CN111590721B - Pressing ceramic mold and manufacturing method of ceramic blank - Google Patents

Abstract

The invention discloses a pressed ceramic die and a manufacturing method of a ceramic blank, and belongs to the field of ceramic production. The punch is fixed at the bottom of the upper die fixing plate through the upper connecting block, and the appearance of the punching part of the punch is consistent with the structure of an inner cavity for pressing the ceramic piece. The lower die module is fixed above the lower die fixing plate, the upper surface of the lower die module is provided with a pressing groove, and the structure of the pressing groove is consistent with that of the outer surface of the pressed ceramic piece. The guide post structure is used for enabling the punch to only do up-and-down die opening and closing movement along with the upper connecting block, and when the punch is in a die closing state, the structure of a cavity enclosed between the punching part of the punch and the pressing groove of the lower die module is the structure for pressing the ceramic piece. The pressing ceramic die disclosed by the invention can greatly shorten the production period of ceramic products and reduce the occupied space in the production process of ceramics, thereby reducing the production and manufacturing cost of single ceramic.

Description

Pressing ceramic mold and manufacturing method of ceramic blank

Technical Field

The invention relates to the field of ceramic production, in particular to a pressing ceramic mold and a manufacturing method of a ceramic blank.

Background

The ceramic finished product can be made only by carrying out seventy-many processes on ceramic materials in the traditional ceramic production process, the production process and the period are overlong, especially, the ceramic is required to be dried for a long time before being roasted, so that a large number of ceramic semi-finished products are in the drying process, so that the ceramic semi-finished products occupy a large number of places and spaces, the space of a workshop for producing and manufacturing ceramic is consumed, the period of ceramic production is seriously prolonged, the efficiency of ceramic production is greatly reduced, and the production cost of ceramic parts is improved. If a device can be designed, the blank making and blank airing processes of the ceramic can be synchronously and quickly completed, or the blank airing process can be omitted after the blank making process and the blank can be directly roasted, so that the production period of the ceramic product and the space occupied by the production of the ceramic can be greatly shortened, and further, the production and manufacturing cost of the single ceramic can be reduced.

Disclosure of Invention

In order to overcome the defects that in the prior art, when a ceramic product is produced and manufactured, a ceramic semi-finished product needs to be dried for a long time before the next process can be carried out, so that the production and manufacturing period of ceramic is prolonged, and the occupied space is large, so that the production cost of single ceramic is high.

To achieve the object, according to one aspect of the present invention, there is provided a pressed ceramic mold comprising:

an upper die fixing plate;

the punch is fixed at the bottom of the upper die fixing plate through an upper connecting block, and the shape of a punching part of the punch is consistent with the structure of an inner cavity of a pressed ceramic piece;

the lower die fixing plate is arranged at the lower position of the upper die fixing plate;

the lower die module is fixed above the lower die fixing plate through a supporting block and a lower connecting block, a pressing groove is formed in the upper surface of the lower die module, and the structure of the pressing groove is consistent with that of the outer surface of a pressed ceramic piece;

and the guide pillar structure is used for enabling the punch to only perform vertical die opening and closing movement along with the upper die fixing plate, and when the punch is in a die closing state, the structure of a cavity enclosed between the outer surface of the punching part of the punch and the pressing groove of the lower die module is the structure for pressing the ceramic part.

Preferably, still include the pan feeding structure, the pan feeding structure set up in lower connecting block and in the lower mould module, the pan feeding structure includes:

the feeding hole is transversely communicated with the lower connecting block;

the wedge-shaped feeding groove is formed in the surface of the lower die module, the lower end of the wedge-shaped feeding groove is communicated with the feeding hole, and the upper end of the wedge-shaped feeding groove is flush with the upper end of the lower die module;

the feeding structure is used for adding ceramic raw materials required by ceramic piece pressing into the pressing groove of the lower die module.

Preferably, the guide post structure includes:

the two ends of the guide pillar are respectively fixed on the lower die fixing plate and the lower connecting block, and the guide pillar is perpendicular to the lower die fixing plate;

the sleeve plate is arranged parallel to the lower die fixing plate, and is provided with a through hole in sliding fit with the guide pillar;

and the upper end and the lower end of the connecting plate are respectively connected with the upper die fixing plate and the sleeve plate.

Preferably, the automatic ejection mechanism comprises an ejection rod, the top of the ejection rod is in sliding fit with a through hole formed in the bottom of a pressing groove in the lower die module, the bottom of the ejection rod is fixed on the guide pillar structure, the ejection rod moves up and down along with the action of opening and closing the die, and the top of the ejection rod is flush with the bottom of the pressing groove in the lower die module during die closing.

Preferably, the ejector rod is provided with a limiting section, the limiting section is arranged below the ejector rod, the diameter of the limiting section is larger than that of the through hole at the bottom of the pressing groove of the lower die module, and when the die is opened, the ejector rod moves upwards until the limiting section contacts with the bottom of the lower die module and limits the die opening action to be further performed.

Preferably, the device also comprises an elastic buffer structure,

the elastic buffer structure is arranged between the upper die fixing plate and the upper connecting block and used for buffering the impact force between the upper connecting block and the lower connecting block during die assembly.

According to another aspect of the invention, a method for manufacturing a ceramic blank is provided, which comprises the following steps:

preparing a ceramic raw material with the water content of 3.5-5.5%;

adding a certain amount of the ceramic raw material with the water content of 3.5-5.5% into a pressing groove of a pressing ceramic die;

pressing the ceramic raw material by a punch to form a ceramic blank;

opening the die after the pressing is finished, and taking out the pressed ceramic blank;

and (3) putting the pressed ceramic blank into a calcining furnace for calcining, and cooling and taking out the ceramic blank after calcining.

The invention has the beneficial effects that:

according to the ceramic pressing die, the punch with the shape of the inner cavity of the ceramic piece and the lower die module with the shape of the outer surface of the ceramic piece pressing groove are adopted and fixed on the upper die fixing plate and the lower die fixing plate respectively, and the movement of the upper die fixing plate and the lower die fixing plate is limited through the guide pillar structure arranged between the upper die fixing plate and the lower die fixing plate, so that the upper die fixing plate can only perform die opening and closing actions. And the punch head is just matched with the pressing groove on the lower die module when the die is closed, and the space gap between the punch head and the pressing groove is the appearance structure of the ceramic product. Thereby add powdered ceramic raw materials through an appropriate amount and compress tightly in pressing the recess via the extrusion of compound die back drift, make ceramic raw materials pressed into the ceramic semi-manufactured goods that has the appearance structure of ceramic product, because the ceramic raw materials that the pressing was used compare in the used ceramic raw materials drier of traditional handicraft system embryo, and receive the extrusion back in the mould at ceramic raw materials, its inside moisture is less, thereby make the ceramic semi-manufactured goods after the mould pressing have sufficient degree of dryness, need not to dry in the air the embryo process, can directly roast. And because the mould pressing is adopted, the manufactured ceramic semi-finished product does not need work such as blank trimming and the like, and has the advantages of good surface roughness and dimensional precision. Therefore, the ceramic die can greatly shorten the production period of ceramic products and reduce the occupied space in the production process of the ceramic, thereby reducing the production cost of single ceramic.

Meanwhile, according to the manufacturing method of the ceramic blank provided by the invention, the water content of the ceramic raw material used when the ceramic blank is pressed by the pressing ceramic mold is controlled to be 3.5-5.5%, so that the conditions of low pressing forming rate or cracking or high porosity after calcination caused by overhigh or overlow water content of the ceramic raw material are avoided, and the quality of the ceramic blank manufactured when the ceramic blank is pressed by the pressing ceramic mold is improved.

Drawings

FIG. 1 is a schematic view of the outline structure of a pressed ceramic mold provided in the present invention;

FIG. 2 is a cross-sectional view taken at B-B of FIG. 1;

FIG. 3 is a cross-sectional view at C-C of FIG. 2;

FIG. 4 is a cross-sectional view taken at D-D of FIG. 1;

fig. 5 is experimental result data obtained after ceramic raw materials with different water contents are used for manufacturing the ceramic blank according to the scheme.

In the figure:

1. an upper die fixing plate; 2. a punch; 3. a lower die fixing plate; 4. a lower die module; 5. a guide post structure; 6. a feeding structure; 7. ejecting the rod; 8. an elastic buffer structure; 9. pressing the ceramic piece; 11. an upper connecting block; 31. a lower connecting block; 32. a support block; 41. pressing a groove; 51. a guide post; 52. sheathing; 53. a connecting plate; 61. a feeding hole; 62. a wedge-shaped feeding groove; 71. a limiting section; 81. a sliding connecting rod; 82. a spring.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Example one

As shown in fig. 1 to 4:

the ceramic pressing mold provided in the embodiment includes: the device comprises an upper die fixing plate 1, a punch 2, a lower die fixing plate 3, a lower die module 4 and a guide pillar structure 5. The upper die fixing plate 1 is located at the top of a ceramic pressing die, the punch 2 is fixed at the bottom of the upper die fixing plate 1 through the upper connecting block 11, the punch 2 is matched in a through hole in the center of the upper connecting block 11, the upper surface of the upper connecting block 11 is connected with the upper die fixing plate 1 through a connecting rod, the upper end of the punch 2 is in sliding fit with a groove in the lower surface of the upper die fixing plate 1, and the appearance of a punching part (which plays a direct extrusion action part on ceramic materials) of the punch 2 is consistent with the inner cavity structure of a pressing ceramic part 9 (an open vessel, such as a teacup and a bowl). The lower die fixing plate 3 is arranged below the upper die fixing plate 1, and the lower die fixing plate 3 is positioned at the bottom of the ceramic pressing die. The surface of the lower die fixing plate 3 is provided with two supporting blocks 32 perpendicular to the lower die fixing plate 3, the two supporting blocks 32 are respectively arranged at two ends of the upper surface of the lower die fixing plate 3, the upper ends of the two supporting blocks 32 support a lower die module 4 and a lower connecting block 31, the lower die module 4 is arranged in a through hole at the center of the lower connecting block 31, the upper surface of the lower die module 4 is provided with a pressing groove 41, the structure of the pressing groove 41 is consistent with the structure of the outer surface of a pressing ceramic piece 9, the shape of the pressing groove 41 determines the appearance structure of the pressing ceramic piece 9 made by a pressing ceramic die, and the structure of the punching part of the punch 2 determines the structure of the shape of the inner cavity of the pressing ceramic piece 9 made by the pressing ceramic die. The guide pillar structure 5 acts between the upper die fixing plate 1 and the lower die fixing plate 3, and is used for enabling the punch 2 and the upper connecting block 11 to only perform vertical die opening and closing movement along with the upper die fixing plate 1, and when the punch is in a die closing state, the structure of a cavity enclosed between the outer surface of the punching part of the punch 2 and the pressing groove 41 of the lower die module 4 is the structure for pressing the ceramic part 9. The guide post structure 5 is used for limiting the movement mode of the upper half part of the ceramic pressing die to only vertically move up and down (namely the die opening and closing action), and helps the punch 2 to be positioned, so that the punch 2 can be accurately matched with the pressing groove 41 in a die closing manner.

In summary, when the pressing operation of the ceramic pressing member 9 is required, a mold opening operation is performed first, a certain amount (specifically determined according to the size of the ceramic pressing member 9) of powdered ceramic raw materials is added into the pressing groove 41, then the hydraulic system is started to close the mold of the ceramic pressing mold, because the guide post structure 5 is provided to limit and position the movement of the upper mold (moving mold), the punch 2 located below the upper mold fixing plate 1 can be accurately in extrusion fit with the pressing groove 41, so that the powdered ceramic raw materials originally located in the pressing groove 41 can be mutually bonded together under the action of strong pressure, and the final shape structure of the powdered ceramic raw materials is the structure of a clearance space between the punch 2 and the pressing groove 41 after the mold closing, so that the structures of the punch 2 and the pressing groove 41 can be changed according to specific production requirements, different pressed ceramic parts 9 are obtained. Because the pressing ceramic die adopts the powdered ceramic raw material that is more dry than the ceramic raw material who uses in traditional system embryo technology, so, it is less to be connected through the inside water content of pressing ceramic member 9 after the compression moulding, need not to carry out the embryo process that dries in the air for a long time, and repair the embryo process to pressing ceramic member 9 finish, and can directly put into the oven and roast, thereby saved the long embryo process that dries in the air consuming time, the phenomenon that occupies a large amount of spaces of mill when avoiding appearing a large amount of ceramic embryo spare and drying, thereby the production cycle of ceramic product has been reduced, the cost of unit price ceramic product has been reduced.

In order to facilitate improving the production efficiency of pressing ceramic member 9, further, still include pan feeding structure 6, pan feeding structure 6 sets up in connecting block 31 and lower mould module 4 down, and pan feeding structure 6 includes: a feeding hole 61 and a wedge-shaped feeding groove 62. In pan feeding hole 61 transversely link up and lower connecting block 31, pan feeding hole 61 is provided with four, is located four sides of square lower connecting block 31 respectively to be provided with the wedge pan feeding groove 62 with pan feeding hole 61 intercommunication on four sides of square lower mould module 4, the upper end of wedge pan feeding groove 62 is close to the upper end of suppression recess 41. Therefore, by arranging the feeding holes 61 and the wedge-shaped feeding grooves 62, four feeding pipes can be adopted to extend above the lower die module 4, and feeding is carried out in the pressing groove 41. And because adopt four evenly distributed's filling tube to add material to suppression recess 41 to make the ceramic raw materials distribution in the suppression recess 41 more even, thereby be convenient for in the follow-up suppression to ceramic raw materials's processing, make the ceramic product texture of making more even. To sum up, through setting up pan feeding structure 6 and can avoid the action that needs the manual action of feeding in raw material before the suppression at every turn, only need through the feeding amount before four filling tubes suppression at every turn, alright with more even carry out reinforced to pressing recess 41 to improve reinforced efficiency, and then improved the production efficiency of suppression ceramic part 9.

Further, the guide post structure 5 includes: guide post 51, strap 52, connecting plate 53. Two ends of the guide post 51 (two or more) are fixed on the lower die fixing plate 3 and the lower connecting block 31, respectively, and the guide post 51 is perpendicular to the lower die fixing plate 3. The sleeve plate 52 is arranged parallel to the lower die fixing plate 3, and the sleeve plate 52 is provided with a through hole which is in sliding fit with the guide post 51. The upper and lower ends of the connecting plate 53 are connected to the upper mold fixing plate 1 and the strap 52, respectively. The guide post 51 limits the sleeve plate 52 to move up and down only in the axial direction of the guide post 51, and then the two ends of the upper die fixing plate 1 are fixedly connected with the sleeve plate 52 through the connecting plate 53, so that the upper die fixing plate 1 can only move up and down (i.e. open and close the die) vertical to the surface of the lower die fixing plate 3. And because the punch 2 is connected with the upper die fixing plate 1, under the action of the guide pillar structure 5 for limiting the motion mode, the punch 2 can be accurately positioned at the same position (namely, the position tightly matched with the pressing groove 41) when the die is repeatedly closed, so that the sizes of the pressed ceramic pieces 9 pressed by the ceramic die are consistent.

In order to facilitate taking out the pressed ceramic part 9 after being pressed from the pressing groove 41, further, the ceramic part pressing device further comprises an automatic ejection structure, the automatic ejection structure comprises an ejector rod 7, the top of the ejector rod 7 is in sliding fit with a through hole arranged at the bottom of the pressing groove 41 in the lower die module 4, the bottom of the ejector rod 7 is fixed on the guide pillar structure 5, the ejector rod 7 moves up and down along with the opening and closing of the die, and when the die is closed (when the punch 2 is tightly matched with the pressing groove 41), the top of the ejector rod 7 is flush with the bottom of the pressing groove 41 in the lower die module 4, so that the top of the ejector rod 7 is prevented from influencing the structure of the pressed ceramic part 9. When the mold is opened, the ejector rod 7 on the upper surface of the sleeve plate 52 moves upwards together with the sleeve plate 52 under the action of the upward movement of the sleeve plate 52, so that the pressed ceramic parts 9 in the pressing grooves 41 can be ejected out under the action of the ejector rod 7, and the purpose of quickly taking out the pressed ceramic parts 9 is achieved. Different ejector rods 7 can be set according to the structures of different pressed ceramic parts 9, the contact area between the top of the ejector rod 7 and the pressed ceramic part 9 needs to be ensured to be large enough, and the pressed ceramic part 9 is prevented from being damaged when the ejector rod 7 ejects the pressed ceramic part 9.

In order to limit the amount of movement of the mold opening action, further, the ejector rod 7 is provided with a limiting section 71, the limiting section 71 is arranged below the ejector rod 7, the diameter of the limiting section 71 is larger than that of a through hole at the bottom of the pressing groove 41 of the lower mold module 4, when the mold is opened, the ejector rod 7 moves upwards until the limiting section 71 contacts with the bottom of the lower mold module 4 and limits the further progress of the mold opening action, so that the amount of movement of the mold opening is the distance between the upper end of the limiting section 71 and the bottom of the lower mold module 4 (the specific length can be set according to the height of the pressed ceramic part 9).

As shown in fig. 4. In order to avoid damage caused by severe collision between the upper connecting block 11 and the lower connecting block 31 in the process of die assembly, the die assembly further comprises an elastic buffer structure 8, wherein the elastic buffer structure 8 is arranged between the upper die fixing plate 1 and the upper connecting block 11 and is used for buffering the impact force between the upper connecting block 11 and the lower connecting block 31 during die assembly. The elastic buffer structure 8 includes a sliding connection rod 81 and a spring 82, wherein the sliding connection rod 81 has two large ends and a small middle part, the middle part of the sliding connection rod 81 is sleeved in the through hole of the upper mold fixing plate 1, and the upper end of the sliding connection rod 81 is larger than the through hole of the upper mold fixing plate 1, so that the sliding connection rod 81 is slidably connected in the through hole of the upper mold fixing plate 1. The lower end of the sliding connecting rod 81 is fixedly connected with the upper connecting block 11, and the sliding connecting rod 81 between the upper connecting block 11 and the upper die fixing plate 1 is sleeved with a spring 82, so that when the die is closed, the upper die fixing plate 1 applies downward pressure on the upper connecting block 11 through the spring 82, and therefore the spring 82 has a buffering effect, and the damage caused by severe collision in the die closing process between the upper connecting block 11 and the lower connecting block 31 is avoided.

Example two

According to another aspect of the invention, the manufacturing method of the ceramic blank comprises the following steps:

s1, preparing a ceramic raw material with the water content of 3.5-5.5%;

s2, adding a certain amount of the ceramic raw material with the water content of 3.5-5.5% into a pressing groove 41 of a pressing ceramic mold;

s3, pressing the ceramic raw material by the punch 2 to form a ceramic blank;

s4, opening the mold after pressing is finished, and taking out the pressed ceramic blank;

and S5, placing the pressed ceramic blank into a calcining furnace for calcining, and cooling and taking out the ceramic blank after calcining is finished.

Wherein the ceramic raw material comprises the following solid components in percentage by weight: 10 to 20 percent of clay, 15 to 23 percent of quartz, 5 to 8 percent of feldspar, 13 to 16 percent of kaolin, 5 to 6 percent of sericite, 6 to 7 percent of talcum, 13 to 15 percent of lime, 1 to 1.5 percent of MgO, 1 to 1.5 percent of ZnO, 1.5 to 1.2 percent of BaO1, 2 to 1.2 percent of Cr2O31, 1 to 1.2 percent of SiC, 40.8 to 1.2 percent of Si3N40, 21.1 to 1.3 percent of ZrO21 and 0.9 to 1.2 percent of beta-BN.

Because the water content in the ceramic blank needs to be strictly controlled before the ceramic blank is calcined, if the water content is too high, in the calcining process, a large amount of water in the ceramic blank evaporates and is emitted from the surface of the ceramic blank, and the ceramic blank cracks or generates pores and other adverse effects, in order to clarify the influence of ceramic raw materials with different water contents on the quality of the finally prepared ceramic blank when a pressed ceramic mold is used for preparing the blank, the following experiment is designed in the embodiment, the ceramic blanks are prepared according to the above method steps, and 100 ceramic blanks are tested according to each water content to obtain the experimental data in fig. 5, wherein the ceramic raw materials with different water contents (the water contents are respectively 1.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6% and 8%, and the other component contents are the same). As can be seen from the figure, when the water content of the ceramic material is too low (for example, 1.5%), the viscosity between the ceramic materials is insufficient, and the molding rate after pressing by the pressing ceramic mold is only 70%, but when the water content of the material is small, the ceramic green body is not fired and cracked and the pore defects are zero, so that the ceramic material having too low water content is not suitable as a material for pressing the ceramic mold. The water content of the ceramic raw material is further increased to 4%, the press forming rate is increased to 97%, and ceramic blanks prepared from the ceramic raw material with the water content are not cracked or have poor air holes after being calcined. On the contrary, when the water content of the ceramic material is too high (for example, 8%), the ceramic material containing too much water therein makes the molding rate of the ceramic body after pressing with the ceramic pressing mold 100%, but the defective rate such as cracking and porosity after firing becomes 20%, so that the ceramic material having too high water content is not suitable as a material for pressing the ceramic pressing mold.

In summary, it can be seen from the analysis of the experimental data in fig. 5 that when the water content of the ceramic raw material is controlled to be between 3.5% and 5.5%, the press forming rate of the ceramic raw material is greater than 95% and the cracking or porosity failure rate is less than or equal to 5%, so that when the ceramic raw material with the water content of between 3.5% and 5.5% is used as the raw material for pressing the ceramic mold, the final yield of the ceramic raw material is greater than or equal to 95%, and therefore the ceramic raw material with the water content of between 3.5% and 5.5% is most suitable for the ceramic raw material for pressing the ceramic mold provided in the present invention, and the yield of the manufactured ceramic raw material is the highest.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims (2)

1. A ceramic pressing die, comprising:

an upper mold fixing plate (1);

the punch (2) is fixed at the bottom of the upper die fixing plate (1) through an upper connecting block (11), and the shape of a punching part of the punch (2) is consistent with the inner cavity structure of a pressed ceramic part (9);

the lower die fixing plate (3) is arranged at the lower position of the upper die fixing plate (1);

the lower die fixing plate comprises a lower die module (4), the lower die module (4) is fixed above the lower die fixing plate (3) through a supporting block (32) and a lower connecting block (31), a pressing groove (41) is formed in the upper surface of the lower die module (4), and the structure of the pressing groove (41) is consistent with that of the outer surface of a pressed ceramic piece (9);

the guide post structure (5) is used for enabling the punch (2) to only move up and down along with the upper die fixing plate (1) in a die opening and closing state, and when the punch is in a die closing state, a cavity surrounded by the outer surface of the punching part of the punch (2) and the pressing groove (41) of the lower die module (4) is a structure for pressing the ceramic part (9);

ceramic mould still includes pan feeding structure (6), pan feeding structure (6) set up in lower connecting block (31) and in lower mould module (4), pan feeding structure (6) include:

the feeding hole (61), the feeding hole (61) transversely penetrates through the lower connecting block (31);

the wedge-shaped feeding groove (62) is formed in the surface of the lower die module (4), the lower end of the wedge-shaped feeding groove (62) is communicated with the feeding hole (61), and the upper end of the wedge-shaped feeding groove (62) is flush with the upper end of the lower die module (4);

the feeding structure (6) is used for adding ceramic raw materials required by ceramic piece pressing (9) into a pressing groove (41) of the lower die module (4);

the guide post structure (5) comprises:

the two ends of the guide post (51) are respectively fixed on the lower die fixing plate (3) and the lower connecting block (31), and the guide post (51) is perpendicular to the lower die fixing plate (3);

the sleeve plate (52) is arranged in parallel to the lower die fixing plate (3), and a through hole in sliding fit with the guide post (51) is formed in the sleeve plate (52);

the upper end and the lower end of the connecting plate (53) are respectively connected with the upper die fixing plate (1) and the sleeve plate (52);

the ceramic pressing die further comprises an automatic ejection structure, the automatic ejection structure comprises an ejection rod (7), the top of the ejection rod (7) is in sliding fit with a through hole formed in the bottom of a pressing groove (41) in the lower die module (4), the bottom of the ejection rod (7) is fixed on the guide pillar structure (5), the ejection rod (7) moves up and down along with the die opening and closing action, and when the die is closed, the top of the ejection rod (7) is flush with the bottom of the pressing groove (41) in the lower die module (4);

the ejection rod (7) is provided with a limiting section (71), the limiting section (71) is arranged below the ejection rod (7), the diameter of the limiting section (71) is larger than that of a through hole at the bottom of a pressing groove (41) of the lower die module (4), and when the die is opened, the ejection rod (7) moves upwards until the limiting section (71) is in contact with the bottom of the lower die module (4) and the die opening action is limited to be further carried out;

the ceramic pressing mould also comprises an elastic buffer structure (8),

the elastic buffer structure (8) is arranged between the upper die fixing plate (1) and the upper connecting block (11) and used for buffering impact force between the upper connecting block (11) and the lower connecting block (31) during die assembly.

2. The manufacturing method of the ceramic blank is characterized by comprising the following steps of:

preparing a ceramic raw material with the water content of 3.5% -5.5%;

adding a certain amount of the ceramic raw material with the water content of 3.5-5.5% into a pressing groove (41) of the pressed ceramic die in claim 1;

the punch head (2) of the pressing ceramic die presses the ceramic raw material to form a ceramic blank;

opening the die after the pressing is finished, and taking out the pressed ceramic blank;

and (3) putting the pressed ceramic blank into a calcining furnace for calcining, and cooling and taking out the ceramic blank after calcining.

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