Die for ceramic powder pressing die

Abstract

The utility model provides a mold for a ceramic powder pressing mold. In order to solve the problems of tedious technology and high production cost in the traditional mold, the utility model provides a simple and easy-to-process mold. The die comprises an inner die, an outer die, a lower die cushion, an upper punch and a hexagon bolt. The two half outer mold blocks of the outer mold are used for wrapping the inner mold which is equally divided into the three inner mold blocks, the bolts are fixed on the flange faces on the two sides of the outer mold blocks in a crossed mode, the fixing effect on the inner mold is enhanced, the mold can be more stable in the using process, and the powder tabletting quality can reach the standard in the rapid mold pressing process.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic powder material molding, in particular to a ceramic powder pressing die. Background Art

[0002] The simplest and most common methods for forming ceramic powder materials are: compression molding (also known as dry pressing) and isostatic pressing. Isostatic pressing is mostly used for products with relatively thick thickness and high performance requirements. It has high requirements on equipment and the operation process is cumbersome. For example, the isostatic pressing described in Chinese patent CN 115503082 A requires two stages of pre-pressing in a specific pre-pressing mold and subsequent pressing in a polyurethane isostatic pressing mold. Before pressing in the polyurethane isostatic pressing mold, it is necessary to place the entire material in the corresponding tooling. Although the isostatic pressing method can subject the powder material to three-dimensional compressive stress, thereby improving its formability and quality, it requires the design of specific molds and tooling, the entire process is cumbersome, and the production cost is significantly increased.

[0003] The compression molding process is fast, low-cost and easy to operate. Therefore, how to complete the compression molding process in a simple, easy-to-operate and low-cost manner without introducing impurities has become a practical problem that needs to be solved at present. The utility model is based on solving this problem and can achieve the powder tabletting to be as uniformly stressed as possible in all directions, while preventing the powder tabletting from stratification and fracture, and reaching the corresponding quality standards. Summary of the invention

[0004] The purpose of the invention of the utility model: in view of the background technology, the utility model, through reasonable mold design, on the basis of simple operation and low cost, makes the molding performance of ceramic powder for thermal barrier coating pressed out of the mold reach ideal values, and further realizes that the quality of powder tableting can meet the standards while rapid molding.

[0005] The technical solution of the utility model is as follows: In order to solve the problems of cumbersome technology and high production cost in the background technical solution, a simple and easy-to-process mold is invented, which can achieve non-stratification and non-fracture of powder and reach the corresponding quality standards. The mold of the utility model includes an inner mold, an outer mold, a lower mold pad, and an upper mold punch. The inner mold divided into three inner modules is wrapped by using the two half outer modules of the outer mold, and the lower mold pad and the upper mold punch are inserted into the center hole of the inner mold. The flange surfaces on both sides of the outer module are cross-fixed by bolts to strengthen the fixing effect of the inner mold, which can make the mold more stable during use, and the quality of powder tableting can meet the standards during rapid molding. The inner mold is composed of three identical inner modules. By using the positioning structure between the joint surfaces of the inner modules, the inner modules can be tightly spliced, which can make the mold easier to operate during use.

[0006] On the basis of the above technical solution, the present invention can also make the following improvements.

[0007] Furthermore, the inner mold is composed of a plurality of identical inner modules, and the inner mold is a circular ring-shaped inner mold divided into three equal parts.

[0008] The beneficial effect of adopting the above further solution is that the partitioned inner mold can be easily disassembled, and the product in the middle hole can be disassembled without affecting it.

[0009] Furthermore, the bottom surface of the inner mold is provided with a positioning structure at three equal parts. The height of the positioning structure in the axial direction should be less than the height of the upper mold above the top surface of the inner mold after compaction. The middle hole diameter is determined according to the diameter of the powder to be pressed, and the single-side slope in the hole is guaranteed to be between 5um and 30um. The thickness of the ring should be able to ensure sufficient strength and rigidity during the entire pressing process.

[0010] The beneficial effect of adopting the above further solution is that after the inner mold is divided into three equal parts, the positioning structure can be used for accurate splicing during assembly.

[0011] Furthermore, the lower mold pad is a stepped cylinder, which is composed of two upper and lower cylinders. The diameter of the lower cylinder is larger than the diameter of the upper cylinder, and the large cylinder diameter of the lower mold pad should be smaller than the outer diameter of the inner mold.

[0012] The beneficial effect of adopting the above further solution is to ensure that there is sufficient working space when pressing the module edge of the inner mold during the local demoulding process after the pressing is completed.

[0013] Furthermore, the upper die punch is a stepped cylindrical shape, and the diameter of the small cylinder differs from that of the large cylinder by 0.5 mm to 10 mm.

[0014] The beneficial effect of adopting the above further solution is that it is easier to pull the upper punch out of the inner hole of the inner die by reducing the contact surface.

[0015] Furthermore, the upper bottom surface of the lower cylinder of the lower mold pad is flush with the bottom surface of the inner mold.

[0016] The beneficial effect of adopting the above further solution is that the planes are consistent, the product can be extruded and formed more tightly and more stably.

[0017] Furthermore, the upper and lower surfaces of the inner mold and the outer mold are both on the same plane.

[0018] The beneficial effect of adopting the above further solution is that the entire mold is in a plane, and the mold is stable when used and is not prone to tilting.

[0019] Furthermore, the outer mold is a circular ring divided into two equal parts, and its inner hole is closely matched with the outer wall of the inner mold, and its height is consistent with the height of the inner mold. A flange surface is opened on the outer wall of the outer mold, and the width of the flange surface ensures that the hexagonal nut has sufficient working space. The outer mold divided into two equal parts has four symmetrical bolt holes opened on the flange surface, and the hexagonal bolts are used to tightly connect the two halves of the outer mold together through the bolt holes.

[0020] The beneficial effects of adopting the above further solution are: enhancing the stability of the outer mold fixation and facilitating disassembly.

[0021] Furthermore, the cross section of the inner module is fan-shaped.

[0022] The beneficial effect of adopting the above further solution is that the fan-shaped inner modules can directly form an inner mold to form a circular ring structure with a perfect fit.

[0023] Furthermore, the working pressure of the mold during forward pressing reaches 8-18 MPa.

[0024] The beneficial effect of adopting the above further solution is that the appropriate working pressure can quickly and effectively press the powder into the required product.

[0025] The beneficial effects of the utility model are: by using the detachable inner and outer molds, both of which are composed of the same small modules, the positioning structure of the inner membrane is used to facilitate installation and positioning, so that the equipment can be more tightly fitted. The problems of complicated technology and high production costs in the background technology scheme are improved, and a simple and easy-to-process mold is improved to match the corresponding pressing method, so as to achieve the innovative purpose of achieving the quality of powder tableting while quickly pressing and forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a three-dimensional structural device diagram of a mold for ceramic powder compression molding according to the utility model.

[0027] Figure 2 The utility model is a cross-sectional view of a mold for ceramic powder compression molding.

[0028] Figure 3 It is a partial schematic diagram of an inner mold of a ceramic powder pressing mold of the utility model.

[0029] Figure 4 A three-dimensional exploded view of an inner mold of a ceramic powder pressing mold of the utility model.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows: outer mold 101 , bolt 102 , inner mold 201 , upper mold punch 202 , lower mold pad 203 , and positioning structure 204 . DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] like Figure 1 As shown, in the first aspect of the utility model, a mold for ceramic powder pressing is proposed. A simple and easy-to-process mold is combined with a corresponding pressing method to achieve powder without stratification and fracture, and reach the corresponding quality standards. In view of the background technology, the utility model, through reasonable mold design, on the basis of simple operation and low cost, makes the molding performance of ceramic powder for thermal barrier coating pressed out by the mold reach the ideal value, and further achieves that the quality of powder tableting can meet the standards while rapid compression molding. To solve the problems of cumbersome technology and high production cost in the background technology solution, a simple and easy-to-process mold is invented, which can achieve powder without stratification and fracture, and reach the corresponding quality standards. The mold includes an inner mold 201, an outer mold 101, a lower mold pad 203, and an upper die punch 202. Among them, the outer mold 101 and the inner mold 201 mainly play the role of fixing the die, and the upper die punch 202 and the lower die pad 203 play the role of extrusion molding. In the fixation of the inner mold 201, the upper die punch 202 and the lower die pad 203 are squeezed at the inner mold hole to generate pressure to shape the product and press the required ceramic powder into the required product, while the outer mold 101 is fixed on the basis of the fixation of the inner mold 201, and the inner mold 201 is wrapped by two semi-circular rings for secondary fixation. By using the two half outer modules of the outer mold to wrap the inner mold 201 divided into three inner modules, and cross-fixing the flange surfaces on both sides of the outer module with bolts, the fixing effect of the inner mold 201 is strengthened, which can make the mold more stable during use, and the quality of powder tableting can meet the standards during rapid molding. The inner mold 201 is composed of three identical inner modules. By using the positioning structure 204 between the joint surfaces of the inner modules, the inner modules can be tightly spliced, which can make the mold easier to operate during use.

[0033] The specific operation process is as follows: First, the inner mold 201 divided into three parts is spliced ​​together according to the positioning structure 204. Then the two halves of the outer mold 101 are put on the inner mold to ensure that the upper and lower surfaces of the inner and outer molds are on the same plane. Bolts 102 are installed at the flange of the outer mold 101, and the nuts are tightened in a cross order to finally ensure that the two halves of the outer mold fit tightly without gaps. Second, the lower mold pad 203 is placed in the inner hole of the inner mold so that the bottom surface of the inner mold 201 is flush with the bottom surface of the lower mold pad 203, and the ceramic powder is slowly and evenly added to the inner mold hole, and then the mold is placed on a flat workbench as a whole, shaken left and right, so that the ceramic powder is evenly spread in the inner mold 201 without bulges, and then the upper die punch 202 is inserted. Third, slowly shake the manual tablet press handle up and down to slowly increase the pressure. When the pressure reaches 8-18MPa, stop pressurizing and maintain the pressure at this pressure for 3-7min. After the pressure is maintained, continue to tighten the outer mold nut, and the tightening sequence is carried out in a cross order. This process is the first stage of powder pressing, that is, forward pressing. Fourth, remove the pressure, turn the mold as a whole, make the upper die punch contact the workbench, and ensure that the mold as a whole does not fall over. Shake the manual tablet press handle up and down to slowly increase the pressure, but ensure that the pressure is lower than the forward pressing pressure (3-6MPa), stop pressurizing, and maintain the pressure for 4-9min. This process is the second stage of powder pressing, that is, reverse pressing. Fifth, reduce the tablet press pressure to 0.5-2MPa. Remove the bolts of the outer mold flange and remove the outer mold. From the bottom surface of the inner mold 201, press the edge of one of the three inner molds (at this time, the mold is in a bottom-up state, that is, press down from the top) to remove one of the inner molds. In the same way, take off the other inner mold. Finally, the tablet press completely relieves the pressure, removes the lower mold pad, and a complete ceramic sheet without cracks can be obtained.

[0034] In a specific embodiment of the utility model, Figure 1 It can be seen from the overall three-dimensional structure device diagram that the inner mold 201 is composed of several identical inner modules, and the inner mold 201 is a circular inner mold divided into three equal parts. The partitioned inner mold can be easily disassembled, and it can be done without affecting the product in the middle hole during disassembly. By using the three-part inner mold structure, it is possible to take out the inner modules of the small blocks on one side separately after the die-casting process is completed, and the small-area removal gap module can remove the inner mold without damaging the die-cast product. The fan-shaped inner module has a small inner diameter and a large outer diameter, so the inner module can be taken out in blocks conveniently and labor-savingly to avoid damaging the product by excessive force.

[0035] In a specific embodiment of the utility model, Figure 3The bottom surface of the inner mold 201 shown is provided with a positioning structure 204 at the three-division point. The height of the positioning structure 204 along the axial direction should be less than the height of the upper mold above the top surface of the inner mold 201 after being punched and compacted. The middle hole diameter is determined according to the diameter of the powder to be pressed, and the single-side slope in the hole is guaranteed to be between 5um and 30um. The thickness of the ring should be able to ensure sufficient strength and rigidity during the entire pressing process. After the inner mold 201 is divided into three equal parts, it can be accurately spliced ​​using the positioning structure during assembly.

[0036] In a specific embodiment of the utility model, Figure 2 The lower mold pad 203 shown is a stepped cylinder, and the large cylindrical diameter of the lower mold pad 203 should be smaller than the outer diameter of the inner mold 201. This is to ensure that there is sufficient space to press the module edge of the inner mold 201 during the local demolding process after the pressing is completed. In the specific operation, after the molding step is completed, it is necessary to press the edge of one of the three inner molds from the bottom surface of the inner mold 201 (at this time, the mold is in a bottom-up state, that is, pressing down from the top) to remove one of the inner molds. In the same way, take off the other inner molds. If the large cylindrical diameter of the lower mold pad 203 is larger than the outer diameter of the inner mold 201, although the mold stability is increased, the inner mold cannot be safely removed. In summary, the large cylindrical diameter of the lower mold pad 203 should be smaller than the outer diameter of the inner mold, so that there is room for the inner mold to be removed.

[0037] In a specific embodiment of the utility model, Figure 2 The lower die pad 203 shown is a stepped cylinder, and the large cylindrical diameter of the lower die pad 203 should be 10mm to 30mm smaller than the outer diameter of the inner die 201. To ensure that there is sufficient operating space when pressing the module edge of the inner die 201 during the local demoulding process after the pressing is completed, the technicians can easily and labor-savingly demould without damaging the internal die-molded products, improve work efficiency, and ensure product quality. In the specific operation, after the die-molding step is completed, it is necessary to press the edge of one of the inner molds in the three equal parts of the inner mold from the bottom surface of the inner mold 201 (at this time, the mold is in a bottom-up state, that is, press down from the top) to remove one of the inner molds. In the same way, remove the other inner molds. If the large cylindrical diameter of the lower die pad 203 is larger than the outer diameter of the inner mold 201, although the mold stability is increased, the inner mold cannot be safely removed. In summary, the large cylindrical diameter of the lower die pad 203 should be smaller than the outer diameter of the inner mold, giving room for the inner mold to be removed.

[0038] In a specific embodiment of the utility model, Figure 2The upper punch 202 shown is a stepped cylindrical type, and the diameter of the small cylinder differs from that of the large cylinder by 0.5mm to 10mm. The stepped cylindrical upper punch 202 can be effectively and conveniently operated during use. The difference in the diameter of the large and small cylinders of the upper punch 202 is equivalent to reducing the contact surface to facilitate the upper punch 202 to be pulled out from the inner hole of the inner mold 201. The outer diameter of the small cylinder and the inner hole diameter of the inner mold are clearance-matched, and the clearance should ensure that the air trapped between the powders during the compression of the ceramic powder is effectively removed, and at the same time, it is necessary to ensure that the lower die pad 203 can be smoothly separated from the inner mold after the ceramic powder is pressed. The top plane where the small cylinder of the lower die pad 203 is in direct contact with the ceramic powder should be guaranteed to have a qualified roughness (generally the roughness should not be greater than 3.2).

[0039] In a specific embodiment of the utility model, Figure 2 The lower die pad 203 is a stepped cylindrical type, wherein the upper bottom surface of the large cylinder with a larger diameter in the lower half of the lower surface 203 is flush with the bottom surface of the inner die 201. The planes match each other, and the product can be extruded and formed more accurately and more stably. During operation, the mold is fixed in the inner die 201, and the upper die punch 202 and the lower die pad 203 are extruded at the inner die hole to generate pressure to shape the product, and the required ceramic powder is pressed into the required product. The upper bottom surface of the large cylinder with a larger diameter in the lower half of the lower surface 203 is flush with the bottom surface of the inner die 201. During operation, the flush bottom surface can effectively stabilize the mold in the working state, and the large cylinder diameter of the lower die pad is smaller than the inner die diameter, so that the large cylinder of the lower surface can play the role of a support point, and also play the role of smaller contact area and greater pressure, which is more labor-saving and simple to operate in the die pressing operation.

[0040] In a specific embodiment of the utility model, Figure 1 The upper and lower surfaces of the inner mold 201 and the outer mold 101 are both on the same plane. The mold as a whole is on the same plane, and it is stable when the mold is used and is not easy to be skewed. During operation, when the inner mold 201 is fixed, the upper mold punch 202 and the lower mold pad 203 are squeezed at the inner mold hole to generate pressure to shape the product and press the required ceramic powder into the required product, while the outer mold 101 is fixed on the basis of the inner mold 201 being fixed, and the inner mold 201 is wrapped by two semi-circular rings for secondary fixation. By using the two half outer modules of the outer mold to wrap the inner mold 201 divided into three inner modules, and cross-fixing the flange surfaces on both sides of the outer module with bolts, the fixing effect of the inner mold 201 is strengthened, which can make the mold more stable during use. By making the upper and lower surfaces of the inner mold 201 and the outer mold 101 on the same plane, the fixing operation of the outer mold and the inner mold can be completed on the same horizontal plane during operation. The same level can ensure that the mold can be operated more stably after being fixed, and ensure that the powder tableting quality can meet the standards during the rapid molding process.

[0041] In a specific embodiment of the utility model, Figure 1 The outer mold 101 shown is a circular ring divided into two equal parts, and its inner hole is tightly matched with the outer wall of the inner mold 201, and its height is consistent with the height of the inner mold 201. A flange surface is opened on the outer wall of the outer mold 101, and the width of the flange surface ensures that the hexagonal nut has enough working space. The outer mold divided into two equal parts has four symmetrical bolt holes opened on the flange surface, and the hexagonal bolts are used to tightly connect the two halves of the outer mold together through the bolt holes. Strengthen the stability of the outer mold fixation and facilitate disassembly. Install the bolts at the flange of the outer mold, and tighten the nuts in a cross order to finally ensure that the two halves of the outer mold fit tightly without gaps.

[0042] In a specific embodiment of the utility model, Figure 3 The cross section of the inner module is fan-shaped. The fan-shaped inner module can directly form the inner mold 201 to form a circular ring structure, which fits perfectly. In addition, the fan-shaped inner module has a small inner diameter and a large outer diameter, so the inner module can be taken out in blocks conveniently and labor-savingly to avoid excessive force to damage the product.

[0043] In a specific embodiment of the utility model, the working pressure of the mold during forward pressing reaches 8-18MPa. Appropriate working pressure can quickly and effectively press the powder into the required product. When the pressure reaches 8-18MPa during use, stop pressurizing, and maintain the pressure for 3-7min under this pressure. After the pressure maintenance is completed, continue to tighten the outer mold nut, and the tightening sequence is carried out in a cross order. This process is the first stage process of powder pressing, that is, forward pressing, and 8-18MPa is the working pressure of forward pressing. Remove the pressure, turn the mold as a whole, make the upper die punch 202 contact the workbench, and ensure that the mold as a whole does not fall over. Shake the manual tablet press handle up and down to slowly increase the pressure, but ensure that the pressure is lower than the forward pressing pressure (3-6MPa), stop pressurizing, and maintain the pressure for 4-9min. This process is the second stage process of powder pressing, that is, reverse pressing. Reduce the tablet press pressure to 0.5-2MPa. Then remove the fixed inner and outer molds on the outside to obtain the required tablet product.

[0044] From the above embodiments, it can be seen that the advantages of the utility model are: by using the detachable inner and outer molds 101, both of which are composed of the same small modules, the positioning structure of the inner film is used to facilitate installation and positioning, so that the equipment can be more tightly fitted. The problems of complicated technology and high production costs in the background technology scheme are improved, and a simple and easy-to-process mold is improved to match the corresponding pressing method, so as to achieve the innovative purpose of achieving the quality of powder tableting while quickly pressing and forming.

Claims

1. A mold for ceramic powder compression molding, characterized in that: The mold comprises an inner mold (201) and an outer mold (101); The outer mold (101) is divided into two outer mold sections, which are fixed to the outer side of the inner mold (201) by bolts (102); The inner mold (201) is composed of a plurality of identical inner mold blocks, and a lower mold pad (203) and an upper mold punch (202) are inserted into the central hole of the inner mold (201).

2. A ceramic powder compression mold according to claim 1, characterized in that: The lower die pad (203) is a stepped cylinder, and the lower die pad (203) is composed of two cylinders, an upper cylinder and an lower cylinder, wherein the diameter of the lower cylinder is greater than the diameter of the upper cylinder; The upper bottom surface of the lower cylinder of the lower mold pad (203) is flush with the bottom surface of the inner mold (201).

3. The ceramic powder compression mold according to claim 1, characterized in that: The bottom of the inner mold (201) is provided with a positioning structure (204) distributed on the joint surface of the two inner mold sections.

4. A ceramic powder compression mold according to claim 1 or 3, characterized in that: The upper and lower surfaces of the inner mold (201) and the outer mold (101) are both on the same plane.

5. The ceramic powder compression mold according to claim 1, characterized in that: The upper punch (202) contained in the inner die (201) is a stepped cylindrical shape, and the diameter of the small cylinder in the upper half of the upper punch differs from the diameter of the large cylinder in the lower half by 0.5 mm to 10 mm.

6. The ceramic powder compression mold according to claim 1, characterized in that: The cross-sections of the two identical outer modules of the outer mold (101) are semicircular, with flange surfaces on both sides, and are symmetrically fixed by the bolts (102).

7. A ceramic powder compression mold according to claim 1 or 3, characterized in that: The cross section of the inner module is fan-shaped.

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