Large-size aspheric biconvex lens injection molding mold and injection steps thereof
The modular mold design with temperature-controlled water routes addresses inefficiencies in producing large aspherical lenses, achieving high yield and transparency through precise volume compensation.
Patent Information
- Application Number
- CN202311859108.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-30
- Publication Date
- 2025-07-15
AI Technical Summary
Current methods for producing large-sized aspherical double convex lenses are inefficient and result in low transparency and high weight for glass, while plastic materials with low softening temperatures lead to low yield and efficiency.
A modular design for a large-sized aspherical double convex lens mold with a high-temperature and low-temperature water route system that compensates for volume shrinkage during injection, ensuring accurate optical surface profiles and high yield.
The solution enhances production efficiency and transparency, enabling mass production of lightweight, cost-effective aspherical double convex lenses with superior mechanical and thermal stability.
Smart Images
Figure CN120307581A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an injection molding die for a large-sized aspherical biconvex lens and an injection step thereof. Background Art
[0002] At present, large-sized aspherical biconvex lenses are formed by glass grinding, with low production efficiency and large weight compared with optical plastics of the same volume. However, the light transmittance of optical PC materials is low, and the softening temperature of PMMA materials cannot meet the requirements, resulting in low light transmittance of the produced aspherical biconvex lenses, low product qualification rate, and low production efficiency. Summary of the Invention
[0003] The object of the present invention is to overcome the deficiencies of the prior art and provide an injection molding die for a large-sized aspherical biconvex lens and an injection step thereof. Through the design of the high-temperature group and low-temperature group of the water channels in the die, the volume shrinkage during the injection of the biconvex lens is reasonably compensated, the aspherical optical surface profile is ensured, the product qualification rate is high, the production efficiency is high, the mass production of large-sized aspherical PMMI biconvex lenses is achieved, and it is lighter and lower in cost compared with the existing glass convex lenses.
[0004] To achieve the above object, the first technical solution of the technical solution of the present invention is realized as follows It is an injection molding die for a large-sized aspherical biconvex lens, which is characterized by comprising: An upper cover, an upper die, a lower die and a base; the lower die is movably installed on the base in the vertical direction. An upper half hole is provided at the bottom of the upper die, and a lower half hole is provided at the top of the lower die. The upper die is installed on the lower die, and the upper half hole and the lower half hole cooperate to form a lens die inner cavity. The upper cover is installed on the upper die; A feed runner group; the feed runner group sequentially passes through the upper cover and the upper die and then communicates with the lens die inner cavity; A first cooling channel and a seventh cooling channel; the first cooling channel and the seventh cooling channel are located in the upper die. The inlets and outlets of the first cooling channel and the seventh cooling channel are respectively communicated with the outside. The water channels of the first cooling channel and the seventh cooling channel respectively pass obliquely above the outside of the lens die inner cavity along the "y" axis direction, and the two water channels are arranged in sequence along the "x" axis; A second cooling channel and a third cooling channel; the second cooling channel and the third cooling channel are located in the upper die. The inlets and outlets of the second cooling channel and the third cooling channel are respectively communicated with the outside. The water channels of the second cooling channel and the third cooling channel respectively pass above the lens die inner cavity along the "x" axis direction, and the two channels are arranged in sequence along the "y" axis A fourth cooling channel; the inlet and outlet of the fourth cooling channel are communicated with the outside. The fourth cooling channel is located in the lower die, and the water channel of the fourth cooling channel horizontally surrounds the lower part of the lens die inner cavity; and The fifth cooling channel and the sixth cooling channel; the inlets and outlets of the fifth cooling channel and the sixth cooling channel are in communication with the outside. The fifth cooling channel and the sixth cooling channel are located in the lower mold. The water channels of the fifth cooling channel and the sixth cooling channel respectively pass along the "y" axis direction below the inner cavity of the lens mold, and these two channels are arranged in sequence along the "x" axis.
[0005] In this technical solution, it also includes positioning columns and springs. The positioning columns are installed on the base. The lower mold is sleeved on the positioning columns and can move longitudinally along the positioning columns. The springs are sleeved on the positioning columns, and the two ends of the springs respectively abut against the base and the lower mold.
[0006] In this technical solution, the feed channel group includes a feed inlet. A first feed channel is provided in the upper mold, and a second feed channel is provided in the lower mold. The feed inlet is installed on the upper cover, and the feed inlet, the first feed channel, the second feed channel, and the inner cavity of the lens mold are sequentially communicated.
[0007] In this technical solution, one or more slag pocket cold wells are provided on the rear mold of the inner cavity of the lens mold.
[0008] In order to achieve the above object, the second technical solution of the technical solution of the present invention is implemented as follows. It is the injection step of a large-size aspherical biconvex lens injection molding mold, and it is characterized by including the following steps: Step 1 Inject hot water at 140 °C into the second cooling channel, the third cooling channel, the fifth cooling channel, and the sixth cooling channel, and inject hot water at 120 °C into the first cooling channel, the seventh cooling channel, and the fourth cooling channel; Step 2 Inject materials through the feed channel group. In the first stage, inject materials at a speed of 2 mm / s for 4.5 seconds, and the injection volume accounts for 10% of the weight of the workpiece; in the second stage, inject materials at a speed of 1.8 mm / s for 6.7 seconds, and the injection volume accounts for 13% of the weight of the workpiece; in the third stage, inject materials at a speed of 20 mm / s for 1.1 seconds, and the injection volume accounts for 19% of the weight of the workpiece; in the fourth stage, inject materials at a speed of 15 mm / s for 0.3 seconds, and the injection volume accounts for 4% of the weight of the workpiece; in the fifth stage, inject materials at a speed of 12 mm / s for 1.2 seconds, and the injection volume accounts for 16% of the weight of the workpiece; in the sixth stage, inject materials at a speed of 10 mm / s for 1.2 seconds, and the injection volume accounts for 13% of the weight of the workpiece; in the seventh stage, inject materials at a speed of 8 mm / s for 1.3 seconds, and the injection volume accounts for 11% of the weight of the workpiece; in the eighth stage, inject materials at a speed of 6 mm / s for 1.7 seconds, and the injection volume accounts for 11% of the weight of the workpiece; in the ninth stage, finally, after the injection material cools, supplement the compensation material from the feed channel, and the compensation material accounts for 2% of the weight of the workpiece.
[0009] In this technical solution, it further includes positioning columns and springs. The positioning columns are installed on the base. The lower mold is sleeved on the positioning columns and can move longitudinally along the positioning columns. The springs are sleeved on the positioning columns, and the two ends of the springs respectively abut against the base and the lower mold.
[0010] In this technical solution, the feeding runner group includes a feeding port. A first feeding runner is provided in the upper mold, and a second feeding runner is provided in the lower mold. The feeding port is installed on the upper cover, and the feeding port, the first feeding runner, the second feeding runner and the inner cavity of the lens mold are sequentially communicated.
[0011] In this technical solution, one or more slag pocket cold material wells are provided on the rear mold in the inner cavity of the lens mold.
[0012] The advantages of the present invention compared with the prior art are as follows: Through the design of the high-temperature group and the low-temperature group of the water channels in the mold, the volume shrinkage of the injection double convex lens is reasonably compensated, ensuring the aspherical optical surface profile, with high product qualification rate and high production efficiency. The mass production of injection large-size aspherical PMMI double convex lenses is realized, which is lighter and lower in cost compared with the existing glass convex lenses. Description of the Drawings
[0013] Figure 1 is a perspective view of the present invention; Figure 2 is a top view of the present invention; Figure 3 is Figure 2 the A-A cross-sectional view of Figure 4 is Figure 2 the B-B cross-sectional view of Figure 5 is Figure 2 the C-C cross-sectional view of Figure 6 is Figure 2 the D-D cross-sectional view of Figure 7 is a side view of the present invention; Figure 8 is Figure 7 the E-E cross-sectional view of Figure 9 is Figure 7 the F-O-F cross-sectional perspective view of Figure 10 is a schematic structural view of the present invention after being sectioned along the fifth cooling channel; Figure 11 is a schematic structural view of the present invention after being sectioned along the sixth cooling channel; Figure 12 is the water channel schematic diagram of the present invention; Figure 13It is a schematic structural diagram of the lower mold and the base of the present invention. Embodiment
[0014] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation on the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Embodiment 1
[0015] As Figures 1 to 13 shown, it is an injection molding mold for a large-size aspherical biconvex lens, including: Upper cover 1, upper mold 3, lower mold 4 and base 5; the lower mold 4 is movably installed on the base 5 up and down. There is an upper half hole at the bottom of the upper mold 3, and a lower half hole at the top of the lower mold 4. The upper mold 3 is installed on the lower mold 4, and the upper half hole and the lower half hole cooperate to form a lens mold cavity 34. The upper cover 1 is installed on the upper mold 3; Feeding runner group; the feeding runner group sequentially passes through the upper cover 1 and the upper mold 3 and then communicates with the lens mold cavity 34; First cooling runner 7 and seventh cooling runner 14; the first cooling runner 7 and the seventh cooling runner 14 are located in the upper mold 3. The inlets and outlets of the first cooling runner 7 and the seventh cooling runner (4) communicate with the outside respectively. The water channels of the first cooling runner 7 and the seventh cooling runner 14 pass obliquely above the outside of the lens mold cavity 34 along the "y" axis direction, and the two water channels are arranged in sequence along the "x" axis; Second cooling runner 8 and third cooling runner 9; the second cooling runner 8 and the third cooling runner 9 are located in the upper mold 3. The inlets and outlets of the second cooling runner 8 and the third cooling runner 9 communicate with the outside respectively. The water channels of the second cooling runner 8 and the third cooling runner 9 pass above the lens mold cavity 34 along the "x" axis direction, and the two runners are arranged in sequence along the "y" axis Fourth cooling runner 10; the inlet and outlet of the fourth cooling runner 10 communicate with the outside. The fourth cooling runner is located in the lower mold 4. The water channel of the fourth cooling runner 10 horizontally surrounds the lower part of the lens mold cavity 34; and Fifth cooling runner 11 and sixth cooling runner 13; the inlets and outlets of the fifth cooling runner 11 and the sixth cooling runner 13 communicate with the outside. The fifth cooling runner 11 and the sixth cooling runner 13 are located in the lower mold 4. The water channels of the fifth cooling runner 11 and the sixth cooling runner 13 pass along the "y" axis direction below the lens mold cavity 34, and the two runners are arranged in sequence along the "x" axis.
[0016] During operation, Step 1 Inject hot water at 140°C into the second cooling channel, the third cooling channel, the fifth cooling channel and the sixth cooling channel, and inject hot water at 120°C into the first cooling channel, the seventh cooling channel and the fourth cooling channel; Step 2 Inject materials through the feed channel group. In the first stage, inject materials at a speed of 2 mm / s for 4.5 seconds, and the injection volume accounts for 10% of the weight of the workpiece; in the second stage, inject materials at a speed of 1.8 mm / s for 6.7 seconds, and the injection volume accounts for 13% of the weight of the workpiece; in the third stage, inject materials at a speed of 20 mm / s for 1.1 seconds, and the injection volume accounts for 19% of the weight of the workpiece; in the fourth stage, inject materials at a speed of 15 mm / s for 0.3 seconds, and the injection volume accounts for 4% of the weight of the workpiece; in the fifth stage, inject materials at a speed of 12 mm / s for 1.2 seconds, and the injection volume accounts for 16% of the weight of the workpiece; in the sixth stage, inject materials at a speed of 10 mm / s for 1.2 seconds, and the injection volume accounts for 13% of the weight of the workpiece; in the seventh stage, inject materials at a speed of 8 mm / s for 1.3 seconds, and the injection volume accounts for 11% of the weight of the workpiece; in the eighth stage, inject materials at a speed of 6 mm / s for 1.7 seconds, and the injection volume accounts for 11% of the weight of the workpiece; in the ninth stage, finally, after the injection material cools, supplement the compensation material from the feed channel, and the compensation material accounts for 2% of the weight of the workpiece.
[0017] With the cooperation of two groups of water channels with different temperatures, the temperature generated by the water channels reasonably compensates for the volume shrinkage of the injection double convex lens, ensures the aspherical optical surface profile, enables the mass production of the aspherical PMMI double convex lens, and the PMMI has excellent performance, with superior mechanical properties, heat resistance stability, radiation resistance, etc., and can be applied to various fields, such as the aviation field, etc.
[0018] In this embodiment, it further includes a positioning post 6 and a spring 12. The positioning post 6 is installed on the base 5. The lower mold 4 is sleeved on the positioning post 6 and can move longitudinally along the positioning post 6. The spring 12 is sleeved on the positioning post 6, and both ends of the spring 12 respectively abut against the base 5 and the lower mold 4.
[0019] In this embodiment, the feed channel group includes a feed port 2. A first feed channel 31 is provided in the upper mold 3, and a second feed channel 41 is provided in the lower mold 4. The feed port 2 is installed on the upper cover 1, and the feed port 2, the first feed channel 31, the second feed channel 41 and the lens mold cavity 34 are connected in sequence.
[0020] In this embodiment, one or more slag pocket holes 341 are provided on the side of the lens mold cavity 34. Embodiment 2
[0021] As Figures 1 to 13 shown, it is an injection step of an injection molding mold for a large-size aspherical double convex lens, including the following steps: Step 1 Inject hot water at 140°C into the second cooling channel 8, the third cooling channel 9, the fifth cooling channel 11, and the sixth cooling channel 13, and inject hot water at 120°C into the first cooling channel 7, the seventh cooling channel 14, and the fourth cooling channel Step 2 Inject materials through the feed channel group. In the first stage, inject materials at a speed of 2 mm / s for 4.5 seconds, and the injection volume accounts for 10% of the weight of the workpiece. In the second stage, inject materials at a speed of 1.8 mm / s for 6.7 seconds, and the injection volume accounts for 13% of the weight of the workpiece. In the third stage, inject materials at a speed of 20 mm / s for 1.1 seconds, and the injection volume accounts for 19% of the weight of the workpiece. In the fourth stage, inject materials at a speed of 15 mm / s for 0.3 seconds, and the injection volume accounts for 4% of the weight of the workpiece. In the fifth stage, inject materials at a speed of 12 mm / s for 1.2 seconds, and the injection volume accounts for 16% of the weight of the workpiece. In the sixth stage, inject materials at a speed of 10 mm / s for 1.2 seconds, and the injection volume accounts for 13% of the weight of the workpiece. In the seventh stage, inject materials at a speed of 8 mm / s for 1.3 seconds, and the injection volume accounts for 11% of the weight of the workpiece. In the eighth stage, inject materials at a speed of 6 mm / s for 1.7 seconds, and the injection volume accounts for 11% of the weight of the workpiece. In the ninth stage, finally, after the injection material cools, supplement the compensation material from the feed channel, and the compensation material accounts for 2% of the weight of the workpiece.
[0022] During operation, its mold structure is as follows: Upper cover 1, upper mold 3, lower mold 4, and base 5; the lower mold 4 is movably installed on the base 5. There is an upper half hole at the bottom of the upper mold 3, and a lower half hole at the top of the lower mold 4. The upper mold 3 is installed on the lower mold 4, and the upper half hole and the lower half hole cooperate to form the lens mold inner cavity 34. The upper cover 1 is installed on the upper mold 3; Feed channel group; the feed channel group sequentially passes through the upper cover 1 and the upper mold 3 and then communicates with the lens mold inner cavity 34; First cooling channel 7 and seventh cooling channel 14; the first cooling channel 7 and the seventh cooling channel 14 are located in the upper mold 3. The inlets and outlets of the first cooling channel 7 and the seventh cooling channel 14 are respectively connected to the outside. The water channels of the first cooling channel 7 and the seventh cooling channel 14 respectively pass along the outer side of the lens mold inner cavity 34 obliquely upward in the "y" axis direction, and the two water channels are arranged in sequence along the "x" axis; Second cooling channel 8 and third cooling channel 9; the second cooling channel 8 and the third cooling channel 9 are located in the upper mold 3. The inlets and outlets of the second cooling channel 8 and the third cooling channel 9 are respectively connected to the outside. The water channels of the second cooling channel 8 and the third cooling channel 9 respectively pass along the upper part of the lens mold inner cavity 34 in the "x" axis direction, and the two channels are arranged in sequence along the "y" axis The fourth cooling channel 10; the inlet and outlet of the fourth cooling channel 10 are in communication with the outside world. The fourth cooling channel is located in the lower mold 4, and the water channel of the fourth cooling channel 10 horizontally surrounds the lower part of the inner cavity 34 of the lens mold; and The fifth cooling channel 11 and the sixth cooling channel 13; the inlets and outlets of the fifth cooling channel 11 and the sixth cooling channel 13 are in communication with the outside world. The fifth cooling channel 11 and the sixth cooling channel 13 are located in the lower mold 4. The water channels of the fifth cooling channel 11 and the sixth cooling channel 13 respectively pass along the "y" axis direction under the inner cavity 34 of the lens mold, and these two channels are arranged in sequence along the "x" axis.
[0023] In this embodiment, it further includes a positioning post 6 and a spring 12. The positioning post 6 is installed on the base 5. The lower mold 4 is sleeved on the positioning post 6 and can move longitudinally along the positioning post 6. The spring 12 is sleeved on the positioning post 6, and the two ends of the spring 12 respectively abut against the base 5 and the lower mold 4.
[0024] In this embodiment, the feed channel group includes a feed port 2. A first feed channel 31 is provided in the upper mold 3, and a second feed channel 41 is provided in the lower mold 4. The feed port 2 is installed on the upper cover 1, and the feed port 2, the first feed channel 31, the second feed channel 41 and the inner cavity 34 of the lens mold are sequentially communicated.
[0025] The above has made a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those of ordinary skill in the art, various changes, modifications, substitutions and deformations of these embodiments still fall within the protection scope of the present invention without departing from the principles and purposes of the present invention.
Claims
1. An injection molding die for a large-sized aspherical biconvex lens and its injection steps, characterized in that Including: An upper cover (1), an upper mold (3), a lower mold (4) and a base (5); the lower mold (4) is movably installed on the base (5) up and down. An upper semi-hole is provided at the bottom of the upper mold (3), and a lower semi-hole is provided at the top of the lower mold (4). The upper mold (3) is installed on the lower mold (4), and the upper semi-hole and the lower semi-hole cooperate to form a lens mold inner cavity (34). The upper cover (1) is installed on the upper mold (3); A feed runner group; the feed runner group sequentially passes through the upper cover (1) and the upper mold (3) and then communicates with the lens mold inner cavity (34); A first cooling runner (7) and a seventh cooling runner (14); the first cooling runner (7) and the seventh cooling runner (14) are located in the upper mold (3). The inlets and outlets of the first cooling runner (7) and the seventh cooling runner (14) are respectively communicated with the outside. The water channels of the first cooling runner (7) and the seventh cooling runner (14) respectively pass obliquely above the outside of the lens mold inner cavity (34) along the "y" axis direction, and the two water channels are arranged in sequence along the "x" axis; A second cooling runner (8) and a third cooling runner (9); the second cooling runner (8) and the third cooling runner (9) are located in the upper mold (3). The inlets and outlets of the second cooling runner (8) and the third cooling runner (9) are respectively communicated with the outside. The water channels of the second cooling runner (8) and the third cooling runner (9) respectively pass above the lens mold inner cavity (34) along the "x" axis direction, and the two runners are arranged in sequence along the "y" axis A fourth cooling runner (10); the inlet and outlet of the fourth cooling runner (10) are communicated with the outside. The fourth cooling runner is located in the lower mold (4). The water channel of the fourth cooling runner (10) horizontally surrounds the lower part of the lens mold inner cavity (34); and A fifth cooling runner (11) and a sixth cooling runner (13); the inlets and outlets of the fifth cooling runner (11) and the sixth cooling runner (13) are communicated with the outside. The fifth cooling runner (11) and the sixth cooling runner (13) are located in the lower mold (4). The water channels of the fifth cooling runner (11) and the sixth cooling runner (13) respectively pass through the lower part of the lens mold inner cavity (34) along the "y" axis direction, and the two runners are arranged in sequence along the "x" axis.
2. The injection molding die for a large-sized aspherical biconvex lens according to claim 1, characterized in that It further includes a positioning post (6) and a spring (12). The positioning post (6) is installed on the base (5). The lower mold (4) is sleeved on the positioning post (6) and can longitudinally move along the positioning post (6). The spring (12) is sleeved on the positioning post (6), and the two ends of the spring (12) respectively abut against the base (5) and the lower mold (4).
3. The injection molding die for large-sized aspherical biconvex lenses according to claim 1, characterized in that The feed runner group includes a feed inlet (2). A first feed runner (31) is provided in the upper mold (3), and a second feed runner (41) is provided in the lower mold (4). The feed inlet (2) is installed on the upper cover (1), and the feed inlet (2), the first feed runner (31), the second feed runner (41) and the lens mold inner cavity (34) are sequentially communicated.
4. The injection molding die for a large-sized aspherical biconvex lens according to claim 1, characterized in that One or more slag pocket holes (341) are provided on the side of the lens mold inner cavity (34).
5. The injection step of the injection molding die for a large-size aspherical biconvex lens according to claim 1, characterized in that It includes the following steps: Step 1 Inject hot water at 140°C into the second cooling channel (8), the third cooling channel (9), the fifth cooling channel (11), and the sixth cooling channel (13), and inject hot water at 120°C into the first cooling channel (7), the seventh cooling channel (14), and the fourth cooling channel. Step 2 Inject materials through the feed channel group. In the first stage, inject materials at a speed of 2 mm / s for 4.5 seconds, and the injection volume accounts for 10% of the weight of the workpiece; in the second stage, inject materials at a speed of 1.8 mm / s for 6.7 seconds, and the injection volume accounts for 13% of the weight of the workpiece; in the third stage, inject materials at a speed of 20 mm / s for 1.1 seconds, and the injection volume accounts for 19% of the weight of the workpiece; in the fourth stage, inject materials at a speed of 15 mm / s for 0.3 seconds, and the injection volume accounts for 4% of the weight of the workpiece; in the fifth stage, inject materials at a speed of 12 mm / s for 1.2 seconds, and the injection volume accounts for 16% of the weight of the workpiece; in the sixth stage, inject materials at a speed of 10 mm / s for 1.2 seconds, and the injection volume accounts for 13% of the weight of the workpiece; in the seventh stage, inject materials at a speed of 8 mm / s for 1.3 seconds, and the injection volume accounts for 11% of the weight of the workpiece; in the eighth stage, inject materials at a speed of 6 mm / s for 1.7 seconds, and the injection volume accounts for 11% of the weight of the workpiece; in the ninth stage, finally, after the injection material cools, supplement compensating material from the feed channel, and the compensating material accounts for 2% of the weight of the workpiece.
6. The injection step of the injection molding die for a large-sized aspherical biconvex lens according to claim 5, characterized in that It also includes a positioning post (6) and a spring (12). The positioning post (6) is installed on the base (5), the lower mold (4) is sleeved on the positioning post (6) and can move longitudinally along the positioning post (6), and the spring (12) is sleeved on the positioning post (6), with both ends of the spring (12) abutted against the base (5) and the lower mold (4) respectively.
7. The injection step of the injection molding die for a large-sized aspherical biconvex lens according to claim 5, characterized in that The feed channel group includes a feed port (2). A first feed channel (31) is provided in the upper mold (3), and a second feed channel (41) is provided in the lower mold (4). The feed port (2) is installed on the upper cover (1), and the feed port (2), the first feed channel (31), the second feed channel (41), and the lens mold cavity (34) are connected in sequence.
8. The injection step of the injection molding die for large-size aspherical biconvex lenses according to claim 5, characterized in that One or more slag pocket holes (341) are provided on the side of the lens mold cavity (34).