A mold and method for making a frit crucible

Abstract

The present application relates to a kind of preparation of melt crucible mould and method, mould includes matched shaping mould and forming mould;Shaping mould has with the outer contour of the inner cavity of the melt crucible to be prepared matching;Forming mould includes bottom plate, and the bottom of shaping mould corresponds;Rotatably connected with side pressing plate in the periphery of bottom plate;When shaping mould is placed on bottom plate, all side pressing plate can be rotated to with the side surface of shaping mould corresponding side fit;The lower surface of bottom plate and all side pressing plate is equipped with heating unit respectively.The present application can guarantee that tungsten skin can be uniformly heated to appropriate bending temperature, ensure that tungsten skin can have stronger toughness, and also can not be seriously oxidized because of temperature is too high, and the whole process is simple to operate, once forming in place, high efficiency.

Description

Technical Field

[0001] This invention belongs to the field of crystal growth equipment manufacturing technology, specifically relating to a mold and method for preparing a molten crucible. Background Technology

[0002] In the process of horizontally oriented growth of slab-shaped crystals, since the volume of the crystal raw material in its initial state (powder or block) and after melting and recrystallization differs greatly, in order to improve the crystal growth efficiency and the final crystal size, two types of crucibles are usually used: one is a crystal melting crucible, and the other is a crystal growth crucible.

[0003] First, the crystal powder is placed in a molten crucible and melted at high temperature before recrystallizing into a polycrystalline material. The resulting polycrystalline material is reduced to less than half its original volume. Then, the polycrystalline material is removed from the molten crucible and placed in a crystal growth crucible. The gaps in the polycrystalline material are filled with powder, and it is placed back into the crystal growth furnace for crystal introduction and growth, ultimately obtaining a crystal of the desired size. Typically, the polycrystalline material obtained from the two melting processes can be used for one crystal growth cycle.

[0004] The molten crucibles used in the above process are generally formed by bending tungsten slabs. If prepared at room temperature, cracks or even complete breakage of the tungsten slab at the bend are likely to occur, making such crucibles unsuitable for molten materials. However, tungsten slabs become less brittle and more ductile at around 300°C. Therefore, heating them to a certain temperature before bending effectively solves the cracking problem. However, uneven heating can still cause localized cracking of the tungsten slab; overheating can lead to severe oxidation of the tungsten in the air. Therefore, the tungsten slab must be bent at a suitable temperature to produce a qualified molten crucible. Summary of the Invention

[0005] To address the aforementioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a mold and method for preparing a molten crucible, thereby avoiding the problem of tungsten skin cracking due to unsuitable preparation temperature when making a molten crucible with tungsten skin, and achieving the effect of uniformly heating the tungsten skin and bending it at an ideal heating temperature.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A mold for preparing a molten crucible includes a set-forming mold and a forming mold. The set-forming mold has an outer contour that matches the inner cavity of the molten crucible to be prepared. The forming mold includes a base plate, the bottom shape of which corresponds to that of the set-forming mold. Side pressure plates are rotatably connected around the base plate. When the set-forming mold is placed on the base plate, all the side pressure plates can be rotated to fit against the corresponding side of the set-forming mold. Heating units are respectively provided on the lower surfaces of the base plate and all the side pressure plates.

[0007] To further improve the above technical solution, the heating unit is an electric heating plate or an electric heating wire, which is fixedly installed on the lower surface of the base plate and all side pressure plates.

[0008] Furthermore, temperature sensing elements are provided on the lower surfaces of the base plate and all side pressure plates to detect the temperature of the base plate and side pressure plates.

[0009] Furthermore, it also includes push rods corresponding to the side pressure plates one by one. One end of the push rod is connected to the drive mechanism, and the other end abuts against the middle of the side pressure plate on which the heating unit is installed, so as to push the side pressure plate to rotate around the base plate under the drive of the drive mechanism; the temperature measuring element and the control unit are connected, and the control unit is connected to all drive mechanisms, so as to control the corresponding drive mechanism to drive the push rod to move according to the temperature information detected by the temperature measuring element.

[0010] Furthermore, the driving mechanism is a motor.

[0011] Furthermore, the shaping mold, the base plate, and each side pressure plate are made of heat-resistant metal materials.

[0012] This invention also relates to a method for preparing a molten crucible. This method is based on a mold for preparing a molten crucible as described above, and specifically includes the following steps: S1. Place the base plate on the worktable, and open the side pressure plates horizontally on the worktable; then place the tungsten skin, the raw material for preparing the molten crucible, in the center on the base plate, and then place the shaping mold in the center on the tungsten skin, while keeping it in the center relative to the base plate. Apply a force from top to bottom on the shaping mold to prevent it from moving horizontally. S2. Start the heating unit. The heating unit generates heat and transfers the heat to the tungsten skin through the bottom plate and each side pressure plate. When the temperature sensing element detects that the temperature has risen to the set temperature, the heating stops and the temperature is maintained. The drive mechanism drives the push rod to rotate the corresponding side pressure plate upward around the bottom plate and pushes the tungsten skin in the corresponding area to bend synchronously until it is in close contact with the outer surface of the shaping mold. The tungsten skin in close contact with the outer surface of the shaping mold and the tungsten skin in the corresponding area of ​​the bottom plate form a container structure. The tungsten skin in the other four areas that do not directly contact the bottom plate and the side pressure plate are folded in half under the action of the side pressure plate to form the four ears at the four corners of the container structure. S3. Turn off the heating unit, rotate each side pressure plate to the horizontal direction, take out the shaping mold, and the tungsten skin is thus prepared into a molten crucible.

[0013] Furthermore, the tungsten skin is held in place for a set time after forming the container structure.

[0014] Furthermore, the drive mechanism is located below the worktable, and a through hole is provided on the worktable for the push rod to extend out. The push rod passes through the through hole and acts on the corresponding side pressure plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A mold for preparing a molten crucible according to the present invention is configured such that the forming mold is rotatably connected to a base plate with four side pressure plates, and heating units are provided on the lower surface of the base plate and the outer surface of each side pressure plate. Heat can be transferred to the tungsten skin through the forming mold, so that the tungsten skin can be bent and formed at a suitable bending temperature to obtain a molten crucible with accurate shape and no cracks at the bending point.

[0016] 2. This invention provides a method for preparing a molten crucible. Based on a mold for preparing the molten crucible, the base plate and side pressure plates clamp and fix the tungsten sheet. A heating unit heats the tungsten sheet uniformly to a suitable bending temperature, ensuring that the tungsten sheet possesses strong toughness without being severely oxidized due to excessive temperature. The entire process is simple, achieving one-time molding with high efficiency. Since this invention prepares a molten crucible, which only requires molten material and functions as a container, the molding requirements are not high. The molten crucible prepared by this invention fully meets the usage requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the initial state of the preparation of the molten crucible of the present invention; Figure 2 This is a schematic diagram showing the shaping mold descending to its position on the tungsten skin and remaining stationary during the preparation of the molten crucible of the present invention; Figure 3 This is a schematic diagram of an intermediate state during the process of the side pressure plate pushing the tungsten skin to form during the preparation of the molten crucible of the present invention; Figure 4 This is a schematic diagram showing the side pressure plate being pushed into place during the preparation of the molten crucible of the present invention.

[0018] Figure 5 This is a diagram showing the relationship between the molten crucible and the shaping mold in the forming state according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the molten crucible prepared in the example; The components include: a shaping mold 1, a base plate 21, a side pressure plate 22, an electric heating wire 3, a thermocouple 4, a tungsten shell 5, a push rod 61, a drive mechanism 62, a worktable 7, and a shaping mold drive mechanism 8. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Please see Figures 1-4A specific embodiment of a mold for preparing a molten crucible includes a matching shaping mold 1 and a forming mold. The shaping mold 1 has an outer contour that matches the inner cavity of the molten crucible to be prepared. The forming mold includes a base plate 21, and the bottom shape of the base plate 21 corresponds to that of the shaping mold 1. Side pressure plates 22 are rotatably connected around the base plate 21. When the shaping mold 1 is placed on the base plate 21, all the side pressure plates 22 can be rotated to fit against the corresponding side of the shaping mold 1. Heating units are respectively provided on the lower surfaces of the base plate 21 and all the side pressure plates 22.

[0023] One embodiment of the mold for preparing a molten crucible is to set the forming mold in a structure in which the base plate 21 is rotatably connected to four side pressure plates 22, and to set heating units on the lower surface of the base plate 21 and each side pressure plate 22, so that heat can be transferred to the tungsten skin 5 through the forming mold, so that the tungsten skin 5 can be bent and formed at a suitable bending temperature, so as to obtain a molten crucible with accurate shape and no cracks at the bending point.

[0024] The heating unit is an electric heating plate or an electric heating wire 3, which is fixedly installed on the lower surface of the base plate 21 and all the side pressure plates 22. Figures 1-4 The image shows electric heating wire 3.

[0025] Temperature sensing elements are provided on the lower surfaces of the base plate 21 and all the side pressure plates 22 to detect the temperature of the base plate 21 and the side pressure plates 22.

[0026] In this way, the temperature of the base plate 21 and each side pressure plate 22 can be measured in real time, which facilitates the control of the heating unit to rise to the ideal bending temperature of the tungsten sheet 5. In this embodiment, the temperature measuring element is a thermocouple 4, which is set in the middle of the lower surface of the base plate 21 and the side pressure plate 22 for temperature measurement.

[0027] It also includes push rods 61 that correspond one-to-one with the side pressure plates 22. One end of the push rod 61 is connected to the drive mechanism 62, and the other end abuts against the middle of the side of the corresponding side pressure plate 22 on which the heating unit is installed, so as to push the side pressure plate 22 to rotate around the base plate 21 under the drive of the drive mechanism 62. The temperature measuring element and the control unit (not shown in the figure) are connected. The control unit is connected to all the drive mechanisms 62 so as to control the corresponding drive mechanism 62 to drive the push rod 61 to move according to the temperature information detected by the temperature measuring element.

[0028] In this way, the push rod 61 is driven by the drive mechanism 62 to rotate each side pressure plate 22 to fit with the corresponding side of the forming mold 1, thereby realizing the bending and forming of the tungsten skin 5.

[0029] During implementation, since each side pressure plate 22 rotates, the movement trajectory of the push rod 61 is not linear. To ensure that the push rod 61 can effectively push the side pressure plate 22 to rotate and fit with the shaping mold, a groove can be provided in the middle of the side pressure plate 22. The length direction of the groove is consistent with the width direction of the side pressure plate 22 (when laid flat). Alternatively, the push rod 61 can be designed as a robotic arm. The angle of the robotic arm can be adjusted to ensure that the free end of the push rod 61 is always in contact with the side pressure plate 22 when the side pressure plate 22 rotates, thereby achieving effective pushing of the side pressure plate 22. At the same time, the push rod 61 should be a structure with a variable length to ensure that its free end is always in contact with the side pressure plate 22.

[0030] Of course, in addition to setting push rod 61 to control the rotation of each side pressure plate 22, each side pressure plate 22 can also be rotatably connected to the bottom plate 21 through a hinge, and then a handle is set on the hinge to control the rotation. At the same time, a positioning component is set. When the side pressure plate 22 rotates to the position, it is positioned, and finally the tungsten skin 5 is bent into a molten crucible.

[0031] In practice, the drive mechanism 62 is a motor.

[0032] The shaping mold 1, the base plate 21, and each side pressure plate 22 are made of heat-resistant metal material.

[0033] In practice, the base plate 21 and each side pressure plate 22 are all made of steel plates.

[0034] Please see Figures 1-6 The present invention also provides a method for preparing a molten crucible. This method is based on a mold for preparing a molten crucible as described above, and specifically includes the following steps: S1. Place the base plate 21 on the workbench 7, with each side pressure plate 22 horizontally opened and positioned on the workbench 7; then, place the tungsten sheet 5, the raw material for preparing the molten crucible, centered on the base plate 21, and then place the shaping mold 1 centered on the tungsten sheet 5, simultaneously centered relative to the base plate 21, applying a downward force to the shaping mold 1 to prevent it from moving horizontally; Figure 1 and Figure 2 As shown; S2. Start the heating unit. The heating unit generates heat and transfers the heat to the tungsten skin 5 through the base plate 21 and each side pressure plate 22. When the temperature sensing element detects that the temperature has risen to the set temperature (the ideal bending temperature of the tungsten skin 5, usually around 300°C), the heating is stopped and the temperature is maintained. The drive mechanism 62 drives the push rod 61 to move, pushing the corresponding side pressure plate 22 to rotate upward around the base plate 21, and pushing the corresponding area of ​​the tungsten skin 5 to bend synchronously until it is in close contact with the outer surface of the shaping mold 1. The tungsten skin 5 in close contact with the outer surface of the shaping mold 1 and the tungsten skin 5 in the corresponding area of ​​the base plate 21 together form a container structure. The tungsten skin 5 in the other four areas that do not directly contact the base plate 21 and the side pressure plate 22 are each folded in half under the action of the side pressure plate 22 to form the four ears at the four corners of the container structure. Figure 3 This is a schematic diagram of a certain moment during the process of the side pressure plate 22 pushing the tungsten skin 5 to form (in actual manufacturing, the tungsten skin 5 should be in contact with the side pressure plate 22; this is for ease of illustration). Figure 3 (The tungsten skin 5 and the side pressure plate 22 are separate). Figure 4 This is a schematic diagram showing the side pressure plate 22 being pushed into place.

[0035] S3. Turn off the heating unit, rotate each side pressure plate 22 to the horizontal direction, take out the shaping mold 1, and the tungsten skin 5 to prepare the molten crucible.

[0036] An embodiment of a method for preparing a molten crucible, based on a mold for preparing a molten crucible, wherein a base plate 21 and side pressure plates 22 can clamp and fix the tungsten sheet 5, and a heating unit heats the tungsten sheet 5 so that it can be uniformly heated to a suitable bending temperature, ensuring that the tungsten sheet 55 has both strong toughness and will not be severely oxidized due to excessive temperature, ultimately obtaining a molten crucible as described above. Figure 6 The molten material crucible shown is used throughout the process, which is simple to operate, achieves complete molding in one go, and is highly efficient.

[0037] When implementing, such as Figure 1 and Figure 2 As shown, a shaping mold drive mechanism 8 is connected above the shaping mold 1. The shaping mold 1 is driven to move downward by the shaping mold drive mechanism 8 so that the shaping mold 1 is centered and pressed down on the tungsten skin 5. The shaping mold drive mechanism 8 applies a force to the shaping mold 1 to prevent the shaping mold 1 from moving horizontally.

[0038] It is understood that the present invention prepares a molten material crucible, which only needs to contain molten material and has the function of a container. Therefore, the requirements for its forming are not high, and the molten material crucible prepared by the present invention fully meets the usage requirements. Furthermore, in the present invention, the sides of the shaping mold 1 are connected by rounded corners to prevent the right-angled side edges and bottom edges from affecting the bending and forming of the tungsten sheet 5 at high temperatures. Although the present invention does not have high requirements for the final forming of the crucible, the unevenness of the crucible wall thickness caused during the bending process should be minimized.

[0039] Among them, the tungsten skin 5 is held for a set time after forming the container structure.

[0040] This ensures better forming effect of the molten crucible; in practice, the set time is generally sufficient to reduce the overall temperature of the molten crucible to below 100°C.

[0041] In the actual design, a boss protrudes from the center of the worktable, the base plate is placed on the boss, and the side pressure plates 22 are horizontally opened and located on the four sides of the boss, suspended from the worktable; the drive mechanism is located on the worktable around the boss. In this way, each push rod 61 and the drive mechanism 62 can be installed on the worktable 7.

[0042] Alternatively, the workbench can be entirely flat, with the drive mechanism 62 located below the workbench 7. The workbench 7 has a through hole for the push rod 61 to extend through, and the push rod 61 passes through the through hole to act on the corresponding side pressure plate 22. The drive mechanism 62 is located below the workbench and can be further enclosed by a partition. This avoids the safety hazards to the surrounding environment and personnel caused by the exposed drive mechanism and also helps to protect the drive mechanism.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A mold for preparing a molten crucible, characterized in that: It includes a matching shaping mold and a forming mold; the shaping mold has an outer contour that matches the inner cavity of the crucible to be molten; the forming mold includes a base plate, the bottom shape of which corresponds to that of the shaping mold; side pressure plates are rotatably connected around the base plate; when the shaping mold is placed on the base plate, all the side pressure plates can be rotated to fit against the corresponding side of the shaping mold. Heating units are provided on the lower surfaces of the base plate and all side pressure plates; Temperature sensing elements are provided on the lower surfaces of the base plate and all side pressure plates to detect the temperature of the base plate and side pressure plates. It also includes push rods that correspond one-to-one with the side pressure plates. One end of the push rod is connected to the drive mechanism, and the other end abuts against the middle of the side pressure plate on which the heating unit is installed, so as to push the side pressure plate to rotate around the base plate under the drive of the drive mechanism; the temperature measuring element and the control unit are connected, and the control unit is connected to all drive mechanisms to control the corresponding drive mechanism to drive the push rod to move according to the temperature information detected by the temperature measuring element. The sides of the shaping mold are connected by rounded corners to prevent the right-angled side edges and bottom edges from affecting the bending and forming of the tungsten skin under high temperature.

2. The mold for preparing a molten crucible according to claim 1, characterized in that: The heating unit is an electric heating plate or an electric heating wire, which is fixedly installed on the lower surface of the base plate and all side pressure plates.

3. The mold for preparing a molten crucible according to claim 1, characterized in that: The driving mechanism is a motor.

4. The mold for preparing a molten crucible according to claim 1, characterized in that: The shaping mold, base plate, and side pressure plates are made of heat-resistant metal materials.

5. A method for preparing a molten crucible, characterized in that: This preparation method is based on the mold for preparing a molten crucible as described in claim 1, and specifically includes the following steps: S1. Place the base plate on the worktable, and open the side pressure plates horizontally on the worktable; then place the tungsten skin, the raw material for preparing the molten crucible, in the center on the base plate, and then place the shaping mold in the center on the tungsten skin, while keeping it in the center relative to the base plate. Apply a force from top to bottom on the shaping mold to prevent it from moving horizontally. S2. Start the heating unit. The heating unit generates heat and transfers the heat to the tungsten skin through the bottom plate and each side pressure plate. When the temperature sensing element detects that the temperature has risen to the set temperature, the heating stops and the temperature is maintained. The drive mechanism drives the push rod to rotate the corresponding side pressure plate upward around the bottom plate and pushes the tungsten skin in the corresponding area to bend synchronously until it is in close contact with the outer surface of the shaping mold. The tungsten skin in close contact with the outer surface of the shaping mold and the tungsten skin in the corresponding area of ​​the bottom plate form a container structure. The tungsten skin in the other four areas that do not directly contact the bottom plate and the side pressure plate are folded in half under the action of the side pressure plate to form the four ears at the four corners of the container structure. S3. Turn off the heating unit, rotate each side pressure plate to the horizontal direction, take out the shaping mold, and the tungsten skin is thus prepared into a molten crucible.

6. The method for preparing a molten crucible according to claim 5, characterized in that: The tungsten foil is held in place for a set time after forming the container structure.

7. The method for preparing a molten crucible according to claim 5, characterized in that: The drive mechanism is located below the worktable, and the worktable has a through hole for the push rod to extend out. The push rod passes through the through hole and acts on the corresponding side pressure plate.

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