Mould pressing equipment and mould pressing process for aspheric fisheye type glass lens
Through aspherical fisheye glass lens molding equipment and molding process, the prefabricated parts are fixed by using positioning stop rings and high-temperature springs to solve the gas blockage problem, achieve efficient production and high-quality lens manufacturing, and support optical design.
Patent Information
- Application Number
- CN202510867994.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-26
- Publication Date
- 2025-08-15
AI Technical Summary
There is gas blockage in the production of existing fish-eye aspherical glass lenses, which leads to the inability to completely compact the top part. The traditional cold processing efficiency is low and the cost is high, and there is turning marking on the surface of the glass lens that affects use.
The aspherical fish-eye glass lens molding equipment is used to fix the prefabricated parts by positioning the material barrier ring and high-temperature spring, combined with an optimized molding process, including preheating, slow mold closing and slow cooling, to avoid the formation of gas cavity and achieve self-demolding.
Improves production efficiency, reduces costs, improves the surface quality of glass lenses, and supports optical design optimization.
Smart Images
Figure CN120483494A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of molding production of fisheye type aspheric glass lenses, and in particular to an aspheric fisheye type glass lens molding device and a molding process. Background Art
[0002] Currently, the production of fisheye aspheric glass lenses in the market is still primarily based on traditional cold-working single-point turning. This not only results in low processing efficiency and high costs, but also often leaves noticeable turning marks on the surface of the glass lens, significantly impacting the usability of the final product. Conventional pressing, however, is limited by the shape of the preform and mold, which can cause air blockage during the manufacturing process, preventing the top portion of the glass lens from being fully compacted and ultimately preventing production. Therefore, a new method for producing "fisheye" aspheric glass lenses has emerged. Summary of the Invention
[0003] The purpose of the present invention is to provide an aspheric fisheye glass lens molding device and molding process, which are used to solve the technical problem of air blockage caused by the molding of existing fisheye aspheric glass lenses.
[0004] The technical solution of the present invention is achieved as follows: In one aspect, the present application provides an aspherical fisheye glass lens molding device, comprising: An inverted convex upper die and a lower die arranged below the upper die, an aspheric fisheye-shaped cavity is provided on the top of the lower die, and a positioning stop ring for fixing the preform is provided between the upper die and the lower die, the positioning stop ring is elastically arranged between the upper die and the lower die through a plurality of high-temperature springs distributed in a ring shape at the bottom, the bottom of the high-temperature spring is arranged in the top mounting ring groove of the lower die, and the top of the high-temperature spring is connected to the lower surface of the positioning stop ring, during the downward pressing process of the upper die, the positioning stop ring drives the preform to move downward with the upper die, and during the upward resetting process of the upper die, the positioning stop ring drives the preform to move upward with the upper die.
[0005] Optionally, the lower stamping section of the upper die and the upper stamping section of the lower die are sleeved in a sleeve, and the sleeve is provided with a plurality of first exhaust holes, which are used to discharge the air squeezed out during the downward movement of the positioning retaining ring.
[0006] Optionally, the upper mold core and the lower mold core are sleeved in a middle meat sleeve, and the middle meat sleeve is located on the periphery of the sleeve. At the same time, a second exhaust hole is provided on the middle meat sleeve. The air discharged from the first exhaust hole passes through the annular gap between the middle meat sleeve and the sleeve to reach the second exhaust hole for discharge.
[0007] Optionally, a lower pressing plate is provided on the top of the upper die core, and the lower pressing plate is connected to the telescopic end of the press.
[0008] On the other hand, the present application provides a molding process for an aspherical fisheye glass lens molding device, the molding process comprising: Assemble the upper die, sleeve, lower die, middle sleeve, preform, positioning ring and high-temperature spring, and then send them into the molding area; Adjust the molding equipment parameters so that the pressure plate contacts the upper mold core but does not apply pressure, which facilitates better heat transfer during heating; The upper mold is preheated to a surface viscosity of 10^7.6 for 30-33 seconds. At this point, the center of the preform begins to sink due to its own gravity, while the sides are blocked by the tapered surface of the positioning retaining ring and cannot sink. Therefore, the center of the lower mold is able to contact the preform first, avoiding the formation of air cavities. A pressure of 0.44-0.47 MPa is applied to the upper mold through the pressure plate, causing the 6-glass preform to slowly extend from the center of the lower mold toward the edge. At this time, the gas originally existing in the sleeve will be discharged through the first and second exhaust holes during the mold closing process; When the pressure plate presses to the upper end of the middle sleeve, the entire pressing stroke is completed. At this time, the pressure is continuously applied for about 60 seconds, so that the shape of the fisheye aspheric glass lens is completely formed; Adjust the equipment parameters again to allow the formed fisheye aspheric glass lens to cool down slowly. The whole process lasts for 120-130 seconds. Since fisheye aspheric glass lenses are often thick, rapid cooling will form a large concentrated stress inside the glass lens, which may cause breakage. Therefore, slow cooling is required to release the stress inside the glass lens. When the temperature drops to about 50°C, the pressure on the pressure plate is removed. At this time, the glass lens is slowly demolded from the lower mold core under the action of the positioning retaining ring and the high-temperature spring to prevent the surface of the glass lens from being in contact with the surface of the lower mold core for a long time, thereby forming a vacuum cavity after complete cooling, which makes demolding difficult. Finally, the glass lens is removed from the positioning retaining ring 7 for relevant specification and size inspection.
[0009] The beneficial effects of the present invention are: The aspheric fisheye glass lens molding equipment described in the present invention can fix the spherical preform in the center of the mold core by adding a positioning retaining ring and a high-temperature spring. The elastic force of the high-temperature spring can make the spherical preform suspended above the lower mold core so that they do not make contact. By heating and softening it and then slowly closing the mold, the central part of the aspheric fisheye-shaped cavity of the lower mold core will not form a closed cavity.
[0010] Specifically, by increasing the molding temperature in the preheating stage, the surface viscosity of the preform is reduced. After reaching the softening point, the center of the preform will sink first due to the influence of its own weight and contact the center of the lower mold core first, thereby avoiding the formation of a closed gas cavity. After molding, due to the disappearance of the holding pressure, the molded glass lens is affected by the spring elastic force and can be demolded by itself, avoiding the situation where the glass lens is difficult to demold in the lower mold core.
[0011] By adding a positioning retaining ring and a high-temperature spring, combined with the optimization of the molding process, this equipment allows fisheye-type aspheric glass lenses, which can only be processed by single-point turning, to be manufactured using a molding production method. This not only greatly improves production efficiency and reduces production costs, but also greatly improves the surface quality of the glass lens, allowing more optical design engineers to use fisheye-type glass lenses for optical design optimization. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0013] Figure 1 This is the pre-production assembly state of the aspheric fisheye glass lens molding equipment described in the embodiment. Figure I ; Figure 2 for Figure 1 A partial enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the positioning retaining ring structure; Figure 4 The mold closing state after applying pressure for the production of the aspherical fisheye glass lens molding equipment described in the embodiment Figure II ; Figure 5 for Figure 4 A partial enlarged view of point B in the middle; Figure 6 This is the pre-mold opening state of the aspheric fisheye glass lens molding equipment after molding according to the embodiment. Figure III ; Figure 7 The following is a brief flow chart of the molding process of the aspheric fisheye glass lens molding equipment.
[0014] Figure Number: 1-pressure plate; 2-upper die; 3-sleeve; 4-lower die; 5-middle sleeve; 6-preform; 7-positioning retaining ring; 8-high temperature spring; 9-first exhaust hole; 10-second exhaust hole. DETAILED DESCRIPTION
[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0016] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.
[0017] Example 1:
[0018] like Figure 1-6 As shown, this embodiment provides an aspheric fisheye glass lens molding device, including: an inverted convex upper mold core 2 and a lower mold core 4 arranged below the upper mold core 2, an aspheric fisheye-shaped cavity is provided on the top of the lower mold core 4, and a positioning stop ring 7 for fixing the preform 6 is provided between the upper mold core 2 and the lower mold core 4. The positioning stop ring 7 is elastically arranged between the upper mold core 2 and the lower mold core 4 through a plurality of high-temperature springs 8 distributed in a ring shape at the bottom, the bottom of the high-temperature spring 8 is arranged in the top mounting ring groove of the lower mold core 4, and the top of the high-temperature spring 8 is connected to the lower surface of the positioning stop ring 7. During the downward pressing process of the upper mold core 2, the positioning stop ring 7 drives the preform 6 to move downward with the upper mold core 2, and during the upward resetting process of the upper mold core 2, the positioning stop ring 7 drives the preform 6 to move upward with the upper mold core 2.
[0019] Secondly, in this embodiment, the lower stamping section of the upper die core 2 and the upper stamping section of the lower die core 4 are sleeved in the sleeve 3, and the sleeve 3 is provided with multiple first exhaust holes 9, which are used to discharge the air squeezed out during the downward movement of the positioning retaining ring 7.
[0020] Secondly, in this embodiment, the upper mold core 2 and the lower mold core 4 are sleeved in the middle meat sleeve 5, and the middle meat sleeve 5 is located on the periphery of the sleeve 3. At the same time, a second exhaust hole 10 is provided on the middle meat sleeve 5. The air discharged from the first exhaust hole 9 passes through the annular gap between the middle meat sleeve 5 and the sleeve 3 to reach the second exhaust hole 10 for discharge.
[0021] Secondly, in this embodiment, a lower pressing plate 1 is provided on the top of the upper die core 2, and the lower pressing plate 1 is connected to the telescopic end of the press.
[0022] The aspheric fisheye glass lens molding equipment described in the embodiment of the present invention can fix the spherical preform in the center of the mold core by adding a positioning retaining ring and a high-temperature spring, and the elastic force of the high-temperature spring can make the spherical preform suspended above the lower mold core so that they do not make contact. By heating and softening it and then slowly closing the mold, the central part of the aspheric fisheye-shaped cavity of the lower mold core will not form a closed cavity.
[0023] Example 2:
[0024] like Figure 7 As shown, this embodiment is based on embodiment 1 and is used to provide a molding process for an aspherical fisheye glass lens molding device, the molding process comprising: Step S1, assemble and close the upper mold core 2, sleeve 3, lower mold core 4, middle sleeve 5, preform 6, positioning retaining ring 7 and high-temperature spring 8, and then send them into the molding area; Step S2, adjusting the parameters of the molding equipment so that the pressure plate 1 contacts the upper mold core 2 without applying pressure, so as to facilitate better heat transfer during heating; Step S3: Preheat the upper mold core 2 until the surface viscosity of the preform 6 reaches 10^7.6 and maintain this temperature for 30-33 seconds. At this time, the center of the preform 6 begins to sink due to its own gravity, while the sides are blocked by the tapered slope of the positioning retaining ring 7 and cannot sink. Therefore, the center of the lower mold core 4 is able to contact the preform 6 first, avoiding the formation of air cavities. Step S4: Applying a pressure of 0.44-0.47 MPa to the upper mold core 2 through the pressure plate 1 causes the glass preform 6 to slowly extend from the center of the lower mold core 2 toward the edge. At this time, the gas originally existing in the sleeve 3 is discharged through the first exhaust hole 9 and the second exhaust hole 10 during the mold closing process; Step S5: When the pressure plate 1 is pressed to the upper end of the middle sleeve 5, the entire pressing stroke is completed. At this time, the pressure is continuously applied for about 60 seconds, so that the fisheye aspheric glass lens is completely formed; Step S6: Adjust the equipment parameters again to slowly cool the formed fisheye aspheric glass lens. The entire process lasts for 120-130 seconds. Since fisheye aspheric glass lenses are often thick, rapid cooling will form a large concentrated stress inside the glass lens, which may cause breakage. Therefore, slow cooling is required to release the stress inside the glass lens. Step S7: When the temperature drops to about 50°C, the pressure on the pressure plate 1 is removed. At this time, the glass lens is slowly demolded from the lower mold core 4 under the action of the positioning retaining ring 7 and the high-temperature spring 8 to prevent the surface of the glass lens from being in contact with the surface of the lower mold core for a long time, thereby forming a vacuum cavity after complete cooling, which makes demolding difficult; Step S8: Finally, take out the glass lens from the positioning retaining ring 7 and perform relevant specification and size inspection.
[0025] The molding process of the aspheric fisheye glass lens molding equipment described in this embodiment reduces the surface viscosity of the preform by increasing the molding temperature in the preheating stage. After reaching the softening point, the center of the preform will sink first due to the influence of its own weight and contact the center of the lower mold core first, thereby avoiding the formation of a closed gas cavity. After molding, due to the disappearance of the holding pressure, the molded glass lens is affected by the elastic force of the spring and can be demolded by itself, avoiding the situation where the glass lens is difficult to demold in the lower mold core.
[0026] In summary, by adding a positioning retaining ring and a high-temperature spring, combined with the optimization of the molding process, this equipment allows fisheye-type aspheric glass lenses, which can only be processed by single-point turning, to be manufactured using a molding production method. This not only greatly improves production efficiency and reduces production costs, but also greatly improves the surface quality of the glass lens, allowing more optical design engineers to use fisheye-type glass lenses for optical design optimization.
[0027] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. An aspherical fisheye glass lens molding device, characterized in that: include: An inverted convex upper die (2) and a lower die (4) arranged below the upper die (2), the top of the lower die (4) is provided with a non-spherical fisheye-shaped cavity, a positioning stop ring (7) for fixing the preform (6) is provided between the upper die (2) and the lower die (4), the positioning stop ring (7) is elastically arranged between the upper die (2) and the lower die (4) by a plurality of high-temperature springs (8) distributed in an annular shape and arranged at the bottom, the bottom of the high-temperature spring (8) is arranged in the top mounting ring groove of the lower die (4), the top of the high-temperature spring (8) is connected to the lower surface of the positioning stop ring (7), when the upper die (2) is pressed down, the positioning stop ring (7) drives the preform (6) to move downward with the upper die (2), and when the upper die (2) is reset upward, the positioning stop ring (7) drives the preform (6) to move upward with the upper die (2).
2. The aspherical fisheye glass lens molding device according to claim 1, characterized in that: The lower punching section of the upper die (2) and the upper punching section of the lower die (4) are sleeved in a sleeve (3), and the sleeve (3) is provided with a plurality of first exhaust holes (9), which are used to exhaust the air squeezed out during the downward movement of the positioning retaining ring (7).
3. The aspherical fisheye glass lens molding device according to claim 2, characterized in that: The upper mold core (2) and the lower mold core (4) are sleeved in the middle meat sleeve (5), and the middle meat sleeve (5) is located on the periphery of the sleeve (3). At the same time, a second exhaust hole (10) is provided on the middle meat sleeve (5). The air discharged from the first exhaust hole (9) passes through the annular gap between the middle meat sleeve (5) and the sleeve (3) and reaches the second exhaust hole (10) for exhaust.
4. The aspherical fisheye glass lens molding device according to claim 3, characterized in that: A lower pressing plate (1) is provided on the top of the upper die core (2), and the lower pressing plate (1) is connected to the telescopic end of the press.
5. A molding process for the aspherical fisheye glass lens molding equipment according to any one of claims 1 to 4, characterized in that: The molding process includes: The upper mold core (2), sleeve (3), lower mold core (4), middle meat sleeve (5), preform (6), positioning retaining ring (7) and high temperature spring (8) are assembled and molded, and then sent into the molding area; Adjusting the parameters of the molding equipment so that the pressure plate (1) contacts the upper mold core (2) without applying pressure, thereby facilitating better heat transfer during heating; The upper mold core (2) is preheated to make the surface viscosity of the preform (6) reach 10^7.6 and maintain for 30 to 33 seconds. At this time, the preform (6) is affected by its own gravity and the center begins to sink while the two sides are blocked by the conical inclined surface of the positioning retaining ring (7) and cannot sink. Therefore, the center of the lower mold core (4) is able to contact with the preform (6) first to avoid the formation of an air cavity. A pressure of 0.44-0.47 MPa is applied to the upper mold core (2) through the pressure plate (1), so that the 6 glass preforms slowly extend from the center of the lower mold core (2) to the edge. At this time, the gas originally existing in the sleeve (3) will be discharged along the first exhaust hole (9) and the second exhaust hole (10) during the mold closing process; When the pressure plate (1) is pressed to the upper end of the middle meat sleeve (5), the entire pressing stroke is completed. At this time, the pressure is continuously applied for about 60 seconds, so that the shape of the fisheye aspherical glass lens is completely formed; Adjust the equipment parameters again to slowly cool the already formed fisheye aspheric glass lens. The whole process lasts for 120-130 seconds. When the temperature drops to about 50°C, the pressure on the pressure plate (1) is removed, and the glass lens is slowly demoulded from the lower mold core (4) under the action of the positioning retaining ring (7) and the high-temperature spring (8); Finally, remove the glass lens from the 7 positioning retaining ring and conduct relevant specification and size inspection.