The guided pin controls the motion trajectory of the mechanical device through geometric constraints and mechanical guidance. Its structural design includes a precision cylinder and a positioning cone. The guided pin is made of surface-hardened tungsten carbide alloy with a high Rockwell hardness and can withstand 2000N-level lateral loads.
The core function of the guided pin is reflected in the kinematic constraint mechanism. The double guide pin system forms an over-positioning structure to eliminate the three rotational degrees of freedom in the plane motion. The chamfer design reduces the initial assembly contact stress, and the gradient diameter structure produces a hydraulic damping effect at the end of the stroke, which can buffer the impact load of the speed. The difference between the thermal expansion coefficient and the base material can effectively avoid the failure of the fit caused by the increase in temperature.
The dynamic accuracy of the guided pin is maintained by the surface diamond-like coating, and the wear rate is low during the working operation. The closed lubrication groove stores molybdenum disulfide grease, which keeps the lubricating film intact in 2 million cycle tests. Failure warning is monitored by an acoustic emission sensor. When the vibration spectrum increases by 15dB in the 5-8kHz frequency band, it indicates the initiation of microcracks in the pin shaft. These engineering elements ensure that the guide pins can achieve micron-level repeatable positioning accuracy in high-speed precision equipment.
