4OM-1003-007.pdf - 第396页
Failures can further be classified as shown in the table below . T able 4B21 Classification of Failures Contents of Failures Symptom of Failures Failure before Component Component Pick-Up Components cannot be picked up. …
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5. Troubleshooting related to Component Pick and Placements
5. Troubleshooting related to Component Pick and
Placements
5.1 Classification of Failure Symptoms and Helpful
Hints on Countermeasures against Failure
5.1.1 Classification of Failure Symptoms
The turret movement can be classified into Processes A, B, C, D, and
E as shown below.
Refer to "1. Outline of Actions" in "Section 2" of the instruction manual
(Volume 2: Operation (Supervisor)) for the outline of actions.
Process A : A component is picked up at Station #12 and transferred
to Station #3.
Process B : The component recognition function is implemented on
the component at Station #3.
Process C : The placement angle is corrected at Station #3 and the
subsequent stations and the component is placed on the
P.C.B. at Station #6.
Process D : The component is placed on the P.C.B. along with the
movement of the X/Y table.
Process E : The component-placed P.C.B. is discharged.
Fig. 4B29
Based on these processes, failures can be divided roughly into the
following two types.
• Failure before Component Placement
This type of failure occurs mainly in Processes A, B, and C.
• Failure after Component Placement
This type of failure occurs mainly in Processed D and E.
Failures can further be classified as shown in the table below.
Table 4B21
Classification of Failures Contents of Failures Symptom of Failures
Failure before Component Component Pick-Up Components cannot be picked up.
Placement Error Components are turned vertically.
A recognition error occurs.
Components drop.
Others
Failure after Component Component Placement The positional or angular deviation
Placement Error of component occurs.
Components are turned over and
placed.
Some components are missing.
Some components are cracked or
nicked.
Others
5.1.2 Helpful Hints on Countermeasures against Failure
• The first helpful hint on countermeasures against failure is to catch
precisely what kind of symptom is produced and how frequently the
symptom appears.
• The second helpful hint is to grasp the tendency (environment and
condition) of a failure.
Shown below are the concrete items to be checked.
(1) Check if the failure occurs on specific components.
(2) Check if the failure occurs on a specific production lot.
(3) Check if the failure occurs on a specific machine.
(4) Check if the failure occurs at a limited stage.
• The third helpful hint is to find in which process the failure occurs.
In normal cases, a failure after component placement is found in
the final inspection process. In such a case, it is required to track
the failure by checking all processes and specify the process in
which the failure has occurred.
It is very important to grasp a failure symptom precisely on these
helpful hints. Precise capture of a failure symptom makes it pos-
sible to track the factor and make a plan to take countermeasures
against the failure. If a failure symptom is grasped negligently,
ineffectual countermeasures may be taken and it may take much
time before the proper countermeasures are determined.
Especially, as for less failures (low generation rate), it is necessary
to take data accurately, examine the factors as a result, and ex-
ecute measures against such failures.
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5.1 Classification of Failure Symptoms and Helpful Hints on Countermeasures against Failure
5.2 Troubleshooting on Pick-Up Errors
5.2.1 Cause and Remedy of Pick-Up Errors
(1) Component-Based Factors
When the cause of a failure lies in specific components or lots, the
components must be examined first of all.
Shown below are the cases of failures whose factors lie in compo-
nents.
[Factors of Pick-Up Errors on Component Side]
See Fig. 4B30.
(1-1) A component adheres to the bottom tape.
(1-2) The shape of a tape cavity is defective.
(1-3) The shape of a component is defective.
(1-4) A component turns sideways because the tape cavity is too large.
(1-5) The flatness of the cavity bottom is defective.
(1-6) Oil or mold lubricant adheres to the bottom of a component.
The failures described in "(1-1) through (1-4)" have a tendency to oc-
cur easily due to the components packaged in a paper tape and the
failures described in "(1-4) through (1-6)" due to the components pack-
aged in a plastic tape.
Special caution should be paid to minute components such as 0603
and 1005 types because such components are directly affected by how
they are packaged in the tape.
To determine whether or not the taped components are packaged in
good condition with the top cover tape peeled off, turn the tape upside
down and check to see how the components fall down from the cavi-
ties. If the components fall down freely, it means that they were pack-
aged in good condition.
The specifications of taping are established in "JIS-C0806". However,
as the detailed regulations on the above-described "(1-1) through (1-
6)" are not provided, it is required to ask the component maker about
the details when the components are purchased.
Fig. 4B30 Exemplification of Troubled Taped Components
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5.2 Troubleshooting on Pick-Up Errors