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QC/T 556-1999 (QC/T 556-2023 Newer Version) PDF English


QC/T 556-1999 (QC/T556-1999, QCT 556-1999, QCT556-1999)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
QC/T 556-2023English360 Add to Cart 0-9 seconds. Auto-delivery. Temperature measurement methods and thermocouple installation requirements for automobile brakes Valid
QC/T 556-1999English120 Add to Cart 0-9 seconds. Auto-delivery. Automobile Brake Temperature Measurement and Thermocouple Mounting Obsolete
Newer version: QC/T 556-2023     Standards related to (historical): QC/T 556-2023

QC/T 556-1999: PDF in English (QCT 556-1999)

QC/T 556-1999 QC NATIONAL AUTOMOBILE INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Replacing JB 3936-85 Automobile Brake Temperature Measurement and Thermocouple Mounting APPROVED ON. MARCH 15, 1999 IMPLEMENTED ON. MARCH 15, 1999 Approved by. State Administration of Machinery Industry Table of Contents 1 Measuring Device ... 3 2 Mounting of the Thermocouple ... 4 3 Measuring Method ... 5 4 Record and Draw Curve (Deal with the Brake Test Recording Table together with Curve)... 7 Appendix A (Reference) Technical Data of Standardized Thermocouple ... 8 Appendix B (Reference) K-value Table for Five Types of Thermocouples ... 9 Automobile Brake Temperature Measurement and Thermocouple Mounting This Standard is applicable to the temperature measurement during the automobile brake performance test. 1 Measuring Device 1.1 Thermocouple. thermocouple materials shall be selected reasonably; the standardized thermocouple wires are preferred (see Appendix A for the recommended thermocouple materials). Its diameter is 0.3~0.5mm, which shall meet the technical requirements for product exit-factory. Two types of thermocouple construction are recommended. 1.1 Plug thermocouple (see Figure 1). Figure 1 1.1.2 Armored thermocouple. the thermocouple made of thermocouple wires, insulating materials and metal sleeves through processing, welding and assembling; it can be ordered from the manufacturer as needed. 1.2 Display and recording device. reasonably select the secondary instrument for displaying and recording the dynamic temperature of the brake. Electronic potentiometer, DC digital voltmeter, digital thermometer, tape drive, light oscilloscope, etc. Their indicator errors shall be less than 5% of their measured value; while dynamic response time of the instrument shall be no greater than 0.2s. Steel tube Φ3 Thermocouple wire winding and silver welding Silver shall fill the inner hole 3.1.1 Separately mount the thermocouple as required in 2.1, 2.2, 2.3. 3.1.2 Install the temperature measuring instrument; use appropriate lead wire to connect with the thermocouple; place the free end of the thermocouple in the freezing device, thermostat or relatively stable room temperature as required. When it is necessary to use the compensation wire, pay attention to the matching between the compensation wire and the thermocouple materials. 3.1.3 When recording by a light oscilloscope or tape drive, the calibration device must be used to calibrate the used thermocouple together with recorder. 3.1.4 Adjust the measuring instrument, so that it can work normally. 3.1.5 Record the ambient temperature 3.2 Measure and record the brake temperature during the brake test. 3.2.1 Measurement of the brake lining (block) temperature. start the recorder; record the temperature change during the braking process; record the temperature change within 15s after the brake drum (disc) stops rotating (brake action is not released), if necessary. 3.2.2 Measurement of brake drum (disc) temperature. start the recorder; record the temperature change during the braking process. 3.2.3 Measurement of brake fluid temperature. start the recorder; record the temperature change of the brake fluid during the test; record the temperature once every 1min after the completion of the test (brake action is released) till the temperature begins to decline significantly. 3.3 Temperature compensation when the free end of the thermocouple is not 0°C. 3.3.1 Correction factor method. Where. t - measured temperature; ti – indication temperature of the instrument; t0 – temperature on the free end; K – correction factor, different thermocouple has different K value. See Appendix B. 3.3.2 Adjust the starting point of the instrument. disconnect the measuring line; adjust the pointer of the instrument to t0; close the measuring line during the measuring ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.