The shaft is a cylindrical object that goes through the middle of the bearing or the middle of the wheel or the middle of the gear, but a small part is also square. A shaft is a mechanical part that supports and revolves with a rotating part to transmit motion, torque or bending moment. Generally, it is in the shape of a metal round rod, and each segment can have different diameters. The parts that make rotary motion in the machine are mounted on the shaft.
According to the shape of the shaft, the shaft can be divided into two types: crankshaft and straight shaft.According to the loading of the shaft, it can be divided into: rotating shaft, mandrel, and transmission shaft. Shaft parts 4 Axis Machining parts, 5 Axis Machining Parts are processed by Evonik, and the quality is guaranteed. The structural design of the shaft is an important step in determining the reasonable shape and overall structural dimensions of the shaft. It consists of the type, size and position of the parts installed on the shaft, the fixing method of the parts, the nature, direction, size and distribution of the load, the type and size of the bearing, the blank of the shaft, the manufacturing and assembly process, installation and transportation, and the shaft. deformation and other factors. The designer can design according to the specific requirements of the shaft, and compare several schemes if necessary, so as to select the best design scheme.
Shaft material and selection 1. The shaft material is mainly carbon steel and alloy steel. The commonly used carbon steel is 45 steel, which should generally be normalized or quenched and tempered to improve its mechanical properties. Alloy steel has higher mechanical properties and heat treatment properties than carbon steel, but it is more sensitive to stress concentration and more expensive, so it is mostly used in occasions with high speed, heavy load and special conditions such as wear resistance, high temperature resistance or low temperature. . Since the elastic modulus difference between alloy steel and carbon steel is very small at room temperature, replacing carbon steel with alloy steel cannot significantly improve the stiffness of the shaft. 2. Alloy steel can be used for shafts that bear large loads, require high strength, compact structure or have good wear resistance. Commonly used are 40Cr, 20Cr, 35SiMn and so on. It should be pointed out that when the dimensions are the same, the use of alloy steel cannot improve the stiffness of the shaft, because in general, the elastic modulus of various steels is similar; alloy steel is more sensitive to stress concentration, so the structural design of the shaft is more important. Pay attention to reducing the influence of stress concentration; when using alloy steel, corresponding heat treatment must be carried out in order to better exert the performance of the material. 3. The blank of the shaft is generally hot-rolled round steel or forging. For shafts with complex shapes (such as crankshafts and camshafts, etc.), cast steel or ductile iron can also be used. The latter has the advantages of good vibration absorption, low sensitivity to stress concentration and low price. Our processing also includes Aluminum Block, Cnc Milling Machining Parts, Aluminum Cnc Machining Parts, the company has strong strength, respects credit, abides by contracts, and guarantees product quality. It has won the trust of customers with its multi-variety operating characteristics and the principle of small profits but quick turnover.
