CN110815525B - Drying tool and method for gel injection molding large-size ceramic blank - Google Patents
Drying tool and method for gel injection molding large-size ceramic blank Download PDFInfo
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- CN110815525B CN110815525B CN201911118214.8A CN201911118214A CN110815525B CN 110815525 B CN110815525 B CN 110815525B CN 201911118214 A CN201911118214 A CN 201911118214A CN 110815525 B CN110815525 B CN 110815525B
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Abstract
The invention provides a drying tool for a large-size ceramic blank formed by gel injection molding, which comprises an upper panel, a lower panel and an outer frame, wherein the upper panel, the lower panel and the outer frame can be assembled into a cavity, the ceramic blank is arranged in the cavity, uniform gaps exist among the ceramic blank, the upper panel, the lower panel and the outer frame, a plurality of spring rolling devices are uniformly fixed on the upper panel, the lower panel and the outer frame, and all the spring rolling devices jointly act to apply uniform elastic constraint on the ceramic blank. The invention also provides a drying method for the large-size ceramic blank formed by gel injection molding, which applies uniform elastic restraint to the blank in the drying process, automatically applies certain force to the blank in the opposite direction of the distortion of the blank when the blank is not uniform and the blank structure is asymmetric in the drying and shrinking process, so that the blank is deformed in the opposite direction of the distortion, the uniform shrinkage of the blank is ensured, the distortion is prevented, and the yield of the ceramic blank is increased.
Description
Technical Field
The invention relates to the technical field of ceramic drying, in particular to a drying tool and a drying method for a large-size ceramic blank formed by gel injection molding.
Background
The gel-casting technique is one of the most advanced ceramic forming techniques at present, and is already applied to SiO2、SiC、Si3N4、Al2O3And (5) preparing the ceramic parts by near net size molding. The common gel-casting process is to add monomer, cross-linking agent, ceramic powder and other additives into water to prepare ceramic slurry; then the monomer and the cross-linking agent are chemically reacted under certain conditions to generate a three-dimensional reticular polymer structure to form colloid, and the ceramic powder is wrapped by the colloid, so that the slurry is changed into the colloid from the fluid, and the biscuit with the required shape is obtained. The biscuit contains a certain amount of water, and the biscuit can be dried only by removing the water in the biscuit through a certain drying processThe biscuit of (1).
The drying process is a very critical step in the gel-casting process. The drying process is a process in which the green body gradually loses moisture, and in the process, the polymer in the green body can drive the ceramic particles to shrink together. It is because of shrinkage that, when the shrinkage is not uniform or constrained, the body is highly susceptible to cracking and non-uniform deformation (distortion) during drying. The patent with publication number CN 107932706B discloses a technology for preventing the mirror blank from cracking due to constraint drying, which well solves the problem of mirror blank cracking due to constraint.
In the shrinking process, due to the influence of factors such as uneven drying conditions, support constraint, blank structure and the like, deformation of each part of the blank is inconsistent, namely the blank is deformed such as uneven shrinkage and warping in a certain direction in the drying process. Excessive distortion can cause the size of the dried blank to exceed the required range, and the blank is unqualified and even scrapped. For large-size gel-cast blanks, the distortion is particularly serious, and the blank yield is greatly reduced.
Therefore, how to prevent the gel-casting large-size ceramic body from generating distortion in the drying shrinkage process becomes a significant and valuable research.
Disclosure of Invention
The invention aims to provide a drying tool and a drying method for a large-size ceramic blank formed by gel casting, aiming at the defects in the prior art, and the blank is uniformly shrunk by applying uniform elastic constraint on the blank in the drying process, so that the distortion of the blank is reduced.
The object of the invention can be achieved by the following technical measures:
the invention provides a drying tool for a large-size ceramic blank formed by gel injection molding, which comprises an upper panel, a lower panel and an outer frame, wherein the upper panel, the lower panel and the outer frame can be assembled into a cavity body;
and a plurality of spring rolling devices are uniformly fixed on the upper panel, the lower panel and the outer frame, all the spring rolling devices exert uniform elastic restraint on the ceramic blank under the combined action, and the ceramic blank still bears uniform elastic restraint after the drying is finished.
Furthermore, the spring rolling device comprises a spring and a universal ball, one end of the spring is fixedly connected to the upper and lower panels or the outer frame, the other end of the spring is provided with the universal ball, and the universal ball is in contact with the outer surface of the ceramic body;
the initial compression amount of the springs in the spring rolling devices on all the lower panels is the same, and the springs still have the compression amount after the drying is finished;
the initial compression amount of the springs in the spring rolling devices on the outer frame is the same, and the compression amount still exists after the drying is finished;
the initial compression amount of the springs in the spring rolling devices on all the upper panels is the same, and the compression amount still remains after the drying is finished.
Further, the number of the spring rolling devices, the length of the spring and the stiffness coefficient are designed according to the size, the structure and the strength of the ceramic blank.
Furthermore, at least 1 channel is arranged on the upper panel, the lower panel or the outer frame, and is used for ensuring that the drying liquid flows into and fills the gap position in the cavity through the channel in the liquid drying process;
or the upper panel, the lower panel or the outer frame is at least provided with 1 through hole for exhausting the evaporated gas in the drying process in the constant temperature and humidity environment.
Further, the ceramic body has the following dimensions: phi 2000mm multiplied by 200mm, with a lightweight structure, the linear shrinkage in the whole drying process is 1%;
the upper panel and the lower panel are both aluminum plates, and the size is phi 2300mm multiplied by 50 mm; the outer frame is an aluminum ring with the outer circle phi of 2300mm, the wall thickness of 50mm and the height of 400 mm; the upper panel, the lower panel and the outer frame are assembled into a hollow cylinder;
the number of the spring rolling devices on the upper panel and the lower panel is 50, and the spring rolling devices are uniformly distributed and avoid the lightweight structure of the ceramic blank; the number of the spring rolling devices on the outer frame is 50, the spring rolling devices are divided into an upper row and a lower row which are respectively 25, and the positions of the spring rolling devices are uniformly distributed;
the initial compression amount of the spring in the spring rolling device on the outer frame is not less than 20mm, and the initial compression amount of the spring in the spring rolling device on the upper panel is not less than 12 mm.
The invention also provides a drying method for the large-size ceramic blank formed by gel casting, and the drying tool for the large-size ceramic blank formed by gel casting comprises the following steps:
step 1, designing the sizes and the materials of an upper panel, a lower panel and an outer frame as well as the quantity and the position distribution of spring rolling devices according to the size, the structure and the strength of the ceramic biscuit;
step 2, fixedly mounting a certain number of spring rolling devices with the same parameters on the lower panel, and uniformly distributing the spring rolling devices at the positions to avoid the lightweight structure of the ceramic biscuit;
step 3, placing the ceramic body on the spring rolling device on the lower panel to ensure that the center of the ceramic body is superposed with the center of the lower panel in the overlooking direction;
step 6, fixedly mounting spring rolling devices with the same number and parameters as those of the lower panel on the upper panel, uniformly distributing the spring rolling devices at the positions and avoiding the lightweight structure of the ceramic biscuit, covering the upper panel on the outer frame, fixing and completing assembly, and ensuring that the centers of the upper panel and the lower panel are overlapped in the overlooking direction;
and 7, placing the assembled whole body in a set drying environment to dry the ceramic blank.
Furthermore, the spring rolling device comprises a spring and a universal ball, one end of the spring is fixedly connected to the upper and lower panels or the outer frame, the other end of the spring is provided with the universal ball, and the universal ball is in contact with the outer surface of the ceramic body;
in the step 3, the initial compression amount of the springs in the spring rolling devices on all the lower panels is the same, and the compression amount still exists after the drying is finished;
in the step 5, the initial compression amounts of the springs in the spring rolling devices on the outer frame are the same, and the compression amounts are still remained after the drying is finished;
in the step 6, the initial compression amount of the springs in the spring rolling devices on all the upper panels is the same, and the springs still have the compression amount after the drying is finished.
Further, in the step 7, the force applied by the single spring to the ceramic body through the universal ball in the whole drying process is determined according to the strength of the ceramic body, and is not more than 200N.
Further, before step 7, at least 1 channel is provided on the upper and lower panels or the outer frame, so as to ensure that the drying liquid flows into and fills the gap position in the cavity through the channel in the liquid drying process;
or the upper panel, the lower panel or the outer frame is at least provided with 1 through hole for exhausting the evaporated gas in the drying process in the constant temperature and humidity environment.
Further, the ceramic body has the following dimensions: phi 2000mm multiplied by 200mm, with a lightweight structure, the linear shrinkage in the whole drying process is 1%;
in the step 1, the upper panel and the lower panel are designed to be aluminum plates, and the sizes of the aluminum plates are phi 2300mm multiplied by 50 mm; the outer frame is an aluminum ring with the outer circle phi of 2300mm, the wall thickness of 50mm and the height of 400 mm; the upper panel, the lower panel and the outer frame are assembled into a hollow cylinder; the number of the spring rolling devices on the upper panel and the lower panel is 50, and the spring rolling devices are uniformly distributed and avoid the lightweight structure of the ceramic blank; the number of the spring rolling devices on the outer frame is 50, the spring rolling devices are divided into an upper row and a lower row which are respectively 25, and the positions of the spring rolling devices are uniformly distributed;
in the step 3, after the ceramic blank is placed on the spring rolling device on the lower panel, the height of the spring and the universal ball is 100 mm;
in the step 5, the initial compression amount of the spring in the spring rolling device on the outer frame is not less than 20 mm;
in the step 6, the initial compression amount of the spring in the spring rolling device on the upper panel is not less than 12 mm.
The invention relates to a drying tool and a drying method for a large-size ceramic blank formed by gel casting, wherein spring rolling devices which are uniformly distributed are arranged on the outer surface of the blank, certain forces are respectively applied to the blank which is not dried in the circumferential direction and the vertical direction under the action of the same spring rolling devices, the compression amounts of springs in the spring rolling devices in the same direction are the same, namely the forces applied by the spring rolling devices in the same direction are the same, so that the blank is dried under uniform elastic restraint. In the drying and shrinking process of the blank body, when the blank body is unevenly shrunk and deformed due to other conditions, such as uneven drying, asymmetrical structure of the blank body and the like, the stress state of a spring on a tool is different due to the distortion of the blank body, and the spring automatically applies a certain force to the blank body in the opposite direction of the distortion of the blank body, so that the blank body is deformed in the opposite direction of the distortion, the uniform shrinkage of the blank body is ensured, the distortion is prevented, and the yield of large-size ceramic blank bodies formed by gel injection molding is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a drying tool for gel-casting a large-size ceramic body according to the present invention;
FIG. 2 is a schematic structural diagram of a spring rolling device in the drying tool for gel injection molding of large-size ceramic blanks according to the present invention;
description of reference numerals: 1-ceramic body; 2-a lower panel; 3-upper panel; 4-outer frame; 5-a spring rolling device; 51-a spring; 52-Universal ball.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In order to make the description of the present disclosure more complete and complete, the following description is given for illustrative purposes with respect to the embodiments and examples of the present invention; it is not intended to be the only form in which the embodiments of the invention may be practiced or utilized. The embodiments are intended to cover the features of the various embodiments as well as the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and step sequences.
The invention provides a drying tool for a large-size ceramic blank formed by gel casting, which comprises an upper panel 3, a lower panel 2 and an outer frame, wherein the upper panel 3, the lower panel 2 and the outer frame 4 can be assembled into a cavity, and the ceramic blank 1 is arranged in the cavity and has uniform gaps with the upper panel 3, the lower panel 2 and the outer frame 4;
a plurality of spring rolling devices 5 are uniformly fixed on the upper panel 3, the lower panel 2 and the outer frame 4, all the spring rolling devices 5 exert uniform elastic constraint on the ceramic body 1 under the combined action, and the ceramic body 1 still bears uniform elastic constraint after the drying is finished.
In some embodiments, the spring rolling device 5 includes a spring 51 and a universal ball 52, one end of the spring 51 is fixedly connected to the upper panel 3, the lower panel 2 or the outer frame 4, and the other end is provided with the universal ball 52, and the universal ball 52 is in contact with the outer surface of the ceramic body 1. Moreover, the initial compression amount of the springs 51 in the spring rolling devices 5 on all the lower panels 2 is the same, and the compression amount still remains after the drying is finished; the initial compression amount of the springs 51 in the spring rolling devices 5 of all the outer frames 4 is the same, and the compression amount still exists after the drying is finished; the initial compression amount of the spring 51 in the spring rolling device 5 on all the upper panels 3 is the same, and the compression amount is still remained after the drying is completed.
Wherein, the number of the spring rolling devices 5, the length of the spring 51 and the stiffness coefficient can be designed according to the size, the structure and the strength of the ceramic blank 1.
In some embodiments, when the drying liquid is used for drying, at least 1 channel (not shown) is provided on the upper panel 3, the lower panel 2 or the outer frame 4 for ensuring that the drying liquid flows into and fills the gap position in the hollow cylinder through the channel during the liquid drying process. Or when the drying mode is performed in a constant temperature and humidity environment, at least 1 through hole (not shown in the figure) is formed in the upper panel 3, the lower panel 2 or the outer frame 4, and is used for exhausting the evaporated gas in the drying process in the constant temperature and humidity environment.
Specifically, when the size of the ceramic body 1 is: phi 2000mm is multiplied by 200mm, the drying device is provided with a lightweight structure, and when the linear shrinkage rate is 1% in the whole drying process, the parameters are designed as follows:
the upper panel 3 and the lower panel 2 are both aluminum plates with the size of phi 2300mm multiplied by 50 mm; the outer frame 4 is an aluminum ring with the outer circle phi of 2300mm, the wall thickness of 50mm and the height of 400 mm; the upper panel 3, the lower panel 2 and the outer frame 4 are assembled into a hollow cylinder; the number of the spring rolling devices 5 on the upper panel 3 and the lower panel 2 is 50, and the spring rolling devices are uniformly distributed at positions and avoid the lightweight structure of the ceramic blank 1; the number of the spring rolling devices 5 on the outer frame 4 is 50, the spring rolling devices are divided into an upper row and a lower row which are respectively 25, and the positions of the spring rolling devices are uniformly distributed; the initial compression amount of the spring 51 in the spring rolling device 5 on the outer frame 4 is not less than 20mm, and the initial compression amount of the spring 51 in the spring rolling device 5 on the upper panel 3 is not less than 12 mm.
The invention also provides a drying method for the gel injection molding large-size ceramic body, and the drying tool for the gel injection molding large-size ceramic body comprises the following steps:
step 1, designing the size and the material of an upper panel 3, a lower panel 2 and an outer frame 4 according to the size, the structure and the strength of the ceramic biscuit 1, and the quantity and the position distribution of spring rolling devices 5;
step 2, fixedly mounting a certain number of spring rolling devices 5 with the same parameters on the lower panel 2, and uniformly distributing the spring rolling devices in positions to avoid the lightweight structure of the ceramic biscuit 1;
step 3, placing the ceramic body 1 on the spring rolling device 5 on the lower panel 2, and ensuring that the center of the ceramic body 1 and the center of the lower panel 2 coincide in the overlooking direction;
step 6, fixedly mounting spring rolling devices 5 with the same quantity and parameters as those of the lower panel 2 on the upper panel 3, uniformly distributing the spring rolling devices in positions and avoiding the lightweight structure of the ceramic biscuit 1, covering the upper panel 3 on the outer frame 4, fixing and completing assembly, and ensuring that the centers of the upper panel 3 and the lower panel 2 are overlapped in the overlooking direction;
and 7, placing the assembled whole body in a set drying environment to dry the ceramic body 1.
In some embodiments, the spring rolling device 5 includes a spring 51 and a universal ball 52, one end of the spring 51 is fixedly connected to the upper panel 3, the lower panel 2 or the outer frame 4, and the other end is provided with the universal ball 52, and the universal ball 52 is in contact with the outer surface of the ceramic body 1. In step 3, the initial compression amount of the springs 51 in the spring rolling devices 5 on all the lower panels 2 is the same, and the compression amount still remains after the drying is completed; in the step 5, the initial compression amounts of the springs 51 in the spring rolling devices 5 on the outer frame 4 are the same, and the compression amounts are still remained after the drying is completed; in the step 6, the initial compression amount of the springs 51 in the spring rolling devices 5 on all the upper panels 3 is the same, and the compression amount is still remained after the drying is completed.
In step 8, the force applied by the single spring 51 to the ceramic body 1 through the universal ball 52 in the whole drying process is determined according to the strength of the ceramic body, and is generally not more than 200N. Before step 7, at least 1 channel is arranged on the upper panel 3, the lower panel 2 or the outer frame 4, so as to ensure that the drying liquid flows into and fills the gap position in the cavity through the channel in the liquid drying process; or the drying device also comprises at least 1 through hole arranged on the upper panel 3, the lower panel 2 or the outer frame 4 and used for exhausting the evaporated gas in the drying process in the constant temperature and humidity environment.
Principle of uniform drying shrinkage: drying the gel injection molding blank under the constraint of a certain uniform spring force, when the blank is deformed unevenly in the drying and shrinking process, for example, the shrinkage in one direction in the horizontal direction is smaller than that in other directions, namely the compression amount of the spring in the direction is larger than that in other directions, the force of the spring on the blank is larger than that in other directions, the subsequent shrinkage of the biscuit in the direction is increased until the shrinkage is the same as that in other directions, and the force applied by the spring in each direction on the biscuit is balanced again. When the blank body warps upwards or downwards, the spring applying force to the warping position acts on the blank body and deforms in the opposite direction of the warping until the blank body returns to the original position, and the forces applied to the blank body by the upper spring and the lower spring are balanced again. So as to ensure that the distortion of the blank body is timely corrected back in the whole drying and shrinking process, thereby realizing uniform shrinkage and ensuring the accurate size after shrinkage.
Examples
The drying method of the gel injection molding large-size ceramic body comprises the following steps:
wherein the ceramic body has the following dimensions: phi 2000mm multiplied by 200mm, with a lightweight structure, the linear shrinkage during the whole drying process is 1%.
Step 1, designing the size and the material of an upper panel 3, a lower panel 2 and an outer frame 4 according to the size, the structure and the strength of the ceramic biscuit 1, and the quantity and the position distribution of spring rolling devices 5. Specifically, the upper panel and the lower panel are both designed to be aluminum plates, and the size of the aluminum plates is phi 2300mm multiplied by 50 mm; the outer frame is an aluminum ring with the outer circle phi of 2300mm, the wall thickness of 50mm and the height of 400 mm; the upper panel 3, the lower panel 2 and the outer frame 4 are assembled into a hollow cylinder; the number of the spring rolling devices on the upper panel and the lower panel is 50, and the spring rolling devices are uniformly distributed and avoid the lightweight structure of the ceramic blank; the number of the spring rolling devices on the outer frame is 50, the spring rolling devices are divided into an upper row and a lower row which are respectively 25, and the positions of the spring rolling devices are uniformly distributed.
And 2, fixedly mounting 50 spring rolling devices 5 with the same parameters on the lower panel 2, and uniformly distributing the spring rolling devices in positions to avoid the lightweight structure of the ceramic biscuit 1.
And 3, placing the ceramic body 1 on the spring rolling device 5 on the lower panel 2, and ensuring that the center of the ceramic body 1 and the center of the lower panel 2 are overlapped in the overlooking direction. After the ceramic body 1 is placed on the spring rolling device 5 on the lower panel 2, the height of the spring 51 and the universal ball 52 is about 100 mm.
And 4, fixedly installing the outer frame 4 on the lower panel 2, and ensuring that the central axis of the outer frame 4 passes through the center of the lower panel 2. At this time, a gap of 100mm having the same width is formed between the outer frame 4 and the blank 1.
And 5, fixedly installing 25 spring rolling devices 5 with the same parameters in an upper row and a lower row on the inner side of the outer frame 4, wherein the positions of the spring rolling devices are uniformly distributed. And, the initial compression amount of the spring 51 in the spring rolling means 5 on the outer frame 4 is controlled to be not less than 20 mm.
And 6, fixedly mounting 50 spring rolling devices 5 with the same parameters on the upper panel 3, uniformly distributing the spring rolling devices in the positions and avoiding the lightweight structure of the ceramic biscuit 1, covering the upper panel 3 on the outer frame 4, fixing and completing assembly, and ensuring that the centers of the upper panel 3 and the lower panel 2 are overlapped in the overlooking direction. Wherein the initial compression amount of the spring 51 in the spring rolling device 5 on the upper panel 3 is controlled to be not less than 12 mm.
Step 7, respectively arranging 1 channel on the upper panel 3, the lower panel 2 or the outer frame 4;
and 8, hanging the assembled whole body into drying liquid, and drying the ceramic body 1, wherein the specific drying process refers to a method introduced in the specification of the drying process for forming the large-size complex-shaped silicon carbide ceramic biscuit by gel injection molding with the authorization notice number of CN 102887711B. The force applied by the single spring 51 to the ceramic body 1 through the universal ball 52 in the whole drying process is determined according to the strength of the ceramic body and is not more than 200N.
The invention relates to a drying tool and a drying method for a large-size ceramic blank formed by gel casting, wherein spring rolling devices which are uniformly distributed are arranged on the outer surface of the blank, certain forces are respectively applied to the blank which is not dried in the circumferential direction and the vertical direction under the action of the same spring rolling devices, the compression amounts of springs in the spring rolling devices in the same direction are the same, namely the forces applied by the spring rolling devices in the same direction are the same, so that the blank is dried under uniform elastic restraint. In the drying and shrinking process of the blank body, when the blank body is unevenly shrunk and deformed due to other conditions, such as uneven drying, asymmetrical structure of the blank body and the like, the stress state of a spring on a tool is different due to the distortion of the blank body, and the spring automatically applies a certain force to the blank body in the opposite direction of the distortion of the blank body, so that the blank body is deformed in the opposite direction of the distortion, the uniform shrinkage of the blank body is ensured, the distortion is prevented, and the yield of large-size ceramic blank bodies formed by gel injection molding is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The drying tool for the large-size ceramic blank formed by gel injection molding is characterized by comprising an upper panel, a lower panel and an outer frame, wherein the upper panel, the lower panel and the outer frame can be assembled into a cavity body;
a plurality of spring rolling devices are uniformly fixed on the upper panel, the lower panel and the outer frame, all the spring rolling devices exert uniform elastic restraint on the ceramic blank under the combined action, and the ceramic blank still bears uniform elastic restraint after the drying is finished;
the spring rolling device comprises a spring and a universal ball, one end of the spring is fixedly connected to the upper panel, the lower panel or the outer frame, the other end of the spring is provided with the universal ball, and the universal ball is in contact with the outer surface of the ceramic body;
the initial compression amount of the springs in the spring rolling devices on all the lower panels is the same, and the springs still have the compression amount after the drying is finished;
the initial compression amount of the springs in the spring rolling devices on the outer frame is the same, and the compression amount still exists after the drying is finished;
the initial compression amount of the springs in the spring rolling devices on all the upper panels is the same, and the compression amount still remains after the drying is finished.
2. The tool for drying the large-size ceramic body by gel injection molding according to claim 1, wherein the number of the spring rolling devices, the length of the spring and the stiffness coefficient are designed according to the size, the structure and the strength of the ceramic body.
3. The tool for drying the large-size ceramic body by gel injection molding according to claim 1, further comprising at least 1 channel provided on the upper and lower panels or the outer frame for ensuring that the drying liquid flows into and fills the gap in the cavity through the channel during the liquid drying process;
or the upper panel, the lower panel or the outer frame is at least provided with 1 through hole for exhausting the evaporated gas in the drying process in the constant temperature and humidity environment.
4. The tool for drying the large-size ceramic body formed by gel injection molding according to claim 2, wherein the ceramic body has the following dimensions: phi 2000mm multiplied by 200mm, with a lightweight structure, the linear shrinkage in the whole drying process is 1%;
the upper panel and the lower panel are both aluminum plates, and the size is phi 2300mm multiplied by 50 mm; the outer frame is an aluminum ring with the outer circle phi of 2300mm, the wall thickness of 50mm and the height of 400 mm; the upper panel, the lower panel and the outer frame are assembled into a hollow cylinder;
the number of the spring rolling devices on the upper panel and the lower panel is 50, and the spring rolling devices are uniformly distributed and avoid the lightweight structure of the ceramic blank; the number of the spring rolling devices on the outer frame is 50, the spring rolling devices are divided into an upper row and a lower row which are respectively 25, and the positions of the spring rolling devices are uniformly distributed;
the initial compression amount of the spring in the spring rolling device on the outer frame is not less than 20mm, and the initial compression amount of the spring in the spring rolling device on the upper panel is not less than 12 mm.
5. A drying method for a large-size ceramic blank formed by gel casting, which adopts the drying tool for the large-size ceramic blank formed by gel casting according to claim 1, and is characterized by comprising the following steps:
step 1, designing the sizes and the materials of an upper panel, a lower panel and an outer frame as well as the quantity and the position distribution of spring rolling devices according to the size, the structure and the strength of the ceramic biscuit;
step 2, fixedly mounting a certain number of spring rolling devices with the same parameters on the lower panel, and uniformly distributing the spring rolling devices at the positions to avoid the lightweight structure of the ceramic biscuit;
step 3, placing the ceramic body on the spring rolling device on the lower panel to ensure that the center of the ceramic body is superposed with the center of the lower panel in the overlooking direction;
step 4, fixedly mounting the outer frame on the lower panel, and ensuring that the central axis of the outer frame passes through the center of the lower panel;
step 5, fixedly mounting a certain number of spring rolling devices with the same parameters on the inner side of the outer frame, wherein the positions of the spring rolling devices are uniformly distributed;
step 6, fixedly mounting spring rolling devices with the same number and parameters as those of the lower panel on the upper panel, uniformly distributing the spring rolling devices at the positions and avoiding the lightweight structure of the ceramic biscuit, covering the upper panel on the outer frame, fixing and completing assembly, and ensuring that the centers of the upper panel and the lower panel are overlapped in the overlooking direction;
step 7, placing the assembled whole body in a set drying environment to dry the ceramic blank;
the spring rolling device comprises a spring and a universal ball, one end of the spring is fixedly connected to the upper panel, the lower panel or the outer frame, the other end of the spring is provided with the universal ball, and the universal ball is in contact with the outer surface of the ceramic body;
in the step 3, the initial compression amount of the springs in the spring rolling devices on all the lower panels is the same, and the compression amount still exists after the drying is finished;
in the step 5, the initial compression amounts of the springs in the spring rolling devices on the outer frame are the same, and the compression amounts are still remained after the drying is finished;
in the step 6, the initial compression amount of the springs in the spring rolling devices on all the upper panels is the same, and the springs still have the compression amount after the drying is finished.
6. The method for drying a large-size ceramic body by gel injection molding according to claim 5, wherein in the step 7, the force applied to the ceramic body by the single spring through the ball gimbal during the whole drying process is determined according to the strength of the ceramic body and is not more than 200N.
7. The method for drying a large-sized ceramic body by gel injection molding according to claim 5, further comprising, before the step 7, providing at least 1 channel on the upper and lower panels or the outer frame for ensuring that the drying liquid flows into and fills the gap position in the cavity through the channel during the liquid drying process;
or the upper panel, the lower panel or the outer frame is at least provided with 1 through hole for exhausting the evaporated gas in the drying process in the constant temperature and humidity environment.
8. The method of drying a large-sized ceramic body by gel-casting according to claim 6, wherein the ceramic body has a size of: phi 2000mm multiplied by 200mm, with a lightweight structure, the linear shrinkage in the whole drying process is 1%;
in the step 1, the upper panel and the lower panel are designed to be aluminum plates, and the sizes of the aluminum plates are phi 2300mm multiplied by 50 mm; the outer frame is an aluminum ring with the outer circle phi of 2300mm, the wall thickness of 50mm and the height of 400 mm; the upper panel, the lower panel and the outer frame are assembled into a hollow cylinder; the number of the spring rolling devices on the upper panel and the lower panel is 50, and the spring rolling devices are uniformly distributed and avoid the lightweight structure of the ceramic blank; the number of the spring rolling devices on the outer frame is 50, the spring rolling devices are divided into an upper row and a lower row which are respectively 25, and the positions of the spring rolling devices are uniformly distributed;
in the step 3, after the ceramic blank is placed on the spring rolling device on the lower panel, the height of the spring and the universal ball is 100 mm;
in the step 5, the initial compression amount of the spring in the spring rolling device on the outer frame is not less than 20 mm;
in the step 6, the initial compression amount of the spring in the spring rolling device on the upper panel is not less than 12 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911118214.8A CN110815525B (en) | 2019-11-15 | 2019-11-15 | Drying tool and method for gel injection molding large-size ceramic blank |
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