As a precision machining equipment, the smooth operation of the worktable directly determines the machining accuracy and efficiency of high-speed engraving and milling machines. Crawling faults, as a common problem, manifest as periodic pauses or jumps during low-speed operation of the workbench, which not only affects the surface quality of the workpiece but may also exacerbate mechanical wear. Solving this fault requires starting from the mechanism, accurately identifying the cause, and taking targeted measures.

Lubrication system failure is the primary factor causing crawling. A stable oil film needs to be formed between the guide rail and slider of the high-speed engraving and milling machine worktable. If the viscosity of the lubricating oil is not consistent, the oil volume is insufficient, or the oil circuit is blocked, the oil film is prone to rupture, causing direct contact between the metal and resulting in sudden changes in the dynamic and static friction coefficients, which can then cause crawling. When solving the problem, it is necessary to first check the lubricating oil model to ensure that it meets the requirements of the equipment manual. Usually, a specialized guide rail oil with moderate viscosity is selected; Next, check if the oil circuit is unobstructed, clean the filter screen and impurities in the oil pipe, and replace the aging sealing ring if necessary; Finally, establish a regular lubrication system and set the refueling cycle according to the operating time to ensure the continuous stability of the oil film.

Mechanical structural abnormalities are another core cause. Wear, scratches, or insufficient installation accuracy on the guide rail surface can cause uneven resistance during the operation of the workbench; Wear of the screw nut pair, excessive clearance, or insufficient pre tightening force can also cause transmission impact, resulting in crawling. When processing, it is necessary to first check the accuracy of the guide rail, repair the worn surface by scraping or grinding, and recalibrate the installation accuracy; Check the screw nut pair again, and adjust the preload after replacing the worn parts to ensure smooth transmission. In addition, it is necessary to regularly clean the chips and impurities on the guide rail surface to avoid hard wear.

Improper setting of control system parameters may also lead to crawling. The mismatch between parameters such as servo motor gain and acceleration/deceleration time and load can cause fluctuations in motor output torque, leading to unstable operation of the worktable. When solving the problem, it is necessary to combine the processing conditions and adjust the parameters through the equipment control system: increase the gain value during low-speed operation, reduce the acceleration and deceleration time constant, and adapt the motor torque output to the worktable load. At the same time, check the servo motor encoder signal to ensure accurate position feedback.

In summary, to solve the crawling fault of the high-speed engraving and milling machine worktable, the principle of "lubrication priority, structural investigation, parameter matching" should be followed, and targeted measures should be taken by systematically checking and locating the causes. Establishing a regular maintenance system in daily operation and maintenance can reduce the occurrence rate of failures from the source and ensure the precision machining capability of equipment.