Lens molding system and molding method thereof

Abstract

The present invention relates to the technical field of optical lens manufacturing, and specifically to a lens molding system and a molding method thereof, including a lens molding mold, a gas pressure control device and a high-pressure gas generating device; the lens molding mold includes a first template and a second template; a lens mold cavity is formed between the first template and the second template; the second template is provided with a flow channel connected to the lens mold cavity; the first template is provided with a pouring gate for communicating with the flow channel; the second template is provided with a gas channel connected to the lens mold cavity; the output end of the high-pressure gas generating device is connected to the gas channel after passing through the gas pressure control device. The present invention controls the gas pressure change in the lens mold cavity to reversely pressurize the melt flow front, increase the pressure of the melt flow front during the molding process, suppress the spring phenomenon of the melt on the upper and lower sides, thereby changing the melt flow direction, thereby achieving the purpose of changing the welding angle of the bonding line to achieve the purpose of eliminating the bonding line.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lens manufacturing, and in particular to a lens molding system and a molding method thereof. Background Art

[0002] In recent years, with the vigorous development of mobile electronics industry such as the smartphone industry, the demand for internal camera lenses has continued to increase, which in turn has driven the development of the optical lens manufacturing industry. The demand for optical lenses continues to increase, and how to improve the production capacity and quality of optical lenses has become an important issue that needs to be solved urgently.

[0003] At present, optical lenses are mainly made of plastic materials. Traditional optical lenses are injection molded by CIM process; Figure 1 as well as Figure 2 As shown in the figure, during the manufacturing process of the lens, since the depth of the middle of the mold cavity is greater than that of the surrounding area (the edge thickness of the product is greater than the center thickness), the flow direction of the melt is as follows: Figure 1 As shown in the figure, when the melts on the upper and lower sides are combined, a structure similar to the following will be formed at the joint. Figure 2 The bonding line greatly affects the quality of the optical lens.

[0004] In the traditional injection molding process, the melt at the flow front in the lens mold cavity can be regarded as a free-flowing state, and the melt pressure at the front is almost zero. The wall thickness of the product directly affects the melt flow direction at the front. Figure 1 As shown. Therefore, the joining line generated during injection molding under the characteristics of the convex and concave structure of optical white lens is inevitable. The current process adjustment method for the joining line of injection molded products is mostly to weaken the visual sense of the joining line by increasing the material temperature, mold temperature, injection pressure and flow rate. The process method used is relatively simple and not very universal, and it is impossible to eliminate the joining line fundamentally. Summary of the invention

[0005] The object of the present invention is to provide a lens molding system and a molding method thereof to address the above-mentioned deficiencies in the prior art, thereby eliminating the bonding line of the lens.

[0006] The object of the present invention is achieved by the following technical solutions: a lens molding system, including a lens molding mold, a gas pressure control device and a high-pressure gas generating device;

[0007] The lens molding mold comprises a first template and a second template; a lens mold cavity is formed between the first template and the second template; the second template is provided with a flow channel communicating with the lens mold cavity; the first template is provided with a pouring gate for communicating with the flow channel; the second template is provided with a gas channel communicating with the lens mold cavity;

[0008] The output end of the high-pressure gas generating device is connected to the gas channel through the gas pressure control device.

[0009] The present invention is further configured such that the gas channel includes a first gas path provided on the second template; the second template is provided with a gas groove; the gas channel also includes a first gas channel formed between the first template and the second template and connected to the lens mold cavity; the gas channel also includes a second gas channel formed between the first template and the gas groove and connected to the first gas path; the first gas channel is connected to the second gas channel;

[0010] The output end of the high-pressure gas generating device is connected to the first gas path through the gas pressure control device.

[0011] The present invention is further configured such that the first template is provided with a first insert; the second template is provided with a second insert; the lens mold cavity is provided between the first insert and the second insert; the air groove is provided at the top of the second insert; the first air channel is provided between the first insert and the second insert; the second air channel is provided between the first insert and the air groove;

[0012] The first air channel is arranged around the lens mold cavity; the second air channel is arranged around the first air channel; the cross-sectional width of the second air channel is greater than the cross-sectional width of the first air channel;

[0013] The first gas path is arranged in the second template; the second template is provided with an air inlet connected to the first gas path; a linear groove is arranged on the top of the second template; the gas channel also includes a second gas path formed between the first template and the linear groove and connected to the first gas path; the second gas path is connected to the first gas path through the second gas path;

[0014] One end of the second gas path is connected to the second air channel; the other end of the second gas path is provided with a first sealing ring; the second template is provided with a sealing groove for placing the first sealing ring;

[0015] The output end of the high-pressure gas generating device is connected to the gas inlet through the gas pressure control device.

[0016] The present invention is further configured such that the second insert is provided with a gate connected to the lens mold cavity; one end of the runner is connected to the gate; the other end of the runner is used to connect to the injection gate; and the gate is provided with a pouring slope.

[0017] The present invention is further configured such that the second template is movably provided with a top plate; the top plate is provided with a first ejector pin and a second ejector pin; one end of the first ejector pin is connected to the top plate; the other end of the first ejector pin is movably provided in the flow channel;

[0018] One end of the second ejector pin is connected to the ejector plate; the other end of the second ejector pin is movably disposed in the lens mold cavity;

[0019] A second sealing ring is provided between the first ejector pin and the second template and between the second ejector pin and the second template;

[0020] The first template is a fixed template; the second template is a movable template;

[0021] The fixed mold is provided with a guide column; the movable mold is provided with a guide groove matched with the guide column.

[0022] The present invention is further configured such that a detection groove connected to the flow channel is provided on the top of the second template; a detection path connected to the detection groove is provided in the second template; and a pressure gauge connected to the detection path is provided in the second template;

[0023] The detection groove includes a first detection groove and a second detection groove; one end of the first detection groove is connected to the flow channel; the other end of the first detection groove is connected to one end of the second detection groove; the other end of the second detection groove is connected to the detection path; the cross-sectional width of the second detection groove is greater than the cross-sectional width of the first detection groove.

[0024] The present invention is further configured such that the high-pressure gas generating device comprises an inert gas supply source and a high-pressure gas storage cylinder; the inert gas supply source is connected to the gas pressure control device via the high-pressure gas storage cylinder; the high-pressure gas storage cylinder is provided with a gas booster;

[0025] The inert gas supply source is provided with nitrogen gas.

[0026] The present invention is further configured such that the gas pressure control device includes a gas pressure regulating valve and a controller for controlling the gas pressure regulating valve; the input end of the gas pressure regulating valve is connected to a high-pressure gas generating device; the output end of the gas pressure regulating valve is connected to a gas channel; and the controller is a single-chip microcomputer.

[0027] A lens molding method comprises the following steps:

[0028] A. Parameter setting step: setting the parameters of the lens molding mold, the parameters of the gas pressure control device and the parameters of the high-pressure gas generating device;

[0029] B. Mold closing step: performing mold closing operation on the first mold plate and the second mold plate;

[0030] C. Pressurization step: by controlling the high-pressure gas generating device and the gas pressure control device, the inert gas enters the lens mold cavity from the gas channel to achieve rapid pressurization of the lens mold cavity gas;

[0031] D. Filling step: When the lens mold cavity gas pressure reaches the set value, the lens mold cavity pressurization will stop, and the melt will be injected through the injection gate and runner at the same time;

[0032] E. Constant pressure step: The lens mold cavity is controlled by a gas pressure control device to maintain a set constant high pressure state through a gas channel;

[0033] F. Pressure holding step: The gas pressure control device sets the pressure holding time and the pressure holding pressure for the gas action to compensate for the defects caused by uneven melt shrinkage;

[0034] G. Pressure relief step: After the gas action is completed and the pressure maintenance is finished, the high-pressure gas in the lens mold cavity is discharged out of the lens mold cavity through the gas channel in the gas pressure control device;

[0035] H. Cooling step: After the pressure relief is completed, the product in the lens mold cavity is cooled;

[0036] I. Mold opening step: Open the first mold and the second mold to eject the product.

[0037] The present invention is further configured such that, in step E, the gas pressure control device maintains a constant high pressure in the lens mold cavity via a pressure-stabilizing valve.

[0038] Beneficial effects of the present invention: The present invention controls the change of gas pressure in the lens mold cavity to apply reverse pressure to the melt flow front, thereby increasing the pressure of the melt flow front during the molding process, suppressing the gushing phenomenon of the melt on the upper and lower sides, thereby changing the melt flow direction, thereby achieving the purpose of changing the welding angle of the bonding line to achieve the purpose of eliminating the bonding line. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0040] Figure 1 This is a diagram of the optical lens molding process using the traditional CIM process;

[0041] Figure 2 It is a schematic diagram of the structure of a traditional optical lens;

[0042] Figure 3 It is a schematic diagram of the structure of the present invention during supercharging;

[0043] Figure 4 It is a schematic diagram of the structure of the present invention when maintaining a constant high pressure;

[0044] Figure 5 It is a structural schematic diagram of the present invention during pressure relief;

[0045] Figure 6 It is a structural schematic diagram of the lens forming mold of the present invention;

[0046] Figure 7 is a structural exploded view of the lens forming mold of the present invention;

[0047] Figure 8 It is a structural schematic diagram of the second template of the present invention;

[0048] Fig. 9 is a schematic structural diagram of the second insert of the present invention;

[0049] Fig.10 is a cross-sectional view of a lens molding mold of the present invention;

[0050] Fig.11 It is a structural exploded view of the cooperation between the first insert and the second insert of the present invention;

[0051] Fig.12 yes Fig.10 A partial enlarged view of the middle A area;

[0052] Fig.13 yes Fig.11 A partial enlarged view of the B area;

[0053] Fig.14 is a diagram of the molding process of the optical lens of the present invention;

[0054] Among them: 1. lens molding mold; 11. first template; 111. injection gate; 112. first insert; 113. guide column; 12. second template; 121. runner; 122. first air path; 123. air inlet; 124. linear groove; 125. second air path; 126. guide groove; 13. lens mold cavity; 141. first air channel; 142. second air channel; 15. second insert; 151. air groove; 152. injection gate; 153. injection ramp; 161. first sealing ring; 162. sealing groove; 17. ejector plate; 171. first ejector pin; 172. second ejector pin; 173. second sealing ring; 181. first detection groove; 182. second detection groove; 183. detection path; 184. pressure gauge;

[0055] 2. Gas pressure control equipment; 21. Gas pressure regulating valve; 22. Controller;

[0056] 3. High-pressure gas generating equipment; 31. Inert gas supply source; 32. High-pressure gas storage cylinder; 33. Gas booster;

[0057] 4. Injection machine nozzle. DETAILED DESCRIPTION

[0058] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant accompanying drawings. Preferred embodiments of the present invention are given in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. It should be noted that when an element is referred to as "fixed to" another element, it can be directly on another element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes.

[0059] Depend on Figures 3 to 12 It can be seen that the lens molding system described in this embodiment includes a lens molding mold 1, a gas pressure control device 2 and a high-pressure gas generating device 3;

[0060] The lens molding mold 1 includes a first mold plate 11 and a second mold plate 12; a lens mold cavity 13 is formed between the first mold plate 11 and the second mold plate 12; the second mold plate 12 is provided with a flow channel 121 communicating with the lens mold cavity 13; the first mold plate 11 is provided with a pouring gate 111 for communicating with the flow channel 121; the second mold plate 12 is provided with a gas channel communicating with the lens mold cavity 13;

[0061] The output end of the high-pressure gas generating device 3 is connected to the gas channel through the gas pressure control device 2 .

[0062] Specifically, the lens molding system described in this embodiment first sets the parameters of the lens molding mold 1, the parameters of the gas pressure control device 2 and the parameters of the high-pressure gas generating device 3 before mold closing; the parameters are the gas pressure and the gas action time and the basic parameter settings required by the traditional injection molding machine; then after the parameter setting is completed, the mold closing process is performed to ensure the sealing and perform the mold closing operation on the first template 11 and the second template 12; then, by controlling the high-pressure gas generating device 3 and the gas pressure control device 2, the inert gas enters the lens mold cavity 13 from the gas channel, so as to realize the rapid pressurization of the gas in the lens mold cavity 13; when the gas fills the lens mold cavity 13, it is directly fed back to the barometer, and when the gas pressure in the lens mold cavity 13 reaches the set value, the pressurization of the lens mold cavity 13 will be stopped, and at the same time The melt is injected through the injection gate 111 and the runner 121; and since the gas in the lens mold cavity 13 is compressed during the melt filling process, the original set gas pressure will gradually increase, and the gas pressure control device 2 controls the lens mold cavity 13 to maintain a set constant high pressure state through the gas channel; the gas pressure control device 2 sets the holding time and the holding pressure for the gas action to compensate for the defect caused by uneven melt shrinkage; when the gas action is completed and the pressure holding is ended, the high-pressure gas in the lens mold cavity 13 is discharged to the outside of the lens mold cavity 13 through the gas channel in the gas pressure control device 2; after the pressure relief is completed, the product in the lens mold cavity 13 is cooled; then the first template 11 and the second template 12 are opened to eject the product.

[0063] This embodiment controls the change of gas pressure in the lens mold cavity 13 to apply reverse pressure to the melt flow front, thereby increasing the pressure of the melt flow front during the molding process, suppressing the gushing phenomenon of the melt on the upper and lower sides, thereby changing the melt flow direction, thereby achieving the purpose of changing the welding angle of the bonding line to achieve the purpose of eliminating the bonding line.

[0064] From the attached Fig.14 It can be seen that the lens molding system described in this embodiment controls the change of gas pressure in the lens mold cavity 13 to apply reverse pressure to the melt flow front, thereby increasing the pressure of the melt flow front during the molding process, suppressing the gushing phenomenon of the melt on the upper and lower sides, thereby changing the melt flow direction, thereby achieving the purpose of changing the welding angle of the bonding line to eliminate the bonding line.

[0065] In the lens molding system described in this embodiment, the gas channel includes a first gas path 122 provided on the second template 12; the second template 12 is provided with a gas groove 151; the gas channel also includes a first gas channel 141 formed between the first template 11 and the second template 12 and connected to the lens mold cavity 13; the gas channel also includes a second gas channel 142 formed between the first template 11 and the gas groove 151 and connected to the first gas path 122; the first gas channel 141 is connected to the second gas channel 142;

[0066] The output end of the high-pressure gas generating device 3 is connected to the first gas path 122 through the gas pressure control device 2 .

[0067] Specifically, the lens molding system described in this embodiment, before mold closing, first allows high-pressure gas to enter from the first gas path 122 through the high-pressure gas generating device 3, and then enters into the lens mold cavity 13 after passing through the second gas channel 142 and the first gas channel 141, so as to achieve rapid pressurization of the gas in the lens mold cavity 13; then the melt enters the runner 121 from the injection gate 111, and flows into the lens mold cavity 13 through the runner 121 to start injection molding; during injection molding, the gas pressure control device 2 controls the high pressure in the lens mold cavity 13, so as to achieve the purpose of eliminating the lens join line; in addition, in terms of the efficiency of rapid pressurization or decompression of the gas in the lens mold cavity 13, in principle, the larger the airway size design, the higher the efficiency, but the risk of cloak or gas mark defects generated at the corresponding airway position of the lens product is higher. In order to ensure a smooth molding process and obtain high-quality products, the present embodiment sets a first air channel 141 and a second air channel 142. Since the through-parting surface area is relatively large, high air pressure will quickly reach the interior of the lens mold cavity 13 through the first air channel 141 and the second air channel 142 before filling. When the melt is filled into the lens mold cavity 13, it is gradually discharged through the slit of the first air channel 141, which plays a self-exhaust role, thereby preventing the formation of cloaks or air marks.

[0068] The present embodiment describes a lens molding system, wherein the first template 11 is provided with a first insert 112; the second template 12 is provided with a second insert 15; the lens mold cavity 13 is provided between the first insert 112 and the second insert 15; the air groove 151 is provided at the top of the second insert 15; the first air duct 141 is provided between the first insert 112 and the second insert 15; the second air duct 142 is provided between the first insert 112 and the air groove 151; specifically, the present embodiment integrates the lens mold cavity 13 and the air groove 151 on the second insert 15, thereby facilitating the user to produce lenses of different shapes by replacing different second inserts 15.

[0069] The first air channel 141 is arranged around the lens mold cavity 13; the second air channel 142 is arranged around the first air channel 141; the cross-sectional width of the second air channel 142 is greater than the cross-sectional width of the first air channel 141; the above arrangement can further prevent the lens from producing cloaks or air marks.

[0070] The first gas path 122 is arranged in the second template 12; the second template 12 is provided with an air inlet 123 connected to the first gas path 122; a linear groove 124 is provided on the top of the second template 12; the gas passage also includes a second gas path 125 formed between the first template 11 and the linear groove 124 and connected to the first gas path 122; the second gas channel 142 is connected to the first gas path 122 through the second gas path 125; the output end of the high-pressure gas generating device 3 is connected to the air inlet 123 after passing through the gas pressure control device 2. Through the above arrangement, the structure of the second template 12 is more compact and reasonable.

[0071] One end of the second air path 125 is connected to the second air channel 142; the other end of the second air path 125 is provided with a first sealing ring 161; the second template 12 is provided with a sealing groove 162 for placing the first sealing ring 161; by providing the first sealing ring 161, air leakage between the second air path 125 and the mold can be prevented.

[0072] In the lens molding system described in this embodiment, the second insert 15 is provided with a gate 152 connected to the lens mold cavity 13; one end of the runner 121 is connected to the gate 152; the other end of the runner 121 is used to communicate with the injection gate 111; the gate 152 is provided with a pouring slope 153. Specifically, by providing the gate 152 on the second insert 15, it is convenient for the melt in the runner 121 to enter the lens mold cavity 13, and by providing the pouring slope 153, the thickness of the residual material after the lens is molded can be reduced.

[0073] In the lens molding system described in this embodiment, the second template 12 is movably provided with a top plate 17; the top plate 17 is provided with a first ejector pin 171 and a second ejector pin 172; one end of the first ejector pin 171 is connected to the top plate 17; the other end of the first ejector pin 171 is movably provided in the flow channel 121; one end of the second ejector pin 172 is connected to the top plate 17; the other end of the second ejector pin 172 is movably provided in the lens mold cavity 13; a second sealing ring 173 is provided between the first ejector pin 171 and the second template 12 and between the second ejector pin 172 and the second template 12;

[0074] Specifically, the first ejector pin 171 is used to eject the residual material after the lens is formed, and the second ejector pin 172 is used to eject the formed lens; the second sealing ring 173 is provided to achieve a sealing effect. .

[0075] The first mold plate 11 is a fixed mold; the second mold plate 12 is a movable mold; the fixed mold is provided with a guide column 113; the movable mold is provided with a guide groove 126 that cooperates with the guide column 113. The guide column 113 and the guide groove 126 facilitate the guiding and positioning of the fixed mold and the movable mold when the mold is closed.

[0076] In the lens molding system described in this embodiment, a detection groove connected to the flow channel 121 is provided on the top of the second template 12; a detection path 183 connected to the detection groove is provided inside the second template 12; and a pressure gauge 184 connected to the detection path 183 is provided in the second template 12. Through the above-mentioned arrangement, the user can observe the air pressure in the lens mold cavity 13 through the pressure gauge 184.

[0077] The detection slot includes a first detection slot 181 and a second detection slot 182; one end of the first detection slot 181 is connected to the flow channel 121; the other end of the first detection slot 181 is connected to one end of the second detection slot 182; the other end of the second detection slot 182 is connected to the detection path 183; the cross-sectional width of the second detection slot 182 is greater than the cross-sectional width of the first detection slot 181. Specifically, the present embodiment can achieve the purpose of preventing glue overflow through the above arrangement.

[0078] In the lens molding system described in this embodiment, the high-pressure gas generating device 3 includes an inert gas supply source 31 and a high-pressure gas storage cylinder 32; the inert gas supply source 31 is connected to the gas pressure control device 2 through the high-pressure gas storage cylinder 32; the high-pressure gas storage cylinder 32 is provided with a gas booster 33;

[0079] The inert gas supply source 31 is provided with nitrogen gas.

[0080] In the lens molding system described in this embodiment, the gas pressure control device 2 includes a gas pressure regulating valve 21 and a controller 22 for controlling the gas pressure regulating valve 21; the input end of the gas pressure regulating valve 21 is connected to the high-pressure gas generating device 3; the output end of the gas pressure regulating valve 21 is connected to the gas channel; the controller 22 is a single-chip microcomputer.

[0081] The lens forming method described in this embodiment includes the following steps:

[0082] A. Parameter setting step: setting the parameters of the lens molding mold 1, the parameters of the gas pressure control device 2 and the parameters of the high-pressure gas generating device 3; the parameters are the gas pressure and gas action time and the basic parameters required by the traditional injection molding machine;

[0083] B. Mold closing step: after the parameter setting is completed, the mold closing process is performed to ensure the sealing and to close the first mold plate 11 and the second mold plate 12;

[0084] C. Pressurization step: by controlling the high-pressure gas generating device 3 and the gas pressure control device 2, the inert gas enters the lens mold cavity 13 from the gas channel, thereby realizing rapid pressurization of the gas in the lens mold cavity 13;

[0085] D. Filling step: When the gas fills the lens mold cavity 13, it is directly fed back to the barometer. When the gas pressure in the lens mold cavity 13 reaches the set value, the lens mold cavity 13 will stop being pressurized. At the same time, the external injection machine nozzle 4 performs the melt injection process through the injection gate 111 and the runner 121;

[0086] E. Constant pressure step: Since the gas in the lens mold cavity 13 is compressed during the melt filling process, the original set gas pressure will gradually increase, and the gas pressure control device 2 controls the lens mold cavity 13 to maintain the set constant high pressure state through the gas channel; when the gas in the lens mold cavity 13 is greater than the set gas, the pressure-stabilizing valve in the gas pressure control device 2 is opened to establish a pressure-stabilizing pipeline channel, and the gas in the lens mold cavity 13 is discharged from the lens mold cavity 13 through the gas channel, the pressure-stabilizing pipeline and the pressure-stabilizing valve. When the pressure in the lens mold cavity 13 drops to the original set range, the gas pressure control device 2 controls the pressure-stabilizing valve to close; and the pressure relief of the lens mold cavity 13 is stopped;

[0087] F. Pressure holding step: The gas pressure control device 2 sets the pressure holding time and the pressure holding pressure for the gas action to compensate for the defects caused by the uneven shrinkage of the melt; since the optical lens requires higher functions and high requirements for appearance and surface accuracy, the V / P pressure of the optical lens that is relatively sensitive to pressure needs to use pressure switching;

[0088] G. Decompression step: After the gas action is completed and the pressure maintenance is finished, the high-pressure gas in the lens mold cavity 13 is decompressed and discharged to the outside of the lens mold cavity 13 through the gas channel in the gas pressure control device 2;

[0089] H. Cooling step: After the pressure relief is completed, the product in the lens mold cavity 13 is cooled;

[0090] I. Mold opening step: Open the first mold plate 11 and the second mold plate 12 to eject the product.

[0091] In step E, the gas pressure control device 2 maintains a constant high pressure in the lens mold cavity 13 through a pressure stabilizing valve.

[0092] From the attached Fig.14 It can be seen that the lens molding method described in this embodiment controls the change of gas pressure in the lens mold cavity 13 to apply reverse pressure to the melt flow front, thereby increasing the pressure of the melt flow front during the molding process, suppressing the gushing phenomenon of the melt on the upper and lower sides, thereby changing the melt flow direction, thereby achieving the purpose of changing the welding angle of the bonding line to achieve the purpose of eliminating the bonding line.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A lens molding system, characterized in that: It comprises a lens forming mold (1), a gas pressure control device (2) and a high-pressure gas generating device (3); The lens molding mold (1) comprises a first mold plate (11) and a second mold plate (12); a lens mold cavity (13) is formed between the first mold plate (11) and the second mold plate (12); the second mold plate (12) is provided with a flow channel (121) communicating with the lens mold cavity (13); the first mold plate (11) is provided with a pouring gate (111) for communicating with the flow channel (121); the second mold plate (12) is provided with a gas channel communicating with the lens mold cavity (13); The output end of the high-pressure gas generating device (3) is connected to the gas channel through the gas pressure control device (2); The gas channel comprises a first gas path (122) provided on the second template (12); the second template (12) is provided with a gas groove (151); the gas channel also comprises a first gas channel (141) formed between the first template (11) and the second template (12) and connected to the lens mold cavity (13); the gas channel also comprises a second gas channel (142) formed between the first template (11) and the gas groove (151) and connected to the first gas path (122); the first gas channel (141) is connected to the second gas channel (142); The output end of the high-pressure gas generating device (3) is connected to the first gas path (122) through the gas pressure control device (2); The first mold plate (11) is provided with a first insert (112); the second mold plate (12) is provided with a second insert (15); the lens mold cavity (13) is provided between the first insert (112) and the second insert (15); the air groove (151) is provided at the top of the second insert (15); the first air channel (141) is provided between the first insert (112) and the second insert (15); the second air channel (142) is provided between the first insert (112) and the air groove (151); The first air channel (141) is arranged around the lens mold cavity (13); the second air channel (142) is arranged around the first air channel (141); the cross-sectional width of the second air channel (142) is greater than the cross-sectional width of the first air channel (141); The first gas path (122) is arranged in the second template (12); the second template (12) is provided with an air inlet (123) connected to the first gas path (122); a linear groove (124) is provided on the top of the second template (12); the gas channel also includes a second gas path (125) formed between the first template (11) and the linear groove (124) and connected to the first gas path (122); the second gas channel (142) is connected to the first gas path (122) through the second gas path (125); One end of the second gas path (125) is in communication with the second gas channel (142); the other end of the second gas path (125) is provided with a first sealing ring (161); the second template (12) is provided with a sealing groove (162) for accommodating the first sealing ring (161); The output end of the high-pressure gas generating device (3) is connected to the gas inlet (123) through the gas pressure control device (2); The second insert (15) is provided with a gate (152) connected to the lens mold cavity (13); one end of the flow channel (121) is connected to the gate (152); the other end of the flow channel (121) is used to communicate with the pouring gate (111); the gate (152) is provided with a pouring slope (153); The gas pressure control device (2) comprises a gas pressure regulating valve (21) and a controller (22) for controlling the gas pressure regulating valve (21); an input end of the gas pressure regulating valve (21) is connected to a high-pressure gas generating device (3); and an output end of the gas pressure regulating valve (21) is connected to a gas channel.

2. A lens molding system according to claim 1, characterized in that: The second template (12) is movably provided with a top plate (17); the top plate (17) is provided with a first ejector pin (171) and a second ejector pin (172); one end of the first ejector pin (171) is connected to the top plate (17); the other end of the first ejector pin (171) is movably provided in the flow channel (121); One end of the second ejector pin (172) is connected to the ejector plate (17); the other end of the second ejector pin (172) is movably disposed in the lens mold cavity (13); A second sealing ring (173) is provided between the first ejector pin (171) and the second template (12), and between the second ejector pin (172) and the second template (12); The first template (11) is a fixed template; the second template (12) is a movable template; The fixed mold is provided with a guide column (113); the movable mold is provided with a guide groove (126) matched with the guide column (113).

3. A lens molding system according to claim 1, characterized in that: A detection groove connected to the flow channel (121) is provided on the top of the second template (12); a detection path (183) connected to the detection groove is provided in the second template (12); a pressure gauge (184) connected to the detection path (183) is provided in the second template (12); The detection groove comprises a first detection groove (181) and a second detection groove (182); one end of the first detection groove (181) is connected to the flow channel (121); the other end of the first detection groove (181) is connected to one end of the second detection groove (182); the other end of the second detection groove (182) is connected to the detection path (183); the cross-sectional width of the second detection groove (182) is greater than the cross-sectional width of the first detection groove (181).

4. A lens molding system according to claim 1, characterized in that: The high-pressure gas generating device (3) comprises an inert gas supply source (31) and a high-pressure gas storage cylinder (32); the inert gas supply source (31) is connected to the gas pressure control device (2) via the high-pressure gas storage cylinder (32); the high-pressure gas storage cylinder (32) is provided with a gas booster (33); The inert gas supply source (31) is provided with nitrogen gas.

5. The lens molding system according to claim 1, characterized in that: The controller (22) is a single chip microcomputer.

6. A lens molding method, characterized in that: The lens molding system comprises any one of claims 1 to 5; and further comprises the following steps: A. Parameter setting step: setting parameters of the lens molding mold (1), parameters of the gas pressure control device (2) and parameters of the high-pressure gas generating device (3); B. Mold closing step: performing mold closing operation on the first mold plate (11) and the second mold plate (12); C. Pressurization step: controlling the high-pressure gas generating device (3) and the gas pressure control device (2) so that the inert gas enters the lens mold cavity (13) from the gas channel, thereby realizing rapid pressurization of the gas in the lens mold cavity (13); D. Filling step: When the gas pressure in the lens mold cavity (13) reaches a set value, the pressurization of the lens mold cavity (13) is stopped, and at the same time, the melt is injected through the injection gate (111) and the runner (121); E. Constant pressure step: controlling the lens mold cavity (13) to maintain a set constant high pressure state through the gas pressure control device (2); F. Holding pressure step: The gas pressure control device (2) sets the holding pressure time and the holding pressure for the gas action to compensate for the defects caused by the uneven shrinkage of the melt; G. Pressure relief step: when the gas action is completed and the pressure maintenance is finished, the high-pressure gas in the lens mold cavity (13) is discharged to the outside of the lens mold cavity (13) through the gas channel in the gas pressure control device (2); H. Cooling step: After the pressure relief is completed, the product in the lens mold cavity (13) is cooled; I. Mold opening step: opening the first mold plate (11) and the second mold plate (12) to eject the product.

7. A lens forming method according to claim 6, characterized in that: In step E, the gas pressure control device (2) maintains a constant high pressure in the lens mold cavity (13) through a pressure-stabilizing valve.

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