A temperature rise test method for CNC lathe spindle

Abstract

The invention discloses a method for testing the temperature rise of the main shaft of a numerically controlled lathe, which comprises the following steps: setting the initial speed of the main shaft, the speed increase value of each stage and the highest rotational speed according to the main parameters of the numerically controlled lathe; measuring the temperature of the main shaft bearing in real time, and At each level of speed, if the temperature rise exceeds the set temperature T1 per unit time, the control spindle will continue to run at this level of speed, otherwise the current speed will be raised to the next level of speed; repeat the above steps until the spindle reaches the maximum speed, When running at the highest speed, measure the temperature of the spindle bearing in real time. If the temperature rise exceeds the set temperature T2 per unit time, continue to run until the above temperature rise standard is met. At this time, the temperature rise of the spindle is qualified and the test is terminated. ; If the temperature of the spindle bearing exceeds 70°C or the temperature rise of the spindle bearing exceeds 35°C / h, the temperature rise of the spindle is judged to be unqualified and the test is terminated. The invention can avoid the extreme temperature and damage of the bearing, and effectively improve the assembly quality of the main shaft parts.

Description

technical field [0001] The invention belongs to the technical field of testing numerically controlled lathes, and in particular relates to a method for testing the temperature rise of the main shaft of numerically controlled lathes. Background technique [0002] At present, CNC lathes have been widely used in our country, laying a solid foundation for mechanized manufacturing and production in our country. Among them, the spindle is the core component of the CNC machine tool, so the requirements for the precision and rigidity of the spindle are very high. Generally speaking, the precision error and deformation of each part of the main shaft are very small, but when running at high speed, the bearing generates a lot of heat, which leads to a high temperature rise of the bearing and thermal deformation, and the error caused by thermal deformation is much larger than that of the bearing. Accuracy error and deformation, and thermal deformation directly changes the preload condi...

AI Technical Summary

Problems solved by technology

[0004] However, when testing according to the above-mentioned standards, since the time for the main shaft to run at low, medium and high speeds is relatively short, the relationship between the main shaft and the bearing has not reached sufficient stability before running to the highest speed, and the running time at the highest speed is longer, making the The temperature of the spindle bearing rises sharply at the highest speed, and it is easy to reach the limit temperature, which will cause damage to the bearing and further affect the assembly quality of the spindle components

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