CN211339271U - Precision aspheric glass lens mould pressing device - Google Patents

Abstract

The utility model provides a glass lens is difficult to accurate aspheric surface glass lens mold pressing device who hazes. The lower heating group is arranged below the die and corresponds to the upper heating group; the mould is arranged on the mould moving device, the upper heating group is connected with the cylinder pressurizing device, the upper heating group, the mould, the lower heating group and the mould moving device are all arranged in the closed space of the closed device, the cylinder pressurizing device is arranged in multiple stages, the upper heating group and the lower heating group are also arranged in multiple stages, and the multi-stage cylinder pressurizing device is provided with a cylinder, a two-cylinder or/and a three-cylinder. The press of each stage of the utility model adopts reasonable cylinder number for pressing according to the process requirement, and can reduce the pressing temperature so as to effectively solve the problem of fogging of the glass lens; the shrinkage of the glass of the lens in the forming and cooling processes is monitored through the cylinder up-down displacement detection device, so that the fluctuation of the central thickness of the lens is avoided.

Description

Precision aspheric glass lens mould pressing device

Technical Field

The utility model relates to an optical glass molding device especially relates to a molding device of accurate aspheric surface glass lens.

Background

The aspheric optical lens can obtain higher imaging quality than spherical optical parts, can correct various aberrations well in an optical system, improves the imaging quality, adopts the lens of the aspheric optical lens to replace a plurality of spherical parts with one aspheric part, improves the image quality, optimizes the instrument structure, reduces the cost, and is mainly applied to high-end fields such as mobile phones or camera lenses, high-definition cameras, robot laser positioning glass eyes, laser illumination and the like.

The existing precision aspheric surface molding device is filled with N₂In the space, the upper heating group is driven by a servo motor to drive a piston rod to descend for carrying out die pressing forming processing, and the lens is finally formed mainly through heating, soaking, pressing, annealing, rapid cooling and other stages in the die pressing process, but the device has the following problems: the glass lens is easy to fog in a high-temperature state; the stainless steel sleeve on the profiling mold is profiled under high pressure at high temperature, and the deformation of the stainless steel sleeve fluctuates each time, so that the central thickness of the lens fluctuates.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a precision aspheric surface glass lens mold pressing device that glass lens is difficult to fog is provided.

The utility model provides a technical scheme that technical problem adopted is: the precision aspheric glass lens molding device comprises an upper heating group, a mold, a lower heating group, a mold moving device, a sealing device and a cylinder pressurizing device, wherein the lower heating group is arranged below the mold and corresponds to the upper heating group; the mould is arranged on the mould moving device, the upper heating group is connected with the cylinder pressurizing device, the upper heating group, the mould, the lower heating group and the mould moving device are all arranged in the closed space of the closed device, the cylinder pressurizing device is arranged in multiple stages, the upper heating group and the lower heating group are also arranged in multiple stages, and the multi-stage cylinder pressurizing device is provided with a cylinder, a two-cylinder or/and a three-cylinder.

Further, a cylinder vertical displacement detection device is arranged on the cylinder pressurization device.

Further, the enclosed space of the enclosed device is filled with inert gas.

Furthermore, a channel is arranged in the frame of the sealing device, and water is filled in the channel.

Further, the cylinder pressurization device is provided with 7 or 8 stages, and the upper heating group and the lower heating group are also provided with 7 or 8 stages.

Further, the maximum pressure of the cylinder pressurizing device is 900 kg/f.

Furthermore, the resolution ratio of the cylinder up-down displacement detection device is higher than 0.1 μm, the precision is higher than 1 μm, and the measurement stroke is larger than or equal to 10 mm.

The utility model has the advantages that: each stage of press is pressed by adopting a reasonable cylinder number according to the process requirement, so that the pressing temperature can be reduced, and the defect of fogging of the glass lens is effectively overcome; the shrinkage of the glass of the lens in the forming and cooling processes is monitored through the cylinder up-down displacement detection device, so that the fluctuation of the central thickness of the lens is avoided.

Drawings

Fig. 1 is a sectional view of a front view of the precision aspherical glass lens molding apparatus of the present invention.

Detailed Description

As shown in fig. 1, the precision aspheric glass lens molding device of the present invention comprises an upper heating group 1, a mold 2, a lower heating group 3, a mold moving device 4, a sealing device 5, a cylinder pressurizing device 6 and a cylinder vertical displacement detecting device 7, wherein the lower heating group 3 is disposed below the mold 2 and corresponds to the upper heating group 1; the mould 2 is arranged on the mould moving device 4, the mould moving device 4 can enable the mould 2 to accurately move to the position below the corresponding cylinder pressurizing device 6, and the mould 4 moves forwards one position at a time to be a first level; the upper heating group 1 is connected with a cylinder pressurizing device 6, the cylinder pressurizing device 6 provides thrust by a cylinder, and a piston rod acts on the upper heating group 1 connected with the cylinder pressurizing device, so that the force is transmitted to the upper part of the mold 2; the upper heating group 1, the die 2, the lower heating group 3 and the die moving device 4 are all arranged in a closed space of the closed device 5, the closed space of the closed device 5 is filled with inert gas to prevent each part and the die from being oxidized at high temperature, meanwhile, a channel 51 is also arranged in a frame of the closed device 5, water can be filled in the channel 51 to form water cooling, the whole closed device 5 is effectively protected, and the heated die 2 can be rapidly cooled; the cylinder up-and-down displacement detection device 7 is arranged on the cylinder pressurizing device 6, a reference point is arranged on the cylinder pressurizing device 6, and the cylinder up-and-down displacement detection device 7 can accurately measure the descending height of the upper heating group 1 during each pressing process so as to ensure the stability of the pressing process.

The utility model discloses an accurate aspheric surface glass lens molding device sets up multistage cylinder pressure device 6, goes up heating group 1 simultaneously and adds heating group 3 down and also sets up to multistage, like 7 grades or 8 grades, shows 7 grades of cylinder pressure device 6 in FIG. 1, goes up heating group 1 and adds heating group 3 down and also sets up to 7 grades.

The die mould lens that adopts current molding device to obtain easily hazes, proves die mould temperature is too high, nevertheless reduces die mould temperature, and glass's viscosity is bigger, and if the pressure that cylinder driving screw provided is not enough, the lens can not the shaping, because current molding device can only provide 450 kg/f's maximum pressure, has restricted the die mould temperature of lens die mould process, consequently the utility model discloses a molding device increases the pressure that provides, and every level of press cylinder can have a jar, two jars or/and three jars according to the technology needs cylinder number, passes through piston rod mechanical connection between two cylinders, and the adjustable scope of cylinder pressure is 0.1-0.9MPa, and the cylinder bore scope of cylinder is phi 32-phi 80. Fig. 1 shows a cylinder pressurizing device 6 using one cylinder and three cylinders, and the molding device of the present invention adjusts the maximum pressure of the conventional molding device from 450kg/f to 900kg/f, and the maximum pressures to be pressurized at each position are not completely the same, and thus the functions of the respective stages are different.

In the repeated compression process, the stainless steel sleeve on the compression mold is subjected to hot pressing at high temperature, the variation is large, the central thickness of the glass lens is large, and the imaging can be influenced by the change of the central thickness of the lens for the high-precision lens. Therefore, the utility model discloses displacement detection device 7 about setting up the cylinder on cylinder pressure device 6, it is undulant through displacement detection device 7 feedback lens center thickness about the cylinder, promptly: and monitoring the shrinkage of the glass of the lens in the forming and cooling processes by the variable quantity of the descending displacement in each compression process. The resolution ratio of a linear scale or a grating displacement sensor in the cylinder up-down displacement detection device 7 is higher than 0.1 mu m, the precision is higher than 1 mu m, and the measurement stroke is more than or equal to 10 mm.

During operation, the assembled mold 2 and the glass lens are moved to a closed space filled with protective gas nitrogen by the mold moving device 4, the glass lens passes through each stage and is acted on the upper surface of the mold by the cylinder pressurizing device 6, so that the glass lens is molded at high temperature, meanwhile, the central thickness of the lens in the molding and cooling process is monitored by the cylinder vertical displacement detection device 7, and the glass lens in the mold 2 is molded in the mold through the processes of heating, profiling, cooling and the like.

Practice proves that the highest pressure type temperature of the utility model can be reduced by more than 5 ℃, and the fogging incidence rate of a certain product is reduced to 38 percent from the prior 100 percent. The utility model discloses the device wholly changes for a short time on prior art basis, but the die mould in-process on-the-spot monitoring glass lens thickness die mould volume.

Claims (7)

1. The precision aspheric glass lens molding device comprises an upper heating group (1), a mold (2), a lower heating group (3), a mold moving device (4), a sealing device (5) and a cylinder pressurizing device (6), wherein the lower heating group (3) is arranged below the mold (2) and corresponds to the upper heating group (1); mould (2) set up on mould mobile device (4), go up heating group (1) and be connected with cylinder pressure device (6), go up heating group (1), mould (2), lower heating group (3) and mould mobile device (4) and all set up in the airtight space of closing device (5), its characterized in that: the cylinder pressurizing device (6) is arranged in multiple stages, the upper heating group (1) and the lower heating group (3) are also arranged in multiple stages, and the multi-stage cylinder pressurizing device (6) is provided with a cylinder, a two-cylinder or/and a three-cylinder.

2. The precision aspheric glass lens molding apparatus as defined in claim 1, wherein: and an air cylinder vertical displacement detection device (7) is arranged on the air cylinder pressurizing device (6).

3. The precision aspherical glass lens molding apparatus according to claim 1 or 2, wherein: the enclosed space of the enclosed device (5) is filled with inert gas.

4. The precision aspherical glass lens molding apparatus according to claim 1 or 2, wherein: a channel (51) is further arranged in the frame of the sealing device (5), and the channel (51) is filled with water.

5. The precision aspherical glass lens molding apparatus according to claim 1 or 2, wherein: the cylinder pressurizing device (6) is provided with 7 or 8 stages, and the upper heating group (1) and the lower heating group (3) are also provided with 7 or 8 stages.

6. The precision aspherical glass lens molding apparatus according to claim 1 or 2, wherein: the maximum pressure of the cylinder pressurizing device (6) is 900 kg/f.

7. The precision aspherical glass lens molding apparatus according to claim 1 or 2, wherein: the resolution of the cylinder up-down displacement detection device (7) is higher than 0.1 mu m, the precision is higher than 1 mu m, and the measurement stroke is larger than or equal to 10 mm.

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