X-C direct driven grinding profile error non-linear coupling control system and method

Abstract

The invention relates to the technical field of numerical control machining and control and provides an X-C direct driven grinding profile error non-linear coupling control system and method. The system comprises a CNC interpolator, an X axis motor control unit, an X axis motor driving unit, an X axis linear motor and an X axis linear grating which are sequentially coupled, a C axis motor control unit, a C axis motor driving unit, a C axis moment motor and a C axis round grating which are sequentially coupled as well as a non-linear coupling controller; the non-linear coupling unit obtains the tracking error of each axis according to the command position and the fed position result of each axis, a profile error is obtained after coupling calculation, and then a compensation quantity is distributed to each axis motor driving unit according to the coupling gain of each axis. The profile error can be fast calculated according to the machining features in the X-C grinding machining of a planar curved profile part, a compensation coefficient can be provided and the profile machining precision of the X-C direct driven flat grinding table is effectively improved.

Description

technical field [0001] The invention relates to the technical field of numerical control machining control, in particular to an X-C direct drive grinding profile error nonlinear coupling control system and method. Background technique [0002] Plane curve rotary parts such as cams, elliptical pistons, rotor engine combustion chambers, etc. require high profile precision. The grinding of these parts generally adopts X and C two-axis simultaneous machining in the prior art. The direct drive motor cancels the intermediate transmission and has the characteristics of high speed and high precision. X-C direct drive grinding processing platform is composed of linear motor and torque motor. The processing object is generally a plane curve rotary part, and the cutting tool is a grinding wheel. Among them, the X-axis is driven by a linear motor to move the wheelhead horizontally, the C-axis is driven by a torque motor to rotate the workpiece, and the X-axis and C-axis are linked to c...

AI Technical Summary

Problems solved by technology

Some researchers have adopted advanced control methods such as equivalent error and repetitive tracking control to design coupling controllers to improve the responsiveness of the controller. These methods are complex in calculation process and slow in response, and are not suitable for use in CNC systems.

[0004] The above studies are all based on the premise that the deviation of the machining coordinate track is equal to the deviation of the workpiece profile. In the grinding process of tangent point tracking of the curve profile, due to factors such as the profile feature and the radius of the grinding wheel, the machining coordinate is the center track of the grinding wheel, which is not the true cutting point. Contact, machining coordinate error is not directly equivalent to profile error

Moreover, most of the research content focuses on the contour error control of the X-Y machining platform, and there are few related studies on the coupling control of the X-C machining platform; because the error formation of the X-C machining platform is quite different from that of the X-Y platform, the control methods of the existing technology are very important for improving the profile of the X-C machining platform. Shape error has limited effect

Images