In the CNC hardware processing industry, after the product process is completed, the accuracy of the testing instruments directly determines the product quality and customer trust. To ensure the reliability of the measurement data, the instrument calibration process must be strictly implemented. The specific specifications are as follows:
1. Calibration basis and cycle
All testing instruments (such as calipers, micrometers, height gauges, projectors and three-coordinate measuring machines) must formulate calibration plans based on national standards (such as JJG, JJF series) or industry specifications. Conventional instruments are calibrated once a quarter, and high-precision equipment is calibrated once a month. Newly purchased equipment must be calibrated for the first time by a third-party certification agency before it can be put into use.
2. Environmental and personnel control
Before calibration, ensure that the laboratory environment meets the requirements (temperature 20±1℃, humidity ≤60%) to avoid vibration and electromagnetic interference. Operators must hold a metrology qualification certificate and receive regular equipment operation and data processing training. Anti-static gloves must be worn throughout the calibration process.
3. Five-step calibration method
Pretreatment: clean the instrument working surface and check the wear of mechanical parts
Standard comparison: use standard gauge blocks/standard parts for repeated measurements at multiple points
Error analysis: record deviation values and calculate uncertainty (need to be ≤ 1/3 of the allowable error)
Adjustment and repair: perform software compensation or hardware repair on out-of-tolerance equipment
Label management: green "calibration qualified" labels are affixed to qualified equipment, and red labels are used to isolate deactivated equipment
4. Data traceability management
Establish electronic calibration files, record equipment number, calibration date, error curve, operator and other information, and the data retention period shall not be less than 2 times the product warranty period, and support scanning to trace calibration records for the past three years.
A standardized calibration system can not only reduce the quality accident rate by 0.3%-0.8%, but also improve the measurement consistency to more than 99.6%. It is recommended that enterprises invest 1.5%-2% of the original value of the equipment in the construction of the measurement system each year. This is the key technical guarantee for passing ISO9001 and IATF16949 certification, and it is also the core competitiveness for winning high-end manufacturing orders.
Our company can provide OEM/ODM Wiring Harness ，Cnc Machining Parts based on your requirements. Wiring harness, also known as Cable Harness, CNC machining parts are assembly of Cnc Milling Service which transmit signals or electrical power. In the future, we will continue to uphold the business philosophy of "integrity, responsibility, and innovation", provide customers with better products and services, and work together to create a better tomorrow. Consultation hotline: 0755-29426119.
Sejow (Shenzhen) Industrial Co., Ltd.
