CN211917474U

CN211917474U - Mould pressing mould core of optical plastic lens

Info

Publication number: CN211917474U
Application number: CN202020474362.5U
Authority: CN
Inventors: 徐能佳; 汪正国; 露木直树; 袁超; 危远志
Original assignee: Dongguan Harmony Optical Technology Co ltd
Current assignee: Dongguan Harmony Optical Technology Co ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-11-13
Anticipated expiration: 2030-04-03

Abstract

A mold insert for molding an optical plastic lens, comprising: main part (1), aspheric surface head (2) and nickel layer (3), the upper end in main part (1) is fixed in aspheric surface head (2), and the upper surface of aspheric surface head (2) is covered in nickel layer (3), and the upper surface of aspheric surface head (2) has aspheric surface (21), and main part (1) is formed by steel, and aspheric surface head (2) are formed by glass. The mould pressing mould core is manufactured in a mould pressing mode, has reproducibility, does not need to be processed through aspheric surface ultra-precision processing equipment any more, greatly reduces the manufacturing cost and greatly improves the manufacturing efficiency. In addition, the Rockwell hardness of the glass is 58-64, which is higher than the hardness of steel and a nickel layer, so that the deformation is not easy to occur in the lens mould pressing process, and the forming size precision of the lens is favorably ensured.

Description

Mould pressing mould core of optical plastic lens

Technical Field

The present invention relates to a mold insert, and more particularly to a mold insert for an optical plastic lens.

Background

Optical lenses are mostly formed of glass or plastic, and molding methods are mostly used for molding. For optical glass lenses, the processing method comprises the steps of heating a glass material to 500-700 ℃ for softening, then pressurizing and molding the glass lens in a mold, wherein a high-precision aspheric tungsten steel mold core plated with a diamond-like carbon film layer is arranged in the mold, and the aspheric surface shape of the diamond-like carbon film layer is copied onto the glass in the pressurizing process; the processing method of the optical plastic lens is that the optical plastic is heated and softened at the temperature of 200-250 ℃, then the plastic lens is formed by pressurizing in a mold, a high-precision aspheric mold steel mold core with a nickel coating is arranged in the mold, and the aspheric surface shape of the nickel coating is copied to the plastic in the pressurizing process.

At present, the molding die core of the optical plastic lens is mainly manufactured by plating a nickel layer with the thickness of 0.2-0.25 mm on the surface of die steel and then performing surface finish machining on the nickel layer by using a single-point diamond cutter.

However, the nickel layer is required to have a smooth surface and an ultra-precise surface, and on one hand, the smoothness and precision requirements restrict the improvement of the processing efficiency and cannot meet the requirement of rapid mass production; on the other hand, in order to meet the requirements, a plurality of imported ultra-precision processing devices are needed, so that the cost and the burden of enterprises are increased, the selling price of the product is improved, and the market competitiveness is reduced. In addition, the hardness of steel and nickel layers is relatively low, and the finish machining is convenient, but the deformation is easy to occur in the lens molding process, so that the molding size precision of the lens is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses technical scheme is to above-mentioned condition, and in order to solve above-mentioned problem and provide a mould pressing mould benevolence of optics plastics lens, mould pressing mould benevolence includes: main part, aspheric surface head and nickel layer, the aspheric surface head is fixed the upper end of main part, the nickel layer covers the upper surface of aspheric surface head, the upper surface of aspheric surface head has the aspheric surface, the main part is formed by steel, the aspheric surface head is formed by glass.

Further, the body includes: base, guide post and shaping post, the base the guide post with it is fixed from up forming in proper order down to become the shaping post, the width of base is greater than the width of guide post, the width of guide post is greater than the width of shaping post, the aspheric surface head is fixed the upper end of shaping post.

Furthermore, the upper surface of the aspheric surface head is also provided with a positioning groove and a convex ring, the positioning groove is arranged around the aspheric surface, and the convex ring is positioned at the edge of the aspheric surface head.

Further, the thickness of the nickel layer is 0.2-0.25 mm.

After the technical scheme is adopted, the utility model discloses an effect is: the mould pressing mould core is manufactured in a mould pressing mode, has reproducibility, does not need to be processed through aspheric surface ultra-precision processing equipment any more, greatly reduces the manufacturing cost and greatly improves the manufacturing efficiency. In addition, the Rockwell hardness of the glass is 58-64, which is higher than the hardness of steel and a nickel layer, so that the deformation is not easy to occur in the lens mould pressing process, and the forming size precision of the lens is favorably ensured.

Drawings

FIG. 1 is a schematic view of a molding die insert according to the present invention;

fig. 2 is a cross-sectional view of an aspheric head according to the present invention;

fig. 3 is a flowchart of a manufacturing method according to the present invention.

Detailed Description

It is specifically noted that the terms "first", "second" and "third" in the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. All directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture, and if the specific posture is changed, the directional indicator is changed accordingly.

The technical solution of the present invention is further described below by way of examples:

the utility model provides a mould pressing mould benevolence of optics plastics lens, it is shown with fig. 2 to combine, and mould pressing mould benevolence includes: main part 1, aspherical head 2 and nickel layer 3, aspherical head 2 fixes the upper end at main part 1, and nickel layer 3 covers aspherical head 2's upper surface, and aspherical head 2's upper surface has aspheric surface 21, and wherein, main part 1 is formed by steel, and aspherical head 2 is formed by glass. When the mold insert is used, the mold insert is placed in a mold, and then plastic for forming a lens is introduced into the mold, and the nickel layer 3 on the aspheric head 2 is in contact with the plastic by moving the main body 1 of the mold insert, so that the aspheric surface 21 of the aspheric head 2 is copied to the optical plastic lens.

Specifically, with continued reference to fig. 1, the main body 1 includes: base 11, guide post 12 and shaping post 13, base 11, guide post 12 and shaping post 13 form fixedly from bottom to top in proper order, and the width of base 11 is greater than the width (the diameter) of guide post 12, and the width of guide post 12 is greater than the width (the diameter) of shaping post 13, and aspheric surface head 2 is fixed in the upper end of shaping post 13. The base 11 can limit the moving range of the molding dies in the mold, the guide column 12 can be matched with the guide channel of the mold to guide the moving direction of the molding dies, and the forming column 13 can be matched with the forming channel of the mold to realize the molding operation between the two molding dies.

Specifically, the upper surface of the aspherical head 2 further has positioning grooves 22 and a convex ring 23, the positioning grooves 22 are provided around the aspherical surface 21, and the convex ring 23 is provided at the edge of the aspherical head 2. The positioning groove 22 is used for forming a positioning boss of the optical plastic lens, and the convex ring 23 is used for forming an engaging surface of the optical plastic lens.

Specifically, the thickness of the nickel layer 3 is 0.2-0.25 mm.

As shown in fig. 3, the present invention further provides a method for manufacturing a mold insert of an optical plastic lens, which comprises the following steps:

step 1, die pressing an aspheric head, namely putting a glass preform into a die, heating the glass preform, and pressurizing the glass preform by using the die after the glass preform reaches a softening point of glass so as to deform the glass preform into the aspheric head;

step 2, core taking, namely, carrying out core taking treatment on the aspheric surface head to enable the diameter size of the aspheric surface head to meet the requirement;

step 3, ultrasonic cleaning, namely performing first ultrasonic cleaning on the aspheric surface head, removing impurities remained on the surface of the aspheric surface head after core taking, ensuring the surface cleanliness of the aspheric surface head and facilitating subsequent welding operation;

step 4, welding, namely welding the non-spherical head on the main body in a welding mode to form a semi-finished product of the mold core;

step 5, annealing, namely annealing the aspheric head to release the internal stress of the aspheric head (generated by welding);

step 6, ultrasonic cleaning, namely performing secondary ultrasonic cleaning on the semi-finished product, removing impurities remained on the surface of the semi-finished product after welding, ensuring the surface cleanliness of the semi-finished product and facilitating subsequent film coating operation;

and 7, coating, namely performing vacuum coating on the semi-finished product to form a nickel layer on the upper surface of the non-spherical head.

Specifically, in step 1, the mold is a tungsten steel mold core plated with diamond-like carbon, and the tungsten steel mold core applies pressure to the glass preform. In addition, the inside of the mold is vacuum or filled with nitrogen.

Specifically, in step 2, after the coring is completed, the error range of the diameter size of the aspherical head is ± 0.005 mm. Since it is difficult to ensure that the size of the aspherical head meets the requirement at one time through the molding process, the diameter size of the aspherical head needs to be adjusted through the coring process.

Specifically, in step 3, the aspherical head is subjected to ultrasonic cleaning in different cleaning tanks with an oil remover, a strong base, and pure water in this order. Wherein, the degreasing agent can maintain the integrity of the surface of the aspheric head; strong base can corrode impurities on the surface of the aspheric head; pure water can wash out chemicals (i.e., degreasers and alkalis) and impurities on the surface of the aspheric head. More specifically, in step 3, the number of cleaning tanks is 5 to 12, and the number of cleaning tanks using pure water is at least 3. More specifically, in step 3, after the ultrasonic cleaning is completed, the aspherical head is spin-dried.

Specifically, in step 4, after the welding is completed, the error range of the diameter size of the aspherical head is ± 0.001 mm. The size of the aspherical head at this step is only fully compatible with the final product requirements due to the shape variations of the welding process.

Specifically, in step 5, the temperature of the annealing treatment is the annealing point of the glass, and the time of the annealing treatment is 0.5h or more.

Specifically, in step 6, the aspherical head is subjected to ultrasonic cleaning in the cleaning tank using pure water in order. Because the impurities generated by welding are less, the second ultrasonic cleaning is simpler than the first ultrasonic cleaning, and dirt and foreign matters on the surface of the semi-finished product can be cleaned.

Specifically, in step 7, the semi-finished product is rotated at a constant speed while vacuum coating is performed. The uniformity of the coating film can be ensured to be better under the condition of uniform rotation.

Specifically, step 1.1 is also performed before step 4, the body is manufactured. Step 1.1 may be performed simultaneously with any of steps 1-3, as long as it is done before step 4. More specifically, the body is formed by machining.

Therefore, the mould pressing mould core is manufactured in a mould pressing mode, has reproducibility, does not need to be processed by aspheric surface ultra-precise processing equipment any more, greatly reduces the manufacturing cost and greatly improves the manufacturing efficiency. In addition, the Rockwell hardness of the glass is 58-64, which is higher than the hardness of steel and a nickel layer, so that the deformation is not easy to occur in the lens mould pressing process, and the forming size precision of the lens is favorably ensured.

The above-mentioned embodiments are merely preferred examples of the present invention, and do not limit the scope of the present invention, so all equivalent changes or modifications made by the structure, features and principles of the present invention should be included in the claims of the present invention.

Claims

1. The utility model provides a mould pressing mould benevolence of optics plastics lens which characterized in that: the molding die core comprises: main part (1), aspheric head (2) and nickel layer (3), aspheric head (2) is fixed the upper end of main part (1), nickel layer (3) cover the upper surface of aspheric head (2), the upper surface of aspheric head (2) has aspheric surface (21), main part (1) is formed by steel, aspheric head (2) is formed by glass.

2. The molding cavity for molding optical plastic lenses according to claim 1, wherein: the main body (1) comprises: base (11), guide post (12) and shaping post (13), base (11) guide post (12) with shaping post (13) form fixedly from up in proper order down, the width of base (11) is greater than the width of guide post (12), the width of guide post (12) is greater than the width of shaping post (13), aspheric surface head (2) are fixed the upper end of shaping post (13).

3. The molding cavity for molding optical plastic lenses according to claim 1, wherein: the upper surface of the aspheric surface head (2) is further provided with a positioning groove (22) and a convex ring (23), the positioning groove (22) is arranged around the aspheric surface (21), and the convex ring (23) is positioned at the edge of the aspheric surface head (2).

4. The molding cavity for molding optical plastic lenses according to claim 1, wherein: the thickness of the nickel layer (3) is 0.2-0.25 mm.