GB 26753-2011Rubber diaphragms for brake chamber in automobile (English PDF)

Foreword

3.4,3.5,3.6,3.7,3.8 this standard is mandatory, the rest are recommended.

This standard was drafted in accordance with GB/T 1.1-2009 given rules.

The standard proposed by China Petroleum and Chemical Industry Association.

This standard by the National Rubber and rubber products sealing products Standardization Technical Committee Technical Committee (SAC/TC35/SC3) Centralized.

This standard was drafted. Guizhou public Rubber Co., Ningboqiaoshi Rubber Co., Ltd., Anhui Ding seals Co., Ltd., Qingdao Beihai Sealing Technology Co., Ltd. Northwest Rubber Plastic Research and Design Institute, Zhuzhou Times New Material Technology Co., Ltd., Chongqing Cafu Steering Automotive Brake System Co., Ltd.

1 Scope

This standard specifies the automobile brake chamber rubber diaphragm (hereinafter referred to as the diaphragm) requirements, test methods, inspection rules and signs, packaging, transportation Transport and storage.

This standard applies to automobile brake chamber with a rubber septum.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 528 Determination of vulcanized rubber or thermoplastic rubber tensile stress-strain properties GB/T 531.1 vulcanized rubber or thermoplastic rubber hardness test pushed Part 1. Shore hardness method (Shore hardness) Determination of GB/T 532 vulcanized rubber or thermoplastic rubber and fabric adhesive strength GB/T 1682 Determination of vulcanized rubber low temperature brittleness Single Specimen GB/T 2828.1 Sampling procedures for inspection - Part 1. by acceptance quality limit (AQL) retrieval batch inspection sampling plan GB/T 2941 rubber physical test method for preparing and conditioning General Procedure GB/T 3512 vulcanized rubber or thermoplastic rubber hot air and heat accelerated aging test GB/T 5721 rubber seal products logo, packaging, transportation and storage of general provisions GB/T 7759 vulcanized rubber, thermoplastic rubber at room temperature, high and low temperature compression set determination QC/T 790-2007 brake chamber performance requirements and test methods of

3 Requirements

4 Compression set (70 °C × 24h) /% maximum 353,535

5 Brittle temperature/°C highest -45-45-45

A hot air aging

Change in hardness (Shore A) Tensile strength change rate /% maximum Elongation at break change rate /% maximum-5 To 10-25-30-5 To 10-25-30 0-5-15-25

Table 1 (continued)

No. Physical Performance 7 and the adhesive strength of the vulcanized rubber fabric/(kN/m) Minimum 668 for a material hardness of 50 ± 5 and 60 ± 5, the hot air aging conditions of 70 °C × 72h, the hardness of 68 ± 5 material, hot air aging strip Member of 80 °C × 72h.

3.2 Reinforcements

Manufacturing membrane materials used comply with the relevant standard requirements of customers.

3.3 diaphragm size

Membrane is shown in Figure 1, the separator should be sized in accordance with Table 2 or drawings of design requirements.

1 a schematic diagram of the diaphragm

Table 2 diaphragm dimensions and tolerances in millimeters

Type phiD (outside diameter) H (full height) t (bottom thickness) TYPE09 127.8 ± 1.5 34.4 ± 0.7 3.2 ± 0.3 TYPE12 139.0 ± 1.5 37.0 ± 0.7 3.0 ± 0.3 TYPE14 147.0 ± 1.5 37.0 ± 0.7 3.0 ± 0.3 TYPE16 158.0 ± 1.5 34.4 ± 0.7 3.2 ± 0.3 TYPE20 169.7 ± 1.5 34.4 ± 0.7 3.2 ± 0.3 TYPE24 178.0 ± 1.5 40.0 ± 0.7 4.0 ± 0.3 TYPE28 188.5 ± 1.5 39.5 ± 0.7 3.2 ± 0.3 TYPE30 201.0 ± 1.5 39.5 ± 0.7 3.0 ± 0.3 TYPE36 221.0 ± 1.5 43.0 ± 0.7 3.6 ± 0.3 3.4 appearance quality diaphragm Appearance quality should be consistent with the provisions of the diaphragm in Table 3.

Table 3 Appearance Quality diaphragm

No. Name Index defect 1 mold marks are allowed, but the unevenness of not more than 0.3mm, grow up to 1.5mm 2 bubble diameter of not more than 2mm, no more than 0.5mm deep bubbles, allowed many to 2 3 impurity has not allowed 4 missing glue grow up to 2mm, width is not more than 1.5mm, depth of not more than 0.5mm, allowed many to 2 5 fabric fracture has not allowed 6 trimming deep damage is not greater than 1mm, a total length of no more than 1/6 of the perimeter 7 edge burrs projecting high not permit more than 1mm

8 Flow marks (including water ripples and minor pitting) are allowed, but not allowed to have split 9 surrounding the lack of cloth have not allowed the cumulative total number of 10 defective item No. 2,4 defects are not allowed more than four 3.5 diaphragm pressure resistance After the pressure test, the membrane should be intact, no damage, and the sealing performance should meet the QC/T 790-2007 requirements of 5.1.

3.6 cryogenic sealing septum Low temperature sealing performance should meet the QC/T 790-2007 requirements of 5.4.

3.7 cryogenic operating characteristics of the membrane Diaphragm after the test should not have visible cracks and damage. And shall meet the QC/T 790-2007 requirements of 5.7.

3.8 diaphragm life

Diaphragm life of 100 million times (400,000 times at room temperature; various high and low temperature 100,000 times; and then at room temperature 400,000 times), after testing the product in good condition, no damage.

Test Method 4

4.1 Preparation of vulcanized rubber samples conducted in accordance with GB/T 2941's.

4.2 hardness according to GB/T 531.1 requirements.

4.3 tensile strength, elongation at break were by GB/T 528 requirements.

4.4 Compression set according to the provisions of GB/T 7759 progresses, type B samples.

4.5 hot air aging according to the provisions of GB/T 3512 will be.

4.6 brittleness temperature according to the provisions of GB/T 1682 will be.

4.7 adhesive strength of the vulcanized rubber and fabric conducted in accordance with GB/T 532's.

4.8 diaphragm size measurement according to the provisions of GB/T 2941 will be.

4.9 appearance quality diaphragm visually and indexing is 0.02mm gage measurements.

Diaphragm pressure resistance was 4.10 according to the provisions in 6.10.1.2 QC/T 790-2007.

4.11 low temperature sealing performance diaphragm conducted in accordance with QC/T 790-2007 in 6.5.

Low temperature characteristics 4.12 diaphragm conducted in accordance with QC/T 790-2007 in 6.8.

4.13 diaphragm life test conducted according to the provisions of Appendix A.

5 Inspection Rules

5.1 Continuous production of the same compounds in not more than 5000kg batch.

5.2 In the same conditions, continuous production and delivery of the first test of its kind, with product specifications to no more than 10,000 batch.

The physical properties of the vulcanized rubber test should be 5.3 per roll rubber compound random number required, sample preparation conditions prescribed, according to

Table 1 1 to 3 and Item 7 factory inspection; Table 1, item 4 and item 6 test once a month.

5.4 Unless otherwise specified, each batch separator size according to the GB/T 2828.1 general test level II, AQL sampling is 4.0 test.

5.5 diaphragm should look checking each item.

5.6 diaphragm pressure resistance, low temperature sealing performance, low temperature performance and life test at least once every six months.

5.7 Type inspection should include all the requirements of Chapter 3, when one of the following conditions, type of inspection should be carried out.

--- The product to the plant (to change the production site) the production or appraisement time;

--- After the official production, such as materials, processes are at greater change may affect product performance;

--- Product discontinuation more than three months, the production recovery;

--- Factory inspection results are quite different when the last type inspection;

--- National quality supervision agency type inspection requirements.

5.8 When the physical properties of vulcanized rubber failure, double the sample to be taken for the project failed re-inspection, if still unqualified, the batch separator to be defective.

5.9 When unqualified appearance quality diaphragm, the diaphragm is defective. When the diaphragm pressure resistance, low temperature sealing performance, low temperature Work performance and life test failure should be taken twice the sample retest, if still unqualified, the batch separator to be defective.

6 Signs, packaging, transportation and storage

6.1 Unless otherwise specified, marking, packaging, transportation and storage should be consistent with GB/T 5721 regulations.

6.2 Unless otherwise specified, each packaging shall be fitted with a specification of the product.

6.3 Subject to the provisions of 6.1 and 6.2 for storage conditions of the product is 2 years.

Appendix A

(Normative)

Automobile brake chamber rubber diaphragm life test method A.1 means Life test apparatus shall comply with the diaphragm QC/T 790-2007 requirements of 6.11.

A.2 Sample

3.1,3.2,3.3,3.4 should comply with the requirements of a number of randomly selected membrane 4 to 6 as a sample, the sample structure and main dimensions see picture 1.

Preparation before A.3 Test Sample before assembly, inspection chamber of the main part size, appearance quality should be consistent with the provisions of QC/T 790-2007 in.

A.4 Test procedure

A.4.1 The test brake chamber secured to the holder, samples were mounted in the brake chamber piston and correcting the position of the specimen, so that the two Respectively, in a free state, with a tight clamp hoop.

A.4.2 Limit seat adjustment nut to reach full stroke 0.75SN ± 0.05SN.

NOTE. SN refers to the manufacturer's technical documentation specified brake chamber push rod stroke of work.

A.4.3 power, gas supply, adjust the air pressure regulator to 0.7 0.2-0.1MPa.

A.4.4 room temperature sealing at a temperature of (27 ± 11) placed under °C 2h, air pressure is applied 0.7 0.2-0.1MPa, packing 1min, the pressure drop is not greater than 10kPa.

A.4.5 low temperature sealing at a temperature of (-40 ± 2) placed under °C 16h, air pressure is applied 0.7 0.2-0.1MPa, packing 1min, the pressure drop is not greater than 10kPa.

A.4.6 high temperature sealing at a temperature of (80 ± 5) placed under °C 16h, air pressure is applied 0.7 0.2-0.1MPa, packing 1min, the pressure drop is not greater than 10kPa.

A.4.7 Dynamic room temperature at a temperature of (27 ± 11) °C, the air pressure is applied 0.7 0.2-0.1 MPa, working stroke. 0.75SN ± 0.05SN, frequency (15 ± 1) times/min, count Reached 400,000 times the test is stopped, to see if there is a leak. Air pressure is applied 0.7 0.2-0.1 MPa, holding pressure 1min, the pressure drop is not greater than 10kPa.

A.4.8 low dynamic

At a temperature of (-40 ± 2) at °C, air pressure is applied 0.7 0.2-0.1MPa, working stroke. 0.75SN ± 0.05SN, frequency (10 ± 1) times/min, count Reached 100,000 times the test is stopped, to see if there is a leak. Air pressure is applied 0.7 0.2-0.1 MPa, holding pressure 1min, the pressure drop is not greater than 10kPa.

A.4.9 Dynamic temperature at a temperature of (80 ± 2) at °C, air pressure is applied 0.7 0.2-0.1MPa, working stroke. 0.75SN ± 0.05SN, frequency (6 ± 1) times/min, count Reached 100,000 times the test is stopped, to see if there is a leak. Air pressure is applied 0.7 0.2-0.1 MPa, holding pressure 1min, the pressure drop is not greater than 10kPa.

A.4.10 Dynamic room temperature A.4.7 press once again. Stop the test count reaches 400,000 (a total of up to 100 million times) when.

A.4.11 at a temperature of (27 ± 11) °C, sample at 0.7 0.2-0.1 MPa pressure, packing 1min, observe the pressure drop is not greater than 10kPa; open observation chamber brake chamber rubber diaphragm (sample) should be no damage.

A.4.12 each intake time is less than 0.6s.

A.4.13 When the counter reading totaled one million times (also available in terms of the actual test time), the end of the test, the testing process each order Failure of any one segment judges failed the test.