device, and multiple channels. The channels are arranged on the side walls of the pressure tank, with one end located at the upper end of the pressure tank and the other end located at the bottom of the outer chamber. After the unloading rack is placed in the inner chamber, the inner chamber must be filled with liquid medium. If the inner chamber is not full of liquid medium, the drive device drives the lifting circular plate to rise within the outer chamber, causing the liquid medium in the outer chamber to rise with it. After rising to a certain height, the liquid medium in the outer chamber enters the inner chamber. Once the liquid medium in the inner chamber is full, the drive device drives the lifting circular plate to descend, and the liquid medium that escaped from the inner chamber returns to the outer chamber, facilitating the next addition of liquid medium to the inner chamber. S3. Cold Isostatic Pressing: The unloading rack includes a central groove, multiple circular grooves, and multiple connecting holes. A sealing cover is equipped with an injection pipe and a reciprocating mechanism. The injection pipe is connected to a pressure pump. When the pressure pump is activated, pressure is injected into the pressure tank through the injection pipe. Once the required pressure is reached, the pressure is maintained. Simultaneously, the reciprocating mechanism is activated to pump and inject liquid medium into the central groove, with the liquid medium flowing back and forth through the hollow tube. S4. Unloading: Take out the formed blank after pressure relief.

2. A cold isostatic pressing process for ceramic parts according to claim 1, characterized in that: In step S2, the driving device includes multiple second sealing sleeves, multiple second screws, multiple pinions, a large gear, a second motor, and a driving gear; the multiple second sealing sleeves are equidistantly distributed in an annular manner and fixedly arranged at the bottom of the pressure tank, one end of the second screw is rotatably arranged on the second sealing sleeve and the other end is rotatably arranged at the upper end of the pressure tank, the pinion is fixedly sleeved at the lower end of the second screw, the large gear is rotatably arranged on the outer wall of the pressure tank and is simultaneously meshed with the multiple pinions, the second motor is fixed on the outer wall of the pressure tank, the driving gear is fixedly sleeved on the output shaft of the second motor, the driving gear is meshed with the large gear, and the second screw is threadedly connected to the lifting circular plate; the second motor drives the driving gear to rotate, the driving gear drives the large gear to rotate, the large gear drives the multiple pinion gears to rotate, thereby driving the multiple second screws to rotate, and the rotation of the second screw drives the lifting circular plate to move.

3. A cold isostatic pressing process for ceramic parts according to claim 1, characterized in that: In step S3, the reciprocating device includes two guide rods fixedly mounted on the sealing cover, piston rings fixedly mounted at the lower ends of the two guide rods, the piston ring overlaps and is connected to the center groove, a piston plate is slidingly provided in the piston ring, a first sealing sleeve is located above the piston plate and passes through and fixed on the sealing cover, two connecting rods are fixedly provided on the piston plate, the upper ends of the two connecting rods are respectively slidably sleeved on the two guide rods, a driving shaft is rotatably provided on the first sealing sleeve, the lower end of the driving shaft is fixedly connected to the first screw, the first screw is threadedly connected to the piston plate, the upper end of the driving shaft is fixedly connected to the output shaft of the reducer, and the input shaft of the reducer is fixedly connected to the output shaft of the first motor; start the first motor, the first motor drives the reducer, the reducer drives the driving shaft to rotate, the driving shaft drives the first screw to rotate, the first screw drives the piston plate to move, the piston plate rises to draw the liquid medium in the center groove into the piston ring, and the piston plate descends to inject the liquid medium in the piston ring into the center groove.

4. A cold isostatic pressing process for ceramic parts according to claim 1, characterized in that: The unloading rack also includes a support rod and an arc-shaped supporting plate. The support rod is located in the circular groove, and the lower end is fixed to the bottom of the circular groove. The arc-shaped supporting plate is fixed to the upper end of the support rod, and the arc-shaped supporting plate limits the lower end of the rubber sleeve.

5. A cold isostatic pressing process for ceramic parts according to claim 1, characterized in that: The inner wall of the hollow tube is provided with a spiral guide groove with a spiral angle of 30°.

6. The cold isostatic pressing process for ceramic parts according to claim 3, characterized in that: The reciprocating operation of the piston plate meets the following requirements: the stroke frequency is 5 times / minute, and the single stroke range is 80% of the piston ring length.

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