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| Categories | African Certification |
|---|---|
| Brand Name: | LCS Compliance Laboratory |
| Model Number: | MTBF certification |
| MOQ: | 1pcs |
| Price: | 100USD |
| Payment Terms: | L/C, D/A, D/P, T/T |
Certification introduction
MTBF certification refers to the certification of the mean time
between failures of a product. The full English name is "Mean Time
Between Failure". In fact, MTBF refers to the MTBF test report,
which is a report on product reliability prediction. MTBF is a
reliability indicator that measures the reliability of a product
(especially electrical products). The unit is "hour". It reflects
the time quality of the product and is the ability of the product
to maintain functionality within a specified time. Specifically, it
refers to the average working time between two adjacent failures,
also known as the mean time between failures. In summary, a product
with fewer failures means high reliability. The ratio of the total
number of product failures to the total number of life units is
called the "Failure rate". It only applies to repairable products.
At the same time, it is also stipulated that the ratio of the
cumulative working time of the product to the number of failures
during the total use period is MTBF. Generally, the MTBF of disk
array products cannot be less than 50,000 hours.
MTBF data calculation
Suppose the MTBF of a computer is 30,000 hours. Is it detected by
running the computer continuously for 30,000 hours? Of course not,
otherwise there would be so many products that would take decades
to be tested. The most common and authoritative standard for
calculating MTBF value is MIL-HDBK-217 (proposed by the Reliability
Analysis Center and Rome Laboratory and became an industry
standard), which is specially used for Bellcore (proposed by
AT&T Bell Laboratory and became the standard for MTBF of
civilian products). Industry Standard).
The main consideration in MTBF calculation is the failure rate of
each component in the product. However, since the failure rates of
devices will vary greatly in different environments and usage
conditions, these factors must be considered when calculating
reliability indicators. These factors are almost impossible to
calculate manually, but with the help of software such as MTBFcal
and its huge parameter library, the MTBF value can be easily
obtained. If a factory that works three shifts a day requires
continuous operation for 24 hours and a failure-free rate P(t)=99%
or more, the MTBF of the machine tool must be greater than 4500
hours. MTBF5000 hours requires higher and more complex production
lines composed of different numbers of CNC machine tools. We only
discuss a single machine tool here:
If the failure rate ratio between the host machine and the CNC system is 10:1 (the reliability of the CNC system is an order of magnitude higher than that of the host machine), the MTBF of the CNC system will be greater than 50,000 hours, and the CNC device, spindle and driving part, etc. The MTBF of the main part must be greater than 100,000 hours.
MTBF is not detected in actual operation, it is converted through
the national standard detection algorithm. For example, Lenovo
Yangtian's MTBF of 60,000 hours was obtained by submitting 192
Lenovo Yangtian computers for inspection. During a 40-day
experimental period, the tested products were subjected to
comprehensive changes in voltage, temperature, humidity, etc. at a
specific frequency. Environmental stress, according to the
corresponding relationship between electronic product reliability
and time characteristics, the experimental results are converted
using a standard data model. Similarly, the 100,000-hour MTBF of
Tongfang Beyond E350 is calculated from 400 computers and 18 days
of testing results.
In fact, we don’t need to pay attention to how to calculate the MTBF value. As long as we know that choosing products with high MTBF value will bring us higher competitiveness. Of course, the higher the MTBF value, the better. The higher the reliability, the higher the cost of the machine tool. Just choose moderate reliability according to actual needs.
The purpose of MTBF analysis
1. Key countermeasures against high-frequency faulty parts and the
basis for technical transformation to extend the life of parts.
2. Calculate the life cycle of parts and prepare the best
maintenance plan.
3. Regarding the selection of inspection objects and items and the
setting and improvement of inspection standards.
4. Used to guide the allocation of internal and external
maintenance work. Based on the evaluation of the company's
equipment repair capabilities, the risks in terms of maintenance
quality and equipment efficiency of the internal work are
determined based on the type of equipment and types of operations,
which serves as an important reference for maintenance outsourcing.
5. Set benchmarks for spare parts. The various reserve items and
basic inventory quantities of mechanical and electrical parts
should be judged based on MTBF record analysis to achieve the most
economical inventory level.
6. Use it as a reference for selecting the key points for
improvement of maintenance technology methods. In order to improve
equipment availability, it is necessary to shorten the time for
long-term maintenance work and engineering adjustments and
switching related to equipment downtime. Therefore, it is necessary
to inspect the maintenance operation method, and the basic
information such as the items to be inspected and the selection of
priorities need to be based on the MTBF analysis record sheet.
7. Used to set estimated operating time standards for equipment
objects, as well as research on the selection of maintenance
operations and maintenance time standards. The setting of estimated
time standards for maintenance plans and the selection of
maintenance operations must consider factors such as the equipment
maintenance repetition cycle or the difference between the standard
time value and the actual maintenance time, as well as the
characteristics of the corresponding maintenance operations.
Therefore, the MTBF analysis table is very necessary.
8. Reference for organizing drawings and reselecting key equipment
or parts. MTBF's analysis record sheet records information such as
equipment parts modification projects or friction deterioration, as
well as equipment drawing modifications or pre-production, etc.
Through frequent analysis and inspection and importance ranking
management, engineering drawing management can be made easier.
9. Set and revise operating standards and determine the allocation
of responsibilities for equipment maintenance business.
10. Provide technical information on equipment reliability and
maintainability design. The most important thing about maintenance
technology is to collect technical information about the
reliability and maintainability design of equipment based on the
MTBF analysis table, so as to provide it to the design department
for reference when designing equipment.
MTBF Reference Standard
The reference standards usually corresponding to MTBF are:
Telcordia SR 232
Apply for MTBF information
Product BOM
product specifications
Product usage conditions
Do corresponding tests to obtain data on temperature rise, current
or voltage.
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