A mold for manufacturing an optical lens

Abstract

The utility model relates to optical lens manufacturing technical field, specifically disclose a kind of mould for optical lens manufacturing, comprising: lower die holder, it is the lower part basic supporting component of mould, the vertical verticality of lower die holder upper end surface has locating guide pillar, and locating guide pillar penetrates heat preservation layer and upper die holder, and it is jointly constituted the main mould frame structure of mould;The circular groove of surface array is provided with in lower die holder, and lower die core locating column is arranged in the circular groove.This mould for optical lens manufacturing, the buffer contact piece of locating guide pillar and upper die holder can be used in this mould guide column sleeve, avoid guide column and upper die holder reciprocating friction directly, simultaneously, the fixed gap cooperation of guide column sleeve and guide column can be through the limiting effect of guide column sleeve maintaining cooperation precision, reduce the gap expansion caused by long-term reciprocating motion, and then ensure the coaxiality stability when upper die holder moves along locating guide pillar, make the center deviation of optical lens not expand with the increase of mould use frequency.

Description

Technical Field

[0001] This utility model relates to the field of optical lens manufacturing technology, specifically a mold for manufacturing optical lenses. Background Technology

[0002] In the field of optical lens manufacturing, molds are the core equipment that ensures the optical performance and shape accuracy of lenses. Their design and performance directly determine the yield rate of lenses. Currently, the optical lens molds known in the industry mainly consist of upper and lower mold cores, positioning and guiding components, cooling and temperature control channels, and venting structures. These molds are often used in conjunction with injection molding or thermoforming processes and are suitable for the production of lenses made of different materials such as resin and glass. They are the standard equipment configuration in the current optical manufacturing industry.

[0003] After long-term use, the mating surfaces of the guide pillars and guide sleeves of existing optical lens molds are prone to wear due to long-term reciprocating friction, which leads to an increase in the mating clearance and an increase in the center deviation of the optical lens. In addition, some molds only have annular cooling channels on the outer periphery of the mold core, which can easily cause the temperature of the cavity center and the edge to deviate, resulting in stress concentration in the local area of ​​the lens and making it prone to edge chipping. Utility Model Content

[0004] The purpose of this invention is to provide a mold for manufacturing optical lenses, in order to solve the problems mentioned in the background art, such as the wear caused by long-term reciprocating friction between the guide post and the guide sleeve, which leads to an increase in the mating gap and an increase in the center deviation of the optical lens. In addition, some molds only have annular cooling channels on the outer periphery of the mold core, which can easily cause the temperature of the cavity center and the edge to deviate, resulting in stress concentration in the local area of ​​the lens and the problem of edge chipping.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold for manufacturing optical lenses, including a lower mold base, which is the lower basic support component of the mold. A positioning guide post is vertically erected on the upper surface of the lower mold base, and the positioning guide post penetrates the insulation layer and the upper mold base, together forming the main mold frame structure of the mold. The lower mold base has an array of circular grooves on its surface, and a lower mold core positioning post is placed in the groove. The bottom end of the lower mold core positioning post penetrates the lower mold core outer sleeve and is engaged with the bottom end of the lower mold forming core. The lower mold forming core is embedded in the inner groove of the lower mold core outer sleeve, and the lower mold core outer sleeve penetrates the insulation layer. The upper mold base is penetrated by the upper mold core sleeve, and the upper mold core sleeve is engaged with the upper end face of the lower mold core sleeve. The upper mold core sleeve is embedded with an upper mold forming core, and the inner tube interface of the upper mold forming core is connected to the injection valve. The upper mold forming core and the lower mold forming core are engaged to form a closed cavity for optical lens forming, and the inner tube interface of the upper mold forming core is connected to the closed cavity and the injection valve.

[0006] By adopting the above technical solution, the lower mold forming core is fixed by the lower mold core positioning pin, the upper mold core outer sleeve and the lower mold core outer sleeve are engaged, and the inner tube interface of the upper mold forming core is connected to the cavity and the injection valve, so as to achieve precise positioning of the forming core, sealing and alignment of the cavity and smooth injection, thus ensuring the basic forming accuracy of the lens.

[0007] Preferably, the number of positioning guide pillars and guide pillar sleeves is the same, and the guide pillar sleeves are fitted on the outer wall surface of the positioning guide pillars, with the upper and lower ends of the guide pillar sleeves abutting against the surface of the insulation layer and the upper mold base, respectively.

[0008] By adopting the above technical solution, direct friction between the guide post and the upper mold base is reduced, the mating clearance is kept stable, and the center deviation of the lens is prevented from increasing due to wear.

[0009] Preferably, the connecting end face of the lower mold core sleeve and the upper mold core sleeve is set as a wavy groove, and the bottom end of the upper mold core sleeve is set as a matching wavy protrusion.

[0010] Using the above technical solution, the wavy groove on the outer sleeve of the lower mold core engages with the wavy protrusion on the outer sleeve of the upper mold core, improving the sealing of the cavity and assisting in the precise alignment of the upper and lower molds, reducing alignment deviation.

[0011] Preferably, a cooling pipe is provided inside the lower mold core outer sleeve. The cooling pipe surrounds the center section and edge section of the lower half of the lower mold core forming area, and the pipe port of the cooling pipe penetrates the side wall of the lower mold core outer sleeve.

[0012] Using the above technical solution, the cooling pipe surrounds the center and edge sections of the lower mold forming core, so that the center and edge of the lower mold cavity are cooled synchronously, reducing the cooling deviation and reducing the internal stress concentration on the lower side of the lens.

[0013] Preferably, a second cooling pipe is provided inside the outer sleeve of the upper mold core. The second cooling pipe surrounds the center section and the edge section of the upper half forming part of the upper mold core, and the pipe port of the second cooling pipe penetrates the upper end surface of the outer sleeve of the upper mold core.

[0014] Using the above technical solution, cooling pipe two surrounds the center and edge sections of the upper mold forming core, working in conjunction with cooling pipe one to achieve uniform cooling of the entire cavity, further reducing the internal stress on all sides of the lens and lowering the probability of edge chipping.

[0015] Preferably, a through groove is provided in the wavy protrusion at the bottom of the upper mold core outer sleeve, and the through groove is adapted to the position of the cooling pipe.

[0016] Using the above technical solution, the upper mold core outer sleeve protrusion through groove is adapted to the second cooling pipe, ensuring that the flow of cooling medium is not obstructed by the locking structure, and ensuring the cooling efficiency and uniformity of the upper mold.

[0017] Preferably, the upper end face of the upper mold forming core is threadedly connected to the limiting bolt, and the limiting bolt penetrates through the outer sleeve of the upper mold core.

[0018] By adopting the above technical solution, the position of the upper mold forming core is fixed to prevent displacement, while limiting the mold opening height to prevent the positioning guide post from detaching from the guide post sleeve.

[0019] Compared with the prior art, the beneficial effects of this utility model are: the mold used for manufacturing the optical lens: 1. In this mold, the guide post sleeve can serve as a buffer contact between the positioning guide post and the upper mold base, avoiding direct reciprocating friction between the guide post and the upper mold base. At the same time, the fixed clearance fit between the guide post sleeve and the guide post can maintain the fit accuracy through the limiting effect of the guide post sleeve, reducing the gap expansion caused by long-term reciprocating motion, thereby ensuring the coaxiality stability of the upper mold base when it moves along the positioning guide post, so that the center deviation of the optical lens does not increase with the number of times the mold is used. 2. By arranging the cooling pipes in a ring around the center and edge sections of the molding chamber, the center and edge sections are double-covered, allowing the cooling medium to act directly on the center and edge areas of the cavity. This reduces the difference in cooling rates between the two areas, avoids sudden or slow drops in local temperature within the cavity, reduces the probability of edge chipping due to localized stress concentration during lens molding, and improves the structural integrity of the lens. 3. Furthermore, the wavy interlocking of the lower mold core outer sleeve and the upper mold core outer sleeve enhances the sealing performance of the upper and lower mold core outer sleeves, preventing external temperature from interfering with the cavity during cooling and ensuring uniform cooling. The through groove set in the upper mold core outer sleeve ensures smooth flow of the cooling medium in the cooling pipe, while the limit bolt fixes the position of the upper mold forming core, preventing the forming core from shifting and causing changes in the relative position of the cooling pipe and the cavity, further maintaining cooling accuracy, and also working in conjunction with the positioning function of the guide post sleeve. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of this utility model; Figure 2 This is a schematic diagram of the overall disassembled three-dimensional structure of this utility model; Figure 3 This is a schematic diagram of the overall internal cross-sectional structure of this utility model; Figure 4 This is a schematic diagram of the overall internal side section of the present invention. Figure 5 This is a three-dimensional structural diagram of the internal structure of the upper mold core outer sleeve of this utility model; Figure 6 This is a side-sectional three-dimensional structural diagram of the installation of the lower mold core outer sleeve and the upper mold core outer sleeve of this utility model.

[0021] In the diagram: 1. Lower mold base; 2. Positioning guide post; 3. Insulation layer; 4. Guide post sleeve; 5. Upper mold base; 6. Lower mold core positioning post; 7. Lower mold core outer sleeve; 8. Upper mold core outer sleeve; 9. Lower mold forming core; 10. Cooling pipe one; 11. Cooling pipe two; 12. Upper mold forming core; 13. Injection valve; 14. Limiting bolt. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-6 This utility model provides a technical solution: a mold for manufacturing optical lenses, including a lower mold base 1, a positioning guide post 2, a heat insulation layer 3, a guide post sleeve 4, an upper mold base 5, a lower mold core positioning post 6, a lower mold core outer sleeve 7, an upper mold core outer sleeve 8, a lower mold forming core 9, a cooling pipe one 10, a cooling pipe two 11, an upper mold forming core 12, an injection valve 13, and a limiting bolt 14; Among them, the lower mold base 1 is the lower basic support component of the mold. The upper end face of the lower mold base 1 has a vertical positioning guide post 2, and the positioning guide post 2 penetrates the insulation layer 3 and the upper mold base 5, together forming the main mold frame structure of the mold. The lower mold base 1 has an array of circular grooves on its surface, and a lower mold core positioning post 6 is placed in the groove. The bottom end of the lower mold core positioning post 6 passes through the lower mold core outer sleeve 7 and is engaged with the bottom end of the lower mold forming core 9. The lower mold forming core 9 is embedded in the inner groove of the lower mold core outer sleeve 7, and the lower mold core outer sleeve 7 passes through the insulation layer 3. The number of positioning guide posts 2 and guide post sleeves 4 is the same, and the guide post sleeves 4 are sleeved on the outer wall of the positioning guide posts 2. The upper and lower ends of the guide post sleeves 4 abut against the insulation layer 3 and the surface of the upper mold base 5, respectively. Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, with the lower mold base 1 as the base support, four positioning guide pillars 2 are vertically fixed to the edge of its upper end face. The guide pillar sleeve 4 is correspondingly sleeved on the outer wall of the positioning guide pillar 2. The heat insulation layer 3 passes through the positioning guide pillar 2 and the lower mold core outer sleeve 7, and is horizontally attached to the upper end face of the lower mold base 1, so that the lower end of the guide pillar sleeve 4 abuts against the surface of the heat insulation layer 3, and the upper end is reserved for the fit with the upper mold base 5. Four circular grooves are formed in a rectangular array on the surface of the lower mold base 1. The lower mold core positioning post 6 is fixedly placed in the circular groove. The top of the lower mold core positioning post 6 passes through the reserved hole of the lower mold core outer sleeve 7 and is engaged with the bottom of the lower mold forming core 9 through the slot and buckle structure, so that the lower mold forming core 9 is accurately embedded in the inner groove of the lower mold core outer sleeve 7, ensuring the coaxiality of the lower half forming surface. The upper mold core sleeve 8 passes through the center hole of the upper mold base 5 and is fixed. The upper mold forming core 12 is embedded in the inner groove of the upper mold core sleeve 8, and its internal pipe interface is connected to the injection valve 13 via a threaded connection. Figure 6 As shown, the limiting bolt 14 passes through the outer sleeve 8 of the upper mold core and is threadedly connected to the upper end face of the upper mold forming core 12 to form an upper mold unit that can move as a whole. The upper mold base 5 is penetrated by the upper mold core sleeve 8, and the upper mold core sleeve 8 is engaged with the upper end face of the lower mold core sleeve 7. The connecting end face of the lower mold core sleeve 7 and the upper mold core sleeve 8 is set as a wavy groove, and the bottom end of the upper mold core sleeve 8 is set as a matching wavy protrusion. The lower mold core sleeve 7 is provided with a cooling pipe 10, which surrounds the center section and edge section of the lower half forming part of the lower mold forming core 9, and the pipe port of the cooling pipe 10 penetrates the side wall of the lower mold core sleeve 7. The upper mold core sleeve 8 is provided with a cooling pipe 21, which surrounds the upper half forming part of the upper mold forming core 12. The central section and the edge section, and the pipe port of the cooling pipe 2 11 penetrates the upper end face of the upper mold core sleeve 8. The bottom of the upper mold core sleeve 8 is provided with a through groove in the wavy protrusion. The through groove is adapted to the position of the cooling pipe 2 11. The upper mold core sleeve 8 is embedded with the upper mold forming core 12, and the inner tube interface of the upper mold forming core 12 is connected to the injection valve 13. The upper mold forming core 12 and the lower mold forming core 9 are matched to form a closed cavity for optical lens forming. The inner tube interface of the upper mold forming core 12 is connected to the closed cavity and the injection valve 13. The upper end face of the upper mold forming core 12 is threadedly connected to the limit bolt 14, and the limit bolt 14 penetrates the upper mold core sleeve 8. Referring to the attached diagrams in the instruction manual Figures 1-6 As shown, the upper mold base 5 moves down along the axis of the positioning guide post 2, and the guide post sleeve 4 assists in guiding. When the upper mold base 5 descends to the preset position, the wavy protrusion at the bottom of the upper mold core sleeve 8 precisely engages with the wavy groove on the upper surface of the lower mold core sleeve 7. The upper mold forming core 12 and the lower mold forming core 9 align to form a closed cavity. The external injection molding machine pressurizes and delivers the molten lens material to the injection valve 13. After the injection valve 13 is opened, the material flows into the cavity at a uniform speed along the inner tube interface of the upper mold forming core 12. After the material is filled, the injection valve 13 is closed, and the pressure holding stage begins. The external temperature control system supplies circulating water for cooling to cooling pipe 10 and cooling pipe 21, while the insulation layer 3 reduces heat exchange in the lower mold core outer sleeve 7, and the through groove in the protrusion of the upper mold core outer sleeve 8 provides medium flow space for cooling pipe 21 and assists in heat insulation. After the lens has cooled down, the drive mechanism moves the upper mold base 5 upward along the positioning guide post 2. When it rises to the preset height, the top of the limit bolt 14 abuts against the upper end face of the upper mold core sleeve 8 to prevent the positioning guide post 2 from separating from the guide post sleeve 4. After the upper and lower molds separate, the lens is taken out from the lower mold core sleeve 7. After the part is taken out, the upper mold base 5 moves down to reset and enters the next production cycle.

[0024] Working principle: When using the mold for manufacturing optical lenses, the lower mold base 1 is used as the base, the positioning guide post 2 is vertically fixed at its upper end, the guide post sleeve 4 is fitted onto the positioning guide post 2, the heat insulation layer 3 passes through the positioning guide post 2 and the lower mold core outer sleeve 7 and fits against the lower mold base 1, the lower mold core positioning post 6 is installed in the circular groove of the lower mold base 1, passes through the lower mold core outer sleeve 7 and engages with the lower mold forming core 9, the upper mold core outer sleeve 8 passes through the upper mold base 5 and is fixed, and then the upper mold forming core 12 is embedded in it, the inner tube interface is connected to the injection valve 13, and the limit bolt 14 is connected to the upper mold core outer sleeve 8 and the upper mold forming core 12. By moving the upper mold base 5 down along the positioning guide post 2, the guide post sleeve 4 assists in guiding, the wavy protrusion of the upper mold core outer sleeve 8 engages with the groove of the lower mold core outer sleeve 7, the upper mold forming core 12 and the lower mold forming core 9 are aligned to form a closed cavity, the injection molding machine pressurizes the molten material and sends it into the injection valve 13, and it flows into the cavity through the inner tube interface of the upper mold forming core 12. After the material is full, the valve is closed and pressure is maintained. The external system supplies cooling circulating water to cooling pipe 10 and cooling pipe 21. Since the pipes fit the molding surface, the cavity temperature is reduced. The insulation layer 3 and the upper mold core outer sleeve 8 pass through the groove to assist in heat insulation. After the manufacturing is completed, the upper mold base 5 is moved up, and the limiting bolt 14 is stopped against the upper mold core outer sleeve 8 to prevent the positioning guide post 2 from separating from the guide post sleeve 4. After separation, the part is removed. The lower mold core positioning post 6 fixes the lower mold forming core 9. After the part is removed, the upper mold base 5 is moved down to reset, which increases the overall practicality.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold for manufacturing optical lenses, comprising: The lower mold base (1) is the lower basic support component of the mold. The upper end face of the lower mold base (1) is vertically supported by a positioning guide post (2), and the positioning guide post (2) penetrates the insulation layer (3) and the upper mold base (5), together forming the main mold frame structure of the mold. The feature is that: the surface of the lower mold base (1) is provided with an array of circular grooves, and a lower mold core positioning post (6) is placed in the circular groove, and the bottom end of the lower mold core positioning post (6) penetrates the lower mold core outer sleeve (7) and is engaged with the bottom end of the lower mold forming core (9). The lower mold forming core (9) is embedded in the inner groove of the lower mold core outer sleeve (7), and the lower mold core outer sleeve (7) penetrates the heat insulation layer (3). The upper mold base (5) is penetrated by the upper mold core sleeve (8), and the upper mold core sleeve (8) is engaged with the upper end face of the lower mold core sleeve (7). The upper mold core sleeve (8) is fitted with an upper mold forming core (12), and the inner tube interface of the upper mold forming core (12) is connected to the injection valve (13). The upper mold forming core (12) and the lower mold forming core (9) are engaged to form a closed cavity for optical lens forming, and the inner tube interface of the upper mold forming core (12) is connected to the closed cavity and the injection valve (13).

2. The mold for manufacturing optical lenses according to claim 1, characterized in that: The number of positioning guide pillars (2) and guide pillar sleeves (4) is the same, and the guide pillar sleeves (4) are fitted on the outer wall of the positioning guide pillars (2). The upper and lower ends of the guide pillar sleeves (4) abut against the surfaces of the insulation layer (3) and the upper mold base (5), respectively.

3. The mold for manufacturing optical lenses according to claim 1, characterized in that: The connecting end face of the lower mold core sleeve (7) and the upper mold core sleeve (8) is set as a wavy groove, and the bottom end of the upper mold core sleeve (8) is set as a matching wavy protrusion.

4. The mold for manufacturing optical lenses according to claim 3, characterized in that: The lower mold core outer sleeve (7) is provided with a cooling pipe (10), which surrounds the center section and edge section of the lower half forming part of the lower mold core (9), and the pipe port of the cooling pipe (10) penetrates the side wall of the lower mold core outer sleeve (7).

5. The mold for manufacturing optical lenses according to claim 3, characterized in that: The upper mold core outer sleeve (8) is provided with a second cooling pipe (11). The second cooling pipe (11) surrounds the center section and edge section of the upper half forming part of the upper mold core (12), and the pipe port of the second cooling pipe (11) penetrates the upper end face of the upper mold core outer sleeve (8).

6. The mold for manufacturing optical lenses according to claim 1, characterized in that: The upper mold core outer sleeve (8) has a through groove in the wavy protrusion at the bottom, which is adapted to the position of the cooling pipe (11).

7. The mold for manufacturing optical lenses according to claim 1, characterized in that: The upper end face of the upper mold forming core (12) is threadedly connected to the limiting bolt (14), and the limiting bolt (14) penetrates the outer sleeve (8) of the upper mold core.

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