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There are clear standards for mechanical parts and components, including Chinese National Standards (GB), American Institute of Mechanical Engineers (ANSI/ASME), and other Japanese (JIS), German (DIN), and other standards widely used around the world. Mechanical components and parts with high standardization and strong industry universality are also known as universal parts. Generalized standard components include fasteners, connectors, transmission components, seals, hydraulic components, pneumatic components, bearings, springs, etc., all of which have corresponding national standards and strong cross industry universality.   Industry standard parts are a commonly accepted term within the industry and are not explicitly defined. Common industry standard parts include mold standard parts, automotive standard parts, etc. When a product is widely used in the industry, it is a universal component; General component standards are usually formulated by industry leaders and widely accepted within the industry, making enterprise standards the de facto industry standards, which can be referred to as industry standard components.

Special knowledge for automotive fasteners. Today, Aobiao will teach you some small knowledge about the surface and inspection methods of screw fasteners. As the saying goes, experts look at the tricks, outsiders look at the excitement. So let's also have an expert look at the excitement!   Surface treatment and inspection of fasteners. Surface treatment refers to the process of forming a covering layer on the surface of fasteners through certain methods. After surface treatment, fasteners can present a more beautiful appearance and improve their corrosion resistance. There are several methods for surface treatment of fasteners:   Mechanical plating of fasteners refers to the use of specific physical and chemical methods to impact the surface of fasteners with coated metal powder, so that the coated metal forms a coating on the surface of fasteners through cold welding, achieving surface treatment effect. Mechanical plating of fasteners is mainly applicable to spare parts such as screws, nuts, and washers.   Hot dip galvanizing of fasteners is the process of immersing carbon steel fasteners into a molten zinc plating bath at a temperature of approximately 510 ℃. This transforms the iron zinc alloy on the surface of the fasteners into passivated zinc, resulting in a surface treatment effect. The price of hot-dip galvanizing for fasteners is higher than electroplating, about 1.5 to 2 yuan per kilogram.   Electroplating of fasteners refers to immersing the part of the fastener that needs to be electroplated into a specific aqueous solution, which contains some deposited metal compounds. After passing current through the aqueous solution, the metal substances in the solution precipitate and adhere to the immersed part of the fastener. The electroplating of fasteners generally includes galvanizing, copper, nickel, chromium, copper nickel alloys, etc.   The main purpose of surface treatment of fasteners is to enhance their corrosion resistance, thereby increasing the reliability and adaptability of fastener use. Therefore, the quality assessment of fastener surface treatment is mainly to check whether the corrosion resistance of fasteners has been effectively increased and whether the increase meets the expected requirements.   Appearance quality requirements: The inspection of the appearance of stainless steel screws is carried out from various aspects such as appearance, plating layer, etc.   Inspection of Coating Thickness on Screws   1. Measuring method: The amount used includes micrometers, vernier calipers, plug gauges, etc.   2. Magnetic method: The magnetic method is used to measure the thickness of a coating layer, which is a non-destructive measurement of a non-magnetic coating layer on a magnetic substrate using a magnetic thickness gauge.   3. Microscopy method: Microscopy method, also known as metallographic method, involves magnifying etched fasteners on a metallographic microscope with a micrometer eyepiece to measure the thickness of the coating on the cross-section.   4. Timed flow method   The timed flow method is to pour a solution that can dissolve the coating onto the local surface of the coating, and calculate the thickness of the coating based on the time required for the local coating to dissolve completely. There are also plating drop method, anodic dissolution Coulomb method, etc.   There are many methods for testing the adhesion strength of screw coatings and evaluating the adhesion between coatings and base metals, usually including the following.   1. Friction polishing test;   2. Filing method test;   3. Scratch method;   4. Bending test;   5. Thermal shock test;   6. Squeezing method.  

Zhejiang Aobiao Vehicle Parts Co., Ltd. requires document specification support to guide every aspect of production and management in every production process. Undoubtedly, seemingly simple specification guidance documents play an immeasurable role in the development of automotive fastener manufacturers. Whether it is daily management or long-term development planning, they are essential. No wonder all automotive fastener manufacturers have similar departments or positions, such as document control department, document management specialist, etc., which to some extent demonstrate their importance. Large enterprises, such as traditional enterprises like automotive fasteners, need this to some extent. Let's take a look at a small document from Zhejiang Aobiao Vehicle Parts Co., Ltd.:   Production equipment, facilities, and management processes   1： Purpose   Effectively manage production equipment/facilities to ensure normal production and product quality meets requirements, and improve the utilization rate of equipment/facilities.   2： Scope   Applicable to the management of the entire process of purchasing, manufacturing, using, maintaining, and scrapping production equipment/facilities in our factory.   3： Workflow   A. Equipment Procurement Application and Production IV: Process Description   The production department submits a new equipment procurement application, which is approved by the manager. The production equipment is then procured by the procurement department.   B. Equipment/facility acceptance management   a) Before unboxing the production equipment, the marketing department organizes the production department equipment administrator, technical department, and production workshop to go to the site to count the random technical data and equipment accessories according to the packing list. The equipment accessories shall be kept by the workshop using them, and the original documents shall be archived in the data room. The management and use departments of the equipment shall use photocopies.   b) The production department organizes the technical department, marketing department, user workshop, and supplier debugging personnel to conduct acceptance of the specified technical parameters.   c) Conduct trial production acceptance of the equipment using the corresponding products.   d) After passing the acceptance inspection, the technical department, production department, and user workshop shall sign and confirm on the [Equipment/Facility Acceptance Form] as a handover procedure.   e) Unqualified equipment/facilities will be negotiated between the procurement department and the supplier.   Daily management of C production equipment/facilities   a) Number, registration, and filing of production equipment.   b) The equipment administrator of the production department shall uniformly number the production equipment/facilities according to the equipment/facility numbering method.   c) The equipment administrator of the production department is responsible for preparing the [Equipment/Facility Ledger Registration Form] for the entire factory   Daily use management of production equipment/facilities   a) The office provides training to operators in accordance with the "Production Equipment Operation Regulations".   b) Operators shall operate according to the "Production Equipment Operation Regulations" to ensure the safety of equipment/facilities and personnel.   Daily maintenance of E production equipment/facilities   a) The equipment administrator shall follow the instructions and actual usage of the equipment, and transmit them to the machine warehouse to ensure sufficient spare parts.