GB/T 34375-2017 in English

1. Standard Overview

GB/T 34375—2017 standard specifies the reliability assessment method of CNC marine plate rolling machine in detail, including fault classification, judgment principle, sampling plan, test method and result evaluation. This standard is applicable to the verification and measurement of CNC marine plate rolling machine.

2. Fault Classification and Judgment

3. Sampling and test plan

Sampling method

• 3 units are selected for test site test
• 5-20 units or 10% are selected for on-site tracking according to the production ratio
• All units will be sampled if no more than 5 units are available

Test plan

4. Fault monitoring and data collection

Check the equipment status every 8 hours, including temperature, leakage and safety functions, and record the details. When a fault occurs, shut down the machine immediately for processing.

5. Reliability Evaluation Indicators

• MTBF (Mean Time Between Failures) Calculation Formula: MTBF = T / ∑(r_di)
• MTTR (Mean Time to Repair) Calculation Formula: MTTR = Σ(t_ri) / Σ(r_i)
• Inherent Availability A Calculation Formula: A = MTBF / (MTBF + MTTR)

6. Implementation Suggestions

1. Strictly classify and record faults in accordance with the standards to ensure data accuracy.
2. Adopt a non-replacement timed truncation test plan and set the accumulation time reasonably.
3. Regularly check the equipment status and handle abnormal situations in a timely manner to avoid affecting the assessment results.