Coating method and coating device with compensation for asymmetries of the spray jet
The invention relates to a coating method for coating a component surface ( 4 ) with a coating agent, in particular for painting a motor vehicle body component with a paint, having the following steps: ⋅ emitting a spray jet ( 1 ) of the coating agent onto the component surface ( 4 ) of the component to be coated by means of an atomizer ( 2 ), said spray jet ( 1 ) having a main axis ( 5 ) and having an asymmetry with respect to the main axis ( 5 ) such that the spray jet ( 1 ) generates a spray pattern with a corresponding asymmetry on the component surface ( 4 ), and ⋅ at least partially compensating for the asymmetry of the spray jet ( 1 ) such that the asymmetry of the resulting spray pattern on the component surface ( 4 ) is reduced. The invention further relates to a corresponding coating device.
1. A coating device for coating a component surface with a coating agent, comprising:
an atomizer configured to dispense a spray jet of a coating agent onto the component surface, such that the spray jet, when dispensed, has a main axis and an asymmetry with respect to the main axis, whereby the spray jet on the component surface generates a spray pattern with a corresponding asymmetry; the atomizer being operated with different disturbance variables includes a movement speed and a variable guide air speed; and
a compensation device that receives as input values the disturbance variable and configured to at least partially compensate for the asymmetry of the spray jet, whereby the asymmetry of the spray pattern is reduced.
2. The coating device of claim 1 , further comprising:
a manipulator to move the atomizer; and
a control unit to control the manipulator;
wherein the control unit is configured to control the manipulator such that the atomizer is angled with respect to the surface normal of the component surface, whereby the spray jet hits with its main axis slanted with respect to the component surface.
3. The coating device of claim 2 , wherein:
the control unit is configured to control the manipulator such that the atomizer is moved in a predetermined painting direction along the component surface to apply to the component surface an elongated painting path along the painting direction; and
the control unit is configured to control the manipulator in a manner that the spray jet is angled with its main axis transverse to the painting direction, thereby at least partially compensating for the asymmetry of the spray jet.
4. The coating device of claim 2 , wherein:
the device is configured to dispense the spray jet such that the spray jet is deformed in a deformation direction transverse with respect to the main axis of the spray jet, such that the resulting spray pattern on the component surface is stretched in the deformation direction and compressed against the deformation direction; and
the control unit is configured to control the manipulator such that the atomizer is angled against the deformation direction to at least partially compensate for the asymmetry of the spray jet.
5. The coating device of claim 2 , wherein the manipulator is a multi-axis painting robot.
6. The coating device of claim 2 , wherein the manipulator is a painting machine.
7. The coating device of claim 2 wherein the compensation device calculates an extent of the deformation of the spray jet.
8. The coating device of claim 7 wherein the spray jet compensation device calculates an angle which the atomizer must be angled with respect to the component surface in order to compensate for the asymmetries of the spray jet.