Aspherical fish-eye type glass lens molding apparatus

Abstract

The utility model relates to fish eye type aspheric glass lens's mould pressing production manufacturing technical field, especially fish eye type aspheric glass lens mould pressing equipment and mould pressing process of aspheric glass lens, through increasing positioning material blocking ring and high temperature spring, the prefabricated part of spherical surface can be fixed in the center of mould core, and the elastic force of high temperature spring can make the prefabricated part of spherical surface hang in the upper of lower mould core, make it not do contact, after slow mould closing through the softening of warming, the center part of aspheric fish eye type concave cavity of lower mould core will not form closed cavity, through increasing the mould pressing temperature of preheating stage, the surface viscosity of prefabricated part reduces, reaches the softening point, through the influence of dead weight, the center part of prefabricated part will sink first, and the center part of lower mould core contacts first, thereby avoid forming closed gas cavity, after forming, because the pressure -retaining force disappears, the glass lens after forming is influenced by spring elasticity, can be demoulded by oneself, avoided the situation that the glass lens is difficult to demould in lower mould core.

Description

Technical Field

[0001] This utility model relates to the field of molding production technology of fisheye-type aspherical glass lenses, and in particular to a molding equipment for aspherical fisheye-type glass lenses. Background Technology

[0002] Currently, the production of fisheye-type aspherical glass lenses still primarily relies on traditional cold-working single-point turning, which is not only inefficient and costly, but also often leaves noticeable turning marks on the glass lens surface, significantly impacting the final product's usability. Conventional compression molding, limited by the shape of the preform and mold, can cause air blockage during production, preventing the top of the glass lens from being fully compacted and ultimately hindering production. Therefore, a novel production method for fisheye-type aspherical glass lenses has emerged. Utility Model Content

[0003] The purpose of this invention is to provide a molding equipment for aspherical fisheye glass lenses, which solves the technical problem of air blockage during the molding process of existing fisheye aspherical glass lenses.

[0004] The technical solution of this utility model is implemented as follows:

[0005] On one hand, this application provides an aspherical fisheye glass lens molding apparatus, comprising:

[0006] The upper mold core is convex in shape, and the lower mold core is located below the upper mold core. The top of the lower mold core is provided with an aspherical fisheye-shaped cavity. A positioning stop ring for fixing the preform is provided between the upper mold core and the lower mold core. The positioning stop ring is elastically positioned between the upper mold core and the lower mold core by a plurality of high-temperature springs arranged in a ring at the bottom. The bottom of the high-temperature spring is located in the mounting ring groove at the top of the lower mold core, and the top of the high-temperature spring is connected to the lower surface of the positioning stop ring. During the downward pressing of the upper mold core, the positioning stop ring drives the preform to move downward with the upper mold core. During the upward reset of the upper mold core, the positioning stop ring drives the preform to move upward with the upper mold core.

[0007] Optionally, the lower stamping section of the upper die core and the upper stamping section of the lower die core are sleeved inside the sleeve, and the sleeve is provided with a plurality of first vent holes, which are used to discharge the air squeezed out during the downward movement of the positioning stop ring.

[0008] Optionally, the upper mold core and the lower mold core are fitted into the middle mold sleeve, and the middle mold sleeve is located on the periphery of the sleeve. At the same time, the middle mold sleeve is provided with a second vent hole, and the air discharged from the first vent hole reaches the second vent hole through the annular gap between the middle mold sleeve and the sleeve for discharge.

[0009] Optionally, the upper mold core is provided with a lower pressure plate at its top, and the lower pressure plate is connected to the telescopic end of the press.

[0010] On the other hand, this application provides a molding process for an aspherical fisheye glass lens molding apparatus, the molding process comprising:

[0011] The upper mold core, sleeve, lower mold core, middle mold sleeve, preform, positioning stop ring and high temperature spring are assembled and molded, and then sent into the molding area;

[0012] Adjust the parameters of the molding equipment so that the pressure plate contacts the upper mold core but no pressure is applied, which facilitates better heat transfer during heating;

[0013] The upper mold core is preheated to make the surface viscosity of the preform reach 10^7.6 and continue for 30~33s. At this time, the preform is affected by its own gravity, and the center part begins to sink while the two sides are blocked by the conical slope of the positioning stop ring and cannot sink. Therefore, the center part of the lower mold core can contact the preform first to avoid the formation of air cavity.

[0014] A pressure of 0.44-0.47 MPa is applied to the upper mold core by the pressure plate, causing the 6 glass preforms to slowly extend from the center of the lower mold core to the edge. At this time, the gas that was originally in the sleeve will be discharged through the first vent and the second vent during the mold closing process.

[0015] When the pressure plate presses down to the upper part of the middle sleeve, the entire pressing stroke ends. At this time, continue to apply pressure for about 60 seconds to make the fisheye-shaped aspherical glass lens shape fully formed.

[0016] The equipment parameters were readjusted to allow the already formed fisheye-shaped aspherical glass lens to cool down slowly. The whole process lasted 120-130 seconds. Since the thickness of the fisheye-shaped aspherical glass lens is often relatively thick, rapid cooling will create a large concentrated stress inside the glass lens, which may cause it to break. Therefore, it is necessary to cool down slowly to release the stress inside the glass lens.

[0017] Once the temperature drops to around 50°C, the pressure on the pressure plate is released. At this point, the glass lens slowly detaches from the lower mold core under the action of the positioning retaining ring and the high-temperature spring, preventing the surface of the glass lens from being in prolonged contact with the surface of the lower mold core. This would create a vacuum cavity after complete cooling, making demolding difficult. Finally, the glass lens is removed from the positioning retaining ring 7 for relevant dimensional and specification testing.

[0018] The beneficial effects of this utility model are:

[0019] The aspherical fisheye glass lens molding equipment of this utility model, by adding a positioning stop ring and a high-temperature spring, allows the spherical preform to be fixed in the center of the mold core, and the elastic force of the high-temperature spring can suspend the spherical preform above the lower mold core so that they do not come into contact. By heating and softening and then slowly closing the mold, the central part of the aspherical fisheye cavity of the lower mold core will not form a closed cavity.

[0020] Specifically, by increasing the molding temperature during the preheating stage, the surface viscosity of the preform is reduced. Once it reaches the softening point, the center part of the preform will sink first due to its own weight and come into contact with the center of the lower mold core, thus avoiding the formation of a closed gas cavity. After molding, due to the disappearance of the holding pressure, the molded glass lens can be demolded by itself under the influence of the spring force, avoiding the situation where the glass lens is difficult to demold in the lower mold core.

[0021] This equipment, by adding a positioning stop ring and a high-temperature spring, combined with optimized molding process, enables fisheye-shaped aspherical glass lenses, which can only be machined by single-point turning, to be manufactured using molding. This not only greatly improves production efficiency and reduces manufacturing costs, but also significantly improves the surface quality of the glass lenses, allowing more optical design engineers to use fisheye-shaped glass lenses for optical design optimization. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This refers to the pre-production assembly state of the aspherical fisheye glass lens molding equipment described in the embodiment. Figure I ;

[0024] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 3 This is a schematic diagram of the positioning retaining ring structure;

[0026] Figure 4 The mold closing state after applying pressure during the production of the aspherical fisheye glass lens molding equipment described in the embodiment. Figure II ;

[0027] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0028] Figure 6 This refers to the pre-mold opening state after molding using the aspherical fisheye glass lens molding equipment described in the embodiment. Figure III ;

[0029] Figure 7 A simplified flow chart of the molding process for aspherical fisheye glass lens molding equipment.

[0030] Icon labels:

[0031] 1-Pressure plate; 2-Upper mold core; 3-Sleeve; 4-Lower mold core; 5-Middle mold sleeve; 6-Pre-formed part; 7-Positioning stop ring; 8-High temperature spring; 9-First vent hole; 10-Second vent hole. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0033] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Example 1:

[0035] like Figure 1-6 As shown, this embodiment provides an aspherical fisheye glass lens molding device, including: an inverted convex upper mold core 2 and a lower mold core 4 located below the upper mold core 2. The top of the lower mold core 4 is provided with an aspherical fisheye-shaped cavity. A positioning stop ring 7 for fixing a preform 6 is provided between the upper mold core 2 and the lower mold core 4. The positioning stop ring 7 is elastically positioned between the upper mold core 2 and the lower mold core 4 by a plurality of high-temperature springs 8 arranged in a ring at the bottom. The bottom of the high-temperature springs 8 is located in the mounting ring groove at the top of the lower mold core 4, and the top of the high-temperature springs 8 is connected to the lower surface of the positioning stop ring 7. During the pressing down of the upper mold core 2, the positioning stop ring 7 drives the preform 6 to move downward with the upper mold core 2. During the resetting upward of the upper mold core 2, the positioning stop ring 7 drives the preform 6 to move upward with the upper mold core 2.

[0036] Secondly, in this embodiment, the lower stamping section of the upper mold core 2 and the upper stamping section of the lower mold core 4 are sleeved inside the sleeve 3, and the sleeve 3 is provided with a plurality of first exhaust holes 9, which are used to discharge the air squeezed out during the downward movement of the positioning baffle ring 7.

[0037] Secondly, in this embodiment, the upper mold core 2 and the lower mold core 4 are fitted in the middle mold sleeve 5, and the middle mold sleeve 5 is located on the periphery of the sleeve 3. At the same time, the middle mold sleeve 5 is provided with a second vent hole 10. The air discharged from the first vent hole 9 reaches the second vent hole 10 through the annular gap between the middle mold sleeve 5 and the sleeve 3 for discharge.

[0038] Secondly, in this embodiment, the upper mold core 2 is provided with a lower pressure plate 1 at its top, and the lower pressure plate 1 is connected to the telescopic end of the press.

[0039] The aspherical fisheye glass lens molding equipment described in this embodiment, by adding a positioning stop ring and a high-temperature spring, allows the spherical preform to be fixed in the center of the mold core, and the elastic force of the high-temperature spring can suspend the spherical preform above the lower mold core so that they do not come into contact. By heating and softening and then slowly closing the mold, the central part of the aspherical fisheye cavity of the lower mold core will not form a closed cavity.

[0040] Example 2:

[0041] like Figure 7 As shown, this embodiment is based on Embodiment 1 and provides a molding process for an aspherical fisheye glass lens molding equipment. The molding process includes:

[0042] Step S1: Assemble the upper mold core 2, sleeve 3, lower mold core 4, middle mold sleeve 5, preform 6, positioning stop ring 7 and high temperature spring 8 into the mold and then send them into the molding area.

[0043] Step S2: Adjust the parameters of the molding equipment so that the pressure plate 1 contacts the upper mold core 2 but no pressure is applied, which facilitates better heat transfer during heating.

[0044] Step S3: Preheat the upper mold core 2 to make the surface viscosity of the preform 6 reach the level of 10^7.6 and continue for 30~33s. At this time, the preform 6 is affected by its own gravity, and the central part begins to sink while the two sides are blocked by the conical inclined surface of the positioning stop ring 7 and cannot sink. Therefore, the central part of the lower mold core 4 can contact the preform 6 first to avoid the formation of air cavity.

[0045] Step S4: Apply a pressure of 0.44-0.47 MPa 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 that was originally in the sleeve 3 will be discharged through the first vent hole 9 and the second vent hole 10 during the mold closing process.

[0046] Step S5: When the pressure plate 1 presses down to the upper part of the middle meat sleeve 5, the entire pressing stroke ends. At this time, continue to apply pressure for about 60 seconds to make the fish-eye aspherical glass lens shape fully formed.

[0047] Step S6: Adjust the equipment parameters again to slowly cool down the formed fisheye aspherical glass lens. The whole process lasts 120-130 seconds. Since the fisheye aspherical glass lens is often thick, rapid cooling will create a large concentrated stress inside the glass lens, which may cause it to break. Therefore, it is necessary to cool down slowly to release the stress inside the glass lens.

[0048] Step S7: When the temperature drops to about 50°C, release the pressure on the pressure plate 1. At this time, the glass lens will slowly demold from the lower mold core 4 under the action of the positioning baffle 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, so that a vacuum cavity is formed after complete cooling, which would make demolding difficult.

[0049] Step S8: Finally, remove the glass lens from the positioning stop ring 7 and perform relevant specification and size checks.

[0050] The molding process of the aspherical fisheye glass lens molding equipment described in this embodiment increases the molding temperature during the preheating stage, thereby reducing the surface viscosity of the preform. After reaching the softening point, the center part of the preform will sink first due to its own weight and contact the center part of the lower mold core, thus avoiding the formation of a closed gas cavity. After molding, due to the disappearance of the holding pressure, the molded glass lens can be demolded by itself under the influence of the spring force, avoiding the situation where the glass lens is difficult to demold in the lower mold core.

[0051] In summary, by adding a positioning stop ring and a high-temperature spring, and combining this with optimized molding process, the equipment enables fisheye-shaped aspherical glass lenses, which can only be machined by single-point turning, to be manufactured using molding. This not only greatly improves production efficiency and reduces manufacturing costs, but also significantly improves the surface quality of the glass lenses, allowing more optical design engineers to use fisheye-shaped glass lenses for optical design optimization.

[0052] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A molding apparatus for aspherical fisheye glass lenses, characterized in that, include: The upper mold core (2) is convex and the lower mold core (4) is located below the upper mold core (2). The top of the lower mold core (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 mold core (2) and the lower mold core (4). The positioning stop ring (7) is elastically located between the upper mold core (2) and the lower mold core (4) by a plurality of high temperature springs (8) arranged in a ring at the bottom. The bottom of the high temperature springs (8) is located in the mounting ring groove at the top of the lower mold core (4). The top of the high temperature springs (8) is connected to the lower surface of the positioning stop ring (7). During the pressing down of the upper mold core (2), the positioning stop ring (7) drives the preform (6) to move downward with the upper mold core (2). During the resetting upward of the upper mold core (2), the positioning stop ring (7) drives the preform (6) to move upward with the upper mold core (2).

2. The aspherical fisheye glass lens molding equipment according to claim 1, characterized in that, The lower stamping section of the upper mold core (2) and the upper stamping section of the lower mold core (4) are fitted inside the sleeve (3), and the sleeve (3) is provided with multiple first vent holes (9), which are used to discharge the air squeezed out during the downward movement of the positioning baffle ring (7).

3. The aspherical fisheye glass lens molding equipment according to claim 2, characterized in that, The upper mold core (2) and the lower mold core (4) are fitted in the middle mold sleeve (5), and the middle mold sleeve (5) is located on the periphery of the sleeve (3). At the same time, the middle mold sleeve (5) is provided with a second vent hole (10). The air discharged from the first vent hole (9) reaches the second vent hole (10) through the annular gap between the middle mold sleeve (5) and the sleeve (3) and is discharged.

4. The aspherical fisheye glass lens molding equipment according to claim 3, characterized in that, The upper mold core (2) is provided with a lower pressure plate (1) at the top, and the lower pressure plate (1) is connected to the telescopic end of the press.

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