Chip mounter X-Y axis is an important reference point in the production of the mounting process, we use the chip mounter positioning system, according to the lens on the mounter X-Y axis to absorb and mount the response to accurately make judgments and identification, mounter X-Y axis specifically what are the characteristics and role of it?
I. The structure of chip mounter X-Y axis
In the X / Y-axis guideway to perform X-Y two-dimensional movement. There are stepper motors and other servo motor drives. They all should go well. State characteristics and positional accuracy, the bearing motion part of the guideway is the key part of the motion guiding accuracy. At present, most of the finely engraved ball linear guide, this guide has a small coefficient of friction, high precision, long life, easy to install and maintain, easy to standardize the production of commonly used linear bearing guide cross-section shapes are also varied. There are also large-span double-screw beam structure form of organization, as well as single-shoulder dual-rail type. When we install chip mounter guide rail, make sure that the two rails are parallel in space and keep the horizontal working surface.
II. The role of chip mounter X-Y axis
The parameters that drive the X/Y two-dimensional motion components are also key to the accuracy of chip mounter.
If the chip mounter's chip head has a linear moving speed of 1 m/s the ball screw has a lead of 20 mm, so when the chip head moves 1 meter, the screw needs to rotate 50 times, the servo motor 's speed reaches 3,000 rpm, and 4,000 pulses are generated per revolution if the feedback code disk for the fat-feeding motor occupies 4,000 lines.
For a 20 mm screw then, the displacement of each pulse is 5 mm, and under the condition of 3000 rpm, the output frequency of the feedback pulse must reach 200 khz. this work is actually a group sampling data control system. It is directly controlled by the computer of the mounter, which is responsible for the reception of displacement parameter commands and the acquisition of bits. Setting the feedback signal from the sensor, the computer controls the function and generates the control signal in digital form. Digital after D / A conversion and servo amplification, by the actuator to drive the digital form of the control signal, drive the output axis on the positioning head.
Tracking components PCB on the position of the command movement, the formation of digital closed-loop control system. System control design requires a reasonable set of structural devices and the corresponding transmission components.
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