Method for quickly and correctly verifying forming parameters of an optical lens mold

Abstract

The application discloses a kind of optical lens mold fast correct verification forming parameter method, its steps include: a, injection mold does DOE experiment, to confirm optical lens finished product outer diameter shrinkage, and ensure that finished product outer diameter shrinkage is controlled below 1.007;B, confirm the forming pressure difference between the two aspheric profiles of optical lens, require the forming pressure difference between the two aspheric profiles of optical lens is less than 50KG;C, optical lens opens mold and observes, to observe whether optical lens finished product is successfully and stably adhered to the one side of mold movable mold portion when injection mold opens mold.By the above steps, the application can quickly find reasonable forming parameters for optical lens injection molding, and can avoid unreasonable condition parameters leading to injection mold modification again changing conditions into dead loop, and then can effectively shorten optical lens product development cycle.

Description

Technical Field

[0001] This invention relates to the field of optical lens injection molding technology, and in particular to a method for quickly and accurately verifying molding parameters of optical lens molds. Background Technology

[0002] Optical lenses, as the core component of lens products, are widely used in lenses of mobile phones, vehicle monitoring products, and security monitoring products. Optical lenses are manufactured by injection molding, that is, by injection molding using injection molds.

[0003] As market demands for optical lens quality continue to rise, and market competition intensifies the requirements for product development cycles, optical lens manufacturers must adapt to customers' demands for shorter lens development cycles by rapidly testing and verifying molding parameters for injection molds. This is to avoid the extended cycle caused by continuous mold modifications. Summary of the Invention

[0004] The purpose of this invention is to provide a method for quickly and accurately verifying molding parameters of optical lens molds. This method can quickly find reasonable molding parameters for optical lens injection molding and avoid the dead loop caused by unreasonable condition parameters leading to changes in conditions after the injection mold is modified. This can effectively shorten the product development cycle of optical lenses.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0006] A method for rapidly and accurately verifying molding parameters of an optical lens mold includes the following steps:

[0007] Step a: Perform a DOE test on the injection mold to confirm the outer diameter shrinkage rate of the finished optical lens and ensure that the outer diameter shrinkage rate of the finished product is controlled below 1.007.

[0008] Step b: Confirm the molding pressure difference between the two aspherical contours of the optical lens. The smaller the molding pressure difference between the two aspherical contours, the more stable the molding conditions. It is required that the molding pressure difference between the two aspherical contours of the optical lens is less than 50KG. When the molding pressure difference between the two aspherical contours of the optical lens is greater than 50KG, the gate depth is adjusted to compensate for the difference.

[0009] Step c: Observe the optical lens after mold opening to see if the finished optical lens adheres smoothly and stably to one side of the moving mold part when the injection mold is opened.

[0010] In step a, the steps for performing a DOE experiment on the injection mold include:

[0011] Step a1: Confirm the physical properties of the optical lens material. The physical properties of the optical lens material include the injection molding material temperature, the injection mold temperature parameters, and the shrinkage range of the optical lens material.

[0012] Step a2: Set the upper temperature limit for the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Then, perform injection molding adjustment with different injection pressures. The injection pressure range is 500KG-1000KG. After injection molding adjustment, monitor the outer diameter value of each finished optical lens under the upper temperature limit.

[0013] Step a3: Set the lower limit of the temperature of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Then, perform injection molding adjustment with different injection pressures. The injection pressure range is 500KG-1000KG. After injection molding adjustment, monitor the outer diameter value of each finished optical lens under the lower limit of the temperature.

[0014] Step a4: Calculate the outer diameter shrinkage rate of the finished optical lens under each condition in steps a2 and a3. Outer diameter shrinkage rate = mold outer diameter design value / finished product outer diameter value. Based on the requirement that the outer diameter shrinkage rate of the finished product needs to be controlled below 1.007, we can confirm reasonable injection mold temperature parameters and injection pressure parameters.

[0015] In step b, the step of confirming the forming pressure difference between the two aspherical profiles of the optical lens includes:

[0016] Step b1: Set the upper temperature limit of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Using the first aspherical contour surface as a reference, try to make optical lenses with different injection pressures, and then determine the minimum pressure value of the aspherical contour of the first aspherical contour surface. The minimum pressure value of the aspherical contour is the pressure point at which the surface shape does not shrink.

[0017] Step b2: Set the upper temperature limit of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Using the second aspherical contour surface as a reference, try to make optical lenses with different injection pressures, and then determine the minimum pressure value of the aspherical contour of the second aspherical contour surface.

[0018] Step b3: Based on the recorded results of steps b2 and b3, calculate the forming pressure difference between the two aspherical contours of the optical lens. The forming pressure difference = minimum pressure value of the aspherical contour of the first aspherical contour - minimum pressure value of the aspherical contour of the second aspherical contour.

[0019] In step c, a spotlight is used to illuminate the finished optical lens on one side of the moving mold part of the mold and observe whether the finished optical lens has a whitening phenomenon. The whitening phenomenon refers to the phenomenon caused by the aspherical contour of the fixed mold part of the optical lens not being smoothly and stably pulled to the side of the moving mold part of the mold, resulting in the springback of the aspherical contour of the moving mold part of the mold.

[0020] The beneficial effects of the present invention are as follows: The method of the present invention for quickly and correctly verifying molding parameters of optical lens molds can quickly find reasonable molding parameters for optical lens injection molding, and can avoid the dead loop caused by unreasonable condition parameters leading to the modification of injection molds and subsequent changes in conditions, thereby effectively shortening the product development cycle of optical lenses. Detailed Implementation

[0021] The present invention will now be described in conjunction with specific embodiments.

[0022] A method for rapidly and accurately verifying molding parameters of an optical lens mold includes the following steps:

[0023] Step a: Perform a DOE test on the injection mold to confirm the outer diameter shrinkage rate of the finished optical lens and ensure that the outer diameter shrinkage rate of the finished product is controlled below 1.007.

[0024] Step b: Confirm the molding pressure difference between the two aspherical contours of the optical lens. The smaller the molding pressure difference between the two aspherical contours, the more stable the molding conditions. It is required that the molding pressure difference between the two aspherical contours of the optical lens is less than 50KG. When the molding pressure difference between the two aspherical contours of the optical lens is greater than 50KG, the gate depth is adjusted to compensate for the difference.

[0025] Step c: Observe the optical lens after mold opening to see if the finished optical lens adheres smoothly and stably to one side of the moving mold part when the injection mold is opened; specifically, use a spotlight to align the finished optical lens with one side of the moving mold part and observe whether the finished optical lens has a whitening phenomenon. The whitening phenomenon refers to the phenomenon caused by the aspherical contour of the fixed mold part of the optical lens not being smoothly and stably pulled to the side of the moving mold part, resulting in the aspherical contour of the moving mold part springing back.

[0026] It should be noted that, in step a, the steps for performing a DOE test on the injection mold include:

[0027] Step a1: Confirm the physical properties of the optical lens material. The physical properties of the optical lens material include the injection molding material temperature, the injection mold temperature parameters, and the shrinkage range of the optical lens material.

[0028] Step a2: Set the upper temperature limit for the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Then, perform injection molding adjustment with different injection pressures. The injection pressure range is 500KG-1000KG. After injection molding adjustment, monitor the outer diameter value of each finished optical lens under the upper temperature limit.

[0029] Step a3: Set the lower limit of the temperature of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Then, perform injection molding adjustment with different injection pressures. The injection pressure range is 500KG-1000KG. After injection molding adjustment, monitor the outer diameter value of each finished optical lens under the lower limit of the temperature.

[0030] Step a4: Calculate the outer diameter shrinkage rate of the finished optical lens under each condition in steps a2 and a3. Outer diameter shrinkage rate = mold outer diameter design value / finished product outer diameter value. Based on the requirement that the outer diameter shrinkage rate of the finished product needs to be controlled below 1.007, we can confirm reasonable injection mold temperature parameters and injection pressure parameters.

[0031] Additionally, step b, which involves confirming the forming pressure difference between the two aspherical profiles of the optical lens, includes:

[0032] Step b1: Set the upper temperature limit of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Using the first aspherical contour surface as a reference, try to make optical lenses with different injection pressures, and then determine the minimum pressure value of the aspherical contour of the first aspherical contour surface. The minimum pressure value of the aspherical contour is the pressure point at which the surface shape does not shrink.

[0033] Step b2: Set the upper temperature limit of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Using the second aspherical contour surface as a reference, try to make optical lenses with different injection pressures, and then determine the minimum pressure value of the aspherical contour of the second aspherical contour surface.

[0034] Step b3: Based on the recorded results of steps b2 and b3, calculate the forming pressure difference between the two aspherical contours of the optical lens. The forming pressure difference = minimum pressure value of the aspherical contour of the first aspherical contour - minimum pressure value of the aspherical contour of the second aspherical contour.

[0035] The method for quickly and accurately verifying molding parameters for optical lens molds described above has the following advantages: Specifically, it avoids the vicious cycle of changing conditions again after mold correction due to unreasonable parameter settings, thus preventing increased mold manufacturing costs and timeliness, thereby shortening the lens project development cycle to meet customer requirements and enhance mold competitiveness. Furthermore, it confirms the rationality of molding conditions and avoids discrepancies between different machines using the same mold, preventing customers from achieving mass production. Therefore, the method for quickly and accurately verifying molding parameters for optical lens molds of this invention can quickly find reasonable molding parameters for optical lens injection molding and avoid the vicious cycle of changing conditions again after mold correction due to unreasonable parameter settings, thereby effectively shortening the optical lens product development cycle.

[0036] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for rapidly and accurately verifying molding parameters of an optical lens mold, comprising the following steps: Step a: Perform a DOE test on the injection mold to confirm the outer diameter shrinkage rate of the finished optical lens and ensure that the outer diameter shrinkage rate of the finished product is controlled below 1.

007. The steps for performing a DOE (Design of Effect) test on an injection mold include: Step a1: Confirm the physical properties of the optical lens material. The physical properties of the optical lens material include the injection molding material temperature, the injection mold temperature parameters, and the shrinkage range of the optical lens material. Step a2: Set the upper temperature limit for the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Then, perform injection molding adjustment with different injection pressures. The injection pressure range is 500KG-1000KG. After injection molding adjustment, monitor the outer diameter value of each finished optical lens under the upper temperature limit. Step a3: Set the lower limit of the temperature of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Then, perform injection molding adjustment with different injection pressures. The injection pressure range is 500KG-1000KG. After injection molding adjustment, monitor the outer diameter value of each finished optical lens under the lower limit of the temperature. Step a4: Calculate the outer diameter shrinkage rate of the finished optical lens under each condition in steps a2 and a3. Outer diameter shrinkage rate = mold outer diameter design value / finished product outer diameter value. Based on the requirement that the outer diameter shrinkage rate of the finished product needs to be controlled below 1.007, we can confirm reasonable injection mold temperature parameters and injection pressure parameters. Step b: Confirm the molding pressure difference between the two aspherical contours of the optical lens. The smaller the molding pressure difference between the two aspherical contours, the more stable the molding conditions. It is required that the molding pressure difference between the two aspherical contours of the optical lens is less than 50KG. When the molding pressure difference between the two aspherical contours of the optical lens is greater than 50KG, the gate depth is adjusted to compensate for the difference. The steps for confirming the forming pressure difference between the two aspherical profiles of an optical lens include: Step b1: Set the upper temperature limit of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Using the first aspherical contour surface as a reference, try to make optical lenses with different injection pressures, and then determine the minimum pressure value of the aspherical contour of the first aspherical contour surface. The minimum pressure value of the aspherical contour is the pressure point at which the surface shape does not shrink. Step b2: Set the upper temperature limit of the moving mold part and the fixed mold part of the mold according to the temperature parameters of the injection mold of the optical lens material. Using the second aspherical contour surface as a reference, try to make optical lenses with different injection pressures, and then determine the minimum pressure value of the aspherical contour of the second aspherical contour surface. Step b3: Based on the recorded results of steps b2 and b3, calculate the forming pressure difference between the two aspherical contours of the optical lens. Forming pressure difference = minimum pressure value of the aspherical contour of the first aspherical contour - minimum pressure value of the aspherical contour of the second aspherical contour. Step c: Observe the optical lens after mold opening to see if the finished optical lens adheres smoothly and stably to one side of the moving mold part when the injection mold is opened.

2. The method for rapidly and accurately verifying molding parameters of an optical lens mold according to claim 1, characterized in that, In step c, a spotlight is used to illuminate the finished optical lens on one side of the moving mold part of the mold and observe whether the finished optical lens has a whitening phenomenon. The whitening phenomenon refers to the phenomenon caused by the aspherical contour of the fixed mold part of the optical lens not being smoothly and stably pulled to the side of the moving mold part of the mold, resulting in the springback of the aspherical contour of the moving mold part of the mold.