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Manufacturer of High-Precision Electric Cylinders

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Do you know these simple mechanical knowledge？Aug 15, 2024

Q:What is the purpose of tightening in a threaded connection? Several methods of controlling the tightening force are given.

A: The purpose of tightening in the threaded connection is to make the bolt produce pre-tightening force, and the purpose of pre-tightening is to enhance the reliability and tightness of the connection to prevent gaps or relative sliding between the connected parts after loading. The effective way to control the tightening force is to measure the torque wrench or fixed torque wrench. When the required torque is reached, it can be locked; Or the method of measuring bolt elongation can be used to control the preload.

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Q:Why is the allowable contact stress of gray cast iron and aluminum bronze turbines related to the sliding speed of the tooth surfaces?
A: Because the main failure form of gray cast iron and aluminum-iron bronze turbines is tooth surface gluing, and the gluing is related to the sliding speed, so the allowable contact stress is related to the sliding speed of the teeth. The main failure form of cast tin bronze turbine is pitting of tooth surface, which is caused by the contact stress, so the allowable contact stress has nothing to do with the sliding speed.


Q:What are the methods of circumferential fixing of the parts on the shaft?
A:Circumferential fixation: key connection, spline connection, interference fit connection, set screw, pin connection, expansion connection.


Q:What are the two strength calculation theories in gear strength calculation? For which failures? If the gear drive is a closed soft-tooth surface drive, what are the design criteria?
A: The contact fatigue strength of the tooth surface and the bending fatigue strength of the tooth root are calculated. The contact fatigue strength of the tooth surface is for the fatigue pitting failure of the tooth surface and the bending fatigue strength of the tooth root is for the fatigue fracture of the tooth root. The gear drive is a closed soft tooth surface drive. Its design criterion is to design according to the contact fatigue strength of the tooth surface and check the bending fatigue strength of the tooth root.


Q:What are the functions of couplings and clutches? What's the difference?
A: The function of the coupling and clutch is to connect two axes so that one of them rotates together and transmits torque. The difference between the two is that the two shafts connected with the coupling can not be separated in the work, and the two shafts can be separated only after the disassembly of the parts after the shutdown, and the clutch can be separated or engaged at any time during the operation of the machine.

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