Porous body high-strength rolling die and blank making process

Abstract

The invention relates to the technical field of pottery blank making, in particular to a porous body high-strength rolling die and a blank making process, a mud blank rolling die comprises an internal cavity and an external reinforcing layer, a drainage pipe network is arranged between the reinforcing layer and the cavity, the drainage pipe network is arranged between permeable layers in a penetrating mode, and the permeable layers form the inner wall of the cavity. The drainage pipe network is arranged in the water permeable layer, so that water in the mold can be discharged quickly, and curing forming of a green body is accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of pottery blank making, in particular to a porous high-strength rolling mold and a blank making process. Background Art

[0002] The roll forming process originated from spin forming, but compared to spin forming, it incorporates innovations in tool design and forming methods. Roll forming utilizes a rotating cone or cylindrical body as a rolling head. The mold containing the clay and the rolling head rotate at a constant speed around their respective axes. This rotational motion causes the clay to be both rolled and compressed by the rolling head, stretching it into a specific shape. This change makes the forming process more efficient and flexible. In addition to determining the shape and size of the final product, the mold in roll forming also requires a certain degree of water absorption. Currently, roll forming molds are typically made of ordinary gypsum. Gypsum molds have excellent water absorption, which is crucial for removing excess moisture during the ceramic forming process. However, ordinary gypsum molds are easily affected by external factors such as moisture and temperature, which can lead to a decrease in density and strength, thus shortening the mold's service life. After repeated use, moisture in the clay can roughen the mold surface, affecting the product's finish. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a porous high-strength rolling mold in response to the above-mentioned technical deficiencies. A drainage network is set in the permeable layer to accelerate the discharge of moisture in the mold, avoid clogging of the permeable layer during long-term use, facilitate the cleaning of the mold, and solve the problems of low service life and poor product forming quality of existing ordinary gypsum molds when used as rolling molds.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a porous high-strength rolling mold, including an internal cavity and an external reinforcement layer, a drainage network is provided between the reinforcement layer and the cavity, the drainage network is passed through the permeable layer, and the permeable layer constitutes the inner wall of the cavity.

[0005] To further optimize the technical solution, the reinforcement layer includes an outer shell and an inner reinforcement filling layer, and the reinforcement filling layer is arranged between the drainage network and the outer shell.

[0006] To further optimize this technical solution, the porosity of the permeable layer is 30% to 35% of the unit area, the pore size is 1 to 200 microns, the Brinell hardness of the microporous resin layer is greater than 80HB, and the flexural strength is greater than 5.5 MPa.

[0007] To further optimize this technical solution, the permeable layer is a microporous resin layer, the microporous resin layer is filled between the drainage pipe network, and the reinforced filling layer is concrete.

[0008] To further optimize this technical solution, the permeable layer and the reinforced filling layer are both made of high-strength gypsum, and the drainage pipe network is installed in the high-strength gypsum.

[0009] Further optimize this technical solution, including an upper mold body and a lower mold body, the inner walls of the upper mold body and the lower mold body jointly enclose a molding cavity, a through opening is provided at the top center of the upper mold body, an annular upper processing surface is provided on the lower side of the outer edge of the upper mold body, and an annular lower processing surface is provided on the upper side of the outer edge of the lower mold body. The upper processing surface and the lower processing surface have the same diameter, and the position where the upper mold body and the lower mold body are connected is provided with mutually interlocking step positions, and a lower step surface facing normally downward is provided on the upper middle side of the outer wall of the lower mold body, and the lower step surface is used to cooperate with the power sleeve of the rolling machine.

[0010] To further optimize this technical solution, grooves are respectively provided in the outer walls of the lower mold body and the upper mold body, and a quick connector is provided in each groove, which is connected to the drainage network. Two radially opposite mold holes are provided in the middle part of the outer side of the upper mold body, and locking holes are respectively provided on the upper and lower sides of the mating surfaces of the upper mold body and the lower mold body, and an annular fine-machined reference surface is provided on the bottom of the lower mold body.

[0011] The present invention also provides a blank making process, which uses the porous high-strength rolling die described in the above invention to roll the blank, and a consolidation stage is provided before the blank is demoulded, including positive pressure consolidation and negative pressure consolidation; Negative pressure consolidation: The wet blank after molding is connected to the quick connector through the vacuum system before demoulding to achieve communication with the drainage network in the mold, accelerate the rapid discharge of moisture in the permeable layer and the blank, and achieve negative pressure drainage consolidation of the outer wall of the blank; Positive pressure consolidation: Introduce pressurized gas into the cavity of the green body, so that the positive pressure gas is maintained in the cavity of the wet green body for a certain period of time, accelerating the discharge of moisture in the cavity of the green body to the side of the water-permeable layer, while improving the structural strength of the green body itself and completing the positive pressure consolidation of the inner wall of the green body; The green body goes through the consolidation step in the mold, which causes the green body to lose water further and improve its strength, completing the preparation of the green body and preparing it for the next green body making cycle of the mold.

[0012] To further optimize this technical solution, the time for the negative pressure consolidation and the positive pressure consolidation is 5 to 20 minutes, the pressure of the positive pressure consolidation is 0.5 to 1 MPa, and the positive pressure consolidation and the negative pressure consolidation can be carried out simultaneously or separately.

[0013] Compared with the prior art, the present invention has the following advantages: 1. By arranging a drainage network in the permeable layer, the drainage of moisture in the mold can be accelerated, the permeable layer can be prevented from being blocked during long-term use, and the cleaning of the mold is facilitated; 2. When closing the mold, the upper mold body and the lower mold body are accurately closed by the arranged step position and the engagement and alignment of the lower processing surface and the upper processing surface, thereby ensuring the smoothness of the inner wall of the cavity after closing the mold; 3. When the rolling mold is installed in the rolling machine, the installation and positioning of the rolling mold are achieved by the mutual cooperation between the lower step surface and the power sleeve of the rolling machine; 4. The microporous resin layer has fast drainage, which can greatly improve production efficiency; 5. The positive pressure consolidation and negative pressure consolidation processes accelerate the dehydration and drying of the blank, and the strength of the blank is further improved; 6. By arranging the microporous resin layer, the service life and durability of the mold are long, and the service life of the mold can reach more than 10,000 times, and it has the characteristics of high strength, strong pressure resistance, and high precision; 7. The wet blank passes through the air and water positive pressure surfaces between the model and the wet blank, and the dewetting of the wet blank is smoother, the surface of the wet blank is smooth, and a large amount of blank repairing operations are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of a porous body high-strength rolling die; Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle; Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle; Figure 4 This is a schematic diagram of the external structure of a porous high-strength rolling mold.

[0015] In the figure: 1. Cavity; 2. Reinforcement layer; 21. Shell; 22. Reinforced filling layer; 3. Drainage network; 4. Microporous resin layer; 5. Blank; 6. Upper mold body; 60. Opening; 61. Upper processing surface; 62. Step position; 63. Turning hole; 64. Locking hole; 7. Lower mold body; 71. Lower processing surface; 72. Groove; 721. Quick connector; 73. Lower step surface; 74. Finishing reference surface. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings in conjunction with specific embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0017] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings understood by persons of ordinary skill in the art to which this invention pertains. Terms such as "upper," "lower," "left," and "right" are used solely to indicate relative positions. When the absolute position of the object being described changes, the relative position may also change accordingly. Example 1

[0018] Combine Figures 1 to 4 As shown, a porous high-strength rolling die comprises an internal cavity 1 and an external reinforcement layer 2. The reinforcement layer 2 comprises an outer shell 21 and an inner reinforcement filling layer 22. A drainage network 3 is provided between the reinforcement layer 2 and the cavity 1. The drainage network 3 is interposed between the permeable layer and forms the inner wall of the cavity 1. The reinforcement filling layer 22 is disposed between the drainage network 3 and the outer shell 21. Furthermore, in this embodiment, the permeable layer is a microporous resin layer 4, which fills the drainage network 3, and the reinforcement filling layer 22 is concrete. The microporous resin layer 4 has a porosity of 30% to 35% per unit area and a pore size of 1 to 200 microns. The microporous resin layer 4 has a Brinell hardness greater than 80 HB and a flexural strength greater than 5.5 MPa. The rolling die with the above structure can be a single rotating die or a combined die composed of multiple separate dies. Different structural combinations of separate dies can be designed depending on the specific product being rolled.

[0019] This embodiment includes an upper mold body 6 and a lower mold body 7 that are assembled together. A through opening 60 is provided at the top center of the upper mold body 6. The inner walls of the upper mold body 6 and the lower mold body 7 together form the inner cavity of the complete blank 5. The upper mold body 6 and the lower mold body 7 respectively include a corresponding internal cavity 1 and an external reinforcement layer 2. The reinforcement layer 2 includes an outer shell 21 and an inner reinforcement filling layer 22. A drainage network 3 is provided between the reinforcement layer 2 and the cavity 1. The drainage network 3 is provided between the permeable layer, and the permeable layer constitutes the inner wall of the cavity 1. The reinforcement filling layer 22 is provided between the drainage network 3 and the outer shell 21.

[0020] Combine Figures 2 to 3As shown, an annular upper processing surface 61 is provided on the lower side of the outer edge of the upper mold body 6, and an annular lower processing surface 71 is provided on the upper side of the outer edge of the lower mold body 7. The upper processing surface 61 and the lower processing surface 71 have the same diameter. The position where the upper mold body 6 and the lower mold body 7 are connected is provided with a step position 62 that fits together with each other. A lower step surface 73 is provided on the upper middle side of the outer wall of the lower mold body 7 and is normally downward. Grooves 72 are provided in the outer walls of the lower mold body 7 and the upper mold body 6 respectively. A quick connector 721 is provided in each groove 72. One end of the inner side of the quick connector 721 is connected to the corresponding drainage network 3. The respective drainage networks 3 in the upper mold body 6 and the lower mold body 7 are connected to the drainage system through the corresponding quick connector 721. Two radially opposite flip-over holes 63 are provided in the middle part of the outer side of the upper mold body 6, and locking holes 64 are provided on the upper and lower sides of the mating surfaces of the upper mold body 6 and the lower mold body 7 respectively. An annular finishing reference surface 74 is provided at the bottom of the lower mold body 7.

[0021] The microporous resin layer 4 has the characteristics of fast drainage, long service life, and high strength. The reinforcing filling layer 22 can also be resin or concrete. When the concrete is combined with the microporous resin layer 4, the overall cost of the mold can be further reduced, and the fast drainage performance can be guaranteed. The drainage pressure of each part is adjustable, which ensures the uniformity of the mold humidity and is beneficial to the improvement of product quality. Back-blowing air can be used through the micropores to drain the mud particles sucked into the mold, effectively improving the service life of the mold. No drying treatment is required and continuous production is possible.

[0022] When in use, the upper mold body 6 and the lower mold body 7 can be used separately in conjunction with the rolling machine, or they can be used together after the molds are closed. The difference lies in the use of different rolling cutters. When used separately, the upper mold body 6 and the lower mold body 7 each form half of the complete blank 5, and then the molds are closed and the joints are processed. When used in combination, the corresponding locking holes 64 of the upper mold body 6 and the lower mold body 7 are used in conjunction with auxiliary connecting sleeves or plates to achieve relative fixation, which also facilitates the transportation of the mold. When the rolling mold is installed in the rolling machine, the lower step surface 73 cooperates with the rolling machine power sleeve to achieve installation and positioning of the rolling mold.

[0023] The upper mold body 6 and the lower mold body 7 are fixed to each other after the mold is closed. When closing the mold, the upper mold body 6 and the lower mold body 7 are accurately closed by the engagement and alignment of the set step position 62 and the lower processing surface 71 and the upper processing surface 61, ensuring the smoothness of the inner wall of the cavity 1 after closing the mold and the concentricity of the two cavities. Then, the drainage system is connected through the respective quick connectors 721 in the upper mold body 6 and the lower mold body 7. Example 2

[0024] A porous high-strength rolling mold. Unlike Example 1, the permeable layer and the reinforced filling layer 22 are both made of high-strength gypsum, and the drainage network 3 is inserted through the high-strength gypsum. The high-strength gypsum has a porosity of 30% to 35% per unit area and a pore size of 1 to 200 microns. The high-strength gypsum has a Brinell hardness greater than 80 HB and a flexural strength greater than 5.5 MPa. The high-strength gypsum functions similarly to the microporous resin layer 4 in Example 1, and can also achieve rapid drainage when used with the drainage network 3. Although the high-strength gypsum is slightly weaker than the microporous resin layer 4, the overall mold cost is lower. Example 3

[0025] A process for forming a blank, using the clay blank rolling mold of the above embodiment to roll the blank, further comprising a consolidation stage before demolding the blank 5, including positive pressure consolidation and negative pressure consolidation. During the negative pressure consolidation stage: before demolding, the formed wet blank is connected to the quick connector 721 via a vacuum system to achieve communication with the drainage network 3 within the mold, accelerating the rapid discharge of moisture from the permeable layer and the blank 5, and achieving negative pressure drainage and consolidation of the outer wall of the blank 5; During positive pressure consolidation, pressurized gas is introduced into the cavity of the green body 5. The positive pressure gas is maintained in the wet green body cavity for a certain period of time, accelerating the discharge of moisture from the green body 5 cavity toward the water-permeable layer. This simultaneously improves the structural strength of the green body 5 and completes the positive pressure consolidation of the inner wall of the green body 5. The negative and positive pressure consolidation processes last for 5 to 20 minutes, with a pressure of 0.5 to 1 MPa. These two processes can be performed simultaneously or separately. Through these steps of consolidation, the green body 5 further loses water and improves its strength in the mold, completing its preparation and preparing it for the next green body making cycle.

[0026] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A porous body high-strength rolling die, comprising an internal cavity (1) and an external reinforcement layer (2), characterized in that: A drainage network (3) is provided between the reinforcement layer (2) and the cavity (1), and the drainage network (3) is provided between the permeable layers, and the permeable layers constitute the inner wall of the cavity (1).

2. A porous body high-strength rolling die according to claim 1, characterized in that: The reinforcement layer (2) comprises an outer shell (21) and an inner reinforcement filling layer (22), and the reinforcement filling layer (22) is arranged between the drainage pipe network (3) and the outer shell (21).

3. A porous body high-strength rolling die according to claim 2, characterized in that: The porosity of the water-permeable layer is 30% to 35% of the unit area, and the pore size is 1 to 200 microns. The Brinell hardness of the microporous resin layer (4) is greater than 80HB, and the flexural strength is greater than 5.5 MPa.

4. A porous body high-strength rolling die according to claim 3, characterized in that: The water-permeable layer is a microporous resin layer (4), the microporous resin layer (4) is filled between the drainage pipe network (3), and the reinforced filling layer (22) is concrete.

5. The porous body high-strength rolling die according to claim 3, characterized in that: The permeable layer and the reinforced filling layer (22) are both made of high-strength gypsum, and the drainage pipe network (3) is inserted into the high-strength gypsum.

6. A porous body high-strength rolling die according to claim 4 or 5, characterized in that: The mold cavity (1) comprises an upper mold body (6) and a lower mold body (7), wherein the inner walls of the upper mold body (6) and the lower mold body (7) together form a mold cavity (1), a through opening (60) is provided at the center of the top of the upper mold body (6), an annular upper processing surface (61) is provided on the lower side of the outer edge of the upper mold body (6), and an annular lower processing surface (71) is provided on the upper side of the outer edge of the lower mold body (7), the upper processing surface (61) and the lower processing surface (71) have the same diameter, a mutually engaged step position (62) is provided at the position where the upper mold body (6) and the lower mold body (7) are connected, and a normal downward lower step surface (73) is provided on the upper side of the outer wall of the lower mold body (7), and the lower step surface (73) is used to cooperate with the power sleeve of the rolling machine.

7. The porous body high-strength rolling die according to claim 6, characterized in that: Grooves (72) are respectively provided in the outer walls of the lower mold body (7) and the upper mold body (6), and a quick connector (721) is respectively provided in each of the grooves (72), and the quick connector (721) is connected to the drainage pipe network (3). Two radially opposite mold holes (63) are provided in the middle of the outer side of the upper mold body (6), and locking holes (64) are respectively provided on the upper and lower sides of the matching surfaces of the upper mold body (6) and the lower mold body (7). The bottom of the lower mold body (7) is provided with an annular fine-machined reference surface (74).

8. A blank making process, characterized in that: The high-strength porous rolling die of claim 1 is used to roll the green body, and a consolidation stage is provided before the green body is demoulded, including positive pressure consolidation and negative pressure consolidation; Negative pressure consolidation: before demoulding, the wet blank after molding is connected to the quick connector (721) through the vacuum system to achieve communication with the drainage network (3) in the mold, accelerate the rapid discharge of water in the permeable layer and the blank, and achieve negative pressure drainage consolidation of the outer wall of the blank; Positive pressure consolidation: Introduce pressurized gas into the cavity of the green body 5, so that the positive pressure gas is maintained in the cavity of the wet green body for a certain period of time, accelerating the discharge of moisture in the green body cavity to the side of the water-permeable layer, while improving the structural strength of the green body itself, and completing the positive pressure consolidation of the inner wall of the green body; The green body goes through the consolidation step in the mold, which causes the green body to lose water further and improve its strength, completing the preparation of the green body and preparing it for the next green body making cycle of the mold.

9. A blank making process according to claim 8, characterized in that: The time for the negative pressure consolidation and the positive pressure consolidation is 5 to 20 minutes, the pressure of the positive pressure consolidation is 0.5 to 1 MPa, and the positive pressure consolidation and the negative pressure consolidation can be carried out simultaneously or separately.

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