What are the national standards for automobile synchronizer gear rings?

Industry standard 1 discussion draft of copper alloy tube for automobile synchronizer gear ring. According to the notice of the National Technical Committee for Standardization of Nonferrous Metals, the task of formulating the industrial standard of copper alloy pipe for automobile synchronizer gear ring was drafted by Gaoxin Zhangtong Co., Ltd. and completed in 2007. This standard was first formulated. Our company has conducted market research and product development for more than three years before accepting this standard project. Judging from the current standards at home and abroad, there is no national standard and industry standard for this product in any country, and there is no international standard to follow. Our company collected the enterprise standards of German Volkswagen, Japanese Mitsubishi and American GM through various channels. Through comparative analysis and referring to GB/T 1528 and GB 523 1, we started to write this standard. In the process of compiling this standard, from field test tracking to experimental data collection, we went deep into the production line, collected information extensively and grasped first-hand information. As a manufacturing enterprise, we maintain extensive cooperation with customers, and customers timely feedback our material usage and the latest market trends, thus making the formulation of standards more reasonable, scientific and operable. It also makes the quality of our products stable and reliable, and meets the market demand. Two. Compilation principle: From June, 5438 to October, 2006/KLOC-0, Gaoxin Zhangtong Co., Ltd. received the task of formulating the industrial standard of "Copper Alloy Tube for Gear Ring of Automobile Synchronizer", and immediately set up a standard-setting working committee, worked out the work plan and schedule in a short time, and began to collect relevant information. In June, 2006, the investigation letter of "Formulating the Industry Standard of Copper Alloy Tube for Automobile Synchronizer Gear Ring" was drafted, and letters were sent to nine major domestic copper processing and using units, including Shanghai Haixin Shenjiang Copper Processing Factory, Luoyang Copper Processing Factory, Shanghai Volkswagen Gear No.4 Factory, Wuxi Dai 'ao, Kunshan Zheng Da Precision Forging Co., Ltd., Sichuan Changjiang Machinery Co., Ltd. and Wuhan Panzhou Machinery Co., Ltd. for investigation. Three. Setting Background Because there is no uniform industry standard for copper alloy pipe used for automobile synchronizer gear ring in China, major automobile parts manufacturers have been making requirements for suppliers with the standards formulated by the automobile industry. Because there are many brands of copper alloy tubes used in automobile synchronizer gear ring, and enterprises have different requirements on machining accuracy, performance and organization, it brings a lot of unnecessary troubles to both supply and demand sides. In order to make the copper alloy tube for automobile synchronizer gear ring develop in the correct, reasonable and standardized direction, the industry standard of copper alloy tube for automobile synchronizer gear ring is formulated. Iv. formulation principles: 1. It is conducive to promoting fair competition and protecting the legitimate rights and interests of both supply and demand sides. 2. It is conducive to promoting the localization of parts in the automobile industry and improving the economic and social benefits of the whole industry. 3. Adhere to strong operability in production. V. Determination of main technical contents: 1. Determination of chemical composition of products Because most of the mainstream models of domestic automobile manufacturing enterprises are imported from abroad, their spare parts directly adopt the standards of foreign automobile enterprises. Therefore, when determining the chemical composition of products, we mainly refer to the enterprise standards of several famous foreign automobile manufacturers, such as Volkswagen, Mitsubishi of Japan and GM of the United States. The detection of chemical composition of products is mainly based on the analysis before and after the furnace. Direct reading spectrometer is generally used for rapid composition detection before furnace analysis, and copper ingots are cast after the composition control requirements are met. After furnace analysis, direct reading spectrometer analysis and chemical analysis are generally used to verify at the same time. Domestic brand number Foreign counterpart brand number Japan Mitsubishi German Volkswagen American GM HMN59-2-1TL-VW 081HAL614-3-1C4083SHMN66-8-6TL-VW 084HMN62-3-3. HMn58-2-2 C4080S2。 Requirements for the phase composition and proportion of materials when determining the product structure state: According to the standards of several foreign automobile enterprises, detailed requirements are made for the metallographic structure of materials without exception, such as grain size, phase composition, material proportion, etc. Taking HAl6 1-4-3- 1 as an example, it is required that the α phase in the material should not exceed 30%, and the strengthening phase must be spheroidized. As we all know, the adjustment of the ratio of α phase and β phase can directly affect the hardness of materials, and the shape and distribution of strengthening phases have a great influence on the wear resistance of materials. Therefore, combined with the opinions of automobile manufacturers, we added the phase composition of material organization to the standard formulation this time. The inspection method of each phase composition of the material shall conform to the provisions of YS/T 449, and the inspection of grain size shall conform to the provisions of YS/T 347. 3. Determination of mechanical properties of products When determining the material performance indexes such as tensile strength, yield strength, Brinell hardness, Rockwell hardness and elongation, because the standards of domestic gear ring parts manufacturers refer to the standards of foreign auto parts enterprises, their requirements for mechanical properties of gear ring materials are basically the same as those of foreign standards, we refer to the enterprise standards of foreign enterprises such as Mitsubishi of Japan, GM of the United States and Volkswagen of Germany. Metal tensile test method refers to GB/T 228；; ; Refer to GB/T 230.1for the test method of metal Rockwell hardness; See GB/T 23 1. 1 for the test method of brinell hardness of metals. 4. Determination of product specifications and surface quality Due to the particularity of the automobile industry, basically the specifications and shapes of the gear rings used by different models of each automobile manufacturer are different. Often the same brand has many specifications. Therefore, it has brought great trouble to the gear ring material production enterprises. According to the demand of domestic gear ring market, we have formulated a set of recommended specifications and sizes. We want to serialize and generalize the product specifications through standardization, meet the maximum demand of the market with the least variety specifications, and guide the market through standards, which can reduce the cost of tools and molds, reduce production costs and facilitate management. Refer to GB/T 1528 for the determination of product surface quality. Technical and economic demonstration of intransitive verbs Our company's gear ring project has a total investment of 49.09 million yuan, with an annual output of 1 10,000 tons of complex brass tubes and an average annual sales income of 65 million yuan. The average annual total cost is 56 million yuan and the average annual after-tax profit is 5.04 million yuan. The internal rate of return of the total investment is 35.46%, the payback period of the investment is 2.29 years, and the loan repayment period is 65,438+0.94 years (including the capital construction period of 0.5 years). This project attempts to establish a national production line of complex copper pipe system with high strength and wear resistance. A brand HAL6 1-4-3- 1Re has passed the appraisal organized by the Provincial Science and Technology Department, and its patent application number is 03 13786.3, which belongs to our company's independent intellectual property rights. Now it has been supplied in batches, and has established a close cooperative relationship with Shanghai Automobile Gear No.4 Factory. From the economic analysis, the economic benefit of this project is good. However, after production, there may be some market and price impacts. Therefore, enterprises must strengthen management, master production technology skillfully, improve product quality, reduce costs and make products more competitive. Due to the rapid development of China's automobile industry, the demand for copper alloy pipes and high-performance and high-precision synchronizer gear ring products has increased rapidly, and the annual demand for copper tubes for synchronizer gear ring of the whole vehicle has reached 8000 tons. However, due to the backward production technology and equipment level of automobile gear ring materials in China, there are some problems in production, such as low efficiency, low yield, high cost and unstable product performance, which can not meet the needs of the rapid development of China's automobile industry, especially the automobile synchronizer gear ring materials with high performance requirements rely heavily on imports. Hi-Tech Zhang Tong Co., Ltd. has accumulated a lot of experience in automobile synchronizer gear ring through the research of this project, from small batch supply to the completion and large-scale production of the industrial equipment line of the project, and has also been recognized by the industry. However, before the national standards and industry standards were not formulated, the standardization of the market became inevitable. There must be recommended national standards to regulate the production of this industry and make it more formal. Seven, this standard is formulated for the first time, and is now recommended as a recommended industry standard.