How to Judge Whether CNC Machining Parts Quality Standard

Описание: Hello everyone, I'm Lyra. In our previous video, we explored how to select machining processes for precision requirements. Today, we'll continue by examining how to evaluate whether CNC machined part quality meets standards.

Quality assessment for CNC special-shaped parts should focus on four key dimensions: dimensional accuracy, surface quality, assembly fit, and functional performance. Given the challenges of irregular shapes, undefined benchmarks, and complex measurements, evaluation requires multi-tool verification and scenario-based testing.

Precision Detection
Precision inspection forms the foundation of part quality. Both dimensional and geometric tolerances directly impact part functionality.

Tool selection depends on accuracy requirements:

±0.01 range: digital calipers, micrometers, depth gauges

±0.001 range: height gauges, lever dial indicators, digital micrometers

Complex multi-dimensional parts: CMM for automated data collection and drawing comparison

For more detailed information about CNC machining accuracy, please refer to our previous video.

Surface Quality
Surface quality affects sealing performance, wear resistance, and appearance. Key indicators include surface roughness, defects, and integrity.

Surface roughness (Ra) guidelines:

Ra 3.2-6.3: visibly rough with clear tool marks

Ra 0.8-1.6: smooth texture with minimal visible marks

Ra 0.2-0.4: very smooth with semi-mirror finish

While visual inspection provides quick quality assessment, measuring instruments remain essential for detecting minor defects. Additionally, CNC machining can cause work hardening and microcracks, requiring microhardness testing to verify surface hardness hasn't been excessively compromised.

Assembly Adaptation
Since most CNC parts are customized components, individual inspection approval doesn't guarantee proper assembly function. Physical assembly testing remains crucial for validation.

Assembly verification methods include:

Using CMM to measure positional deviations of key features

Applying feeler gauges to check critical clearances

Consulting assembly tolerance tables to ensure proper fit

We've prepared a simplified assembly tolerance reference table - feel free to comment or contact us if you need it.

Functional Performance
Custom CNC parts require functional testing simulating actual usage scenarios to verify they meet end-use requirements:

Load-bearing components and brackets: pressure testing for deformation/cracking

Shaft products: torque testing

Application-specific testing: sealing tests, motion performance tests

Additional Considerations
Beyond these four core areas, additional testing may include:

Physical properties: wear, corrosion, and temperature resistance

Material composition verification

Customer-specific requirements

At Longwang, quality control integrates throughout every manufacturing stage - from preparation through machining to final inspection. Our strict quality management ensures each custom part not only meets specifications but exceeds expectations. This commitment to quality helps us earn customer trust and maintain our competitive advantage.

Thanks for watching! I'm Lyra from Longwang. Please like, subscribe, and we'll see you in the next video.

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