Injection molding device for quartz crucible production

Abstract

The invention relates to the technical field of quartz crucibles, in particular to an injection molding device for quartz crucible production, which comprises a working base frame, an injection driving assembly, an injection core tube, a hot pressing mold sleeve and a forming mold, an adjusting sliding seat for adjusting the height of the injection driving assembly is slidably mounted on the surface of the working base frame, and the injection driving assembly is fixedly mounted on the surface of the working base frame; the hot pressing die sleeve is slidably connected to the outer side of the injection core cylinder in a sleeving mode, the forming die is of a two-section structure, a cavity is formed in the inner side of the forming die, and the forming die is connected to the outer side of the hot pressing die sleeve in a sleeving mode. According to the invention, the sealing structure and the positioning structure are arranged between the injection core cylinder and the hot-pressing die sleeve, so that the coaxial alignment of the injection core cylinder and the hot-pressing die sleeve in the injection molding process is ensured, the molding defect caused by deviation or non-uniform injection is effectively avoided, the uniform filling of fused quartz liquid is ensured, and the uniformity of the wall thickness of the crucible and the precision of integral molding are improved.

Description

Technical Field

[0001] The invention relates to the technical field of quartz crucibles, in particular to an injection molding device for producing quartz crucibles. Background Art

[0002] Quartz crucibles are important consumables in the production of semiconductor materials and are widely used in the production of polysilicon and monocrystalline silicon. Their production quality directly affects the service life of the crucible and the quality of the product.

[0003] In traditional quartz crucible injection molding devices, the injection core barrel and the hot pressing mold sleeve are prone to offset during the injection molding process, resulting in the injected molten quartz liquid being unable to be evenly distributed in the mold, causing uneven crucible wall thickness and low molding accuracy. In order to improve the quality and consistency of the finished product, 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 of the existing injection molding device during the injection molding process is not stable enough, especially during the filling process of the molten quartz liquid, which is prone to uneven filling and even bubbles or gaps due to pressure fluctuations or unstable motion mechanisms. This phenomenon will directly affect the molding 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 quartz crucible production is provided to solve the current problems. The purpose is to use this technology to accurately control the temperature and avoid the preheating and injection molding device caused by cooling cracks, so as to ensure the molding strength and density of the quartz crucible, so as to achieve the purpose of solving the problem and improving the 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 technology.

[0006] To this end, the technical solution adopted by the present invention is: an injection molding device for producing quartz crucibles, comprising: a working base, an injection drive assembly, an injection core barrel, a hot pressing mold sleeve and a forming mold. Among them, the surface of the working base is slidably mounted with an adjustment slide for adjusting the height of the injection drive assembly, the injection drive assembly is fixedly mounted on the surface of the working base, the hot pressing mold sleeve is slidably sleeved on the outer side of the injection core barrel, the forming mold is a two-petal structure, and a cavity is opened on the inner side, and the forming mold is sleeved on the outer side of the hot pressing mold sleeve.

[0007] In a possible embodiment, the injection drive assembly includes a drive disk, a first guide rod and a second guide rod. The bottom ends of the first guide rod and the second guide rod are detachably connected to the top ends of the injection core barrel and the hot pressing mold sleeve, respectively, and the second guide rod is slidably sleeved on the outside of the first guide rod. The top ends of the first guide rod and the second guide rod are fixedly installed with connecting ears. The surface of the drive disk is rotatably installed with two first and second gear discs that are meshed with each other in transmission. The surfaces of the first and second gear discs are movably connected with crank arms. The number of crank arms is four and they are arranged in a rhombus shape, and the other end is movably connected with the connecting ears on the surfaces of the first and second guide rods.

[0008] In a possible implementation, the top surface of the injection core barrel is provided with an injection nozzle for connecting to a quartz melt delivery pipeline, and the outer circumference of the injection core barrel is provided with a liquid outlet near the bottom end of the injection core barrel. The top surface of the hot pressing mold sleeve is provided with a movable sleeve seat for connecting to the bottom end of the second guide rod, and a heating coil is embedded and installed inside the hot pressing mold sleeve for heating and preheating the molding mold and the injection core barrel.

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

[0010] In a possible embodiment, the injection core barrel and the hot pressing mold sleeve are sealed and connected, and during the injection molding process, the injection core barrel and the hot pressing mold sleeve are kept sliding synchronously to achieve smooth lifting and lowering, thereby ensuring smooth injection of the quartz melt during the injection molding process and avoiding uneven filling and mixing of external air.

[0011] In a possible embodiment, the sliding movement of the injection core barrel and the hot compression mold sleeve is driven by the first gear plate and the second gear plate in the injection drive assembly through the crank arm, and the first guide rod and the second guide rod are respectively connected to the top of the injection core barrel and the hot compression mold sleeve, so that the injection core barrel gradually descends and the hot compression mold sleeve gradually rises during the injection molding process, ensuring the stability of the injection molding filling process and the continuity of the injection molding pressure.

[0012] In a possible embodiment, a connecting flange is provided on the surface of the molding mold, and the detachable connection of the connecting flange facilitates rapid demolding after the crucible is formed, thereby improving demolding efficiency, and the inner cavity frustum structure can assist in the smooth demolding of the quartz crucible after the injection molding is completed.

[0013] In a possible implementation, the injection nozzle 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 too fast or too slow injection of the liquid, which results in uneven molding of the bottom and side walls of the crucible.

[0014] In a possible implementation manner, the injection core barrel and the hot pressing mold sleeve are provided with a positioning structure to ensure that the two are always coaxially aligned during the injection molding process, prevent deviation during the injection molding process, and further improve the molding accuracy and stability of the crucible.

[0015] In a possible embodiment, the adjustment slide on the working base controls the height of the injection drive assembly through a hydraulic system, so that the injection molding device can be height-adjusted according to the requirements of crucibles of different sizes, ensuring that the movement range of the injection core barrel and the hot pressing mold sleeve adapts to the injection molding space, thereby further improving the molding accuracy of the crucible.

[0016] The beneficial effects achieved by the present invention are: 1. In the present invention, a sealing structure and a positioning structure are provided between the injection core barrel and the hot pressing mold sleeve to ensure coaxial alignment of the two during the injection molding process, effectively avoiding molding defects caused by offset or uneven injection, ensuring uniform filling of the molten quartz liquid, and improving the uniformity of the crucible wall thickness and the overall molding accuracy.

[0017] 2. In the present invention, the first and second gear discs in the injection drive assembly drive the crank arm to achieve synchronous control of the downward movement of the injection core barrel and the upward movement of the hot pressing mold sleeve. During the injection molding process, this structure can ensure that the injection molding pressure is continuously stable, avoiding problems such as uneven filling and pressure fluctuations, thereby improving the stability of the production process and ensuring the molding integrity of the quartz crucible.

[0018] 3. In the present invention, the molding die and the injection core barrel are preheated by the heating coil embedded in the hot pressing mold sleeve, and the injection nozzle at the top of the injection core barrel is precisely adjusted to achieve uniform temperature control during the injection of the molten quartz liquid. This temperature control can not only prevent cooling cracks during the injection molding process, but also improve the compactness and strength of the crucible, thereby ensuring high-quality molding of the crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of an injection drive assembly, an injection core barrel and a hot pressing mold sleeve according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an injection drive assembly according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of an injection core barrel and a hot pressing mold sleeve according to an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a first guide rod and a second guide rod according to an embodiment of the present invention; Figure 6A schematic diagram of the internal structure of a molding die according to an embodiment of the present invention; Figure 7 Schematic diagram of the injection molding process according to one embodiment of the present invention.

[0020] Reference numerals: 100. working base frame; 110. adjusting slide seat; 200, injection drive assembly; 210, drive disc; 220, first guide rod; 230, second guide rod; 211, first toothed disc; 212, second toothed disc; 213, crank arm; 300, injection core barrel; 310, injection nozzle; 400, hot pressing mold sleeve; 410, movable sleeve seat; 420, heating coil; 500, forming mold; 510, cavity; 511, guide cone; 600, crucible forming part. DETAILED DESCRIPTION

[0021] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0023] An injection molding device for producing a quartz crucible provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0024] Combination Figure 1-Figure 7 As shown, the present invention provides an injection molding device for producing a quartz crucible, 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.

[0025] The injection molding device includes components such as 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. Specifically, an adjustment slide 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, and the height is adjusted by adjusting the slide 110. Through this structure, the height of the device can be adjusted according to the size requirements of quartz crucibles of different specifications, thereby ensuring flexibility and adaptability during the injection molding process.

[0026] The hot pressing mold sleeve 400 is slidably sleeved on the outer side of the injection core barrel 300, and the injection core barrel 300 and the hot pressing mold sleeve 400 are sleeved with each other through a sealing structure, which ensures the sealing during the injection molding process and prevents the molten quartz liquid from leaking or unevenly injected during the filling process. The molding mold 500 is a two-petal structure, and a cavity 510 is opened on the inner side to form a specific molding space of the crucible. The molding mold 500 is sleeved on the outer side of the hot pressing mold sleeve 400, so that the hot pressing mold sleeve 400 and the molding mold 500 can move relative to each other during the injection molding process, ensuring the smooth progress of the molding process.

[0027] The injection drive assembly 200 includes a drive disk 210, a first guide rod 220, a second guide rod 230 and other components. 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. Through this design, it can be conveniently and quickly disassembled after the injection molding process is completed, thereby improving the operational flexibility of the device. The second guide rod 230 is slidably sleeved on the outer side of the first guide rod 220, and is fixedly installed with the first guide rod 220 through the connecting ear at the top. The surface of the drive disk 210 is rotatably installed with two first and second gear discs 211 and 212 that are mutually transmission-engaged, and the crank connecting arm 213 is driven by gear meshing to realize the movement of the four-point connecting rod structure. The connecting rod structure can ensure the synchronous lifting and lowering of the injection core barrel 300 and the hot pressing mold sleeve 400 during the injection molding process, so that the injection molding pressure is continuously stable, and the problem of uneven filling or pressure fluctuation during the injection molding process is avoided.

[0028] During use, the top surface of the injection core barrel 300 is provided with an injection nozzle 310 for connecting the molten quartz liquid delivery pipeline, and a liquid outlet hole is opened near the bottom of the outer periphery of the injection core barrel 300. The molten quartz liquid enters the injection core barrel 300 through the delivery pipeline, and is evenly injected into the molding space in the molding mold 500 from the bottom liquid outlet hole. 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 accurately adjusting the flow rate and injection pressure of the quartz liquid to avoid uneven molding of the bottom and side walls of the crucible due to too fast or too slow injection speed.

[0029] The top surface of the hot pressing mold sleeve 400 is provided with a movable sleeve seat 410 for connecting with the bottom end of the second guide rod 230, and a heating coil 420 is embedded and installed inside. The heating coil 420 is a heating coil that can preheat the forming mold 500 and the injection core barrel 300 to ensure the uniformity of the mold temperature during the injection molding process. Through this heating device, cracks can be effectively prevented from occurring during the cooling process of the crucible, and the molding strength and density of the crucible can be improved.

[0030] In the specific operation process, firstly, the initial height of the injection drive assembly 200 is adjusted by adjusting the slide 110 to slide on the surface of the working base 100 to ensure that the device is in a suitable working position. Then, 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 to ensure that the injection core barrel 300 and the hot pressing mold sleeve 400 move synchronously during the injection molding process. In the process of pumping and pushing the molten quartz liquid, the crank arm 213 is driven by the rotation of the first toothed disc 211 and the second toothed disc 212, so that the injection core barrel 300 gradually descends, and at the same time, the hot pressing mold sleeve 400 ascends relative to the molding mold 500, thereby ensuring smooth filling during the injection molding process and preventing molding defects caused by the entry of external air.

[0031] like Figure 7 As shown, during the injection molding process, as the first toothed disc 211 and the second toothed disc 212 rotate synchronously, the first guide rod 220 and the injection core barrel 300 move downward through the crank arm 213, and at the same time, the second guide rod 230 and the hot pressing mold sleeve 400 gradually separate from the molding mold 500, and the molten quartz liquid is injected and filled into the mold cavity 510 through the bottom of the injection core barrel 300. When the hot pressing mold sleeve 400 is gradually lifted to be flush with the top surface of the molding mold 500, and the injection core barrel 300 descends to the surface close to the guide cone 511, a reserved gap is formed at the bottom of the crucible for molding the bottom surface of the quartz crucible. During the filling process, the molding mold 500 and the injection core barrel 300 are preheated and heated by electric heating of the heating coil 420 to ensure temperature uniformity and prevent cracks or bubbles from appearing when the quartz liquid is cooled.

[0032] After the injection molding is completed, the state is maintained until cooling and finalization, and then the two-piece structure of the molding mold 500 is disassembled to take out the formed crucible molding 600. The entire injection molding process ensures the molding quality, density and dimensional accuracy of the quartz crucible through a precise control device and a synchronous motion system, further improving the production efficiency.

[0033] The design of the present invention can not only solve the common problems of uneven injection molding filling and unstable mold temperature control in the prior art, but also significantly improve the molding accuracy and stability of the quartz crucible, thereby meeting the high quality requirements for quartz crucibles in the production process of semiconductor materials.

[0034] The working principle and use process of the present invention: 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; 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; 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.

[0035] 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.

[0036] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 disc (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 mounted with connecting ears; the surface of the drive disc (210) is rotatably mounted with two first toothed discs (211) and second toothed discs (212) which are meshed with each other in transmission; the surfaces of the first toothed disc (211) and the second toothed disc (212) are movably connected with crank connecting arms (213); the crank connecting arms (213) are four in number and 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).

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 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.

5. 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.

6. 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).

7. The injection molding device for producing a quartz crucible according to claim 1, 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.

8. 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.

9. 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.

Images