Load-deformation curve-based ball screw pair maximum axial load measuring method
A ball screw pair, axial load technology, applied in the direction of measuring devices, testing of mechanical components, testing of machine/structural components, etc., can solve the deviation between the theoretical value and the actual value of the maximum axial load, screw deformation, ball Problems such as the geometric error of the screw pair to achieve the effect of improving accuracy
Active Publication Date: 2019-08-20
NANJING UNIV OF SCI & TECH
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Problems solved by technology
[0003] Through consulting relevant documents, due to the closed internal space of the double-nut ball screw pair after assembly and debugging, it is impossible to obtain the internal contact conditions, and it is very difficult to measure the maximum axial load of the ball screw pair. At present, no effective measurement has been formed at home and abroad. method
The existing calculations about the maximum axial load are based on theoretical analysis, but there are geometric errors in the ball screw pair during processing, and the screw, nut raceway and other elastic components will also be deformed after loading, which will make the maximum axial load There is a large deviation between the theoretical value and the actual value of the load
Method used
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Embodiment
[0033] In this embodiment, the method of the present invention is used to measure the maximum axial load of a 40-10 type double nut washer preloaded ball screw pair with a length of 740 mm. The main parameters of the double-nut washer pre-tightened ball screw pair are shown in Table 1 below:
[0034] Table 1 Main parameters of double nut gasket preloaded ball screw pair
[0035] parameter value Ball radius r b (mm)
3.175 screw radius r m (mm)
20 contact angle α 0 (o)
45 Friction coefficient μ 0.0045
[0036] The method for measuring the maximum axial load of the ball screw pair based on the load deformation curve of the present invention is used for measurement, including the following:
[0037] 1. Install the ball screw pair in the friction torque measurement system, the average value of the measured friction torque is 2.83Nm, and the pre-tightening force F is calculated by the formula P :
[0038]
[0039] 2. Disassem...
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The invention discloses a single nut load-deformation curve-based double-ball screw pair maximum axial load measuring method. According to the method, the friction torque of a to-be-measured double-nut ball screw pair is measured, and the pre-tightening force FP of the double-nut ball screw pair is calculated according to the friction torque; the auxiliary nut of the double-nut ball screw pair isremoved, and an axial loading test system is used for measuring the actual load-deformation curve of the main nut of the double-nut ball screw pair; the main nut and auxiliary nut are assembled again,and the previous pre-tightening force is restored; and the measured load-deformation curve is analyzed, deformation corresponding a condition that an axial load is the pre-tightening force FP is setto be delta, therefore, a load corresponding to 2delta, is the maximum axial load of the double-nut ball screw pair. With the method adopted, the maximum axial load of the double-nut ball screw pair can be measured; and since measurement results consider influence brought by rolling path geometric error, a thread screw deformation quantity, and the deformation quantity of elastic elements such asa gasket, the measurement results are accurate.
Description
technical field [0001] The invention belongs to the field of performance testing of a ball screw pair, in particular to a method for measuring the maximum axial load of a double nut ball screw pair based on a single nut loaded deformation curve. Background technique [0002] The ball screw pair is the core functional part of the CNC machine tool. Its accuracy retention time determines the reliable service life of the machine tool, and the pretightening force of the ball screw pair has a great influence on its accuracy retention time. When the axial load on the double-nut ball screw pair reaches the maximum axial load, the raceway of the nut at one end of the ball screw pair will be disengaged from the balls. At this time, the unloading state is reached, and all the loads are borne by the nut at the other end. . The contact between the ball and the raceway in the unloaded state is in an extremely unstable state, and the ball screw pair will produce a backlash, the positionin...
Claims
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IPC IPC(8): G01M13/025
CPCG01M13/025
Inventor 周长光王凯张鲁超聂从辉冯虎田欧屹
Owner NANJING UNIV OF SCI & TECH