Thermal forming mold for optical glass

Abstract

The utility model discloses an optical glass thermal forming die which comprises a die base, a plurality of forming cylinders are fixedly connected to the top of the die base, heat insulation cylinders are arranged outside the forming cylinders, magnetic coils are arranged between the heat insulation cylinders and the forming cylinders, and a PLC is fixedly connected to the surface of one side of the die base. A wire of the magnetic coil is connected with an oscillator in the PLC, a vertical frame is fixedly connected to the top of one side of the mold base, a connecting plate is fixedly connected to the bottom of one end of the vertical frame, a first steering engine is fixedly connected to the bottom of the connecting plate, a shell is arranged on the outer side of the first steering engine, and the output end of the first steering engine is connected with the shell. According to the utility model, the forming cylinder and a glass material can be uniformly heated, so that the glass material cannot be adhered in the forming cylinder, the heating efficiency is improved, and the surface shape precision of a glass finished product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical glass forming molds, in particular to an optical glass hot forming mold. Background Art

[0002] Optical glass is a glass material that can change the direction of light propagation and alter the relative spectral distribution of ultraviolet, visible, or infrared light. It has a wide range of applications in the optical field and is an important material for manufacturing key components such as lenses, prisms, reflectors, and windows in optical instruments.

[0003] After searching Chinese patent CN216890627U, a hot pressing mold heating device for optical glass was found, which includes a high-frequency power transformer, a tubular metal conductor, a workbench and a heating mold. The metal conductor is wound around the periphery of the hot pressing mold, and one end of the metal conductor is connected to the current output port of the high-frequency power transformer, and the other end is connected to the current loop port of the high-frequency power transformer; the metal conductor and the hot pressing mold are fixed on the workbench.

[0004] The above technology uses electromagnetic induction heating technology to heat the hot pressing mold to increase the mold heating speed. However, the structure is heated unevenly, and the heating efficiency of the side close to the hot pressing mold is lower than the side close to the metal conductor, causing the glass material to stick to the hot pressing mold. In addition, the product is prone to air holes and cold mold marks, making it difficult to obtain the ideal shape and surface accuracy. Utility Model Content

[0005] The purpose of the present invention is to provide an optical glass thermoforming mold to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an optical glass thermoforming mold, comprising a mold base, wherein a plurality of forming cylinders are fixedly connected to the top of the mold base, and an insulating cylinder is provided on the outside of the plurality of forming cylinders, and a magnetic coil is provided between the insulating cylinder and the forming cylinder. A PLC controller is fixedly connected to the surface of one side of the mold base, and the wire of the magnetic coil is connected to the oscillator in the PLC controller.

[0007] As a further preferred embodiment of the present technical solution, the top of one side of the mold base is fixedly connected to a stand, the bottom of one end of the stand is fixedly connected to a connecting plate, the bottom of the connecting plate is fixedly connected to a first servo, a shell is provided on the outside of the first servo, and the output end of the first servo is connected to the shell.

[0008] As a further preferred embodiment of the present technical solution, a second servo is fixedly connected to the interior of the bottom of the shell, an output end of the second servo is fixedly connected to a connecting block, the connecting block is rotatably connected to the interior of the shell, and a spectroscopic pyrometer is fixedly connected to the bottom of the connecting block.

[0009] As a further preferred embodiment of the present technical solution, a connecting rod is movably connected to the interior of the bottom of the mold base, one end of the connecting rod is fixedly connected to a horizontal plate, and the other end of the connecting rod is connected to an output end of an external hydraulic cylinder.

[0010] As a further preferred embodiment of the present technical solution, the horizontal plate is arranged at the bottom inside the mold base, and a plurality of ejector rods are fixedly connected to the top of the horizontal plate, and one end of each of the ejector rods is fixedly connected to an ejector plate, and the ejector plate is arranged inside a nearby molding cylinder, and the outer wall of the ejector plate is tightly fitted into the inner wall of the molding cylinder.

[0011] As a further preferred embodiment of the present technical solution, a mold spring is provided on the outer side of each of the ejector pins, and both ends of the mold spring are respectively fixed to the top of the transverse plate and the inner top wall of the mold seat.

[0012] As a further preferred embodiment of this technical solution,

[0013] The utility model provides an optical glass thermoforming mold, which has the following beneficial effects:

[0014] (1) The utility model is provided with a magnetic coil outside each forming cylinder, which can evenly heat the forming cylinder and the glass material, so that the glass material will not stick to the forming cylinder, thereby improving the heating efficiency and the surface accuracy of the finished glass product.

[0015] (2) The ejector plate of the utility model ejects the formed optical glass and can apply a uniform ejection force to the bottom surface of the optical glass. The optical glass is not easily deformed during ejection and no ejection marks are left on the bottom surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the installation structure of the spectrum pyrometer of the present utility model;

[0018] Figure 3 This is a schematic cross-sectional structural diagram of the mold base of the present invention.

[0019] In the figure: 1. mold base; 2. molding cylinder; 3. magnetic coil; 4. thermal insulation cylinder; 5. PLC controller; 6. stand; 7. spectrum pyrometer; 8. connecting plate; 9. first servo; 10. housing; 11. second servo; 12. connecting block; 13. connecting rod; 14. cross plate; 15. ejector rod; 16. mold spring; 17. ejector plate. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] The utility model provides a technical solution: Figure 1-Figure 3 As shown in the embodiment, an optical glass thermoforming mold includes a mold base 1, a plurality of forming cylinders 2 are fixedly connected to the top of the mold base 1, and a heat insulating cylinder 4 is provided on the outside of the plurality of forming cylinders 2. A magnetic coil 3 is provided between the heat insulating cylinder 4 and the forming cylinder 2. A PLC controller 5 is fixedly connected to the surface of one side of the mold base 1, and the wire of the magnetic coil 3 is connected to the oscillator in the PLC controller 5. The forming cylinder 2 is made of alloy steel, specifically one of martensitic stainless steel or ferritic stainless steel. The material properties of the steel are ferromagnetic and can be heated by the magnetic coil 3. When the glass is formed, the glass is firstly placed on the mold base 1. The glass material is placed in the forming tube 2, and the oscillator is started through the PLC controller 5, which converts direct current into alternating current of different frequencies. These high-frequency alternating currents generate high-frequency magnetic lines of force in the magnetic coil 3. The forming tube 2 is inside the magnetic coil 3, which will cut the magnetic lines of force, thereby generating eddy currents. The eddy currents generate Joule heat, which causes the temperature of the forming tube 2 to rise instantaneously, thereby heating the glass material in the forming tube 2. The glass material and the forming tube 2 are heated together to near the softening point of the glass. When the glass material and the forming tube 2 are at roughly the same temperature, the glass can be formed by applying pressure to the glass and cooling it using the upper mold base.

[0022] The top of one side of the mold base 1 is fixedly connected to a stand 6, the bottom of one end of the stand 6 is fixedly connected to a connecting plate 8, the bottom of the connecting plate 8 is fixedly connected to a first servo 9, a shell 10 is provided on the outside of the first servo 9, and the output end of the first servo 9 is connected to the shell 10.

[0023] A second servo 11 is fixedly connected to the interior of the bottom of the housing 10, and a connecting block 12 is fixedly connected to the output end of the second servo 11. The connecting block 12 is rotatably connected to the interior of the housing 10. The bottom of the connecting block 12 is fixedly connected to the spectrum pyrometer 7. When the first servo 9 is started, the housing 10 is driven to rotate, thereby adjusting the Y-axis direction of the output end of the spectrum pyrometer 7. When the second servo 11 is started, the connecting block 12 can be driven to rotate in the housing 10, thereby adjusting the Z-axis direction of the output end of the spectrum pyrometer 7 to monitor the temperature in each molding cylinder 2. The first servo 9, the second servo 11 and the spectrum pyrometer 7 are all connected to the PLC controller 5 via wires and are controlled by the PLC controller 5.

[0024] A connecting rod 13 is movably connected to the bottom of the mold base 1. One end of the connecting rod 13 is fixedly connected to a horizontal plate 14, and the other end of the connecting rod 13 is connected to the output end of the external hydraulic cylinder.

[0025] The horizontal plate 14 is arranged at the bottom inside the mold base 1, and a plurality of ejector rods 15 are fixedly connected to the top of the horizontal plate 14. One end of each of the ejector rods 15 is fixedly connected to an ejector plate 17. The ejector plate 17 is arranged inside the adjacent forming cylinder 2, and the outer wall of the ejector plate 17 is tightly fitted into the inner wall of the forming cylinder 2. The connecting rod 13 is pushed by the external hydraulic cylinder to move inside the bottom of the mold base 1, and then the horizontal plate 14 drives the ejector rod 15 to move upward, and the ejector plate 17 pushes out the optical glass that has been formed in the forming cylinder 2. Since the optical glass is formed on the upper surface of the ejector plate 17, the ejection force applied by the ejector plate 17 to the bottom surface of the optical glass is relatively uniform. The optical glass is not easily deformed during ejection, and no ejection marks will be left on the bottom surface.

[0026] A mold spring 16 is provided on the outside of the push rod 15. The two ends of the mold spring 16 are respectively fixed to the top of the cross plate 14 and the inner top wall of the mold base 1. During the pressure processing of the die or hydraulic press, the mold spring 16 can buffer the impact force, reduce equipment and mold wear, and extend service life.

[0027] The utility model provides an optical glass hot forming mold, the specific working principle of which is as follows: first, glass material is placed in a forming cylinder 2, and an oscillator is started by a PLC controller 5, which converts direct current into alternating current of different frequencies. These high-frequency alternating currents generate high-frequency magnetic lines of force in a magnetic coil 3. The forming cylinder 2 is inside the magnetic coil 3 and cuts the magnetic lines of force, thereby generating eddy currents. The eddy currents generate Joule heat, which causes the temperature of the forming cylinder 2 to rise instantaneously, thereby heating the glass material in the forming cylinder 2. During the heating period, the first servo 9 and the second servo 11 control the direction angle of the spectroscopic pyrometer 7 to monitor the temperature in each forming cylinder 2, and heat the glass material and the forming cylinder 2 together to near the softening point of the glass. When the glass material and the forming cylinder 2 are at approximately the same temperature, the upper mold base is used to apply pressure to the glass and cool it to form the glass. Finally, an external hydraulic cylinder pushes the connecting rod 13 to move inside the bottom of the mold base 1, thereby causing the cross plate 14 to drive the ejector rod 15 to move upward, and the ejector plate 17 pushes the optical glass formed in the forming cylinder 2 out.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical glass thermoforming mold, comprising a mold base (1), characterized in that: The top of the mold base (1) is fixedly connected to a plurality of molding cylinders (2), and the outside of the plurality of molding cylinders (2) is provided with a heat insulation cylinder (4), and a magnetic coil (3) is provided between the heat insulation cylinder (4) and the molding cylinder (2). A PLC controller (5) is fixedly connected to a surface of one side of the mold base (1), and the wire of the magnetic coil (3) is connected to an oscillator in the PLC controller (5).

2. The optical glass thermoforming mold according to claim 1, characterized in that: The top of one side of the mold base (1) is fixedly connected to a stand (6), the bottom of one end of the stand (6) is fixedly connected to a connecting plate (8), the bottom of the connecting plate (8) is fixedly connected to a first steering gear (9), a housing (10) is provided on the outside of the first steering gear (9), and an output end of the first steering gear (9) is connected to the housing (10).

3. The optical glass thermoforming mold according to claim 2, characterized in that: A second steering gear (11) is fixedly connected to the interior of the bottom of the housing (10), an output end of the second steering gear (11) is fixedly connected to a connecting block (12), the connecting block (12) is rotatably connected to the interior of the housing (10), and a spectroscopic pyrometer (7) is fixedly connected to the bottom of the connecting block (12).

4. The optical glass thermoforming mold according to claim 1, characterized in that: The bottom of the mold base (1) is movably connected to a connecting rod (13), one end of the connecting rod (13) is fixedly connected to a transverse plate (14), and the other end of the connecting rod (13) is connected to the output end of an external hydraulic cylinder.

5. The optical glass thermoforming mold according to claim 4, characterized in that: The transverse plate (14) is arranged at the bottom inside the mold base (1), and a plurality of ejector rods (15) are fixedly connected to the top of the transverse plate (14). One end of each of the ejector rods (15) is fixedly connected to an ejector plate (17). The ejector plate (17) is arranged inside a nearby molding cylinder (2), and the outer wall of the ejector plate (17) is tightly attached to the inner wall of the molding cylinder (2).

6. The optical glass thermoforming mold according to claim 5, characterized in that: A mold spring (16) is provided on the outer side of the ejector rod (15), and the two ends of the mold spring (16) are respectively fixed to the top of the transverse plate (14) and the inner top wall of the mold base (1).

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