An optical lens manufacturer guides you through the secrets of optical lens manufacturing processes.

Release Date:

2020-07-09 13:27

Source:

The primary purpose of the rough‑grinding process is to eliminate surface pits left on the lens from the preceding operation; it serves as an intermediate step in the grinding sequence, analogous to semi‑finishing in mechanical machining. This stage must meet specified requirements for surface roughness, surface figure error, and center thickness control, among others. Key considerations include selecting an appropriate balance between diamond grit size and the wear rate of the glass material, as well as optimizing spindle speed, swing‑arm motion, and stroke amplitude. Grinding and polishing are employed in subsequent processes to remove residual defects from rough grinding and to achieve the required surface quality, ensuring that the lens’s geometric accuracy and center thickness conform to specification.

Spherical optical lenses manufactured by lens producers can be classified as: biconvex lenses, biconcave lenses, plano-convex lenses, plano-concave lenses, and meniscus convex lenses.

Optical lens cold-processing procedure:


1.   Cutting

In order to cut the two curved surfaces of the lens to match the target spherical surface. R When the dimensions are relatively close and the surface is free of defects such as pits, the blank must be machined on a cutting machine. This step serves to thoroughly prepare for subsequent rough grinding and polishing; particular attention should be paid to the proper match between the glass’s hardness and the grit size of the cutting wheel.


2.   Rough grinding

The primary purpose of the rough‑grinding operation is to eliminate surface pits left on the lens by the preceding process; it constitutes an intermediate step in the grinding sequence, analogous to semi‑finishing in machining. This operation must meet specified requirements for surface roughness, surface figure error, and center thickness control, among others. Key considerations include selecting an appropriate match between diamond grit size and the wear rate of the glass material, as well as optimizing spindle speed and the motion characteristics and amplitude of the oscillating arm.

 

3.   Polishing

Grinding and polishing are the primary processes used in earlier manufacturing steps to eliminate defects left by coarse grinding, achieving the required surface geometric accuracy and center thickness that meet specification requirements. During these processes, attention should be paid to factors such as abrasive cleanliness, the formulation ratio of the grinding slurry, slurry temperature, the selection of the polishing pad, rotational speed, and the amplitude of the oscillating arm.


4.   Core extraction

Core‑removal machines can be classified into two types: fully automatic vertical core removal and fully automatic horizontal core removal. The primary purpose of using a diamond grinding wheel to grind the outer circumference is to align the line connecting the centers of the two spherical surfaces of a spherical lens. ( Optical axis ) With the axis of the mechanical fixture ( Geometric axis ) Coaxial alignment, while ensuring the lens surface remains scratch-free, with specified outer diameter, chamfer dimensions, and depth. ( If it is a concave lens ) All requirements are in compliance with the relevant standards; as with cutting, this process also requires consideration of the compatibility between the diamond grinding wheel grit size and the degree of glass wear.


Keywords:

Optical lens manufacturer, lenses, optical lenses

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