Pre-pressing mold for sintering luminescent ceramics

Abstract

The utility model discloses a pre-pressing die for sintering luminescent ceramics. The pre-pressing die comprises a die cavity cylinder, a bottom pressing plunger and a top pressing plunger, a first positioning convex block and a second positioning convex block are arranged at the end part of the mold cavity cylinder; the bottom pressing plunger comprises a bottom column body and a bottom end flange, the top pressing plunger comprises a top column body and a top end flange, and the bottom column body and the top column body are matched to be used for pre-pressing and compacting powder materials in a cavity of the mold cavity barrel. According to the pre-pressing mold, the pre-pressing mold is pre-pressed and compacted through a hydraulic machine, then after the top pressing plunger is removed, accurate positioning and butt joint of the mold cavity of the pre-pressing mold and the mold cavity of the graphite mold are achieved through the action of the first positioning protruding block and the second positioning protruding block, torsion or deviation is avoided, and a sintered body with the very high cleanliness can be obtained after operation is conducted; compaction and sintering are separately performed by two devices, and graphite paper does not need to be added into a sintering mold, so that the problem of impurity pollution caused by the sintering mold can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a pre-pressing mold for sintering luminescent ceramics. Background Art

[0002] Luminescent ceramics are a product obtained by melting luminescent pigments into traditional ceramic glazes and firing them at high temperatures. They can absorb a variety of natural light (sunlight / other scattered light) and activate the absorbed light energy, and will automatically glow when placed in a dark environment.

[0003] The preparation methods of luminescent ceramics include impregnation sintering, hot pressing sintering, and discharge plasma sintering. Among them, after the luminescent material is evenly mixed with the ceramic raw material, hot pressing sintering or plasma sintering technology is used, which is the most widely used firing molding method. The existing practice is to put the mixed powder material into a graphite mold wrapped with graphite paper, use a graphite press to compact the powder, and then pressurize and sinter. Since this operation method is to compact and sinter the powder in the same mold, it is necessary to equip it with graphite paper to improve the detachment of the powder after sintering. However, such an operation can easily mix graphite paper scraps, dust, etc. into the powder, forming a more serious impurity pollution, which significantly affects the photoelectric effect and stability of the ceramic. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a pre-pressing mold for sintering luminescent ceramics to solve the above-mentioned traditional problems.

[0005] The utility model is implemented by the following technical solutions:

[0006] A pre-pressing mold for sintering luminescent ceramics, comprising a mold cavity tube with a cavity, a bottom pressure plunger and a top pressure plunger; a first positioning protrusion and a second positioning protrusion are provided at the end of the mold cavity tube, the first positioning protrusion cooperates with the second positioning protrusion to be used for positioning with the positioning groove at the end of the graphite mold; the bottom pressure plunger comprises a bottom cylinder and a bottom end flange, the bottom cylinder is used to be plugged in the cavity of the mold cavity tube; the top pressure plunger comprises a top cylinder and a top end flange, the top cylinder is used to be plugged in the cavity of the mold cavity tube; the bottom cylinder cooperates with the top cylinder to pre-press and compact the powder material in the cavity of the mold cavity tube.

[0007] Preferably, the mold cavity is a cylindrical body, and the first positioning protrusion and the second positioning protrusion are respectively arranged at opposite ends of the mold cavity.

[0008] Preferably, the first positioning protrusion is a rectangular parallelepiped structure arranged horizontally, and the second positioning protrusion is a rectangular parallelepiped structure arranged vertically.

[0009] Preferably, the bottom end flange is a regular tetrahedron or a hexagonal cube; the top end flange is a regular tetrahedron or a hexagonal cube.

[0010] Preferably, the wall thickness of the mold cavity is 15 mm to 20 mm, and the matching tolerance between the inner diameter of the mold cavity and the inner diameter of the graphite sintering mold is -0.05 mm to -0.1 mm.

[0011] Preferably, the matching tolerance between the bottom cylinder and the cavity of the mold cavity is -0.08 mm to -0.12 mm, and the surface roughness of the inner wall of the cavity of the mold cavity and the outer wall of the bottom cylinder is less than 0.03 μm.

[0012] Preferably, the bottom cylinder is a right circular cylinder, and the length of the bottom cylinder exceeds the height of the cavity of the mold cavity by 1 mm to 2 mm.

[0013] Preferably, the fitting tolerance between the top column and the cavity of the mold cavity is -0.08 mm to -0.12 mm, and the surface roughness of the inner wall of the cavity of the mold cavity and the outer wall of the top column is less than 0.03 μm.

[0014] Preferably, the top column is a right circular cylinder, and the length of the top column exceeds the height of the cavity of the mold cavity by 1 mm to 2 mm.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model discloses a pre-pressing mold for sintering luminescent ceramics. The bottom pressure plunger is first inserted into the bottom of the mold cavity, and then the powder material is filled into the mold cavity. The top pressure plunger is used to pre-press and compact the material using a hydraulic press. After the top pressure plunger is removed, the first positioning protrusion and the second positioning protrusion are used to achieve precise positioning and docking between the cavity of the pre-pressing mold and the cavity of the graphite mold without twisting or offset. The compacted cylindrical block in the pre-pressing mold is transferred to the graphite mold cavity, and finally the graphite mold with the compacted cylindrical block is sintered. After such operation, a sintered body with very high cleanliness can be obtained. Since compaction and sintering are performed by two separate devices, there is no need to add graphite paper in the sintering mold, which can effectively avoid the problem of impurity pollution caused by the sintering mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a pre-pressing mold for sintering luminescent ceramics of the utility model;

[0018] Figure 2 for Figure 1 A top view of the mold cavity shown;

[0019] Figure 3 for Figure 1 A top view of the bottom pressure plunger is shown, wherein the flange of the bottom pressure plunger is a regular cube;

[0020] Figure 4 for Figure 1 A top view of a bottom pressure plunger is shown, wherein the flange of the bottom pressure plunger is a hexagon.

[0021] In the figure: 10, mold cavity; 11, first positioning protrusion; 12, second positioning protrusion; 20, bottom pressure plunger; 30, top pressure plunger. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0023] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the description of the present utility model, it is necessary to understand that when an element is considered to be "connected" to another element, it may be directly connected to another element or there may be intermediate elements at the same time. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0025] See also Figure 1-Figure 4, which is a pre-pressing mold for sintering luminescent ceramics of a preferred embodiment of the utility model, is used to cooperate with a graphite mold to carry out the preliminary powder compaction work, and then move the compacted powder to the graphite mold for subsequent sintering work. Specifically, the pre-pressing mold for sintering luminescent ceramics includes a mold cavity tube 10 with a cavity, a bottom pressure plunger 20 and a top pressure plunger 30; the end of the mold cavity tube 10 is provided with a first positioning protrusion 11 and a second positioning protrusion 12, the first positioning protrusion 11 cooperates with the second positioning protrusion 12 to be used for positioning with the positioning groove (not shown) at the end of the graphite mold; the bottom pressure plunger 20 includes a bottom cylinder and a bottom end flange, and the bottom cylinder is used to be plugged in the cavity of the mold cavity tube 10; the top pressure plunger 30 includes a top cylinder and a top end flange, and the top cylinder is used to be plugged in the cavity of the mold cavity tube 10; the bottom cylinder and the top cylinder cooperate to pre-press and compact the powder material in the cavity of the mold cavity tube 10.

[0026] The above-mentioned pre-pressing mold for sintering luminescent ceramics is coordinated with the mold cavity 10, the bottom pressure plunger 20 and the top pressure plunger 30. The bottom pressure plunger 20 is first inserted at the bottom of the mold cavity 10, and then the powder material is filled into the mold cavity 10, and then the top pressure plunger 30 is used to pre-press it tightly using a hydraulic press. Then, after the top pressure plunger 30 is removed, the first positioning protrusion 11 and the second positioning protrusion 12 are used to achieve precise positioning and docking of the mold cavity of the pre-pressing mold and the mold cavity of the graphite mold without twisting or offset. The compacted cylindrical block in the pre-pressing mold is transferred to the graphite mold cavity, and finally the graphite mold with the compacted cylindrical block is sintered. After such operation, a sintered body with high cleanliness can be obtained. Since the compaction and sintering are performed by two separate devices, there is no need to add graphite paper in the sintering mold, which can effectively avoid the impurity pollution problem caused by the sintering mold.

[0027] In the present embodiment, the mold cavity 10 is a cylindrical body, and the first positioning protrusion 11 and the second positioning protrusion 12 are respectively arranged at opposite ends of the mold cavity 10. Specifically, the first positioning protrusion 11 is a rectangular parallelepiped structure arranged horizontally, and the second positioning protrusion 12 is a rectangular parallelepiped structure arranged vertically. By providing the first positioning protrusion 11 and the second positioning protrusion 12 arranged horizontally and vertically at the end of the mold cavity 10, corresponding to the positioning groove at the end of the graphite mold, the pre-pressing mold cavity and the graphite mold cavity are accurately positioned and docked without twisting or offset. In other embodiments, the first positioning protrusion 11 and the second positioning protrusion 12 can be arranged at the top and / or bottom of the mold cavity 10.

[0028] In one embodiment, the wall thickness of the mold cavity 10 is 15 mm to 20 mm, and the matching tolerance between the inner diameter of the mold cavity 10 and the inner diameter of the graphite sintering mold is -0.05 mm to -0.1 mm.

[0029] Optionally, the flange at the bottom end is a regular square or hexagonal, which is convenient for rotating the pressure plunger after pre-pressing, and at the same time limiting to prevent the pre-pressed ceramic block from continuing to be pressed after entering the graphite mold cavity from the pre-pressing mold cavity and causing damage; the matching tolerance of the bottom cylinder and the cavity of the mold cavity tube 10 is -0.08mm to -0.12mm, and the surface roughness of the inner wall of the cavity of the mold cavity tube 10 and the outer wall of the bottom cylinder is less than 0.03μm. The bottom cylinder is a right circular cylinder, and the length of the bottom cylinder exceeds the height of the cavity of the mold cavity tube 10 by 1mm to 2mm. Similarly, the top flange is a regular square or hexagonal body, which is convenient for rotating the pressure plunger after pre-pressing, and at the same time, it is limited to prevent the pre-pressed ceramic block from continuing to be pressed after entering the graphite mold cavity from the pre-pressing mold cavity and causing damage; the matching tolerance between the top column and the cavity of the mold cavity tube 10 is -0.08mm to -0.12mm, and the surface roughness of the inner wall of the cavity of the mold cavity tube 10 and the outer wall of the top column is less than 0.03μm. The top column is a right circular cylinder, and the length of the top column exceeds the height of the cavity of the mold cavity tube 10 by 1mm to 2mm.

[0030] In the above embodiments, the mold material of the mold cavity 10, the bottom pressure plunger 20 and the top pressure plunger 30 is selected from high-quality cold-working mold steel.

[0031] During operation, the bottom pressure plunger 20 is inserted at the bottom of the mold cavity 10, and then the evenly mixed powder material is filled into the cavity of the mold cavity 10, and then the top pressure plunger 30 is inserted at the top of the mold cavity 10, and the powder material is pre-pressed and compacted by a hydraulic press. After compaction, the bottom pressure plunger 20 (or the top pressure plunger 30) is rotated and removed, and the pre-pressing mold and the sintering graphite mold are combined through a positioning device, and the compacted cylindrical block is squeezed out by a manual hydraulic press, and accurately inserted into the graphite mold for sintering, so that a sintered body with high cleanliness can be obtained, effectively avoiding the problem of impurity pollution caused by the sintering mold.

[0032] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A pre-pressing mold for sintering luminescent ceramics, characterized in that: It includes a mold cavity tube with a cavity, a bottom pressure plunger and a top pressure plunger; the end of the mold cavity tube is provided with a first positioning protrusion and a second positioning protrusion, the first positioning protrusion cooperates with the second positioning protrusion to be used for positioning with the positioning groove at the end of the graphite mold; the bottom pressure plunger includes a bottom cylinder and a bottom end flange, the bottom cylinder is used to be plugged in the cavity of the mold cavity tube; the top pressure plunger includes a top cylinder and a top end flange, the top cylinder is used to be plugged in the cavity of the mold cavity tube; the bottom cylinder and the top cylinder cooperate to pre-compact the powder material in the cavity of the mold cavity tube.

2. The pre-pressing mold for sintering luminescent ceramics according to claim 1, characterized in that: The mold cavity is a cylindrical body, and the first positioning protrusion and the second positioning protrusion are respectively arranged at two opposite ends of the mold cavity.

3. The pre-pressing mold for sintering luminescent ceramics according to claim 2, characterized in that: The first positioning protrusion is a rectangular parallelepiped structure arranged horizontally, and the second positioning protrusion is a rectangular parallelepiped structure arranged vertically.

4. The pre-pressing mold for sintering luminescent ceramics according to claim 1, characterized in that: The bottom end flange is a regular tetrahedron or a hexagonal cube; the top end flange is a regular tetrahedron or a hexagonal cube.

5. The pre-pressing mold for sintering luminescent ceramics according to claim 1, characterized in that: The wall thickness of the mold cavity is 15 mm to 20 mm, and the matching tolerance between the inner diameter of the mold cavity and the inner diameter of the graphite sintering mold is -0.05 mm to -0.1 mm.

6. The pre-pressing mold for sintering luminescent ceramics according to claim 1, characterized in that: The matching tolerance between the bottom cylinder and the cavity of the mold cavity is -0.08mm to -0.12mm, and the surface roughness of the inner wall of the cavity of the mold cavity and the outer wall of the bottom cylinder is less than 0.03μm.

7. The pre-pressing mold for sintering luminescent ceramics according to claim 6, characterized in that: The bottom cylinder is a right circular cylinder, and the length of the bottom cylinder exceeds the height of the cavity of the mold cavity by 1 mm to 2 mm.

8. The pre-pressing mold for sintering luminescent ceramics according to claim 1, characterized in that: The matching tolerance between the top column and the cavity of the mold cavity is -0.08mm to -0.12mm, and the surface roughness of the inner wall of the cavity of the mold cavity and the outer wall of the top column is less than 0.03μm.

9. The pre-pressing mold for sintering luminescent ceramics according to claim 8, characterized in that: The top column is a right circular cylinder, and the length of the top column exceeds the height of the cavity of the mold cavity by 1 mm to 2 mm.

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