Ceramic tile mold, pressing method and green brick

Abstract

The invention discloses a ceramic tile mold, a pressing method and a green brick, the ceramic tile mold comprises an upper mold core, a side plate and a lower mold core, the upper mold core, the side plate and the lower mold core define a mold cavity, the upper mold core comprises an upper mold body, a mold edge flange and a gradual change connecting part, the mold edge flange is formed by protruding downwards from the peripheral edge of the upper mold body, and the gradual change connecting part is connected with the upper mold body; the gradually-changing connecting part is connected to the upper die body and the die edge flange, and the section size of the gradually-changing connecting part is gradually reduced from the die edge flange to the inner side of the upper die body. According to the ceramic tile mold, through pressing of the mold edge flanges of the upper mold core, the four edges of a formed green brick sink, the compression amount of powder on the edges is larger and denser, the strength of the edges of the green brick can be improved, forward pressing forming of the green brick is achieved, edge milling and chamfering are not needed, meanwhile, the defect that powder adheres to the surface of the ceramic tile is overcome, the green brick production technological process is simplified, and the production efficiency is improved. The labor intensity of workers is relieved, and the production quality of ceramic tiles is improved.

Description

Technical Field

[0001] The present application relates to the technical field of ceramic production, and more specifically, to a ceramic tile mold, a pressing method and a tile blank. Background Art

[0002] 750×1500mm rock slab ceramic tiles have become a hot-selling product in the building ceramics industry in the past two years. Its notable features are the golden ratio, clear and smooth texture, distinct layers and rich texture, which enrich the visual experience of the space and make the space more elegant and fashionable. Building ceramics companies across the country have put on new production lines or transformed old production lines to produce 750×1500mm rock slab ceramic tiles.

[0003] At present, most of the building ceramic factories use reverse molds to press brick blanks for production, that is, the flat mold (upper mold core) is at the bottom and the back pattern mold (lower mold core) is pressed on the top. The pressing and molding process includes: laying → pressing → pushing the blank → turning the blank machine 180° (the flat surface faces upward after turning) → wiping the blank machine (wiping the powder on the blank surface during pushing the blank) → vacuuming or blowing dust, and then entering the next process.

[0004] Perhaps, a small number of ceramic factories use traditional positive mold production, that is, the flat mold is on the top and the back pattern mold is pressed on the bottom. The pressing and molding process includes: laying → pressing → pushing the blank → blank receiving machine (the blank turning table does not turn over) → milling and chamfering the edges → rotating / turning the brick blank 90° → milling and chamfering the other two edges, and then entering the next process.

[0005] If the reverse punching mode is selected for the pressing of large-sized ceramic tile blanks such as 750×1500mm and 900×1800mm, there are at least the following defects: 1. The upper mold core enters the mold cavity at a preset speed under the drive of the movable crossbeam of the press to compress the powder, which will cause a small amount of powder to overflow on the middle frame surface; 2. There is a gap between the upper mold core and the side plate of the assembly. The gap is mainly used for exhaust, which discharges the air in and between the compressed powder particles during pressing and molding to avoid interlayer defects in the blank. Blank edges are generated in the gap during pressing and molding, and part of the blank edges are generated when the pressing is completed and the blank is ejected. Falls on the middle frame surface; 3. After the pressing is completed, start the next pressing cycle, push the blank material first, in the process of pushing the blank, under the action of the deadweight of the blank and the thrust of the push plate of the material cart, the reverse surface of the blank (the blank plane is at the bottom) rubs against the middle frame surface, and some of the overflowed powder and the blank front are adhered to the blank surface. Even after the cotton blanket of the wiping machine is wiped, it is difficult to completely solve the powder sticking defect, especially when there are many sticky raw materials in the process formula and the ambient temperature is low, and the blank surface area is large, the powder sticking defect is difficult to effectively remove. In severe cases, the monthly superior product rate is affected by 2.0%, which seriously affects the economic benefits of the enterprise.

[0006] If traditional positive mold production is chosen, although the defect of powder sticking to the blank surface can be solved, its defect is that the brick blank formed by pressing is larger on the top and smaller on the bottom. During the drying, inkjet, glaze pouring, polishing and other processes after pressing by the press, it is easy to cause bumps around the brick blank, resulting in broken edges and surfaces. Therefore, in order to prevent the brick blank from breaking edges and surfaces, the brick blank needs to be milled and chamfered.

[0007] If the four sides of the brick are milled and chamfered, it is necessary to purchase a centering device and special equipment for milling and chamfering, and choose a high-speed synchronous motor for milling and chamfering, which is expensive; the milling and chamfering cutter head is a consumable and needs to be replaced after wear; the operator is required to observe the milling and chamfering effect frequently and adjust it dynamically, which is labor-intensive. If the adjustment is not in place, it may cause hidden cracks in the brick and become waste when it leaves the kiln; the milling and chamfering of the brick will generate a lot of dust, the on-site working environment is poor, it does not meet the occupational health requirements, and the difficulty of on-site equipment maintenance is also increased.

[0008] Therefore, the prior art needs to be improved. Summary of the invention

[0009] The purpose of the present application is to provide a ceramic tile mold, a pressing method and a brick blank, aiming to solve the technical problem in the prior art of how to ensure the edge strength of the brick blank so as to achieve the brick blank formed by positive pressing without the need for milling and chamfering.

[0010] To achieve the above purpose, the technical solution adopted in this application is:

[0011] In a first aspect, the present application provides a ceramic tile mold, which includes: an upper mold core, a side plate and a lower mold core, wherein the upper mold core, the side plate and the lower mold core enclose a mold cavity, and the upper mold core includes:

[0012] Upper mold body;

[0013] A mold edge flange, the mold edge flange is formed by protruding downward from the edges of the upper mold body;

[0014] A gradual connection portion is connected to the upper mold body and the mold edge flange, and the cross-sectional size of the gradual connection portion gradually decreases from the mold edge flange to the inner side of the upper mold body.

[0015] In one embodiment, the flange width of the die edge flange is 3.5-6 mm.

[0016] In one embodiment, the flange height of the die edge flange is 0.6-1.0 mm.

[0017] In one embodiment, the gradient width of the gradient connection portion is 3-5 mm.

[0018] In one embodiment, the gradually changing connecting portion comprises a gradually changing bevel body, and the gradually changing bevel body extends from the die edge flange surface to the upper die body surface.

[0019] In one embodiment, the side plate is provided with a demoulding slope inclined toward one side of the mold cavity.

[0020] In one embodiment, the demoulding slope comprises:

[0021] A first inclined surface, the first inclined surface extending downward from the top of the side plate so that the side plate is inclined toward one side of the mold cavity;

[0022] A second inclined surface, wherein the second inclined surface extends downward from the first inclined surface, and an inclination angle of the second inclined surface is greater than an inclination angle of the first inclined surface.

[0023] In one embodiment, the first inclined surface has a first inclination angle, and the second inclined surface has a second inclination angle, the first inclination angle is 2-3°, and the second inclination angle is 10-12°.

[0024] In the second aspect, based on the ceramic tile blank mold of the above embodiment, the present application also provides a pressing method of the ceramic tile mold, wherein the pressing method comprises the following steps:

[0025] For material distribution, the side plates and the lower mold core are assembled in advance to form a mold cavity, and then the feeding mechanism feeds the powder into the mold cavity;

[0026] Pressing: Pressing the powder material by applying pressure to the upper mold core to form a brick blank, so that the mold edge flange of the upper mold core is pressed downward, so that the edges of the upper surface of the brick blank have a downward sinking, and the middle of the upper surface of the brick blank is convex upward, and the sinking and the convex are connected by a gradual slope to ensure the strength and density of the brick blank;

[0027] Push the brick, the upper mold core moves upward to leave the brick, the lower mold core pushes the brick upward, and the feeding mechanism pushes the brick out of the mold cavity, completing the demoulding action and pushing the brick out.

[0028] In the third aspect, based on the ceramic tile mold described in the above embodiment, the present application also provides a tile made by a ceramic tile mold, wherein the edges around the upper surface of the tile have a downwardly sunken depression, and the middle of the upper surface of the tile is upwardly convex, and the depression and the convexity are connected by a gradual slope.

[0029] The beneficial effects of a ceramic tile mold, a pressing method and a tile blank provided by the present application are at least:

[0030] The present application discloses a ceramic tile mold, a pressing method and a tile blank, wherein the ceramic tile mold comprises: an upper mold core, a side plate and a lower mold core, wherein the upper mold core, the side plate and the lower mold core enclose a mold cavity, wherein the upper mold core comprises: an upper mold body, a mold edge flange and a gradual connection portion, wherein the mold edge flange is formed by protruding downward from the edges of the upper mold body, wherein the gradual connection portion is connected to the upper mold body and the mold edge flange, and the cross-sectional size of the gradual connection portion gradually decreases from the mold edge flange to the inner side of the upper mold body. In the present application, the ceramic tile mold is pressed by the mold edge flange of the upper mold core, and the four sides of the formed tile blank sink, and the edge powder compression amount is larger and denser, which can improve the edge strength of the tile blank, realize the positive pressing and forming of the tile blank without milling and chamfering, and solve the defect of powder sticking to the surface of the ceramic tile, simplify the production process of the tile blank, reduce the labor intensity of employees, and improve the production quality of ceramic tiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the structure of a brick blank formed by pressing a conventional ceramic brick mold provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of a ceramic tile mold provided in an embodiment of the present application;

[0034] Figure 3 A structural schematic diagram of a specific embodiment of a ceramic tile mold provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the assembly structure of a ceramic tile mold provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the pressing process of a ceramic tile mold provided in an embodiment of the present application;

[0037] Figure 6 A schematic diagram of the structure of a brick provided in an embodiment of the present application;

[0038] Figure 7 A partial three-dimensional rendering of a brick provided in an embodiment of the present application.

[0039] Among them, the reference numerals in the figure are:

[0040] 100, upper mold core; 200, side plate; 300, lower mold core; 400, mold cavity; 500, brick blank; 600, wear-resistant rubber; 110, upper mold body; 120, mold edge flange; 130, gradual connection part; 140, upper mold magnetic plate; 210, demoulding slope; 211, first slope; 212, second slope; 310, lower mold magnetic plate; 320, push-up plate; 330, bottom plate; 510, upper surface; 511, sinking; 512, protrusion; 513, gradual slope; 520, side surface; 521, first bevel; 522, second bevel; θ 1 , the first tilt angle; θ 2 , the second tilt angle; W 1 , flange width; W 2 , gradient width; H 1 , flange height; H 2 , the second tilt height; H 3 , first tilt height; S 1 , first gap; S 2 , the second gap. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0043] Embodiment 1:

[0044] See also Figure 2The present embodiment provides a ceramic tile mold, which includes: an upper mold core 100, a side plate 200 and a lower mold core 300. The upper mold core 100, the side plate 200 and the lower mold core 300 enclose a mold cavity 400. The upper mold core 100 includes: an upper mold body 110, a mold edge flange 120 and a gradual connection portion 130. The mold edge flange 120 protrudes downward from the edges of the upper mold body 110. The gradual connection portion 130 is connected to the upper mold body 110 and the mold edge flange 120. The cross-sectional size of the gradual connection portion 130 gradually decreases from the mold edge flange 120 to the inner side of the upper mold body 110.

[0045] See also Figure 1 In the prior art, the positive pressing and forming process of the brick blank 500 includes laying → pressing → pushing the blank → blank joining machine → milling and chamfering the opposite sides → rotating / turning the brick blank 90° → milling and chamfering the other two opposite sides. The side plate 200 of the ceramic tile mold has a certain demoulding slope. Only by ensuring the appropriate demoulding slope can the demoulding be carried out smoothly without causing the edges to be damaged during demoulding. Because of the demoulding slope, the brick blank 500 is larger at the top and smaller at the bottom.

[0046] Among them, the conventional upper mold core 100 is a flat mold, and the edges of the flat mold are mostly arcs of about R6, but the edge strength of the brick blank 500 formed by pressing is insufficient, and the brick blank 500 is prone to edge and surface collapse. Therefore, after the brick blank 500 is pressed and formed, in order to prevent the brick blank 500 from easily collapsing during multiple processes such as drying, inkjet, glaze pouring, and polishing after pressing by the press, it is necessary to perform a milling and chamfering process on the brick blank 500, which is a complicated process.

[0047] In this embodiment, the upper mold core 100 includes an upper mold body 110, a mold edge flange 120, and a gradual connection portion 130. During the pressing process, the mold edge flange 120 is formed by protruding downward from the edges of the upper mold body 110. The mold edge flange 120 can make the four sides of the brick 500 sink 511, so that the powder compression amount at the edge of the brick 500 is larger and denser, so that the strength of the edge of the brick 500 is improved. When the four sides of the brick 500 sink 511, the middle position of the brick 500 protrudes upward 512, and the gradual connection portion 130 makes the transition between the sinking 511 and the protruding 512 smooth during the pressing process, thereby overcoming the defect of the sudden change between the sinking 511 and the protruding 512.

[0048] Therefore, in this embodiment, the ceramic tile mold is pressed by the mold edge flange 120 of the upper mold core 100, and the four sides of the formed brick blank 500 are sunken 511, and the edge powder compression amount is larger and denser, which can improve the edge strength of the brick blank 500, and realize the positive pressing and forming of the brick blank 500 without milling and chamfering. At the same time, it solves the defect of powder sticking to the surface of ceramic tiles, simplifies the production process of the brick blank 500, reduces the labor intensity of employees, and improves the production quality of ceramic tiles.

[0049] Optionally, the flange width W of the die edge flange 120 is 1 3.5-6mm.

[0050] For example, see Figure 3 , the flange width W of the die edge flange 120 1 The flange width W1 of the die edge flange 120 can be 3.5-6 mm, that is, the flange width W1 of the die edge flange 120 can be 3.5 mm, or 4.0 mm, or 4.5 mm, or 5.0 mm, or 5.5 mm, or 6 mm. 1 The width of the mold edge flange 120 is 3.5-6 mm, which is equivalent to the width of the four sides of the brick 500 sinking 511. The brick 500 can achieve a better sinking 511 effect. For example, when the width of the mold edge flange 120 is too small, that is, the width of the formed sinking 511 is small, the brick 500 will still have edge and surface collapse in the subsequent drying, inkjet, glaze, polishing and other processes; when the width of the mold edge flange 120 is too large, the press needs to provide a higher ballast, and it has little effect on improving the edge strength of the brick 500, and the brick 500 will still have edge and surface collapse problems.

[0051] Optionally, the flange height H of the die edge flange 120 is 1 0.6-1.0mm.

[0052] For example, see Figure 3 , flange height H of die edge flange 120 1 It can be 0.6-1.0mm, that is, the flange height H1 of the mold edge flange 120 can be 0.6mm, or 0.7mm, or 0.8mm, or 0.9mm, or 1.0mm. The flange height H1 of the mold edge flange 120 1 Equivalent to the depth of the four sides of the brick 500 sinking 511, the flange height H of the mold edge flange 120 1 When the height of the mold edge flange 120 is 0.6-1.0mm, the brick blank 500 can achieve a better sinking 511 effect. For example, when the height of the mold edge flange 120 is too small, that is, the depth of the brick blank 500 sinking 511 is small, the edge powder compression is low, which has little effect on improving the edge strength of the brick blank 500, and the brick blank 500 still has the problem of edge collapse and surface collapse; when the height of the mold edge flange 120 is too small, that is, the depth of the brick blank 500 sinking 511 is large, resulting in a large protrusion 512 on the upper surface 510 of the brick blank 500, although this can improve the edge strength, but the large protrusion 512 will affect the use of the brick blank 500.

[0053] Optionally, the gradient width W of the gradient connection portion 130 is 2 3-5mm.

[0054] For example, see Figure 3 , the gradient width W of the gradient connection portion 130 2 It can be 3-5 mm, that is, the gradual width W of the gradual connection portion 130 2 It can be 3mm, 4mm, or 5mm. The gradual connection part 130 is equivalent to the transition surface between the sinking 511 and the middle protrusion 512 on the brick 500. The width of the gradual connection part 130 is 3-5mm, and the brick 500 can achieve a better sinking 511 effect. For example, for a brick 500 with a specification of 750×1500mm, the width of the sinking 511 on the four sides of the brick 500 is 3.5-6mm, and the gradual width W of the sinking 511 and the protrusion 512 is 1.5-2.5mm. 2 The middle protrusion 512 of the brick blank 500 is pressed into a plane, which ensures that the middle protrusion 512 of the brick blank 500 is the main body and does not affect the normal use of the ceramic tile. 2 When the width W of the gradual connection portion 130 is smaller, the connection between the protrusion 512 and the depression 511 is too steep and abrupt, and a step is easily formed between the depression 511 and the protrusion 512, which affects the normal use of the ceramic tile. 2 When it is relatively large, the area of ​​the protrusion 512 in the middle of the brick 500 will be relatively small, which will affect the use effect of the main body of the brick 500.

[0055] Specifically, see Figure 2 The gradually changing connecting portion 130 includes a gradually changing bevel body, and the gradually changing bevel body extends from the surface of the mold edge flange 120 to the surface of the upper mold body 110 .

[0056] In this embodiment, the gradual slope makes the transition between the sink 511 and the protrusion 512 of the brick 500 smooth and gentle, overcoming the defect of the sudden change between the sink 511 and the protrusion 512. For example, after pressing, the top of the sink 511 of the brick 500 is connected to the top of the protrusion 512 via the slope, overcoming the defect of the sudden change between the sink 511 and the protrusion 512, improving the edge strength, and avoiding the edge collapse and surface collapse phenomenon.

[0057] Specifically, see Figure 3 The lower surface of the upper mold core 100 and the upper surface 510 of the lower mold core 300 are both provided with wear-resistant rubber 600 to protect the mold. The wear-resistant rubber 600 can be understood as the prior art, and the specific structure of the wear-resistant rubber 600 is not repeated.

[0058] Specifically, see Figure 2 The side plate 200 is provided with a demoulding inclined surface 210 inclined toward one side of the mold cavity 400.

[0059] In this embodiment, the powder is formed into a brick blank 500 after being pressed, and the side panel 200 is provided with a demolding slope 210 inclined on one side of the mold cavity 400. The demolding slope 210 directly affects the smooth demolding of the brick blank 500 and the quality of the finished product. For example, the brick blank 500 formed in this way is larger at the top and smaller at the bottom, which facilitates the brick blank 500 to be smoothly pushed upward by the lower mold core 300 to complete the pushing process.

[0060] Specifically, see Figure 2 The demolding slope 210 includes: a first slope 211 and a second slope 212. The first slope 211 extends downward from the top of the side plate 200 so that the side plate 200 is inclined toward the mold cavity 400. The second slope 212 extends downward from the first slope 211, and the inclination angle of the second slope 212 is greater than the inclination angle of the first slope 211.

[0061] In this embodiment, the first slope 211 is located at the upper part of the side plate 200. The first slope 211 serves to guide the brick blank 500 to be demolded. When the lower mold core 300 is opened and pushed upward, the first slope 211 first contacts the brick blank 500 and gradually separates the brick blank 500 from the mold. The angle of the first slope 211 is usually small to reduce the friction during the initial demolding. Once the brick 500 starts to move along the first slope 211, the second slope 212 continues to guide the brick 500 to complete the demolding process. The second slope 212 is located at the lower part of the side plate 200. Therefore, the friction force at the second slope 212 is relatively large when the brick 500 is demolded. The inclination angle of the second slope 212 is usually larger than that of the first slope 211 so as to provide a greater demolding force to ensure that the brick 500 can be completely separated from the mold. This design can improve the demolding efficiency, reduce the demolding time, thereby improving production efficiency, and avoid damage to the brick 500 during the demolding process, thereby improving the production quality of the brick 500.

[0062] Optionally, the first inclined surface 211 has a first inclination angle θ 1 The second inclined surface 212 has a second inclination angle θ 2 , the first tilt angle θ 1 The second inclination angle θ is 2-3°. 2 It is 10-12°.

[0063] For example, see Figure 3 The first inclined surface 211 has a first inclination angle θ 1 The second inclined surface 212 has a second inclination angle θ 2 , the first tilt angle θ 1 The second inclination angle θ is 2-3°. 2The total height of the side plate 200 is 24 mm, the height of the first inclined surface 211 is 20.5 mm, and the height of the second inclined surface 212 is 3.5 mm. During the powder pressing process, the brick 500 is at the first inclined height H of the first inclined surface 211. 3 is 5 mm, and the second inclination height H of the second inclined surface 212 is 2 The first bevel 211 is located at the upper part of the side plate 200, and the angle of the first bevel 211 is usually smaller to reduce the friction during the initial demoulding. The second bevel 212 is located at the lower part of the side plate 200, and the inclination angle of the second bevel 212 is usually larger than that of the first bevel 211, so as to provide a greater demoulding force to ensure that the brick 500 can be completely separated from the mold.

[0064] For example, the flange width W1 of the mold edge flange 120 is 3.5 mm, the flange height H1 of the mold edge flange 120 is 0.7 mm, and the gradual width W1 of the gradual connection portion 130 is 0.7 mm. 2 The first inclination height H of the first inclined surface 211 of the brick 500 is 3 mm. 3 is 5 mm, and the second inclination height H of the second inclined surface 212 is 2 is 3.5 mm, the first inclination angle θ 1 is 2.5°, the second inclination angle θ 2 The four sides of the brick 500 formed by the ceramic brick mold are sunken 511, and the edge powder compression is larger and denser, which can improve the edge strength of the brick 500, realize the positive pressing and forming of the brick 500 without milling and chamfering, and the side plate 200 has a certain demoulding slope, ensuring a suitable demoulding slope, so as to smoothly demould and prevent the edge from being damaged.

[0065] Embodiment 2:

[0066] The ceramic tile blank mold based on the above embodiment, please refer to Figure 5 The present application also provides a method for pressing a ceramic tile mold, comprising the following steps:

[0067] S100 , laying materials, assembling the side plate 200 and the lower mold core 300 to form a mold cavity 400 in advance, and then the feeding mechanism feeds the powder into the mold cavity 400 .

[0068] S200, pressing, pressing the powder by applying pressure through the upper mold core 100 to form a brick 500 ( Figure 6 ), so that the mold edge flange 120 of the upper mold core 100 is pressed downward, so that the upper surface 510 of the brick 500 has a downwardly sunken depression 511 around the edge, and the middle of the upper surface 510 of the brick 500 is upwardly convex, and the depression 511 and the convex 512 are connected by a gradual slope 513 to ensure the strength and density of the brick 500.

[0069] S300, push the blank, the upper mold core 100 moves upward away from the brick blank 500, the lower mold core 300 pushes the brick blank 500 upward, and the feeding mechanism pushes the brick blank 500 out of the mold cavity 400, completing the demoulding action and pushing the brick blank 500 out.

[0070] In step S100, please combine Figure 3 As shown in FIG. 1 , the side plate 200 and the lower mold core 300 are assembled in advance to form the mold cavity 400, so that the side plate 200 and the lower mold core 300 are provided with a first gap S 1 , and a second gap S is reserved between the side plate 200 and the upper mold core 100 2 , and then the feeding mechanism feeds the powder into the mold cavity 400. For example, the first gap S 1 The range of the second gap S can be 0.1-0.5mm. 2 The range of the first gap S can be 0.1-0.5 mm. 1 and the second gap S 2 Both are used for exhaust. When the powder is made into powder by the spray drying tower, the powder has the shape of hollow particles, solid particles, shrunken particles, solid particles, split particles, etc. There are also gaps between the particles, that is, there is air. Therefore, during the pressing process, the air needs to be discharged, otherwise it will gather inside the pressed body and form interlayer defects, which will become waste. Preferably, the first gap S 1 The second gap S can be 0.3 mm. 2 It can be 0.24mm to facilitate exhaust during pressing.

[0071] In step S200, the powder is compressed by applying pressure through the upper mold core 100, wherein the powder can be compressed by applying pressure through the upper mold core 100 for multiple times, for example, the powder can be compressed twice, three times, or five times.

[0072] When pressing twice, low pressure pressing is used for the first time, and high pressure pressing is used for the second time. For example, the pressing pressure of the first pressing is 2.3 MPa, and the pressing pressure of the second pressing is 25.2 MPa.

[0073] When pressing three times, please combine Figure 4 As shown in FIG. , during the first pressing, the upper mold core 100 can rely on its own weight to enter the mold cavity 400 and press the powder material, so that the first gap S 1 , the second gap S 2Expel part of the gas; during the second pressing, low-pressure pressing can be used for shrinkage, and then the upper mold core 100 is slightly lifted to fully exhaust the gas; during the third pressing, high-pressure pressing can be used to press the powder for the third time to form a brick blank 500, so that the mold edge flange 120 of the upper mold core 100 is pressed downward, so that the edges of the upper surface 510 of the brick blank 500 have a downwardly sunken depression 511, and the middle of the upper surface 510 of the brick blank 500 has an upward protrusion 512, and the sinking 511 and the protrusion 512 are connected by a gradual slope 513 to ensure the strength and density of the brick blank 500. For example, the pressing pressure of the second pressing is 2.3MPa, and the pressing pressure of the third pressing is 25.2MPa.

[0074] During the five pressings, the first pressing is performed at low pressure, the second, third and fourth pressings are performed at medium pressure, and the fifth pressing is performed at high pressure.

[0075] In this embodiment, the side plate 200 is fixed on the bottom plate 330, and the side plate 200 is stationary. The upper mold core 100 can be moved up and down, and the lower mold core 300 can also be moved up and down within a certain range.

[0076] During the material distribution process, taking three pressings as an example, the upper mold core 100 is magnetically attracted by the upper mold magnetic plate 140, and the lower mold core 300 is magnetically attracted by the lower mold magnetic plate 310, and the side plate 200, the upper mold core 100 and the lower mold core 300 are enclosed to form a mold cavity 400, and the powder is distributed into the mold cavity 400 through the feeding mechanism. Then, the upper mold magnetic plate 140 and the upper mold core 100 are driven by the movable crossbeam of the press to enter the mold cavity 400 to contact the powder and perform the first pressing. Then, the upper mold core 100 is slightly lifted to leave the compressed powder for exhaust, and then pressure is applied for the second pressing. Then, the upper mold core 100 is slightly lifted again to leave the compressed powder for exhaust, and then pressure is applied for the third pressing, until the brick 500 reaches sufficient strength and good density. After the pressing is completed, the upper mold core 100 moves upward away from the brick blank 500 and is pushed upward by the push plate 320, so that the lower mold core 300 pushes the brick blank 500 upward, and the feeding mechanism pushes the brick blank 500 out of the mold cavity 400 to enter the next process.

[0077] The side panel 200 has a certain demoulding slope. To ensure a suitable demoulding slope, demoulding can be carried out smoothly without causing edge damage during demoulding. For example, the side panel 200 includes a first inclined surface 211 and a second inclined surface 212. The first inclined surface 211 extends downward from the top of the side panel 200, so that the side panel 200 is inclined toward one side of the mold cavity 400. The second inclined surface 212 extends downward from the first inclined surface 211. The first inclination angle θ of the first inclined surface 211 is 1 The second inclination angle θ of the second inclined surface 212 is 2-3°. 2The height of the second inclined surface 212 is 3.5mm and the angle is 10-12°. Because of the demoulding slope, the brick blank 500 is larger at the top and smaller at the bottom during the whole production line, which may cause the brick blank surface to collide and collapse. Therefore, it is necessary to provide a mold edge flange 120 and a gradual connection part 130 on the upper mold core 100, so that the four sides of the upper surface 510 of the brick blank 500 sink 511, and the edge powder compression is larger and denser, which can improve the edge strength of the brick blank 500 and realize the positive pressing and molding of the brick blank 500 without milling and chamfering.

[0078] In one embodiment, the pressing method based on the ceramic tile mold in the specific embodiment of the present application includes the following steps:

[0079] S11, laying the material, assembling the side plate 200 and the lower mold core 300 to form a mold cavity 400 in advance, so that a first gap is set between the side plate 200 and the lower mold core 300, and a second gap is reserved between the side plate 200 and the upper mold core 100, and then the feeding mechanism feeds the powder into the mold cavity 400.

[0080] S12, pressing, the upper mold core 100 enters the mold cavity 400, the first pressing, relying on the main piston (not shown in the figure), the movable crossbeam (not shown in the figure), the upper mold magnetic plate 140, the upper mold core 100's own weight and the compressed air pressure to compress the powder for the first time, and discharge part of the gas through the first gap between the lower mold core 300 and the side plate 200, and the second gap between the upper mold core 100 and the side plate 200; the second pressing adopts low-pressure pressing, the powder is further compressed, and then the upper mold core 100 is slightly lifted to fully exhaust; The third pressing adopts high-pressure pressing, so that the mold edge flange 120 of the upper mold core 100 is pressed downward, so that the edges around the upper surface 510 of the brick blank 500 have a sinking 511 that is sunken 511, and the middle of the upper surface 510 of the brick blank 500 has an upward protrusion 512, and the sinking 511 and the protrusion 512 are connected by a gradual slope 513 to ensure the strength and density of the brick blank 500. For example, the pressing pressure of the second pressing can be 2.3MPa, and the pressing pressure of the third pressing can be 25.2MPa.

[0081] S13, pushing the blank, the upper mold core 100 moves upward away from the brick blank 500, and the lower mold core 300 pushes the brick blank 500 upward, and the feeding mechanism pushes the brick blank 500 to leave the mold cavity 400, completing the demoulding action and pushing the brick blank 500 out.

[0082] This embodiment improves the edge strength of ceramic tile blanks by 500, and will not cause edge collapse and surface collapse due to slight bumps in the entire production line and kiln. It simplifies the process flow, solves the problem of powder sticking on the surface of ceramic tiles, and does not require additional investment in equipment such as centering milling and chamfering devices and blank rubbing machines, thereby reducing the labor intensity of employees, improving the occupational health environment, and increasing the rate of high-quality products, thereby enhancing the market competitiveness of products and improving the economic benefits of enterprises.

[0083] Embodiment 3:

[0084] The ceramic tile blank mold based on the above embodiment, please refer to Figure 6 The present application also provides a brick 500 made of a ceramic brick mold, wherein the edges of the upper surface 510 of the brick 500 have a sink 511 that is sunken downward, and the middle of the upper surface 510 of the brick 500 has an upward protrusion 512, and the sink 511 and the protrusion 512 are connected by a gradual slope 513.

[0085] In this embodiment, the four sides of the brick blank 500 are sunken 511, and the edge powder compression is larger and denser, which can improve the edge strength of the brick blank 500, realize the positive pressing and molding of the brick blank 500 without milling and chamfering, and solve the defect of powder sticking to the surface of ceramic tiles, simplify the production process of the brick blank 500, reduce the labor intensity of employees, and improve the production quality of ceramic tiles.

[0086] See also Figure 6 and Figure 7 The side surface 520 of the brick blank 500 may have a first bevel 521 and a second bevel 522. The first bevel 521 is formed by pressing the first bevel 211 of the side panel 200, and the second bevel 522 is formed by pressing the second bevel 212 of the side panel 200. This allows the side surface 520 of the brick blank 500 to have a certain demolding slope for smooth demolding without causing edge damage.

[0087] For example, the width of the sinking 511 of the brick blank can be 3.5-6mm; the height of the protrusion of the brick blank can be 0.6-1.0mm, the width of the gradual slope 513 can be 3-5mm, the height of the first bevel 521 can be 5mm, the height of the second bevel 522 can be 3.5mm, the inclination angle of the first bevel can be 2-3°, and the inclination angle of the second bevel can be 10-12°.

[0088] In summary, the present application discloses a ceramic tile mold, a pressing method and a tile blank, wherein the ceramic tile mold comprises: an upper mold core, a side plate and a lower mold core, the upper mold core, the side plate and the lower mold core enclose a mold cavity, the upper mold core comprises: an upper mold body, a mold edge flange and a gradual connection portion, the mold edge flange is formed by protruding downward from the edges of the upper mold body, the gradual connection portion is connected to the upper mold body and the mold edge flange, and the cross-sectional size of the gradual connection portion gradually decreases from the mold edge flange to the inner side of the upper mold body. In the present application, the ceramic tile mold is pressed by the mold edge flange of the upper mold core, and the four sides of the formed tile blank sink, the edge powder compression amount is larger and denser, the edge strength of the tile blank can be improved, and the positive pressing and forming of the tile blank can be realized without milling and chamfering, and at the same time, the defect of powder sticking to the surface of the ceramic tile is solved, the production process of the tile blank is simplified, the labor intensity of employees is reduced, and the production quality of ceramic tiles is improved.

[0089] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A ceramic tile mold, characterized in that: include: An upper mold core, a side plate and a lower mold core, wherein the upper mold core, the side plate and the lower mold core enclose a mold cavity, and the upper mold core comprises: Upper mold body; A mold edge flange, the mold edge flange is formed by protruding downward from the edges of the upper mold body; A gradual connection portion is connected to the upper mold body and the mold edge flange, and the cross-sectional size of the gradual connection portion gradually decreases from the mold edge flange to the inner side of the upper mold body.

2. The ceramic tile mold according to claim 1, characterized in that: The flange width of the die edge flange is 3.5-6 mm.

3. The ceramic tile mold according to claim 1, characterized in that: The flange height of the die edge flange is 0.6-1.0 mm.

4. The ceramic tile mold according to claim 1, characterized in that: The gradient width of the gradient connection portion is 3-5 mm.

5. The ceramic tile mold according to claim 1, characterized in that: The gradually changing connecting portion comprises a gradually changing bevel body, and the gradually changing bevel body extends from the die edge flange surface to the upper die body surface.

6. The ceramic tile mold according to claim 1, characterized in that: The side plate is provided with a demoulding inclined surface inclined toward one side of the mold cavity.

7. The ceramic tile mold according to claim 6, characterized in that: The demoulding slope comprises: A first inclined surface, the first inclined surface extending downward from the top of the side plate so that the side plate is inclined toward one side of the mold cavity; A second inclined surface, wherein the second inclined surface extends downward from the first inclined surface, and an inclination angle of the second inclined surface is greater than an inclination angle of the first inclined surface.

8. The ceramic tile mold according to claim 7, characterized in that: The first inclined surface has a first inclination angle, and the second inclined surface has a second inclination angle. The first inclination angle is 2-3°, and the second inclination angle is 10-12°.

9. A method for pressing a ceramic tile blank mold according to any one of claims 1 to 8, characterized in that: The pressing method comprises the following steps: For material distribution, the side plates and the lower mold core are assembled in advance to form a mold cavity, and then the feeding mechanism feeds the powder into the mold cavity; Pressing: Pressing the powder material by applying pressure to the upper mold core to form a brick blank, so that the mold edge flange of the upper mold core is pressed downward, so that the edges of the upper surface of the brick blank have a downward sinking, and the middle of the upper surface of the brick blank is convex upward, and the sinking and the convex are connected by a gradual slope to ensure the strength and density of the brick blank; Push the brick, the upper mold core moves upward to leave the brick, and the lower mold core pushes the brick upward. The feeding mechanism pushes the brick out of the mold cavity, completing the demoulding action and pushing the brick out.

10. A brick blank made based on the ceramic brick blank mold according to any one of claims 1 to 8, characterized in that: The edges around the upper surface of the brick blank are provided with downwardly sunken depressions, and the middle of the upper surface of the brick blank is upwardly convex, and the depressions and the convexities are connected by a gradual slope.

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