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Interface for five axis machining center profile wheel machining accuracy how to control
by：Transon
2020-10-27
1, the acceleration control before interpolation function and speed feedforward control channel.
Five axis machining center machine tool is characterized by profile wheel machining precision is high.
In high speed and high precision surface processing, the acceleration control before interpolation function is very important, and the acceleration control before interpolation function, can be used in the feed shaft speed loop gain, high speed system control accuracy is greatly improved;
Especially for B and C axis (
A and C pendulum shaft)
It is hoped for.
five axis machining center acceleration control before interpolation function and speed feedforward control channel can be used at the same time, to pay attention to three points is that after the first interpolation of acceleration is not too high; Second paragraph conversion between speed cannot too fast; Three processing profile wheel curvature changed little. In the forward control mode ( 看- - - - - - 提前controlmode) Acceleration control before interpolation function in the main role is to reduce the vibration, because look forward function optimization factor is the contour machining precision and machining time. Some CNC system is equipped with a dedicated look forward function interpolation in the former acceleration parameters, such as FANUC, etc. Must also consider that the execution time of the minimum the procedures section, there is plenty of pretreatment time follow-up procedure, to ensure continuity procedures section conversion speed.
2, processing process control type selection. With the emergence of five-axis control function, five-axis linkage ( Mainly refers to the five axis interpolation) Beyond the meaning of feed shaft interpolation. C and B axis ( Or A shaft) , according to the type of machine tool set to machine tool orientation axis ( 媒体服务器) , C axis to the axis and the cutting tool axis to B axis geometry are appear as dynamic compensation interpolation operation cycle, reducing C and B axis rotation axis C and axis B, cutter axis and B axis intersection, or mechanical error caused by the orthogonal, raised the profile of five-axis linkage machining precision, this is the past five axis machining center. For example: G1G91X1. 605 y - 0. 727Z - 0. 671 b1。 100C - 1. 362 f10000 a processing program.
undefined RTCP five axis control, CNC interpolation arithmetic unit of X, Y, Z, C, and B axial feeding, acceleration and velocity at the same time distribution, X, Y, and Z programming trajectory, the processing of C and B axis rotation directly change the tip position. Work coordinates according to the C axis and shaft axis, cutting tool axis and shaft axis intersection B definition, there is no axis geometry size of dynamic compensation, mechanical processing in error. Define RTCP after five axis control, C and B axis rotation and processing locus decoupling, X, Y, and Z trajectory is not only the processing trajectory programming, C and B
just change the direction of cutter axis rotation axis. Axis after the geometry size of dynamic compensation, work coordinate is be redressed, eliminates the mechanical error.
in high speed machining, five axis machining center for high contour precision, according to the characteristics of the selected control function, if USES the acceleration control before interpolation function or contour accuracy control functions, to evaluate the processing from the above three elements. In selection of shape and precision of the machined part contour control function, and the need for system optimization. Processing mould parts and structure features, profile control function is different. Contour accuracy, the higher the more factors involved, such as interpolation cycle time, position loop sampling time, the position loop gain and dynamic matching position loop and speed loop integral gain parameters must be considered and adjustment, in order to realize the numerical control machine is high, the essence of running.
five axis machining center acceleration control before interpolation function and speed feedforward control channel can be used at the same time, to pay attention to three points is that after the first interpolation of acceleration is not too high; Second paragraph conversion between speed cannot too fast; Three processing profile wheel curvature changed little. In the forward control mode ( 看- - - - - - 提前controlmode) Acceleration control before interpolation function in the main role is to reduce the vibration, because look forward function optimization factor is the contour machining precision and machining time. Some CNC system is equipped with a dedicated look forward function interpolation in the former acceleration parameters, such as FANUC, etc. Must also consider that the execution time of the minimum the procedures section, there is plenty of pretreatment time follow-up procedure, to ensure continuity procedures section conversion speed.
2, processing process control type selection. With the emergence of five-axis control function, five-axis linkage ( Mainly refers to the five axis interpolation) Beyond the meaning of feed shaft interpolation. C and B axis ( Or A shaft) , according to the type of machine tool set to machine tool orientation axis ( 媒体服务器) , C axis to the axis and the cutting tool axis to B axis geometry are appear as dynamic compensation interpolation operation cycle, reducing C and B axis rotation axis C and axis B, cutter axis and B axis intersection, or mechanical error caused by the orthogonal, raised the profile of five-axis linkage machining precision, this is the past five axis machining center. For example: G1G91X1. 605 y - 0. 727Z - 0. 671 b1。 100C - 1. 362 f10000 a processing program.
undefined RTCP five axis control, CNC interpolation arithmetic unit of X, Y, Z, C, and B axial feeding, acceleration and velocity at the same time distribution, X, Y, and Z programming trajectory, the processing of C and B axis rotation directly change the tip position. Work coordinates according to the C axis and shaft axis, cutting tool axis and shaft axis intersection B definition, there is no axis geometry size of dynamic compensation, mechanical processing in error. Define RTCP after five axis control, C and B axis rotation and processing locus decoupling, X, Y, and Z trajectory is not only the processing trajectory programming, C and B
just change the direction of cutter axis rotation axis. Axis after the geometry size of dynamic compensation, work coordinate is be redressed, eliminates the mechanical error.
in high speed machining, five axis machining center for high contour precision, according to the characteristics of the selected control function, if USES the acceleration control before interpolation function or contour accuracy control functions, to evaluate the processing from the above three elements. In selection of shape and precision of the machined part contour control function, and the need for system optimization. Processing mould parts and structure features, profile control function is different. Contour accuracy, the higher the more factors involved, such as interpolation cycle time, position loop sampling time, the position loop gain and dynamic matching position loop and speed loop integral gain parameters must be considered and adjustment, in order to realize the numerical control machine is high, the essence of running.
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