Mold for preparing crucible
By adding small diameter through holes and enlarged hole spacing in the upper area of the crucible mold, the problems of many micro bubbles at the upper entrance of the crucible, thin vacuum layer and uneven external surface are solved, and higher quality crucible molding is achieved.
Patent Information
- Application Number
- CN202421545234.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-02
AI Technical Summary
During the casting process, existing crucible molds cause many micro bubbles at the upper end of the crucible, thin vacuum layer thickness, and uneven external surfaces.
A small and dense through hole is provided in the area closest to the upper opening of the mold, the diameter of the through hole outer end of the first section of the opening area is increased, and the hole spacing is expanded to improve the vacuum effect.
The outer bubbles of the crucible are reduced, the thickness of the vacuum transparent layer of the inner layer is increased, and the smoothness and transparency of the upper port of the crucible are improved.
Smart Images
Figure CN222933018U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of molding dies, and particularly relates to a die for preparing a crucible. Background Art
[0002] For a crucible cast and formed using a die, the cross-sectional structure of the die refers to Figure 1 , through holes are provided throughout the die, a water jacket is provided outside the die, a vacuum extraction cavity is formed between the inner wall of the water jacket and the outer wall of the die, and the vacuum extraction cavity communicates with the through holes on the die and a vacuum extraction system. The crucible after one casting has an integrally formed inner layer and outer layer. The outer layer is an opaque layer with uniformly distributed bubbles, and the inner layer is a vacuum transparent layer without bubbles.
[0003] Currently, the cast crucible has the problems of many micro-bubbles at the upper opening and a thin vacuum layer formed. The reasons are as follows: The vacuum extraction port of the vacuum extraction system is arranged at the bottom of the vacuum extraction cavity, that is, at the outer bottom of the die. Therefore, the vacuum extraction effect on the top of the die is worse than that on the bottom of the die, resulting in the above problems.
[0004] Related improvement technologies arrange small and dense through holes in the area closest to the upper opening of the die (the first opening area). The outer ends (the ends close to the vacuum cavity) of several rows (for example, 3 - 6 rows) of through holes in the area closest to the upper opening (the first opening area) have a diameter range of 3 - 5 mm, and the hole pitch is 20 ± 5 mm, so as to provide the vacuum extraction effect in the area adjacent to the upper opening of the crucible die, thereby improving the quality of the upper opening of the formed crucible. However, this will cause the position of the upper opening of the outer surface of the crucible to be uneven. Utility Model Content
[0005] This application provides a die that can both reduce the unevenness of the outer surface of the upper opening of the formed crucible, and reduce micro-bubbles and increase the thickness of the vacuum layer of the crucible. For this purpose, the following technical solutions are adopted in this application.
[0006] A die for preparing a crucible includes a cylindrical sleeve-shaped upper part and an outwardly convex spherical bottom. A plurality of areas of the die are densely provided with through holes. The opening areas are divided into four sections, namely: the upper part includes an upper opening, a first opening area, and a second opening area from the top to the bottom; the upper part and the outwardly convex spherical bottom are smoothly connected, and this smooth connection part is the third opening area; the outwardly convex spherical bottom has a fourth opening area. The aperture of the first opening area at the end close to the outer wall of the die is 5 - 8 mm, and the hole pitch of the first opening area is 33 ± 5 mm.
[0007] By adopting the above technical solution, the outer diameter of the through-hole at the outer end of the first opening area near the upper opening area is increased. During the vacuum pumping process of preparing the crucible, the vacuum pressure evenly distributed to the upper opening is greater, so that the outer layer bubbles of the crucible are reduced, that is, the outer layer becomes thinner. Correspondingly, the vacuum transparent layer of the inner layer becomes thicker. Under the same process, the micro-bubbles at the upper opening of the crucible are reduced, the thickness of the transparent layer at the upper opening of the crucible is increased, and the smoothness of the upper opening of the crucible product is increased. This solution also expands the hole spacing of the first opening area, which can effectively reduce the influence of the through-holes on the outer surface shape of the crucible, making the outer surface of the upper part of the crucible smoother. Currently, when using a mold with denser upper opening row holes, the outer surface of the prepared crucible will be uneven.
[0008] A preferred structure of the mold for preparing the crucible is that the first opening area has 3 - 6 rows of holes in the longitudinal direction from top to bottom.
[0009] By adopting the above technical solution, for the first opening area with 3 - 6 rows of holes, after expanding the holes and widening the spacing, the appearance of the crucible prepared using this mold is smooth.
[0010] A preferred structure of the mold for preparing the crucible is that each through-hole in the first opening area includes a coaxial first section hole and a second section hole. The first section hole is connected to the inner wall of the mold, and the second section hole is connected to the outer wall of the mold; the aperture of the second section hole is 5 - 8 mm; the aperture of the second section hole is smaller than that of the first section hole, and the aperture of the first section hole is larger than that of the second section hole by within 5 mm.
[0011] By adopting the above technical solution, the outer diameter of the through-hole at the outer end near the outer wall of the mold is increased. During the vacuum pumping process of preparing the crucible, the vacuum pressure evenly distributed to the upper opening is greater, so that the outer layer bubbles of the crucible are reduced, that is, the outer layer becomes thinner. Correspondingly, the vacuum transparent layer of the inner layer becomes thicker. Under the same process, the micro-bubbles at the upper opening are reduced, the thickness of the transparent layer at the upper opening of the crucible is increased, and the smoothness of the upper opening of the crucible product is increased. The aperture of the first section hole is larger than that of the second section hole by within 5 mm, which reduces the influence of the first section hole on the smoothness of the outer surface of the crucible.
[0012] A preferred structure of the mold for preparing the crucible is that the mold further includes a plurality of filter meshes; one filter mesh is installed on the end surface where each first section hole is connected to the second section hole.
[0013] By adopting the above technical solution, since the aperture of the second section hole is smaller than that of the first section hole, one filter mesh can be installed on the end surface where each first section hole is connected to the second section hole. It can not only allow air to pass through and be vacuumed, but also provide a greater resistance to the quartz liquid, making the outer surface of the quartz crucible relatively flat.
[0014] A preferred structure of the mold for preparing the crucible is that the length of the first section of holes is 1 / 5 to 1 / 2 of the length of the second section of holes.
[0015] By adopting the above technical solution, the influence of the first section of holes on the flatness of the outer wall of the quartz crucible is reduced.
[0016] A preferred structure of the mold for preparing the crucible is that the upper opening is a flange structure; the transverse wall thickness at the top of the flange structure is 35 - 70 mm.
[0017] By adopting the above technical solution, the flange thickness of the upper opening of the traditional mold is 15 - 35 mm, which is now improved to 35 - 70 mm. Increasing the flange thickness of the upper opening, that is, increasing the strength of the upper opening flange, effectively prevents the upper opening from cracking and reduces the probability of impurities entering the crucible, further improving the quality of the crucible.
[0018] A preferred structure of the mold for preparing the crucible is that the hole pitch in the second section of the opening area is the same as the hole pitch in the first section of the opening area.
[0019] By adopting the above technical solution, the holes in the upper part of the mold are uniform, and the appearance flatness of the crucible after molding is better.
[0020] A preferred structure of the mold for preparing the crucible is that the hole pitch in the third section of the opening area is 50 ± 10 mm.
[0021] By adopting the above technical solution, the third section of the opening area is closer to the vacuum pumping port. Setting the hole pitch in the third section of the opening area to be larger than the hole pitch in the second section of the opening area makes the vacuum pressure in the two areas more balanced, which is beneficial to forming a crucible with a flat appearance.
[0022] A preferred structure of the mold for preparing the crucible is that the hole pitch in the fourth section of the opening area is the same as the hole pitch in the third section of the opening area.
[0023] By adopting the above technical solution, the fourth section of the opening area is located at the bottom of the mold. The pressure caused by the gravity of the liquid quartz here is large, and the vacuum pumping pressure slightly greater than that in the third section of the opening area is required. And the fourth section of the opening area directly faces the vacuum pumping port, with a large vacuum pressure. After balancing, the vacuum pressures in the two sections of the opening area are balanced, and the crucible prepared has a flat appearance.
[0024] In summary, the mold for preparing the crucible of the present application has the following beneficial effects: by increasing the outer diameter of the through-hole at the outer end of the first opening area near the upper opening area, during the vacuum pumping process of preparing the crucible, the vacuum pressure evenly distributed to the upper opening is greater, reducing the outer-layer bubbles of the crucible, that is, the outer layer becomes thinner. Correspondingly, the vacuum transparent layer of the inner layer becomes thicker. Under the same process, the micro-bubbles at the upper opening are reduced, the thickness of the transparent layer at the upper opening of the crucible is increased, and the smoothness of the upper opening of the crucible product is increased. This solution also expands the hole spacing of the first opening area, which can effectively reduce the influence of the through-holes on the outer surface shape of the crucible, making the outer surface of the upper part of the crucible smoother. Currently, when using a mold with denser upper-opening row holes, the outer surface of the prepared crucible will be uneven. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 Schematic cross-sectional structure diagram of the mold in the background art.
[0026] Figure 2 Schematic cross-sectional structure diagram of the mold of the present application.
[0027] Figure 3 For Figure 2 Enlarged view of the through-hole in the A circular area of
[0028] Figure 4 The mold of the present application marks the wall thickness of the upper flange.
[0029] Reference numerals: upper part 1; bottom of the convex spherical surface 2; through-hole 3; upper opening 11; first opening area 12; second opening area 13; third opening area 4; fourth opening area 21; first-section hole 31; second-section hole 32; filter screen 5. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0030] The following specifically describes the mold for preparing the crucible of the present application with reference to the accompanying drawings.
[0031] Currently, for the mold used to prepare the crucible, there are problems such as a thin vacuum layer and a large number of micro-bubbles at the upper opening 11 of the prepared crucible. The main reason is that the through-holes 3 at the upper opening 11 of the mold are arranged densely. The diameter range of the through-holes 3 at the upper opening 11 of the traditional mold is 3 - 5 mm, and the hole spacing is 20 ± 5 mm, resulting in an uneven outer surface at the position of the upper opening 11 of the crucible.
[0032] Refer to Figure 2, this application proposes a mold for preparing a crucible. The mold includes a cylindrical sleeve-shaped upper part 1 and an outwardly convex spherical bottom 2. A plurality of regions of the mold are densely distributed with through holes 3, and the opening regions are divided into four sections, namely: the upper part 1 includes an upper opening 11 from the top to the bottom, a first section opening region 12, and a second section opening region 13; the upper part 1 and the outwardly convex spherical bottom 2 are smoothly connected, and this smooth connection part is the third section opening region 4; the outwardly convex spherical bottom 2 has a fourth section opening region 21. The outwardly convex spherical bottom 2 can be a structure similar to a spherical surface.
[0033] The aperture of the first section opening region 12 at one end close to the outer wall of the mold is 5-8 mm, for example, 5 mm, 6 mm, 7 mm. The hole pitch of the first section opening region 12 is 33±5 mm, for example, 30 mm, 36 mm. This mold increases the outer diameter of the outer end of the through hole 3 in the first section opening region 12 in the area close to the upper opening 11. During the vacuum pumping process of preparing the crucible, the vacuum pressure evenly distributed to the upper opening 11 is greater, so that the outer layer bubbles of the crucible are reduced, that is, the outer layer becomes thinner. Correspondingly, the vacuum transparent layer of the inner layer becomes thicker. Under the same process, the micro-bubbles at the upper opening 11 of the crucible are reduced, the thickness of the transparent layer at the upper opening 11 of the crucible is increased, and the smoothness of the upper opening 11 of the crucible product is increased. This solution also expands the hole pitch of the first section opening region 12, which can effectively reduce the influence of the through hole 3 on the outer surface shape of the crucible, making the outer surface of the upper part 1 of the crucible smoother. Currently, when using a mold with denser holes arranged at the upper opening 11, the outer surface of the prepared crucible will be uneven.
[0034] The first section opening region 12 can be 3-6 rows of holes in the longitudinal direction from top to bottom. For the first section opening region 12 with 3-6 rows of holes, after expanding the holes and widening the pitch, the appearance of the crucible prepared using this mold is smooth.
[0035] Reference Figure 3 , each through hole 3 in the first section opening region 12 includes a coaxial first section hole 31 and a second section hole 32. The first section hole 31 is connected to the inner wall of the mold, and the second section hole 32 is connected to the outer wall of the mold; the aperture of the second section hole 32 is 5-8 mm, for example, 6 mm; the aperture of the second section hole 32 is smaller than the aperture of the first section hole 31, and the aperture of the first section hole 31 is larger than the aperture of the second section hole 32 by within 5 mm. For example, the aperture of the first section hole 31 is 4 mm larger than the aperture of the second section hole 32.
[0036] For the above-mentioned mold, the outer diameter of the outer end of the through hole 3 near the outer wall of the mold is increased. During the vacuum pumping process of preparing the crucible, the vacuum pressure evenly distributed to the upper opening 11 is greater, reducing the number of bubbles in the outer layer of the crucible, that is, the outer layer becomes thinner. Correspondingly, the vacuum transparent layer of the inner layer becomes thicker. Under the same process, the micro-bubbles at the upper opening 11 are reduced, the thickness of the transparent layer at the upper opening 11 of the crucible is increased, and the smoothness of the upper opening 11 of the crucible product is increased. The aperture of the first section hole 31 is less than 5 mm larger than the aperture of the second section hole 32, reducing the influence of the first section hole 31 on the smoothness of the outer surface of the crucible.
[0037] Reference Figure 3 , the mold further includes a plurality of filter meshes 5. One filter mesh 5 is installed on the end surface where each first section hole 31 is connected to the second section hole 32. Since the aperture of the second section hole 32 is smaller than that of the first section hole 31, one filter mesh 5 can be installed on the end surface where each first section hole 31 is connected to the second section hole 32, which can not only allow air to pass through and be evacuated, but also provide a greater resistance to the quartz liquid, making the outer surface of the quartz crucible relatively flat.
[0038] The length of the first section hole 31 is 1 / 5 to 1 / 2 of the length of the second section hole 32. When preparing the crucible, there is a risk that the molten liquid quartz leaks through the through hole 3. However, due to the strong surface tension of the liquid quartz, designing a shorter first section hole 31 has a smaller impact on the flatness of the outer wall of the quartz crucible.
[0039] In a preferred embodiment, the through holes 3 in the second section opening area 13, the third section opening area 4, and the fourth section opening area 21 have the same structure as the through holes 3 in the first section opening area 12. Among the second section opening area 13, the third section opening area 4, and the fourth section opening area 21, the aperture of the second section hole 32 of each through hole 3 is 3 - 5 mm, and the aperture of the first section hole 31 of each through hole 3 is 7 - 8 mm.
[0040] Reference Figure 4 , the upper opening 11 is of a flange structure. The transverse wall thickness at the top of the flange structure is 35 - 70 mm. The flange thickness of the upper opening 11 of the traditional mold is 15 - 35 mm, which is now improved to 35 - 70 mm. Increasing the flange thickness of the upper opening 11, that is, increasing the strength of the flange of the upper opening 11, effectively prevents the upper opening 11 from cracking, reduces the probability of impurities entering the crucible, and further improves the quality of the crucible.
[0041] Preferably, the hole pitch in the second section opening area 13 is the same as the hole pitch in the first section opening area 12, making the holes in the upper part 1 of the mold evenly distributed and the appearance flatness of the formed crucible better.
[0042] Optionally, the hole pitch of the third section of the perforated area 4 is 50±10 mm. The third section of the perforated area 4 is closer to the vacuum pumping port. The hole pitch of the third section of the perforated area 4 is set to be larger than that of the second section of the perforated area 13, so that the vacuum pressures in the two areas are more balanced, which is beneficial to forming a crucible with a flat appearance.
[0043] Preferably, the hole pitch of the fourth section of the perforated area 21 is the same as that of the third section of the perforated area 4. The fourth section of the perforated area 21 is located at the bottom of the mold. Here, the pressure caused by the gravity of the liquid quartz is large, and the vacuum pressure for pumping needs to be slightly greater than that of the third section of the perforated area 4. And the fourth section of the perforated area 21 directly faces the vacuum pumping port, with a large vacuum pressure. After balancing, the vacuum pressures in the two sections of the perforated areas are balanced, and the outer surface of the prepared crucible is flat.
[0044] The mold of the present application: (1) increasing the diameter of the through hole 3 in the first section of the perforated area 12, so that the vacuum pressure evenly distributed to the upper opening 11 is greater. Under the same process, the thickness of the transparent layer at the upper opening 11 of the crucible can be increased, and the appearance flatness at the upper opening 11 of the product can be increased; (2) increasing the hole pitch of the first section of the perforated area 12 can effectively reduce the influence of the through hole 3 on the flatness of the outer surface of the crucible; (3) increasing the flange thickness of the upper opening 11, that is, increasing the strength at the flange of the upper opening 11, effectively preventing the upper opening 11 of the mold from cracking, reducing the probability of impurities entering the crucible, and further improving the quality of the crucible. The outer surface of the crucible prepared by the mold of the present application is flat as a whole, and the outer wall of the crucible corresponding to the first section of the perforated area of the mold is smooth. When using a traditional mold with denser holes arranged at the upper opening, the outer surface of the prepared crucible will be uneven, and its outer surface is not flat, especially the outer wall of the crucible corresponding to the first section of the perforated area of the mold is uneven and not beautiful.
[0045] The above are only some embodiments of the present application. The protection scope of the present application is not limited to the above embodiments. For those of ordinary skill in the art in this technical field, several improvements and retouches made without departing from the creative design of the present application should also fall within the protection scope of the present application.
Claims
1. A mold for preparing a crucible, characterized in that: It comprises a cylindrical sleeve-shaped upper portion (1) and an outer convex spherical bottom portion (2); The mold has multiple areas densely covered with through holes (3), and the opening area is divided into four sections, namely: the upper part (1) includes an upper opening (11) from the top to the bottom, a first opening area (12) and a second opening area (13); the upper part (1) and the outer convex spherical bottom (2) are smoothly connected, and the smooth connection is the third opening area (4); the outer convex spherical bottom (2) has a fourth opening area (21); The hole diameter of the first section of the opening area (12) close to one end of the outer wall of the mold is 5-8 mm, and the hole spacing of the first section of the opening area (12) is 33±5 mm.
2. The mold for preparing a crucible according to claim 1, characterized in that: The first section of the opening area (12) has 3 to 6 rows of holes in the longitudinal direction from top to bottom.
3. The mold for preparing a crucible according to claim 1, characterized in that: Each through hole (3) of the first section opening area (12) comprises a coaxial first node hole (31) and a second node hole (32); the first node hole (31) is connected to the inner wall of the mold, and the second node hole (32) is connected to the outer wall of the mold; the aperture of the second node hole (32) is 5-8 mm; the aperture of the second node hole (32) is smaller than the aperture of the first node hole (31), and the aperture of the first node hole (31) is larger than the aperture of the second node hole (32) by no more than 5 mm.
4. The mold for preparing a crucible according to claim 3, characterized in that: The mould further comprises a plurality of filter screens (5); one filter screen (5) is installed on the end surface of each of the first node holes (31) connected to the second node holes (32).
5. The mold for preparing a crucible according to claim 3 or 4, characterized in that: The length of the first node hole (31) is 1 / 5 to 1 / 2 of the length of the second node hole (32).
6. The mold for preparing a crucible according to claim 3, characterized in that: The upper opening (11) is a flange structure; the transverse wall thickness of the top end of the flange structure is 35-70 mm.
7. The mold for preparing a crucible according to claim 1, characterized in that: The hole spacing of the second section of the opening area (13) is the same as the hole spacing of the first section of the opening area (12).
8. The mold for preparing a crucible according to claim 1, characterized in that: The hole spacing of the third section opening area (4) is 50±10 mm.
9. The mold for preparing a crucible according to claim 8, characterized in that: The hole spacing of the fourth section of the opening area (21) is the same as the hole spacing of the third section of the opening area (4).