Kunshan Ruizhengyuan Electronics Introduction: What are the processing acceptance standards for precision metal stamping parts?

The core of the acceptance criteria for precision metal stamping parts focuses on dimensional accuracy, appearance quality, performance requirements and packaging protection to ensure that it meets the requirements of the use scene.

1. Size and form and position tolerance standard

The key dimensions shall meet the requirements of the drawings. The tolerance of conventional precision parts shall be controlled within ±0.01~±0.05mm, and that of ultra-precision parts shall be within 0.005 mm..

The form and position tolerance should meet the GB/T 1184 standard, including flatness, verticality and parallelism, so as to avoid affecting the assembly accuracy.

Sampling shall be conducted by using three-coordinate measuring instrument, two-dimensional imaging instrument and other equipment, and the sampling proportion shall be set according to the batch size (sampling rate ≥3% when the batch is more than 1000 pieces).

2. Appearance quality standards

The surface shall be free of cracks, burrs, scratches, deformation and other defects, and the burr height shall be ≤0.02mm (the key mating surface shall be ≤0.01mm).

There shall be no oxidation, rust and oil residue, and the plated parts shall meet the requirements of GB/T 12335, and there shall be no peeling, peeling and color difference.

Visual inspection (distance 30~50cm) combined with magnifying glass (10~20 times) shall be adopted for detection, and unqualified products shall be 100% eliminated.

3. Performance and assembly requirements

The material properties should meet the standards, such as tensile strength and hardness meeting the raw material standards (for example, the hardness of copper alloy parts HB 80~120).

The assembly adaptability is good, the insertion force and pull-out force meet the product specifications, and there is no jamming or looseness.

Environmental resistance (such as rust prevention and temperature resistance) needs to pass special tests such as salt spray test, high and low temperature test (salt spray test usually has no rust for 48 hours or more).

4. Packaging and labeling standards

Anti-static and scratch-proof packaging is adopted to avoid damage during transportation, and each piece is separated independently or wrapped with buffer material.

The product model, specification, batch number, production date and inspection mark shall be marked on the package to ensure traceability.