Insufficient quality of basic parts and components

According to the results of the third quarter of product quality supervision and inspection released by the General Administration of Quality Supervision, Inspection and Quarantine, the quality of basic parts and spare parts products is uneven, and the overall sampling qualification rate is 70%.
In the third quarter, the quality inspection department sampled a total of 20 types of basic parts and components such as rolling bearings, chains, medium involute spur gears, industrial thermocouples, and automotive brake hoses, and the sampling pass rate was 70%. The results of random inspections indicate that enterprises with large-scale production have a high technological content and good quality. Rolling bearings, hydraulic quantitative vane pumps, medium-modulus involute cylindrical gears, thermistors and other products produced by some companies are close to the international advanced level of similar products, replacing imported products, and some products have entered the international market. However, the quality of small-scale enterprises with a large number of products and relatively low market share is relatively high. Overall, there is a pattern of inconsistencies and differences.
Spot checks found that the quality problems reflected by the basic parts and parts products mainly have two aspects: First, due to the low level of technology, the processing accuracy is not high, resulting in low product quality and poor quality. For example, in the sampling of diesel engine outlet valves, there are 24 types of products that are too poor in the accuracy of the main parts of the outlet valve. The processing accuracy of the important parts of the oil valve is too bad, which will affect the uniformity of the work of the multi-cylinder diesel engine, leading to excessive diesel engine power and emission indicators. According to survey statistics, due to the high precision of parts processing in foreign developed countries' products, the assembly of the parts can be completed at the end of the assembly process. However, due to the low processing accuracy of most enterprises in China, the production of the couples must be reprocessed to meet the requirements after the mating ends. Product seat sealing requirements.
Second, due to the poor quality of raw materials used, the reliability of the basic parts and spare parts products is not high. The motorcycle tires that were spot checked were required to change the load and run for 34 hours according to the standard. There should be no breakage in the durability test of the five products. For example, Shuangwang Brand 2.50 produced by Shuangwang Rubber Co., Ltd. of Dongying City, Shandong Province. -17-type motorcycle tires, due to poor quality of raw materials, only 12.5 hours that is damaged; spot checks of AC motor capacitor products, 10 kinds of product durability test failed, such as Shunde City Bijiang Huabao capacitor factory CHB brand capacitors, Due to the poor quality of the membranes used to make the capacitors, after the endurance test was conducted, the housing was severely deformed, the capacity was almost zero, and the capacitors were shorted.