Coordinate measuring machines (CMMs) are sophisticated measuring instruments used in industries where precise measurements are required, such as aerospace, automotive, and medical device manufacturing. These machines use granite components due to their high stiffness, excellent thermal stability, and low coefficient of thermal expansion, making them ideal for high-precision measuring applications. However, granite components are also prone to vibration and shock, which can degrade measurement accuracy. That's why CMM manufacturers take measures to isolate and absorb vibrations and shocks on their granite components.
One of the primary measures for vibration isolation and shock absorption is the use of a high-quality granite material. This material is selected for its high stiffness, which helps to reduce any movement caused by external forces and vibrations. The granite is also highly resistant to thermal expansion, which means that it maintains its shape even in the presence of temperature fluctuations. This thermal stability ensures that the measurements remain accurate, even under varying environmental conditions.
Another measure used to enhance the stability of granite components is to place shock-absorbing materials between the granite structure and the rest of the machine. For example, some CMMs have a specialized plate called a damping plate, which is attached to the granite structure of the machine. This plate is designed to absorb any vibrations that may be transmitted through the granite structure. The damping plate contains various materials, such as rubber or other polymers, which absorb the vibration frequencies and reduce their impact on the measurement accuracy.
Furthermore, precision air bearings are another measure used for vibration isolation and shock absorption. The CMM machine rests on a series of air bearings that utilize compressed air to float the granite guide rail above a cushion of air. The air bearings provide a smooth and stable surface for the machine to move, with minimal friction and wear. These bearings also act as a shock absorber, absorbing any unwanted vibrations and preventing them from transferring to the granite structure. By reducing wear and minimizing the external forces acting on the machine, the use of precision air bearings ensures that the CMM maintains its measurement accuracy over time.
In conclusion, the use of granite components in CMM machines is critical for achieving high-precision measurements. While these components are susceptible to vibration and shock, the measures implemented by CMM manufacturers minimize their effects. These measures include selecting high-quality granite material, installing shock-absorbing materials, and using precision air bearings. By implementing these vibration isolation and shock absorption measures, CMM manufacturers can ensure that their machines deliver reliable and accurate measurements every time.
Post time: Apr-11-2024