CN107599458B - Non-isothermal hot-press molding device and method for composite micro-aspheric lens array - Google Patents
Non-isothermal hot-press molding device and method for composite micro-aspheric lens array Download PDFInfo
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Abstract
The invention discloses a non-isothermal hot press molding device for a composite micro-aspheric lens array, which sequentially comprises the following components from top to bottom: the heating device is arranged in the upper machine base and used for heating the upper template, a microstructure thin net is arranged between the microstructure mold core and the lower template, and the hydraulic driving device is connected with the controller through a circuit. The invention also discloses a non-isothermal hot press molding method of the composite micro-aspheric lens array. The invention adopts the microstructure mold core and the microstructure thin net, and can control the forming effect of the composite micro-prism lens array by controlling the temperature, the hot-pressing pressure, the pressure maintaining time, the aperture of the microstructure thin net, the line diameter of the microstructure thin net and the tension, thereby being capable of forming the composite micro-aspheric lens array by one-time non-isothermal hot-pressing. The composite micro-aspheric lens array is in spatial periodic distribution, flexible in size control, high in processing efficiency, low in cost and suitable for large-area mass production.
Description
Technical Field
The invention relates to a microstructure hot-press molding device and method, in particular to a composite micro-aspheric lens array non-isothermal hot-press molding device and method.
Background
The microstructure is widely applied to the fields of super-hydrophobic-super-hydrophilic surfaces, micro-fluidic chips, heat exchangers, light guide plates and the like. The chemical etching microstructure has corrosivity, the forming precision of the laser processing microstructure is low, the micro grinding microstructure can ensure the forming precision of the microstructure, but the efficiency is low, and the micro grinding microstructure is not suitable for mass production; the microstructure is precisely formed on the surface of the mold core by adopting a micro-grinding technology, and then the surface microstructure is copied on the surface of low-melting-point (softening-point) materials such as polymers and the like by utilizing a hot pressing technology, so that the mass production of the microstructure can be realized. Wu Cheng Hsien adopts an isothermal hot pressing method to process a micro-dot array with the height of 23-24 mu m on the surface of PMMA, the whole workpiece needs to be hot-melted during hot pressing, and the molding time needs to be 30-60s at least. In addition, more functional characteristics can be obtained by processing a finer microstructure array on the surface of the microstructure, so that high value-added products are developed. For example, the composite microstructure can further increase the surface area on the surface of the original microstructure, enhance the heat exchange capability of the surface of a heat exchanger, increase the super-hydrophobic-super-hydrophilic performance of the surface, and improve the brightness and uniformity of the light guide plate. The composite micro-aspheric lens array has the functions of controlling the focusing of light rays with specific wavelengths, enhancing the diffuse reflection of the light rays with the specific wavelengths, reducing the total surface reflection and the like, and a method for quickly forming the composite micro-aspheric lens array at one time is not available at present. The molding speed can be improved by non-isothermal hot pressing, but the molded microstructure is a single plane microstructure at present. If the micro-nano structure corresponding to the micro-aspheric lens array is processed on the surface of the mold core and then the non-isothermal hot-pressing micro-forming is carried out, the processing time is long and the cost is high. If the composite micro-aspheric lens array is formed by hot pressing twice, the position control precision is difficult to achieve, and the processing time is long.
Chinese patent No. ZL 201210560978.4 discloses a method for preparing a superhydrophobic surface with a composite microstructure, wherein the primary and secondary structures of the formed composite structure are planar microstructures, and a molten high polymer material is injected into an injection mold cavity by using an injection molding machine, and then the pressure is maintained at high pressure, and then the composite structure is cooled to below a melting point, and the molding is performed for a long time.
Chinese patent No. ZL 201010109225.2 discloses a method for preparing a polymer superhydrophobic surface using a screen template method: the microstructured array of screens was replicated onto a polymer surface to create a superhydrophobic surface. However, the method cannot realize the preparation of the composite microstructure by using a single micron structure on the template.
Disclosure of Invention
The present invention is directed to a non-isothermal hot press molding apparatus and method for forming a composite micro-aspheric lens array. Aims at fast and efficiently hot-pressing and molding the composite micro-aspheric lens array at one time. The working principle is as follows: the workpiece and the microstructure thin net are contacted with a heated microstructure die core, heat is conducted to the workpiece by the die core, the temperature of the surface material of the workpiece gradually exceeds the softening point of the workpiece to be in a semi-molten state, a semi-molten material is extruded into a die core microstructure concave cavity through the microstructure thin net meshes, a V-shaped die core microstructure concave cavity control material is subjected to hot-press molding of a micro-prism lens array, and the microstructure thin net after elastic deformation is controlled on the surface of the micro-prism array to form a composite micro-aspheric lens array.
The invention is realized by the following technical scheme:
the utility model provides a non-isothermal hot briquetting device of compound little aspheric lens array, includes from top to bottom in proper order: the heating device is arranged in the upper machine base and used for heating the upper template, a microstructure thin net is arranged between the microstructure mold core and the lower template, and the hydraulic driving device is connected with the controller through a circuit.
Furthermore, two ends of the microstructure thin net are tensioned through a tensioning device provided with a tensioning wheel, and the tensioning device is fixed on the lower machine base.
Furthermore, the microstructure thin net is made of nylon fiber material, the pore size range is 200-500 meshes, the softening point is 200-220 ℃, and the wire diameter is 0.1-20 μm.
Further, the material of the microstructure mold core is mold steel, stainless steel or metal alloy.
A composite micro-aspheric lens array non-isothermal hot press molding method based on the device comprises the following steps:
1) placing a workpiece on a lower template, placing the microstructure thin net at a position 0-50mm above the workpiece, and tensioning the microstructure thin net by a tensioning device by adjusting the relative positions of a left tensioning wheel and a right tensioning wheel;
2) the heating device raises the temperature of the microstructure mold core to be above the softening point of the workpiece;
3) the controller enables the hydraulic driving device to drive the hydraulic cylinder to act on the lower machine base, so that the workpiece and the microstructure thin net are in contact with the heated microstructure mold core, heat is conducted to the workpiece through the microstructure mold core, the temperature of the surface material of the workpiece gradually exceeds the softening point of the surface material and becomes a semi-molten state, the semi-molten material is extruded into a microstructure concave cavity of the microstructure mold core through meshes of the microstructure thin net, the V-shaped micro-groove structure concave cavity of the microstructure mold core controls the material to be hot-pressed to form a micro-prism lens array, and the microstructure thin net after elastic deformation controls the surface of the micro-prism lens array to form a composite micro-;
4) maintaining the pressure for 0.1-5s, directly demoulding, naturally cooling the workpiece and taking out.
Furthermore, the height of the compound micro-aspheric lens array is along the micro-prism lensGradually decreasing from top to bottom; the molding height h of the micro prismatic lens array and the molding height h of the composite micro aspheric lens array molded on the top of the micro prismatic lens array*Determined by the following equation:
h＝10.575p-0.435T-1.097t0.009sr-1.115(1)
h*＝-28.235p0.454T5.874t0.156s2.481r-2.003f0.092(2)
wherein p represents a hot pressing pressure in MPa; t represents the temperature of the mold core; t represents the dwell time in units of s; s represents the wire diameter of the microstructure thin net, and the unit is mum; r represents the pore size of the microstructure thin web in μm; f represents the microstructure web tension in N.
Further, the second order axisymmetric surface profile shape of the micro-aspheric lens array can be obtained by the following formula:
h*＝Ar2(3)
a is the aspheric lens quadratic term coefficient.
Further, the characteristic size range of the microstructure mold core is 1-1000 μm;
further, the heating temperature of the micro-structure mold core is higher than the softening point of the workpiece and lower than the viscous state transition temperature of the workpiece; the hot pressing pressure is 0.1-18 MPa.
Further, the tensioning force of the tensioning device is 0.1-50N.
The invention controls the forming effect of the composite micro-prism lens array by the temperature of the micro-structure mold core, the hot pressing pressure, the pressure maintaining time, the aperture of the micro-structure thin net, the line diameter of the micro-structure thin net and the tension.
After demoulding, the workpiece can be directly taken down from the lower part of the microstructure thin net, then the workpiece is naturally cooled, and the microstructure thin net can be recycled for multiple times.
During the hot-press molding process, the temperature of the microstructure mold core is preferentially adjusted; the adjustment factors considered in the second step are the line diameter of the microstructure thin net, the aperture of the microstructure thin net, the hot pressing pressure, the pressure maintaining time and the tension of the thin net in turn. A large aspect ratio micro aspherical lens can be obtained in the following cases: the aperture of the microstructure thin net is 200 meshes and 500 meshes, and the hot pressing pressure and the pressure holding time are smaller when the hot pressing temperature is higher or higher when the hot pressing temperature is lower.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention hot melts workpiece surface material while pressing the workpiece without causing macro-scale thermal deformation of the solid polymer workpiece. In addition, compared with injection molding and isothermal hot pressing, the method does not need time for preheating and hot melting the whole workpiece and cooling the workpiece on line, thereby greatly shortening the period.
2. The size of the composite micro-aspheric lens array can be easily controlled by controlling the aperture of the micro-structure thin net, the temperature of the micro-structure mold core, the pressure maintaining time, the pressure maintaining pressure, the tension of the micro-structure thin net and the linear diameter.
3. The method can mold the composite micro-aspheric lens array structure at one time, has higher molding precision and stronger controllability compared with a method of molding twice, and saves time.
4. The composite micro-aspheric lens array is distributed in a spatial periodic rule, and the top of the micro-aspheric lens array faces the vertical upward direction.
Drawings
Fig. 1 is a schematic structural diagram of a non-isothermal hot press molding apparatus for a composite micro-aspheric lens array according to an embodiment of the invention.
Fig. 2 is a schematic diagram of non-isothermal hot press molding of a compound micro-aspheric lens array.
Fig. 3 is an effect diagram of the composite micro-aspheric lens array after non-isothermal hot press molding.
FIG. 4 is a diagram of the effect of non-isothermal hot pressing directly by using a microstructure mold core.
In the figure: 1. an upper machine base; 2. a heating device; 3. mounting a template; 4. a microstructure mold core; 5. a microstructured thin web; 6. a controller; 7. a hydraulic drive device; 8. a hydraulic cylinder; 9. a lower machine base; 10. a lower template; 11. a tensioning device; 12. and (5) a workpiece. 13. And (3) compounding a micro-aspheric lens array.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples, but the scope of the invention as claimed is not limited to the scope of the examples shown.
Example 1
As shown in fig. 1, a non-isothermal hot press molding apparatus for a composite micro-aspheric lens array sequentially includes, from top to bottom: the device comprises an upper machine base 1, an upper template 3, a microstructure mold core 4, a lower template 10 for placing a workpiece 12, a lower machine base 9, a hydraulic cylinder 8 and a hydraulic driving device 7, wherein the heating device 2 is arranged in the upper machine base 1 and used for heating the upper template 3, a microstructure thin net 5 is arranged between the microstructure mold core 4 and the lower template 10, and the hydraulic driving device 7 is connected with a controller 6 through a circuit.
Two ends of the microstructure thin net 5 are tensioned through a tensioning device 11 provided with a tensioning wheel, and the tensioning device is fixed on the lower machine base 9. The tensioning device 11 can be used to adjust the tension of the microstructured web 5 to meet the requirements of thermoforming.
The microstructure thin net 5 is made of nylon fiber material, the pore size range is 200-500 meshes, the softening point is 200-220 ℃, and the wire diameter is 0.1-20 μm. The microstructure mold core 4 is made of mold steel, stainless steel or metal alloy.
Example 2
A composite micro-aspheric lens array non-isothermal hot press molding method based on the device comprises the following steps:
1) placing a workpiece 12 on a lower template 10, placing the microstructure thin net 5 above the workpiece 12 by 5mm, and tensioning the microstructure thin net 5 by a tensioning device 11 by adjusting the relative positions of a left tensioning wheel and a right tensioning wheel;
2) the heating device 2 raises the temperature of the microstructure mold core 4 to be above the softening point of the workpiece 12;
3) the controller 6 enables the hydraulic driving device 7 to drive the hydraulic cylinder 8 to act on the lower base 9, so that the workpiece 12 and the microstructure thin net 5 are in contact with the heated microstructure mold core 4, heat is transferred to the workpiece 12 from the microstructure mold core 4, the temperature of the surface material of the workpiece 12 gradually exceeds the softening point of the workpiece to become a semi-molten state, the semi-molten material is extruded into a microstructure concave cavity of the microstructure mold core 4 through meshes of the microstructure thin net 12, the V-shaped micro-groove structure concave cavity of the microstructure mold core 4 controls the material to be hot-pressed to form a micro-prismatic lens array, and the microstructure thin net 5 after elastic deformation is controlled on the surface of the micro-prismatic lens array to form a composite micro;
4) and maintaining the pressure for 0.1-5s, then driving the workpiece 12, the lower template 10, the microstructure thin net 5 and the tensioning device 11 to be separated from the microstructure mold core 4 together by the hydraulic cylinder 8, finally taking out the workpiece 12 from the bottom of the microstructure thin net 5, and naturally cooling the workpiece 12, wherein the microstructure thin net can be recycled for multiple times.
Specifically, the height of the compound micro-aspheric lens array is gradually reduced from the top to the bottom of the micro-prism lens; the molding height h of the micro prismatic lens array and the molding height h of the composite micro aspheric lens array molded on the top of the micro prismatic lens array*Determined by the following equation:
h＝10.575p-0.435T-1.097t0.009sr-1.115(1)
h*＝-28.235p0.454T5.874t0.156s2.481r-2.003f0.092(2)
wherein p represents a hot pressing pressure in MPa; t represents the temperature of the mold core; t represents the dwell time in units of s; s represents the wire diameter of the microstructure thin net, and the unit is mum; r represents the pore size of the microstructure thin web in μm; f represents the microstructure web tension in N.
Specifically, the quadratic axisymmetric surface profile shape of the micro-aspherical lens array can be obtained by the following formula:
h*＝Ar2(3)
a is the aspheric lens quadratic term coefficient.
Specifically, the characteristic size range of the microstructure mold core 4 is 1-1000 μm;
specifically, the heating temperature of the microstructure mold core 4 is set to be greater than the softening point of the workpiece 12 and less than the viscous state transition temperature of the workpiece 12; the hot pressing pressure is 0.1-18 MPa.
In this embodiment, the height of the V-shaped micro-groove structure of the microstructure mold core 4 is 100 μm, and the angle of the micro-groove is 120 °. The microstructure thin net 5 is made of nylon fiber material, the aperture is 53 μm, the softening point is 200-220 ℃, and the wire diameter is 70 μm. The workpiece 12 is PMMA and has a glass transition temperature of 108 ℃. The tension of the tension device 11 is 0.1-10N, the temperature of the microstructure mold core 4 is 120 ℃, the pressure maintaining time is 3s, and the hot pressing pressure is 12 MPa. The height range of the hot-press molding micro prism lens array is 10-80 μm, the height range of the composite micro aspheric lens array 13 is 2-50 μm, and the effect graph is shown in fig. 3.
Example 3
As a comparison, this example was carried out as follows:
1) the workpiece 12 is placed directly on the lower template 10 without the use of the microstructured web 5;
2) the heating device 2 raises the temperature of the microstructure mold core 4 to be above the softening point of the workpiece 12;
3) the controller 6 enables the hydraulic driving device 7 to drive the hydraulic cylinder 8 to act on the lower machine base 9, so that the workpiece 12 is in contact with the heated microstructure mold core 4, heat is transferred to the workpiece 12 from the microstructure mold core 4, the temperature of the surface material of the workpiece 12 gradually exceeds the softening point of the surface material and becomes a semi-molten state, the semi-molten material is extruded into a microstructure concave cavity of the microstructure mold core 4, and the V-shaped micro-groove structure concave cavity of the microstructure mold core 4 controls the material to be subjected to hot-press molding to form a micro-prism lens array;
4) maintaining the pressure for 0.1-5s, then driving the workpiece 12 and the lower template 10 to be separated from the microstructure mold core 4 by the hydraulic cylinder 8, and finally naturally cooling the workpiece 12 and taking out.
In this embodiment, the micro-groove angle is 120 °. The workpiece 12 is PMMA and has a glass transition temperature of 108 ℃. The temperature of the microstructure mold core is 120 ℃, the dwell time is 3s, the hot-pressing pressure is 12MPa, and the forming effect is shown in figure 4.
In conclusion, the invention makes full use of the microstructure core surface microstructure and the thin net surface microstructure, and can perform one-time non-isothermal hot-pressing micro-molding to obtain the composite micro-aspheric lens array. The microstructure on the surface of the microstructure mold core 4 provides a primary micro prismatic lens array structure for the composite microstructure, and the microstructure on the surface of the microstructure thin net 5 can further form a micro aspheric lens array surface in spatial distribution on the surface of the primary microstructure. The size of the composite microstructure can be conveniently controlled by controlling the aperture, the tensile force and the linear diameter of the microstructure thin net 5, the temperature of the microstructure mold core, the pressure maintaining time and the pressure maintaining pressure. The composite microstructure array is high in forming efficiency, convenient and practical and low in processing cost.
The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a non-isothermal hot briquetting device of compound little aspheric surface lens array which characterized in that includes from top to bottom in proper order: the device comprises an upper machine base (1), an upper template (3), a microstructure mold core (4), a lower template (10) for placing a workpiece (12), a lower machine base (9), a hydraulic cylinder (8) and a hydraulic driving device (7), wherein a heating device (2) for heating the upper template (3) is arranged in the upper machine base (1), a microstructure thin net (5) is arranged between the microstructure mold core (4) and the lower template (10), the microstructure thin net (5) is located 0-50mm above the workpiece (12), and the hydraulic driving device (7) is connected with a controller (6) through a circuit.
2. The non-isothermal hot press molding device of the compound micro-aspheric lens array according to claim 1, characterized in that two ends of the microstructure thin net (5) are tensioned by a tensioning device (11) with a tensioning wheel, and the tensioning device is fixed on the lower machine base (9).
3. The non-isothermal hot press molding device of a composite micro-aspheric lens array as claimed in claim 1, wherein the microstructure thin net (5) is made of nylon fiber material, the aperture mesh range is 200-500 mesh, the softening point is 200-220 ℃, and the linear diameter is 0.1-20 μm.
4. The non-isothermal hot press molding device for the compound micro-aspheric lens array according to claim 1, characterized in that: the microstructure mold core (4) is made of mold steel, stainless steel or metal alloy.
5. A non-isothermal hot press molding method for a composite micro-aspheric lens array based on the device of any one of claims 1 to 4, comprising the steps of:
1) a workpiece (12) is placed on a lower template (10), a microstructure thin net (5) is placed at a position 0-50mm above the workpiece (12), and a tensioning device (11) tensions the microstructure thin net (5) by adjusting the relative positions of a left tensioning wheel and a right tensioning wheel;
2) the heating device (2) enables the temperature of the microstructure mold core (4) to rise above the softening point of the workpiece (12);
3) the controller (6) enables the hydraulic driving device (7) to drive the hydraulic cylinder (8) to act on the lower base (9), so that the workpiece (12) and the microstructure thin net (5) are in contact with the heated microstructure mold core (4), heat is transferred to the workpiece (12) through the microstructure mold core (4), the temperature of the surface material of the workpiece (12) gradually exceeds the softening point of the workpiece to become a semi-molten state, the semi-molten material is extruded into a microstructure concave cavity of the microstructure mold core (4) through meshes of the microstructure thin net (12), the V-shaped micro-groove structure concave cavity of the microstructure mold core (4) controls the material to be hot-pressed to form a micro-prismatic lens array, and the microstructure thin net (5) after elastic deformation is controlled on the surface of the micro prismatic lens array to form a composite micro-aspheric lens;
4) keeping the pressure for 0.1-5s, directly demoulding, naturally cooling the workpiece (12) and taking out.
6. The non-isothermal hot press molding method of a compound micro-aspheric lens array according to claim 5,
the height of the compound micro-aspheric lens array is along the top of the micro-prism lensGradually decreases to the bottom; the molding height h of the micro prismatic lens array and the molding height h of the composite micro aspheric lens array molded on the top of the micro prismatic lens array*Determined by the following equation:
h＝10.575p-0.435T-1.097t0.009sr-1.115(1)
h*＝-28.235p0.454T5.874t0.156s2.481r-2.003f0.092(2)
wherein p represents a hot pressing pressure in MPa; t represents the temperature of the mold core; t represents the dwell time in units of s; s represents the wire diameter of the microstructure thin net (5) and the unit is mum; r represents the pore diameter of the microstructure thin net (5) and the unit is mum; f represents the tension of the microstructured web (5) in N.
7. The non-isothermal hot press molding method of a compound micro-aspheric lens array as claimed in claim 6,
the quadratic axisymmetric surface profile shape of the micro-aspheric lens array can be obtained by the following formula:
h*＝Ar2(3)
a is the aspheric lens quadratic term coefficient.
8. The non-isothermal hot press molding method of a compound micro-aspheric lens array according to claim 5,
the microstructure characteristic size range of the microstructure mold core (4) is 1-1000 mu m.
9. The non-isothermal hot press molding method of a compound micro-aspheric lens array according to claim 5,
the heating temperature of the micro-structure mold core (4) is set to be greater than the softening point of the workpiece (12) and less than the viscous state transition temperature of the workpiece (12); the hot pressing pressure is 0.1-18 MPa.
10. The non-isothermal hot press molding method of the compound micro-aspheric lens array according to claim 5, characterized in that: the tensioning force of the tensioning device (11) is 0.1-50N.
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|---|---|---|---|---|
| CN101851069A (en) * | 2010-02-11 | 2010-10-06 | 浙江工业大学 | Method for preparing polymer super-hydrophobic surface by using screen template method |
| JP2010243548A (en) * | 2009-04-01 | 2010-10-28 | Seiko Epson Corp | Lens array, manufacturing method thereof, and line head |
| CN201872219U (en) * | 2010-09-15 | 2011-06-22 | 无锡锦和科技有限公司 | Tensioning mechanism for pad net of hot press |
| CN106938534A (en) * | 2017-04-05 | 2017-07-11 | 华南理工大学 | The quick heat pressing forming device and method of a kind of micro- arch lens array of macro surface |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010243548A (en) * | 2009-04-01 | 2010-10-28 | Seiko Epson Corp | Lens array, manufacturing method thereof, and line head |
| CN101851069A (en) * | 2010-02-11 | 2010-10-06 | 浙江工业大学 | Method for preparing polymer super-hydrophobic surface by using screen template method |
| CN201872219U (en) * | 2010-09-15 | 2011-06-22 | 无锡锦和科技有限公司 | Tensioning mechanism for pad net of hot press |
| CN106938534A (en) * | 2017-04-05 | 2017-07-11 | 华南理工大学 | The quick heat pressing forming device and method of a kind of micro- arch lens array of macro surface |
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