Shaft Titanium shaft Gr12 ASTM B348 Titanium Forging

A shaft is a cylindrical object worn between bearings or wheels or gears, but a few are square. A shaft is a mechanical part that supports and rotates with a rotating part to transmit motion, torque, or bending moment. They are generally shaped like metal rods and may have different diameters. The rotating parts of the machine are attached to the shaft.

The structural design of the shaft is an important step to determine the reasonable shape and all the structural dimensions of the shaft. It is installed on the shaft parts type, size and its position, the fixed way of the parts, the nature of the load, direction, size and distribution, bearing type and size, the shaft of the blank, manufacturing and assembly process, installation and transportation, deformation of the shaft and other factors. Designers can design according to the specific requirements of the shaft, if necessary, several schemes can be compared in order to select the design scheme, the following is the general shaft structure design principles:

1, save material, reduce weight, try to use the same strength size or large section coefficient of the section shape;

2. Easy to accurately position, stabilize, assemble, disassemble and adjust the parts on the shaft;

3, adopt various structural measures to reduce stress concentration and improve strength;

4, easy to process and manufacture and ensure accuracy.

Common shaft according to the structure of the shaft shape can be divided into crankshaft, straight shaft, soft shaft, solid shaft, hollow shaft, rigid shaft, flexible shaft (soft shaft). The straight axis can be divided into:

① The shaft, working under both bending moment and torque, is the most common shaft in machinery, such as a variety of reducer shaft, etc.

② Mandrel, used to support rotating parts only bear bending moment and not transfer torque, some mandrel rotation, such as the shaft of railway vehicles, some mandrel does not rotate, such as the shaft of supporting pulley, etc.

③ The drive shaft is mainly used to transfer torque without bearing bending moment, such as the long optical shaft in the crane moving mechanism, the drive shaft of the car, etc. The material of the shaft is mainly carbon steel or alloy steel, or ductile iron or alloy cast iron. The working capacity of the shaft generally depends on the strength and stiffness, but also depends on the vibration stability at high speed.

Shaft wear is the most common equipment problem in the process of shaft use. Axial appeared because there are a lot of wear and tear, but the main reason is the nature of metal used to manufacture shaft, metal while high hardness, poor but concessions cannot recover after (deformation), shock resistance is poorer, anti-fatigue performance is poor, so easy to cause adhesion wear, abrasive wear, fatigue wear and fretting wear, most of the axial wear subtle, Only when the machine is high temperature, jump amplitude, abnormal sound and other circumstances, will cause people's awareness, but when people find that most of the shaft has been worn, resulting in machine shutdown.