阅读说明：本技术 矿用设备中玻璃镜片精密模压成型方法 (Precision compression molding method for glass lens in mining equipment ) 是由 何斌全 兰晓平 张宗生 潘东 姚炯 于 2021-09-08 设计创作，主要内容包括：本发明提供了一种矿用设备中玻璃镜片精密模压成型方法。该方法基于玻璃镜片精密模压成型装置,按照相关工序对矿用设备中玻璃镜片进行加工制造；玻璃镜片精密模压成型方法为：将玻璃预形体放置在成型装置内,使用上下环形电极产生的电弧直接对玻璃预形体进行电弧加热以将玻璃预形体加热至一定温度,使用加压装置对玻璃预形体施加压力并保压一定时间,之后再将玻璃预形体加热到另一温度保压一定时间进行去应力退火,最后使用冷却装置冷却玻璃预形体并且卸去压力,开模取出成型后的玻璃镜片。本发明提供的方法能够制造出具有高成型质量以及高成型精度的玻璃镜片。(The invention provides a precise compression molding method for glass lenses in mining equipment. The method is based on a glass lens precision compression molding device, and the glass lens in the mining equipment is processed and manufactured according to relevant procedures; the method for precisely molding the glass lens comprises the following steps: the glass preform is placed in a forming device, electric arcs generated by upper and lower annular electrodes are used for directly carrying out electric arc heating on the glass preform so as to heat the glass preform to a certain temperature, a pressurizing device is used for applying pressure to the glass preform and maintaining the pressure for a certain time, then the glass preform is heated to another temperature and maintained the pressure for a certain time for stress relief annealing, finally a cooling device is used for cooling the glass preform and relieving the pressure, and the mold is opened to take out the formed glass lens. The method provided by the invention can manufacture the glass lens with high molding quality and high molding precision.)

1. A glass lens precision compression molding method in mining equipment is used for a glass lens precision compression molding device; the method is characterized in that: the glass lens precision compression molding device comprises a frame (1), a molding device for molding a glass preform (2), a heating device for heating the glass preform (2), a pressurizing device for applying pressure to the glass preform (2) and a cooling device for cooling the glass preform (2); the forming device comprises an upper die (3) and a lower die (4);

the heating device comprises an upper annular electrode (11), a lower annular electrode (12), a vacuum cover (13) sleeved on the peripheries of the upper annular electrode (11) and the lower annular electrode (12), an upper sealing ring (14) arranged above the vacuum cover (13) and a lower sealing ring (15) arranged below the vacuum cover (13);

the pressurizing device comprises an oil cylinder (16), a hydraulic pump (17) and an electromagnetic valve (18) which are arranged on the oil cylinder (16), a hydraulic cylinder (19) which is arranged on the rack (1), a piston rod (20) which is arranged above the hydraulic cylinder (19), a transmission block (21) which is arranged above the piston rod (20) and a pressure sensor (22) which is arranged on the piston rod (20);

the cooling device comprises an upper cooling water block (23) and a lower cooling water block (24);

the precision compression molding method for the glass lens in the mining equipment comprises the following steps:

s1, installing the forming device, the heating device, the pressurizing device and the cooling device; placing the glass preform (2) on the lower mold (4); pumping out air in the vacuum hood (13) and filling inert gas;

s2, switching on the power supply of the upper ring electrode (11) and the lower ring electrode (12), heating the glass preform (2) by the generated arc, and starting from room temperature T₀Heating to T₁(ii) temperature;

s3, keeping the temperature at the set temperature, and applying pressure P to the lower die (4) by using the hydraulic pump (17)₁Dwell time of t₁；

S4, keeping the glass preform (2) at the temperature T₂Applying a pressure P to the lower die (4) by using the hydraulic pump (17)₂Dwell time of t₂Performing stress relief annealing;

s5, introducing cooling water into the upper cooling water block (23) and the lower cooling water block (24), opening the electromagnetic valve (18) to unload the pressure provided by the pressurizing device, separating the upper die (3) from the lower die (4), and taking out the molded glass lens.

2. The precision press molding method for glass lenses according to claim 1, characterized in that: in step S2, the upper ring electrode (11) is connected to a positive power supply electrode by a lead wire and is positively charged; the lower annular electrode (12) is connected with the negative electrode of a power supply through a lead and is negatively charged; after the power supply is switched on, an electric arc can be formed between the upper annular electrode (11) and the lower annular electrode (12).

3. The precision press molding method for glass lenses according to claim 1, characterized in that: in step S2, the T₁The temperature is equal to the yield temperature At + -10 deg.C of the glass material.

4. The precision press molding method for glass lenses according to claim 1, characterized in that: in step S3, the pressure P₁The value range of (A) is 0.05-5 MPa.

5. The precision press molding method for glass lenses according to claim 1, characterized in that: in step S3, the heat retention time t₁The value range of (A) is 20-100 s.

6. The precision press molding method for glass lenses according to claim 1, characterized in that: in step S4, the T₂The temperature range is 218-222 ℃.

7. The precision press molding method for glass lenses according to claim 1, characterized in that: in step S4, the pressure P₂The value range of (A) is 0.02-2 MPa.

8. The precision press molding method for glass lenses according to claim 1, characterized in that: in step S4, the heat retention time t₂The value range of (A) is 10-100 s.

9. The precision press molding method for glass lenses according to claim 1, characterized in that: the upper annular electrode (11) is connected with the upper die (3); the lower annular electrode (12) is connected with the lower die (4); the upper annular electrode (11), the upper die (3), the lower annular electrode (12) and the lower die (4) are all positioned in the vacuum cover (13); inert gas can be introduced into the vacuum cover (13) to serve as protective gas; and a temperature sensor is arranged in the vacuum cover (13).

10. The precision press molding method for glass lenses according to claim 1, characterized in that: the upper cooling water block (23) and the lower cooling water block (24) are externally connected with water pipes.

Technical Field

The invention relates to the technical field of compression molding, in particular to a precision compression molding method for glass lenses.

Background

With the popularization of intelligent mine construction, laser three-dimensional scanners, infrared laser range finders, infrared thermal imagers and various unmanned intelligent detection systems are widely applied to mine construction, optical glass lenses play a very critical role in the devices, and the forming precision and the optical performance of the lenses directly determine the imaging quality and the system identification capability of the devices. The existing method for molding the optical lens mainly comprises compression molding, and the compression molding mainly comprises four stages of heating, pressurizing, annealing and cooling.

The heating method of the existing optical element lens compression molding equipment generally adopts a direct mold heating method and an infrared heating method. The direct heating method of the mold needs to use a heating plate to heat the mold in advance, and then heat is transferred to the glass blank through heat conduction, so that the heating and heat dissipation time is long, and the complex element is heated unevenly in the mold; adopt compression molding equipment of infrared heating method, its required infrared heating device structure is complicated, the volume is great and need be fixed, and is relatively poor to the optical element processing adaptability of equidimension not, and energy utilization is lower, and optical element is heated inhomogeneously, and infrared heating lamp fragile simultaneously, and the whole life of equipment is short.

In view of the above-mentioned drawbacks, some scholars try to heat the preform of the optical element by microwave heating, and the patent of patent application No. CN201611192680.7 discloses a microwave heating precision press molding apparatus for producing glass lens, which uses a microwave magnetron to generate microwave and radiate the microwave to a sleeve, the outer wall of the sleeve is coated with a microwave absorbing heating coating, and the microwave energy is converted into heat to heat the glass blank, but the heating method still has the following disadvantages: (1) although the heat transfer efficiency is improved, the optical element preform is heated unevenly; (2) the new compression molding apparatus is relatively complex in construction, costly and inconvenient to maintain.

In view of the above, there is a need for an improved method for precision press molding of glass lenses to solve the above problems.

Disclosure of Invention

The invention aims to provide a glass lens precision compression molding method in mining equipment, which directly heats a glass preform by using electric arcs generated by an upper annular electrode and a lower annular electrode, shortens the heat transfer distance, shortens the heating time, and can ensure that the glass preform is heated more uniformly so as to manufacture glass lenses with higher molding quality and molding precision.

In order to realize the aim, the invention provides a glass lens precision compression molding method in mining equipment, which is used for a glass lens precision compression molding device; the glass lens precision compression molding device comprises a frame, a molding device for molding a glass preform, a heating device for heating the glass preform, a pressurizing device for applying pressure to the glass preform and a cooling device for cooling the glass preform; the forming device comprises an upper die and a lower die;

the heating device comprises an upper annular electrode, a lower annular electrode, a vacuum cover sleeved on the peripheries of the upper annular electrode and the lower annular electrode, an upper sealing ring arranged above the vacuum cover and a lower sealing ring arranged below the vacuum cover;

the pressurizing device comprises an oil cylinder, a hydraulic pump and an electromagnetic valve which are arranged on the oil cylinder, a hydraulic cylinder arranged on the rack, a piston rod arranged above the hydraulic cylinder, a transmission block arranged above the piston rod and a pressure sensor arranged on the piston rod;

the cooling device comprises an upper cooling water block and a lower cooling water block;

the precision compression molding method for the glass lens in the mining equipment comprises the following steps:

s1, installing the forming device, the heating device, the pressurizing device and the cooling device; placing the glass preform on the lower mold; pumping out air in the vacuum hood and filling inert gas;

s2, switching on the power supply of the upper ring electrode and the lower ring electrode, heating the glass preform by the generated electric arc, and heating the glass preform from room temperature T0 to T1 temperature;

s3, keeping the temperature at the set temperature, applying pressure P1 to the lower die by using the hydraulic pump, and keeping the pressure for t 1;

s4, keeping the glass preform at the temperature of T2, applying pressure P2 to the lower die by using the hydraulic pump, keeping the pressure for T2, and performing stress relief annealing;

and S5, introducing cooling water into the upper cooling water block and the lower cooling water block, opening the electromagnetic valve to remove the pressure provided by the pressurizing device, separating the upper die from the lower die, and taking out the molded glass lens.

As a further improvement of the present invention, in step S2, the upper ring electrode is connected to the positive power supply electrode through a lead wire and is positively charged; the lower annular electrode is connected with the negative electrode of the power supply through a lead and is negatively charged; after the power supply is switched on, an arc can be formed between the upper ring electrode and the lower ring electrode.

As a further improvement of the present invention, in step S2, the T1 temperature is equal to the yield temperature At ± 10 ℃ of the glass material.

As a further improvement of the present invention, in step S3, the pressure P1 is in the range of 0.05 to 5 MPa.

As a further improvement of the present invention, in step S3, the value of the holding time t1 is in the range of 20 to 100S.

As a further improvement of the invention, in step S4, the value range of the T2 temperature is 218-222 ℃.

As a further improvement of the present invention, in step S4, the value of the pressure P2 is in the range of 0.02 to 2 MPa.

As a further improvement of the present invention, in step S4, the value of the holding time t2 is in the range of 10 to 100S.

As a further improvement of the present invention, the upper ring electrode is connected to the upper mold; the lower annular electrode is connected with the lower die; the upper annular electrode, the upper die, the lower annular electrode and the lower die are all positioned in the vacuum cover; inert gas can be introduced into the vacuum cover to serve as protective gas; and a temperature sensor is arranged in the vacuum cover.

As a further improvement of the invention, the upper cooling water block and the lower cooling water block are externally connected with water pipes.

The invention has the beneficial effects that:

(1) according to the precise compression molding method for the glass lens in the mining equipment, the glass preform is directly heated by using the electric arcs generated by the upper and lower annular electrodes, so that the heat transfer distance is shortened, and the heat conversion efficiency and the heat transfer efficiency in the heating process are greatly improved; meanwhile, due to the reduction of the heating time, the glass preform is heated more uniformly, and the forming quality and the forming precision of the formed glass lens are also improved.

(2) Compared with the traditional direct heating method, the method for precisely compression molding the glass lens in the mining equipment provided by the invention has the advantages that the heating plate is not needed by using electric arc heating, and the vacuum cover is only needed to be added to the molding device, so that the structure of the heating device of the whole compression molding equipment is simplified, and the operation is more convenient.

(3) The invention provides a precise compression molding method for glass lenses in mining equipment, which uses a replaceable molding die, can be simultaneously provided with a plurality of dies, and can be used for producing high-precision glass lenses of different types such as a double-spherical surface, a double-aspherical surface, a single-spherical surface and the like in batches.

(4) The precision compression molding method for the glass lens provided by the invention is safe and reasonable in operation, simple and convenient in operation process, and has higher stability and stronger reliability.

Drawings

FIG. 1 is a schematic view showing the structure of a glass lens precision press molding apparatus used in the present invention.

Reference numerals

100-precision compression molding device for glass lens; 1-a frame; 2-glass preform; 3, molding the die; 4-lower mould; 5-an upper die holder; 6-fixing the shaft on the upper die; 7-centering means; 8-an angle adjusting block; 9-a lower die holder; 10-a lower die fixing shaft; 11-upper ring electrode; 12-a lower ring electrode; 13-a vacuum hood; 14-upper sealing ring; 15-lower sealing ring; 16-oil cylinder; 17-a hydraulic pump; 18-a solenoid valve; 19-a hydraulic cylinder; 20-a piston rod; 21-a transmission block; 22-a pressure sensor; 23-feeding cooling water blocks; 24-lower cooling water block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.

In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, the present invention provides a precision press molding apparatus for glass lenses, which is used for manufacturing lenses with high molding quality and high molding precision; the glass lens precision compression molding device comprises a frame 1, a molding device for molding a glass preform 2, a heating device for heating the glass preform 2, a pressurizing device for applying pressure to the glass preform 2 and a cooling device for cooling the glass preform 2.

Specifically, the forming device comprises an upper die 3 and a lower die 4 which are arranged oppositely up and down, an upper die holder 5 arranged above the upper die 3, an upper die fixing shaft 6 arranged above the upper die holder 5, a centering device 7 and an angle adjusting block 8 arranged on the upper die fixing shaft 6, a lower die holder 9 arranged below the lower die 4 and a lower die fixing shaft 10 arranged below the lower die holder 9; forming device can set up mould 3 and lower mould 4 on a plurality of simultaneously, and goes up mould 3 and lower mould 4 and can customize according to the structure of required glass lens, so sets up, and different types such as the two sphere of this device ability batch production high accuracy, two aspheric surfaces and single sphere.

The heating device comprises an upper ring electrode 11, a lower ring electrode 12, a vacuum cover 13 sleeved on the peripheries of the upper ring electrode 11 and the lower ring electrode 12, an upper sealing ring 14 arranged above the vacuum cover 13 and a lower sealing ring 15 arranged below the vacuum cover 13. In this embodiment, a middle plate is provided in the middle of the frame 1, and one end of the vacuum cover 13 is attached to the middle plate. A temperature sensor is also arranged in the vacuum cover 13, and the temperature in the vacuum cover 13 can be monitored in real time so as to obtain the accurate temperature of the glass preform 2 in the vacuum cover 13. When in use, after the air in the vacuum hood 13 is pumped out and filled with inert gas, the power supply of the upper ring electrode 11 and the lower ring electrode 12 is respectively switched on, electric arcs can be generated between the upper ring electrode 11 and the lower ring electrode 12, and the glass preform 2 in the middle of the mold can be heated by the electric arcs.

The pressurizing device comprises an oil cylinder 16, a hydraulic pump 17 and an electromagnetic valve 18 which are arranged on the oil cylinder 16, a hydraulic cylinder 19 arranged on the rack 1, a piston rod 20 arranged above the hydraulic cylinder 19, a transmission block 21 connected with the piston rod 20 and a pressure sensor 22 arranged on the piston rod 20; the piston rod 20 can be driven to move up and down in the transmission block 21 by controlling the hydraulic pump 17 and the electromagnetic valve 18, the transmission block 21 can be pushed up by the piston rod 20 until the pressure is transmitted to the lower die 4, so that the lower die 4 is pushed to move upwards to contact the upper die 3, and the die assembly process of the die is realized; after the pressure provided by the pressurizing device is removed, the lower die 4 can move downwards, and the die opening process of the die is realized. In particular, the pressure sensor 22 can monitor the pressure provided by the piston rod 20 in real time, and the pressure sensor 22 can feed back a pressure signal to the hydraulic controller, which in turn controls the hydraulic pump 17 to ensure that the pressure applied to the lower mold 4 is within a predetermined range.

The cooling device comprises an upper cooling water block 23 arranged above the upper die holder 5 and a lower cooling water block 24 arranged below the lower die holder 9. The upper cooling water block 23 and the lower cooling water block 24 are both externally connected with water pipes, and the upper die base 23 and the lower die base 24 can be cooled by introducing cooling water into the upper cooling water block 23 and the lower cooling water block 24 through the water pipes so as to cool the glass preform 2.

Referring to fig. 1, the precision press molding method for glass lenses in mining equipment provided by the invention comprises the following steps:

s1, installing a forming device, a heating device, a pressurizing device and a cooling device; placing the glass preform 2 on the lower die 4; then, the upper seal ring 14 and the lower seal ring 15 at the upper end and the lower end of the vacuum hood 13 are fixed, and after the airtightness of the vacuum hood 13 is checked, the air in the vacuum hood 13 is pumped out and inert gas is filled for use as protective gas;

s2, switching on the power supply of the upper ring electrode 11 and the lower ring electrode 12, forming an electric arc between the upper ring electrode 11 with positive electricity and the lower ring electrode 12 with negative electricity, heating the glass preform 2 by using the generated electric arc, and heating the glass preform 2 from room temperature to the yield temperature At +/-10 ℃ of the material;

s3, keeping the glass preform 2 at the set temperature; then, the hydraulic pump 17 is opened, oil in the oil cylinder 16 can rush into the hydraulic cylinder 19 through the hydraulic pump 17, the oil can push a piston rod 20 in the transmission block 21 upwards, meanwhile, the piston rod 20 can drive the transmission block 21 to move upwards, then the lower die fixing shaft 10, the lower die holder 9 and the lower die 4 can be driven to move upwards, and when the lower die 4 contacts the upper die 3, the die closing process is completed; then, the hydraulic pump 17 is controlled to apply pressure of 0.05-5MPa to the lower die 4, and the maintaining time is 20-100 s;

s4, keeping the glass preform 2 at 218-222 ℃ by adjusting the arc energy; then the pressure born by the lower die 4 is controlled to be 0.02-2MPa by controlling the hydraulic pump 17, and the duration is 10-100 s; meanwhile, the original inert gas in the vacuum cover 13 is pumped away and new inert gas is filled at a certain speed; at this time, the glass preform 2 is subjected to stress relief annealing;

s5, introducing cooling water into the upward cooling water block 23 and the lower cooling water block 24 to respectively cool the upper die holder 5 and the lower die holder 9, thereby completing the cooling of the glass preform 2; after cooling, the electromagnetic valve 18 is opened, oil in the hydraulic cylinder 19 flows back to the oil cylinder 16 at a certain speed, the piston rod 20 falls down, and meanwhile, the lower die fixing shaft 10, the lower die seat 9 and the lower die 4 are driven to move downwards, so that the die opening process of the die is realized; after the mold is opened, the molded glass lens can be taken out from the lower mold 4.

In summary, in the precision compression molding method for glass lenses in mining equipment provided by the invention, the glass preform 2 is directly heated by the electric arcs generated by the upper annular electrode 11 and the lower annular electrode 12, so that the heat transfer distance is shortened, the heating time is shortened, the glass preform 2 can be heated more uniformly, and compared with the traditional method, the glass lenses with higher molding quality and higher molding precision can be manufactured; the method has high stability and reliability, and is suitable for large-area popularization in the field of optical lens forming.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.