A pouring mold device for producing quartz crucibles

Abstract

The present invention relates to the technical field of quartz crucibles, and specifically to an injection molding device for the production of quartz crucibles, including: a working base frame, an injection driving assembly, an injection core barrel, a hot pressing die sleeve, and a forming die. An adjusting slide seat for adjusting the height of the injection driving assembly is slidably installed on the surface of the working base frame. The injection driving assembly is fixedly installed on the surface of the working base frame. The hot pressing die sleeve is slidably sleeved outside the injection core barrel. The forming die is of a two-piece structure and has a cavity formed inside. The forming die is sleeved outside the hot pressing die sleeve. In the present invention, by providing a sealing structure and a positioning structure between the injection core barrel and the hot pressing die sleeve, the coaxial alignment of the two during the injection molding process is ensured, effectively avoiding molding defects caused by offset or uneven injection, ensuring the uniform filling of the molten quartz liquid, and improving the uniformity of the crucible wall thickness and the overall molding accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of quartz crucibles, and specifically to an injection molding device for the production of quartz crucibles. Background Art

[0002] As an important consumable in the production of semiconductor materials, quartz crucibles are widely used in the production processes of polysilicon and monocrystalline silicon. Their production quality directly affects the service life of the crucibles and the quality of the products.

[0003] In traditional quartz crucible injection molding devices, the injection core barrel and the hot pressing die sleeve are prone to shift during the injection molding process, resulting in uneven distribution of the injected molten quartz liquid in the mold, causing uneven wall thickness of the crucible and low forming accuracy. To improve the quality and consistency of the finished products, it is necessary to improve the alignment and positioning of the components during the injection molding process to ensure uniform filling of the quartz liquid. The pressure control in the existing injection molding devices during the injection molding process is not stable enough. Especially during the filling process of the molten quartz liquid, due to pressure fluctuations or unstable motion mechanisms, it is easy to cause uneven filling, and even generate bubbles or voids. This phenomenon will directly affect the forming quality and density of the crucible, and reduce the mechanical strength of the finished product.

[0004] In view of this, research and improvement are carried out on the existing problems, and an injection molding device for the production of quartz crucibles is provided to solve the current problems. The aim is to accurately control the temperature and avoid the preheating and injection molding device that generates cooling cracks through this technology, so as to ensure the forming strength and density of the quartz crucible, achieving the purpose of solving problems and improving practical value. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] For this purpose, the technical solution adopted by the present invention is as follows: An injection molding device for the production of quartz crucibles includes: a working base frame, an injection driving assembly, an injection core barrel, a hot pressing die sleeve, and a forming die. Among them, an adjusting slide seat for adjusting the height of the injection driving assembly is slidably installed on the surface of the working base frame, the injection driving assembly is fixedly installed on the surface of the working base frame, the hot pressing die sleeve is slidably sleeved outside the injection core barrel, the forming die is of a two-piece structure, and a cavity is provided on the inner side, and the forming die is sleeved outside the hot pressing die sleeve.

[0007] In a possible implementation, the injection driving assembly includes a driving disk, a first guide rod, and a second guide rod. Among them, the bottom ends of the first guide rod and the second guide rod are respectively detachably connected to the top ends of the injection cartridge and the hot pressing die sleeve. The second guide rod is slidably sleeved outside the first guide rod. Connecting ears are fixedly installed at the top ends of the first guide rod and the second guide rod. Two mutually meshing driving first gear disk and second gear disk are rotatably installed on the surface of the driving disk. Crank connecting arms are movably connected to the surfaces of the first gear disk and the second gear disk. The number of the crank connecting arms is four and they are arranged in a rhombus shape, and the other ends are movably connected to the connecting ears on the surfaces of the first guide rod and the second guide rod.

[0008] In a possible implementation, an injection nozzle is provided on the top surface of the injection cartridge for connecting a fused quartz liquid conveying pipeline, and liquid outlet holes are provided on the outer periphery of the injection cartridge near the bottom end of the injection cartridge. A movable sleeve seat for connecting to the bottom end of the second guide rod is provided on the top surface of the hot pressing die sleeve. A heating coil is embedded inside the hot pressing die sleeve for heating and preheating the forming die and the injection cartridge.

[0009] In a possible implementation, the cavity inside the forming die is a frustum structure, and a guiding channel is provided along the surface of the split guiding cone to ensure that the fused quartz liquid is evenly distributed during the injection process, avoiding the generation of bubbles or voids, thereby improving the forming integrity of the quartz crucible.

[0010] In a possible implementation, the injection cartridge and the hot pressing die sleeve are sealingly sleeved, and during the injection molding process, the injection cartridge and the hot pressing die sleeve are kept sliding synchronously to achieve smooth lifting and lowering, ensuring the smooth injection of the fused quartz liquid during the injection molding process, avoiding uneven filling and the mixing of external air.

[0011] In a possible implementation, the sliding movement of the injection cartridge and the hot pressing die sleeve is driven by the first gear disk and the second gear disk in the injection driving assembly through the crank connecting arms, and the first guide rod and the second guide rod are respectively connected to the top ends of the injection cartridge and the hot pressing die sleeve, so that the injection cartridge gradually descends and the hot pressing die sleeve gradually rises during the injection molding process, ensuring the smoothness during the injection molding filling process and the continuity of the injection molding pressure.

[0012] In a possible implementation, a connecting flange is provided on the surface of the forming die, and through the detachable connection of the connecting flange, it is convenient to quickly demold after the crucible is formed, improving the demolding efficiency, and the frustum structure of the inner cavity can assist the smooth demolding of the quartz crucible after the injection molding is completed.

[0013] In a possible implementation, a high-temperature resistant two-way control valve is provided at the injection nozzle for regulating the injection speed and pressure of the fused quartz liquid, avoiding uneven forming of the bottom and side walls of the crucible caused by too fast or too slow injection of the liquid.

[0014] In a possible implementation, the injection barrel and the hot pressing die sleeve are provided with a positioning structure to ensure that the two always maintain coaxial alignment during the injection molding process, prevent deviation during the injection molding process, and further improve the forming accuracy and stability of the crucible.

[0015] In a possible implementation, the adjusting slide on the working base controls the height of the injection driving component through a hydraulic system, enabling the injection molding device to adjust its height according to the requirements of crucibles of different sizes, ensuring that the movement ranges of the injection barrel and the hot pressing die sleeve adapt to the injection molding space, thereby further improving the forming accuracy of the crucible.

[0016] The beneficial effects achieved by the present invention are as follows:

[0017] 1. In the present invention, by providing a sealing structure and a positioning structure between the injection barrel and the hot pressing die sleeve, coaxial alignment during the injection molding process is ensured, effectively avoiding forming defects caused by deviation or uneven injection, ensuring uniform filling of the molten quartz liquid, and improving the uniformity of the crucible wall thickness and the overall forming accuracy.

[0018] 2. In the present invention, the first gear disk and the second gear disk in the injection driving component drive the crank connecting rod to achieve synchronous control of the downward movement of the injection barrel and the upward movement of the hot pressing die sleeve. During the injection molding process, this structure can ensure continuous and stable injection molding pressure, avoid problems such as uneven filling and pressure fluctuations, thereby improving the stability of the production process and ensuring the forming integrity of the quartz crucible.

[0019] 3. In the present invention, the forming die and the injection barrel are preheated by heating coils embedded inside the hot pressing die sleeve, combined with precise adjustment of the injection nozzle at the top of the injection barrel, to achieve uniform temperature control during the injection process of the molten quartz liquid. This temperature control can not only prevent cooling cracks during the injection molding process, but also improve the density and strength of the crucible, thereby ensuring high-quality forming of the crucible. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the injection driving component, injection barrel and hot pressing die sleeve of an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the injection driving component of an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the injection barrel and the hot pressing die sleeve of an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the first guide rod and the second guide rod according to an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the internal structure of the molding die according to an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the injection molding process according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] 100, working base frame; 110, adjusting slide;

[0029] 200, injection driving assembly; 210, driving disk; 220, first guide rod; 230, second guide rod; 211, first gear disk; 212, second gear disk; 213, crank connecting arm;

[0030] 300, injection core barrel; 310, injection nozzle; 400, hot pressing die sleeve; 410, moving sleeve seat; 420, heating coil; 500, molding die; 510, cavity; 511, sub-guide cone; 600, crucible forming part. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the specific implementation manners and with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention.

[0033] The following describes an injection molding device for producing quartz crucibles provided by some embodiments of the present invention with reference to the accompanying drawings.

[0034] Combined with Figures 1 - 7 As shown, the present invention provides an injection molding device for producing quartz crucibles, which can solve the problems of low precision, unstable pressure, uneven temperature control, etc. in the injection molding process in the prior art, thereby improving the molding quality and production efficiency of the crucible.

[0035] The injection molding device includes components such as a working base frame 100, an injection driving assembly 200, an injection core barrel 300, a hot pressing die sleeve 400, and a molding die 500. Specifically, an adjusting slide 110 for adjusting the height of the injection driving assembly 200 is slidably installed on the surface of the working base frame 100, and the injection driving assembly 200 is fixedly installed on the surface of the working base frame 100 and its height is adjusted through the adjusting slide 110. With this structure, the height of the device can be adjusted according to the size requirements of quartz crucibles of different specifications, thereby ensuring the flexibility and adaptability in the injection molding process.

[0036] The hot pressing die sleeve 400 is slidably sleeved on the outside of the injection core barrel 300. The injection core barrel 300 and the hot pressing die sleeve 400 are sleeved with each other through a sealing structure, ensuring the sealing performance during the injection molding process and preventing the molten quartz liquid from leaking or being unevenly injected during the filling process. The forming die 500 is of a two-piece structure, and a cavity 510 is provided on the inner side for forming the specific forming space of the crucible. The forming die 500 is sleeved on the outside of the hot pressing die sleeve 400 to facilitate the relative movement of the hot pressing die sleeve 400 and the forming die 500 during the injection molding process, ensuring the smooth progress of the forming process.

[0037] The injection driving assembly 200 includes components such as a driving disk 210, a first guide rod 220, and a second guide rod 230. The bottom ends of the first guide rod 220 and the second guide rod 230 are respectively detachably connected to the top ends of the injection core barrel 300 and the hot pressing die sleeve 400. Through this design, it can be conveniently and quickly disassembled after the injection molding process is completed, improving the operation flexibility of the device. The second guide rod 230 is slidably sleeved on the outside of the first guide rod 220 and is fixedly installed with the first guide rod 220 through the connecting ear at the top end. Two mutually meshing first gear disks 211 and second gear disks 212 are rotatably installed on the surface of the driving disk 210, and the crank connecting arm 213 is driven through gear meshing to realize the movement of the four-bar linkage structure. This linkage structure can ensure the synchronous lifting and lowering of the injection core barrel 300 and the hot pressing die sleeve 400 during the injection molding process, making the injection molding pressure continuous and stable, and avoiding problems such as uneven filling or pressure fluctuation during the injection molding process.

[0038] During use, an injection nozzle 310 is provided on the top surface of the injection core barrel 300 for connecting the quartz molten liquid conveying pipeline, and liquid outlet holes are provided on the outer periphery of the injection core barrel 300 near the bottom end. The molten quartz liquid enters the injection core barrel 300 through the conveying pipeline and is evenly injected into the forming space in the forming die 500 from the bottom liquid outlet holes. In order to ensure the control of the injection speed and pressure of the molten quartz liquid during the injection molding process, a high-temperature resistant two-way control valve is provided on the injection nozzle 310 for precisely adjusting the flow rate and injection pressure of the quartz liquid, avoiding uneven forming of the bottom and side walls of the crucible due to too fast or too slow injection speed.

[0039] A moving sleeve seat 410 for connecting the bottom end of the second guide rod 230 is provided on the top surface of the hot pressing die sleeve 400, and a heating coil 420 is embedded and installed inside. This heating coil 420 can heat and preheat the forming die 500 and the injection core barrel 300, ensuring the uniformity of the mold temperature during the injection molding process. Through this heating device, cracks can be effectively prevented during the cooling process of the crucible, improving the forming strength and density of the crucible.

[0040] In the specific operation process, first, adjust the initial height of the injection driving assembly 200 by sliding the carriage 110 on the surface of the working base frame 100 to ensure that the device is in a suitable working position. Then, fixedly connect the bottom ends of the first guide rod 220 and the second guide rod 230 to the top ends of the injection barrel 300 and the hot pressing die sleeve 400 respectively to ensure the synchronous movement of the injection barrel 300 and the hot pressing die sleeve 400 during the injection molding process. During the process of pumping and pushing the molten quartz liquid, the crank connecting rod 213 is driven by the rotation of the first gear disk 211 and the second gear disk 212, so that the injection barrel 300 gradually descends, and at the same time, the hot pressing die sleeve 400 moves upward relative to the forming die 500, thereby ensuring smooth filling during the injection molding process and preventing forming defects caused by the entry of external air.

[0041] As Figure 7 shown, during the injection molding process, as the first gear disk 211 and the second gear disk 212 rotate synchronously, the downward movement of the first guide rod 220 and the injection barrel 300 is realized through the crank connecting rod 213. At the same time, the second guide rod 230 and the hot pressing die sleeve 400 gradually separate from the forming die 500, and the molten quartz liquid is injected through the bottom of the injection barrel 300 and filled into the cavity 510. When the hot pressing die sleeve 400 is gradually lifted to be flush with the top surface of the forming die 500, and the injection barrel 300 descends to be close to the surface of the sub-guide cone 511, a reserved gap is formed at the bottom of the crucible for the forming of the bottom surface of the quartz crucible. During the filling process, the forming die 500 and the injection barrel 300 are preheated and heated up by the heating coil 420 to ensure temperature uniformity and prevent cracks or bubbles from appearing when the quartz liquid cools.

[0042] After the injection molding is completed, maintain this state until it cools and solidifies, and then disassemble the two-piece structure of the forming die 500 to take out the formed crucible formed part 600. The entire injection molding process, through precise control devices and synchronous motion systems, ensures the forming quality, density, and dimensional accuracy of the quartz crucible, and further improves production efficiency.

[0043] Through the design of the present invention, not only can the common problems in the prior art such as uneven injection molding filling and unstable mold temperature control be solved, but also the forming accuracy and stability of the quartz crucible can be significantly improved, so as to meet the high-quality requirements for the quartz crucible in the semiconductor material production process.

[0044] The working principle and usage process of the present invention:

[0045] At the beginning of injection molding, the injection core barrel 300, the hot pressing mold sleeve 400 and the molding mold 500 structure of suitable specifications are selected, and the molds are closed after applying mold release powder inside the two molding molds 500. The injection core barrel 300 and the hot pressing mold sleeve 400 are sequentially sleeved inside the molding mold 500. The injection nozzle 310 and the moving sleeve seat 410 at the top of the injection core barrel 300 and the hot pressing mold sleeve 400 are respectively connected to the fused quartz liquid tube and the circuit, and the molding mold 500 and the injection core barrel 300 are preheated and heated by electric heating through the heating coil 420;

[0046] After adjusting the initial height of the injection drive assembly 200 by sliding the slide 110 on the surface of the working base 100, the bottom ends of the first guide rod 220 and the second guide rod 230 are fixedly connected to the top ends of the injection core barrel 300 and the hot pressing mold sleeve 400, respectively, and the movement of the injection core barrel 300 and the hot pressing mold sleeve 400 is controlled by the rotation drive of the first toothed disc 211 and the second toothed disc 212 during the process of pumping and pushing the molten quartz liquid;

[0047] like Figure 7 As shown in the figure: during the synchronous rotation of the first toothed disc 211 and the second toothed disc 212, the first guide rod 220 and the second guide rod 230 are linked by the surface crank link arm 213, so that the first guide rod 220 and the injection core barrel 300 move downward, while the second guide rod 230 and the hot pressing mold sleeve 400 move upward relative to the molding mold 500 and gradually separate from the interior of the molding mold 500, and the molten quartz liquid is injected through the bottom of the injection core barrel 300 toward the surface of the guide cone 511 and gradually fills the mold after being led out of the hot pressing mold sleeve 400. Inside the cavity 510, as the injection molding filling progresses, the hot pressing mold sleeve 400 is gradually lifted, and the injection core barrel 300 is gradually lowered to avoid filling gaps inside the cavity 510 caused by the mixing of external air, and the injection molding constant pressure is maintained until the bottom end of the hot pressing mold sleeve 400 rises to the top surface of the molding mold 500, and the injection core barrel 300 moves to a certain gap between the bottom surface and the surface of the guide cone 511 for molding the bottom surface of the quartz crucible, and this state is maintained until it is demolded after cooling and shaping, and the crucible molding 600 is taken out.

[0048] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An injection molding device for producing a quartz crucible, characterized in that: include: A working base frame (100), an injection drive assembly (200), an injection core barrel (300), a hot pressing mold sleeve (400) and a molding mold (500); an adjusting slide seat (110) for adjusting the height of the injection drive assembly (200) is slidably mounted on the surface of the working base frame (100); the injection drive assembly (200) is fixedly mounted on the surface of the working base frame (100); the hot pressing mold sleeve (400) is slidably sleeved on the outer side of the injection core barrel (300); the molding mold (500) is a two-petal structure and has a mold cavity (510) on the inner side; and the molding mold (500) is sleeved on the outer side of the hot pressing mold sleeve (400); The injection drive assembly (200) comprises a drive disk (210), a first guide rod (220) and a second guide rod (230), the bottom ends of the first guide rod (220) and the second guide rod (230) are detachably connected to the top ends of the injection core barrel (300) and the hot pressing mold sleeve (400) respectively, the second guide rod (230) is slidably sleeved on the outer side of the first guide rod (220), the top ends of the first guide rod (220) and the second guide rod (230) are fixedly installed with connecting ears, the surface of the drive disk (210) is rotatably installed with two first toothed disks (211) and second toothed disks (212) that are meshed with each other in a transmission manner, the surfaces of the first toothed disk (211) and the second toothed disk (212) are movably connected with crank connecting arms (213), the number of the crank connecting arms (213) is four and they are arranged in a rhombus shape, and the other ends are movably connected to the connecting ears on the surfaces of the first guide rod (220) and the second guide rod (230); The sliding movement of the injection core barrel (300) and the hot pressing mold sleeve (400) is driven by the first toothed disc (211) and the second toothed disc (212) in the injection drive assembly (200) via the crank arm (213), and the first guide rod (220) and the second guide rod (230) are respectively connected to the top of the injection core barrel (300) and the top of the hot pressing mold sleeve (400), so that during the injection molding process, the injection core barrel (300) gradually descends and the hot pressing mold sleeve (400) gradually rises, thereby ensuring stability during the injection molding filling process and continuity of the injection molding pressure.

2. The injection molding device for producing a quartz crucible according to claim 1, characterized in that: The mold cavity (510) inside the molding die (500) is a frustum structure, and a guide channel is provided along the surface of the guide cone (511), thereby ensuring that the molten quartz liquid is evenly distributed during the injection process, avoiding the generation of bubbles or voids, and thus improving the molding integrity of the quartz crucible.

3. The injection molding device for producing a quartz crucible according to claim 1, characterized in that: The injection core barrel (300) and the hot pressing mold sleeve (400) are sealed and sleeved together, and during the injection molding process, the injection core barrel (300) and the hot pressing mold sleeve (400) are kept sliding synchronously to achieve smooth lifting and lowering, thereby ensuring smooth injection of quartz melt during the injection molding process and avoiding uneven filling and mixing of external air.

4. The injection molding device for producing a quartz crucible according to claim 1, characterized in that: The surface of the molding die (500) is provided with a connecting flange, and the conical structure of the inner cavity (510) can assist in the smooth demoulding of the quartz crucible after the injection molding is completed.

5. The injection molding device for producing a quartz crucible according to claim 1, characterized in that: The top surface of the injection core barrel (300) is provided with an injection nozzle (310) for connecting to a quartz melt delivery pipeline, and the outer periphery of the injection core barrel (300) is provided with a liquid outlet hole close to the bottom end of the injection core barrel (300), and the top surface of the hot pressing mold sleeve (400) is provided with a movable sleeve seat (410) for connecting to the bottom end of the second guide rod (230), and a heating coil (420) is embedded and installed inside the hot pressing mold sleeve (400) for heating and preheating the molding mold (500) and the injection core barrel (300).

6. The injection molding device for producing a quartz crucible according to claim 5, characterized in that: The injection nozzle (310) is provided with a high temperature resistant two-way control valve for adjusting the injection speed and pressure of the molten quartz liquid to avoid uneven molding of the bottom and side walls of the crucible caused by too fast or too slow injection of the liquid.

7. The injection molding device for producing a quartz crucible according to claim 1, characterized in that: The injection core barrel (300) and the hot pressing mold sleeve (400) are provided with a positioning structure, which is used to ensure that the two always maintain coaxial alignment during the injection molding process.

8. The injection molding device for producing a quartz crucible according to claim 1, characterized in that: The adjusting slide (110) on the working base (100) controls the height of the injection drive assembly (200) through a hydraulic system, so that the injection molding device can be adjusted in height according to the requirements of crucibles of different sizes, ensuring that the movement range of the injection core barrel (300) and the hot pressing mold sleeve (400) is adapted to the injection molding space.

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