GB/T 25751-2010 English PDFUS$349.00 · In stock
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Basic dataStandard ID: GB/T 25751-2010 (GB/T25751-2010)Description (Translated English): Compression gas spring technical specification Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J26 Classification of International Standard: 21.160 Word Count Estimation: 15,194 Date of Issue: 2010-10-23 Date of Implementation: 2011-10-01 Quoted Standard: GB/T 1771; GB/T 1800.1; GB/T 1805; GB/T 2348; GB/T 2349; GB/T 2828.1; GB/T 2829; GB/T 10125; QC/T 484; QC/T 625 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the compressed gas spring (hereinafter referred to as gas spring) terms and definitions, marking, technical requirements, test methods, inspection rules and identification, packaging, transport, storage requirements. This standard applies to nitrogen or other inert gas as the working medium gas storage spring. GB/T 25751-2010: Compression gas spring technical specification---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Compression gas spring technical specification ICS 21.160 J26 National Standards of People's Republic of China Technical conditions of compressed gas spring Released on.2010-12-23 2011-10-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Issued by China National Standardization Administration ForewordThis standard was proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the National Spring Standardization Technical Committee. Responsible for drafting this standard. Beijing Third Textile Machinery Co., Ltd., Changzhou Gas Spring Co., Ltd., China Machinery Productivity Promotion Center. Participated in the drafting of this standard. Beijing Jixin Gas Spring Products Co., Ltd., Kunshan Jinfa Hydraulic Machinery Co., Ltd., Lanxi Shuangguan Automobile Auto Parts Manufacturing Co., Ltd., Shanghai Zhenfei Auto Parts Co., Ltd., Ningbo Economic and Technological Development Zone Yili Damper Co., Ltd., Nanjing Zhongqiang Gas Spring Manufacturing Co., Ltd., Fenghua Renlong Machinery Co., Ltd., Leiyan Nitrogen Spring Technology and Equipment Research Institute, Guizhou Longfei Gas Bomb Spring limited liability company. The main drafters of this standard. Wei Youcai, Shi Yuqiu, Jiang Ying, Shi Yuxiao, Liang Yimin, Ning Cheng, Zhou Zhengming, Dou Zhi, Wu Xiaoyan, Yu Yu, Ying Duanzhong, Luo Minglai, Dong Xigang, Yin Jungang. Technical conditions of compressed gas spring1 ScopeThis standard specifies the terms and definitions, markings, technical requirements, test methods, inspection rules and Labeling, packaging, transportation, storage requirements, etc. This standard applies to gas springs that use nitrogen or other inert gases as the energy storage working medium.2 Normative referencesThe clauses in the following documents become clauses of this standard after being quoted. For dated reference documents, all subsequent The amendments (not including errata content) or revisions do not apply to this standard. However, all parties that have reached an agreement based on this standard are encouraged to study Check whether the latest versions of these files can be used. For undated reference documents, the latest version applies to this standard. GB/T 1771 Determination of neutral salt spray resistance of paints and varnishes (GB/T 1771-2007, ISO 7253.1996, IDT) GB/T 1800.1 Geometric Technical Specification for Products (GPS) Limits and Fits Part 1.Tolerances, Deviations and Basis of Fits (GB/T 1800.1-2009, ISO 286-1.1988, MOD) GB/T 1805 Spring term GB/T 2348 hydraulic pneumatic system and components cylinder inner diameter and piston rod outer diameter (GB/T 2348-1993, neqISO 3320.1987) GB/T 2349 Hydraulic pneumatic system and component cylinder piston stroke series GB/T 2828.1 Sampling inspection procedure by attributes Part 1.Batch inspection sampling plan retrieved by acceptance quality limit (AQL) (GB/T 2828.1-2003, ISO 2859-1.1999, IDT) GB/T 2829 Periodic Inspection Attribute Sampling Procedure and Table (Applicable to the Inspection of Process Stability) GB/T 10125 artificial atmosphere corrosion test salt spray test (GB/T 10125-1997, eqvISO 9227.1990) QC/T 484 Automotive paint coating QC/T 625 coating and chemical treatment layer for automobile 3 Terms, definitions, symbols and descriptions The terms, definitions, symbols and descriptions established in GB/T 1805 and Table 1 apply to this standard.5 mark5.1 Marking method The gas spring is marked by the code, piston rod diameter (optional), cylinder outer diameter (optional), stroke, extension length and nominal force value group to make. The regulations are as follows. 5.2 Marking example Example 1.The diameter of the piston rod of the compressed gas spring is 10mm, the outer diameter of the cylinder is 22mm, the stroke is.200mm, the extension length is 500mm, and the minimum extension The spreading force F1 (lifting force) is 650N. Marked as. YQ10/22-200-500F1650 or YQ200-500F1650 Example 2.The diameter of the piston rod of the compressed gas spring is 8mm, the outer diameter of the cylinder is 18mm, the stroke is 150mm, the extension length is 400mm, and the nominal force Fa is 350N. Marked as. YQ8/18-150-400Fa350 or YQ150-400Fa3506 Technical requirementsProducts should meet the requirements of this standard, and be manufactured in accordance with product drawings and technical documents confirmed by both the supplier and the buyer. Materials selected for manufacturing products Materials and coatings should comply with the safety and environmental protection regulations of the application area. 6.1 Dimensions and appearance quality 6.1.1 D2/D1 should not be less than 1.1, the diameter and stroke of the gas spring piston rod should be selected according to GB/T 2348 and GB/T 2349, special requirements The demand is negotiated between the supplier and the buyer. 6.1.2 The extension length tolerance of the gas spring should comply with the IT16 level accuracy of GB/T 1800.1. 6.1.3 The coating layer of the gas spring piston rod should be uniform, the surface should be smooth, and there should be no defects such as scars, blistering, peeling, pitting, pinholes, nodules, etc. 6.1.4 The coating layer of other exposed parts except the piston rod should be uniform, and there should be no red rust, peeling, blistering, roughness and missing plating (process holes and small holes). Except for 1mm holes) and other defects. 6.1.5 The paint coating of the gas spring cylinder barrel should meet the requirements of QC/T 484.The paint coating should be uniform, and there should be no exposed bottom, obvious pitting, serious Sagging. 6.2 Force characteristics For gas springs with a nominal force greater than 100N, the force value should be determined by an integer multiple of 50N. The gas spring does not There should be jamming and obvious jitter. 6.2.1 Nominal force F× and dynamic friction force Fr The limit deviation of the nominal force value and the dynamic friction force should meet the requirements of Table 2.In case of special needs, it shall be negotiated by both parties. 6.2.2 Starting force F0 The starting force of the gas spring should be less than 1.5F3. 6.2.3 Elastic force ratio α The elastic force ratio of the gas spring is determined by the supplier and the buyer according to the usage. 6.2.4 Liquid damping section The length of the liquid damping section of the gas spring is determined by the supplier and the buyer according to the load. 6.3 Stretching speed v The gas spring extension speed v should be between 50mm/s~350mm/s. In case of special needs, it shall be negotiated by both parties. 6.4 High and low temperature resistance After the gas spring is stored at a high temperature of 110°C, and then subjected to two high and low temperature cycle tests at -40°C and 80°C, it should not fail. The attenuation of the weighing force Fa should not exceed 5%. 6.5 Cycle life 6.5.1 Room temperature cycle life After the high and low temperature test, the gas spring has a cycle life of 25,000 times (when the stroke is ≤200 mm, the actual stroke is When the distance is greater than.200mm, according to the.200mm stroke) After the test, the total attenuation of the nominal force Fa should not exceed 13%, and the dynamic friction force should conform to According to Table 2, the amount of oil carried should be less than 0.5g. 6.5.2 Environmental cycle life After the gas spring with harsh operating environment has been tested by -40℃1000 times and 80℃1000 times high and low temperature dynamic cycle life test, its nominal force The attenuation of Fa should not exceed 5%. The gas spring that has undergone the high and low temperature dynamic cycle life test, and then the cycle life of 18,000 times (stroke ≤200mm, according to the actual stroke; when the stroke >200mm, according to the.200mm stroke) After the test, the total attenuation of the nominal force Fa should not be More than 13%, its dynamic friction force should meet the requirements of Table 2, and the amount of oil carried should be less than 0.5g. Note 1.6.5.1 and 6.5.2 are not required at the same time. Note 2.6.4 should not be required when 6.5.2 is required. 6.6 Tensile performance The tensile performance of gas spring products should meet the requirements of Table 3. 6.7 Corrosion resistance 6.7.1 After the gas spring has undergone a 96h neutral salt spray test, there should be no blistering, peeling and corrosion defects; the rod end, pipe end thread and orifice should not be Soaking and peeling. 6.7.2 After the hard chromium-plated piston rod has been subjected to a 48h neutral salt spray test, its shaft shall not have blistering, peeling and corrosion defects; rod end thread and orifice There should be no blistering or peeling. 6.7.3 The corrosion resistance of other exposed parts shall comply with the corresponding coating and plating regulations in QC/T 625.For special needs, the supply and demand parties Agreed.7 Test method7.1 Dimensions and appearance 7.1.1 The size shall be inspected with special or general-purpose measuring tools with a division value not greater than 0.5mm. 7.1.2 Visual inspection is used for appearance quality. 7.2 Force characteristics 7.2.1 Test conditions The test is carried out in an environment of 20℃±2℃. Before the test, the gas spring is always in the extended state, and the piston rod must not be pressed. And put the sample Put it at 20℃±2℃ for more than 2h. The test measurement speed is 400mm/min, and the force measurement accuracy is not less than 1%. Note. The test speed of variable damping gas spring and compression damping gas spring is 100mm/min~300mm/min. 7.2.2 Test method The force characteristic test method is divided into dynamic test and static test. The dynamic test method should be adopted as far as possible. 7.2.2.1 Dynamic test Clamp the gas spring piston rod upward and vertically on the testing machine, start the first cycle to record the starting force; the second cycle to record the force point C Place the extension and compression forces F1, F2, F3, F4, calculate the ratio of nominal force, dynamic friction and elastic force, and draw a force-displacement curve. Simultaneous observation Whether the gas spring piston rod has jamming and obvious shaking. 7.2.2.2 Static test Clamp the gas spring piston rod upward and vertically on the testing machine, start the first cycle to record the starting force; the second cycle to record the force point C The extension force and compression force F1, F2, F3, F4 at the position, and calculate the ratio of nominal force and elastic force, draw a force-displacement curve. Static test force point C The residence time is 3s, and at the same time observe whether the gas spring piston rod has jamming and obvious shaking. 7.3 Stretching speed 7.3.1 Test conditions The test is carried out in an environment of 20℃±2℃. The sample should be placed in an environment of 20℃±2℃ for more than 2 hours before testing. The degree value is not more than 1/100s. 7.3.2 Test method Clamp the gas spring piston rod vertically downward on the testing machine, turn on the testing machine, press in the piston rod according to the specified stroke, and then remove the external force Make the piston rod extend freely, measure the extension time t and the extension stroke S, and calculate the extension speed (average speed) v according to the following formula. Place the gas spring in a high temperature test box at 110℃±5℃ for 1h, and place it in a normal temperature environment for 2h after taking it out. And then the gas spring Place the gas spring in an environment of -40℃±2℃ for 4h, then place the gas spring in an environment of 80℃±5℃ for 4h, the above is a high and low temperature cycle test Test. The gas spring that has undergone high and low temperature tests is tested for force characteristics according to 7.2, and the attenuation of the nominal force Fa is calculated. 7.5 Cycle life 7.5.1 Normal temperature cycle life After the high and low temperature test, the gas spring piston rod is clamped down on the testing machine with oil collecting device, and the speed is 4 times/min~6 times/min (change The damping gas spring and compressed damping gas spring are tested at the frequency of 3 times/min~5 times/min), and the piston rod should be freely extended during the test. After the cycle is 25000 times, the force characteristics are tested according to 7.2, and the attenuation of the nominal force Fa is calculated, and then the electronic accuracy is not less than 0.01g. Weigh the amount of oil carried out on the scale. During the test, the temperature of the gas spring cylinder shall not exceed 50°C. 7.5.2 Environmental cycle life Clamp the gas spring piston rod downwards on the high and low temperature dynamic cycle testing machine with oil collecting device, and the test environment temperature drops to -40℃, carry out 1000 cycles life test at the frequency of 2 times/min~4 times/min, after taking it out, according to 7.2 detection force characteristics, and calculate The attenuation of the nominal force Fa. Then clamp the gas spring on the testing machine, and increase the test environment temperature to 80℃±5℃, 4 times/min~ Perform 1000 cycles of life test at a frequency of 6 times/min (variable damping gas springs and compressed damping gas springs are 2 times/min~5 times/min). After output, check the force characteristics according to 7.2, and calculate the attenuation of the nominal force Fa; then weigh the oil belt on an electronic scale with an accuracy of not less than 0.01g Calculate the attenuation of the nominal force Fa, and then weigh the amount of oil carried out on an electronic scale with an accuracy of not less than 0.01g. 7.6 Tensile performance Fix the stretched gas spring on the testing machine, load it according to the specified value in Table 3 at a speed of 1mm/min~2mm/min, and keep it 3min, after unloading, press 7.2 to detect force characteristics or observe. 7.7 Corrosion resistance The corrosion resistance test of gas spring shall be carried out according to GB/T 1771 or GB/T 10125.8 Inspection rules8.1 Defects The gas spring does not meet the technical requirements specified in the product technical standards and drawings, which constitutes a defect. According to the severity of the defect, it is divided into. 8.2 Sampling method 8.2.1 Inspection lot a) The inspection lot must be qualified gas spring products, and 280 gas springs are an inspection lot. If the product quantity is greater than 280 pieces, the inspection The inspectors arbitrarily divide a number of inspection lots with 280 pieces as a batch, and then randomly determine an inspection lot as the random inspection object. b) If the product quantity is less than 280 pieces, it is not suitable for sampling as an inspection lot. In addition, stock products should be selected for sampling, or For the actual batch, look up the corresponding code and select samples in Table 1 of GB/T 2828.1. 8.2.2 Sample selection 8.2.2.1 The non-destructive inspection items share one sample. If the quantity of the product is greater than 150 pieces, it shall be in accordance with the general requirements specified in GB/T 2828.1. Inspection level I, sample size code E, according to the normal inspection once sampling plan, sample 13 gas springs; if the number of products is not greater than 150 pieces, then select samples according to 8.2.1 b). 8.2.2.2 The high and low temperature resistance performance, cycle life, tensile performance, and corrosion resistance test are destructive tests, which are type test items. Special inspection level S-1 specified in GB/T 2828.1, sample size code B, one-time sampling plan for normal inspection, force characteristics, high and low temperature resistance The performance, cycle life, and tensile performance tests share one set of samples, and one set of samples is used for the corrosion resistance test, each with 3 gas springs. 8.2.3 Receive quality limit AQL and receive number Ac The acceptance quality limit for defective items A and B is 4.0, and the number of acceptances is 0. The receiving quality limit of C defect item is 6.5, when the word code is E, the receiving number is 2; when the word code is D, the receiving number is 1. 8.2.4 According to the degree of stability of product quality, according to GB/T 2828.1 transfer rules, between normal inspection, relaxed inspection, and stricter inspection Make the transfer. When the inspection is relaxed, the general inspection level I, the sample size code E, according to the relaxed inspection one sampling plan, and 5 gas bombs Spring sample; when the sample size code is D and B, 3 and 2 gas springs are sampled respectively; when the inspection is tightened, the sampling number is the same as 8.2.2. 8.3 Inspection classification Product inspection is divided into factory inspection and type inspection. 8.3.1 Factory inspection All products must undergo final inspection before delivery. The inspection items are shown in Table 5. 8.3.2 Type inspection In one of the following situations, type inspection should generally be carried out. a) When a new product or an old product is converted to a finalized appraisal; b) When the design, structure, material, and process of the product have changed significantly; c) When there are major changes in key process equipment and personnel; d) After a certain period of normal production series products; e) When the product has major quality problems; f) When the product is stopped for more than one year and then put into production; g) When the factory inspection result is significantly different from the last type inspection; h) When the national quality supervision agency requests for type inspection. The type test of d) and h) shall be carried out according to 8.2.Other type inspections shall be carried out in accordance with the provisions of GB/T 2829, and 6 gas springs shall be sampled. 3 groups, 2 in each group, check according to Table 6. 9 Identification, packaging, transportation and storage 9.1 Safety signs Each gas spring product must be marked with a safety mark in an obvious place. 9.2 Product identification Each gas spring product should be marked with the following content agreed by the supplier and the buyer in an obvious position. a) The buyer's or supplier's trademark; b) Product code, model or part number; c) Supplier's name, code or demander's name; d) Delivery date or production batch number. 9.3 Box identification The gas spring packaging box should have the following contents agreed by the supplier and the buyer. b) The name, code or address of the supplier and buyer; c) the number of products; d) Overall dimensions, gross weight and net weight; e) production date; f) Mark "Beware of high temperature", "Handle with care", etc. 9.4 Packaging 9.4.1 There should be flexible material protection between each gas spring in the packing box. 9.4.2 The gross weight of each box should not be greater than 30kg. 9.4.3 A certificate of conformity stamped by the quality department should be attached to the packing box. 9.4.4 The materials of the packing box shall be negotiated between the supplier and the buyer. 9.5 Transport Shipment according to the transportation method agreed by the supplier and the......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25751-2010_English be delivered?Answer: Upon your order, we will start to translate GB/T 25751-2010_English as soon as possible, and keep you informed of the progress. 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