The thread part of the screw is one of its core parts, and its main function is to transmit rotary motion and torque. The thread shape and parameters of the screw have an important influence on its performance and service life. Commonly used screw threads can be divided into triangular thread, trapezoidal thread, rectangular thread, serrated thread and ball thread.
1. Triangular teeth: divided into coarse teeth and fine teeth. The angle of view of triangular teeth is 60, and the tooth type looks like a triangle with a pointed top. Generally, those that are not marked are considered coarse teeth, and those with special needs for fine teeth generally need to indicate the pitch. The commonly used screws are triangular teeth, which are easy to process and make.
2. Trapezoidal tooth: the tooth shape is like an isosceles trapezoid, with narrow upper part and wide lower part. The trapezoidal tooth is relatively simple to process. The tightness of nut and screw can be adjusted according to the depth of the tooth, which is mainly used for driving threads. The inner and outer threads are closely attached to the conical surface and are not easy to loosen. The technology is good, the root strength is high, and the neutrality is good. It is mainly used for driving threads.
3. Rectangular tooth: it is also marked by outer diameter and pitch. It is difficult to make rectangular thread accurately, and it is difficult to compensate or correct the worn open space of screw pair, which is mainly used in force transmission organizations.
4. Sawtooth tooth: the tooth shape is a bit like a sawtooth, and it is an isosceles trapezoid. The flank angle of the working surface is 3 degrees, and the flank angle of the non-working surface is 30 degrees. The root of the external thread has a large fillet to reduce the stress concentration. After the external and internal threads are screwed, the large diameter is easy to center without clearing, which has the characteristics of high rectangular transmission power and high strength of the root of the trapezoidal thread. It is used for transmission threads under unidirectional stress.
5. Ball thread: it is a circular groove, and the ball is rolled between the screw and the nut for transmission. The empty space between the screw and the nut can be eliminated by replacing the ball, so the transmission efficiency is high, the precision is high, and the mute function is good. It has been widely used in various automation equipment, machine tools, etc.
To sum up, the thread part of the screw has an important influence on its performance and service life. When selecting and using the screw, it is necessary to select the appropriate thread shape, parameters and materials according to the actual needs and application scenarios to ensure the stability and reliability of mechanical equipment. Please contact us if you have other questions or purchase requirements.
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