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①Component Forward Design and Tolerance Allocation Based on Optical Imaging Principles

1. Optical Performance-Driven Precise 3D Modeling

● Based on the strict requirements of optical systems for coaxiality, runout, and mating clearance of mechanical components such as lens barrels, lens holders, and aperture blades, professional CAD software is used to construct high-precision 3D models. Ensure that the coaxiality of lens barrel bores, flatness of lens holder mounting surfaces, and mating clearance of aperture blades comply with optical design tolerance requirements, providing accurate references for subsequent ultra-precision machining.

● Collaborate closely with optical design engineers, translating aberration control requirements, stray light suppression needs, and temperature adaptability requirements of imaging systems into specific design features such as anti-reflection thread layouts, stress relief groove designs, and multi-material matching structures.

2. Ultra-Precision Assembly-Oriented Structure Optimization

● Fully consider the centering requirements and stress control needs during optical component assembly, optimizing mechanical structural morphology. By controlling stiffness distribution in thin-wall lens barrels, optimizing retaining ring thread parameters, and avoiding assembly interference, enhance assembly process feasibility and reduce assembly stress effects on optical performance.

● Perform dynamic simulation analysis on moving components such as zoom lens barrels, optimizing guide structures and drive interface designs; conduct thermal matching design for lens holders used in high-low temperature environments, selecting metallic materials with thermal expansion coefficients similar to optical materials to ensure imaging stability across the entire temperature range.

② High-Stability Metallic Materials and Pretreatment Technology

1. Precision Opto-Mechanical Material Precision Selection

● Based on performance requirements of different optical instrument components, construct a specialized material system: lens barrels and holders use Invar alloy or Super Invar alloy with extremely low thermal expansion coefficients; focusing guide shafts use non-magnetic stainless steel to avoid magnetic field interference; aperture blades use high-elasticity beryllium bronze to ensure millions of opening-closing cycles.

● Establish strict incoming material inspection standards, performing thermal expansion coefficient measurement for Invar alloys, magnetic permeability testing for non-magnetic stainless steels, and elastic modulus and fatigue performance testing for beryllium bronze, ensuring each batch meets the long-term stability requirements of optical instruments.

2. Dimensional Stability Pretreatment Technology

● Apply multiple cycle heat treatments to precision lens barrel and holder blanks, including solution treatment, cold treatment, and aging treatment, fully eliminating residual stresses to achieve microstructural states with excellent dimensional stability. Apply cryogenic treatment to machined parts to further stabilize dimensions and prevent deformation during use.

● Apply degassing treatment to parts with vacuum compatibility requirements, removing gases adsorbed inside materials through high-temperature vacuum baking, ensuring no contaminant release in vacuum environments, meeting space optics and semiconductor optics equipment requirements.

③ Opto-Mechanical Machining Process Based on Sub-Micron Precision

1. Ultra-High Precision CNC Equipment and Thermal Stability Control

● Configure ultra-high precision turning centers and jig grinders with hydrostatic guideways and air-bearing spindles, achieving 0.1μm-level positioning accuracy and 0.02μm-level repeatability. Install equipment in constant temperature workshops with independent foundations, maintaining environmental temperature at 20±0.1°C.

● Establish equipment thermal stability control systems, minimizing machining process thermal deformation through constant temperature coolant circulation and spindle cooling systems. Equip with on-machine laser calibration systems for regular automatic detection and compensation of machine geometric errors.

2. Single-Point Diamond Turning and Ultra-Precision Cutting Technology

● Apply single-point diamond turning processes for lens barrel bores and lens holder mounting surfaces, achieving mirror-grade surfaces with Ra≤0.01μm through natural single-crystal diamond tools and nanometer-level feeds, directly usable for optical element mounting without subsequent polishing.

● Apply ultra-precision cutting for precision moving components such as aperture blades and focusing mechanisms, controlling edge burr height below 0.5μm through optimized tool geometry parameters and cutting paths, ensuring motion smoothness and positional repeatability.

3. Jig Grinding and Precision Hole System Machining Technology

● Apply jig grinding processes for lens barrels of multi-lens coaxial systems, completing multiple precision hole systems in a single setup to ensure coaxiality between holes within 0.5μm. Achieve bore diameter tolerance of ±1μm and roundness of 0.3μm through CBN wheels and on-machine measurement compensation.

● Apply combined surface grinding and lapping processes for lens holder mounting surfaces, controlling flatness within 0.5μm and surface roughness Ra≤0.02μm through precision fixtures and vacuum chucks, providing ideal mounting references for optical elements.

4. Thread and Thin-Wall Component Precision Machining Technology

● Apply thread whirling and thread grinding processes for retaining rings and focusing threads, controlling pitch diameter tolerance within ±2μm and pitch cumulative error within 1μm, ensuring smooth focusing feel and precise positioning.

● Apply stress-free clamping technology for ultra-thin lens barrels, eliminating clamping deformation through low-melting-point alloy filling or vacuum adsorption methods. Apply small depth of cut and high feed rate strategies, minimizing cutting forces to ensure post-machining wall thickness uniformity and roundness.

④Nanometer-Level Inspection and Clean Assembly Quality Control

1. Ultra-High Precision Measurement Equipment Configuration

●  Configure laser interferometers and ultra-high precision coordinate measuring machines, establishing constant temperature ultra-clean metrology rooms to ensure measurement environment temperature is maintained at 20±0.1°C with Class 100 cleanliness. Conduct comprehensive inspection of lens barrel bore diameter, roundness, and coaxiality, controlling measurement uncertainty within 0.1μm.

● Apply white light interferometers and atomic force microscopes for nanometer-level roughness measurement and micro-topography analysis of optical mounting surfaces, ensuring surfaces meet optical contact requirements.

2. On-Machine Measurement and Closed-Loop Compensation Technology

● Configure high-resolution probe systems on ultra-precision machining centers, performing critical dimension measurements directly on machine tools after finishing, automatically calculating tool wear compensation values and thermal deformation corrections through macro programs, achieving sub-micron level closed-loop accuracy control.

● Establish real-time SPC monitoring systems for critical dimensions, dynamically tracking lens barrel bore diameter, lens holder flatness, and thread pitch diameter, automatically triggering process adjustments when process capability index CPK falls below 1.33, ensuring batch product consistency.

2. Clean Assembly and Contamination Control System

● Establish Class 100 clean assembly lines, performing ultrasonic precision cleaning and plasma cleaning on opto-mechanical parts to remove surface micro-contaminants. Conduct assembly processes under laminar flow hoods with real-time environmental cleanliness monitoring to prevent particulate contamination.

● Perform transmitted wavefront testing and modulation transfer function testing on assembled lens barrel assemblies to verify optical system imaging quality. Optimize lens spacing and decentering through computer-aided alignment technology to achieve optimal optical performance.

⑤ Precision Optics Talent Development and Clean Production Management System

1. Opto-Mechanical Interdisciplinary Talent Development

● Build an interdisciplinary team consisting of optical design engineers, precision mechanical engineers, and ultra-precision machining technicians, regularly organizing cross-training in optical principles, mechanical design, and ultra-precision machining technology to cultivate versatile technical talents proficient in both optics and mechanics.

● Establish ultra-precision machining operation qualification certification systems, providing specialized training in nanometer-level machining processes, environmental control, and clean operation for technicians entering constant temperature clean workshops, permitting them to work only after passing assessments.

2. Constant Temperature Cleanroom Lean Production Management

● Establish cleanroom standard operating procedures covering all processes, solidifying temperature control specifications, material transfer procedures, and contamination handling protocols into standardized documents, ensuring operational consistency across different shifts.

● Implement 6S clean site management and real-time environmental monitoring systems, continuously monitoring clean area temperature, humidity, pressure differentials, and airborne particle concentrations 24 hours a day, automatically alerting when readings exceed the set range, ensuring production environments continuously meet optical manufacturing requirements.