Zhejiang Manufacturing Standards

Hot rolled cylindrical spiral compression spring

（Draft）

Standard preparation instructions

Zhejiang Jinchang Spring Co., Ltd

August 2020

Hot rolled cylindrical spiral compression spring (draft)

Standard preparation instructions

1 Project Background

1.1 Development and technological advantages of the spring industry

Although the spring industry is a small industry in the entire manufacturing industry, its role cannot be underestimated. The country's industrial manufacturing and automotive industries need to accelerate their development, and the spring industry, as one of the basic components and parts, needs a more advanced stage of development to adapt to the rapid development of the country's entire industry. At present, the production of China's spring industry is approaching saturation. According to expert statistics, the production of springs in China has reached 4 billion pieces, with a total of 21 major categories and more than 1600 varieties of spring products, mainly including valve springs, suspension springs, diaphragm springs, shock absorption springs, hydraulic springs, oil pump springs, butterfly springs, high-temperature springs, snap springs, tension springs, torsion springs, compression springs, vortex springs, and heterosexual springs. At present, most of China's spring products are general springs with low technological content, while high-tech products such as heterosexual parts and cross-sectional products can only be produced in a few large-scale ones.

In recent years, China's spring industry has achieved rapid development, with significant improvements in both technical and quality levels. As a universal component, spring functions cover many aspects such as shock absorption, energy storage, control, and tension maintenance. Its application fields involve various fields of the national economy, including aerospace, power and nuclear power equipment, high-speed railways, automobiles, medical equipment, daily hardware, toys, etc. In recent years, the rapid development of the national economy has driven the rapid growth of China's spring industry. The demand for upgrading mechanical equipment and improving the performance of supporting hosts have greatly promoted the improvement of the technical and quality level of the spring industry.

Our company's hot rolled cylindrical spiral compression springs are strictly produced in accordance with material inspection, cutting, end grinding, steel stamp identification, heating, spring rolling, quenching, tempering, shot peening, flaw detection, strong pressure, end face grinding, inspection, surface treatment, packaging and other processes.

In order to better guide production and ensure product quality. Our company's technical department has carefully prepared process documents, forming a relatively complete process document system. Strictly follow the requirements of the process documents during the manufacturing process of the spring, ensuring that the entire manufacturing process is in a controlled state. In addition, the technical department also organized process validation on the hot coil production line, including end heating, bar material heating, tip rolling machine, spring rolling machine, quenching groove, tempering furnace, flaw detection machine, shot peening machine, force measuring machine, fatigue testing machine, etc. The process validation results met the technical and production requirements. Using natural gas as energy source for rod heating is more energy-efficient and effective than traditional electric heating. And carry out capability certification for personnel, machines, materials, methods, and environments in key processes according to the program. Key spare parts and key processes must undergo self inspection, mutual inspection, and specialized inspection. Special processes shall be controlled according to the requirements of JC/CXW-23 Production Process Control Procedure. Special processes monitor the process, and necessary items are recorded in the process.                                                                      

The main quality characteristics of springs are reflected in accuracy, strength, durability, and safety. The hot rolled cylindrical spiral compression springs produced by our company meet the level 1 standard specified in the national standard in terms of accuracy indicators such as free height limit deviation, spring inner and outer diameter limit deviation, height limit deviation under specified load, and load limit deviation under specified height; After heat treatment, the hardness difference of the same batch is less than 3 HRC units, and the shot peening strength reaches the level of (0.35-0.55) A, with a shot peening coverage rate of ≥ 90%. The metallographic structure is tempered martensite, and the original austenite grain size grade is not less than 5. These strength indicators make the hot rolled cylindrical spiral compression spring produced by our company reach the international advanced level; In terms of permanent deformation, the spring should not exceed 0.4% of the free height. In addition, the springs produced by our company have undergone fatigue tests with no less than 1000 cycles, and no fracture occurred during the test. The loss rate of working load F2 is ≤ 0.5%, which effectively guarantees the durability of the hot rolled cylindrical spiral compression springs produced by our company; In terms of spring safety, the limits of cadmium, lead, zinc, and hexavalent chromium all comply with the provisions of GB/T30512.

1.3 Necessity of Research Standards

At present, there is no national or industry standard released for hot rolled cylindrical spiral compression springs in China.

The quality of various types of hot coil springs sold in the market varies, and there is instability in actual use. Therefore, it is necessary and urgent to establish industry benchmark standards and promote the healthy development of advantageous industries in Zhejiang Province by formulating the "Made in Zhejiang" standard for hot rolled cylindrical spiral compression springs.

Zhejiang Jinchang Spring Co., Ltd. has rich experience in drafting and formulating standards, and has participated in the drafting and formulation of up to 9 national standards. It is fully capable of undertaking the drafting task of the group standard "Made in Zhejiang" for "Hot Rolled Cylindrical Spiral Compression Springs".

1.4 Overview of the main drafting units of the project

Zhejiang Jinchang Spring Co., Ltd. is located in the Chengxi Industrial Zone of Zhuji City, the hometown of Xishi and a national tourist city (company address: No. 8 Wangyun West Road, Chengxi Industrial Zone). Here, the mountains and waters are beautiful and prosperous, with transportation extending in all directions. The Zhejiang Jiangxi Railway and Hangzhou Jinhua and Wenzhou Public Roads cross the area, only 60 kilometers away from Hangzhou Xiaoshan International Airport, making it very convenient for business and tourism to come to Zhuji. Our company currently has a factory area of 26000 square meters, fixed assets of 98 million yuan, and 350 employees. Among them, there are 50 engineering and technical teams, with a sales revenue of 120 million yuan in 2010. The company has passed ISO/TS16949-2002, ISO 9001-2000, ISO 14000 and other system certifications, and has obtained standardized behavior in Zhejiang Province. The measurement and testing system is qualified. The laboratory of Jinchang Company has become the motor vehicle spring testing center in Zhuji City. At present, the springs produced by our company have been sold in more than 30 countries and regions both domestically and internationally, forming a product series mainly focused on automobiles, covering sedans, microcars, cargo trucks, engineering machinery, mining machinery, petrochemicals, electrical equipment, precision instruments, sports equipment, electrical equipment, and five metal electric tools. Advanced production facilities, sophisticated testing equipment, a professional team of inspectors, strong technical strength, and scientific management methods ensure product quality, winning the praise and trust of a large number of users. Production varieties: There are various types of compression coil springs, tension springs, torsion springs, snap springs, drum springs, pagoda shaped springs, disc springs, steel plate springs, flat worm coil springs, window rocking machine springs, diaphragm springs, waveform springs, mold springs, square flat steel springs, steel plate pagoda springs, suspension shock absorbers for various types of cars, micro cars, front and rear shock absorbers for motorcycles, brake springs for heavy-duty vehicles, etc. The specifications range from steel diameter 0.2-80mm, including square steel, flat steel, various stainless steel and tin bronze springs, etc. Production equipment: There are computerized automatic spring coiling machines, various sizes of automatic spring coiling machines, advanced mesh belt transmission automatic quenching and tempering furnaces, rolling track spring strengthening shot blasting machines, surface electrostatic spraying and electrophoresis equipment, and other main equipment. Testing equipment: There are various specifications of spring tension and compression testing machines, spring fatigue testing machines, physical and chemical metallographic analysis, different specifications of flaw detection equipment, material torsion and tensile testing machines, etc. Our company has a production history of more than 30 years since its establishment. Due to our long-term focus on product quality and high-quality services, we have continuously developed and grown, and have established long-term cooperative relationships with many large and medium-sized enterprises in China. We sincerely hope that new and old friends from both domestic and foreign countries can visit our company for guidance,

2 Project sources

Zhejiang Jinchang Spring Co., Ltd. submitted a project application to the Zhejiang Provincial Brand Construction Federation, which was approved by the Provincial Brand Construction Federation and issued the Zhejiang Pin Lian [2020] No. 22 Notice on Issuing the Third Batch of "Made in Zhejiang" Standard Development Plan for 2020. The project name is "Hot rolled cylindrical spiral compression springs". The plan is to be completed before December 31, 2020.

Overview of standard development work

3.1 Units and personnel involved in standard formulation

3.1.1 The leading organization and drafting unit of this standard is Zhejiang Institute of Standardization.

3.1.2 The main drafting unit of this standard is Zhejiang Jinchang Spring Co., Ltd.

3.1.3 The drafting unit of this standard is Zhejiang Mingfeng Spring Co., Ltd.

3.1.4 The main drafter of this standard is Fei Qingmin.

3.2 Main Work Process

3.2.1 Preliminary preparation work

According to the requirements of the standard working group for "Hot Rolled Cylindrical Spiral Compression Springs", Zhejiang Standardization Research Institute is the leading unit, and Zhejiang Jinchang Spring Co., Ltd. is the main editing unit. The participants include Fei Qingmin, Zhao Jianming, Liu Xiaoming, Fang Zhou, Xu Liguang, Zhu Yanjun, Ji Guang, Yu Guowei, Liang Chuantao, and Pan Dongbao.

The standard working group has decided to have relevant personnel from Zhejiang Jinchang Spring Co., Ltd. complete the main standard preparation work. Xu Liguang is responsible for organizing and preparing the preface, scope, quality commitment, and other aspects of the standard; Zhu Yanjun is responsible for drafting performance parameters, normative reference documents, technical requirements, basic requirements, test methods, inspection rules, labeling, packaging, transportation, and storage, as well as standardizing standard content; Ark is responsible for reviewing the standard content; The overall quality of the standard architecture is controlled by the Zhejiang Provincial Institute of Standardization.

3.2.2 Standard kickoff meeting (to be held)

In accordance with the requirements for the development of "Made in Zhejiang" standards, the leading unit, Zhejiang Standardization Research Institute, organized the Zhejiang Manufacturing Group Standard Launch Conference and Seminar on "Hot Rolled Cylindrical Spiral Compression Springs" at Zhejiang Jinchang Spring Co., Ltd. on September 4, 2020. Experts from Zhejiang (Yiwu) National Standard Technology Evaluation Center, China Machinery Productivity Promotion Center National Spring Standards Committee and other units were invited to discuss the draft standards for project application, and the meeting minutes were formed after the discussion.

3.2.3 Development of standard draft

The standard development team carried out the following three aspects of standard development work in accordance with the requirements of the minutes of the standard kickoff meeting.

a. Discussion on progressiveness of specified technical indicators

Through the collection of multiple data from the standard development team, combined with the actual advanced technical indicators of our company's hot coil cylindrical spiral compression spring products, after careful comparison, analysis and discussion, it has been determined to create a "Zhejiang made hot coil cylindrical spiral compression spring" product with high precision, high strength, high durability, and high safety by improving the four indicators of product size accuracy, material strength, parallel service life, and hazardous material limitation.

b. Discussion on progressiveness of basic requirements (product design, raw materials, key technologies, processes, equipment, etc. beyond the technical indicators specified in the type test) and quality assurance

According to the framework requirements of the "Made in Zhejiang" standard, this standard specifies the basic requirements, performance requirements, test methods, inspection rules, labeling, packaging, transportation and storage, and quality commitments for hot rolled cylindrical spiral compression springs.

c. Development of draft standards in accordance with the framework requirements of the "Made in Zhejiang" standard, as well as the concept and positioning requirements of the "Made in Zhejiang" standard development

The formulation of the "Hot Rolled Cylindrical Spiral Compression Spring" standard by Zhejiang Manufacturing focuses on high precision, high strength, high durability, and high safety. The incoming materials strictly control the harmful substance hexavalent chromium in accordance with the provisions of GB/T 30512. This product is used in high temperature and high pressure conditions to ensure safe production. Our company has extensive experience in the manufacturing of hot coil springs and the promotion of optimized design products. In line with the industrial orientation of green manufacturing. Through standard guidance, promote the innovation and upgrading of production enterprises with hot coil cylindrical spiral compression springs, enhance their independent innovation capabilities, and enhance the overall quality level and international competitiveness of China's product industry.

The technical level of this standard has reached international advanced and domestic first-class level.

3.2.4 Soliciting opinions

To be written.

3.2.5 Expert review

To be written.

3.2.6 Standard Approval

To be written.

4. Principles, Main Content, and Basis for Formulation of Standards

4.1 Principles of Compilation

(1) Following the positioning of "Made in Zhejiang" standards, its main technical indicators have reached the domestic first-class and international advanced level.

(2) The standard preparation follows the principle of "compliance, necessity, progressiveness, economy and operability"; Emphasize the operability of standards.

(3) Try to align with international standards as much as possible.

(4) Write and express in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Writing of Standards".

4.2 Main content and determination basis

Chapter 4.2.1 "Scope"

This standard specifies the basic requirements, technical requirements, test methods, inspection and acceptance, as well as marking, labeling, packaging, storage and transportation, and quality commitment for hot rolled cylindrical spiral compression springs.

This standard applies to the production, inspection, and user acceptance of hot rolled cylindrical spiral compression springs.

Chapter 4.2.2 "Normative References"

Normative reference documents are referenced without dates, unless specific terms and data are specified during the reference, and all the latest (revised) standards published before 2020 have been verified and updated.

Chapter 4.2.3 "Basic Requirements"

Following the policy of "excellent quality, independent innovation" to create Zhejiang manufacturing standards and their products, the basic requirements and technical requirements in the standards mainly come from the above standards and the production practices of enterprises. In production practice, enterprises continuously optimize product performance, explore new processing techniques, research experimental testing methods, and optimize product design. At the same time, we have increased cooperation with research institutes, tracked the latest international and domestic scientific research trends, and determined the optimal parameters and most advanced and efficient testing methods and equipment in product design and production. Compared to existing advanced peer product standards:

1) Requirements have been put forward for the mechanical properties of materials, material heat treatment, product testing, verification ability, and process improvement ability in the product design process;

2) Increase the requirements for raw materials of hot coil springs;

3) Added requirements for the manufacturing process and equipment of hot rolled cylindrical spiral compression springs;

4) Added requirements for product testing instruments.

Chapter 4.2.4 "Technical Requirements"

Based on the application characteristics of hot rolled cylindrical spiral compression springs and referring to the technical requirements of advanced domestic and foreign enterprises, this product standard has tightened certain performance requirements on the basis of referring to advanced peer product standards and high-end customer requirements, such as:

1) Strict requirements have been imposed on dimensional deviations and compression height in appearance and dimensions;

2) Added the requirement for permanent parallelism in hot compression to replace permanent parallelism, which better reflects product properties through experiments under customer demand limit states;

3) Increase the requirements for detecting harmful substances in products to ensure their safety;

4) Requirements for increasing fatigue life testing to ensure product durability:

5) Requirements for improving the uniformity of the end face;

Chapter 4.2.5 "Test Methods"

The product inspection methods and technical requirements correspond one-to-one, and the principles of detection and testing methods are consistent with national standards. However, according to the actual application of hot rolled cylindrical spiral compression springs,

Chapter 4.2.6 "Inspection Rules"

Product inspection is divided into factory inspection, acceptance inspection, and type inspection based on its status and needs.

The required type inspection situation is as follows:

Trial production and identification of new or old products for factory production;

When there are significant changes in structure, materials, and processes that may affect product performance after formal production;

During normal production, type inspection should be conducted once a year;

When the product is discontinued for more than six months and production resumes;

When there is a significant difference between the factory inspection results and the previous type inspection;

When the national quality supervision agency proposes the requirement for type inspection.

Chapter 4.2.7 "Labeling, Packaging, Transportation, and Storage"

The labeling, packaging, transportation, and storage of products will comply with the relevant national standard GB 3796.

4.2.11 "Quality Commitment" Chapter

According to the concept of "industrial coordination and social responsibility" advocated by Zhejiang Manufacturing, we solemnly promise in the standards:

1) The shelf life of this product is, provided that the user complies with relevant technical documents and agreements and operates normally. If any quality issues arise due to design or manufacturing reasons during the shelf life of the product, the design and manufacturing enterprise shall bear the responsibility

2) Manufacturing enterprises assume technical service responsibilities throughout the entire product lifecycle. Provide feedback on quality issues to customers (including end customers), respond within 24 hours, and promptly and properly resolve them through communication with customers.

5 Embodiment of standard progressiveness

5.1 Comparative analysis of all indicators specified in the type test. (Comparison with international, national, industry standards, and enterprise standards of similar products, comparative analysis of key indicators at home and abroad, or comparison with relevant data of tested foreign samples and prototypes.)

This standard is written with reference to the enterprise standards of domestic first-class manufacturers and industry general execution standards, and in combination with the company's understanding of product quality. Fully considering the development of spring production towards high precision, high strength, high durability, and high safety, as a hot rolled cylindrical spiral compression spring working in high-temperature and high-pressure environments, it has higher requirements for the durability and service life of the product. The standard includes comprehensive requirements for shot peening strength, shot peening coverage, hardness difference, permanent deformation, fatigue life, harmful substance limitation, verticality, and compaction height. The depth and breadth of the indicators have been supplemented and improved for the Hot Rolled Cylindrical Spiral Compression Spring.

The specific progressiveness is reflected as follows:

Technical indicators

◆ Project: Durability (hot compression permanent deformation/fatigue life)

◆ Explanation: Compared to the requirements of peers and customers, the height of permanent deformation has decreased by 0.1%, and the fatigue life regulation greatly improves the practicality of product life

Objective: To improve the lifespan of the product

Comparison of indicators:

◆

Project: Strength (shot peening intensity/shot peening coverage/hardness difference)

◆ Explanation: There is still a blank requirement in the existing domestic enterprise standards. In order to enhance the strength of hot coil compression springs, the parameters of shot peening strength and shot peening coverage have been added. Improve the hardness difference of the spring to enhance its overall performance.

Objective: To enhance the strength of the product

Comparison of indicators:

◆ Project: Accuracy (verticality/compression height)

◆ Explanation: Increase the vertical deviation value of the spring to ≤ 2.0% H, increase the pressure and height, and significantly improve the production accuracy of the product.

Objective: To improve product accuracy

Comparison of indicators:

◆ Project: Security

◆ Explanation: In order to ensure human health, testing for harmful substances in products has been increased. For example, the limits for cadmium, lead, cadmium, and hexavalent chromium should comply with the provisions of GB/T 30512.

Objective: To improve the safety of the product

Comparison of indicators:

5.2 Comparison of basic requirements (product design, raw materials, key technologies, processes, equipment and other aspects beyond the technical indicators specified in the type test), quality commitments and other relevant progressiveness that reflect the "four refined" characteristics of the "Made in Zhejiang" standard.

This standard has added basic requirements and quality commitments for product design, raw materials, processes, equipment, testing, and other aspects.

5.2.1 Design and development

Develop design software for lightweight design and complete design optimization.

Stress shot peening and heating treatment to increase the residual stress of the spring;

Adopting secondary strengthening shot peening technology to improve the fatigue resistance of springs and researching the use of new equipment for rapid tempering;

The research on material heat treatment adopts advanced water quenching technology.

5.2.2 Raw materials

Strict requirements have been put forward for hardness, tensile strength, lower yield strength, elongation after fracture, reduction of area, and harmful substance composition in the selection of raw materials:

Control items and indicators of raw materials for hot coil spiral compression springs

The mechanical properties mainly involve parameters such as permanent deformation and fatigue life, which control the mechanical properties of the main raw materials and limit harmful substances.

5.2.3 Manufacturing process and equipment

Springs should undergo stress relief tempering and surface strengthening treatment, and the hardness of the heat treatment should be assessed.

Springs with compressive stress ≥ 0.45Rm should be subjected to room temperature/heating standing treatment or strong pressure treatment.

Spring reinforcement should be surface shot peened in accordance with the requirements of GB/T 31214.1 and JB/T 10802 after grinding the spring.

Finite element analysis, corresponding analytical equipment for spectral analyzers.

The hardness of the spring after heat treatment should be evaluated, and its hardness should meet the requirements of the drawing. At the same time, the hardness difference of the same batch should be less than 3 HRC units.

It should be tempered martensite (oil quenched and tempered material), with a small amount of sorbite allowed.

Decarbonization of harmful substances is not allowed on the surface of the spring.

The original austenite grain size grade of spring products is generally not less than 5.

Springs should undergo shot peening strengthening treatment, which should be carried out in accordance with GB/T 31214.1 and JB/T 10802-2007. The shot peening strength should be (0.35-0.55) A, and the shot peening coverage rate should be ≥ 90%.

5.2.4 Detection capability

It should have the ability to detect indicators such as verticality, pressing height, shot peening strength, shot peening coverage, hardness difference, permanent deformation, fatigue life, and harmful substance limitation.

Should have the ability to inspect the entire product of hot rolled cylindrical spiral compression springs.

It should be equipped with metallographic equipment, spectral analyzer, material tensile testing machine, six component force testing machine, transverse load testing machine, locomotive spring specific fatigue testing machine, French made suspension spring specific fatigue testing machine, domestic suspension spring fatigue testing machine, magnetic particle testing equipment and other testing instruments.

5.2.5 Quality Commitment:

The product should have traceability.

The product has a shelf life of 2 years under normal transportation and storage conditions.

If there are any objections to the product quality, a response should be made within 24 hours and a solution should be provided to the customer in a timely manner.

5.3 Description of the standard that can reflect the progressiveness of "intelligent manufacturing" and "green manufacturing".

1) Current level of green manufacturing and intelligent manufacturing: Green manufacturing:

1. Our company values the concept of circular economy and adopts an economic development model characterized by resource conservation and circular utilization, which is harmonious with the environment. Emphasize organizing economic activities into a feedback process of "resource product renewable resources". Its characteristics are low mining, high utilization, and low emissions. All materials and energy can be reasonably and sustainably utilized in this continuous economic cycle to minimize the impact of economic activities on the natural environment. In the production process of gelatin hollow capsules, enterprises use circular economy methods to clean the discharged wastewater through the sewage treatment system, making it reach the level of clean water and achieving the recycling of water resources.

2. Our company adopts clean production to control the entire production process and product lifecycle. In the treatment of wastewater: a. Rainwater and sewage separation and clean separation are implemented for drainage, and the rainwater in the factory area is collected through rainwater pipes and discharged into nearby rivers; b、 A set of 8t/d sewage treatment facilities will be set up in the factory area, and the production wastewater will be included in the municipal sewage pipeline network after being treated to meet the standards; c、 After being treated in septic tanks, domestic sewage is discharged into the sewage pipe network of the Chengxi Development Zone in Zhuji City and sent to the Zhuji City Sewage Treatment Plant for treatment; d、 Standardize the setting of wastewater and rainwater discharge outlets, that is, set up sampling ports and obvious pollution discharge signs.

In the treatment of exhaust gas: a. The dust generated by shot peening is removed by a bag filter with a dust removal rate of 99% and discharged to the standard through a 15 meter high exhaust pipe; b、 Spray plastic dust is discharged after passing through a bag filter with a dust removal rate of 99% and reaching the standard through a 15 meter high exhaust pipe; c、 The oil fume exhaust gas (non methane total hydrocarbons) generated by the oil quenched steel wire production line and tempering furnace is collected by the gas collection hood and treated by an electrostatic range hood (with a purification rate of not less than 95%) to meet the standard before being discharged through a 15 meter high exhaust pipe; d、 The spray drying fuel uses natural gas, and the combustion waste gas is collected from the flue and discharged through a 15 meter high chimney to meet the standard; e、 Standardization of exhaust emission outlets, which means setting up permanent sampling holes and setting up pollution discharge signs.

In terms of noise treatment: a. When selecting production equipment, try to choose low noise and efficient equipment as much as possible; b、 When installing equipment, try to arrange it in the middle of the workshop and set shock absorbers at the bottom; c、 Install matching mufflers at the inlet and outlet of the dust collector fan; d、 Regular maintenance and upkeep of mechanical equipment.

In the treatment of solid waste: waste steel wire, shot blasting for dust collection, waste steel shot, and waste packaging materials are sorted and collected before being recycled and reused by material recycling companies; Spraying and dust collection will be used for production after collection; Waste engine oil, waste lubricating oil, waste liquid pressure oil, waste quenching oil, and waste oil collected by oil fume purifiers are all hazardous solid waste. They should be classified and collected before being placed in sealed barrels, and entrusted to Zhejiang Zhaoshan Environmental Protection Technology Co., Ltd. for treatment. During transportation, a hazardous waste transfer contact form should be issued to the local environmental protection department; The sludge and sediment generated by the sewage treatment plant are collected and dried before being entrusted to Zhejiang Zhaoshan Environmental Protection Technology Co., Ltd. for treatment; Household waste is collected in bags and disposed of daily at designated locations by the environmental sanitation department.

Intelligent manufacturing:

1. Our company adopts an ERP system to closely integrate the company's personnel, finance, materials, production, supply and marketing, as well as corresponding logistics, information flow, capital flow, management flow, value-added flow, etc., to achieve resource optimization and sharing. ERP has achieved the integration of our company's information system. Adopting a modular design approach has enhanced the company's adaptability.

2. Centralized data storage: Integrating data from various corners of the enterprise, ensuring consistency and improving accuracy. In an integrated environment, the information generated by our company's content can be accessed and applied anywhere in the enterprise through the system.

3. Improved management performance, ERP system will make horizontal connections between parts effective and close, resulting in improved management performance. By combining the ERP system with the Internet and supply management model, our company can closely integrate with raw material suppliers and increase their ability to adapt to market changes.

6. Coordination with current relevant laws, regulations, rules, and standards

6.1 The main standards currently implemented in China

At present, there are no international, national, or industry standards released for similar hot rolled cylindrical spiral compression spring products

Most industries have their own standards, so it is necessary and urgent to develop and release a set of "Hot Rolled Cylindrical Spiral Compression Springs" and "Made in Zhejiang" group standards, establish industry benchmark standards, promote the healthy development of advantageous industries in Zhejiang Province, and standardize the green pesticide industry.

6.2 Conflicts between this standard and relevant laws, regulations, rules, and mandatory standards

nothing

6.3 This standard references the following documents:

GB/T 224—2008   Determination of decarburization depth of steel

GB/T 230.1—2009   Rockwell hardness test for metallic materials Part 1: Test method

GB/T 231.1—2009   Metallic materials - Brinell hardness test - Part 1: Test method

GB/T 702—2017   Dimensions, shape, weight, and allowable deviations of hot-rolled steel bars

GB/T 1805—2001   Spring terminology

GB/T 6394—2017   Method for determining the average grain size of metals

GB/T 8170—2008   Rules for rounding off numerical values and representation and determination of limit values

GB/T 31214.1—2014   Spring shot peening Part 1: General principles

GB/T 10802—2007   Technical specification for spring shot peening strengthening

ISO 683-14—2004   Heat treated steel, alloy steel, and easily cut steel - Part 14: Hot rolled steel for quenched and tempered springs

ISO 9588—2007   Post coating treatment of metal and other inorganic coatings on steel to reduce the risk of hydrogen embrittlement

GB/T 1222—2016   Spring steel

GB/T 30512—2014   Requirements for prohibited substances in automobiles

GB/T 7367—2013   Magnetic particle testing method for cylindrical spiral compression springs

GB/T 23934—2015   Technical specifications for hot rolled cylindrical spiral compression springs

GB/T 13298—2015   Testing methods for microstructure of metals

GB/T 16947—2009   Specification for fatigue testing of spiral springs

GB/T 2827.1—2012   Sampling inspection procedures by attributes Part 1: Batch by batch inspection sampling plans indexed by acceptance quality limit (AQL)

The above referenced documents are currently valid.

7 Social benefits

Through standard guidance, promote the innovation and upgrading of hot coil cylindrical spiral compression spring production enterprises, enhance independent innovation capabilities, improve the performance and use of hot coil cylindrical spiral compression springs, reduce environmental pollution, and enhance the overall quality level and international competitiveness of China's spring product industry.

8. Process and basis for handling major disagreements and opinions

Currently unavailable

Suggestions for abolishing current relevant standards

Currently unavailable

10. Suggestions and reasons for mandatory or recommended implementation of standards

This standard is a group standard of the Zhejiang Provincial Brand Building Federation.

11. Requirements and Suggestions for Implementing Standards

The "Made in Zhejiang" standard has been approved for publication, and the text is published by the Zhejiang Provincial Brand Building Federation on its official website（ http://www.zhejiangmade.org.cn/ ）The full text will be published for free access by the society.

The main drafting unit of the standard will be on the enterprise standard information public service platform（ http://www.cpbz.gov.cn/ ）This standard is adopted for self declaration, and other units that adopt this standard should also make self declaration on the information platform.

12 Other matters that should be explained

None.

Standard Development Working Group for Hot Rolled Cylindrical Spiral Compression Springs

2020年8月14日