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Mechanical Industry Standard of the People's Republic of China
JB/T 7517-1994
Reliability Design Review of Mechanical Products
Published on October 25, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on October 1, 1995
Mechanical Industry Standard of the People's Republic of China
Reliability Design Review of Mechanical Products
1 Subject Content and Scope of Application
JB/T7517-1994
The contents of this standard include: the concept and principles of design review, the composition of the review group, the types of reviews, and the review points, review materials and review work steps in terms of reliability, maintainability, maintainability, availability, quality and safety. This standard applies to the reliability design review work of new product development, old product improvement and localization of imported products of mechanical products. Note: The reliability in the standard name is broad. 2 Design Review
A formal, independent review of an existing or proposed design, with the goal of identifying deficiencies and design defects in meeting the requirements of use, which may affect reliability, maintainability, maintainability and the degree of satisfaction with the original design requirements, and trying to remedy them and identify possible improvement measures. 3 Design Review Principles
A design review should be conducted before making decisions on any new or improved design that may affect the performance, function, safety, reliability, availability and other characteristics of the product. The scale and frequency of design reviews depend on the importance and complexity of the product or project. Design reviews must be based on meeting user requirements and implement relevant national laws and regulations and standards. Design reviews should comprehensively consider and weigh various factors such as product performance, function, reliability, service, cost, life cycle cost, delivery time, and development cycle. Design review does not replace creative design by designers, and designers must be responsible for product design plans and design results. Design review is a form of supervision and control of product design quality, and cannot replace or weaken the step-by-step review conducted by the design department to perform technical duties.
4 Review Group
The review group is a group composed of experienced experts who perform design review tasks. It is generally composed of 7 to 15 people, with a group leader and a secretary.
The group leader should be knowledgeable, familiar with the entire process of product design, manufacturing and sales services, have a deep understanding of the project being reviewed, and be fair, objective and have strong organizational skills. The secretary should be familiar with the product and management technology, have strong organizational skills, and be able to assist the group leader in doing a good job in review and taking on record work. The members of the review group are composed of representatives of various functional departments (reliability, quality assurance, maintenance, sales, outsourcing, manufacturing, measurement, standards, etc.) related to the review project in the enterprise or peer experts and users. They put forward opinions on the feasibility and related issues of product design from the perspective of fulfilling their respective quality functions or based on their rich knowledge and experience. Personnel directly involved in product design and development generally do not participate in the review group, but should attend the meeting to listen to opinions and suggestions from all sides in order to improve the design. 5 Review Types
Review activities should be conducted before making any major design and technical decisions. During the entire design process, different types of reviews can be implemented in stages to monitor the design quality in a timely manner. 5.1 Design Decision Stage
5.1.1 Preliminary Design Review
JB/T7517-1994
Review is conducted after feasibility studies and necessary preliminary tests are conducted on market demand, technological development, production capacity, economic benefits, etc., and after the technical task book and general drawing (chapter drawing) are completed. Review the rationality and feasibility of the design plan, and assess whether the product design can meet user needs and comply with relevant laws, regulations, and standards. 5.2 Technical Design Stage
5.2.1 Detailed Design Review
Review is conducted after the general drawing and main component drawings, as well as design calculations and necessary test verifications are completed. Evaluate the correctness and rationality of the design and determine whether it can be put into the prototype trial production or trial production stage. 5.2.2 Final Design Review
The review is conducted after the prototype qualification test or trial production is completed. Determine whether the design can be prototyped and transferred to mass production. 5.3 Manufacturing and Installation Stage
5.3.1 Process and Production Design Review
The review is conducted after the production process design is completed or the first batch of products are produced. Evaluate the rationality and perfection of the manufacturing process and production management.
5.3.2 Installation Design Review
For some major engineering products that need to be installed on site by the manufacturing department, an installation design review is required. It can be conducted after the completion of the on-site survey and design or the installation of the first batch of products. Evaluate the rationality and perfection of the packaging, transportation, and installation design. 5.4 Use and Maintenance Stage
5.4.1 Use Review
The use review is conducted after the first batch of products are used and maintained, or after the selected on-site use cycle is six months, one year, five years, or ten years. Evaluate whether the product meets user needs, find out the deficiencies of the original design, and provide feedback and accumulate experience for future new product designs. 6 Review Points
Review points vary according to the review object, review purpose and review type. Reliability design review should generally consider the following items.
6.1 Reliability
a. Reliability requirements, such as mean time between failures (MTBF), mean time before first failure (MTTFF), failure rate, expected life, etc.:
b. Compare the existing or expected reliability values of the product or process with the applicable requirements, including the assumptions, models and data sources used;
c. Whether the reliability and cost targets are in line with the project plan; d. The most likely cause of failure, such as the top ten causes of failure found through failure mode and effects analysis (FMEA) or fault tree analysis (FTA);
e. Measures to improve reliability, such as improvement and replacement of components, derating design, environmental control and other measures; f. Some special manufacturing processes that need to be taken to meet the reliability requirements, including environmental step stress testing, screening and analysis; 2
JB/T7517-1994
g. Reliability requirements for packaging, transportation and storage of purchased parts; h. Reliability requirements for packaging, transportation and storage of complete products; i. Comparison of the storage life of similar products with the specified requirements, including the assumptions, models and data sources used; j. Reliability improvement of similar products and competitor products or processes; k. The impact of installation and maintenance on reliability; 1. The impact of users on reliability;
m. Reliability measurement and verification test plan, such as the number of test samples, test cycles, test conditions, life cycle stage of the test, etc. 6.2 Maintenance and maintainability
a. Maintenance policy, maintenance operation line and maintenance level required by specifications and operation; b. Spare parts replacement issues, including identification, benefits and risks of interchangeability, accessibility, removability, packaging and labeling, test equipment and other requirements;
c. Use built-in, plug-in detection devices or general inspection equipment for fault detection and diagnosis; d. Use non-invasive inspection and measurement methods; e. Maintainability requirements for each maintenance line and maintenance level, including quantitative maintainability indicators, such as mean time to recovery (MTTR) and maintenance man-hours (MMH);
f. Compliance of maintainability prediction and design with specified targets, and comparison of allocated and predicted maintainability targets with actual observed maintainability;
g. Maintainability design analysis, such as trade-off analysis between reliability, maintainability, maintainability support, accessibility and diagnostic equipment;
h. Maintainability verification test;
i. Improvement status of maintainability of similar products in the early stage. 6.3 Maintainability Support
a. Clarify the requirements for maintainability support, that is, the resources required to meet the user's specifications or expectations and the corresponding maintenance policies adopted; b. A thorough maintenance support plan and analysis of the interface with other engineering tasks; c. Maintenance personnel, skills and number;
d. Special diagnostic, repair, test equipment and tools required for each maintenance level; e. Technical manuals, concise and practical maintenance and repair procedures; f. Organizational setup responsible for repair, spare parts storage, material supply, maintenance management and training; g. Various spare parts, and their original spare parts inventory on each corrective maintenance and preventive maintenance line, their availability and spare parts replenishment delay, including the assumptions, models and data sources used, shipping packaging and marking requirements, such as identification marks and storage life; h. Maintenance support and maintenance activity reporting systems and procedures, applicability of maintenance and maintenance support requirements; i. Early maintenance and maintenance support experience of similar products; j.Maintenance and maintenance support costs, the main factors affecting the user's use cost-life cycle cost and possible improvements; 6.4 Availability
a. Analysis of the most likely causes of unplanned downtime, such as analysis of the top ten failure modes found by FMEA or FTA methods;
b. Availability requirements, such as average availability, initial instantaneous availability, and service life; 3
JB/T7517—1994
c. Comparison of availability with required availability targets, including the assumptions, models, and data sources used; d. Whether availability and cost targets meet the project plan; e. Measures to improve availability, such as modular design, redundant design, parts replacement, derating design, environmental control, quick disconnect and other design measures;
f. Availability improvement status of similar products and competitors' products; g. The impact of operating environment and field service on availability; h. Special equipment and tools for operation and maintenance; i. The influence of users on usability, for example, personnel training and competence for the job, improper use of equipment, application of inappropriate tools and parts;
j. Usability determination and verification tests, for example, number of prototypes, test cycles, test conditions, life cycle stage of the test. 6.5 Quality
6.5.1 Items related to meeting user needs and satisfying users: a. Comparison of technical specifications of materials, products and processes with design requirements and user needs; b. Confirmation of design through prototype testing; c. Product performance under intended use and environmental conditions; d. Problems of abuse and misuse;
e. Compliance with regulations, national and international standards and public practices; f. Comparison with competitive designs;
g. Comparison with similar designs and analysis of problems that have occurred in the past within and outside the enterprise to prevent them from recurring. 6.5.2 Items related to product specifications and service requirements: a. Comparison of allowable tolerances with process capabilities;
b. Acceptance and rejection criteria for products;
c. Installability, ease of assembly, storage requirements, storage period and disposability; d. Benign failure and failure safety characteristics;
e. Appearance requirements and acceptance criteria;
f. Ability to diagnose and correct problems;
g. Labels, precautions, identification, traceability requirements and instructions and document control; h. Review and use of standard parts.
6.5.3 Items related to process specifications and service requirements: a.
Designed process, including process, mechanization, automation, assembly and installation of parts and components; b. Designed testability and testability, including special inspection and test requirements; c. Specifications for materials, parts and components, including approved outsourced materials and suppliers and supply conditions; packaging, handling, storage and storage period requirements, especially safety factors related to incoming goods and product delivery. d.
Items related to design verification:
Apply other methods to verify the correctness of the original scheme calculation and analysis; a.
b, test, such as model or prototype test, formulate test outline and document the test results; c. Independent verification of the correctness of initial calculations and other design contents; 4
d. Appearance control, adequacy of identification system; .JB/T 75171994
e. Continuity or age of manufacturing, evaluation and verification of product information, and verification of the source of information, data and references, including information that has been standardized or not yet standardized. 6.6 Environmental impact
6.7 Product safety
a. Measures for safety protection, such as emergency disconnection switch, interlock control, signs, signs, circuit breaker switches, ground fault circuit breakers, smoke detection sensors;
b. c. Intended use of the product, user access range and classification, including age group, sensitivity to potential hazards and physical limitations; c. Environmental conditions, such as temperature range, humidity, direct sunlight, rainfall; d. Safety design regulations and standards for various places of use; e. Safety confirmation by external certification bodies; f. Unsafe risks, such as chemical properties (corrosive, toxic, flammable), explosion, centripetal explosion, electric shock, fire, heat, radiation, mechanical properties (pinching, sharp edges); g. Abuse and misuse failures; h. Unsafe factors that may be caused during manufacturing or quality control; 1. Difficulty of safety testing and sensitivity to operator errors; j. Reduction in product safety between manufacturing and use; k. Adequacy of instructions and warnings; 1. Potential failure assessment of purchased parts, third-party testing and certification; m. Assessment of failure safety features.
Human Factors
6.9 Legal Matters
7 Review materials and documents
7.1 Materials submitted for review
Provided by the product design team.
7.1.1 Design report
The design report for review should be concise and include the following contents: a. Design requirements; b. Basis, objectives and level of design; c.
Main features of the design and expansion and improvement compared with the original product design; d. Design analysis and test results of this stage; e. Analysis and countermeasures for major problems and weak links; f. Catalog of materials submitted for review.
7.1.2 Basic materials for review
The content of the materials varies according to the review object and review type. Basic materials generally include: a. User requirements description; b. Design specifications or standards adopted; c. Various design analysis, calculation and test, inspection reports; d. Principles and lists for selecting materials and parts: e.
Reliability, maintainability and availability prediction and allocation; Failure mode effect analysis (FMEA), fault tree analysis (FTA); f.
g. Data of competitive products;
h. Failure experience of past products and similar product designs; i. Design checklist;
j. Design development schedule;
k. Product cost accounting report.
7.2 Design review checklist
The review team shall formulate a checklist of items based on the review points, the purpose of which is to: prevent any factors that may affect reliability from being missed during the review; a.
b. Emphasize key issues during the review and improve efficiency; c. Facilitate the documentation of the review work and design results. 7.3 Documents generated by the review
Design review report, jointly prepared by the review team leader and the chief designer, mainly contains the following contents:7.3.1
Main issues raised in the review and the proposers;a.
b. Main answers to the issues;
c. Improvement measures for unresolved issues;d. Department and personnel responsible for the implementation of improvement measures; completion date of improvement measures;
f. Recommendations;
g. Priority design factors;
h. Recommendations raised in previous review meetings and the implementation status of improvement measures;i. List of documents and materials;
j. Review meeting schedule.
Improvement measures report
For each improvement measure, the person in charge of its implementation shall submit a report for the designer to make a decision. 7.3.3
Design review work evaluation report, jointly prepared by the review team leader and the chief designer, mainly includes: list of review team members;
b. Number of questions raised in the review;
Number of improvement measures proposed;
d. Number of suggestions proposed;
Number of accepted suggestions;
f. Actual or estimated review activity costs, including follow-up surveys on preparation, meetings and implementation effects; g. Evaluation of design review work, including suggestions for improving review work. 6
: Design review work steps
8.1 Formulate a design review work plan
JB/T 75171994
The enterprise shall formulate a design review work plan in advance according to the design and development progress of new products, and announce it to relevant departments and personnel. 8.2 Review preparation
8.2.1 Design department preparation
The technical department shall hire a review team leader and establish a design review team. a.
b. Prepare the review implementation schedule and notify relevant personnel two weeks in advance. c. Prepare the review materials and send them to the review team members two weeks in advance. 8.2.2
Preparation of the review team
Prepare the review inspection list and send it to the design department one week in advance. a.
b. Two days before the review meeting, the review team leader and the chief designer will draft the design review agenda and review report formation procedure. 8.3Convene a review meeting
a. The review team leader shall clarify the review objectives and requirements. b. The designer shall introduce the design content.
c. Review and discuss according to the design review checklist. d. Summarize the issues and suggestions raised and conclude. e: Form a review document and have it reviewed and signed by the leader of the competent technical department. 8.4 Follow-up on the implementation of the review results
8.4.1 The design review documents shall be included in the technical archives, and the design checklist, FMEA, FTA, etc. shall be modified in a timely manner according to the issues found in the review.
8.4.2 The design department shall respond to the issues and suggestions raised in the design review report item by item. Those who adopt the suggestions shall formulate a design implementation plan for changes, and those who do not adopt the suggestions shall explain the reasons.
The quality assurance and quality management departments shall be responsible for the follow-up management of the implementation of the review suggestions and improvement projects. 8.4.3
This standard may be modified, deleted and supplemented as necessary during implementation. The principle of tailoring is: delete the requirements that are not suitable and unnecessary for specific products; a.
b. Modify some clauses or supplement the technical requirements not included in this standard; c. Coordinate the clauses that are inconsistent with other standards. Additional notes:
This standard is proposed and managed by the Reliability Technology Research Center of the Mechanical Science Research Institute of the Ministry of Machinery Industry. This standard is drafted by the Reliability Technology Research Center of the Mechanical Science Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Sun Huiqin, Xu Shulan and He Dongda. This standard refers to IEC1160: 1992 Formal design review and ISO/DIS9004-1: 1993 Quality management and quality system elements Guidelines. 7
People's Republic of China
Mechanical Industry Standard
Reliability Design Review of Mechanical Products
JB/T 75171994
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Format 880×1230
Postal Code 100044)
1/16 Printing Sheet 3/4
Word Count 14,000
First Edition April 1995bzxZ.net
First Printing April 1995
Print Quantity 1-500
Price RMB 6.00
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_ /
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