Five-shaft linkage numerical control machining center

Abstract

The invention discloses a five-axle linkage digital-control processing centre which comprises a lathe bed (10) and a portal frame (30), wherein the portal frame (30) comprises a left portal upright post (32), a right portal upright post (32) and a fixing portal crossbeam (35), and the front part of each portal upright post (32) is provided with a direct driving type double-shaft precise rotating table (20) which enables a working table (26) to simultaneously rotate round an A shaft and a C shaft. Furthermore, the portal frame (30) is provided with a crossbeam (40) which can move along the Y direction, the front part of the crossbeam (40) is provided with a slide carriage (50) which can move along the X direction, the front part of the slide carriage (50) is provided with a main shaft box (60) which can move along the Z direction, the main shaft box (60) is provided with a main shaft installing hole (66) used for installing a main shaft (70), and a tool magazine (80) is arranged in a cavity positioned between the lathe bed (10) and the portal frame (30). The invention has novel structure, small occupied area, space saving, low cost and stable operation and property. Besides, a motion shaft of a machine tool has high dynamic property, regulating property, positioning precision and repeated positioning precision.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tools, in particular to a five-axis linkage numerical control machining center. Background technique [0002] In the prior art, there are already many types of CNC machining centers, but there are still many shortcomings. They are generally suitable for machining shaft parts and box parts, but not suitable for impeller parts. Moreover, most of them occupy a large area and the utilization rate of machine tools is not high. [0003] (1) From the analysis of the main structure of the CNC machining center, there are many types of traditional gantry structures. The workbench is the X-axis, which moves back and forth under the gantry frame. The size and weight of the workbench and the workpiece are large. The disadvantage of this type of structure is that the machine tool occupies a large area, the X-axis load is large, it is difficult to achieve high-speed movement, and the rigidity ...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, there are many types of CNC machining centers, but there are still many shortcomings. Generally, they are suitable for machining shaft parts and box parts, but not suitable for impeller parts.

Moreover, most of them occupy a large area and the utilization rate of machine tools is not high

[0003] (1) From the analysis of the main structure of the CNC machining center, there are many types of traditional gantry structures. The workbench is the X-axis, which moves back and forth under the gantry frame. The size and weight of the workbench and the workpiece are large. The disadvantage of this type of structure is that the machine tool occupies a large area, the X-axis load is large, it is difficult to achieve high-speed movement, and the rigidity of the gantry is relatively poor

Another type of gantry structure, not only the beam moves, but also the column moves with the model. Generally, two screws and two drive motors are required under the X-axis, but when the screw is driven, the screw nut will exert torque on the screw. In addition, if the length of the lead screw is too long, it will cause shaking, which will affect the shape and dimensional accuracy of the cutting workpiece, and when it is used for a long time or contaminated by foreign matter, the pitch and straightness of the lead screw will be affected by wear and tear, and there will be considerable error backlash The increase of the value will cause the increase of the shape or size error of the cutting workpiece, the cost is high, and the rigidity and stability are not easy to guarantee; at the same time, due to the high gantry frame, the movement speed is difficult to increase, and the cutting force is relatively small, so that the impact of vibration on the machine tool is small. larger

[0004] (2) The traditional CNC turntable is mostly driven by a worm gear through a servo motor. The worm gear transmission has precision but no power, power but no precision, and the backlash cannot be overcome

Mainly manifested in: ① Due to the large gap in the transmission chain and the friction of the worm gear, the wear is relatively large, which greatly affects the rotation speed and transmission accuracy

②The transmission efficiency of worm gear is low, and the rotation speed is greatly limited, usually below 3000rpm

③ Due to the long transmission path of worm gear transmission, the elastic deformation will also affect the transmission accuracy

When the degree is slight, the vibration is large, the noise is large, the precision of the parts is reduced, and the surface is rough; in severe cases, the system will still make mistakes, and the frequency of failures is high. Because of asynchronous wear and uneven thermal deformation, failures occur every time will appear repeatedly, which brings many difficulties to practical application

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