High-precision fixed beam type digital control plane milling and boring machine

Abstract

The invention relates to a fixed beam type digital control plane milling and boring machine, which mainly comprises a machine body, a work table, upright posts, cross beams, a tool carriage, an ram, an X-axis guide rail, a drive system of the X-axis guide rail, a Y-axis guide rail, a drive system of the Y-axis guide rail, a Z-axis guide rail and a drive system of the Z-axis guide rail, wherein a set of slide pair which is parallel to a rectilinearly rolling guide rail pair is arranged on the basis of the prior two heavy-load roller rectilinear guide rails of a Y-axis. The invention utilizes the principle of over-positioning 'common load' of composite guide rails, and adopts an adjustable plastically stuck oblique gib to adjust the load of the slide pair, thereby driving the slide pair to have proper dynamic and static friction ratio. Simultaneously, different preloads applied on the plastically stuck surface of the slide pair by the oblique gib can generate different damping effects. Therefore, the bearing capacity and the cutting vibration resistance of the machine tool are improved and the precision and the precision stability of the machine tool are greatly improved.

Description

Technical field: [0001] The invention relates to the technical field of large-scale mechanical processing equipment, in particular to a fixed-beam numerical control gantry boring and milling machine. Background technique: [0002] Fixed beam CNC gantry boring and milling machine, mainly composed of bed, worktable, left and right columns, beam, slide plate, ram, main gearbox, console, electrical control box, hydraulic control box and X-axis, Y-axis and Z-axis guide rails and its drive control device. After the part is clamped once, it can automatically complete multi-process processing such as milling, drilling, reaming and boring, which is suitable for rough and fine machining of large and medium-sized parts in various industries. [0003] Because the X-axis, Y-axis and Z-axis guide rails and their drive control devices directly affect target positioning and machining accuracy. In existing machine tools, there are mainly the following disadvantages: [0004] 1. There are ...

AI Technical Summary

Problems solved by technology

The backlash-free elastic coupling deforms during heavy cutting, which causes axial movement of the X-axis and affects machining accuracy

[0006] 3. The connection between the output shaft of the main gearbox and the main shaft is connected by a spline. There is a backlash between the spline and the main shaft, and between the spline and the output shaft of the gear box, which greatly reduces the output torque. At the same time, the two ends of the ram are The coaxiality requirement of the hole is relatively high, which increases the processing difficulty of the ram

If the backlash control is not good, the machine tool will vibrate when it is cutting strongly

[0007] 4. During the operation and processing of the machine tool, it is necessary to carry out automatic intermittent oil lubrication for each mechanical operation system. The existing lubrication method adopts thin oil lubrication, which is implemented by an automatic gas station, that is, an oil pump. However, due to various reasons, the oil circuit leaks Lack of oil or lack of pressure at high places often occurs. The discovery of existing lubricating oil circuit faults relies on manual regular or irregular inspections. Therefore, the discovery and elimination of faults has a lag

If the fault is not detected and eliminated in time, the mechanical operation system will lack oil lubrication, which will directly affect the machining accuracy, and in severe cases, the parts will be overheated and scrapped

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