Machinery has a variety of different operating conditions, in order to meet these specific use requirements, different types of bearings are required to ensure the actual needs. According to the shape of the rolling element, the rolling bearing can be roughly divided into a ball bearing and a roller bearing; according to the main direction of the load, it can be divided into a radial bearing and a thrust bearing. 1. Selection of rolling bearing type There are various types of rolling bearing. When selecting, consider the following factors to choose. a. The size, direction and nature of the load: ball bearings are suitable for light loads and roller bearings are suitable for heavy and impact loads. When the rolling bearing is subjected to pure axial load, thrust bearing is generally used; when the rolling bearing is subjected to pure radial load, deep groove ball bearing or short cylindrical roller bearing is generally used; when the rolling bearing is subjected to pure radial load, there is still little For axial load, deep groove ball bearings, angular contact ball bearings, tapered roller bearings and self-aligning balls or spherical roller bearings are available. When the axial load is large, angular contact with large contact angle can be selected. Ball bearings and tapered roller bearings, or the combination of radial and thrust bearings, are particularly suitable for very high axial loads or especially for large axial stiffness. b. Allowable speed: There are large differences depending on the type of bearing. In general, bearings with low friction and low heat generation are suitable for high speeds. The design is designed to work with rolling bearings below their limit speed. c. Rigidity: When the bearing is under load, the bearing ring and the rolling element will be elastically deformed at the contact point. The deformation is proportional to the load, and the ratio determines the rigidity of the bearing. Generally, the rigidity of the bearing can be improved by pre-tightening of the bearing; in addition, in the design of the bearing support, the bearing rigidity can be improved by considering the combination and arrangement of the bearings. d. Self-aligning performance and installation error: After the bearing is loaded into the working position, it is often poorly installed and positioned due to manufacturing errors. At this time, the bearing often suffers from excessive load due to the degree of fishing and thermal expansion of the shaft, causing early damage. Self-aligning bearings can overcome the defects caused by installation errors and are suitable for such applications. e. Installation and disassembly: Tapered roller bearings, needle bearings and tapered roller bearings, etc., belong to the type of bearings that can be separated inside and outside the ring (so-called separate bearings), easy to install and disassemble. f. Marketability: Even if it is a bearing listed in the catalogue, there is no market for sales; on the contrary, some bearings that are not included in the catalogue are produced in large quantities. Therefore, it should be clear whether the bearings used are readily available. 2, rolling bearing code rolling bearing code is a letter plus number to indicate the bearing structure, size, tolerance level, technical performance and other characteristics of the product symbol. The national standard GB/T272-93 stipulates that the bearing code is composed of three parts: The predecessor code basic code post code code base code is the basis of the bearing code. The pre-code and post-code are all supplements to the bearing code. They are only used when there are special requirements for the bearing structure, shape, material, tolerance class, technical requirements, etc. The general situation may be partially or completely omitted. a. The basic code base code indicates the basic type, structure and size of the bearing. It consists of bearing type code, size series code, and inner diameter code. Type code size series code ID code a1, bearing type code numbers or letters indicate different types of bearings, see the database for details. A2, size series code consists of two digits. The first digit represents the width series (radial bearing) or the height series (thrust bearing), and the last digit represents the diameter series. The dimension series means that bearings of the same inner diameter can have different outer diameters, while the same outer diameters have different widths (or heights), thereby being used to meet the bearing capacity of various requirements. A3, the inner diameter code indicates the nominal inner diameter of the bearing, which is represented by a number. Example: bearing 2 32 24 2-type code, spherical roller bearing; 32-size series code; 24--inner code, d=120mm; Example: bearing 6208-2Z/P6 6-type code, deep groove ball bearing; 2-size series code; 08-inner diameter code, d=40mm; 2Z-bearings with dust cover on both ends; P6-tolerance class meets standard 6
Metal hardware parts are a crucial component in the manufacturing industry, with a wide variety of applications. These hardware parts are typically cast, machined, or stamped from a variety of metal materials including steel, aluminum, brass, and zinc. Metal hardware parts are widely used in various industries such as automotive, aviation, construction, and electronics.
One of the most common metal hardware parts is the metal fastener. Metal fasteners, including bolts, screws, nuts, and washers, play a crucial role in joining two or more metal parts together securely. They are typically made of steel or aluminum and come in a variety of sizes and shapes to suit various applications.
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