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QC/T 15-1992 Related PDF English

QC/T 15-1992 (QC/T15-1992, QCT 15-1992, QCT15-1992) & related versions
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QC/T 15-92 QC AUTOMOTIVE INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA T 05 General test methods for automotive plastic products ISSUED ON. MAY 21, 1992 IMPLEMENTED ON. JUNE 1, 1993 Issued by. China Automotive Industry Corporation Table of Contents 1 Subject contents and application scope ... 3  2 Normative references ... 3  3 Test items ... 3  4 General test conditions ... 4  5 Test methods ... 5  6 Evaluation items ... 24  7 Test report ... 26  Additional explanations... 26  General test methods for automotive plastic products 1 Subject contents and application scope This Standard specifies the general test methods for automobile plastic molding products (hereinafter referred as products). This Standard is applicable to automobile plastic products but not to foaming products, seats, electroplated products and coating products. 2 Normative references GB 209 Sodium hydroxide for industrial use GB 252 General diesel fuels GB 435 Gasoline engine oil GB 484 Vehicle used gasoline GB 534 Industrial sulfuric acid GB 2918 Plastics – Standard atmospheres for conditioning and testing GB 5671 Lithium base grease for general purpose automobile JB 3979 Test methods for automobile steering-wheel QC/T 17 General rules for automative part weathering test SY 4005 No.4604 synthetic brake oil 3 Test items Test items include the 11 items as follows. a. temperature resistance test; b. weathering resistance test; c. water resisting test; d. wet resistance test; e. chemical reagents resistance test; f. vibration resistance test; g. impact resistance test; h. wear resistance test; i. scratch resistance test; j. rigidity test; k. comprehensive test. 4 General test conditions 4.1 Standard environment conditions The standard environment conditions are prescribed in GB 2918. 4.2 Specimen The product which has been assembled and available for use can be used in a test as the specimen. However, test piece which is simulative to the state of the product that is actually used in an automobile can also be used if not affecting the properties of product. 4.3 Pre-treatment of specimen The specimen, randomly selected from the products which have been placed for at least 24h since manufacturing, cannot undergo a test until being placed in the environmental conditions as stipulated in 4.1 for no less than 4h or in other conditions agreed by supplier and buyer if required. 4.4 Quantity of specimen Unless otherwise specified, the quantity of specimen shall be in accordance with Table 1. Table 1 Test purpose Quantity of specimen Qualitative test At least 3 Quantitative test At least 5 the specimen submerged; e. In principle, when the specimen is taken out from different environments for each cycle, inspection shall be carried out according to the test items in article 6. 5.2 Weathering test Weathering test shall be carried out in accordance with QC/T 17. 5.3 Water resisting test Water resisting test is to examine the variation of product in water absorption when directly contacting water during use. Submerge the specimen which has been pre-treated in the standard environment as stipulated in article 4.1 in the constant temperature test bath at 40±1°C or actually working temperature for at least 200h. Take it out and wipe it clean with dry cleaning cloth. Then put it in the standard environment for cooling for 1h. Conduct the inspection to the specimen according to the test items in article 6. In principle, the water used in test shall be >105Ω deionized water. 5.4 Wet resistance test Wet resistance test is to examine the variation of product brought by moisture absorption. 5.4.1 Classification of test Tests are classified into 3 types as shown in Table 8 according to the environmental impact to the product. Table 8 Test conditions Test classification Temperature °C Relative humidity % Applicable scope Type 1 70±2 Above 90 The product exposed at high temperature and high humidity conditions Type 2 55±1 Above 95 General product Type 3 40±1 Above 90 5.4.2 Test methods Pre-treat the specimen according to 4.3; then put it in the constant temperature and humidity chamber as stipulated in article 8 for at least 96h. Take it out and wipe it clean with the dry cleaning cloth. Put in the standard environment as stipulated in 4.1 for cooling for 1h; examine the specimen according to the test items as stipulated in article 6. 5.5 Chemical medium resistance test stipulated in Table 11. Examine the specimen according to the items as stipulated in article 6. Table 11 SN Cleaning method Drying method The placing time after drying (h) 1, 2, 3, 4, 8, 9, 10 Remove oil dirt with petroleum ether Dry for 10 ~ 20min at 50°C or lower constant temperature chamber 1 5, 6, 7 Remove dirt with ethyl alcohol 11, 12, 13, 14 Wash with water instantly to make it not acid or alkaline Dry for 2 ~ 3h at 50°C or lower constant temperature chamber 5.5.3.3 Dropping test a. Dropping test at room temperature Use injector or gauze to spread the chemical medium as stipulated in Table 10 on the surface of specimen at the standard environment. Place it for the prescribed time duration; treat the specimen according to the method as stipulated in Table 11. Examine the specimen according to the items as stipulated in article 6. b. High temperature dropping test Use injector or gauze to spread the chemical medium as stipulated in Table 10 on the surface of specimen at the standard environment. Place it for the prescribed time duration at the temperature as agreed by supplier and buyer. Cool it to room temperature; treat the specimen according to the method as stipulated in Table 11. Examine the specimen according to the items as stipulated in article 6. 5.6 Vibration resistance test The purpose of this test is to examine the vibration resistance of product. 5.6.1 Classification of test a. Resonance point determination test Determine the resonance frequency and accelerated velocity of product which is used to approximately evaluate or compare the dynamic rigidity of product. b. Vibration endurance test Examine the endurance of product to vibration. 5.6.2 Classification of vibration conditions. The classification of vibration conditions is prescribed as follows. 5.6.2.1 The vibration conditions of specimen are classified into the following 4 types according to the category of vehicle mounted with the product. Type 1. car series mainly Type 2. passenger car series mainly Type 3. truck series mainly Type 4. motorcycle series mainly 5.6.2.2 The vibration conditions of specimen are classified into the following 4 types according to the place of product installed on a vehicle. Type A. mounted on vehicle body or the position at the upper side of chassis spring with less vibration Type B. mounted on vehicle body or the position at the upper side of chassis spring with more vibration Type C. mounted on the part of engine with less vibration Type D. mounted on the part of engine with more vibration 5.6.3 Test conditions 5.6.3.1 Test sequence Firstly carry out resonance point determination test and then endurance test. 5.6.3.2 Specimen installation The specimen which is close to use state is mounted on the vibration stand. 5.6.3.3 Vibration application method Simple harmonic vibration in the up-to-down, left-to-right or back-to-forward quadrature direction relative to the installation mode of specimen is applied successively but the harmonic ratio of simple harmonic vibration should be 25% or less of vibration accelerated velocity in principle. 5.6.3.4 Test temperature The test temperature shall be set as standard temperature of 23±5°C in principle. 5.6.4 Test methods 5.6.4.1 Resonance point determination test Table 13 Harm onic Frequency Hz Vibration Acceleration m/s2 Category 1 Category 2 Category 3 Category 4 A B C D A B C D A B C D A B C D 2 33 or 67 22 ○ ○ 3 33 or 67 32 ○ ○ ○ ○ 4 33 or 67 43 ○ ○ ○ ○ ○ 7 33 or 67 67 ○ ○ ○ ○ ○ 9 33, 67or 133 87 ○ ○ ○ ○ 11 67 or 167 111 ○ Table 14 Harmonic Frequency Hz Vibration Acceleration m/s2 Vibration time h Up and down Left and right Front and back 2 33 or 67 22 4 2 2 3 33 or 67 32 4 2 2 4 33 or 67 43 4 2 2 7 33 or 67 67 4 2 2 9 33, 67 or 133 87 4 2 2 11 67 or 167 111 4 2 2 5.7.2 Tests temperature Tests temperature shall, as specified by Table 15, select one temperature in the table to conduct the tests. Table 15 The classification of temperature Tests temperature °C A Standard temperature 23±5 B 0±2 C -40±2 5.7.3 Tests methods 5.7.3.1 Falling-weight impact tests Tests devices. including and supporting mechanism of heavy bobs and specimens, control mechanism for controlling heavy bobs’ free-fall, heavy bobs and staff-gauges. The heavy bob’s head is spherical; its radius is 25 mm; mass is 0.5 kg; it is made of steel material. Tests procedures and operations. there are two methods as the following procedures. One method is the determination of average fracture strength, and th... ......

BASIC DATA
Standard ID QC/T 15-1992 (QC/T15-1992)
Description (Translated English) General test method for automobile plastic products
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard T05
Word Count Estimation 21,259
Date of Issue 1992/5/21
Date of Implementation 1993/6/1
Quoted Standard GB 209; GB 252; GB 435; GB 484; GB 534; GB 2918; GB 5671; JB 3979; QC/T 17; SY 4005
Adopted Standard JASO M312-85, EQV
Drafting Organization Changchun Automobile Research Institute of Materials
Administrative Organization National Automotive Standardization Technical Committee
Regulation (derived from) Reform-Development-Office-Industry (2005) 743
Summary This standard specifies test methods for generic automotive plastic molding products (hereinafter referred to as products) performance? This standard applies to cars with a variety of plastic products, but not for foam products? Cushions? Electroplating products? Coating products?