An ophthalmic lens injection mold structure

Abstract

The utility model discloses a kind of spectacle lens injection mold structures, it is related to spectacle lens production technical field, including: lower die holder and upper die holder, lower die holder upper surface is equipped with runner, runner both sides are equipped with lens forming lower groove, the side of lens forming lower groove deviating runner is equipped with waste groove, this mold structure is equipped with runner by being set in the lower die holder upper surface of mould, runner both sides are set lens forming lower groove, and waste groove is set in the side of lens forming lower groove deviating runner. This design not only realizes the smooth flow of resin material and the effective forming of lens, but also effectively collects waste gas and waste material generated in injection filling process through waste groove, avoids their stay on lens surface, so as to ensure that the quality of lens is reliable and transparent.

Description

Technical Field

[0001] This utility model relates to the field of spectacle lens manufacturing technology, specifically to a spectacle lens injection mold structure. Background Technology

[0002] In the manufacturing process of eyeglass lenses, the design of the injection mold structure is crucial, directly affecting the molding quality, production efficiency, and ease of subsequent processing. Traditional eyeglass lens injection molds have some shortcomings in structural design and functional implementation. For example, the lack of an effective exhaust gas and waste material discharge mechanism within the mold makes the lens surface susceptible to contamination, affecting the lens's transparency and overall quality. Furthermore, traditional molds suffer from insufficient precision in controlling the lens molding dimensions, making it difficult to guarantee the smoothness of the lens edges and the consistency of machining allowances, which inconveniences subsequent precision engraving processes. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a spectacle lens injection mold structure, which solves the problems mentioned in the background section.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a spectacle lens injection mold structure, comprising: a lower mold base and an upper mold base, the upper surface of the lower mold base is provided with a flow channel, the two sides of the flow channel are provided with lens forming grooves, and the side of the lens forming groove away from the flow channel is provided with a waste material groove.

[0005] Furthermore, the waste tank is used to collect waste gas and waste generated during the lens injection molding process, ensuring that waste gas and waste do not remain on the lens surface.

[0006] Furthermore, the upper mold base is provided with an injection hole inside, and the lower surface is provided with a lens forming upper groove that is adapted to the lens forming lower groove. The inner circumference of the lens forming lower groove and the lens forming upper groove is 0.3mm larger than the lens size.

[0007] Furthermore, each lens forming groove is equipped with two lens hole forming protrusions to automatically form lens holes after the lens is formed.

[0008] Furthermore, the four corners of the adjacent end faces of the lower mold base and the upper mold base are provided with alignment grooves and alignment protrusions. The alignment protrusions can slide in the alignment grooves to achieve positioning during the mold closing process.

[0009] Furthermore, the lower mold base has several ejector holes corresponding to the flow channel and waste trough. Each ejector hole has an ejector rod that slides inside, and a sealing head is fixed at the top of the ejector rod for sealing the ejector hole during injection molding.

[0010] This invention provides a structure for an injection mold for eyeglass lenses. Compared with the prior art, it has the following advantages:

[0011] This eyeglass lens injection mold structure features a runner on the upper surface of the lower mold base, lens forming grooves on both sides of the runner, and a waste trough on the side of the lens forming groove opposite to the runner. This design not only ensures smooth resin flow and effective lens forming, but also effectively collects waste gas and waste generated during the injection filling process through the waste trough, preventing them from remaining on the lens surface, thus ensuring reliable lens quality and clarity.

[0012] In addition, by setting an upper lens forming groove on the lower surface of the upper mold base that matches the lower lens forming groove, and ensuring that the inner circumference of the lower and upper lens forming grooves is 0.3mm larger than the lens size, sufficient allowance can be left for subsequent fine carving. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the disassembled structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the lower mold base in this utility model;

[0015] Figure 3 This is a schematic diagram of the upper mold base in this utility model;

[0016] Figure 4 This is a schematic diagram of the assembly structure of this utility model;

[0017] Figure 5 This is a half-sectional view of the assembled version of this utility model;

[0018] Figure 6 This is a structural diagram of the product;

[0019] Figure 7 A top view showing the 0.3mm wide scrap edge formed at the edge of the lens after the product is formed.

[0020] In the diagram: 1. Lower mold base; 11. Runner; 12. Lens forming lower groove; 13. Scrap groove; 14. Lens hole forming protrusion; 15. Alignment groove; 2. Upper mold base; 21. Injection hole; 22. Lens forming upper groove; 23. Alignment protrusion; 3. Ejector rod; 31. Sealing head; 4. Product; 41. Lens; 42. Sprue part; 43. Scrap bag; 44. Lens hole; 45. Scrap edge. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-7 This utility model provides a technical solution: a spectacle lens injection mold structure, including a lower mold base 1 and an upper mold base 2. A flow channel 11 is pre-formed on the upper surface of the lower mold base 1. Lens forming grooves 12 are pre-formed on both sides of the flow channel 11. Scrap grooves 13 are pre-formed on the side of the lens forming grooves 12 away from the flow channel 11. Continuous venting channels are formed on the edges of the lens forming grooves 12 and the scrap grooves 13. The purpose of the scrap grooves 13 is to collect waste gas and waste material generated during the injection molding process of the lens 41, ensuring that waste gas and waste material do not remain on the surface of the lens 41, thus guaranteeing the reliable quality and clarity of the lens 41. The flow channel 11, the lens forming grooves 12, and the scrap grooves 13 are connected. The interior of the upper mold base 2... Injection holes 21 are reserved, and upper lens forming grooves 22 are reserved on the lower surface of the upper mold base 2 at the positions corresponding to the two lower lens forming grooves 12. The lower lens forming grooves 12 and the upper lens forming grooves 22 are compatible, and the inner circumference of the lower lens forming grooves 12 and the upper lens forming grooves 22 is 0.3mm larger than the size of the lens 41. The purpose of this design is to ensure the smoothness of the edge of the lens 41. The circumference of the lens 41 needs to be enlarged, that is, the waste edge 45 formed after the lens 41 is injection molded. In other words, a waste edge 45 is left for subsequent fine carving. Too much allowance will result in sand holes after processing, and too little allowance will result in uneven processing. Through practice, leaving a 0.3mm allowance around the circumference is the most reliable.

[0023] Two lens hole forming protrusions 14 are reserved inside each lens forming groove 12, so that the lens 41 can automatically form lens holes 44 after forming, thereby facilitating the subsequent connection and fixation of the lens 41 to the frame.

[0024] Alignment grooves 15 and alignment protrusions 23 are provided at the four corners of the adjacent end faces of the lower mold base 1 and the upper mold base 2. The alignment grooves 15 and alignment protrusions 23 are matched. During the mold closing process of the lower mold base 1 and the upper mold base 2, the alignment protrusions 23 are located in the alignment grooves 15 and play a positioning role during the mold closing process.

[0025] In addition, several ejector holes are reserved inside the lower mold base 1, and at the positions corresponding to the flow channel 11 and the waste trough 13 respectively. An ejector rod 3 is slidably installed inside each ejector hole, and a sealing head 31 is connected and fixed at the top of each ejector rod 3. The sealing head 31 can seal the ejector hole during the injection molding process.

[0026] During the lens molding process, the resin in the molten state for lens molding is first injected into the runner 11 through the injection hole 21. The resin flows through the runner 11 into the interior of the two lens molding lower grooves 12, filling the entire lower groove 12. Waste gas and waste materials originally located in the runner 11 and lower groove 12 flow into the waste tank 13. Once the runner 11, lower groove 12, and waste tank 13 are all filled, the resin solidifies and the lens is molded. A sprue is then formed in the runner 11. Part 42, lens 41 will be formed in the lens forming groove 12, and waste bag 43 will be formed in the waste trough 13. Since the internal size of the lens forming groove 12 is originally 0.3mm larger than the set size of lens 41, a waste edge 45 with a width of 0.3mm will be formed during the forming process to facilitate subsequent finishing. After the product 4 is fully formed, the mold can be opened. After the mold is opened, the external drive device drives several ejector rods 3 to move upward, pushing the sealing head 31 to move upward synchronously, thereby ejecting the product 4.

Claims

1. A spectacle lens injection mold structure, characterized in that, include: The lower mold base (1) and the upper mold base (2) are provided with a flow channel (11) on the upper surface of the lower mold base (1), and lens forming grooves (12) are provided on both sides of the flow channel (11). A waste groove (13) is provided on the side of the lens forming groove (12) away from the flow channel (11). The upper mold base (2) has an injection hole (21) inside and a lens forming upper groove (22) on the lower surface that is compatible with the lens forming lower groove (12). The size of the inner circumference of the lens forming lower groove (12) and the lens forming upper groove (22) is 0.3 mm larger than the size of the lens (41).

2. The spectacle lens injection mold structure according to claim 1, characterized in that, The waste tank (13) is used to collect the waste gas and waste generated during the injection molding process of the lens (41) to ensure that the waste gas and waste do not remain on the surface of the lens (41).

3. The spectacle lens injection mold structure according to claim 1, characterized in that, Each lens forming groove (12) is provided with two lens hole forming protrusions (14) to automatically form lens holes (44) after the lens (41) is formed.

4. The spectacle lens injection mold structure according to claim 1, characterized in that, Alignment grooves (15) and alignment protrusions (23) are provided at the four corners of the adjacent end faces of the lower mold base (1) and the upper mold base (2). The alignment protrusions (23) can slide in the alignment grooves (15) to achieve positioning during the mold closing process.

5. The spectacle lens injection mold structure according to claim 1, characterized in that, The lower mold base (1) has several ejector holes at the positions corresponding to the flow channel (11) and the waste trough (13). Each ejector hole has an ejector rod (3) that slides inside. The top of the ejector rod (3) is fixed with a sealing head (31) for sealing the ejector hole during the injection molding process.

Images