Main Compilation Principles (1) Threaded fasteners at the engine interface must be in English to ensure interchange of Chinese and foreign models. Threaded fasteners in other parts are converted to metric. (2) According to the standards and technical data provided by the British side, under the premise of not lowering the requirements of the British standard and ensuring the quality level of the products, the current domestic standards shall be adopted as far as possible and shall be prepared in accordance with the provisions of GB/T1.1. (3) For the technical content without domestic standards, when the standards are prepared, the technical level requirements are high, that is, the principle of “high or lowâ€. According to the actual needs of the production and acceptance of an engine main engine and auxiliary machinery factory, the project is determined to prepare the following joint enterprise standards. In the preparation of the joint enterprise standard, all the related parts and models were analyzed and compared, and the corresponding technical requirements and parts were summarized, and the specifications and materials were tried to be as uniform as possible. Under the premise of requirements and quality, the same kind of materials can be used, and the principle is as uniform as possible. Uniform general tolerance requirements are applied to all fasteners, and special requirements are adopted and executed according to HB5800; for the condition that the silver plating layer is not uniform, the method of sub-standard treatment is adopted; for the acceptance rule, the imperial and metric bolts and nuts are uniformly prepared. , general technical conditions of the screw sleeve, etc. In short, the content of the enterprise standards that we strive to compile is coordinated, rigorous, and scientific, and can ensure product quality. In the process of joint enterprise standardization, the following technical problems are solved: (1) Silver plating layer problem: According to comparative analysis and performance considerations, the thickness of silver plating is divided into two types according to different thread specifications, that is, the thread size is less than or equal to 0.164 inches. (4.166mm) thread, silver plated layer thickness (3 ~ 5) μm; thread size greater than 0.164 inch thread, silver plated layer thickness (5 ~ 8) μm. (2) Dimensions, dimensional tolerances, and geometric tolerances: The requirements for tolerances in the original product drawings are inconsistent. Some requirements are in accordance with US standards. Some requirements are based on the technical conditions of the British company. The standard preparation group compares and analyzes national standards. The industry standards and relevant documents of the British side adopt the principle of “high or low†to ensure product quality. Conclusion After 22 years of use of threaded fasteners and wire thread inserts, our company has analyzed and studied the problems existing in the company. Finally, it has been revised and improved to be practical and applicable to the screw fastening of an engine. The joint enterprise standard lasted for nearly seven years. Solar Green House,Solar Greenhouse Construction,Small Solar Greenhouse,Passive Solar Greenhouse Jilin Yidao Technology Co., Ltd , https://www.changchunoptics.com
Brief analysis of the development of a new type of fastener calibration for a starter