Quality control ensures stable product performance, consistent production results, and long-term reliability. Our QC system follows strict standards covering supplier evaluation, incoming inspection, process monitoring, and final product testing. Each stage uses quantitative indicators, automated tools, and traceable records to guarantee product quality.
Supplier Evaluation
We select suppliers through a strict screening model to ensure raw materials meet safety and performance requirements.
Supplier Evaluation Criteria
|
Item |
Evaluation Standard |
Status Requirement |
|
Material Consistency |
Dimensional accuracy, hardness, chemical stability |
Must meet internal tolerance |
|
Certification |
ISO, RoHS, CE |
Mandatory |
|
Delivery Performance |
On-time delivery rate |
≥ 95% |
|
Quality Stability |
Defect rate from past 6 batches |
≤ 1.5% |
Key Points
- Only approved suppliers enter the material list.
- Continuous scoring ensures long-term consistency.
- Problem suppliers are removed based on quarterly audits.
Incoming Material Inspection
Each batch of materials is checked using fixed standards. Qualified materials move to production; unqualified materials are rejected or re-inspected.
Incoming Inspection Items
|
Inspection Item |
Testing Method |
Acceptance Criteria |
|
Dimensions |
Caliper, micrometer |
±0.02 mm tolerance |
|
Appearance |
Visual inspection |
No cracks, dents, oil, or scratches |
|
Electrical Performance |
Multimeter test |
Must match nominal values |
|
Packaging Integrity |
Visual check |
No moisture or impact damage |
Highlights
- All results are digitally recorded.
- Traceability codes allow source tracking within seconds.
- Inspection frequency increases for new suppliers.
Production Process Control
Process control ensures every production step follows the same standards with stable parameters.
Process Monitoring Parameters
|
Parameter |
Monitoring Tool |
Control Requirement |
|
Temperature |
Infrared sensor |
±2°C range |
|
Voltage / Current |
Smart meter |
Real-time stability |
|
Assembly Torque |
Torque wrench |
100% compliance |
|
Communication Signal |
Protocol tester |
Must pass handshake test |
Process Guarantee Measures
- Each workstation equipped with automated detection modules.
- Abnormal parameters trigger immediate alarms.
- Continuous monitoring reduces hidden defects.
Final Product Testing
Every finished product goes through multi-stage function tests to ensure reliable performance before shipment.
Final Test Items
|
Test Category |
Description |
Requirements |
|
Functional Test |
Full function check under load |
100% pass rate |
|
Stability Test |
Continuous operation for 2–4 hours |
No overheating or failure |
|
Communication Test |
RS485, MODBUS, CAN, wireless protocols |
Must connect and respond correctly |
|
Safety Test |
Overload, short-circuit, insulation |
Must meet safety limits |
Additional Measures
- Defective units are not allowed to enter packaging.
- Test data remain stored on the internal QC cloud.
- Each unit receives a unique serial tracking code.
Packaging and Shipping Inspection
Before leaving the factory, products are checked again under a strict shipping checklist.
Pre-Shipment Checklist
|
Item |
Standard |
|
Label Verification |
Model, serial number, QR code |
|
Accessory Completeness |
Manuals, cables, and mounting parts |
|
Drop-Test Packaging |
Must withstand simulated transportation |
|
Moisture Control |
Anti-humidity packaging for long-distance shipping |
Purpose
- Ensures products maintain integrity during transportation.
- Reduces customer return rates and shipping damage.
Continuous Improvement System
Quality control is not static. Data is continuously analyzed to optimize production and improve efficiency.
QC Improvement Indicators
|
Indicator |
Goal |
|
Defect Rate |
Reduced by 5–8% annually |
|
Customer Complaint Rate |
< 0.5% |
|
Production Yield |
≥ 98.5% |
|
Response Time for Issues |
< 24 hours |
Improvement Actions
- Monthly QC meetings.
- Equipment calibration every quarter.
- Feedback from customers converted into executable actions.