How to measure O-rings?

O-ring O-ring is a rubber sealing ring with a circular cross-section. Because its cross-section is O-shaped, it is called an O-ring, also called an O-ring.


In machine tools, ships, automobiles, aerospace equipment, O-rings are suitable for installation on various mechanical equipment, and they can be sealed under static or moving conditions at a specified temperature, pressure, and different liquid and gas media. effect. , Metallurgical machinery, chemical machinery, construction machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various types of instruments, a large number of various types of sealing elements are used. O-rings are mainly used for static seals and rotary motion seals. When used for rotary motion seals, it is limited to low-speed rotary seals. The O-ring is generally installed in a groove with a rectangular cross section on the outer or inner circle to play a sealing role. O-rings are resistant to oil and acids. Therefore, O-rings are the most widely used seals in hydraulic and pneumatic transmission systems.


Because the O-ring is a flexible material, the measurement force will cause it to cause deformation that cannot be ignored. This kind of measurement, therefore, for the quality inspection of rubber O-rings, most factories use calipers to measure the internal, dimensions and cross-sections, and the measurement error penetrates. The method cannot meet the precision requirements of mechanical seal accessories. The quality control of finished O-shaped rubber parts is very ideal abroad. Generally, the hardness of the finished product is tested by using a micro hardness tester. The finished O-ring is used to directly measure the tensile, medium aging resistance, deformation and relaxation properties, and comprehensively control the production process and O-ring material The geometric dimension measurement is carried out by an automatic measuring instrument with electronic computer control or "screen dialogue".