High-precision rapid driving mechanism for vertical shaft of numerical control machine tool

Abstract

The invention relates to a high-precision rapid driving mechanism comprises a sliding plate and a ram, the ram vertically slides along the outer surface of the sliding plate, the bottom of the ram is connected with a tool, linear guide rails are symmetrically arranged on the left side and the right side of the ram, and the linear guide rails are in sliding connection with the sliding plate; and lead screw upper supporting seats are symmetrically arranged on the left side and the right side of the top of the ram, lead screw lower supporting seats are symmetrically arranged on the left side and the right side of the middle of the ram, lead screws are connected between the lead screw upper supporting seats and the lead screw lower supporting seats on the same side, each lead screw is coaxially matched with a direct drive motor, and motor seats of the direct drive motors are connected to the sliding plate. According to the high-precision rapid driving mechanism, a transmission gap generated by gear driving is avoided, the high precision and the dynamic response speed of a transmission chain are guaranteed, and large-stroke high-precision driving is easy to achieve.

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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