High-precision and fast driving mechanism of vertical axis of CNC machine tool

Abstract

The invention relates to a high-precision fast driving mechanism for the vertical axis of a numerical control machine tool, comprising a slide plate and a ram, the ram slides vertically along the outer surface of the slide plate, the bottom of the ram is connected with a tool, and symmetrically arranged on the left and right sides of the ram The linear guide rail is slidingly connected with the slide plate; the upper support seat of the screw is symmetrically arranged on the left and right sides of the top of the ram, the lower support seat of the screw is arranged symmetrically on the left and right sides of the middle of the ram, and the upper support seat of the screw on the same side Leading screws are connected with the lower supporting base of the leading screw, and a direct drive motor is coaxially matched on each leading screw, and the motor base of the direct drive motor is connected on the slide plate. The high-precision fast drive mechanism avoids the transmission gap generated by gear drive, ensures the high precision and dynamic response speed of the transmission chain, and is easy to realize large-stroke high-precision drive.

Description

technical field [0001] The invention relates to a high-precision fast driving mechanism for a vertical axis of a numerical control machine tool, belonging to the technical field of numerical control machine tool manufacturing. Background technique [0002] With the continuous development of science and technology, the requirements for large-scale high-precision bridge-type five-axis CNC machine tools in the fields of aerospace, rail transit, and military industry are also increasing. The latest requirement for high-end large-scale high-precision five-axis machine tools is to have the characteristics of high precision and high dynamic characteristics. The main equipment used in the shaping and processing of large parts in the aviation industry is a high-precision bridge-type five-axis machine tool. Usually, the vertical axis stroke is required to be greater than 2m. Repeat The positioning accuracy is less than 3 microns. The spindle box of the existing large-scale gantry five...

AI Technical Summary

Problems solved by technology

The latest requirement for high-end large-scale high-precision five-axis machine tools is to have the characteristics of high precision and high dynamic characteristics. The main equipment used in the shaping and processing of large parts in the aviation industry is a high-precision bridge-type five-axis machine tool. Usually, the vertical axis stroke is required to be greater than 2m. Repeat The positioning accuracy is less than 3 microns. The spindle box of the existing large-scale gantry five-axis machine tool mostly uses the motor to connect the screw to drive the ram to move, and the balance oil cylinder to balance the gravity of the ram. This structure has a large backlash due to the long transmission chain. The transmission chain has problems such as large thermal deformation error, and the fluctuation resistance of the balance cylinder is relatively large when moving, so the repeated positioning accuracy of the ram shaft is too poor and the dynamic performance is slightly insufficient, which cannot meet the needs of high-precision and high-dynamic response of the equipment

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