CP43操作手册.pdf.pdf - 第87页
Chapter 1 Automatic Operation Part 2 1.12 Compensation When Placing Parts A total of 36 nozzles can be fitted onto the FCP IV -3. Each nozzle's center of rotation is usually slightly of f center . There ar e also pr…
Chapter 1 Automatic OperationPart 2
1.10Parts Rotation: (Pθ: Pre-theta, Fθ: Fine theta)
On the FCP IV-3, parts are rotated in two stages: the Pθ and Fθ. When
large parts are rotated fast, there can be slippage between the part and the
nozzle. To minimize this slippage, these parts are rotated in two stages.
The stages are explained below.
(1) At Station 2, the machine determines from the program whether to
rotate 90˚, -90˚ or not at all.
(2) At Station 3, the rotation is actually done, finishing the pre-theta stage.
(3) At Station 4, the part is inspected by the parts camera.
(4) At Station 6, the results of vision processing are used to rotate the
nozzle, fine-tuning the rotation done in the pre-theta stage. This is the
fine theta stage.
(5) At Station 7 the part is placed.
1.11 Compensation When Picking Parts
In order to continually be able to pick parts at the center of each part, the
FCP IV-3 compiles statistics on how far off center in the X direction parts
are being picked. This information is then used to correct the pickup
position of parts subsequently picked from the same device position. The
three types of compensation are described below.
• Automatic Offset
The results of vision processing are processed statistically and the
pickup point is changed accordingly. When a program is corrected
from the MCS 30 computer or the [CHANGE] command is used to
change the program the offset value will be completely cleared.
This value is calculated automatically inside the machine and the user
cannot change it.
• Device Offset in Proper data (Device Offset 1 ~ 160)
If automatic offset is not functioning efficiently after a program has
been changed, such that pickup from a specified device number is not
possible, then Device Offset in Proper data can be set to allow pickup.
Moreover, once Device Offset has been set so that pickup is possible,
then the automatic offset operates to calculate the center of the part.
• Parts Picking Offset in Part data
When a part cannot be picked because of its shape, an offset can be
specified in Part data to allow pickup. Moreover, after the offset part
is set so that it can be picked, the automatic offset operates to calculate
the center of the part.
2 – 18Version 2.0
FCP IV-3 Operation
Chapter 1 Automatic OperationPart 2
1.12 Compensation When Placing Parts
A total of 36 nozzles can be fitted onto the FCP IV-3. Each nozzle's center
of rotation is usually slightly off center. There are also problems with
slippage of the part. This deviation is compensated for during placing.
• Nozzle X Offset
Movement of the nozzle center in the X direction during rotation is
compensated.
• Nozzle Y Offset
Movement of the nozzle center in the Y direction during rotation is
compensated.
• Nozzle Proper data X (SA Place Offset X ~ LL Place Offset X)
Deviation of the X coordinate placing point is compensated in the
machine.
• Nozzle Proper data Y (SA Place Offset Y ~ LL Place Offset Y)
Deviation of the Y coordinate placing point is compensated in the
machine.
Note: Refer to Part 3, Section 3 for command page information concerning
nozzle center measurement.
2 – 19Version 2.0
FCP IV-3 Operation
Chapter 1 Automatic OperationPart 2
1.13 Turnover Production
In certain sequences, the parts on the device table are arranged so that
after a certain board is finished, the device table for the next board has to
move a long distance before starting on the next board (Ex.: from D160 to
D1). In this case, in order to minimize the time spent waiting for the
board to change, the placing sequence can be read from front to back, and
then from back to front, switching each time a new board is loaded. This
means time is not lost waiting for the device table to return to its original
position every time a new board is loaded. This is called "turnover."
During turnover production, the sequence order is reversed every second
board, but the fiducial and block skip marks are always read before
placing.
When setting or cancelling turnover production, pressing the [SET],
[STATUS] and [TURNOVER] command function keys in that order will
alternately set or cancel production. Depending on the direction of the
sequence, either “Normal Turnover” or “Reverse Turnover” will be
displayed.
Note: After turnover is cancelled the sequence will execute in correct order.
Therefore, be careful not to cancel the turnover mode while the sequence
is operating in reverse order.
1.14 Changing Table Acceleration
There is little meaning in placing parts accurately if they are thrown out of
position by subsequent table movement. When the operator has a
problem with parts slipping on the board, the acceleration of the table can
be reduced. When "Table Speed" in Part data is set to “Low,” the
acceleration rate of the table will be lowered, and the parts on the board
will not be subjected to such rapid inertial changes.
Even though the acceleration rate of the table is lowered during
placement of parts, some parts may fall down or slip out of position while
the board is returning to the loading position.
Using "Machine Status B" in Proper data, it is possible to lower the
acceleration rate of the table after production of one board is completed
until the next board is fed to the placement position. This mode will be
valid for all boards, thereby lengthening the throughput time per board.
If possible, this mode may be turned off to improve efficiency.
Refer to Part 4, Chapter 2, Details of Proper Data for Proper data settings.
2 – 20Version 5.0
FCP IV-3 Operation