Aspherical optical lens milling apparatus and method

Abstract

This invention relates to the field of milling equipment, and more particularly to a milling equipment and method for aspherical optical lenses, comprising a machine body and a parabolic reflective lens. The machine body has a machining cavity inside, and a hydraulic lifting platform is installed at the bottom front side of the machining cavity. A working slide is installed at the top working end of the hydraulic lifting platform, and a support frame is installed on the top moving part of the working slide. A liquid tank is installed on the top of the support frame, and a reduction motor is installed at the middle of both ends of the liquid tank. An electric telescopic rod is fixedly connected to the drive end of each reduction motor. The electric telescopic rod passes through the middle of both ends of the milling cutter and is rotatably connected to the milling cutter through sealed bearings. This invention changes the rheological state of the electromagnetic rheological fluid through an excitation coil, improving the support stiffness of the flexible inner bladder, avoiding local stress concentration caused by traditional point supports, reducing inconsistent vibration during the milling of thin-walled aspherical lenses, and improving edge processing accuracy and dimensional consistency.

Description

Technical Field

[0001] This invention relates to the field of milling equipment, and more particularly to an aspherical optical lens milling equipment and method. Background Technology

[0002] Metal-based aspherical parabolic reflectors are widely used in aerospace, astronomical observation, laser optics and infrared imaging due to their advantages such as light weight, good thermal conductivity and high processing efficiency. In the manufacturing process of reflectors, in order to ensure assembly accuracy and edge dimension consistency, it is usually necessary to mill the outer edge of the lens to remove the machining allowance and form the shape and size that meet the design requirements.

[0003] Existing milling equipment for parabolic mirrors mostly uses rigid clamps to fix the mirrors and then uses milling cutters to continuously mill the edges of the mirrors. Since aspherical mirrors usually have characteristics such as large curvature changes and uneven thickness on both sides of the edges, rigid clamping can easily generate large clamping stresses in local areas. During the milling process, the mirrors are also subjected to the combined effects of cutting forces and processing heat, which can cause local elastic deformation or dimensional displacement, affecting the edge processing accuracy. At the same time, the uneven thickness on both sides of the mirror during milling can lead to uneven milling forces on both sides of the edges, making the mirror edges prone to processing defects. During the milling process, the processing fluid is prone to splashing, and processing debris can easily fall into the processing fluid, which not only affects the processing environment but also increases the difficulty of processing fluid recycling and equipment cleaning. Therefore, it is necessary to design a milling equipment for metal-based aspherical mirrors that can take into account the stable support of the mirror, the sealing of the processing environment, and the recovery of processing fluid to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing an aspherical optical lens milling device and method.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: an aspherical optical lens milling device, comprising a machine body and a parabolic reflective lens, wherein a processing cavity is provided inside the machine body, a hydraulic lifting platform is installed on the bottom front side of the processing cavity, a working slide is installed on the top working end of the hydraulic lifting platform, a stand is installed on the top moving part of the working slide, a liquid tank is installed on the top of the stand, a reduction motor is installed at the middle of both ends of the liquid tank, an electric telescopic rod is fixedly connected to the drive end of each reduction motor, the electric telescopic rod passes through the middle of both ends of the liquid tank and is rotatably connected to the liquid tank through a sealed bearing, a vacuum suction cup and an inner support plate are respectively installed at the telescopic ends of the electric telescopic rods on both sides, a flexible inner bladder is installed on the inner side of the end of the inner support plate away from the electric telescopic rod, an excitation coil is provided inside the flexible inner bladder and filled with an electromagnetic rheological fluid, and so on. The top of the liquid tank is corrugated, and limit frames are installed on the front and rear sides of the top of the corrugated section. Servo motors are installed on the lower parts of the front and rear sides of the liquid tank. Threaded rods are installed on the top drive ends of the servo motors. The top of the threaded rods passes through the top of the corrugated section and is threadedly connected to the top of the corrugated section. Sealing plates are slidably connected to both sides of the top of the corrugated section. Magnetic strips are embedded in the inner side of the sealing plates. Rewinding chambers are installed in the middle of the front and rear sides of the liquid tank. Rewinding rollers are installed inside the rewinding chambers via coil springs. Sealing pads are wound around the outer circumference of the rewinding rollers. The end of the sealing pad away from the rewinding roller passes through the top of the rewinding chamber. The end of the sealing pad away from the rewinding chamber passes through the limit frame and is slidably connected to the limit frame. Limit strips are fixedly connected to the end of the sealing pad. Magnetic coatings are provided on the outside of the sealing pads. Electromagnets are installed at the four ends of the top of the corrugated section.

[0006] Preferably, a machining spindle is installed on one side of the machine body, and a milling cutter is installed on the drive end of the machining spindle. The milling cutter is used to mill the edge of the parabolic reflector.

[0007] Preferably, a control panel is installed on the upper part of one side of the front end of the machine body, and the control panel is used to control other electrical control equipment.

[0008] Preferably, a drainage trough is provided on the rear side of the hydraulic lifting platform, and an inclined guide frame is installed on the inner side of the upright frame, with the outlet of the guide frame facing the drainage trough.

[0009] Preferably, a replenishment pipe is fixedly connected to the lower rear side of the liquid tank, and a pump body is installed at the end of the replenishment pipe away from the liquid tank. The pump body is installed inside the rear side of the processing cavity, and an external liquid tank is connected to the input end of the pump body.

[0010] Preferably, drain outlets are fixedly connected to both sides of the bottom of the liquid tank, the drain outlets penetrate the top of the upright frame, and the drain outlets are all located on the upper side of the guide frame.

[0011] Preferably, the vacuum suction cup and the flexible inner bladder are respectively disposed on both sides of the parabolic reflector. The side of the vacuum suction cup away from the parabolic reflector is connected to a vacuum pump through a connecting pipe and a rotary joint. The vacuum pump is installed on one side of the bottom of the processing chamber.

[0012] Preferably, a fixing strip is installed on both sides of the liquid tank, and a sliding groove is opened in the middle of the fixing strip. A slider is slidably connected to the front and rear sides of the sliding groove. A positioning roller is installed in the middle of the slider on both sides. A motor compartment is installed at the lower part of the front and rear sides of the liquid tank. A stepper motor is installed on both sides of the motor compartment, and a lead screw is fixedly connected to the drive end of the stepper motor.

[0013] Preferably, the end of the lead screw away from the motor compartment passes through the side wall of the liquid tank and is rotatably connected to the liquid tank through a sealed bearing, and the end of the lead screw away from the motor compartment passes through the slider and is threadedly connected to the slider.

[0014] Preferably, a method for milling aspherical optical lenses includes the following steps: S1. Specification Adjustment: Based on the outer diameter of the polished reflective lens to be processed, start the stepper motor in the motor compartment, drive the lead screw to rotate, and make the slider move synchronously along the groove on the fixed bar, causing the positioning rollers to move closer or further apart, so that the distance between the two positioning rollers is adapted to the specifications of the polished reflective lens to be processed. S2, Lens clamping: The parabolic reflector is placed in the liquid tank, positioned between the two positioning rollers. The two geared motors are activated to drive the corresponding electric telescopic rods to move synchronously towards the center, so that the vacuum suction cup is attached to the flat side of the parabolic reflector and a vacuum suction is formed by the vacuum pump. At the same time, the inner support plate extends into the concave side of the parabolic reflector, so that the flexible inner bladder is attached to the inner wall of the parabolic reflector, thus achieving the initial fixation of the lens. S3. Establish flexible support: By energizing the excitation coil inside the flexible inner bladder, the electromagnetic rheological fluid filling the flexible inner bladder changes from a fluid state to a high viscosity state, thereby improving the overall support stiffness of the flexible inner bladder and forming a uniform fit and support between the flexible inner bladder and the inner wall of the parabolic reflector, thus improving the stability of the lens clamping. S4. Establish the immersion environment: The processing fluid is injected into the liquid tank through the replenishment pipe, so that the main body of the polished reflective lens is submerged in the processing fluid, leaving only the edge to be processed exposed above the liquid surface; S5. Processing position adjustment: Start the hydraulic lifting platform to lift the work slide and the upright as a whole. At the same time, the work slide moves the liquid tank laterally so that the edge of the polished mirror to be processed corresponds to the position of the milling cutter on the machining spindle. S6. Sealing of the processing area: Start the servo motor to drive the threaded rod to rotate, causing the corrugated section to extend and retract vertically to adjust the size of the opening at the top of the liquid tank; then move the sealing plate and the sealing gasket along the limit frame to close the unprocessed area at the top of the liquid tank, leaving only the opening required for milling; then activate the electromagnet set at the top of the corrugated section to attract and fix the sealing plate and sealing gasket. S7. Milling edge processing: Start the machining spindle to drive the milling cutter to rotate at high speed. Through the coordination and adjustment of the hydraulic lifting platform and the working slide, the milling cutter moves continuously along the edge of the parabolic reflector to mill the edge exposed above the liquid surface until the entire edge is machined. S8. Drainage recovery: After milling is completed, the sealing plate and gasket are removed from the liquid tank, the machining spindle is stopped, and the machining fluid and machining debris in the liquid tank are discharged through the drain outlet and flow into the drainage tank along the guide frame for centralized collection. Then, the excitation state of the flexible inner bladder is released, the electromagnetic rheological fluid is restored to its flow state, the electric telescopic rod is driven to retract, the vacuum chuck is released from the adsorption of the parabolic reflector, and the lens is unloaded.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention achieves composite clamping of both sides of a parabolic reflector lens through the cooperation of a vacuum chuck and an inner support plate. A flexible inner bladder filled with electromagnetic rheological fluid is set on the inner support plate. The flexible inner bladder can conform to the concave surface of the lens with different curvatures under the push of an electric telescopic rod. By adjusting the working state and current of the excitation coil, the rheological state of the electromagnetic rheological fluid is changed, which improves the support stiffness of the flexible inner bladder and forms a large area of ​​uniform support on the inner side of the lens. This avoids the local stress concentration caused by traditional point support, reduces vibration, springback and edge chipping during the milling process of thin-walled aspherical lenses, and improves edge processing accuracy and dimensional consistency.

[0016] 2. This invention, by setting up a liquid tank, immerses the parabolic reflector in the processing fluid, leaving only the edge to be processed exposed above the fluid surface. During the milling process, the processing fluid can continuously absorb the processing heat conducted from inside the lens and provide a certain buoyancy support for the parabolic reflector, reducing the tendency of deformation caused by its own weight and heat during processing. This allows the lens to maintain good dimensional stability during edge milling, while reducing temperature fluctuations in the processing area. This provides a stable processing environment for continuous edge milling of the parabolic reflector and improves milling quality.

[0017] 3. This invention uses a corrugated section, a sealing plate, and a sealing gasket to form an adjustable sealing structure. The corrugated section can adjust the size of the opening at the top of the liquid tank, and the sealing plate and sealing gasket can seal the unprocessed area at the top of the liquid tank according to the processing position. They are also used with an electromagnet for adsorption and fixation, leaving only the parabolic reflector to pass through the required processing opening. This effectively reduces the splashing and evaporation of the processing fluid and the entry of external impurities into the liquid tank. At the same time, it reduces the amount of processing debris falling into the processing fluid, improves the sealing performance of the processing area, reduces the degree of processing fluid contamination, and reduces the amount of subsequent maintenance work.

[0018] 4. This invention uses a stepper motor to drive a lead screw, which in turn moves the positioning rollers synchronously. This allows the spacing between the positioning rollers to be adjusted according to the specifications of the parabolic reflector. It forms a stable limiting guide on both sides of parabolic reflectors of different diameters. Combined with the flexible inner bladder, it provides adaptive support for the concave side of the parabolic reflector. This allows the same equipment to be adapted to parabolic reflectors of different sizes and curvatures without the need for frequent changes of special fixtures. This expands the applicability of the equipment and improves the utilization rate and processing stability of the equipment.

[0019] 5. This invention sets a drain outlet at the bottom of the liquid tank, and forms a processing fluid recovery channel with the guide frame and drain tank. This allows the processing fluid and fine debris to be discharged and collected in a timely manner after processing, which facilitates the recycling of the processing fluid after filtration. At the same time, it reduces the accumulation of processing fluid and debris residue inside the equipment, reduces the frequency of equipment cleaning, improves the continuous processing capacity of the equipment and the cleanliness of the processing environment, and helps to reduce the consumption and use cost of processing fluid. Attached Figure Description

[0020] Figure 1 This is a frontal three-dimensional structural diagram of an aspherical optical lens milling device and method according to the present invention; Figure 2 This is a front view of the internal structure of the machining cavity of an aspherical optical lens milling device and method according to the present invention; Figure 3 This is a rear view of the internal structure of the machining cavity of an aspherical optical lens milling device and method according to the present invention; Figure 4 This is a partial structural diagram of the drain outlet of the aspherical optical lens milling equipment and method of the present invention; Figure 5 This is a schematic diagram of the internal structure of the liquid tank in the aspherical optical lens milling equipment and method of the present invention; Figure 6 This is a partial structural diagram of the vacuum chuck and flexible inner bladder of an aspherical optical lens milling equipment and method according to the present invention. Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0021] 101. Machine body; 102. Milling cutter; 103. Liquid tank; 104. Machining cavity; 105. Control panel; 106. Machining spindle; 107. Limiting bar; 108. Sealing gasket; 109. Limiting frame; 110. Corrugated section; 111. Threaded rod; 112. Gear motor; 113. Stand; 114. Work slide; 115. Drainage trough; 116. Hydraulic lifting platform; 117. Guide frame; 118. Rewinding chamber; 119. Servo motor; 120. Inner support plate; 121. Parabolic reflector; 122. Drain outlet; 123. Motor compartment; 124. Electric telescopic rod; 125. Sealing plate; 126. Vacuum suction cup; 127. Flexible inner bladder; 128. Lead screw; 129. Fixing bar; 130. Slider; 131. Slide groove; 132. Positioning roller. Detailed Implementation

[0022] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0023] like Figures 1-7 The aspherical optical lens milling equipment shown includes a machine body 101 and a parabolic reflective lens 121. A machining cavity 104 is provided inside the machine body 101. A hydraulic lifting platform 116 is installed on the bottom front side of the machining cavity 104. A working slide 114 is installed on the top working end of the hydraulic lifting platform 116. A stand 113 is installed on the top moving part of the working slide 114. A machining spindle 106 is installed on one side inside the machine body 101. A milling cutter 102 is installed on the driving end of the machining spindle 106. The milling cutter 102 is used to mill the edges of the parabolic reflective lens 121. The front end of the machine body 101... A control panel 105 is installed on the upper part of one side. The control panel 105 is used to control other electrical control equipment. The vacuum suction cup 126 and the flexible inner bladder 127 are respectively set on both sides of the parabolic reflector 121. The side of the vacuum suction cup 126 away from the parabolic reflector 121 is connected to a vacuum pump through a connecting pipe and a rotary joint. The vacuum pump is installed on the bottom side of the processing chamber 104. A liquid replenishment pipe is fixedly connected to the lower rear side of the liquid tank 103. A pump body is installed at the end of the liquid replenishment pipe away from the liquid tank 103. The pump body is installed on the rear side of the processing chamber 104. The input end of the pump body is connected to an external liquid tank. Furthermore, in specific implementation, the parabolic reflector 121 is placed in the liquid tank 103, and the equipment is started through the control panel 105. The hydraulic lifting platform 116 drives the working slide 114 and the stand 113 to rise and fall as a whole. The working slide 114 drives the liquid tank 103 to move laterally, so that the parabolic reflector 121 is aligned with the milling cutter 102 on the machining spindle 106. The machining spindle 106 drives the milling cutter 102 to rotate at high speed to mill the edge of the parabolic reflector 121 exposed above the liquid surface. Through the coordination and adjustment of the hydraulic lifting platform 116 and the working slide 114, the milling cutter 102 can continuously mill the edges of the parabolic reflector 121 at different edge positions.

[0024] The stand 113 has a liquid tank 103 mounted on top. A geared motor 112 is mounted at the middle of both ends of the liquid tank 103. An electric telescopic rod 124 is fixedly connected to the drive end of each geared motor 112. The electric telescopic rod 124 passes through the middle of both ends of the liquid tank 103 and is rotatably connected to the liquid tank 103 via sealed bearings. Vacuum suction cups 126 and inner support plates 120 are respectively mounted on the telescopic ends of the electric telescopic rods 124. A flexible inner bladder 127 is mounted on the inner side of the end of the inner support plate 120 away from the electric telescopic rod 124. An excitation coil is installed inside the liquid tank 103 and filled with electromagnetic rheological fluid. The excitation coil is installed inside the inner support plate 120. The specific installation method adopts existing technology and will not be described in detail here. The top of the liquid tank 103 is set as a corrugated section 110. Limit brackets 109 are installed on the front and rear sides of the top of the corrugated section 110. Servo motors 119 are installed on the lower parts of the front and rear sides of the liquid tank 103. Threaded rods 111 are installed on the top drive end of the servo motors 119. The top of the threaded rods 111 penetrates the top of the corrugated section 110 and is threadedly connected to the top of the corrugated section 110. Furthermore, in specific implementation, the two geared motors 112 drive the corresponding electric telescopic rods 124 to move synchronously towards the center, so that the vacuum suction cup 126 on one side is attached to the planar side of the parabolic reflector 121, and a vacuum suction is formed by the vacuum pump to fix the parabolic reflector 121; the inner support plate 120 on the other side extends into the concave side of the parabolic reflector 121, so that the flexible inner bladder 127 is attached to the inner wall of the parabolic reflector 121. The push of the electric telescopic rod 124 causes the flexible inner bladder 127 to deform and adapt to the parabolic reflector 121 with different curvatures. Then, the excitation coil inside the flexible inner bladder 127 is energized, so that the electromagnetic rheological fluid forms a quasi-solid state, improving the flexibility. The supporting stiffness of the inner bladder 127 provides uniform support to the inner side of the parabolic reflector 121, reducing clamping stress concentration and improving milling stability. The excitation intensity of the excitation coil is adjusted according to the thickness or curvature of the parabolic reflector 121 to change the supporting stiffness of the flexible inner bladder 127. After clamping, the pump body injects machining fluid into the liquid tank 103 through the replenishment pipe. The machining fluid is selected according to the material of the parabolic reflector 121. For aluminum-based parabolic reflectors 121, fully synthetic cutting fluid can be preferred, but semi-synthetic cutting fluid, water-based cutting fluid, or other machining fluids suitable for precision milling can also be used, so that the main body of the parabolic reflector 121 is immersed in the liquid, with only the edge to be machined exposed above the liquid surface.

[0025] Among them, the top two sides of the corrugated section 110 are slidably connected to the sealing plate 125, and the inner side of the sealing plate 125 is inlaid with magnetic strips. The front and rear sides of the liquid tank 103 are equipped with the winding chamber 118. The winding chamber 118 is equipped with the winding roller through the coil spring. The outer circumference of the winding roller is wound with the sealing gasket 108. The end of the sealing gasket 108 away from the winding roller passes through the top of the winding chamber 118. The end of the sealing gasket 108 away from the winding chamber 118 passes through the limiting frame 109 and is slidably connected to the limiting frame 109. The end of the sealing gasket 108 is fixedly connected to the limiting strip 107. The outer side of the sealing gasket 108 is provided with a magnetic coating. The top four parts of the corrugated section 110 are equipped with electromagnets. Furthermore, in specific implementation, the servo motor 119 drives the threaded rod 111 to rotate. The threaded rod 111 engages with the top thread of the corrugated section 110, causing the corrugated section 110 to extend and retract in the vertical direction to adjust the top size of the liquid tank 103. Then, the sealing plate 125 is pushed to slide along the top of the corrugated section 110 to seal the left and right sides of the liquid tank 103. Then, the sealing gasket 108 is pulled to move along the limit frame 109 to seal the front and rear sides of the liquid tank 103. Under the action of the coil spring in the winding chamber 118, the sealing gasket 108 always remains in a taut state. After that, the electromagnet at the top of the corrugated section 110 is activated to form a magnetic field. In conjunction with the magnetic strip on the sealing plate 125 and the magnetic coating on the sealing gasket 108, the sealing plate 125 and the sealing gasket 108 are attracted and fixed, leaving only the opening required for the milling cutter 102 to reduce the splashing and evaporation of the machining fluid, and at the same time, reduce the amount of machining debris falling into the liquid tank 103.

[0026] The liquid tank 103 has fixing strips 129 installed on both sides. Each fixing strip 129 has a groove 131 in the middle. Each groove 131 has a slider 130 slidably connected to the front and rear sides. Each slider 130 has a positioning roller 132 installed in the middle. The positioning roller 132 can be replaced with a grinding roller or a polishing roller according to the processing requirements. Each liquid tank 103 has a motor compartment 123 installed at the lower front and rear sides. Each motor compartment 123 has a stepper motor installed on both sides. Each stepper motor has a lead screw 128 fixedly connected to its drive end. The end of the lead screw 128 away from the motor compartment 123 passes through the side wall of the liquid tank 103 and is rotatably connected to the liquid tank 103 through a sealed bearing. The end of the lead screw 128 away from the motor compartment 123 passes through the slider 130 and is threadedly connected to the slider 130. Furthermore, in specific implementation, when it is necessary to process parabolic reflective lenses 121 of different specifications, the stepper motor in the motor compartment 123 drives the lead screw 128 to rotate. The lead screw 128 drives the slider 130 to move synchronously along the slide groove 131 on the fixed bar 129, so that the positioning rollers 132 move closer or further away from each other, and limit and guide the two sides of the parabolic reflective lens 121, so that the parabolic reflective lenses 121 of different diameters can maintain stable positioning and avoid deviation during milling.

[0027] The hydraulic lifting platform 116 is provided with a drainage trough 115 on the rear side, and an inclined guide frame 117 is installed on the inner side of the upright frame 113. The outlet of the guide frame 117 faces the drainage trough 115. Drainage ports 122 are fixedly connected to both sides of the bottom of the liquid tank 103. The drainage ports 122 all penetrate the top of the upright frame 113 and are all located on the upper side of the guide frame 117.

[0028] Furthermore, in specific implementation, after processing is completed, the processing fluid in the liquid tank 103 and the fine debris generated during processing are discharged through the drain outlet 122 and fall onto the guide frame 117. Under the guiding action of the guide frame 117, they are collected into the drain tank 115, realizing the centralized collection of processing fluid, which facilitates the recycling of processing fluid and equipment cleaning, and improves the continuous processing capacity of the equipment.

[0029] One method for milling aspherical optical lenses includes the following steps: S1. Specification Adjustment: According to the outer diameter of the polished reflective lens 121 to be processed, the stepper motor in the motor compartment 123 is started, and the lead screw 128 is driven to rotate, so that the slider 130 moves synchronously along the groove 131 on the fixed bar 129, and the positioning rollers 132 move closer or further away from each other, so that the distance between the two positioning rollers 132 is adapted to the specifications of the polished reflective lens 121 to be processed. S2, Lens clamping: The polished reflector 121 is placed in the liquid tank 103, so that the polished reflector 121 is positioned between the two positioning rollers 132. The two reduction motors 112 are started, driving the corresponding electric telescopic rods 124 to move synchronously towards the center, so that the vacuum suction cup 126 is attached to the flat side of the polished reflector 121, and a vacuum adsorption is formed by the vacuum pump. At the same time, the inner support plate 120 extends into the concave side of the polished reflector 121, so that the flexible inner bladder 127 is attached to the inner wall of the polished reflector 121, thus achieving the initial fixation of the lens. S3. Establish flexible support: By energizing the excitation coil installed inside the flexible inner bladder 127, the electromagnetic rheological fluid filling the flexible inner bladder 127 changes from a fluid state to a high viscosity state, thereby improving the overall support stiffness of the flexible inner bladder 127 and forming a uniform fit and support between the flexible inner bladder 127 and the inner wall of the parabolic reflective lens 121, thus improving the lens clamping stability. S4. Establish the immersion environment: Processing fluid is injected into liquid tank 103 through replenishment pipe, so that the main body of the polished reflective lens 121 is submerged in processing fluid, with only the edge to be processed exposed above the liquid surface. S5. Processing position adjustment: Start the hydraulic lifting platform 116 to drive the work slide 114 and the stand 113 to lift as a whole. At the same time, the work slide 114 drives the liquid tank 103 to move laterally so that the edge to be processed of the polished reflective lens 121 corresponds to the position of the milling cutter 102 on the processing spindle 106. S6. Sealing of the processing area: The servo motor 119 is started to drive the threaded rod 111 to rotate, causing the corrugated section 110 to extend and retract in the vertical direction to adjust the size of the opening at the top of the liquid tank 103; then the sealing plate 125 is moved and the sealing gasket 108 is moved along the limiting frame 109 to close the unprocessed area at the top of the liquid tank 103, leaving only the opening required for processing by the milling cutter 102; then the electromagnet set at the top of the corrugated section 110 is started, which, together with the magnetic strip on the sealing plate 125 and the magnetic coating on the sealing gasket 108, adsorbs and fixes the sealing plate 125 and the sealing gasket 108. S7. Milling edge processing: Start the machining spindle 106, which drives the milling cutter 102 to rotate at high speed. Through the coordination and adjustment of the hydraulic lifting table 116 and the working slide 114, the milling cutter 102 moves continuously along the edge of the parabolic reflector 121 to mill the edge exposed above the liquid surface until the entire edge is machined. S8. Drainage recovery: After milling is completed, the sealing plate 125 and the sealing gasket 108 are released from the liquid tank 103, the operation of the machining spindle 106 is stopped, and the machining fluid and machining debris in the liquid tank 103 are discharged through the drain port 122 and flow into the drainage tank 115 along the guide frame 117 for centralized collection. Then, the excitation state of the flexible inner bladder 127 is released, so that the electromagnetic rheological fluid returns to its flow state, the electric telescopic rod 124 is driven to retract, the vacuum chuck 126 is released from the adsorption of the parabolic reflector 121, and the unloading of the lens is completed.

[0030] Working principle: In practical use, the polished reflector 121 is first placed in the liquid tank 103. The two geared motors 112 drive the corresponding electric telescopic rods 124 to move synchronously towards the center, causing the vacuum suction cup 126 on one side to adhere to the outer surface of the polished reflector 121. A vacuum pump then creates a vacuum suction to fix the planar side of the polished reflector 121. The inner support plate 120 on the other side extends into the concave side of the polished reflector 121, causing the flexible inner bladder 127 mounted on the inner support plate 120 to adhere to the inner wall of the polished reflector 121. The operation of the electric telescopic rod 124 on this side allows the flexible inner bladder 127 to fit tightly against the concave side of the polished reflector 121. Simultaneously, the compressive force causes the flexible inner bladder 127 to deform and expand outwards, making it suitable for use with non-concave surfaces. A parabolic reflector 121 with the same concave curvature and dimensions is then used. An excitation coil inside a flexible inner bladder 127 is energized, causing the electromagnetic rheological fluid filling the bladder to solidify. This increases the overall support stiffness of the inner bladder 127 and creates a large-area, uniform fit with the inner wall of the parabolic reflector 121. This ensures clamping stability while reducing local clamping stress, maintaining the parabolic reflector 121's stability during milling. During edge milling, this avoids stress concentration or uneven edge vibration due to the thin concave edge of the parabolic reflector 121, preventing edge chipping and improving milling quality. After the parabolic reflector 121 is clamped, the pump injects processing fluid into the liquid tank 103 through a replenishment pipe. The main body of the parabolic reflector 121 is submerged in the liquid, with only the top edge to be processed exposed above the liquid surface. The liquid continuously absorbs the heat generated during the processing of the parabolic reflector 121 and provides buoyancy support to the main body of the parabolic reflector 121, reducing deformation caused by its own weight and processing temperature rise, and improving dimensional stability during the milling process. After the above actions are completed, the hydraulic lifting platform 116 drives the working slide 114 and the upper liquid tank 103 to rise and fall as a whole. The working slide 114 drives the liquid tank 103 to move laterally, so that the parabolic reflector 121 is aligned with the milling cutter 102 on the machining spindle 106. The machining spindle 106 drives the milling cutter 102 to rotate at high speed, exposing the parabolic reflector 121 to the liquid surface. The edges of the surface are milled. The milling cutter 102 is adjusted via the hydraulic lifting platform 116 and the working slide 114 to continuously mill the edges of the parabolic reflector 121 at different edge positions. A servo motor 119 drives the threaded rod 111 to rotate. The threaded rod 111 engages with the top thread of the corrugated section 110, causing the corrugated section 110 to extend and retract vertically, adjusting the opening size at the top of the liquid tank 103. Simultaneously, the operator pushes the sealing plates 125 located on both sides of the top of the corrugated section 110 to seal the left and right sides of the top of the liquid tank 103. Then, the operator pulls the sealing gasket 108 to seal the front and rear sides of the top of the liquid tank 103. During this process, a coil spring inside the take-up chamber 118 continuously drives the take-up roller to take up the sealing gasket 108.The sealing gasket 108 is kept taut at all times, together with the sealing plate 125, sealing the unprocessed area at the top of the liquid tank 103, leaving only the opening required for the milling cutter 102 to process. Then, by activating the electromagnet at the top of the corrugated section 110, a strong magnetic field is generated, achieving the adsorption and fixation of the sealing plate 125 and the sealing gasket 108. This ensures normal processing by the milling cutter 102 while reducing splashing and evaporation of the processing fluid and minimizing the amount of processing debris falling into the liquid tank 103, thus improving the sealing of the processing area. During actual processing, the stepper motor in the motor housing 123 drives the lead screw 128 to rotate. The lead screw 128 drives the slider 130 to move synchronously along the groove 131 on the fixing bar 129, causing the positioning rollers 132 mounted on the slider 130 to move closer or further apart, limiting and guiding the parabolic reflector 121 on both sides, ensuring that parabolic reflectors 121 of different diameters can maintain stable positioning and avoid... During the milling-free process, misalignment occurs, adapting to different specifications of parabolic reflective lenses 121. After processing, the processing fluid is discharged through the drain outlets 122 on both sides of the bottom of the fluid tank 103 and falls onto the inclined guide frame 117. Under the guiding action of the guide frame 117, it collects into the drain tank 115, realizing centralized collection of the processing fluid, facilitating the recycling of the processing fluid and equipment cleaning, and improving the continuous processing efficiency of the equipment. In addition, by adjusting the energizing state of the excitation coil inside the flexible inner bladder 127, the rheological properties of the electromagnetic rheological fluid can be changed, allowing the flexible inner bladder 127 to form different support stiffnesses, thereby adapting to parabolic reflective lenses 121 of different thicknesses and specifications. While ensuring stable support of the lens, it reduces stress concentration generated during clamping, further improving the edge processing stability of the parabolic reflective lens 121, reducing processing errors, and improving edge contour accuracy, dimensional consistency, and processing stability.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An aspherical optical lens milling device, comprising a body (101) and a parabolic reflective lens (121), characterized in that: The machine body (101) has a processing chamber (104) inside. A hydraulic lifting platform (116) is installed on the front bottom side of the processing chamber (104). A working slide (114) is installed on the top working end of the hydraulic lifting platform (116). A stand (113) is installed on the top moving part of the working slide (114). A liquid tank (103) is installed on the top of the stand (113). A reduction motor (112) is installed in the middle of both ends of the liquid tank (103). An electric telescopic rod (124) is fixedly connected to the drive end of each reduction motor (112). The electric telescopic rods (124) all penetrate the middle of both ends of the liquid tank (103) and are rotatably connected to the liquid tank (103) through sealed bearings. Vacuum suction cups (126) and inner support plates (120) are respectively installed at the telescopic ends of the electric telescopic rods (124) on both sides. A flexible inner bladder (127) is installed on the inner side of the end of the inner support plate (120) away from the electric telescopic rod (124). An excitation coil is provided inside the flexible inner bladder (127) and it is filled with electromagnetic rheological fluid. The top of the liquid tank (103) is set as a corrugated section (110). The top of the corrugated section (110) is... Limiting frames (109) are installed on both the front and rear sides of the liquid tank (103). Servo motors (119) are installed on the lower parts of both the front and rear sides of the liquid tank (103). Threaded rods (111) are installed on the top drive ends of the servo motors (119). The top of the threaded rods (111) passes through the top of the corrugated section (110) and is threadedly connected to the top of the corrugated section (110). Sealing plates (125) are slidably connected to both sides of the top of the corrugated section (110). Magnetic strips are embedded in the inner side of the sealing plates (125). Rewinding bins (118) are installed in the middle of both the front and rear sides of the liquid tank (103). Inside each of the take-up bins (118), a take-up roller is installed via a coil spring. Each take-up roller is wrapped with a sealing gasket (108). The end of the sealing gasket (108) away from the take-up roller passes through the top of the take-up bin (118). The end of the sealing gasket (108) away from the take-up bin (118) passes through the limiting frame (109) and is slidably connected to the limiting frame (109). The end of each sealing gasket (108) is fixedly connected to a limiting strip (107). Each sealing gasket (108) is provided with a magnetic coating. Each of the four top parts of the corrugated section (110) is equipped with an electromagnet.

2. The aspherical optical lens milling equipment according to claim 1, characterized in that: A machining spindle (106) is installed on one side of the machine body (101), and a milling cutter (102) is installed on the drive end of the machining spindle (106). The milling cutter (102) is used to mill the edge of the parabolic reflector (121).

3. The aspherical optical lens milling equipment according to claim 1, characterized in that: A control panel (105) is installed on the upper part of one side of the front end of the body (101), and the control panel (105) is used to control the other electrical control equipment.

4. The aspherical optical lens milling equipment according to claim 1, characterized in that: A drainage trough (115) is provided on the rear side of the hydraulic lifting platform (116), and an inclined guide frame (117) is installed on the inner side of the upright frame (113), with the outlet of the guide frame (117) facing the drainage trough (115).

5. The aspherical optical lens milling equipment according to claim 1, characterized in that: A replenishing pipe is fixedly connected to the lower rear side of the liquid tank (103). A pump body is installed at the end of the replenishing pipe away from the liquid tank (103). The pump body is installed inside the rear side of the processing cavity (104). An external liquid tank is connected to the input end of the pump body.

6. The aspherical optical lens milling equipment according to claim 1, characterized in that: The liquid tank (103) has drain outlets (122) fixedly connected to both sides of the bottom. The drain outlets (122) all penetrate the top of the stand (113) and are located on the upper side of the guide frame (117).

7. The aspherical optical lens milling equipment according to claim 1, characterized in that: The vacuum suction cup (126) and the flexible inner bladder (127) are respectively disposed on both sides of the parabolic reflector (121). The side of the vacuum suction cup (126) away from the parabolic reflector (121) is connected to a vacuum pump through a connecting pipe and a rotary joint. The vacuum pump is installed on the bottom side of the processing chamber (104).

8. The aspherical optical lens milling equipment according to claim 1, characterized in that: Fixed strips (129) are installed on both sides of the liquid tank (103). A sliding groove (131) is opened in the middle of the fixed strip (129). A slider (130) is slidably connected to the front and rear sides of the sliding groove (131). A positioning roller (132) is installed in the middle of the slider (130) on both sides. A motor compartment (123) is installed at the lower front and rear sides of the liquid tank (103). A stepper motor is installed on both sides of the motor compartment (123). A lead screw (128) is fixedly connected to the drive end of the stepper motor.

9. The aspherical optical lens milling equipment according to claim 8, characterized in that: The end of the lead screw (128) away from the motor compartment (123) passes through the side wall of the liquid tank (103) and is rotatably connected to the liquid tank (103) through a sealed bearing. The end of the lead screw (128) away from the motor compartment (123) passes through the slider (130) and is threadedly connected to the slider (130).

10. A method for milling aspherical optical lenses, applied to the aspherical optical lens milling equipment described in any one of claims 1-9, characterized in that: The following steps are included: S1. Specification Adjustment: According to the outer diameter of the polished reflective lens (121) to be processed, start the stepper motor in the motor compartment (123) to drive the lead screw (128) to rotate, so that the slider (130) moves synchronously along the groove (131) on the fixed bar (129), and drive the positioning rollers (132) to move closer or further away from each other, so that the distance between the two positioning rollers (132) is adapted to the specifications of the polished reflective lens (121) to be processed; S2, Lens clamping: The parabolic reflector (121) is placed in the liquid tank (103) and positioned between the two positioning rollers (132). The two geared motors (112) are started to drive the corresponding electric telescopic rods (124) to move synchronously to the center, so that the vacuum suction cup (126) is attached to the flat side of the parabolic reflector (121) and a vacuum adsorption is formed by the vacuum pump. At the same time, the inner support plate (120) extends into the concave side of the parabolic reflector (121) so that the flexible inner bladder (127) is attached to the inner wall of the parabolic reflector (121) to achieve the initial fixation of the lens. S3. Establish flexible support: By energizing the excitation coil inside the flexible inner bladder (127), the electromagnetic rheological fluid filled inside the flexible inner bladder (127) changes from a fluid state to a high viscosity state, thereby increasing the overall support stiffness of the flexible inner bladder (127) and forming a uniform fit support between the flexible inner bladder (127) and the inner wall of the parabolic reflector (121), thus improving the stability of the lens clamping. S4. Establish the immersion environment: Processing fluid is injected into the liquid tank (103) through the replenishment pipe, so that the main body of the polished reflective lens (121) is immersed in the processing fluid, with only the edge to be processed exposed above the liquid surface; S5. Processing position adjustment: Start the hydraulic lifting platform (116) to drive the work slide (114) and the stand (113) to lift as a whole. At the same time, the work slide (114) drives the liquid tank (103) to move laterally so that the edge to be processed of the parabolic reflector (121) is aligned with the milling cutter (102) on the machining spindle (106). S6. Sealing of the processing area: Start the servo motor (119) to drive the threaded rod (111) to rotate, causing the corrugated section (110) to extend and retract in the vertical direction to adjust the opening size at the top of the liquid tank (103); then move the sealing plate (125) and move the sealing gasket (108) along the limit frame (109) to close the unprocessed area at the top of the liquid tank (103), leaving only the opening required for milling cutter (102) to process; then start the electromagnet set at the top of the corrugated section (110) to attract and fix the sealing plate (125) and sealing gasket (108); S7. Milling edge processing: Start the machining spindle (106) to drive the milling cutter (102) to rotate at high speed. Through the coordination and adjustment of the hydraulic lifting table (116) and the working slide (114), the milling cutter (102) moves continuously along the edge of the parabolic reflector (121) to mill the edge exposed on the liquid surface until the entire edge is machined. S8. Drainage recovery: After milling is completed, the sealing plate (125) and the sealing gasket (108) are released from the liquid tank (103), the machining spindle (106) is stopped, and the machining fluid and machining debris in the liquid tank (103) are discharged through the drain (122) and flow into the drainage tank (115) along the guide frame (117) for centralized collection. Then, the excitation state of the flexible inner bladder (127) is released, the electromagnetic rheological fluid is restored to its flow state, the electric telescopic rod (124) is driven to retract, the vacuum chuck (126) is released from the adsorption of the parabolic reflector (121), and the lens is unloaded.

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